goodies/source/filter.vcl/itiff/lzwdecom.hxx

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  30
  31 #ifndef _LZWDECOM_HXX
  32 #define _LZWDECOM_HXX
  33
  34 #include <tools/stream.hxx>
  35
  36 struct LZWTableEntry {
  37     USHORT nPrevCode;
  38     USHORT nDataCount;
  39     BYTE nData;
  40 };
  41
  42 class LZWDecompressor {
  43
  44 public:
  45
  46     LZWDecompressor();
  47     ~LZWDecompressor();
  48
  49     void StartDecompression(SvStream & rIStream);
  50
  51     ULONG Decompress(BYTE * pTarget, ULONG nMaxCount);
  52         // Liefert die Anzahl der geschriebenen Bytes, wenn < nMaxCount,
  53         // sind keine weiteren Daten zu entpacken, oder es ist ein
  54         // Fehler aufgetreten.
  55
  56 private:
  57
  58     USHORT GetNextCode();
  59     void AddToTable(USHORT nPrevCode, USHORT nCodeFirstData);
  60     void DecompressSome();
  61
  62     SvStream * pIStream;
  63
  64     LZWTableEntry * pTable;
  65     USHORT nTableSize;
  66
  67     BOOL bEOIFound, bInvert, bFirst;
  68
  69     USHORT nOldCode;
  70
  71     BYTE * pOutBuf;
  72     BYTE * pOutBufData;
  73     USHORT nOutBufDataLen;
  74
  75     BYTE nInputBitsBuf;
  76     USHORT nInputBitsBufSize;
  77 };
  78
  79
  80 #endif
  81
  82