Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

41 files changed, 13735 insertions, 0 deletions

diff --git a/cppu/source/AffineBridge/AffineBridge.cxx b/cppu/source/AffineBridge/AffineBridge.cxx
new file mode 100644
index 000000000..3e2b01df1
--- /dev/null
+++ b/cppu/source/AffineBridge/AffineBridge.cxx
@@ -0,0 +1,360 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <osl/thread.hxx>
+#include <osl/conditn.hxx>
+#include <osl/mutex.hxx>
+#include <osl/diagnose.h>
+#include <sal/log.hxx>
+
+#include <cppu/Enterable.hxx>
+#include <cppu/helper/purpenv/Environment.hxx>
+#include <cppu/helper/purpenv/Mapping.hxx>
+#include <memory>
+
+namespace {
+
+class InnerThread;
+class OuterThread;
+
+class AffineBridge : public cppu::Enterable
+{
+public:
+    enum Msg
+    {
+        CB_DONE,
+        CB_FPOINTER
+    };
+
+    Msg                   m_message;
+    uno_EnvCallee       * m_pCallee;
+    va_list             * m_pParam;
+
+    osl::Mutex            m_innerMutex;
+    oslThreadIdentifier   m_innerThreadId;
+    std::unique_ptr<InnerThread> m_pInnerThread;
+    osl::Condition        m_innerCondition;
+    sal_Int32             m_enterCount;
+
+    osl::Mutex            m_outerMutex;
+    oslThreadIdentifier   m_outerThreadId;
+    osl::Condition        m_outerCondition;
+    std::unique_ptr<OuterThread> m_pOuterThread;
+
+    explicit  AffineBridge();
+    virtual  ~AffineBridge() override;
+
+    virtual void  v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam) override;
+    virtual void  v_callOut_v (uno_EnvCallee * pCallee, va_list * pParam) override;
+
+    virtual void  v_enter() override;
+    virtual void  v_leave() override;
+
+    virtual bool v_isValid(OUString * pReason) override;
+
+    void innerDispatch();
+    void outerDispatch(bool loop);
+};
+
+class InnerThread : public osl::Thread
+{
+    virtual void SAL_CALL run() override;
+
+    AffineBridge * m_pAffineBridge;
+
+public:
+    explicit InnerThread(AffineBridge * threadEnvironment)
+        : m_pAffineBridge(threadEnvironment)
+        {
+            create();
+        }
+};
+
+}
+
+void InnerThread::run()
+{
+    osl_setThreadName("UNO AffineBridge InnerThread");
+
+    m_pAffineBridge->enter();
+    m_pAffineBridge->innerDispatch();
+    m_pAffineBridge->leave();
+}
+
+namespace {
+
+class OuterThread : public osl::Thread
+{
+    virtual void SAL_CALL run() override;
+
+    AffineBridge * m_pAffineBridge;
+
+public:
+    explicit OuterThread(AffineBridge * threadEnvironment);
+};
+
+}
+
+OuterThread::OuterThread(AffineBridge * threadEnvironment)
+    : m_pAffineBridge(threadEnvironment)
+{
+    create();
+}
+
+void OuterThread::run()
+{
+    osl_setThreadName("UNO AffineBridge OuterThread");
+
+    osl::MutexGuard guard(m_pAffineBridge->m_outerMutex);
+
+    m_pAffineBridge->m_outerThreadId = getIdentifier();
+    m_pAffineBridge->outerDispatch(false);
+    m_pAffineBridge->m_outerThreadId = 0;
+
+    m_pAffineBridge->m_pOuterThread = nullptr;
+    m_pAffineBridge = nullptr;
+}
+
+
+AffineBridge::AffineBridge()
+    : m_message      (CB_DONE),
+      m_pCallee      (nullptr),
+      m_pParam       (nullptr),
+      m_innerThreadId(0),
+      m_enterCount   (0),
+      m_outerThreadId(0)
+{
+    SAL_INFO("cppu.affinebridge", "LIFE: AffineBridge::AffineBridge(uno_Environment * pEnv) -> " << this);
+}
+
+AffineBridge::~AffineBridge()
+{
+    SAL_INFO("cppu.affinebridge", "LIFE: AffineBridge::~AffineBridge() -> " << this);
+
+    if (m_pInnerThread && osl::Thread::getCurrentIdentifier() != m_innerThreadId)
+    {
+        m_message = CB_DONE;
+        m_innerCondition.set();
+
+        m_pInnerThread->join();
+    }
+
+    m_pInnerThread.reset();
+
+    if (m_pOuterThread)
+    {
+        m_pOuterThread->join();
+    }
+}
+
+
+void AffineBridge::outerDispatch(bool loop)
+{
+    OSL_ASSERT(m_outerThreadId == osl::Thread::getCurrentIdentifier());
+    OSL_ASSERT(m_innerThreadId != m_outerThreadId);
+
+    Msg mm;
+
+    do
+    {
+        // FIXME: created outer thread must not wait
+        // in case of no message
+        // note: no message can happen in case newly created
+        // outer thread acquire outerMutex after a real outer
+        // thread enters outerDispatch!
+        m_outerCondition.wait();
+        m_outerCondition.reset();
+
+        mm = m_message;
+
+        switch(mm)
+        {
+        case CB_DONE:
+            break;
+
+        case CB_FPOINTER:
+        {
+            m_pCallee(m_pParam);
+
+            m_message = CB_DONE;
+            m_innerCondition.set();
+            break;
+        }
+        default:
+            abort();
+        }
+    }
+    while(mm != CB_DONE && loop);
+}
+
+void AffineBridge::innerDispatch()
+{
+    OSL_ASSERT(m_innerThreadId == osl::Thread::getCurrentIdentifier());
+    OSL_ASSERT(m_innerThreadId != m_outerThreadId);
+
+    Msg mm;
+
+    do
+    {
+        m_innerCondition.wait();
+        m_innerCondition.reset();
+
+        mm = m_message;
+
+        switch(mm)
+        {
+        case CB_DONE:
+            break;
+
+        case CB_FPOINTER:
+        {
+            m_pCallee(m_pParam);
+
+            m_message = CB_DONE;
+            m_outerCondition.set();
+            break;
+        }
+        default:
+            abort();
+        }
+    }
+    while(mm != CB_DONE);
+}
+
+void AffineBridge::v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    osl::MutexGuard guard(m_outerMutex); // only one thread at a time can call into
+
+    if (m_innerThreadId == 0) // no inner thread yet
+    {
+        m_pInnerThread.reset(new InnerThread(this));
+    }
+
+    bool bResetId = false;
+    if (!m_outerThreadId)
+    {
+        m_outerThreadId = osl::Thread::getCurrentIdentifier();
+        bResetId = true;
+    }
+
+    m_message = CB_FPOINTER;
+    m_pCallee = pCallee;
+    m_pParam  = pParam;
+    m_innerCondition.set();
+
+    outerDispatch(true);
+
+    if (bResetId)
+        m_outerThreadId = 0;
+}
+
+void AffineBridge::v_callOut_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    OSL_ASSERT(m_innerThreadId);
+
+    osl::MutexGuard guard(m_innerMutex);
+
+    if (m_outerThreadId == 0) // no outer thread yet
+    {
+        osl::MutexGuard guard_m_outerMutex(m_outerMutex);
+
+        if (m_outerThreadId == 0)
+        {
+            if (m_pOuterThread)
+            {
+                m_pOuterThread->join();
+            }
+
+            m_pOuterThread.reset(new OuterThread(this));
+        }
+    }
+
+    m_message = CB_FPOINTER;
+    m_pCallee = pCallee;
+    m_pParam  = pParam;
+    m_outerCondition.set();
+
+    innerDispatch();
+}
+
+void AffineBridge::v_enter()
+{
+    m_innerMutex.acquire();
+
+    if (!m_enterCount)
+        m_innerThreadId = osl::Thread::getCurrentIdentifier();
+
+    OSL_ASSERT(m_innerThreadId == osl::Thread::getCurrentIdentifier());
+
+    ++ m_enterCount;
+}
+
+void AffineBridge::v_leave()
+{
+    OSL_ASSERT(m_innerThreadId == osl::Thread::getCurrentIdentifier());
+
+    -- m_enterCount;
+    if (!m_enterCount)
+        m_innerThreadId = 0;
+
+    m_innerMutex.release();
+}
+
+bool AffineBridge::v_isValid(OUString * pReason)
+{
+    bool result = m_enterCount > 0;
+    if (!result)
+        *pReason = "not entered";
+
+    else
+    {
+        result = m_innerThreadId == osl::Thread::getCurrentIdentifier();
+
+        if (!result)
+            *pReason = "wrong thread";
+    }
+
+    if (result)
+        *pReason = "OK";
+
+    return result;
+}
+
+#ifdef DISABLE_DYNLOADING
+
+#define uno_initEnvironment affine_uno_uno_initEnvironment
+#define uno_ext_getMapping affine_uno_uno_ext_getMapping
+
+#endif
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_initEnvironment(uno_Environment * pEnv)
+    SAL_THROW_EXTERN_C()
+{
+    cppu::helper::purpenv::Environment_initWithEnterable(pEnv, new AffineBridge());
+}
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_ext_getMapping(uno_Mapping     ** ppMapping,
+                                                        uno_Environment  * pFrom,
+                                                        uno_Environment  * pTo )
+{
+    cppu::helper::purpenv::createMapping(ppMapping, pFrom, pTo);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/LogBridge/LogBridge.cxx b/cppu/source/LogBridge/LogBridge.cxx
new file mode 100644
index 000000000..b93b43b64
--- /dev/null
+++ b/cppu/source/LogBridge/LogBridge.cxx
@@ -0,0 +1,262 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <osl/mutex.hxx>
+#include <osl/thread.h>
+#include <osl/thread.hxx>
+#include <osl/diagnose.h>
+#include <cppu/Enterable.hxx>
+#include <cppu/helper/purpenv/Environment.hxx>
+#include <cppu/helper/purpenv/Mapping.hxx>
+#include <com/sun/star/uno/Type.hxx>
+#include <sal/log.hxx>
+
+namespace
+{
+class LogBridge : public cppu::Enterable
+{
+    osl::Mutex          m_mutex;
+    sal_Int32           m_count;
+    oslThreadIdentifier m_threadId;
+
+    virtual  ~LogBridge() override;
+
+public:
+    explicit LogBridge();
+
+    virtual void v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam) override;
+    virtual void v_callOut_v (uno_EnvCallee * pCallee, va_list * pParam) override;
+
+    virtual void v_enter() override;
+    virtual void v_leave() override;
+
+    virtual bool v_isValid(OUString * pReason) override;
+};
+
+LogBridge::LogBridge()
+    : m_count   (0)
+      ,m_threadId(0)
+{
+}
+
+LogBridge::~LogBridge()
+{
+    OSL_ASSERT(m_count >= 0);
+}
+
+void LogBridge::v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    enter();
+    pCallee(pParam);
+    leave();
+}
+
+void LogBridge::v_callOut_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    OSL_ASSERT(m_count > 0);
+
+    -- m_count;
+    pCallee(pParam);
+    ++ m_count;
+
+    if (!m_threadId)
+        m_threadId = osl::Thread::getCurrentIdentifier();
+}
+
+void LogBridge::v_enter()
+{
+    m_mutex.acquire();
+
+    OSL_ASSERT(m_count >= 0);
+
+    if (m_count == 0)
+        m_threadId = osl::Thread::getCurrentIdentifier();
+
+    ++ m_count;
+}
+
+void LogBridge::v_leave()
+{
+    OSL_ASSERT(m_count > 0);
+
+    -- m_count;
+    if (!m_count)
+        m_threadId = 0;
+
+
+    m_mutex.release();
+}
+
+bool LogBridge::v_isValid(OUString * pReason)
+{
+    bool result = m_count > 0;
+    if (!result)
+    {
+        *pReason = "not entered";
+    }
+    else
+    {
+        result = m_threadId == osl::Thread::getCurrentIdentifier();
+
+        if (!result)
+            *pReason = "wrong thread";
+    }
+
+    if (result)
+        *pReason = "OK";
+
+    return result;
+}
+
+    void traceValue(typelib_TypeDescriptionReference* _pTypeRef,void* pArg)
+    {
+        switch(_pTypeRef->eTypeClass)
+        {
+            case typelib_TypeClass_STRING:
+                SAL_INFO("cppu.log", "" << *static_cast< OUString*>(pArg));
+                break;
+            case typelib_TypeClass_BOOLEAN:
+               SAL_INFO("cppu.log", "" << *static_cast<sal_Bool*>(pArg));
+                break;
+            case typelib_TypeClass_BYTE:
+               SAL_INFO("cppu.log", "" << *static_cast<sal_Int8*>(pArg));
+                break;
+            case typelib_TypeClass_CHAR:
+               SAL_INFO("cppu.log", "" << *static_cast<char*>(pArg));
+                break;
+            case typelib_TypeClass_SHORT:
+            case typelib_TypeClass_UNSIGNED_SHORT:
+               SAL_INFO("cppu.log", "" << *static_cast<sal_Int16*>(pArg));
+                break;
+            case typelib_TypeClass_LONG:
+            case typelib_TypeClass_UNSIGNED_LONG:
+            case typelib_TypeClass_ENUM:
+               SAL_INFO("cppu.log", "" << *static_cast<sal_Int32*>(pArg));
+                break;
+            case typelib_TypeClass_HYPER:
+            case typelib_TypeClass_UNSIGNED_HYPER:
+               SAL_INFO("cppu.log", "" << *static_cast<sal_Int64*>(pArg));
+                break;
+            case typelib_TypeClass_FLOAT:
+               SAL_INFO("cppu.log", "" << *static_cast<float*>(pArg));
+                break;
+            case typelib_TypeClass_DOUBLE:
+               SAL_INFO("cppu.log", "" << *static_cast<double*>(pArg));
+                break;
+            case typelib_TypeClass_TYPE:
+                SAL_INFO("cppu.log", "" << static_cast<css::uno::Type*>(pArg)->getTypeName());
+                break;
+            case typelib_TypeClass_ANY:
+                if ( static_cast<uno_Any*>(pArg)->pData )
+                    traceValue(static_cast<uno_Any*>(pArg)->pType,static_cast<uno_Any*>(pArg)->pData);
+                else
+                   SAL_INFO("cppu.log", "void");
+                break;
+            case typelib_TypeClass_EXCEPTION:
+               SAL_INFO("cppu.log", "exception");
+                break;
+            case typelib_TypeClass_INTERFACE:
+                SAL_INFO("cppu.log", "" << _pTypeRef->pTypeName << "0x" << std::hex << pArg);
+                break;
+            case typelib_TypeClass_VOID:
+               SAL_INFO("cppu.log", "void");
+                break;
+            default:
+               SAL_INFO("cppu.log", "0x" << std::hex << pArg);
+                break;
+        } // switch(pParams[i].pTypeRef->eTypeClass)
+    }
+}
+
+static void LogProbe(
+    bool                                pre,
+    SAL_UNUSED_PARAMETER void         * /*pThis*/,
+    SAL_UNUSED_PARAMETER void         * /*pContext*/,
+    typelib_TypeDescriptionReference  * pReturnTypeRef,
+    typelib_MethodParameter           * pParams,
+    sal_Int32                           nParams,
+    typelib_TypeDescription     const * pMemberType,
+    void                              * pReturn,
+    void                              * pArgs[],
+    uno_Any                          ** ppException )
+{
+    OString sTemp;
+    if ( pMemberType && pMemberType->pTypeName )
+        sTemp = OUStringToOString(
+            OUString::unacquired(&pMemberType->pTypeName),RTL_TEXTENCODING_ASCII_US);
+    if ( pre  )
+    {
+        SAL_INFO("cppu.log", "{ LogBridge () " << sTemp );
+        if ( nParams )
+        {
+            SAL_INFO("cppu.log", "\n| : ( LogBridge ");
+            for(sal_Int32 i = 0;i < nParams;++i)
+            {
+                if ( i > 0 )
+                   SAL_INFO("cppu.log", ",");
+                traceValue(pParams[i].pTypeRef,pArgs[i]);
+
+            }
+            SAL_INFO("cppu.log", ")");
+        } // if ( nParams )
+        SAL_INFO("cppu.log", "\n");
+    }
+    else if ( !pre )
+    {
+        SAL_INFO("cppu.log", "} LogBridge () " << sTemp);
+        if ( ppException && *ppException )
+        {
+            SAL_INFO("cppu.log", " exception occurred : ");
+            typelib_TypeDescription * pElementTypeDescr = nullptr;
+            TYPELIB_DANGER_GET( &pElementTypeDescr, (*ppException)->pType );
+            SAL_INFO("cppu.log", "" << pElementTypeDescr->pTypeName);
+            TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        }
+        else if ( pReturnTypeRef )
+        {
+            SAL_INFO("cppu.log", " return : ");
+            traceValue(pReturnTypeRef,pReturn);
+        } // if ( pReturn && pReturnTypeRef )
+
+        SAL_INFO("cppu.log", "\n");
+    }
+}
+
+#ifdef DISABLE_DYNLOADING
+
+#define uno_initEnvironment log_uno_uno_initEnvironment
+#define uno_ext_getMapping log_uno_uno_ext_getMapping
+
+#endif
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_initEnvironment(uno_Environment * pEnv)
+    SAL_THROW_EXTERN_C()
+{
+    cppu::helper::purpenv::Environment_initWithEnterable(pEnv, new LogBridge());
+}
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_ext_getMapping(uno_Mapping     ** ppMapping,
+                                   uno_Environment  * pFrom,
+                                   uno_Environment  * pTo )
+{
+    cppu::helper::purpenv::createMapping(ppMapping, pFrom, pTo,LogProbe);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/UnsafeBridge/UnsafeBridge.cxx b/cppu/source/UnsafeBridge/UnsafeBridge.cxx
new file mode 100644
index 000000000..491a888c3
--- /dev/null
+++ b/cppu/source/UnsafeBridge/UnsafeBridge.cxx
@@ -0,0 +1,144 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <osl/mutex.hxx>
+#include <osl/thread.h>
+#include <osl/thread.hxx>
+#include <sal/log.hxx>
+
+#include <cppu/Enterable.hxx>
+#include <cppu/helper/purpenv/Environment.hxx>
+#include <cppu/helper/purpenv/Mapping.hxx>
+
+namespace {
+
+class UnsafeBridge : public cppu::Enterable
+{
+    osl::Mutex          m_mutex;
+    sal_Int32           m_count;
+    oslThreadIdentifier m_threadId;
+
+    virtual  ~UnsafeBridge() override;
+
+public:
+    explicit UnsafeBridge();
+
+    virtual void v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam) override;
+    virtual void v_callOut_v (uno_EnvCallee * pCallee, va_list * pParam) override;
+
+    virtual void v_enter() override;
+    virtual void v_leave() override;
+
+    virtual bool v_isValid(OUString * pReason) override;
+};
+
+}
+
+UnsafeBridge::UnsafeBridge()
+    : m_count   (0),
+      m_threadId(0)
+{
+    SAL_INFO("cppu.unsafebridge", "LIFE: UnsafeBridge::UnsafeBridge(uno_Environment * pEnv) -> " << this);
+}
+
+UnsafeBridge::~UnsafeBridge()
+{
+    SAL_INFO("cppu.unsafebridge", "LIFE: UnsafeBridge::~UnsafeBridge() -> " << this);
+
+    SAL_WARN_IF(m_count < 0, "cppu.unsafebridge", "m_count is less than 0");
+}
+
+void UnsafeBridge::v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    enter();
+    pCallee(pParam);
+    leave();
+}
+
+void UnsafeBridge::v_callOut_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    SAL_WARN_IF(m_count <= 0, "cppu.unsafebridge", "m_count is less than or equal to 0");
+
+    -- m_count;
+    pCallee(pParam);
+    ++ m_count;
+
+    if (!m_threadId)
+        m_threadId = osl::Thread::getCurrentIdentifier();
+}
+
+void UnsafeBridge::v_enter()
+{
+    m_mutex.acquire();
+
+    SAL_WARN_IF(m_count < 0, "cppu.unsafebridge", "m_count is less than 0");
+
+    if (m_count == 0)
+        m_threadId = osl::Thread::getCurrentIdentifier();
+
+    ++ m_count;
+}
+
+void UnsafeBridge::v_leave()
+{
+    SAL_WARN_IF(m_count <= 0, "cppu.unsafebridge", "m_count is less than or equal to 0");
+
+    -- m_count;
+    if (!m_count)
+        m_threadId = 0;
+
+
+    m_mutex.release();
+}
+
+bool UnsafeBridge::v_isValid(OUString * pReason)
+{
+    bool result = m_count > 0;
+    if (!result)
+    {
+        *pReason = "not entered";
+    }
+    else
+    {
+        result = m_threadId == osl::Thread::getCurrentIdentifier();
+
+        if (!result)
+            *pReason = "wrong thread";
+    }
+
+    if (result)
+        *pReason = "OK";
+
+    return result;
+}
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_initEnvironment(uno_Environment * pEnv)
+    SAL_THROW_EXTERN_C()
+{
+    cppu::helper::purpenv::Environment_initWithEnterable(pEnv, new UnsafeBridge());
+}
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_ext_getMapping(uno_Mapping     ** ppMapping,
+                                   uno_Environment  * pFrom,
+                                   uno_Environment  * pTo )
+{
+    cppu::helper::purpenv::createMapping(ppMapping, pFrom, pTo);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/cppu/compat.cxx b/cppu/source/cppu/compat.cxx
new file mode 100644
index 000000000..06181e6ef
--- /dev/null
+++ b/cppu/source/cppu/compat.cxx
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <sal/config.h>
+
+#include <cstdlib>
+
+#include <typelib/typedescription.h>
+#include <rtl/ustring.h>
+#include <sal/types.h>
+
+// Stubs for removed functionality, to be killed when we bump sal SONAME
+
+extern "C" {
+
+SAL_DLLPUBLIC_EXPORT void SAL_CALL typelib_static_array_type_init(
+    typelib_TypeDescriptionReference **, typelib_TypeDescriptionReference *,
+    sal_Int32, ...) SAL_THROW_EXTERN_C()
+{
+    std::abort();
+}
+
+SAL_DLLPUBLIC_EXPORT void SAL_CALL typelib_typedescription_newArray(
+    typelib_TypeDescription **, typelib_TypeDescriptionReference *,
+    sal_Int32, sal_Int32 *) SAL_THROW_EXTERN_C()
+{
+    std::abort();
+}
+
+SAL_DLLPUBLIC_EXPORT void SAL_CALL typelib_typedescription_newUnion(
+    typelib_TypeDescription **, rtl_uString *,
+    typelib_TypeDescriptionReference *, sal_Int64,
+    typelib_TypeDescriptionReference *, sal_Int32, void *)
+    SAL_THROW_EXTERN_C()
+{
+    std::abort();
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/cppu/cppu_opt.cxx b/cppu/source/cppu/cppu_opt.cxx
new file mode 100644
index 000000000..40f90de6e
--- /dev/null
+++ b/cppu/source/cppu/cppu_opt.cxx
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <com/sun/star/uno/Any.hxx>
+#include <typelib/typedescription.h>
+#include <uno/any2.h>
+#include <rtl/ustring.hxx>
+
+
+using namespace ::rtl;
+
+
+extern "C" rtl_uString * SAL_CALL cppu_unsatisfied_iquery_msg(
+    typelib_TypeDescriptionReference * pType )
+    SAL_THROW_EXTERN_C()
+{
+    OUString ret = "unsatisfied query for interface of type "
+        + OUString::unacquired( &pType->pTypeName ) + "!";
+    rtl_uString_acquire( ret.pData );
+    return ret.pData;
+}
+
+
+extern "C" rtl_uString * SAL_CALL cppu_unsatisfied_iset_msg(
+    typelib_TypeDescriptionReference * pType )
+    SAL_THROW_EXTERN_C()
+{
+    OUString ret = "invalid attempt to assign an empty interface of type "
+        + OUString::unacquired( &pType->pTypeName ) + "!";
+    rtl_uString_acquire( ret.pData );
+    return ret.pData;
+}
+
+
+extern "C" rtl_uString * SAL_CALL cppu_Any_extraction_failure_msg(
+    uno_Any const * pAny, typelib_TypeDescriptionReference * pType )
+    SAL_THROW_EXTERN_C()
+{
+    OUString ret = "Cannot extract an Any(" +
+        OUString::unacquired(&pAny->pType->pTypeName) +
+        ") to " +
+        OUString::unacquired(&pType->pTypeName) +
+        "!";
+    rtl_uString_acquire( ret.pData );
+    return ret.pData;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/helper/purpenv/Proxy.hxx b/cppu/source/helper/purpenv/Proxy.hxx
new file mode 100644
index 000000000..02c65a23a
--- /dev/null
+++ b/cppu/source/helper/purpenv/Proxy.hxx
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <osl/interlck.h>
+
+#include <uno/environment.hxx>
+#include <uno/mapping.hxx>
+#include <uno/dispatcher.h>
+
+#include <cppu/helper/purpenv/Mapping.hxx>
+
+
+class Proxy : public uno_Interface
+{
+    oslInterlockedCount                 m_nRef;
+
+    css::uno::Environment                   m_from;
+    css::uno::Environment                   m_to;
+
+    css::uno::Mapping                       m_from_to;
+    css::uno::Mapping                       m_to_from;
+
+    // mapping information
+    uno_Interface                    *  m_pUnoI; // wrapped interface
+    typelib_InterfaceTypeDescription *  m_pTypeDescr;
+    OUString                            m_aOId;
+
+    cppu::helper::purpenv::ProbeFun   * m_probeFun;
+    void                              * m_pProbeContext;
+
+public:
+    explicit Proxy(css::uno::Mapping                        to_from,
+                   uno_Environment                        * pTo,
+                   uno_Environment                        * pFrom,
+                   uno_Interface                          * pUnoI,
+                   typelib_InterfaceTypeDescription       * pTypeDescr,
+                   OUString                         const & rOId,
+                   cppu::helper::purpenv::ProbeFun        * probeFun,
+                   void                                   * pProbeContext);
+    ~Proxy();
+
+    void acquire();
+    void release();
+
+    void dispatch(
+        typelib_TypeDescriptionReference  * pReturnTypeRef,
+        typelib_MethodParameter           * pParams,
+        sal_Int32                           nParams,
+        typelib_TypeDescription     const * pMemberType,
+        void                              * pReturn,
+        void                              * pArgs[],
+        uno_Any                          ** ppException );
+
+};
+
+extern "C" void Proxy_free(uno_ExtEnvironment * pEnv, void * pProxy) SAL_THROW_EXTERN_C();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/helper/purpenv/helper_purpenv_Environment.cxx b/cppu/source/helper/purpenv/helper_purpenv_Environment.cxx
new file mode 100644
index 000000000..a0163939f
--- /dev/null
+++ b/cppu/source/helper/purpenv/helper_purpenv_Environment.cxx
@@ -0,0 +1,522 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <cppu/helper/purpenv/Environment.hxx>
+
+#include <osl/diagnose.h>
+#include <sal/log.hxx>
+#include <uno/lbnames.h>
+#include <cppu/Enterable.hxx>
+
+#include <typelib/typedescription.h>
+#include <osl/interlck.h>
+#include <memory>
+
+extern "C" {
+typedef void EnvFun_P   (uno_Environment *);
+typedef void EnvFun_PP_P(uno_Environment ** ppHardEnv, uno_Environment *);
+typedef void ExtEnv_registerProxyInterface (uno_ExtEnvironment                 *,
+                                                     void                              ** ppProxy,
+                                                     uno_freeProxyFunc                    freeProxy,
+                                                     rtl_uString * pOId,
+                                                     typelib_InterfaceTypeDescription   * pTypeDescr);
+typedef void ExtEnv_revokeInterface        (uno_ExtEnvironment                 *,
+                                                     void                               * pInterface);
+typedef void ExtEnv_getObjectIdentifier    (uno_ExtEnvironment                 *,
+                                                     rtl_uString                       **,
+                                                     void                               *);
+typedef void ExtEnv_getRegisteredInterface (uno_ExtEnvironment                 *,
+                                                     void                              **,
+                                                     rtl_uString                        *,
+                                                     typelib_InterfaceTypeDescription   *);
+typedef void ExtEnv_getRegisteredInterfaces(uno_ExtEnvironment                 *,
+                                                     void                             *** pppInterfaces,
+                                                     sal_Int32                          * pnLen,
+                                                     uno_memAlloc                         memAlloc);
+typedef void ExtEnv_computeObjectIdentifier(uno_ExtEnvironment                 *,
+                                                     rtl_uString                       ** ppOId,
+                                                     void                               * pInterface);
+typedef void ExtEnv_acquireInterface       (uno_ExtEnvironment                 *,
+                                                     void                               * pInterface);
+typedef void ExtEnv_releaseInterface       (uno_ExtEnvironment                 *,
+                                                     void                               * pInterface);
+}
+
+namespace {
+
+class Base : public cppu::Enterable
+{
+public:
+    explicit Base(uno_Environment * pEnv, cppu::Enterable * pEnterable);
+
+    void acquireWeak();
+    void releaseWeak();
+    void harden     (uno_Environment ** ppHardEnv);
+    void acquire();
+    void release();
+
+    void registerProxyInterface (void                                  ** ppProxy,
+                                 uno_freeProxyFunc                        freeProxy,
+                                 OUString                         const & oid,
+                                 typelib_InterfaceTypeDescription       * pTypeDescr);
+    void revokeInterface        (void                                   * pInterface);
+    void getObjectIdentifier    (void                                   * pInterface,
+                                 OUString                               * pOid);
+    void getRegisteredInterface (void                                  **,
+                                 OUString                    const & oid,
+                                 typelib_InterfaceTypeDescription       *);
+    void getRegisteredInterfaces(void                                 ***,
+                                 sal_Int32                              * pnLen,
+                                 uno_memAlloc                             memAlloc);
+    void computeObjectIdentifier(void                                   * pInterface,
+                                 OUString                               * pOid);
+    void acquireInterface       (void                                   * pInterface);
+    void releaseInterface       (void                                   * pInterface);
+
+    virtual void v_enter() override;
+    virtual void v_leave() override;
+    virtual void v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam) override;
+    virtual void v_callOut_v (uno_EnvCallee * pCallee, va_list * pParam) override;
+    virtual bool v_isValid   (OUString * pReason) override;
+
+protected:
+    oslInterlockedCount    m_nRef;
+    uno_Environment      * m_pEnv;
+    std::unique_ptr<cppu::Enterable> m_pEnterable;
+
+    EnvFun_P    * m_env_acquire;
+    EnvFun_P    * m_env_release;
+    EnvFun_PP_P * m_env_harden;
+    EnvFun_P    * m_env_acquireWeak;
+    EnvFun_P    * m_env_releaseWeak;
+
+    ExtEnv_registerProxyInterface  * m_env_registerProxyInterface;
+    ExtEnv_revokeInterface         * m_env_revokeInterface;
+    ExtEnv_getObjectIdentifier     * m_env_getObjectIdentifier;
+    ExtEnv_getRegisteredInterface  * m_env_getRegisteredInterface;
+    ExtEnv_getRegisteredInterfaces * m_env_getRegisteredInterfaces;
+    ExtEnv_computeObjectIdentifier * m_env_computeObjectIdentifier;
+    ExtEnv_acquireInterface        * m_env_acquireInterface;
+    ExtEnv_releaseInterface        * m_env_releaseInterface;
+
+    virtual  ~Base() override;
+};
+
+}
+
+extern "C" {
+static void s_acquire(uno_Environment * pEnv) //SAL_THROW_EXTERN_C()
+{
+    Base * pBase = static_cast<Base *>(pEnv->pReserved);
+    pBase->acquire();
+}
+
+static void s_release(uno_Environment * pEnv) SAL_THROW_EXTERN_C()
+{
+    Base * pBase = static_cast<Base *>(pEnv->pReserved);
+    pBase->release();
+}
+
+static void s_harden(uno_Environment ** ppHardEnv, uno_Environment * pEnv) SAL_THROW_EXTERN_C()
+{
+    Base * pBase = static_cast<Base *>(pEnv->pReserved);
+    pBase->harden(ppHardEnv);
+}
+
+static void s_acquireWeak(uno_Environment * pEnv) SAL_THROW_EXTERN_C()
+{
+    Base * pBase = static_cast<Base *>(pEnv->pReserved);
+    pBase->acquireWeak();
+}
+
+static void s_releaseWeak(uno_Environment * pEnv) SAL_THROW_EXTERN_C()
+{
+    Base * pBase = static_cast<Base *>(pEnv->pReserved);
+    pBase->releaseWeak();
+}
+
+
+static void s_registerProxyInterface(uno_ExtEnvironment                * pExtEnv,
+                                                         void                             ** ppProxy,
+                                                         uno_freeProxyFunc                   freeProxy,
+                                                         rtl_uString                       * pOId,
+                                                         typelib_InterfaceTypeDescription  * pTypeDescr)
+{
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->registerProxyInterface(ppProxy, freeProxy, pOId, pTypeDescr);
+}
+
+static void s_revokeInterface(uno_ExtEnvironment * pExtEnv, void * pInterface)
+{
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->revokeInterface(pInterface);
+}
+
+static void s_getObjectIdentifier(uno_ExtEnvironment *  pExtEnv,
+                                                      rtl_uString        ** ppOId,
+                                                      void               *  pInterface)
+{
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->getObjectIdentifier(pInterface, reinterpret_cast<OUString *>(ppOId));
+}
+
+static void s_getRegisteredInterface(uno_ExtEnvironment *  pExtEnv,
+                                                         void               ** ppInterface,
+                                                         rtl_uString        *  pOId,
+                                                         typelib_InterfaceTypeDescription * pTypeDescr)
+{
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->getRegisteredInterface(ppInterface, pOId, pTypeDescr);
+}
+
+static void s_getRegisteredInterfaces(uno_ExtEnvironment   * pExtEnv,
+                                                          void               *** pppInterface,
+                                                          sal_Int32            * pnLen,
+                                                          uno_memAlloc           memAlloc)
+{
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->getRegisteredInterfaces(pppInterface, pnLen, memAlloc);
+}
+
+static void s_computeObjectIdentifier(uno_ExtEnvironment *  pExtEnv,
+                                                          rtl_uString        ** ppOId,
+                                                          void               *  pInterface)
+{
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->computeObjectIdentifier(pInterface, reinterpret_cast<OUString *>(ppOId));
+}
+
+static void s_acquireInterface(uno_ExtEnvironment * pExtEnv, void * pInterface) {
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->acquireInterface(pInterface);
+}
+
+static void s_releaseInterface(uno_ExtEnvironment * pExtEnv, void * pInterface) {
+    Base * pBase = static_cast<Base *>(pExtEnv->aBase.pReserved);
+    pBase->releaseInterface(pInterface);
+}
+
+}
+
+Base::Base(uno_Environment * pEnv, cppu::Enterable * pEnterable)
+    :m_nRef(1),
+     m_pEnv(pEnv),
+     m_pEnterable     (pEnterable),
+     m_env_acquire    (pEnv->acquire),
+     m_env_release    (pEnv->release),
+     m_env_harden     (pEnv->harden),
+     m_env_acquireWeak(pEnv->acquireWeak),
+     m_env_releaseWeak(pEnv->releaseWeak),
+     m_env_registerProxyInterface (pEnv->pExtEnv->registerProxyInterface),
+     m_env_revokeInterface        (pEnv->pExtEnv->revokeInterface),
+     m_env_getObjectIdentifier    (pEnv->pExtEnv->getObjectIdentifier),
+     m_env_getRegisteredInterface (pEnv->pExtEnv->getRegisteredInterface),
+     m_env_getRegisteredInterfaces(pEnv->pExtEnv->getRegisteredInterfaces),
+     m_env_computeObjectIdentifier(pEnv->pExtEnv->computeObjectIdentifier),
+     m_env_acquireInterface       (pEnv->pExtEnv->acquireInterface),
+     m_env_releaseInterface       (pEnv->pExtEnv->releaseInterface)
+{
+    SAL_INFO("cppu.purpenv", "LIFE: cppu::helper::purpenv::Base::Base(uno_Environment * pEnv) -> " << this);
+    OSL_ENSURE(
+        rtl_ustr_ascii_compare_WithLength(pEnv->pTypeName->buffer, rtl_str_getLength(UNO_LB_UNO), UNO_LB_UNO)
+            == 0,
+            "### wrong environment type!");
+
+    pEnv->acquire     = s_acquire;
+    pEnv->release     = s_release;
+    pEnv->harden      = s_harden;
+    pEnv->acquireWeak = s_acquireWeak;
+    pEnv->releaseWeak = s_releaseWeak;
+
+    pEnv->pExtEnv->registerProxyInterface  = s_registerProxyInterface;
+    pEnv->pExtEnv->revokeInterface         = s_revokeInterface;
+    pEnv->pExtEnv->getObjectIdentifier     = s_getObjectIdentifier;
+    pEnv->pExtEnv->getRegisteredInterface  = s_getRegisteredInterface;
+    pEnv->pExtEnv->getRegisteredInterfaces = s_getRegisteredInterfaces;
+    pEnv->pExtEnv->computeObjectIdentifier = s_computeObjectIdentifier;
+    pEnv->pExtEnv->acquireInterface        = s_acquireInterface;
+    pEnv->pExtEnv->releaseInterface        = s_releaseInterface;
+
+    pEnv->pReserved = this;
+}
+
+Base::~Base()
+{
+    SAL_INFO("cppu.purpenv", "LIFE: cppu::helper::purpenv::Base::~Base() -> " << this);
+
+    m_pEnv->acquire     = m_env_acquire;
+    m_pEnv->release     = m_env_release;
+    m_pEnv->harden      = m_env_harden;
+    m_pEnv->acquireWeak = m_env_acquireWeak;
+    m_pEnv->releaseWeak = m_env_releaseWeak;
+
+    m_pEnv->pReserved = nullptr;
+
+    m_pEnterable.reset();
+    m_pEnv->release(m_pEnv);
+}
+
+void Base::acquire()
+{
+    m_env_acquire(m_pEnv);
+
+    osl_atomic_increment(&m_nRef);
+}
+
+void Base::release()
+{
+    if (osl_atomic_decrement(&m_nRef) == 0)
+        delete this;
+
+    else
+        m_env_release(m_pEnv);
+}
+
+void Base::harden(uno_Environment ** ppHardEnv)
+{
+    m_env_harden(ppHardEnv, m_pEnv);
+    osl_atomic_increment(&m_nRef);
+}
+
+void Base::acquireWeak()
+{
+    m_env_acquireWeak(m_pEnv);
+}
+
+void Base::releaseWeak()
+{
+    m_env_releaseWeak(m_pEnv);
+}
+
+
+extern "C" { static void s_registerProxyInterface_v(va_list * pParam)
+{
+    uno_ExtEnvironment                   * pExtEnv    = va_arg(*pParam, uno_ExtEnvironment *);
+    void                                ** ppProxy    = va_arg(*pParam, void **);
+    uno_freeProxyFunc                      freeProxy  = va_arg(*pParam, uno_freeProxyFunc);
+    rtl_uString                          * pOId       = va_arg(*pParam, rtl_uString *);
+    typelib_InterfaceTypeDescription     * pTypeDescr = va_arg(*pParam, typelib_InterfaceTypeDescription *);
+    ExtEnv_registerProxyInterface  * pRegisterProxyInterface
+        = va_arg(*pParam, ExtEnv_registerProxyInterface *);
+
+    pRegisterProxyInterface(pExtEnv, ppProxy, freeProxy, pOId, pTypeDescr);
+}}
+
+void Base::registerProxyInterface(void                                  ** ppProxy,
+                                  uno_freeProxyFunc                        freeProxy,
+                                  OUString                         const & oid,
+                                  typelib_InterfaceTypeDescription       * pTypeDescr)
+{
+     uno_Environment_invoke(m_pEnv,
+                           s_registerProxyInterface_v,
+                           m_pEnv->pExtEnv,
+                           ppProxy,
+                           freeProxy,
+                           oid.pData,
+                           pTypeDescr,
+                           m_env_registerProxyInterface);
+}
+
+
+extern "C" { static void s_revokeInterface_v(va_list * pParam)
+{
+    uno_ExtEnvironment * pExtEnv    = va_arg(*pParam, uno_ExtEnvironment *);
+    void               * pInterface = va_arg(*pParam, void *);
+    ExtEnv_revokeInterface * pRevokeInterface = va_arg(*pParam, ExtEnv_revokeInterface *);
+
+    pRevokeInterface(pExtEnv, pInterface);
+}}
+
+void Base::revokeInterface(void * pInterface)
+{
+     uno_Environment_invoke(m_pEnv,
+                           s_revokeInterface_v,
+                           m_pEnv->pExtEnv,
+                           pInterface,
+                           m_env_revokeInterface);
+}
+
+
+extern "C" { static void s_getObjectIdentifier_v(va_list * pParam)
+{
+    uno_ExtEnvironment * pExtEnv    = va_arg(*pParam, uno_ExtEnvironment *);
+    void               * pInterface = va_arg(*pParam, void *);
+    OUString      * pOId       = va_arg(*pParam, OUString *);
+    ExtEnv_getObjectIdentifier * pGetObjectIdentifier
+        = va_arg(*pParam, ExtEnv_getObjectIdentifier *);
+
+    pGetObjectIdentifier(pExtEnv, reinterpret_cast<rtl_uString **>(pOId), pInterface);
+}}
+
+void Base::getObjectIdentifier(void * pInterface, OUString * pOid)
+{
+     uno_Environment_invoke(m_pEnv,
+                           s_getObjectIdentifier_v,
+                           m_pEnv->pExtEnv,
+                           pInterface,
+                           pOid,
+                           m_env_getObjectIdentifier);
+}
+
+
+extern "C" { static void s_getRegisteredInterface_v(va_list * pParam)
+{
+    uno_ExtEnvironment                   * pExtEnv     = va_arg(*pParam, uno_ExtEnvironment *);
+    void                                ** ppInterface = va_arg(*pParam, void **);
+    rtl_uString                          * pOId        = va_arg(*pParam, rtl_uString *);
+    typelib_InterfaceTypeDescription     * pTypeDescr  = va_arg(*pParam, typelib_InterfaceTypeDescription *);
+    ExtEnv_getRegisteredInterface  * pGetRegisteredInterface
+        = va_arg(*pParam, ExtEnv_getRegisteredInterface *);
+
+    pGetRegisteredInterface(pExtEnv, ppInterface, pOId, pTypeDescr);
+}}
+
+void Base::getRegisteredInterface(void ** ppInterface,
+                                  OUString const & oid,
+                                  typelib_InterfaceTypeDescription * pTypeDescr)
+{
+     uno_Environment_invoke(m_pEnv,
+                           s_getRegisteredInterface_v,
+                           m_pEnv->pExtEnv,
+                           ppInterface,
+                           oid.pData,
+                           pTypeDescr,
+                           m_env_getRegisteredInterface);
+}
+
+
+extern "C" { static void s_getRegisteredInterfaces_v(va_list * pParam)
+{
+    uno_ExtEnvironment   * pExtEnv      = va_arg(*pParam, uno_ExtEnvironment *);
+    void               *** pppInterface = va_arg(*pParam, void ***);
+    sal_Int32            * pnLen        = va_arg(*pParam, sal_Int32 *);
+    uno_memAlloc           memAlloc     = va_arg(*pParam, uno_memAlloc);
+    ExtEnv_getRegisteredInterfaces * pGetRegisteredInterfaces
+        = va_arg(*pParam, ExtEnv_getRegisteredInterfaces *);
+
+    pGetRegisteredInterfaces(pExtEnv, pppInterface, pnLen, memAlloc);
+}}
+
+void Base::getRegisteredInterfaces(void         *** pppInterface,
+                                   sal_Int32      * pnLen,
+                                   uno_memAlloc     memAlloc)
+{
+     uno_Environment_invoke(m_pEnv,
+                           s_getRegisteredInterfaces_v,
+                           m_pEnv->pExtEnv,
+                           pppInterface,
+                           pnLen,
+                           memAlloc,
+                           m_env_getRegisteredInterfaces);
+}
+
+
+extern "C" { static void s_computeObjectIdentifier_v(va_list * pParam)
+{
+    uno_ExtEnvironment * pExtEnv    = va_arg(*pParam, uno_ExtEnvironment *);
+    void               * pInterface = va_arg(*pParam, void *);
+    OUString      * pOId       = va_arg(*pParam, OUString *);
+    ExtEnv_computeObjectIdentifier * pComputeObjectIdentifier
+        = va_arg(*pParam, ExtEnv_computeObjectIdentifier *);
+
+    pComputeObjectIdentifier(pExtEnv, reinterpret_cast<rtl_uString **>(pOId), pInterface);
+}}
+
+void Base::computeObjectIdentifier(void * pInterface, OUString * pOid)
+{
+     uno_Environment_invoke(m_pEnv,
+                           s_computeObjectIdentifier_v,
+                           m_pEnv->pExtEnv,
+                           pInterface,
+                           pOid,
+                           m_env_computeObjectIdentifier);
+}
+
+
+extern "C" { static void s_acquireInterface_v(va_list * pParam)
+{
+    uno_ExtEnvironment * pExtEnv    = va_arg(*pParam, uno_ExtEnvironment *);
+    void               * pInterface = va_arg(*pParam, void *);
+    ExtEnv_acquireInterface * pAcquireInterface
+        = va_arg(*pParam, ExtEnv_acquireInterface *);
+
+    pAcquireInterface(pExtEnv, pInterface);
+}}
+
+void Base::acquireInterface(void * pInterface)
+{
+     uno_Environment_invoke(m_pEnv, s_acquireInterface_v, m_pEnv->pExtEnv, pInterface, m_env_acquireInterface);
+}
+
+
+extern "C" { static void s_releaseInterface_v(va_list * pParam)
+{
+    uno_ExtEnvironment * pExtEnv    = va_arg(*pParam, uno_ExtEnvironment *);
+    void               * pInterface = va_arg(*pParam, void *);
+    ExtEnv_releaseInterface * pReleaseInterface
+        = va_arg(*pParam, ExtEnv_releaseInterface *);
+
+    pReleaseInterface(pExtEnv, pInterface);
+}}
+
+void Base::releaseInterface(void * pInterface)
+{
+     uno_Environment_invoke(m_pEnv,
+                           s_releaseInterface_v,
+                           m_pEnv->pExtEnv,
+                           pInterface,
+                           m_env_releaseInterface);
+}
+
+void Base::v_enter()
+{
+    m_pEnterable->enter();
+}
+
+void Base::v_leave()
+{
+    m_pEnterable->leave();
+}
+
+void Base::v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    m_pEnterable->callInto_v(pCallee, pParam);
+}
+
+void Base::v_callOut_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+    m_pEnterable->callOut_v(pCallee, pParam);
+}
+
+bool Base::v_isValid(OUString * pReason)
+{
+    return m_pEnterable->isValid(pReason);
+}
+
+namespace cppu::helper::purpenv {
+
+void Environment_initWithEnterable(uno_Environment * pEnvironment, cppu::Enterable * pEnterable)
+{
+    new Base(pEnvironment, pEnterable);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/helper/purpenv/helper_purpenv_Mapping.cxx b/cppu/source/helper/purpenv/helper_purpenv_Mapping.cxx
new file mode 100644
index 000000000..f68a47390
--- /dev/null
+++ b/cppu/source/helper/purpenv/helper_purpenv_Mapping.cxx
@@ -0,0 +1,215 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <cppu/helper/purpenv/Mapping.hxx>
+
+#include "Proxy.hxx"
+
+#include <osl/interlck.h>
+#include <sal/log.hxx>
+#include <uno/environment.hxx>
+#include <uno/dispatcher.h>
+
+using namespace com::sun::star;
+
+namespace {
+
+class Mapping : public uno_Mapping
+{
+    uno::Environment   m_from;
+    uno::Environment   m_to;
+
+    oslInterlockedCount m_nCount;
+
+    cppu::helper::purpenv::ProbeFun * m_probeFun;
+    void                            * m_pContext;
+
+public:
+    explicit  Mapping(uno_Environment                 * pFrom,
+                      uno_Environment                 * pTo,
+                      cppu::helper::purpenv::ProbeFun * probeFun,
+                      void                            * pProbeContext);
+    virtual  ~Mapping();
+
+    void mapInterface(
+        uno_Interface                    ** ppOut,
+        uno_Interface                     * pUnoI,
+        typelib_InterfaceTypeDescription  * pTypeDescr);
+
+    void acquire();
+    void release();
+};
+
+}
+
+static void s_mapInterface(
+    uno_Mapping                       * puno_Mapping,
+    void                             ** ppOut,
+    void                              * pUnoI,
+    typelib_InterfaceTypeDescription  * pTypeDescr )
+    SAL_THROW_EXTERN_C()
+{
+    Mapping * pMapping = static_cast<Mapping *>(puno_Mapping);
+    pMapping->mapInterface(
+        reinterpret_cast<uno_Interface **>(ppOut),
+        static_cast<uno_Interface *>(pUnoI), pTypeDescr);
+}
+
+extern "C" {
+static void s_acquire(uno_Mapping * puno_Mapping)
+    SAL_THROW_EXTERN_C()
+{
+    Mapping * pMapping = static_cast<Mapping *>(puno_Mapping);
+    pMapping->acquire();
+}
+
+static void s_release(uno_Mapping * puno_Mapping)
+    SAL_THROW_EXTERN_C()
+{
+    Mapping * pMapping = static_cast<Mapping * >(puno_Mapping);
+    pMapping->release();
+}
+
+
+static void s_getIdentifier_v(va_list * pParam)
+{
+    uno_ExtEnvironment *  pEnv  = va_arg(*pParam, uno_ExtEnvironment *);
+    rtl_uString        ** ppOid = va_arg(*pParam, rtl_uString **);
+    uno_Interface      *  pUnoI = va_arg(*pParam, uno_Interface *);
+
+    pEnv->getObjectIdentifier(pEnv, ppOid, pUnoI);
+}
+
+static void s_free(uno_Mapping * puno_Mapping)
+    SAL_THROW_EXTERN_C()
+{
+    Mapping * pMapping = static_cast<Mapping *>(puno_Mapping);
+    delete pMapping;
+}
+}
+
+Mapping::Mapping(uno_Environment                 * pFrom,
+                 uno_Environment                 * pTo,
+                 cppu::helper::purpenv::ProbeFun * probeFun,
+                 void                            * pProbeContext
+)
+    : m_from    (pFrom),
+      m_to      (pTo),
+      m_nCount  (1),
+      m_probeFun(probeFun),
+      m_pContext(pProbeContext)
+{
+    SAL_INFO("cppu.purpenv", "LIFE: Mapping::Mapping(uno_Environment * pFrom, uno_Environment * pTo -> " << this);
+
+    uno_Mapping::acquire      = s_acquire;
+    uno_Mapping::release      = s_release;
+    uno_Mapping::mapInterface = s_mapInterface;
+}
+
+Mapping::~Mapping()
+{
+    SAL_INFO("cppu.purpenv", "LIFE: Mapping:~Mapping() -> " << this);
+}
+
+
+void Mapping::mapInterface(
+    uno_Interface                    ** ppOut,
+    uno_Interface                     * pUnoI,
+    typelib_InterfaceTypeDescription  * pTypeDescr)
+{
+    OSL_ASSERT(ppOut && pTypeDescr);
+    if (*ppOut)
+    {
+        (*ppOut)->release(*ppOut);
+        *ppOut = nullptr;
+    }
+
+    if (!pUnoI)
+        return;
+
+    // get object id of uno interface to be wrapped
+    // need to enter environment because of potential "queryInterface" call
+    rtl_uString * pOId = nullptr;
+    uno_Environment_invoke(m_from.get(), s_getIdentifier_v, m_from.get(), &pOId, pUnoI);
+    OSL_ASSERT(pOId);
+
+     // try to get any known interface from target environment
+    m_to.get()->pExtEnv->getRegisteredInterface(m_to.get()->pExtEnv, reinterpret_cast<void **>(ppOut), pOId, pTypeDescr);
+
+    if (!*ppOut) // not yet there, register new proxy interface
+    {
+        // try to publish a new proxy (ref count initially 1)
+        uno_Interface * pProxy = new Proxy(this,
+                                           m_from.get(),
+                                           m_to.get(),
+                                           pUnoI,
+                                           pTypeDescr,
+                                           pOId,
+                                           m_probeFun,
+                                           m_pContext);
+
+        // proxy may be exchanged during registration
+        m_to.get()->pExtEnv->registerProxyInterface(m_to.get()->pExtEnv,
+                                                    reinterpret_cast<void **>(&pProxy),
+                                                    Proxy_free,
+                                                    pOId,
+                                                    pTypeDescr);
+
+        *ppOut = pProxy;
+    }
+
+    rtl_uString_release(pOId);
+}
+
+
+void Mapping::acquire()
+{
+    if (osl_atomic_increment(&m_nCount) == 1)
+    {
+        uno_Mapping * pMapping = this;
+
+        ::uno_registerMapping(&pMapping, s_free, m_from.get(), m_to.get(), nullptr);
+    }
+}
+
+void Mapping::release()
+{
+    if (osl_atomic_decrement(&m_nCount) == 0)
+        ::uno_revokeMapping(this);
+}
+
+
+namespace cppu::helper::purpenv {
+
+void createMapping(uno_Mapping     ** ppMapping,
+                   uno_Environment  * pFrom,
+                   uno_Environment  * pTo,
+                   ProbeFun         * probeFun,
+                   void             * pContext
+ )
+{
+    *ppMapping = new Mapping(pFrom, pTo, probeFun, pContext);
+
+    ::uno_registerMapping(ppMapping, s_free, pFrom, pTo, nullptr);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/helper/purpenv/helper_purpenv_Proxy.cxx b/cppu/source/helper/purpenv/helper_purpenv_Proxy.cxx
new file mode 100644
index 000000000..db4820fc9
--- /dev/null
+++ b/cppu/source/helper/purpenv/helper_purpenv_Proxy.cxx
@@ -0,0 +1,504 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include "Proxy.hxx"
+
+#include <sal/log.hxx>
+#include <uno/dispatcher.h>
+#include <typelib/typedescription.hxx>
+#include <utility>
+
+using namespace com::sun::star;
+
+static bool relatesToInterface(typelib_TypeDescription * pTypeDescr)
+{
+    switch (pTypeDescr->eTypeClass)
+    {
+//      case typelib_TypeClass_TYPEDEF:
+    case typelib_TypeClass_SEQUENCE:
+    {
+        switch (reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType->eTypeClass)
+        {
+        case typelib_TypeClass_INTERFACE:
+        case typelib_TypeClass_ANY: // might relate to interface
+            return true;
+        case typelib_TypeClass_SEQUENCE:
+        case typelib_TypeClass_STRUCT:
+        case typelib_TypeClass_EXCEPTION:
+        {
+            typelib_TypeDescription * pTD = nullptr;
+            TYPELIB_DANGER_GET( &pTD, reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType );
+            bool bRel = relatesToInterface( pTD );
+            TYPELIB_DANGER_RELEASE( pTD );
+            return bRel;
+        }
+        default:
+            ;
+        }
+        return false;
+    }
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+    {
+        // ...optimized... to avoid getDescription() calls!
