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122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/* LzFind.h -- Match finder for LZ algorithms
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2017-06-10 : 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 "7zTypes.h"
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EXTERN_C_BEGIN
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typedef uint32_t CLzRef;
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typedef struct _CMatchFinder
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{
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Byte *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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Byte streamEndWasReached;
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Byte btMode;
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Byte bigHash;
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Byte directInput;
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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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Byte *bufferBase;
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ISeqInStream *stream;
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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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size_t directInputRem;
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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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SRes result;
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uint32_t crc[256];
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size_t numRefs;
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uint64_t expectedDataSize;
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} CMatchFinder;
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#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
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#define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
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#define Inline_MatchFinder_IsFinishedOK(p) \
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((p)->streamEndWasReached \
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&& (p)->streamPos == (p)->pos \
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&& (!(p)->directInput || (p)->directInputRem == 0))
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int MatchFinder_NeedMove(CMatchFinder *p);
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Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);
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void MatchFinder_MoveBlock(CMatchFinder *p);
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void MatchFinder_ReadIfRequired(CMatchFinder *p);
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void MatchFinder_Construct(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(CMatchFinder *p, uint32_t historySize,
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uint32_t keepAddBufferBefore, uint32_t matchMaxLen, uint32_t keepAddBufferAfter,
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ISzAllocPtr alloc);
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void MatchFinder_Free(CMatchFinder *p, ISzAllocPtr alloc);
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void MatchFinder_Normalize3(uint32_t subValue, CLzRef *items, size_t numItems);
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void MatchFinder_ReduceOffsets(CMatchFinder *p, uint32_t subValue);
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uint32_t * GetMatchesSpec1(uint32_t lenLimit, uint32_t curMatch, uint32_t pos, const Byte *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 uint32_t (*Mf_GetNumAvailableBytes_Func)(void *object);
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typedef const Byte * (*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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typedef struct _IMatchFinder
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{
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Mf_Init_Func Init;
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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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} IMatchFinder;
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void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
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void MatchFinder_Init_LowHash(CMatchFinder *p);
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void MatchFinder_Init_HighHash(CMatchFinder *p);
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void MatchFinder_Init_3(CMatchFinder *p, int readData);
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void MatchFinder_Init(CMatchFinder *p);
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uint32_t Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, uint32_t *distances);
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uint32_t Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, uint32_t *distances);
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void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, uint32_t num);
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void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, uint32_t num);
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EXTERN_C_END
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#endif
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