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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 99 | pmbaty | 1 | /* LzFind.h -- Match finder for LZ algorithms |
| 2 | 2008-10-04 : Igor Pavlov : Public domain */ |
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| 3 | |||
| 4 | #ifndef __LZFIND_H |
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| 5 | #define __LZFIND_H |
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| 6 | |||
| 7 | #include "Types.h" |
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| 8 | |||
| 9 | typedef UInt32 CLzRef; |
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| 10 | |||
| 11 | typedef struct _CMatchFinder |
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| 12 | { |
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| 13 | Byte *buffer; |
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| 14 | UInt32 pos; |
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| 15 | UInt32 posLimit; |
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| 16 | UInt32 streamPos; |
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| 17 | UInt32 lenLimit; |
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| 18 | |||
| 19 | UInt32 cyclicBufferPos; |
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| 20 | UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */ |
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| 21 | |||
| 22 | UInt32 matchMaxLen; |
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| 23 | CLzRef *hash; |
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| 24 | CLzRef *son; |
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| 25 | UInt32 hashMask; |
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| 26 | UInt32 cutValue; |
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| 27 | |||
| 28 | Byte *bufferBase; |
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| 29 | ISeqInStream *stream; |
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| 30 | int streamEndWasReached; |
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| 31 | |||
| 32 | UInt32 blockSize; |
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| 33 | UInt32 keepSizeBefore; |
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| 34 | UInt32 keepSizeAfter; |
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| 35 | |||
| 36 | UInt32 numHashBytes; |
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| 37 | int directInput; |
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| 38 | int btMode; |
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| 39 | /* int skipModeBits; */ |
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| 40 | int bigHash; |
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| 41 | UInt32 historySize; |
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| 42 | UInt32 fixedHashSize; |
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| 43 | UInt32 hashSizeSum; |
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| 44 | UInt32 numSons; |
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| 45 | SRes result; |
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| 46 | UInt32 crc[256]; |
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| 47 | } CMatchFinder; |
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| 48 | |||
| 49 | #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer) |
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| 50 | #define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)]) |
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| 51 | |||
| 52 | #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos) |
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| 53 | |||
| 54 | int MatchFinder_NeedMove(CMatchFinder *p); |
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| 55 | Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p); |
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| 56 | void MatchFinder_MoveBlock(CMatchFinder *p); |
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| 57 | void MatchFinder_ReadIfRequired(CMatchFinder *p); |
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| 58 | |||
| 59 | void MatchFinder_Construct(CMatchFinder *p); |
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| 60 | |||
| 61 | /* Conditions: |
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| 62 | historySize <= 3 GB |
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| 63 | keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB |
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| 64 | */ |
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| 65 | int MatchFinder_Create(CMatchFinder *p, UInt32 historySize, |
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| 66 | UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter, |
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| 67 | ISzAlloc *alloc); |
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| 68 | void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc); |
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| 69 | void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems); |
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| 70 | void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue); |
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| 71 | |||
| 72 | UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son, |
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| 73 | UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue, |
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| 74 | UInt32 *distances, UInt32 maxLen); |
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| 75 | |||
| 76 | /* |
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| 77 | Conditions: |
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| 78 | Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func. |
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| 79 | Mf_GetPointerToCurrentPos_Func's result must be used only before any other function |
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| 80 | */ |
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| 81 | |||
| 82 | typedef void (*Mf_Init_Func)(void *object); |
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| 83 | typedef Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index); |
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| 84 | typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object); |
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| 85 | typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object); |
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| 86 | typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances); |
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| 87 | typedef void (*Mf_Skip_Func)(void *object, UInt32); |
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| 88 | |||
| 89 | typedef struct _IMatchFinder |
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| 90 | { |
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| 91 | Mf_Init_Func Init; |
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| 92 | Mf_GetIndexByte_Func GetIndexByte; |
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| 93 | Mf_GetNumAvailableBytes_Func GetNumAvailableBytes; |
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| 94 | Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos; |
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| 95 | Mf_GetMatches_Func GetMatches; |
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| 96 | Mf_Skip_Func Skip; |
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| 97 | } IMatchFinder; |
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| 98 | |||
| 99 | void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable); |
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| 100 | |||
| 101 | void MatchFinder_Init(CMatchFinder *p); |
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| 102 | UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); |
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| 103 | UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); |
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| 104 | void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); |
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| 105 | void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); |
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| 106 | |||
| 107 | #endif |