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Diffstat (limited to 'src/lib/lib7z/Ppmd8.h')
-rw-r--r-- | src/lib/lib7z/Ppmd8.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/lib/lib7z/Ppmd8.h b/src/lib/lib7z/Ppmd8.h new file mode 100644 index 00000000000..7dcfc91613b --- /dev/null +++ b/src/lib/lib7z/Ppmd8.h @@ -0,0 +1,137 @@ +/* Ppmd8.h -- PPMdI codec +2011-01-27 : Igor Pavlov : Public domain +This code is based on: + PPMd var.I (2002): Dmitry Shkarin : Public domain + Carryless rangecoder (1999): Dmitry Subbotin : Public domain */ + +#ifndef __PPMD8_H +#define __PPMD8_H + +#include "Ppmd.h" + +EXTERN_C_BEGIN + +#define PPMD8_MIN_ORDER 2 +#define PPMD8_MAX_ORDER 16 + +struct CPpmd8_Context_; + +typedef + #ifdef PPMD_32BIT + struct CPpmd8_Context_ * + #else + UInt32 + #endif + CPpmd8_Context_Ref; + +#pragma pack(push, 1) + +typedef struct CPpmd8_Context_ +{ + Byte NumStats; + Byte Flags; + UInt16 SummFreq; + CPpmd_State_Ref Stats; + CPpmd8_Context_Ref Suffix; +} CPpmd8_Context; + +#pragma pack(pop) + +#define Ppmd8Context_OneState(p) ((CPpmd_State *)&(p)->SummFreq) + +/* The BUG in Shkarin's code for FREEZE mode was fixed, but that fixed + code is not compatible with original code for some files compressed + in FREEZE mode. So we disable FREEZE mode support. */ + +enum +{ + PPMD8_RESTORE_METHOD_RESTART, + PPMD8_RESTORE_METHOD_CUT_OFF + #ifdef PPMD8_FREEZE_SUPPORT + , PPMD8_RESTORE_METHOD_FREEZE + #endif +}; + +typedef struct +{ + CPpmd8_Context *MinContext, *MaxContext; + CPpmd_State *FoundState; + unsigned OrderFall, InitEsc, PrevSuccess, MaxOrder; + Int32 RunLength, InitRL; /* must be 32-bit at least */ + + UInt32 Size; + UInt32 GlueCount; + Byte *Base, *LoUnit, *HiUnit, *Text, *UnitsStart; + UInt32 AlignOffset; + unsigned RestoreMethod; + + /* Range Coder */ + UInt32 Range; + UInt32 Code; + UInt32 Low; + union + { + IByteIn *In; + IByteOut *Out; + } Stream; + + Byte Indx2Units[PPMD_NUM_INDEXES]; + Byte Units2Indx[128]; + CPpmd_Void_Ref FreeList[PPMD_NUM_INDEXES]; + UInt32 Stamps[PPMD_NUM_INDEXES]; + + Byte NS2BSIndx[256], NS2Indx[260]; + CPpmd_See DummySee, See[24][32]; + UInt16 BinSumm[25][64]; +} CPpmd8; + +void Ppmd8_Construct(CPpmd8 *p); +Bool Ppmd8_Alloc(CPpmd8 *p, UInt32 size, ISzAlloc *alloc); +void Ppmd8_Free(CPpmd8 *p, ISzAlloc *alloc); +void Ppmd8_Init(CPpmd8 *p, unsigned maxOrder, unsigned restoreMethod); +#define Ppmd8_WasAllocated(p) ((p)->Base != NULL) + + +/* ---------- Internal Functions ---------- */ + +extern const Byte PPMD8_kExpEscape[16]; + +#ifdef PPMD_32BIT + #define Ppmd8_GetPtr(p, ptr) (ptr) + #define Ppmd8_GetContext(p, ptr) (ptr) + #define Ppmd8_GetStats(p, ctx) ((ctx)->Stats) +#else + #define Ppmd8_GetPtr(p, offs) ((void *)((p)->Base + (offs))) + #define Ppmd8_GetContext(p, offs) ((CPpmd8_Context *)Ppmd8_GetPtr((p), (offs))) + #define Ppmd8_GetStats(p, ctx) ((CPpmd_State *)Ppmd8_GetPtr((p), ((ctx)->Stats))) +#endif + +void Ppmd8_Update1(CPpmd8 *p); +void Ppmd8_Update1_0(CPpmd8 *p); +void Ppmd8_Update2(CPpmd8 *p); +void Ppmd8_UpdateBin(CPpmd8 *p); + +#define Ppmd8_GetBinSumm(p) \ + &p->BinSumm[p->NS2Indx[Ppmd8Context_OneState(p->MinContext)->Freq - 1]][ \ + p->NS2BSIndx[Ppmd8_GetContext(p, p->MinContext->Suffix)->NumStats] + \ + p->PrevSuccess + p->MinContext->Flags + ((p->RunLength >> 26) & 0x20)] + +CPpmd_See *Ppmd8_MakeEscFreq(CPpmd8 *p, unsigned numMasked, UInt32 *scale); + + +/* ---------- Decode ---------- */ + +Bool Ppmd8_RangeDec_Init(CPpmd8 *p); +#define Ppmd8_RangeDec_IsFinishedOK(p) ((p)->Code == 0) +int Ppmd8_DecodeSymbol(CPpmd8 *p); /* returns: -1 as EndMarker, -2 as DataError */ + + +/* ---------- Encode ---------- */ + +#define Ppmd8_RangeEnc_Init(p) { (p)->Low = 0; (p)->Range = 0xFFFFFFFF; } +void Ppmd8_RangeEnc_FlushData(CPpmd8 *p); +void Ppmd8_EncodeSymbol(CPpmd8 *p, int symbol); /* symbol = -1 means EndMarker */ + +EXTERN_C_END + +#endif |