// File: lzham_symbol_codec.cpp // LZHAM is in the Public Domain. Please see the Public Domain declaration at the end of include/lzham.h #include "lzham_core.h" #include "lzham_symbol_codec.h" #include "lzham_huffman_codes.h" // Was 16 in previous versions. #define LZHAM_DEFAULT_MAX_UPDATE_INTERVAL 64 // Was 40 in previous versions // Keep in sync with default setting in g_table_update_settings[] #define LZHAM_DEFAULT_ADAPT_RATE 64U namespace lzham { // Using a fixed table to convert from scaled probability to scaled bits for determinism across compilers/run-time libs/platforms. uint32 g_prob_cost[cSymbolCodecArithProbScale] = { 0x0,0xB000000,0xA000000,0x96A3FE6,0x9000000,0x8AD961F,0x86A3FE6,0x8315130,0x8000000,0x7D47FCC,0x7AD961F, 0x78A62B0,0x76A3FE6,0x74CAFFC,0x7315130,0x717D605,0x7000000,0x6E99C09,0x6D47FCC,0x6C087D3,0x6AD961F,0x69B9116, 0x68A62B0,0x679F7D8,0x66A3FE6,0x65B2C3E,0x64CAFFC,0x63EBFB1,0x6315130,0x6245B5C,0x617D605,0x60BB9CA,0x6000000, 0x5F4A296,0x5E99C09,0x5DEE74F,0x5D47FCC,0x5CA6144,0x5C087D3,0x5B6EFE1,0x5AD961F,0x5A47779,0x59B9116,0x592E050, 0x58A62B0,0x58215EA,0x579F7D8,0x5720677,0x56A3FE6,0x562A260,0x55B2C3E,0x553DBEF,0x54CAFFC,0x545A701,0x53EBFB1, 0x537F8CF,0x5315130,0x52AC7B8,0x5245B5C,0x51E0B1B,0x517D605,0x511BB33,0x50BB9CA,0x505D0FC,0x5000000,0x4FA461A, 0x4F4A296,0x4EF14C7,0x4E99C09,0x4E437BE,0x4DEE74F,0x4D9AA2C,0x4D47FCC,0x4CF67A8,0x4CA6144,0x4C56C23,0x4C087D3, 0x4BBB3E1,0x4B6EFE1,0x4B23B6D,0x4AD961F,0x4A8FF97,0x4A47779,0x49FFD6A,0x49B9116,0x4973228,0x492E050,0x48E9B41, 0x48A62B0,0x4863655,0x48215EA,0x47E012C,0x479F7D8,0x475F9B0,0x4720677,0x46E1DF1,0x46A3FE6,0x4666C1D,0x462A260, 0x45EE27C,0x45B2C3E,0x4577F74,0x453DBEF,0x4504180,0x44CAFFC,0x4492735,0x445A701,0x4422F38,0x43EBFB1,0x43B5846, 0x437F8CF,0x434A129,0x4315130,0x42E08C0,0x42AC7B8,0x4278DF7,0x4245B5C,0x4212FC7,0x41E0B1B,0x41AED39,0x417D605, 0x414C561,0x411BB33,0x40EB75F,0x40BB9CA,0x408C25C,0x405D0FC,0x402E58F,0x4000000,0x3FD2036,0x3FA461A,0x3F77197, 0x3F4A296,0x3F1D903,0x3EF14C7,0x3EC55D0,0x3E99C09,0x3E6E75F,0x3E437BE,0x3E18D14,0x3DEE74F,0x3DC465D,0x3D9AA2C, 0x3D712AC,0x3D47FCC,0x3D1F17A,0x3CF67A8,0x3CCE246,0x3CA6144,0x3C7E492,0x3C56C23,0x3C2F7E8,0x3C087D3,0x3BE1BD5, 0x3BBB3E1,0x3B94FE9,0x3B6EFE1,0x3B493BC,0x3B23B6D,0x3AFE6E7,0x3AD961F,0x3AB4908,0x3A8FF97,0x3A6B9C0,0x3A47779, 0x3A238B5,0x39FFD6A,0x39DC58E,0x39B9116,0x3995FF7,0x3973228,0x395079E,0x392E050,0x390BC34,0x38E9B41,0x38C7D6E, 0x38A62B0,0x3884B01,0x3863655,0x38424A6,0x38215EA,0x3800A1A,0x37E012C,0x37BFB18,0x379F7D8,0x377F762,0x375F9B0, 0x373FEBA,0x3720677,0x37010E1,0x36E1DF1,0x36C2DA0,0x36A3FE6,0x36854BC,0x3666C1D,0x3648600,0x362A260,0x360C136, 0x35EE27C,0x35D062B,0x35B2C3E,0x35954AD,0x3577F74,0x355AC8C,0x353DBEF,0x3520D98,0x3504180,0x34E77A4,0x34CAFFC, 0x34AEA83,0x3492735,0x347660B,0x345A701,0x343EA12,0x3422F38,0x340766F,0x33EBFB1,0x33D0AFA,0x33B5846,0x339A78E, 0x337F8CF,0x3364C05,0x334A129,0x332F839,0x3315130,0x32FAC09,0x32E08C0,0x32C6751,0x32AC7B8,0x32929F1,0x3278DF7, 0x325F3C6,0x3245B5C,0x322C4B2,0x3212FC7,0x31F9C96,0x31E0B1B,0x31C7B53,0x31AED39,0x31960CB,0x317D605,0x3164CE2, 0x314C561,0x3133F7D,0x311BB33,0x310387F,0x30EB75F,0x30D37CE,0x30BB9CA,0x30A3D50,0x308C25C,0x30748EC,0x305D0FC, 0x3045A88,0x302E58F,0x301720E,0x3000000,0x2FE8F64,0x2FD2036,0x2FBB274,0x2FA461A,0x2F8DB27,0x2F77197,0x2F60968, 0x2F4A296,0x2F33D20,0x2F1D903,0x2F0763B,0x2EF14C7,0x2EDB4A5,0x2EC55D0,0x2EAF848,0x2E99C09,0x2E84111,0x2E6E75F, 0x2E58EEE,0x2E437BE,0x2E2E1CB,0x2E18D14,0x2E03996,0x2DEE74F,0x2DD963D,0x2DC465D,0x2DAF7AD,0x2D9AA2C,0x2D85DD7, 0x2D712AC,0x2D5C8A9,0x2D47FCC,0x2D33812,0x2D1F17A,0x2D0AC02,0x2CF67A8,0x2CE246A,0x2CCE246,0x2CBA13A,0x2CA6144, 0x2C92262,0x2C7E492,0x2C6A7D4,0x2C56C23,0x2C43180,0x2C2F7E8,0x2C1BF5A,0x2C087D3,0x2BF5151,0x2BE1BD5,0x2BCE75A, 0x2BBB3E1,0x2BA8166,0x2B94FE9,0x2B81F68,0x2B6EFE1,0x2B5C153,0x2B493BC,0x2B3671A,0x2B23B6D,0x2B110B1,0x2AFE6E7, 0x2AEBE0C,0x2AD961F,0x2AC6F1E,0x2AB4908,0x2AA23DC,0x2A8FF97,0x2A7DC39,0x2A6B9C0,0x2A5982B,0x2A47779,0x2A357A7, 0x2A238B5,0x2A11AA1,0x29FFD6A,0x29EE10F,0x29DC58E,0x29CAAE6,0x29B9116,0x29A781C,0x2995FF7,0x29848A6,0x2973228, 0x2961C7B,0x295079E,0x293F390,0x292E050,0x291CDDD,0x290BC34,0x28FAB56,0x28E9B41,0x28D8BF4,0x28C7D6E,0x28B6FAD, 0x28A62B0,0x2895677,0x2884B01,0x287404B,0x2863655,0x2852D1F,0x28424A6,0x2831CEA,0x28215EA,0x2810FA5,0x2800A1A, 0x27F0547,0x27E012C,0x27CFDC7,0x27BFB18,0x27AF91E,0x279F7D8,0x278F744,0x277F762,0x276F831,0x275F9B0,0x274FBDE, 0x273FEBA,0x2730242,0x2720677,0x2710B57,0x27010E1,0x26F1715,0x26E1DF1,0x26D2575,0x26C2DA0,0x26B3670,0x26A3FE6, 0x26949FF,0x26854BC,0x267601C,0x2666C1D,0x26578BE,0x2648600,0x26393E1,0x262A260,0x261B17D,0x260C136,0x25FD18C, 