rlm@1: /* LzFind.h -- Match finder for LZ algorithms
rlm@1: 2008-10-04 : Igor Pavlov : Public domain */
rlm@1: 
rlm@1: #ifndef __LZFIND_H
rlm@1: #define __LZFIND_H
rlm@1: 
rlm@1: #include "Types.h"
rlm@1: 
rlm@1: typedef UInt32 CLzRef;
rlm@1: 
rlm@1: typedef struct _CMatchFinder
rlm@1: {
rlm@1:   Byte *buffer;
rlm@1:   UInt32 pos;
rlm@1:   UInt32 posLimit;
rlm@1:   UInt32 streamPos;
rlm@1:   UInt32 lenLimit;
rlm@1: 
rlm@1:   UInt32 cyclicBufferPos;
rlm@1:   UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */
rlm@1: 
rlm@1:   UInt32 matchMaxLen;
rlm@1:   CLzRef *hash;
rlm@1:   CLzRef *son;
rlm@1:   UInt32 hashMask;
rlm@1:   UInt32 cutValue;
rlm@1: 
rlm@1:   Byte *bufferBase;
rlm@1:   ISeqInStream *stream;
rlm@1:   int streamEndWasReached;
rlm@1: 
rlm@1:   UInt32 blockSize;
rlm@1:   UInt32 keepSizeBefore;
rlm@1:   UInt32 keepSizeAfter;
rlm@1: 
rlm@1:   UInt32 numHashBytes;
rlm@1:   int directInput;
rlm@1:   int btMode;
rlm@1:   /* int skipModeBits; */
rlm@1:   int bigHash;
rlm@1:   UInt32 historySize;
rlm@1:   UInt32 fixedHashSize;
rlm@1:   UInt32 hashSizeSum;
rlm@1:   UInt32 numSons;
rlm@1:   SRes result;
rlm@1:   UInt32 crc[256];
rlm@1: } CMatchFinder;
rlm@1: 
rlm@1: #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
rlm@1: #define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)])
rlm@1: 
rlm@1: #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
rlm@1: 
rlm@1: int MatchFinder_NeedMove(CMatchFinder *p);
rlm@1: Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);
rlm@1: void MatchFinder_MoveBlock(CMatchFinder *p);
rlm@1: void MatchFinder_ReadIfRequired(CMatchFinder *p);
rlm@1: 
rlm@1: void MatchFinder_Construct(CMatchFinder *p);
rlm@1: 
rlm@1: /* Conditions:
rlm@1:      historySize <= 3 GB
rlm@1:      keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
rlm@1: */
rlm@1: int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
rlm@1:     UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
rlm@1:     ISzAlloc *alloc);
rlm@1: void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc);
rlm@1: void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems);
rlm@1: void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
rlm@1: 
rlm@1: UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
rlm@1:     UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
rlm@1:     UInt32 *distances, UInt32 maxLen);
rlm@1: 
rlm@1: /*
rlm@1: Conditions:
rlm@1:   Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
rlm@1:   Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
rlm@1: */
rlm@1: 
rlm@1: typedef void (*Mf_Init_Func)(void *object);
rlm@1: typedef Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index);
rlm@1: typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
rlm@1: typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
rlm@1: typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
rlm@1: typedef void (*Mf_Skip_Func)(void *object, UInt32);
rlm@1: 
rlm@1: typedef struct _IMatchFinder
rlm@1: {
rlm@1:   Mf_Init_Func Init;
rlm@1:   Mf_GetIndexByte_Func GetIndexByte;
rlm@1:   Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
rlm@1:   Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
rlm@1:   Mf_GetMatches_Func GetMatches;
rlm@1:   Mf_Skip_Func Skip;
rlm@1: } IMatchFinder;
rlm@1: 
rlm@1: void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
rlm@1: 
rlm@1: void MatchFinder_Init(CMatchFinder *p);
rlm@1: UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
rlm@1: UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
rlm@1: void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
rlm@1: void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
rlm@1: 
rlm@1: #endif