| 1 | /* LzFind.h -- Match finder for LZ algorithms\r |
| 2 | 2015-10-15 : Igor Pavlov : Public domain */\r |
| 3 | \r |
| 4 | #ifndef __LZ_FIND_H\r |
| 5 | #define __LZ_FIND_H\r |
| 6 | \r |
| 7 | #include "7zTypes.h"\r |
| 8 | \r |
| 9 | EXTERN_C_BEGIN\r |
| 10 | \r |
| 11 | typedef UInt32 CLzRef;\r |
| 12 | \r |
| 13 | typedef struct _CMatchFinder\r |
| 14 | {\r |
| 15 | Byte *buffer;\r |
| 16 | UInt32 pos;\r |
| 17 | UInt32 posLimit;\r |
| 18 | UInt32 streamPos;\r |
| 19 | UInt32 lenLimit;\r |
| 20 | \r |
| 21 | UInt32 cyclicBufferPos;\r |
| 22 | UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */\r |
| 23 | \r |
| 24 | Byte streamEndWasReached;\r |
| 25 | Byte btMode;\r |
| 26 | Byte bigHash;\r |
| 27 | Byte directInput;\r |
| 28 | \r |
| 29 | UInt32 matchMaxLen;\r |
| 30 | CLzRef *hash;\r |
| 31 | CLzRef *son;\r |
| 32 | UInt32 hashMask;\r |
| 33 | UInt32 cutValue;\r |
| 34 | \r |
| 35 | Byte *bufferBase;\r |
| 36 | ISeqInStream *stream;\r |
| 37 | \r |
| 38 | UInt32 blockSize;\r |
| 39 | UInt32 keepSizeBefore;\r |
| 40 | UInt32 keepSizeAfter;\r |
| 41 | \r |
| 42 | UInt32 numHashBytes;\r |
| 43 | size_t directInputRem;\r |
| 44 | UInt32 historySize;\r |
| 45 | UInt32 fixedHashSize;\r |
| 46 | UInt32 hashSizeSum;\r |
| 47 | SRes result;\r |
| 48 | UInt32 crc[256];\r |
| 49 | size_t numRefs;\r |
| 50 | } CMatchFinder;\r |
| 51 | \r |
| 52 | #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)\r |
| 53 | \r |
| 54 | #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)\r |
| 55 | \r |
| 56 | #define Inline_MatchFinder_IsFinishedOK(p) \\r |
| 57 | ((p)->streamEndWasReached \\r |
| 58 | && (p)->streamPos == (p)->pos \\r |
| 59 | && (!(p)->directInput || (p)->directInputRem == 0))\r |
| 60 | \r |
| 61 | int MatchFinder_NeedMove(CMatchFinder *p);\r |
| 62 | Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);\r |
| 63 | void MatchFinder_MoveBlock(CMatchFinder *p);\r |
| 64 | void MatchFinder_ReadIfRequired(CMatchFinder *p);\r |
| 65 | \r |
| 66 | void MatchFinder_Construct(CMatchFinder *p);\r |
| 67 | \r |
| 68 | /* Conditions:\r |
| 69 | historySize <= 3 GB\r |
| 70 | keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB\r |
| 71 | */\r |
| 72 | int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,\r |
| 73 | UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,\r |
| 74 | ISzAlloc *alloc);\r |
| 75 | void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc);\r |
| 76 | void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems);\r |
| 77 | void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);\r |
| 78 | \r |
| 79 | UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,\r |
| 80 | UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,\r |
| 81 | UInt32 *distances, UInt32 maxLen);\r |
| 82 | \r |
| 83 | /*\r |
| 84 | Conditions:\r |
| 85 | Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.\r |
| 86 | Mf_GetPointerToCurrentPos_Func's result must be used only before any other function\r |
| 87 | */\r |
| 88 | \r |
| 89 | typedef void (*Mf_Init_Func)(void *object);\r |
| 90 | typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);\r |
| 91 | typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);\r |
| 92 | typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);\r |
| 93 | typedef void (*Mf_Skip_Func)(void *object, UInt32);\r |
| 94 | \r |
| 95 | typedef struct _IMatchFinder\r |
| 96 | {\r |
| 97 | Mf_Init_Func Init;\r |
| 98 | Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;\r |
| 99 | Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;\r |
| 100 | Mf_GetMatches_Func GetMatches;\r |
| 101 | Mf_Skip_Func Skip;\r |
| 102 | } IMatchFinder;\r |
| 103 | \r |
| 104 | void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);\r |
| 105 | \r |
| 106 | void MatchFinder_Init_2(CMatchFinder *p, int readData);\r |
| 107 | void MatchFinder_Init(CMatchFinder *p);\r |
| 108 | \r |
| 109 | UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);\r |
| 110 | UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);\r |
| 111 | \r |
| 112 | void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);\r |
| 113 | void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);\r |
| 114 | \r |
| 115 | EXTERN_C_END\r |
| 116 | \r |
| 117 | #endif\r |