108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/* LzFind.h -- Match finder for LZ algorithms
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2009-04-22 : Igor Pavlov : Public domain */
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#ifndef __LZ_FIND_H
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#define __LZ_FIND_H
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#include "Types.h"
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typedef uint32_t CLzRef;
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struct CMatchFinder
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{
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uint8_t *buffer;
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uint32_t pos;
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uint32_t posLimit;
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uint32_t streamPos;
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uint32_t lenLimit;
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uint32_t cyclicBufferPos;
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uint32_t cyclicBufferSize; /* it must be = (historySize + 1) */
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uint32_t matchMaxLen;
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CLzRef *hash;
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CLzRef *son;
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uint32_t hashMask;
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uint32_t cutValue;
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uint8_t *bufferBase;
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struct ISeqInStream *stream;
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int streamEndWasReached;
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uint32_t blockSize;
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uint32_t keepSizeBefore;
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uint32_t keepSizeAfter;
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uint32_t numHashBytes;
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int directInput;
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size_t directInputRem;
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int btMode;
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int bigHash;
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uint32_t historySize;
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uint32_t fixedHashSize;
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uint32_t hashSizeSum;
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uint32_t numSons;
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SRes result;
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uint32_t crc[256];
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};
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#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
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#define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(int32_t)(index)])
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#define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
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int MatchFinder_NeedMove(struct CMatchFinder *p);
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uint8_t *MatchFinder_GetPointerToCurrentPos(struct CMatchFinder *p);
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void MatchFinder_MoveBlock(struct CMatchFinder *p);
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void MatchFinder_ReadIfRequired(struct CMatchFinder *p);
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void MatchFinder_Construct(struct CMatchFinder *p);
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/* Conditions:
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historySize <= 3 GB
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keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
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*/
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int MatchFinder_Create(struct CMatchFinder *p, uint32_t historySize,
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uint32_t keepAddBufferBefore, uint32_t matchMaxLen, uint32_t keepAddBufferAfter,
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struct ISzAlloc *alloc);
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void MatchFinder_Free(struct CMatchFinder *p, struct ISzAlloc *alloc);
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void MatchFinder_Normalize3(uint32_t subValue, CLzRef *items, uint32_t numItems);
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void MatchFinder_ReduceOffsets(struct CMatchFinder *p, uint32_t subValue);
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uint32_t * GetMatchesSpec1(uint32_t lenLimit, uint32_t curMatch, uint32_t pos, const uint8_t *buffer, CLzRef *son,
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uint32_t _cyclicBufferPos, uint32_t _cyclicBufferSize, uint32_t _cutValue,
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uint32_t *distances, uint32_t maxLen);
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/*
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Conditions:
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Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
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Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
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*/
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typedef void (*Mf_Init_Func)(void *object);
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typedef uint8_t (*Mf_GetIndexByte_Func)(void *object, int32_t index);
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typedef uint32_t (*Mf_GetNumAvailableBytes_Func)(void *object);
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typedef const uint8_t * (*Mf_GetPointerToCurrentPos_Func)(void *object);
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typedef uint32_t (*Mf_GetMatches_Func)(void *object, uint32_t *distances);
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typedef void (*Mf_Skip_Func)(void *object, uint32_t);
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struct IMatchFinder
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{
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Mf_Init_Func Init;
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Mf_GetIndexByte_Func GetIndexByte;
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Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
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Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
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Mf_GetMatches_Func GetMatches;
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Mf_Skip_Func Skip;
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};
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void MatchFinder_CreateVTable(struct CMatchFinder *p, struct IMatchFinder *vTable);
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void MatchFinder_Init(struct CMatchFinder *p);
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uint32_t Bt3Zip_MatchFinder_GetMatches(struct CMatchFinder *p, uint32_t *distances);
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uint32_t Hc3Zip_MatchFinder_GetMatches(struct CMatchFinder *p, uint32_t *distances);
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void Bt3Zip_MatchFinder_Skip(struct CMatchFinder *p, uint32_t num);
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void Hc3Zip_MatchFinder_Skip(struct CMatchFinder *p, uint32_t num);
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#endif
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