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view libs/openctm/liblzma/LzFind.h @ 55:af1310ed212b

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 19 Jan 2014 14:56:44 +0200
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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