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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/zcodec.hxx>
#include "codec.hxx"
#include <memory>
GalleryCodec::GalleryCodec( SvStream& rIOStm ) :
rStm( rIOStm )
{
}
bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
{
const sal_uInt64 nPos = rStm.Tell();
bool bRet;
sal_uInt8 cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;
rStm.ReadUChar( cByte1 ).ReadUChar( cByte2 ).ReadUChar( cByte3 ).ReadUChar( cByte4 ).ReadUChar( cByte5 ).ReadUChar( cByte6 );
if ( cByte1 == 'S' && cByte2 == 'V' && cByte3 == 'R' && cByte4 == 'L' && cByte5 == 'E' && ( cByte6 == '1' || cByte6 == '2' ) )
{
rVersion = ( ( cByte6 == '1' ) ? 1 : 2 );
bRet = true;
}
else
{
rVersion = 0;
bRet = false;
}
rStm.Seek( nPos );
return bRet;
}
void GalleryCodec::Write( SvStream& rStmToWrite )
{
sal_uInt32 nPos, nCompSize;
const sal_uInt32 nSize = rStmToWrite.TellEnd();
rStmToWrite.Seek( 0 );
rStm.WriteChar( 'S' ).WriteChar( 'V' ).WriteChar( 'R' ).WriteChar( 'L' ).WriteChar( 'E' ).WriteChar( '2' );
rStm.WriteUInt32( nSize );
nPos = rStm.Tell();
rStm.SeekRel( 4 );
ZCodec aCodec;
aCodec.BeginCompression();
aCodec.Compress( rStmToWrite, rStm );
aCodec.EndCompression();
nCompSize = rStm.Tell() - nPos - 4;
rStm.Seek( nPos );
rStm.WriteUInt32( nCompSize );
rStm.Seek( STREAM_SEEK_TO_END );
}
void GalleryCodec::Read( SvStream& rStmToRead )
{
sal_uInt32 nVersion = 0;
if( !IsCoded( rStm, nVersion ) )
return;
sal_uInt32 nCompressedSize, nUnCompressedSize;
rStm.SeekRel( 6 );
rStm.ReadUInt32( nUnCompressedSize ).ReadUInt32( nCompressedSize );
// decompress
if( 1 == nVersion )
{
std::unique_ptr<sal_uInt8[]> pCompressedBuffer(new sal_uInt8[ nCompressedSize ]);
rStm.ReadBytes(pCompressedBuffer.get(), nCompressedSize);
sal_uInt8* pInBuf = pCompressedBuffer.get();
std::unique_ptr<sal_uInt8[]> pOutBuf(new sal_uInt8[ nUnCompressedSize ]);
sal_uInt8* pTmpBuf = pOutBuf.get();
sal_uInt8* pLast = pOutBuf.get() + nUnCompressedSize - 1;
sal_uIntPtr nIndex = 0, nCountByte, nRunByte;
bool bEndDecoding = false;
do
{
nCountByte = *pInBuf++;
if ( !nCountByte )
{
nRunByte = *pInBuf++;
if ( nRunByte > 2 )
{
// filling absolutely
memcpy( &pTmpBuf[ nIndex ], pInBuf, nRunByte );
pInBuf += nRunByte;
nIndex += nRunByte;
// note WORD alignment
if ( nRunByte & 1 )
pInBuf++;
}
else if ( nRunByte == 1 ) // End of the image
bEndDecoding = true;
}
else
{
const sal_uInt8 cVal = *pInBuf++;
memset( &pTmpBuf[ nIndex ], cVal, nCountByte );
nIndex += nCountByte;
}
}
while ( !bEndDecoding && ( pTmpBuf <= pLast ) );
rStmToRead.WriteBytes(pOutBuf.get(), nUnCompressedSize);
}
else if( 2 == nVersion )
{
ZCodec aCodec;
aCodec.BeginCompression();
aCodec.Decompress( rStm, rStmToRead );
aCodec.EndCompression();
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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