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

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

8 files changed, 1569 insertions, 0 deletions

diff --git a/comphelper/source/streaming/basicio.cxx b/comphelper/source/streaming/basicio.cxx
new file mode 100644
index 000000000..b8c0c96e2
--- /dev/null
+++ b/comphelper/source/streaming/basicio.cxx
@@ -0,0 +1,182 @@
+/* -*- 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 <comphelper/basicio.hxx>
+#include <comphelper/bytereader.hxx>
+#include <comphelper/servicehelper.hxx>
+#include <com/sun/star/awt/FontDescriptor.hpp>
+
+namespace comphelper
+{
+
+
+const css::uno::Reference<css::io::XObjectOutputStream>& operator << (
+        const css::uno::Reference<css::io::XObjectOutputStream>& _rxOutStream,
+        const css::awt::FontDescriptor& _rFont)
+{
+    _rxOutStream->writeUTF( _rFont.Name );
+    _rxOutStream->writeShort( _rFont.Height );
+    _rxOutStream->writeShort( _rFont.Width );
+    _rxOutStream->writeUTF( _rFont.StyleName );
+    _rxOutStream->writeShort( _rFont.Family );
+    _rxOutStream->writeShort( _rFont.CharSet );
+    _rxOutStream->writeShort( _rFont.Pitch );
+    _rxOutStream->writeDouble( _rFont.CharacterWidth );
+    _rxOutStream->writeDouble( _rFont.Weight );
+    _rxOutStream->writeShort( static_cast< sal_Int16 >(_rFont.Slant) );
+    _rxOutStream->writeShort( _rFont.Underline );
+    _rxOutStream->writeShort( _rFont.Strikeout );
+    _rxOutStream->writeDouble( _rFont.Orientation );
+    _rxOutStream->writeBoolean( _rFont.Kerning );
+    _rxOutStream->writeBoolean( _rFont.WordLineMode );
+    _rxOutStream->writeShort( _rFont.Type );
+    return _rxOutStream;
+}
+
+// FontDescriptor
+
+const css::uno::Reference<css::io::XObjectInputStream>& operator >> (
+        const css::uno::Reference<css::io::XObjectInputStream>& _rxInStream,
+        css::awt::FontDescriptor& _rFont)
+{
+    // writing the FontDescriptor
+    _rFont.Name = _rxInStream->readUTF();
+    _rFont.Height = _rxInStream->readShort();
+    _rFont.Width = _rxInStream->readShort();
+    _rFont.StyleName = _rxInStream->readUTF();
+    _rFont.Family = _rxInStream->readShort();
+    _rFont.CharSet = _rxInStream->readShort();
+    _rFont.Pitch = _rxInStream->readShort();
+    _rFont.CharacterWidth = static_cast< float >(_rxInStream->readDouble());
+    _rFont.Weight = static_cast< float >(_rxInStream->readDouble());
+    _rFont.Slant = static_cast<css::awt::FontSlant>(_rxInStream->readShort());
+    _rFont.Underline = _rxInStream->readShort();
+    _rFont.Strikeout = _rxInStream->readShort();
+    _rFont.Orientation = static_cast< float >(_rxInStream->readDouble());
+    _rFont.Kerning = _rxInStream->readBoolean() != 0;
+    _rFont.WordLineMode = _rxInStream->readBoolean() != 0;
+    _rFont.Type = _rxInStream->readShort();
+    return _rxInStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectInputStream>& operator >> (const css::uno::Reference<css::io::XObjectInputStream>& _rxInStream, bool& _rVal)
+{
+    _rVal = _rxInStream->readBoolean();
+    return _rxInStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectOutputStream>& operator << (const css::uno::Reference<css::io::XObjectOutputStream>& _rxOutStream, bool _bVal)
+{
+    _rxOutStream->writeBoolean(_bVal);
+    return _rxOutStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectInputStream>& operator >> (const css::uno::Reference<css::io::XObjectInputStream>& _rxInStream, OUString& rStr)
+{
+    rStr = _rxInStream->readUTF();
+    return _rxInStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectOutputStream>& operator << (const css::uno::Reference<css::io::XObjectOutputStream>& _rxOutStream, const OUString& rStr)
+{
+    _rxOutStream->writeUTF(rStr);
+    return _rxOutStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectInputStream>& operator >> (const css::uno::Reference<css::io::XObjectInputStream>& _rxInStream, sal_Int16& _rValue)
+{
+    _rValue = _rxInStream->readShort();
+    return _rxInStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectOutputStream>& operator << (const css::uno::Reference<css::io::XObjectOutputStream>& _rxOutStream, sal_Int16 _nValue)
+{
+    _rxOutStream->writeShort(_nValue);
+    return _rxOutStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectInputStream>& operator >> (const css::uno::Reference<css::io::XObjectInputStream>& _rxInStream, sal_uInt16& _rValue)
+{
+    _rValue = _rxInStream->readShort();
+    return _rxInStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectOutputStream>& operator << (const css::uno::Reference<css::io::XObjectOutputStream>& _rxOutStream, sal_uInt16 _nValue)
+{
+    _rxOutStream->writeShort(_nValue);
+    return _rxOutStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectInputStream>& operator >> (const css::uno::Reference<css::io::XObjectInputStream>& _rxInStream, sal_uInt32& _rValue)
+{
+    _rValue = _rxInStream->readLong();
+    return _rxInStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectOutputStream>& operator << (const css::uno::Reference<css::io::XObjectOutputStream>& _rxOutStream, sal_uInt32 _nValue)
+{