0x25EE27C,0x25DF407,0x25D062B,0x25C18E8,0x25B2C3E,0x25A402A,0x25954AD,0x25869C6,0x2577F74,0x25695B6,0x255AC8C, 0x254C3F4,0x253DBEF,0x252F47B,0x2520D98,0x2512744,0x2504180,0x24F5C4B,0x24E77A4,0x24D9389,0x24CAFFC,0x24BCCFA, 0x24AEA83,0x24A0897,0x2492735,0x248465C,0x247660B,0x2468643,0x245A701,0x244C847,0x243EA12,0x2430C63,0x2422F38, 0x2415292,0x240766F,0x23F9ACF,0x23EBFB1,0x23DE515,0x23D0AFA,0x23C3160,0x23B5846,0x23A7FAB,0x239A78E,0x238CFF0, 0x237F8CF,0x237222C,0x2364C05,0x2357659,0x234A129,0x233CC74,0x232F839,0x2322478,0x2315130,0x2307E61,0x22FAC09, 0x22EDA29,0x22E08C0,0x22D37CE,0x22C6751,0x22B974A,0x22AC7B8,0x229F89B,0x22929F1,0x2285BBA,0x2278DF7,0x226C0A6, 0x225F3C6,0x2252758,0x2245B5C,0x2238FCF,0x222C4B2,0x221FA05,0x2212FC7,0x22065F7,0x21F9C96,0x21ED3A2,0x21E0B1B, 0x21D4301,0x21C7B53,0x21BB410,0x21AED39,0x21A26CD,0x21960CB,0x2189B33,0x217D605,0x217113F,0x2164CE2,0x21588EE, 0x214C561,0x214023B,0x2133F7D,0x2127D25,0x211BB33,0x210F9A6,0x210387F,0x20F77BD,0x20EB75F,0x20DF765,0x20D37CE, 0x20C789B,0x20BB9CA,0x20AFB5C,0x20A3D50,0x2097FA6,0x208C25C,0x2080574,0x20748EC,0x2068CC4,0x205D0FC,0x2051593, 0x2045A88,0x2039FDD,0x202E58F,0x2022BA0,0x201720E,0x200B8D8,0x2000000,0x1FF4784,0x1FE8F64,0x1FDD79F,0x1FD2036, 0x1FC6928,0x1FBB274,0x1FAFC1A,0x1FA461A,0x1F99074,0x1F8DB27,0x1F82633,0x1F77197,0x1F6BD53,0x1F60968,0x1F555D3, 0x1F4A296,0x1F3EFB0,0x1F33D20,0x1F28AE6,0x1F1D903,0x1F12774,0x1F0763B,0x1EFC557,0x1EF14C7,0x1EE648C,0x1EDB4A5, 0x1ED0511,0x1EC55D0,0x1EBA6E3,0x1EAF848,0x1EA49FF,0x1E99C09,0x1E8EE64,0x1E84111,0x1E79410,0x1E6E75F,0x1E63AFE, 0x1E58EEE,0x1E4E32E,0x1E437BE,0x1E38C9D,0x1E2E1CB,0x1E23748,0x1E18D14,0x1E0E32E,0x1E03996,0x1DF904C,0x1DEE74F, 0x1DE3E9F,0x1DD963D,0x1DCEE27,0x1DC465D,0x1DB9EDF,0x1DAF7AD,0x1DA50C7,0x1D9AA2C,0x1D903DC,0x1D85DD7,0x1D7B81C, 0x1D712AC,0x1D66D86,0x1D5C8A9,0x1D52416,0x1D47FCC,0x1D3DBCA,0x1D33812,0x1D294A2,0x1D1F17A,0x1D14E9B,0x1D0AC02, 0x1D009B2,0x1CF67A8,0x1CEC5E6,0x1CE246A,0x1CD8335,0x1CCE246,0x1CC419D,0x1CBA13A,0x1CB011C,0x1CA6144,0x1C9C1B0, 0x1C92262,0x1C88358,0x1C7E492,0x1C74611,0x1C6A7D4,0x1C609DA,0x1C56C23,0x1C4CEB0,0x1C43180,0x1C39493,0x1C2F7E8, 0x1C25B80,0x1C1BF5A,0x1C12375,0x1C087D3,0x1BFEC71,0x1BF5151,0x1BEB673,0x1BE1BD5,0x1BD8177,0x1BCE75A,0x1BC4D7D, 0x1BBB3E1,0x1BB1A84,0x1BA8166,0x1B9E888,0x1B94FE9,0x1B8B789,0x1B81F68,0x1B78786,0x1B6EFE1,0x1B6587B,0x1B5C153, 0x1B52A69,0x1B493BC,0x1B3FD4D,0x1B3671A,0x1B2D125,0x1B23B6D,0x1B1A5F1,0x1B110B1,0x1B07BAE,0x1AFE6E7,0x1AF525C, 0x1AEBE0C,0x1AE29F8,0x1AD961F,0x1AD0281,0x1AC6F1E,0x1ABDBF6,0x1AB4908,0x1AAB655,0x1AA23DC,0x1A9919C,0x1A8FF97, 0x1A86DCB,0x1A7DC39,0x1A74AE0,0x1A6B9C0,0x1A628DA,0x1A5982B,0x1A507B6,0x1A47779,0x1A3E774,0x1A357A7,0x1A2C812, 0x1A238B5,0x1A1A98F,0x1A11AA1,0x1A08BEA,0x19FFD6A,0x19F6F21,0x19EE10F,0x19E5333,0x19DC58E,0x19D381F,0x19CAAE6, 0x19C1DE3,0x19B9116,0x19B047E,0x19A781C,0x199EBEF,0x1995FF7,0x198D434,0x19848A6,0x197BD4D,0x1973228,0x196A737, 0x1961C7B,0x19591F3,0x195079E,0x1947D7D,0x193F390,0x19369D7,0x192E050,0x19256FD,0x191CDDD,0x19144EF,0x190BC34, 0x19033AC,0x18FAB56,0x18F2333,0x18E9B41,0x18E1382,0x18D8BF4,0x18D0498,0x18C7D6E,0x18BF675,0x18B6FAD,0x18AE916, 0x18A62B0,0x189DC7C,0x1895677,0x188D0A4,0x1884B01,0x187C58E,0x187404B,0x186BB38,0x1863655,0x185B1A2,0x1852D1F, 0x184A8CB,0x18424A6,0x183A0B1,0x1831CEA,0x1829953,0x18215EA,0x18192B0,0x1810FA5,0x1808CC8,0x1800A1A,0x17F8799, 0x17F0547,0x17E8322,0x17E012C,0x17D7F63,0x17CFDC7,0x17C7C59,0x17BFB18,0x17B7A05,0x17AF91E,0x17A7865,0x179F7D8, 0x1797778,0x178F744,0x178773D,0x177F762,0x17777B4,0x176F831,0x17678DB,0x175F9B0,0x1757AB1,0x174FBDE,0x1747D36, 0x173FEBA,0x1738068,0x1730242,0x1728447,0x1720677,0x17188D2,0x1710B57,0x1708E07,0x17010E1,0x16F93E6,0x16F1715, 0x16E9A6E,0x16E1DF1,0x16DA19E,0x16D2575,0x16CA976,0x16C2DA0,0x16BB1F3,0x16B3670,0x16ABB16,0x16A3FE6,0x169C4DE, 0x16949FF,0x168CF49,0x16854BC,0x167DA58,0x167601C,0x166E608,0x1666C1D,0x165F25A,0x16578BE,0x164FF4B,0x1648600, 0x1640CDD,0x16393E1,0x1631B0D,0x162A260,0x16229DB,0x161B17D,0x1613946,0x160C136,0x160494D,0x15FD18C,0x15F59F0, 0x15EE27C,0x15E6B2E,0x15DF407,0x15D7D06,0x15D062B,0x15C8F77,0x15C18E8,0x15BA280,0x15B2C3E,0x15AB621,0x15A402A, 0x159CA59,0x15954AD,0x158DF27,0x15869C6,0x157F48A,0x1577F74,0x1570A82,0x15695B6,0x156210E,0x155AC8C,0x155382E, 0x154C3F4,0x1544FDF,0x153DBEF,0x1536823,0x152F47B,0x15280F7,0x1520D98,0x1519A5C,0x1512744,0x150B450,0x1504180, 0x14FCED4,0x14F5C4B,0x14EE9E6,0x14E77A4,0x14E0585,0x14D9389,0x14D21B1,0x14CAFFC,0x14C3E69,0x14BCCFA,0x14B5BAD, 0x14AEA83,0x14A797C,0x14A0897,0x14997D5,0x1492735,0x148B6B7,0x148465C,0x147D622,0x147660B,0x146F616,0x1468643, 0x1461691,0x145A701,0x1453793,0x144C847,0x144591C,0x143EA12,0x1437B2A,0x1430C63,0x1429DBD,0x1422F38,0x141C0D5, 0x1415292,0x140E470,0x140766F,0x140088F,0x13F9ACF,0x13F2D30,0x13EBFB1,0x13E5253,0x13DE515,0x13D77F8,0x13D0AFA, 0x13C9E1D,0x13C3160,0x13BC4C3,0x13B5846,0x13AEBE8,0x13A7FAB,0x13A138D,0x139A78E,0x1393BAF,0x138CFF0,0x1386450, 0x137F8CF,0x1378D6E,0x137222C,0x136B709,0x1364C05,0x135E11F,0x1357659,0x1350BB2,0x134A129,0x13436C0,0x133CC74, 0x1336248,0x132F839,0x1328E4A,0x1322478,0x131BAC5,0x1315130,0x130E7B9,0x1307E61,0x1301526,0x12FAC09,0x12F430A, 0x12EDA29,0x12E7166,0x12E08C0,0x12DA038,0x12D37CE,0x12CCF81,0x12C6751,0x12BFF3F,0x12B974A,0x12B2F73,0x12AC7B8, 0x12A601B,0x129F89B,0x1299137,0x12929F1,0x128C2C7,0x1285BBA,0x127F4CA,0x1278DF7,0x1272740,0x126C0A6,0x1265A28, 0x125F3C6,0x1258D81,0x1252758,0x124C14C,0x1245B5C,0x123F587,0x1238FCF,0x1232A33,0x122C4B2,0x1225F4E,0x121FA05, 0x12194D8,0x1212FC7,0x120CAD1,0x12065F7,0x1200139,0x11F9C96,0x11F380E,0x11ED3A2,0x11E6F51,0x11E0B1B,0x11DA700, 0x11D4301,0x11CDF1C,0x11C7B53,0x11C17A4,0x11BB410,0x11B5097,0x11AED39,0x11A89F6,0x11A26CD,0x119C3BF,0x11960CB, 0x118FDF2,0x1189B33,0x118388F,0x117D605,0x1177395,0x117113F,0x116AF04,0x1164CE2,0x115EADB,0x11588EE,0x115271A, 0x114C561,0x11463C1,0x114023B,0x113A0CF,0x1133F7D,0x112DE44,0x1127D25,0x1121C1F,0x111BB33,0x1115A60,0x110F9A6, 0x1109906,0x110387F,0x10FD811,0x10F77BD,0x10F1781,0x10EB75F,0x10E5755,0x10DF765,0x10D978D,0x10D37CE,0x10CD828, 0x10C789B,0x10C1926,0x10BB9CA,0x10B5A87,0x10AFB5C,0x10A9C4A,0x10A3D50,0x109DE6F,0x1097FA6,0x10920F5,0x108C25C, 0x10863DC,0x1080574,0x107A724,0x10748EC,0x106EACC,0x1068CC4,0x1062ED4,0x105D0FC,0x105733B,0x1051593,0x104B802, 0x1045A88,0x103FD27,0x1039FDD,0x10342AA,0x102E58F,0x102888C,0x1022BA0,0x101CECB,0x101720E,0x1011567,0x100B8D8, 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0x863DC,0x834A5,0x80574,0x7D649,0x7A724,0x77805,0x748EC,0x719D9,0x6EACC,0x6BBC5,0x68CC4, 0x65DC9,0x62ED4,0x5FFE5,0x5D0FC,0x5A218,0x5733B,0x54464,0x51593,0x4E6C7,0x4B802,0x48942, 0x45A88,0x42BD5,0x3FD27,0x3CE7F,0x39FDD,0x37141,0x342AA,0x3141A,0x2E58F,0x2B70B,0x2888C, 0x25A13,0x22BA0,0x1FD33,0x1CECB,0x1A069,0x1720E,0x143B8,0x11567,0xE71D,0xB8D8,0x8A9A, 0x5C61,0x2E2D }; #define LZHAM_CREATE_PROB_COST_TABLE 0 #if LZHAM_CREATE_PROB_COST_TABLE class arith_prob_cost_initializer { public: arith_prob_cost_initializer() { const double cInvLn2 = 1.4426950408889634073599246810019; // 1.0/ln(2) for (uint i = 0; i < cSymbolCodecArithProbScale; i++) { double flBits = i ? (-log(i * (1.0 / cSymbolCodecArithProbScale)) * cInvLn2) : 0; g_prob_cost[i] = static_cast(floor(.5f + flBits * cBitCostScale)); printf("0x%X,", g_prob_cost[i]); if ((i % 11) == 10) printf("\n"); } printf("\n"); } }; static arith_prob_cost_initializer g_prob_cost_initializer; #endif raw_quasi_adaptive_huffman_data_model::raw_quasi_adaptive_huffman_data_model(bool encoding, uint total_syms, uint max_update_interval, uint adapt_rate) : m_pDecode_tables(NULL), m_total_syms(0), m_max_cycle(0), m_update_cycle(0), m_symbols_until_update(0), m_total_count(0), m_decoder_table_bits(0), m_max_update_interval(static_cast(max_update_interval)), m_adapt_rate(static_cast(adapt_rate)), m_encoding(encoding) { if (total_syms) { init2(encoding, total_syms, max_update_interval, adapt_rate, NULL); } } raw_quasi_adaptive_huffman_data_model::raw_quasi_adaptive_huffman_data_model(const raw_quasi_adaptive_huffman_data_model& other) : m_pDecode_tables(NULL), m_total_syms(0), m_max_cycle(0), m_update_cycle(0), m_symbols_until_update(0), m_total_count(0), m_decoder_table_bits(0), m_max_update_interval(0), m_adapt_rate(0), m_encoding(false) { *this = other; } raw_quasi_adaptive_huffman_data_model::~raw_quasi_adaptive_huffman_data_model() { if (m_pDecode_tables) lzham_delete(m_pDecode_tables); } bool raw_quasi_adaptive_huffman_data_model::assign(const raw_quasi_adaptive_huffman_data_model& rhs) { if (this == &rhs) return true; m_total_syms = rhs.m_total_syms; m_max_cycle = rhs.m_max_cycle; m_update_cycle = rhs.m_update_cycle; m_symbols_until_update = rhs.m_symbols_until_update; m_total_count = rhs.m_total_count; m_sym_freq = rhs.m_sym_freq; m_initial_sym_freq = rhs.m_initial_sym_freq; m_codes = rhs.m_codes; m_code_sizes = rhs.m_code_sizes; if (rhs.m_pDecode_tables) { if (m_pDecode_tables) { if (!m_pDecode_tables->assign(*rhs.m_pDecode_tables)) { clear(); return false; } } else { m_pDecode_tables = lzham_new(*rhs.m_pDecode_tables); if (!m_pDecode_tables) { clear(); return false; } } } else if (m_pDecode_tables) { lzham_delete(m_pDecode_tables); m_pDecode_tables = NULL; } m_decoder_table_bits = rhs.m_decoder_table_bits; m_encoding = rhs.m_encoding; m_max_update_interval = rhs.m_max_update_interval; m_adapt_rate = rhs.m_adapt_rate; return