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diff --git a/oox/source/ole/axbinaryreader.cxx b/oox/source/ole/axbinaryreader.cxx
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+++ b/oox/source/ole/axbinaryreader.cxx
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+/* -*- 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 <oox/ole/axbinaryreader.hxx>
+
+#include <oox/ole/axfontdata.hxx>
+#include <oox/ole/olehelper.hxx>
+
+#include <osl/diagnose.h>
+
+namespace oox::ole {
+
+namespace {
+
+const sal_uInt32 AX_STRING_SIZEMASK         = 0x7FFFFFFF;
+const sal_uInt32 AX_STRING_COMPRESSED       = 0x80000000;
+
+} // namespace
+
+AxAlignedInputStream::AxAlignedInputStream( BinaryInputStream& rInStrm ) :
+    BinaryStreamBase( false ),
+    mpInStrm( &rInStrm ),
+    mnStrmPos( 0 ),
+    mnStrmSize( rInStrm.getRemaining() )
+{
+    mbEof = mbEof || rInStrm.isEof();
+}
+
+sal_Int64 AxAlignedInputStream::size() const
+{
+    return mpInStrm ? mnStrmSize : -1;
+}
+
+sal_Int64 AxAlignedInputStream::tell() const
+{
+    return mpInStrm ? mnStrmPos : -1;
+}
+
+void AxAlignedInputStream::seek( sal_Int64 nPos )
+{
+    mbEof = mbEof || (nPos < mnStrmPos);
+    if( !mbEof )
+        skip( static_cast< sal_Int32 >( nPos - mnStrmPos ) );
+}
+
+void AxAlignedInputStream::close()
+{
+    mpInStrm = nullptr;
+    mbEof = true;
+}
+
+sal_Int32 AxAlignedInputStream::readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize )
+{
+    sal_Int32 nReadSize = 0;
+    if( !mbEof )
+    {
+        nReadSize = mpInStrm->readData( orData, nBytes, nAtomSize );
+        mnStrmPos += nReadSize;
+        mbEof = mpInStrm->isEof();
+    }
+    return nReadSize;
+}
+
+sal_Int32 AxAlignedInputStream::readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize )
+{
+    sal_Int32 nReadSize = 0;
+    if( !mbEof )
+    {
+        nReadSize = mpInStrm->readMemory( opMem, nBytes, nAtomSize );
+        mnStrmPos += nReadSize;
+        mbEof = mpInStrm->isEof();
+    }
+    return nReadSize;
+}
+
+void AxAlignedInputStream::skip( sal_Int32 nBytes, size_t nAtomSize )
+{
+    if( !mbEof )
+    {
+        mpInStrm->skip( nBytes, nAtomSize );
+        mnStrmPos += nBytes;
+        mbEof = mpInStrm->isEof();
+    }
+}
+
+void AxAlignedInputStream::align( size_t nSize )
+{
+    skip( static_cast< sal_Int32 >( (nSize - (mnStrmPos % nSize)) % nSize ) );
+}
+
+namespace {
+
+bool lclReadString( AxAlignedInputStream& rInStrm, OUString& rValue, sal_uInt32 nSize, bool bArrayString )
+{
+    bool bCompressed = getFlag( nSize, AX_STRING_COMPRESSED );
+    sal_uInt32 nBufSize = nSize & AX_STRING_SIZEMASK;
+    // Unicode: simple strings store byte count, array strings store char count
+    sal_Int32 nChars = static_cast< sal_Int32 >( nBufSize / ((bCompressed || bArrayString) ? 1 : 2) );
+    bool bValidChars = nChars <= 65536;
+    OSL_ENSURE( bValidChars, "lclReadString - string too long" );
+    sal_Int64 nEndPos = rInStrm.tell() + nChars * (bCompressed ? 1 : 2);
+    nChars = ::std::min< sal_Int32 >( nChars, 65536 );
+    rValue = rInStrm.readCompressedUnicodeArray( nChars, bCompressed );
+    rInStrm.seek( nEndPos );
+    return bValidChars;
+}
+
+} // namespace
+
+AxBinaryPropertyReader::ComplexProperty::~ComplexProperty()
+{
+}
+
+bool AxBinaryPropertyReader::PairProperty::readProperty( AxAlignedInputStream& rInStrm )
+{
+    mrPairData.first = rInStrm.readInt32();
+    mrPairData.second = rInStrm.readInt32();
+    return true;
+}
+
+bool AxBinaryPropertyReader::StringProperty::readProperty( AxAlignedInputStream& rInStrm )
+{
+    return lclReadString( rInStrm, mrValue, mnSize, false );
+}
+
+bool AxBinaryPropertyReader::ArrayStringProperty::readProperty( AxAlignedInputStream& rInStrm )
+{
+    sal_Int64 nEndPos = rInStrm.tell() + mnSize;
+    while( rInStrm.tell() < nEndPos )
+    {
+        OUString aString;
+        if( !lclReadString( rInStrm, aString, rInStrm.readuInt32(), true ) )
+            return false;
+        mrArray.push_back( aString );
+        // every array string is aligned on 4 byte boundaries
+        rInStrm.align( 4 );
+    }
+    return true;
+}
+
+bool AxBinaryPropertyReader::GuidProperty::readProperty( AxAlignedInputStream& rInStrm )
+{
+    mrGuid = OleHelper::importGuid( rInStrm );
+    return true;
+}
+
+bool AxBinaryPropertyReader::FontProperty::readProperty( AxAlignedInputStream& rInStrm )
+{
+    return mrFontData.importGuidAndFont( rInStrm );
+}
+
+bool AxBinaryPropertyReader::PictureProperty::readProperty( AxAlignedInputStream& rInStrm )
+{
+    return OleHelper::importStdPic( mrPicData, rInStrm );
+}
+
+AxBinaryPropertyReader::AxBinaryPropertyReader( BinaryInputStream& rInStrm, bool b64BitPropFlags ) :
+    maInStrm( rInStrm ),
+    mbValid( true )
+{
+    // version and size of property block
+    maInStrm.skip( 2 );
+    sal_uInt16 nBlockSize = maInStrm.readuInt16();
+    mnPropsEnd = maInStrm.tell() + nBlockSize;
+    // flagfield containing existing properties
+    if( b64BitPropFlags )
+        mnPropFlags = maInStrm.readInt64();
+    else
+        mnPropFlags = maInStrm.readuInt32();
+    mnNextProp = 1;
+}
+
+void AxBinaryPropertyReader::readBoolProperty( bool& orbValue, bool bReverse )
+{
+    // there is no data, the boolean value is equivalent to the property flag itself
+    orbValue = startNextProperty() != bReverse;
+}
+
+void AxBinaryPropertyReader::readPairProperty( AxPairData& orPairData )
+{
+    if( startNextProperty() )
+        maLargeProps.push_back( ComplexPropVector::value_type( std::make_shared<PairProperty>( orPairData ) ) );
+}
+
+void AxBinaryPropertyReader::readStringProperty( OUString& orValue )
+{
+    if( startNextProperty() )
+    {
+        sal_uInt32 nSize = maInStrm.readAligned< sal_uInt32 >();
+        maLargeProps.push_back( ComplexPropVector::value_type( std::make_shared<StringProperty>( orValue, nSize ) ) );
+    }
+}
+
+void AxBinaryPropertyReader::readArrayStringProperty( std::vector<OUString>& orValue )
+{
+    if( startNextProperty() )
+    {
+        sal_uInt32 nSize = maInStrm.readAligned< sal_uInt32 >();
+        maLargeProps.push_back( ComplexPropVector::value_type( std::make_shared<ArrayStringProperty>( orValue, nSize ) ) );
+    }
+}
+
+void AxBinaryPropertyReader::readGuidProperty( OUString& orGuid )
+{
+    if( startNextProperty() )
+        maLargeProps.push_back( ComplexPropVector::value_type( std::make_shared<GuidProperty>( orGuid ) ) );
+}
+
+void AxBinaryPropertyReader::readFontProperty( AxFontData& orFontData )
+{
+    if( startNextProperty() )
+    {
+        sal_Int16 nData = maInStrm.readAligned< sal_Int16 >();
+        if( ensureValid( nData == -1 ) )
+            maStreamProps.push_back( ComplexPropVector::value_type( std::make_shared<FontProperty>( orFontData ) ) );
+    }
+}
+
+void AxBinaryPropertyReader::readPictureProperty( StreamDataSequence& orPicData )
+{
+    if( startNextProperty() )
+    {
+        sal_Int16 nData = maInStrm.readAligned< sal_Int16 >();
+        if( ensureValid( nData == -1 ) )
+            maStreamProps.push_back( ComplexPropVector::value_type( std::make_shared<PictureProperty>( orPicData ) ) );
+    }
+}
+
+bool AxBinaryPropertyReader::finalizeImport()
+{
+    // read large properties
+    maInStrm.align( 4 );
+    if( ensureValid( mnPropFlags == 0 ) )
+    {
+        for (auto const& largeProp : maLargeProps)
+        {
+            if (!ensureValid())
+                break;
+            ensureValid( largeProp->readProperty( maInStrm ) );
+            maInStrm.align( 4 );
+        }
+    }
+    maInStrm.seek( mnPropsEnd );
+
+    // read stream properties (no stream alignment between properties!)
+    if( ensureValid() )
+    {
+        for (auto const& streamProp : maStreamProps)
+        {
+            if (!ensureValid())
+                break;
+            ensureValid( streamProp->readProperty( maInStrm ) );
+        }
+    }
+
+    return mbValid;
+}
+
+bool AxBinaryPropertyReader::ensureValid( bool bCondition )
+{
+    mbValid = mbValid && bCondition && !maInStrm.isEof();
+    return mbValid;
+}
+
+bool AxBinaryPropertyReader::startNextProperty()
+{
+    bool bHasProp = getFlag( mnPropFlags, mnNextProp );
+    setFlag( mnPropFlags, mnNextProp, false );
+    mnNextProp <<= 1;
+    return ensureValid() && bHasProp;
+}
+
+} // namespace oox::ole
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */