usr/src/common/lzma/LzFind.h

   1 /* LzFind.h -- Match finder for LZ algorithms
   2 2008-10-04 : Igor Pavlov : Public domain */
   3
   4 #ifndef __LZFIND_H
   5 #define __LZFIND_H
   6
   7 #include "Types.h"
   8
   9 typedef UInt32 CLzRef;
  10
  11 typedef struct _CMatchFinder
  12 {
  13   Byte *buffer;
  14   UInt32 pos;
  15   UInt32 posLimit;
  16   UInt32 streamPos;
  17   UInt32 lenLimit;
  18
  19   UInt32 cyclicBufferPos;
  20   UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */
  21
  22   UInt32 matchMaxLen;
  23   CLzRef *hash;
  24   CLzRef *son;
  25   UInt32 hashMask;
  26   UInt32 cutValue;
  27
  28   Byte *bufferBase;
  29   ISeqInStream *stream;
  30   int streamEndWasReached;
  31
  32   UInt32 blockSize;
  33   UInt32 keepSizeBefore;
  34   UInt32 keepSizeAfter;
  35
  36   UInt32 numHashBytes;
  37   int directInput;
  38   int btMode;
  39   /* int skipModeBits; */
  40   int bigHash;
  41   UInt32 historySize;
  42   UInt32 fixedHashSize;
  43   UInt32 hashSizeSum;
  44   UInt32 numSons;
  45   SRes result;
  46   UInt32 crc[256];
  47 } CMatchFinder;
  48
  49 #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
  50 #define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)])
  51
  52 #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
  53
  54 int MatchFinder_NeedMove(CMatchFinder *p);
  55 Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);
  56 void MatchFinder_MoveBlock(CMatchFinder *p);
  57 void MatchFinder_ReadIfRequired(CMatchFinder *p);
  58
  59 void MatchFinder_Construct(CMatchFinder *p);
  60
  61 /* Conditions:
  62      historySize <= 3 GB
  63      keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
  64 */
  65 int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
  66     UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
  67     ISzAlloc *alloc);
  68 void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc);
  69 void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems);
  70 void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
  71
  72 UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
  73     UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
  74     UInt32 *distances, UInt32 maxLen);
  75
  76 /*
  77 Conditions:
  78   Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
  79   Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
  80 */
  81
  82 typedef void (*Mf_Init_Func)(void *object);
  83 typedef Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index);
  84 typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
  85 typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
  86 typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
  87 typedef void (*Mf_Skip_Func)(void *object, UInt32);
  88
  89 typedef struct _IMatchFinder
  90 {
  91   Mf_Init_Func Init;
  92   Mf_GetIndexByte_Func GetIndexByte;
  93   Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
  94   Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
  95   Mf_GetMatches_Func GetMatches;
  96   Mf_Skip_Func Skip;
  97 } IMatchFinder;
  98
  99 void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
 100
 101 void MatchFinder_Init(CMatchFinder *p);
 102 UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
 103 UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
 104 void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
 105 void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
 106
 107 #endif