+        typelib_CompoundTypeDescription * pComp    = reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr);
+        typelib_TypeDescriptionReference ** pTypes = pComp->ppTypeRefs;
+        for ( sal_Int32 nPos = pComp->nMembers; nPos--; )
+        {
+            switch (pTypes[nPos]->eTypeClass)
+            {
+            case typelib_TypeClass_INTERFACE:
+            case typelib_TypeClass_ANY: // might relate to interface
+                return true;
+//              case typelib_TypeClass_TYPEDEF:
+            case typelib_TypeClass_SEQUENCE:
+            case typelib_TypeClass_STRUCT:
+            case typelib_TypeClass_EXCEPTION:
+            {
+                typelib_TypeDescription * pTD = nullptr;
+                TYPELIB_DANGER_GET( &pTD, pTypes[nPos] );
+                bool bRel = relatesToInterface( pTD );
+                TYPELIB_DANGER_RELEASE( pTD );
+                if (bRel)
+                    return true;
+                break;
+            }
+            default:
+                break;
+            }
+        }
+        if (pComp->pBaseTypeDescription)
+            return relatesToInterface( &pComp->pBaseTypeDescription->aBase );
+        break;
+    }
+    case typelib_TypeClass_ANY: // might relate to interface
+    case typelib_TypeClass_INTERFACE:
+        return true;
+
+    default:
+        ;
+    }
+    return false;
+}
+
+extern "C" { static void s_Proxy_dispatch(
+    uno_Interface                 * pUnoI,
+    typelib_TypeDescription const * pMemberType,
+    void                          * pReturn,
+    void                          * pArgs[],
+    uno_Any                      ** ppException)
+    SAL_THROW_EXTERN_C()
+{
+    Proxy * pThis = static_cast<Proxy *>(pUnoI);
+
+    typelib_MethodParameter            param;
+    sal_Int32                          nParams = 0;
+    typelib_MethodParameter          * pParams = nullptr;
+    typelib_TypeDescriptionReference * pReturnTypeRef = nullptr;
+    // sal_Int32                          nOutParams = 0;
+
+    switch (pMemberType->eTypeClass)
+    {
+    case typelib_TypeClass_INTERFACE_ATTRIBUTE:
+        if (pReturn)
+        {
+            pReturnTypeRef =
+                reinterpret_cast<typelib_InterfaceAttributeTypeDescription const *>(
+                 pMemberType)->pAttributeTypeRef;
+            nParams = 0;
+            pParams = nullptr;
+        }
+        else
+        {
+            param.pTypeRef = reinterpret_cast<typelib_InterfaceAttributeTypeDescription const *>(
+                              pMemberType)->pAttributeTypeRef;
+            param.bIn = true;
+            param.bOut = false;
+            nParams = 1;
+            pParams = &param;
+        }
+        break;
+    case typelib_TypeClass_INTERFACE_METHOD:
+    {
+        typelib_InterfaceMethodTypeDescription const * method_td =
+            reinterpret_cast<typelib_InterfaceMethodTypeDescription const *>(pMemberType);
+        pReturnTypeRef = method_td->pReturnTypeRef;
+        nParams = method_td->nParams;
+        pParams = method_td->pParams;
+        break;
+    }
+    default:
+        OSL_FAIL( "### illegal member typeclass!" );
+        abort();
+    }
+
+    pThis->dispatch( pReturnTypeRef,
+                     pParams,
+                     nParams,
+                     pMemberType,
+                     pReturn,
+                     pArgs,
+                     ppException );
+}}
+
+extern "C" void Proxy_free(SAL_UNUSED_PARAMETER uno_ExtEnvironment * /*pEnv*/, void * pProxy) SAL_THROW_EXTERN_C()
+{
+    Proxy * pThis = static_cast<Proxy * >(static_cast<uno_Interface *>(pProxy));
+    delete pThis;
+}
+
+extern "C" {
+static void s_Proxy_acquire(uno_Interface * pUnoI) SAL_THROW_EXTERN_C()
+{
+    Proxy * pProxy = static_cast<Proxy *>(pUnoI);
+    pProxy->acquire();
+}
+
+static void s_Proxy_release(uno_Interface * pUnoI) SAL_THROW_EXTERN_C()
+{
+    Proxy * pProxy = static_cast<Proxy *>(pUnoI);
+    pProxy->release();
+}
+
+static void s_acquireAndRegister_v(va_list * pParam)
+{
+    uno_Interface                    * pUnoI      = va_arg(*pParam, uno_Interface *);
+    rtl_uString                      * pOid       = va_arg(*pParam, rtl_uString *);
+    typelib_InterfaceTypeDescription * pTypeDescr = va_arg(*pParam, typelib_InterfaceTypeDescription *);
+    uno_ExtEnvironment               * pEnv       = va_arg(*pParam, uno_ExtEnvironment *);
+
+    pUnoI->acquire(pUnoI);
+    pEnv->registerInterface(pEnv, reinterpret_cast<void **>(&pUnoI), pOid, pTypeDescr);
+}
+}
+
+Proxy::Proxy(uno::Mapping                          to_from,
+             uno_Environment                     * pTo,
+             uno_Environment                     * pFrom,
+             uno_Interface                       * pUnoI,
+             typelib_InterfaceTypeDescription    * pTypeDescr,
+             OUString                      const & rOId,
+             cppu::helper::purpenv::ProbeFun     * probeFun,
+             void                                * pProbeContext
+)
+        : m_nRef         (1),
+          m_from         (pFrom),
+          m_to           (pTo),
+          m_from_to      (pFrom, pTo),
+          m_to_from      (std::move(to_from)),
+          m_pUnoI        (pUnoI),
+          m_pTypeDescr   (pTypeDescr),
+          m_aOId         (rOId),
+          m_probeFun     (probeFun),
+          m_pProbeContext(pProbeContext)
+{
+    SAL_INFO("cppu.purpenv", "LIFE: Proxy::Proxy(<>) -> " << this);
+
+    typelib_typedescription_acquire(&m_pTypeDescr->aBase);
+    if (!m_pTypeDescr->aBase.bComplete)
+        typelib_typedescription_complete(reinterpret_cast<typelib_TypeDescription **>(&m_pTypeDescr));
+
+    OSL_ENSURE(m_pTypeDescr->aBase.bComplete, "### type is incomplete!");
+
+    uno_Environment_invoke(m_to.get(), s_acquireAndRegister_v, m_pUnoI, rOId.pData, pTypeDescr, m_to.get());
+
+    // uno_Interface
+    uno_Interface::acquire     = s_Proxy_acquire;
+    uno_Interface::release     = s_Proxy_release;
+    uno_Interface::pDispatcher = s_Proxy_dispatch;
+}
+
+extern "C" { static void s_releaseAndRevoke_v(va_list * pParam)
+{
+    uno_ExtEnvironment * pEnv  = va_arg(*pParam, uno_ExtEnvironment *);
+    uno_Interface      * pUnoI = va_arg(*pParam, uno_Interface *);
+
+    pEnv->revokeInterface(pEnv, pUnoI);
+    pUnoI->release(pUnoI);
+}}
+
+Proxy::~Proxy()
+{
+    SAL_INFO("cppu.purpenv", "LIFE: Proxy::~Proxy() -> " << this);
+
+    uno_Environment_invoke(m_to.get(), s_releaseAndRevoke_v, m_to.get(), m_pUnoI);
+
+    typelib_typedescription_release(&m_pTypeDescr->aBase);
+}
+
+static uno::TypeDescription getAcquireMethod()
+{
+    typelib_TypeDescriptionReference * type_XInterface =
+        * typelib_static_type_getByTypeClass(typelib_TypeClass_INTERFACE);
+
+    typelib_TypeDescription * pTXInterfaceDescr = nullptr;
+    TYPELIB_DANGER_GET    (&pTXInterfaceDescr, type_XInterface);
+    uno::TypeDescription acquire(
+        reinterpret_cast< typelib_InterfaceTypeDescription * >(
+            pTXInterfaceDescr)->ppAllMembers[1]);
+    TYPELIB_DANGER_RELEASE(pTXInterfaceDescr);
+
+    return acquire;
+}
+
+static uno::TypeDescription getReleaseMethod()
+{
+    typelib_TypeDescriptionReference * type_XInterface =
+        * typelib_static_type_getByTypeClass(typelib_TypeClass_INTERFACE);
+
+    typelib_TypeDescription * pTXInterfaceDescr = nullptr;
+    TYPELIB_DANGER_GET    (&pTXInterfaceDescr, type_XInterface);
+    uno::TypeDescription release(
+        reinterpret_cast< typelib_InterfaceTypeDescription * >(
+            pTXInterfaceDescr)->ppAllMembers[2]);
+    TYPELIB_DANGER_RELEASE(pTXInterfaceDescr);
+
+    return release;
+}
+
+static uno::TypeDescription s_acquireMethod(getAcquireMethod());
+static uno::TypeDescription s_releaseMethod(getReleaseMethod());
+
+void Proxy::acquire()
+{
+    if (m_probeFun)
+        m_probeFun(true,
+                   this,
+                   m_pProbeContext,
+                   *typelib_static_type_getByTypeClass(typelib_TypeClass_VOID),
+                   nullptr,
+                   0,
+                   s_acquireMethod.get(),
+                   nullptr,
+                   nullptr,
+                   nullptr);
+
+    if (osl_atomic_increment(&m_nRef) == 1)
+    {
+        // rebirth of proxy zombie
+        void * pThis = this;
+        m_from.get()->pExtEnv->registerProxyInterface(m_from.get()->pExtEnv,
+                                                      &pThis,
+                                                      Proxy_free,
+                                                      m_aOId.pData,
+                                                      m_pTypeDescr);
+        OSL_ASSERT(pThis == this);
+    }
+
+    if (m_probeFun)
+        m_probeFun(false,
+                   this,
+                   m_pProbeContext,
+                   *typelib_static_type_getByTypeClass(typelib_TypeClass_VOID),
+                   nullptr,
+                   0,
+                   s_acquireMethod.get(),
+                   nullptr,
+                   nullptr,
+                   nullptr);
+
+}
+
+void Proxy::release()
+{
+    cppu::helper::purpenv::ProbeFun * probeFun = m_probeFun;
+    void                            * pProbeContext = m_pProbeContext;
+
+    if (m_probeFun)
+        m_probeFun(true,
+                   this,
+                   m_pProbeContext,
+                   *typelib_static_type_getByTypeClass(typelib_TypeClass_VOID),
+                   nullptr,
+                   0,
+                   s_releaseMethod.get(),
+                   nullptr,
+                   nullptr,
+                   nullptr);
+
+    if (osl_atomic_decrement(&m_nRef) == 0)
+        m_from.get()->pExtEnv->revokeInterface(m_from.get()->pExtEnv, this);
+
+    if (probeFun)
+        probeFun(false,
+                 this,
+                 pProbeContext,
+                 *typelib_static_type_getByTypeClass(typelib_TypeClass_VOID),
+                 nullptr,
+                 0,
+                 s_releaseMethod.get(),
+                 nullptr,
+                 nullptr,
+                 nullptr);
+
+}
+
+
+extern "C" {
+static void s_type_destructData_v(va_list * pParam)
+{
+    void * ret = va_arg(*pParam, void *);
+    typelib_TypeDescriptionReference * pReturnTypeRef = va_arg(*pParam, typelib_TypeDescriptionReference *);
+
+    uno_type_destructData(ret, pReturnTypeRef, nullptr);
+}
+
+static void s_dispatcher_v(va_list * pParam)
+{
+    uno_Interface                 * pUnoI       = va_arg(*pParam, uno_Interface *);
+    typelib_TypeDescription const * pMemberType = va_arg(*pParam, typelib_TypeDescription const *);
+    void                          * pReturn     = va_arg(*pParam, void *);
+    void                         ** pArgs       = va_arg(*pParam, void **);
+    uno_Any                      ** ppException = va_arg(*pParam, uno_Any **);
+
+    pUnoI->pDispatcher(pUnoI, pMemberType, pReturn, pArgs, ppException);
+}
+}
+
+void Proxy::dispatch(typelib_TypeDescriptionReference * pReturnTypeRef,
+                     typelib_MethodParameter          * pParams,
+                     sal_Int32                          nParams,
+                     typelib_TypeDescription    const * pMemberType,
+                     void                             * pReturn,
+                     void                             * pArgs[],
+                     uno_Any                         ** ppException)
+{
+    if (m_probeFun)
+        m_probeFun(true,
+                   this,
+                   m_pProbeContext,
+                   pReturnTypeRef,
+                   pParams,
+                   nParams,
+                   pMemberType,
+                   pReturn,
+                   pArgs,
+                   ppException);
+
+    void ** args = static_cast<void **>(alloca( sizeof (void *) * nParams ));
+
+    typelib_TypeDescription * return_td = nullptr;
+    void * ret = pReturn;
+    if (pReturnTypeRef)
+    {
+        TYPELIB_DANGER_GET(&return_td, pReturnTypeRef);
+
+        if (relatesToInterface(return_td))
+            ret = alloca(return_td->nSize);
+
+        TYPELIB_DANGER_RELEASE(return_td);
+    }
+
+    for (sal_Int32 nPos = 0; nPos < nParams; ++ nPos)
+    {
+        typelib_MethodParameter const & param = pParams[nPos];
+        typelib_TypeDescription * td = nullptr;
+        TYPELIB_DANGER_GET( &td, param.pTypeRef );
+        if (relatesToInterface(td))
+        {
+            args[nPos] = alloca(td->nSize);
+            if (param.bIn)
+            {
+                uno_copyAndConvertData(args[nPos], pArgs[nPos], td, m_from_to.get());
+            }
+        }
+        else
+        {
+            args[nPos] = pArgs[nPos];
+        }
+        TYPELIB_DANGER_RELEASE( td );
+    }
+
+    uno_Any exc_data;
+    uno_Any * exc = &exc_data;
+
+    // do the UNO call...
+    uno_Environment_invoke(m_to.get(), s_dispatcher_v, m_pUnoI, pMemberType, ret, args, &exc);
+
+    if (exc == nullptr)
+    {
+        for (sal_Int32 nPos = 0; nPos < nParams; ++ nPos)
+        {
+            if (args[nPos] != pArgs[nPos])
+            {
+                typelib_MethodParameter const & param = pParams[nPos];
+                if (param.bOut)
+                {
+                    if (param.bIn) // is inout
+                    {
+                        uno_type_destructData(pArgs[nPos], param.pTypeRef, nullptr);
+                    }
+                    uno_type_copyAndConvertData(pArgs[ nPos ],
+                                                args[ nPos ],
+                                                param.pTypeRef,
+                                                m_to_from.get());
+                }
+                uno_Environment_invoke(m_to.get(), s_type_destructData_v, args[nPos], param.pTypeRef, 0);
+            }
+        }
+        if (ret != pReturn)
+        {
+            uno_type_copyAndConvertData(pReturn,
+                                        ret,
+                                        pReturnTypeRef,
+                                        m_to_from.get());
+
+            uno_Environment_invoke(m_to.get(), s_type_destructData_v, ret, pReturnTypeRef, 0);
+        }
+
+        *ppException = nullptr;
+    }
+    else // exception occurred
+    {
+        for (sal_Int32 nPos = 0; nPos < nParams; ++ nPos)
+        {
+            if (args[nPos] != pArgs[nPos])
+            {
+                typelib_MethodParameter const & param = pParams[nPos];
+                if (param.bIn)
+                {
+                    uno_Environment_invoke(m_to.get(), s_type_destructData_v, args[nPos], param.pTypeRef, 0);
+                }
+            }
+        }
+
+        uno_type_any_constructAndConvert(*ppException,
+                                         exc->pData,
+                                         exc->pType,
+                                         m_to_from.get());
+
+        // FIXME: need to destruct in m_to
+        uno_any_destruct(exc, nullptr);
+    }
+
+    if (m_probeFun)
+        m_probeFun(false,
+                   this,
+                   m_pProbeContext,
+                   pReturnTypeRef,
+                   pParams,
+                   nParams,
+                   pMemberType,
+                   pReturn,
+                   pArgs,
+                   ppException);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/current.cxx b/cppu/source/threadpool/current.cxx
new file mode 100644
index 000000000..64e6bfb8f
--- /dev/null
+++ b/cppu/source/threadpool/current.cxx
@@ -0,0 +1,210 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <rtl/byteseq.h>
+#include <osl/mutex.hxx>
+
+#include <uno/current_context.h>
+#include <uno/environment.hxx>
+#include <uno/mapping.hxx>
+#include <typelib/typedescription.h>
+
+#include "current.hxx"
+
+
+using namespace ::osl;
+using namespace ::rtl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+
+namespace cppu
+{
+
+static typelib_InterfaceTypeDescription * get_type_XCurrentContext()
+{
+    static typelib_InterfaceTypeDescription* s_type_XCurrentContext = []() {
+        OUString sTypeName("com.sun.star.uno.XCurrentContext");
+        typelib_InterfaceTypeDescription* pTD = nullptr;
+        typelib_TypeDescriptionReference* pMembers[1] = { nullptr };
+        OUString sMethodName0("com.sun.star.uno.XCurrentContext::getValueByName");
+        typelib_typedescriptionreference_new(&pMembers[0], typelib_TypeClass_INTERFACE_METHOD,
+                                             sMethodName0.pData);
+        typelib_typedescription_newInterface(
+            &pTD, sTypeName.pData, 0, 0, 0, 0, 0,
+            *typelib_static_type_getByTypeClass(typelib_TypeClass_INTERFACE), 1, pMembers);
+
+        typelib_typedescription_register(reinterpret_cast<typelib_TypeDescription**>(&pTD));
+        typelib_typedescriptionreference_release(pMembers[0]);
+
+        typelib_InterfaceMethodTypeDescription* pMethod = nullptr;
+        typelib_Parameter_Init aParameters[1];
+        OUString sParamName0("Name");
+        OUString sParamType0("string");
+        aParameters[0].pParamName = sParamName0.pData;
+        aParameters[0].eTypeClass = typelib_TypeClass_STRING;
+        aParameters[0].pTypeName = sParamType0.pData;
+        aParameters[0].bIn = true;
+        aParameters[0].bOut = false;
+        rtl_uString* pExceptions[1];
+        OUString sExceptionName0("com.sun.star.uno.RuntimeException");
+        pExceptions[0] = sExceptionName0.pData;
+        OUString sReturnType0("any");
+        typelib_typedescription_newInterfaceMethod(&pMethod, 3, false, sMethodName0.pData,
+                                                   typelib_TypeClass_ANY, sReturnType0.pData, 1,
+                                                   aParameters, 1, pExceptions);
+        typelib_typedescription_register(reinterpret_cast<typelib_TypeDescription**>(&pMethod));
+        typelib_typedescription_release(&pMethod->aBase.aBase);
+        // another static ref:
+        ++reinterpret_cast<typelib_TypeDescription*>(pTD)->nStaticRefCount;
+        return pTD;
+    }();
+
+    return s_type_XCurrentContext;
+}
+
+IdContainer::IdContainer()
+    : pCurrentContext(nullptr)
+    , pCurrentContextEnv(nullptr)
+    , pLocalThreadId(nullptr)
+    , pCurrentId(nullptr)
+    , nRefCountOfCurrentId(0)
+    , bInit(false)
+{
+}
+
+IdContainer::~IdContainer()
+{
+    if (pCurrentContext)
+    {
+        (*pCurrentContextEnv->releaseInterface)(
+            pCurrentContextEnv, pCurrentContext );
+        (*pCurrentContextEnv->aBase.release)(
+            &pCurrentContextEnv->aBase );
+    }
+    if (bInit)
+    {
+        ::rtl_byte_sequence_release( pLocalThreadId );
+        ::rtl_byte_sequence_release( pCurrentId );
+    }
+}
+
+IdContainer& getIdContainer()
+{
+    static thread_local IdContainer aId;
+    return aId;
+}
+
+}
+
+extern "C" sal_Bool SAL_CALL uno_setCurrentContext(
+    void * pCurrentContext,
+    rtl_uString * pEnvTypeName, void * pEnvContext )
+    SAL_THROW_EXTERN_C()
+{
+    IdContainer& id = getIdContainer();
+
+    // free old one
+    if (id.pCurrentContext)
+    {
+        (*id.pCurrentContextEnv->releaseInterface)(
+            id.pCurrentContextEnv, id.pCurrentContext );
+        (*id.pCurrentContextEnv->aBase.release)(
+            &id.pCurrentContextEnv->aBase );
+        id.pCurrentContextEnv = nullptr;
+
+        id.pCurrentContext = nullptr;
+    }
+
+    if (!pCurrentContext)
+        return true;
+
+    uno_Environment * pEnv = nullptr;
+    ::uno_getEnvironment( &pEnv, pEnvTypeName, pEnvContext );
+    OSL_ASSERT( pEnv && pEnv->pExtEnv );
+    if (pEnv)
+    {
+        if (pEnv->pExtEnv)
+        {
+            id.pCurrentContextEnv = pEnv->pExtEnv;
+            (*id.pCurrentContextEnv->acquireInterface)(
+                id.pCurrentContextEnv, pCurrentContext );
+            id.pCurrentContext = pCurrentContext;
+        }
+        else
+        {
+            (*pEnv->release)( pEnv );
+            return false;
+        }
+    }
+    else
+    {
+        return false;
+    }
+    return true;
+}
+
+extern "C" sal_Bool SAL_CALL uno_getCurrentContext(
+    void ** ppCurrentContext, rtl_uString * pEnvTypeName, void * pEnvContext )
+    SAL_THROW_EXTERN_C()
+{
+    IdContainer& id = getIdContainer();
+
+    Environment target_env;
+
+    // release inout parameter
+    if (*ppCurrentContext)
+    {
+        target_env = Environment(OUString(pEnvTypeName), pEnvContext);
+        OSL_ASSERT( target_env.is() );
+        if (! target_env.is())
+            return false;
+        uno_ExtEnvironment * pEnv = target_env.get()->pExtEnv;
+        OSL_ASSERT( nullptr != pEnv );
+        if (nullptr == pEnv)
+            return false;
+        (*pEnv->releaseInterface)( pEnv, *ppCurrentContext );
+
+        *ppCurrentContext = nullptr;
+    }
+
+    // case: null-ref
+    if (nullptr == id.pCurrentContext)
+        return true;
+
+    if (! target_env.is())
+    {
+        target_env = Environment(OUString(pEnvTypeName), pEnvContext);
+        OSL_ASSERT( target_env.is() );
+        if (! target_env.is())
+            return false;
+    }
+
+    Mapping mapping(&id.pCurrentContextEnv->aBase, target_env.get());
+    OSL_ASSERT( mapping.is() );
+    if (! mapping.is())
+        return false;
+
+    mapping.mapInterface(ppCurrentContext, id.pCurrentContext, ::cppu::get_type_XCurrentContext());
+
+    return true;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/current.hxx b/cppu/source/threadpool/current.hxx
new file mode 100644
index 000000000..1f6ce6642
--- /dev/null
+++ b/cppu/source/threadpool/current.hxx
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <sal/types.h>
+
+struct _uno_ExtEnvironment;
+
+namespace cppu
+{
+struct IdContainer
+{
+    void *               pCurrentContext;
+    _uno_ExtEnvironment * pCurrentContextEnv;
+
+    sal_Sequence *      pLocalThreadId;
+    sal_Sequence *      pCurrentId;
+    sal_Int32           nRefCountOfCurrentId;
+    bool                bInit;
+
+    IdContainer();
+    ~IdContainer();
+};
+
+IdContainer& getIdContainer();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/jobqueue.cxx b/cppu/source/threadpool/jobqueue.cxx
new file mode 100644
index 000000000..1be424024
--- /dev/null
+++ b/cppu/source/threadpool/jobqueue.cxx
@@ -0,0 +1,177 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cassert>
+
+#include "jobqueue.hxx"
+#include "threadpool.hxx"
+
+namespace cppu_threadpool {
+
+    JobQueue::JobQueue() :
+        m_nToDo( 0 ),
+        m_bSuspended( false ),
+        m_DisposedCallerAdmin( DisposedCallerAdmin::getInstance() )
+    {
+    }
+
+    void JobQueue::add( void *pThreadSpecificData, RequestFun * doRequest )
+    {
+        std::scoped_lock guard( m_mutex );
+        Job job = { pThreadSpecificData , doRequest };
+        m_lstJob.push_back( job );
+        if( ! m_bSuspended )
+        {
+            m_cndWait.notify_all();
+        }
+        m_nToDo ++;
+    }
+
+    void *JobQueue::enter( void const * nDisposeId , bool bReturnWhenNoJob )
+    {
+        void *pReturn = nullptr;
+        {
+            // synchronize with the dispose calls
+            std::scoped_lock guard( m_mutex );
+            if( m_DisposedCallerAdmin->isDisposed( nDisposeId ) )
+            {
+                return nullptr;
+            }
+            m_lstCallstack.push_front( nDisposeId );
+        }
+
+
+        while( true )
+        {
+            struct Job job={nullptr,nullptr};
+            {
+                std::unique_lock guard( m_mutex );
+
+                while (m_bSuspended
+                       || (m_lstCallstack.front() != nullptr && !bReturnWhenNoJob
+                           && m_lstJob.empty()))
+                {
+                    m_cndWait.wait(guard);
+                }
+
+                if( nullptr == m_lstCallstack.front() )
+                {
+                    // disposed !
+                    if (!m_lstJob.empty() && m_lstJob.front().doRequest == nullptr) {
+                        // If this thread was waiting for a remote response, that response may or
+                        // may not have been enqueued; if it has not been enqueued, there cannot be
+                        // another enqueued response, so it is always correct to remove any enqueued
+                        // response here:
+                        m_lstJob.pop_front();
+                    }
+                    break;
+                }
+
+                if( m_lstJob.empty() )
+                {
+                    assert(bReturnWhenNoJob);
+                    break;
+                }
+
+                job = m_lstJob.front();
+                m_lstJob.pop_front();
+            }
+
+            if( job.doRequest )
+            {
+                job.doRequest( job.pThreadSpecificData );
+                std::scoped_lock guard( m_mutex );
+                m_nToDo --;
+            }
+            else
+            {
+                pReturn = job.pThreadSpecificData;
+                std::scoped_lock guard( m_mutex );
+                m_nToDo --;
+                break;
+            }
+        }
+
+        {
+            // synchronize with the dispose calls
+            std::scoped_lock guard( m_mutex );
+            m_lstCallstack.pop_front();
+        }
+
+        return pReturn;
+    }
+
+    void JobQueue::dispose( void const * nDisposeId )
+    {
+        std::scoped_lock guard( m_mutex );
+        for( auto& rId : m_lstCallstack )
+        {
+            if( rId == nDisposeId )
+            {
+                rId = nullptr;
+            }
+        }
+
+        if( !m_lstCallstack.empty()  && ! m_lstCallstack.front() )
+        {
+            // The thread is waiting for a disposed pCallerId, let it go
+            m_cndWait.notify_all();
+        }
+    }
+
+    void JobQueue::suspend()
+    {
+        std::scoped_lock guard( m_mutex );
+        m_bSuspended = true;
+    }
+
+    void JobQueue::resume()
+    {
+        std::scoped_lock guard( m_mutex );
+        m_bSuspended = false;
+        if( ! m_lstJob.empty() )
+        {
+            m_cndWait.notify_all();
+        }
+    }
+
+    bool JobQueue::isEmpty() const
+    {
+        std::scoped_lock guard( m_mutex );
+        return m_lstJob.empty();
+    }
+
+    bool JobQueue::isCallstackEmpty() const
+    {
+        std::scoped_lock guard( m_mutex );
+        return m_lstCallstack.empty();
+    }
+
+    bool JobQueue::isBusy() const
+    {
+        std::scoped_lock guard( m_mutex );
+        return m_nToDo > 0;
+    }
+
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/jobqueue.hxx b/cppu/source/threadpool/jobqueue.hxx
new file mode 100644
index 000000000..5b92f2476
--- /dev/null
+++ b/cppu/source/threadpool/jobqueue.hxx
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <condition_variable>
+#include <deque>
+#include <memory>
+#include <mutex>
+
+#include <sal/types.h>
+
+namespace cppu_threadpool
+{
+    extern "C" typedef void (RequestFun)(void *);
+
+    struct Job
+    {
+        void *pThreadSpecificData;
+        RequestFun * doRequest;
+    };
+
+    class DisposedCallerAdmin;
+    typedef std::shared_ptr<DisposedCallerAdmin> DisposedCallerAdminHolder;
+
+    class JobQueue
+    {
+    public:
+        JobQueue();
+
+        void add( void *pThreadSpecificData, RequestFun * doRequest );
+
+        void *enter( void const * nDisposeId , bool bReturnWhenNoJob = false );
+        void dispose( void const * nDisposeId );
+
+        void suspend();
+        void resume();
+
+        bool isEmpty() const;
+        bool isCallstackEmpty() const;
+        bool isBusy() const;
+
+    private:
+        mutable std::mutex m_mutex;
+        std::deque < struct Job > m_lstJob;
+        std::deque<void const *>  m_lstCallstack;
+        sal_Int32 m_nToDo;
+        bool m_bSuspended;
+        std::condition_variable m_cndWait;
+        DisposedCallerAdminHolder m_DisposedCallerAdmin;
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/thread.cxx b/cppu/source/threadpool/thread.cxx
new file mode 100644
index 000000000..56e52838b
--- /dev/null
+++ b/cppu/source/threadpool/thread.cxx
@@ -0,0 +1,198 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <algorithm>
+#include <cstdlib>
+#include <osl/diagnose.h>
+#include <uno/threadpool.h>
+#include <sal/log.hxx>
+#include <utility>
+
+#include "thread.hxx"
+#include "jobqueue.hxx"
+#include "threadpool.hxx"
+
+using namespace osl;
+using namespace rtl;
+
+namespace cppu_threadpool {
+
+
+    ThreadAdmin::ThreadAdmin(): m_disposed(false) {}
+
+    ThreadAdmin::~ThreadAdmin()
+    {
+        SAL_WARN_IF(m_deque.size(), "cppu.threadpool", m_deque.size() << "Threads left");
+    }
+
+    bool ThreadAdmin::add_locked( rtl::Reference< ORequestThread > const & p )
+    {
+        if( m_disposed )
+        {
+            return false;
+        }
+        m_deque.push_back( p );
+        return true;
+    }
+
+    void ThreadAdmin::remove_locked( rtl::Reference< ORequestThread > const & p )
+    {
+        m_deque.erase(std::find( m_deque.begin(), m_deque.end(), p ), m_deque.end());
+    }
+
+    void ThreadAdmin::remove( rtl::Reference< ORequestThread > const & p )
+    {
+        std::scoped_lock aGuard( m_mutex );
+        remove_locked( p );
+    }
+
+    void ThreadAdmin::join()
+    {
+        {
+            std::scoped_lock aGuard( m_mutex );
+            m_disposed = true;
+        }
+        for (;;)
+        {
+            rtl::Reference< ORequestThread > pCurrent;
+            {
+                std::scoped_lock aGuard( m_mutex );
+                if( m_deque.empty() )
+                {
+                    break;
+                }
+                pCurrent = m_deque.front();
+                m_deque.pop_front();
+            }
+            if (pCurrent->getIdentifier()
+                != osl::Thread::getCurrentIdentifier())
+            {
+                pCurrent->join();
+            }
+        }
+    }
+
+
+    ORequestThread::ORequestThread( ThreadPoolHolder aThreadPool,
+                                    JobQueue *pQueue,
+                                    ByteSequence aThreadId,
+                                    bool bAsynchron )
+        : m_aThreadPool(std::move( aThreadPool ))
+        , m_pQueue( pQueue )
+        , m_aThreadId(std::move( aThreadId ))
+        , m_bAsynchron( bAsynchron )
+    {}
+
+    ORequestThread::~ORequestThread() {}
+
+    void ORequestThread::setTask( JobQueue *pQueue,
+                                  const ByteSequence &aThreadId,
+                                  bool bAsynchron )
+    {
+        m_pQueue = pQueue;
+        m_aThreadId = aThreadId;
+        m_bAsynchron = bAsynchron;
+    }
+
+    bool ORequestThread::launch()
+    {
+        // Assumption is that osl::Thread::create returns normally with a true
+        // return value iff it causes osl::Thread::run to start executing:
+        acquire();
+        ThreadAdmin & rThreadAdmin = m_aThreadPool->getThreadAdmin();
+        std::unique_lock g(rThreadAdmin.m_mutex);
+        if (!rThreadAdmin.add_locked( this )) {
+            return false;
+        }
+        try {
+            if (!create()) {
+                std::abort();
+            }
+        } catch (...) {
+            rThreadAdmin.remove_locked( this );
+            g.release();
+            release();
+            throw;
+        }
+        return true;
+    }
+
+    void ORequestThread::onTerminated()
+    {
+        m_aThreadPool->getThreadAdmin().remove( this );
+        release();
+    }
+
+    void ORequestThread::run()
+    {
+        osl_setThreadName("cppu_threadpool::ORequestThread");
+
+        try
+        {
+            while ( m_pQueue )
+            {
+                if( ! m_bAsynchron )
+                {
+                    if ( !uno_bindIdToCurrentThread( m_aThreadId.getHandle() ) )
+                    {
+                        OSL_ASSERT( false );
+                    }
+                }
+
+                while( ! m_pQueue->isEmpty() )
+                {
+                    // Note : Oneways should not get a disposable disposeid,
+                    //        It does not make sense to dispose a call in this state.
+                    //        That's way we put it a disposeid, that can't be used otherwise.
+                    m_pQueue->enter(
+                        this,
+                        true );
+
+                    if( m_pQueue->isEmpty() )
+                    {
+                        m_aThreadPool->revokeQueue( m_aThreadId , m_bAsynchron );
+                        // Note : revokeQueue might have failed because m_pQueue.isEmpty()
+                        //        may be false (race).
+                    }
+                }
+
+                delete m_pQueue;
+                m_pQueue = nullptr;
+
+                if( ! m_bAsynchron )
+                {
+                    uno_releaseIdFromCurrentThread();
+                }
+
+                m_aThreadPool->waitInPool( this );
+            }
+        }
+        catch (...)
+        {
+            // Work around the problem that onTerminated is not called if run
+            // throws an exception:
+            onTerminated();
+            throw;
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/thread.hxx b/cppu/source/threadpool/thread.hxx
new file mode 100644
index 000000000..5d03de88e
--- /dev/null
+++ b/cppu/source/threadpool/thread.hxx
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <osl/thread.hxx>
+#include <sal/types.h>
+#include <salhelper/simplereferenceobject.hxx>
+
+#include "threadpool.hxx"
+
+namespace cppu_threadpool {
+
+    class JobQueue;
+
+
+    // private thread class for the threadpool
+
+    class ORequestThread:
+        public salhelper::SimpleReferenceObject, public osl::Thread
+    {
+    public:
+        ORequestThread( ThreadPoolHolder aThreadPool,
+                        JobQueue * ,
+                        ::rtl::ByteSequence aThreadId,
+                        bool bAsynchron );
+        virtual ~ORequestThread() override;
+
+        void setTask( JobQueue * , const ::rtl::ByteSequence & aThreadId , bool bAsynchron );
+
+        bool launch();
+
+        static void * operator new(std::size_t size)
+        { return SimpleReferenceObject::operator new(size); }
+
+        static void operator delete(void * pointer)
+        { SimpleReferenceObject::operator delete(pointer); }
+
+    private:
+        virtual void SAL_CALL run() override;
+        virtual void SAL_CALL onTerminated() override;
+
+        ThreadPoolHolder m_aThreadPool;
+        JobQueue *m_pQueue;
+        ::rtl::ByteSequence m_aThreadId;
+        bool m_bAsynchron;
+    };
+
+} // end cppu_threadpool
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/threadident.cxx b/cppu/source/threadpool/threadident.cxx
new file mode 100644
index 000000000..16b7c0b27
--- /dev/null
+++ b/cppu/source/threadpool/threadident.cxx
@@ -0,0 +1,120 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <osl/thread.hxx>
+#include <osl/diagnose.h>
+
+#include <rtl/process.h>
+#include <rtl/byteseq.hxx>
+
+#include <uno/threadpool.h>
+
+#include "current.hxx"
+
+using namespace ::std;
+using namespace ::osl;
+using namespace ::cppu;
+
+static void createLocalId( sal_Sequence **ppThreadId )
+{
+    rtl_byte_sequence_constructNoDefault( ppThreadId , 4 + 16 );
+    sal_uInt32 id = osl::Thread::getCurrentIdentifier();
+    (*ppThreadId)->elements[0] = id & 0xFF;
+    (*ppThreadId)->elements[1] = (id >> 8) & 0xFF;
+    (*ppThreadId)->elements[2] = (id >> 16) & 0xFF;
+    (*ppThreadId)->elements[3] = (id >> 24) & 0xFF;
+    rtl_getGlobalProcessId( reinterpret_cast<sal_uInt8 *>(&(*ppThreadId)->elements[4]) );
+}
+
+extern "C" void SAL_CALL
+uno_getIdOfCurrentThread( sal_Sequence **ppThreadId )
+    SAL_THROW_EXTERN_C()
+{
+    IdContainer& id = getIdContainer();
+    if (!id.bInit)
+    {
+        // first time, that the thread enters the bridge
+        createLocalId( ppThreadId );
+
+        // TODO
+        // note : this is a leak !
+        id.pLocalThreadId = *ppThreadId;
+        id.pCurrentId = *ppThreadId;
+        id.nRefCountOfCurrentId = 1;
+        rtl_byte_sequence_acquire( id.pLocalThreadId );
+        rtl_byte_sequence_acquire( id.pCurrentId );
+        id.bInit = true;
+    }
+    else
+    {
+        id.nRefCountOfCurrentId ++;
+        if( *ppThreadId )
+        {
+            rtl_byte_sequence_release( *ppThreadId );
+        }
+        *ppThreadId = id.pCurrentId;
+        rtl_byte_sequence_acquire( *ppThreadId );
+    }
+}
+
+extern "C" void SAL_CALL uno_releaseIdFromCurrentThread()
+    SAL_THROW_EXTERN_C()
+{
+    IdContainer& id = getIdContainer();
+    OSL_ASSERT( id.bInit );
+    OSL_ASSERT( id.nRefCountOfCurrentId );
+
+    id.nRefCountOfCurrentId --;
+    if( ! id.nRefCountOfCurrentId && (id.pLocalThreadId != id.pCurrentId) )
+    {
+        rtl_byte_sequence_assign( &(id.pCurrentId) , id.pLocalThreadId );
+    }
+}
+
+extern "C" sal_Bool SAL_CALL uno_bindIdToCurrentThread( sal_Sequence *pThreadId )
+    SAL_THROW_EXTERN_C()
+{
+    IdContainer& id = getIdContainer();
+    if (!id.bInit)
+    {
+        id.pLocalThreadId = nullptr;
+        createLocalId( &(id.pLocalThreadId) );
+        id.nRefCountOfCurrentId = 1;
+        id.pCurrentId = pThreadId;
+        rtl_byte_sequence_acquire(id.pCurrentId);
+        id.bInit = true;
+    }
+    else
+    {
+        OSL_ASSERT( 0 == id.nRefCountOfCurrentId );
+        if( 0 == id.nRefCountOfCurrentId )
+        {
+            rtl_byte_sequence_assign(&( id.pCurrentId ), pThreadId );
+            id.nRefCountOfCurrentId ++;
+        }
+        else
+        {
+            return false;
+        }
+
+    }
+    return true;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/threadpool.cxx b/cppu/source/threadpool/threadpool.cxx
new file mode 100644
index 000000000..897bebed9
--- /dev/null
+++ b/cppu/source/threadpool/threadpool.cxx
@@ -0,0 +1,476 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cassert>
+#include <chrono>
+#include <algorithm>
+#include <utility>
+#include <unordered_map>
+
+#include <osl/diagnose.h>
+#include <sal/log.hxx>
+
+#include <uno/threadpool.h>
+
+#include "threadpool.hxx"
+#include "thread.hxx"
+
+using namespace ::std;
+using namespace ::osl;
+using namespace ::rtl;
+
+namespace cppu_threadpool
+{
+    WaitingThread::WaitingThread(
+        rtl::Reference<ORequestThread> theThread): thread(std::move(theThread))
+    {}
+
+    DisposedCallerAdminHolder const & DisposedCallerAdmin::getInstance()
+    {
+        static DisposedCallerAdminHolder theDisposedCallerAdmin =  std::make_shared<DisposedCallerAdmin>();
+        return theDisposedCallerAdmin;
+    }
+
+    DisposedCallerAdmin::~DisposedCallerAdmin()
+    {
+        SAL_WARN_IF( !m_vector.empty(), "cppu.threadpool", "DisposedCallerList :  " << m_vector.size() << " left");
+    }
+
+    void DisposedCallerAdmin::dispose( void const * nDisposeId )
+    {
+        std::scoped_lock guard( m_mutex );
+        m_vector.push_back( nDisposeId );
+    }
+
+    void DisposedCallerAdmin::destroy( void const * nDisposeId )
+    {
+        std::scoped_lock guard( m_mutex );
+        m_vector.erase(std::remove(m_vector.begin(), m_vector.end(), nDisposeId), m_vector.end());
+    }
+
+    bool DisposedCallerAdmin::isDisposed( void const * nDisposeId )
+    {
+        std::scoped_lock guard( m_mutex );
+        return (std::find(m_vector.begin(), m_vector.end(), nDisposeId) != m_vector.end());
+    }
+
+
+    ThreadPool::ThreadPool() :
+        m_DisposedCallerAdmin( DisposedCallerAdmin::getInstance() )
+    {
+    }
+
+    ThreadPool::~ThreadPool()
+    {
+        SAL_WARN_IF( m_mapQueue.size(), "cppu.threadpool", "ThreadIdHashMap:  " << m_mapQueue.size() << " left");
+    }
+
+    void ThreadPool::dispose( void const * nDisposeId )
+    {
+        m_DisposedCallerAdmin->dispose( nDisposeId );
+
+        std::scoped_lock guard( m_mutex );
+        for (auto const& item :  m_mapQueue)
+        {
+            if( item.second.first )
+            {
+                item.second.first->dispose( nDisposeId );
+            }
+            if( item.second.second )
+            {
+                item.second.second->dispose( nDisposeId );
+            }
+        }
+    }
+
+    void ThreadPool::destroy( void const * nDisposeId )
+    {
+        m_DisposedCallerAdmin->destroy( nDisposeId );
+    }
+
+    /******************
+     * This methods lets the thread wait a certain amount of time. If within this timespan
+     * a new request comes in, this thread is reused. This is done only to improve performance,
+     * it is not required for threadpool functionality.
+     ******************/
+    void ThreadPool::waitInPool( rtl::Reference< ORequestThread > const & pThread )
+    {
+        WaitingThread waitingThread(pThread);
+        {
+            std::scoped_lock guard( m_mutexWaitingThreadList );
+            m_dequeThreads.push_front( &waitingThread );
+        }
+
+        // let the thread wait 2 seconds
+        waitingThread.condition.wait( std::chrono::seconds(2) );
+
+        {
+            std::scoped_lock guard ( m_mutexWaitingThreadList );
+            if( waitingThread.thread.is() )
+            {
+                // thread wasn't reused, remove it from the list
+                WaitingThreadDeque::iterator ii = find(
+                    m_dequeThreads.begin(), m_dequeThreads.end(), &waitingThread );
+                OSL_ASSERT( ii != m_dequeThreads.end() );
+                m_dequeThreads.erase( ii );
+            }
+        }
+    }
+
+    void ThreadPool::joinWorkers()
+    {
+        {
+            std::scoped_lock guard( m_mutexWaitingThreadList );
+            for (auto const& thread : m_dequeThreads)
+            {
+                // wake the threads up
+                thread->condition.set();
+            }
+        }
+        m_aThreadAdmin.join();
+    }
+
+    bool ThreadPool::createThread( JobQueue *pQueue ,
+                                   const ByteSequence &aThreadId,
+                                   bool bAsynchron )
+    {
+        {
+            // Can a thread be reused ?
+            std::scoped_lock guard( m_mutexWaitingThreadList );
+            if( ! m_dequeThreads.empty() )
+            {
+                // inform the thread and let it go
+                struct WaitingThread *pWaitingThread = m_dequeThreads.back();
+                pWaitingThread->thread->setTask( pQueue , aThreadId , bAsynchron );
+                pWaitingThread->thread = nullptr;
+
+                // remove from list
+                m_dequeThreads.pop_back();
+
+                // let the thread go
+                pWaitingThread->condition.set();
+                return true;
+            }
+        }
+
+        rtl::Reference pThread(
+            new ORequestThread( this, pQueue , aThreadId, bAsynchron) );
+        return pThread->launch();
+    }
+
+    bool ThreadPool::revokeQueue( const ByteSequence &aThreadId, bool bAsynchron )
+    {
+        std::scoped_lock guard( m_mutex );
+
+        ThreadIdHashMap::iterator ii = m_mapQueue.find( aThreadId );
+        OSL_ASSERT( ii != m_mapQueue.end() );
+
+        if( bAsynchron )
+        {
+            if( ! (*ii).second.second->isEmpty() )
+            {
+                // another thread has put something into the queue
+                return false;
+            }
+
+            (*ii).second.second = nullptr;
+            if( (*ii).second.first )
+            {
+                // all oneway request have been processed, now
+                // synchronous requests may go on
+                (*ii).second.first->resume();
+            }
+        }
+        else
+        {
+            if( ! (*ii).second.first->isEmpty() )
+            {
+                // another thread has put something into the queue
+                return false;
+            }
+            (*ii).second.first = nullptr;
+        }
+
+        if( nullptr == (*ii).second.first && nullptr == (*ii).second.second )
+        {
+            m_mapQueue.erase( ii );
+        }
+
+        return true;
+    }
+
+
+    bool ThreadPool::addJob(
+        const ByteSequence &aThreadId ,
+        bool bAsynchron,
+        void *pThreadSpecificData,
+        RequestFun * doRequest,
+        void const * disposeId )
+    {
+        bool bCreateThread = false;
+        JobQueue *pQueue = nullptr;
+        {
+            std::scoped_lock guard( m_mutex );
+            if (m_DisposedCallerAdmin->isDisposed(disposeId)) {
+                return true;
+            }
+
+            ThreadIdHashMap::iterator ii = m_mapQueue.find( aThreadId );
+
+            if( ii == m_mapQueue.end() )
+            {
+                m_mapQueue[ aThreadId ] = pair < JobQueue * , JobQueue * > ( nullptr , nullptr );
+                ii = m_mapQueue.find( aThreadId );
+                OSL_ASSERT( ii != m_mapQueue.end() );
+            }
+
+            if( bAsynchron )
+            {
+                if( ! (*ii).second.second )
+                {
+                    (*ii).second.second = new JobQueue();
+                    bCreateThread = true;
+                }
+                pQueue = (*ii).second.second;
+            }
+            else
+            {
+                if( ! (*ii).second.first )
+                {
+                    (*ii).second.first = new JobQueue();
+                    bCreateThread = true;
+                }
+                pQueue = (*ii).second.first;
+
+                if( (*ii).second.second && ( (*ii).second.second->isBusy() ) )
+                {
+                    pQueue->suspend();
+                }
+            }
+            pQueue->add( pThreadSpecificData , doRequest );
+        }
+
+        return !bCreateThread || createThread( pQueue , aThreadId , bAsynchron);
+    }
+
+    void ThreadPool::prepare( const ByteSequence &aThreadId )
+    {
+        std::scoped_lock guard( m_mutex );
+
+        ThreadIdHashMap::iterator ii = m_mapQueue.find( aThreadId );
+
+        if( ii == m_mapQueue.end() )
+        {
+            JobQueue *p = new JobQueue();
+            m_mapQueue[ aThreadId ] = pair< JobQueue * , JobQueue * > ( p , nullptr );
+        }
+        else if( nullptr == (*ii).second.first )
+        {
+            (*ii).second.first = new JobQueue();
+        }
+    }
+
+    void * ThreadPool::enter( const ByteSequence & aThreadId , void const * nDisposeId )
+    {
+        JobQueue *pQueue = nullptr;
+        {
+            std::scoped_lock guard( m_mutex );
+
+            ThreadIdHashMap::iterator ii = m_mapQueue.find( aThreadId );
+
+            OSL_ASSERT( ii != m_mapQueue.end() );
+            pQueue = (*ii).second.first;
+        }
+
+        OSL_ASSERT( pQueue );
+        void *pReturn = pQueue->enter( nDisposeId );
+
+        if( pQueue->isCallstackEmpty() )
+        {
+            if( revokeQueue( aThreadId , false) )
+            {
+                // remove queue
+                delete pQueue;
+            }
+        }
+        return pReturn;
+    }
+}
+
+// All uno_ThreadPool handles in g_pThreadpoolHashSet with overlapping life
+// spans share one ThreadPool instance.  When g_pThreadpoolHashSet becomes empty
+// (within the last uno_threadpool_destroy) all worker threads spawned by that
+// ThreadPool instance are joined (which implies that uno_threadpool_destroy
+// must never be called from a worker thread); afterwards, the next call to
+// uno_threadpool_create (if any) will lead to a new ThreadPool instance.
+
+using namespace cppu_threadpool;
+
+namespace {
+
+struct uno_ThreadPool_Equal
+{
+    bool operator () ( const uno_ThreadPool &a , const uno_ThreadPool &b ) const
+        {
+            return a == b;
+        }
+};
+
+struct uno_ThreadPool_Hash
+{
+    std::size_t operator () ( const uno_ThreadPool &a  )  const
+        {
+            return reinterpret_cast<std::size_t>( a );
+        }
+};
+
+}
+
+typedef std::unordered_map< uno_ThreadPool, ThreadPoolHolder, uno_ThreadPool_Hash, uno_ThreadPool_Equal > ThreadpoolHashSet;
+
+static ThreadpoolHashSet *g_pThreadpoolHashSet;
+
+struct _uno_ThreadPool
+{
+    sal_Int32 dummy;
+};
+
+namespace {
+
+ThreadPoolHolder getThreadPool( uno_ThreadPool hPool )
+{
+    MutexGuard guard( Mutex::getGlobalMutex() );
+    assert( g_pThreadpoolHashSet != nullptr );
+    ThreadpoolHashSet::iterator i( g_pThreadpoolHashSet->find(hPool) );
+    assert( i != g_pThreadpoolHashSet->end() );
+    return i->second;
+}
+
+}
+
+extern "C" uno_ThreadPool SAL_CALL
+uno_threadpool_create() SAL_THROW_EXTERN_C()
+{
+    MutexGuard guard( Mutex::getGlobalMutex() );
+    ThreadPoolHolder p;
+    if( ! g_pThreadpoolHashSet )
+    {
+        g_pThreadpoolHashSet = new ThreadpoolHashSet;
+        p = new ThreadPool;
+    }
+    else
+    {
+        assert( !g_pThreadpoolHashSet->empty() );
+        p = g_pThreadpoolHashSet->begin()->second;
+    }
+
+    // Just ensure that the handle is unique in the process (via heap)
+    uno_ThreadPool h = new struct _uno_ThreadPool;
+    g_pThreadpoolHashSet->emplace( h, p );
+    return h;
+}
+
+extern "C" void SAL_CALL
+uno_threadpool_attach( uno_ThreadPool hPool ) SAL_THROW_EXTERN_C()
+{
+    sal_Sequence *pThreadId = nullptr;
+    uno_getIdOfCurrentThread( &pThreadId );
+    getThreadPool( hPool )->prepare( pThreadId );
+    rtl_byte_sequence_release( pThreadId );
+    uno_releaseIdFromCurrentThread();
+}
+
+extern "C" void SAL_CALL
+uno_threadpool_enter( uno_ThreadPool hPool , void **ppJob )
+    SAL_THROW_EXTERN_C()
+{
+    sal_Sequence *pThreadId = nullptr;
+    uno_getIdOfCurrentThread( &pThreadId );
+    *ppJob =
+        getThreadPool( hPool )->enter(
+            pThreadId,
+            hPool );
+    rtl_byte_sequence_release( pThreadId );
+    uno_releaseIdFromCurrentThread();
+}
+
+extern "C" void SAL_CALL
+uno_threadpool_detach(SAL_UNUSED_PARAMETER uno_ThreadPool) SAL_THROW_EXTERN_C()
+{
+    // we might do here some tidying up in case a thread called attach but never detach
+}
+
+extern "C" void SAL_CALL
+uno_threadpool_putJob(
+    uno_ThreadPool hPool,
+    sal_Sequence *pThreadId,
+    void *pJob,
+    void ( SAL_CALL * doRequest ) ( void *pThreadSpecificData ),
+    sal_Bool bIsOneway ) SAL_THROW_EXTERN_C()
+{
+    if (!getThreadPool(hPool)->addJob( pThreadId, bIsOneway, pJob ,doRequest, hPool ))
+    {
+        SAL_WARN(
+            "cppu.threadpool",
+            "uno_threadpool_putJob in parallel with uno_threadpool_destroy");
+    }
+}
+
+extern "C" void SAL_CALL
+uno_threadpool_dispose( uno_ThreadPool hPool ) SAL_THROW_EXTERN_C()
+{
+    getThreadPool(hPool)->dispose(
+        hPool );
+}
+
+extern "C" void SAL_CALL
+uno_threadpool_destroy( uno_ThreadPool hPool ) SAL_THROW_EXTERN_C()
+{
+    ThreadPoolHolder p( getThreadPool(hPool) );
+    p->destroy(
+        hPool );
+
+    bool empty;
+    {
+        OSL_ASSERT( g_pThreadpoolHashSet );
+
+        MutexGuard guard( Mutex::getGlobalMutex() );
+
+        ThreadpoolHashSet::iterator ii = g_pThreadpoolHashSet->find( hPool );
+        OSL_ASSERT( ii != g_pThreadpoolHashSet->end() );
+        g_pThreadpoolHashSet->erase( ii );
+        delete hPool;
+
+        empty = g_pThreadpoolHashSet->empty();
+        if( empty )
+        {
+            delete g_pThreadpoolHashSet;
+            g_pThreadpoolHashSet = nullptr;
+        }
+    }
+
+    if( empty )
+    {
+        p->joinWorkers();
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/threadpool/threadpool.hxx b/cppu/source/threadpool/threadpool.hxx
new file mode 100644
index 000000000..afcae7a7e
--- /dev/null
+++ b/cppu/source/threadpool/threadpool.hxx
@@ -0,0 +1,162 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <mutex>
+#include <vector>
+#include <unordered_map>
+
+#include <osl/conditn.hxx>
+#include <osl/mutex.hxx>
+#include <rtl/byteseq.hxx>
+#include <rtl/ref.hxx>
+#include <salhelper/simplereferenceobject.hxx>
+
+#include "jobqueue.hxx"
+
+
+namespace cppu_threadpool {
+    class ORequestThread;
+
+    struct EqualThreadId
+    {
+        bool operator () ( const ::rtl::ByteSequence &a , const ::rtl::ByteSequence &b ) const
+            {
+                return a == b;
+            }
+    };
+
+    struct HashThreadId
+    {
+        sal_Int32 operator () ( const ::rtl::ByteSequence &a  )  const
+            {
+                if( a.getLength() >= 4 )
+                {
+                    return *reinterpret_cast<sal_Int32 const *>(a.getConstArray());
+                }
+                return 0;
+            }
+    };
+
+    typedef std::unordered_map
+    <
+        ::rtl::ByteSequence, // ThreadID
+        std::pair < JobQueue * , JobQueue * >,
+        HashThreadId,
+        EqualThreadId
+    > ThreadIdHashMap;
+
+    struct WaitingThread
+    {
+        osl::Condition condition;
+        rtl::Reference< ORequestThread > thread;
+
+        explicit WaitingThread(
+            rtl::Reference<ORequestThread> theThread);
+    };
+
+    typedef std::deque< struct ::cppu_threadpool::WaitingThread * > WaitingThreadDeque;
+
+    class DisposedCallerAdmin;
+    typedef std::shared_ptr<DisposedCallerAdmin> DisposedCallerAdminHolder;
+
+    class DisposedCallerAdmin
+    {
+    public:
+        ~DisposedCallerAdmin();
+
+        static DisposedCallerAdminHolder const & getInstance();
+
+        void dispose( void const * nDisposeId );
+        void destroy( void const * nDisposeId );
+        bool isDisposed( void const * nDisposeId );
+
+    private:
+        std::mutex m_mutex;
+        std::vector< void const * > m_vector;
+    };
+
+    class ThreadAdmin
+    {
+    public:
+        ThreadAdmin();
+        ~ThreadAdmin ();
+
+        void remove( rtl::Reference< ORequestThread > const & );
+        void join();
+
+        bool add_locked( rtl::Reference< ORequestThread > const & );
+        void remove_locked( rtl::Reference< ORequestThread > const & );
+        std::mutex m_mutex;
+
+    private:
+        std::deque< rtl::Reference< ORequestThread > > m_deque;
+        bool m_disposed;
+    };
+
+    class ThreadPool;
+    typedef rtl::Reference<ThreadPool> ThreadPoolHolder;
+
+    class ThreadPool: public salhelper::SimpleReferenceObject
+    {
+    public:
+        ThreadPool();
+        virtual ~ThreadPool() override;
+
+        void dispose( void const * nDisposeId );
+        void destroy( void const * nDisposeId );
+
+        bool addJob( const ::rtl::ByteSequence &aThreadId,
+                     bool bAsynchron,
+                     void *pThreadSpecificData,
+                     RequestFun * doRequest,
+                     void const * disposeId );
+
+        void prepare( const ::rtl::ByteSequence &aThreadId );
+        void * enter( const ::rtl::ByteSequence &aThreadId, void const * nDisposeId );
+
+        /********
+         * @return true, if queue could be successfully revoked.
+         ********/
+        bool revokeQueue( const ::rtl::ByteSequence & aThreadId , bool bAsynchron );
+
+        void waitInPool( rtl::Reference< ORequestThread > const & pThread );
+
+        void joinWorkers();
+
+        ThreadAdmin & getThreadAdmin() { return m_aThreadAdmin; }
+
+    private:
+        bool createThread( JobQueue *pQueue, const ::rtl::ByteSequence &aThreadId, bool bAsynchron);
+
+
+        ThreadIdHashMap m_mapQueue;
+        std::mutex m_mutex;
+
+        std::mutex m_mutexWaitingThreadList;
+        WaitingThreadDeque m_dequeThreads;
+
+        DisposedCallerAdminHolder m_DisposedCallerAdmin;
+        ThreadAdmin m_aThreadAdmin;
+    };
+
+} // end namespace cppu_threadpool
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/typelib/static_types.cxx b/cppu/source/typelib/static_types.cxx
new file mode 100644
index 000000000..6b9a35ac9
--- /dev/null
+++ b/cppu/source/typelib/static_types.cxx
@@ -0,0 +1,555 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <algorithm>
+#include <cassert>
+
+#include <osl/mutex.hxx>
+#include <rtl/ustring.hxx>
+
+#include <typelib/typedescription.h>
+#include "typelib.hxx"
+
+
+using namespace osl;
+
+namespace
+{
+    Mutex& typelib_StaticInitMutex()
+    {
+        static Mutex SINGLETON;
+        return SINGLETON;
+    }
+}
+
+extern "C"
+{
+
+
+#ifdef _WIN32
+#pragma pack(push, 8)
+#endif
+
+namespace {
+
+/**
+ * The double member determines the alignment.
+ * Under OS2 and MS-Windows the Alignment is min( 8, sizeof( type ) ).
+ * The alignment of a structure is min( 8, sizeof( max basic type ) ), the greatest basic type
+ * determines the alignment.
+ */
+struct AlignSize_Impl
+{
+    sal_Int16 nInt16;
+#ifdef AIX
+    //double: doubleword aligned if -qalign=natural/-malign=natural
+    //which isn't the default ABI. Otherwise word aligned, While a long long int
+    //is always doubleword aligned, so use that instead.
+    sal_Int64   dDouble;
+#else
+    double dDouble;
+#endif
+};
+
+}
+
+#ifdef _WIN32
+#pragma pack(pop)
+#endif
+
+// the value of the maximal alignment
+const sal_Int32 nMaxAlignment = static_cast<sal_Int32>( reinterpret_cast<sal_Size>(&reinterpret_cast<AlignSize_Impl *>(16)->dDouble) - 16);
+
+static sal_Int32 adjustAlignment( sal_Int32 nRequestedAlignment )
+{
+    if( nRequestedAlignment > nMaxAlignment )
+        nRequestedAlignment = nMaxAlignment;
+    return nRequestedAlignment;
+}
+
+/**
+ * Calculate the new size of the struktur.
+ */
+static sal_Int32 newAlignedSize(
+    sal_Int32 OldSize, sal_Int32 ElementSize, sal_Int32 NeededAlignment )
+{
+    NeededAlignment = adjustAlignment( NeededAlignment );
+    return (OldSize + NeededAlignment -1) / NeededAlignment * NeededAlignment + ElementSize;
+}
+
+
+// !for NOT REALLY WEAK TYPES only!
+static typelib_TypeDescriptionReference * igetTypeByName( rtl_uString const * pTypeName )
+{
+    typelib_TypeDescriptionReference * pRef = nullptr;
+    ::typelib_typedescriptionreference_getByName( &pRef, pTypeName );
+    if (pRef && pRef->pType && pRef->pType->pWeakRef) // found initialized td
+    {
+        return pRef;
+    }
+    return nullptr;
+}
+
+extern "C"
+{
+
+typelib_TypeDescriptionReference ** SAL_CALL typelib_static_type_getByTypeClass(
+    typelib_TypeClass eTypeClass )
+    SAL_THROW_EXTERN_C()
+{
+    static typelib_TypeDescriptionReference * s_aTypes[] = {
+        nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr,
+        nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr,
+        nullptr, nullptr, nullptr };
+
+    if (! s_aTypes[eTypeClass])
+    {
+        MutexGuard aGuard( typelib_StaticInitMutex() );
+        if (! s_aTypes[eTypeClass])
+        {
+            static const char * s_aTypeNames[] = {
+                "void", "char", "boolean", "byte",
+                "short", "unsigned short", "long", "unsigned long",
+                "hyper", "unsigned hyper", "float", "double",
+                "string", "type", "any" };
+
+            switch (eTypeClass)
+            {
+            case typelib_TypeClass_EXCEPTION:
+            case typelib_TypeClass_INTERFACE:
+            {
+                // type
+                if (! s_aTypes[typelib_TypeClass_TYPE])
+                {
+                    OUString sTypeName("type");
+                    ::typelib_typedescriptionreference_new(
+                        &s_aTypes[typelib_TypeClass_TYPE], typelib_TypeClass_TYPE, sTypeName.pData );
+                    // another static ref:
+                    ++s_aTypes[typelib_TypeClass_TYPE]->nStaticRefCount;
+                }
+                // any
+                if (! s_aTypes[typelib_TypeClass_ANY])
+                {
+                    OUString sTypeName("any");
+                    ::typelib_typedescriptionreference_new(
+                        &s_aTypes[typelib_TypeClass_ANY], typelib_TypeClass_ANY, sTypeName.pData );
+                    // another static ref:
+                    ++s_aTypes[typelib_TypeClass_ANY]->nStaticRefCount;
+                }
+                // string
+                if (! s_aTypes[typelib_TypeClass_STRING])
+                {
+                    OUString sTypeName("string");
+                    ::typelib_typedescriptionreference_new(
+                        &s_aTypes[typelib_TypeClass_STRING], typelib_TypeClass_STRING, sTypeName.pData );
+                    // another static ref:
+                    ++s_aTypes[typelib_TypeClass_STRING]->nStaticRefCount;
+                }
+                // XInterface
+                if (! s_aTypes[typelib_TypeClass_INTERFACE])
+                {
+                    OUString sTypeName("com.sun.star.uno.XInterface");
+
+                    typelib_InterfaceTypeDescription * pTD = nullptr;
+
+                    typelib_TypeDescriptionReference * pMembers[3] = { nullptr,nullptr,nullptr };
+                    OUString sMethodName0("com.sun.star.uno.XInterface::queryInterface");
+                    ::typelib_typedescriptionreference_new(
+                        &pMembers[0], typelib_TypeClass_INTERFACE_METHOD, sMethodName0.pData );
+                    OUString sMethodName1("com.sun.star.uno.XInterface::acquire");
+                    ::typelib_typedescriptionreference_new(
+                        &pMembers[1], typelib_TypeClass_INTERFACE_METHOD, sMethodName1.pData );
+                    OUString sMethodName2("com.sun.star.uno.XInterface::release");
+                    ::typelib_typedescriptionreference_new(
+                        &pMembers[2], typelib_TypeClass_INTERFACE_METHOD, sMethodName2.pData );
+
+                    ::typelib_typedescription_newInterface(
+                        &pTD, sTypeName.pData, 0, 0, 0, 0, 0, nullptr, 3, pMembers );
+
+                    ::typelib_typedescription_register( reinterpret_cast<typelib_TypeDescription **>(&pTD) );
+                    s_aTypes[typelib_TypeClass_INTERFACE] = pTD->aBase.pWeakRef;
+                    ::typelib_typedescriptionreference_acquire(
+                        s_aTypes[typelib_TypeClass_INTERFACE] );
+                    // another static ref:
+                    ++s_aTypes[typelib_TypeClass_INTERFACE]->nStaticRefCount;
+                    ::typelib_typedescription_release( &pTD->aBase );
+
+                    ::typelib_typedescriptionreference_release( pMembers[0] );
+                    ::typelib_typedescriptionreference_release( pMembers[1] );
+                    ::typelib_typedescriptionreference_release( pMembers[2] );
+                    // Exception
+                    assert( ! s_aTypes[typelib_TypeClass_EXCEPTION] );
+                    {
+                    typelib_TypeDescription * pTD1 = nullptr;
+                    OUString sTypeName1("com.sun.star.uno.Exception");
+
+                    typelib_CompoundMember_Init aMembers[2];
+                    OUString sMemberType0("string");
+                    OUString sMemberName0("Message");
+                    aMembers[0].eTypeClass = typelib_TypeClass_STRING;
+                    aMembers[0].pTypeName = sMemberType0.pData;
+                    aMembers[0].pMemberName = sMemberName0.pData;
+                    OUString sMemberType1("com.sun.star.uno.XInterface");
+                    OUString sMemberName1("Context");
+                    aMembers[1].eTypeClass = typelib_TypeClass_INTERFACE;
+                    aMembers[1].pTypeName = sMemberType1.pData;
+                    aMembers[1].pMemberName = sMemberName1.pData;
+
+                    ::typelib_typedescription_new(
+                        &pTD1, typelib_TypeClass_EXCEPTION, sTypeName1.pData, nullptr, 2, aMembers );
+                    typelib_typedescription_register( &pTD1 );
+                    s_aTypes[typelib_TypeClass_EXCEPTION] = pTD1->pWeakRef;
+                    typelib_typedescriptionreference_acquire(
+                        s_aTypes[typelib_TypeClass_EXCEPTION]);
+                    // another static ref:
+                    ++s_aTypes[typelib_TypeClass_EXCEPTION]->nStaticRefCount;
+                    // RuntimeException
+                    OUString sTypeName2("com.sun.star.uno.RuntimeException");
+                    ::typelib_typedescription_new(
+                        &pTD1, typelib_TypeClass_EXCEPTION, sTypeName2.pData, s_aTypes[typelib_TypeClass_EXCEPTION], 0, nullptr );
+                    ::typelib_typedescription_register( &pTD1 );
+                    ::typelib_typedescription_release( pTD1 );
+                    }
+                    // XInterface members
+                    typelib_InterfaceMethodTypeDescription * pMethod = nullptr;
+                    typelib_Parameter_Init aParameters[1];
+                    OUString sParamName0("aType");
+                    OUString sParamType0("type");
+                    aParameters[0].pParamName = sParamName0.pData;
+                    aParameters[0].eTypeClass = typelib_TypeClass_TYPE;
+                    aParameters[0].pTypeName = sParamType0.pData;
+                    aParameters[0].bIn = true;
+                    aParameters[0].bOut = false;
+                    rtl_uString * pExceptions[1];
+                    OUString sExceptionName0("com.sun.star.uno.RuntimeException");
+                    pExceptions[0] = sExceptionName0.pData;
+                    OUString sReturnType0("any");
+                    typelib_typedescription_newInterfaceMethod(
+                        &pMethod, 0, false, sMethodName0.pData,
+                        typelib_TypeClass_ANY, sReturnType0.pData,
+                        1, aParameters, 1, pExceptions );
+                    ::typelib_typedescription_register( reinterpret_cast<typelib_TypeDescription**>(&pMethod) );
+
+                    OUString sReturnType1("void");
+                    ::typelib_typedescription_newInterfaceMethod(
+                        &pMethod, 1, true, sMethodName1.pData,
+                        typelib_TypeClass_VOID, sReturnType1.pData, 0, nullptr, 0, nullptr );
+                    ::typelib_typedescription_register( reinterpret_cast<typelib_TypeDescription**>(&pMethod) );
+
+                    ::typelib_typedescription_newInterfaceMethod(
+                        &pMethod, 2, true, sMethodName2.pData,
+                        typelib_TypeClass_VOID, sReturnType1.pData,
+                        0, nullptr, 0, nullptr );
+                    ::typelib_typedescription_register( reinterpret_cast<typelib_TypeDescription**>(&pMethod) );
+                    ::typelib_typedescription_release( &pMethod->aBase.aBase );
+                }
+                break;
+            }
+            default:
+            {
+                OUString aTypeName( OUString::createFromAscii( s_aTypeNames[eTypeClass] ) );
+                ::typelib_typedescriptionreference_new( &s_aTypes[eTypeClass], eTypeClass, aTypeName.pData );
+                // another static ref:
+                ++s_aTypes[eTypeClass]->nStaticRefCount;
+            }
+            }
+        }
+    }
+    return &s_aTypes[eTypeClass];
+}
+
+void SAL_CALL typelib_static_type_init(
+    typelib_TypeDescriptionReference ** ppRef,
+    typelib_TypeClass eTypeClass, const char * pTypeName )
+    SAL_THROW_EXTERN_C()
+{
+    if (! *ppRef)
+    {
+        MutexGuard aGuard( typelib_StaticInitMutex() );
+        if (! *ppRef)
+        {
+            OUString aTypeName( OUString::createFromAscii( pTypeName ) );
+            ::typelib_typedescriptionreference_new( ppRef, eTypeClass, aTypeName.pData );
+
+            assert(*ppRef && "coverity[var_deref_op] - shouldn't be possible");
+            ++((*ppRef)->nStaticRefCount);
+        }
+    }
+}
+
+void SAL_CALL typelib_static_sequence_type_init(
+    typelib_TypeDescriptionReference ** ppRef,
+    typelib_TypeDescriptionReference * pElementType )
+    SAL_THROW_EXTERN_C()
+{
+    if ( *ppRef)
+        return;
+
+    MutexGuard aGuard( typelib_StaticInitMutex() );
+    if ( *ppRef)
+        return;
+
+    OUString aTypeName = "[]" + OUString::unacquired(&pElementType->pTypeName);
+
+    static_assert( ! TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK(typelib_TypeClass_SEQUENCE) );
+    *ppRef = igetTypeByName( aTypeName.pData );
+    if (!*ppRef)
+    {
+        typelib_TypeDescription * pReg = nullptr;
+        ::typelib_typedescription_new(
+            &pReg, typelib_TypeClass_SEQUENCE,
+            aTypeName.pData, pElementType, 0, nullptr );
+
+        ::typelib_typedescription_register( &pReg );
+        *ppRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pReg);
+        assert( *ppRef == pReg->pWeakRef );
+    }
+    // another static ref:
+    ++((*ppRef)->nStaticRefCount);
+}
+
+
+namespace {
+
+void init(
+    typelib_TypeDescriptionReference ** ppRef,
+    typelib_TypeClass eTypeClass, const char * pTypeName,
+    typelib_TypeDescriptionReference * pBaseType,
+    sal_Int32 nMembers, typelib_TypeDescriptionReference ** ppMembers,
+    sal_Bool const * pParameterizedTypes)
+{
+    assert( eTypeClass == typelib_TypeClass_STRUCT || eTypeClass == typelib_TypeClass_EXCEPTION );
+
+    if ( *ppRef)
+        return;
+
+    MutexGuard aGuard( typelib_StaticInitMutex() );
+    if ( *ppRef)
+        return;
+
+    assert( ! TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK(eTypeClass) );
+    OUString aTypeName( OUString::createFromAscii( pTypeName ) );
+    *ppRef = igetTypeByName( aTypeName.pData );
+    if (!*ppRef)
+    {
+        typelib_CompoundTypeDescription * pComp = nullptr;
+        ::typelib_typedescription_newEmpty(
+            reinterpret_cast<typelib_TypeDescription **>(&pComp), eTypeClass, aTypeName.pData );
+
+        sal_Int32 nOffset = 0;
+        if (pBaseType)
+        {
+            ::typelib_typedescriptionreference_getDescription(
+                reinterpret_cast<typelib_TypeDescription **>(&pComp->pBaseTypeDescription), pBaseType );
+            assert( pComp->pBaseTypeDescription );
+            nOffset = pComp->pBaseTypeDescription->aBase.nSize;
+            assert( newAlignedSize( 0, pComp->pBaseTypeDescription->aBase.nSize, pComp->pBaseTypeDescription->aBase.nAlignment ) == pComp->pBaseTypeDescription->aBase.nSize ); // unexpected offset
+        }
+
+        if (nMembers)
+        {
+            pComp->nMembers = nMembers;
+            pComp->pMemberOffsets = new sal_Int32[ nMembers ];
+            pComp->ppTypeRefs = new typelib_TypeDescriptionReference *[ nMembers ];
+            if (pParameterizedTypes != nullptr) {
+                reinterpret_cast< typelib_StructTypeDescription * >(
+                    pComp)->pParameterizedTypes
+                    = new sal_Bool[nMembers];
+            }
+            for ( sal_Int32 i = 0 ; i < nMembers; ++i )
+            {
+                pComp->ppTypeRefs[i] = ppMembers[i];
+                ::typelib_typedescriptionreference_acquire(
+                    pComp->ppTypeRefs[i] );
+                // write offset
+                typelib_TypeDescription * pTD = nullptr;
+                TYPELIB_DANGER_GET( &pTD, pComp->ppTypeRefs[i] );
+                assert( pTD->nSize ); // void member?
+                nOffset = newAlignedSize( nOffset, pTD->nSize, pTD->nAlignment );
+                pComp->pMemberOffsets[i] = nOffset - pTD->nSize;
+                TYPELIB_DANGER_RELEASE( pTD );
+
+                if (pParameterizedTypes != nullptr) {
+                    reinterpret_cast< typelib_StructTypeDescription * >(
+                        pComp)->pParameterizedTypes[i]
+                        = pParameterizedTypes[i];
+                }
+            }
+        }
+
+        typelib_TypeDescription * pReg = &pComp->aBase;
+        pReg->pWeakRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pReg);
+        // sizeof(void) not allowed
+        pReg->nSize = ::typelib_typedescription_getAlignedUnoSize( pReg, 0, pReg->nAlignment );
+        pReg->nAlignment = adjustAlignment( pReg->nAlignment );
+        pReg->bComplete = false;
+
+        ::typelib_typedescription_register( &pReg );
+        *ppRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pReg);
+        assert( *ppRef == pReg->pWeakRef );
+    }
+    // another static ref:
+    ++((*ppRef)->nStaticRefCount);
+}
+
+}
+
+void SAL_CALL typelib_static_compound_type_init(
+    typelib_TypeDescriptionReference ** ppRef,
+    typelib_TypeClass eTypeClass, const char * pTypeName,
+    typelib_TypeDescriptionReference * pBaseType,
+    sal_Int32 nMembers, typelib_TypeDescriptionReference ** ppMembers )
+    SAL_THROW_EXTERN_C()
+{
+    init(ppRef, eTypeClass, pTypeName, pBaseType, nMembers, ppMembers, nullptr);
+}
+
+void SAL_CALL typelib_static_struct_type_init(
+    typelib_TypeDescriptionReference ** ppRef, const char * pTypeName,
+    typelib_TypeDescriptionReference * pBaseType,
+    sal_Int32 nMembers, typelib_TypeDescriptionReference ** ppMembers,
+    sal_Bool const * pParameterizedTypes )
+    SAL_THROW_EXTERN_C()
+{
+    init(
+        ppRef, typelib_TypeClass_STRUCT, pTypeName, pBaseType, nMembers,
+        ppMembers, pParameterizedTypes);
+}
+
+void SAL_CALL typelib_static_interface_type_init(
+    typelib_TypeDescriptionReference ** ppRef,
+    const char * pTypeName,
+    typelib_TypeDescriptionReference * pBaseType )
+    SAL_THROW_EXTERN_C()
+{
+    // coverity[callee_ptr_arith] - not a bug
+    typelib_static_mi_interface_type_init(
+        ppRef, pTypeName, pBaseType == nullptr ? 0 : 1, &pBaseType);
+}
+
+void SAL_CALL typelib_static_mi_interface_type_init(
+    typelib_TypeDescriptionReference ** ppRef,
+    const char * pTypeName,
+    sal_Int32 nBaseTypes,
+    typelib_TypeDescriptionReference ** ppBaseTypes )
+    SAL_THROW_EXTERN_C()
+{
+    if ( *ppRef)
+        return;
+
+    MutexGuard aGuard( typelib_StaticInitMutex() );
+    if ( *ppRef)
+        return;
+
+    static_assert( ! TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK(typelib_TypeClass_INTERFACE) );
+    OUString aTypeName( OUString::createFromAscii( pTypeName ) );
+    *ppRef = igetTypeByName( aTypeName.pData );
+    if (!*ppRef)
+    {
+        typelib_InterfaceTypeDescription * pIface = nullptr;
+        ::typelib_typedescription_newEmpty(
+            reinterpret_cast<typelib_TypeDescription **>(&pIface), typelib_TypeClass_INTERFACE, aTypeName.pData );
+
+        pIface->nBaseTypes = std::max< sal_Int32 >(nBaseTypes, 1);
+        pIface->ppBaseTypes = new typelib_InterfaceTypeDescription *[
+            pIface->nBaseTypes];
+        if (nBaseTypes > 0)
+        {
+            for (sal_Int32 i = 0; i < nBaseTypes; ++i) {
+                pIface->ppBaseTypes[i] = nullptr;
+                ::typelib_typedescriptionreference_getDescription(
+                    reinterpret_cast<typelib_TypeDescription **>(&pIface->ppBaseTypes[i]), ppBaseTypes[i] );
+                assert( pIface->ppBaseTypes[i] );
+            }
+        }
+        else
+        {
+            pIface->ppBaseTypes[0] = nullptr;
+            ::typelib_typedescriptionreference_getDescription(
+                reinterpret_cast<typelib_TypeDescription **>(&pIface->ppBaseTypes[0]),
+                * ::typelib_static_type_getByTypeClass( typelib_TypeClass_INTERFACE ) );
+            assert( pIface->ppBaseTypes[0] );
+        }
+        pIface->pBaseTypeDescription = pIface->ppBaseTypes[0];
+        typelib_typedescription_acquire(
+            &pIface->pBaseTypeDescription->aBase);
+
+        typelib_TypeDescription * pReg = &pIface->aBase;
+        pReg->pWeakRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pReg);
+        // sizeof(void) not allowed
+        pReg->nSize = ::typelib_typedescription_getAlignedUnoSize( pReg, 0, pReg->nAlignment );
+
+        pReg->nAlignment = adjustAlignment( pReg->nAlignment );
+        pReg->bComplete = false;
+
+        ::typelib_typedescription_register( &pReg );
+        *ppRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pReg);
+        assert( *ppRef == pReg->pWeakRef );
+    }
+    // another static ref:
+    ++((*ppRef)->nStaticRefCount);
+}
+
+
+void SAL_CALL typelib_static_enum_type_init(
+    typelib_TypeDescriptionReference ** ppRef,
+    const char * pTypeName,
+    sal_Int32 nDefaultValue )
+    SAL_THROW_EXTERN_C()
+{
+    if ( *ppRef)
+        return;
+
+    MutexGuard aGuard( typelib_StaticInitMutex() );
+    if ( *ppRef)
+        return;
+
+    static_assert( ! TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK(typelib_TypeClass_ENUM) );
+    OUString aTypeName( OUString::createFromAscii( pTypeName ) );
+    *ppRef = igetTypeByName( aTypeName.pData );
+    if (!*ppRef)
+    {
+        typelib_TypeDescription * pReg = nullptr;
+        ::typelib_typedescription_newEmpty(
+            &pReg, typelib_TypeClass_ENUM, aTypeName.pData );
+        typelib_EnumTypeDescription * pEnum = reinterpret_cast<typelib_EnumTypeDescription *>(pReg);
+
+        pEnum->nDefaultEnumValue = nDefaultValue;
+
+        pReg->pWeakRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pReg);
+        // sizeof(void) not allowed
+        pReg->nSize = ::typelib_typedescription_getAlignedUnoSize( pReg, 0, pReg->nAlignment );
+        pReg->nAlignment = ::adjustAlignment( pReg->nAlignment );
+        pReg->bComplete = false;
+
+        ::typelib_typedescription_register( &pReg );
+        *ppRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pReg);
+        assert( *ppRef == pReg->pWeakRef );
+    }
+    // another static ref:
+    ++((*ppRef)->nStaticRefCount);
+}
+
+} // extern "C"
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/typelib/typelib.cxx b/cppu/source/typelib/typelib.cxx
new file mode 100644
index 000000000..293b4e324
--- /dev/null
+++ b/cppu/source/typelib/typelib.cxx
@@ -0,0 +1,2399 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <algorithm>
+#include <unordered_map>
+#include <cassert>
+#include <list>
+#include <set>
+#include <utility>
+#include <vector>
+
+#include <stdlib.h>
+#include <string.h>
+#include <sal/log.hxx>
+#include <osl/interlck.h>
+#include <osl/mutex.hxx>
+#include <rtl/ustring.hxx>
+#include <osl/diagnose.h>
+#include <typelib/typedescription.h>
+#include <uno/any2.h>
+#include <o3tl/string_view.hxx>
+#include "typelib.hxx"
+
+using namespace osl;
+
+#ifdef _WIN32
+#pragma pack(push, 8)
+#endif
+
+namespace {
+
+/**
+ * The double member determines the alignment.
+ * Under OS2 and MS-Windows the Alignment is min( 8, sizeof( type ) ).
+ * The alignment of a structure is min( 8, sizeof( max basic type ) ), the greatest basic type
+ * determines the alignment.
+ */
+struct AlignSize_Impl
+{
+    sal_Int16 nInt16;
+#ifdef AIX
+    //double: doubleword aligned if -qalign=natural/-malign=natural
+    //which isn't the default ABI. Otherwise word aligned, While a long long int
+    //is always doubleword aligned, so use that instead.
+    sal_Int64 dDouble;
+#else
+    double dDouble;
+#endif
+};
+
+}
+
+#ifdef _WIN32
+#pragma pack(pop)
+#endif
+
+// the value of the maximal alignment
+const sal_Int32 nMaxAlignment = static_cast<sal_Int32>( reinterpret_cast<sal_Size>(&reinterpret_cast<AlignSize_Impl *>(16)->dDouble) - 16);
+
+static sal_Int32 adjustAlignment( sal_Int32 nRequestedAlignment )
+{
+    if( nRequestedAlignment > nMaxAlignment )
+        nRequestedAlignment = nMaxAlignment;
+    return nRequestedAlignment;
+}
+
+/**
+ * Calculate the new size of the structure.
+ */
+static sal_Int32 newAlignedSize(
+    sal_Int32 OldSize, sal_Int32 ElementSize, sal_Int32 NeededAlignment )
+{
+    NeededAlignment = adjustAlignment( NeededAlignment );
+    return (OldSize + NeededAlignment -1) / NeededAlignment * NeededAlignment + ElementSize;
+}
+
+static sal_Int32 getDescriptionSize( typelib_TypeClass eTypeClass )
+{
+    OSL_ASSERT( typelib_TypeClass_TYPEDEF != eTypeClass );
+
+    sal_Int32 nSize;
+    // The reference is the description
+    // if the description is empty, then it must be filled with
+    // the new description
+    switch( eTypeClass )
+    {
+        case typelib_TypeClass_SEQUENCE:
+            nSize = sal_Int32(sizeof( typelib_IndirectTypeDescription ));
+        break;
+
+        case typelib_TypeClass_STRUCT:
+            nSize = sal_Int32(sizeof( typelib_StructTypeDescription ));
+        break;
+
+        case typelib_TypeClass_EXCEPTION:
+            nSize = sal_Int32(sizeof( typelib_CompoundTypeDescription ));
+        break;
+
+        case typelib_TypeClass_ENUM:
+            nSize = sal_Int32(sizeof( typelib_EnumTypeDescription ));
+        break;
+
+        case typelib_TypeClass_INTERFACE:
+            nSize = sal_Int32(sizeof( typelib_InterfaceTypeDescription ));
+        break;
+
+        case typelib_TypeClass_INTERFACE_METHOD:
+            nSize = sal_Int32(sizeof( typelib_InterfaceMethodTypeDescription ));
+        break;
+
+        case typelib_TypeClass_INTERFACE_ATTRIBUTE:
+            nSize = sal_Int32(sizeof( typelib_InterfaceAttributeTypeDescription ));
+        break;
+
+        default:
+            nSize = sal_Int32(sizeof( typelib_TypeDescription ));
+    }
+    return nSize;
+}
+
+namespace {
+
+struct equalStr_Impl
+{
+    bool operator()(const sal_Unicode * const & s1, const sal_Unicode * const & s2) const
+        { return 0 == rtl_ustr_compare( s1, s2 ); }
+};
+
+
+struct hashStr_Impl
+{
+    size_t operator()(const sal_Unicode * const & s) const
+        { return rtl_ustr_hashCode( s ); }
+};
+
+}
+
+// Heavy hack, the const sal_Unicode * is hold by the typedescription reference
+typedef std::unordered_map< const sal_Unicode *, typelib_TypeDescriptionReference *,
+                  hashStr_Impl, equalStr_Impl > WeakMap_Impl;
+
+typedef std::pair< void *, typelib_typedescription_Callback > CallbackEntry;
+typedef std::list< CallbackEntry > CallbackSet_Impl;
+typedef std::list< typelib_TypeDescription * > TypeDescriptionList_Impl;
+
+// # of cached elements
+constexpr auto nCacheSize = 256;
+
+namespace {
+
+struct TypeDescriptor_Init_Impl
+{
+    // all type description references
+    WeakMap_Impl maWeakMap;
+    // all type description callbacks
+    CallbackSet_Impl maCallbacks;
+    // A cache to hold descriptions
+    TypeDescriptionList_Impl maCache;
+    // The mutex to guard all type library accesses
+    Mutex      maMutex;
+
+    inline void callChain( typelib_TypeDescription ** ppRet, rtl_uString * pName );
+
+#if OSL_DEBUG_LEVEL > 0
+    // only for debugging
+    sal_Int32 nTypeDescriptionCount = 0;
+    sal_Int32 nCompoundTypeDescriptionCount = 0;
+    sal_Int32 nIndirectTypeDescriptionCount = 0;
+    sal_Int32 nEnumTypeDescriptionCount = 0;
+    sal_Int32 nInterfaceMethodTypeDescriptionCount = 0;
+    sal_Int32 nInterfaceAttributeTypeDescriptionCount = 0;
+    sal_Int32 nInterfaceTypeDescriptionCount = 0;
+    sal_Int32 nTypeDescriptionReferenceCount = 0;
+#endif
+
+    TypeDescriptor_Init_Impl() = default;
+
+    ~TypeDescriptor_Init_Impl();
+};
+
+}
+
+inline void TypeDescriptor_Init_Impl::callChain(
+    typelib_TypeDescription ** ppRet, rtl_uString * pName )
+{
+    assert(ppRet != nullptr);
+    assert(*ppRet == nullptr);
+    for( const CallbackEntry & rEntry : maCallbacks )
+    {
+        (*rEntry.second)( rEntry.first, ppRet, pName );
+        if( *ppRet )
+            return;
+    }
+}
+
+
+TypeDescriptor_Init_Impl::~TypeDescriptor_Init_Impl()
+{
+    for( typelib_TypeDescription* pItem : maCache )
+    {
+        typelib_typedescription_release( pItem );
+    }
+
+    {
+        std::vector< typelib_TypeDescriptionReference * > ppTDR;
+        ppTDR.reserve( maWeakMap.size() );
+
+        // save all weak references
+        for( const auto& rEntry : maWeakMap )
+        {
+            ppTDR.push_back( rEntry.second );
+            typelib_typedescriptionreference_acquire( ppTDR.back() );
+        }
+
+        for( typelib_TypeDescriptionReference * pTDR : ppTDR )
+        {
+            OSL_ASSERT( pTDR->nRefCount > pTDR->nStaticRefCount );
+            pTDR->nRefCount -= pTDR->nStaticRefCount;
+
+            if( pTDR->pType && !pTDR->pType->bOnDemand )
+            {
+                pTDR->pType->bOnDemand = true;
+                typelib_typedescription_release( pTDR->pType );
+            }
+            typelib_typedescriptionreference_release( pTDR );
+        }
+
+#if defined SAL_LOG_INFO
+        for( const auto& rEntry : maWeakMap )
+        {
+            typelib_TypeDescriptionReference * pTDR = rEntry.second;
+            if (pTDR)
+            {
+                OString aTypeName( OUStringToOString( OUString::unacquired(&pTDR->pTypeName), RTL_TEXTENCODING_ASCII_US ) );
+                SAL_INFO("cppu.typelib", "remaining type: " << aTypeName << "; ref count = " << pTDR->nRefCount);
+            }
+            else
+            {
+                SAL_INFO("cppu.typelib", "remaining null type entry!?");
+            }
+        }
+#endif
+    }
+#if OSL_DEBUG_LEVEL > 0
+    SAL_INFO_IF( nTypeDescriptionCount, "cppu.typelib", "nTypeDescriptionCount is not zero" );
+    SAL_INFO_IF( nCompoundTypeDescriptionCount, "cppu.typelib", "nCompoundTypeDescriptionCount is not zero" );
+    SAL_INFO_IF( nIndirectTypeDescriptionCount, "cppu.typelib", "nIndirectTypeDescriptionCount is not zero" );
+    SAL_INFO_IF( nEnumTypeDescriptionCount, "cppu.typelib", "nEnumTypeDescriptionCount is not zero" );
+    SAL_INFO_IF( nInterfaceMethodTypeDescriptionCount, "cppu.typelib", "nInterfaceMethodTypeDescriptionCount is not zero" );
+    SAL_INFO_IF( nInterfaceAttributeTypeDescriptionCount, "cppu.typelib", "nInterfaceAttributeTypeDescriptionCount is not zero" );
+    SAL_INFO_IF( nInterfaceTypeDescriptionCount, "cppu.typelib", "nInterfaceTypeDescriptionCount is not zero" );
+    SAL_INFO_IF( nTypeDescriptionReferenceCount, "cppu.typelib", "nTypeDescriptionReferenceCount is not zero" );
+#endif
+
+    SAL_INFO_IF( !maCallbacks.empty(), "cppu.typelib", "pCallbacks is not NULL or empty" );
+};
+
+namespace {
+TypeDescriptor_Init_Impl& Init()
+{
+    static TypeDescriptor_Init_Impl SINGLETON;
+    return SINGLETON;
+}
+}
+
+extern "C" void SAL_CALL typelib_typedescription_registerCallback(
+    void * pContext, typelib_typedescription_Callback pCallback )
+    SAL_THROW_EXTERN_C()
+{
+    // todo mt safe: guard is no solution, can not acquire while calling callback!
+    TypeDescriptor_Init_Impl &rInit = Init();
+//      OslGuard aGuard( rInit.getMutex() );
+    rInit.maCallbacks.push_back( CallbackEntry( pContext, pCallback ) );
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_revokeCallback(
+    void * pContext, typelib_typedescription_Callback pCallback )
+    SAL_THROW_EXTERN_C()
+{
+    TypeDescriptor_Init_Impl &rInit = Init();
+    {
+        // todo mt safe: guard is no solution, can not acquire while calling callback!
+//          OslGuard aGuard( rInit.getMutex() );
+        CallbackEntry aEntry( pContext, pCallback );
+        rInit.maCallbacks.erase(std::remove(rInit.maCallbacks.begin(), rInit.maCallbacks.end(), aEntry),
+                                rInit.maCallbacks.end());
+    }
+}
+
+static void typelib_typedescription_initTables(
+    typelib_TypeDescription * pTD )
+{
+    typelib_InterfaceTypeDescription * pITD = reinterpret_cast<typelib_InterfaceTypeDescription *>(pTD);
+
+    std::vector<bool> aReadWriteAttributes(pITD->nAllMembers);
+    for ( sal_Int32 i = pITD->nAllMembers; i--; )
+    {
+        aReadWriteAttributes[i] = false;
+        if( typelib_TypeClass_INTERFACE_ATTRIBUTE == pITD->ppAllMembers[i]->eTypeClass )
+        {
+            typelib_TypeDescription * pM = nullptr;
+            TYPELIB_DANGER_GET( &pM, pITD->ppAllMembers[i] );
+            OSL_ASSERT( pM );
+            if (pM)
+            {
+                aReadWriteAttributes[i] = !reinterpret_cast<typelib_InterfaceAttributeTypeDescription *>(pM)->bReadOnly;
+                TYPELIB_DANGER_RELEASE( pM );
+            }
+            else
+            {
+                SAL_INFO( "cppu.typelib", "cannot get attribute type description: " <<  pITD->ppAllMembers[i]->pTypeName );
+            }
+        }
+    }
+
+    MutexGuard aGuard( Init().maMutex );
+    if( pTD->bComplete )
+        return;
+
+    // create the index table from member to function table
+    pITD->pMapMemberIndexToFunctionIndex = new sal_Int32[ pITD->nAllMembers ];
+    sal_Int32 nAdditionalOffset = 0; // +1 for read/write attributes
+    sal_Int32 i;
+    for( i = 0; i < pITD->nAllMembers; i++ )
+    {
+        // index to the get method of the attribute
+        pITD->pMapMemberIndexToFunctionIndex[i] = i + nAdditionalOffset;
+        // extra offset if it is a read/write attribute?
+        if (aReadWriteAttributes[i])
+        {
+            // a read/write attribute
+            nAdditionalOffset++;
+        }
+    }
+
+    // create the index table from function to member table
+    pITD->pMapFunctionIndexToMemberIndex = new sal_Int32[ pITD->nAllMembers + nAdditionalOffset ];
+    nAdditionalOffset = 0; // +1 for read/write attributes
+    for( i = 0; i < pITD->nAllMembers; i++ )
+    {
+        // index to the get method of the attribute
+        pITD->pMapFunctionIndexToMemberIndex[i + nAdditionalOffset] = i;
+        // extra offset if it is a read/write attribute?
+        if (aReadWriteAttributes[i])
+        {
+            // a read/write attribute
+            pITD->pMapFunctionIndexToMemberIndex[i + ++nAdditionalOffset] = i;
+        }
+    }
+    // must be the last action after all initialization is done
+    pITD->nMapFunctionIndexToMemberIndex = pITD->nAllMembers + nAdditionalOffset;
+    pTD->bComplete = true;
+}
+
+namespace {
+
+template<typename T> T * allocTypeDescription() {
+    return reinterpret_cast<T *>(new char[sizeof (T)]);
+}
+
+void freeTypeDescription(typelib_TypeDescription const * desc) {
+    delete[] reinterpret_cast<char const *>(desc);
+}
+
+// In some situations (notably typelib_typedescription_newInterfaceMethod and
+// typelib_typedescription_newInterfaceAttribute), only the members nMembers,
+// ppMembers, nAllMembers, and ppAllMembers of an incomplete interface type
+// description are necessary, but not the additional
+// pMapMemberIndexToFunctionIndex, nMapFunctionIndexToMemberIndex, and
+// pMapFunctionIndexToMemberIndex (which are computed by
+// typelib_typedescription_initTables).  Furthermore, in those situations, it
+// might be illegal to compute those tables, as the creation of the interface
+// member type descriptions would recursively require a complete interface type
+// description.  The parameter initTables controls whether or not to call
+// typelib_typedescription_initTables in those situations.
+bool complete(typelib_TypeDescription ** ppTypeDescr, bool initTables) {
+    if ((*ppTypeDescr)->bComplete)
+        return true;
+
+    OSL_ASSERT( (typelib_TypeClass_STRUCT == (*ppTypeDescr)->eTypeClass ||
+                 typelib_TypeClass_EXCEPTION == (*ppTypeDescr)->eTypeClass ||
+                 typelib_TypeClass_ENUM == (*ppTypeDescr)->eTypeClass ||
+                 typelib_TypeClass_INTERFACE == (*ppTypeDescr)->eTypeClass) &&
+                !TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( (*ppTypeDescr)->eTypeClass ) );
+
+    if (typelib_TypeClass_INTERFACE == (*ppTypeDescr)->eTypeClass &&
+        reinterpret_cast<typelib_InterfaceTypeDescription *>(*ppTypeDescr)->ppAllMembers)
+    {
+        if (initTables) {
+            typelib_typedescription_initTables( *ppTypeDescr );
+        }
+        return true;
+    }
+
+    typelib_TypeDescription * pTD = nullptr;
+    // on demand access of complete td
+    TypeDescriptor_Init_Impl &rInit = Init();
+    rInit.callChain( &pTD, (*ppTypeDescr)->pTypeName );
+    if (pTD)
+    {
+        if (typelib_TypeClass_TYPEDEF == pTD->eTypeClass)
+        {
+            typelib_typedescriptionreference_getDescription(
+                &pTD, reinterpret_cast<typelib_IndirectTypeDescription *>(pTD)->pType );
+            OSL_ASSERT( pTD );
+            if (! pTD)
+                return false;
+        }
+
+        OSL_ASSERT( typelib_TypeClass_TYPEDEF != pTD->eTypeClass );
+        // typedescription found
+        // set to on demand
+        pTD->bOnDemand = true;
+
+        if (pTD->eTypeClass == typelib_TypeClass_INTERFACE
+            && !pTD->bComplete && initTables)
+        {
+            // mandatory info from callback chain
+            OSL_ASSERT( reinterpret_cast<typelib_InterfaceTypeDescription *>(pTD)->ppAllMembers );
+            // complete except of tables init
+            typelib_typedescription_initTables( pTD );
+            pTD->bComplete = true;
+        }
+
+        // The type description is hold by the reference until
+        // on demand is activated.
+        ::typelib_typedescription_register( &pTD ); // replaces incomplete one
+        OSL_ASSERT( pTD == *ppTypeDescr ); // has to merge into existing one
+
+        // insert into the cache
+        MutexGuard aGuard( rInit.maMutex );
+        if( rInit.maCache.size() >= nCacheSize )
+        {
+            typelib_typedescription_release( rInit.maCache.front() );
+            rInit.maCache.pop_front();
+        }
+        // descriptions in the cache must be acquired!
+        typelib_typedescription_acquire( pTD );
+        rInit.maCache.push_back( pTD );
+
+        OSL_ASSERT(
+            pTD->bComplete
+            || (pTD->eTypeClass == typelib_TypeClass_INTERFACE
+                && !initTables));
+
+        ::typelib_typedescription_release( *ppTypeDescr );
+        *ppTypeDescr = pTD;
+    }
+    else
+    {
+        SAL_INFO(
+            "cppu.typelib",
+            "type cannot be completed: " << OUString::unacquired(&(*ppTypeDescr)->pTypeName));
+        return false;
+    }
+    return true;
+}
+
+}
+
+
+extern "C" void typelib_typedescription_newEmpty(
+    typelib_TypeDescription ** ppRet,
+    typelib_TypeClass eTypeClass, rtl_uString * pTypeName )
+    SAL_THROW_EXTERN_C()
+{
+    if( *ppRet )
+    {
+        typelib_typedescription_release( *ppRet );
+        *ppRet = nullptr;
+    }
+
+    OSL_ASSERT( typelib_TypeClass_TYPEDEF != eTypeClass );
+
+    typelib_TypeDescription * pRet;
+    switch( eTypeClass )
+    {
+        case typelib_TypeClass_SEQUENCE:
+        {
+            auto pTmp = allocTypeDescription<typelib_IndirectTypeDescription>();
+            pRet = &pTmp->aBase;
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nIndirectTypeDescriptionCount );
+#endif
+            pTmp->pType = nullptr;
+            // coverity[leaked_storage] - this is on purpose
+        }
+        break;
+
+        case typelib_TypeClass_STRUCT:
+        {
+            // FEATURE_EMPTYCLASS
+            auto pTmp = allocTypeDescription<typelib_StructTypeDescription>();
+            pRet = &pTmp->aBase.aBase;
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nCompoundTypeDescriptionCount );
+#endif
+            pTmp->aBase.pBaseTypeDescription = nullptr;
+            pTmp->aBase.nMembers = 0;
+            pTmp->aBase.pMemberOffsets = nullptr;
+            pTmp->aBase.ppTypeRefs = nullptr;
+            pTmp->aBase.ppMemberNames = nullptr;
+            pTmp->pParameterizedTypes = nullptr;
+            // coverity[leaked_storage] - this is on purpose
+        }
+        break;
+
+        case typelib_TypeClass_EXCEPTION:
+        {
+            // FEATURE_EMPTYCLASS
+            auto pTmp = allocTypeDescription<typelib_CompoundTypeDescription>();
+            pRet = &pTmp->aBase;
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nCompoundTypeDescriptionCount );
+#endif
+            pTmp->pBaseTypeDescription = nullptr;
+            pTmp->nMembers = 0;
+            pTmp->pMemberOffsets = nullptr;
+            pTmp->ppTypeRefs = nullptr;
+            pTmp->ppMemberNames = nullptr;
+            // coverity[leaked_storage] - this is on purpose
+        }
+        break;
+
+        case typelib_TypeClass_ENUM:
+        {
+            auto pTmp = allocTypeDescription<typelib_EnumTypeDescription>();
+            pRet = &pTmp->aBase;
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nEnumTypeDescriptionCount );
+#endif
+            pTmp->nDefaultEnumValue = 0;
+            pTmp->nEnumValues       = 0;
+            pTmp->ppEnumNames       = nullptr;
+            pTmp->pEnumValues       = nullptr;
+            // coverity[leaked_storage] - this is on purpose
+        }
+        break;
+
+        case typelib_TypeClass_INTERFACE:
+        {
+            auto pTmp = allocTypeDescription<
+                typelib_InterfaceTypeDescription>();
+            pRet = &pTmp->aBase;
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nInterfaceTypeDescriptionCount );
+#endif
+            pTmp->pBaseTypeDescription = nullptr;
+            pTmp->nMembers = 0;
+            pTmp->ppMembers = nullptr;
+            pTmp->nAllMembers = 0;
+            pTmp->ppAllMembers = nullptr;
+            pTmp->nMapFunctionIndexToMemberIndex = 0;
+            pTmp->pMapFunctionIndexToMemberIndex = nullptr;
+            pTmp->pMapMemberIndexToFunctionIndex= nullptr;
+            pTmp->nBaseTypes = 0;
+            pTmp->ppBaseTypes = nullptr;
+            // coverity[leaked_storage] - this is on purpose
+        }
+        break;
+
+        case typelib_TypeClass_INTERFACE_METHOD:
+        {
+            auto pTmp = allocTypeDescription<
+                typelib_InterfaceMethodTypeDescription>();
+            pRet = &pTmp->aBase.aBase;
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nInterfaceMethodTypeDescriptionCount );
+#endif
+            pTmp->aBase.pMemberName = nullptr;
+            pTmp->pReturnTypeRef = nullptr;
+            pTmp->nParams = 0;
+            pTmp->pParams = nullptr;
+            pTmp->nExceptions = 0;
+            pTmp->ppExceptions = nullptr;
+            pTmp->pInterface = nullptr;
+            pTmp->pBaseRef = nullptr;
+            pTmp->nIndex = 0;
+            // coverity[leaked_storage] - this is on purpose
+        }
+        break;
+
+        case typelib_TypeClass_INTERFACE_ATTRIBUTE:
+        {
+            auto * pTmp = allocTypeDescription<
+                typelib_InterfaceAttributeTypeDescription>();
+            pRet = &pTmp->aBase.aBase;
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nInterfaceAttributeTypeDescriptionCount );
+#endif
+            pTmp->aBase.pMemberName = nullptr;
+            pTmp->pAttributeTypeRef = nullptr;
+            pTmp->pInterface = nullptr;
+            pTmp->pBaseRef = nullptr;
+            pTmp->nIndex = 0;
+            pTmp->nGetExceptions = 0;
+            pTmp->ppGetExceptions = nullptr;
+            pTmp->nSetExceptions = 0;
+            pTmp->ppSetExceptions = nullptr;
+            // coverity[leaked_storage] - this is on purpose
+        }
+        break;
+
+        default:
+        {
+            pRet = allocTypeDescription<typelib_TypeDescription>();
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_increment( &Init().nTypeDescriptionCount );
+#endif
+        }
+    }
+
+    pRet->nRefCount = 1; // reference count is initially 1
+    pRet->nStaticRefCount = 0;
+    pRet->eTypeClass = eTypeClass;
+    pRet->pUniqueIdentifier = nullptr;
+    pRet->pReserved = nullptr;
+    pRet->pTypeName = pTypeName;
+    rtl_uString_acquire( pRet->pTypeName );
+    pRet->pSelf = pRet;
+    pRet->bComplete = true;
+    pRet->nSize = 0;
+    pRet->nAlignment = 0;
+    pRet->pWeakRef = nullptr;
+    pRet->bOnDemand = false;
+    *ppRet = pRet;
+}
+
+
+namespace {
+
+void newTypeDescription(
+    typelib_TypeDescription ** ppRet, typelib_TypeClass eTypeClass,
+    rtl_uString * pTypeName, typelib_TypeDescriptionReference * pType,
+    sal_Int32 nMembers, typelib_CompoundMember_Init * pCompoundMembers,
+    typelib_StructMember_Init * pStructMembers)
+{
+    OSL_ASSERT(
+        (pCompoundMembers == nullptr || pStructMembers == nullptr)
+        && (pStructMembers == nullptr || eTypeClass == typelib_TypeClass_STRUCT));
+    if (typelib_TypeClass_TYPEDEF == eTypeClass)
+    {
+        SAL_WARN("cppu.typelib", "unexpected typedef!" );
+        typelib_typedescriptionreference_getDescription( ppRet, pType );
+        return;
+    }
+
+    typelib_typedescription_newEmpty( ppRet, eTypeClass, pTypeName );
+
+    switch( eTypeClass )
+    {
+        case typelib_TypeClass_SEQUENCE:
+        {
+            OSL_ASSERT( nMembers == 0 );
+            typelib_typedescriptionreference_acquire( pType );
+            reinterpret_cast<typelib_IndirectTypeDescription *>(*ppRet)->pType = pType;
+        }
+        break;
+
+        case typelib_TypeClass_EXCEPTION:
+        case typelib_TypeClass_STRUCT:
+        {
+            // FEATURE_EMPTYCLASS
+            typelib_CompoundTypeDescription * pTmp = reinterpret_cast<typelib_CompoundTypeDescription*>(*ppRet);
+
+            sal_Int32 nOffset = 0;
+            if( pType )
+            {
+                typelib_typedescriptionreference_getDescription(
+                    reinterpret_cast<typelib_TypeDescription **>(&pTmp->pBaseTypeDescription), pType );
+                nOffset = pTmp->pBaseTypeDescription->aBase.nSize;
+                OSL_ENSURE( newAlignedSize( 0, pTmp->pBaseTypeDescription->aBase.nSize, pTmp->pBaseTypeDescription->aBase.nAlignment ) == pTmp->pBaseTypeDescription->aBase.nSize, "### unexpected offset!" );
+            }
+            if( nMembers )
+            {
+                pTmp->nMembers = nMembers;
+                pTmp->pMemberOffsets = new sal_Int32[ nMembers ];
+                pTmp->ppTypeRefs = new typelib_TypeDescriptionReference *[ nMembers ];
+                pTmp->ppMemberNames = new rtl_uString *[ nMembers ];
+                bool polymorphic = eTypeClass == typelib_TypeClass_STRUCT
+                    && OUString::unacquired(&pTypeName).indexOf('<') >= 0;
+                OSL_ASSERT(!polymorphic || pStructMembers != nullptr);
+                if (polymorphic) {
+                    reinterpret_cast< typelib_StructTypeDescription * >(pTmp)->
+                        pParameterizedTypes = new sal_Bool[nMembers];
+                }
+                for( sal_Int32 i = 0 ; i < nMembers; i++ )
+                {
+                    // read the type and member names
+                    pTmp->ppTypeRefs[i] = nullptr;
+                    if (pCompoundMembers != nullptr) {
+                        typelib_typedescriptionreference_new(
+                            pTmp->ppTypeRefs +i, pCompoundMembers[i].eTypeClass,
+                            pCompoundMembers[i].pTypeName );
+                        pTmp->ppMemberNames[i]
+                            = pCompoundMembers[i].pMemberName;
+                        rtl_uString_acquire( pTmp->ppMemberNames[i] );
+                    } else {
+                        typelib_typedescriptionreference_new(
+                            pTmp->ppTypeRefs +i,
+                            pStructMembers[i].aBase.eTypeClass,
+                            pStructMembers[i].aBase.pTypeName );
+                        pTmp->ppMemberNames[i]
+                            = pStructMembers[i].aBase.pMemberName;
+                        rtl_uString_acquire(pTmp->ppMemberNames[i]);
+                    }
+                    // write offset
+                    sal_Int32 size;
+                    sal_Int32 alignment;
+                    if (pTmp->ppTypeRefs[i]->eTypeClass ==
+                        typelib_TypeClass_SEQUENCE)
+                    {
+                        // Take care of recursion like
+                        // struct S { sequence<S> x; };
+                        size = sizeof(void *);
+                        alignment = adjustAlignment(size);
+                    } else {
+                        typelib_TypeDescription * pTD = nullptr;
+                        TYPELIB_DANGER_GET( &pTD, pTmp->ppTypeRefs[i] );
+                        OSL_ENSURE( pTD->nSize, "### void member?" );
+                        size = pTD->nSize;
+                        alignment = pTD->nAlignment;
+                        TYPELIB_DANGER_RELEASE( pTD );
+                    }
+                    nOffset = newAlignedSize( nOffset, size, alignment );
+                    pTmp->pMemberOffsets[i] = nOffset - size;
+
+                    if (polymorphic) {
+                        reinterpret_cast< typelib_StructTypeDescription * >(
+                            pTmp)->pParameterizedTypes[i]
+                            = pStructMembers[i].bParameterizedType;
+                    }
+                }
+            }
+        }
+        break;
+
+        default:
+        break;
+    }
+
+    if( !TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( eTypeClass ) )
+        (*ppRet)->pWeakRef = reinterpret_cast<typelib_TypeDescriptionReference *>(*ppRet);
+    if( eTypeClass != typelib_TypeClass_VOID )
+    {
+        // sizeof(void) not allowed
+        (*ppRet)->nSize = typelib_typedescription_getAlignedUnoSize( (*ppRet), 0, (*ppRet)->nAlignment );
+        (*ppRet)->nAlignment = adjustAlignment( (*ppRet)->nAlignment );
+    }
+}
+
+}
+
+extern "C" void SAL_CALL typelib_typedescription_new(
+    typelib_TypeDescription ** ppRet,
+    typelib_TypeClass eTypeClass,
+    rtl_uString * pTypeName,
+    typelib_TypeDescriptionReference * pType,
+    sal_Int32 nMembers,
+    typelib_CompoundMember_Init * pMembers )
+    SAL_THROW_EXTERN_C()
+{
+    newTypeDescription(
+        ppRet, eTypeClass, pTypeName, pType, nMembers, pMembers, nullptr);
+}
+
+extern "C" void SAL_CALL typelib_typedescription_newStruct(
+    typelib_TypeDescription ** ppRet,
+    rtl_uString * pTypeName,
+    typelib_TypeDescriptionReference * pType,
+    sal_Int32 nMembers,
+    typelib_StructMember_Init * pMembers )
+    SAL_THROW_EXTERN_C()
+{
+    newTypeDescription(
+        ppRet, typelib_TypeClass_STRUCT, pTypeName, pType, nMembers, nullptr,
+        pMembers);
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_newEnum(
+    typelib_TypeDescription ** ppRet,
+    rtl_uString * pTypeName,
+    sal_Int32 nDefaultValue,
+    sal_Int32 nEnumValues,
+    rtl_uString ** ppEnumNames,
+    sal_Int32 * pEnumValues )
+    SAL_THROW_EXTERN_C()
+{
+    typelib_typedescription_newEmpty( ppRet, typelib_TypeClass_ENUM, pTypeName );
+    typelib_EnumTypeDescription * pEnum = reinterpret_cast<typelib_EnumTypeDescription *>(*ppRet);
+
+    pEnum->nDefaultEnumValue = nDefaultValue;
+    pEnum->nEnumValues       = nEnumValues;
+    pEnum->ppEnumNames       = new rtl_uString * [ nEnumValues ];
+    for ( sal_Int32 nPos = nEnumValues; nPos--; )
+    {
+        pEnum->ppEnumNames[nPos] = ppEnumNames[nPos];
+        rtl_uString_acquire( pEnum->ppEnumNames[nPos] );
+    }
+    pEnum->pEnumValues      = new sal_Int32[ nEnumValues ];
+    ::memcpy( pEnum->pEnumValues, pEnumValues, nEnumValues * sizeof(sal_Int32) );
+
+    static_assert(!TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK(typelib_TypeClass_ENUM));
+    (*ppRet)->pWeakRef = reinterpret_cast<typelib_TypeDescriptionReference *>(*ppRet);
+    // sizeof(void) not allowed
+    (*ppRet)->nSize = typelib_typedescription_getAlignedUnoSize( (*ppRet), 0, (*ppRet)->nAlignment );
+    (*ppRet)->nAlignment = adjustAlignment( (*ppRet)->nAlignment );
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_newInterface(
+    typelib_InterfaceTypeDescription ** ppRet,
+    rtl_uString * pTypeName,
+    SAL_UNUSED_PARAMETER sal_uInt32, SAL_UNUSED_PARAMETER sal_uInt16,
+    SAL_UNUSED_PARAMETER sal_uInt16, SAL_UNUSED_PARAMETER sal_uInt32,
+    SAL_UNUSED_PARAMETER sal_uInt32,
+    typelib_TypeDescriptionReference * pBaseInterface,
+    sal_Int32 nMembers,
+    typelib_TypeDescriptionReference ** ppMembers )
+    SAL_THROW_EXTERN_C()
+{
+    // coverity[callee_ptr_arith] - not a bug
+    typelib_typedescription_newMIInterface(
+        ppRet, pTypeName, 0, 0, 0, 0, 0, pBaseInterface == nullptr ? 0 : 1,
+        &pBaseInterface, nMembers, ppMembers);
+}
+
+namespace {
+
+class BaseList {
+public:
+    struct Entry {
+        sal_Int32 memberOffset;
+        sal_Int32 directBaseIndex;
+        sal_Int32 directBaseMemberOffset;
+        typelib_InterfaceTypeDescription const * base;
+    };
+
+    typedef std::vector< Entry > List;
+
+    explicit BaseList(typelib_InterfaceTypeDescription const * desc);
+
+    List const & getList() const { return list; }
+
+    sal_Int32 getBaseMembers() const { return members; }
+
+private:
+    typedef std::set< OUString > Set;
+
+    void calculate(
+        Set& allSet,
+        sal_Int32 directBaseIndex, Set & directBaseSet,
+        sal_Int32 * directBaseMembers,
+        typelib_InterfaceTypeDescription const * desc);
+
+    List list;
+    sal_Int32 members;
+};
+
+BaseList::BaseList(typelib_InterfaceTypeDescription const * desc)
+   : members(0)
+{
+    Set allSet;
+    for (sal_Int32 i = 0; i < desc->nBaseTypes; ++i) {
+        Set directBaseSet;
+        sal_Int32 directBaseMembers = 0;
+        calculate(allSet, i, directBaseSet, &directBaseMembers, desc->ppBaseTypes[i]);
+    }
+}
+
+void BaseList::calculate(
+    Set& allSet,
+    sal_Int32 directBaseIndex, Set & directBaseSet,
+    sal_Int32 * directBaseMembers,
+    typelib_InterfaceTypeDescription const * desc)
+{
+    for (sal_Int32 i = 0; i < desc->nBaseTypes; ++i) {
+        calculate(allSet,
+            directBaseIndex, directBaseSet, directBaseMembers,
+            desc->ppBaseTypes[i]);
+    }
+    if (allSet.insert(desc->aBase.pTypeName).second) {
+        Entry e;
+        e.memberOffset = members;
+        e.directBaseIndex = directBaseIndex;
+        e.directBaseMemberOffset = *directBaseMembers;
+        e.base = desc;
+        list.push_back(e);
+        OSL_ASSERT(desc->ppAllMembers != nullptr);
+        members += desc->nMembers;
+    }
+    if (directBaseSet.insert(desc->aBase.pTypeName).second) {
+        OSL_ASSERT(desc->ppAllMembers != nullptr);
+        *directBaseMembers += desc->nMembers;
+    }
+}
+
+}
+
+extern "C" void SAL_CALL typelib_typedescription_newMIInterface(
+    typelib_InterfaceTypeDescription ** ppRet,
+    rtl_uString * pTypeName,
+    SAL_UNUSED_PARAMETER sal_uInt32, SAL_UNUSED_PARAMETER sal_uInt16,
+    SAL_UNUSED_PARAMETER sal_uInt16, SAL_UNUSED_PARAMETER sal_uInt32,
+    SAL_UNUSED_PARAMETER sal_uInt32,
+    sal_Int32 nBaseInterfaces,
+    typelib_TypeDescriptionReference ** ppBaseInterfaces,
+    sal_Int32 nMembers,
+    typelib_TypeDescriptionReference ** ppMembers )
+    SAL_THROW_EXTERN_C()
+{
+    if (*ppRet != nullptr) {
+        typelib_typedescription_release(&(*ppRet)->aBase);
+        *ppRet = nullptr;
+    }
+
+    typelib_InterfaceTypeDescription * pITD = nullptr;
+    typelib_typedescription_newEmpty(
+        reinterpret_cast<typelib_TypeDescription **>(&pITD), typelib_TypeClass_INTERFACE, pTypeName );
+
+    pITD->nBaseTypes = nBaseInterfaces;
+    pITD->ppBaseTypes = new typelib_InterfaceTypeDescription *[nBaseInterfaces];
+    for (sal_Int32 i = 0; i < nBaseInterfaces; ++i) {
+        pITD->ppBaseTypes[i] = nullptr;
+        typelib_typedescriptionreference_getDescription(
+            reinterpret_cast< typelib_TypeDescription ** >(
+                &pITD->ppBaseTypes[i]),
+            ppBaseInterfaces[i]);
+        if (pITD->ppBaseTypes[i] == nullptr
+            || !complete(
+                reinterpret_cast< typelib_TypeDescription ** >(
+                    &pITD->ppBaseTypes[i]),
+                false))
+        {
+            OSL_ASSERT(false);
+            return;
+        }
+        OSL_ASSERT(pITD->ppBaseTypes[i] != nullptr);
+    }
+    if (nBaseInterfaces > 0) {
+        pITD->pBaseTypeDescription = pITD->ppBaseTypes[0];
+    }
+    // set the
+    pITD->aUik.m_Data1 = 0;
+    pITD->aUik.m_Data2 = 0;
+    pITD->aUik.m_Data3 = 0;
+    pITD->aUik.m_Data4 = 0;
+    pITD->aUik.m_Data5 = 0;
+
+    BaseList aBaseList(pITD);
+    pITD->nAllMembers = nMembers + aBaseList.getBaseMembers();
+    pITD->nMembers = nMembers;
+
+    if( pITD->nAllMembers )
+    {
+        // at minimum one member exist, allocate the memory
+        pITD->ppAllMembers = new typelib_TypeDescriptionReference *[ pITD->nAllMembers ];
+        sal_Int32 n = 0;
+
+        BaseList::List const & rList = aBaseList.getList();
+        for (const auto& rEntry : rList)
+        {
+            typelib_InterfaceTypeDescription const * pBase = rEntry.base;
+            typelib_InterfaceTypeDescription const * pDirectBase
+                = pITD->ppBaseTypes[rEntry.directBaseIndex];
+            OSL_ASSERT(pBase->ppAllMembers != nullptr);
+            for (sal_Int32 j = 0; j < pBase->nMembers; ++j) {
+                typelib_TypeDescriptionReference const * pDirectBaseMember
+                    = pDirectBase->ppAllMembers[rEntry.directBaseMemberOffset + j];
+                OUString aName = OUString::unacquired(&pDirectBaseMember->pTypeName) +
+                        ":@" +
+                        OUString::number(rEntry.directBaseIndex) +
+                        "," +
+                        OUString::number(rEntry.memberOffset + j) +
+                        ":" +
+                        OUString::unacquired(&pITD->aBase.pTypeName);
+                typelib_TypeDescriptionReference * pDerivedMember = nullptr;
+                typelib_typedescriptionreference_new(
+                    &pDerivedMember, pDirectBaseMember->eTypeClass,
+                    aName.pData);
+                pITD->ppAllMembers[n++] = pDerivedMember;
+            }
+        }
+
+        if( nMembers )
+        {
+            pITD->ppMembers = pITD->ppAllMembers + aBaseList.getBaseMembers();
+        }
+
+        // add own members
+        for( sal_Int32 i = 0; i < nMembers; i++ )
+        {
+            typelib_typedescriptionreference_acquire( ppMembers[i] );
+            pITD->ppAllMembers[n++] = ppMembers[i];
+        }
+    }
+
+    typelib_TypeDescription * pTmp = &pITD->aBase;
+    static_assert( !TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( typelib_TypeClass_INTERFACE ) );
+    pTmp->pWeakRef = reinterpret_cast<typelib_TypeDescriptionReference *>(pTmp);
+    pTmp->nSize = typelib_typedescription_getAlignedUnoSize( pTmp, 0, pTmp->nAlignment );
+    pTmp->nAlignment = adjustAlignment( pTmp->nAlignment );
+    pTmp->bComplete = false;
+
+    *ppRet = pITD;
+}
+
+
+namespace {
+
+typelib_TypeDescriptionReference ** copyExceptions(
+    sal_Int32 count, rtl_uString ** typeNames)
+{
+    OSL_ASSERT(count >= 0);
+    if (count == 0) {
+        return nullptr;
+    }
+    typelib_TypeDescriptionReference ** p
+        = new typelib_TypeDescriptionReference *[count];
+    for (sal_Int32 i = 0; i < count; ++i) {
+        p[i] = nullptr;
+        typelib_typedescriptionreference_new(
+            p + i, typelib_TypeClass_EXCEPTION, typeNames[i]);
+    }
+    return p;
+}
+
+}
+
+extern "C" void SAL_CALL typelib_typedescription_newInterfaceMethod(
+    typelib_InterfaceMethodTypeDescription ** ppRet,
+    sal_Int32 nAbsolutePosition,
+    sal_Bool bOneWay,
+    rtl_uString * pTypeName,
+    typelib_TypeClass eReturnTypeClass,
+    rtl_uString * pReturnTypeName,
+    sal_Int32 nParams,
+    typelib_Parameter_Init * pParams,
+    sal_Int32 nExceptions,
+    rtl_uString ** ppExceptionNames )
+    SAL_THROW_EXTERN_C()
+{
+    if (*ppRet != nullptr) {
+        typelib_typedescription_release(&(*ppRet)->aBase.aBase);
+        *ppRet = nullptr;
+    }
+    sal_Int32 nOffset = rtl_ustr_lastIndexOfChar_WithLength(
+        pTypeName->buffer, pTypeName->length, ':');
+    if (nOffset <= 0 || pTypeName->buffer[nOffset - 1] != ':') {
+        OSL_FAIL("Bad interface method type name");
+        return;
+    }
+    OUString aInterfaceTypeName(pTypeName->buffer, nOffset - 1);
+    typelib_InterfaceTypeDescription * pInterface = nullptr;
+    typelib_typedescription_getByName(
+        reinterpret_cast< typelib_TypeDescription ** >(&pInterface),
+        aInterfaceTypeName.pData);
+    if (pInterface == nullptr
+        || pInterface->aBase.eTypeClass != typelib_TypeClass_INTERFACE
+        || !complete(
+            reinterpret_cast< typelib_TypeDescription ** >(&pInterface), false))
+    {
+        OSL_FAIL("No interface corresponding to interface method");
+        return;
+    }
+
+    typelib_typedescription_newEmpty(
+        reinterpret_cast<typelib_TypeDescription **>(ppRet), typelib_TypeClass_INTERFACE_METHOD, pTypeName );
+
+    rtl_uString_newFromStr_WithLength( &(*ppRet)->aBase.pMemberName,
+                                       pTypeName->buffer + nOffset +1,
+                                       pTypeName->length - nOffset -1 );
+    (*ppRet)->aBase.nPosition = nAbsolutePosition;
+    (*ppRet)->bOneWay = bOneWay;
+    typelib_typedescriptionreference_new( &(*ppRet)->pReturnTypeRef, eReturnTypeClass, pReturnTypeName );
+    (*ppRet)->nParams = nParams;
+    if( nParams )
+    {
+        (*ppRet)->pParams = new typelib_MethodParameter[ nParams ];
+
+        for( sal_Int32 i = 0; i < nParams; i++ )
+        {
+            // get the name of the parameter
+            (*ppRet)->pParams[ i ].pName = pParams[i].pParamName;
+            rtl_uString_acquire( (*ppRet)->pParams[ i ].pName );
+            (*ppRet)->pParams[ i ].pTypeRef = nullptr;
+            // get the type name of the parameter and create the weak reference
+            typelib_typedescriptionreference_new(
+                &(*ppRet)->pParams[ i ].pTypeRef, pParams[i].eTypeClass, pParams[i].pTypeName );
+            (*ppRet)->pParams[ i ].bIn = pParams[i].bIn;
+            (*ppRet)->pParams[ i ].bOut = pParams[i].bOut;
+        }
+    }
+    (*ppRet)->nExceptions = nExceptions;
+    (*ppRet)->ppExceptions = copyExceptions(nExceptions, ppExceptionNames);
+    (*ppRet)->pInterface = pInterface;
+    (*ppRet)->pBaseRef = nullptr;
+    OSL_ASSERT(
+        (nAbsolutePosition >= pInterface->nAllMembers - pInterface->nMembers)
+        && nAbsolutePosition < pInterface->nAllMembers);
+    (*ppRet)->nIndex = nAbsolutePosition
+        - (pInterface->nAllMembers - pInterface->nMembers);
+    static_assert( TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( typelib_TypeClass_INTERFACE_METHOD ) );
+    assert(reinterpret_cast<typelib_TypeDescription *>(*ppRet)->pWeakRef == nullptr);
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_newInterfaceAttribute(
+    typelib_InterfaceAttributeTypeDescription ** ppRet,
+    sal_Int32 nAbsolutePosition,
+    rtl_uString * pTypeName,
+    typelib_TypeClass eAttributeTypeClass,
+    rtl_uString * pAttributeTypeName,
+    sal_Bool bReadOnly )
+    SAL_THROW_EXTERN_C()
+{
+    typelib_typedescription_newExtendedInterfaceAttribute(
+        ppRet, nAbsolutePosition, pTypeName, eAttributeTypeClass,
+        pAttributeTypeName, bReadOnly, 0, nullptr, 0, nullptr);
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_newExtendedInterfaceAttribute(
+    typelib_InterfaceAttributeTypeDescription ** ppRet,
+    sal_Int32 nAbsolutePosition,
+    rtl_uString * pTypeName,
+    typelib_TypeClass eAttributeTypeClass,
+    rtl_uString * pAttributeTypeName,
+    sal_Bool bReadOnly,
+    sal_Int32 nGetExceptions, rtl_uString ** ppGetExceptionNames,
+    sal_Int32 nSetExceptions, rtl_uString ** ppSetExceptionNames )
+    SAL_THROW_EXTERN_C()
+{
+    if (*ppRet != nullptr) {
+        typelib_typedescription_release(&(*ppRet)->aBase.aBase);
+        *ppRet = nullptr;
+    }
+    sal_Int32 nOffset = rtl_ustr_lastIndexOfChar_WithLength(
+        pTypeName->buffer, pTypeName->length, ':');
+    if (nOffset <= 0 || pTypeName->buffer[nOffset - 1] != ':') {
+        OSL_FAIL("Bad interface attribute type name");
+        return;
+    }
+    OUString aInterfaceTypeName(pTypeName->buffer, nOffset - 1);
+    typelib_InterfaceTypeDescription * pInterface = nullptr;
+    typelib_typedescription_getByName(
+        reinterpret_cast< typelib_TypeDescription ** >(&pInterface),
+        aInterfaceTypeName.pData);
+    if (pInterface == nullptr
+        || pInterface->aBase.eTypeClass != typelib_TypeClass_INTERFACE
+        || !complete(
+            reinterpret_cast< typelib_TypeDescription ** >(&pInterface), false))
+    {
+        OSL_FAIL("No interface corresponding to interface attribute");
+        return;
+    }
+
+    typelib_typedescription_newEmpty(
+        reinterpret_cast<typelib_TypeDescription **>(ppRet), typelib_TypeClass_INTERFACE_ATTRIBUTE, pTypeName );
+
+    rtl_uString_newFromStr_WithLength( &(*ppRet)->aBase.pMemberName,
+                                       pTypeName->buffer + nOffset +1,
+                                       pTypeName->length - nOffset -1 );
+    (*ppRet)->aBase.nPosition = nAbsolutePosition;
+    typelib_typedescriptionreference_new( &(*ppRet)->pAttributeTypeRef, eAttributeTypeClass, pAttributeTypeName );
+    (*ppRet)->bReadOnly = bReadOnly;
+    (*ppRet)->pInterface = pInterface;
+    (*ppRet)->pBaseRef = nullptr;
+    OSL_ASSERT(
+        (nAbsolutePosition >= pInterface->nAllMembers - pInterface->nMembers)
+        && nAbsolutePosition < pInterface->nAllMembers);
+    (*ppRet)->nIndex = nAbsolutePosition
+        - (pInterface->nAllMembers - pInterface->nMembers);
+    (*ppRet)->nGetExceptions = nGetExceptions;
+    (*ppRet)->ppGetExceptions = copyExceptions(
+        nGetExceptions, ppGetExceptionNames);
+    (*ppRet)->nSetExceptions = nSetExceptions;
+    (*ppRet)->ppSetExceptions = copyExceptions(
+        nSetExceptions, ppSetExceptionNames);
+    static_assert( TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( typelib_TypeClass_INTERFACE_ATTRIBUTE ) );
+    assert(reinterpret_cast<typelib_TypeDescription *>(*ppRet)->pWeakRef == nullptr);
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_acquire(
+    typelib_TypeDescription * pTypeDescription )
+    SAL_THROW_EXTERN_C()
+{
+    osl_atomic_increment( &pTypeDescription->nRefCount );
+}
+
+
+namespace {
+
+void deleteExceptions(
+    sal_Int32 count, typelib_TypeDescriptionReference ** exceptions)
+{
+    for (sal_Int32 i = 0; i < count; ++i) {
+        typelib_typedescriptionreference_release(exceptions[i]);
+    }
+    delete[] exceptions;
+}
+
+}
+
+// frees anything except typelib_TypeDescription base!
+static void typelib_typedescription_destructExtendedMembers(
+    typelib_TypeDescription * pTD )
+{
+    OSL_ASSERT( typelib_TypeClass_TYPEDEF != pTD->eTypeClass );
+
+    switch( pTD->eTypeClass )
+    {
+    case typelib_TypeClass_SEQUENCE:
+        if( reinterpret_cast<typelib_IndirectTypeDescription*>(pTD)->pType )
+            typelib_typedescriptionreference_release( reinterpret_cast<typelib_IndirectTypeDescription*>(pTD)->pType );
+        break;
+    case typelib_TypeClass_STRUCT:
+        delete[] reinterpret_cast< typelib_StructTypeDescription * >(pTD)->
+            pParameterizedTypes;
+        [[fallthrough]];
+    case typelib_TypeClass_EXCEPTION:
+    {
+        typelib_CompoundTypeDescription * pCTD = reinterpret_cast<typelib_CompoundTypeDescription*>(pTD);
+        if( pCTD->pBaseTypeDescription )
+            typelib_typedescription_release( &pCTD->pBaseTypeDescription->aBase );
+        sal_Int32 i;
+        for( i = 0; i < pCTD->nMembers; i++ )
+        {
+            typelib_typedescriptionreference_release( pCTD->ppTypeRefs[i] );
+        }
+        if (pCTD->ppMemberNames)
+        {
+            for ( i = 0; i < pCTD->nMembers; i++ )
+            {
+                rtl_uString_release( pCTD->ppMemberNames[i] );
+            }
+            delete [] pCTD->ppMemberNames;
+        }
+        delete [] pCTD->ppTypeRefs;
+        delete [] pCTD->pMemberOffsets;
+    }
+    break;
+    case typelib_TypeClass_INTERFACE:
+    {
+        typelib_InterfaceTypeDescription * pITD = reinterpret_cast<typelib_InterfaceTypeDescription*>(pTD);
+        for( sal_Int32 i = 0; i < pITD->nAllMembers; i++ )
+        {
+            typelib_typedescriptionreference_release( pITD->ppAllMembers[i] );
+        }
+        delete [] pITD->ppAllMembers;
+        delete [] pITD->pMapMemberIndexToFunctionIndex;
+        delete [] pITD->pMapFunctionIndexToMemberIndex;
+        for (sal_Int32 i = 0; i < pITD->nBaseTypes; ++i) {
+            typelib_typedescription_release(
+                reinterpret_cast< typelib_TypeDescription * >(
+                    pITD->ppBaseTypes[i]));
+        }
+        delete[] pITD->ppBaseTypes;
+        break;
+    }
+    case typelib_TypeClass_INTERFACE_METHOD:
+    {
+        typelib_InterfaceMethodTypeDescription * pIMTD = reinterpret_cast<typelib_InterfaceMethodTypeDescription*>(pTD);
+        if( pIMTD->pReturnTypeRef )
+            typelib_typedescriptionreference_release( pIMTD->pReturnTypeRef );
+        for( sal_Int32 i = 0; i < pIMTD->nParams; i++ )
+        {
+            rtl_uString_release( pIMTD->pParams[ i ].pName );
+            typelib_typedescriptionreference_release( pIMTD->pParams[ i ].pTypeRef );
+        }
+        delete [] pIMTD->pParams;
+        deleteExceptions(pIMTD->nExceptions, pIMTD->ppExceptions);
+        rtl_uString_release( pIMTD->aBase.pMemberName );
+        typelib_typedescription_release(&pIMTD->pInterface->aBase);
+        if (pIMTD->pBaseRef != nullptr) {
+            typelib_typedescriptionreference_release(pIMTD->pBaseRef);
+        }
+    }
+    break;
+    case typelib_TypeClass_INTERFACE_ATTRIBUTE:
+    {
+        typelib_InterfaceAttributeTypeDescription * pIATD = reinterpret_cast<typelib_InterfaceAttributeTypeDescription*>(pTD);
+        deleteExceptions(pIATD->nGetExceptions, pIATD->ppGetExceptions);
+        deleteExceptions(pIATD->nSetExceptions, pIATD->ppSetExceptions);
+        if( pIATD->pAttributeTypeRef )
+            typelib_typedescriptionreference_release( pIATD->pAttributeTypeRef );
+        if( pIATD->aBase.pMemberName )
+            rtl_uString_release( pIATD->aBase.pMemberName );
+        typelib_typedescription_release(&pIATD->pInterface->aBase);
+        if (pIATD->pBaseRef != nullptr) {
+            typelib_typedescriptionreference_release(pIATD->pBaseRef);
+        }
+    }
+    break;
+    case typelib_TypeClass_ENUM:
+    {
+        typelib_EnumTypeDescription * pEnum = reinterpret_cast<typelib_EnumTypeDescription *>(pTD);
+        for ( sal_Int32 nPos = pEnum->nEnumValues; nPos--; )
+        {
+            rtl_uString_release( pEnum->ppEnumNames[nPos] );
+        }
+        delete [] pEnum->ppEnumNames;
+        delete [] pEnum->pEnumValues;
+    }
+    break;
+    default:
+    break;
+    }
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_release(
+    typelib_TypeDescription * pTD )
+    SAL_THROW_EXTERN_C()
+{
+    sal_Int32 ref = osl_atomic_decrement( &pTD->nRefCount );
+    OSL_ASSERT(ref >= 0);
+    if (0 != ref)
+        return;
+
+    TypeDescriptor_Init_Impl &rInit = Init();
+    if( TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( pTD->eTypeClass ) )
+    {
+        if( pTD->pWeakRef )
+        {
+            {
+                MutexGuard aGuard( rInit.maMutex );
+                // remove this description from the weak reference
+                pTD->pWeakRef->pType = nullptr;
+            }
+            typelib_typedescriptionreference_release( pTD->pWeakRef );
+        }
+    }
+    else
+    {
+        // this description is a reference too, so remove it from the hash table
+        MutexGuard aGuard( rInit.maMutex );
+        WeakMap_Impl::iterator aIt = rInit.maWeakMap.find( pTD->pTypeName->buffer );
+        if( aIt != rInit.maWeakMap.end() && static_cast<void *>((*aIt).second) == static_cast<void *>(pTD) )
+        {
+            // remove only if it contains the same object
+            rInit.maWeakMap.erase( aIt );
+        }
+    }
+
+    typelib_typedescription_destructExtendedMembers( pTD );
+    rtl_uString_release( pTD->pTypeName );
+
+#if OSL_DEBUG_LEVEL > 0
+    switch( pTD->eTypeClass )
+    {
+    case typelib_TypeClass_SEQUENCE:
+        osl_atomic_decrement( &rInit.nIndirectTypeDescriptionCount );
+        break;
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+        osl_atomic_decrement( &rInit.nCompoundTypeDescriptionCount );
+        break;
+    case typelib_TypeClass_INTERFACE:
+        osl_atomic_decrement( &rInit.nInterfaceTypeDescriptionCount );
+        break;
+    case typelib_TypeClass_INTERFACE_METHOD:
+        osl_atomic_decrement( &rInit.nInterfaceMethodTypeDescriptionCount );
+        break;
+    case typelib_TypeClass_INTERFACE_ATTRIBUTE:
+        osl_atomic_decrement( &rInit.nInterfaceAttributeTypeDescriptionCount );
+        break;
+    case typelib_TypeClass_ENUM:
+        osl_atomic_decrement( &rInit.nEnumTypeDescriptionCount );
+        break;
+    default:
+        osl_atomic_decrement( &rInit.nTypeDescriptionCount );
+    }
+#endif
+
+    freeTypeDescription(pTD);
+}
+
+
+extern "C" void SAL_CALL typelib_typedescription_register(
+    typelib_TypeDescription ** ppNewDescription )
+    SAL_THROW_EXTERN_C()
+{
+    // connect the description with the weak reference
+    TypeDescriptor_Init_Impl &rInit = Init();
+    ClearableMutexGuard aGuard( rInit.maMutex );
+
+    typelib_TypeDescriptionReference * pTDR = nullptr;
+    typelib_typedescriptionreference_getByName( &pTDR, (*ppNewDescription)->pTypeName );
+
+    OSL_ASSERT( (*ppNewDescription)->pWeakRef || TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( (*ppNewDescription)->eTypeClass ) );
+    if( pTDR )
+    {
+        OSL_ASSERT( (*ppNewDescription)->eTypeClass == pTDR->eTypeClass );
+        if( pTDR->pType )
+        {
+            if (TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( pTDR->eTypeClass ))
+            {
+                // pRef->pType->pWeakRef == 0 means that the description is empty
+                if (pTDR->pType->pWeakRef)
+                {
+                    if (osl_atomic_increment( &pTDR->pType->nRefCount ) > 1)
+                    {
+                        // The reference is incremented. The object cannot be destroyed.
+                        // Release the guard at the earliest point.
+                        aGuard.clear();
+                        ::typelib_typedescription_release( *ppNewDescription );
+                        *ppNewDescription = pTDR->pType;
+                        ::typelib_typedescriptionreference_release( pTDR );
+                        return;
+                    }
+                    // destruction of this type in progress (another thread!)
+                    (void)osl_atomic_decrement( &pTDR->pType->nRefCount );
+                }
+                // take new descr
+                pTDR->pType = *ppNewDescription;
+                OSL_ASSERT( ! (*ppNewDescription)->pWeakRef );
+                (*ppNewDescription)->pWeakRef = pTDR;
+                return;
+            }
+            // !reallyWeak
+
+            if ((static_cast<void *>(pTDR) != static_cast<void *>(*ppNewDescription)) && // if different
+                (!pTDR->pType->pWeakRef || // uninit: ref data only set
+                 // new one is complete:
+                 (!pTDR->pType->bComplete && (*ppNewDescription)->bComplete) ||
+                 // new one may be partly initialized interface (except of tables):
+                 (typelib_TypeClass_INTERFACE == pTDR->pType->eTypeClass &&
+                  !reinterpret_cast<typelib_InterfaceTypeDescription *>(pTDR->pType)->ppAllMembers &&
+                  (*reinterpret_cast<typelib_InterfaceTypeDescription **>(ppNewDescription))->ppAllMembers)))
+            {
+                // uninitialized or incomplete
+
+                if (pTDR->pType->pWeakRef) // if init
+                {
+                    switch (pTDR->pType->eTypeClass) {
+                    case typelib_TypeClass_ENUM:
+                        {
+                            auto const src = reinterpret_cast<typelib_EnumTypeDescription *>(
+                                *ppNewDescription);
+                            auto const dst = reinterpret_cast<typelib_EnumTypeDescription *>(
+                                pTDR->pType);
+                            assert(dst->nEnumValues == 0);
+                            assert(dst->ppEnumNames == nullptr);
+                            assert(dst->pEnumValues == nullptr);
+                            std::swap(src->nEnumValues, dst->nEnumValues);
+                            std::swap(src->ppEnumNames, dst->ppEnumNames);
+                            std::swap(src->pEnumValues, dst->pEnumValues);
+                            break;
+                        }
+                    case typelib_TypeClass_STRUCT:
+                    case typelib_TypeClass_EXCEPTION:
+                        {
+                            auto const src = reinterpret_cast<typelib_CompoundTypeDescription *>(
+                                *ppNewDescription);
+                            auto const dst = reinterpret_cast<typelib_CompoundTypeDescription *>(
+                                pTDR->pType);
+                            assert(
+                                (dst->pBaseTypeDescription == nullptr)
+                                == (src->pBaseTypeDescription == nullptr));
+                            assert(dst->nMembers == src->nMembers);
+                            assert((dst->pMemberOffsets == nullptr) == (dst->nMembers == 0));
+                            assert((dst->ppTypeRefs == nullptr) == (dst->nMembers == 0));
+                            assert(dst->ppMemberNames == nullptr);
+                            assert(
+                                pTDR->pType->eTypeClass != typelib_TypeClass_STRUCT
+                                || ((reinterpret_cast<typelib_StructTypeDescription *>(
+                                         dst)->pParameterizedTypes
+                                     == nullptr)
+                                    == (reinterpret_cast<typelib_StructTypeDescription *>(
+                                            src)->pParameterizedTypes
+                                        == nullptr)));
+                            std::swap(src->ppMemberNames, dst->ppMemberNames);
+                            break;
+                        }
+                    case typelib_TypeClass_INTERFACE:
+                        {
+                            auto const src = reinterpret_cast<typelib_InterfaceTypeDescription *>(
+                                *ppNewDescription);
+                            auto const dst = reinterpret_cast<typelib_InterfaceTypeDescription *>(
+                                pTDR->pType);
+                            assert(
+                                (dst->pBaseTypeDescription == nullptr)
+                                == (src->pBaseTypeDescription == nullptr));
+                            assert(dst->nMembers == 0);
+                            assert(dst->ppMembers == nullptr);
+                            assert(dst->nAllMembers == 0);
+                            assert(dst->ppAllMembers == nullptr);
+                            assert(dst->pMapMemberIndexToFunctionIndex == nullptr);
+                            assert(dst->nMapFunctionIndexToMemberIndex == 0);
+                            assert(dst->pMapFunctionIndexToMemberIndex == nullptr);
+                            assert(dst->nBaseTypes == src->nBaseTypes);
+                            assert((dst->ppBaseTypes == nullptr) == (src->ppBaseTypes == nullptr));
+                            std::swap(src->nMembers, dst->nMembers);
+                            std::swap(src->ppMembers, dst->ppMembers);
+                            std::swap(src->nAllMembers, dst->nAllMembers);
+                            std::swap(src->ppAllMembers, dst->ppAllMembers);
+                            std::swap(
+                                src->pMapMemberIndexToFunctionIndex,
+                                dst->pMapMemberIndexToFunctionIndex);
+                            std::swap(
+                                src->nMapFunctionIndexToMemberIndex,
+                                dst->nMapFunctionIndexToMemberIndex);
+                            std::swap(
+                                src->pMapFunctionIndexToMemberIndex,
+                                dst->pMapFunctionIndexToMemberIndex);
+                            break;
+                        }
+                    default:
+                        assert(false); // this cannot happen
+                    }
+                }
+                else
+                {
+                    // pTDR->pType->pWeakRef == 0 means that the description is empty
+                    // description is not weak and the not the same
+                    sal_Int32 nSize = getDescriptionSize( (*ppNewDescription)->eTypeClass );
+
+                    // copy all specific data for the descriptions
+                    memcpy(
+                        pTDR->pType +1,
+                        *ppNewDescription +1,
+                        nSize - sizeof(typelib_TypeDescription) );
+
+                    memset(
+                        *ppNewDescription +1,
+                        0,
+                        nSize - sizeof( typelib_TypeDescription ) );
+                }
+
+                pTDR->pType->bComplete = (*ppNewDescription)->bComplete;
+                pTDR->pType->nSize = (*ppNewDescription)->nSize;
+                pTDR->pType->nAlignment = (*ppNewDescription)->nAlignment;
+
+                if( pTDR->pType->bOnDemand && !(*ppNewDescription)->bOnDemand )
+                {
+                    // switch from OnDemand to !OnDemand, so the description must be acquired
+                    typelib_typedescription_acquire( pTDR->pType );
+                }
+                else if( !pTDR->pType->bOnDemand && (*ppNewDescription)->bOnDemand )
+                {
+                    // switch from !OnDemand to OnDemand, so the description must be released
+                    assert(pTDR->pType->nRefCount > 1);
+                    // coverity[freed_arg] - pType's nRefCount is > 1 here
+                    typelib_typedescription_release( pTDR->pType );
+                }
+
+                pTDR->pType->bOnDemand = (*ppNewDescription)->bOnDemand;
+                // initialized
+                pTDR->pType->pWeakRef = pTDR;
+            }
+
+            typelib_typedescription_release( *ppNewDescription );
+            // pTDR was acquired by getByName(), so it must not be acquired again
+            *ppNewDescription = pTDR->pType;
+            return;
+        }
+    }
+    else if( TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( (*ppNewDescription)->eTypeClass) )
+    {
+        typelib_typedescriptionreference_new(
+            &pTDR, (*ppNewDescription)->eTypeClass, (*ppNewDescription)->pTypeName );
+    }
+    else
+    {
+        pTDR = reinterpret_cast<typelib_TypeDescriptionReference *>(*ppNewDescription);
+
+        // description is the weak itself, so register it
+        rInit.maWeakMap[pTDR->pTypeName->buffer] = pTDR;
+        OSL_ASSERT( static_cast<void *>(*ppNewDescription) == static_cast<void *>(pTDR) );
+    }
+
+    // By default this reference is not really weak. The reference hold the description
+    // and the description hold the reference.
+    if( !(*ppNewDescription)->bOnDemand )
+    {
+        // nor OnDemand so the description must be acquired if registered
+        typelib_typedescription_acquire( *ppNewDescription );
+    }
+
+    pTDR->pType = *ppNewDescription;
+    (*ppNewDescription)->pWeakRef = pTDR;
+    OSL_ASSERT( rtl_ustr_compare( pTDR->pTypeName->buffer, (*ppNewDescription)->pTypeName->buffer ) == 0 );
+    OSL_ASSERT( pTDR->eTypeClass == (*ppNewDescription)->eTypeClass );
+}
+
+
+static bool type_equals(
+    typelib_TypeDescriptionReference const * p1, typelib_TypeDescriptionReference const * p2 )
+{
+    return (p1 == p2 ||
+            (p1->eTypeClass == p2->eTypeClass &&
+             p1->pTypeName->length == p2->pTypeName->length &&
+             rtl_ustr_compare( p1->pTypeName->buffer, p2->pTypeName->buffer ) == 0));
+}
+extern "C" sal_Bool SAL_CALL typelib_typedescription_equals(
+    const typelib_TypeDescription * p1, const typelib_TypeDescription * p2 )
+    SAL_THROW_EXTERN_C()
+{
+    return type_equals(
+        reinterpret_cast<typelib_TypeDescriptionReference const *>(p1), reinterpret_cast<typelib_TypeDescriptionReference const *>(p2) );
+}
+
+
+extern "C" sal_Int32 typelib_typedescription_getAlignedUnoSize(
+    const typelib_TypeDescription * pTypeDescription,
+    sal_Int32 nOffset, sal_Int32 & rMaxIntegralTypeSize )
+    SAL_THROW_EXTERN_C()
+{
+    sal_Int32 nSize;
+    if( pTypeDescription->nSize )
+    {
+        // size and alignment are set
+        rMaxIntegralTypeSize = pTypeDescription->nAlignment;
+        nSize = pTypeDescription->nSize;
+    }
+    else
+    {
+        nSize = 0;
+        rMaxIntegralTypeSize = 1;
+
+        OSL_ASSERT( typelib_TypeClass_TYPEDEF != pTypeDescription->eTypeClass );
+
+        switch( pTypeDescription->eTypeClass )
+        {
+            case typelib_TypeClass_INTERFACE:
+                // FEATURE_INTERFACE
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( void * ));
+                break;
+            case typelib_TypeClass_ENUM:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( typelib_TypeClass ));
+                break;
+            case typelib_TypeClass_STRUCT:
+            case typelib_TypeClass_EXCEPTION:
+                // FEATURE_EMPTYCLASS
+                {
+                typelib_CompoundTypeDescription const * pTmp = reinterpret_cast<typelib_CompoundTypeDescription const *>(pTypeDescription);
+                sal_Int32 nStructSize = 0;
+                if( pTmp->pBaseTypeDescription )
+                {
+                    // inherit structs extends the base struct.
+                    nStructSize = pTmp->pBaseTypeDescription->aBase.nSize;
+                    rMaxIntegralTypeSize = pTmp->pBaseTypeDescription->aBase.nAlignment;
+                }
+                for( sal_Int32 i = 0; i < pTmp->nMembers; i++ )
+                {
+                    typelib_TypeDescription * pMemberType = nullptr;
+                    typelib_TypeDescriptionReference * pMemberRef = pTmp->ppTypeRefs[i];
+
+                    sal_Int32 nMaxIntegral;
+                    if (pMemberRef->eTypeClass == typelib_TypeClass_INTERFACE
+                        || pMemberRef->eTypeClass == typelib_TypeClass_SEQUENCE)
+                    {
+                        nMaxIntegral = sal_Int32(sizeof(void *));
+                        nStructSize = newAlignedSize( nStructSize, nMaxIntegral, nMaxIntegral );
+                    }
+                    else
+                    {
+                        TYPELIB_DANGER_GET( &pMemberType, pMemberRef );
+                        nStructSize = typelib_typedescription_getAlignedUnoSize(
+                            pMemberType, nStructSize, nMaxIntegral );
+                        TYPELIB_DANGER_RELEASE( pMemberType );
+                    }
+                    if( nMaxIntegral > rMaxIntegralTypeSize )
+                        rMaxIntegralTypeSize = nMaxIntegral;
+                }
+#ifdef __m68k__
+                // Anything that is at least 16 bits wide is aligned on a 16-bit
+                // boundary on the m68k default abi
+                sal_Int32 nMaxAlign = std::min(rMaxIntegralTypeSize, sal_Int32( 2 ));
+                nStructSize = (nStructSize + nMaxAlign -1) / nMaxAlign * nMaxAlign;
+#else
+                // Example: A { double; int; } structure has a size of 16 instead of 10. The
+                // compiler must follow this rule if it is possible to access members in arrays through:
+                // (Element *)((char *)pArray + sizeof( Element ) * ElementPos)
+                nStructSize = (nStructSize + rMaxIntegralTypeSize -1)
+                                / rMaxIntegralTypeSize * rMaxIntegralTypeSize;
+#endif
+                nSize += nStructSize;
+                }
+                break;
+            case typelib_TypeClass_SEQUENCE:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( void * ));
+                break;
+            case typelib_TypeClass_ANY:
+                // FEATURE_ANY
+                nSize = sal_Int32(sizeof( uno_Any ));
+                rMaxIntegralTypeSize = sal_Int32(sizeof( void * ));
+                break;
+            case typelib_TypeClass_TYPE:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( typelib_TypeDescriptionReference * ));
+                break;
+            case typelib_TypeClass_BOOLEAN:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( sal_Bool ));
+                break;
+            case typelib_TypeClass_CHAR:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( sal_Unicode ));
+                break;
+            case typelib_TypeClass_STRING:
+                // FEATURE_STRING
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( rtl_uString * ));
+                break;
+            case typelib_TypeClass_FLOAT:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( float ));
+                break;
+            case typelib_TypeClass_DOUBLE:
+#ifdef AIX
+                //See previous AIX ifdef comment for an explanation
+                nSize = (sal_Int32)(sizeof(double));
+                rMaxIntegralTypeSize = (sal_Int32)(sizeof(void*));
+#else
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( double ));
+#endif
+                break;
+            case typelib_TypeClass_BYTE:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( sal_Int8 ));
+                break;
+            case typelib_TypeClass_SHORT:
+            case typelib_TypeClass_UNSIGNED_SHORT:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( sal_Int16 ));
+                break;
+            case typelib_TypeClass_LONG:
+            case typelib_TypeClass_UNSIGNED_LONG:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( sal_Int32 ));
+                break;
+            case typelib_TypeClass_HYPER:
+            case typelib_TypeClass_UNSIGNED_HYPER:
+                nSize = rMaxIntegralTypeSize = sal_Int32(sizeof( sal_Int64 ));
+                break;
+            case typelib_TypeClass_UNKNOWN:
+            case typelib_TypeClass_SERVICE:
+            case typelib_TypeClass_MODULE:
+            default:
+                OSL_FAIL( "not convertible type" );
+        };
+    }
+
+    return newAlignedSize( nOffset, nSize, rMaxIntegralTypeSize );
+}
+
+
+namespace {
+
+typelib_TypeDescriptionReference ** copyExceptions(
+    sal_Int32 count, typelib_TypeDescriptionReference ** source)
+{
+    typelib_TypeDescriptionReference ** p
+        = new typelib_TypeDescriptionReference *[count];
+    for (sal_Int32 i = 0; i < count; ++i) {
+        p[i] = source[i];
+        typelib_typedescriptionreference_acquire(p[i]);
+    }
+    return p;
+}
+
+bool createDerivedInterfaceMemberDescription(
+    typelib_TypeDescription ** result, OUString const & name,
+    typelib_TypeDescriptionReference * baseRef,
+    typelib_TypeDescription const * base, typelib_TypeDescription * interface,
+    sal_Int32 index, sal_Int32 position)
+{
+    if (!baseRef || !base || !interface)
+        return false;
+
+    switch (base->eTypeClass) {
+    case typelib_TypeClass_INTERFACE_METHOD:
+        {
+            typelib_typedescription_newEmpty(
+                result, typelib_TypeClass_INTERFACE_METHOD, name.pData);
+            typelib_InterfaceMethodTypeDescription const * baseMethod
+                = reinterpret_cast<
+                typelib_InterfaceMethodTypeDescription const * >(base);
+            typelib_InterfaceMethodTypeDescription * newMethod
+                = reinterpret_cast<
+                typelib_InterfaceMethodTypeDescription * >(*result);
+            newMethod->aBase.nPosition = position;
+            newMethod->aBase.pMemberName
+                = baseMethod->aBase.pMemberName;
+            rtl_uString_acquire(
+                newMethod->aBase.pMemberName);
+            newMethod->pReturnTypeRef = baseMethod->pReturnTypeRef;
+            typelib_typedescriptionreference_acquire(
+                newMethod->pReturnTypeRef);
+            newMethod->nParams = baseMethod->nParams;
+            newMethod->pParams = new typelib_MethodParameter[
+                newMethod->nParams];
+            for (sal_Int32 i = 0; i < newMethod->nParams; ++i) {
+                newMethod->pParams[i].pName
+                    = baseMethod->pParams[i].pName;
+                rtl_uString_acquire(
+                    newMethod->pParams[i].pName);
+                newMethod->pParams[i].pTypeRef
+                    = baseMethod->pParams[i].pTypeRef;
+                typelib_typedescriptionreference_acquire(
+                    newMethod->pParams[i].pTypeRef);
+                newMethod->pParams[i].bIn = baseMethod->pParams[i].bIn;
+                newMethod->pParams[i].bOut = baseMethod->pParams[i].bOut;
+            }
+            newMethod->nExceptions = baseMethod->nExceptions;
+            newMethod->ppExceptions = copyExceptions(
+                baseMethod->nExceptions, baseMethod->ppExceptions);
+            newMethod->bOneWay = baseMethod->bOneWay;
+            newMethod->pInterface
+                = reinterpret_cast< typelib_InterfaceTypeDescription * >(
+                    interface);
+            newMethod->pBaseRef = baseRef;
+            newMethod->nIndex = index;
+            return true;
+        }
+
+    case typelib_TypeClass_INTERFACE_ATTRIBUTE:
+        {
+            typelib_typedescription_newEmpty(
+                result, typelib_TypeClass_INTERFACE_ATTRIBUTE, name.pData);
+            typelib_InterfaceAttributeTypeDescription const * baseAttribute
+                = reinterpret_cast<
+                typelib_InterfaceAttributeTypeDescription const * >(base);
+            typelib_InterfaceAttributeTypeDescription * newAttribute
+                = reinterpret_cast<
+                typelib_InterfaceAttributeTypeDescription * >(*result);
+            newAttribute->aBase.nPosition = position;
+            newAttribute->aBase.pMemberName
+                = baseAttribute->aBase.pMemberName;
+            rtl_uString_acquire(newAttribute->aBase.pMemberName);
+            newAttribute->bReadOnly = baseAttribute->bReadOnly;
+            newAttribute->pAttributeTypeRef
+                = baseAttribute->pAttributeTypeRef;
+            typelib_typedescriptionreference_acquire(newAttribute->pAttributeTypeRef);
+            newAttribute->pInterface
+                = reinterpret_cast< typelib_InterfaceTypeDescription * >(
+                    interface);
+            newAttribute->pBaseRef = baseRef;
+            newAttribute->nIndex = index;
+            newAttribute->nGetExceptions = baseAttribute->nGetExceptions;
+            newAttribute->ppGetExceptions = copyExceptions(
+                baseAttribute->nGetExceptions,
+                baseAttribute->ppGetExceptions);
+            newAttribute->nSetExceptions = baseAttribute->nSetExceptions;
+            newAttribute->ppSetExceptions = copyExceptions(
+                baseAttribute->nSetExceptions,
+                baseAttribute->ppSetExceptions);
+            return true;
+        }
+
+    default:
+        break;
+    }
+    return false;
+}
+
+}
+
+extern "C" void SAL_CALL typelib_typedescription_getByName(
+    typelib_TypeDescription ** ppRet, rtl_uString * pName )
+    SAL_THROW_EXTERN_C()
+{
+    if( *ppRet )
+    {
+        typelib_typedescription_release( *ppRet );
+        *ppRet = nullptr;
+    }
+
+    static bool bInited = false;
+    TypeDescriptor_Init_Impl &rInit = Init();
+
+    if( !bInited )
+    {
+        // guard against multi thread access
+        MutexGuard aGuard( rInit.maMutex );
+        if( !bInited )
+        {
+            // avoid recursion during the next ...new calls
+            bInited = true;
+
+            typelib_TypeDescription * pType = nullptr;
+            typelib_typedescription_new( &pType, typelib_TypeClass_TYPE, OUString("type").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_VOID, OUString("void").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_BOOLEAN, OUString("boolean").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_CHAR, OUString("char").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_BYTE, OUString("byte").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_STRING, OUString("string").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_SHORT, OUString("short").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_UNSIGNED_SHORT, OUString("unsigned short").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_LONG, OUString("long").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_UNSIGNED_LONG, OUString("unsigned long").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_HYPER, OUString("hyper").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_UNSIGNED_HYPER, OUString("unsigned hyper").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_FLOAT, OUString("float").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_DOUBLE, OUString("double").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_new( &pType, typelib_TypeClass_ANY, OUString("any").pData, nullptr, 0, nullptr );
+            typelib_typedescription_register( &pType );
+            typelib_typedescription_release( pType );
+        }
+    }
+
+    typelib_TypeDescriptionReference * pTDR = nullptr;
+    typelib_typedescriptionreference_getByName( &pTDR, pName );
+    if( pTDR )
+    {
+        {
+        // guard against multi thread access
+        MutexGuard aGuard( rInit.maMutex );
+        // pTDR->pType->pWeakRef == 0 means that the description is empty
+        if( pTDR->pType && pTDR->pType->pWeakRef )
+        {
+            typelib_typedescription_acquire( pTDR->pType );
+            *ppRet = pTDR->pType;
+        }
+        }
+        typelib_typedescriptionreference_release( pTDR );
+    }
+
+    if (nullptr != *ppRet)
+        return;
+
+    // check for sequence
+    OUString const & name = OUString::unacquired( &pName );
+    if (2 < name.getLength() && '[' == name[ 0 ])
+    {
+        OUString element_name( name.copy( 2 ) );
+        typelib_TypeDescription * element_td = nullptr;
+        typelib_typedescription_getByName( &element_td, element_name.pData );
+        if (nullptr != element_td)
+        {
+            typelib_typedescription_new(
+                ppRet, typelib_TypeClass_SEQUENCE, pName, element_td->pWeakRef, 0, nullptr );
+            // register?
+            typelib_typedescription_release( element_td );
+        }
+    }
+    if (nullptr == *ppRet)
+    {
+        // Check for derived interface member type:
+        sal_Int32 i1 = name.lastIndexOf(":@");
+        if (i1 >= 0) {
+            sal_Int32 i2 = i1 + RTL_CONSTASCII_LENGTH(":@");
+            sal_Int32 i3 = name.indexOf(',', i2);
+            if (i3 >= 0) {
+                sal_Int32 i4 = name.indexOf(':', i3);
+                if (i4 >= 0) {
+                    typelib_TypeDescriptionReference * pBaseRef = nullptr;
+                    typelib_TypeDescription * pBase = nullptr;
+                    typelib_TypeDescription * pInterface = nullptr;
+                    typelib_typedescriptionreference_getByName(
+                        &pBaseRef, name.copy(0, i1).pData);
+                    if (pBaseRef != nullptr) {
+                        typelib_typedescriptionreference_getDescription(
+                            &pBase, pBaseRef);
+                    }
+                    typelib_typedescription_getByName(
+                        &pInterface, name.copy(i4 + 1).pData);
+                    if (!createDerivedInterfaceMemberDescription(
+                            ppRet, name, pBaseRef, pBase, pInterface,
+                            o3tl::toInt32(name.subView(i2, i3 - i2)),
+                            o3tl::toInt32(name.subView(i3 + 1, i4 - i3 - 1))))
+                    {
+                        if (pInterface != nullptr) {
+                            typelib_typedescription_release(pInterface);
+                        }
+                        if (pBase != nullptr) {
+                            typelib_typedescription_release(pBase);
+                        }
+                        if (pBaseRef != nullptr) {
+                            typelib_typedescriptionreference_release(
+                                pBaseRef);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    if (nullptr == *ppRet)
+    {
+        // on demand access
+        rInit.callChain( ppRet, pName );
+    }
+
+    if( !(*ppRet) )
+        return;
+
+    // typedescription found
+    if (typelib_TypeClass_TYPEDEF == (*ppRet)->eTypeClass)
+    {
+        typelib_TypeDescription * pTD = nullptr;
+        typelib_typedescriptionreference_getDescription(
+            &pTD, reinterpret_cast<typelib_IndirectTypeDescription *>(*ppRet)->pType );
+        typelib_typedescription_release( *ppRet );
+        *ppRet = pTD;
+    }
+    else
+    {
+        // set to on demand
+        (*ppRet)->bOnDemand = true;
+        // The type description is hold by the reference until
+        // on demand is activated.
+        typelib_typedescription_register( ppRet );
+
+        // insert into the cache
+        MutexGuard aGuard( rInit.maMutex );
+        if( rInit.maCache.size() >= nCacheSize )
+        {
+            typelib_typedescription_release( rInit.maCache.front() );
+            rInit.maCache.pop_front();
+        }
+        // descriptions in the cache must be acquired!
+        typelib_typedescription_acquire( *ppRet );
+        rInit.maCache.push_back( *ppRet );
+    }
+}
+
+extern "C" void SAL_CALL typelib_typedescriptionreference_newByAsciiName(
+    typelib_TypeDescriptionReference ** ppTDR,
+    typelib_TypeClass eTypeClass,
+    const char * pTypeName )
+    SAL_THROW_EXTERN_C()
+{
+    OUString aTypeName( OUString::createFromAscii( pTypeName ) );
+    typelib_typedescriptionreference_new( ppTDR, eTypeClass, aTypeName.pData );
+}
+
+extern "C" void SAL_CALL typelib_typedescriptionreference_new(
+    typelib_TypeDescriptionReference ** ppTDR,
+    typelib_TypeClass eTypeClass, rtl_uString * pTypeName )
+    SAL_THROW_EXTERN_C()
+{
+    TypeDescriptor_Init_Impl &rInit = Init();
+    if( eTypeClass == typelib_TypeClass_TYPEDEF )
+    {
+        // on demand access
+        typelib_TypeDescription * pRet = nullptr;
+        rInit.callChain( &pRet, pTypeName );
+        if( pRet )
+        {
+            // typedescription found
+            if (typelib_TypeClass_TYPEDEF == pRet->eTypeClass)
+            {
+                typelib_typedescriptionreference_acquire(
+                    reinterpret_cast<typelib_IndirectTypeDescription *>(pRet)->pType );
+                if (*ppTDR)
+                    typelib_typedescriptionreference_release( *ppTDR );
+                *ppTDR = reinterpret_cast<typelib_IndirectTypeDescription *>(pRet)->pType;
+                typelib_typedescription_release( pRet );
+            }
+            else
+            {
+                // set to on demand
+                pRet->bOnDemand = true;
+                // The type description is hold by the reference until
+                // on demand is activated.
+                typelib_typedescription_register( &pRet );
+
+                // insert into the cache
+                MutexGuard aGuard( rInit.maMutex );
+                if( rInit.maCache.size() >= nCacheSize )
+                {
+                    typelib_typedescription_release( rInit.maCache.front() );
+                    rInit.maCache.pop_front();
+                }
+                rInit.maCache.push_back( pRet );
+                // pRet kept acquired for cache
+
+                typelib_typedescriptionreference_acquire( pRet->pWeakRef );
+                if (*ppTDR)
+                    typelib_typedescriptionreference_release( *ppTDR );
+                *ppTDR = pRet->pWeakRef;
+            }
+        }
+        else if (*ppTDR)
+        {
+            SAL_INFO("cppu.typelib", "typedef not found : " << pTypeName);
+            typelib_typedescriptionreference_release( *ppTDR );
+            *ppTDR = nullptr;
+        }
+        return;
+    }
+
+    MutexGuard aGuard( rInit.maMutex );
+    typelib_typedescriptionreference_getByName( ppTDR, pTypeName );
+    if( *ppTDR )
+        return;
+
+    if( TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( eTypeClass ) )
+    {
+        typelib_TypeDescriptionReference * pTDR = new typelib_TypeDescriptionReference;
+#if OSL_DEBUG_LEVEL > 0
+        osl_atomic_increment( &rInit.nTypeDescriptionReferenceCount );
+#endif
+        pTDR->nRefCount = 1;
+        pTDR->nStaticRefCount = 0;
+        pTDR->eTypeClass = eTypeClass;
+        pTDR->pUniqueIdentifier = nullptr;
+        pTDR->pReserved = nullptr;
+        pTDR->pTypeName = pTypeName;
+        rtl_uString_acquire( pTDR->pTypeName );
+        pTDR->pType = nullptr;
+        *ppTDR = pTDR;
+    }
+    else
+    {
+        typelib_typedescription_newEmpty( reinterpret_cast<typelib_TypeDescription ** >(ppTDR), eTypeClass, pTypeName );
+        // description will be registered but not acquired
+        (*reinterpret_cast<typelib_TypeDescription **>(ppTDR))->bOnDemand = true;
+        (*reinterpret_cast<typelib_TypeDescription **>(ppTDR))->bComplete = false;
+    }
+
+    // Heavy hack, the const sal_Unicode * is hold by the typedescription reference
+    // not registered
+    rInit.maWeakMap[ (*ppTDR)->pTypeName->buffer ] = *ppTDR;
+}
+
+
+extern "C" void SAL_CALL typelib_typedescriptionreference_acquire(
+    typelib_TypeDescriptionReference * pRef )
+    SAL_THROW_EXTERN_C()
+{
+    osl_atomic_increment( &pRef->nRefCount );
+}
+
+
+extern "C" void SAL_CALL typelib_typedescriptionreference_release(
+    typelib_TypeDescriptionReference * pRef )
+    SAL_THROW_EXTERN_C()
+{
+    // Is it a type description?
+    if( TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( pRef->eTypeClass ) )
+    {
+        if( ! osl_atomic_decrement( &pRef->nRefCount ) )
+        {
+            TypeDescriptor_Init_Impl &rInit = Init();
+            MutexGuard aGuard( rInit.maMutex );
+            WeakMap_Impl::iterator aIt = rInit.maWeakMap.find( pRef->pTypeName->buffer );
+            if( aIt != rInit.maWeakMap.end() && (*aIt).second == pRef )
+            {
+                // remove only if it contains the same object
+                rInit.maWeakMap.erase( aIt );
+            }
+
+            rtl_uString_release( pRef->pTypeName );
+            OSL_ASSERT( pRef->pType == nullptr );
+#if OSL_DEBUG_LEVEL > 0
+            osl_atomic_decrement( &rInit.nTypeDescriptionReferenceCount );
+#endif
+            delete pRef;
+        }
+    }
+    else
+    {
+        typelib_typedescription_release( reinterpret_cast<typelib_TypeDescription *>(pRef) );
+    }
+}
+
+
+extern "C" void SAL_CALL typelib_typedescriptionreference_getDescription(
+    typelib_TypeDescription ** ppRet, typelib_TypeDescriptionReference * pRef )
+    SAL_THROW_EXTERN_C()
+{
+    if( *ppRet )
+    {
+        typelib_typedescription_release( *ppRet );
+        *ppRet = nullptr;
+    }
+
+    if( !TYPELIB_TYPEDESCRIPTIONREFERENCE_ISREALLYWEAK( pRef->eTypeClass ) && pRef->pType && pRef->pType->pWeakRef )
+    {
+        // reference is a description and initialized
+        osl_atomic_increment( &reinterpret_cast<typelib_TypeDescription *>(pRef)->nRefCount );
+        *ppRet = reinterpret_cast<typelib_TypeDescription *>(pRef);
+        return;
+    }
+
+    {
+    MutexGuard aGuard( Init().maMutex );
+    // pRef->pType->pWeakRef == 0 means that the description is empty
+    if( pRef->pType && pRef->pType->pWeakRef )
+    {
+        sal_Int32 n = osl_atomic_increment( &pRef->pType->nRefCount );
+        if( n > 1 )
+        {
+            // The reference is incremented. The object cannot be destroyed.