+    _rxOutStream->writeLong(_nValue);
+    return _rxOutStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectInputStream>& operator >> (const css::uno::Reference<css::io::XObjectInputStream>& _rxInStream, sal_Int32& _rValue)
+{
+    _rValue = _rxInStream->readLong();
+    return _rxInStream;
+}
+
+
+const css::uno::Reference<css::io::XObjectOutputStream>& operator << (const css::uno::Reference<css::io::XObjectOutputStream>& _rxOutStream, sal_Int32 _nValue)
+{
+    _rxOutStream->writeLong(_nValue);
+    return _rxOutStream;
+}
+
+ByteReader::~ByteReader() {}
+
+const css::uno::Sequence< sal_Int8 > & ByteReader::getUnoTunnelId()
+{
+    static const comphelper::UnoIdInit implId;
+    return implId.getSeq();
+}
+
+ByteWriter::~ByteWriter() {}
+
+const css::uno::Sequence< sal_Int8 > & ByteWriter::getUnoTunnelId()
+{
+    static const comphelper::UnoIdInit implId;
+    return implId.getSeq();
+}
+
+
+}   // namespace comphelper
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/streaming/memorystream.cxx b/comphelper/source/streaming/memorystream.cxx
new file mode 100644
index 000000000..8bf3c3e90
--- /dev/null
+++ b/comphelper/source/streaming/memorystream.cxx
@@ -0,0 +1,286 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <algorithm>
+#include <memory>
+
+#include <boost/core/noinit_adaptor.hpp>
+
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+#include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/io/XStream.hpp>
+#include <com/sun/star/io/XSeekableInputStream.hpp>
+#include <com/sun/star/io/XTruncate.hpp>
+//#include <com/sun/star/uno/XComponentContext.hpp>
+#include <comphelper/bytereader.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <o3tl/safeint.hxx>
+#include <osl/diagnose.h>
+
+#include <string.h>
+#include <vector>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using ::cppu::OWeakObject;
+using ::cppu::WeakImplHelper;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::osl;
+
+namespace comphelper
+{
+
+namespace {
+
+class UNOMemoryStream :
+    public WeakImplHelper<XServiceInfo, XStream, XSeekableInputStream, XOutputStream, XTruncate, XUnoTunnel>,
+    public comphelper::ByteWriter
+{
+public:
+    UNOMemoryStream();
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+    virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+
+    // XStream
+    virtual Reference< XInputStream > SAL_CALL getInputStream(  ) override;
+    virtual Reference< XOutputStream > SAL_CALL getOutputStream(  ) override;
+
+    // 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;
+
+    // XSeekable
+    virtual void SAL_CALL seek( sal_Int64 location ) override;
+    virtual sal_Int64 SAL_CALL getPosition() override;
+    virtual sal_Int64 SAL_CALL getLength() override;
+
+    // XOutputStream
+    virtual void SAL_CALL writeBytes( const Sequence< sal_Int8 >& aData ) override;
+    virtual void SAL_CALL flush() override;
+    virtual void SAL_CALL closeOutput() override;
+
+    // XTruncate
+    virtual void SAL_CALL truncate() override;
+
+    // XUnoTunnel
+    virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override;
+
+    // comphelper::ByteWriter
+    virtual sal_Int32 writeSomeBytes(const sal_Int8* aData, sal_Int32 nBytesToWrite) override;
+
+private:
+    std::vector< sal_Int8, boost::noinit_adaptor<std::allocator<sal_Int8>> > maData;
+    sal_Int32 mnCursor;
+};
+
+}
+
+UNOMemoryStream::UNOMemoryStream()
+: mnCursor(0)
+{
+    maData.reserve(1 * 1024 * 1024);
+}
+
+// XServiceInfo
+OUString SAL_CALL UNOMemoryStream::getImplementationName()
+{
+    return "com.sun.star.comp.MemoryStream";
+}
+
+sal_Bool SAL_CALL UNOMemoryStream::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence<OUString> SAL_CALL UNOMemoryStream::getSupportedServiceNames()
+{
+    return { "com.sun.star.comp.MemoryStream" };
+}
+
+// XStream
+Reference< XInputStream > SAL_CALL UNOMemoryStream::getInputStream(  )
+{
+    return this;
+}
+
+Reference< XOutputStream > SAL_CALL UNOMemoryStream::getOutputStream(  )
+{
+    return this;
+}
+
+// XInputStream
+sal_Int32 SAL_CALL UNOMemoryStream::readBytes( Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
+{
+    if( nBytesToRead < 0 )
+        throw IOException("nBytesToRead < 0");
+
+    nBytesToRead = std::min( nBytesToRead, available() );
+    aData.realloc( nBytesToRead );
+
+    if( nBytesToRead )
+    {
+        sal_Int8* pData = &(*maData.begin());
+        sal_Int8* pCursor = &(pData[mnCursor]);
+        memcpy( aData.getArray(), pCursor, nBytesToRead );
+
+        mnCursor += nBytesToRead;
+    }
+
+    return nBytesToRead;
+}
+
+sal_Int32 SAL_CALL UNOMemoryStream::readSomeBytes( Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
+{
+    return readBytes( aData, nMaxBytesToRead );
+}
+
+void SAL_CALL UNOMemoryStream::skipBytes( sal_Int32 nBytesToSkip )
+{
+    if( nBytesToSkip < 0 )
+        throw IOException("nBytesToSkip < 0");
+
+    mnCursor += std::min( nBytesToSkip, available() );
+}
+
+sal_Int32 SAL_CALL UNOMemoryStream::available()
+{
+    return std::min<sal_Int64>( SAL_MAX_INT32, maData.size() - mnCursor);
+}
+
+void SAL_CALL UNOMemoryStream::closeInput()
