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159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/* LzFind.h -- Match finder for LZ algorithms
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2023-03-04 : Igor Pavlov : Public domain */
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#ifndef ZIP7_INC_LZ_FIND_H
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#define ZIP7_INC_LZ_FIND_H
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#include "7zTypes.h"
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EXTERN_C_BEGIN
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typedef UInt32 CLzRef;
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typedef struct
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{
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const Byte *buffer;
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UInt32 pos;
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UInt32 posLimit;
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UInt32 streamPos; /* wrap over Zero is allowed (streamPos < pos). Use (UInt32)(streamPos - pos) */
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UInt32 lenLimit;
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UInt32 cyclicBufferPos;
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UInt32 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 matchMaxLen;
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CLzRef *hash;
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CLzRef *son;
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UInt32 hashMask;
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UInt32 cutValue;
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Byte *bufBase;
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ISeqInStreamPtr stream;
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UInt32 blockSize;
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UInt32 keepSizeBefore;
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UInt32 keepSizeAfter;
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UInt32 numHashBytes;
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size_t directInputRem;
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UInt32 historySize;
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UInt32 fixedHashSize;
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Byte numHashBytes_Min;
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Byte numHashOutBits;
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Byte _pad2_[2];
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SRes result;
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UInt32 crc[256];
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size_t numRefs;
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UInt64 expectedDataSize;
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} CMatchFinder;
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#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((const Byte *)(p)->buffer)
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#define Inline_MatchFinder_GetNumAvailableBytes(p) ((UInt32)((p)->streamPos - (p)->pos))
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/*
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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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*/
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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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/* (directInput = 0) is default value.
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It's required to provide correct (directInput) value
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before calling MatchFinder_Create().
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You can set (directInput) by any of the following calls:
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- MatchFinder_SET_DIRECT_INPUT_BUF()
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- MatchFinder_SET_STREAM()
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- MatchFinder_SET_STREAM_MODE()
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*/
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#define MatchFinder_SET_DIRECT_INPUT_BUF(p, _src_, _srcLen_) { \
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(p)->stream = NULL; \
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(p)->directInput = 1; \
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(p)->buffer = (_src_); \
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(p)->directInputRem = (_srcLen_); }
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/*
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#define MatchFinder_SET_STREAM_MODE(p) { \
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(p)->directInput = 0; }
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*/
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#define MatchFinder_SET_STREAM(p, _stream_) { \
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(p)->stream = _stream_; \
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(p)->directInput = 0; }
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int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
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UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 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 subValue, CLzRef *items, size_t numItems);
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/*
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#define MatchFinder_INIT_POS(p, val) \
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(p)->pos = (val); \
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(p)->streamPos = (val);
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*/
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// void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
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#define MatchFinder_REDUCE_OFFSETS(p, subValue) \
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(p)->pos -= (subValue); \
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(p)->streamPos -= (subValue);
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UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
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size_t _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
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UInt32 *distances, UInt32 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 (*Mf_GetNumAvailableBytes_Func)(void *object);
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typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
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typedef UInt32 * (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
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typedef void (*Mf_Skip_Func)(void *object, UInt32);
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typedef struct
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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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} IMatchFinder2;
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void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder2 *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_4(CMatchFinder *p);
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void MatchFinder_Init(CMatchFinder *p);
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UInt32* Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
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UInt32* Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
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void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
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void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
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void LzFindPrepare(void);
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EXTERN_C_END
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#endif
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