+            // Release the guard at the earliest point.
+            *ppRet = pRef->pType;
+            return;
+        }
+        (void)osl_atomic_decrement( &pRef->pType->nRefCount );
+        // destruction of this type in progress (another thread!)
+        // no access through this weak reference
+        pRef->pType = nullptr;
+    }
+    }
+
+    typelib_typedescription_getByName( ppRet, pRef->pTypeName );
+    OSL_ASSERT( !*ppRet || rtl_ustr_compare( pRef->pTypeName->buffer, (*ppRet)->pTypeName->buffer ) == 0 );
+    OSL_ASSERT( !*ppRet || pRef->eTypeClass == (*ppRet)->eTypeClass );
+    OSL_ASSERT( !*ppRet || pRef == (*ppRet)->pWeakRef );
+    pRef->pType = *ppRet;
+}
+
+
+extern "C" void typelib_typedescriptionreference_getByName(
+    typelib_TypeDescriptionReference ** ppRet, rtl_uString const * pName )
+    SAL_THROW_EXTERN_C()
+{
+    if( *ppRet )
+    {
+        typelib_typedescriptionreference_release( *ppRet );
+        *ppRet = nullptr;
+    }
+    TypeDescriptor_Init_Impl &rInit = Init();
+
+    MutexGuard aGuard( rInit.maMutex );
+    WeakMap_Impl::const_iterator aIt = rInit.maWeakMap.find( pName->buffer );
+    if( aIt == rInit.maWeakMap.end() )
+        return;
+
+    sal_Int32 n = osl_atomic_increment( &(*aIt).second->nRefCount );
+    if( n > 1 )
+    {
+        // The reference is incremented. The object cannot be destroyed.
+        // Release the guard at the earliest point.
+        *ppRet = (*aIt).second;
+    }
+    else
+    {
+        // destruction of this type in progress (another thread!)
+        // no access through this weak reference
+        (void)osl_atomic_decrement( &(*aIt).second->nRefCount );
+    }
+}
+
+
+extern "C" sal_Bool SAL_CALL typelib_typedescriptionreference_equals(
+    const typelib_TypeDescriptionReference * p1,
+    const typelib_TypeDescriptionReference * p2 )
+    SAL_THROW_EXTERN_C()
+{
+    return (p1 == p2 ||
+            (p1->eTypeClass == p2->eTypeClass &&
+             p1->pTypeName->length == p2->pTypeName->length &&
+             rtl_ustr_compare( p1->pTypeName->buffer, p2->pTypeName->buffer ) == 0));
+}
+
+
+extern "C" void SAL_CALL typelib_typedescriptionreference_assign(
+    typelib_TypeDescriptionReference ** ppDest,
+    typelib_TypeDescriptionReference * pSource )
+    SAL_THROW_EXTERN_C()
+{
+    if (*ppDest != pSource)
+    {
+        ::typelib_typedescriptionreference_acquire( pSource );
+        ::typelib_typedescriptionreference_release( *ppDest );
+        *ppDest = pSource;
+    }
+}
+
+
+extern "C" void SAL_CALL typelib_setCacheSize( sal_Int32 )
+    SAL_THROW_EXTERN_C()
+{
+}
+
+
+const bool s_aAssignableFromTab[11][11] =
+{
+                          /* from CH,    BO,    BY,    SH,    US,    LO,    UL,    HY,    UH,    FL,    DO */
+/* TypeClass_CHAR */            { true,  false, false, false, false, false, false, false, false, false, false },
+/* TypeClass_BOOLEAN */         { false, true,  false, false, false, false, false, false, false, false, false },
+/* TypeClass_BYTE */            { false, false, true,  false, false, false, false, false, false, false, false },
+/* TypeClass_SHORT */           { false, false, true,  true,  true,  false, false, false, false, false, false },
+/* TypeClass_UNSIGNED_SHORT */  { false, false, true,  true,  true,  false, false, false, false, false, false },
+/* TypeClass_LONG */            { false, false, true,  true,  true,  true,  true,  false, false, false, false },
+/* TypeClass_UNSIGNED_LONG */   { false, false, true,  true,  true,  true,  true,  false, false, false, false },
+/* TypeClass_HYPER */           { false, false, true,  true,  true,  true,  true,  true,  true,  false, false },
+/* TypeClass_UNSIGNED_HYPER */  { false, false, true,  true,  true,  true,  true,  true,  true,  false, false },
+/* TypeClass_FLOAT */           { false, false, true,  true,  true,  false, false, false, false, true,  false },
+/* TypeClass_DOUBLE */          { false, false, true,  true,  true,  true,  true,  false, false, true,  true  }
+};
+
+
+extern "C" sal_Bool SAL_CALL typelib_typedescriptionreference_isAssignableFrom(
+    typelib_TypeDescriptionReference * pAssignable,
+    typelib_TypeDescriptionReference * pFrom )
+    SAL_THROW_EXTERN_C()
+{
+    if (!pAssignable || !pFrom)
+        return false;
+
+    typelib_TypeClass eAssignable = pAssignable->eTypeClass;
+    typelib_TypeClass eFrom       = pFrom->eTypeClass;
+
+    if (eAssignable == typelib_TypeClass_ANY) // anything can be assigned to an any .)
+        return true;
+    if (eAssignable == eFrom)
+    {
+        if (type_equals( pAssignable, pFrom )) // first shot
+        {
+            return true;
+        }
+        switch (eAssignable)
+        {
+        case typelib_TypeClass_STRUCT:
+        case typelib_TypeClass_EXCEPTION:
+        {
+            typelib_TypeDescription * pFromDescr = nullptr;
+            TYPELIB_DANGER_GET( &pFromDescr, pFrom );
+            if (!reinterpret_cast<typelib_CompoundTypeDescription *>(pFromDescr)->pBaseTypeDescription)
+            {
+                TYPELIB_DANGER_RELEASE( pFromDescr );
+                return false;
+            }
+            bool bRet = typelib_typedescriptionreference_isAssignableFrom(
+                pAssignable,
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pFromDescr)->pBaseTypeDescription->aBase.pWeakRef );
+            TYPELIB_DANGER_RELEASE( pFromDescr );
+            return bRet;
+        }
+        case typelib_TypeClass_INTERFACE:
+        {
+            typelib_TypeDescription * pFromDescr = nullptr;
+            TYPELIB_DANGER_GET( &pFromDescr, pFrom );
+            typelib_InterfaceTypeDescription * pFromIfc
+                = reinterpret_cast<
+                    typelib_InterfaceTypeDescription * >(pFromDescr);
+            bool bRet = false;
+            for (sal_Int32 i = 0; i < pFromIfc->nBaseTypes; ++i) {
+                if (typelib_typedescriptionreference_isAssignableFrom(
+                        pAssignable,
+                        pFromIfc->ppBaseTypes[i]->aBase.pWeakRef))
+                {
+                    bRet = true;
+                    break;
+                }
+            }
+            TYPELIB_DANGER_RELEASE( pFromDescr );
+            return bRet;
+        }
+        default:
+        {
+            return false;
+        }
+        }
+    }
+    return (eAssignable >= typelib_TypeClass_CHAR && eAssignable <= typelib_TypeClass_DOUBLE &&
+            eFrom >= typelib_TypeClass_CHAR && eFrom <= typelib_TypeClass_DOUBLE &&
+            s_aAssignableFromTab[eAssignable-1][eFrom-1]);
+}
+
+extern "C" sal_Bool SAL_CALL typelib_typedescription_isAssignableFrom(
+    typelib_TypeDescription * pAssignable,
+    typelib_TypeDescription * pFrom )
+    SAL_THROW_EXTERN_C()
+{
+    return typelib_typedescriptionreference_isAssignableFrom(
+        pAssignable->pWeakRef, pFrom->pWeakRef );
+}
+
+
+extern "C" sal_Bool SAL_CALL typelib_typedescription_complete(
+    typelib_TypeDescription ** ppTypeDescr )
+    SAL_THROW_EXTERN_C()
+{
+    return complete(ppTypeDescr, true);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/typelib/typelib.hxx b/cppu/source/typelib/typelib.hxx
new file mode 100644
index 000000000..b62e763de
--- /dev/null
+++ b/cppu/source/typelib/typelib.hxx
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.h>
+#include <sal/types.h>
+#include <typelib/typeclass.h>
+#include <typelib/typedescription.h>
+
+extern "C" sal_Int32 typelib_typedescription_getAlignedUnoSize(
+    const typelib_TypeDescription * pTypeDescription,
+    sal_Int32 nOffset,
+    sal_Int32 & rMaxIntegralTypeSize )
+    SAL_THROW_EXTERN_C();
+
+
+extern "C" void typelib_typedescription_newEmpty(
+    typelib_TypeDescription ** ppRet,
+    typelib_TypeClass eTypeClass,
+    rtl_uString * pTypeName )
+    SAL_THROW_EXTERN_C();
+
+extern "C" void typelib_typedescriptionreference_getByName(
+    typelib_TypeDescriptionReference ** ppRet,
+    rtl_uString const * pName )
+    SAL_THROW_EXTERN_C();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/EnvDcp.cxx b/cppu/source/uno/EnvDcp.cxx
new file mode 100644
index 000000000..c5597dec4
--- /dev/null
+++ b/cppu/source/uno/EnvDcp.cxx
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <uno/EnvDcp.h>
+
+
+void uno_EnvDcp_getTypeName(rtl_uString const * pEnvDcp, rtl_uString ** ppEnvTypeName)
+{
+    sal_Int32 colIdx = rtl_ustr_indexOfChar_WithLength(pEnvDcp->buffer, pEnvDcp->length, ':');
+    if (colIdx >= 0)
+        rtl_uString_newFromStr_WithLength(ppEnvTypeName, pEnvDcp->buffer, colIdx);
+
+    else
+        rtl_uString_newFromStr(ppEnvTypeName, pEnvDcp->buffer);
+}
+
+void uno_EnvDcp_getPurpose(rtl_uString const * pEnvDcp, rtl_uString ** ppEnvPurpose)
+{
+    sal_Int32 colIdx = rtl_ustr_indexOfChar_WithLength(pEnvDcp->buffer, pEnvDcp->length, ':');
+    if (colIdx >= 0)
+        rtl_uString_newFromStr_WithLength(ppEnvPurpose, pEnvDcp->buffer + colIdx, pEnvDcp->length - colIdx);
+
+    else
+        rtl_uString_new(ppEnvPurpose);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/EnvStack.cxx b/cppu/source/uno/EnvStack.cxx
new file mode 100644
index 000000000..34fea77f4
--- /dev/null
+++ b/cppu/source/uno/EnvStack.cxx
@@ -0,0 +1,382 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <uno/environment.hxx>
+#include <uno/lbnames.h>
+
+#include <cppu/EnvDcp.hxx>
+#include <cppu/Enterable.hxx>
+
+#include <osl/thread.h>
+#include <osl/thread.hxx>
+#include <o3tl/string_view.hxx>
+
+#include <mutex>
+#include <unordered_map>
+
+using namespace com::sun::star;
+
+namespace {
+
+struct oslThreadIdentifier_equal
+{
+    bool operator()(oslThreadIdentifier s1, oslThreadIdentifier s2) const;
+};
+
+}
+
+bool oslThreadIdentifier_equal::operator()(oslThreadIdentifier s1, oslThreadIdentifier s2) const
+{
+    bool result = s1 == s2;
+
+    return result;
+}
+
+namespace {
+
+struct oslThreadIdentifier_hash
+{
+    size_t operator()(oslThreadIdentifier s1) const;
+};
+
+}
+
+size_t oslThreadIdentifier_hash::operator()(oslThreadIdentifier s1) const
+{
+    return s1;
+}
+
+typedef std::unordered_map<oslThreadIdentifier,
+                        uno_Environment *,
+                        oslThreadIdentifier_hash,
+                        oslThreadIdentifier_equal>  ThreadMap;
+
+namespace
+{
+    std::mutex s_threadMap_mutex;
+    ThreadMap s_threadMap;
+}
+
+static void s_setCurrent(uno_Environment * pEnv)
+{
+    oslThreadIdentifier threadId = osl::Thread::getCurrentIdentifier();
+
+    std::scoped_lock guard(s_threadMap_mutex);
+    if (pEnv)
+    {
+        s_threadMap[threadId] = pEnv;
+    }
+    else
+    {
+        ThreadMap::iterator iEnv = s_threadMap.find(threadId);
+        if( iEnv != s_threadMap.end())
+            s_threadMap.erase(iEnv);
+    }
+}
+
+static uno_Environment * s_getCurrent()
+{
+    uno_Environment * pEnv = nullptr;
+
+    oslThreadIdentifier threadId = osl::Thread::getCurrentIdentifier();
+
+    std::scoped_lock guard(s_threadMap_mutex);
+    ThreadMap::iterator iEnv = s_threadMap.find(threadId);
+    if(iEnv != s_threadMap.end())
+        pEnv = iEnv->second;
+
+    return pEnv;
+}
+
+
+extern "C" void SAL_CALL uno_getCurrentEnvironment(uno_Environment ** ppEnv, rtl_uString * pTypeName)
+    SAL_THROW_EXTERN_C()
+{
+    if (*ppEnv)
+    {
+        (*ppEnv)->release(*ppEnv);
+        *ppEnv = nullptr;
+    }
+
+    OUString currPurpose;
+
+    uno_Environment * pCurrEnv = s_getCurrent();
+    if (pCurrEnv) // no environment means no purpose
+        currPurpose = cppu::EnvDcp::getPurpose(pCurrEnv->pTypeName);
+
+    if (pTypeName && rtl_uString_getLength(pTypeName))
+    {
+        OUString envDcp = OUString::unacquired(&pTypeName) + currPurpose;
+
+        uno_getEnvironment(ppEnv, envDcp.pData, nullptr);
+    }
+    else
+    {
+        if (pCurrEnv)
+        {
+            *ppEnv = pCurrEnv;
+            (*ppEnv)->acquire(*ppEnv);
+        }
+        else
+        {
+            OUString uno_envDcp(UNO_LB_UNO);
+            uno_getEnvironment(ppEnv, uno_envDcp.pData, nullptr);
+        }
+    }
+}
+
+static OUString s_getPrefix(std::u16string_view str1, std::u16string_view str2)
+{
+    sal_Int32 nIndex1 = 0;
+    sal_Int32 nIndex2 = 0;
+    sal_Int32 sim = 0;
+
+    std::u16string_view token1;
+    std::u16string_view token2;
+
+    do
+    {
+        token1 = o3tl::getToken(str1, 0, ':', nIndex1);
+        token2 = o3tl::getToken(str2, 0, ':', nIndex2);
+
+        if (token1 == token2)
+            sim += token1.size() + 1;
+    }
+    while(nIndex1 == nIndex2 && nIndex1 >= 0 && token1 == token2);
+
+    OUString result;
+
+    if (sim)
+        result = str1.substr(0, sim - 1);
+
+    return result;
+}
+
+static int s_getNextEnv(uno_Environment ** ppEnv, uno_Environment * pCurrEnv, uno_Environment * pTargetEnv)
+{
+    int res = 0;
+
+    std::u16string_view nextPurpose;
+
+    OUString currPurpose;
+    if (pCurrEnv)
+        currPurpose = cppu::EnvDcp::getPurpose(pCurrEnv->pTypeName);
+
+    OUString targetPurpose;
+    if (pTargetEnv)
+        targetPurpose = cppu::EnvDcp::getPurpose(pTargetEnv->pTypeName);
+
+    OUString intermPurpose(s_getPrefix(currPurpose, targetPurpose));
+    if (currPurpose.getLength() > intermPurpose.getLength())
+    {
+        sal_Int32 idx = currPurpose.lastIndexOf(':');
+        nextPurpose = currPurpose.subView(0, idx);
+
+        res = -1;
+    }
+    else if (intermPurpose.getLength() < targetPurpose.getLength())
+    {
+        sal_Int32 idx = targetPurpose.indexOf(':', intermPurpose.getLength() + 1);
+        if (idx == -1)
+            nextPurpose = targetPurpose;
+
+        else
+            nextPurpose = targetPurpose.subView(0, idx);
+
+        res = 1;
+    }
+
+    if (!nextPurpose.empty())
+    {
+        OUString next_envDcp = OUString::Concat(UNO_LB_UNO) + nextPurpose;
+        uno_getEnvironment(ppEnv, next_envDcp.pData, nullptr);
+    }
+    else
+    {
+        if (*ppEnv)
+            (*ppEnv)->release(*ppEnv);
+
+        *ppEnv = nullptr;
+    }
+
+    return res;
+}
+
+extern "C" { static void s_pull(va_list * pParam)
+{
+    uno_EnvCallee * pCallee = va_arg(*pParam, uno_EnvCallee *);
+    va_list       * pXparam = va_arg(*pParam, va_list *);
+
+    pCallee(pXparam);
+}}
+
+static void s_callInto_v(uno_Environment * pEnv, uno_EnvCallee * pCallee, va_list * pParam)
+{
+    cppu::Enterable * pEnterable = static_cast<cppu::Enterable *>(pEnv->pReserved);
+    if (pEnterable)
+        pEnterable->callInto(s_pull, pCallee, pParam);
+
+    else
+        pCallee(pParam);
+}
+
+static void s_callInto(uno_Environment * pEnv, uno_EnvCallee * pCallee, ...)
+{
+    va_list param;
+
+    va_start(param, pCallee);
+    s_callInto_v(pEnv, pCallee, &param);
+    va_end(param);
+}
+
+static void s_callOut_v(uno_Environment * pEnv, uno_EnvCallee * pCallee, va_list * pParam)
+{
+    cppu::Enterable * pEnterable = static_cast<cppu::Enterable *>(pEnv->pReserved);
+    if (pEnterable)
+        pEnterable->callOut_v(pCallee, pParam);
+
+    else
+        pCallee(pParam);
+}
+
+static void s_callOut(uno_Environment * pEnv, uno_EnvCallee * pCallee, ...)
+{
+    va_list param;
+
+    va_start(param, pCallee);
+    s_callOut_v(pEnv, pCallee, &param);
+    va_end(param);
+}
+
+static void s_environment_invoke_v(uno_Environment *, uno_Environment *, uno_EnvCallee *, va_list *);
+
+extern "C" { static void s_environment_invoke_vv(va_list * pParam)
+{
+    uno_Environment * pCurrEnv    = va_arg(*pParam, uno_Environment *);
+    uno_Environment * pTargetEnv  = va_arg(*pParam, uno_Environment *);
+    uno_EnvCallee   * pCallee     = va_arg(*pParam, uno_EnvCallee *);
+    va_list         * pXparam     = va_arg(*pParam, va_list *);
+
+    s_environment_invoke_v(pCurrEnv, pTargetEnv, pCallee, pXparam);
+}}
+
+static void s_environment_invoke_v(uno_Environment * pCurrEnv, uno_Environment * pTargetEnv, uno_EnvCallee * pCallee, va_list * pParam)
+{
+    uno_Environment * pNextEnv = nullptr;
+    switch(s_getNextEnv(&pNextEnv, pCurrEnv, pTargetEnv))
+    {
+    case -1:
+        s_setCurrent(pNextEnv);
+        s_callOut(pCurrEnv, s_environment_invoke_vv, pNextEnv, pTargetEnv, pCallee, pParam);
+        s_setCurrent(pCurrEnv);
+        break;
+
+    case 0: {
+        uno_Environment * hld = s_getCurrent();
+        s_setCurrent(pCurrEnv);
+        pCallee(pParam);
+        s_setCurrent(hld);
+    }
+        break;
+
+    case 1:
+        s_setCurrent(pNextEnv);
+        s_callInto(pNextEnv, s_environment_invoke_vv, pNextEnv, pTargetEnv, pCallee, pParam);
+        s_setCurrent(pCurrEnv);
+        break;
+    }
+
+    if (pNextEnv)
+        pNextEnv->release(pNextEnv);
+}
+
+extern "C" void SAL_CALL uno_Environment_invoke_v(uno_Environment * pTargetEnv, uno_EnvCallee * pCallee, va_list * pParam)
+    SAL_THROW_EXTERN_C()
+{
+    s_environment_invoke_v(s_getCurrent(), pTargetEnv, pCallee, pParam);
+}
+
+extern "C" void SAL_CALL uno_Environment_invoke(uno_Environment * pEnv, uno_EnvCallee * pCallee, ...)
+    SAL_THROW_EXTERN_C()
+{
+    va_list param;
+
+    va_start(param, pCallee);
+    uno_Environment_invoke_v(pEnv, pCallee, &param);
+    va_end(param);
+}
+
+extern "C" void SAL_CALL uno_Environment_enter(uno_Environment * pTargetEnv)
+    SAL_THROW_EXTERN_C()
+{
+    uno_Environment * pNextEnv = nullptr;
+    uno_Environment * pCurrEnv = s_getCurrent();
+
+    int res;
+    while ( (res = s_getNextEnv(&pNextEnv, pCurrEnv, pTargetEnv)) != 0)
+    {
+        cppu::Enterable * pEnterable;
+
+        switch(res)
+        {
+        case -1:
+            pEnterable = static_cast<cppu::Enterable *>(pCurrEnv->pReserved);
+            if (pEnterable)
+                pEnterable->leave();
+            pCurrEnv->release(pCurrEnv);
+            break;
+
+        case 1:
+            pNextEnv->acquire(pNextEnv);
+            pEnterable = static_cast<cppu::Enterable *>(pNextEnv->pReserved);
+            if (pEnterable)
+                pEnterable->enter();
+            break;
+        }
+
+        s_setCurrent(pNextEnv);
+        pCurrEnv = pNextEnv;
+    }
+}
+
+int SAL_CALL uno_Environment_isValid(uno_Environment * pEnv, rtl_uString ** pReason)
+    SAL_THROW_EXTERN_C()
+{
+    int result = 1;
+
+    OUString typeName(cppu::EnvDcp::getTypeName(pEnv->pTypeName));
+    if (typeName == UNO_LB_UNO)
+    {
+        cppu::Enterable * pEnterable = static_cast<cppu::Enterable *>(pEnv->pReserved);
+        if (pEnterable)
+            result = pEnterable->isValid(reinterpret_cast<OUString *>(pReason));
+    }
+    else
+    {
+        OUString envDcp = UNO_LB_UNO + cppu::EnvDcp::getPurpose(pEnv->pTypeName);
+
+        uno::Environment env(envDcp);
+
+        result = env.isValid(reinterpret_cast<OUString *>(pReason));
+    }
+
+    return result;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/IdentityMapping.cxx b/cppu/source/uno/IdentityMapping.cxx
new file mode 100644
index 000000000..32ec32c07
--- /dev/null
+++ b/cppu/source/uno/IdentityMapping.cxx
@@ -0,0 +1,105 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "IdentityMapping.hxx"
+
+#include <typelib/typedescription.h>
+#include <uno/mapping.h>
+#include <uno/environment.hxx>
+#include <utility>
+
+#include <osl/interlck.h>
+
+
+using namespace ::com::sun::star;
+
+namespace {
+
+struct IdentityMapping : public uno_Mapping
+{
+    sal_Int32        m_nRef;
+    uno::Environment m_env;
+
+    explicit IdentityMapping(uno::Environment aEnv);
+};
+
+}
+
+extern "C"
+{
+
+static void s_free(uno_Mapping * pMapping)
+{
+    delete static_cast<IdentityMapping *>(pMapping);
+}
+
+static void s_acquire(uno_Mapping * pMapping)
+{
+    static OUString s_purpose;
+
+    if (1 == osl_atomic_increment(&static_cast<IdentityMapping *>(pMapping)->m_nRef))
+    {
+        uno_registerMapping(
+            &pMapping,
+            s_free,
+            static_cast<IdentityMapping *>(pMapping)->m_env.get(),
+            static_cast<IdentityMapping *>(pMapping)->m_env.get(),
+            s_purpose.pData);
+    }
+}
+
+static void s_release(uno_Mapping * pMapping)
+{
+    if (!osl_atomic_decrement(&static_cast<IdentityMapping *>(pMapping )->m_nRef))
+        uno_revokeMapping(pMapping);
+}
+
+static void s_mapInterface(uno_Mapping                       * pMapping,
+                                    void                             ** ppOut,
+                                    void                              * pInterface,
+                                    SAL_UNUSED_PARAMETER typelib_InterfaceTypeDescription * /*pInterfaceTypeDescr*/)
+{
+    *ppOut = pInterface;
+
+    if (pInterface)
+    {
+        IdentityMapping * that = static_cast<IdentityMapping *>(pMapping);
+
+        (that->m_env.get()->pExtEnv->acquireInterface)(that->m_env.get()->pExtEnv, pInterface);
+    }
+}
+}
+
+
+IdentityMapping::IdentityMapping(uno::Environment aEnv)
+    : m_nRef(0),
+      m_env(std::move(aEnv))
+{
+    uno_Mapping::acquire        = s_acquire;
+    uno_Mapping::release        = s_release;
+    uno_Mapping::mapInterface   = s_mapInterface;
+}
+
+
+uno_Mapping * createIdentityMapping(uno::Environment const & rEnv)
+{
+    return new IdentityMapping(rEnv);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/IdentityMapping.hxx b/cppu/source/uno/IdentityMapping.hxx
new file mode 100644
index 000000000..8ba081b00
--- /dev/null
+++ b/cppu/source/uno/IdentityMapping.hxx
@@ -0,0 +1,31 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <uno/mapping.h>
+
+namespace com::sun::star::uno
+{
+class Environment;
+}
+
+uno_Mapping* createIdentityMapping(const css::uno::Environment& rEnv);
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/any.cxx b/cppu/source/uno/any.cxx
new file mode 100644
index 000000000..e26b97286
--- /dev/null
+++ b/cppu/source/uno/any.cxx
@@ -0,0 +1,142 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include "copy.hxx"
+#include "destr.hxx"
+
+using namespace cppu;
+
+
+extern "C"
+{
+
+void SAL_CALL uno_type_any_assign(
+    uno_Any * pDest, void * pSource,
+    typelib_TypeDescriptionReference * pType,
+    uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    _destructAny( pDest, release );
+    if (pType)
+    {
+        _copyConstructAny( pDest, pSource, pType, nullptr, acquire, nullptr );
+    }
+    else
+    {
+        CONSTRUCT_EMPTY_ANY( pDest );
+    }
+}
+
+void SAL_CALL uno_any_assign(
+    uno_Any * pDest, void * pSource,
+    typelib_TypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    _destructAny( pDest, release );
+    if (pTypeDescr)
+    {
+        _copyConstructAny( pDest, pSource, pTypeDescr->pWeakRef, pTypeDescr, acquire, nullptr );
+    }
+    else
+    {
+        CONSTRUCT_EMPTY_ANY( pDest );
+    }
+}
+
+void SAL_CALL uno_type_any_construct(
+    uno_Any * pDest, void * pSource,
+    typelib_TypeDescriptionReference * pType,
+    uno_AcquireFunc acquire )
+    SAL_THROW_EXTERN_C()
+{
+    if (pType)
+    {
+        _copyConstructAny( pDest, pSource, pType, nullptr, acquire, nullptr );
+    }
+    else
+    {
+        CONSTRUCT_EMPTY_ANY( pDest );
+    }
+}
+
+void SAL_CALL uno_any_construct(
+    uno_Any * pDest, void * pSource,
+    typelib_TypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire )
+    SAL_THROW_EXTERN_C()
+{
+    if (pTypeDescr)
+    {
+        _copyConstructAny( pDest, pSource, pTypeDescr->pWeakRef, pTypeDescr, acquire, nullptr );
+    }
+    else
+    {
+        CONSTRUCT_EMPTY_ANY( pDest );
+    }
+}
+
+void SAL_CALL uno_type_any_constructAndConvert(
+    uno_Any * pDest, void * pSource,
+    typelib_TypeDescriptionReference * pType,
+    uno_Mapping * mapping )
+    SAL_THROW_EXTERN_C()
+{
+    if (pType)
+    {
+        _copyConstructAny( pDest, pSource, pType, nullptr, nullptr, mapping );
+    }
+    else
+    {
+        CONSTRUCT_EMPTY_ANY( pDest );
+    }
+}
+
+void SAL_CALL uno_any_constructAndConvert(
+    uno_Any * pDest, void * pSource,
+    typelib_TypeDescription * pTypeDescr,
+    uno_Mapping * mapping )
+    SAL_THROW_EXTERN_C()
+{
+    if (pTypeDescr)
+    {
+        _copyConstructAny( pDest, pSource, pTypeDescr->pWeakRef, pTypeDescr, nullptr, mapping );
+    }
+    else
+    {
+        CONSTRUCT_EMPTY_ANY( pDest );
+    }
+}
+
+void SAL_CALL uno_any_destruct( uno_Any * pValue, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    _destructAny( pValue, release );
+}
+
+void SAL_CALL uno_any_clear( uno_Any * pValue, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    _destructAny( pValue, release );
+    CONSTRUCT_EMPTY_ANY( pValue );
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/assign.hxx b/cppu/source/uno/assign.hxx
new file mode 100644
index 000000000..3e2893fde
--- /dev/null
+++ b/cppu/source/uno/assign.hxx
@@ -0,0 +1,449 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include "prim.hxx"
+#include "destr.hxx"
+#include "constr.hxx"
+#include "copy.hxx"
+
+
+namespace cppu
+{
+
+
+//#### assignment ##################################################################################
+
+
+inline void _assignInterface(
+    void ** ppDest, void * pSource,
+    uno_AcquireFunc acquire, uno_ReleaseFunc release )
+
+{
+    _acquire( pSource, acquire );
+    void * const pToBeReleased = *ppDest;
+    *ppDest = pSource;
+    _release( pToBeReleased, release );
+}
+
+inline void * _queryInterface(
+    void * pSource,
+    typelib_TypeDescriptionReference * pDestType,
+    uno_QueryInterfaceFunc queryInterface )
+{
+    if (pSource)
+    {
+        if (nullptr == queryInterface)
+            queryInterface = binuno_queryInterface;
+        pSource = (*queryInterface)( pSource, pDestType );
+    }
+    return pSource;
+}
+
+bool assignStruct(
+    void * pDest, void * pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_QueryInterfaceFunc queryInterface, uno_AcquireFunc acquire, uno_ReleaseFunc release );
+
+inline bool _assignStruct(
+    void * pDest, void * pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_QueryInterfaceFunc queryInterface, uno_AcquireFunc acquire, uno_ReleaseFunc release )
+{
+    if (pTypeDescr->pBaseTypeDescription)
+    {
+        // copy base value
+        if (! assignStruct( pDest, pSource, pTypeDescr->pBaseTypeDescription,
+                            queryInterface, acquire, release ))
+        {
+            return false;
+        }
+    }
+    // then copy members
+    typelib_TypeDescriptionReference ** ppTypeRefs = pTypeDescr->ppTypeRefs;
+    sal_Int32 * pMemberOffsets = pTypeDescr->pMemberOffsets;
+    sal_Int32 nDescr = pTypeDescr->nMembers;
+    while (nDescr--)
+    {
+        if (! ::uno_type_assignData( static_cast<char *>(pDest) + pMemberOffsets[nDescr],
+                                     ppTypeRefs[nDescr],
+                                     static_cast<char *>(pSource) + pMemberOffsets[nDescr],
+                                     ppTypeRefs[nDescr],
+                                     queryInterface, acquire, release ))
+        {
+            return false;
+        }
+    }
+    return true;
+}
+
+inline bool _assignData(
+    void * pDest,
+    typelib_TypeDescriptionReference * pDestType, typelib_TypeDescription * pDestTypeDescr,
+    void * pSource,
+    typelib_TypeDescriptionReference * pSourceType, typelib_TypeDescription * pSourceTypeDescr,
+    uno_QueryInterfaceFunc queryInterface, uno_AcquireFunc acquire, uno_ReleaseFunc release )
+{
+    if (pDest == pSource)
+        return _type_equals( pDestType, pSourceType );
+
+    if (! pSource)
+    {
+        _destructData( pDest, pDestType, pDestTypeDescr, release );
+        _defaultConstructData( pDest, pDestType, pDestTypeDescr );
+        return true;
+    }
+    while (typelib_TypeClass_ANY == pSourceType->eTypeClass)
+    {
+        pSourceTypeDescr = nullptr;
+        pSourceType = static_cast<uno_Any *>(pSource)->pType;
+        pSource = static_cast<uno_Any *>(pSource)->pData;
+        if (pDest == pSource)
+            return true;
+    }
+
+    switch (pDestType->eTypeClass)
+    {
+    case typelib_TypeClass_VOID:
+        return pSourceType->eTypeClass == typelib_TypeClass_VOID;
+    case typelib_TypeClass_CHAR:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_CHAR:
+            *static_cast<sal_Unicode *>(pDest) = *static_cast<sal_Unicode *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_BOOLEAN:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BOOLEAN:
+            *static_cast<sal_Bool *>(pDest) = bool(*static_cast<sal_Bool *>(pSource));
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_BYTE:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<sal_Int8 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_SHORT:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<sal_Int16 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<sal_Int16 *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<sal_uInt16 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<sal_uInt16 *>(pDest) = *static_cast<sal_uInt16 *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_LONG:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<sal_Int32 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+            *static_cast<sal_Int32 *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<sal_Int32 *>(pDest) = *static_cast<sal_uInt16 *>(pSource);
+            return true;
+        case typelib_TypeClass_LONG:
+        case typelib_TypeClass_UNSIGNED_LONG:
+            *static_cast<sal_Int32 *>(pDest) = *static_cast<sal_Int32 *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_UNSIGNED_LONG:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<sal_uInt32 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+            *static_cast<sal_uInt32 *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<sal_uInt32 *>(pDest) = *static_cast<sal_uInt16 *>(pSource);
+            return true;
+        case typelib_TypeClass_LONG:
+        case typelib_TypeClass_UNSIGNED_LONG:
+            *static_cast<sal_uInt32 *>(pDest) = *static_cast<sal_uInt32 *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_HYPER:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<sal_Int64 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+            *static_cast<sal_Int64 *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<sal_Int64 *>(pDest) = *static_cast<sal_uInt16 *>(pSource);
+            return true;
+        case typelib_TypeClass_LONG:
+            *static_cast<sal_Int64 *>(pDest) = *static_cast<sal_Int32 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_LONG:
+            *static_cast<sal_Int64 *>(pDest) = *static_cast<sal_uInt32 *>(pSource);
+            return true;
+        case typelib_TypeClass_HYPER:
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            *static_cast<sal_Int64 *>(pDest) = *static_cast<sal_Int64 *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<sal_uInt64 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+            *static_cast<sal_uInt64 *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<sal_uInt64 *>(pDest) = *static_cast<sal_uInt16 *>(pSource);
+            return true;
+        case typelib_TypeClass_LONG:
+            *static_cast<sal_uInt64 *>(pDest) = *static_cast<sal_Int32 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_LONG:
+            *static_cast<sal_uInt64 *>(pDest) = *static_cast<sal_uInt32 *>(pSource);
+            return true;
+        case typelib_TypeClass_HYPER:
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            *static_cast<sal_uInt64 *>(pDest) = *static_cast<sal_uInt64 *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_FLOAT:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<float *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+            *static_cast<float *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<float *>(pDest) = *static_cast<sal_uInt16 *>(pSource);
+            return true;
+        case typelib_TypeClass_FLOAT:
+            *static_cast<float *>(pDest) = *static_cast<float *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_DOUBLE:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            *static_cast<double *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+            return true;
+        case typelib_TypeClass_SHORT:
+            *static_cast<double *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            *static_cast<double *>(pDest) = *static_cast<sal_uInt16 *>(pSource);
+            return true;
+        case typelib_TypeClass_LONG:
+            *static_cast<double *>(pDest) = *static_cast<sal_Int32 *>(pSource);
+            return true;
+        case typelib_TypeClass_UNSIGNED_LONG:
+            *static_cast<double *>(pDest) = *static_cast<sal_uInt32 *>(pSource);
+            return true;
+        case typelib_TypeClass_FLOAT:
+            *static_cast<double *>(pDest) = *static_cast<float *>(pSource);
+            return true;
+        case typelib_TypeClass_DOUBLE:
+            *static_cast<double *>(pDest) = *static_cast<double *>(pSource);
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_STRING:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_STRING:
+            ::rtl_uString_assign( static_cast<rtl_uString **>(pDest), *static_cast<rtl_uString **>(pSource) );
+            return true;
+        default:
+            return false;
+        }
+    case typelib_TypeClass_TYPE:
+        switch (pSourceType->eTypeClass)
+        {
+        case typelib_TypeClass_TYPE:
+        {
+            typelib_TypeDescriptionReference ** pp = static_cast<typelib_TypeDescriptionReference **>(pDest);
+            ::typelib_typedescriptionreference_release( *pp );
+            *pp = *static_cast<typelib_TypeDescriptionReference **>(pSource);
+            TYPE_ACQUIRE( *pp );
+            return true;
+        }
+        default:
+            return false;
+        }
+    case typelib_TypeClass_ANY:
+        _destructAny( static_cast<uno_Any *>(pDest), release );
+        _copyConstructAny( static_cast<uno_Any *>(pDest), pSource, pSourceType, pSourceTypeDescr, acquire, nullptr );
+        return true;
+    case typelib_TypeClass_ENUM:
+        if (_type_equals( pDestType, pSourceType ))
+        {
+            *static_cast<sal_Int32 *>(pDest) = *static_cast<sal_Int32 *>(pSource);
+            return true;
+        }
+        return false;
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+        if (typelib_TypeClass_STRUCT == pSourceType->eTypeClass ||
+            typelib_TypeClass_EXCEPTION == pSourceType->eTypeClass)
+        {
+            bool bRet = false;
+            if (pSourceTypeDescr)
+            {
+                typelib_CompoundTypeDescription * pTypeDescr =
+                    reinterpret_cast<typelib_CompoundTypeDescription *>(pSourceTypeDescr);
+                while (pTypeDescr &&
+                       !_type_equals(pTypeDescr->aBase.pWeakRef, pDestType))
+                {
+                    pTypeDescr = pTypeDescr->pBaseTypeDescription;
+                }
+                if (pTypeDescr)
+                {
+                    bRet = _assignStruct(
+                        pDest, pSource, pTypeDescr, queryInterface, acquire, release );
+                }
+            }
+            else
+            {
+                TYPELIB_DANGER_GET( &pSourceTypeDescr, pSourceType );
+                typelib_CompoundTypeDescription * pTypeDescr =
+                    reinterpret_cast<typelib_CompoundTypeDescription *>(pSourceTypeDescr);
+                while (pTypeDescr &&
+                       !_type_equals(pTypeDescr->aBase.pWeakRef, pDestType))
+                {
+                    pTypeDescr = pTypeDescr->pBaseTypeDescription;
+                }
+                if (pTypeDescr)
+                {
+                    bRet = _assignStruct(
+                        pDest, pSource, pTypeDescr, queryInterface, acquire, release );
+                }
+                TYPELIB_DANGER_RELEASE( pSourceTypeDescr );
+            }
+            return bRet;
+        }
+        return false;
+    case typelib_TypeClass_SEQUENCE:
+        if (!_type_equals( pDestType, pSourceType ))
+            return false;
+        // check self assignment (only after _type_equals, to account for shared static empty):
+        if (*static_cast<uno_Sequence **>(pSource) != *static_cast<uno_Sequence **>(pDest))
+        {
+            osl_atomic_increment( &(*static_cast<uno_Sequence **>(pSource))->nRefCount );
+            idestructSequence(
+                *static_cast<uno_Sequence **>(pDest), pDestType, pDestTypeDescr, release );
+            *static_cast<uno_Sequence **>(pDest) = *static_cast<uno_Sequence **>(pSource);
+        }
+        return true;
+    case typelib_TypeClass_INTERFACE:
+        if (typelib_TypeClass_INTERFACE != pSourceType->eTypeClass)
+            return false;
+        if (_type_equals( pDestType, pSourceType ))
+        {
+            _assignInterface( static_cast<void **>(pDest), *static_cast<void **>(pSource), acquire, release );
+            return true;
+        }
+        else if (*static_cast< void ** >(pSource) == nullptr)
+        {
+            // A null reference of any interface type can be converted to a null
+            // reference of any other interface type:
+            void * const pToBeReleased = *static_cast< void ** >(pDest);
+            *static_cast< void ** >(pDest) = nullptr;
+            _release( pToBeReleased, release );
+            return true;
+        }
+        else
+        {
+            if (pSourceTypeDescr)
+            {
+                typelib_TypeDescription * pTD = pSourceTypeDescr;
+                while (pTD && !_type_equals( pTD->pWeakRef, pDestType ))
+                {
+                    pTD = &reinterpret_cast<typelib_InterfaceTypeDescription *>(pTD)->pBaseTypeDescription->aBase;
+                }
+                if (pTD) // is base of dest
+                {
+                    _assignInterface( static_cast<void **>(pDest), *static_cast<void **>(pSource), acquire, release );
+                    return true;
+                }
+            }
+
+            // query for interface:
+            void * pQueried = _queryInterface( *static_cast<void **>(pSource),
+                                               pDestType, queryInterface );
+            if (pQueried != nullptr) {
+                void * const pToBeReleased = *static_cast<void **>(pDest);
+                *static_cast<void **>(pDest) = pQueried;
+                _release( pToBeReleased, release );
+            }
+            return (pQueried != nullptr);
+        }
+    default:
+        OSL_ASSERT(false);
+        return false;
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/cascade_mapping.cxx b/cppu/source/uno/cascade_mapping.cxx
new file mode 100644
index 000000000..f03d88e52
--- /dev/null
+++ b/cppu/source/uno/cascade_mapping.cxx
@@ -0,0 +1,308 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <osl/interlck.h>
+#include <rtl/ustring.hxx>
+#include <uno/environment.hxx>
+#include <uno/lbnames.h>
+#include <uno/mapping.hxx>
+#include <uno/dispatcher.h>
+#include <o3tl/string_view.hxx>
+
+#include <cppu/EnvDcp.hxx>
+
+#include "cascade_mapping.hxx"
+
+using namespace com::sun::star;
+
+namespace {
+
+class MediatorMapping : public uno_Mapping
+{
+    oslInterlockedCount m_refCount;
+
+    uno::Mapping        m_from2uno;
+    uno::Mapping        m_uno2to;
+
+    uno::Environment    m_from;
+    uno::Environment    m_interm;
+    uno::Environment    m_to;
+
+public:
+    void acquire();
+    void release();
+
+    void mapInterface(void                            ** ppOut,
+                      void                             * pInterface,
+                      typelib_InterfaceTypeDescription * pInterfaceTypeDescr);
+    MediatorMapping(uno_Environment * pFrom,
+                    uno_Environment * pInterm,
+                    uno_Environment * pTo);
+};
+
+}
+
+extern "C" {
+static void s_acquire(uno_Mapping * mapping)
+{
+    MediatorMapping * pMediatorMapping = static_cast<MediatorMapping *>(mapping);
+    pMediatorMapping->acquire();
+}
+
+static void s_release(uno_Mapping * mapping)
+{
+    MediatorMapping * pMediatorMapping = static_cast<MediatorMapping *>(mapping);
+    pMediatorMapping->release();
+}
+
+static void s_mapInterface(
+    uno_Mapping                      * mapping,
+    void                            ** ppOut,
+    void                             * pInterface,
+    typelib_InterfaceTypeDescription * pInterfaceTypeDescr)
+{
+    MediatorMapping   * pMediatorMapping  = static_cast<MediatorMapping *>(mapping);
+    pMediatorMapping->mapInterface(ppOut, pInterface, pInterfaceTypeDescr);
+}
+}
+
+MediatorMapping::MediatorMapping(uno_Environment * pFrom,
+                                 uno_Environment * pInterm,
+                                 uno_Environment * pTo)
+    : m_refCount(0),
+      m_from2uno(pFrom, pInterm),
+      m_uno2to  (pInterm, pTo),
+      m_from    (pFrom),
+      m_interm  (pInterm),
+      m_to      (pTo)
+{
+    if (!m_from2uno.get() || !m_uno2to.get())
+        abort();
+
+    uno_Mapping::acquire      = s_acquire;
+    uno_Mapping::release      = s_release;
+    uno_Mapping::mapInterface = s_mapInterface;
+}
+
+void MediatorMapping::acquire()
+{
+    osl_atomic_increment(&m_refCount);
+}
+
+void MediatorMapping::release()
+{
+    if (osl_atomic_decrement(&m_refCount) == 0)
+    {
+        ::uno_revokeMapping(this);
+    }
+}
+
+extern "C" { static void s_mapInterface_v(va_list * pParam)
+{
+    void                            ** ppOut               = va_arg(*pParam, void **);
+    void                             * pInterface          = va_arg(*pParam, void *);
+    typelib_InterfaceTypeDescription * pInterfaceTypeDescr = va_arg(*pParam, typelib_InterfaceTypeDescription *);
+    uno_Mapping                      * pMapping            = va_arg(*pParam, uno_Mapping *);
+
+    pMapping->mapInterface(pMapping, ppOut, pInterface, pInterfaceTypeDescr);
+}}
+
+void MediatorMapping::mapInterface(
+    void                            ** ppOut,
+    void                             * pInterface,
+    typelib_InterfaceTypeDescription * pInterfaceTypeDescr)
+{
+    if (*ppOut != nullptr)
+    {
+        uno_ExtEnvironment * env = m_to.get()->pExtEnv;
+        OSL_ASSERT( env != nullptr );
+        env->releaseInterface( env, *ppOut );
+        *ppOut = nullptr;
+    }
+
+    void * ret = nullptr;
+    uno_Interface * pUnoI = nullptr;
+
+    m_from.invoke(s_mapInterface_v, &pUnoI, pInterface, pInterfaceTypeDescr, m_from2uno.get());
+
+    m_uno2to.mapInterface(&ret, pUnoI, pInterfaceTypeDescr);
+
+    if (pUnoI)
+        m_interm.get()->pExtEnv->releaseInterface(m_interm.get()->pExtEnv, pUnoI);
+
+    *ppOut = ret;
+}
+
+extern "C" { static void s_MediatorMapping_free(uno_Mapping * pMapping)
+    SAL_THROW_EXTERN_C()
+{
+    delete static_cast<MediatorMapping *>(pMapping);
+}}
+
+
+static OUString getPrefix(std::u16string_view str1, std::u16string_view str2)
+{
+    sal_Int32 nIndex1 = 0;
+    sal_Int32 nIndex2 = 0;
+    sal_Int32 sim = 0;
+
+    std::u16string_view token1;
+    std::u16string_view token2;
+
+    do
+    {
+        token1 = o3tl::getToken(str1, 0, ':', nIndex1);
+        token2 = o3tl::getToken(str2, 0, ':', nIndex2);
+
+        if (token1 == token2)
+            sim += token1.size() + 1;
+    }
+    while(nIndex1 == nIndex2 && nIndex1 >= 0 && token1 == token2);
+
+    OUString result;
+
+    if (sim)
+        result = str1.substr(0, sim - 1);
+
+    return result;
+}
+
+//  OUString str1("abc:def:ghi");
+//  OUString str2("abc:def");
+//  OUString str3("abc");
+//  OUString str4("");
+
+//  OUString pref;
+
+//  pref = getPrefix(str1, str1);
+//  pref = getPrefix(str1, str2);
+//  pref = getPrefix(str1, str3);
+//  pref = getPrefix(str1, str4);
+
+//  pref = getPrefix(str2, str1);
+//  pref = getPrefix(str3, str1);
+//  pref = getPrefix(str4, str1);
+
+
+void getCascadeMapping(uno_Mapping     ** ppMapping,
+                       uno_Environment  * pFrom,
+                       uno_Environment  * pTo,
+                       rtl_uString      * pAddPurpose)
+{
+    if (pAddPurpose && pAddPurpose->length)
+        return;
+
+    OUString uno_envType(UNO_LB_UNO);
+
+    OUString from_envType    = cppu::EnvDcp::getTypeName(pFrom->pTypeName);
+    OUString to_envType      = cppu::EnvDcp::getTypeName(pTo->pTypeName);
+    OUString from_envPurpose = cppu::EnvDcp::getPurpose(pFrom->pTypeName);
+    OUString to_envPurpose   = cppu::EnvDcp::getPurpose(pTo->pTypeName);
+
+#ifdef LOG_CALLING_named_purpose_getMapping
+    OString s_from_name = OUStringToOString(pFrom->pTypeName, RTL_TEXTENCODING_ASCII_US);
+    OString s_to_name   = OUStringToOString(pTo->pTypeName,   RTL_TEXTENCODING_ASCII_US);
+
+    std::cerr << __FUNCTION__ << " - creating mediation ";
+    std::cerr << "pFrom: " << s_from_name.getStr();
+    std::cerr <<" pTo: "   << s_to_name.getStr() << std::endl;
+#endif
+
+    if (from_envPurpose == to_envPurpose) // gcc:bla => uno:bla
+        return;
+
+    // reaching this point means, we need a mediated mapping!!!
+    // we generally mediate via uno[:free]
+    uno_Environment * pInterm = nullptr;
+
+    // chained uno -> uno
+    if (from_envType == uno_envType && to_envType == uno_envType)
+    {
+        OUString purpose = getPrefix(from_envPurpose, to_envPurpose);
+
+        OUString uno_envDcp = uno_envType + purpose;
+
+        // direct mapping possible?
+        // uno:bla-->uno:bla:blubb
+        if (from_envPurpose == purpose)
+        {
+            OUString rest = to_envPurpose.copy(purpose.getLength());
+
+            sal_Int32 index = rest.indexOf(':', 1);
+            if (index == -1)
+            {
+                uno_getMapping(ppMapping, pFrom, pTo, rest.copy(1).pData);
+                return;
+            }
+
+            uno_envDcp += rest.subView(0, index);
+        }
+        else if (to_envPurpose == purpose)
+        {
+            OUString rest = from_envPurpose.copy(purpose.getLength());
+
+            sal_Int32 index = rest.indexOf(':', 1);
+            if (index == -1)
+            {
+                uno_getMapping(ppMapping, pFrom, pTo, rest.copy(1).pData);
+                return;
+            }
+
+            uno_envDcp += rest.subView(0, index);
+        }
+
+        uno_getEnvironment(&pInterm, uno_envDcp.pData, nullptr);
+    }
+    else if (from_envType != uno_envType && to_envType == uno_envType) // <ANY> -> UNO ?
+        // mediate via uno:purpose(fromEnv)
+    {
+        OUString     envDcp = uno_envType + from_envPurpose;
+        uno_getEnvironment(&pInterm, envDcp.pData, nullptr);
+    }
+    else if (from_envType == uno_envType && to_envType != uno_envType) // UNO -> <ANY>?
+        // mediate via uno(context)
+    {
+        OUString     envDcp = uno_envType + to_envPurpose;
+        uno_getEnvironment(&pInterm, envDcp.pData, nullptr);
+    }
+    else // everything else
+        // mediate via uno:purpose
+    {
+        OUString purpose = getPrefix(from_envPurpose, to_envPurpose);
+
+        OUString uno_envDcp = uno_envType + purpose;
+
+        uno_getEnvironment(&pInterm, uno_envDcp.pData, nullptr);
+    }
+
+    uno_Mapping * pMapping = new MediatorMapping(pFrom, pInterm, pTo);
+    pInterm->release(pInterm);
+
+
+    pMapping->acquire(pMapping);
+
+    ::uno_registerMapping(&pMapping, s_MediatorMapping_free, pFrom, pTo, pAddPurpose);
+
+    if (*ppMapping)
+        (*ppMapping)->release(*ppMapping);
+
+    *ppMapping = pMapping;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/cascade_mapping.hxx b/cppu/source/uno/cascade_mapping.hxx
new file mode 100644
index 000000000..438143f6b
--- /dev/null
+++ b/cppu/source/uno/cascade_mapping.hxx
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <uno/environment.h>
+#include <uno/mapping.h>
+#include <rtl/ustring.h>
+
+
+void getCascadeMapping(uno_Mapping     ** ppMapping,
+                       uno_Environment  * pFrom,
+                       uno_Environment  * pTo,
+                       rtl_uString      * pAddPurpose );
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/check.cxx b/cppu/source/uno/check.cxx
new file mode 100644
index 000000000..561434aa5
--- /dev/null
+++ b/cppu/source/uno/check.cxx
@@ -0,0 +1,335 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cassert>
+
+#include <cppu/macros.hxx>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <uno/any2.h>
+
+
+namespace {
+
+#if defined( _WIN32)
+#pragma pack(push, 8)
+#endif
+
+struct C1
+{
+    sal_Int16 n1;
+};
+struct C2 : public C1
+{
+    sal_Int32 n2 CPPU_GCC3_ALIGN( C1 );
+};
+struct C3 : public C2
+{
+    double d3;
+    sal_Int32 n3;
+};
+struct C4 : public C3
+{
+    sal_Int32 n4 CPPU_GCC3_ALIGN( C3 );
+    double d4;
+};
+struct C5 : public C4
+{
+    sal_Int64 n5;
+    sal_Bool b5;
+};
+struct C6 : public C1
+{
+    C5 c6 CPPU_GCC3_ALIGN( C1 );
+    sal_Bool b6;
+};
+
+struct D
+{
+    sal_Int16 d;
+    sal_Int32 e;
+};
+struct E
+{
+    // [-loplugin:fakebool] false positive:
+    sal_Bool a;
+    // [-loplugin:fakebool] false positive:
+    sal_Bool b;
+    // [-loplugin:fakebool] false positive:
+    sal_Bool c;
+    sal_Int16 d;
+    sal_Int32 e;
+};
+
+struct M
+{
+    sal_Int32   n;
+    sal_Int16   o;
+};
+
+struct N : public M
+{
+    sal_Int16   p CPPU_GCC3_ALIGN( M );
+};
+struct N2
+{
+    M m;
+    sal_Int16   p;
+};
+
+struct O : public M
+{
+    double  p;
+    sal_Int16 q;
+};
+struct O2 : public O
+{
+    sal_Int16 p2 CPPU_GCC3_ALIGN( O );
+};
+
+struct P : public N
+{
+    double  p2;
+};
+
+struct empty
+{
+};
+struct second : public empty
+{
+    int a;
+};
+
+struct AlignSize_Impl
+{
+    sal_Int16   nInt16;
+    double      dDouble;
+};
+
+struct Char1
+{
+    char c1;
+};
+struct Char2 : public Char1
+{
+    char c2 CPPU_GCC3_ALIGN( Char1 );
+};
+struct Char3 : public Char2
+{
+    char c3 CPPU_GCC3_ALIGN( Char2 );
+};
+enum Enum
+{
+    v = SAL_MAX_ENUM
+};
+
+#ifdef _WIN32
+#   pragma pack(pop)
+#endif
+
+// [-loplugin:fakebool] false positive:
+static_assert( static_cast<sal_Bool>(true) == sal_True,
+               "must be binary compatible" );
+// [-loplugin:fakebool] false positive:
+static_assert( static_cast<sal_Bool>(false) == sal_False,
+               "must be binary compatible" );
+#if SAL_TYPES_ALIGNMENT8 == 2
+static_assert(offsetof(AlignSize_Impl, dDouble) == 2, "offsetof(AlignSize_Impl, dDouble) != 2");
+static_assert(sizeof(AlignSize_Impl) == 10, "sizeof(AlignSize_Impl) != 10");
+#elif SAL_TYPES_ALIGNMENT8 == 4
+static_assert(offsetof(AlignSize_Impl, dDouble) == 4, "offsetof(AlignSize_Impl, dDouble) != 4");
+static_assert(sizeof(AlignSize_Impl) == 12, "sizeof(AlignSize_Impl) != 12");
+#elif SAL_TYPES_ALIGNMENT8 == 8
+static_assert(offsetof(AlignSize_Impl, dDouble) == 8, "offsetof(AlignSize_Impl, dDouble) != 8");
+static_assert(sizeof(AlignSize_Impl) == 16, "sizeof(AlignSize_Impl) != 16");
+#else
+# error unexpected alignment of 8 byte types
+#endif
+
+// sequence
+static_assert((SAL_SEQUENCE_HEADER_SIZE % 8) == 0, "binary compatibility test failed: (SAL_SEQUENCE_HEADER_SIZE % 8) == 0!!!");
+// enum
+static_assert(sizeof(Enum) == sizeof(sal_Int32), "binary compatibility test failed: (sizeof(Enum) == sizeof(sal_Int32))");
+// any
+static_assert(sizeof(void *) >= sizeof(sal_Int32), "binary compatibility test failed: (sizeof(void *) >= sizeof(sal_Int32))");
+static_assert(sizeof(uno_Any) == sizeof(void *) * 3, "binary compatibility test failed: (sizeof(uno_Any) == sizeof(void *) * 3");
+static_assert(offsetof(uno_Any, pType) == 0, "offsetof(uno_Any, pType) != 0");
+static_assert(offsetof(uno_Any, pData) == 1 * sizeof(void *), "offsetof(uno_Any, pTData) != (1 * sizeof(void *))");
+static_assert(offsetof(uno_Any, pReserved) == 2 * sizeof(void *), "offsetof(uno_Any, pReserved) != (2 * sizeof(void *))");
+// string
+static_assert(sizeof(OUString) == sizeof(rtl_uString *), "binary compatibility test failed: sizeof(OUString) != sizeof(rtl_uString *)");
+// struct
+#if SAL_TYPES_ALIGNMENT8 == 2
+static_assert(sizeof(M) == 6, "sizeof(M) != 6");
+static_assert(sizeof(N) == 8, "sizeof(N) != 8");
+static_assert(sizeof(N2) == 8, "sizeof(N2) != 8");
+static_assert(offsetof(N2, p) == 6, "offsetof(N2, p) != 6");
+#else
+static_assert(sizeof(M) == 8, "sizeof(M) != 8");
+static_assert(sizeof(N) == 12, "sizeof(N) != 12");
+static_assert(sizeof(N2) == 12, "sizeof(N2) != 12");
+static_assert(offsetof(N2, p) == 8, "offsetof(N2, p) != 8");
+#endif
+static_assert(offsetof(M, o) == 4, "offsetof(M, o) != 4");
+
+#if SAL_TYPES_ALIGNMENT8 == 2
+static_assert(sizeof(O) == 16, "sizeof(O) != 16");
+#elif SAL_TYPES_ALIGNMENT8 == 4
+static_assert(sizeof(O) == 20, "sizeof(O) != 20");
+#elif SAL_TYPES_ALIGNMENT8 == 8
+static_assert(sizeof(O) == 24, "sizeof(O) != 24");
+#else
+# error unexpected alignment of 8 byte types
+#endif
+
+#if SAL_TYPES_ALIGNMENT8 == 2
+static_assert(sizeof(C2) == 6, "sizeof(C2) != 6");
+static_assert(sizeof(D) == 6, "sizeof(D) != 6");
+static_assert(offsetof(D, e) == 2, "offsetof(D, e) != 2");
+static_assert(offsetof(E, e) == 6, "offsetof(E, e) != 6");
+#else
+static_assert(sizeof(C2) == 8, "sizeof(C2) != 8");
+static_assert(sizeof(D) == 8, "sizeof(D) != 8");
+static_assert(offsetof(D, e) == 4, "offsetof(D, e) != 4");
+static_assert(offsetof(E, e) == 8, "offsetof(E, e) != 8");
+#endif
+
+static_assert(sizeof(C1) == 2, "sizeof(C1) != 2");
+static_assert(offsetof(E, d) == 4, "offsetof(E, d) != 4");
+
+#if SAL_TYPES_ALIGNMENT8 == 2
+static_assert(sizeof(C3) == 18, "sizeof(C3) != 18");
+static_assert(sizeof(C4) == 30, "sizeof(C4) != 30");
+static_assert(sizeof(C5) == 40, "sizeof(C5) != 40");
+static_assert(sizeof(C6) == 44, "sizeof(C6) != 44");
+
+static_assert(sizeof(O2) == 18, "sizeof(O2) != 18");
+#elif SAL_TYPES_ALIGNMENT8 == 4
+static_assert(sizeof(C3) == 20, "sizeof(C3) != 20");
+static_assert(sizeof(C4) == 32, "sizeof(C4) != 32");
+static_assert(sizeof(C5) == 44, "sizeof(C5) != 44");
+static_assert(sizeof(C6) == 52, "sizeof(C6) != 52");
+
+static_assert(sizeof(O2) == 24, "sizeof(O2) != 24");
+#elif SAL_TYPES_ALIGNMENT8 == 8
+static_assert(sizeof(C3) == 24, "sizeof(C3) != 24");
+static_assert(sizeof(C4) == 40, "sizeof(C4) != 40");
+static_assert(sizeof(C5) == 56, "sizeof(C5) != 56");
+static_assert(sizeof(C6) == 72, "sizeof(C6) != 72");
+
+static_assert(sizeof(O2) == 32, "sizeof(O2) != 32");
+#else
+# error unexpected alignment of 8 byte types
+#endif
+
+static_assert(sizeof(Char3) == 3, "sizeof(Char3) != 3");
+
+#if SAL_TYPES_ALIGNMENT8 == 2
+// max alignment is 2
+static_assert(sizeof(P) == 16, "sizeof(P) != 16");
+#elif SAL_TYPES_ALIGNMENT8 == 4
+// max alignment is 4
+static_assert(sizeof(P) == 20, "sizeof(P) != 20");
+#elif SAL_TYPES_ALIGNMENT8 == 8
+// alignment of P is 8, because of P[] ...
