nel/3rdparty/seven_zip/LzFind.h

   1 /* LzFind.h -- Match finder for LZ algorithms
   2 2017-06-10 : Igor Pavlov : Public domain */
   3
   4 #ifndef __LZ_FIND_H
   5 #define __LZ_FIND_H
   6
   7 #include "7zTypes.h"
   8
   9 EXTERN_C_BEGIN
  10
  11 typedef UInt32 CLzRef;
  12
  13 typedef struct _CMatchFinder
  14 {
  15   Byte *buffer;
  16   UInt32 pos;
  17   UInt32 posLimit;
  18   UInt32 streamPos;
  19   UInt32 lenLimit;
  20
  21   UInt32 cyclicBufferPos;
  22   UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */
  23
  24   Byte streamEndWasReached;
  25   Byte btMode;
  26   Byte bigHash;
  27   Byte directInput;
  28
  29   UInt32 matchMaxLen;
  30   CLzRef *hash;
  31   CLzRef *son;
  32   UInt32 hashMask;
  33   UInt32 cutValue;
  34
  35   Byte *bufferBase;
  36   ISeqInStream *stream;
  37
  38   UInt32 blockSize;
  39   UInt32 keepSizeBefore;
  40   UInt32 keepSizeAfter;
  41
  42   UInt32 numHashBytes;
  43   size_t directInputRem;
  44   UInt32 historySize;
  45   UInt32 fixedHashSize;
  46   UInt32 hashSizeSum;
  47   SRes result;
  48   UInt32 crc[256];
  49   size_t numRefs;
  50
  51   UInt64 expectedDataSize;
  52 } CMatchFinder;
  53
  54 #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
  55
  56 #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
  57
  58 #define Inline_MatchFinder_IsFinishedOK(p) \
  59     ((p)->streamEndWasReached \
  60         && (p)->streamPos == (p)->pos \
  61         && (!(p)->directInput || (p)->directInputRem == 0))
  62
  63 int MatchFinder_NeedMove(CMatchFinder *p);
  64 Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);
  65 void MatchFinder_MoveBlock(CMatchFinder *p);
  66 void MatchFinder_ReadIfRequired(CMatchFinder *p);
  67
  68 void MatchFinder_Construct(CMatchFinder *p);
  69
  70 /* Conditions:
  71      historySize <= 3 GB
  72      keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
  73 */
  74 int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
  75     UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
  76     ISzAllocPtr alloc);
  77 void MatchFinder_Free(CMatchFinder *p, ISzAllocPtr alloc);
  78 void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems);
  79 void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
  80
  81 UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
  82     UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
  83     UInt32 *distances, UInt32 maxLen);
  84
  85 /*
  86 Conditions:
  87   Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
  88   Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
  89 */
  90
  91 typedef void (*Mf_Init_Func)(void *object);
  92 typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
  93 typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
  94 typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
  95 typedef void (*Mf_Skip_Func)(void *object, UInt32);
  96
  97 typedef struct _IMatchFinder
  98 {
  99   Mf_Init_Func Init;
 100   Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
 101   Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
 102   Mf_GetMatches_Func GetMatches;
 103   Mf_Skip_Func Skip;
 104 } IMatchFinder;
 105
 106 void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
 107
 108 void MatchFinder_Init_LowHash(CMatchFinder *p);
 109 void MatchFinder_Init_HighHash(CMatchFinder *p);
 110 void MatchFinder_Init_3(CMatchFinder *p, int readData);
 111 void MatchFinder_Init(CMatchFinder *p);
 112
 113 UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
 114 UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
 115
 116 void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
 117 void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
 118
 119 EXTERN_C_END
 120
 121 #endif