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pascal@152
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1 // #define RC_NORMALIZE if (Range < kTopValue) { Range <<= 8; Code = (Code << 8) | RC_READ_BYTE; }
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pascal@152
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2 //
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pascal@152
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3 // #define IfBit0(p) RC_NORMALIZE; bound = (Range >> kNumBitModelTotalBits) * *(p); if (Code < bound)
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pascal@152
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4 // #define UpdateBit0(p) Range = bound; *(p) += (kBitModelTotal - *(p)) >> kNumMoveBits;
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pascal@152
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5 // #define UpdateBit1(p) Range -= bound; Code -= bound; *(p) -= (*(p)) >> kNumMoveBits;
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pascal@152
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6 //
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pascal@152
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7 //#define RC_GET_BIT2(p, mi, A0, A1) IfBit0(p) \
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pascal@152
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8 // { UpdateBit0(p); mi <<= 1; A0; } else \
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pascal@152
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9 // { UpdateBit1(p); mi = (mi + mi) + 1; A1; }
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pascal@152
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10 //
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pascal@152
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11 // #define RC_GET_BIT(p, mi) RC_GET_BIT2(p, mi, ; , ;)
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pascal@152
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12 //
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pascal@152
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13 // #define RangeDecoderBitTreeDecode(probs, numLevels, res) \
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pascal@152
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14 // { int i = numLevels; res = 1; \
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pascal@152
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15 // do { CProb *p = probs + res; RC_GET_BIT(p, res) } while(--i != 0); \
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pascal@152
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16 // res -= (1 << numLevels); }
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pascal@152
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17 /*
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pascal@152
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18 * Compression with : lzma e src dst -eos -pb2 -lp0 -lc3
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pascal@152
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19 */
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pascal@152
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20
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pascal@169
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21 //#define PROP_PB 2
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pascal@169
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22 #define PROP_PB 0
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pascal@152
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23 #define PROP_LP 0
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pascal@169
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24 //#define PROP_LC 3
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pascal@169
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25 #define PROP_LC 0
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pascal@152
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26 #define PROPS (PROP_LC+(PROP_LP*9)+(PROP_PB*45))
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pascal@152
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27
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pascal@152
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28 // static const Byte *Buffer;
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pascal@152
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29 // static UInt32 bound, Code, Range;
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pascal@152
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30
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pascal@152
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31 /*
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pascal@152
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32 * Buffer register DS:SI
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pascal@152
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33 * all var based ws=ss:bp
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pascal@152
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34 */
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pascal@152
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35
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pascal@152
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36 rep0 = -4 // long
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pascal@152
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37 rep1 = rep0-4 // long
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pascal@152
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38 rep2 = rep0-8 // long
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pascal@152
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39 rep3 = rep0-12 // long
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pascal@152
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40 state = -17 // byte, 0..11
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pascal@152
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41 posState = state-1 // byte, 0..15
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pascal@152
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42 posState2 = posState-1 // byte, 0..15
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pascal@152
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43 scratched = rep0-16 // byte = 1
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pascal@152
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44 Code = -24 // long
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pascal@152
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45 outStream = -28 // long
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pascal@152
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46 nowPos = outStream // long
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pascal@152
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47 Range = Code-8 // long
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pascal@152
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48 #define LOCALS 32
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pascal@152
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49
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pascal@152
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50 // int LzmaDecode(CLzmaDecoderState *vs,
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pascal@152
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51 // const unsigned char *inStream,
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pascal@152
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52 // unsigned char *outStream)
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pascal@152
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53 // {
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pascal@152
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54 // CProb *p = vs->Probs;
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pascal@152
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55 // SizeT nowPos = 0;
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pascal@152
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56 // #define posStateMask = (1 << (vs->Properties.pb)) - 1;
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pascal@152
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57 // #define literalPosMask = (1 << (vs->Properties.lp)) - 1;
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pascal@152
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58 // int lc = vs->Properties.lc, state = 0, len = 0;
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pascal@152
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59 // UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
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pascal@152
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60 //
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pascal@152
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61 // {
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pascal@152
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62 // UInt32 i, numProbs = Literal /*1846*/
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pascal@152
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63 // + ((UInt32)LZMA_LIT_SIZE /*768*/ << (lc + vs->Properties.lp));
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pascal@152
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64 // for (i = 0; i < numProbs; i++) p[i] = kBitModelTotal /*2048*/ >> 1;
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pascal@152
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65
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pascal@152
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66 #define WS (1846+(768<<(PROP_LC+PROP_LP)))
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pascal@152
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67 #if (WS+WS+LOCALS) >= 65000
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pascal@152