+static_assert(sizeof(P) == 24, "sizeof(P) != 24");
+static_assert(sizeof(second) == sizeof(int), "sizeof(second) != sizeof(int)");
+#else
+# error unexpected alignment of 8 byte types
+#endif
+
+#if OSL_DEBUG_LEVEL > 0 && !defined NDEBUG
+
+struct Char4
+{
+#if defined __GNUC__ && (__GNUC__ < 12 || (__GNUC__ == 12 && __GNUC_MINOR__ < 1)) && !defined __clang__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wattributes"
+#endif
+    [[maybe_unused]] Char3 chars;
+#if defined __GNUC__ && (__GNUC__ < 12 || (__GNUC__ == 12 && __GNUC_MINOR__ < 1)) && !defined __clang__
+#pragma GCC diagnostic pop
+#endif
+    char c;
+};
+
+template<typename T1, typename T2> std::size_t OFFSET_OF(T2 T1::* p) {
+    return reinterpret_cast< size_t >(reinterpret_cast<char *>(&(reinterpret_cast<T1 *>(16)->*p)) -16);
+}
+
+class BinaryCompatible_Impl
+{
+public:
+    BinaryCompatible_Impl();
+};
+BinaryCompatible_Impl::BinaryCompatible_Impl()
+{
+    assert(OFFSET_OF(&N::p) == 8);
+
+    assert(OFFSET_OF(&C2::n2) == 4);
+
+#if SAL_TYPES_ALIGNMENT8 == 2
+    assert(OFFSET_OF(&C3::d3) == 6);
+    assert(OFFSET_OF(&C3::n3) == 14);
+    assert(OFFSET_OF(&C4::n4) == 18);
+    assert(OFFSET_OF(&C4::d4) == 22);
+    assert(OFFSET_OF(&C5::n5) == 30);
+    assert(OFFSET_OF(&C5::b5) == 38);
+    assert(OFFSET_OF(&C6::c6) == 2);
+    assert(OFFSET_OF(&C6::b6) == 42);
+
+    assert(OFFSET_OF(&O2::p2) == 16);
+#elif SAL_TYPES_ALIGNMENT8 == 4
+    assert(OFFSET_OF(&C3::d3) == 8);
+    assert(OFFSET_OF(&C3::n3) == 16);
+    assert(OFFSET_OF(&C4::n4) == 20);
+    assert(OFFSET_OF(&C4::d4) == 24);
+    assert(OFFSET_OF(&C5::n5) == 32);
+    assert(OFFSET_OF(&C5::b5) == 40);
+    assert(OFFSET_OF(&C6::c6) == 4);
+    assert(OFFSET_OF(&C6::b6) == 48);
+
+    assert(OFFSET_OF(&O2::p2) == 20);
+#elif SAL_TYPES_ALIGNMENT8 == 8
+    assert(OFFSET_OF(&C3::d3) == 8);
+    assert(OFFSET_OF(&C3::n3) == 16);
+    assert(OFFSET_OF(&C4::n4) == 24);
+    assert(OFFSET_OF(&C4::d4) == 32);
+    assert(OFFSET_OF(&C5::n5) == 40);
+    assert(OFFSET_OF(&C5::b5) == 48);
+    assert(OFFSET_OF(&C6::c6) == 8);
+    assert(OFFSET_OF(&C6::b6) == 64);
+
+    assert(OFFSET_OF(&O2::p2) == 24);
+#else
+# error unexpected alignment of 8 byte types
+#endif
+
+    assert(OFFSET_OF(&Char4::c) == 3);
+}
+
+BinaryCompatible_Impl aTest;
+
+#endif
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/constr.hxx b/cppu/source/uno/constr.hxx
new file mode 100644
index 000000000..9ca2eebf8
--- /dev/null
+++ b/cppu/source/uno/constr.hxx
@@ -0,0 +1,138 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include "prim.hxx"
+#include <osl/diagnose.h>
+
+namespace cppu
+{
+
+
+//#### construction ################################################################################
+
+
+void defaultConstructStruct(
+    void * pMem,
+    typelib_CompoundTypeDescription * pCompType );
+
+inline void _defaultConstructStruct(
+    void * pMem,
+    typelib_CompoundTypeDescription * pTypeDescr )
+{
+    if (pTypeDescr->pBaseTypeDescription)
+    {
+        defaultConstructStruct( pMem, pTypeDescr->pBaseTypeDescription );
+    }
+
+    typelib_TypeDescriptionReference ** ppTypeRefs = pTypeDescr->ppTypeRefs;
+    sal_Int32 * pMemberOffsets = pTypeDescr->pMemberOffsets;
+    sal_Int32 nDescr = pTypeDescr->nMembers;
+
+    while (nDescr--)
+    {
+        ::uno_type_constructData( static_cast<char *>(pMem) + pMemberOffsets[nDescr], ppTypeRefs[nDescr] );
+    }
+}
+
+
+inline void _defaultConstructData(
+    void * pMem,
+    typelib_TypeDescriptionReference * pType,
+    typelib_TypeDescription * pTypeDescr )
+{
+    switch (pType->eTypeClass)
+    {
+    case typelib_TypeClass_CHAR:
+        *static_cast<sal_Unicode *>(pMem) = '\0';
+        break;
+    case typelib_TypeClass_BOOLEAN:
+        *static_cast<sal_Bool *>(pMem) = false;
+        break;
+    case typelib_TypeClass_BYTE:
+        *static_cast<sal_Int8 *>(pMem) = 0;
+        break;
+    case typelib_TypeClass_SHORT:
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        *static_cast<sal_Int16 *>(pMem) = 0;
+        break;
+    case typelib_TypeClass_LONG:
+    case typelib_TypeClass_UNSIGNED_LONG:
+        *static_cast<sal_Int32 *>(pMem) = 0;
+        break;
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        *static_cast<sal_Int64 *>(pMem) = 0;
+        break;
+    case typelib_TypeClass_FLOAT:
+        *static_cast<float *>(pMem) = 0.0;
+        break;
+    case typelib_TypeClass_DOUBLE:
+        *static_cast<double *>(pMem) = 0.0;
+        break;
+    case typelib_TypeClass_STRING:
+        *static_cast<rtl_uString **>(pMem) = nullptr;
+        ::rtl_uString_new( static_cast<rtl_uString **>(pMem) );
+        break;
+    case typelib_TypeClass_TYPE:
+        *static_cast<typelib_TypeDescriptionReference **>(pMem) = _getVoidType();
+        break;
+    case typelib_TypeClass_ANY:
+        CONSTRUCT_EMPTY_ANY( static_cast<uno_Any *>(pMem) );
+        break;
+    case typelib_TypeClass_ENUM:
+        if (pTypeDescr)
+        {
+            *static_cast<sal_Int32 *>(pMem) = reinterpret_cast<typelib_EnumTypeDescription *>(pTypeDescr)->nDefaultEnumValue;
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            *static_cast<sal_Int32 *>(pMem) = reinterpret_cast<typelib_EnumTypeDescription *>(pTypeDescr)->nDefaultEnumValue;
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+        break;
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+        if (pTypeDescr)
+        {
+            _defaultConstructStruct( pMem, reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr) );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            _defaultConstructStruct( pMem, reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr) );
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+        break;
+    case typelib_TypeClass_SEQUENCE:
+        *static_cast<uno_Sequence **>(pMem) = createEmptySequence();
+        break;
+    case typelib_TypeClass_INTERFACE:
+        *static_cast<void **>(pMem) = nullptr; // either cpp or c-uno interface
+        break;
+    default:
+        OSL_ASSERT(false);
+        break;
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/copy.hxx b/cppu/source/uno/copy.hxx
new file mode 100644
index 000000000..6a71d413f
--- /dev/null
+++ b/cppu/source/uno/copy.hxx
@@ -0,0 +1,655 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include "prim.hxx"
+#include "constr.hxx"
+#include <cassert>
+#include <cstddef>
+#include <cstdlib>
+#include <type_traits>
+
+namespace cppu
+{
+
+
+//#### copy construction ###########################################################################
+
+namespace {
+
+// The non-dynamic prefix of sal_Sequence (aka uno_Sequence):
+struct SequencePrefix {
+    sal_Int32 nRefCount;
+    sal_Int32 nElements;
+};
+static_assert(sizeof (SequencePrefix) < sizeof (uno_Sequence));
+static_assert(offsetof(SequencePrefix, nRefCount) == offsetof(uno_Sequence, nRefCount));
+static_assert(
+    std::is_same_v<decltype(SequencePrefix::nRefCount), decltype(uno_Sequence::nRefCount)>);
+static_assert(offsetof(SequencePrefix, nElements) == offsetof(uno_Sequence, nElements));
+static_assert(
+    std::is_same_v<decltype(SequencePrefix::nElements), decltype(uno_Sequence::nElements)>);
+
+}
+
+inline uno_Sequence * allocSeq(
+    sal_Int32 nElementSize, sal_Int32 nElements )
+{
+    OSL_ASSERT( nElements >= 0 && nElementSize >= 0 );
+    uno_Sequence * pSeq = nullptr;
+    sal_uInt32 nSize = calcSeqMemSize( nElementSize, nElements );
+    if (nSize > 0)
+    {
+        pSeq = static_cast<uno_Sequence *>(std::malloc( nSize ));
+        if (pSeq != nullptr)
+        {
+            // header init, going via SequencePrefix to avoid UBSan insufficient-object-size
+            // warnings when `nElements == 0` and thus `nSize < sizeof (uno_Sequence)`:
+            auto const header = reinterpret_cast<SequencePrefix *>(pSeq);
+            header->nRefCount = 1;
+            header->nElements = nElements;
+        }
+    }
+    return pSeq;
+}
+
+
+void copyConstructStruct(
+    void * pDest, void * pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_Mapping * mapping );
+
+inline void _copyConstructStruct(
+    void * pDest, void * pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_Mapping * mapping )
+{
+    if (pTypeDescr->pBaseTypeDescription)
+    {
+        // copy base value
+        copyConstructStruct( pDest, pSource, pTypeDescr->pBaseTypeDescription, acquire, mapping );
+    }
+
+    // then copy members
+    typelib_TypeDescriptionReference ** ppTypeRefs = pTypeDescr->ppTypeRefs;
+    sal_Int32 * pMemberOffsets = pTypeDescr->pMemberOffsets;
+    sal_Int32 nDescr = pTypeDescr->nMembers;
+
+    if (mapping)
+    {
+        while (nDescr--)
+        {
+            ::uno_type_copyAndConvertData(
+                static_cast<char *>(pDest) + pMemberOffsets[nDescr],
+                static_cast<char *>(pSource) + pMemberOffsets[nDescr],
+                ppTypeRefs[nDescr], mapping );
+        }
+    }
+    else
+    {
+        while (nDescr--)
+        {
+            ::uno_type_copyData(
+                static_cast<char *>(pDest) + pMemberOffsets[nDescr],
+                static_cast<char *>(pSource) + pMemberOffsets[nDescr],
+                ppTypeRefs[nDescr], acquire );
+        }
+    }
+}
+
+
+uno_Sequence * copyConstructSequence(
+    uno_Sequence * pSource,
+    typelib_TypeDescriptionReference * pElementType,
+    uno_AcquireFunc acquire, uno_Mapping * mapping );
+
+
+inline void _copyConstructAnyFromData(
+    uno_Any * pDestAny, void * pSource,
+    typelib_TypeDescriptionReference * pType, typelib_TypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_Mapping * mapping )
+{
+    TYPE_ACQUIRE( pType );
+    pDestAny->pType = pType;
+
+    switch (pType->eTypeClass)
+    {
+    case typelib_TypeClass_CHAR:
+        pDestAny->pData = &pDestAny->pReserved;
+        *static_cast<sal_Unicode *>(pDestAny->pData) = *static_cast<sal_Unicode *>(pSource);
+        break;
+    case typelib_TypeClass_BOOLEAN:
+        pDestAny->pData = &pDestAny->pReserved;
+        *static_cast<sal_Bool *>(pDestAny->pData) = bool(*static_cast<sal_Bool *>(pSource));
+        break;
+    case typelib_TypeClass_BYTE:
+        pDestAny->pData = &pDestAny->pReserved;
+        *static_cast<sal_Int8 *>(pDestAny->pData) = *static_cast<sal_Int8 *>(pSource);
+        break;
+    case typelib_TypeClass_SHORT:
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        pDestAny->pData = &pDestAny->pReserved;
+        *static_cast<sal_Int16 *>(pDestAny->pData) = *static_cast<sal_Int16 *>(pSource);
+        break;
+    case typelib_TypeClass_LONG:
+    case typelib_TypeClass_UNSIGNED_LONG:
+        pDestAny->pData = &pDestAny->pReserved;
+        *static_cast<sal_Int32 *>(pDestAny->pData) = *static_cast<sal_Int32 *>(pSource);
+        break;
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        if (sizeof(void *) >= sizeof(sal_Int64))
+            pDestAny->pData = &pDestAny->pReserved;
+        else
+            pDestAny->pData = std::malloc( sizeof(sal_Int64) );
+        assert(pDestAny->pData);
+        *static_cast<sal_Int64 *>(pDestAny->pData) = *static_cast<sal_Int64 *>(pSource);
+        break;
+    case typelib_TypeClass_FLOAT:
+        if (sizeof(void *) >= sizeof(float))
+            pDestAny->pData = &pDestAny->pReserved;
+        else
+            pDestAny->pData = std::malloc( sizeof(float) );
+        assert(pDestAny->pData);
+        *static_cast<float *>(pDestAny->pData) = *static_cast<float *>(pSource);
+        break;
+    case typelib_TypeClass_DOUBLE:
+        if (sizeof(void *) >= sizeof(double))
+            pDestAny->pData = &pDestAny->pReserved;
+        else
+            pDestAny->pData = std::malloc( sizeof(double) );
+        assert(pDestAny->pData);
+        *static_cast<double *>(pDestAny->pData) = *static_cast<double *>(pSource);
+        break;
+    case typelib_TypeClass_STRING:
+        ::rtl_uString_acquire( *static_cast<rtl_uString **>(pSource) );
+        pDestAny->pData = &pDestAny->pReserved;
+        *static_cast<rtl_uString **>(pDestAny->pData) = *static_cast<rtl_uString **>(pSource);
+        break;
+    case typelib_TypeClass_TYPE:
+        TYPE_ACQUIRE( *static_cast<typelib_TypeDescriptionReference **>(pSource) );
+        pDestAny->pData = &pDestAny->pReserved;
+        *static_cast<typelib_TypeDescriptionReference **>(pDestAny->pData) = *static_cast<typelib_TypeDescriptionReference **>(pSource);
+        break;
+    case typelib_TypeClass_ANY:
+        OSL_FAIL( "### unexpected nested any!" );
+        break;
+    case typelib_TypeClass_ENUM:
+        pDestAny->pData = &pDestAny->pReserved;
+        // enum is forced to 32bit long
+        *static_cast<sal_Int32 *>(pDestAny->pData) = *static_cast<sal_Int32 *>(pSource);
+        break;
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+        if (pTypeDescr)
+        {
+            pDestAny->pData = std::malloc( pTypeDescr->nSize );
+            _copyConstructStruct(
+                pDestAny->pData, pSource,
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr),
+                acquire, mapping );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            pDestAny->pData = std::malloc( pTypeDescr->nSize );
+            _copyConstructStruct(
+                pDestAny->pData, pSource,
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr),
+                acquire, mapping );
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+        break;
+    case typelib_TypeClass_SEQUENCE:
+        pDestAny->pData = &pDestAny->pReserved;
+        if (pTypeDescr)
+        {
+            *static_cast<uno_Sequence **>(pDestAny->pData) = copyConstructSequence(
+                *static_cast<uno_Sequence **>(pSource),
+                reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+                acquire, mapping );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            *static_cast<uno_Sequence **>(pDestAny->pData) = copyConstructSequence(
+                *static_cast<uno_Sequence **>(pSource),
+                reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+                acquire, mapping );
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+        break;
+    case typelib_TypeClass_INTERFACE:
+        pDestAny->pData = &pDestAny->pReserved;
+        if (mapping)
+        {
+            pDestAny->pReserved = _map( *static_cast<void **>(pSource), pType, pTypeDescr, mapping );
+        }
+        else
+        {
+            pDestAny->pReserved = *static_cast<void **>(pSource);
+            _acquire( pDestAny->pReserved, acquire );
+        }
+        break;
+    default:
+        OSL_ASSERT(false);
+        break;
+    }
+}
+
+inline void _copyConstructAny(
+    uno_Any * pDestAny, void * pSource,
+    typelib_TypeDescriptionReference * pType, typelib_TypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_Mapping * mapping )
+{
+    if (typelib_TypeClass_VOID == pType->eTypeClass)
+    {
+        CONSTRUCT_EMPTY_ANY( pDestAny );
+    }
+    else
+    {
+        if (typelib_TypeClass_ANY == pType->eTypeClass)
+        {
+            if (pSource)
+            {
+                pType = static_cast<uno_Any *>(pSource)->pType;
+                if (typelib_TypeClass_VOID == pType->eTypeClass)
+                {
+                    CONSTRUCT_EMPTY_ANY( pDestAny );
+                    return;
+                }
+                pTypeDescr = nullptr;
+                pSource = static_cast<uno_Any *>(pSource)->pData;
+            }
+            else
+            {
+                CONSTRUCT_EMPTY_ANY( pDestAny );
+                return;
+            }
+        }
+        if (pSource)
+        {
+            _copyConstructAnyFromData( pDestAny, pSource, pType, pTypeDescr, acquire, mapping );
+        }
+        else // default construct
+        {
+            TYPE_ACQUIRE( pType );
+            pDestAny->pType = pType;
+            switch (pType->eTypeClass)
+            {
+            case typelib_TypeClass_CHAR:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<sal_Unicode *>(pDestAny->pData) = '\0';
+                break;
+            case typelib_TypeClass_BOOLEAN:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<sal_Bool *>(pDestAny->pData) = false;
+                break;
+            case typelib_TypeClass_BYTE:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<sal_Int8 *>(pDestAny->pData) = 0;
+                break;
+            case typelib_TypeClass_SHORT:
+            case typelib_TypeClass_UNSIGNED_SHORT:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<sal_Int16 *>(pDestAny->pData) = 0;
+                break;
+            case typelib_TypeClass_LONG:
+            case typelib_TypeClass_UNSIGNED_LONG:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<sal_Int32 *>(pDestAny->pData) = 0;
+                break;
+            case typelib_TypeClass_HYPER:
+            case typelib_TypeClass_UNSIGNED_HYPER:
+                if (sizeof(void *) >= sizeof(sal_Int64))
+                    pDestAny->pData = &pDestAny->pReserved;
+                else
+                    pDestAny->pData = std::malloc( sizeof(sal_Int64) );
+                assert(pDestAny->pData);
+                *static_cast<sal_Int64 *>(pDestAny->pData) = 0;
+                break;
+            case typelib_TypeClass_FLOAT:
+                if (sizeof(void *) >= sizeof(float))
+                    pDestAny->pData = &pDestAny->pReserved;
+                else
+                    pDestAny->pData = std::malloc( sizeof(float) );
+                assert(pDestAny->pData);
+                *static_cast<float *>(pDestAny->pData) = 0.0;
+                break;
+            case typelib_TypeClass_DOUBLE:
+                if (sizeof(void *) >= sizeof(double))
+                    pDestAny->pData = &pDestAny->pReserved;
+                else
+                    pDestAny->pData = std::malloc( sizeof(double) );
+                assert(pDestAny->pData);
+                *static_cast<double *>(pDestAny->pData) = 0.0;
+                break;
+            case typelib_TypeClass_STRING:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<rtl_uString **>(pDestAny->pData) = nullptr;
+                ::rtl_uString_new( static_cast<rtl_uString **>(pDestAny->pData) );
+                break;
+            case typelib_TypeClass_TYPE:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<typelib_TypeDescriptionReference **>(pDestAny->pData) = _getVoidType();
+                break;
+            case typelib_TypeClass_ENUM:
+                pDestAny->pData = &pDestAny->pReserved;
+                if (pTypeDescr)
+                {
+                    *static_cast<sal_Int32 *>(pDestAny->pData) = reinterpret_cast<typelib_EnumTypeDescription *>(pTypeDescr)->nDefaultEnumValue;
+                }
+                else
+                {
+                    TYPELIB_DANGER_GET( &pTypeDescr, pType );
+                    *static_cast<sal_Int32 *>(pDestAny->pData) = reinterpret_cast<typelib_EnumTypeDescription *>(pTypeDescr)->nDefaultEnumValue;
+                    TYPELIB_DANGER_RELEASE( pTypeDescr );
+                }
+                break;
+            case typelib_TypeClass_STRUCT:
+            case typelib_TypeClass_EXCEPTION:
+                if (pTypeDescr)
+                {
+                    pDestAny->pData = std::malloc( pTypeDescr->nSize );
+                    _defaultConstructStruct(
+                        pDestAny->pData, reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr) );
+                }
+                else
+                {
+                    TYPELIB_DANGER_GET( &pTypeDescr, pType );
+                    pDestAny->pData = std::malloc( pTypeDescr->nSize );
+                    _defaultConstructStruct(
+                        pDestAny->pData, reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr) );
+                    TYPELIB_DANGER_RELEASE( pTypeDescr );
+                }
+                break;
+            case typelib_TypeClass_SEQUENCE:
+                pDestAny->pData = &pDestAny->pReserved;
+                *static_cast<uno_Sequence **>(pDestAny->pData) = createEmptySequence();
+                break;
+            case typelib_TypeClass_INTERFACE:
+                pDestAny->pData = &pDestAny->pReserved;
+                pDestAny->pReserved = nullptr; // either cpp or c-uno interface
+                break;
+            default:
+                OSL_ASSERT(false);
+                break;
+            }
+        }
+    }
+}
+
+inline uno_Sequence * icopyConstructSequence(
+    uno_Sequence * pSource,
+    typelib_TypeDescriptionReference * pElementType,
+    uno_AcquireFunc acquire, uno_Mapping * mapping )
+{
+    typelib_TypeClass eTypeClass = pElementType->eTypeClass;
+    if (!mapping ||
+        (eTypeClass <= typelib_TypeClass_ENUM &&
+         eTypeClass != typelib_TypeClass_ANY))
+    {
+        osl_atomic_increment( &pSource->nRefCount );
+        return pSource;
+    }
+    else // create new sequence
+    {
+        uno_Sequence * pDest;
+        sal_Int32 nElements = pSource->nElements;
+        if (nElements)
+        {
+            switch (eTypeClass)
+            {
+            case typelib_TypeClass_ANY:
+            {
+                pDest = allocSeq( sizeof (uno_Any), nElements );
+                if (pDest != nullptr)
+                {
+                    uno_Any * pDestElements = reinterpret_cast<uno_Any *>(pDest->elements);
+                    uno_Any * pSourceElements = reinterpret_cast<uno_Any *>(pSource->elements);
+                    for ( sal_Int32 nPos = nElements; nPos--; )
+                    {
+                        typelib_TypeDescriptionReference * pType =
+                            pSourceElements[nPos].pType;
+                        if (typelib_TypeClass_VOID == pType->eTypeClass)
+                        {
+                            CONSTRUCT_EMPTY_ANY( &pDestElements[nPos] );
+                        }
+                        else
+                        {
+                            _copyConstructAnyFromData(
+                                &pDestElements[nPos],
+                                pSourceElements[nPos].pData,
+                                pType, nullptr,
+                                acquire, mapping );
+                        }
+                    }
+                }
+                break;
+            }
+            case typelib_TypeClass_STRUCT:
+            case typelib_TypeClass_EXCEPTION:
+            {
+                typelib_TypeDescription * pElementTypeDescr = nullptr;
+                TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+                sal_Int32 nElementSize = pElementTypeDescr->nSize;
+                char * pSourceElements = pSource->elements;
+                pDest = allocSeq( nElementSize, nElements );
+                if (pDest != nullptr)
+                {
+                    char * pElements = pDest->elements;
+                    for ( sal_Int32 nPos = nElements; nPos--; )
+                    {
+                        _copyConstructStruct(
+                            pElements + (nPos * nElementSize),
+                            pSourceElements + (nPos * nElementSize),
+                            reinterpret_cast<typelib_CompoundTypeDescription *>(
+                                pElementTypeDescr),
+                            acquire, mapping );
+                    }
+                }
+                TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+                break;
+            }
+            case typelib_TypeClass_SEQUENCE: // sequence of sequence
+            {
+                // coverity[suspicious_sizeof] - sizeof(uno_Sequence*) is correct here
+                pDest = allocSeq( sizeof (uno_Sequence *), nElements );
+                if (pDest != nullptr)
+                {
+                    typelib_TypeDescription * pElementTypeDescr = nullptr;
+                    TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+                    typelib_TypeDescriptionReference * pSeqElementType =
+                        reinterpret_cast<typelib_IndirectTypeDescription *>(
+                            pElementTypeDescr)->pType;
+
+                    uno_Sequence ** pDestElements =
+                        reinterpret_cast<uno_Sequence **>(pDest->elements);
+                    uno_Sequence ** pSourceElements =
+                        reinterpret_cast<uno_Sequence **>(pSource->elements);
+                    for ( sal_Int32 nPos = nElements; nPos--; )
+                    {
+                        uno_Sequence * pNew = copyConstructSequence(
+                            pSourceElements[nPos],
+                            pSeqElementType,
+                            acquire, mapping );
+                        OSL_ASSERT( pNew != nullptr );
+                        // ought never be a memory allocation problem,
+                        // because of reference counted sequence handles
+                        pDestElements[ nPos ] = pNew;
+                    }
+
+                    TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+                }
+                break;
+            }
+            case typelib_TypeClass_INTERFACE:
+            {
+                pDest = allocSeq( sizeof (void *), nElements );
+                if (pDest != nullptr)
+                {
+                    char * pElements = pDest->elements;
+                    void ** pSourceElements = reinterpret_cast<void **>(pSource->elements);
+                    typelib_TypeDescription * pElementTypeDescr = nullptr;
+                    TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+                    for ( sal_Int32 nPos = nElements; nPos--; )
+                    {
+                        reinterpret_cast<void **>(pElements)[nPos] = nullptr;
+                        if (pSourceElements[nPos])
+                        {
+                            (*mapping->mapInterface)(
+                                mapping, reinterpret_cast<void **>(pElements) + nPos,
+                                pSourceElements[nPos],
+                                reinterpret_cast<typelib_InterfaceTypeDescription *>(
+                                    pElementTypeDescr) );
+                        }
+                    }
+                    TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+                }
+                break;
+            }
+            default:
+                OSL_FAIL( "### unexpected sequence element type!" );
+                pDest = nullptr;
+                break;
+            }
+        }
+        else // empty sequence
+        {
+            pDest = allocSeq( 0, 0 );
+        }
+
+        return pDest;
+    }
+}
+
+
+inline void _copyConstructData(
+    void * pDest, void * pSource,
+    typelib_TypeDescriptionReference * pType, typelib_TypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_Mapping * mapping )
+{
+    switch (pType->eTypeClass)
+    {
+    case typelib_TypeClass_CHAR:
+        *static_cast<sal_Unicode *>(pDest) = *static_cast<sal_Unicode *>(pSource);
+        break;
+    case typelib_TypeClass_BOOLEAN:
+        *static_cast<sal_Bool *>(pDest) = bool(*static_cast<sal_Bool *>(pSource));
+        break;
+    case typelib_TypeClass_BYTE:
+        *static_cast<sal_Int8 *>(pDest) = *static_cast<sal_Int8 *>(pSource);
+        break;
+    case typelib_TypeClass_SHORT:
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        *static_cast<sal_Int16 *>(pDest) = *static_cast<sal_Int16 *>(pSource);
+        break;
+    case typelib_TypeClass_LONG:
+    case typelib_TypeClass_UNSIGNED_LONG:
+        *static_cast<sal_Int32 *>(pDest) = *static_cast<sal_Int32 *>(pSource);
+        break;
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        *static_cast<sal_Int64 *>(pDest) = *static_cast<sal_Int64 *>(pSource);
+        break;
+    case typelib_TypeClass_FLOAT:
+        *static_cast<float *>(pDest) = *static_cast<float *>(pSource);
+        break;
+    case typelib_TypeClass_DOUBLE:
+        *static_cast<double *>(pDest) = *static_cast<double *>(pSource);
+        break;
+    case typelib_TypeClass_STRING:
+        ::rtl_uString_acquire( *static_cast<rtl_uString **>(pSource) );
+        *static_cast<rtl_uString **>(pDest) = *static_cast<rtl_uString **>(pSource);
+        break;
+    case typelib_TypeClass_TYPE:
+        TYPE_ACQUIRE( *static_cast<typelib_TypeDescriptionReference **>(pSource) );
+        *static_cast<typelib_TypeDescriptionReference **>(pDest) = *static_cast<typelib_TypeDescriptionReference **>(pSource);
+        break;
+    case typelib_TypeClass_ANY:
+        _copyConstructAny(
+            static_cast<uno_Any *>(pDest), static_cast<uno_Any *>(pSource)->pData,
+            static_cast<uno_Any *>(pSource)->pType, nullptr,
+            acquire, mapping );
+        break;
+    case typelib_TypeClass_ENUM:
+        *static_cast<sal_Int32 *>(pDest) = *static_cast<sal_Int32 *>(pSource);
+        break;
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+        if (pTypeDescr)
+        {
+            _copyConstructStruct(
+                pDest, pSource,
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr),
+                acquire, mapping );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            _copyConstructStruct(
+                pDest, pSource,
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr),
+                acquire, mapping );
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+        break;
+    case typelib_TypeClass_SEQUENCE:
+        if (mapping)
+        {
+            if (pTypeDescr)
+            {
+                *static_cast<uno_Sequence **>(pDest) = icopyConstructSequence(
+                    *static_cast<uno_Sequence **>(pSource),
+                    reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+                    acquire, mapping );
+            }
+            else
+            {
+                TYPELIB_DANGER_GET( &pTypeDescr, pType );
+                *static_cast<uno_Sequence **>(pDest) = icopyConstructSequence(
+                    *static_cast<uno_Sequence **>(pSource),
+                    reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+                    acquire, mapping );
+                TYPELIB_DANGER_RELEASE( pTypeDescr );
+            }
+        }
+        else
+        {
+            osl_atomic_increment( &(*static_cast<uno_Sequence **>(pSource))->nRefCount );
+            *static_cast<uno_Sequence **>(pDest) = *static_cast<uno_Sequence **>(pSource);
+        }
+        break;
+    case typelib_TypeClass_INTERFACE:
+        if (mapping)
+            *static_cast<void **>(pDest) = _map( *static_cast<void **>(pSource), pType, pTypeDescr, mapping );
+        else
+        {
+            *static_cast<void **>(pDest) = *static_cast<void **>(pSource);
+            _acquire( *static_cast<void **>(pDest), acquire );
+        }
+        break;
+    default:
+        break;
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/data.cxx b/cppu/source/uno/data.cxx
new file mode 100644
index 000000000..339e650fe
--- /dev/null
+++ b/cppu/source/uno/data.cxx
@@ -0,0 +1,316 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <sal/log.hxx>
+#include <uno/data.h>
+
+#include "constr.hxx"
+#include "destr.hxx"
+#include "copy.hxx"
+#include "assign.hxx"
+#include "eq.hxx"
+
+using namespace ::cppu;
+
+namespace cppu
+{
+
+// Sequence<>() (default ctor) relies on this being static:
+uno_Sequence g_emptySeq = { 1, 0, { 0 } };
+typelib_TypeDescriptionReference * g_pVoidType = nullptr;
+
+
+void * binuno_queryInterface( void * pUnoI, typelib_TypeDescriptionReference * pDestType )
+{
+    // init queryInterface() td
+    static typelib_TypeDescription* g_pQITD = []() {
+        typelib_TypeDescriptionReference* type_XInterface
+            = *typelib_static_type_getByTypeClass(typelib_TypeClass_INTERFACE);
+        typelib_InterfaceTypeDescription* pTXInterfaceDescr = nullptr;
+        TYPELIB_DANGER_GET(reinterpret_cast<typelib_TypeDescription**>(&pTXInterfaceDescr),
+                           type_XInterface);
+        assert(pTXInterfaceDescr->ppAllMembers);
+        typelib_TypeDescription* pQITD = nullptr;
+        typelib_typedescriptionreference_getDescription(&pQITD,
+                                                        pTXInterfaceDescr->ppAllMembers[0]);
+        // coverity[callee_ptr_arith] - not a bug
+        TYPELIB_DANGER_RELEASE(&pTXInterfaceDescr->aBase);
+        return pQITD;
+    }();
+
+    uno_Any aRet, aExc;
+    uno_Any * pExc = &aExc;
+    void * aArgs[ 1 ];
+    aArgs[ 0 ] = &pDestType;
+    (*static_cast<uno_Interface *>(pUnoI)->pDispatcher)(
+        static_cast<uno_Interface *>(pUnoI), g_pQITD, &aRet, aArgs, &pExc );
+
+    uno_Interface * ret = nullptr;
+    if (nullptr == pExc)
+    {
+        typelib_TypeDescriptionReference * ret_type = aRet.pType;
+        switch (ret_type->eTypeClass)
+        {
+        case typelib_TypeClass_VOID: // common case
+            typelib_typedescriptionreference_release( ret_type );
+            break;
+        case typelib_TypeClass_INTERFACE:
+            // tweaky... avoiding acquire/ release pair
+            typelib_typedescriptionreference_release( ret_type );
+            ret = static_cast<uno_Interface *>(aRet.pReserved); // serving acquired interface
+            break;
+        default:
+            _destructAny( &aRet, nullptr );
+            break;
+        }
+    }
+    else
+    {
+        SAL_WARN(
+            "cppu",
+            "exception occurred querying for interface "
+                << OUString(pDestType->pTypeName) << ": ["
+                << OUString(pExc->pType->pTypeName) << "] "
+                << *static_cast<OUString const *>(pExc->pData));
+                    // Message is very first member
+        uno_any_destruct( pExc, nullptr );
+    }
+    return ret;
+}
+
+
+void defaultConstructStruct(
+    void * pMem,
+    typelib_CompoundTypeDescription * pCompType )
+{
+    _defaultConstructStruct( pMem, pCompType );
+}
+
+void copyConstructStruct(
+    void * pDest, void * pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_Mapping * mapping )
+{
+    _copyConstructStruct( pDest, pSource, pTypeDescr, acquire, mapping );
+}
+
+void destructStruct(
+    void * pValue,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+{
+    _destructStruct( pValue, pTypeDescr, release );
+}
+
+bool equalStruct(
+    void * pDest, void *pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+{
+    return _equalStruct( pDest, pSource, pTypeDescr, queryInterface, release );
+}
+
+bool assignStruct(
+    void * pDest, void * pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_QueryInterfaceFunc queryInterface, uno_AcquireFunc acquire, uno_ReleaseFunc release )
+{
+    return _assignStruct( pDest, pSource, pTypeDescr, queryInterface, acquire, release );
+}
+
+
+uno_Sequence * copyConstructSequence(
+    uno_Sequence * pSource,
+    typelib_TypeDescriptionReference * pElementType,
+    uno_AcquireFunc acquire, uno_Mapping * mapping )
+{
+    return icopyConstructSequence( pSource, pElementType, acquire, mapping );
+}
+
+
+void destructSequence(
+    uno_Sequence * pSequence,
+    typelib_TypeDescriptionReference * pType,
+    typelib_TypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+{
+    idestructSequence( pSequence, pType, pTypeDescr, release );
+}
+
+
+bool equalSequence(
+    uno_Sequence * pDest, uno_Sequence * pSource,
+    typelib_TypeDescriptionReference * pElementType,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+{
+    return _equalSequence( pDest, pSource, pElementType, queryInterface, release );
+}
+
+}
+
+extern "C"
+{
+
+void SAL_CALL uno_type_constructData(
+    void * pMem, typelib_TypeDescriptionReference * pType )
+    SAL_THROW_EXTERN_C()
+{
+    _defaultConstructData( pMem, pType, nullptr );
+}
+
+void SAL_CALL uno_constructData(
+    void * pMem, typelib_TypeDescription * pTypeDescr )
+    SAL_THROW_EXTERN_C()
+{
+    _defaultConstructData( pMem, pTypeDescr->pWeakRef, pTypeDescr );
+}
+
+void SAL_CALL uno_type_destructData(
+    void * pValue, typelib_TypeDescriptionReference * pType,
+    uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    _destructData( pValue, pType, nullptr, release );
+}
+
+void SAL_CALL uno_destructData(
+    void * pValue,
+    typelib_TypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    _destructData( pValue, pTypeDescr->pWeakRef, pTypeDescr, release );
+}
+
+void SAL_CALL uno_type_copyData(
+    void * pDest, void * pSource,
+    typelib_TypeDescriptionReference * pType,
+    uno_AcquireFunc acquire )
+    SAL_THROW_EXTERN_C()
+{
+    _copyConstructData( pDest, pSource, pType, nullptr, acquire, nullptr );
+}
+
+void SAL_CALL uno_copyData(
+    void * pDest, void * pSource,
+    typelib_TypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire )
+    SAL_THROW_EXTERN_C()
+{
+    _copyConstructData( pDest, pSource, pTypeDescr->pWeakRef, pTypeDescr, acquire, nullptr );
+}
+
+void SAL_CALL uno_type_copyAndConvertData(
+    void * pDest, void * pSource,
+    typelib_TypeDescriptionReference * pType,
+    uno_Mapping * mapping )
+    SAL_THROW_EXTERN_C()
+{
+    _copyConstructData( pDest, pSource, pType, nullptr, nullptr, mapping );
+}
+
+void SAL_CALL uno_copyAndConvertData(
+    void * pDest, void * pSource,
+    typelib_TypeDescription * pTypeDescr,
+    uno_Mapping * mapping )
+    SAL_THROW_EXTERN_C()
+{
+    _copyConstructData( pDest, pSource, pTypeDescr->pWeakRef, pTypeDescr, nullptr, mapping );
+}
+
+sal_Bool SAL_CALL uno_type_equalData(
+    void * pVal1, typelib_TypeDescriptionReference * pVal1Type,
+    void * pVal2, typelib_TypeDescriptionReference * pVal2Type,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    return _equalData(
+        pVal1, pVal1Type, nullptr,
+        pVal2, pVal2Type,
+        queryInterface, release );
+}
+
+sal_Bool SAL_CALL uno_equalData(
+    void * pVal1, typelib_TypeDescription * pVal1TD,
+    void * pVal2, typelib_TypeDescription * pVal2TD,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    return _equalData(
+        pVal1, pVal1TD->pWeakRef, pVal1TD,
+        pVal2, pVal2TD->pWeakRef,
+        queryInterface, release );
+}
+
+sal_Bool SAL_CALL uno_type_assignData(
+    void * pDest, typelib_TypeDescriptionReference * pDestType,
+    void * pSource, typelib_TypeDescriptionReference * pSourceType,
+    uno_QueryInterfaceFunc queryInterface, uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    return _assignData(
+        pDest, pDestType, nullptr,
+        pSource, pSourceType, nullptr,
+        queryInterface, acquire, release );
+}
+
+sal_Bool SAL_CALL uno_assignData(
+    void * pDest, typelib_TypeDescription * pDestTD,
+    void * pSource, typelib_TypeDescription * pSourceTD,
+    uno_QueryInterfaceFunc queryInterface, uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    return _assignData(
+        pDest, pDestTD->pWeakRef, pDestTD,
+        pSource, pSourceTD->pWeakRef, pSourceTD,
+        queryInterface, acquire, release );
+}
+
+sal_Bool SAL_CALL uno_type_isAssignableFromData(
+    typelib_TypeDescriptionReference * pAssignable,
+    void * pFrom, typelib_TypeDescriptionReference * pFromType,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    if (::typelib_typedescriptionreference_isAssignableFrom( pAssignable, pFromType ))
+        return true;
+    if (typelib_TypeClass_INTERFACE != pFromType->eTypeClass ||
+        typelib_TypeClass_INTERFACE != pAssignable->eTypeClass)
+    {
+        return false;
+    }
+
+    // query
+    if (nullptr == pFrom)
+        return false;
+    void * pInterface = *static_cast<void **>(pFrom);
+    if (nullptr == pInterface)
+        return false;
+
+    if (nullptr == queryInterface)
+        queryInterface = binuno_queryInterface;
+    void * p = (*queryInterface)( pInterface, pAssignable );
+    _release( p, release );
+    return (nullptr != p);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/destr.hxx b/cppu/source/uno/destr.hxx
new file mode 100644
index 000000000..13e4ca044
--- /dev/null
+++ b/cppu/source/uno/destr.hxx
@@ -0,0 +1,352 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <sal/config.h>
+#include <osl/diagnose.h>
+
+#include <cassert>
+#include <cstdlib>
+
+#include "prim.hxx"
+
+namespace cppu
+{
+
+
+//#### destruction #################################################################################
+
+
+void destructStruct(
+    void * pValue,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_ReleaseFunc release );
+
+inline void _destructStruct(
+    void * pValue,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+{
+    if (pTypeDescr->pBaseTypeDescription)
+    {
+        destructStruct( pValue, pTypeDescr->pBaseTypeDescription, release );
+    }
+
+    typelib_TypeDescriptionReference ** ppTypeRefs = pTypeDescr->ppTypeRefs;
+    sal_Int32 * pMemberOffsets = pTypeDescr->pMemberOffsets;
+    sal_Int32 nDescr = pTypeDescr->nMembers;
+    while (nDescr--)
+    {
+        ::uno_type_destructData(
+            static_cast<char *>(pValue) + pMemberOffsets[nDescr],
+            ppTypeRefs[nDescr], release );
+    }
+}
+
+
+void destructSequence(
+    uno_Sequence * pSequence,
+    typelib_TypeDescriptionReference * pType,
+    typelib_TypeDescription * pTypeDescr,
+    uno_ReleaseFunc release );
+
+
+inline void _destructAny(
+    uno_Any * pAny,
+    uno_ReleaseFunc release )
+{
+    typelib_TypeDescriptionReference * pType = pAny->pType;
+
+    switch (pType->eTypeClass)
+    {
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        if (sizeof(void *) < sizeof(sal_Int64))
+        {
+            std::free( pAny->pData );
+        }
+        break;
+    case typelib_TypeClass_FLOAT:
+        if (sizeof(void *) < sizeof(float))
+        {
+            std::free( pAny->pData );
+        }
+        break;
+    case typelib_TypeClass_DOUBLE:
+        if (sizeof(void *) < sizeof(double))
+        {
+            std::free( pAny->pData );
+        }
+        break;
+    case typelib_TypeClass_STRING:
+        ::rtl_uString_release( static_cast<rtl_uString *>(pAny->pReserved) );
+        break;
+    case typelib_TypeClass_TYPE:
+        ::typelib_typedescriptionreference_release(
+            static_cast<typelib_TypeDescriptionReference *>(pAny->pReserved) );
+        break;
+    case typelib_TypeClass_ANY:
+        OSL_FAIL( "### unexpected nested any!" );
+        ::uno_any_destruct( static_cast<uno_Any *>(pAny->pData), release );
+        std::free( pAny->pData );
+        break;
+    case typelib_TypeClass_TYPEDEF:
+        OSL_FAIL( "### unexpected typedef!" );
+        break;
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+    {
+        typelib_TypeDescription * pTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pTypeDescr, pType );
+        _destructStruct( pAny->pData, reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr), release );
+        TYPELIB_DANGER_RELEASE( pTypeDescr );
+        std::free( pAny->pData );
+        break;
+    }
+    case typelib_TypeClass_SEQUENCE:
+    {
+        destructSequence(
+            static_cast<uno_Sequence *>(pAny->pReserved), pType, nullptr, release );
+        break;
+    }
+    case typelib_TypeClass_INTERFACE:
+        _release( pAny->pReserved, release );
+        break;
+    default:
+        break;
+    }
+#if OSL_DEBUG_LEVEL > 0
+    pAny->pData = reinterpret_cast<void *>(uintptr_t(0xdeadbeef));
+#endif
+
+    ::typelib_typedescriptionreference_release( pType );
+}
+
+inline sal_Int32 idestructElements(
+    void * pElements, typelib_TypeDescriptionReference * pElementType,
+    sal_Int32 nStartIndex, sal_Int32 nStopIndex,
+    uno_ReleaseFunc release )
+{
+    switch (pElementType->eTypeClass)
+    {
+    case typelib_TypeClass_CHAR:
+        return sal_Int32(sizeof(sal_Unicode));
+    case typelib_TypeClass_BOOLEAN:
+        return sal_Int32(sizeof(sal_Bool));
+    case typelib_TypeClass_BYTE:
+        return sal_Int32(sizeof(sal_Int8));
+    case typelib_TypeClass_SHORT:
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        return sal_Int32(sizeof(sal_Int16));
+    case typelib_TypeClass_LONG:
+    case typelib_TypeClass_UNSIGNED_LONG:
+        return sal_Int32(sizeof(sal_Int32));
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        return sal_Int32(sizeof(sal_Int64));
+    case typelib_TypeClass_FLOAT:
+        return sal_Int32(sizeof(float));
+    case typelib_TypeClass_DOUBLE:
+        return sal_Int32(sizeof(double));
+
+    case typelib_TypeClass_STRING:
+    {
+        rtl_uString ** pDest = static_cast<rtl_uString **>(pElements);
+        for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+        {
+            ::rtl_uString_release( pDest[nPos] );
+        }
+        return sal_Int32(sizeof(rtl_uString *));
+    }
+    case typelib_TypeClass_TYPE:
+    {
+        typelib_TypeDescriptionReference ** pDest = static_cast<typelib_TypeDescriptionReference **>(pElements);
+        for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+        {
+            ::typelib_typedescriptionreference_release( pDest[nPos] );
+        }
+        return sal_Int32(sizeof(typelib_TypeDescriptionReference *));
+    }
+    case typelib_TypeClass_ANY:
+    {
+        uno_Any * pDest = static_cast<uno_Any *>(pElements);
+        for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+        {
+            _destructAny( &pDest[nPos], release );
+        }
+        return sal_Int32(sizeof(uno_Any));
+    }
+    case typelib_TypeClass_ENUM:
+        return sal_Int32(sizeof(sal_Int32));
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+    {
+        typelib_TypeDescription * pElementTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+        sal_Int32 nElementSize = pElementTypeDescr->nSize;
+        for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+        {
+            _destructStruct(
+                static_cast<char *>(pElements) + (nElementSize * nPos),
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pElementTypeDescr),
+                release );
+        }
+        sal_Int32 nSize = pElementTypeDescr->nSize;
+        TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        return nSize;
+    }
+    case typelib_TypeClass_SEQUENCE:
+    {
+        typelib_TypeDescription * pElementTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+        uno_Sequence ** pDest = static_cast<uno_Sequence **>(pElements);
+        for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+        {
+            destructSequence(
+                pDest[nPos],
+                pElementTypeDescr->pWeakRef, pElementTypeDescr,
+                release );
+        }
+        TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        return sal_Int32(sizeof(uno_Sequence *));
+    }
+    case typelib_TypeClass_INTERFACE:
+    {
+        if (release)
+        {
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                void * p = static_cast<void **>(pElements)[nPos];
+                if (p)
+                {
+                    (*release)( p );
+                }
+            }
+        }
+        else
+        {
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                uno_Interface * p = static_cast<uno_Interface **>(pElements)[nPos];
+                if (p)
+                {
+                    (*p->release)( p );
+                }
+            }
+        }
+        return sal_Int32(sizeof(void *));
+    }
+    default:
+        OSL_ASSERT(false);
+        return 0;
+    }
+}
+
+inline void idestroySequence(
+    uno_Sequence * pSeq,
+    typelib_TypeDescriptionReference * pType,
+    typelib_TypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+{
+    assert(pSeq != nullptr);
+    assert(pSeq->nRefCount == 0);
+    if (pSeq->nElements > 0)
+    {
+        if (pTypeDescr)
+        {
+            idestructElements(
+                pSeq->elements,
+                reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType, 0,
+                pSeq->nElements, release );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            idestructElements(
+                pSeq->elements,
+                reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType, 0,
+                pSeq->nElements, release );
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+    }
+    std::free( pSeq );
+}
+
+inline void idestructSequence(
+    uno_Sequence * pSeq,
+    typelib_TypeDescriptionReference * pType,
+    typelib_TypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+{
+    if (osl_atomic_decrement( &pSeq->nRefCount ) == 0)
+    {
+        idestroySequence(pSeq, pType, pTypeDescr, release);
+    }
+}
+
+inline void _destructData(
+    void * pValue,
+    typelib_TypeDescriptionReference * pType,
+    typelib_TypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+{
+    switch (pType->eTypeClass)
+    {
+    case typelib_TypeClass_STRING:
+        ::rtl_uString_release( *static_cast<rtl_uString **>(pValue) );
+        break;
+    case typelib_TypeClass_TYPE:
+        ::typelib_typedescriptionreference_release( *static_cast<typelib_TypeDescriptionReference **>(pValue) );
+        break;
+    case typelib_TypeClass_ANY:
+        _destructAny( static_cast<uno_Any *>(pValue), release );
+        break;
+    case typelib_TypeClass_TYPEDEF:
+        OSL_FAIL( "### unexpected typedef!" );
+        break;
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+        if (pTypeDescr)
+        {
+            _destructStruct( pValue, reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr), release );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            _destructStruct( pValue, reinterpret_cast<typelib_CompoundTypeDescription *>(pTypeDescr), release );
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+        break;
+    case typelib_TypeClass_SEQUENCE:
+    {
+        idestructSequence(
+            *static_cast<uno_Sequence **>(pValue), pType, pTypeDescr, release );
+        break;
+    }
+    case typelib_TypeClass_INTERFACE:
+        _release( *static_cast<void **>(pValue), release );
+        break;
+    default:
+        break;
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/eq.hxx b/cppu/source/uno/eq.hxx
new file mode 100644
index 000000000..60a372886
--- /dev/null
+++ b/cppu/source/uno/eq.hxx
@@ -0,0 +1,635 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <cmath>
+#include <string.h>
+
+#include <o3tl/intcmp.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ustring.hxx>
+
+#include "prim.hxx"
+
+
+namespace cppu
+{
+
+
+//#### equality ####################################################################################
+
+
+inline bool _equalObject(
+    void * pI1, void * pI2,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+{
+    if (pI1 == pI2)
+        return true;
+    if ((nullptr == pI1) || (nullptr == pI2))
+        return false;
+    bool bRet = false;
+
+    typelib_TypeDescriptionReference * type_XInterface =
+        * typelib_static_type_getByTypeClass( typelib_TypeClass_INTERFACE );
+    if (nullptr == queryInterface)
+        queryInterface = binuno_queryInterface;
+    pI1 = (*queryInterface)( pI1, type_XInterface );
+    if (nullptr != pI1)
+    {
+        pI2 = (*queryInterface)( pI2, type_XInterface );
+        if (nullptr != pI2)
+        {
+            bRet = (pI1 == pI2);
+            _release( pI2, release );
+        }
+        _release( pI1, release );
+    }
+    return bRet;
+}
+
+
+bool equalStruct(
+    void * pDest, void *pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release );
+
+inline bool _equalStruct(
+    void * pDest, void *pSource,
+    typelib_CompoundTypeDescription * pTypeDescr,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+{
+    if (pTypeDescr->pBaseTypeDescription &&
+        !equalStruct( pDest, pSource, pTypeDescr->pBaseTypeDescription, queryInterface, release ))
+    {
+        return false;
+    }
+
+    typelib_TypeDescriptionReference ** ppTypeRefs = pTypeDescr->ppTypeRefs;
+    sal_Int32 * pMemberOffsets = pTypeDescr->pMemberOffsets;
+    sal_Int32 nDescr = pTypeDescr->nMembers;
+
+    while (nDescr--)
+    {
+        sal_Int32 nOffset = pMemberOffsets[nDescr];
+        if (! ::uno_type_equalData( static_cast<char *>(pDest) + nOffset,
+                                    ppTypeRefs[nDescr],
+                                    static_cast<char *>(pSource) + nOffset,
+                                    ppTypeRefs[nDescr],
+                                    queryInterface, release ))
+        {
+            return false;
+        }
+    }
+    return true;
+}
+
+bool equalSequence(
+    uno_Sequence * pDest, uno_Sequence * pSource,
+    typelib_TypeDescriptionReference * pElementType,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release );
+
+inline bool _equalSequence(
+    uno_Sequence * pDest, uno_Sequence * pSource,
+    typelib_TypeDescriptionReference * pElementType,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+{
+    if (pDest == pSource)
+        return true;
+    sal_Int32 nElements = pDest->nElements;
+    if (nElements != pSource->nElements)
+        return false;
+    if (! nElements)
+        return true;
+
+    void * pDestElements = pDest->elements;
+    void * pSourceElements = pSource->elements;
+
+    switch (pElementType->eTypeClass)
+    {
+    case typelib_TypeClass_CHAR:
+        return (0 == memcmp( pDestElements, pSourceElements, sizeof(sal_Unicode) * nElements ));
+    case typelib_TypeClass_BOOLEAN:
+    {
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if (bool(static_cast<sal_Bool *>(pDestElements)[nPos]) !=
+                bool(static_cast<sal_Bool *>(pSourceElements)[nPos]))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    case typelib_TypeClass_BYTE:
+        return (0 == memcmp( pDestElements, pSourceElements, sizeof(sal_Int8) * nElements ));
+    case typelib_TypeClass_SHORT:
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        return (0 == memcmp( pDestElements, pSourceElements, sizeof(sal_Int16) * nElements ));
+    case typelib_TypeClass_LONG:
+    case typelib_TypeClass_UNSIGNED_LONG:
+        return (0 == memcmp( pDestElements, pSourceElements, sizeof(sal_Int32) * nElements ));
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        return (0 == memcmp( pDestElements, pSourceElements, sizeof(sal_Int64) * nElements ));
+    case typelib_TypeClass_FLOAT:
+    {
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if (static_cast<float *>(pDestElements)[nPos] != static_cast<float *>(pSourceElements)[nPos])
+                return false;
+        }
+        return true;
+    }
+    case typelib_TypeClass_DOUBLE:
+    {
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if (static_cast<double *>(pDestElements)[nPos] != static_cast<double *>(pSourceElements)[nPos])
+                return false;
+        }
+        return true;
+    }
+    case typelib_TypeClass_STRING:
+    {
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if ( static_cast<OUString *>(pDestElements)[nPos] != static_cast<const OUString *>(pSourceElements)[nPos] )
+                return false;
+        }
+        return true;
+    }
+    case typelib_TypeClass_TYPE:
+    {
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if (! _type_equals( static_cast<typelib_TypeDescriptionReference **>(pDestElements)[nPos],
+                                static_cast<typelib_TypeDescriptionReference **>(pSourceElements)[nPos] ))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    case typelib_TypeClass_ANY:
+    {
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            uno_Any * pDest2 = static_cast<uno_Any *>(pDestElements) + nPos;
+            uno_Any * pSource2 = static_cast<uno_Any *>(pSourceElements) + nPos;
+            if (! ::uno_type_equalData( pDest2->pData, pDest2->pType,
+                                        pSource2->pData, pSource2->pType,
+                                        queryInterface, release ))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    case typelib_TypeClass_ENUM:
+        return (0 == memcmp( pDestElements, pSourceElements, sizeof(sal_Int32) * nElements ));
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+    {
+        typelib_TypeDescription * pElementTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+        sal_Int32 nElementSize = pElementTypeDescr->nSize;
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if (! _equalStruct( static_cast<char *>(pDestElements) + (nPos * nElementSize),
+                                static_cast<char *>(pSourceElements) + (nPos * nElementSize),
+                                reinterpret_cast<typelib_CompoundTypeDescription *>(pElementTypeDescr),
+                                queryInterface, release ))
+            {
+                TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+                return false;
+            }
+        }
+        TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        return true;
+    }
+    case typelib_TypeClass_SEQUENCE: // sequence of sequence
+    {
+        typelib_TypeDescription * pElementTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+        typelib_TypeDescriptionReference * pSeqElementType =
+            reinterpret_cast<typelib_IndirectTypeDescription *>(pElementTypeDescr)->pType;
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if (! equalSequence( static_cast<uno_Sequence **>(pDestElements)[nPos],
+                                 static_cast<uno_Sequence **>(pSourceElements)[nPos],
+                                 pSeqElementType, queryInterface, release ))
+            {
+                TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+                return false;
+            }
+        }
+        TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        return true;
+    }
+    case typelib_TypeClass_INTERFACE:
+    {
+        for ( sal_Int32 nPos = nElements; nPos--; )
+        {
+            if (! _equalObject( static_cast<void **>(pDestElements)[nPos], static_cast<void **>(pSourceElements)[nPos],
+                                queryInterface, release ))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    default:
+        OSL_ASSERT(false);
+        return false;
+    }
+}
+
+inline bool _equalData(
+    void * pDest,
+    typelib_TypeDescriptionReference * pDestType, typelib_TypeDescription * pDestTypeDescr,
+    void * pSource,
+    typelib_TypeDescriptionReference * pSourceType,
+    uno_QueryInterfaceFunc queryInterface, uno_ReleaseFunc release )
+{
+    typelib_TypeClass eSourceTypeClass, eDestTypeClass;
+    while (typelib_TypeClass_ANY == (eDestTypeClass = pDestType->eTypeClass))
+    {
+        pDestTypeDescr = nullptr;
+        pDestType = static_cast<uno_Any *>(pDest)->pType;
+        pDest = static_cast<uno_Any *>(pDest)->pData;
+    }
+    while (typelib_TypeClass_ANY == (eSourceTypeClass = pSourceType->eTypeClass))
+    {
+        pSourceType = static_cast<uno_Any *>(pSource)->pType;
+        pSource = static_cast<uno_Any *>(pSource)->pData;
+    }
+
+    switch (eDestTypeClass)
+    {
+    case typelib_TypeClass_VOID:
+        return eSourceTypeClass == typelib_TypeClass_VOID;
+    case typelib_TypeClass_CHAR:
+        return eSourceTypeClass == typelib_TypeClass_CHAR
+            && *static_cast<sal_Unicode *>(pDest) == *static_cast<sal_Unicode *>(pSource);
+    case typelib_TypeClass_BOOLEAN:
+        return eSourceTypeClass == typelib_TypeClass_BOOLEAN
+            && (bool(*static_cast<sal_Bool *>(pDest))
+                == bool(*static_cast<sal_Bool *>(pSource)));
+    case typelib_TypeClass_BYTE:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int8 *>(pDest), *static_cast<sal_Int8 *>(pSource));
+        case typelib_TypeClass_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int8 *>(pDest), *static_cast<sal_Int16 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int8 *>(pDest), *static_cast<sal_uInt16 *>(pSource));
+        case typelib_TypeClass_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int8 *>(pDest), *static_cast<sal_Int32 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int8 *>(pDest), *static_cast<sal_uInt32 *>(pSource));
+        case typelib_TypeClass_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int8 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int8 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (static_cast<float>(*static_cast<sal_Int8 *>(pDest)) == *static_cast<float *>(pSource));
+        case typelib_TypeClass_DOUBLE:
+            return (static_cast<double>(*static_cast<sal_Int8 *>(pDest)) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_SHORT:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int16 *>(pDest), *static_cast<sal_Int8 *>(pSource));
+        case typelib_TypeClass_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int16 *>(pDest), *static_cast<sal_Int16 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int16 *>(pDest), *static_cast<sal_uInt16 *>(pSource));
+        case typelib_TypeClass_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int16 *>(pDest), *static_cast<sal_Int32 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int16 *>(pDest), *static_cast<sal_uInt32 *>(pSource));
+        case typelib_TypeClass_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int16 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int16 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (static_cast<float>(*static_cast<sal_Int16 *>(pDest)) == *static_cast<float *>(pSource));
+        case typelib_TypeClass_DOUBLE:
+            return (static_cast<double>(*static_cast<sal_Int16 *>(pDest)) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt16 *>(pDest), *static_cast<sal_Int8 *>(pSource));
+        case typelib_TypeClass_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt16 *>(pDest), *static_cast<sal_Int16 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt16 *>(pDest), *static_cast<sal_uInt16 *>(pSource));
+        case typelib_TypeClass_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt16 *>(pDest), *static_cast<sal_Int32 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt16 *>(pDest), *static_cast<sal_uInt32 *>(pSource));
+        case typelib_TypeClass_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt16 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt16 *>(pDest), *static_cast<sal_uInt64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (static_cast<float>(*static_cast<sal_uInt16 *>(pDest)) == *static_cast<float *>(pSource));
+        case typelib_TypeClass_DOUBLE:
+            return (static_cast<double>(*static_cast<sal_uInt16 *>(pDest)) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_LONG:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int32 *>(pDest), *static_cast<sal_Int8 *>(pSource));
+        case typelib_TypeClass_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int32 *>(pDest), *static_cast<sal_Int16 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int32 *>(pDest), *static_cast<sal_uInt16 *>(pSource));
+        case typelib_TypeClass_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int32 *>(pDest), *static_cast<sal_Int32 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int32 *>(pDest), *static_cast<sal_uInt32 *>(pSource));
+        case typelib_TypeClass_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int32 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int32 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (static_cast<float>(*static_cast<sal_Int32 *>(pDest)) == *static_cast<float *>(pSource));
+        case typelib_TypeClass_DOUBLE:
+            return (static_cast<double>(*static_cast<sal_Int32 *>(pDest)) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_UNSIGNED_LONG:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt32 *>(pDest), *static_cast<sal_Int8 *>(pSource));
+        case typelib_TypeClass_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt32 *>(pDest), *static_cast<sal_Int16 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt32 *>(pDest), *static_cast<sal_uInt16 *>(pSource));
+        case typelib_TypeClass_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt32 *>(pDest), *static_cast<sal_Int32 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt32 *>(pDest), *static_cast<sal_uInt32 *>(pSource));
+        case typelib_TypeClass_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt32 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt32 *>(pDest), *static_cast<sal_uInt64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (static_cast<float>(*static_cast<sal_uInt32 *>(pDest)) == *static_cast<float *>(pSource));
+        case typelib_TypeClass_DOUBLE:
+            return (static_cast<double>(*static_cast<sal_uInt32 *>(pDest)) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_HYPER:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int64 *>(pDest), *static_cast<sal_Int8 *>(pSource));
+        case typelib_TypeClass_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int64 *>(pDest), *static_cast<sal_Int16 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int64 *>(pDest), *static_cast<sal_uInt16 *>(pSource));
+        case typelib_TypeClass_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int64 *>(pDest), *static_cast<sal_Int32 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int64 *>(pDest), *static_cast<sal_uInt32 *>(pSource));
+        case typelib_TypeClass_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int64 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_Int64 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (static_cast<float>(*static_cast<sal_Int64 *>(pDest)) == *static_cast<float *>(pSource));
+        case typelib_TypeClass_DOUBLE:
+            return (static_cast<double>(*static_cast<sal_Int64 *>(pDest)) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt64 *>(pDest), *static_cast<sal_Int8 *>(pSource));
+        case typelib_TypeClass_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt64 *>(pDest), *static_cast<sal_Int16 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt64 *>(pDest), *static_cast<sal_uInt16 *>(pSource));
+        case typelib_TypeClass_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt64 *>(pDest), *static_cast<sal_Int32 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt64 *>(pDest), *static_cast<sal_uInt32 *>(pSource));
+        case typelib_TypeClass_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt64 *>(pDest), *static_cast<sal_Int64 *>(pSource));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            return o3tl::cmp_equal(
+                *static_cast<sal_uInt64 *>(pDest), *static_cast<sal_uInt64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            if (::floor( *static_cast<float *>(pSource) ) != *static_cast<float *>(pSource) || *static_cast<float *>(pSource) < 0)
+                return false;
+            return (*static_cast<sal_uInt64 *>(pDest) == static_cast<sal_uInt64>(*static_cast<float *>(pSource)));
+        case typelib_TypeClass_DOUBLE:
+            if (::floor( *static_cast<double *>(pSource) ) != *static_cast<double *>(pSource) || *static_cast<double *>(pSource) < 0)
+                return false;
+            return (*static_cast<sal_uInt64 *>(pDest) == static_cast<sal_uInt64>(*static_cast<double *>(pSource)));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_FLOAT:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return (*static_cast<float *>(pDest) == static_cast<float>(*static_cast<sal_Int8 *>(pSource)));
+        case typelib_TypeClass_SHORT:
+            return (*static_cast<float *>(pDest) == static_cast<float>(*static_cast<sal_Int16 *>(pSource)));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return (*static_cast<float *>(pDest) == static_cast<float>(*static_cast<sal_uInt16 *>(pSource)));
+        case typelib_TypeClass_LONG:
+            return (*static_cast<float *>(pDest) == static_cast<float>(*static_cast<sal_Int32 *>(pSource)));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return (*static_cast<float *>(pDest) == static_cast<float>(*static_cast<sal_uInt32 *>(pSource)));
+        case typelib_TypeClass_HYPER:
+            return (*static_cast<float *>(pDest) == static_cast<float>(*static_cast<sal_Int64 *>(pSource)));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            if (::floor( *static_cast<float *>(pDest) ) != *static_cast<float *>(pDest) || *static_cast<float *>(pDest) < 0)
+                return false;
+            return (static_cast<sal_uInt64>(*static_cast<float *>(pDest)) == *static_cast<sal_uInt64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (*static_cast<float *>(pDest) == *static_cast<float *>(pSource));
+        case typelib_TypeClass_DOUBLE:
+            return (static_cast<double>(*static_cast<float *>(pDest)) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_DOUBLE:
+        switch (eSourceTypeClass)
+        {
+        case typelib_TypeClass_BYTE:
+            return (*static_cast<double *>(pDest) == static_cast<double>(*static_cast<sal_Int8 *>(pSource)));
+        case typelib_TypeClass_SHORT:
+            return (*static_cast<double *>(pDest) == static_cast<double>(*static_cast<sal_Int16 *>(pSource)));
+        case typelib_TypeClass_UNSIGNED_SHORT:
+            return (*static_cast<double *>(pDest) == static_cast<double>(*static_cast<sal_uInt16 *>(pSource)));
+        case typelib_TypeClass_LONG:
+            return (*static_cast<double *>(pDest) == static_cast<double>(*static_cast<sal_Int32 *>(pSource)));
+        case typelib_TypeClass_UNSIGNED_LONG:
+            return (*static_cast<double *>(pDest) == static_cast<double>(*static_cast<sal_uInt32 *>(pSource)));
+        case typelib_TypeClass_HYPER:
+            return (*static_cast<double *>(pDest) == static_cast<double>(*static_cast<sal_Int64 *>(pSource)));
+        case typelib_TypeClass_UNSIGNED_HYPER:
+            if (::floor( *static_cast<double *>(pDest) ) != *static_cast<double *>(pDest) || *static_cast<double *>(pDest) < 0)
+                return false;
+            return (static_cast<sal_uInt64>(*static_cast<double *>(pDest)) == *static_cast<sal_uInt64 *>(pSource));
+        case typelib_TypeClass_FLOAT:
+            return (*static_cast<double *>(pDest) == static_cast<double>(*static_cast<float *>(pSource)));
+        case typelib_TypeClass_DOUBLE:
+            return (*static_cast<double *>(pDest) == *static_cast<double *>(pSource));
+        default:
+            return false;
+        }
+    case typelib_TypeClass_STRING:
+        return eSourceTypeClass == typelib_TypeClass_STRING
+            && *static_cast<OUString *>(pDest) ==
+                *static_cast<OUString const *>(pSource);
+    case typelib_TypeClass_TYPE:
+        return eSourceTypeClass == typelib_TypeClass_TYPE
+            && _type_equals(
+                *static_cast<typelib_TypeDescriptionReference **>(pDest),
+                *static_cast<typelib_TypeDescriptionReference **>(pSource) );
+    case typelib_TypeClass_ENUM:
+        return (_type_equals( pDestType, pSourceType ) &&
+                *static_cast<sal_Int32 *>(pDest) == *static_cast<sal_Int32 *>(pSource));
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+        if (! _type_equals( pDestType, pSourceType ))
+            return false;
+        if (pDestTypeDescr)
+        {
+            return _equalStruct(
+                pDest, pSource,
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pDestTypeDescr),
+                queryInterface, release );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pDestTypeDescr, pDestType );
+            bool bRet = _equalStruct(
+                pDest, pSource,
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pDestTypeDescr),
+                queryInterface, release );
+            TYPELIB_DANGER_RELEASE( pDestTypeDescr );
+            return bRet;
+        }
+    case typelib_TypeClass_SEQUENCE:
+        if (_type_equals( pDestType, pSourceType ))
+        {
+            if (pDestTypeDescr)
+            {
+                return _equalSequence(
+                    *static_cast<uno_Sequence **>(pDest), *static_cast<uno_Sequence **>(pSource),
+                    reinterpret_cast<typelib_IndirectTypeDescription *>(pDestTypeDescr)->pType,
+                    queryInterface, release );
+            }
+            else
+            {
+                TYPELIB_DANGER_GET( &pDestTypeDescr, pDestType );
+                bool bRet = _equalSequence(
+                    *static_cast<uno_Sequence **>(pDest), *static_cast<uno_Sequence **>(pSource),
+                    reinterpret_cast<typelib_IndirectTypeDescription *>(pDestTypeDescr)->pType,
+                    queryInterface, release );
+                TYPELIB_DANGER_RELEASE( pDestTypeDescr );
+                return bRet;
+            }
+        }
+        return false;
+    case typelib_TypeClass_INTERFACE:
+        if (typelib_TypeClass_INTERFACE == eSourceTypeClass)
+            return _equalObject( *static_cast<void **>(pDest), *static_cast<void **>(pSource), queryInterface, release );
+        break;
+    default:
+        OSL_ASSERT(false);
+        break;
+    }
+    return false;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/lbenv.cxx b/cppu/source/uno/lbenv.cxx
new file mode 100644
index 000000000..dd29951a6
--- /dev/null
+++ b/cppu/source/uno/lbenv.cxx
@@ -0,0 +1,1147 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifdef DISABLE_DYNLOADING
+#include <config_java.h>
+#endif
+
+#include <cppu/EnvDcp.hxx>
+
+#include <sal/log.hxx>
+#include <osl/diagnose.h>
+#include <osl/interlck.h>
+#include <osl/mutex.hxx>
+#include <osl/module.hxx>
+#include <osl/process.h>
+#include <rtl/process.h>
+#include <rtl/string.hxx>
+#include <rtl/ustring.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <typelib/typedescription.h>
+#include <uno/dispatcher.h>
+#include <uno/environment.h>
+#include <uno/lbnames.h>
+#include "prim.hxx"
+#include "loadmodule.hxx"
+
+#include <string_view>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+#include <stdio.h>
+
+
+namespace
+{
+
+
+bool td_equals( typelib_InterfaceTypeDescription const * pTD1,
+                       typelib_InterfaceTypeDescription const * pTD2 )
+{
+    return (pTD1 == pTD2 ||
+            (pTD1->aBase.pTypeName->length == pTD2->aBase.pTypeName->length &&
+             ::rtl_ustr_compare(
+                 pTD1->aBase.pTypeName->buffer,
+                 pTD2->aBase.pTypeName->buffer ) == 0));
+}
+
+struct uno_DefaultEnvironment;
+
+
+struct InterfaceEntry
+{
+    sal_Int32 refCount;
+    void * pInterface;
+    uno_freeProxyFunc fpFreeProxy;
+    typelib_InterfaceTypeDescription * pTypeDescr;
+};
+
+struct ObjectEntry
+{
+    OUString oid;
+    std::vector< InterfaceEntry > aInterfaces;
+    sal_Int32 nRef;
+    bool mixedObject;
+
+    explicit ObjectEntry( OUString aOId_ );
+
+    void append(
+        uno_DefaultEnvironment * pEnv,
+        void * pInterface, typelib_InterfaceTypeDescription * pTypeDescr,
+        uno_freeProxyFunc fpFreeProxy );
+    InterfaceEntry * find(
+        typelib_InterfaceTypeDescription * pTypeDescr );
+    sal_Int32 find( void const * iface_ptr, std::size_t pos ) const;
+};
+
+
+struct FctPtrHash
+{
+    std::size_t operator () ( const void * pKey ) const
+        { return reinterpret_cast< std::size_t>( pKey ); }
+};
+
+
+// mapping from environment name to environment
+typedef std::unordered_map<
+    OUString, uno_Environment * > OUString2EnvironmentMap;
+
+// mapping from ptr to object entry
+typedef std::unordered_map<
+    void *, ObjectEntry *, FctPtrHash > Ptr2ObjectMap;
+// mapping from oid to object entry
+typedef std::unordered_map<
+    OUString, ObjectEntry * > OId2ObjectMap;
+
+struct EnvironmentsData
+{
+    ::osl::Mutex mutex;
+    OUString2EnvironmentMap aName2EnvMap;
+
+    EnvironmentsData() : isDisposing(false) {}
+    ~EnvironmentsData();
+
+    void getEnvironment(
+        uno_Environment ** ppEnv, std::u16string_view rEnvDcp, void * pContext );
+    void registerEnvironment( uno_Environment ** ppEnv );
+    void getRegisteredEnvironments(
+        uno_Environment *** pppEnvs, sal_Int32 * pnLen,
+        uno_memAlloc memAlloc, std::u16string_view rEnvDcp );
+
+    bool isDisposing;
+};
+
+EnvironmentsData& theEnvironmentsData()
+{
+    static EnvironmentsData SINGLETON;
+    return SINGLETON;
+}
+
+struct uno_DefaultEnvironment : public uno_ExtEnvironment
+{
+    sal_Int32 nRef;
+    sal_Int32 nWeakRef;
+
+    ::osl::Mutex mutex;
+    Ptr2ObjectMap aPtr2ObjectMap;
+    OId2ObjectMap aOId2ObjectMap;
+
+    uno_DefaultEnvironment(
+        const OUString & rEnvDcp_, void * pContext_ );
+    ~uno_DefaultEnvironment();
+};
+
+
+ObjectEntry::ObjectEntry( OUString aOId_ )
+    : oid(std::move( aOId_ )),
+      nRef( 0 ),
+      mixedObject( false )
+{
+    aInterfaces.reserve( 2 );
+}
+
+
+void ObjectEntry::append(
+    uno_DefaultEnvironment * pEnv,
+    void * pInterface, typelib_InterfaceTypeDescription * pTypeDescr,
+    uno_freeProxyFunc fpFreeProxy )
+{
+    InterfaceEntry aNewEntry;
+    if (! fpFreeProxy)
+        (*pEnv->acquireInterface)( pEnv, pInterface );
+    aNewEntry.refCount = 1;
+    aNewEntry.pInterface = pInterface;
+    aNewEntry.fpFreeProxy = fpFreeProxy;
+    typelib_typedescription_acquire( &pTypeDescr->aBase );
+    aNewEntry.pTypeDescr = pTypeDescr;
+
+    std::pair< Ptr2ObjectMap::iterator, bool > i(
+        pEnv->aPtr2ObjectMap.emplace( pInterface, this ) );
+    SAL_WARN_IF(
+        !i.second && (find(pInterface, 0) == -1 || i.first->second != this),
+        "cppu",
+        "map already contains " << i.first->second << " != " << this << " for "
+            << pInterface);
+    aInterfaces.push_back( aNewEntry );
+}
+
+
+InterfaceEntry * ObjectEntry::find(
+    typelib_InterfaceTypeDescription * pTypeDescr_ )
+{
+    OSL_ASSERT( ! aInterfaces.empty() );
+    if (aInterfaces.empty())
+        return nullptr;
+
+    // shortcut common case:
+    OUString const & type_name =
+        OUString::unacquired( &pTypeDescr_->aBase.pTypeName );
+    if ( type_name == "com.sun.star.uno.XInterface" )
+    {
+        return aInterfaces.data();
+    }
+
+    std::size_t nSize = aInterfaces.size();
+    for ( std::size_t nPos = 0; nPos < nSize; ++nPos )
+    {
+        typelib_InterfaceTypeDescription * pITD =
+            aInterfaces[ nPos ].pTypeDescr;
+        while (pITD)
+        {
+            if (td_equals( pITD, pTypeDescr_ ))
+                return &aInterfaces[ nPos ];
+            pITD = pITD->pBaseTypeDescription;
+        }
+    }
+    return nullptr;
+}
+
+
+sal_Int32 ObjectEntry::find(
+    void const * iface_ptr, std::size_t pos ) const
+{
+    std::size_t size = aInterfaces.size();
+    for ( ; pos < size; ++pos )
+    {
+        if (aInterfaces[ pos ].pInterface == iface_ptr)
+            return pos;
+    }
+    return -1;
+}
+
+extern "C"
+{
+
+
+static void defenv_registerInterface(
+    uno_ExtEnvironment * pEnv, void ** ppInterface,
+    rtl_uString * pOId, typelib_InterfaceTypeDescription * pTypeDescr )
+{
+    OSL_ENSURE( pEnv && ppInterface && pOId && pTypeDescr, "### null ptr!" );
+    OUString const & rOId = OUString::unacquired( &pOId );
+
+    uno_DefaultEnvironment * that =
+        static_cast< uno_DefaultEnvironment * >( pEnv );
+    ::osl::ClearableMutexGuard guard( that->mutex );
+
+    // try to insert dummy 0:
+    std::pair<OId2ObjectMap::iterator, bool> const insertion(
+        that->aOId2ObjectMap.emplace(  rOId, nullptr ) );
+    if (insertion.second)
+    {
+        ObjectEntry * pOEntry = new ObjectEntry( rOId );
+        insertion.first->second = pOEntry;
+        ++pOEntry->nRef; // another register call on object
+        pOEntry->append( that, *ppInterface, pTypeDescr, nullptr );
+    }
+    else // object entry exists
+    {
+        ObjectEntry * pOEntry = insertion.first->second;
+        ++pOEntry->nRef; // another register call on object
+        InterfaceEntry * pIEntry = pOEntry->find( pTypeDescr );
+
+        if (pIEntry) // type entry exists
+        {
+            ++pIEntry->refCount;
+            if (pIEntry->pInterface != *ppInterface)
+            {
+                void * pInterface = pIEntry->pInterface;
+                (*pEnv->acquireInterface)( pEnv, pInterface );
+                guard.clear();
+                (*pEnv->releaseInterface)( pEnv, *ppInterface );
+                *ppInterface = pInterface;
+            }
+        }
+        else
+        {
+            pOEntry->append( that, *ppInterface, pTypeDescr, nullptr );
+        }
+    }
+}
+
+
+static void defenv_registerProxyInterface(
+    uno_ExtEnvironment * pEnv, void ** ppInterface, uno_freeProxyFunc freeProxy,
+    rtl_uString * pOId, typelib_InterfaceTypeDescription * pTypeDescr )
+{
+    OSL_ENSURE( pEnv && ppInterface && pOId && pTypeDescr && freeProxy,
+                "### null ptr!" );
+    OUString const & rOId = OUString::unacquired( &pOId );
+
+    uno_DefaultEnvironment * that =
+        static_cast< uno_DefaultEnvironment * >( pEnv );
+    ::osl::ClearableMutexGuard guard( that->mutex );
+
+    // try to insert dummy 0:
+    std::pair<OId2ObjectMap::iterator, bool> const insertion(
+        that->aOId2ObjectMap.emplace(  rOId, nullptr ) );
+    if (insertion.second)
+    {
+        ObjectEntry * pOEntry = new ObjectEntry( rOId );
+        insertion.first->second = pOEntry;
+        ++pOEntry->nRef; // another register call on object
+        pOEntry->append( that, *ppInterface, pTypeDescr, freeProxy );
+    }
+    else // object entry exists
+    {
+        ObjectEntry * pOEntry = insertion.first->second;
+
+        // first registration was an original, then registerProxyInterface():
+        pOEntry->mixedObject |=
+            (!pOEntry->aInterfaces.empty() &&
+             pOEntry->aInterfaces[ 0 ].fpFreeProxy == nullptr);
+
+        ++pOEntry->nRef; // another register call on object
+        InterfaceEntry * pIEntry = pOEntry->find( pTypeDescr );
+
+        if (pIEntry) // type entry exists
+        {
+            if (pIEntry->pInterface == *ppInterface)
+            {
+                ++pIEntry->refCount;
+            }
+            else
+            {
+                void * pInterface = pIEntry->pInterface;
+                (*pEnv->acquireInterface)( pEnv, pInterface );
+                --pOEntry->nRef; // manual revoke of proxy to be freed
+                guard.clear();
+                (*freeProxy)( pEnv, *ppInterface );
+                *ppInterface = pInterface;
+            }
+        }
+        else
+        {
+            pOEntry->append( that, *ppInterface, pTypeDescr, freeProxy );
+        }
+    }
+}
+
+
+static void s_stub_defenv_revokeInterface(va_list * pParam)
+{
+    uno_ExtEnvironment * pEnv       = va_arg(*pParam, uno_ExtEnvironment *);
+    void               * pInterface = va_arg(*pParam, void *);
+
+    OSL_ENSURE( pEnv && pInterface, "### null ptr!" );
+    uno_DefaultEnvironment * that =
+        static_cast< uno_DefaultEnvironment * >( pEnv );
+    ::osl::ClearableMutexGuard guard( that->mutex );
+
+    Ptr2ObjectMap::const_iterator const iFind(
+        that->aPtr2ObjectMap.find( pInterface ) );
+    OSL_ASSERT( iFind != that->aPtr2ObjectMap.end() );
+    ObjectEntry * pOEntry = iFind->second;
+    if (! --pOEntry->nRef)
+    {
+        // cleanup maps
+        that->aOId2ObjectMap.erase( pOEntry->oid );
+        sal_Int32 nPos;
+        for ( nPos = pOEntry->aInterfaces.size(); nPos--; )
+        {
+            that->aPtr2ObjectMap.erase( pOEntry->aInterfaces[nPos].pInterface );
+        }
+
+        // the last proxy interface of the environment might kill this
+        // environment, because of releasing its language binding!!!
+        guard.clear();
+
+        // release interfaces
+        for ( nPos = pOEntry->aInterfaces.size(); nPos--; )
+        {
+            InterfaceEntry const & rEntry = pOEntry->aInterfaces[nPos];
+            typelib_typedescription_release( &rEntry.pTypeDescr->aBase );
+            if (rEntry.fpFreeProxy) // is proxy or used interface?
+            {
+                (*rEntry.fpFreeProxy)( pEnv, rEntry.pInterface );
+            }
+            else
+            {
+                (*pEnv->releaseInterface)( pEnv, rEntry.pInterface );
+            }
+        }
+
+        delete pOEntry;
+    }
+    else if (pOEntry->mixedObject)
+    {
+        OSL_ASSERT( !pOEntry->aInterfaces.empty() &&
+                    pOEntry->aInterfaces[ 0 ].fpFreeProxy == nullptr );
+
+        sal_Int32 index = pOEntry->find( pInterface, 1 );
+        OSL_ASSERT( index > 0 );
+        if (index > 0)
+        {
+            InterfaceEntry & entry = pOEntry->aInterfaces[ index ];
+            OSL_ASSERT( entry.pInterface == pInterface );
+            if (entry.fpFreeProxy != nullptr)
+            {
+                --entry.refCount;
+                if (entry.refCount == 0)
+                {
+                    uno_freeProxyFunc fpFreeProxy = entry.fpFreeProxy;
+                    typelib_TypeDescription * pTypeDescr =
+                        reinterpret_cast< typelib_TypeDescription * >(
+                            entry.pTypeDescr );
+
+                    pOEntry->aInterfaces.erase(
+                        pOEntry->aInterfaces.begin() + index );
+                    if (pOEntry->find( pInterface, index ) < 0)
+                    {
+                        // proxy ptr not registered for another interface:
+                        // remove from ptr map
+                        std::size_t erased =
+                              that->aPtr2ObjectMap.erase( pInterface );
+                        OSL_ASSERT( erased == 1 );
+                    }
+
+                    guard.clear();
+
+                    typelib_typedescription_release( pTypeDescr );
+                    (*fpFreeProxy)( pEnv, pInterface );
+                }
+            }
+        }
+    }
+}
+
+static void defenv_revokeInterface(uno_ExtEnvironment * pEnv, void * pInterface)
+{
+    uno_Environment_invoke(&pEnv->aBase, s_stub_defenv_revokeInterface, pEnv, pInterface);
+}
+
+
+static void defenv_getObjectIdentifier(
+    uno_ExtEnvironment * pEnv, rtl_uString ** ppOId, void * pInterface )
+{
+    OSL_ENSURE( pEnv && ppOId && pInterface, "### null ptr!" );
+    if (*ppOId)
+    {
+        ::rtl_uString_release( *ppOId );
+        *ppOId = nullptr;
+    }
+
+    uno_DefaultEnvironment * that =
+        static_cast< uno_DefaultEnvironment * >( pEnv );
+    ::osl::ClearableMutexGuard guard( that->mutex );
+
+    Ptr2ObjectMap::const_iterator const iFind(
+        that->aPtr2ObjectMap.find( pInterface ) );
+    if (iFind == that->aPtr2ObjectMap.end())
+    {
+        guard.clear();
+        (*pEnv->computeObjectIdentifier)( pEnv, ppOId, pInterface );
+    }
+    else
+    {
+        rtl_uString * hstr = iFind->second->oid.pData;
+        rtl_uString_acquire( hstr );
+        *ppOId = hstr;
+    }
+}
+
+
+static void defenv_getRegisteredInterface(
+    uno_ExtEnvironment * pEnv, void ** ppInterface,
+    rtl_uString * pOId, typelib_InterfaceTypeDescription * pTypeDescr )
+{
+    OSL_ENSURE( pEnv && ppInterface && pOId && pTypeDescr, "### null ptr!" );
+    if (*ppInterface)
+    {
+        (*pEnv->releaseInterface)( pEnv, *ppInterface );
+        *ppInterface = nullptr;
+    }
+
+    OUString const & rOId = OUString::unacquired( &pOId );
+    uno_DefaultEnvironment * that =
+        static_cast< uno_DefaultEnvironment * >( pEnv );
+    ::osl::MutexGuard guard( that->mutex );
+
+    OId2ObjectMap::const_iterator const iFind
+        ( that->aOId2ObjectMap.find( rOId ) );
+    if (iFind != that->aOId2ObjectMap.end())
+    {
+        InterfaceEntry const * pIEntry = iFind->second->find( pTypeDescr );
+        if (pIEntry)
+        {
+            (*pEnv->acquireInterface)( pEnv, pIEntry->pInterface );
+            *ppInterface = pIEntry->pInterface;
+        }
+    }
+}
+
+
+static void defenv_getRegisteredInterfaces(
+    uno_ExtEnvironment * pEnv, void *** pppInterfaces, sal_Int32 * pnLen,
+    uno_memAlloc memAlloc )
+{
+    assert(pEnv && pppInterfaces && pnLen && memAlloc && "### null ptr!");
+    uno_DefaultEnvironment * that =
+        static_cast< uno_DefaultEnvironment * >( pEnv );
+    ::osl::MutexGuard guard( that->mutex );
+
+    sal_Int32 nLen = that->aPtr2ObjectMap.size();
+    sal_Int32 nPos = 0;
+    void ** ppInterfaces = static_cast<void **>((*memAlloc)( nLen * sizeof (void *) ));
+
+    for (const auto& rEntry : that->aPtr2ObjectMap)
+    {
+        ppInterfaces[nPos] = rEntry.first;
+        (*pEnv->acquireInterface)( pEnv, ppInterfaces[nPos] );
+        nPos++;
+    }
+
+    *pppInterfaces = ppInterfaces;
+    *pnLen = nLen;
+}
+
+
+static void defenv_acquire( uno_Environment * pEnv )
+{
+    uno_DefaultEnvironment * that = reinterpret_cast<uno_DefaultEnvironment *>(pEnv);
+    osl_atomic_increment( &that->nWeakRef );
+    osl_atomic_increment( &that->nRef );
+}
+
+
+static void defenv_release( uno_Environment * pEnv )
+{
+    uno_DefaultEnvironment * that = reinterpret_cast<uno_DefaultEnvironment *>(pEnv);
+    if (! osl_atomic_decrement( &that->nRef ))
+    {
+        // invoke dispose callback
+        if (pEnv->environmentDisposing)
+        {
+            (*pEnv->environmentDisposing)( pEnv );
+        }
+
+        OSL_ENSURE( that->aOId2ObjectMap.empty(), "### object entries left!" );
+    }
+    // free memory if no weak refs left
+    if (! osl_atomic_decrement( &that->nWeakRef ))
+    {
+        delete that;
+    }
+}
+
+
+static void defenv_acquireWeak( uno_Environment * pEnv )
+{
+    uno_DefaultEnvironment * that = reinterpret_cast<uno_DefaultEnvironment *>(pEnv);
+    osl_atomic_increment( &that->nWeakRef );
+}
+
+
+static void defenv_releaseWeak( uno_Environment * pEnv )
+{
+    uno_DefaultEnvironment * that = reinterpret_cast<uno_DefaultEnvironment *>(pEnv);
+    if (! osl_atomic_decrement( &that->nWeakRef ))
+    {
+        delete that;
+    }
+}
+
+
+static void defenv_harden(
+    uno_Environment ** ppHardEnv, uno_Environment * pEnv )
+{
+    if (*ppHardEnv)
+    {
+        (*(*ppHardEnv)->release)( *ppHardEnv );
+        *ppHardEnv = nullptr;
+    }
+
+    EnvironmentsData & rData = theEnvironmentsData();
+
+    if (rData.isDisposing)
+        return;
+
+    uno_DefaultEnvironment * that = reinterpret_cast<uno_DefaultEnvironment *>(pEnv);
+    {
+    ::osl::MutexGuard guard( rData.mutex );
+    if (1 == osl_atomic_increment( &that->nRef )) // is dead
+    {
+        that->nRef = 0;
+        return;
+    }
+    }
+    osl_atomic_increment( &that->nWeakRef );
+    *ppHardEnv = pEnv;
+}
+
+
+static void defenv_dispose( SAL_UNUSED_PARAMETER uno_Environment * )
+{
+}
+}
+
+
+uno_DefaultEnvironment::uno_DefaultEnvironment(
+    const OUString & rEnvDcp_, void * pContext_ )
+    : nRef( 0 ),
+      nWeakRef( 0 )
+{
+    uno_Environment * that = reinterpret_cast< uno_Environment * >(this);
+    that->pReserved = nullptr;
+    // functions
+    that->acquire = defenv_acquire;
+    that->release = defenv_release;
+    that->acquireWeak = defenv_acquireWeak;
+    that->releaseWeak = defenv_releaseWeak;
+    that->harden = defenv_harden;
+    that->dispose = defenv_dispose;
+    that->pExtEnv = this;
+    // identifier
+    ::rtl_uString_acquire( rEnvDcp_.pData );
+    that->pTypeName = rEnvDcp_.pData;
+    that->pContext = pContext_;
+
+    // will be late initialized
+    that->environmentDisposing = nullptr;
+
+    uno_ExtEnvironment::registerInterface = defenv_registerInterface;
+    uno_ExtEnvironment::registerProxyInterface = defenv_registerProxyInterface;
+    uno_ExtEnvironment::revokeInterface = defenv_revokeInterface;
+    uno_ExtEnvironment::getObjectIdentifier = defenv_getObjectIdentifier;
+    uno_ExtEnvironment::getRegisteredInterface = defenv_getRegisteredInterface;
+    uno_ExtEnvironment::getRegisteredInterfaces =
+        defenv_getRegisteredInterfaces;
+
+}
+
+
+uno_DefaultEnvironment::~uno_DefaultEnvironment()
+{
+    ::rtl_uString_release( aBase.pTypeName );
+}
+
+
+void writeLine(
+    void * stream, const char * pLine, const char * pFilter )
+{
+    if (pFilter && *pFilter)
+    {
+        // lookup pFilter in pLine
+        while (*pLine)
+        {
+            if (*pLine == *pFilter)
+            {
+                sal_Int32 nPos = 1;
+                while (pLine[nPos] && pFilter[nPos] == pLine[nPos])
+                {
+                    ++nPos;
+                }
+                if (! pFilter[nPos])
+                {
+                    if (stream)
+                    {
+                        fprintf( static_cast<FILE *>(stream), "%s\n", pLine );
+                    }
+                    else
+                    {
+                        SAL_WARN("cppu", pLine );
+                    }
+                }
+            }
+            ++pLine;
+        }
+    }
+    else
+    {
+        if (stream)
+        {
+            fprintf( static_cast<FILE *>(stream), "%s\n", pLine );
+        }
+        else
+        {
+            fprintf( stderr, "%s\n", pLine );
+        }
+    }
+}
+
+
+void writeLine(
+    void * stream, std::u16string_view rLine, const char * pFilter )
+{
+    OString aLine( OUStringToOString(
+                              rLine, RTL_TEXTENCODING_ASCII_US ) );
+    writeLine( stream, aLine.getStr(), pFilter );
+}
+
+}
+
+extern "C" void SAL_CALL uno_dumpEnvironment(
+    void * stream, uno_Environment * pEnv, const char * pFilter )
+    SAL_THROW_EXTERN_C()
+{
+    OSL_ENSURE( pEnv, "### null ptr!" );
+    OUStringBuffer buf;
+
+    if (! pEnv->pExtEnv)
+    {
+        writeLine( stream, "###################################"
+                   "###########################################", pFilter );
+        buf.append( "environment: " );
+        buf.append( pEnv->pTypeName );
+        writeLine( stream, buf.makeStringAndClear(), pFilter );
+        writeLine( stream, "NO INTERFACE INFORMATION AVAILABLE!", pFilter );
+        return;
+    }
+
+    writeLine( stream, "########################################"
+               "######################################", pFilter );
+    buf.append( "environment dump: " );
+    buf.append( pEnv->pTypeName );
+    writeLine( stream, buf.makeStringAndClear(), pFilter );
+
+    uno_DefaultEnvironment * that =
+        reinterpret_cast< uno_DefaultEnvironment * >(pEnv);
+    ::osl::MutexGuard guard( that->mutex );
+
+    Ptr2ObjectMap ptr2obj( that->aPtr2ObjectMap );
+    for (const auto& rEntry : that->aOId2ObjectMap)
+    {
+        ObjectEntry * pOEntry = rEntry.second;
+
+        buf.append( "+ " );
+        if (pOEntry->mixedObject)
+            buf.append( "mixed " );
+        buf.append( "object entry: nRef=" );
+        buf.append( pOEntry->nRef );
+        buf.append( "; oid=\"" );
+        buf.append( pOEntry->oid );
+        buf.append( '\"' );
+        writeLine( stream, buf.makeStringAndClear(), pFilter );
+
+        for ( std::size_t nPos = 0;
+              nPos < pOEntry->aInterfaces.size(); ++nPos )
+        {
+            const InterfaceEntry & rIEntry = pOEntry->aInterfaces[nPos];
+
+            buf.append( "  - " );
+            buf.append( rIEntry.pTypeDescr->aBase.pTypeName );
+            if (rIEntry.fpFreeProxy)
+            {
+                buf.append( "; proxy free=0x" );
+                buf.append(
+                    reinterpret_cast< sal_IntPtr >(rIEntry.fpFreeProxy), 16 );
+            }
+            else
+            {
+                buf.append( "; original" );
+            }
+            buf.append( "; ptr=0x" );
+            buf.append(
+                reinterpret_cast< sal_IntPtr >(rIEntry.pInterface), 16 );
+
+            if (pOEntry->find( rIEntry.pInterface, nPos + 1 ) < 0)
+            {
+                std::size_t erased = ptr2obj.erase( rIEntry.pInterface );
+                if (erased != 1)
+                {
+                    buf.append( " (ptr not found in map!)" );
+                }
+            }
+            writeLine( stream, buf.makeStringAndClear(), pFilter );
+        }
+    }
+    if (! ptr2obj.empty())
+        writeLine( stream, "ptr map inconsistency!!!", pFilter );
+    writeLine( stream, "#####################################"
+               "#########################################", pFilter );
+}
+
+
+extern "C" void SAL_CALL uno_dumpEnvironmentByName(
+    void * stream, rtl_uString * pEnvDcp, const char * pFilter )
+    SAL_THROW_EXTERN_C()
+{
+    uno_Environment * pEnv = nullptr;
+    uno_getEnvironment( &pEnv, pEnvDcp, nullptr );
+    if (pEnv)
+    {
+        ::uno_dumpEnvironment( stream, pEnv, pFilter );
+        (*pEnv->release)( pEnv );
+    }
+    else
+    {
+        writeLine(
+            stream,
+            OUStringConcatenation("environment \"" + OUString::unacquired(&pEnvDcp) + "\" does not exist!"),
+            pFilter );
+    }
+}
+
+namespace
+{
+
+const OUString & unoenv_getStaticOIdPart()
+{
+    static auto const theStaticOIdPart = [] {
+            OUStringBuffer aRet( 64 );
+            aRet.append( "];" );
+            // pid
+            oslProcessInfo info;
+            info.Size = sizeof(oslProcessInfo);
+            if (::osl_getProcessInfo( nullptr, osl_Process_IDENTIFIER, &info ) ==
+                osl_Process_E_None)
+            {
+                aRet.append( static_cast<sal_Int64>(info.Ident), 16 );
+            }
+            else
+            {
+                aRet.append( "unknown process id" );
+            }
+            // good guid
+            sal_uInt8 ar[16];
+            ::rtl_getGlobalProcessId( ar );
+            aRet.append( ';' );
+            for (unsigned char i : ar)
+                aRet.append( static_cast<sal_Int32>(i), 16 );
+
+            return aRet.makeStringAndClear();
+        }();
+    return theStaticOIdPart;
+}
+
+}
+
+extern "C"
+{
+
+
+static void unoenv_computeObjectIdentifier(
+    uno_ExtEnvironment * pEnv, rtl_uString ** ppOId, void * pInterface )
+{
+    assert(pEnv && ppOId && pInterface && "### null ptr!");
+    if (*ppOId)
+    {
+        ::rtl_uString_release( *ppOId );
+        *ppOId = nullptr;
+    }
+
+    uno_Interface * pUnoI = static_cast<uno_Interface *>(
+        ::cppu::binuno_queryInterface(
+            pInterface, *typelib_static_type_getByTypeClass(
+                typelib_TypeClass_INTERFACE ) ));
+    if (nullptr == pUnoI)
+        return;
+
+    (*pUnoI->release)( pUnoI );
+    OUString aStr(
+        // interface
+        OUString::number( reinterpret_cast< sal_Int64 >(pUnoI), 16 ) + ";"
+        // environment[context]
+        + OUString::unacquired(&pEnv->aBase.pTypeName) + "["
+        + OUString::number( reinterpret_cast< sal_Int64 >(
+                    reinterpret_cast<
+                    uno_Environment * >(pEnv)->pContext ), 16 )
+        // process;good guid
+        + unoenv_getStaticOIdPart() );
+    *ppOId = aStr.pData;
+    ::rtl_uString_acquire( *ppOId );
+}
+
+
+static void unoenv_acquireInterface(
+    SAL_UNUSED_PARAMETER uno_ExtEnvironment *, void * pUnoI_ )
+{
+    uno_Interface * pUnoI = static_cast< uno_Interface * >(pUnoI_);
+    (*pUnoI->acquire)( pUnoI );
+}
+
+
+static void unoenv_releaseInterface(
+    SAL_UNUSED_PARAMETER uno_ExtEnvironment *, void * pUnoI_ )
+{
+    uno_Interface * pUnoI = static_cast< uno_Interface * >(pUnoI_);
+    (*pUnoI->release)( pUnoI );
+}
+}
+
+namespace {
+
+EnvironmentsData::~EnvironmentsData()
+{
+    ::osl::MutexGuard guard( mutex );
+    isDisposing = true;
+
+    for ( const auto& rEntry : aName2EnvMap )
+    {
+        uno_Environment * pWeak = rEntry.second;
+        uno_Environment * pHard = nullptr;
+        (*pWeak->harden)( &pHard, pWeak );
+        (*pWeak->releaseWeak)( pWeak );
+
+        if (pHard)
+        {
+            (*pHard->dispose)( pHard ); // send explicit dispose
+            (*pHard->release)( pHard );
+        }
+    }
+}
+
+
+void EnvironmentsData::getEnvironment(
+    uno_Environment ** ppEnv, std::u16string_view rEnvDcp, void * pContext )
+{
+    if (*ppEnv)
+    {
+        (*(*ppEnv)->release)( *ppEnv );
+        *ppEnv = nullptr;
+    }
+
+    OUString aKey = OUString::number( reinterpret_cast< sal_IntPtr >(pContext) ) + rEnvDcp;
+
+    // try to find registered mapping
+    OUString2EnvironmentMap::const_iterator const iFind(
+        aName2EnvMap.find( aKey ) );
+    if (iFind != aName2EnvMap.end())
+    {
+        uno_Environment * pWeak = iFind->second;
+        (*pWeak->harden)( ppEnv, pWeak );
+    }
+}
+
+
+void EnvironmentsData::registerEnvironment( uno_Environment ** ppEnv )
+{
+    OSL_ENSURE( ppEnv, "### null ptr!" );
+    uno_Environment * pEnv =  *ppEnv;
+
+    OUString aKey =
+        OUString::number( reinterpret_cast< sal_IntPtr >(pEnv->pContext) ) +
+        OUString::unacquired(&pEnv->pTypeName);
+
+    // try to find registered environment
+    OUString2EnvironmentMap::const_iterator const iFind(
+        aName2EnvMap.find( aKey ) );
+    if (iFind == aName2EnvMap.end())
+    {
+        (*pEnv->acquireWeak)( pEnv );
+        std::pair< OUString2EnvironmentMap::iterator, bool > insertion (
+            aName2EnvMap.emplace( aKey, pEnv ) );
+        SAL_WARN_IF( !insertion.second, "cppu", "key " << aKey << " already in env map" );
+    }
+    else
+    {
+        uno_Environment * pHard = nullptr;
+        uno_Environment * pWeak = iFind->second;
+        (*pWeak->harden)( &pHard, pWeak );
+        if (pHard)
+        {
+            (*pEnv->release)( pEnv );
+            *ppEnv = pHard;
+        }
+        else // registered one is dead
+        {
+            (*pWeak->releaseWeak)( pWeak );
+            (*pEnv->acquireWeak)( pEnv );
+            aName2EnvMap[ aKey ] = pEnv;
+        }
+    }
+}
+
+
+void EnvironmentsData::getRegisteredEnvironments(
+    uno_Environment *** pppEnvs, sal_Int32 * pnLen, uno_memAlloc memAlloc,
+    std::u16string_view rEnvDcp )
+{
+    assert(pppEnvs && pnLen && memAlloc && "### null ptr!");
+
+    // max size
+    std::vector<uno_Environment*> aFounds(aName2EnvMap.size());
+    sal_Int32 nSize = 0;
+
+    // find matching environment
+    for ( const auto& rEntry : aName2EnvMap )
+    {
+        uno_Environment * pWeak = rEntry.second;
+        if (rEnvDcp.empty() ||
+            rEnvDcp == OUString::unacquired(&pWeak->pTypeName) )
+        {
+            aFounds[nSize] = nullptr;
+            (*pWeak->harden)( &aFounds[nSize], pWeak );
+            if (aFounds[nSize])
+                ++nSize;
+        }
+    }
+
+    *pnLen = nSize;
+    if (nSize)
+    {
+        *pppEnvs = static_cast<uno_Environment **>((*memAlloc)(
+            sizeof (uno_Environment *) * nSize ));
+        OSL_ASSERT( *pppEnvs );
+        while (nSize--)
+        {
+            (*pppEnvs)[nSize] = aFounds[nSize];
+        }
+    }
+    else
+    {
+        *pppEnvs = nullptr;
+    }
+}
+
+bool loadEnv(OUString const  & cLibStem,
+                    uno_Environment * pEnv)
+{
+#ifdef DISABLE_DYNLOADING
+    uno_initEnvironmentFunc fpInit;
+
+    if ( cLibStem == CPPU_CURRENT_LANGUAGE_BINDING_NAME "_uno" )
+        fpInit = CPPU_ENV_uno_initEnvironment;
+#if HAVE_FEATURE_JAVA
+    else if ( cLibStem == "java_uno" )
+        fpInit = java_uno_initEnvironment;
+#endif
+    else
+    {
+        SAL_INFO("cppu", ": Unhandled env: " << cLibStem);
+        return false;
+    }
+#else
+    // late init with some code from matching uno language binding
+    // will be unloaded by environment
+    osl::Module aMod;
+    try {
+        bool bMod = cppu::detail::loadModule(aMod, cLibStem);
+        if (!bMod)
+            return false;
+    }
+    catch(...) {
+        // Catch everything and convert to return false
+        return false;
+    }
+
+
+    uno_initEnvironmentFunc fpInit = reinterpret_cast<uno_initEnvironmentFunc>(aMod.getSymbol(UNO_INIT_ENVIRONMENT));
+
+    if (!fpInit)
+        return false;
+
+    aMod.release();
+#endif
+
+    (*fpInit)( pEnv ); // init of environment
+    return true;
+}
+
+}
+
+extern "C"
+{
+
+
+static uno_Environment * initDefaultEnvironment(
+    const OUString & rEnvDcp, void * pContext )
+{
+    // coverity[leaked_storage : FALSE] - lifetime is controlled by acquire()/release() calls
+    uno_Environment * pEnv = &(new uno_DefaultEnvironment( rEnvDcp, pContext ))->aBase;
+    (*pEnv->acquire)( pEnv );
+
+    OUString envTypeName = cppu::EnvDcp::getTypeName(rEnvDcp);
+
+    // create default environment
+    if ( envTypeName == UNO_LB_UNO )
+    {
+        uno_DefaultEnvironment * that = reinterpret_cast<uno_DefaultEnvironment *>(pEnv);
+        that->computeObjectIdentifier = unoenv_computeObjectIdentifier;
+        that->acquireInterface = unoenv_acquireInterface;
+        that->releaseInterface = unoenv_releaseInterface;
+
+        OUString envPurpose = cppu::EnvDcp::getPurpose(rEnvDcp);
+        if (!envPurpose.isEmpty())
+        {
+            OUString libStem(
+                OUString::Concat(envPurpose.subView(envPurpose.lastIndexOf(':') + 1)) + "_uno_uno");
+            if(!loadEnv(libStem, pEnv))
+            {
+                pEnv->release(pEnv);
+                return nullptr;
+            }
+        }
+    }
+    else
+    {
+        // late init with some code from matching uno language binding
+        OUString aStr( envTypeName + "_uno" );
+
+        if (!loadEnv(aStr, pEnv))
+        {
+            pEnv->release(pEnv);
+            return nullptr;
+        }
+    }
+
+    return pEnv;
+}
+
+
+void SAL_CALL uno_createEnvironment(
+    uno_Environment ** ppEnv, rtl_uString * pEnvDcp, void * pContext )
+    SAL_THROW_EXTERN_C()
+{
+    assert(ppEnv && "### null ptr!");
+    if (*ppEnv)
+        (*(*ppEnv)->release)( *ppEnv );
+
+    OUString const & rEnvDcp = OUString::unacquired( &pEnvDcp );
+    *ppEnv = initDefaultEnvironment( rEnvDcp, pContext );
+}
+
+void SAL_CALL uno_getEnvironment(
+    uno_Environment ** ppEnv, rtl_uString * pEnvDcp, void * pContext )
+    SAL_THROW_EXTERN_C()
+{
+    assert(ppEnv && "### null ptr!");
+    OUString const & rEnvDcp = OUString::unacquired( &pEnvDcp );
+
+    EnvironmentsData & rData = theEnvironmentsData();
+
+    ::osl::MutexGuard guard( rData.mutex );
+    rData.getEnvironment( ppEnv, rEnvDcp, pContext );
+    if (! *ppEnv)
+    {
+        *ppEnv = initDefaultEnvironment( rEnvDcp, pContext );
+        if (*ppEnv)
+        {
+            // register new environment:
+            rData.registerEnvironment( ppEnv );
+        }
+    }
+}
+
+void SAL_CALL uno_getRegisteredEnvironments(
+    uno_Environment *** pppEnvs, sal_Int32 * pnLen, uno_memAlloc memAlloc,
+    rtl_uString * pEnvDcp )
+    SAL_THROW_EXTERN_C()
+{
+    EnvironmentsData & rData = theEnvironmentsData();
+
+    ::osl::MutexGuard guard( rData.mutex );
+    rData.getRegisteredEnvironments(
+        pppEnvs, pnLen, memAlloc,
+        (pEnvDcp ? OUString(pEnvDcp) : OUString()) );
+}
+
+} // extern "C"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/lbmap.cxx b/cppu/source/uno/lbmap.cxx
new file mode 100644
index 000000000..b056193de
--- /dev/null
+++ b/cppu/source/uno/lbmap.cxx
@@ -0,0 +1,754 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifdef DISABLE_DYNLOADING
+#include <config_java.h>
+#endif
+
+#include "IdentityMapping.hxx"
+
+#include <cassert>
+#include <mutex>
+#include <set>
+#include <unordered_map>
+#include <utility>
+
+#include <rtl/ustring.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <osl/module.hxx>
+#include <osl/diagnose.h>
+#include <osl/mutex.hxx>
+#include <osl/interlck.h>
+#include <sal/log.hxx>
+
+#include <uno/dispatcher.h>
+#include <uno/mapping.h>
+#include <uno/lbnames.h>
+#include <uno/environment.hxx>
+
+#include <typelib/typedescription.h>
+
+#include <cppu/EnvDcp.hxx>
+#include "cascade_mapping.hxx"
+#include "loadmodule.hxx"
+
+using namespace osl;
+using namespace com::sun::star::uno;
+
+namespace cppu
+{
+
+namespace {
+
+class Mapping
+{
+    uno_Mapping * _pMapping;
+
+public:
+    inline explicit Mapping( uno_Mapping * pMapping = nullptr );
+    inline Mapping( const Mapping & rMapping );
+    Mapping(Mapping && other) noexcept : _pMapping(other._pMapping)
+    { other._pMapping = nullptr; }
+    inline ~Mapping();
+    inline Mapping & operator = ( uno_Mapping * pMapping );
+    Mapping & operator = ( const Mapping & rMapping )
+        { return operator = ( rMapping._pMapping ); }
+    Mapping & operator =(Mapping && other) noexcept {
+        if (_pMapping != nullptr) {
+            (*_pMapping->release)(_pMapping);
+        }
+        _pMapping = other._pMapping;
+        other._pMapping = nullptr;
+        return *this;
+    }
+    uno_Mapping * get() const
+        { return _pMapping; }
+    bool is() const
+        { return (_pMapping != nullptr); }
+};
+
+}
+
+inline Mapping::Mapping( uno_Mapping * pMapping )
+    : _pMapping( pMapping )
+{
+    if (_pMapping)
+        (*_pMapping->acquire)( _pMapping );
+}
+
+inline Mapping::Mapping( const Mapping & rMapping )
+    : _pMapping( rMapping._pMapping )
+{
+    if (_pMapping)
+        (*_pMapping->acquire)( _pMapping );
+}
+
+inline Mapping::~Mapping()
+{
+    if (_pMapping)
+        (*_pMapping->release)( _pMapping );
+}
+
+inline Mapping & Mapping::operator = ( uno_Mapping * pMapping )
+{
+    if (pMapping)
+        (*pMapping->acquire)( pMapping );
+    if (_pMapping)
+        (*_pMapping->release)( _pMapping );
+    _pMapping = pMapping;
+    return *this;
+}
+
+namespace {
+
+struct MappingEntry
+{
+    sal_Int32           nRef;
+    uno_Mapping *       pMapping;
+    uno_freeMappingFunc freeMapping;
+    OUString            aMappingName;
+
+    MappingEntry(
+        uno_Mapping * pMapping_, uno_freeMappingFunc freeMapping_,
+        OUString aMappingName_ )
+        : nRef( 1 )
+        , pMapping( pMapping_ )
+        , freeMapping( freeMapping_ )
+        , aMappingName(std::move( aMappingName_ ))
+        {}
+};
+
+struct FctPtrHash
+{
+    size_t operator()( uno_Mapping * pKey ) const
+        { return reinterpret_cast<size_t>(pKey); }
+};
+
+}
+
+typedef std::unordered_map<
+    OUString, MappingEntry * > t_OUString2Entry;
+typedef std::unordered_map<
+    uno_Mapping *, MappingEntry *, FctPtrHash > t_Mapping2Entry;
+
+namespace {
+
+struct MappingsData
+{
+    Mutex               aMappingsMutex;
+    t_OUString2Entry    aName2Entry;
+    t_Mapping2Entry     aMapping2Entry;
+
+    std::mutex          aCallbacksMutex;
+    std::set< uno_getMappingFunc >
+                        aCallbacks;
+
+    std::mutex          aNegativeLibsMutex;
+    std::set<OUString>       aNegativeLibs;
+};
+
+}
+
+static MappingsData & getMappingsData()
+{
+    //TODO  This memory is leaked; see #i63473# for when this should be
+    // changed again:
+    static MappingsData * s_p(new MappingsData);
+
+    return *s_p;
+}
+
+namespace {
+
+/**
+ * This class mediates two different mapping via uno, e.g. form any language to uno,
+ * then from uno to any other language.
