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
112