bashi@chromium.org | c2a9375 | 2012-05-02 00:18:22 +0000 | [diff] [blame] | 1 | /* LzFind.h -- Match finder for LZ algorithms |
agl@chromium.org | 92ae161 | 2012-06-26 19:58:38 +0000 | [diff] [blame] | 2 | 2009-04-22 : Igor Pavlov : Public domain |
| 3 | in the public domain */ |
bashi@chromium.org | c2a9375 | 2012-05-02 00:18:22 +0000 | [diff] [blame] | 4 | |
| 5 | #ifndef __LZ_FIND_H |
| 6 | #define __LZ_FIND_H |
| 7 | |
| 8 | #include "Types.h" |
| 9 | |
| 10 | #ifdef __cplusplus |
| 11 | extern "C" { |
| 12 | #endif |
| 13 | |
| 14 | typedef UInt32 CLzRef; |
| 15 | |
| 16 | typedef struct _CMatchFinder |
| 17 | { |
| 18 | Byte *buffer; |
| 19 | UInt32 pos; |
| 20 | UInt32 posLimit; |
| 21 | UInt32 streamPos; |
| 22 | UInt32 lenLimit; |
| 23 | |
| 24 | UInt32 cyclicBufferPos; |
| 25 | UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */ |
| 26 | |
| 27 | UInt32 matchMaxLen; |
| 28 | CLzRef *hash; |
| 29 | CLzRef *son; |
| 30 | UInt32 hashMask; |
| 31 | UInt32 cutValue; |
| 32 | |
| 33 | Byte *bufferBase; |
| 34 | ISeqInStream *stream; |
| 35 | int streamEndWasReached; |
| 36 | |
| 37 | UInt32 blockSize; |
| 38 | UInt32 keepSizeBefore; |
| 39 | UInt32 keepSizeAfter; |
| 40 | |
| 41 | UInt32 numHashBytes; |
| 42 | int directInput; |
| 43 | size_t directInputRem; |
| 44 | int btMode; |
| 45 | int bigHash; |
| 46 | UInt32 historySize; |
| 47 | UInt32 fixedHashSize; |
| 48 | UInt32 hashSizeSum; |
| 49 | UInt32 numSons; |
| 50 | SRes result; |
| 51 | UInt32 crc[256]; |
| 52 | } CMatchFinder; |
| 53 | |
| 54 | #define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer) |
| 55 | #define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)]) |
| 56 | |
| 57 | #define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos) |
| 58 | |
| 59 | int MatchFinder_NeedMove(CMatchFinder *p); |
| 60 | Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p); |
| 61 | void MatchFinder_MoveBlock(CMatchFinder *p); |
| 62 | void MatchFinder_ReadIfRequired(CMatchFinder *p); |
| 63 | |
| 64 | void MatchFinder_Construct(CMatchFinder *p); |
| 65 | |
| 66 | /* Conditions: |
| 67 | historySize <= 3 GB |
| 68 | keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB |
| 69 | */ |
| 70 | int MatchFinder_Create(CMatchFinder *p, UInt32 historySize, |
| 71 | UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter, |
| 72 | ISzAlloc *alloc); |
| 73 | void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc); |
| 74 | void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems); |
| 75 | void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue); |
| 76 | |
| 77 | UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son, |
| 78 | UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue, |
| 79 | UInt32 *distances, UInt32 maxLen); |
| 80 | |
| 81 | /* |
| 82 | Conditions: |
| 83 | Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func. |
| 84 | Mf_GetPointerToCurrentPos_Func's result must be used only before any other function |
| 85 | */ |
| 86 | |
| 87 | typedef void (*Mf_Init_Func)(void *object); |
| 88 | typedef Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index); |
| 89 | typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object); |
| 90 | typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object); |
| 91 | typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances); |
| 92 | typedef void (*Mf_Skip_Func)(void *object, UInt32); |
| 93 | |
| 94 | typedef struct _IMatchFinder |
| 95 | { |
| 96 | Mf_Init_Func Init; |
| 97 | Mf_GetIndexByte_Func GetIndexByte; |
| 98 | Mf_GetNumAvailableBytes_Func GetNumAvailableBytes; |
| 99 | Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos; |
| 100 | Mf_GetMatches_Func GetMatches; |
| 101 | Mf_Skip_Func Skip; |
| 102 | } IMatchFinder; |
| 103 | |
| 104 | void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable); |
| 105 | |
| 106 | void MatchFinder_Init(CMatchFinder *p); |
| 107 | UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); |
| 108 | UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances); |
| 109 | void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); |
| 110 | void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num); |
| 111 | |
| 112 | #ifdef __cplusplus |
| 113 | } |
| 114 | #endif |
| 115 | |
| 116 | #endif |