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

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

17 files changed, 5235 insertions, 0 deletions

diff --git a/io/source/TextInputStream/TextInputStream.cxx b/io/source/TextInputStream/TextInputStream.cxx
new file mode 100644
index 000000000..9f7c88472
--- /dev/null
+++ b/io/source/TextInputStream/TextInputStream.cxx
@@ -0,0 +1,399 @@
+/* -*- 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 <string.h>
+
+#include <comphelper/sequence.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+#include <rtl/textenc.h>
+#include <rtl/tencinfo.h>
+
+#include <com/sun/star/io/BufferSizeExceededException.hpp>
+#include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XTextInputStream2.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+
+#include <vector>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::io;
+
+
+// Implementation XTextInputStream
+
+#define INITIAL_UNICODE_BUFFER_CAPACITY     0x100
+#define READ_BYTE_COUNT                     0x100
+
+namespace {
+
+class OTextInputStream : public WeakImplHelper< XTextInputStream2, XServiceInfo >
+{
+    Reference< XInputStream > mxStream;
+
+    // Encoding
+    bool mbEncodingInitialized;
+    rtl_TextToUnicodeConverter  mConvText2Unicode;
+    rtl_TextToUnicodeContext    mContextText2Unicode;
+    Sequence<sal_Int8>          mSeqSource;
+
+    // Internal buffer for characters that are already converted successfully
+    std::vector<sal_Unicode> mvBuffer;
+    sal_Int32 mnCharsInBuffer;
+    bool mbReachedEOF;
+
+    /// @throws IOException
+    /// @throws RuntimeException
+    OUString implReadString( const Sequence< sal_Unicode >& Delimiters,
+        bool bRemoveDelimiter, bool bFindLineEnd );
+    /// @throws IOException
+    /// @throws RuntimeException
+    sal_Int32 implReadNext();
+
+public:
+    OTextInputStream();
+    virtual ~OTextInputStream() override;
+
+    // Methods XTextInputStream
+    virtual OUString SAL_CALL readLine(  ) override;
+    virtual OUString SAL_CALL readString( const Sequence< sal_Unicode >& Delimiters, sal_Bool bRemoveDelimiter ) override;
+    virtual sal_Bool SAL_CALL isEOF(  ) override;
+    virtual void SAL_CALL setEncoding( const OUString& Encoding ) override;
+
+    // Methods XInputStream
+    virtual sal_Int32 SAL_CALL readBytes( Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead ) override;
+    virtual sal_Int32 SAL_CALL readSomeBytes( Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead ) override;
+    virtual void SAL_CALL skipBytes( sal_Int32 nBytesToSkip ) override;
+    virtual sal_Int32 SAL_CALL available(  ) override;
+    virtual void SAL_CALL closeInput(  ) override;
+
+    // Methods XActiveDataSink
+    virtual void SAL_CALL setInputStream( const Reference< XInputStream >& aStream ) override;
+    virtual Reference< XInputStream > SAL_CALL getInputStream() override;
+
+    // Methods XServiceInfo
+        virtual OUString              SAL_CALL getImplementationName() override;
+        virtual Sequence< OUString >  SAL_CALL getSupportedServiceNames() override;
+        virtual sal_Bool              SAL_CALL supportsService(const OUString& ServiceName) override;
+};
+
+}
+
+OTextInputStream::OTextInputStream()
+    : mbEncodingInitialized(false)
+    , mConvText2Unicode(nullptr)
+    , mContextText2Unicode(nullptr)
+    , mSeqSource(READ_BYTE_COUNT)
+    , mvBuffer(INITIAL_UNICODE_BUFFER_CAPACITY, 0)
+    , mnCharsInBuffer(0)
+    , mbReachedEOF(false)
+{
+}
+
+OTextInputStream::~OTextInputStream()
+{
+    if( mbEncodingInitialized )
+    {
+        rtl_destroyTextToUnicodeContext( mConvText2Unicode, mContextText2Unicode );
+        rtl_destroyTextToUnicodeConverter( mConvText2Unicode );
+    }
+}
+
+
+// XTextInputStream
+
+OUString OTextInputStream::readLine(  )
+{
+    static Sequence< sal_Unicode > aDummySeq;
+    return implReadString( aDummySeq, true, true );
+}
+
+OUString OTextInputStream::readString( const Sequence< sal_Unicode >& Delimiters, sal_Bool bRemoveDelimiter )
+{
+    return implReadString( Delimiters, bRemoveDelimiter, false );
+}
+
+sal_Bool OTextInputStream::isEOF()
+{
+    bool bRet = false;
+    if( mnCharsInBuffer == 0 && mbReachedEOF )
+        bRet = true;
+    return bRet;
+}
+
+
+OUString OTextInputStream::implReadString( const Sequence< sal_Unicode >& Delimiters,
+                                           bool bRemoveDelimiter, bool bFindLineEnd )
+{
+    OUString aRetStr;
+    if( !mbEncodingInitialized )
+    {
+        setEncoding( "utf8" );
+    }
+    if( !mbEncodingInitialized )
+        return aRetStr;
+
+    // Only for bFindLineEnd
+    sal_Unicode cLineEndChar1 = 0x0D;
+    sal_Unicode cLineEndChar2 = 0x0A;
+
+    sal_Int32 nBufferReadPos = 0;
+    sal_Int32 nCopyLen = 0;
+    bool bFound = false;
+    bool bFoundFirstLineEndChar = false;
+    sal_Unicode cFirstLineEndChar = 0;
+    while( !bFound )
+    {
+        // Still characters available?
+        if( nBufferReadPos == mnCharsInBuffer )
+        {
+            // Already reached EOF? Then we can't read any more
+            if( mbReachedEOF )
+                break;
+
+            // No, so read new characters
+            if( !implReadNext() )
+                break;
+        }
+
+        // Now there should be characters available
+        // (otherwise the loop should have been broken before)
+        sal_Unicode c = mvBuffer[ nBufferReadPos++ ];
+
+        if( bFindLineEnd )
+        {
+            if( bFoundFirstLineEndChar )
+            {
+                bFound = true;
+                nCopyLen = nBufferReadPos - 2;
+                if( c == cLineEndChar1 || c == cLineEndChar2 )
+                {
+                    // Same line end char -> new line break
+                    if( c == cFirstLineEndChar )
+                    {
+                        nBufferReadPos--;
+                    }
+                }
+                else
+                {
+                    // No second line end char
+                    nBufferReadPos--;
+                }
+            }
+            else if( c == cLineEndChar1 || c == cLineEndChar2 )
+            {
+                bFoundFirstLineEndChar = true;
+                cFirstLineEndChar = c;
+            }
+        }
+        else if( comphelper::findValue(Delimiters, c) != -1 )
+        {
+            bFound = true;
+            nCopyLen = nBufferReadPos;
+            if( bRemoveDelimiter )
+                nCopyLen--;
+        }
+    }
+
+    // Nothing found? Return all
+    if( !nCopyLen && !bFound && mbReachedEOF )
+        nCopyLen = nBufferReadPos;
+
+    // Create string
+    if( nCopyLen )
+        aRetStr = OUString( mvBuffer.data(), nCopyLen );
+
+    // Copy rest of buffer
+    memmove( mvBuffer.data(), mvBuffer.data() + nBufferReadPos,
+        (mnCharsInBuffer - nBufferReadPos) * sizeof( sal_Unicode ) );
+    mnCharsInBuffer -= nBufferReadPos;
+
+    return aRetStr;
+}
+
+
+sal_Int32 OTextInputStream::implReadNext()
+{
+    sal_Int32 nFreeBufferSize = mvBuffer.size() - mnCharsInBuffer;
+    if( nFreeBufferSize < READ_BYTE_COUNT )
+        mvBuffer.resize(mvBuffer.size() * 2);
+    nFreeBufferSize = mvBuffer.size() - mnCharsInBuffer;
+
+    try
+    {
+        sal_Int32 nRead = mxStream->readSomeBytes( mSeqSource, READ_BYTE_COUNT );
+        sal_Int32 nTotalRead = nRead;
+        if( nRead == 0 )
+            mbReachedEOF = true;
+
+        // Try to convert
+        sal_uInt32 uiInfo;
+        sal_Size nSrcCvtBytes = 0;
+        sal_Size nTargetCount = 0;
+        sal_Size nSourceCount = 0;
+        while( true )
+        {
+            const sal_Int8 *pbSource = mSeqSource.getConstArray();
+
+            // All invalid characters are transformed to the unicode undefined char
+            nTargetCount += rtl_convertTextToUnicode(
+                                mConvText2Unicode,
+                                mContextText2Unicode,
+                                reinterpret_cast<const char*>(&( pbSource[nSourceCount] )),
+                                nTotalRead - nSourceCount,
+                                mvBuffer.data() + mnCharsInBuffer + nTargetCount,
+                                nFreeBufferSize - nTargetCount,
+                                RTL_TEXTTOUNICODE_FLAGS_UNDEFINED_DEFAULT   |
+                                RTL_TEXTTOUNICODE_FLAGS_MBUNDEFINED_DEFAULT |
+                                RTL_TEXTTOUNICODE_FLAGS_INVALID_DEFAULT,
+                                &uiInfo,
+                                &nSrcCvtBytes );
+            nSourceCount += nSrcCvtBytes;
+
+            bool bCont = false;
+            if( uiInfo & RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL )
+            {
+                mvBuffer.resize(mvBuffer.size() * 2);
+                bCont = true;
+            }
+
+            if( uiInfo & RTL_TEXTTOUNICODE_INFO_SRCBUFFERTOOSMALL )
+            {
+                // read next byte
+                static Sequence< sal_Int8 > aOneByteSeq( 1 );
+                nRead = mxStream->readSomeBytes( aOneByteSeq, 1 );
+                if( nRead == 0 )
+                {
+                    mbReachedEOF = true;
+                    break;
+                }
+
+                sal_Int32 nOldLen = mSeqSource.getLength();
+                nTotalRead++;
+                if( nTotalRead > nOldLen )
+                {
+                    mSeqSource.realloc( nTotalRead );
+                }
+                mSeqSource.getArray()[ nOldLen ] = aOneByteSeq.getConstArray()[ 0 ];
+                bCont = true;
+            }
+
+            if( bCont )
+                continue;
+            break;
+        }
+
+        mnCharsInBuffer += nTargetCount;
+        return nTargetCount;
+    }
+    catch( NotConnectedException& )
+    {
+        throw IOException("Not connected");
+        //throw IOException( L"OTextInputStream::implReadString failed" );
+    }
+    catch( BufferSizeExceededException& )
+    {
+        throw IOException("Buffer size exceeded");
+    }
+}
+
+void OTextInputStream::setEncoding( const OUString& Encoding )
+{
+    OString aOEncodingStr = OUStringToOString( Encoding, RTL_TEXTENCODING_ASCII_US );
+    rtl_TextEncoding encoding = rtl_getTextEncodingFromMimeCharset( aOEncodingStr.getStr() );
+    if( RTL_TEXTENCODING_DONTKNOW == encoding )
+        return;
+
+    mbEncodingInitialized = true;
+    mConvText2Unicode = rtl_createTextToUnicodeConverter( encoding );
+    mContextText2Unicode = rtl_createTextToUnicodeContext( mConvText2Unicode );
+}
+
+
+// XInputStream
+
+sal_Int32 OTextInputStream::readBytes( Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
+{
+    return mxStream->readBytes( aData, nBytesToRead );
+}
+
+sal_Int32 OTextInputStream::readSomeBytes( Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
+{
+    return mxStream->readSomeBytes( aData, nMaxBytesToRead );
+}
+
+void OTextInputStream::skipBytes( sal_Int32 nBytesToSkip )
+{
+    mxStream->skipBytes( nBytesToSkip );
+}
+
+sal_Int32 OTextInputStream::available(  )
+{
+    return mxStream->available();
+}
+
+void OTextInputStream::closeInput(  )
+{
+    mxStream->closeInput();
+}
+
+
+// XActiveDataSink
+
+void OTextInputStream::setInputStream( const Reference< XInputStream >& aStream )
+{
+    mxStream = aStream;
+}
+
+Reference< XInputStream > OTextInputStream::getInputStream()
+{
+    return mxStream;
+}
+
+OUString OTextInputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.TextInputStream";
+}
+
+sal_Bool OTextInputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+Sequence< OUString > OTextInputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.TextInputStream" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OTextInputStream_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OTextInputStream());
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/TextOutputStream/TextOutputStream.cxx b/io/source/TextOutputStream/TextOutputStream.cxx
new file mode 100644
index 000000000..1271c4d09
--- /dev/null
+++ b/io/source/TextOutputStream/TextOutputStream.cxx
@@ -0,0 +1,239 @@
+/* -*- 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 <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+#include <rtl/textenc.h>
+#include <rtl/tencinfo.h>
+
+#include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/io/XTextOutputStream2.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::io;
+
+// Implementation XTextOutputStream
+
+namespace {
+
+class OTextOutputStream : public WeakImplHelper< XTextOutputStream2, XServiceInfo >
+{
+    Reference< XOutputStream > mxStream;
+
+    // Encoding
+    bool mbEncodingInitialized;
+    rtl_UnicodeToTextConverter  mConvUnicode2Text;
+    rtl_UnicodeToTextContext    mContextUnicode2Text;
+
+    Sequence<sal_Int8> implConvert( const OUString& rSource );
+    /// @throws IOException
+    void checkOutputStream() const;
+
+public:
+    OTextOutputStream();
+    virtual ~OTextOutputStream() override;
+
+    // Methods XTextOutputStream
+    virtual void SAL_CALL writeString( const OUString& aString ) override;
+    virtual void SAL_CALL setEncoding( const OUString& Encoding ) override;
+
+    // Methods XOutputStream
+    virtual void SAL_CALL writeBytes( const Sequence< sal_Int8 >& aData ) override;
+    virtual void SAL_CALL flush(  ) override;
+    virtual void SAL_CALL closeOutput(  ) override;
+
+    // Methods XActiveDataSource
+    virtual void SAL_CALL setOutputStream( const Reference< XOutputStream >& aStream ) override;
+    virtual Reference< XOutputStream > SAL_CALL getOutputStream(  ) override;
+
+    // Methods XServiceInfo
+        virtual OUString              SAL_CALL getImplementationName() override;
+        virtual Sequence< OUString >  SAL_CALL getSupportedServiceNames() override;
+        virtual sal_Bool              SAL_CALL supportsService(const OUString& ServiceName) override;
+};
+
+}
+
+OTextOutputStream::OTextOutputStream()
+    : mbEncodingInitialized(false)
+    , mConvUnicode2Text(nullptr)
+    , mContextUnicode2Text(nullptr)
+{
+}
+
+OTextOutputStream::~OTextOutputStream()
+{
+    if( mbEncodingInitialized )
+    {
+        rtl_destroyUnicodeToTextContext( mConvUnicode2Text, mContextUnicode2Text );
+        rtl_destroyUnicodeToTextConverter( mConvUnicode2Text );
+    }
+}
+
+Sequence<sal_Int8> OTextOutputStream::implConvert( const OUString& rSource )
+{
+    const sal_Unicode *puSource = rSource.getStr();
+    sal_Int32 nSourceSize = rSource.getLength();
+
+    sal_Size nTargetCount = 0;
+    sal_Size nSourceCount = 0;
+
+    sal_uInt32 uiInfo;
+    sal_Size nSrcCvtChars;
+
+    // take nSourceSize * 3 as preference
+    // this is an upper boundary for converting to utf8,
+    // which most often used as the target.
