1/* LzFind.h -- Match finder for LZ algorithms
  22013-01-18 : Igor Pavlov : Public domain */
  3
  4#ifndef __LZ_FIND_H
  5#define __LZ_FIND_H
  6
  7#include "7zTypes.h"
  8
  9EXTERN_C_BEGIN
 10
 11typedef UInt32 CLzRef;
 12
 13typedef 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  UInt32 matchMaxLen;
 25  CLzRef *hash;
 26  CLzRef *son;
 27  UInt32 hashMask;
 28  UInt32 cutValue;
 29
 30  Byte *bufferBase;
 31  ISeqInStream *stream;
 32  int streamEndWasReached;
 33
 34  UInt32 blockSize;
 35  UInt32 keepSizeBefore;
 36  UInt32 keepSizeAfter;
 37
 38  UInt32 numHashBytes;
 39  int directInput;
 40  size_t directInputRem;
 41  int btMode;
 42  int bigHash;
 43  UInt32 historySize;
 44  UInt32 fixedHashSize;
 45  UInt32 hashSizeSum;
 46  UInt32 numSons;
 47  SRes result;
 48  UInt32 crc[256];
 49} CMatchFinder;
 50
 51#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
 52#define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)])
 53
 54#define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
 55
 56int MatchFinder_NeedMove(CMatchFinder *p);
 57Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);
 58void MatchFinder_MoveBlock(CMatchFinder *p);
 59void MatchFinder_ReadIfRequired(CMatchFinder *p);
 60
 61void MatchFinder_Construct(CMatchFinder *p);
 62
 63/* Conditions:
 64     historySize <= 3 GB
 65     keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
 66*/
 67int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
 68    UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
 69    ISzAlloc *alloc);
 70void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc);
 71void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems);
 72void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
 73
 74UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
 75    UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
 76    UInt32 *distances, UInt32 maxLen);
 77
 78/*
 79Conditions:
 80  Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
 81  Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
 82*/
 83
 84typedef void (*Mf_Init_Func)(void *object);
 85typedef Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index);
 86typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
 87typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
 88typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
 89typedef void (*Mf_Skip_Func)(void *object, UInt32);
 90
 91typedef struct _IMatchFinder
 92{
 93  Mf_Init_Func Init;
 94  Mf_GetIndexByte_Func GetIndexByte;
 95  Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
 96  Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
 97  Mf_GetMatches_Func GetMatches;
 98  Mf_Skip_Func Skip;
 99} IMatchFinder;
100
101void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
102
103void MatchFinder_Init(CMatchFinder *p);
104UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
105UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
106void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
107void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
108
109EXTERN_C_END
110
111#endif