+ */
+struct uno_Mediate_Mapping : public uno_Mapping
+{
+    sal_Int32   nRef;
+
+    Environment aFrom;
+    Environment aTo;
+
+    Mapping     aFrom2Uno;
+    Mapping     aUno2To;
+
+    OUString    aAddPurpose;
+
+    uno_Mediate_Mapping(
+        Environment aFrom_, Environment aTo_,
+        Mapping aFrom2Uno_, Mapping aUno2To_,
+        OUString aAddPurpose );
+};
+
+}
+
+extern "C"
+{
+
+static void mediate_free( uno_Mapping * pMapping )
+{
+    delete static_cast< uno_Mediate_Mapping * >( pMapping );
+}
+
+static void mediate_acquire( uno_Mapping * pMapping )
+{
+    if (1 == osl_atomic_increment(
+        & static_cast< uno_Mediate_Mapping * >( pMapping )->nRef ))
+    {
+        uno_registerMapping(
+            &pMapping, mediate_free,
+            static_cast< uno_Mediate_Mapping * >( pMapping )->aFrom.get(),
+            static_cast< uno_Mediate_Mapping * >( pMapping )->aTo.get(),
+            static_cast< uno_Mediate_Mapping * >( pMapping )->aAddPurpose.pData );
+    }
+}
+
+static void mediate_release( uno_Mapping * pMapping )
+{
+    if (! osl_atomic_decrement(
+        & static_cast< uno_Mediate_Mapping * >( pMapping )->nRef ))
+    {
+        uno_revokeMapping( pMapping );
+    }
+}
+
+static void mediate_mapInterface(
+    uno_Mapping * pMapping,
+    void ** ppOut, void * pInterface,
+    typelib_InterfaceTypeDescription * pInterfaceTypeDescr )
+{
+    OSL_ENSURE( pMapping && ppOut, "### null ptr!" );
+    if (!(pMapping && ppOut))
+        return;
+
+    uno_Mediate_Mapping * that = static_cast< uno_Mediate_Mapping * >( pMapping );
+    uno_Mapping * pFrom2Uno = that->aFrom2Uno.get();
+
+    uno_Interface * pUnoI = nullptr;
+    (*pFrom2Uno->mapInterface)( pFrom2Uno, reinterpret_cast<void **>(&pUnoI), pInterface, pInterfaceTypeDescr );
+    if (nullptr == pUnoI)
+    {
+        void * pOut = *ppOut;
+        if (nullptr != pOut)
+        {
+            uno_ExtEnvironment * pTo = that->aTo.get()->pExtEnv;
+            OSL_ENSURE( nullptr != pTo, "### cannot release out interface: leaking!" );
+            if (nullptr != pTo)
+                (*pTo->releaseInterface)( pTo, pOut );
+            *ppOut = nullptr; // set to 0 anyway, because mapping was not successful!
+        }
+    }
+    else
+    {
+        uno_Mapping * pUno2To = that->aUno2To.get();
+        (*pUno2To->mapInterface)( pUno2To, ppOut, pUnoI, pInterfaceTypeDescr );
+        (*pUnoI->release)( pUnoI );
+    }
+}
+}
+
+uno_Mediate_Mapping::uno_Mediate_Mapping(
+    Environment aFrom_, Environment aTo_,
+    Mapping aFrom2Uno_, Mapping aUno2To_,
+    OUString aAddPurpose_ )
+    : nRef( 1 )
+    , aFrom(std::move( aFrom_ ))
+    , aTo(std::move( aTo_ ))
+    , aFrom2Uno(std::move( aFrom2Uno_ ))
+    , aUno2To(std::move( aUno2To_ ))
+    , aAddPurpose(std::move( aAddPurpose_ ))
+{
+    uno_Mapping::acquire        = mediate_acquire;
+    uno_Mapping::release        = mediate_release;
+    uno_Mapping::mapInterface   = mediate_mapInterface;
+}
+
+
+static OUString getMappingName(
+    const Environment & rFrom, const Environment & rTo, std::u16string_view rAddPurpose )
+{
+    OUStringBuffer aKey( 64 );
+    aKey.append( rAddPurpose );
+    aKey.append( ';' );
+    aKey.append( rFrom.getTypeName() );
+    aKey.append( '[' );
+    aKey.append( reinterpret_cast< sal_IntPtr >(rFrom.get()), 16 );
+    aKey.append( "];" );
+    aKey.append( rTo.getTypeName() );
+    aKey.append( '[' );
+    aKey.append( reinterpret_cast< sal_IntPtr >(rTo.get()), 16 );
+    aKey.append( ']' );
+    return aKey.makeStringAndClear();
+}
+
+static OUString getBridgeName(
+    const Environment & rFrom, const Environment & rTo, std::u16string_view rAddPurpose )
+{
+    OUStringBuffer aBridgeName( 16 );
+    if (!rAddPurpose.empty())
+    {
+        aBridgeName.append( rAddPurpose );
+        aBridgeName.append( '_' );
+    }
+    aBridgeName.append( EnvDcp::getTypeName(rFrom.getTypeName()) );
+    aBridgeName.append( '_' );
+    aBridgeName.append( EnvDcp::getTypeName(rTo.getTypeName()) );
+    return aBridgeName.makeStringAndClear();
+}
+
+#ifndef DISABLE_DYNLOADING
+
+static void setNegativeBridge( const OUString & rBridgeName )
+{
+    MappingsData & rData = getMappingsData();
+    std::scoped_lock aGuard( rData.aNegativeLibsMutex );
+    rData.aNegativeLibs.insert( rBridgeName );
+}
+
+#endif
+
+#ifdef DISABLE_DYNLOADING
+
+static uno_ext_getMappingFunc selectMapFunc( const OUString & rBridgeName )
+{
+    if (rBridgeName.equalsAscii( CPPU_CURRENT_LANGUAGE_BINDING_NAME "_uno" ))
+        return CPPU_ENV_uno_ext_getMapping;
+#if HAVE_FEATURE_JAVA
+    if (rBridgeName.equalsAscii( "java" "_uno" ))
+        return java_uno_ext_getMapping;
+#endif
+
+#if 0
+    // I don't think the affine or log bridges will be needed on any
+    // DISABLE_DYNLOADING platform (iOS at least, possibly Android), but if
+    // somebody wants to experiment, need to find out then whether these are
+    // needed.
+    if (rBridgeName.equalsAscii( "affine_uno_uno" ))
+        return affine_uno_uno_ext_getMapping;
+    if (rBridgeName.equalsAscii( "log_uno_uno" ))
+        return log_uno_uno_ext_getMapping;
+#endif
+    return 0;
+}
+
+#else
+
+static bool loadModule(osl::Module & rModule, const OUString & rBridgeName)
+{
+    bool bNeg;
+    {
+    MappingsData & rData = getMappingsData();
+    std::scoped_lock aGuard( rData.aNegativeLibsMutex );
+    const auto iFind( rData.aNegativeLibs.find( rBridgeName ) );
+    bNeg = (iFind != rData.aNegativeLibs.end());
+    }
+
+    if (!bNeg)
+    {
+        bool bModule;
+        try {
+            bModule = cppu::detail::loadModule(rModule, rBridgeName);
+        }
+        catch(...) {
+            // convert throw to return false
+            bModule = false;
+        }
+
+        if (bModule)
+            return true;
+
+        setNegativeBridge( rBridgeName ); // no load again
+    }
+    return false;
+}
+
+#endif
+
+
+static Mapping loadExternalMapping(
+    const Environment & rFrom, const Environment & rTo, const OUString & rAddPurpose )
+{
+    OSL_ASSERT( rFrom.is() && rTo.is() );
+    if (rFrom.is() && rTo.is())
+    {
+#ifdef DISABLE_DYNLOADING
+        OUString aName;
+        uno_ext_getMappingFunc fpGetMapFunc = 0;
+
+        if (EnvDcp::getTypeName(rFrom.getTypeName()) == UNO_LB_UNO)
+        {
+            aName = getBridgeName( rTo, rFrom, rAddPurpose );
+            fpGetMapFunc = selectMapFunc( aName );
+        }
+        if (! fpGetMapFunc)
+        {
+            aName = getBridgeName( rFrom, rTo, rAddPurpose );
+            fpGetMapFunc = selectMapFunc( aName );
+        }
+        if (! fpGetMapFunc)
+        {
+            aName = getBridgeName( rTo, rFrom, rAddPurpose );
+            fpGetMapFunc = selectMapFunc( aName );
+        }
+
+        if (! fpGetMapFunc)
+        {
+            SAL_INFO("cppu", "Could not find mapfunc for " << aName);
+            return Mapping();
+        }
+
+        if (fpGetMapFunc)
+        {
+            Mapping aExt;
+            (*fpGetMapFunc)( (uno_Mapping **)&aExt, rFrom.get(), rTo.get() );
+            OSL_ASSERT( aExt.is() );
+            if (aExt.is())
+                return aExt;
+            SAL_INFO("cppu", "Could not load external mapping for " << aName);
+        }
+#else
+        // find proper lib
+        osl::Module aModule;
+        bool bModule(false);
+        OUString aName;
+
+        if ( EnvDcp::getTypeName(rFrom.getTypeName()) == UNO_LB_UNO )
+        {
+            aName = getBridgeName( rTo, rFrom, rAddPurpose );
+            bModule = loadModule( aModule, aName );
+        }
+        if (!bModule)
+        {
+            aName = getBridgeName( rFrom, rTo, rAddPurpose );
+            bModule = loadModule( aModule, aName );
+        }
+        if (!bModule)
+        {
+            aName = getBridgeName( rTo, rFrom, rAddPurpose );
+            bModule = loadModule( aModule, aName );
+        }
+
+        if (bModule)
+        {
+            uno_ext_getMappingFunc fpGetMapFunc =
+                reinterpret_cast<uno_ext_getMappingFunc>(aModule.getSymbol( UNO_EXT_GETMAPPING ));
+
+            if (fpGetMapFunc)
+            {
+                Mapping aExt;
+                (*fpGetMapFunc)( reinterpret_cast<uno_Mapping **>(&aExt), rFrom.get(), rTo.get() );
+                OSL_ASSERT( aExt.is() );
+                if (aExt.is())
+                {
+                    aModule.release();
+                    return aExt;
+                }
+            }
+            aModule.unload();
+            setNegativeBridge( aName );
+        }
+#endif
+    }
+    return Mapping();
+}
+
+
+static Mapping getDirectMapping(
+    const Environment & rFrom, const Environment & rTo, const OUString & rAddPurpose = OUString() )
+
+{
+    OSL_ASSERT( rFrom.is() && rTo.is() );
+    if (rFrom.is() && rTo.is())
+    {
+        MappingsData & rData = getMappingsData();
+        ClearableMutexGuard aGuard( rData.aMappingsMutex );
+
+        // try to find registered mapping
+        const t_OUString2Entry::const_iterator iFind( rData.aName2Entry.find(
+            getMappingName( rFrom, rTo, rAddPurpose ) ) );
+
+        if (iFind == rData.aName2Entry.end())
+        {
+            aGuard.clear();
+            return loadExternalMapping( rFrom, rTo, rAddPurpose );
+        }
+        return Mapping( (*iFind).second->pMapping );
+    }
+    return Mapping();
+}
+
+
+static Mapping createMediateMapping(
+    const Environment & rFrom, const Environment & rTo,
+    const Mapping & rFrom2Uno, const Mapping & rUno2To,
+    const OUString & rAddPurpose )
+{
+    uno_Mapping * pRet = new uno_Mediate_Mapping(
+        rFrom, rTo, rFrom2Uno, rUno2To, rAddPurpose ); // ref count initially 1
+    uno_registerMapping(
+        &pRet, mediate_free, rFrom.get(), rTo.get(), rAddPurpose.pData );
+    Mapping aRet( pRet );
+    (*pRet->release)( pRet );
+    return aRet;
+}
+
+static Mapping getMediateMapping(
+    const Environment & rFrom, const Environment & rTo, const OUString & rAddPurpose )
+{
+    Environment aUno;
+    Mapping aUno2To;
+
+    // backwards: from dest to source of mapping chain
+
+    // connect to uno
+    OUString aUnoEnvTypeName( UNO_LB_UNO );
+    if (rTo.getTypeName() == aUnoEnvTypeName) // to is uno
+    {
+        aUno = rTo;
+        // no Uno2To mapping necessary
+    }
+    else
+    {
+        // get registered uno env
+        ::uno_getEnvironment( reinterpret_cast<uno_Environment **>(&aUno), aUnoEnvTypeName.pData, nullptr );
+
+        aUno2To = getDirectMapping( aUno, rTo );
+        // : uno <-> to
+        if (! aUno2To.is())
+            return Mapping();
+    }
+
+    // connect to uno
+    if (!rAddPurpose.isEmpty()) // insert purpose mapping between new ano_uno <-> uno
+    {
+        // create anonymous uno env
+        Environment aAnUno;
+        ::uno_createEnvironment( reinterpret_cast<uno_Environment **>(&aAnUno), aUnoEnvTypeName.pData, nullptr );
+
+        Mapping aAnUno2Uno( getDirectMapping( aAnUno, aUno, rAddPurpose ) );
+        if (! aAnUno2Uno.is())
+            return Mapping();
+
+        if (aUno2To.is()) // to is not uno
+        {
+            // create another purposed mediate mapping
+            aUno2To = createMediateMapping( aAnUno, rTo, aAnUno2Uno, aUno2To, rAddPurpose );
+            // : ano_uno <-> uno <-> to
+        }
+        else
+        {
+            aUno2To = aAnUno2Uno;
+            // : ano_uno <-> to (i.e., uno)
+        }
+        aUno = aAnUno;
+    }
+
+    Mapping aFrom2Uno( getDirectMapping( rFrom, aUno ) );
+    if (aFrom2Uno.is() && aUno2To.is())
+    {
+        return createMediateMapping( rFrom, rTo, aFrom2Uno, aUno2To, rAddPurpose );
+        // : from <-> some uno ...
+    }
+
+    return Mapping();
+}
+}
+
+using namespace ::cppu;
+
+extern "C"
+{
+
+void SAL_CALL uno_getMapping(
+    uno_Mapping ** ppMapping, uno_Environment * pFrom, uno_Environment * pTo,
+    rtl_uString * pAddPurpose )
+    SAL_THROW_EXTERN_C()
+{
+    assert(ppMapping != nullptr);
+    assert(pFrom != nullptr);
+    assert(pTo != nullptr);
+    if (*ppMapping)
+    {
+        (*(*ppMapping)->release)( *ppMapping );
+        *ppMapping = nullptr;
+    }
+
+    Mapping aRet;
+    Environment aFrom( pFrom ), aTo( pTo );
+
+    OUString aAddPurpose;
+    if (pAddPurpose)
+        aAddPurpose = pAddPurpose;
+
+    MappingsData & rData = getMappingsData();
+
+    // try registered mapping
+    {
+    MutexGuard aGuard( rData.aMappingsMutex );
+    const t_OUString2Entry::const_iterator iFind( rData.aName2Entry.find(
+        getMappingName( aFrom, aTo, aAddPurpose ) ) );
+    if (iFind != rData.aName2Entry.end())
+        aRet = (*iFind).second->pMapping;
+    }
+
+    // See if an identity mapping does fit.
+    if (!aRet.is() && pFrom == pTo && aAddPurpose.isEmpty())
+        aRet = createIdentityMapping(pFrom);
+
+    if (!aRet.is())
+    {
+        getCascadeMapping(ppMapping, pFrom, pTo, pAddPurpose);
+
+        if (*ppMapping)
+            return;
+
+        // try callback chain
+        {
+            std::unique_lock aGuard(rData.aCallbacksMutex);
+            for (const auto& rCallback : rData.aCallbacks)
+            {
+                (*rCallback)(ppMapping, pFrom, pTo, aAddPurpose.pData);
+                if (*ppMapping)
+                    return;
+            }
+        }
+
+        aRet = loadExternalMapping( aFrom, aTo, aAddPurpose ); // direct try
+        if (! aRet.is())
+            aRet = getMediateMapping( aFrom, aTo, aAddPurpose ); // try via uno
+    }
+
+    if (aRet.is())
+    {
+        (*aRet.get()->acquire)( aRet.get() );
+        *ppMapping = aRet.get();
+    }
+}
+
+void SAL_CALL uno_getMappingByName(
+    uno_Mapping ** ppMapping, rtl_uString * pFrom, rtl_uString * pTo,
+    rtl_uString * pAddPurpose )
+    SAL_THROW_EXTERN_C()
+{
+    assert(ppMapping && pFrom && pTo && "### null ptr!");
+    if (*ppMapping)
+    {
+        (*(*ppMapping)->release)( *ppMapping );
+        *ppMapping = nullptr;
+    }
+
+    uno_Environment * pEFrom = nullptr;
+    uno_getEnvironment( &pEFrom, pFrom, nullptr );
+    OSL_ENSURE( pEFrom, "### cannot get source environment!" );
+    if (pEFrom)
+    {
+        uno_Environment * pETo = nullptr;
+        uno_getEnvironment( &pETo, pTo, nullptr );
+        OSL_ENSURE( pETo, "### cannot get target environment!" );
+        if (pETo)
+        {
+            ::uno_getMapping( ppMapping, pEFrom, pETo, pAddPurpose );
+            (*pETo->release)( pETo );
+        }
+        (*pEFrom->release)( pEFrom );
+    }
+}
+
+
+void SAL_CALL uno_registerMapping(
+    uno_Mapping ** ppMapping, uno_freeMappingFunc freeMapping,
+    uno_Environment * pFrom, uno_Environment * pTo, rtl_uString * pAddPurpose )
+    SAL_THROW_EXTERN_C()
+{
+    MappingsData & rData = getMappingsData();
+    ClearableMutexGuard aGuard( rData.aMappingsMutex );
+
+    const t_Mapping2Entry::const_iterator iFind( rData.aMapping2Entry.find( *ppMapping ) );
+    if (iFind == rData.aMapping2Entry.end())
+    {
+        OUString aMappingName(
+            getMappingName( pFrom, pTo, pAddPurpose ? OUString(pAddPurpose) : OUString() ) );
+        SAL_INFO("cppu", "> inserting new mapping: " << aMappingName);
+        // count initially 1
+        MappingEntry * pEntry = new MappingEntry( *ppMapping, freeMapping, aMappingName );
+        rData.aName2Entry[ aMappingName ] = pEntry;
+        rData.aMapping2Entry[ *ppMapping ] = pEntry;
+    }
+    else
+    {
+        MappingEntry * pEntry = (*iFind).second;
+        ++pEntry->nRef;
+
+        if (pEntry->pMapping != *ppMapping) // exchange mapping to be registered
+        {
+            (*pEntry->pMapping->acquire)( pEntry->pMapping );
+            --pEntry->nRef; // correct count; kill mapping to be registered
+            aGuard.clear();
+            (*freeMapping)( *ppMapping );
+            *ppMapping = pEntry->pMapping;
+        }
+    }
+}
+
+void SAL_CALL uno_revokeMapping(
+    uno_Mapping * pMapping )
+    SAL_THROW_EXTERN_C()
+{
+    MappingsData & rData = getMappingsData();
+    ClearableMutexGuard aGuard( rData.aMappingsMutex );
+
+    const t_Mapping2Entry::const_iterator iFind( rData.aMapping2Entry.find( pMapping ) );
+    OSL_ASSERT( iFind != rData.aMapping2Entry.end() );
+    MappingEntry * pEntry = (*iFind).second;
+    if (! --pEntry->nRef)
+    {
+        rData.aMapping2Entry.erase( pEntry->pMapping );
+        rData.aName2Entry.erase( pEntry->aMappingName );
+        aGuard.clear();
+        SAL_INFO("cppu", "> revoking mapping " << pEntry->aMappingName);
+        (*pEntry->freeMapping)( pEntry->pMapping );
+        delete pEntry;
+    }
+}
+
+
+void SAL_CALL uno_registerMappingCallback(
+    uno_getMappingFunc pCallback )
+    SAL_THROW_EXTERN_C()
+{
+    OSL_ENSURE( pCallback, "### null ptr!" );
+    MappingsData & rData = getMappingsData();
+    std::unique_lock aGuard( rData.aCallbacksMutex );
+    rData.aCallbacks.insert( pCallback );
+}
+
+void SAL_CALL uno_revokeMappingCallback(
+    uno_getMappingFunc pCallback )
+    SAL_THROW_EXTERN_C()
+{
+    OSL_ENSURE( pCallback, "### null ptr!" );
+    MappingsData & rData = getMappingsData();
+    std::unique_lock aGuard( rData.aCallbacksMutex );
+    rData.aCallbacks.erase( pCallback );
+}
+} // extern "C"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/loadmodule.cxx b/cppu/source/uno/loadmodule.cxx
new file mode 100644
index 000000000..f2811a595
--- /dev/null
+++ b/cppu/source/uno/loadmodule.cxx
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <sal/config.h>
+
+#include <cassert>
+
+#include <osl/module.h>
+#include <osl/module.hxx>
+#include <rtl/malformeduriexception.hxx>
+#include <rtl/uri.hxx>
+#include <rtl/ustring.hxx>
+#include <sal/log.hxx>
+
+#include "loadmodule.hxx"
+
+namespace cppu::detail {
+
+#ifndef DISABLE_DYNLOADING
+
+bool loadModule(osl::Module& rModule, OUString const & name) {
+    static OUString base = [] {
+            OUString url;
+            if (!osl::Module::getUrlFromAddress(
+                    reinterpret_cast<oslGenericFunction>(&loadModule), url))
+            {
+                SAL_WARN("cppu", "osl::Module::getUrlFromAddress failed");
+                return OUString();
+            }
+            assert(!url.isEmpty());
+            return url;
+        }();
+    if (base.isEmpty()) {
+        SAL_INFO("cppu", "osl::Module::getUrlFromAddress had failed");
+        return false;
+    }
+    OUString b =
+#if defined SAL_DLLPREFIX
+        SAL_DLLPREFIX +
+#endif
+        name +
+        SAL_DLLEXTENSION;
+    try {
+        b = rtl::Uri::convertRelToAbs(base, b);
+    } catch (rtl::MalformedUriException & e) {
+        SAL_INFO("cppu", "rtl::MalformedUriException <" << e.getMessage() << ">");
+        return false;
+    }
+    return rModule.load(
+        b,
+        SAL_LOADMODULE_GLOBAL | SAL_LOADMODULE_LAZY);
+}
+
+#endif
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/loadmodule.hxx b/cppu/source/uno/loadmodule.hxx
new file mode 100644
index 000000000..694b14024
--- /dev/null
+++ b/cppu/source/uno/loadmodule.hxx
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <sal/config.h>
+#include <rtl/ustring.hxx>
+
+namespace osl
+{
+class Module;
+}
+
+namespace cppu::detail
+{
+#ifndef DISABLE_DYNLOADING
+
+/** Load a module.
+
+    @param name
+    the nucleus of a module name (without any "lib...so", ".dll", etc.
+    decoration, and without a path).
+
+    @return false if the module could not be loaded, otherwise true
+*/
+bool loadModule(osl::Module& rModule, OUString const& name);
+
+#endif
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/prim.hxx b/cppu/source/uno/prim.hxx
new file mode 100644
index 000000000..733baec0f
--- /dev/null
+++ b/cppu/source/uno/prim.hxx
@@ -0,0 +1,153 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <typelib/typedescription.h>
+#include <typelib/typeclass.h>
+#include <uno/sequence2.h>
+#include <uno/any2.h>
+#include <uno/data.h>
+#include <uno/mapping.h>
+#include <uno/dispatcher.h>
+
+#include <osl/interlck.h>
+#include <stdint.h>
+
+namespace cppu
+{
+
+extern uno_Sequence g_emptySeq;
+extern typelib_TypeDescriptionReference * g_pVoidType;
+
+
+inline void * _map(
+    void * p,
+    typelib_TypeDescriptionReference * pType, typelib_TypeDescription * pTypeDescr,
+    uno_Mapping * mapping )
+
+{
+    void * pRet = nullptr;
+    if (p)
+    {
+        if (pTypeDescr)
+        {
+            (*mapping->mapInterface)(
+                mapping, &pRet, p, reinterpret_cast<typelib_InterfaceTypeDescription *>(pTypeDescr) );
+        }
+        else
+        {
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+            (*mapping->mapInterface)(
+                mapping, &pRet, p, reinterpret_cast<typelib_InterfaceTypeDescription *>(pTypeDescr) );
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+    }
+    return pRet;
+}
+
+inline void _acquire( void * p, uno_AcquireFunc acquire )
+{
+    if (p)
+    {
+        if (acquire)
+        {
+            (*acquire)( p );
+        }
+        else
+        {
+            (*static_cast<uno_Interface *>(p)->acquire)( static_cast<uno_Interface *>(p) );
+        }
+    }
+}
+
+inline void _release( void * p, uno_ReleaseFunc release )
+{
+    if (p)
+    {
+        if (release)
+        {
+            (*release)( p );
+        }
+        else
+        {
+            (*static_cast<uno_Interface *>(p)->release)( static_cast<uno_Interface *>(p) );
+        }
+    }
+}
+
+
+inline sal_uInt32 calcSeqMemSize(
+    sal_Int32 nElementSize, sal_Int32 nElements )
+{
+    sal_uInt64 nSize =
+        static_cast<sal_uInt64>(SAL_SEQUENCE_HEADER_SIZE) +
+        (static_cast<sal_uInt64>(nElementSize) * static_cast<sal_uInt64>(nElements));
+    if (nSize > 0xffffffffU)
+        return 0;
+    else
+        return static_cast<sal_uInt32>(nSize);
+}
+
+
+inline uno_Sequence * createEmptySequence()
+{
+    osl_atomic_increment( &g_emptySeq.nRefCount );
+    return &g_emptySeq;
+}
+
+inline typelib_TypeDescriptionReference * _getVoidType()
+{
+    if (! g_pVoidType)
+    {
+        g_pVoidType = * ::typelib_static_type_getByTypeClass( typelib_TypeClass_VOID );
+    }
+    ::typelib_typedescriptionreference_acquire( g_pVoidType );
+    return g_pVoidType;
+}
+
+inline void CONSTRUCT_EMPTY_ANY(uno_Any * pAny) {
+    pAny->pType = _getVoidType();
+#if OSL_DEBUG_LEVEL > 0
+    pAny->pData = reinterpret_cast<void *>(uintptr_t(0xdeadbeef));
+#else
+    pAny->pData = pAny;
+#endif
+}
+
+#define TYPE_ACQUIRE( pType ) \
+    osl_atomic_increment( &(pType)->nRefCount );
+
+
+extern "C" void * binuno_queryInterface(
+    void * pUnoI, typelib_TypeDescriptionReference * pDestType );
+
+
+inline bool _type_equals(
+    typelib_TypeDescriptionReference const * pType1, typelib_TypeDescriptionReference const * pType2 )
+
+{
+    return (pType1 == pType2 ||
+            (pType1->eTypeClass == pType2->eTypeClass &&
+             pType1->pTypeName->length == pType2->pTypeName->length &&
+             ::rtl_ustr_compare( pType1->pTypeName->buffer, pType2->pTypeName->buffer ) == 0));
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/cppu/source/uno/sequence.cxx b/cppu/source/uno/sequence.cxx
new file mode 100644
index 000000000..c467f2c38
--- /dev/null
+++ b/cppu/source/uno/sequence.cxx
@@ -0,0 +1,912 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cassert>
+#include <string.h>
+
+#include <osl/diagnose.h>
+#include <osl/interlck.h>
+#include <typelib/typedescription.h>
+#include <uno/data.h>
+#include <uno/sequence2.h>
+
+#include "constr.hxx"
+#include "copy.hxx"
+#include "destr.hxx"
+
+
+using namespace cppu;
+
+namespace cppu
+{
+
+
+static uno_Sequence * reallocSeq(
+    uno_Sequence * pReallocate, std::size_t nElementSize, sal_Int32 nElements )
+{
+    OSL_ASSERT( nElements >= 0 );
+    uno_Sequence * pNew = nullptr;
+    sal_uInt32 nSize = calcSeqMemSize( nElementSize, nElements );
+    if (nSize > 0)
+    {
+        if (pReallocate == nullptr)
+        {
+            pNew = static_cast<uno_Sequence *>(std::malloc( nSize ));
+        }
+        else
+        {
+            pNew = static_cast<uno_Sequence *>(std::realloc( pReallocate, nSize ));
+        }
+        if (pNew != nullptr)
+        {
+            // header init
+            pNew->nRefCount = 1;
+            pNew->nElements = nElements;
+        }
+    }
+    return pNew;
+}
+
+
+static bool idefaultConstructElements(
+    uno_Sequence ** ppSeq,
+    typelib_TypeDescriptionReference * pElementType,
+    sal_Int32 nStartIndex, sal_Int32 nStopIndex,
+    sal_Int32 nAlloc ) // >= 0 means (re)alloc memory for nAlloc elements
+{
+    uno_Sequence * pSeq = *ppSeq;
+    switch (pElementType->eTypeClass)
+    {
+    case typelib_TypeClass_CHAR:
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(sal_Unicode), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memset(
+                pSeq->elements + (sizeof(sal_Unicode) * nStartIndex),
+                0,
+                sizeof(sal_Unicode) * (nStopIndex - nStartIndex) );
+        }
+        break;
+    case typelib_TypeClass_BOOLEAN:
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(sal_Bool), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memset(
+                pSeq->elements + (sizeof(sal_Bool) * nStartIndex),
+                0,
+                sizeof(sal_Bool) * (nStopIndex - nStartIndex) );
+        }
+        break;
+    case typelib_TypeClass_BYTE:
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(sal_Int8), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memset(
+                pSeq->elements + (sizeof(sal_Int8) * nStartIndex),
+                0,
+                sizeof(sal_Int8) * (nStopIndex - nStartIndex) );
+        }
+        break;
+    case typelib_TypeClass_SHORT:
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(sal_Int16), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memset(
+                pSeq->elements + (sizeof(sal_Int16) * nStartIndex),
+                0,
+                sizeof(sal_Int16) * (nStopIndex - nStartIndex) );
+        }
+        break;
+    case typelib_TypeClass_LONG:
+    case typelib_TypeClass_UNSIGNED_LONG:
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(sal_Int32), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memset(
+                pSeq->elements + (sizeof(sal_Int32) * nStartIndex),
+                0,
+                sizeof(sal_Int32) * (nStopIndex - nStartIndex) );
+        }
+        break;
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(sal_Int64), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memset(
+                pSeq->elements + (sizeof(sal_Int64) * nStartIndex),
+                0,
+                sizeof(sal_Int64) * (nStopIndex - nStartIndex) );
+        }
+        break;
+    case typelib_TypeClass_FLOAT:
+    {
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(float), nAlloc );
+        if (pSeq != nullptr)
+        {
+            float * pElements = reinterpret_cast<float *>(pSeq->elements);
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                pElements[nPos] = 0.0;
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_DOUBLE:
+    {
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(double), nAlloc );
+        if (pSeq != nullptr)
+        {
+            double * pElements = reinterpret_cast<double *>(pSeq->elements);
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                pElements[nPos] = 0.0;
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_STRING:
+    {
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(rtl_uString *), nAlloc );
+        if (pSeq != nullptr)
+        {
+            rtl_uString ** pElements = reinterpret_cast<rtl_uString **>(pSeq->elements);
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                pElements[nPos] = nullptr;
+                rtl_uString_new( &pElements[nPos] );
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_TYPE:
+    {
+        if (nAlloc >= 0)
+        {
+            pSeq = reallocSeq(
+                pSeq, sizeof(typelib_TypeDescriptionReference *), nAlloc );
+        }
+        if (pSeq != nullptr)
+        {
+            typelib_TypeDescriptionReference ** pElements =
+                reinterpret_cast<typelib_TypeDescriptionReference **>(pSeq->elements);
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                pElements[nPos] = _getVoidType();
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_ANY:
+    {
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(uno_Any), nAlloc );
+        if (pSeq != nullptr)
+        {
+            uno_Any * pElements = reinterpret_cast<uno_Any *>(pSeq->elements);
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                CONSTRUCT_EMPTY_ANY( &pElements[nPos] );
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_ENUM:
+    {
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(sal_Int32), nAlloc );
+        if (pSeq != nullptr)
+        {
+            typelib_TypeDescription * pElementTypeDescr = nullptr;
+            TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+            sal_Int32 eEnum =
+                reinterpret_cast<typelib_EnumTypeDescription *>(
+                 pElementTypeDescr)->nDefaultEnumValue;
+            TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+
+            sal_Int32 * pElements = reinterpret_cast<sal_Int32 *>(pSeq->elements);
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                pElements[nPos] = eEnum;
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+    {
+        typelib_TypeDescription * pElementTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+        sal_Int32 nElementSize = pElementTypeDescr->nSize;
+
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, nElementSize, nAlloc );
+        if (pSeq != nullptr)
+        {
+            char * pElements = pSeq->elements;
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                _defaultConstructStruct(
+                    pElements + (nElementSize * nPos),
+                    reinterpret_cast<typelib_CompoundTypeDescription *>(pElementTypeDescr) );
+            }
+        }
+
+        TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        break;
+    }
+    case typelib_TypeClass_SEQUENCE:
+    {
+        if (nAlloc >= 0)
+        {
+            // coverity[suspicious_sizeof : FALSE] - sizeof(uno_Sequence*) is correct here
+            pSeq = reallocSeq(pSeq, sizeof(uno_Sequence*), nAlloc);
+        }
+        if (pSeq != nullptr)
+        {
+            uno_Sequence ** pElements =
+                reinterpret_cast<uno_Sequence **>(pSeq->elements);
+            for ( sal_Int32 nPos = nStartIndex; nPos < nStopIndex; ++nPos )
+            {
+                pElements[nPos] = createEmptySequence();
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_INTERFACE: // either C++ or C-UNO interface
+        if (nAlloc >= 0)
+            pSeq = reallocSeq( pSeq, sizeof(void *), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memset(
+                pSeq->elements + (sizeof(void *) * nStartIndex),
+                0,
+                sizeof(void *) * (nStopIndex - nStartIndex) );
+        }
+        break;
+    default:
+        OSL_FAIL( "### unexpected element type!" );
+        pSeq = nullptr;
+        break;
+    }
+
+    if (pSeq == nullptr)
+    {
+        OSL_ASSERT( nAlloc >= 0 ); // must have been an allocation failure
+        return false;
+    }
+    *ppSeq = pSeq;
+    return true;
+}
+
+// coverity[ -tainted_data_sink : arg-1 ]
+static bool icopyConstructFromElements(
+    uno_Sequence ** ppSeq, void * pSourceElements,
+    typelib_TypeDescriptionReference * pElementType,
+    sal_Int32 nStopIndex,
+    uno_AcquireFunc acquire,
+    sal_Int32 nAlloc )
+{
+    uno_Sequence * pSeq = *ppSeq;
+    switch (pElementType->eTypeClass)
+    {
+    case typelib_TypeClass_CHAR:
+        pSeq = reallocSeq( pSeq, sizeof(sal_Unicode), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(sal_Unicode) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_BOOLEAN:
+        pSeq = reallocSeq( pSeq, sizeof(sal_Bool), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(sal_Bool) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_BYTE:
+        pSeq = reallocSeq( pSeq, sizeof(sal_Int8), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(sal_Int8) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_SHORT:
+    case typelib_TypeClass_UNSIGNED_SHORT:
+        pSeq = reallocSeq( pSeq, sizeof(sal_Int16), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(sal_Int16) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_LONG:
+    case typelib_TypeClass_UNSIGNED_LONG:
+        pSeq = reallocSeq( pSeq, sizeof(sal_Int32), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(sal_Int32) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_HYPER:
+    case typelib_TypeClass_UNSIGNED_HYPER:
+        pSeq = reallocSeq( pSeq, sizeof(sal_Int64), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(sal_Int64) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_FLOAT:
+        pSeq = reallocSeq( pSeq, sizeof(float), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(float) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_DOUBLE:
+        pSeq = reallocSeq( pSeq, sizeof(double), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(double) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_ENUM:
+        pSeq = reallocSeq( pSeq, sizeof(sal_Int32), nAlloc );
+        if (pSeq != nullptr)
+        {
+            memcpy(
+                pSeq->elements,
+                pSourceElements,
+                sizeof(sal_Int32) * nStopIndex );
+        }
+        break;
+    case typelib_TypeClass_STRING:
+    {
+        pSeq = reallocSeq( pSeq, sizeof(rtl_uString *), nAlloc );
+        if (pSeq != nullptr)
+        {
+            rtl_uString ** pDestElements = reinterpret_cast<rtl_uString **>(pSeq->elements);
+            for ( sal_Int32 nPos = 0; nPos < nStopIndex; ++nPos )
+            {
+                // This code tends to trigger coverity's overrun-buffer-arg warning
+                // coverity[index_parm_via_loop_bound] - https://communities.coverity.com/thread/2993
+                ::rtl_uString_acquire(
+                    static_cast<rtl_uString **>(pSourceElements)[nPos] );
+                pDestElements[nPos] = static_cast<rtl_uString **>(pSourceElements)[nPos];
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_TYPE:
+    {
+        pSeq = reallocSeq(
+            pSeq, sizeof(typelib_TypeDescriptionReference *), nAlloc );
+        if (pSeq != nullptr)
+        {
+            typelib_TypeDescriptionReference ** pDestElements =
+                reinterpret_cast<typelib_TypeDescriptionReference **>(pSeq->elements);
+            for ( sal_Int32 nPos = 0; nPos < nStopIndex; ++nPos )
+            {
+                TYPE_ACQUIRE(
+                    static_cast<typelib_TypeDescriptionReference **>(
+                     pSourceElements)[nPos] );
+                pDestElements[nPos] =
+                    static_cast<typelib_TypeDescriptionReference **>(
+                     pSourceElements)[nPos];
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_ANY:
+    {
+        pSeq = reallocSeq( pSeq, sizeof(uno_Any), nAlloc );
+        if (pSeq != nullptr)
+        {
+            uno_Any * pDestElements = reinterpret_cast<uno_Any *>(pSeq->elements);
+            for ( sal_Int32 nPos = 0; nPos < nStopIndex; ++nPos )
+            {
+                uno_Any * pSource = static_cast<uno_Any *>(pSourceElements) + nPos;
+                _copyConstructAny(
+                    &pDestElements[nPos],
+                    pSource->pData,
+                    pSource->pType, nullptr,
+                    acquire, nullptr );
+            }
+        }
+        break;
+    }
+    case typelib_TypeClass_STRUCT:
+    case typelib_TypeClass_EXCEPTION:
+    {
+        typelib_TypeDescription * pElementTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+        sal_Int32 nElementSize = pElementTypeDescr->nSize;
+
+        pSeq = reallocSeq( pSeq, nElementSize, nAlloc );
+        if (pSeq != nullptr)
+        {
+            char * pDestElements = pSeq->elements;
+
+            typelib_CompoundTypeDescription * pTypeDescr =
+                reinterpret_cast<typelib_CompoundTypeDescription *>(pElementTypeDescr);
+            for ( sal_Int32 nPos = 0; nPos < nStopIndex; ++nPos )
+            {
+                char * pDest =
+                    pDestElements + (nElementSize * nPos);
+                char * pSource =
+                    static_cast<char *>(pSourceElements) + (nElementSize * nPos);
+
+                if (pTypeDescr->pBaseTypeDescription)
+                {
+                    // copy base value
+                    _copyConstructStruct(
+                        pDest, pSource,
+                        pTypeDescr->pBaseTypeDescription, acquire, nullptr );
+                }
+
+                // then copy members
+                typelib_TypeDescriptionReference ** ppTypeRefs =
+                    pTypeDescr->ppTypeRefs;
+                sal_Int32 * pMemberOffsets = pTypeDescr->pMemberOffsets;
+                sal_Int32 nDescr = pTypeDescr->nMembers;
+
+                while (nDescr--)
+                {
+                    ::uno_type_copyData(
+                        pDest + pMemberOffsets[nDescr],
+                        pSource + pMemberOffsets[nDescr],
+                        ppTypeRefs[nDescr], acquire );
+                }
+            }
+        }
+
+        TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        break;
+    }
+    case typelib_TypeClass_SEQUENCE: // sequence of sequence
+    {
+        // coverity[suspicious_sizeof : FALSE] - sizeof(uno_Sequence*) is correct here
+        pSeq = reallocSeq(pSeq, sizeof(uno_Sequence*), nAlloc);
+        if (pSeq != nullptr)
+        {
+            typelib_TypeDescription * pElementTypeDescr = nullptr;
+            TYPELIB_DANGER_GET( &pElementTypeDescr, pElementType );
+            typelib_TypeDescriptionReference * pSeqElementType =
+                reinterpret_cast<typelib_IndirectTypeDescription *>(pElementTypeDescr)->pType;
+            uno_Sequence ** pDestElements = reinterpret_cast<uno_Sequence **>(pSeq->elements);
+            for ( sal_Int32 nPos = 0; nPos < nStopIndex; ++nPos )
+            {
+                uno_Sequence * pNew = icopyConstructSequence(
+                    static_cast<uno_Sequence **>(pSourceElements)[nPos],
+                    pSeqElementType, acquire, nullptr );
+                OSL_ASSERT( pNew != nullptr );
+                // ought never be a memory allocation problem,
+                // because of reference counted sequence handles
+                pDestElements[ nPos ] = pNew;
+            }
+            TYPELIB_DANGER_RELEASE( pElementTypeDescr );
+        }
+        break;
+    }
+    case typelib_TypeClass_INTERFACE:
+    {
+        pSeq = reallocSeq( pSeq, sizeof(void *), nAlloc );
+        if (pSeq != nullptr)
+        {
+            void ** pDestElements = reinterpret_cast<void **>(pSeq->elements);
+            for ( sal_Int32 nPos = 0; nPos < nStopIndex; ++nPos )
+            {
+                pDestElements[nPos] = static_cast<void **>(pSourceElements)[nPos];
+                _acquire( pDestElements[nPos], acquire );
+            }
+        }
+        break;
+    }
+    default:
+        OSL_FAIL( "### unexpected element type!" );
+        pSeq = nullptr;
+        break;
+    }
+
+    if (pSeq == nullptr)
+    {
+        return false; // allocation failure
+    }
+    *ppSeq = pSeq;
+    return true;
+}
+
+
+static bool ireallocSequence(
+    uno_Sequence ** ppSequence,
+    typelib_TypeDescriptionReference * pElementType,
+    sal_Int32 nSize,
+    uno_AcquireFunc acquire, uno_ReleaseFunc release )
+{
+    bool ret = true;
+    uno_Sequence * pSeq = *ppSequence;
+    sal_Int32 nElements = pSeq->nElements;
+
+    if (pSeq->nRefCount > 1 ||
+        // not mem-copyable elements?
+        typelib_TypeClass_ANY == pElementType->eTypeClass ||
+        typelib_TypeClass_STRUCT == pElementType->eTypeClass ||
+        typelib_TypeClass_EXCEPTION == pElementType->eTypeClass)
+    {
+        // split sequence and construct new one from scratch
+        uno_Sequence * pNew = nullptr;
+
+        sal_Int32 nRest = nSize - nElements;
+        sal_Int32 nCopy = (nRest > 0 ? nElements : nSize);
+
+        if (nCopy >= 0)
+        {
+            ret = icopyConstructFromElements(
+                &pNew, pSeq->elements, pElementType,
+                nCopy, acquire,
+                nSize ); // alloc to nSize
+        }
+        if (ret && nRest > 0)
+        {
+            ret = idefaultConstructElements(
+                &pNew, pElementType,
+                nCopy, nSize,
+                nCopy >= 0 ? -1 /* no mem allocation */ : nSize );
+        }
+
+        if (ret)
+        {
+            // destruct sequence
+            if (osl_atomic_decrement( &pSeq->nRefCount ) == 0)
+            {
+                if (nElements > 0)
+                {
+                    idestructElements(
+                        pSeq->elements, pElementType,
+                        0, nElements, release );
+                }
+                std::free( pSeq );
+            }
+            *ppSequence = pNew;
+        }
+    }
+    else
+    {
+        OSL_ASSERT( pSeq->nRefCount == 1 );
+        if (nSize > nElements) // default construct the rest
+        {
+            ret = idefaultConstructElements(
+                ppSequence, pElementType,
+                nElements, nSize,
+                nSize ); // realloc to nSize
+        }
+        else // or destruct the rest and realloc mem
+        {
+            sal_Int32 nElementSize = idestructElements(
+                pSeq->elements, pElementType,
+                nSize, nElements, release );
+            // warning: it is assumed that the following will never fail,
+            //          else this leads to a sequence null handle
+            *ppSequence = reallocSeq( pSeq, nElementSize, nSize );
+            OSL_ASSERT( *ppSequence != nullptr );
+            ret = (*ppSequence != nullptr);
+        }
+    }
+
+    return ret;
+}
+
+}
+
+extern "C"
+{
+
+sal_Bool SAL_CALL uno_type_sequence_construct(
+    uno_Sequence ** ppSequence, typelib_TypeDescriptionReference * pType,
+    void * pElements, sal_Int32 len,
+    uno_AcquireFunc acquire )
+    SAL_THROW_EXTERN_C()
+{
+    assert( len >= 0 );
+    bool ret;
+    if (len)
+    {
+        typelib_TypeDescription * pTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pTypeDescr, pType );
+
+        typelib_TypeDescriptionReference * pElementType =
+            reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType;
+
+        *ppSequence = nullptr;
+        if (pElements == nullptr)
+        {
+            ret = idefaultConstructElements(
+                ppSequence, pElementType,
+                0, len,
+                len ); // alloc to len
+        }
+        else
+        {
+            ret = icopyConstructFromElements(
+                ppSequence, pElements, pElementType,
+                len, acquire,
+                len ); // alloc to len
+        }
+
+        TYPELIB_DANGER_RELEASE( pTypeDescr );
+    }
+    else
+    {
+        *ppSequence = createEmptySequence();
+        ret = true;
+    }
+
+    OSL_ASSERT( (*ppSequence != nullptr) == ret );
+    return ret;
+}
+
+
+sal_Bool SAL_CALL uno_sequence_construct(
+    uno_Sequence ** ppSequence, typelib_TypeDescription * pTypeDescr,
+    void * pElements, sal_Int32 len,
+    uno_AcquireFunc acquire )
+    SAL_THROW_EXTERN_C()
+{
+    bool ret;
+    if (len > 0)
+    {
+        typelib_TypeDescriptionReference * pElementType =
+            reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType;
+
+        *ppSequence = nullptr;
+        if (pElements == nullptr)
+        {
+            ret = idefaultConstructElements(
+                ppSequence, pElementType,
+                0, len,
+                len ); // alloc to len
+        }
+        else
+        {
+            ret = icopyConstructFromElements(
+                ppSequence, pElements, pElementType,
+                len, acquire,
+                len ); // alloc to len
+        }
+    }
+    else
+    {
+        *ppSequence = createEmptySequence();
+        ret = true;
+    }
+
+    OSL_ASSERT( (*ppSequence != nullptr) == ret );
+    return ret;
+}
+
+
+sal_Bool SAL_CALL uno_type_sequence_realloc(
+    uno_Sequence ** ppSequence, typelib_TypeDescriptionReference * pType,
+    sal_Int32 nSize, uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    assert(ppSequence && "### null ptr!");
+    assert(nSize >= 0 && "### new size must be at least 0!");
+
+    bool ret = true;
+    if (nSize != (*ppSequence)->nElements)
+    {
+        typelib_TypeDescription * pTypeDescr = nullptr;
+        TYPELIB_DANGER_GET( &pTypeDescr, pType );
+        ret = ireallocSequence(
+            ppSequence, reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+            nSize, acquire, release );
+        TYPELIB_DANGER_RELEASE( pTypeDescr );
+    }
+    return ret;
+}
+
+
+sal_Bool SAL_CALL uno_sequence_realloc(
+    uno_Sequence ** ppSequence, typelib_TypeDescription * pTypeDescr,
+    sal_Int32 nSize, uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    OSL_ENSURE( ppSequence, "### null ptr!" );
+    OSL_ENSURE( nSize >= 0, "### new size must be at least 0!" );
+
+    bool ret = true;
+    if (nSize != (*ppSequence)->nElements)
+    {
+        ret = ireallocSequence(
+            ppSequence, reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+            nSize, acquire, release );
+    }
+    return ret;
+}
+
+
+sal_Bool SAL_CALL uno_type_sequence_reference2One(
+    uno_Sequence ** ppSequence,
+    typelib_TypeDescriptionReference * pType,
+    uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    OSL_ENSURE( ppSequence, "### null ptr!" );
+    bool ret = true;
+    uno_Sequence * pSequence = *ppSequence;
+    if (pSequence->nRefCount > 1)
+    {
+        uno_Sequence * pNew = nullptr;
+        if (pSequence->nElements > 0)
+        {
+            typelib_TypeDescription * pTypeDescr = nullptr;
+            TYPELIB_DANGER_GET( &pTypeDescr, pType );
+
+            ret = icopyConstructFromElements(
+                &pNew, pSequence->elements,
+                reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+                pSequence->nElements, acquire,
+                pSequence->nElements ); // alloc nElements
+            if (ret)
+            {
+                idestructSequence( *ppSequence, pType, pTypeDescr, release );
+                *ppSequence = pNew;
+            }
+
+            TYPELIB_DANGER_RELEASE( pTypeDescr );
+        }
+        else
+        {
+            pNew = allocSeq( 0, 0 );
+            ret = (pNew != nullptr);
+            if (ret)
+            {
+                // easy destruction of empty sequence:
+                if (osl_atomic_decrement( &pSequence->nRefCount ) == 0)
+                    std::free( pSequence );
+                *ppSequence = pNew;
+            }
+        }
+    }
+    return ret;
+}
+
+
+sal_Bool SAL_CALL uno_sequence_reference2One(
+    uno_Sequence ** ppSequence,
+    typelib_TypeDescription * pTypeDescr,
+    uno_AcquireFunc acquire, uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    OSL_ENSURE( ppSequence, "### null ptr!" );
+    bool ret = true;
+    uno_Sequence * pSequence = *ppSequence;
+    if (pSequence->nRefCount > 1)
+    {
+        uno_Sequence * pNew = nullptr;
+        if (pSequence->nElements > 0)
+        {
+            ret = icopyConstructFromElements(
+                &pNew, pSequence->elements,
+                reinterpret_cast<typelib_IndirectTypeDescription *>(pTypeDescr)->pType,
+                pSequence->nElements, acquire,
+                pSequence->nElements ); // alloc nElements
+            if (ret)
+            {
+                idestructSequence(
+                    pSequence, pTypeDescr->pWeakRef, pTypeDescr, release );
+                *ppSequence = pNew;
+            }
+        }
+        else
+        {
+            pNew = allocSeq( 0, 0 );
+            ret = (pNew != nullptr);
+            if (ret)
+            {
+                // easy destruction of empty sequence:
+                if (osl_atomic_decrement( &pSequence->nRefCount ) == 0)
+                    std::free( pSequence );
+                *ppSequence = pNew;
+            }
+        }
+
+    }
+    return ret;
+}
+
+
+void SAL_CALL uno_sequence_assign(
+    uno_Sequence ** ppDest,
+    uno_Sequence * pSource,
+    typelib_TypeDescription * pTypeDescr,
+    uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    if (*ppDest != pSource)
+    {
+        osl_atomic_increment( &pSource->nRefCount );
+        idestructSequence( *ppDest, pTypeDescr->pWeakRef, pTypeDescr, release );
+        *ppDest = pSource;
+    }
+}
+
+
+void SAL_CALL uno_type_sequence_assign(
+    uno_Sequence ** ppDest,
+    uno_Sequence * pSource,
+    typelib_TypeDescriptionReference * pType,
+    uno_ReleaseFunc release )
+    SAL_THROW_EXTERN_C()
+{
+    if (*ppDest != pSource)
+    {
+        osl_atomic_increment( &pSource->nRefCount );
+        idestructSequence( *ppDest, pType, nullptr, release );
+        *ppDest = pSource;
+    }
+}
+
+void uno_type_sequence_destroy(
+    uno_Sequence * sequence, typelib_TypeDescriptionReference * type,
+    uno_ReleaseFunc release)
+    SAL_THROW_EXTERN_C()
+{
+    idestroySequence(sequence, type, nullptr, release);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */