1 /* LzFind.h -- Match finder for LZ algorithms
2 2009-04-22 : Igor Pavlov : Public domain */
13 typedef UInt32 CLzRef;
15 typedef struct _CMatchFinder
23 UInt32 cyclicBufferPos;
24 UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */
34 int streamEndWasReached;
37 UInt32 keepSizeBefore;
42 size_t directInputRem;
53 #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
54 #define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)])
56 #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
58 int MatchFinder_NeedMove(CMatchFinder *p);
59 Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);
60 void MatchFinder_MoveBlock(CMatchFinder *p);
61 void MatchFinder_ReadIfRequired(CMatchFinder *p);
63 void MatchFinder_Construct(CMatchFinder *p);
67 keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
69 int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
70 UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
72 void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc);
73 void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems);
74 void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
76 UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
77 UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
78 UInt32 *distances, UInt32 maxLen);
82 Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
83 Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
86 typedef void (*Mf_Init_Func)(void *object);
87 typedef Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index);
88 typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
89 typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
90 typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
91 typedef void (*Mf_Skip_Func)(void *object, UInt32);
93 typedef struct _IMatchFinder
96 Mf_GetIndexByte_Func GetIndexByte;
97 Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
98 Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
99 Mf_GetMatches_Func GetMatches;
103 void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
105 void MatchFinder_Init(CMatchFinder *p);
106 UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
107 UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
108 void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
109 void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);