1 files changed, 382 insertions, 0 deletions
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: */