release/src-rt-6.x/linux/linux-2.6/scripts/squashfs/lzma/C/7zip/Compress/LZ/HashChain/HC.h

   1 // HC.h
   2
   3 #include "../LZInWindow.h"
   4 #include "../IMatchFinder.h"
   5
   6 namespace HC_NAMESPACE {
   7
   8 typedef UInt32 CIndex;
   9 const UInt32 kMaxValForNormalize = (UInt32(1) << 31) - 1;
  10
  11 class CMatchFinderHC:
  12   public IMatchFinder,
  13   public IMatchFinderSetCallback,
  14   public CLZInWindow,
  15   public CMyUnknownImp
  16 {
  17   UInt32 _cyclicBufferPos;
  18   UInt32 _cyclicBufferSize; // it must be historySize + 1
  19   UInt32 _matchMaxLen;
  20   CIndex *_hash;
  21   UInt32 _cutValue;
  22
  23   CMyComPtr<IMatchFinderCallback> m_Callback;
  24
  25   void Normalize();
  26   void FreeThisClassMemory();
  27   void FreeMemory();
  28
  29   MY_UNKNOWN_IMP1(IMatchFinderSetCallback)
  30
  31   STDMETHOD(Init)(ISequentialInStream *inStream);
  32   STDMETHOD_(void, ReleaseStream)();
  33   STDMETHOD(MovePos)();
  34   STDMETHOD_(Byte, GetIndexByte)(Int32 index);
  35   STDMETHOD_(UInt32, GetMatchLen)(Int32 index, UInt32 back, UInt32 limit);
  36   STDMETHOD_(UInt32, GetNumAvailableBytes)();
  37   STDMETHOD_(const Byte *, GetPointerToCurrentPos)();
  38   STDMETHOD(Create)(UInt32 historySize, UInt32 keepAddBufferBefore,
  39       UInt32 matchMaxLen, UInt32 keepAddBufferAfter);
  40   STDMETHOD_(UInt32, GetLongestMatch)(UInt32 *distances);
  41   STDMETHOD_(void, DummyLongestMatch)();
  42
  43   // IMatchFinderSetCallback
  44   STDMETHOD(SetCallback)(IMatchFinderCallback *callback);
  45
  46   virtual void BeforeMoveBlock();
  47   virtual void AfterMoveBlock();
  48
  49 public:
  50   CMatchFinderHC();
  51   virtual ~CMatchFinderHC();
  52   void SetCutValue(UInt32 cutValue) { _cutValue = cutValue; }
  53 };
  54
  55 }