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68 /* MAX WS = (1846+(768<<(8+4))) > 3MB! */
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pascal@152
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69 #error invalid (lc,lp,pb) : out of memory
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pascal@152
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70 #endif
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pascal@152
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71
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pascal@152
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72 ws1 = WS
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pascal@152
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73 ws2 = ws1*2
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pascal@152
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74 ws = ws2+LOCALS+15
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pascal@152
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75
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pascal@152
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76 #ifndef FLAT32
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pascal@152
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77 #define AX %ax
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pascal@152
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78 #define BX %bx
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pascal@152
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79 #define CX %cx
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pascal@152
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80 #define DX %dx
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pascal@152
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81 #define SI %si
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pascal@152
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82 #define DI %di
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pascal@152
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83 #define BP %bp
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pascal@152
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84 #define SP %sp
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pascal@152
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85 #define CWD cwd
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pascal@152
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86 #else
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pascal@152
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87 #define AX %eax
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pascal@152
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88 #define BX %ebx
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pascal@152
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89 #define CX %ecx
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pascal@152
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90 #define DX %edx
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pascal@152
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91 #define SI %esi
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pascal@152
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92 #define DI %edi
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pascal@152
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93 #define BP %ebp
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pascal@152
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94 #define SP %esp
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pascal@152
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95 #define CWD cdq
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pascal@152
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96 #endif
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pascal@152
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97 /*
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pascal@152
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98 * LzmaDecode:
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pascal@152
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99 #ifndef FLAT32
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pascal@152
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100 * input ds:si=inStream, es:di=outStream
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pascal@152
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101 * output outStream[], ds:si, es:di
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pascal@152
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102 .code 16
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pascal@152
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103 #else
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pascal@152
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104 * input esi=inStream, edi=outStream
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pascal@152
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105 * output outStream[], esi, edi
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pascal@152
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106 .code 32
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pascal@152
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107 #endif
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pascal@152
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108 */
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pascal@152
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109
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pascal@152
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110 mov $ws1, CX
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pascal@152
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111 #ifdef ONLY8086
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pascal@152
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112 movw $2048/2, %ax
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pascal@152
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113 lzd1:
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pascal@152
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114 pushw %ax
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pascal@152
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115 #else
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pascal@152
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116 lzd1:
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pascal@152
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117 pushw $2048/2
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pascal@152
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118 #endif
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pascal@152
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119 loop lzd1
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pascal@152
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120 mov SP, BP
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pascal@152
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121 movb $((LOCALS+3)/4)*2, %cl
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pascal@152
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122 #ifdef ONLY8086
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pascal@152
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123 movw $1, %ax
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pascal@152
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124 cwd
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pascal@152
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125 initlocals:
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pascal@152
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126 pushw %dx
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pascal@152
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127 pushw %ax
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pascal@152
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128 #else
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pascal@152
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129 initlocals:
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pascal@152
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130 pushl $1
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pascal@152
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131 #endif
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pascal@152
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132 loop initlocals
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pascal@152
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133
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pascal@152
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134 #if !defined(FLAT32) && !defined(FLAT16OUT)
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pascal@152
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135 movb $4, %cl
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pascal@152
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136 movw %es, %bx
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pascal@152
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137 shrw %cl, %bx
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pascal@152
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138 movw %es, %dx
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pascal@152
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139 shlw %cl, %dx
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pascal@152
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140 addw %dx, %di
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pascal@152
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141 movw %di, outStream(%bp)
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pascal@152
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142 adcb %bh, outStream+2(%bp)
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pascal@152
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143 incw %cx
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pascal@152
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144 #else
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pascal@152
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145 movb $5, %cl
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pascal@152
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146 mov DI, outStream(BP)
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pascal@152
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147 #endif
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pascal@152
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148
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pascal@152
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149 // Byte previousByte = 0;
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pascal@152
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150 xor BX, BX
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pascal@152
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151
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pascal@152
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152 // #define RC_INIT(buffer)
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pascal@152
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153 // Buffer = buffer; Code = 0; Range = 0xFFFFFFFF;
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pascal@152
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154 // { int i; for(i=0; i<5; i++) { Code = (Code<<8) | RC_READ_BYTE; }}
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pascal@152
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155 // }
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pascal@152
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156 // RC_INIT(inStream);
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pascal@152
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157
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pascal@152
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158 #ifndef NO_LZMA_HEADER
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pascal@152
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159 #ifdef CHECK_LZMA_HEADER
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pascal@152
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160 cmp.w $0x5A4C, (SI) // lzip header ('LZIP' version:1 dicobits:1)
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pascal@152
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161 je lzip_header
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pascal@152
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162 cmp.w $0x5D, (SI) // lzma header (0x5D dicosz:4 orgsz:8)
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pascal@152
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163 jne no_header
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pascal@152
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164 add $13-6, SI // skip lzma header
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pascal@152
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165 lzip_header:
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pascal@152
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166 add $6, SI // skip lzip header
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pascal@152
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167 no_header:
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pascal@152
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168 #else
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pascal@152
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169 add $13, SI // skip lzma header (0x5D dicosz:4 orgsz:8)
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pascal@152
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170 #endif
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pascal@152
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171 #endif
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pascal@152
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172 setrep:
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pascal@152
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173 call RC_LOAD_BYTE
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pascal@152
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174 decb Range(BP)
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pascal@152
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175 loop setrep
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pascal@152
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176
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pascal@152
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177 lzdmainlp:
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pascal@152
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178 // while(1) {
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pascal@152
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179 // CProb *prob;
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pascal@152
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180 // int posState = (int)((nowPos) & posStateMask);
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pascal@152
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181 //
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pascal@152
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182 // prob = p + IsMatch /*0*/ + (state << kNumPosBitsMax /*4*/) + posState;
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pascal@152
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183 // if (Bit0(prob)) { /* char */
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pascal@152
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184
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pascal@152
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185 xor DX, DX
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pascal@152
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186 call Bit1state // Bit1(dx + (state << kNumPosBitsMax /*4*/) + posState)
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pascal@152
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187 mov $state, DI
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pascal@152
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188 jc lzdstring
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pascal@152
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189
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pascal@152
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190 // prob = p + Literal /*1846*/ + (LZMA_LIT_SIZE /*768*/ *
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pascal@152
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191 // ((((nowPos) & literalPosMask) << lc) + (previousByte >> (8 - lc))));
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pascal@152
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192
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pascal@152
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193 #if PROP_LC != 0
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pascal@152
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194 # ifdef ONLY8086
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pascal@152
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195 movb $8-PROP_LC, %cl
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pascal@152
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196 shrb %cl, %bl
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pascal@152
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197 # else
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pascal@152
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198 shrb $8-PROP_LC, %bl
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pascal@152
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199 # endif
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pascal@152
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200 #endif
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pascal@152
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201
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pascal@152
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202 #if PROP_LP != 0
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pascal@152
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203 movb posState2(BP), %dl
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pascal@152
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204 # ifdef ONLY8086
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pascal@152
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205 movb $PROP_LC, %cl
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pascal@152
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206 shl %cl, DX
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pascal@152
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207 # else
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pascal@152
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208 shl $PROP_LC, DX
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pascal@152
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209 # endif
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pascal@152
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210 movb $0, %bh
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pascal@152
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211 add BX, DX
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pascal@152
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212 #endif
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pascal@152
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213
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pascal@152
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214 movb $3, %ah
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pascal@152
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215 mul BX // dx = 3*bh
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pascal@152
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216 add $1846, AX
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pascal@152
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217
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pascal@152
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218 // int symbol = 1;
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pascal@152
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219
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pascal@152
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220 CWD
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pascal@152
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221 inc DX // symbol = 1
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pascal@152
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222 xchg AX, CX // save prob
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pascal@152
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223
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pascal@152
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224 // if (state >= kNumLitStates /*7*/) { /* previous was string */
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pascal@152
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225 // if (state < 4) state = 0;
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pascal@152
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226
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pascal@152
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227 lzd6z:
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pascal@152
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228 subb $3, (BP, DI)
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pascal@152
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229
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pascal@152
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230 // if (state < 4) state = 0;
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pascal@152
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231
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pascal@152
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232 jnc lzd6
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pascal@152
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233 movb %dh, (BP, DI) // %dh = 0
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pascal@152
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234
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pascal@152
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235 lzd6:
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pascal@152
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236 // else if (state < 10) state -= 3;
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pascal@152
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237
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pascal@152
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238 cmpb $10-3, (BP, DI)
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pascal@152
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239
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pascal@152
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240 // else state -= 6;
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pascal@152
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241
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pascal@152
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242 jnb lzd6z
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pascal@152
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243 cmpb $7-3-1, (BP, DI)
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pascal@152
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244 jbe lzd3
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pascal@152
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245
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pascal@152
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246 // int matchByte = outStream[nowPos - rep0];
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pascal@152
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247
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pascal@152
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248 call DicoRep02ESDI // %bl = outStream[nowPos - rep0];
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pascal@152
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249
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pascal@152
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250 // do {
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pascal@152
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251 // int bit;
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pascal@152
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252 // CProb *probLit;
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pascal@152
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253 // matchByte <<= 1; bit = (matchByte & 0x100);
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pascal@152
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254
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pascal@152
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255 movb $1, %bh
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pascal@152
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256 lzd4:
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pascal@152
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257 shlb $1, %bl // matchByte <<= 1
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pascal@152
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258 sbb DI, DI // save bit=C
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pascal@152
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259
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pascal@152
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260 // probLit = prob + 0x100 + bit + symbol;
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pascal@152
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261
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pascal@152
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262 mov CX, AX // restore prob
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pascal@152
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263 adcb %bh, %ah // + bit + 0x100
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pascal@152
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264
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pascal@152
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265 // RC_GET_BIT2(probLit, symbol, if (bit) break, if (!bit) break)
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pascal@152
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266
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pascal@152
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267 call Bit1axdx // C,%ax = Bit1(prob+%ax)
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pascal@152
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268 rclb $1, %dl // symbol <<= 1; symbol |= C
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pascal@152
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269 jc lzd5 // if symbol >= 0x100
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pascal@152
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270 cmp DI, AX
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pascal@152
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271 jz lzd4 // if bit == Bit1(prob+%ax)
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pascal@152
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272
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pascal@152
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273 // } while (symbol < 0x100);
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pascal@152
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274 // }
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pascal@152
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275 lzd3:
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pascal@152
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276 // while (symbol < 0x100) {
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pascal@152
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277 // CProb *probLit = prob + symbol;
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pascal@152
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278 // RC_GET_BIT(probLit, symbol)
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pascal@152
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279 // }
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pascal@152
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280
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pascal@152
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281 xor BX, BX
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pascal@152
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282 jmp lzd4
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pascal@152
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283 lzd5:
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pascal@152
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284
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pascal@152
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285 // outStream[nowPos++] = previousByte = (Byte)symbol;
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pascal@152
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286
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pascal@152
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287 xchg AX, DX
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pascal@152
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288 call outchar // %bl = outStream[nowPos++] = %al;
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pascal@152
