svx/source/gallery2/codec.cxx

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  28
  29 // MARKER(update_precomp.py): autogen include statement, do not remove
  30 #include "precompiled_svx.hxx"
  31
  32 #include <tools/stream.hxx>
  33 #include <tools/zcodec.hxx>
  34 #include "codec.hxx"
  35
  36 // ----------------
  37 // - GalleryCodec -
  38 // ----------------
  39
  40 GalleryCodec::GalleryCodec( SvStream& rIOStm ) :
  41     rStm( rIOStm )
  42 {
  43 }
  44
  45 // -----------------------------------------------------------------------------
  46
  47 GalleryCodec::~GalleryCodec()
  48 {
  49 }
  50
  51 // -----------------------------------------------------------------------------
  52
  53 sal_Bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
  54 {
  55     const sal_uIntPtr   nPos = rStm.Tell();
  56     sal_Bool        bRet;
  57     sal_uInt8       cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;
  58
  59     rStm >> cByte1 >> cByte2 >> cByte3 >> cByte4 >> cByte5 >> cByte6;
  60
  61     if ( cByte1 == 'S' && cByte2 == 'V' && cByte3 == 'R' && cByte4 == 'L' && cByte5 == 'E' && ( cByte6 == '1' || cByte6 == '2' ) )
  62     {
  63         rVersion = ( ( cByte6 == '1' ) ? 1 : 2 );
  64         bRet = sal_True;
  65     }
  66     else
  67     {
  68         rVersion = 0;
  69         bRet = sal_False;
  70     }
  71
  72     rStm.Seek( nPos );
  73
  74     return bRet;
  75 }
  76
  77 // -----------------------------------------------------------------------------
  78
  79 void GalleryCodec::Write( SvStream& rStmToWrite )
  80 {
  81     sal_uInt32 nPos, nCompSize;
  82
  83     rStmToWrite.Seek( STREAM_SEEK_TO_END );
  84     const sal_uInt32 nSize = rStmToWrite.Tell();
  85     rStmToWrite.Seek( 0UL );
  86
  87     rStm << 'S' << 'V' << 'R' << 'L' << 'E' << '2';
  88     rStm << nSize;
  89
  90     nPos = rStm.Tell();
  91     rStm.SeekRel( 4UL );
  92
  93     ZCodec aCodec;
  94     aCodec.BeginCompression();
  95     aCodec.Compress( rStmToWrite, rStm );
  96     aCodec.EndCompression();
  97
  98     nCompSize = rStm.Tell() - nPos - 4UL;
  99     rStm.Seek( nPos );
 100     rStm << nCompSize;
 101     rStm.Seek( STREAM_SEEK_TO_END );
 102 }
 103
 104 // -----------------------------------------------------------------------------
 105
 106 void GalleryCodec::Read( SvStream& rStmToRead )
 107 {
 108     sal_uInt32 nVersion = 0;
 109
 110     if( IsCoded( rStm, nVersion ) )
 111     {
 112         sal_uInt32  nCompressedSize, nUnCompressedSize;
 113
 114         rStm.SeekRel( 6 );
 115         rStm >> nUnCompressedSize >> nCompressedSize;
 116
 117         // decompress
 118         if( 1 == nVersion )
 119         {
 120             sal_uInt8*   pCompressedBuffer = new sal_uInt8[ nCompressedSize ]; rStm.Read( pCompressedBuffer, nCompressedSize );
 121             sal_uInt8*  pInBuf = pCompressedBuffer;
 122             sal_uInt8*  pOutBuf = new sal_uInt8[ nUnCompressedSize ];
 123             sal_uInt8*  pTmpBuf = pOutBuf;
 124             sal_uInt8*  pLast = pOutBuf + nUnCompressedSize - 1;
 125             sal_uIntPtr   nIndex = 0UL, nCountByte, nRunByte;
 126             sal_Bool    bEndDecoding = sal_False;
 127
 128             do
 129             {
 130                 nCountByte = *pInBuf++;
 131
 132                 if ( !nCountByte )
 133                 {
 134                     nRunByte = *pInBuf++;
 135
 136                     if ( nRunByte > 2 )
 137                     {
 138                         // absolutes Fuellen
 139                         memcpy( &pTmpBuf[ nIndex ], pInBuf, nRunByte );
 140                         pInBuf += nRunByte;
 141                         nIndex += nRunByte;
 142
 143                         // WORD-Alignment beachten
 144                         if ( nRunByte & 1 )
 145                             pInBuf++;
 146                     }
 147                     else if ( nRunByte == 1 )   // Ende des Bildes
 148                         bEndDecoding = sal_True;
 149                 }
 150                 else
 151                 {
 152                     const sal_uInt8 cVal = *pInBuf++;
 153
 154                     memset( &pTmpBuf[ nIndex ], cVal, nCountByte );
 155                     nIndex += nCountByte;
 156                 }
 157             }
 158             while ( !bEndDecoding && ( pTmpBuf <= pLast ) );
 159
 160                rStmToRead.Write( pOutBuf, nUnCompressedSize );
 161
 162             delete[] pOutBuf;
 163             delete[] pCompressedBuffer;
 164         }
 165         else if( 2 == nVersion )
 166         {
 167             ZCodec aCodec;
 168
 169             aCodec.BeginCompression();
 170             aCodec.Decompress( rStm, rStmToRead );
 171             aCodec.EndCompression();
 172         }
 173     }
 174 }
 175
 176 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */