| 1 | /* LzFind.h -- Match finder for LZ algorithms |
| 2 | 2017-06-10 : Igor Pavlov : Public domain */ |
| 3 | |
| 4 | #ifndef __LZ_FIND_H |
| 5 | #define __LZ_FIND_H |
| 6 | |
| 7 | #include "7zTypes.h" |
| 8 | |
| 9 | EXTERN_C_BEGIN |
| 10 | |
| 11 | typedef UInt32 CLzRef; |
| 12 | |
| 13 | typedef struct _CMatchFinder |
| 14 | { |
| 15 | Byte *buffer; |
| 16 | UInt32 pos; |
| 17 | UInt32 posLimit; |
| 18 | UInt32 streamPos; |
| 19 | UInt32 lenLimit; |
| 20 | |
| 21 | UInt32 cyclicBufferPos; |
| 22 | UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */ |
| 23 | |
| 24 | Byte streamEndWasReached; |
| 25 | Byte btMode; |
| 26 | Byte bigHash; |
| 27 | Byte directInput; |
| 28 | |
| 29 | UInt32 matchMaxLen; |
| 30 | CLzRef *hash; |
| 31 | CLzRef *son; |
| 32 | UInt32 hashMask; |
| 33 | UInt32 cutValue; |
| 34 | |
| 35 | Byte *bufferBase; |
| 36 | ISeqInStream *stream; |
| 37 | |
| 38 | UInt32 blockSize; |
| 39 | UInt32 keepSizeBefore; |
| 40 | UInt32 keepSizeAfter; |
| 41 | |
| 42 | UInt32 numHashBytes; |
| 43 | size_t directInputRem; |
| 44 | UInt32 historySize; |
| 45 | UInt32 fixedHashSize; |
| 46 | UInt32 hashSizeSum; |
| 47 | SRes result; |
| 48 | UInt32 crc[256]; |
| 49 | size_t numRefs; |
| 50 | |
| 51 | UInt64 expectedDataSize; |
| 52 | } CMatchFinder; |
| 53 | |
| 54 | #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer) |
| 55 | |
| 56 | #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos) |
| 57 | |
| 58 | #define Inline_MatchFinder_IsFinishedOK(p) \ |
| 59 | ((p)->streamEndWasReached \ |
| 60 | && (p)->streamPos == (p)->pos \ |
| 61 | && (!(p)->directInput || (p)->directInputRem == 0)) |
| 62 | |
| 63 | int MatchFinder_NeedMove(CMatchFinder *p); |
| 64 | Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p); |
| 65 | void MatchFinder_MoveBlock(CMatchFinder *p); |
| 66 | void MatchFinder_ReadIfRequired(CMatchFinder *p); |
| 67 | |
| 68 | void MatchFinder_Construct(CMatchFinder *p); |
| 69 | |
| 70 | /* Conditions: |
| 71 | historySize <= 3 GB |
| 72 | keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB |
| 73 | */ |
| 74 | int MatchFinder_Create(CMatchFinder *p, UInt32 historySize, |
| 75 | UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter, |
| 76 | ISzAllocPtr alloc); |
| 77 | void MatchFinder_Free(CMatchFinder *p, ISzAllocPtr alloc); |
| 78 | void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems); |
| 79 | void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue); |
| 80 | |
| 81 | UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son, |
| 82 | UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue, |
| 83 | UInt32 *distances, UInt32 maxLen); |
| 84 | |
| 85 | /* |
| 86 | Conditions: |
| 87 | Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func. |
| 88 | Mf_GetPointerToCurrentPos_Func's result must be used only before any other function |
| 89 | */ |
| 90 | |
| 91 | typedef void (*Mf_Init_Func)(void *object); |
| 92 | typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object); |
| 93 | typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object); |
| 94 | typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances); |
| 95 | typedef void (*Mf_Skip_Func)(void *object, UInt32); |
| 96 | |
| 97 | typedef struct _IMatchFinder |
| 98 | { |
| 99 | Mf_Init_Func Init; |
| 100 | Mf_GetNumAvailableBytes_Func GetNumAvailableBytes; |
| 101 | Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos; |
| 102 | Mf_GetMatches_Func GetMatches; |
| 103 | Mf_Skip_Func Skip; |
| 104 | } IMatchFinder; |
| 105 | |
| 106 | void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable); |
| 107 | |
| 108 | void MatchFinder_Init_LowHash(CMatchFinder *p); |
| 109 | void MatchFinder_Init_HighHash(CMatchFinder *p); |
| 110 | void MatchFinder_Init_3(CMatchFinder *p, int readData); |
| 111 | void MatchFinder_Init(CMatchFinder *p); |
| 112 | |
| 113 | UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); |
| 114 | UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); |
| 115 | |
| 116 | void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); |
| 117 | void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); |
| 118 | |
| 119 | EXTERN_C_END |
| 120 | |
| 121 | #endif |