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Diffstat (limited to 'src/Common/lzma/LzFind.h')
-rw-r--r-- | src/Common/lzma/LzFind.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/src/Common/lzma/LzFind.h b/src/Common/lzma/LzFind.h new file mode 100644 index 00000000..a3f72c98 --- /dev/null +++ b/src/Common/lzma/LzFind.h @@ -0,0 +1,159 @@ +/* LzFind.h -- Match finder for LZ algorithms +2023-03-04 : Igor Pavlov : Public domain */ + +#ifndef ZIP7_INC_LZ_FIND_H +#define ZIP7_INC_LZ_FIND_H + +#include "7zTypes.h" + +EXTERN_C_BEGIN + +typedef UInt32 CLzRef; + +typedef struct +{ + const Byte *buffer; + UInt32 pos; + UInt32 posLimit; + UInt32 streamPos; /* wrap over Zero is allowed (streamPos < pos). Use (UInt32)(streamPos - pos) */ + UInt32 lenLimit; + + UInt32 cyclicBufferPos; + UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */ + + Byte streamEndWasReached; + Byte btMode; + Byte bigHash; + Byte directInput; + + UInt32 matchMaxLen; + CLzRef *hash; + CLzRef *son; + UInt32 hashMask; + UInt32 cutValue; + + Byte *bufBase; + ISeqInStreamPtr stream; + + UInt32 blockSize; + UInt32 keepSizeBefore; + UInt32 keepSizeAfter; + + UInt32 numHashBytes; + size_t directInputRem; + UInt32 historySize; + UInt32 fixedHashSize; + Byte numHashBytes_Min; + Byte numHashOutBits; + Byte _pad2_[2]; + SRes result; + UInt32 crc[256]; + size_t numRefs; + + UInt64 expectedDataSize; +} CMatchFinder; + +#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((const Byte *)(p)->buffer) + +#define Inline_MatchFinder_GetNumAvailableBytes(p) ((UInt32)((p)->streamPos - (p)->pos)) + +/* +#define Inline_MatchFinder_IsFinishedOK(p) \ + ((p)->streamEndWasReached \ + && (p)->streamPos == (p)->pos \ + && (!(p)->directInput || (p)->directInputRem == 0)) +*/ + +int MatchFinder_NeedMove(CMatchFinder *p); +/* Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p); */ +void MatchFinder_MoveBlock(CMatchFinder *p); +void MatchFinder_ReadIfRequired(CMatchFinder *p); + +void MatchFinder_Construct(CMatchFinder *p); + +/* (directInput = 0) is default value. + It's required to provide correct (directInput) value + before calling MatchFinder_Create(). + You can set (directInput) by any of the following calls: + - MatchFinder_SET_DIRECT_INPUT_BUF() + - MatchFinder_SET_STREAM() + - MatchFinder_SET_STREAM_MODE() +*/ + +#define MatchFinder_SET_DIRECT_INPUT_BUF(p, _src_, _srcLen_) { \ + (p)->stream = NULL; \ + (p)->directInput = 1; \ + (p)->buffer = (_src_); \ + (p)->directInputRem = (_srcLen_); } + +/* +#define MatchFinder_SET_STREAM_MODE(p) { \ + (p)->directInput = 0; } +*/ + +#define MatchFinder_SET_STREAM(p, _stream_) { \ + (p)->stream = _stream_; \ + (p)->directInput = 0; } + + +int MatchFinder_Create(CMatchFinder *p, UInt32 historySize, + UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter, + ISzAllocPtr alloc); +void MatchFinder_Free(CMatchFinder *p, ISzAllocPtr alloc); +void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems); + +/* +#define MatchFinder_INIT_POS(p, val) \ + (p)->pos = (val); \ + (p)->streamPos = (val); +*/ + +// void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue); +#define MatchFinder_REDUCE_OFFSETS(p, subValue) \ + (p)->pos -= (subValue); \ + (p)->streamPos -= (subValue); + + +UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son, + size_t _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue, + UInt32 *distances, UInt32 maxLen); + +/* +Conditions: + Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func. + Mf_GetPointerToCurrentPos_Func's result must be used only before any other function +*/ + +typedef void (*Mf_Init_Func)(void *object); +typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object); +typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object); +typedef UInt32 * (*Mf_GetMatches_Func)(void *object, UInt32 *distances); +typedef void (*Mf_Skip_Func)(void *object, UInt32); + +typedef struct +{ + Mf_Init_Func Init; + Mf_GetNumAvailableBytes_Func GetNumAvailableBytes; + Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos; + Mf_GetMatches_Func GetMatches; + Mf_Skip_Func Skip; +} IMatchFinder2; + +void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder2 *vTable); + +void MatchFinder_Init_LowHash(CMatchFinder *p); +void MatchFinder_Init_HighHash(CMatchFinder *p); +void MatchFinder_Init_4(CMatchFinder *p); +void MatchFinder_Init(CMatchFinder *p); + +UInt32* Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); +UInt32* Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); + +void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); +void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); + +void LzFindPrepare(void); + +EXTERN_C_END + +#endif |