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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 <tools/stream.hxx>
#include <tools/vcompat.hxx>
VersionCompat::VersionCompat( SvStream& rStm, StreamMode nStreamMode, sal_uInt16 nVersion ) :
mpRWStm ( &rStm ),
mnCompatPos ( 0 ),
mnTotalSize ( 0 ),
mnStmMode ( nStreamMode ),
mnVersion ( nVersion )
{
if( !mpRWStm->GetError() )
{
if( StreamMode::WRITE == mnStmMode )
{
mpRWStm->WriteUInt16( mnVersion );
mnCompatPos = mpRWStm->Tell();
mnTotalSize = mnCompatPos + 4;
mpRWStm->SeekRel( 4 );
}
else
{
mpRWStm->ReadUInt16( mnVersion );
mpRWStm->ReadUInt32( mnTotalSize );
mnCompatPos = mpRWStm->Tell();
}
}
}
VersionCompat::~VersionCompat()
{
if( StreamMode::WRITE == mnStmMode )
{
const sal_uInt32 nEndPos = mpRWStm->Tell();
mpRWStm->Seek( mnCompatPos );
mpRWStm->WriteUInt32( nEndPos - mnTotalSize );
mpRWStm->Seek( nEndPos );
}
else
{
const sal_uInt32 nReadSize = mpRWStm->Tell() - mnCompatPos;
if( mnTotalSize > nReadSize )
mpRWStm->SeekRel( mnTotalSize - nReadSize );
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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