+{
+    mnCursor = 0;
+}
+
+// XSeekable
+void SAL_CALL UNOMemoryStream::seek( sal_Int64 location )
+{
+    if( (location < 0) || (location > SAL_MAX_INT32) )
+        throw IllegalArgumentException("this implementation does not support more than 2GB!", static_cast<OWeakObject*>(this), 0 );
+
+    // seek operation should be able to resize the stream
+    if ( o3tl::make_unsigned(location) > maData.size() )
+        maData.resize( static_cast< sal_Int32 >( location ) );
+
+    mnCursor = static_cast< sal_Int32 >( location );
+}
+
+sal_Int64 SAL_CALL UNOMemoryStream::getPosition()
+{
+    return static_cast< sal_Int64 >( mnCursor );
+}
+
+sal_Int64 SAL_CALL UNOMemoryStream::getLength()
+{
+    return static_cast< sal_Int64 >( maData.size() );
+}
+
+// XOutputStream
+void SAL_CALL UNOMemoryStream::writeBytes( const Sequence< sal_Int8 >& aData )
+{
+    const sal_Int32 nBytesToWrite( aData.getLength() );
+    if( !nBytesToWrite )
+        return;
+
+    sal_Int64 nNewSize = static_cast<sal_Int64>(mnCursor) + nBytesToWrite;
+    if( nNewSize > SAL_MAX_INT32 )
+    {
+        OSL_ASSERT(false);
+        throw IOException("this implementation does not support more than 2GB!", static_cast<OWeakObject*>(this) );
+    }
+
+    if( static_cast< sal_Int32 >( nNewSize ) > static_cast< sal_Int32 >( maData.size() ) )
+        maData.resize( nNewSize );
+
+    sal_Int8* pData = &(*maData.begin());
+    sal_Int8* pCursor = &(pData[mnCursor]);
+    memcpy(pCursor, aData.getConstArray(), nBytesToWrite);
+
+    mnCursor += nBytesToWrite;
+}
+
+sal_Int32 UNOMemoryStream::writeSomeBytes( const sal_Int8* pInData, sal_Int32 nBytesToWrite )
+{
+    if( !nBytesToWrite )
+        return 0;
+
+    sal_Int64 nNewSize = static_cast<sal_Int64>(mnCursor) + nBytesToWrite;
+    if( nNewSize > SAL_MAX_INT32 )
+    {
+        OSL_ASSERT(false);
+        throw IOException("this implementation does not support more than 2GB!", static_cast<OWeakObject*>(this) );
+    }
+
+    if( static_cast< sal_Int32 >( nNewSize ) > static_cast< sal_Int32 >( maData.size() ) )
+        maData.resize( nNewSize );
+
+    sal_Int8* pData = &(*maData.begin());
+    sal_Int8* pCursor = &(pData[mnCursor]);
+    // cast to avoid -Werror=class-memaccess
+    memcpy(pCursor, pInData, nBytesToWrite);
+
+    mnCursor += nBytesToWrite;
+    return nBytesToWrite;
+}
+
+void SAL_CALL UNOMemoryStream::flush()
+{
+}
+
+void SAL_CALL UNOMemoryStream::closeOutput()
+{
+    mnCursor = 0;
+}
+
+//XTruncate
+void SAL_CALL UNOMemoryStream::truncate()
+{
+    maData.clear();
+    mnCursor = 0;
+}
+
+sal_Int64 SAL_CALL UNOMemoryStream::getSomething( const css::uno::Sequence< sal_Int8 >& rIdentifier )
+{
+    if (rIdentifier == comphelper::ByteWriter::getUnoTunnelId())
+        return reinterpret_cast<sal_Int64>(static_cast<comphelper::ByteWriter*>(this));
+    return 0;
+}
+
+} // namespace comphelper
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+com_sun_star_comp_MemoryStream(
+    css::uno::XComponentContext *,
+    css::uno::Sequence<css::uno::Any> const &)
+{
+    return cppu::acquire(new ::comphelper::UNOMemoryStream());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/streaming/oslfile2streamwrap.cxx b/comphelper/source/streaming/oslfile2streamwrap.cxx
new file mode 100644
index 000000000..243634610
--- /dev/null
+++ b/comphelper/source/streaming/oslfile2streamwrap.cxx
@@ -0,0 +1,171 @@
+/* -*- 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 <comphelper/oslfile2streamwrap.hxx>
+#include <o3tl/safeint.hxx>
+#include <osl/file.hxx>
+
+#include <algorithm>
+
+namespace comphelper
+{
+    using namespace osl;
+
+
+OSLInputStreamWrapper::OSLInputStreamWrapper( File& _rFile )
+    : m_pFile(&_rFile)
+{
+}
+
+
+OSLInputStreamWrapper::~OSLInputStreamWrapper()
+{
+}
+
+
+sal_Int32 SAL_CALL OSLInputStreamWrapper::readBytes(css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead)
+{
+    if (!m_pFile)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+
+    if (nBytesToRead < 0)
+        throw css::io::BufferSizeExceededException(OUString(),static_cast<css::uno::XWeak*>(this));
+
+    aData.realloc(nBytesToRead);
+
+    std::scoped_lock aGuard( m_aMutex );
+
+    sal_uInt64 nRead = 0;
+    FileBase::RC eError = m_pFile->read(static_cast<void*>(aData.getArray()), nBytesToRead, nRead);
+    if (eError != FileBase::E_None)
+        throw css::io::BufferSizeExceededException(OUString(),static_cast<css::uno::XWeak*>(this));
+
+    // If the read character < MaxLength, adjust css::uno::Sequence
+    if (nRead < o3tl::make_unsigned(nBytesToRead))
+        aData.realloc( sal::static_int_cast< sal_Int32 >(nRead) );
+
+    return sal::static_int_cast< sal_Int32 >(nRead);
+}
+
+sal_Int32 SAL_CALL OSLInputStreamWrapper::readSomeBytes(css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead)
+{
+    if (!m_pFile)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+
+    if (nMaxBytesToRead < 0)
+        throw css::io::BufferSizeExceededException(OUString(),static_cast<css::uno::XWeak*>(this));
+
+    return readBytes(aData, nMaxBytesToRead);
+}
+
+void SAL_CALL OSLInputStreamWrapper::skipBytes(sal_Int32 nBytesToSkip)
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if (!m_pFile)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+
+    sal_uInt64 nCurrentPos;
+    FileBase::RC eError = m_pFile->getPos(nCurrentPos);
+    if (eError != FileBase::E_None)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+
+    sal_uInt64 nNewPos = nCurrentPos + nBytesToSkip;
+    eError = m_pFile->setPos(osl_Pos_Absolut, nNewPos);
+    if (eError != FileBase::E_None)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+}
+
+sal_Int32 SAL_CALL OSLInputStreamWrapper::available()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if (!m_pFile)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+
+    sal_uInt64 nPos;
+    FileBase::RC eError = m_pFile->getPos(nPos);
+    if (eError != FileBase::E_None)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+
+    eError = m_pFile->setPos(osl_Pos_End, 0);
+    if (eError != FileBase::E_None)
+       throw css::io::NotConnectedException(OUString(),static_cast<css::uno::XWeak*>(this));
+
+    sal_uInt64 nAvailable;
+    eError = m_pFile->getPos(nAvailable);
+    if (eError != FileBase::E_None)
+       throw css::io::NotConnectedException(OUString(),static_cast<css::uno::XWeak*>(this));
+
+    nAvailable = nAvailable - nPos;
+    eError = m_pFile->setPos(osl_Pos_Absolut, nPos);
+    if (eError != FileBase::E_None)
+       throw css::io::NotConnectedException(OUString(),static_cast<css::uno::XWeak*>(this));
+    return std::min<sal_Int64>(nAvailable, SAL_MAX_INT32);
+}
+
+
+void SAL_CALL OSLInputStreamWrapper::closeInput()
+{
+    if (!m_pFile)
+        throw css::io::NotConnectedException(OUString(), static_cast<css::uno::XWeak*>(this));
+
+    m_pFile->close();
+
+    m_pFile = nullptr;
+}
+
+/*************************************************************************/
+// css::io::XOutputStream
+
+
+OSLOutputStreamWrapper::OSLOutputStreamWrapper(osl::File & _rFile):
+    rFile(_rFile)
+{}
+
+OSLOutputStreamWrapper::~OSLOutputStreamWrapper() {}
+
+void SAL_CALL OSLOutputStreamWrapper::writeBytes(const css::uno::Sequence< sal_Int8 >& aData)
+{
+    sal_uInt64 nWritten;
+    FileBase::RC eError = rFile.write(aData.getConstArray(),aData.getLength(), nWritten);
+    if (eError != FileBase::E_None
+        || nWritten != sal::static_int_cast< sal_uInt32 >(aData.getLength()))
+    {
+        throw css::io::BufferSizeExceededException(OUString(),static_cast<css::uno::XWeak*>(this));
+    }
+}
+
+
+void SAL_CALL OSLOutputStreamWrapper::flush()
+{
+}
+
+
+void SAL_CALL OSLOutputStreamWrapper::closeOutput()
+{
+    rFile.close();
+}
+
+} // namespace comphelper
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/streaming/seekableinput.cxx b/comphelper/source/streaming/seekableinput.cxx
new file mode 100644
index 000000000..3508f933e
--- /dev/null
+++ b/comphelper/source/streaming/seekableinput.cxx
@@ -0,0 +1,233 @@
+/* -*- 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 <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/TempFile.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+
+
+#include <comphelper/seekableinput.hxx>
+#include <utility>
+
+using namespace ::com::sun::star;
+
+namespace comphelper
+{
+
+const sal_Int32 nConstBufferSize = 32000;
+
+
+static void copyInputToOutput_Impl( const uno::Reference< io::XInputStream >& xIn,
+                            const uno::Reference< io::XOutputStream >& xOut )
+{
+    sal_Int32 nRead;
+    uno::Sequence< sal_Int8 > aSequence( nConstBufferSize );
+
+    do
+    {
+        nRead = xIn->readBytes( aSequence, nConstBufferSize );
+        if ( nRead < nConstBufferSize )
+        {
+            uno::Sequence< sal_Int8 > aTempBuf( aSequence.getConstArray(), nRead );
+            xOut->writeBytes( aTempBuf );
+        }
+        else
+            xOut->writeBytes( aSequence );
+    }
+    while ( nRead == nConstBufferSize );
+}
+
+
+OSeekableInputWrapper::OSeekableInputWrapper(
+            uno::Reference< io::XInputStream > xInStream,
+            uno::Reference< uno::XComponentContext > xContext )
+: m_xContext(std::move( xContext ))
+, m_xOriginalStream(std::move( xInStream ))
+{
+    if ( !m_xContext.is() )
+        throw uno::RuntimeException();
+}
+
+
+OSeekableInputWrapper::~OSeekableInputWrapper()
+{
+}
+
+
+uno::Reference< io::XInputStream > OSeekableInputWrapper::CheckSeekableCanWrap(
+                            const uno::Reference< io::XInputStream >& xInStream,
+                            const uno::Reference< uno::XComponentContext >& rxContext )
+{
+    // check that the stream is seekable and just wrap it if it is not
+    uno::Reference< io::XSeekable > xSeek( xInStream, uno::UNO_QUERY );
+    if ( xSeek.is() )
+        return xInStream;
+
+    return new OSeekableInputWrapper(xInStream, rxContext);
+}
+
+
+void OSeekableInputWrapper::PrepareCopy_Impl()
+{
+    if ( !m_xCopyInput.is() )
+    {
+        if ( !m_xContext.is() )
+            throw uno::RuntimeException();
+
+        uno::Reference< io::XOutputStream > xTempOut(
+                io::TempFile::create(m_xContext),
+                uno::UNO_QUERY_THROW );
+
+        copyInputToOutput_Impl( m_xOriginalStream, xTempOut );
+        xTempOut->closeOutput();
+
+        uno::Reference< io::XSeekable > xTempSeek( xTempOut, uno::UNO_QUERY );
+        if ( xTempSeek.is() )
+        {
+            xTempSeek->seek( 0 );
+            m_xCopyInput.set( xTempOut, uno::UNO_QUERY );
+            if ( m_xCopyInput.is() )
+                m_xCopySeek = xTempSeek;
+        }
+    }
+
+    if ( !m_xCopyInput.is() )
+        throw io::IOException("no m_xCopyInput");
+}
+
+// XInputStream
+
+sal_Int32 SAL_CALL OSeekableInputWrapper::readBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    PrepareCopy_Impl();
+
+    return m_xCopyInput->readBytes( aData, nBytesToRead );
+}
+
+
+sal_Int32 SAL_CALL OSeekableInputWrapper::readSomeBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    PrepareCopy_Impl();
+
+    return m_xCopyInput->readSomeBytes( aData, nMaxBytesToRead );
+}
+
+
+void SAL_CALL OSeekableInputWrapper::skipBytes( sal_Int32 nBytesToSkip )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    PrepareCopy_Impl();
+
+    m_xCopyInput->skipBytes( nBytesToSkip );
+}
+
+
+sal_Int32 SAL_CALL OSeekableInputWrapper::available()
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    PrepareCopy_Impl();
+
+    return m_xCopyInput->available();
+}
+
+
+void SAL_CALL OSeekableInputWrapper::closeInput()
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    m_xOriginalStream->closeInput();
+    m_xOriginalStream.clear();
+
+    if ( m_xCopyInput.is() )
+    {
+        m_xCopyInput->closeInput();
+        m_xCopyInput.clear();
+    }
+
+    m_xCopySeek.clear();
+}
+
+
+// XSeekable
+
+void SAL_CALL OSeekableInputWrapper::seek( sal_Int64 location )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    PrepareCopy_Impl();
+
+    m_xCopySeek->seek( location );
+}
+
+
+sal_Int64 SAL_CALL OSeekableInputWrapper::getPosition()
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    PrepareCopy_Impl();
+
+    return m_xCopySeek->getPosition();
+}
+
+
+sal_Int64 SAL_CALL OSeekableInputWrapper::getLength()
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_xOriginalStream.is() )
+        throw io::NotConnectedException();
+
+    PrepareCopy_Impl();
+
+    return m_xCopySeek->getLength();
+}
+
+}   // namespace comphelper
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/streaming/seqinputstreamserv.cxx b/comphelper/source/streaming/seqinputstreamserv.cxx
new file mode 100644
index 000000000..5d10029a5
--- /dev/null
+++ b/comphelper/source/streaming/seqinputstreamserv.cxx
@@ -0,0 +1,215 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <comphelper/seqstream.hxx>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XSeekableInputStream.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/frame/DoubleInitializationException.hpp>
+#include <mutex>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace ::com::sun::star;
+
+namespace {
+
+class SequenceInputStreamService:
+    public ::cppu::WeakImplHelper<
+        lang::XServiceInfo,
+        io::XSeekableInputStream,
+        lang::XInitialization>
+{
+public:
+    explicit SequenceInputStreamService();
+
+    // noncopyable
+    SequenceInputStreamService(const SequenceInputStreamService&) = delete;
+    const SequenceInputStreamService& operator=(const SequenceInputStreamService&) = delete;
+
+    // css::lang::XServiceInfo:
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString & ServiceName ) override;
+    virtual uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // css::io::XInputStream:
+    virtual ::sal_Int32 SAL_CALL readBytes( uno::Sequence< ::sal_Int8 > & aData, ::sal_Int32 nBytesToRead ) override;
+    virtual ::sal_Int32 SAL_CALL readSomeBytes( uno::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;
+
+    // css::io::XSeekable:
+    virtual void SAL_CALL seek( ::sal_Int64 location ) override;
+    virtual ::sal_Int64 SAL_CALL getPosition() override;
+    virtual ::sal_Int64 SAL_CALL getLength() override;
+
+    // css::lang::XInitialization:
+    virtual void SAL_CALL initialize( const uno::Sequence< css::uno::Any > & aArguments ) override;
+
+private:
+    virtual ~SequenceInputStreamService() override {}
+
+
+    std::mutex m_aMutex;
+    bool m_bInitialized;
+    uno::Reference< io::XInputStream > m_xInputStream;
+    uno::Reference< io::XSeekable > m_xSeekable;
+};
+
+SequenceInputStreamService::SequenceInputStreamService()
+: m_bInitialized( false )
+{}
+
+// com.sun.star.uno.XServiceInfo:
+OUString SAL_CALL SequenceInputStreamService::getImplementationName()
+{
+    return "com.sun.star.comp.SequenceInputStreamService";
+}
+
+sal_Bool SAL_CALL SequenceInputStreamService::supportsService( OUString const & serviceName )
+{
+    return cppu::supportsService(this, serviceName);
+}
+
+uno::Sequence< OUString > SAL_CALL SequenceInputStreamService::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.SequenceInputStream" };
+}
+
+// css::io::XInputStream:
+::sal_Int32 SAL_CALL SequenceInputStreamService::readBytes( uno::Sequence< ::sal_Int8 > & aData, ::sal_Int32 nBytesToRead )
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xInputStream.is() )
+        throw io::NotConnectedException();
+
+    return m_xInputStream->readBytes( aData, nBytesToRead );
+}
+
+::sal_Int32 SAL_CALL SequenceInputStreamService::readSomeBytes( uno::Sequence< ::sal_Int8 > & aData, ::sal_Int32 nMaxBytesToRead )
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xInputStream.is() )
+        throw io::NotConnectedException();
+
+    return m_xInputStream->readSomeBytes( aData, nMaxBytesToRead );
+}
+
+void SAL_CALL SequenceInputStreamService::skipBytes( ::sal_Int32 nBytesToSkip )
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xInputStream.is() )
+        throw io::NotConnectedException();
+
+    return m_xInputStream->skipBytes( nBytesToSkip );
+}
+
+::sal_Int32 SAL_CALL SequenceInputStreamService::available()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xInputStream.is() )
+        throw io::NotConnectedException();
+
+    return m_xInputStream->available();
+}
+
+void SAL_CALL SequenceInputStreamService::closeInput()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xInputStream.is() )
+        throw io::NotConnectedException();
+
+    m_xInputStream->closeInput();
+    m_xInputStream.clear();
+    m_xSeekable.clear();
+}
+
+// css::io::XSeekable:
+void SAL_CALL SequenceInputStreamService::seek( ::sal_Int64 location )
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xSeekable.is() )
+        throw io::NotConnectedException();
+
+    m_xSeekable->seek( location );
+}
+
+::sal_Int64 SAL_CALL SequenceInputStreamService::getPosition()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xSeekable.is() )
+        throw io::NotConnectedException();
+
+    return m_xSeekable->getPosition();
+}
+
+::sal_Int64 SAL_CALL SequenceInputStreamService::getLength()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xSeekable.is() )
+        throw io::NotConnectedException();
+
+    return m_xSeekable->getLength();
+}
+
+// css::lang::XInitialization:
+void SAL_CALL SequenceInputStreamService::initialize( const uno::Sequence< css::uno::Any > & aArguments )
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( m_bInitialized )
+        throw frame::DoubleInitializationException();
+
+    if ( aArguments.getLength() != 1 )
+        throw lang::IllegalArgumentException( "Wrong number of arguments!",
+                                            static_cast< ::cppu::OWeakObject* >(this),
+                                            1 );
+
+    uno::Sequence< sal_Int8 > aSeq;
+    if ( !(aArguments[0] >>= aSeq) )
+        throw lang::IllegalArgumentException( "Unexpected type of argument!",
+                                            static_cast< ::cppu::OWeakObject* >(this),
+                                            1 );
+
+    uno::Reference< io::XInputStream > xInputStream(
+                    static_cast< ::cppu::OWeakObject* >( new ::comphelper::SequenceInputStream( aSeq ) ),
+                    uno::UNO_QUERY_THROW );
+    uno::Reference< io::XSeekable > xSeekable( xInputStream, uno::UNO_QUERY_THROW );
+    m_xInputStream = xInputStream;
+    m_xSeekable = xSeekable;
+    m_bInitialized = true;
+}
+
+} // anonymous namespace
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+com_sun_star_comp_SequenceInputStreamService(
+                                             css::uno::XComponentContext *,
+                                             css::uno::Sequence<css::uno::Any> const &)
+{
+    return cppu::acquire(new SequenceInputStreamService());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/streaming/seqoutputstreamserv.cxx b/comphelper/source/streaming/seqoutputstreamserv.cxx
new file mode 100644
index 000000000..19ef79002
--- /dev/null
+++ b/comphelper/source/streaming/seqoutputstreamserv.cxx
@@ -0,0 +1,144 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <comphelper/seqstream.hxx>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/XSequenceOutputStream.hpp>
+#include <mutex>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+using namespace ::com::sun::star;
+
+
+namespace {
+
+class SequenceOutputStreamService:
+    public cppu::WeakImplHelper<lang::XServiceInfo, io::XSequenceOutputStream>
+{
+public:
+    explicit SequenceOutputStreamService();
+
+    // noncopyable
+    SequenceOutputStreamService(const SequenceOutputStreamService&) = delete;
+    const SequenceOutputStreamService& operator=(const SequenceOutputStreamService&) = delete;
+
+    // css::lang::XServiceInfo:
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString & ServiceName ) override;
+    virtual uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // css::io::XOutputStream:
+    virtual void SAL_CALL writeBytes( const uno::Sequence< ::sal_Int8 > & aData ) override;
+    virtual void SAL_CALL flush() override;
+    virtual void SAL_CALL closeOutput() override;
+
+    // css::io::XSequenceOutputStream:
+    virtual uno::Sequence< ::sal_Int8 > SAL_CALL getWrittenBytes(  ) override;
+
+private:
+    virtual ~SequenceOutputStreamService() override {};
+
+
+    std::mutex m_aMutex;
+    // WARNING: dtor of m_xOutputStream writes into m_aSequence so that must live longer!
+    uno::Sequence< ::sal_Int8 > m_aSequence;
+    uno::Reference< io::XOutputStream > m_xOutputStream;
+};
+SequenceOutputStreamService::SequenceOutputStreamService()
+{
+    m_xOutputStream.set( static_cast < ::cppu::OWeakObject* >( new ::comphelper::OSequenceOutputStream( m_aSequence ) ), uno::UNO_QUERY_THROW );
+}
+
+// com.sun.star.uno.XServiceInfo:
+OUString SAL_CALL SequenceOutputStreamService::getImplementationName()
+{
+    return "com.sun.star.comp.SequenceOutputStreamService";
+}
+
+sal_Bool SAL_CALL SequenceOutputStreamService::supportsService( OUString const & serviceName )
+{
+    return cppu::supportsService(this, serviceName);
+}
+
+uno::Sequence< OUString > SAL_CALL SequenceOutputStreamService::getSupportedServiceNames()
+{
+    return { "com.sun.star.io.SequenceOutputStream" };
+}
+
+// css::io::XOutputStream:
+void SAL_CALL SequenceOutputStreamService::writeBytes( const uno::Sequence< ::sal_Int8 > & aData )
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xOutputStream.is() )
+        throw io::NotConnectedException();
+
+    m_xOutputStream->writeBytes( aData );
+}
+
+void SAL_CALL SequenceOutputStreamService::flush()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xOutputStream.is() )
+        throw io::NotConnectedException();
+
+    m_xOutputStream->flush();
+};
+
+void SAL_CALL SequenceOutputStreamService::closeOutput()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    if ( !m_xOutputStream.is() )
+        throw io::NotConnectedException();
+
+    m_xOutputStream->flush();
+    m_xOutputStream->closeOutput();
+    m_xOutputStream.clear();
+}
+
+// css::io::XSequenceOutputStream:
+uno::Sequence< ::sal_Int8 > SAL_CALL SequenceOutputStreamService::getWrittenBytes()
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if (m_xOutputStream.is())
+    {
+        m_xOutputStream->flush();
+    }
+    // else: no exception, just return the finished sequence
+
+    return m_aSequence;
+}
+
+} // anonymous namespace
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+com_sun_star_comp_SequenceOutputStreamService(
+    css::uno::XComponentContext *,
+    css::uno::Sequence<css::uno::Any> const &)
+{
+    return cppu::acquire(new SequenceOutputStreamService());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/streaming/seqstream.cxx b/comphelper/source/streaming/seqstream.cxx
new file mode 100644
index 000000000..1f37a7967
--- /dev/null
+++ b/comphelper/source/streaming/seqstream.cxx
@@ -0,0 +1,247 @@
+/* -*- 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/lang/IllegalArgumentException.hpp>
+#include <comphelper/seqstream.hxx>
+
+#include <osl/diagnose.h>
+
+namespace comphelper
+{
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::io;
+using namespace ::com::sun::star::uno;
+using namespace ::osl;
+
+
+
+
+SequenceInputStream::SequenceInputStream(
+    css::uno::Sequence<sal_Int8> const & rData)
+:   m_aData(rData)
+,   m_nPos(0)
+{
+}
+
+// checks if closed, returns available size, not mutex-protected
+
+inline sal_Int32 SequenceInputStream::avail()
+{
+    if (m_nPos == -1)
+        throw NotConnectedException(OUString(), *this);
+
+    return m_aData.getLength() - m_nPos;
+}
+
+// css::io::XInputStream
+
+sal_Int32 SAL_CALL SequenceInputStream::readBytes( Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead )
+{
+    if (nBytesToRead < 0)
+        throw BufferSizeExceededException(OUString(),*this);
+
+    std::scoped_lock aGuard( m_aMutex );
+
+    sal_Int32 nAvail = avail();
+
+    if (nAvail < nBytesToRead)
+        nBytesToRead = nAvail;
+
+    aData.realloc(nBytesToRead);
+    memcpy(aData.getArray(), m_aData.getConstArray() + m_nPos, nBytesToRead);
+    m_nPos += nBytesToRead;
+
+    return nBytesToRead;
+}
+
+sal_Int32 SequenceInputStream::readSomeBytes( sal_Int8* pData, sal_Int32 nBytesToRead )
+{
+    if (nBytesToRead < 0)
+        throw BufferSizeExceededException(OUString(),*this);
+
+    std::scoped_lock aGuard( m_aMutex );
+
+    sal_Int32 nAvail = avail();
+
+    if (nAvail < nBytesToRead)
+        nBytesToRead = nAvail;
+
+    memcpy(pData, m_aData.getConstArray() + m_nPos, nBytesToRead);
+    m_nPos += nBytesToRead;
+
+    return nBytesToRead;
+}
+
+sal_Int64 SAL_CALL SequenceInputStream::getSomething( const css::uno::Sequence< sal_Int8 >& rIdentifier )
+{
+    if (rIdentifier == comphelper::ByteReader::getUnoTunnelId())
+        return reinterpret_cast<sal_Int64>(static_cast<comphelper::ByteReader*>(this));
+    return 0;
+}
+
+sal_Int32 SAL_CALL SequenceInputStream::readSomeBytes( Sequence<sal_Int8>& aData, sal_Int32 nMaxBytesToRead )
+{
+    // all data is available at once
+    return readBytes(aData, nMaxBytesToRead);
+}
+
+
+void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip )
+{
+    if (nBytesToSkip < 0)
+        throw BufferSizeExceededException(OUString(),*this);
+
+    std::scoped_lock aGuard( m_aMutex );
+
+    sal_Int32 nAvail = avail();
+
+    if (nAvail < nBytesToSkip)
+        nBytesToSkip = nAvail;
+
+    m_nPos += nBytesToSkip;
+}
+
+
+sal_Int32 SAL_CALL SequenceInputStream::available(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    return avail();
+}
+
+
+void SAL_CALL SequenceInputStream::closeInput(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if (m_nPos == -1)
+        throw NotConnectedException(OUString(), *this);
+
+    m_nPos = -1;
+}
+
+void SAL_CALL SequenceInputStream::seek( sal_Int64 location )
+{
+    if ( location > m_aData.getLength() || location < 0 || location > SAL_MAX_INT32 )
+        throw IllegalArgumentException("bad location", static_cast<cppu::OWeakObject*>(this), 1);
+    std::scoped_lock aGuard( m_aMutex );
+    m_nPos = static_cast<sal_Int32>(location);
+}
+
+sal_Int64 SAL_CALL SequenceInputStream::getPosition()
+{
+    std::scoped_lock aGuard( m_aMutex );
+    return m_nPos;
+}
+
+sal_Int64 SAL_CALL SequenceInputStream::getLength(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+    return m_aData.getLength();
+}
+
+
+OSequenceOutputStream::OSequenceOutputStream(Sequence< sal_Int8 >& _rSeq, double _nResizeFactor, sal_Int32 _nMinimumResize)
+    :m_rSequence(_rSeq)
+    ,m_nResizeFactor(_nResizeFactor)
+    ,m_nMinimumResize(_nMinimumResize)
+    ,m_nSize(0) // starting at position 0
+    ,m_bConnected(true)
+{
+    OSL_ENSURE(m_nResizeFactor > 1, "OSequenceOutputStream::OSequenceOutputStream : invalid resize factor !");
+
+    if (m_nResizeFactor <= 1)
+        m_nResizeFactor = 1.3;
+}
+
+
+void SAL_CALL OSequenceOutputStream::writeBytes( const Sequence< sal_Int8 >& _rData )
+{
+    std::scoped_lock aGuard(m_aMutex);
+    if (!m_bConnected)
+        throw NotConnectedException();
+
+    // ensure the sequence has enough space left
+    if (m_nSize + _rData.getLength() > m_rSequence.getLength())
+    {
+        sal_Int32 nCurrentLength = m_rSequence.getLength();
+        sal_Int32 nNewLength = static_cast< sal_Int32 >(
+            nCurrentLength * m_nResizeFactor);
+
+        if (m_nMinimumResize > nNewLength - nCurrentLength)
+            // we have a minimum so it's not too inefficient for small sequences and small write requests
+            nNewLength = nCurrentLength + m_nMinimumResize;
+
+        if (nNewLength < m_nSize + _rData.getLength())
+        {   // it's not enough... the data would not fit
+
+            // let's take the double amount of the length of the data to be written, as the next write
+            // request could be as large as this one
+            sal_Int32 nNewGrowth = _rData.getLength() * 2;
+            nNewLength = nCurrentLength + nNewGrowth;
+        }
+
+        // round it off to the next multiple of 4...
+        nNewLength = (nNewLength + 3) / 4 * 4;
+
+        m_rSequence.realloc(nNewLength);
+    }
+
+    OSL_ENSURE(m_rSequence.getLength() >= m_nSize + _rData.getLength(),
+        "ooops ... the realloc algorithm seems to be wrong :( !");
+
+    memcpy(m_rSequence.getArray() + m_nSize, _rData.getConstArray(), _rData.getLength());
+    m_nSize += _rData.getLength();
+}
+
+
+void SAL_CALL OSequenceOutputStream::flush(  )
+{
+    std::scoped_lock aGuard(m_aMutex);
+    if (!m_bConnected)
+        throw NotConnectedException();
+
+    // cut the sequence to the real size
+    m_rSequence.realloc(m_nSize);
+}
+
+void OSequenceOutputStream::finalizeOutput()
+{
+    // cut the sequence to the real size
+    m_rSequence.realloc(m_nSize);
+    // and don't allow any further accesses
+    m_bConnected = false;
+}
+
+void SAL_CALL OSequenceOutputStream::closeOutput()
+{
+    std::scoped_lock aGuard(m_aMutex);
+    if (!m_bConnected)
+        throw NotConnectedException();
+
+    finalizeOutput();
+}
+
+} // namespace comphelper
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/comphelper/source/streaming/streamsection.cxx b/comphelper/source/streaming/streamsection.cxx
new file mode 100644
index 000000000..b03df8ab7
--- /dev/null
+++ b/comphelper/source/streaming/streamsection.cxx
@@ -0,0 +1,91 @@
+/* -*- 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 <comphelper/streamsection.hxx>
+#include <com/sun/star/io/XMarkableStream.hpp>
+#include <com/sun/star/io/XDataInputStream.hpp>
+#include <com/sun/star/io/XDataOutputStream.hpp>
+#include <osl/diagnose.h>
+
+namespace comphelper
+{
+
+
+OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataInputStream >& _rxInput)
+    :m_xMarkStream(_rxInput, css::uno::UNO_QUERY)
+    ,m_xInStream(_rxInput)
+    ,m_nBlockStart(-1)
+    ,m_nBlockLen(-1)
+{
+    OSL_ENSURE(m_xInStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
+    if (m_xInStream.is() && m_xMarkStream.is())
+    {
+        m_nBlockLen = _rxInput->readLong();
+        m_nBlockStart = m_xMarkStream->createMark();
+    }
+}
+
+
+OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataOutputStream >& _rxOutput)
+    :m_xMarkStream(_rxOutput, css::uno::UNO_QUERY)
+    ,m_xOutStream(_rxOutput)
+    ,m_nBlockStart(-1)
+    ,m_nBlockLen(-1)
+{
+    OSL_ENSURE(m_xOutStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
+    if (m_xOutStream.is() && m_xMarkStream.is())
+    {
+        m_nBlockStart = m_xMarkStream->createMark();
+        m_nBlockLen = 0;
+        m_xOutStream->writeLong(m_nBlockLen);
+    }
+}
+
+
+OStreamSection::~OStreamSection()
+{
+    try
+    {   // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception
+        // handling routing
+        if (m_xInStream.is() &&  m_xMarkStream.is())
+        {   // we're working on an input stream
+            m_xMarkStream->jumpToMark(m_nBlockStart);
+            m_xInStream->skipBytes(m_nBlockLen);
+            m_xMarkStream->deleteMark(m_nBlockStart);
+        }
+        else if (m_xOutStream.is() && m_xMarkStream.is())
+        {
+            sal_Int32 nRealBlockLength = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen);
+            m_nBlockLen = nRealBlockLength;
+            m_xMarkStream->jumpToMark(m_nBlockStart);
+            m_xOutStream->writeLong(m_nBlockLen);
+            m_xMarkStream->jumpToFurthest();
+            m_xMarkStream->deleteMark(m_nBlockStart);
+        }
+    }
+    catch(const css::uno::Exception&)
+    {
+    }
+}
+
+
+}   // namespace comphelper
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */