206 lines
6.2 KiB
C++
206 lines
6.2 KiB
C++
/*************************************************************************
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*
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* $RCSfile: codec.cxx,v $
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*
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* $Revision: 1.3 $
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*
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* last change: $Author: ka $ $Date: 2001-11-08 19:00:17 $
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*
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* The Contents of this file are made available subject to the terms of
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* either of the following licenses
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*
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* - GNU Lesser General Public License Version 2.1
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* - Sun Industry Standards Source License Version 1.1
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*
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* Sun Microsystems Inc., October, 2000
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2000 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*
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* Sun Industry Standards Source License Version 1.1
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* =================================================
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* The contents of this file are subject to the Sun Industry Standards
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* Source License Version 1.1 (the "License"); You may not use this file
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* except in compliance with the License. You may obtain a copy of the
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* License at http://www.openoffice.org/license.html.
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*
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* Software provided under this License is provided on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
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* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
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* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
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* See the License for the specific provisions governing your rights and
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* obligations concerning the Software.
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*
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* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
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*
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* Copyright: 2000 by Sun Microsystems, Inc.
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*
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* All Rights Reserved.
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*
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* Contributor(s): _______________________________________
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*
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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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BOOL GalleryCodec::IsCoded( SvStream& rStm, UINT32& rVersion )
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{
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const ULONG nPos = rStm.Tell();
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BOOL bRet;
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BYTE 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 = 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 = 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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UINT32 nPos, nCompSize;
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rStmToWrite.Seek( STREAM_SEEK_TO_END );
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const 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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UINT32 nVersion = 0;
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if( IsCoded( rStm, nVersion ) )
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{
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BYTE* pUnCompressedBuffer = NULL;
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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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BYTE* pCompressedBuffer = new BYTE[ nCompressedSize ]; rStm.Read( pCompressedBuffer, nCompressedSize );
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BYTE* pInBuf = pCompressedBuffer;
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BYTE* pOutBuf = new BYTE[ nUnCompressedSize ];
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BYTE* pTmpBuf = pOutBuf;
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BYTE* pLast = pOutBuf + nUnCompressedSize - 1;
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ULONG nIndex = 0UL, nCountByte, nRunByte;
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BOOL bEndDecoding = 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 = TRUE;
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}
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else
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{
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const BYTE 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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