64 lines
2 KiB
C++
64 lines
2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <tools/stream.hxx>
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#include <tools/vcompat.hxx>
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VersionCompat::VersionCompat( SvStream& rStm, sal_uInt16 nStreamMode, sal_uInt16 nVersion ) :
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mpRWStm ( &rStm ),
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mnStmMode ( nStreamMode ),
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mnVersion ( nVersion )
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{
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if( !mpRWStm->GetError() )
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{
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if( STREAM_WRITE == mnStmMode )
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{
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*mpRWStm << mnVersion;
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mnTotalSize = ( mnCompatPos = mpRWStm->Tell() ) + 4UL;
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mpRWStm->SeekRel( 4L );
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}
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else
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{
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*mpRWStm >> mnVersion;
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*mpRWStm >> mnTotalSize;
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mnCompatPos = mpRWStm->Tell();
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}
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}
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}
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VersionCompat::~VersionCompat()
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{
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if( STREAM_WRITE == mnStmMode )
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{
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const sal_uInt32 nEndPos = mpRWStm->Tell();
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mpRWStm->Seek( mnCompatPos );
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*mpRWStm << ( nEndPos - mnTotalSize );
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mpRWStm->Seek( nEndPos );
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}
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else
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{
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const sal_uInt32 nReadSize = mpRWStm->Tell() - mnCompatPos;
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if( mnTotalSize > nReadSize )
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mpRWStm->SeekRel( mnTotalSize - nReadSize );
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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