+    sal_Int32 nSeqSize =  nSourceSize * 3;
+
+    Sequence<sal_Int8> seqText( nSeqSize );
+    char *pTarget = reinterpret_cast<char *>(seqText.getArray());
+    while( true )
+    {
+        nTargetCount += rtl_convertUnicodeToText(
+                                    mConvUnicode2Text,
+                                    mContextUnicode2Text,
+                                    &( puSource[nSourceCount] ),
+                                    nSourceSize - nSourceCount ,
+                                    &( pTarget[nTargetCount] ),
+                                    nSeqSize - nTargetCount,
+                                    RTL_UNICODETOTEXT_FLAGS_UNDEFINED_DEFAULT |
+                                    RTL_UNICODETOTEXT_FLAGS_INVALID_DEFAULT ,
+                                    &uiInfo,
+                                    &nSrcCvtChars);
+        nSourceCount += nSrcCvtChars;
+
+        if( uiInfo & RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL )
+        {
+            nSeqSize *= 2;
+            seqText.realloc( nSeqSize );  // double array size
+            pTarget = reinterpret_cast<char*>(seqText.getArray());
+            continue;
+        }
+        break;
+    }
+
+    // reduce the size of the buffer (fast, no copy necessary)
+    seqText.realloc( nTargetCount );
+    return seqText;
+}
+
+
+// XTextOutputStream
+
+void OTextOutputStream::writeString( const OUString& aString )
+{
+    checkOutputStream();
+    if( !mbEncodingInitialized )
+    {
+        setEncoding( "utf8" );
+    }
+    if( !mbEncodingInitialized )
+        return;
+
+    Sequence<sal_Int8> aByteSeq = implConvert( aString );
+    mxStream->writeBytes( aByteSeq );
+}
+
+void OTextOutputStream::setEncoding( const OUString& Encoding )
+{
+    OString aOEncodingStr = OUStringToOString( Encoding, RTL_TEXTENCODING_ASCII_US );
+    rtl_TextEncoding encoding = rtl_getTextEncodingFromMimeCharset( aOEncodingStr.getStr() );
+    if( RTL_TEXTENCODING_DONTKNOW == encoding )
+        return;
+
+    mbEncodingInitialized = true;
+    mConvUnicode2Text   = rtl_createUnicodeToTextConverter( encoding );
+    mContextUnicode2Text = rtl_createUnicodeToTextContext( mConvUnicode2Text );
+}
+
+
+// XOutputStream
+void OTextOutputStream::writeBytes( const Sequence< sal_Int8 >& aData )
+{
+    checkOutputStream();
+    mxStream->writeBytes( aData );
+}
+
+void OTextOutputStream::flush(  )
+{
+    checkOutputStream();
+    mxStream->flush();
+}
+
+void OTextOutputStream::closeOutput(  )
+{
+    checkOutputStream();
+    mxStream->closeOutput();
+}
+
+
+void OTextOutputStream::checkOutputStream() const
+{
+    if (! mxStream.is() )
+        throw IOException("output stream is not initialized, you have to use setOutputStream first");
+}
+
+
+// XActiveDataSource
+
+void OTextOutputStream::setOutputStream( const Reference< XOutputStream >& aStream )
+{
+    mxStream = aStream;
+}
+
+Reference< XOutputStream > OTextOutputStream::getOutputStream()
+{
+    return mxStream;
+}
+
+OUString OTextOutputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.TextOutputStream";
+}
+
+sal_Bool OTextOutputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+Sequence< OUString > OTextOutputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.TextOutputStream" };
+}
+
+
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OTextOutputStream_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OTextOutputStream());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/acceptor/acc_pipe.cxx b/io/source/acceptor/acc_pipe.cxx
new file mode 100644
index 000000000..db43c58db
--- /dev/null
+++ b/io/source/acceptor/acc_pipe.cxx
@@ -0,0 +1,190 @@
+/* -*- 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/security.hxx>
+#include "acceptor.hxx"
+#include <com/sun/star/connection/XConnection.hpp>
+#include <com/sun/star/connection/ConnectionSetupException.hpp>
+#include <com/sun/star/io/IOException.hpp>
+
+#include <osl/diagnose.h>
+#include <cppuhelper/implbase.hxx>
+#include <rtl/ref.hxx>
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::connection;
+using namespace ::com::sun::star::io;
+
+
+namespace io_acceptor
+{
+    namespace {
+
+    class PipeConnection :
+        public WeakImplHelper< XConnection >
+    {
+    public:
+        explicit PipeConnection( const OUString &sConnectionDescription);
+
+        virtual sal_Int32 SAL_CALL read( Sequence< sal_Int8 >& aReadBytes, sal_Int32 nBytesToRead ) override;
+        virtual void SAL_CALL write( const Sequence< sal_Int8 >& aData ) override;
+        virtual void SAL_CALL flush(  ) override;
+        virtual void SAL_CALL close(  ) override;
+        virtual OUString SAL_CALL getDescription(  ) override;
+    public:
+        ::osl::StreamPipe m_pipe;
+        oslInterlockedCount m_nStatus;
+        OUString m_sDescription;
+    };
+
+    }
+
+    PipeConnection::PipeConnection( const OUString &sConnectionDescription) :
+        m_nStatus( 0 ),
+        m_sDescription( sConnectionDescription )
+    {
+        // make it unique
+        m_sDescription += ",uniqueValue=";
+        m_sDescription += OUString::number(
+            sal::static_int_cast<sal_Int64 >(
+                reinterpret_cast< sal_IntPtr >(&m_pipe)) );
+    }
+
+    sal_Int32 PipeConnection::read( Sequence < sal_Int8 > & aReadBytes , sal_Int32 nBytesToRead )
+    {
+        if( m_nStatus )
+        {
+            throw IOException("pipe already closed");
+        }
+        if( aReadBytes.getLength() < nBytesToRead )
+        {
+            aReadBytes.realloc( nBytesToRead );
+        }
+        sal_Int32 n = m_pipe.read( aReadBytes.getArray(), nBytesToRead );
+        OSL_ASSERT( n >= 0 && n <= aReadBytes.getLength() );
+        if( n < aReadBytes.getLength() )
+        {
+            aReadBytes.realloc( n );
+        }
+        return n;
+
+    }
+
+    void PipeConnection::write( const Sequence < sal_Int8 > &seq )
+    {
+        if( m_nStatus )
+        {
+            throw IOException("pipe already closed");
+        }
+        if( m_pipe.write( seq.getConstArray() , seq.getLength() ) != seq.getLength() )
+        {
+            throw IOException("short write");
+        }
+    }
+
+    void PipeConnection::flush( )
+    {
+    }
+
+    void PipeConnection::close()
+    {
+        if(  1 == osl_atomic_increment( (&m_nStatus) ) )
+        {
+            m_pipe.close();
+        }
+    }
+
+    OUString PipeConnection::getDescription()
+    {
+        return m_sDescription;
+    }
+
+    /***************
+     * PipeAcceptor
+     **************/
+    PipeAcceptor::PipeAcceptor( const OUString &sPipeName , const OUString & sConnectionDescription) :
+        m_sPipeName( sPipeName ),
+        m_sConnectionDescription( sConnectionDescription ),
+        m_bClosed( false )
+    {
+    }
+
+
+    void PipeAcceptor::init()
+    {
+        m_pipe = Pipe( m_sPipeName.pData , osl_Pipe_CREATE , osl::Security() );
+        if( ! m_pipe.is() )
+        {
+            OUString error = "io.acceptor: Couldn't setup pipe " + m_sPipeName;
+            throw ConnectionSetupException( error );
+        }
+    }
+
+    Reference< XConnection > PipeAcceptor::accept( )
+    {
+        Pipe pipe;
+        {
+            std::unique_lock guard( m_mutex );
+            pipe = m_pipe;
+        }
+        if( ! pipe.is() )
+        {
+            OUString error = "io.acceptor: pipe already closed" + m_sPipeName;
+            throw ConnectionSetupException( error );
+        }
+        rtl::Reference<PipeConnection> pConn(new PipeConnection( m_sConnectionDescription ));
+
+        oslPipeError status = pipe.accept( pConn->m_pipe );
+
+        if( m_bClosed )
+        {
+            // stopAccepting was called !
+            return Reference < XConnection >();
+        }
+        else if( osl_Pipe_E_None == status )
+        {
+            return pConn;
+        }
+        else
+        {
+            OUString error = "io.acceptor: Couldn't setup pipe " + m_sPipeName;
+            throw ConnectionSetupException( error );
+        }
+    }
+
+    void PipeAcceptor::stopAccepting()
+    {
+        m_bClosed = true;
+        Pipe pipe;
+        {
+            std::unique_lock guard( m_mutex );
+            pipe = m_pipe;
+            m_pipe.clear();
+        }
+        if( pipe.is() )
+        {
+            pipe.close();
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/acceptor/acc_socket.cxx b/io/source/acceptor/acc_socket.cxx
new file mode 100644
index 000000000..d52fdc423
--- /dev/null
+++ b/io/source/acceptor/acc_socket.cxx
@@ -0,0 +1,349 @@
+/* -*- 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 "acceptor.hxx"
+
+#include <unordered_set>
+
+#include <mutex>
+#include <rtl/ref.hxx>
+#include <com/sun/star/connection/XConnection.hpp>
+#include <com/sun/star/connection/XConnectionBroadcaster.hpp>
+#include <com/sun/star/connection/ConnectionSetupException.hpp>
+#include <com/sun/star/io/IOException.hpp>
+#include <cppuhelper/implbase.hxx>
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::connection;
+
+
+namespace io_acceptor {
+
+    typedef std::unordered_set< css::uno::Reference< css::io::XStreamListener> >
+            XStreamListener_hash_set;
+
+    namespace {
+
+    class SocketConnection : public ::cppu::WeakImplHelper<
+        css::connection::XConnection,
+        css::connection::XConnectionBroadcaster>
+
+    {
+    public:
+        explicit SocketConnection( const OUString & sConnectionDescription );
+
+        virtual sal_Int32 SAL_CALL read( css::uno::Sequence< sal_Int8 >& aReadBytes,
+                                         sal_Int32 nBytesToRead ) override;
+        virtual void SAL_CALL write( const css::uno::Sequence< sal_Int8 >& aData ) override;
+        virtual void SAL_CALL flush(  ) override;
+        virtual void SAL_CALL close(  ) override;
+        virtual OUString SAL_CALL getDescription(  ) override;
+
+        // XConnectionBroadcaster
+        virtual void SAL_CALL addStreamListener(const css::uno::Reference< css::io::XStreamListener>& aListener) override;
+        virtual void SAL_CALL removeStreamListener(const css::uno::Reference< css::io::XStreamListener>& aListener) override;
+
+    public:
+        void completeConnectionString();
+
+        ::osl::StreamSocket m_socket;
+        oslInterlockedCount m_nStatus;
+        OUString m_sDescription;
+
+        std::mutex _mutex;
+        bool     _started;
+        bool     _closed;
+        bool     _error;
+        XStreamListener_hash_set _listeners;
+    };
+
+    }
+
+    template<class T>
+    static void notifyListeners(SocketConnection * pCon, bool * notified, T t)
+    {
+        XStreamListener_hash_set listeners;
+
+        {
+            std::unique_lock guard(pCon->_mutex);
+            if(!*notified)
+            {
+                *notified = true;
+                listeners = pCon->_listeners;
+            }
+        }
+
+        for(auto& listener : listeners)
+            t(listener);
+    }
+
+    static void callStarted(const Reference<XStreamListener>& xStreamListener)
+    {
+        xStreamListener->started();
+    }
+
+    namespace {
+
+    struct callError {
+        const Any & any;
+
+        explicit callError(const Any & any);
+
+        void operator () (const Reference<XStreamListener>& xStreamListener);
+    };
+
+    }
+
+    callError::callError(const Any & aAny)
+        : any(aAny)
+    {
+    }
+
+    void callError::operator () (const Reference<XStreamListener>& xStreamListener)
+    {
+        xStreamListener->error(any);
+    }
+
+    static void callClosed(const Reference<XStreamListener>& xStreamListener)
+    {
+        xStreamListener->closed();
+    }
+
+
+    SocketConnection::SocketConnection( const OUString &sConnectionDescription) :
+        m_nStatus( 0 ),
+        m_sDescription( sConnectionDescription ),
+        _started(false),
+        _closed(false),
+        _error(false)
+    {
+        // make it unique
+        m_sDescription += ",uniqueValue=" ;
+        m_sDescription += OUString::number(
+            sal::static_int_cast< sal_Int64 >(
+                reinterpret_cast< sal_IntPtr >(&m_socket)) );
+    }
+
+    void SocketConnection::completeConnectionString()
+    {
+        m_sDescription +=
+            ",peerPort=" + OUString::number(m_socket.getPeerPort()) +
+            ",peerHost=" + m_socket.getPeerHost( ) +
+            ",localPort=" + OUString::number( m_socket.getLocalPort() ) +
+            ",localHost=" + m_socket.getLocalHost();
+    }
+
+    sal_Int32 SocketConnection::read( Sequence < sal_Int8 > & aReadBytes , sal_Int32 nBytesToRead )
+    {
+        if( ! m_nStatus )
+        {
+            notifyListeners(this, &_started, callStarted);
+
+            if( aReadBytes.getLength() != nBytesToRead )
+            {
+                aReadBytes.realloc( nBytesToRead );
+            }
+
+            sal_Int32 i = m_socket.read(
+                aReadBytes.getArray(), aReadBytes.getLength());
+
+            if(i != nBytesToRead)
+            {
+                OUString message = "acc_socket.cxx:SocketConnection::read: error - " +
+                    m_socket.getErrorAsString();
+
+                IOException ioException(message, static_cast<XConnection *>(this));
+
+                Any any;
+                any <<= ioException;
+
+                notifyListeners(this, &_error, callError(any));
+
+                throw ioException;
+            }
+
+            return i;
+        }
+        else
+        {
+            IOException ioException("acc_socket.cxx:SocketConnection::read: error - connection already closed", static_cast<XConnection *>(this));
+
+            Any any;
+            any <<= ioException;
+
+            notifyListeners(this, &_error, callError(any));
+
+            throw ioException;
+        }
+    }
+
+    void SocketConnection::write( const Sequence < sal_Int8 > &seq )
+    {
+        if( ! m_nStatus )
+        {
+            if( m_socket.write( seq.getConstArray() , seq.getLength() ) != seq.getLength() )
+            {
+                OUString message = "acc_socket.cxx:SocketConnection::write: error - " +
+                    m_socket.getErrorAsString();
+
+                IOException ioException(message, static_cast<XConnection *>(this));
+
+                Any any;
+                any <<= ioException;
+
+                notifyListeners(this, &_error, callError(any));
+
+                throw ioException;
+            }
+        }
+        else
+        {
+            IOException ioException("acc_socket.cxx:SocketConnection::write: error - connection already closed", static_cast<XConnection *>(this));
+
+            Any any;
+            any <<= ioException;
+
+            notifyListeners(this, &_error, callError(any));
+
+            throw ioException;
+        }
+    }
+
+    void SocketConnection::flush( )
+    {
+
+    }
+
+    void SocketConnection::close()
+    {
+        // ensure close is called only once
+        if(  1 == osl_atomic_increment( (&m_nStatus) ) )
+        {
+            m_socket.shutdown();
+            notifyListeners(this, &_closed, callClosed);
+        }
+    }
+
+    OUString SocketConnection::getDescription()
+    {
+        return m_sDescription;
+    }
+
+
+    // XConnectionBroadcaster
+    void SAL_CALL SocketConnection::addStreamListener(const Reference<XStreamListener> & aListener)
+    {
+        std::unique_lock guard(_mutex);
+
+        _listeners.insert(aListener);
+    }
+
+    void SAL_CALL SocketConnection::removeStreamListener(const Reference<XStreamListener> & aListener)
+    {
+        std::unique_lock guard(_mutex);
+
+        _listeners.erase(aListener);
+    }
+
+    SocketAcceptor::SocketAcceptor( const OUString &sSocketName,
+                                    sal_uInt16 nPort,
+                                    bool bTcpNoDelay,
+                                    const OUString &sConnectionDescription) :
+        m_sSocketName( sSocketName ),
+        m_sConnectionDescription( sConnectionDescription ),
+        m_nPort( nPort ),
+        m_bTcpNoDelay( bTcpNoDelay ),
+        m_bClosed( false )
+    {
+    }
+
+
+    void SocketAcceptor::init()
+    {
+        if( ! m_addr.setPort( m_nPort ) )
+        {
+            throw ConnectionSetupException(
+                "acc_socket.cxx:SocketAcceptor::init - error - invalid tcp/ip port " +
+                OUString::number( m_nPort ));
+        }
+        if( ! m_addr.setHostname( m_sSocketName.pData ) )
+        {
+            throw ConnectionSetupException(
+                "acc_socket.cxx:SocketAcceptor::init - error - invalid host " + m_sSocketName );
+        }
+        m_socket.setOption( osl_Socket_OptionReuseAddr, 1);
+
+        if(! m_socket.bind(m_addr) )
+        {
+            throw ConnectionSetupException(
+                "acc_socket.cxx:SocketAcceptor::init - error - couldn't bind on " +
+                m_sSocketName + ":" + OUString::number(m_nPort));
+        }
+
+        if(! m_socket.listen() )
+        {
+            throw ConnectionSetupException(
+                "acc_socket.cxx:SocketAcceptor::init - error - can't listen on " +
+                m_sSocketName  + ":" + OUString::number(m_nPort) );
+        }
+    }
+
+    Reference< XConnection > SocketAcceptor::accept( )
+    {
+        rtl::Reference<SocketConnection> pConn(new SocketConnection( m_sConnectionDescription ));
+
+        if( m_socket.acceptConnection( pConn->m_socket )!= osl_Socket_Ok )
+        {
+            // stopAccepting was called
+            return Reference < XConnection > ();
+        }
+        if( m_bClosed )
+        {
+            return Reference < XConnection > ();
+        }
+
+        pConn->completeConnectionString();
+        ::osl::SocketAddr remoteAddr;
+        pConn->m_socket.getPeerAddr(remoteAddr);
+        OUString remoteHostname = remoteAddr.getHostname();
+        // we enable tcpNoDelay for loopback connections because
+        // it can make a significant speed difference on linux boxes.
+        if( m_bTcpNoDelay || remoteHostname == "localhost" ||
+            remoteHostname.startsWith("127.0.0.") )
+        {
+            sal_Int32 nTcpNoDelay = sal_Int32(true);
+            pConn->m_socket.setOption( osl_Socket_OptionTcpNoDelay , &nTcpNoDelay,
+                                       sizeof( nTcpNoDelay ) , osl_Socket_LevelTcp );
+        }
+
+        return pConn;
+    }
+
+    void SocketAcceptor::stopAccepting()
+    {
+        m_bClosed = true;
+        m_socket.close();
+    }
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/acceptor/acceptor.cxx b/io/source/acceptor/acceptor.cxx
new file mode 100644
index 000000000..af0883be9
--- /dev/null
+++ b/io/source/acceptor/acceptor.cxx
@@ -0,0 +1,253 @@
+/* -*- 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 <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <cppuhelper/unourl.hxx>
+#include <rtl/malformeduriexception.hxx>
+
+#include <com/sun/star/connection/AlreadyAcceptingException.hpp>
+#include <com/sun/star/connection/ConnectionSetupException.hpp>
+#include <com/sun/star/connection/XAcceptor.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include "acceptor.hxx"
+#include <memory>
+#include <mutex>
+#include <string_view>
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::connection;
+
+namespace {
+
+    class OAcceptor : public WeakImplHelper< XAcceptor, XServiceInfo >
+    {
+    public:
+        explicit OAcceptor(const Reference< XComponentContext > & xCtx);
+        virtual ~OAcceptor() override;
+    public:
+        // Methods
+        virtual Reference< XConnection > SAL_CALL accept( const OUString& sConnectionDescription ) override;
+        virtual void SAL_CALL stopAccepting(  ) override;
+
+    public: // XServiceInfo
+                virtual OUString              SAL_CALL getImplementationName() override;
+                virtual Sequence< OUString >  SAL_CALL getSupportedServiceNames() override;
+                virtual sal_Bool              SAL_CALL supportsService(const OUString& ServiceName) override;
+
+    private:
+        std::unique_ptr<io_acceptor::PipeAcceptor> m_pPipe;
+        std::unique_ptr<io_acceptor::SocketAcceptor> m_pSocket;
+        std::mutex m_mutex;
+        OUString m_sLastDescription;
+        bool m_bInAccept;
+
+        Reference< XMultiComponentFactory > _xSMgr;
+        Reference< XComponentContext > _xCtx;
+        Reference<XAcceptor>         _xAcceptor;
+    };
+
+}
+
+OAcceptor::OAcceptor( const Reference< XComponentContext > & xCtx )
+    : m_bInAccept( false )
+    , _xSMgr( xCtx->getServiceManager() )
+    , _xCtx( xCtx )
+{}
+
+OAcceptor::~OAcceptor()
+{
+    m_pPipe.reset();
+}
+
+namespace {
+struct BeingInAccept
+{
+    /// @throws AlreadyAcceptingException
+    BeingInAccept( bool *pFlag,std::u16string_view sConnectionDescription  )
+        : m_pFlag( pFlag )
+        {
+              if( *m_pFlag )
+                  throw AlreadyAcceptingException( OUString::Concat("AlreadyAcceptingException :") + sConnectionDescription );
+              *m_pFlag = true;
+        }
+    ~BeingInAccept()
+        {
+            *m_pFlag = false;
+        }
+    bool *m_pFlag;
+};
+}
+
+Reference< XConnection > OAcceptor::accept( const OUString &sConnectionDescription )
+{
+    // if there is a thread already accepting in this object, throw an exception.
+    struct BeingInAccept guard( &m_bInAccept, sConnectionDescription );
+
+    Reference< XConnection > r;
+    if( !m_sLastDescription.isEmpty() &&
+        m_sLastDescription != sConnectionDescription )
+    {
+        // instantiate another acceptor for different ports
+        throw ConnectionSetupException( "acceptor::accept called multiple times with different connection strings\n" );
+    }
+
+    if( m_sLastDescription.isEmpty() )
+    {
+        // setup the acceptor
+        try
+        {
+            cppu::UnoUrlDescriptor aDesc(sConnectionDescription);
+            if ( aDesc.getName() == "pipe" )
+            {
+                OUString aName(
+                    aDesc.getParameter(
+                        "name"));
+
+                m_pPipe.reset(new io_acceptor::PipeAcceptor(aName, sConnectionDescription));
+
+                try
+                {
+                    m_pPipe->init();
+                }
+                catch( ... )
+                {
+                    {
+                        std::unique_lock g( m_mutex );
+                        m_pPipe.reset();
+                    }
+                    throw;
+                }
+            }
+            else if ( aDesc.getName() == "socket" )
+            {
+                OUString aHost;
+                if (aDesc.hasParameter(
+                        "host"))
+                    aHost = aDesc.getParameter(
+                        "host");
+                else
+                    aHost = "localhost";
+                sal_uInt16 nPort = static_cast< sal_uInt16 >(
+                    aDesc.getParameter(
+                        "port").
+                    toInt32());
+                bool bTcpNoDelay
+                    = aDesc.getParameter(
+                        "tcpnodelay").toInt32() != 0;
+
+                m_pSocket.reset(new io_acceptor::SocketAcceptor(
+                    aHost, nPort, bTcpNoDelay, sConnectionDescription));
+
+                try
+                {
+                    m_pSocket->init();
+                }
+                catch( ... )
+                {
+                    {
+                        std::unique_lock g( m_mutex );
+                        m_pSocket.reset();
+                    }
+                    throw;
+                }
+            }
+            else
+            {
+                OUString delegatee = "com.sun.star.connection.Acceptor." + aDesc.getName();
+                _xAcceptor.set(_xSMgr->createInstanceWithContext(delegatee, _xCtx), UNO_QUERY);
+
+                if(!_xAcceptor.is())
+                    throw ConnectionSetupException("Acceptor: unknown delegatee " + delegatee);
+            }
+        }
+        catch (const rtl::MalformedUriException & rEx)
+        {
+            throw IllegalArgumentException(
+                rEx.getMessage(),
+                Reference< XInterface > (),
+                0 );
+        }
+        m_sLastDescription = sConnectionDescription;
+    }
+
+    if( m_pPipe )
+    {
+        r = m_pPipe->accept();
+    }
+    else if( m_pSocket )
+    {
+        r = m_pSocket->accept();
+    }
+    else
+    {
+        r = _xAcceptor->accept(sConnectionDescription);
+    }
+
+    return r;
+}
+
+void SAL_CALL OAcceptor::stopAccepting(  )
+{
+    std::unique_lock guard( m_mutex );
+
+    if( m_pPipe )
+    {
+        m_pPipe->stopAccepting();
+    }
+    else if ( m_pSocket )
+    {
+        m_pSocket->stopAccepting();
+    }
+    else if( _xAcceptor.is() )
+    {
+        _xAcceptor->stopAccepting();
+    }
+
+}
+
+OUString OAcceptor::getImplementationName()
+{
+    return "com.sun.star.comp.io.Acceptor";
+}
+
+sal_Bool OAcceptor::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+Sequence< OUString > OAcceptor::getSupportedServiceNames()
+{
+    return { "com.sun.star.connection.Acceptor" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OAcceptor_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OAcceptor(context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/acceptor/acceptor.hxx b/io/source/acceptor/acceptor.hxx
new file mode 100644
index 000000000..9214a10b7
--- /dev/null
+++ b/io/source/acceptor/acceptor.hxx
@@ -0,0 +1,74 @@
+/* -*- 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/pipe.hxx>
+#include <osl/socket.hxx>
+#include <mutex>
+
+#include <com/sun/star/uno/Reference.hxx>
+
+namespace com::sun::star::connection { class XConnection; }
+
+namespace io_acceptor {
+
+    class PipeAcceptor
+    {
+    public:
+        PipeAcceptor( const OUString &sPipeName , const OUString &sConnectionDescription );
+
+        void init();
+        css::uno::Reference < css::connection::XConnection >  accept(  );
+
+        void stopAccepting();
+
+        std::mutex m_mutex;
+        ::osl::Pipe m_pipe;
+        OUString m_sPipeName;
+        OUString m_sConnectionDescription;
+        bool m_bClosed;
+    };
+
+    class SocketAcceptor
+    {
+    public:
+        SocketAcceptor( const OUString & sSocketName ,
+                        sal_uInt16 nPort,
+                        bool bTcpNoDelay,
+                        const OUString &sConnectionDescription );
+
+        void init();
+        css::uno::Reference < css::connection::XConnection > accept();
+
+        void stopAccepting();
+
+        ::osl::SocketAddr m_addr;
+        ::osl::AcceptorSocket m_socket;
+        OUString m_sSocketName;
+        OUString m_sConnectionDescription;
+        sal_uInt16 m_nPort;
+        bool m_bTcpNoDelay;
+        bool m_bClosed;
+    };
+
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/connector/connector.cxx b/io/source/connector/connector.cxx
new file mode 100644
index 000000000..15720b242
--- /dev/null
+++ b/io/source/connector/connector.cxx
@@ -0,0 +1,178 @@
+/* -*- 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/security.hxx>
+#include <sal/log.hxx>
+
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <cppuhelper/unourl.hxx>
+#include <rtl/malformeduriexception.hxx>
+#include <rtl/ref.hxx>
+#include <o3tl/string_view.hxx>
+
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/connection/ConnectionSetupException.hpp>
+#include <com/sun/star/connection/NoConnectException.hpp>
+#include <com/sun/star/connection/XConnector.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include "connector.hxx"
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::connection;
+
+namespace {
+
+    class OConnector : public WeakImplHelper< XConnector, XServiceInfo >
+    {
+        Reference< XMultiComponentFactory > _xSMgr;
+        Reference< XComponentContext > _xCtx;
+    public:
+        explicit OConnector(const Reference< XComponentContext > &xCtx);
+
+        // Methods
+        virtual Reference< XConnection > SAL_CALL connect(
+            const OUString& sConnectionDescription ) override;
+
+    public: // XServiceInfo
+                virtual OUString              SAL_CALL getImplementationName() override;
+                virtual Sequence< OUString >  SAL_CALL getSupportedServiceNames() override;
+                virtual sal_Bool              SAL_CALL supportsService(const OUString& ServiceName) override;
+    };
+
+}
+
+OConnector::OConnector(const Reference< XComponentContext > &xCtx)
+    : _xSMgr( xCtx->getServiceManager() )
+    , _xCtx( xCtx )
+{}
+
+Reference< XConnection > SAL_CALL OConnector::connect( const OUString& sConnectionDescription )
+{
+    // split string into tokens
+    try
+    {
+        cppu::UnoUrlDescriptor aDesc(sConnectionDescription);
+
+        Reference< XConnection > r;
+        if ( aDesc.getName() == "pipe" )
+        {
+            OUString aName(aDesc.getParameter("name"));
+
+            rtl::Reference<stoc_connector::PipeConnection> pConn(new stoc_connector::PipeConnection( sConnectionDescription ));
+
+            if( pConn->m_pipe.create( aName.pData, osl_Pipe_OPEN, osl::Security() ) )
+            {
+                r = pConn;
+            }
+            else
+            {
+                OUString const sMessage(
+                    "Connector : couldn't connect to pipe \"" + aName + "\": "
+                    + OUString::number(pConn->m_pipe.getError()));
+                SAL_WARN("io.connector", sMessage);
+                throw NoConnectException( sMessage );
+            }
+        }
+        else if ( aDesc.getName() == "socket" )
+        {
+            OUString aHost;
+            if (aDesc.hasParameter("host"))
+                aHost = aDesc.getParameter("host");
+            else
+                aHost = "localhost";
+            sal_uInt16 nPort = static_cast< sal_uInt16 >(
+                aDesc.getParameter("port").
+                toInt32());
+            bool bTcpNoDelay
+                = aDesc.getParameter("tcpnodelay").toInt32() != 0;
+
+            rtl::Reference<stoc_connector::SocketConnection> pConn(new stoc_connector::SocketConnection( sConnectionDescription));
+
+            SocketAddr AddrTarget( aHost.pData, nPort );
+            if(pConn->m_socket.connect(AddrTarget) != osl_Socket_Ok)
+            {
+                OUString sMessage("Connector : couldn't connect to socket (");
+                OUString sError = pConn->m_socket.getErrorAsString();
+                sMessage += sError + ")";
+                throw NoConnectException( sMessage );
+            }
+            // we enable tcpNoDelay for loopback connections because
+            // it can make a significant speed difference on linux boxes.
+            if( bTcpNoDelay || aHost == "localhost" || aHost.startsWith("127.0.0.") )
+            {
+                sal_Int32 nTcpNoDelay = sal_Int32(true);
+                pConn->m_socket.setOption( osl_Socket_OptionTcpNoDelay , &nTcpNoDelay,
+                                           sizeof( nTcpNoDelay ) , osl_Socket_LevelTcp );
+            }
+            pConn->completeConnectionString();
+            r = pConn;
+        }
+        else
+        {
+            OUString delegatee= "com.sun.star.connection.Connector." + aDesc.getName();
+
+            Reference<XConnector> xConnector(
+                _xSMgr->createInstanceWithContext(delegatee, _xCtx), UNO_QUERY );
+
+            if(!xConnector.is())
+                throw ConnectionSetupException("Connector: unknown delegatee " + delegatee);
+
+            sal_Int32 index = sConnectionDescription.indexOf(',');
+
+            r = xConnector->connect(OUString(o3tl::trim(sConnectionDescription.subView(index + 1))));
+        }
+        return r;
+    }
+    catch (const rtl::MalformedUriException & rEx)
+    {
+        throw ConnectionSetupException(rEx.getMessage());
+    }
+}
+
+OUString OConnector::getImplementationName()
+{
+    return "com.sun.star.comp.io.Connector";
+}
+
+sal_Bool OConnector::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+Sequence< OUString > OConnector::getSupportedServiceNames()
+{
+    return { "com.sun.star.connection.Connector" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OConnector_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OConnector(context));
+}
+
+
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/connector/connector.hxx b/io/source/connector/connector.hxx
new file mode 100644
index 000000000..691fc7a88
--- /dev/null
+++ b/io/source/connector/connector.hxx
@@ -0,0 +1,94 @@
+/* -*- 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 <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/connection/XConnection.hpp>
+#include <com/sun/star/connection/XConnectionBroadcaster.hpp>
+
+#include <unordered_set>
+#include <osl/socket.hxx>
+#include <osl/pipe.hxx>
+#include <mutex>
+
+namespace stoc_connector
+{
+    typedef std::unordered_set< css::uno::Reference< css::io::XStreamListener> >
+            XStreamListener_hash_set;
+
+    class PipeConnection :
+        public ::cppu::WeakImplHelper< css::connection::XConnection >
+
+    {
+    public:
+        explicit PipeConnection( const OUString &sConnectionDescription );
+        virtual ~PipeConnection() override;
+
+        virtual sal_Int32 SAL_CALL read( css::uno::Sequence< sal_Int8 >& aReadBytes,
+                                         sal_Int32 nBytesToRead ) override;
+        virtual void SAL_CALL write( const css::uno::Sequence< sal_Int8 >& aData ) override;
+        virtual void SAL_CALL flush(  ) override;
+        virtual void SAL_CALL close(  ) override;
+        virtual OUString SAL_CALL getDescription(  ) override;
+    public:
+        ::osl::StreamPipe m_pipe;
+        oslInterlockedCount m_nStatus;
+        OUString m_sDescription;
+    };
+
+    class SocketConnection :
+        public ::cppu::WeakImplHelper< css::connection::XConnection, css::connection::XConnectionBroadcaster >
+
+    {
+    public:
+        explicit SocketConnection( const OUString & sConnectionDescription  );
+        virtual ~SocketConnection() override;
+
+        virtual sal_Int32 SAL_CALL read( css::uno::Sequence< sal_Int8 >& aReadBytes,
+                                         sal_Int32 nBytesToRead ) override;
+        virtual void SAL_CALL write( const css::uno::Sequence< sal_Int8 >& aData ) override;
+        virtual void SAL_CALL flush(  ) override;
+        virtual void SAL_CALL close(  ) override;
+        virtual OUString SAL_CALL getDescription(  ) override;
+
+
+        // XConnectionBroadcaster
+        virtual void SAL_CALL addStreamListener(const css::uno::Reference< css::io::XStreamListener>& aListener) override;
+        virtual void SAL_CALL removeStreamListener(const css::uno::Reference< css::io::XStreamListener>& aListener) override;
+
+    public:
+        void completeConnectionString();
+
+        ::osl::ConnectorSocket m_socket;
+        oslInterlockedCount m_nStatus;
+        OUString m_sDescription;
+
+        std::mutex _mutex;
+        bool     _started;
+        bool     _closed;
+        bool     _error;
+
+        XStreamListener_hash_set _listeners;
+    };
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/connector/ctr_pipe.cxx b/io/source/connector/ctr_pipe.cxx
new file mode 100644
index 000000000..5ee0b70bc
--- /dev/null
+++ b/io/source/connector/ctr_pipe.cxx
@@ -0,0 +1,97 @@
+/* -*- 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/io/IOException.hpp>
+
+#include "connector.hxx"
+#include <osl/pipe.hxx>
+
+using namespace ::osl;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::connection;
+
+
+namespace stoc_connector {
+
+    PipeConnection::PipeConnection( const OUString & sConnectionDescription ) :
+        m_nStatus( 0 ),
+        m_sDescription( sConnectionDescription )
+    {
+        // make it unique
+        m_sDescription += ",uniqueValue=";
+        m_sDescription += OUString::number(
+            sal::static_int_cast< sal_Int64 >(
+                reinterpret_cast< sal_IntPtr >(&m_pipe)) );
+    }
+
+    PipeConnection::~PipeConnection()
+    {
+    }
+
+    sal_Int32 PipeConnection::read( Sequence < sal_Int8 > & aReadBytes , sal_Int32 nBytesToRead )
+    {
+        if( m_nStatus )
+        {
+            throw IOException("pipe already closed");
+        }
+        if( aReadBytes.getLength() != nBytesToRead )
+        {
+            aReadBytes.realloc( nBytesToRead );
+        }
+        return m_pipe.read( aReadBytes.getArray()  , aReadBytes.getLength() );
+
+    }
+
+    void PipeConnection::write( const Sequence < sal_Int8 > &seq )
+    {
+        if( m_nStatus )
+        {
+            throw IOException("pipe already closed");
+        }
+        if( m_pipe.write( seq.getConstArray() , seq.getLength() ) != seq.getLength() )
+        {
+            throw IOException("short write");
+        }
+    }
+
+    void PipeConnection::flush( )
+    {
+
+    }
+
+    void PipeConnection::close()
+    {
+        // ensure that close is called only once
+        if(1 == osl_atomic_increment( (&m_nStatus) ) )
+        {
+            m_pipe.close();
+        }
+    }
+
+    OUString PipeConnection::getDescription()
+    {
+        return m_sDescription;
+    }
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/connector/ctr_socket.cxx b/io/source/connector/ctr_socket.cxx
new file mode 100644
index 000000000..dcdeef07f
--- /dev/null
+++ b/io/source/connector/ctr_socket.cxx
@@ -0,0 +1,225 @@
+/* -*- 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 "connector.hxx"
+#include <com/sun/star/io/IOException.hpp>
+
+using namespace ::osl;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::connection;
+
+
+namespace stoc_connector {
+    template<class T>
+    static void notifyListeners(SocketConnection * pCon, bool * notified, T t)
+    {
+        XStreamListener_hash_set listeners;
+
+        {
+            std::unique_lock guard(pCon->_mutex);
+            if(!*notified)
+            {
+                *notified = true;
+                listeners = pCon->_listeners;
+            }
+        }
+
+        for(auto& listener : listeners)
+            t(listener);
+    }
+
+
+    static void callStarted(const Reference<XStreamListener>& xStreamListener)
+    {
+        xStreamListener->started();
+    }
+
+    namespace {
+
+    struct callError {
+        const Any & any;
+
+        explicit callError(const Any & any);
+
+        void operator () (const Reference<XStreamListener>& xStreamListener);
+    };
+
+    }
+
+    callError::callError(const Any & aAny)
+        : any(aAny)
+    {
+    }
+
+    void callError::operator () (const Reference<XStreamListener>& xStreamListener)
+    {
+        xStreamListener->error(any);
+    }
+
+    static void callClosed(const Reference<XStreamListener>& xStreamListener)
+    {
+        xStreamListener->closed();
+    }
+
+
+    SocketConnection::SocketConnection( const OUString &sConnectionDescription ) :
+        m_nStatus( 0 ),
+        m_sDescription( sConnectionDescription ),
+        _started(false),
+        _closed(false),
+        _error(false)
+    {
+        // make it unique
+        m_sDescription += ",uniqueValue=";
+        m_sDescription += OUString::number(
+            sal::static_int_cast< sal_Int64 >(
+                reinterpret_cast< sal_IntPtr >(&m_socket)) );
+    }
+
+    SocketConnection::~SocketConnection()
+    {
+    }
+
+    void SocketConnection::completeConnectionString()
+    {
+        sal_Int32 nPort;
+
+        nPort = m_socket.getPeerPort();
+
+        m_sDescription +=
+            ",peerPort=" + OUString::number( nPort ) +
+            ",peerHost=" + m_socket.getPeerHost() +
+            ",localPort=" + OUString::number( nPort ) +
+            ",localHost=" + m_socket.getLocalHost( );
+    }
+
+    sal_Int32 SocketConnection::read( Sequence < sal_Int8 > & aReadBytes , sal_Int32 nBytesToRead )
+    {
+        if( ! m_nStatus )
+        {
+            notifyListeners(this, &_started, callStarted);
+
+            if( aReadBytes.getLength() != nBytesToRead )
+            {
+                aReadBytes.realloc( nBytesToRead );
+            }
+            sal_Int32 i = m_socket.read( aReadBytes.getArray()  , aReadBytes.getLength() );
+
+            if(i != nBytesToRead && m_socket.getError() != osl_Socket_E_None)
+            {
+                OUString message = "ctr_socket.cxx:SocketConnection::read: error - " +
+                    m_socket.getErrorAsString();
+
+                IOException ioException(message, static_cast<XConnection *>(this));
+
+                Any any;
+                any <<= ioException;
+
+                notifyListeners(this, &_error, callError(any));
+
+                throw ioException;
+            }
+
+            return i;
+        }
+        else
+        {
+            IOException ioException("ctr_socket.cxx:SocketConnection::read: error - connection already closed", static_cast<XConnection *>(this));
+
+            Any any;
+            any <<= ioException;
+
+            notifyListeners(this, &_error, callError(any));
+
+            throw ioException;
+        }
+    }
+
+    void SocketConnection::write( const Sequence < sal_Int8 > &seq )
+    {
+        if( ! m_nStatus )
+        {
+            if( m_socket.write( seq.getConstArray() , seq.getLength() ) != seq.getLength() )
+            {
+                OUString message = "ctr_socket.cxx:SocketConnection::write: error - " +
+                    m_socket.getErrorAsString();
+
+                IOException ioException(message, static_cast<XConnection *>(this));
+
+                Any any;
+                any <<= ioException;
+
+                notifyListeners(this, &_error, callError(any));
+
+                throw ioException;
+            }
+        }
+        else
+        {
+            IOException ioException("ctr_socket.cxx:SocketConnection::write: error - connection already closed", static_cast<XConnection *>(this));
+
+            Any any;
+            any <<= ioException;
+
+            notifyListeners(this, &_error, callError(any));
+
+            throw ioException;
+        }
+    }
+
+    void SocketConnection::flush( )
+    {
+
+    }
+
+    void SocketConnection::close()
+    {
+            // ensure that close is called only once
+        if( 1 == osl_atomic_increment( (&m_nStatus) ) )
+        {
+            m_socket.shutdown();
+            notifyListeners(this, &_closed, callClosed);
+        }
+    }
+
+    OUString SocketConnection::getDescription()
+    {
+        return m_sDescription;
+    }
+
+
+    // XConnectionBroadcaster
+    void SAL_CALL SocketConnection::addStreamListener(const Reference<XStreamListener> & aListener)
+    {
+        std::unique_lock guard(_mutex);
+
+        _listeners.insert(aListener);
+    }
+
+    void SAL_CALL SocketConnection::removeStreamListener(const Reference<XStreamListener> & aListener)
+    {
+        std::unique_lock guard(_mutex);
+
+        _listeners.erase(aListener);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/io.component b/io/source/io.component
new file mode 100644
index 000000000..a5712c0f6
--- /dev/null
+++ b/io/source/io.component
@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * 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 .
+ -->
+
+<component loader="com.sun.star.loader.SharedLibrary" environment="@CPPU_ENV@"
+    xmlns="http://openoffice.org/2010/uno-components">
+  <implementation name="com.sun.star.comp.io.Pump"
+    constructor="io_Pump_get_implementation">
+    <service name="com.sun.star.io.Pump"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.stm.DataInputStream"
+    constructor="io_ODataInputStream_get_implementation">
+    <service name="com.sun.star.io.DataInputStream"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.stm.DataOutputStream"
+    constructor="io_ODataOutputStream_get_implementation">
+    <service name="com.sun.star.io.DataOutputStream"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.stm.MarkableInputStream"
+    constructor="io_OMarkableInputStream_get_implementation">
+    <service name="com.sun.star.io.MarkableInputStream"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.stm.MarkableOutputStream"
+    constructor="io_OMarkableOutputStream_get_implementation">
+    <service name="com.sun.star.io.MarkableOutputStream"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.stm.ObjectInputStream"
+    constructor="io_OObjectInputStream_get_implementation">
+    <service name="com.sun.star.io.ObjectInputStream"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.stm.ObjectOutputStream"
+    constructor="io_OObjectOutputStream_get_implementation">
+    <service name="com.sun.star.io.ObjectOutputStream"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.stm.Pipe"
+    constructor="io_OPipeImpl_get_implementation">
+    <service name="com.sun.star.io.Pipe"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.Acceptor"
+    constructor="io_OAcceptor_get_implementation">
+    <service name="com.sun.star.connection.Acceptor"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.Connector"
+    constructor="io_OConnector_get_implementation">
+    <service name="com.sun.star.connection.Connector"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.TextInputStream"
+    constructor="io_OTextInputStream_get_implementation">
+    <service name="com.sun.star.io.TextInputStream"/>
+  </implementation>
+  <implementation name="com.sun.star.comp.io.TextOutputStream"
+    constructor="io_OTextOutputStream_get_implementation">
+    <service name="com.sun.star.io.TextOutputStream"/>
+  </implementation>
+</component>
diff --git a/io/source/stm/odata.cxx b/io/source/stm/odata.cxx
new file mode 100644
index 000000000..754cda450
--- /dev/null
+++ b/io/source/stm/odata.cxx
@@ -0,0 +1,1231 @@
+/* -*- 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 <string.h>
+#include <unordered_map>
+#include <vector>
+
+#include <cppuhelper/weak.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/endian.h>
+#include <tools/long.hxx>
+
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XObjectInputStream.hpp>
+#include <com/sun/star/io/XObjectOutputStream.hpp>
+#include <com/sun/star/io/XActiveDataSource.hpp>
+#include <com/sun/star/io/XActiveDataSink.hpp>
+#include <com/sun/star/io/XMarkableStream.hpp>
+#include <com/sun/star/io/XConnectable.hpp>
+#include <com/sun/star/io/UnexpectedEOFException.hpp>
+#include <com/sun/star/io/WrongFormatException.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+using namespace ::cppu;
+using namespace ::osl;
+using namespace ::std;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+
+namespace io_stm {
+
+namespace {
+
+class ODataInputStream :
+    public WeakImplHelper <
+                              XDataInputStream,
+                              XActiveDataSink,
+                              XConnectable,
+                              XServiceInfo
+                           >
+{
+public:
+    ODataInputStream( )
+        : m_bValidStream( false )
+        {
+        }
+
+public: // XInputStream
+    virtual sal_Int32 SAL_CALL readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead) override;
+    virtual sal_Int32 SAL_CALL readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead) override;
+    virtual void SAL_CALL skipBytes(sal_Int32 nBytesToSkip) override;
+    virtual sal_Int32 SAL_CALL available() override;
+    virtual void SAL_CALL closeInput() override;
+
+public: // XDataInputStream
+    virtual sal_Int8 SAL_CALL readBoolean() override;
+    virtual sal_Int8 SAL_CALL readByte() override;
+    virtual sal_Unicode SAL_CALL readChar() override;
+    virtual sal_Int16 SAL_CALL readShort() override;
+    virtual sal_Int32 SAL_CALL readLong() override;
+    virtual sal_Int64 SAL_CALL readHyper() override;
+    virtual float SAL_CALL readFloat() override;
+    virtual double SAL_CALL readDouble() override;
+    virtual OUString SAL_CALL readUTF() override;
+
+
+public: // XActiveDataSink
+    virtual void SAL_CALL setInputStream(const Reference< XInputStream > & aStream) override;
+    virtual Reference< XInputStream > SAL_CALL getInputStream() override;
+
+public: // XConnectable
+    virtual void SAL_CALL setPredecessor(const Reference < XConnectable >& aPredecessor) override;
+    virtual Reference < XConnectable > SAL_CALL getPredecessor() override;
+    virtual void SAL_CALL setSuccessor(const Reference < XConnectable >& aSuccessor) override;
+    virtual Reference < XConnectable > SAL_CALL getSuccessor() override ;
+
+
+public: // XServiceInfo
+    OUString                     SAL_CALL getImplementationName() override;
+    Sequence< OUString >         SAL_CALL getSupportedServiceNames() override;
+    sal_Bool                        SAL_CALL supportsService(const OUString& ServiceName) override;
+
+protected:
+
+    Reference < XConnectable >  m_pred;
+    Reference < XConnectable >  m_succ;
+    Reference < XInputStream >  m_input;
+    bool m_bValidStream;
+};
+
+}
+
+// XInputStream
+sal_Int32 ODataInputStream::readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead)
+{
+     if( !m_bValidStream )
+     {
+         throw NotConnectedException( );
+     }
+     sal_Int32 nRead = m_input->readBytes( aData , nBytesToRead );
+     return nRead;
+}
+
+sal_Int32 ODataInputStream::readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead)
+{
+     if( !m_bValidStream )
+         throw NotConnectedException( );
+     sal_Int32 nRead = m_input->readSomeBytes( aData , nMaxBytesToRead );
+     return nRead;
+}
+void ODataInputStream::skipBytes(sal_Int32 nBytesToSkip)
+{
+     if( !m_bValidStream )
+         throw NotConnectedException( );
+     m_input->skipBytes( nBytesToSkip );
+}
+
+
+sal_Int32 ODataInputStream::available()
+{
+     if( !m_bValidStream )
+         throw NotConnectedException( );
+     sal_Int32 nAvail = m_input->available( );
+     return nAvail;
+}
+
+void ODataInputStream::closeInput()
+{
+     if( !m_bValidStream )
+         throw NotConnectedException( );
+     m_input->closeInput( );
+     setInputStream( Reference< XInputStream > () );
+     setPredecessor( Reference < XConnectable >() );
+     setSuccessor( Reference < XConnectable >() );
+     m_bValidStream = false;
+}
+
+
+//== XDataInputStream ===========================================
+
+// XDataInputStream
+sal_Int8 ODataInputStream::readBoolean()
+{
+    return readByte();
+}
+
+sal_Int8 ODataInputStream::readByte()
+{
+    Sequence<sal_Int8> aTmp(1);
+    if( 1 != readBytes( aTmp, 1 ) )
+    {
+        throw UnexpectedEOFException();
+    }
+    return aTmp.getConstArray()[0];
+}
+
+sal_Unicode ODataInputStream::readChar()
+{
+    Sequence<sal_Int8> aTmp(2);
+    if( 2 != readBytes( aTmp, 2 ) )
+    {
+        throw UnexpectedEOFException();
+    }
+
+    const sal_uInt8 * pBytes = reinterpret_cast<const sal_uInt8 *>(aTmp.getConstArray());
+    return (static_cast<sal_Unicode>(pBytes[0]) << 8) + pBytes[1];
+}
+
+sal_Int16 ODataInputStream::readShort()
+{
+    Sequence<sal_Int8> aTmp(2);
+    if( 2 != readBytes( aTmp, 2 ) )
+    {
+        throw UnexpectedEOFException();
+    }
+
+    const sal_uInt8 * pBytes = reinterpret_cast<const sal_uInt8 *>(aTmp.getConstArray());
+    return (static_cast<sal_Int16>(pBytes[0]) << 8) + pBytes[1];
+}
+
+
+sal_Int32 ODataInputStream::readLong()
+{
+    Sequence<sal_Int8> aTmp(4);
+    if( 4 != readBytes( aTmp, 4 ) )
+    {
+        throw UnexpectedEOFException( );
+    }
+
+    const sal_uInt8 * pBytes = reinterpret_cast<const sal_uInt8 *>(aTmp.getConstArray());
+    return (static_cast<sal_Int32>(pBytes[0]) << 24) + (static_cast<sal_Int32>(pBytes[1]) << 16) + (static_cast<sal_Int32>(pBytes[2]) << 8) + pBytes[3];
+}
+
+
+sal_Int64 ODataInputStream::readHyper()
+{
+    Sequence<sal_Int8> aTmp(8);
+    if( 8 != readBytes( aTmp, 8 ) )
+    {
+        throw UnexpectedEOFException( );
+    }
+
+    const sal_uInt8 * pBytes = reinterpret_cast<const sal_uInt8 *>(aTmp.getConstArray());
+    return
+        (static_cast<sal_Int64>(pBytes[0]) << 56) +
+        (static_cast<sal_Int64>(pBytes[1]) << 48) +
+        (static_cast<sal_Int64>(pBytes[2]) << 40) +
+        (static_cast<sal_Int64>(pBytes[3]) << 32) +
+        (static_cast<sal_Int64>(pBytes[4]) << 24) +
+        (static_cast<sal_Int64>(pBytes[5]) << 16) +
+        (static_cast<sal_Int64>(pBytes[6]) << 8) +
+        pBytes[7];
+}
+
+float ODataInputStream::readFloat()
+{
+    union { float f; sal_uInt32 n; } a;
+    a.n = readLong();
+    return a.f;
+}
+
+double ODataInputStream::readDouble()
+{
+    union { double d; struct { sal_uInt32 n1; sal_uInt32 n2; } ad; } a;
+#if defined OSL_LITENDIAN
+    a.ad.n2 = readLong();
+    a.ad.n1 = readLong();
+#else
+    a.ad.n1 = readLong();
+    a.ad.n2 = readLong();
+#endif
+    return a.d;
+}
+
+OUString ODataInputStream::readUTF()
+{
+    sal_uInt16              nShortLen = static_cast<sal_uInt16>(readShort());
+    sal_Int32               nUTFLen;
+
+    if( (sal_uInt16(0xffff)) == nShortLen )
+    {
+        // is interpreted as a sign, that string is longer than 64k
+        // incompatible to older XDataInputStream-routines, when strings are exactly 64k
+        nUTFLen = readLong();
+    }
+    else
+    {
+        nUTFLen = static_cast<sal_Int32>(nShortLen);
+    }
+
+    Sequence<sal_Unicode>   aBuffer( nUTFLen );
+    sal_Unicode *           pStr = aBuffer.getArray();
+
+    sal_Int32 nCount = 0;
+    sal_Int32 nStrLen = 0;
+    while( nCount < nUTFLen )
+    {
+        sal_uInt8 c = static_cast<sal_uInt8>(readByte());
+        sal_uInt8 char2, char3;
+        switch( c >> 4 )
+        {
+            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
+                // 0xxxxxxx
+                nCount++;
+                pStr[nStrLen++] = c;
+                break;
+
+            case 12: case 13:
+                // 110x xxxx   10xx xxxx
+                nCount += 2;
+                if( nCount > nUTFLen )
+                {
+                    throw WrongFormatException( );
+                }
+
+                char2 = static_cast<sal_uInt8>(readByte());
+                if( (char2 & 0xC0) != 0x80 )
+                {
+                    throw WrongFormatException( );
+                }
+
+                pStr[nStrLen++] = (sal_Unicode(c & 0x1F) << 6) | (char2 & 0x3F);
+                break;
+
+            case 14:
+            // 1110 xxxx  10xx xxxx  10xx xxxx
+                nCount += 3;
+                if( nCount > nUTFLen )
+                {
+                    throw WrongFormatException( );
+                }
+
+                char2 = static_cast<sal_uInt8>(readByte());
+                char3 = static_cast<sal_uInt8>(readByte());
+
+                if( ((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80) ) {
+                    throw WrongFormatException( );
+                }
+                pStr[nStrLen++] = (sal_Unicode(c & 0x0F) << 12) |
+                                (sal_Unicode(char2 & 0x3F) << 6) |
+                                (char3 & 0x3F);
+                break;
+
+            default:
+                // 10xx xxxx,  1111 xxxx
+                throw WrongFormatException();
+                //throw new UTFDataFormatException();
+        }
+    }
+    return OUString( pStr, nStrLen );
+}
+
+
+// XActiveDataSource
+void ODataInputStream::setInputStream(const Reference< XInputStream > & aStream)
+{
+
+    if( m_input != aStream ) {
+        m_input = aStream;
+
+        Reference < XConnectable > pred( m_input , UNO_QUERY );
+        setPredecessor( pred );
+    }
+
+    m_bValidStream = m_input.is();
+}
+
+Reference< XInputStream > ODataInputStream::getInputStream()
+{
+    return m_input;
+}
+
+
+// XDataSink
+void ODataInputStream::setSuccessor( const Reference < XConnectable > &r )
+{
+     /// if the references match, nothing needs to be done
+     if( m_succ != r ) {
+         /// store the reference for later use
+         m_succ = r;
+
+         if( m_succ.is() ) {
+              /// set this instance as the sink !
+              m_succ->setPredecessor( Reference< XConnectable > (
+                  static_cast< XConnectable * >(this) ) );
+         }
+     }
+}
+
+Reference < XConnectable > ODataInputStream::getSuccessor()
+{
+    return m_succ;
+}
+
+
+// XDataSource
+void ODataInputStream::setPredecessor( const Reference < XConnectable > &r )
+{
+    if( r != m_pred ) {
+        m_pred = r;
+        if( m_pred.is() ) {
+            m_pred->setSuccessor( Reference< XConnectable > (
+                static_cast< XConnectable * >(this) ) );
+        }
+    }
+}
+Reference < XConnectable > ODataInputStream::getPredecessor()
+{
+    return m_pred;
+}
+
+// XServiceInfo
+OUString ODataInputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.stm.DataInputStream";
+}
+
+// XServiceInfo
+sal_Bool ODataInputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > ODataInputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.DataInputStream" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_ODataInputStream_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new ODataInputStream());
+}
+
+namespace {
+
+class ODataOutputStream :
+    public WeakImplHelper <
+             XDataOutputStream,
+             XActiveDataSource,
+             XConnectable,
+              XServiceInfo >
+{
+public:
+    ODataOutputStream()
+        : m_bValidStream( false )
+        {
+        }
+
+public: // XOutputStream
+    virtual void SAL_CALL writeBytes(const Sequence< sal_Int8 >& aData) override;
+    virtual void SAL_CALL flush() override;
+    virtual void SAL_CALL closeOutput() override;
+
+public: // XDataOutputStream
+    virtual void SAL_CALL writeBoolean(sal_Bool Value) override;
+    virtual void SAL_CALL writeByte(sal_Int8 Value) override;
+    virtual void SAL_CALL writeChar(sal_Unicode Value) override;
+    virtual void SAL_CALL writeShort(sal_Int16 Value) override;
+    virtual void SAL_CALL writeLong(sal_Int32 Value) override;
+    virtual void SAL_CALL writeHyper(sal_Int64 Value) override;
+    virtual void SAL_CALL writeFloat(float Value) override;
+    virtual void SAL_CALL writeDouble(double Value) override;
+    virtual void SAL_CALL writeUTF(const OUString& Value) override;
+
+public: // XActiveDataSource
+    virtual void SAL_CALL setOutputStream(const Reference< XOutputStream > & aStream) override;
+    virtual Reference < XOutputStream > SAL_CALL getOutputStream() override;
+
+public: // XConnectable
+    virtual void SAL_CALL setPredecessor(const Reference < XConnectable >& aPredecessor) override;
+    virtual Reference < XConnectable > SAL_CALL getPredecessor() override;
+    virtual void SAL_CALL setSuccessor(const Reference < XConnectable >& aSuccessor) override;
+    virtual Reference < XConnectable > SAL_CALL getSuccessor() override;
+
+public: // XServiceInfo
+    OUString                     SAL_CALL getImplementationName() override;
+    Sequence< OUString >         SAL_CALL getSupportedServiceNames() override;
+    sal_Bool                     SAL_CALL supportsService(const OUString& ServiceName) override;
+
+protected:
+    Reference < XConnectable >  m_succ;
+    Reference < XConnectable >  m_pred;
+    Reference<  XOutputStream > m_output;
+    bool m_bValidStream;
+};
+
+}
+
+// XOutputStream
+void ODataOutputStream::writeBytes(const Sequence< sal_Int8 >& aData)
+{
+    if( !m_bValidStream )
+        throw NotConnectedException( );
+    m_output->writeBytes( aData );
+}
+
+void ODataOutputStream::flush()
+{
+    if( !m_bValidStream )
+        throw NotConnectedException();
+    m_output->flush();
+}
+
+
+void ODataOutputStream::closeOutput()
+{
+    if( !m_bValidStream )
+        throw NotConnectedException();
+    m_output->closeOutput();
+    setOutputStream( Reference< XOutputStream > () );
+    setPredecessor( Reference < XConnectable >() );
+    setSuccessor( Reference < XConnectable >() );
+}
+
+// XDataOutputStream
+void ODataOutputStream::writeBoolean(sal_Bool Value)
+{
+    if( Value )
+    {
+        writeByte( 1 );
+    }
+    else
+    {
+        writeByte( 0 );
+    }
+}
+
+
+void ODataOutputStream::writeByte(sal_Int8 Value)
+{
+    writeBytes( { Value } );
+}
+
+void ODataOutputStream::writeChar(sal_Unicode Value)
+{
+    writeBytes( { sal_Int8(Value >> 8),
+                  sal_Int8(Value) } );
+}
+
+
+void ODataOutputStream::writeShort(sal_Int16 Value)
+{
+    writeBytes( { sal_Int8(Value >> 8),
+                  sal_Int8(Value) } );
+}
+
+void ODataOutputStream::writeLong(sal_Int32 Value)
+{
+    writeBytes( { sal_Int8(Value >> 24),
+                  sal_Int8(Value >> 16),
+                  sal_Int8(Value >> 8),
+                  sal_Int8(Value) } );
+}
+
+void ODataOutputStream::writeHyper(sal_Int64 Value)
+{
+    writeBytes( { sal_Int8(Value >> 56),
+                  sal_Int8(Value >> 48),
+                  sal_Int8(Value >> 40),
+                  sal_Int8(Value >> 32),
+                  sal_Int8(Value >> 24),
+                  sal_Int8(Value >> 16),
+                  sal_Int8(Value >> 8),
+                  sal_Int8(Value) } );
+}
+
+
+void ODataOutputStream::writeFloat(float Value)
+{
+    union { float f; sal_uInt32 n; } a;
+    a.f = Value;
+    writeLong( a.n );
+}
+
+void ODataOutputStream::writeDouble(double Value)
+{
+    union { double d; struct { sal_uInt32 n1; sal_uInt32 n2; } ad; } a;
+    a.d = Value;
+#if defined OSL_LITENDIAN
+    writeLong( a.ad.n2 );
+    writeLong( a.ad.n1 );
+#else
+    writeLong( a.ad.n1 );
+    writeLong( a.ad.n2 );
+#endif
+}
+
+void ODataOutputStream::writeUTF(const OUString& Value)
+{
+    sal_Int32 nStrLen = Value.getLength();
+    const sal_Unicode * pStr = Value.getStr();
+    sal_Int32 nUTFLen = 0;
+    sal_Int32 i;
+
+    for( i = 0 ; i < nStrLen ; i++ )
+    {
+        sal_uInt16 c = pStr[i];
+        if( (c >= 0x0001) && (c <= 0x007F) )
+        {
+            nUTFLen++;
+        }
+        else if( c > 0x07FF )
+        {
+            nUTFLen += 3;
+        }
+        else
+        {
+            nUTFLen += 2;
+        }
+    }
+
+
+    // compatibility mode for older implementations, where it was not possible
+    // to write blocks bigger than 64 k. Note that there is a tradeoff. Blocks,
+    // that are exactly 64k long can not be read by older routines when written
+    // with these routines and the other way round !!!!!
+    if( nUTFLen >= 0xFFFF ) {
+        writeShort( sal_Int16(-1) );
+        writeLong( nUTFLen );
+    }
+    else {
+        writeShort( static_cast<sal_uInt16>(nUTFLen) );
+    }
+    for( i = 0 ; i < nStrLen ; i++ )
+    {
+        sal_uInt16 c = pStr[i];
+        if( (c >= 0x0001) && (c <= 0x007F) )
+        {
+            writeByte(sal_Int8(c));
+        }
+        else if( c > 0x07FF )
+        {
+            writeByte(sal_Int8(0xE0 | ((c >> 12) & 0x0F)));
+            writeByte(sal_Int8(0x80 | ((c >>  6) & 0x3F)));
+            writeByte(sal_Int8(0x80 | ((c >>  0) & 0x3F)));
+        }
+        else
+        {
+            writeByte(sal_Int8(0xC0 | ((c >>  6) & 0x1F)));
+            writeByte(sal_Int8(0x80 | ((c >>  0) & 0x3F)));
+        }
+    }
+}
+
+// XActiveDataSource
+void ODataOutputStream::setOutputStream(const Reference< XOutputStream > & aStream)
+{
+    if( m_output != aStream ) {
+        m_output = aStream;
+        m_bValidStream = m_output.is();
+
+        Reference < XConnectable > succ( m_output , UNO_QUERY );
+        setSuccessor( succ );
+    }
+}
+
+Reference< XOutputStream > ODataOutputStream::getOutputStream()
+{
+    return m_output;
+}
+
+
+// XDataSink
+void ODataOutputStream::setSuccessor( const Reference < XConnectable > &r )
+{
+     /// if the references match, nothing needs to be done
+     if( m_succ != r )
+     {
+         /// store the reference for later use
+         m_succ = r;
+
+         if( m_succ.is() )
+         {
+              /// set this instance as the sink !
+              m_succ->setPredecessor( Reference < XConnectable > (
+                  static_cast< XConnectable * >(this) ));
+         }
+     }
+}
+Reference < XConnectable > ODataOutputStream::getSuccessor()
+{
+    return m_succ;
+}
+
+
+// XDataSource
+void ODataOutputStream::setPredecessor( const Reference < XConnectable > &r )
+{
+    if( r != m_pred ) {
+        m_pred = r;
+        if( m_pred.is() ) {
+            m_pred->setSuccessor( Reference< XConnectable > (
+                static_cast< XConnectable * >(this) ));
+        }
+    }
+}
+Reference < XConnectable > ODataOutputStream::getPredecessor()
+{
+    return m_pred;
+}
+
+
+// XServiceInfo
+OUString ODataOutputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.stm.DataOutputStream";
+}
+
+// XServiceInfo
+sal_Bool ODataOutputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > ODataOutputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.DataOutputStream" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_ODataOutputStream_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new ODataOutputStream());
+}
+
+namespace {
+
+struct equalObjectContainer_Impl
+{
+    bool operator()(const Reference< XInterface > & s1,
+                         const Reference< XInterface > & s2) const
+      {
+        return s1 == s2;
+    }
+};
+
+
+struct hashObjectContainer_Impl
+{
+    size_t operator()(const Reference< XInterface > & xRef) const
+    {
+        return reinterpret_cast<size_t>(xRef.get());
+    }
+};
+
+}
+
+typedef std::unordered_map
+<
+    Reference< XInterface >,
+    sal_Int32,
+    hashObjectContainer_Impl,
+    equalObjectContainer_Impl
+> ObjectContainer_Impl;
+
+namespace {
+
+class OObjectOutputStream:
+    public ImplInheritanceHelper<
+            ODataOutputStream, /* parent */
+            XObjectOutputStream, XMarkableStream >
+{
+public:
+    OObjectOutputStream()
+        : m_nMaxId(0) ,
+          m_bValidMarkable(false)
+        {
+        }
+
+public:
+    // XOutputStream
+    virtual void SAL_CALL writeBytes(const Sequence< sal_Int8 >& aData) override
+        { ODataOutputStream::writeBytes( aData ); }
+
+    virtual void SAL_CALL flush() override
+        { ODataOutputStream::flush(); }
+
+    virtual void SAL_CALL closeOutput() override
+        { ODataOutputStream::closeOutput(); }
+
+public:
+    // XDataOutputStream
+    virtual void SAL_CALL writeBoolean(sal_Bool Value) override
+                { ODataOutputStream::writeBoolean( Value ); }
+    virtual void SAL_CALL writeByte(sal_Int8 Value) override
+                { ODataOutputStream::writeByte( Value ); }
+    virtual void SAL_CALL writeChar(sal_Unicode Value) override
+                { ODataOutputStream::writeChar( Value ); }
+    virtual void SAL_CALL writeShort(sal_Int16 Value) override
+                { ODataOutputStream::writeShort( Value ); }
+    virtual void SAL_CALL writeLong(sal_Int32 Value) override
+                { ODataOutputStream::writeLong( Value ); }
+    virtual void SAL_CALL writeHyper(sal_Int64 Value) override
+                { ODataOutputStream::writeHyper( Value ); }
+    virtual void SAL_CALL writeFloat(float Value) override
+                { ODataOutputStream::writeFloat( Value ); }
+    virtual void SAL_CALL writeDouble(double Value) override
+                { ODataOutputStream::writeDouble( Value ); }
+    virtual void SAL_CALL writeUTF(const OUString& Value) override
+                { ODataOutputStream::writeUTF( Value );}
+
+    // XObjectOutputStream
+        virtual void SAL_CALL writeObject( const Reference< XPersistObject > & r ) override;
+
+public: // XMarkableStream
+    virtual sal_Int32 SAL_CALL createMark() override;
+    virtual void SAL_CALL deleteMark(sal_Int32 Mark) override;
+    virtual void SAL_CALL jumpToMark(sal_Int32 nMark) override;
+    virtual void SAL_CALL jumpToFurthest() override;
+    virtual sal_Int32 SAL_CALL offsetToMark(sal_Int32 nMark) override;
+
+public: // XServiceInfo
+    OUString                   SAL_CALL   getImplementationName() override;
+    Sequence< OUString >       SAL_CALL   getSupportedServiceNames() override;
+    sal_Bool                   SAL_CALL   supportsService(const OUString& ServiceName) override;
+
+private:
+    void connectToMarkable();
+private:
+    ObjectContainer_Impl                m_mapObject;
+    sal_Int32                           m_nMaxId;
+    Reference< XMarkableStream >        m_rMarkable;
+    bool                            m_bValidMarkable;
+};
+
+}
+
+void OObjectOutputStream::writeObject( const Reference< XPersistObject > & xPObj )
+{
+
+    connectToMarkable();
+    bool bWriteObj = false;
+    // create Mark to write length of info
+    sal_uInt32 nInfoLenMark = m_rMarkable->createMark();
+
+    // length of the info data (is later rewritten)
+    OObjectOutputStream::writeShort( 0 );
+
+    // write the object identifier
+    if( xPObj.is() )
+    {
+        Reference< XInterface > rX( xPObj , UNO_QUERY );
+
+        ObjectContainer_Impl::const_iterator aIt
+            = m_mapObject.find( rX );
+        if( aIt == m_mapObject.end() )
+        {
+            // insert new object in hash table
+            m_mapObject[ rX ] = ++m_nMaxId;
+            ODataOutputStream::writeLong( m_nMaxId );
+            ODataOutputStream::writeUTF( xPObj->getServiceName() );
+            bWriteObj = true;
+        }
+        else
+        {
+            ODataOutputStream::writeLong( (*aIt).second );
+            ODataOutputStream::writeUTF( OUString() );
+        }
+    }
+    else
+    {
+        ODataOutputStream::writeLong( 0 );
+        ODataOutputStream::writeUTF( OUString() );
+    }
+
+    sal_uInt32 nObjLenMark = m_rMarkable->createMark();
+    ODataOutputStream::writeLong( 0 );
+
+    sal_Int32 nInfoLen = m_rMarkable->offsetToMark( nInfoLenMark );
+    m_rMarkable->jumpToMark( nInfoLenMark );
+    // write length of the info data
+    ODataOutputStream::writeShort( static_cast<sal_Int16>(nInfoLen) );
+    // jump to the end of the stream
+    m_rMarkable->jumpToFurthest();
+
+    if( bWriteObj )
+        xPObj->write( Reference< XObjectOutputStream > (
+            static_cast< XObjectOutputStream *  >(this) ) );
+
+    sal_Int32 nObjLen = m_rMarkable->offsetToMark( nObjLenMark ) -4;
+    m_rMarkable->jumpToMark( nObjLenMark );
+    // write length of the info data
+    ODataOutputStream::writeLong( nObjLen );
+    // jump to the end of the stream
+    m_rMarkable->jumpToFurthest();
+
+    m_rMarkable->deleteMark( nObjLenMark );
+    m_rMarkable->deleteMark( nInfoLenMark );
+}
+
+
+void OObjectOutputStream::connectToMarkable()
+{
+    if(  m_bValidMarkable )
+        return;
+
+    if( ! m_bValidStream )
+        throw NotConnectedException();
+
+    // find the markable stream !
+    Reference< XInterface > rTry(m_output);
+    while( true ) {
+        if( ! rTry.is() )
+        {
+            throw NotConnectedException();
+        }
+        Reference < XMarkableStream > markable( rTry , UNO_QUERY );
+        if( markable.is() )
+        {
+            m_rMarkable = markable;
+            break;
+        }
+        Reference < XActiveDataSource > source( rTry , UNO_QUERY );
+        rTry = source;
+    }
+    m_bValidMarkable = true;
+}
+
+
+sal_Int32 OObjectOutputStream::createMark()
+{
+    connectToMarkable();    // throws an exception, if a markable is not connected !
+
+    return m_rMarkable->createMark();
+}
+
+void OObjectOutputStream::deleteMark(sal_Int32 Mark)
+{
+    if( ! m_bValidMarkable )
+    {
+        throw NotConnectedException();
+    }
+    m_rMarkable->deleteMark( Mark );
+}
+
+void OObjectOutputStream::jumpToMark(sal_Int32 nMark)
+{
+    if( ! m_bValidMarkable )
+    {
+        throw NotConnectedException();
+    }
+    m_rMarkable->jumpToMark( nMark );
+}
+
+
+void OObjectOutputStream::jumpToFurthest()
+{
+    connectToMarkable();
+    m_rMarkable->jumpToFurthest();
+}
+
+sal_Int32 OObjectOutputStream::offsetToMark(sal_Int32 nMark)
+{
+    if( ! m_bValidMarkable )
+    {
+        throw NotConnectedException();
+    }
+    return m_rMarkable->offsetToMark( nMark );
+}
+
+// XServiceInfo
+OUString OObjectOutputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.stm.ObjectOutputStream";
+}
+
+// XServiceInfo
+sal_Bool OObjectOutputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > OObjectOutputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.ObjectOutputStream" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OObjectOutputStream_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OObjectOutputStream());
+}
+
+namespace {
+
+class OObjectInputStream:
+    public ImplInheritanceHelper<
+        ODataInputStream, /* parent */
+        XObjectInputStream, XMarkableStream >
+{
+public:
+    explicit OObjectInputStream( const Reference < XComponentContext > &r)
+        : m_rSMgr( r->getServiceManager() )
+        , m_rCxt( r )
+        , m_bValidMarkable(false)
+        {
+        }
+
+public: // XInputStream
+    virtual sal_Int32 SAL_CALL readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead) override
+        { return ODataInputStream::readBytes( aData , nBytesToRead ); }
+
+    virtual sal_Int32 SAL_CALL readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead) override
+        { return ODataInputStream::readSomeBytes( aData, nMaxBytesToRead ); }
+
+    virtual void SAL_CALL skipBytes(sal_Int32 nBytesToSkip) override
+        { ODataInputStream::skipBytes( nBytesToSkip ); }
+
+    virtual sal_Int32 SAL_CALL available() override
+        { return ODataInputStream::available(); }
+
+    virtual void SAL_CALL closeInput() override
+        { ODataInputStream::closeInput(); }
+
+public: // XDataInputStream
+    virtual sal_Int8 SAL_CALL readBoolean() override
+                { return ODataInputStream::readBoolean(); }
+    virtual sal_Int8 SAL_CALL readByte() override
+                { return ODataInputStream::readByte(); }
+    virtual sal_Unicode SAL_CALL readChar() override
+                { return ODataInputStream::readChar(); }
+    virtual sal_Int16 SAL_CALL readShort() override
+                { return ODataInputStream::readShort(); }
+    virtual sal_Int32 SAL_CALL readLong() override
+                { return ODataInputStream::readLong(); }
+    virtual sal_Int64 SAL_CALL readHyper() override
+                { return ODataInputStream::readHyper(); }
+    virtual float SAL_CALL readFloat() override
+                { return ODataInputStream::readFloat(); }
+    virtual double SAL_CALL readDouble() override
+        { return ODataInputStream::readDouble(); }
+    virtual OUString SAL_CALL readUTF() override
+                { return ODataInputStream::readUTF(); }
+
+public: // XObjectInputStream
+        virtual Reference< XPersistObject > SAL_CALL readObject( ) override;
+
+public: // XMarkableStream
+    virtual sal_Int32 SAL_CALL createMark() override;
+    virtual void SAL_CALL deleteMark(sal_Int32 Mark) override;
+    virtual void SAL_CALL jumpToMark(sal_Int32 nMark) override;
+    virtual void SAL_CALL jumpToFurthest() override;
+    virtual sal_Int32 SAL_CALL offsetToMark(sal_Int32 nMark) override;
+
+public: // XServiceInfo
+    OUString                     SAL_CALL getImplementationName() override;
+    Sequence< OUString >         SAL_CALL getSupportedServiceNames() override;
+    sal_Bool                     SAL_CALL supportsService(const OUString& ServiceName) override;
+
+private:
+    void connectToMarkable();
+private:
+    Reference < XMultiComponentFactory > m_rSMgr;
+    Reference < XComponentContext >     m_rCxt;
+    bool                m_bValidMarkable;
+    Reference < XMarkableStream > m_rMarkable;
+    vector < Reference<  XPersistObject > > m_aPersistVector;
+
+};
+
+}
+
+Reference< XPersistObject >  OObjectInputStream::readObject()
+{
+    // check if chain contains a XMarkableStream
+    connectToMarkable();
+
+    Reference< XPersistObject > xLoadedObj;
+
+    // create Mark to skip newer versions
+    sal_uInt32 nMark = m_rMarkable->createMark();
+    // length of the data
+    sal_Int32 nLen = static_cast<sal_uInt16>(ODataInputStream::readShort());
+    if( nLen < 0xc )
+    {
+        throw WrongFormatException();
+    }
+
+    // read the object identifier
+    sal_uInt32 nId = readLong();
+
+    // the name of the persist model
+    // MM ???
+    OUString aName = readUTF();
+
+    // Read the length of the object
+    sal_Int32 nObjLen = readLong();
+    if( 0 == nId && 0 != nObjLen )
+    {
+        throw WrongFormatException();
+    }
+
+    // skip data of new version
+    skipBytes( nLen - m_rMarkable->offsetToMark( nMark ) );
+
+    bool bLoadSuccessful = true;
+    if( nId )
+    {
+        if( !aName.isEmpty() )
+        {
+            // load the object
+            Reference< XInterface > x = m_rSMgr->createInstanceWithContext( aName, m_rCxt );
+            xLoadedObj.set( x, UNO_QUERY );
+            if( xLoadedObj.is() )
+            {
+                sal_uInt32 nSize = m_aPersistVector.size();
+                if( nSize <= nId )
+                {
+                    // grow to the right size
+                    Reference< XPersistObject > xEmpty;
+                    m_aPersistVector.insert( m_aPersistVector.end(), static_cast<tools::Long>(nId - nSize + 1), xEmpty );
+                }
+
+                m_aPersistVector[nId] = xLoadedObj;
+                xLoadedObj->read( Reference< XObjectInputStream >(
+                    static_cast< XObjectInputStream * >(this) ) );
+            }
+            else
+            {
+                // no service with this name could be instantiated
+                bLoadSuccessful = false;
+            }
+        }
+        else {
+            if (nId >= m_aPersistVector.size())
+            {
+                // id unknown, load failure !
+                bLoadSuccessful = false;
+            }
+            else
+            {
+                // Object has already been read,
+                xLoadedObj = m_aPersistVector[nId];
+            }
+        }
+    }
+
+    // skip to the position behind the object
+    skipBytes( nObjLen + nLen - m_rMarkable->offsetToMark( nMark ) );
+    m_rMarkable->deleteMark( nMark );
+
+    if( ! bLoadSuccessful )
+    {
+        throw WrongFormatException();
+    }
+    return xLoadedObj;
+}
+
+
+void OObjectInputStream::connectToMarkable()
+{
+    if(  m_bValidMarkable )        return;
+
+    if( ! m_bValidStream )
+    {
+        throw NotConnectedException( );
+    }
+
+    // find the markable stream !
+    Reference< XInterface > rTry(m_input);
+    while( true ) {
+        if( ! rTry.is() )
+        {
+            throw NotConnectedException( );
+        }
+        Reference<  XMarkableStream > markable( rTry , UNO_QUERY );
+        if( markable.is() )
+        {
+            m_rMarkable = markable;
+            break;
+        }
+        Reference < XActiveDataSink > sink( rTry , UNO_QUERY );
+        rTry = sink;
+    }
+    m_bValidMarkable = true;
+}
+
+sal_Int32 OObjectInputStream::createMark()
+{
+    connectToMarkable();    // throws an exception, if a markable is not connected !
+
+    return m_rMarkable->createMark();
+}
+
+void OObjectInputStream::deleteMark(sal_Int32 Mark)
+{
+    if( ! m_bValidMarkable )
+    {
+        throw NotConnectedException();
+    }
+    m_rMarkable->deleteMark( Mark );
+}
+
+void OObjectInputStream::jumpToMark(sal_Int32 nMark)
+{
+    if( ! m_bValidMarkable )
+    {
+        throw NotConnectedException();
+    }
+    m_rMarkable->jumpToMark( nMark );
+}
+void OObjectInputStream::jumpToFurthest()
+{
+    connectToMarkable();
+    m_rMarkable->jumpToFurthest();
+}
+
+sal_Int32 OObjectInputStream::offsetToMark(sal_Int32 nMark)
+{
+    if( ! m_bValidMarkable )
+    {
+        throw NotConnectedException();
+    }
+    return m_rMarkable->offsetToMark( nMark );
+}
+
+// XServiceInfo
+OUString OObjectInputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.stm.ObjectInputStream";
+}
+
+// XServiceInfo
+sal_Bool OObjectInputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > OObjectInputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.ObjectInputStream" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OObjectInputStream_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OObjectInputStream(context));
+}
+
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/stm/omark.cxx b/io/source/stm/omark.cxx
new file mode 100644
index 000000000..3991e2c9d
--- /dev/null
+++ b/io/source/stm/omark.cxx
@@ -0,0 +1,766 @@
+/* -*- 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 <map>
+#include <memory>
+
+#include <com/sun/star/io/BufferSizeExceededException.hpp>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XMarkableStream.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XActiveDataSource.hpp>
+#include <com/sun/star/io/XActiveDataSink.hpp>
+#include <com/sun/star/io/XConnectable.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include <cppuhelper/weak.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+#include <osl/diagnose.h>
+#include <mutex>
+
+using namespace ::std;
+using namespace ::cppu;
+using namespace ::osl;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+
+#include "streamhelper.hxx"
+
+namespace io_stm {
+
+namespace {
+
+/***********************
+*
+* OMarkableOutputStream.
+*
+* This object allows to set marks in an outputstream. It is allowed to jump back to the marks and
+* rewrite the same bytes.
+*
+*         The object must buffer the data since the last mark set. Flush will not
+*         have any effect. As soon as the last mark has been removed, the object may write the data
+*         through to the chained object.
+*
+**********************/
+class OMarkableOutputStream :
+    public WeakImplHelper< XOutputStream ,
+                            XActiveDataSource ,
+                            XMarkableStream ,
+                            XConnectable,
+                            XServiceInfo
+                          >
+{
+public:
+    OMarkableOutputStream(  );
+
+public: // XOutputStream
+    virtual void SAL_CALL writeBytes(const Sequence< sal_Int8 >& aData) override;
+    virtual void SAL_CALL flush() override;
+    virtual void SAL_CALL closeOutput() override;
+
+public: // XMarkable
+    virtual sal_Int32 SAL_CALL createMark() override;
+    virtual void SAL_CALL deleteMark(sal_Int32 Mark) override;
+    virtual void SAL_CALL jumpToMark(sal_Int32 nMark) override;
+    virtual void SAL_CALL jumpToFurthest() override;
+    virtual sal_Int32 SAL_CALL offsetToMark(sal_Int32 nMark) override;
+
+public: // XActiveDataSource
+    virtual void SAL_CALL setOutputStream(const Reference < XOutputStream > & aStream) override;
+    virtual Reference < XOutputStream > SAL_CALL getOutputStream() override;
+
+public: // XConnectable
+    virtual void SAL_CALL setPredecessor(const Reference < XConnectable > & aPredecessor) override;
+    virtual Reference < XConnectable > SAL_CALL getPredecessor() override;
+    virtual void SAL_CALL setSuccessor(const Reference < XConnectable >& aSuccessor) override;
+    virtual Reference<  XConnectable >  SAL_CALL getSuccessor() override;
+
+public: // XServiceInfo
+    OUString                     SAL_CALL getImplementationName() override;
+    Sequence< OUString >         SAL_CALL getSupportedServiceNames() override;
+    sal_Bool                        SAL_CALL supportsService(const OUString& ServiceName) override;
+
+private:
+    // helper methods
+    /// @throws NotConnectedException
+    /// @throws BufferSizeExceededException
+    void checkMarksAndFlush();
+
+    Reference< XConnectable > m_succ;
+    Reference< XConnectable > m_pred;
+
+    Reference< XOutputStream >  m_output;
+    bool m_bValidStream;
+
+    std::unique_ptr<MemRingBuffer> m_pBuffer;
+    map<sal_Int32,sal_Int32,less< sal_Int32 > > m_mapMarks;
+    sal_Int32 m_nCurrentPos;
+    sal_Int32 m_nCurrentMark;
+
+    std::mutex m_mutex;
+};
+
+}
+
+OMarkableOutputStream::OMarkableOutputStream( )
+    : m_bValidStream(false)
+    , m_pBuffer( new MemRingBuffer )
+    , m_nCurrentPos(0)
+    , m_nCurrentMark(0)
+{
+}
+
+// XOutputStream
+void OMarkableOutputStream::writeBytes(const Sequence< sal_Int8 >& aData)
+{
+    if( !m_bValidStream ) {
+        throw NotConnectedException();
+    }
+    if( m_mapMarks.empty() && ( m_pBuffer->getSize() == 0 ) ) {
+        // no mark and  buffer active, simple write through
+        m_output->writeBytes( aData );
+    }
+    else {
+        std::unique_lock guard( m_mutex );
+        // new data must be buffered
+        m_pBuffer->writeAt( m_nCurrentPos , aData );
+        m_nCurrentPos += aData.getLength();
+        checkMarksAndFlush();
+    }
+
+}
+
+void OMarkableOutputStream::flush()
+{
+    Reference< XOutputStream > output;
+    {
+        std::unique_lock guard( m_mutex );
+        output = m_output;
+    }
+
+    // Markable cannot flush buffered data, because the data may get rewritten,
+    // however one can forward the flush to the chained stream to give it
+    // a chance to write data buffered in the chained stream.
+    if( output.is() )
+    {
+        output->flush();
+    }
+}
+
+void OMarkableOutputStream::closeOutput()
+{
+    if( !m_bValidStream ) {
+        throw NotConnectedException();
+    }
+    std::unique_lock guard( m_mutex );
+    // all marks must be cleared and all
+
+    m_mapMarks.clear();
+    m_nCurrentPos = m_pBuffer->getSize();
+    checkMarksAndFlush();
+
+    m_output->closeOutput();
+
+    setOutputStream( Reference< XOutputStream > () );
+    setPredecessor( Reference < XConnectable >() );
+    setSuccessor( Reference< XConnectable > () );
+
+}
+
+
+sal_Int32 OMarkableOutputStream::createMark()
+{
+    std::unique_lock guard( m_mutex );
+    sal_Int32 nMark = m_nCurrentMark;
+
+    m_mapMarks[nMark] = m_nCurrentPos;
+
+    m_nCurrentMark ++;
+    return nMark;
+}
+
+void OMarkableOutputStream::deleteMark(sal_Int32 Mark)
+{
+    std::unique_lock guard( m_mutex );
+    map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( Mark );
+
+    if( ii == m_mapMarks.end() ) {
+        throw IllegalArgumentException(
+            "MarkableOutputStream::deleteMark unknown mark (" + OUString::number(Mark) + ")",
+            *this, 0);
+    }
+    m_mapMarks.erase( ii );
+    checkMarksAndFlush();
+}
+
+void OMarkableOutputStream::jumpToMark(sal_Int32 nMark)
+{
+    std::unique_lock guard( m_mutex );
+    map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( nMark );
+
+    if( ii == m_mapMarks.end() ) {
+        throw IllegalArgumentException(
+            "MarkableOutputStream::jumpToMark unknown mark (" + OUString::number(nMark) + ")",
+            *this, 0);
+    }
+    m_nCurrentPos = (*ii).second;
+}
+
+void OMarkableOutputStream::jumpToFurthest()
+{
+    std::unique_lock guard( m_mutex );
+    m_nCurrentPos = m_pBuffer->getSize();
+    checkMarksAndFlush();
+}
+
+sal_Int32 OMarkableOutputStream::offsetToMark(sal_Int32 nMark)
+{
+
+    std::unique_lock guard( m_mutex );
+    map<sal_Int32,sal_Int32,less<sal_Int32> >::const_iterator ii = m_mapMarks.find( nMark );
+
+    if( ii == m_mapMarks.end() )
+    {
+        throw IllegalArgumentException(
+            "MarkableOutputStream::offsetToMark unknown mark (" + OUString::number(nMark) + ")",
+            *this, 0);
+    }
+    return m_nCurrentPos - (*ii).second;
+}
+
+
+// XActiveDataSource2
+void OMarkableOutputStream::setOutputStream(const Reference < XOutputStream >& aStream)
+{
+    if( m_output != aStream ) {
+        m_output = aStream;
+
+        Reference < XConnectable > succ( m_output , UNO_QUERY );
+        setSuccessor( succ );
+    }
+    m_bValidStream = m_output.is();
+}
+
+Reference< XOutputStream > OMarkableOutputStream::getOutputStream()
+{
+    return m_output;
+}
+
+
+void OMarkableOutputStream::setSuccessor( const Reference< XConnectable > &r )
+{
+     /// if the references match, nothing needs to be done
+     if( m_succ != r ) {
+         /// store the reference for later use
+         m_succ = r;
+
+         if( m_succ.is() ) {
+              m_succ->setPredecessor( Reference < XConnectable > (
+                  static_cast< XConnectable *  >(this) ) );
+         }
+     }
+}
+Reference <XConnectable > OMarkableOutputStream::getSuccessor()
+{
+    return m_succ;
+}
+
+
+// XDataSource
+void OMarkableOutputStream::setPredecessor( const Reference< XConnectable > &r )
+{
+    if( r != m_pred ) {
+        m_pred = r;
+        if( m_pred.is() ) {
+            m_pred->setSuccessor( Reference < XConnectable > (
+                static_cast< XConnectable *  >(this ) ) );
+        }
+    }
+}
+Reference < XConnectable > OMarkableOutputStream::getPredecessor()
+{
+    return m_pred;
+}
+
+
+// private methods
+
+void OMarkableOutputStream::checkMarksAndFlush()
+{
+    // find the smallest mark
+    sal_Int32 nNextFound = m_nCurrentPos;
+    for (auto const& mark : m_mapMarks)
+    {
+        if( mark.second <= nNextFound )  {
+            nNextFound = mark.second;
+        }
+    }
+
+    if( nNextFound ) {
+        // some data must be released !
+        m_nCurrentPos -= nNextFound;
+        for (auto & mark : m_mapMarks)
+        {
+            mark.second -= nNextFound;
+        }
+
+        Sequence<sal_Int8> seq(nNextFound);
+        m_pBuffer->readAt( 0 , seq , nNextFound );
+        m_pBuffer->forgetFromStart( nNextFound );
+
+        // now write data through to streams
+        m_output->writeBytes( seq );
+    }
+    else {
+        // nothing to do. There is a mark or the current cursor position, that prevents
+        // releasing data !
+    }
+}
+
+
+// XServiceInfo
+OUString OMarkableOutputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.stm.MarkableOutputStream";
+}
+
+// XServiceInfo
+sal_Bool OMarkableOutputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > OMarkableOutputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.MarkableOutputStream" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OMarkableOutputStream_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OMarkableOutputStream());
+}
+
+
+// XMarkableInputStream
+
+namespace {
+
+class OMarkableInputStream :
+    public WeakImplHelper
+    <
+             XInputStream,
+             XActiveDataSink,
+             XMarkableStream,
+             XConnectable,
+             XServiceInfo
+    >
+{
+public:
+    OMarkableInputStream(  );
+
+
+public: // XInputStream
+    virtual sal_Int32 SAL_CALL readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead) override ;
+    virtual sal_Int32 SAL_CALL readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead) override;
+    virtual void SAL_CALL skipBytes(sal_Int32 nBytesToSkip) override;
+
+    virtual sal_Int32 SAL_CALL available() override;
+    virtual void SAL_CALL closeInput() override;
+
+public: // XMarkable
+    virtual sal_Int32 SAL_CALL createMark() override;
+    virtual void SAL_CALL deleteMark(sal_Int32 Mark) override;
+    virtual void SAL_CALL jumpToMark(sal_Int32 nMark) override;
+    virtual void SAL_CALL jumpToFurthest() override;
+    virtual sal_Int32 SAL_CALL offsetToMark(sal_Int32 nMark) override;
+
+public: // XActiveDataSink
+    virtual void SAL_CALL setInputStream(const Reference < XInputStream > & aStream) override;
+    virtual Reference < XInputStream > SAL_CALL getInputStream() override;
+
+public: // XConnectable
+    virtual void SAL_CALL setPredecessor(const Reference < XConnectable > & aPredecessor) override;
+    virtual Reference < XConnectable > SAL_CALL getPredecessor() override;
+    virtual void SAL_CALL setSuccessor(const Reference < XConnectable > & aSuccessor) override;
+    virtual Reference < XConnectable > SAL_CALL getSuccessor() override;
+
+public: // XServiceInfo
+    OUString                     SAL_CALL getImplementationName() override;
+    Sequence< OUString >         SAL_CALL getSupportedServiceNames() override;
+    sal_Bool                         SAL_CALL  supportsService(const OUString& ServiceName) override;
+
+private:
+    void checkMarksAndFlush();
+
+    Reference < XConnectable >  m_succ;
+    Reference < XConnectable >  m_pred;
+
+    Reference< XInputStream > m_input;
+    bool m_bValidStream;
+
+    std::unique_ptr<MemRingBuffer> m_pBuffer;
+    map<sal_Int32,sal_Int32,less< sal_Int32 > > m_mapMarks;
+    sal_Int32 m_nCurrentPos;
+    sal_Int32 m_nCurrentMark;
+
+    std::mutex m_mutex;
+};
+
+}
+
+OMarkableInputStream::OMarkableInputStream()
+    : m_bValidStream(false)
+    , m_nCurrentPos(0)
+    , m_nCurrentMark(0)
+{
+    m_pBuffer.reset( new MemRingBuffer );
+}
+
+
+// XInputStream
+
+sal_Int32 OMarkableInputStream::readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead)
+{
+    sal_Int32 nBytesRead;
+
+    if( !m_bValidStream ) {
+        throw NotConnectedException(
+            "MarkableInputStream::readBytes NotConnectedException",
+            *this );
+    }
+    std::unique_lock guard( m_mutex );
+    if( m_mapMarks.empty() && ! m_pBuffer->getSize() ) {
+        // normal read !
+        nBytesRead = m_input->readBytes( aData, nBytesToRead );
+    }
+    else {
+        // read from buffer
+        sal_Int32 nRead;
+
+        // read enough bytes into buffer
+        if( m_pBuffer->getSize() - m_nCurrentPos < nBytesToRead  ) {
+            sal_Int32 nToRead = nBytesToRead - ( m_pBuffer->getSize() - m_nCurrentPos );
+            nRead = m_input->readBytes( aData , nToRead );
+
+            OSL_ASSERT( aData.getLength() == nRead );
+
+            m_pBuffer->writeAt( m_pBuffer->getSize() , aData );
+
+            if( nRead < nToRead ) {
+                nBytesToRead = nBytesToRead - (nToRead-nRead);
+            }
+        }
+
+        OSL_ASSERT( m_pBuffer->getSize() - m_nCurrentPos >= nBytesToRead  );
+
+        m_pBuffer->readAt( m_nCurrentPos , aData , nBytesToRead );
+
+        m_nCurrentPos += nBytesToRead;
+        nBytesRead = nBytesToRead;
+    }
+
+    return nBytesRead;
+}
+
+
+sal_Int32 OMarkableInputStream::readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead)
+{
+
+    sal_Int32 nBytesRead;
+    if( !m_bValidStream )    {
+        throw NotConnectedException(
+            "MarkableInputStream::readSomeBytes NotConnectedException",
+            *this );
+    }
+
+    std::unique_lock guard( m_mutex );
+    if( m_mapMarks.empty() && ! m_pBuffer->getSize() ) {
+        // normal read !
+        nBytesRead = m_input->readSomeBytes( aData, nMaxBytesToRead );
+    }
+    else {
+        // read from buffer
+        sal_Int32 nRead = 0;
+        sal_Int32 nInBuffer = m_pBuffer->getSize() - m_nCurrentPos;
+        sal_Int32 nAdditionalBytesToRead = std::min<sal_Int32>(nMaxBytesToRead-nInBuffer,m_input->available());
+        nAdditionalBytesToRead = std::max<sal_Int32>(0 , nAdditionalBytesToRead );
+
+        // read enough bytes into buffer
+        if( 0 == nInBuffer ) {
+            nRead = m_input->readSomeBytes( aData , nMaxBytesToRead );
+        }
+        else if( nAdditionalBytesToRead ) {
+            nRead = m_input->readBytes( aData , nAdditionalBytesToRead );
+        }
+
+        if( nRead ) {
+            aData.realloc( nRead );
+            m_pBuffer->writeAt( m_pBuffer->getSize() , aData );
+        }
+
+        nBytesRead = std::min( nMaxBytesToRead , nInBuffer + nRead );
+
+        // now take everything from buffer !
+        m_pBuffer->readAt( m_nCurrentPos , aData , nBytesRead );
+
+        m_nCurrentPos += nBytesRead;
+    }
+
+    return nBytesRead;
+
+
+}
+
+
+void OMarkableInputStream::skipBytes(sal_Int32 nBytesToSkip)
+{
+    if ( nBytesToSkip < 0 )
+        throw BufferSizeExceededException(
+            "precondition not met: XInputStream::skipBytes: non-negative integer required!",
+            *this
+        );
+
+    // this method is blocking
+    Sequence<sal_Int8> seqDummy( nBytesToSkip );
+    readBytes( seqDummy , nBytesToSkip );
+}
+
+sal_Int32 OMarkableInputStream::available()
+{
+    if( !m_bValidStream )    {
+        throw NotConnectedException(
+            "MarkableInputStream::available NotConnectedException",
+            *this );
+    }
+
+    std::unique_lock guard( m_mutex );
+    sal_Int32 nAvail = m_input->available() + ( m_pBuffer->getSize() - m_nCurrentPos );
+    return nAvail;
+}
+
+
+void OMarkableInputStream::closeInput()
+{
+    if( !m_bValidStream ) {
+        throw NotConnectedException(
+            "MarkableInputStream::closeInput NotConnectedException",
+            *this );
+    }
+    std::unique_lock guard( m_mutex );
+
+    m_input->closeInput();
+
+    setInputStream( Reference< XInputStream > () );
+    setPredecessor( Reference< XConnectable > () );
+    setSuccessor( Reference< XConnectable >() );
+
+    m_pBuffer.reset();
+    m_nCurrentPos = 0;
+    m_nCurrentMark = 0;
+}
+
+// XMarkable
+
+sal_Int32 OMarkableInputStream::createMark()
+{
+    std::unique_lock guard( m_mutex );
+    sal_Int32 nMark = m_nCurrentMark;
+
+    m_mapMarks[nMark] = m_nCurrentPos;
+
+    m_nCurrentMark ++;
+    return nMark;
+}
+
+void OMarkableInputStream::deleteMark(sal_Int32 Mark)
+{
+    std::unique_lock guard( m_mutex );
+    map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( Mark );
+
+    if( ii == m_mapMarks.end() ) {
+        throw IllegalArgumentException(
+            "MarkableInputStream::deleteMark unknown mark (" + OUString::number(Mark) + ")",
+            *this , 0 );
+    }
+    m_mapMarks.erase( ii );
+    checkMarksAndFlush();
+}
+
+void OMarkableInputStream::jumpToMark(sal_Int32 nMark)
+{
+    std::unique_lock guard( m_mutex );
+    map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( nMark );
+
+    if( ii == m_mapMarks.end() )
+    {
+        throw IllegalArgumentException(
+            "MarkableInputStream::jumpToMark unknown mark (" + OUString::number(nMark) + ")",
+            *this , 0 );
+    }
+    m_nCurrentPos = (*ii).second;
+}
+
+void OMarkableInputStream::jumpToFurthest()
+{
+    std::unique_lock guard( m_mutex );
+    m_nCurrentPos = m_pBuffer->getSize();
+    checkMarksAndFlush();
+}
+
+sal_Int32 OMarkableInputStream::offsetToMark(sal_Int32 nMark)
+{
+    std::unique_lock guard( m_mutex );
+    map<sal_Int32,sal_Int32,less<sal_Int32> >::const_iterator ii = m_mapMarks.find( nMark );
+
+    if( ii == m_mapMarks.end() )
+    {
+        throw IllegalArgumentException(
+            "MarkableInputStream::offsetToMark unknown mark (" + OUString::number(nMark) + ")",
+            *this, 0 );
+    }
+    return m_nCurrentPos - (*ii).second;
+}
+
+
+// XActiveDataSource
+void OMarkableInputStream::setInputStream(const Reference< XInputStream > & aStream)
+{
+
+    if( m_input != aStream ) {
+        m_input = aStream;
+
+        Reference < XConnectable >  pred( m_input , UNO_QUERY );
+        setPredecessor( pred );
+    }
+
+    m_bValidStream = m_input.is();
+
+}
+
+Reference< XInputStream > OMarkableInputStream::getInputStream()
+{
+    return m_input;
+}
+
+
+// XDataSink
+void OMarkableInputStream::setSuccessor( const Reference< XConnectable > &r )
+{
+     /// if the references match, nothing needs to be done
+     if( m_succ != r ) {
+         /// store the reference for later use
+         m_succ = r;
+
+         if( m_succ.is() ) {
+              /// set this instance as the sink !
+              m_succ->setPredecessor( Reference< XConnectable > (
+                  static_cast< XConnectable * >(this) ) );
+         }
+     }
+}
+
+Reference < XConnectable >  OMarkableInputStream::getSuccessor()
+{
+    return m_succ;
+}
+
+
+// XDataSource
+void OMarkableInputStream::setPredecessor( const Reference < XConnectable >  &r )
+{
+    if( r != m_pred ) {
+        m_pred = r;
+        if( m_pred.is() ) {
+            m_pred->setSuccessor( Reference< XConnectable > (
+                static_cast< XConnectable * >(this) ) );
+        }
+    }
+}
+Reference< XConnectable >  OMarkableInputStream::getPredecessor()
+{
+    return m_pred;
+}
+
+
+void OMarkableInputStream::checkMarksAndFlush()
+{
+    // find the smallest mark
+    sal_Int32 nNextFound = m_nCurrentPos;
+    for (auto const& mark : m_mapMarks)
+    {
+        if( mark.second <= nNextFound )  {
+            nNextFound = mark.second;
+        }
+    }
+
+    if( nNextFound ) {
+        // some data must be released !
+        m_nCurrentPos -= nNextFound;
+        for (auto & mark : m_mapMarks)
+        {
+            mark.second -= nNextFound;
+        }
+
+        m_pBuffer->forgetFromStart( nNextFound );
+
+    }
+    else {
+        // nothing to do. There is a mark or the current cursor position, that prevents
+        // releasing data !
+    }
+}
+
+// XServiceInfo
+OUString OMarkableInputStream::getImplementationName()
+{
+    return "com.sun.star.comp.io.stm.MarkableInputStream";
+}
+
+// XServiceInfo
+sal_Bool OMarkableInputStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > OMarkableInputStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.MarkableInputStream" };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OMarkableInputStream_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new OMarkableInputStream());
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/stm/opipe.cxx b/io/source/stm/opipe.cxx
new file mode 100644
index 000000000..07e203bf0
--- /dev/null
+++ b/io/source/stm/opipe.cxx
@@ -0,0 +1,357 @@
+/* -*- 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/io/BufferSizeExceededException.hpp>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XPipe.hpp>
+#include <com/sun/star/io/XConnectable.hpp>
+
+#include <com/sun/star/lang/XServiceInfo.hpp>
+
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+
+#include <osl/conditn.hxx>
+#include <osl/mutex.hxx>
+
+#include <limits>
+#include <memory>
+#include <string.h>
+
+using namespace ::osl;
+using namespace ::cppu;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::lang;
+
+#include "streamhelper.hxx"
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace io_stm{
+
+namespace {
+
+class OPipeImpl :
+    public WeakImplHelper< XPipe , XConnectable , XServiceInfo >
+{
+public:
+    OPipeImpl( );
+
+public: // XInputStream
+    virtual sal_Int32 SAL_CALL readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead) override;
+    virtual sal_Int32 SAL_CALL readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead) override;
+    virtual void SAL_CALL skipBytes(sal_Int32 nBytesToSkip) override;
+    virtual sal_Int32 SAL_CALL available() override;
+    virtual void SAL_CALL closeInput() override;
+
+public: // XOutputStream
+
+    virtual void SAL_CALL writeBytes(const Sequence< sal_Int8 >& aData) override;
+    virtual void SAL_CALL flush() override;
+    virtual void SAL_CALL closeOutput() override;
+
+public: // XConnectable
+    virtual void SAL_CALL setPredecessor(const Reference< XConnectable >& aPredecessor) override;
+    virtual Reference< XConnectable > SAL_CALL getPredecessor() override;
+    virtual void SAL_CALL setSuccessor(const Reference < XConnectable > & aSuccessor) override;
+    virtual Reference < XConnectable > SAL_CALL getSuccessor() override ;
+
+
+public: // XServiceInfo
+    OUString                    SAL_CALL getImplementationName() override;
+    Sequence< OUString >         SAL_CALL getSupportedServiceNames() override;
+    sal_Bool                        SAL_CALL supportsService(const OUString& ServiceName) override;
+
+private:
+
+    Reference < XConnectable >  m_succ;
+    Reference < XConnectable >  m_pred;
+
+    sal_Int32 m_nBytesToSkip;
+
+    bool m_bOutputStreamClosed;
+    bool m_bInputStreamClosed;
+
+    osl::Condition m_conditionBytesAvail;
+    Mutex          m_mutexAccess;
+    std::unique_ptr<MemFIFO> m_pFIFO;
+};
+
+}
+
+OPipeImpl::OPipeImpl()
+    : m_nBytesToSkip(0 )
+    , m_bOutputStreamClosed(false )
+    , m_bInputStreamClosed( false )
+    , m_pFIFO( new MemFIFO )
+{
+}
+
+
+
+sal_Int32 OPipeImpl::readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead)
+{
+    while( true )
+    {
+        { // start guarded section
+            MutexGuard guard( m_mutexAccess );
+            if( m_bInputStreamClosed )
+            {
+                throw NotConnectedException(
+                    "Pipe::readBytes NotConnectedException",
+                    *this );
+            }
+            sal_Int32 nOccupiedBufferLen = m_pFIFO->getSize();
+
+            if( m_bOutputStreamClosed && nBytesToRead > nOccupiedBufferLen )
+            {
+                nBytesToRead = nOccupiedBufferLen;
+            }
+
+            if( nOccupiedBufferLen < nBytesToRead )
+            {
+                // wait outside guarded section
+                m_conditionBytesAvail.reset();
+            }
+            else {
+                // necessary bytes are available
+                m_pFIFO->read( aData , nBytesToRead );
+                return nBytesToRead;
+            }
+        } // end guarded section
+
+        // wait for new data outside guarded section!
+        m_conditionBytesAvail.wait();
+    }
+}
+
+
+sal_Int32 OPipeImpl::readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead)
+{
+    while( true ) {
+        {
+            MutexGuard guard( m_mutexAccess );
+            if( m_bInputStreamClosed )
+            {
+                throw NotConnectedException(
+                    "Pipe::readSomeBytes NotConnectedException",
+                    *this );
+            }
+            if( m_pFIFO->getSize() )
+            {
+                sal_Int32 nSize = std::min( nMaxBytesToRead , m_pFIFO->getSize() );
+                aData.realloc( nSize );
+                m_pFIFO->read( aData , nSize );
+                return nSize;
+            }
+
+            if( m_bOutputStreamClosed )
+            {
+                // no bytes in buffer anymore
+                return 0;
+            }
+        }
+
+        m_conditionBytesAvail.wait();
+    }
+}
+
+
+void OPipeImpl::skipBytes(sal_Int32 nBytesToSkip)
+{
+    MutexGuard guard( m_mutexAccess );
+    if( m_bInputStreamClosed )
+    {
+        throw NotConnectedException(
+            "Pipe::skipBytes NotConnectedException",
+            *this );
+    }
+
+    if( nBytesToSkip < 0
+        || (nBytesToSkip
+            > std::numeric_limits< sal_Int32 >::max() - m_nBytesToSkip) )
+    {
+        throw BufferSizeExceededException(
+            "Pipe::skipBytes BufferSizeExceededException",
+            *this );
+    }
+    m_nBytesToSkip += nBytesToSkip;
+
+    nBytesToSkip = std::min( m_pFIFO->getSize() , m_nBytesToSkip );
+    m_pFIFO->skip( nBytesToSkip );
+    m_nBytesToSkip -= nBytesToSkip;
+}
+
+
+sal_Int32 OPipeImpl::available()
+ {
+    MutexGuard guard( m_mutexAccess );
+    if( m_bInputStreamClosed )
+    {
+        throw NotConnectedException(
+            "Pipe::available NotConnectedException",
+            *this );
+    }
+    return m_pFIFO->getSize();
+}
+
+void OPipeImpl::closeInput()
+{
+    MutexGuard guard( m_mutexAccess );
+
+    m_bInputStreamClosed = true;
+
+    m_pFIFO.reset();
+
+    // readBytes may throw an exception
+    m_conditionBytesAvail.set();
+
+    setSuccessor( Reference< XConnectable > () );
+}
+
+
+void OPipeImpl::writeBytes(const Sequence< sal_Int8 >& aData)
+{
+    MutexGuard guard( m_mutexAccess );
+
+    if( m_bOutputStreamClosed )
+    {
+        throw NotConnectedException(
+            "Pipe::writeBytes NotConnectedException (outputstream)",
+            *this );
+    }
+
+    if( m_bInputStreamClosed )
+    {
+        throw NotConnectedException(
+            "Pipe::writeBytes NotConnectedException (inputstream)",
+            *this );
+    }
+
+    // check skipping
+    sal_Int32 nLen = aData.getLength();
+    if( m_nBytesToSkip  && m_nBytesToSkip >= nLen  ) {
+        // all must be skipped - forget whole call
+        m_nBytesToSkip -= nLen;
+        return;
+    }
+
+    // adjust buffersize if necessary
+    if( m_nBytesToSkip )
+    {
+        Sequence< sal_Int8 > seqCopy( nLen - m_nBytesToSkip );
+        memcpy( seqCopy.getArray() , &( aData.getConstArray()[m_nBytesToSkip] ) , nLen-m_nBytesToSkip );
+        m_pFIFO->write( seqCopy );
+    }
+    else
+    {
+        m_pFIFO->write( aData );
+    }
+    m_nBytesToSkip = 0;
+
+    // readBytes may check again if enough bytes are available
+    m_conditionBytesAvail.set();
+}
+
+
+void OPipeImpl::flush()
+{
+    // nothing to do for a pipe
+}
+
+void OPipeImpl::closeOutput()
+{
+    MutexGuard guard( m_mutexAccess );
+
+    m_bOutputStreamClosed = true;
+    m_conditionBytesAvail.set();
+    setPredecessor( Reference < XConnectable > () );
+}
+
+
+void OPipeImpl::setSuccessor( const Reference < XConnectable >  &r )
+{
+     /// if the references match, nothing needs to be done
+     if( m_succ != r ) {
+         /// store the reference for later use
+         m_succ = r;
+
+         if( m_succ.is() )
+         {
+              m_succ->setPredecessor(
+                  Reference< XConnectable > ( static_cast< XConnectable * >(this) ) );
+         }
+     }
+}
+
+Reference < XConnectable > OPipeImpl::getSuccessor()
+{
+    return m_succ;
+}
+
+
+// XDataSource
+void OPipeImpl::setPredecessor( const Reference < XConnectable > &r )
+{
+    if( r != m_pred ) {
+        m_pred = r;
+        if( m_pred.is() ) {
+            m_pred->setSuccessor(
+                Reference < XConnectable > ( static_cast< XConnectable * >(this) ) );
+        }
+    }
+}
+
+Reference < XConnectable > OPipeImpl::getPredecessor()
+{
+    return m_pred;
+}
+
+
+// XServiceInfo
+OUString OPipeImpl::getImplementationName()
+{
+    return "com.sun.star.comp.io.stm.Pipe";
+}
+
+// XServiceInfo
+sal_Bool OPipeImpl::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > OPipeImpl::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.Pipe" };
+}
+
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_OPipeImpl_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new io_stm::OPipeImpl());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/stm/opump.cxx b/io/source/stm/opump.cxx
new file mode 100644
index 000000000..fc751b677
--- /dev/null
+++ b/io/source/stm/opump.cxx
@@ -0,0 +1,455 @@
+/* -*- 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 <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XActiveDataSource.hpp>
+#include <com/sun/star/io/XActiveDataSink.hpp>
+#include <com/sun/star/io/XActiveDataControl.hpp>
+#include <com/sun/star/io/XConnectable.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include <cppuhelper/implbase.hxx>
+#include <comphelper/interfacecontainer4.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <osl/thread.h>
+#include <mutex>
+
+using namespace osl;
+using namespace cppu;
+using namespace com::sun::star::uno;
+using namespace com::sun::star::lang;
+using namespace com::sun::star::io;
+
+namespace io_stm {
+
+    namespace {
+
+    class Pump : public WeakImplHelper<
+          XActiveDataSource, XActiveDataSink, XActiveDataControl, XConnectable, XServiceInfo >
+    {
+        std::mutex                              m_aMutex;
+        oslThread                               m_aThread;
+
+        Reference< XConnectable >               m_xPred;
+        Reference< XConnectable >               m_xSucc;
+        Reference< XInputStream >               m_xInput;
+        Reference< XOutputStream >              m_xOutput;
+        comphelper::OInterfaceContainerHelper4<XStreamListener>  m_cnt;
+        bool                                m_closeFired;
+
+        void run();
+        static void static_run( void* pObject );
+
+        void close();
+        void fireClose();
+        void fireStarted();
+        void fireTerminated();
+        void fireError( const Any &a );
+
+    public:
+        Pump();
+        virtual ~Pump() override;
+
+        // XActiveDataSource
+        virtual void SAL_CALL setOutputStream( const Reference< css::io::XOutputStream >& xOutput ) override;
+        virtual Reference< css::io::XOutputStream > SAL_CALL getOutputStream() override;
+
+        // XActiveDataSink
+        virtual void SAL_CALL setInputStream( const Reference< css::io::XInputStream >& xStream ) override;
+        virtual Reference< css::io::XInputStream > SAL_CALL getInputStream() override;
+
+        // XActiveDataControl
+        virtual void SAL_CALL addListener( const Reference< css::io::XStreamListener >& xListener ) override;
+        virtual void SAL_CALL removeListener( const Reference< css::io::XStreamListener >& xListener ) override;
+        virtual void SAL_CALL start() override;
+        virtual void SAL_CALL terminate() override;
+
+        // XConnectable
+        virtual void SAL_CALL setPredecessor( const Reference< css::io::XConnectable >& xPred ) override;
+        virtual Reference< css::io::XConnectable > SAL_CALL getPredecessor() override;
+        virtual void SAL_CALL setSuccessor( const Reference< css::io::XConnectable >& xSucc ) override;
+        virtual Reference< css::io::XConnectable > SAL_CALL getSuccessor() override;
+
+    public: // XServiceInfo
+        virtual OUString    SAL_CALL getImplementationName() override;
+        virtual Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+        virtual sal_Bool     SAL_CALL supportsService(const OUString& ServiceName) override;
+    };
+
+    }
+
+Pump::Pump() : m_aThread( nullptr ),
+               m_closeFired( false )
+{
+}
+
+Pump::~Pump()
+{
+    // exit gracefully
+    if( m_aThread )
+    {
+        osl_joinWithThread( m_aThread );
+        osl_destroyThread( m_aThread );
+    }
+}
+
+void Pump::fireError( const  Any & exception )
+{
+    std::unique_lock guard( m_aMutex );
+    comphelper::OInterfaceIteratorHelper4<XStreamListener> iter( guard, m_cnt );
+    guard.unlock();
+    while( iter.hasMoreElements() )
+    {
+        try
+        {
+            iter.next()->error( exception );
+        }
+        catch ( const RuntimeException &e )
+        {
+            SAL_WARN("io.streams","com.sun.star.comp.stoc.Pump: unexpected exception during calling listeners" << e);
+        }
+    }
+}
+
+void Pump::fireClose()
+{
+    bool bFire = false;
+    {
+        std::unique_lock guard( m_aMutex );
+        if( ! m_closeFired  )
+        {
+            m_closeFired = true;
+            bFire = true;
+        }
+    }
+
+    if( !bFire )
+        return;
+
+    std::unique_lock guard( m_aMutex );
+    comphelper::OInterfaceIteratorHelper4<XStreamListener> iter( guard, m_cnt );
+    guard.unlock();
+    while( iter.hasMoreElements() )
+    {
+        try
+        {
+            iter.next()->closed( );
+        }
+        catch ( const RuntimeException &e )
+        {
+            SAL_WARN("io.streams","com.sun.star.comp.stoc.Pump: unexpected exception during calling listeners" << e);
+        }
+    }
+}
+
+void Pump::fireStarted()
+{
+    std::unique_lock guard( m_aMutex );
+    comphelper::OInterfaceIteratorHelper4<XStreamListener> iter( guard, m_cnt );
+    guard.unlock();
+    while( iter.hasMoreElements() )
+    {
+        try
+        {
+            iter.next()->started( );
+        }
+        catch ( const RuntimeException &e )
+        {
+            SAL_WARN("io.streams","com.sun.star.comp.stoc.Pump: unexpected exception during calling listeners" << e);
+        }
+    }
+}
+
+void Pump::fireTerminated()
+{
+    std::unique_lock guard( m_aMutex );
+    comphelper::OInterfaceIteratorHelper4<XStreamListener> iter( guard, m_cnt );
+    guard.unlock();
+    while( iter.hasMoreElements() )
+    {
+        try
+        {
+            iter.next()->terminated();
+        }
+        catch ( const RuntimeException &e )
+        {
+            SAL_WARN("io.streams","com.sun.star.comp.stoc.Pump: unexpected exception during calling listeners" << e);
+        }
+    }
+}
+
+
+void Pump::close()
+{
+    // close streams and release references
+    Reference< XInputStream > rInput;
+    Reference< XOutputStream > rOutput;
+    {
+        std::unique_lock guard( m_aMutex );
+        rInput = m_xInput;
+        m_xInput.clear();
+
+        rOutput = m_xOutput;
+        m_xOutput.clear();
+        m_xSucc.clear();
+        m_xPred.clear();
+    }
+    if( rInput.is() )
+    {
+        try
+        {
+            rInput->closeInput();
+        }
+        catch( Exception & )
+        {
+            // go down calm
+        }
+    }
+    if( rOutput.is() )
+    {
+        try
+        {
+            rOutput->closeOutput();
+        }
+        catch( Exception & )
+        {
+            // go down calm
+        }
+    }
+}
+
+void Pump::static_run( void* pObject )
+{
+    osl_setThreadName("io_stm::Pump::run()");
+    static_cast<Pump*>(pObject)->run();
+    static_cast<Pump*>(pObject)->release();
+}
+
+void Pump::run()
+{
+    try
+    {
+        fireStarted();
+        try
+        {
+            Reference< XInputStream > rInput;
+            Reference< XOutputStream > rOutput;
+            {
+                std::unique_lock aGuard( m_aMutex );
+                rInput = m_xInput;
+                rOutput = m_xOutput;
+            }
+
+            if( ! rInput.is() )
+            {
+                throw NotConnectedException( "no input stream set", static_cast<OWeakObject*>(this) );
+            }
+            Sequence< sal_Int8 > aData;
+            while( rInput->readSomeBytes( aData, 65536 ) )
+            {
+                if( ! rOutput.is() )
+                {
+                    throw NotConnectedException( "no output stream set", static_cast<OWeakObject*>(this) );
+                }
+                rOutput->writeBytes( aData );
+                osl_yieldThread();
+            }
+        }
+        catch ( const IOException & e )
+        {
+            fireError( Any( e ) );
+        }
+        catch ( const RuntimeException & e )
+        {
+            fireError( Any( e ) );
+        }
+        catch ( const Exception & e )
+        {
+            fireError( Any( e ) );
+        }
+
+        close();
+        fireClose();
+    }
+    catch ( const css::uno::Exception &e )
+    {
+        // we are the last on the stack.
+        // this is to avoid crashing the program, when e.g. a bridge crashes
+        SAL_WARN("io.streams","com.sun.star.comp.stoc.Pump: unexpected exception during calling listeners" << e);
+    }
+}
+
+
+/*
+ * XConnectable
+ */
+
+void Pump::setPredecessor( const Reference< XConnectable >& xPred )
+{
+    std::unique_lock aGuard( m_aMutex );
+    m_xPred = xPred;
+}
+
+
+Reference< XConnectable > Pump::getPredecessor()
+{
+    std::unique_lock aGuard( m_aMutex );
+    return m_xPred;
+}
+
+
+void Pump::setSuccessor( const Reference< XConnectable >& xSucc )
+{
+    std::unique_lock aGuard( m_aMutex );
+    m_xSucc = xSucc;
+}
+
+
+Reference< XConnectable > Pump::getSuccessor()
+{
+    std::unique_lock aGuard( m_aMutex );
+    return m_xSucc;
+}
+
+
+/*
+ * XActiveDataControl
+ */
+
+void Pump::addListener( const Reference< XStreamListener >& xListener )
+{
+    std::unique_lock aGuard( m_aMutex );
+    m_cnt.addInterface( aGuard, xListener );
+}
+
+
+void Pump::removeListener( const Reference< XStreamListener >& xListener )
+{
+    std::unique_lock aGuard( m_aMutex );
+    m_cnt.removeInterface( aGuard, xListener );
+}
+
+
+void Pump::start()
+{
+    std::unique_lock aGuard( m_aMutex );
+    m_aThread = osl_createSuspendedThread(Pump::static_run,this);
+    if( !m_aThread )
+    {
+        throw RuntimeException(
+            "Pump::start Couldn't create worker thread",
+            *this);
+    }
+
+    // will be released by OPump::static_run
+    acquire();
+    osl_resumeThread( m_aThread );
+
+}
+
+
+void Pump::terminate()
+{
+    close();
+
+    // wait for the worker to die
+    if( m_aThread )
+        osl_joinWithThread( m_aThread );
+
+    fireTerminated();
+    fireClose();
+}
+
+
+/*
+ * XActiveDataSink
+ */
+
+void Pump::setInputStream( const Reference< XInputStream >& xStream )
+{
+    std::unique_lock aGuard( m_aMutex );
+    m_xInput = xStream;
+    Reference< XConnectable > xConnect( xStream, UNO_QUERY );
+    if( xConnect.is() )
+        xConnect->setSuccessor( this );
+    // data transfer starts in XActiveDataControl::start
+}
+
+
+Reference< XInputStream > Pump::getInputStream()
+{
+    std::unique_lock aGuard( m_aMutex );
+    return m_xInput;
+}
+
+
+/*
+ * XActiveDataSource
+ */
+
+void Pump::setOutputStream( const Reference< XOutputStream >& xOut )
+{
+    std::unique_lock aGuard( m_aMutex );
+    m_xOutput = xOut;
+    Reference< XConnectable > xConnect( xOut, UNO_QUERY );
+    if( xConnect.is() )
+        xConnect->setPredecessor( this );
+    // data transfer starts in XActiveDataControl::start
+}
+
+Reference< XOutputStream > Pump::getOutputStream()
+{
+    std::unique_lock aGuard( m_aMutex );
+    return m_xOutput;
+}
+
+// XServiceInfo
+OUString Pump::getImplementationName()
+{
+    return "com.sun.star.comp.io.Pump";
+}
+
+// XServiceInfo
+sal_Bool Pump::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+// XServiceInfo
+Sequence< OUString > Pump::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.Pump" };
+}
+
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+io_Pump_get_implementation(
+    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
+{
+    return cppu::acquire(new io_stm::Pump());
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/stm/streamhelper.cxx b/io/source/stm/streamhelper.cxx
new file mode 100644
index 000000000..0933ac966
--- /dev/null
+++ b/io/source/stm/streamhelper.cxx
@@ -0,0 +1,173 @@
+/* -*- 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 <limits>
+#include <string.h>
+
+#include <com/sun/star/uno/Sequence.hxx>
+
+#include <com/sun/star/io/BufferSizeExceededException.hpp>
+
+using namespace ::com::sun::star::uno;
+
+#include "streamhelper.hxx"
+
+namespace io_stm {
+
+void MemFIFO::write( const Sequence< sal_Int8 > &seq )
+{
+    writeAt(getSize(), seq);
+}
+
+void MemFIFO::read( Sequence<sal_Int8> &seq , sal_Int32 nBufferLen )
+{
+    readAt(0, seq , nBufferLen);
+    forgetFromStart( nBufferLen );
+}
+
+void MemFIFO::skip( sal_Int32 nBytesToSkip )
+{
+    forgetFromStart( nBytesToSkip );
+}
+
+MemRingBuffer::MemRingBuffer() : m_p(nullptr), m_nBufferLen(0), m_nStart(0), m_nOccupiedBuffer(0)
+{
+}
+
+MemRingBuffer::~MemRingBuffer()
+{
+    std::free( m_p );
+}
+
+void MemRingBuffer::resizeBuffer( sal_Int32 nMinSize )
+{
+    sal_Int32 nNewLen = 1;
+
+    while( nMinSize > nNewLen ) {
+        nNewLen = nNewLen << 1;
+    }
+
+    // buffer never shrinks !
+    if( nNewLen < m_nBufferLen ) {
+        nNewLen = m_nBufferLen;
+    }
+
+    if( nNewLen == m_nBufferLen )
+        return;
+
+    auto p = static_cast<sal_Int8*>(std::realloc(m_p, nNewLen));
+    if (!p)
+        throw css::io::BufferSizeExceededException(
+            "MemRingBuffer::resizeBuffer BufferSizeExceededException");
+
+    m_p = p;
+
+
+    if( m_nStart + m_nOccupiedBuffer > m_nBufferLen ) {
+        memmove( &( m_p[m_nStart+(nNewLen-m_nBufferLen)]) , &(m_p[m_nStart]) , m_nBufferLen - m_nStart );
+        m_nStart += nNewLen - m_nBufferLen;
+    }
+    m_nBufferLen = nNewLen;
+}
+
+
+void MemRingBuffer::readAt( sal_Int32 nPos, Sequence<sal_Int8> &seq , sal_Int32 nBytesToRead ) const
+{
+    if( nPos + nBytesToRead > m_nOccupiedBuffer ) {
+        throw css::io::BufferSizeExceededException(
+            "MemRingBuffer::readAt BufferSizeExceededException");
+    }
+
+    sal_Int32 nStartReadingPos = nPos + m_nStart;
+    if( nStartReadingPos >= m_nBufferLen ) {
+        nStartReadingPos -= m_nBufferLen;
+    }
+
+    seq.realloc( nBytesToRead );
+
+    if( nStartReadingPos + nBytesToRead > m_nBufferLen ) {
+        sal_Int32 nDeltaLen = m_nBufferLen - nStartReadingPos;
+        memcpy( seq.getArray() , &(m_p[nStartReadingPos]) , nDeltaLen );
+        memcpy( &(seq.getArray()[nDeltaLen]), m_p , nBytesToRead - nDeltaLen );
+    }
+    else {
+        memcpy( seq.getArray() , &(m_p[nStartReadingPos]) , nBytesToRead );
+    }
+}
+
+
+void MemRingBuffer::writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &seq )
+{
+    checkInvariants();
+    const sal_Int32 nLen = seq.getLength();
+
+    if( nPos < 0 || nPos > std::numeric_limits< sal_Int32 >::max() - nLen )
+    {
+        throw css::io::BufferSizeExceededException(
+            "MemRingBuffer::writeAt BufferSizeExceededException");
+    }
+
+    if( nPos + nLen - m_nOccupiedBuffer > 0 ) {
+        resizeBuffer( nPos + nLen );
+        m_nOccupiedBuffer = nPos + nLen;
+    }
+
+    sal_Int32 nStartWritingIndex = m_nStart + nPos;
+    if( nStartWritingIndex >= m_nBufferLen ) {
+        nStartWritingIndex -= m_nBufferLen;
+    }
+
+    if( const sal_Int32 nBufferRestLen = m_nBufferLen-nStartWritingIndex; nLen > nBufferRestLen ) {
+        // two area copy
+        memcpy( &(m_p[nStartWritingIndex]) , seq.getConstArray(), nBufferRestLen );
+        memcpy( m_p , &( seq.getConstArray()[nBufferRestLen] ), nLen - nBufferRestLen );
+
+    }
+    else {
+        // one area copy
+        memcpy( &( m_p[nStartWritingIndex]), seq.getConstArray() , nLen );
+    }
+    checkInvariants();
+}
+
+
+sal_Int32 MemRingBuffer::getSize()  const noexcept
+{
+    return m_nOccupiedBuffer;
+}
+
+void MemRingBuffer::forgetFromStart( sal_Int32 nBytesToForget )
+{
+    checkInvariants();
+    if( nBytesToForget > m_nOccupiedBuffer ) {
+        throw css::io::BufferSizeExceededException(
+            "MemRingBuffer::forgetFromStart BufferSizeExceededException");
+    }
+    m_nStart += nBytesToForget;
+    if( m_nStart >= m_nBufferLen ) {
+        m_nStart = m_nStart - m_nBufferLen;
+    }
+    m_nOccupiedBuffer -= nBytesToForget;
+    checkInvariants();
+}
+
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/io/source/stm/streamhelper.hxx b/io/source/stm/streamhelper.hxx
new file mode 100644
index 000000000..8cacaf1f2
--- /dev/null
+++ b/io/source/stm/streamhelper.hxx
@@ -0,0 +1,85 @@
+/* -*- 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 <com/sun/star/uno/Sequence.hxx>
+
+#include <assert.h>
+
+using namespace com::sun::star::uno;
+
+namespace io_stm
+{
+
+class MemRingBuffer
+{
+public:
+    MemRingBuffer();
+    virtual ~MemRingBuffer();
+
+    /***
+    * overwrites data at given position. Size is automatically extended, when
+    * data is written beyond end.
+    ***/
+    /// @throws css::io::BufferSizeExceededException
+    void    writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &);
+    /// @throws css::io::BufferSizeExceededException
+    void    readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const;
+    sal_Int32   getSize() const noexcept;
+    /// @throws css::io::BufferSizeExceededException
+    void    forgetFromStart(sal_Int32 nBytesToForget);
+
+private:
+    /// @throws css::io::BufferSizeExceededException
+    void resizeBuffer(sal_Int32 nMinSize);
+    void checkInvariants() const {
+        assert( m_nBufferLen >= 0 );
+        assert( m_nOccupiedBuffer >= 0 );
+        assert( m_nOccupiedBuffer <= m_nBufferLen );
+        assert( m_nStart >= 0 );
+        assert( 0 == m_nStart || m_nStart < m_nBufferLen );
+        (void) this; // avoid loplugin:staticmethods
+    }
+
+    sal_Int8    *m_p;
+    sal_Int32   m_nBufferLen;
+    sal_Int32   m_nStart;
+    sal_Int32   m_nOccupiedBuffer;
+};
+
+
+class MemFIFO :
+    private MemRingBuffer
+{
+public:
+    /// @throws css::io::BufferSizeExceededException
+    void          write( const Sequence<sal_Int8> &);
+    /// @throws css::io::BufferSizeExceededException
+    void          read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead );
+    /// @throws css::io::BufferSizeExceededException
+    void          skip( sal_Int32 nBytesToSkip );
+    sal_Int32     getSize() const noexcept
+                  { return MemRingBuffer::getSize(); }
+
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */