174 lines
5.1 KiB
C++
174 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#include <tools/stream.hxx>
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#include <tools/zcodec.hxx>
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#include "codec.hxx"
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// ----------------
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// - GalleryCodec -
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// ----------------
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GalleryCodec::GalleryCodec( SvStream& rIOStm ) :
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rStm( rIOStm )
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{
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}
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// -----------------------------------------------------------------------------
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GalleryCodec::~GalleryCodec()
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{
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}
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// -----------------------------------------------------------------------------
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sal_Bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
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{
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const sal_uIntPtr nPos = rStm.Tell();
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sal_Bool bRet;
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sal_uInt8 cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;
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rStm >> cByte1 >> cByte2 >> cByte3 >> cByte4 >> cByte5 >> cByte6;
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if ( cByte1 == 'S' && cByte2 == 'V' && cByte3 == 'R' && cByte4 == 'L' && cByte5 == 'E' && ( cByte6 == '1' || cByte6 == '2' ) )
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{
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rVersion = ( ( cByte6 == '1' ) ? 1 : 2 );
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bRet = sal_True;
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}
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else
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{
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rVersion = 0;
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bRet = sal_False;
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}
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rStm.Seek( nPos );
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return bRet;
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}
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// -----------------------------------------------------------------------------
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void GalleryCodec::Write( SvStream& rStmToWrite )
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{
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sal_uInt32 nPos, nCompSize;
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rStmToWrite.Seek( STREAM_SEEK_TO_END );
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const sal_uInt32 nSize = rStmToWrite.Tell();
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rStmToWrite.Seek( 0UL );
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rStm << 'S' << 'V' << 'R' << 'L' << 'E' << '2';
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rStm << nSize;
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nPos = rStm.Tell();
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rStm.SeekRel( 4UL );
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ZCodec aCodec;
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aCodec.BeginCompression();
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aCodec.Compress( rStmToWrite, rStm );
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aCodec.EndCompression();
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nCompSize = rStm.Tell() - nPos - 4UL;
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rStm.Seek( nPos );
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rStm << nCompSize;
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rStm.Seek( STREAM_SEEK_TO_END );
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}
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// -----------------------------------------------------------------------------
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void GalleryCodec::Read( SvStream& rStmToRead )
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{
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sal_uInt32 nVersion = 0;
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if( IsCoded( rStm, nVersion ) )
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{
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sal_uInt32 nCompressedSize, nUnCompressedSize;
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rStm.SeekRel( 6 );
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rStm >> nUnCompressedSize >> nCompressedSize;
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// decompress
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if( 1 == nVersion )
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{
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sal_uInt8* pCompressedBuffer = new sal_uInt8[ nCompressedSize ]; rStm.Read( pCompressedBuffer, nCompressedSize );
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sal_uInt8* pInBuf = pCompressedBuffer;
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sal_uInt8* pOutBuf = new sal_uInt8[ nUnCompressedSize ];
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sal_uInt8* pTmpBuf = pOutBuf;
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sal_uInt8* pLast = pOutBuf + nUnCompressedSize - 1;
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sal_uIntPtr nIndex = 0UL, nCountByte, nRunByte;
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sal_Bool bEndDecoding = sal_False;
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do
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{
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nCountByte = *pInBuf++;
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if ( !nCountByte )
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{
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nRunByte = *pInBuf++;
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if ( nRunByte > 2 )
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{
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// absolutes Fuellen
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memcpy( &pTmpBuf[ nIndex ], pInBuf, nRunByte );
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pInBuf += nRunByte;
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nIndex += nRunByte;
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// WORD-Alignment beachten
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if ( nRunByte & 1 )
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pInBuf++;
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}
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else if ( nRunByte == 1 ) // Ende des Bildes
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bEndDecoding = sal_True;
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}
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else
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{
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const sal_uInt8 cVal = *pInBuf++;
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memset( &pTmpBuf[ nIndex ], cVal, nCountByte );
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nIndex += nCountByte;
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}
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}
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while ( !bEndDecoding && ( pTmpBuf <= pLast ) );
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rStmToRead.Write( pOutBuf, nUnCompressedSize );
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delete[] pOutBuf;
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delete[] pCompressedBuffer;
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}
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else if( 2 == nVersion )
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{
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ZCodec aCodec;
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aCodec.BeginCompression();
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aCodec.Decompress( rStm, rStmToRead );
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aCodec.EndCompression();
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}
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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