true; } raw_quasi_adaptive_huffman_data_model& raw_quasi_adaptive_huffman_data_model::operator= (const raw_quasi_adaptive_huffman_data_model& rhs) { assign(rhs); return *this; } void raw_quasi_adaptive_huffman_data_model::clear() { m_sym_freq.clear(); m_initial_sym_freq.clear(); m_codes.clear(); m_code_sizes.clear(); m_max_cycle = 0; m_total_syms = 0; m_update_cycle = 0; m_symbols_until_update = 0; m_decoder_table_bits = 0; m_total_count = 0; if (m_pDecode_tables) { lzham_delete(m_pDecode_tables); m_pDecode_tables = NULL; } m_max_update_interval = 0; m_adapt_rate = 0; } bool raw_quasi_adaptive_huffman_data_model::init2(bool encoding, uint total_syms, uint max_update_interval, uint adapt_rate, const uint16 *pInitial_sym_freq) { LZHAM_ASSERT(max_update_interval <= 0xFFFF); LZHAM_ASSERT(adapt_rate <= 0xFFFF); m_encoding = encoding; m_max_update_interval = static_cast(max_update_interval); m_adapt_rate = static_cast(adapt_rate); m_symbols_until_update = 0; if (!m_sym_freq.try_resize(total_syms)) { clear(); return false; } if (pInitial_sym_freq) { if (!m_initial_sym_freq.try_resize(total_syms)) { clear(); return false; } memcpy(m_initial_sym_freq.begin(), pInitial_sym_freq, total_syms * m_initial_sym_freq.size_in_bytes()); } if (!m_code_sizes.try_resize(total_syms)) { clear(); return false; } m_total_syms = total_syms; uint max_table_bits = 0; if (m_total_syms <= 8) max_table_bits = 4; else max_table_bits = 1 + math::ceil_log2i(m_total_syms); m_decoder_table_bits = static_cast(math::minimum(max_table_bits, prefix_coding::cMaxTableBits)); if (m_encoding) { lzham_delete(m_pDecode_tables); m_pDecode_tables = NULL; if (!m_codes.try_resize(total_syms)) { clear(); return false; } } else if (!m_pDecode_tables) { m_pDecode_tables = lzham_new(); if (!m_pDecode_tables) { clear(); return false; } } m_max_cycle = (LZHAM_MAX(24, m_total_syms) + 6) * (m_max_update_interval ? m_max_update_interval : LZHAM_DEFAULT_MAX_UPDATE_INTERVAL); m_max_cycle = LZHAM_MIN(m_max_cycle, 32767); reset(); return true; } bool raw_quasi_adaptive_huffman_data_model::reset() { if (!m_total_syms) return true; bool sym_freq_all_ones = false; if (m_initial_sym_freq.size()) { m_update_cycle = 0; for (uint i = 0; i < m_total_syms; i++) { uint sym_freq = m_initial_sym_freq[i]; m_sym_freq[i] = static_cast(sym_freq); // Slam m_update_cycle to a specific value so update_tables() sets m_total_count to the proper value m_update_cycle += sym_freq; } } else { for (uint i = 0; i < m_total_syms; i++) m_sym_freq[i] = 1; // Slam m_update_cycle to a specific value so update_tables() sets m_total_count to the proper value m_update_cycle = m_total_syms; sym_freq_all_ones = true; } m_total_count = 0; m_symbols_until_update = 0; if (!update_tables(LZHAM_MIN(m_max_cycle, 16), sym_freq_all_ones)) // this was 8 in the alphas return false; return true; } void raw_quasi_adaptive_huffman_data_model::rescale() { uint total_freq = 0; for (uint i = 0; i < m_total_syms; i++) { uint freq = (m_sym_freq[i] + 1) >> 1; total_freq += freq; m_sym_freq[i] = static_cast(freq); } m_total_count = total_freq; } void raw_quasi_adaptive_huffman_data_model::reset_update_rate() { m_total_count += (m_update_cycle - m_symbols_until_update); #ifdef _DEBUG uint actual_total = 0; for (uint i = 0; i < m_sym_freq.size(); i++) actual_total += m_sym_freq[i]; LZHAM_ASSERT(actual_total == m_total_count); #endif if (m_total_count > m_total_syms) rescale(); m_symbols_until_update = m_update_cycle = LZHAM_MIN(8, m_update_cycle); } bool raw_quasi_adaptive_huffman_data_model::update_tables(int force_update_cycle, bool sym_freq_all_ones) { LZHAM_ASSERT(!m_symbols_until_update); m_total_count += m_update_cycle; LZHAM_ASSERT(m_total_count <= 65535); while (m_total_count >= 32768) rescale(); uint max_code_size = 0; if ((sym_freq_all_ones) && (m_total_syms >= 2)) { // Shortcut building the Huffman codes if we know all the sym freqs are 1. uint base_code_size = math::floor_log2i(m_total_syms); uint num_left = m_total_syms - (1 << base_code_size); num_left *= 2; if (num_left > m_total_syms) num_left = m_total_syms; memset(&m_code_sizes[0], base_code_size + 1, num_left); memset(&m_code_sizes[num_left], base_code_size, m_total_syms - num_left); max_code_size = base_code_size + (num_left ? 1 : 0); } bool status = false; if (!max_code_size) { uint table_size = get_generate_huffman_codes_table_size(); void *pTables = alloca(table_size); uint total_freq = 0; status = generate_huffman_codes(pTables, m_total_syms, &m_sym_freq[0], &m_code_sizes[0], max_code_size, total_freq); LZHAM_ASSERT(status); LZHAM_ASSERT(total_freq == m_total_count); if ((!status) || (total_freq != m_total_count)) return false; if (max_code_size > prefix_coding::cMaxExpectedCodeSize) { status = prefix_coding::limit_max_code_size(m_total_syms, &m_code_sizes[0], prefix_coding::cMaxExpectedCodeSize); LZHAM_ASSERT(status); if (!status) return false; } } if (force_update_cycle >= 0) m_symbols_until_update = m_update_cycle = force_update_cycle; else { m_update_cycle = (31U + m_update_cycle * LZHAM_MAX(32U, (m_adapt_rate ? m_adapt_rate : LZHAM_DEFAULT_ADAPT_RATE))) >> 5U; if (m_update_cycle > m_max_cycle) m_update_cycle = m_max_cycle; m_symbols_until_update = m_update_cycle; } if (m_encoding) status = prefix_coding::generate_codes(m_total_syms, &m_code_sizes[0], &m_codes[0]); else { uint actual_table_bits = m_decoder_table_bits; // Try to see if using the accel table is actually worth the trouble of constructing it. uint cost_to_use_table = (1 << actual_table_bits) + 64; uint cost_to_not_use_table = m_symbols_until_update * math::floor_log2i(m_total_syms); if (cost_to_not_use_table <= cost_to_use_table) actual_table_bits = 0; status = prefix_coding::generate_decoder_tables(m_total_syms, &m_code_sizes[0], m_pDecode_tables, actual_table_bits); } LZHAM_ASSERT(status); if (!status) return false; return true; } bool raw_quasi_adaptive_huffman_data_model::update_sym(uint sym) { uint freq = m_sym_freq[sym]; freq++; m_sym_freq[sym] = static_cast(freq); LZHAM_ASSERT(freq <= UINT16_MAX); if (--m_symbols_until_update == 0) { if (!update_tables()) return false; } return true; } adaptive_bit_model::adaptive_bit_model(float prob0) { set_probability_0(prob0); } adaptive_bit_model::adaptive_bit_model(const adaptive_bit_model& other) : m_bit_0_prob(other.m_bit_0_prob) { } void adaptive_bit_model::set_probability_0(float prob0) { m_bit_0_prob = static_cast(math::clamp((uint)(prob0 * cSymbolCodecArithProbScale), 1, cSymbolCodecArithProbScale - 1)); } adaptive_arith_data_model::adaptive_arith_data_model(bool encoding, uint total_syms) { init(encoding, total_syms); } adaptive_arith_data_model::adaptive_arith_data_model(const adaptive_arith_data_model& other) { m_total_syms = other.m_total_syms; m_probs = other.m_probs; } adaptive_arith_data_model::~adaptive_arith_data_model() { } adaptive_arith_data_model& adaptive_arith_data_model::operator= (const adaptive_arith_data_model& rhs) { m_total_syms = rhs.m_total_syms; m_probs = rhs.m_probs; return *this; } void adaptive_arith_data_model::clear() { m_total_syms = 0; m_probs.clear(); } bool adaptive_arith_data_model::init(bool encoding, uint total_syms) { LZHAM_NOTE_UNUSED(encoding); if (!total_syms) { clear(); return true; } if ((total_syms < 2) || (!math::is_power_of_2(total_syms))) total_syms = math::next_pow2(total_syms); m_total_syms = total_syms; if (!m_probs.try_resize(m_total_syms)) return false; return true; } void adaptive_arith_data_model::reset() { for (uint i = 0; i < m_probs.size(); i++) m_probs[i].clear(); } void adaptive_arith_data_model::reset_update_rate() { } bool adaptive_arith_data_model::update(uint sym) { uint node = 1; uint bitmask = m_total_syms; do { bitmask >>= 1; uint bit = (sym & bitmask) ? 1 : 0; m_probs[node].update(bit); node = (node << 1) + bit; } while (bitmask > 1); return true; } bit_cost_t adaptive_arith_data_model::get_cost(uint sym) const { uint node = 1; uint bitmask = m_total_syms; bit_cost_t cost = 0; do { bitmask >>= 1; uint bit = (sym & bitmask) ? 1 : 0; cost += m_probs[node].get_cost(bit); node = (node << 1) + bit; } while (bitmask > 1); return cost; } symbol_codec::symbol_codec() { clear(); } void symbol_codec::reset() { m_pDecode_buf = NULL; m_pDecode_buf_next = NULL; m_pDecode_buf_end = NULL; m_decode_buf_size = 0; m_bit_buf = 0; m_bit_count = 0; m_total_model_updates = 0; m_mode = cNull; m_total_bits_written = 0; m_arith_base = 0; m_arith_value = 0; m_arith_length = 0; m_arith_total_bits = 0; m_output_buf.try_resize(0); m_arith_output_buf.try_resize(0); m_output_syms.try_resize(0); m_pDecode_need_bytes_func = NULL; m_pDecode_private_data = NULL; m_pSaved_huff_model = NULL; m_pSaved_model = NULL; m_saved_node_index = 0; } void symbol_codec::clear() { reset(); m_output_buf.clear(); m_arith_output_buf.clear(); m_output_syms.clear(); } bool symbol_codec::start_encoding(uint expected_file_size) { m_mode = cEncoding; m_total_model_updates = 0; m_total_bits_written = 0; if (!put_bits_init(expected_file_size)) return false; m_output_syms.try_resize(0); arith_start_encoding(); return true; } bool symbol_codec::encode_bits(uint bits, uint num_bits) { LZHAM_ASSERT(m_mode == cEncoding); if (!num_bits) return true; LZHAM_ASSERT((num_bits == 32) || (bits <= ((1U << num_bits) - 1))); if (num_bits > 16) { if (!record_put_bits(bits >> 16, num_bits - 16)) return false; if (!record_put_bits(bits & 0xFFFF, 16)) return false; } else { if (!record_put_bits(bits, num_bits)) return false; } return true; } bool symbol_codec::encode_arith_init() { LZHAM_ASSERT(m_mode == cEncoding); output_symbol sym; sym.m_bits = 0; sym.m_num_bits = output_symbol::cArithInit; sym.m_arith_prob0 = 0; if (!m_output_syms.try_push_back(sym)) return false; return true; } bool symbol_codec::encode_align_to_byte() { LZHAM_ASSERT(m_mode == cEncoding); output_symbol sym; sym.m_bits = 0; sym.m_num_bits = output_symbol::cAlignToByteSym; sym.m_arith_prob0 = 0; if (!m_output_syms.try_push_back(sym)) return false; return true; } bool symbol_codec::encode(uint sym, quasi_adaptive_huffman_data_model& model) { LZHAM_ASSERT(m_mode == cEncoding); LZHAM_ASSERT(model.m_encoding); if (!record_put_bits(model.m_codes[sym], model.m_code_sizes[sym])) return false; uint freq = model.m_sym_freq[sym]; freq++; model.m_sym_freq[sym] = static_cast(freq); LZHAM_ASSERT(freq <= UINT16_MAX); if (--model.m_symbols_until_update == 0) { m_total_model_updates++; if (!model.update_tables()) return false; } return true; } void symbol_codec::arith_propagate_carry() { int index = m_arith_output_buf.size() - 1; while (index >= 0) { uint c = m_arith_output_buf[index]; if (c == 0xFF) m_arith_output_buf[index] = 0; else { m_arith_output_buf[index]++; break; } index--; } } bool symbol_codec::arith_renorm_enc_interval() { do { if (!m_arith_output_buf.try_push_back((m_arith_base >> 24) & 0xFF)) return false; m_total_bits_written += 8; m_arith_base <<= 8; } while ((m_arith_length <<= 8) < cSymbolCodecArithMinLen); return true; } void symbol_codec::arith_start_encoding() { m_arith_output_buf.try_resize(0); m_arith_base = 0; m_arith_value = 0; m_arith_length = cSymbolCodecArithMaxLen; m_arith_total_bits = 0; } bool symbol_codec::encode(uint bit, adaptive_bit_model& model, bool update_model) { LZHAM_ASSERT(m_mode == cEncoding); m_arith_total_bits++; output_symbol sym; sym.m_bits = bit; sym.m_num_bits = -1; sym.m_arith_prob0 = model.m_bit_0_prob; if (!m_output_syms.try_push_back(sym)) return false; uint x = model.m_bit_0_prob * (m_arith_length >> cSymbolCodecArithProbBits); if (!bit) { if (update_model) model.m_bit_0_prob += ((cSymbolCodecArithProbScale - model.m_bit_0_prob) >> cSymbolCodecArithProbMoveBits); m_arith_length = x; } else { if (update_model) model.m_bit_0_prob -= (model.m_bit_0_prob >> cSymbolCodecArithProbMoveBits); uint orig_base = m_arith_base; m_arith_base += x; m_arith_length -= x; if (orig_base > m_arith_base) arith_propagate_carry(); } if (m_arith_length < cSymbolCodecArithMinLen) { if (!arith_renorm_enc_interval()) return false; } return true; } bool symbol_codec::encode(uint sym, adaptive_arith_data_model& model) { uint node = 1; uint bitmask = model.m_total_syms; do { bitmask >>= 1; uint bit = (sym & bitmask) ? 1 : 0; if (!encode(bit, model.m_probs[node])) return false; node = (node << 1) + bit; } while (bitmask > 1); return true; } bool symbol_codec::arith_stop_encoding() { uint orig_base = m_arith_base; if (m_arith_length > 2 * cSymbolCodecArithMinLen) { m_arith_base += cSymbolCodecArithMinLen; m_arith_length = (cSymbolCodecArithMinLen >> 1); } else { m_arith_base += (cSymbolCodecArithMinLen >> 1); m_arith_length = (cSymbolCodecArithMinLen >> 9); } if (orig_base > m_arith_base) arith_propagate_carry(); if (!arith_renorm_enc_interval()) return false; while (m_arith_output_buf.size() < 4) { if (!m_arith_output_buf.try_push_back(0)) return false; m_total_bits_written += 8; } return true; } bool symbol_codec::stop_encoding(bool support_arith) { LZHAM_ASSERT(m_mode == cEncoding); if (support_arith) { if (!arith_stop_encoding()) return false; } if (!assemble_output_buf()) return false; m_mode = cNull; return true; } bool symbol_codec::record_put_bits(uint bits, uint num_bits) { LZHAM_ASSERT(m_mode == cEncoding); LZHAM_ASSERT(num_bits <= 25); LZHAM_ASSERT(m_bit_count >= 25); if (!num_bits) return true; m_total_bits_written += num_bits; output_symbol sym; sym.m_bits = bits; sym.m_num_bits = (uint16)num_bits; sym.m_arith_prob0 = 0; if (!m_output_syms.try_push_back(sym)) return false; return true; } bool symbol_codec::put_bits_init(uint expected_size) { m_bit_buf = 0; m_bit_count = cBitBufSize; m_output_buf.try_resize(0); if (!m_output_buf.try_reserve(expected_size)) return false; return true; } bool symbol_codec::put_bits(uint bits, uint num_bits) { LZHAM_ASSERT(num_bits <= 25); LZHAM_ASSERT(m_bit_count >= 25); if (!num_bits) return true; m_bit_count -= num_bits; m_bit_buf |= (static_cast(bits) << m_bit_count); m_total_bits_written += num_bits; while (m_bit_count <= (cBitBufSize - 8)) { if (!m_output_buf.try_push_back(static_cast(m_bit_buf >> (cBitBufSize - 8)))) return false; m_bit_buf <<= 8; m_bit_count += 8; } return true; } bool symbol_codec::put_bits_align_to_byte() { uint num_bits_in = cBitBufSize - m_bit_count; if (num_bits_in & 7) { if (!put_bits(0, 8 - (num_bits_in & 7))) return false; } return true; } bool symbol_codec::flush_bits() { return put_bits(0, 7); // to ensure the last bits are flushed } bool symbol_codec::assemble_output_buf() { m_total_bits_written = 0; uint arith_buf_ofs = 0; // Intermix the final Arithmetic, Huffman, or plain bits to a single combined bitstream. // All bits from each source must be output in exactly the same order that the decompressor will read them. for (uint sym_index = 0; sym_index < m_output_syms.size(); sym_index++) { const output_symbol& sym = m_output_syms[sym_index]; if (sym.m_num_bits == output_symbol::cAlignToByteSym) { if (!put_bits_align_to_byte()) return false; } else if (sym.m_num_bits == output_symbol::cArithInit) { LZHAM_ASSERT(m_arith_output_buf.size()); if (m_arith_output_buf.size()) { m_arith_length = cSymbolCodecArithMaxLen; m_arith_value = 0; for (uint i = 0; i < 4; i++) { const uint c = m_arith_output_buf[arith_buf_ofs++]; m_arith_value = (m_arith_value << 8) | c; if (!put_bits(c, 8)) return false; } } } else if (sym.m_num_bits == output_symbol::cArithSym) { // This renorm logic must match the logic used in the arithmetic decoder. if (m_arith_length < cSymbolCodecArithMinLen) { do { const uint c = (arith_buf_ofs < m_arith_output_buf.size()) ? m_arith_output_buf[arith_buf_ofs++] : 0; if (!put_bits(c, 8)) return false; m_arith_value = (m_arith_value << 8) | c; } while ((m_arith_length <<= 8) < cSymbolCodecArithMinLen); } uint x = sym.m_arith_prob0 * (m_arith_length >> cSymbolCodecArithProbBits); uint bit = (m_arith_value >= x); if (bit == 0) { m_arith_length = x; } else { m_arith_value -= x; m_arith_length -= x; } LZHAM_VERIFY(bit == sym.m_bits); } else { // Huffman or plain bits if (!put_bits(sym.m_bits, sym.m_num_bits)) return false; } } return flush_bits(); } //------------------------------------------------------------------------------------------------------------------ // Decoding //------------------------------------------------------------------------------------------------------------------ bool symbol_codec::start_decoding(const uint8* pBuf, size_t buf_size, bool eof_flag, need_bytes_func_ptr pNeed_bytes_func, void *pPrivate_data) { if (!buf_size) return false; m_total_model_updates = 0; m_pDecode_buf = pBuf; m_pDecode_buf_next = pBuf; m_decode_buf_size = buf_size; m_pDecode_buf_end = pBuf + buf_size; m_pDecode_need_bytes_func = pNeed_bytes_func; m_pDecode_private_data = pPrivate_data; m_decode_buf_eof = eof_flag; m_bit_buf = 0; m_bit_count = 0; m_mode = cDecoding; return true; } uint symbol_codec::decode_bits(uint num_bits) { LZHAM_ASSERT(m_mode == cDecoding); if (!num_bits) return 0; if (num_bits > 16) { uint a = get_bits(num_bits - 16); uint b = get_bits(16); return (a << 16) | b; } else return get_bits(num_bits); } void symbol_codec::decode_remove_bits(uint num_bits) { LZHAM_ASSERT(m_mode == cDecoding); while (num_bits > 16) { remove_bits(16); num_bits -= 16; } remove_bits(num_bits); } uint symbol_codec::decode_peek_bits(uint num_bits) { LZHAM_ASSERT(m_mode == cDecoding); LZHAM_ASSERT(num_bits <= 25); if (!num_bits) return 0; while (m_bit_count < (int)num_bits) { uint c = 0; if (m_pDecode_buf_next == m_pDecode_buf_end) { if (!m_decode_buf_eof) { m_pDecode_need_bytes_func(m_pDecode_buf_next - m_pDecode_buf, m_pDecode_private_data, m_pDecode_buf, m_decode_buf_size, m_decode_buf_eof); m_pDecode_buf_end = m_pDecode_buf + m_decode_buf_size; m_pDecode_buf_next = m_pDecode_buf; if (m_pDecode_buf_next < m_pDecode_buf_end) c = *m_pDecode_buf_next++; } } else c = *m_pDecode_buf_next++; m_bit_count += 8; LZHAM_ASSERT(m_bit_count <= cBitBufSize); m_bit_buf |= (static_cast(c) << (cBitBufSize - m_bit_count)); } return static_cast(m_bit_buf >> (cBitBufSize - num_bits)); } uint symbol_codec::decode(quasi_adaptive_huffman_data_model& model) { LZHAM_ASSERT(m_mode == cDecoding); LZHAM_ASSERT(!model.m_encoding); const prefix_coding::decoder_tables* pTables = model.m_pDecode_tables; while (m_bit_count < (cBitBufSize - 8)) { uint c = 0; if (m_pDecode_buf_next == m_pDecode_buf_end) { if (!m_decode_buf_eof) { m_pDecode_need_bytes_func(m_pDecode_buf_next - m_pDecode_buf, m_pDecode_private_data, m_pDecode_buf, m_decode_buf_size, m_decode_buf_eof); m_pDecode_buf_end = m_pDecode_buf + m_decode_buf_size; m_pDecode_buf_next = m_pDecode_buf; if (m_pDecode_buf_next < m_pDecode_buf_end) c = *m_pDecode_buf_next++; } } else c = *m_pDecode_buf_next++; m_bit_count += 8; m_bit_buf |= (static_cast(c) << (cBitBufSize - m_bit_count)); } uint k = static_cast((m_bit_buf >> (cBitBufSize - 16)) + 1); uint sym, len; if (k <= pTables->m_table_max_code) { uint32 t = pTables->m_lookup[m_bit_buf >> (cBitBufSize - pTables->m_table_bits)]; LZHAM_ASSERT(t != UINT32_MAX); sym = t & UINT16_MAX; len = t >> 16; LZHAM_ASSERT(model.m_code_sizes[sym] == len); } else { len = pTables->m_decode_start_code_size; for ( ; ; ) { if (k <= pTables->m_max_codes[len - 1]) break; len++; } int val_ptr = pTables->m_val_ptrs[len - 1] + static_cast((m_bit_buf >> (cBitBufSize - len))); if (((uint)val_ptr >= model.m_total_syms)) { // corrupted stream, or a bug LZHAM_ASSERT(0); return 0; } sym = pTables->m_sorted_symbol_order[val_ptr]; } m_bit_buf <<= len; m_bit_count -= len; uint freq = model.m_sym_freq[sym]; freq++; model.m_sym_freq[sym] = static_cast(freq); LZHAM_ASSERT(freq <= UINT16_MAX); if (--model.m_symbols_until_update == 0) { m_total_model_updates++; model.update_tables(); } return sym; } uint64 symbol_codec::stop_decoding() { LZHAM_ASSERT(m_mode == cDecoding); uint64 n = m_pDecode_buf_next - m_pDecode_buf; m_mode = cNull; return n; } uint symbol_codec::get_bits(uint num_bits) { LZHAM_ASSERT(num_bits <= 25); if (!num_bits) return 0; while (m_bit_count < (int)num_bits) { uint c = 0; if (m_pDecode_buf_next == m_pDecode_buf_end) { if (!m_decode_buf_eof) { m_pDecode_need_bytes_func(m_pDecode_buf_next - m_pDecode_buf, m_pDecode_private_data, m_pDecode_buf, m_decode_buf_size, m_decode_buf_eof); m_pDecode_buf_end = m_pDecode_buf + m_decode_buf_size; m_pDecode_buf_next = m_pDecode_buf; if (m_pDecode_buf_next < m_pDecode_buf_end) c = *m_pDecode_buf_next++; } } else c = *m_pDecode_buf_next++; m_bit_count += 8; LZHAM_ASSERT(m_bit_count <= cBitBufSize); m_bit_buf |= (static_cast(c) << (cBitBufSize - m_bit_count)); } uint result = static_cast(m_bit_buf >> (cBitBufSize - num_bits)); m_bit_buf <<= num_bits; m_bit_count -= num_bits; return result; } void symbol_codec::remove_bits(uint num_bits) { LZHAM_ASSERT(num_bits <= 25); if (!num_bits) return; while (m_bit_count < (int)num_bits) { uint c = 0; if (m_pDecode_buf_next == m_pDecode_buf_end) { if (!m_decode_buf_eof) { m_pDecode_need_bytes_func(m_pDecode_buf_next - m_pDecode_buf, m_pDecode_private_data, m_pDecode_buf, m_decode_buf_size, m_decode_buf_eof); m_pDecode_buf_end = m_pDecode_buf + m_decode_buf_size; m_pDecode_buf_next = m_pDecode_buf; if (m_pDecode_buf_next < m_pDecode_buf_end) c = *m_pDecode_buf_next++; } } else c = *m_pDecode_buf_next++; m_bit_count += 8; LZHAM_ASSERT(m_bit_count <= cBitBufSize); m_bit_buf |= (static_cast(c) << (cBitBufSize - m_bit_count)); } m_bit_buf <<= num_bits; m_bit_count -= num_bits; } void symbol_codec::decode_align_to_byte() { LZHAM_ASSERT(m_mode == cDecoding); if (m_bit_count & 7) { remove_bits(m_bit_count & 7); } } int symbol_codec::decode_remove_byte_from_bit_buf() { if (m_bit_count < 8) return -1; int result = static_cast(m_bit_buf >> (cBitBufSize - 8)); m_bit_buf <<= 8; m_bit_count -= 8; return result; } uint symbol_codec::decode(adaptive_bit_model& model, bool update_model) { while (m_arith_length < cSymbolCodecArithMinLen) { uint c = get_bits(8); m_arith_value = (m_arith_value << 8) | c; m_arith_length <<= 8; } uint x = model.m_bit_0_prob * (m_arith_length >> cSymbolCodecArithProbBits); uint bit = (m_arith_value >= x); if (!bit) { if (update_model) model.m_bit_0_prob += ((cSymbolCodecArithProbScale - model.m_bit_0_prob) >> cSymbolCodecArithProbMoveBits); m_arith_length = x; } else { if (update_model) model.m_bit_0_prob -= (model.m_bit_0_prob >> cSymbolCodecArithProbMoveBits); m_arith_value -= x; m_arith_length -= x; } return bit; } uint symbol_codec::decode(adaptive_arith_data_model& model) { uint node = 1; do { uint bit = decode(model.m_probs[node]); node = (node << 1) + bit; } while (node < model.m_total_syms); return node - model.m_total_syms; } void symbol_codec::start_arith_decoding() { LZHAM_ASSERT(m_mode == cDecoding); m_arith_length = cSymbolCodecArithMaxLen; m_arith_value = 0; m_arith_value = (get_bits(8) << 24); m_arith_value |= (get_bits(8) << 16); m_arith_value |= (get_bits(8) << 8); m_arith_value |= get_bits(8); } void symbol_codec::decode_need_bytes() { if (!m_decode_buf_eof) { m_pDecode_need_bytes_func(m_pDecode_buf_next - m_pDecode_buf, m_pDecode_private_data, m_pDecode_buf, m_decode_buf_size, m_decode_buf_eof); m_pDecode_buf_end = m_pDecode_buf + m_decode_buf_size; m_pDecode_buf_next = m_pDecode_buf; } } } // namespace lzham