| 1 | /* Ppmd7Enc.c -- PPMdH Encoder\r |
| 2 | 2015-09-28 : Igor Pavlov : Public domain\r |
| 3 | This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */\r |
| 4 | \r |
| 5 | #include "Precomp.h"\r |
| 6 | \r |
| 7 | #include "Ppmd7.h"\r |
| 8 | \r |
| 9 | #define kTopValue (1 << 24)\r |
| 10 | \r |
| 11 | void Ppmd7z_RangeEnc_Init(CPpmd7z_RangeEnc *p)\r |
| 12 | {\r |
| 13 | p->Low = 0;\r |
| 14 | p->Range = 0xFFFFFFFF;\r |
| 15 | p->Cache = 0;\r |
| 16 | p->CacheSize = 1;\r |
| 17 | }\r |
| 18 | \r |
| 19 | static void RangeEnc_ShiftLow(CPpmd7z_RangeEnc *p)\r |
| 20 | {\r |
| 21 | if ((UInt32)p->Low < (UInt32)0xFF000000 || (unsigned)(p->Low >> 32) != 0)\r |
| 22 | {\r |
| 23 | Byte temp = p->Cache;\r |
| 24 | do\r |
| 25 | {\r |
| 26 | p->Stream->Write(p->Stream, (Byte)(temp + (Byte)(p->Low >> 32)));\r |
| 27 | temp = 0xFF;\r |
| 28 | }\r |
| 29 | while (--p->CacheSize != 0);\r |
| 30 | p->Cache = (Byte)((UInt32)p->Low >> 24);\r |
| 31 | }\r |
| 32 | p->CacheSize++;\r |
| 33 | p->Low = (UInt32)p->Low << 8;\r |
| 34 | }\r |
| 35 | \r |
| 36 | static void RangeEnc_Encode(CPpmd7z_RangeEnc *p, UInt32 start, UInt32 size, UInt32 total)\r |
| 37 | {\r |
| 38 | p->Low += start * (p->Range /= total);\r |
| 39 | p->Range *= size;\r |
| 40 | while (p->Range < kTopValue)\r |
| 41 | {\r |
| 42 | p->Range <<= 8;\r |
| 43 | RangeEnc_ShiftLow(p);\r |
| 44 | }\r |
| 45 | }\r |
| 46 | \r |
| 47 | static void RangeEnc_EncodeBit_0(CPpmd7z_RangeEnc *p, UInt32 size0)\r |
| 48 | {\r |
| 49 | p->Range = (p->Range >> 14) * size0;\r |
| 50 | while (p->Range < kTopValue)\r |
| 51 | {\r |
| 52 | p->Range <<= 8;\r |
| 53 | RangeEnc_ShiftLow(p);\r |
| 54 | }\r |
| 55 | }\r |
| 56 | \r |
| 57 | static void RangeEnc_EncodeBit_1(CPpmd7z_RangeEnc *p, UInt32 size0)\r |
| 58 | {\r |
| 59 | UInt32 newBound = (p->Range >> 14) * size0;\r |
| 60 | p->Low += newBound;\r |
| 61 | p->Range -= newBound;\r |
| 62 | while (p->Range < kTopValue)\r |
| 63 | {\r |
| 64 | p->Range <<= 8;\r |
| 65 | RangeEnc_ShiftLow(p);\r |
| 66 | }\r |
| 67 | }\r |
| 68 | \r |
| 69 | void Ppmd7z_RangeEnc_FlushData(CPpmd7z_RangeEnc *p)\r |
| 70 | {\r |
| 71 | unsigned i;\r |
| 72 | for (i = 0; i < 5; i++)\r |
| 73 | RangeEnc_ShiftLow(p);\r |
| 74 | }\r |
| 75 | \r |
| 76 | \r |
| 77 | #define MASK(sym) ((signed char *)charMask)[sym]\r |
| 78 | \r |
| 79 | void Ppmd7_EncodeSymbol(CPpmd7 *p, CPpmd7z_RangeEnc *rc, int symbol)\r |
| 80 | {\r |
| 81 | size_t charMask[256 / sizeof(size_t)];\r |
| 82 | if (p->MinContext->NumStats != 1)\r |
| 83 | {\r |
| 84 | CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);\r |
| 85 | UInt32 sum;\r |
| 86 | unsigned i;\r |
| 87 | if (s->Symbol == symbol)\r |
| 88 | {\r |
| 89 | RangeEnc_Encode(rc, 0, s->Freq, p->MinContext->SummFreq);\r |
| 90 | p->FoundState = s;\r |
| 91 | Ppmd7_Update1_0(p);\r |
| 92 | return;\r |
| 93 | }\r |
| 94 | p->PrevSuccess = 0;\r |
| 95 | sum = s->Freq;\r |
| 96 | i = p->MinContext->NumStats - 1;\r |
| 97 | do\r |
| 98 | {\r |
| 99 | if ((++s)->Symbol == symbol)\r |
| 100 | {\r |
| 101 | RangeEnc_Encode(rc, sum, s->Freq, p->MinContext->SummFreq);\r |
| 102 | p->FoundState = s;\r |
| 103 | Ppmd7_Update1(p);\r |
| 104 | return;\r |
| 105 | }\r |
| 106 | sum += s->Freq;\r |
| 107 | }\r |
| 108 | while (--i);\r |
| 109 | \r |
| 110 | p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol];\r |
| 111 | PPMD_SetAllBitsIn256Bytes(charMask);\r |
| 112 | MASK(s->Symbol) = 0;\r |
| 113 | i = p->MinContext->NumStats - 1;\r |
| 114 | do { MASK((--s)->Symbol) = 0; } while (--i);\r |
| 115 | RangeEnc_Encode(rc, sum, p->MinContext->SummFreq - sum, p->MinContext->SummFreq);\r |
| 116 | }\r |
| 117 | else\r |
| 118 | {\r |
| 119 | UInt16 *prob = Ppmd7_GetBinSumm(p);\r |
| 120 | CPpmd_State *s = Ppmd7Context_OneState(p->MinContext);\r |
| 121 | if (s->Symbol == symbol)\r |
| 122 | {\r |
| 123 | RangeEnc_EncodeBit_0(rc, *prob);\r |
| 124 | *prob = (UInt16)PPMD_UPDATE_PROB_0(*prob);\r |
| 125 | p->FoundState = s;\r |
| 126 | Ppmd7_UpdateBin(p);\r |
| 127 | return;\r |
| 128 | }\r |
| 129 | else\r |
| 130 | {\r |
| 131 | RangeEnc_EncodeBit_1(rc, *prob);\r |
| 132 | *prob = (UInt16)PPMD_UPDATE_PROB_1(*prob);\r |
| 133 | p->InitEsc = PPMD7_kExpEscape[*prob >> 10];\r |
| 134 | PPMD_SetAllBitsIn256Bytes(charMask);\r |
| 135 | MASK(s->Symbol) = 0;\r |
| 136 | p->PrevSuccess = 0;\r |
| 137 | }\r |
| 138 | }\r |
| 139 | for (;;)\r |
| 140 | {\r |
| 141 | UInt32 escFreq;\r |
| 142 | CPpmd_See *see;\r |
| 143 | CPpmd_State *s;\r |
| 144 | UInt32 sum;\r |
| 145 | unsigned i, numMasked = p->MinContext->NumStats;\r |
| 146 | do\r |
| 147 | {\r |
| 148 | p->OrderFall++;\r |
| 149 | if (!p->MinContext->Suffix)\r |
| 150 | return; /* EndMarker (symbol = -1) */\r |
| 151 | p->MinContext = Ppmd7_GetContext(p, p->MinContext->Suffix);\r |
| 152 | }\r |
| 153 | while (p->MinContext->NumStats == numMasked);\r |
| 154 | \r |
| 155 | see = Ppmd7_MakeEscFreq(p, numMasked, &escFreq);\r |
| 156 | s = Ppmd7_GetStats(p, p->MinContext);\r |
| 157 | sum = 0;\r |
| 158 | i = p->MinContext->NumStats;\r |
| 159 | do\r |
| 160 | {\r |
| 161 | int cur = s->Symbol;\r |
| 162 | if (cur == symbol)\r |
| 163 | {\r |
| 164 | UInt32 low = sum;\r |
| 165 | CPpmd_State *s1 = s;\r |
| 166 | do\r |
| 167 | {\r |
| 168 | sum += (s->Freq & (int)(MASK(s->Symbol)));\r |
| 169 | s++;\r |
| 170 | }\r |
| 171 | while (--i);\r |
| 172 | RangeEnc_Encode(rc, low, s1->Freq, sum + escFreq);\r |
| 173 | Ppmd_See_Update(see);\r |
| 174 | p->FoundState = s1;\r |
| 175 | Ppmd7_Update2(p);\r |
| 176 | return;\r |
| 177 | }\r |
| 178 | sum += (s->Freq & (int)(MASK(cur)));\r |
| 179 | MASK(cur) = 0;\r |
| 180 | s++;\r |
| 181 | }\r |
| 182 | while (--i);\r |
| 183 | \r |
| 184 | RangeEnc_Encode(rc, sum, escFreq, sum + escFreq);\r |
| 185 | see->Summ = (UInt16)(see->Summ + sum + escFreq);\r |
| 186 | }\r |
| 187 | }\r |