summaryrefslogtreecommitdiffstats
path: root/C/Ppmd7.h
diff options
context:
space:
mode:
Diffstat (limited to 'C/Ppmd7.h')
-rwxr-xr-xC/Ppmd7.h140
1 files changed, 140 insertions, 0 deletions
diff --git a/C/Ppmd7.h b/C/Ppmd7.h
new file mode 100755
index 0000000..56e81eb
--- /dev/null
+++ b/C/Ppmd7.h
@@ -0,0 +1,140 @@
+/* Ppmd7.h -- PPMdH compression codec
+2010-03-12 : Igor Pavlov : Public domain
+This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */
+
+/* This code supports virtual RangeDecoder and includes the implementation
+of RangeCoder from 7z, instead of RangeCoder from original PPMd var.H.
+If you need the compatibility with original PPMd var.H, you can use external RangeDecoder */
+
+#ifndef __PPMD7_H
+#define __PPMD7_H
+
+#include "Ppmd.h"
+
+EXTERN_C_BEGIN
+
+#define PPMD7_MIN_ORDER 2
+#define PPMD7_MAX_ORDER 64
+
+#define PPMD7_MIN_MEM_SIZE (1 << 11)
+#define PPMD7_MAX_MEM_SIZE (0xFFFFFFFF - 12 * 3)
+
+struct CPpmd7_Context_;
+
+typedef
+ #ifdef PPMD_32BIT
+ struct CPpmd7_Context_ *
+ #else
+ UInt32
+ #endif
+ CPpmd7_Context_Ref;
+
+typedef struct CPpmd7_Context_
+{
+ UInt16 NumStats;
+ UInt16 SummFreq;
+ CPpmd_State_Ref Stats;
+ CPpmd7_Context_Ref Suffix;
+} CPpmd7_Context;
+
+#define Ppmd7Context_OneState(p) ((CPpmd_State *)&(p)->SummFreq)
+
+typedef struct
+{
+ CPpmd7_Context *MinContext, *MaxContext;
+ CPpmd_State *FoundState;
+ unsigned OrderFall, InitEsc, PrevSuccess, MaxOrder, HiBitsFlag;
+ Int32 RunLength, InitRL; /* must be 32-bit at least */
+
+ UInt32 Size;
+ UInt32 GlueCount;
+ Byte *Base, *LoUnit, *HiUnit, *Text, *UnitsStart;
+ UInt32 AlignOffset;
+
+ Byte Indx2Units[PPMD_NUM_INDEXES];
+ Byte Units2Indx[128];
+ CPpmd_Void_Ref FreeList[PPMD_NUM_INDEXES];
+ Byte NS2Indx[256], NS2BSIndx[256], HB2Flag[256];
+ CPpmd_See DummySee, See[25][16];
+ UInt16 BinSumm[128][64];
+} CPpmd7;
+
+void Ppmd7_Construct(CPpmd7 *p);
+Bool Ppmd7_Alloc(CPpmd7 *p, UInt32 size, ISzAlloc *alloc);
+void Ppmd7_Free(CPpmd7 *p, ISzAlloc *alloc);
+void Ppmd7_Init(CPpmd7 *p, unsigned maxOrder);
+#define Ppmd7_WasAllocated(p) ((p)->Base != NULL)
+
+
+/* ---------- Internal Functions ---------- */
+
+extern const Byte PPMD7_kExpEscape[16];
+
+#ifdef PPMD_32BIT
+ #define Ppmd7_GetPtr(p, ptr) (ptr)
+ #define Ppmd7_GetContext(p, ptr) (ptr)
+ #define Ppmd7_GetStats(p, ctx) ((ctx)->Stats)
+#else
+ #define Ppmd7_GetPtr(p, offs) ((void *)((p)->Base + (offs)))
+ #define Ppmd7_GetContext(p, offs) ((CPpmd7_Context *)Ppmd7_GetPtr((p), (offs)))
+ #define Ppmd7_GetStats(p, ctx) ((CPpmd_State *)Ppmd7_GetPtr((p), ((ctx)->Stats)))
+#endif
+
+void Ppmd7_Update1(CPpmd7 *p);
+void Ppmd7_Update1_0(CPpmd7 *p);
+void Ppmd7_Update2(CPpmd7 *p);
+void Ppmd7_UpdateBin(CPpmd7 *p);
+
+#define Ppmd7_GetBinSumm(p) \
+ &p->BinSumm[Ppmd7Context_OneState(p->MinContext)->Freq - 1][p->PrevSuccess + \
+ p->NS2BSIndx[Ppmd7_GetContext(p, p->MinContext->Suffix)->NumStats - 1] + \
+ (p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol]) + \
+ 2 * p->HB2Flag[Ppmd7Context_OneState(p->MinContext)->Symbol] + \
+ ((p->RunLength >> 26) & 0x20)]
+
+CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked, UInt32 *scale);
+
+
+/* ---------- Decode ---------- */
+
+typedef struct
+{
+ UInt32 (*GetThreshold)(void *p, UInt32 total);
+ void (*Decode)(void *p, UInt32 start, UInt32 size);
+ UInt32 (*DecodeBit)(void *p, UInt32 size0);
+} IPpmd7_RangeDec;
+
+typedef struct
+{
+ IPpmd7_RangeDec p;
+ UInt32 Range;
+ UInt32 Code;
+ IByteIn *Stream;
+} CPpmd7z_RangeDec;
+
+void Ppmd7z_RangeDec_CreateVTable(CPpmd7z_RangeDec *p);
+Bool Ppmd7z_RangeDec_Init(CPpmd7z_RangeDec *p);
+#define Ppmd7z_RangeDec_IsFinishedOK(p) ((p)->Code == 0)
+
+int Ppmd7_DecodeSymbol(CPpmd7 *p, IPpmd7_RangeDec *rc);
+
+
+/* ---------- Encode ---------- */
+
+typedef struct
+{
+ UInt64 Low;
+ UInt32 Range;
+ Byte Cache;
+ UInt64 CacheSize;
+ IByteOut *Stream;
+} CPpmd7z_RangeEnc;
+
+void Ppmd7z_RangeEnc_Init(CPpmd7z_RangeEnc *p);
+void Ppmd7z_RangeEnc_FlushData(CPpmd7z_RangeEnc *p);
+
+void Ppmd7_EncodeSymbol(CPpmd7 *p, CPpmd7z_RangeEnc *rc, int symbol);
+
+EXTERN_C_END
+
+#endif