repo sync | baa3858 | 2013-07-26 17:53:31 -0700 | [diff] [blame^] | 1 | /* Ppmd7.h -- PPMdH compression codec
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| 2 | 2010-03-12 : Igor Pavlov : Public domain
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| 3 | This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */
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| 4 |
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| 5 | /* This code supports virtual RangeDecoder and includes the implementation
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| 6 | of RangeCoder from 7z, instead of RangeCoder from original PPMd var.H.
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| 7 | If you need the compatibility with original PPMd var.H, you can use external RangeDecoder */
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| 8 |
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| 9 | #ifndef __PPMD7_H
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| 10 | #define __PPMD7_H
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| 11 |
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| 12 | #include "Ppmd.h"
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| 13 |
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| 14 | EXTERN_C_BEGIN
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| 15 |
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| 16 | #define PPMD7_MIN_ORDER 2
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| 17 | #define PPMD7_MAX_ORDER 64
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| 18 |
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| 19 | #define PPMD7_MIN_MEM_SIZE (1 << 11)
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| 20 | #define PPMD7_MAX_MEM_SIZE (0xFFFFFFFF - 12 * 3)
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| 21 |
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| 22 | struct CPpmd7_Context_;
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| 23 |
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| 24 | typedef
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| 25 | #ifdef PPMD_32BIT
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| 26 | struct CPpmd7_Context_ *
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| 27 | #else
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| 28 | UInt32
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| 29 | #endif
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| 30 | CPpmd7_Context_Ref;
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| 31 |
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| 32 | typedef struct CPpmd7_Context_
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| 33 | {
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| 34 | UInt16 NumStats;
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| 35 | UInt16 SummFreq;
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| 36 | CPpmd_State_Ref Stats;
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| 37 | CPpmd7_Context_Ref Suffix;
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| 38 | } CPpmd7_Context;
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| 39 |
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| 40 | #define Ppmd7Context_OneState(p) ((CPpmd_State *)&(p)->SummFreq)
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| 41 |
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| 42 | typedef struct
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| 43 | {
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| 44 | CPpmd7_Context *MinContext, *MaxContext;
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| 45 | CPpmd_State *FoundState;
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| 46 | unsigned OrderFall, InitEsc, PrevSuccess, MaxOrder, HiBitsFlag;
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| 47 | Int32 RunLength, InitRL; /* must be 32-bit at least */
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| 48 |
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| 49 | UInt32 Size;
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| 50 | UInt32 GlueCount;
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| 51 | Byte *Base, *LoUnit, *HiUnit, *Text, *UnitsStart;
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| 52 | UInt32 AlignOffset;
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| 53 |
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| 54 | Byte Indx2Units[PPMD_NUM_INDEXES];
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| 55 | Byte Units2Indx[128];
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| 56 | CPpmd_Void_Ref FreeList[PPMD_NUM_INDEXES];
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| 57 | Byte NS2Indx[256], NS2BSIndx[256], HB2Flag[256];
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| 58 | CPpmd_See DummySee, See[25][16];
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| 59 | UInt16 BinSumm[128][64];
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| 60 | } CPpmd7;
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| 61 |
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| 62 | void Ppmd7_Construct(CPpmd7 *p);
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| 63 | Bool Ppmd7_Alloc(CPpmd7 *p, UInt32 size, ISzAlloc *alloc);
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| 64 | void Ppmd7_Free(CPpmd7 *p, ISzAlloc *alloc);
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| 65 | void Ppmd7_Init(CPpmd7 *p, unsigned maxOrder);
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| 66 | #define Ppmd7_WasAllocated(p) ((p)->Base != NULL)
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| 67 |
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| 68 |
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| 69 | /* ---------- Internal Functions ---------- */
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| 70 |
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| 71 | extern const Byte PPMD7_kExpEscape[16];
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| 72 |
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| 73 | #ifdef PPMD_32BIT
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| 74 | #define Ppmd7_GetPtr(p, ptr) (ptr)
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| 75 | #define Ppmd7_GetContext(p, ptr) (ptr)
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| 76 | #define Ppmd7_GetStats(p, ctx) ((ctx)->Stats)
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| 77 | #else
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| 78 | #define Ppmd7_GetPtr(p, offs) ((void *)((p)->Base + (offs)))
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| 79 | #define Ppmd7_GetContext(p, offs) ((CPpmd7_Context *)Ppmd7_GetPtr((p), (offs)))
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| 80 | #define Ppmd7_GetStats(p, ctx) ((CPpmd_State *)Ppmd7_GetPtr((p), ((ctx)->Stats)))
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| 81 | #endif
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| 82 |
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| 83 | void Ppmd7_Update1(CPpmd7 *p);
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| 84 | void Ppmd7_Update1_0(CPpmd7 *p);
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| 85 | void Ppmd7_Update2(CPpmd7 *p);
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| 86 | void Ppmd7_UpdateBin(CPpmd7 *p);
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| 87 |
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| 88 | #define Ppmd7_GetBinSumm(p) \
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| 89 | &p->BinSumm[Ppmd7Context_OneState(p->MinContext)->Freq - 1][p->PrevSuccess + \
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| 90 | p->NS2BSIndx[Ppmd7_GetContext(p, p->MinContext->Suffix)->NumStats - 1] + \
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| 91 | (p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol]) + \
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| 92 | 2 * p->HB2Flag[Ppmd7Context_OneState(p->MinContext)->Symbol] + \
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| 93 | ((p->RunLength >> 26) & 0x20)]
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| 94 |
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| 95 | CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked, UInt32 *scale);
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| 96 |
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| 97 |
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| 98 | /* ---------- Decode ---------- */
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| 99 |
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| 100 | typedef struct
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| 101 | {
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| 102 | UInt32 (*GetThreshold)(void *p, UInt32 total);
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| 103 | void (*Decode)(void *p, UInt32 start, UInt32 size);
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| 104 | UInt32 (*DecodeBit)(void *p, UInt32 size0);
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| 105 | } IPpmd7_RangeDec;
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| 106 |
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| 107 | typedef struct
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| 108 | {
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| 109 | IPpmd7_RangeDec p;
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| 110 | UInt32 Range;
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| 111 | UInt32 Code;
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| 112 | IByteIn *Stream;
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| 113 | } CPpmd7z_RangeDec;
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| 114 |
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| 115 | void Ppmd7z_RangeDec_CreateVTable(CPpmd7z_RangeDec *p);
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| 116 | Bool Ppmd7z_RangeDec_Init(CPpmd7z_RangeDec *p);
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| 117 | #define Ppmd7z_RangeDec_IsFinishedOK(p) ((p)->Code == 0)
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| 118 |
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| 119 | int Ppmd7_DecodeSymbol(CPpmd7 *p, IPpmd7_RangeDec *rc);
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| 120 |
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| 121 |
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| 122 | /* ---------- Encode ---------- */
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| 123 |
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| 124 | typedef struct
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| 125 | {
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| 126 | UInt64 Low;
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| 127 | UInt32 Range;
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| 128 | Byte Cache;
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| 129 | UInt64 CacheSize;
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| 130 | IByteOut *Stream;
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| 131 | } CPpmd7z_RangeEnc;
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| 132 |
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| 133 | void Ppmd7z_RangeEnc_Init(CPpmd7z_RangeEnc *p);
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| 134 | void Ppmd7z_RangeEnc_FlushData(CPpmd7z_RangeEnc *p);
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| 135 |
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| 136 | void Ppmd7_EncodeSymbol(CPpmd7 *p, CPpmd7z_RangeEnc *rc, int symbol);
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| 137 |
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| 138 | EXTERN_C_END
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| 139 |
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| 140 | #endif
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