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289 jmp lzdmainlp
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pascal@152
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290
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pascal@152
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291 // }
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pascal@152
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292
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pascal@152
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293 lzdstring:
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pascal@152
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294 mov $1, CX
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pascal@152
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295
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pascal@152
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296 // else { /* string */
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pascal@152
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297 // prob = p + IsRep /*192*/ + state;
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pascal@152
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298
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pascal@152
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299 movb $192, %dl
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pascal@152
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300 addb (BP, DI), %dl
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pascal@152
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301 mov $rep0, DI
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pascal@152
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302
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pascal@152
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303 // if (Bit0(prob)) {
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pascal@152
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304
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pascal@152
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305 call Bit1dx // Bit1(prob)
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pascal@152
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306 jc lzd8
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pascal@152
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307
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pascal@152
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308 // rep3 = rep2; rep2 = rep1; rep1 = rep0;
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pascal@152
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309 // state = (state < kNumLitStates /*7*/) ? 0 : 3;
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pascal@152
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310
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pascal@152
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311 stc
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pascal@152
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312
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pascal@152
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313 // prob = p + LenCoder /*818*/;
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pascal@152
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314
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pascal@152
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315 mov $818, DX
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pascal@152
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316
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pascal@152
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317 // }
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pascal@152
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318
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pascal@152
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319 jmp lzd11a
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pascal@152
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320
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pascal@152
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321 // else {
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pascal@152
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322 lzd8:
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pascal@152
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323 // prob += kNumStates /*12*/;
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pascal@152
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324 // if (Bit0(prob)) {
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pascal@152
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325 call Bit1dx12 // prob += 12; Bit1(prob)
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pascal@152
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326 jc lzd11
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pascal@152
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327 // prob = p + IsRep0Long /*240*/ + (state << kNumPosBitsMax /*4*/)
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pascal@152
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328 // + posState;
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pascal@152
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329 movb $240, %dl // dh=0
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pascal@152
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330
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pascal@152
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331 // if (Bit0(prob)) {
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pascal@152
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332
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pascal@152
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333 call Bit1state // Bit1(dx + (state << kNumPosBitsMax /*4*/) + posState)
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pascal@152
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334 jc lzd12
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pascal@152
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335
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pascal@152
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336 // // if (nowPos == 0) return LZMA_RESULT_DATA_ERROR;
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pascal@152
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337 // state = (state < kNumLitStates /*7*/) ? 9 : 11;
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pascal@152
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338
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pascal@152
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339 movb $9, %dl
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pascal@152
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340
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pascal@152
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341 // len++; goto string;
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pascal@152
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342 jmp lzd13string // ax = 0
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pascal@152
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343 // }
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pascal@152
|
344 // }
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pascal@152
|
345 // else {
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pascal@152
|
346 lzd11:
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pascal@152
|
347 // UInt32 distance = rep1;
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pascal@152
|
348 // prob += kNumStates /*12*/;
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pascal@152
|
349 // if (!Bit0(prob)) {
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pascal@152
|
350
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pascal@152
|
351 call Bit1dx12 // prob += 12; Bit1(prob)
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pascal@152
|
352 jnc lzd11z
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pascal@152
|
353
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pascal@152
|
354 // prob += kNumStates /*12*/;
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pascal@152
|
355 // if (Bit0(prob)) distance = rep2;
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pascal@152
|
356
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pascal@152
|
357 call Bit1dx12 // prob += 12; Bit1(prob)
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pascal@152
|
358 lzd11a:
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pascal@152
|
359 adcb %cl, %cl
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pascal@152
|
360
|
pascal@152
|
361 // else { distance = rep3; rep3 = rep2; }
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pascal@152
|
362 // rep2 = rep1;
|
pascal@152
|
363 // }
|
pascal@152
|
364 // rep1 = rep0; rep0 = distance;
|
pascal@152
|
365
|
pascal@152
|
366 lzd11z:
|
pascal@152
|
367 # ifdef ONLY8086
|
pascal@152
|
368 shl $1, CX
|
pascal@152
|
369 shl $1, CX // 8->32 bits
|
pascal@152
|
370 sub CX, DI // &rep[cx]
|
pascal@152
|
371 movw (BP, DI), %ax
|
pascal@152
|
372 pushw 2(BP, DI)
|
pascal@152
|
373 rotreplp:
|
pascal@152
|
374 movb 4(BP, DI), %bl
|
pascal@152
|
375 movb %bl, (BP, DI)
|
pascal@152
|
376 inc DI
|
pascal@152
|
377 loop rotreplp
|
pascal@152
|
378 popw %bx
|
pascal@152
|
379 testb %dh, %dh
|
pascal@152
|
380 jnz lzd10
|
pascal@152
|
381 movw %ax, (BP, DI)
|
pascal@152
|
382 movw %bx, 2(BP, DI)
|
pascal@152
|
383 # else
|
pascal@152
|
384 shl $2, CX // 8->32 bits
|
pascal@152
|
385 sub CX, DI // &rep[cx]
|
pascal@152
|
386 movl (BP, DI), %eax
|
pascal@152
|
387 rotreplp:
|
pascal@152
|
388 movb 4(BP, DI), %bl
|
pascal@152
|
389 movb %bl, (BP, DI)
|
pascal@152
|
390 inc DI
|
pascal@152
|
391 loop rotreplp
|
pascal@152
|
392 testb %dh, %dh
|
pascal@152
|
393 jnz lzd10
|
pascal@152
|
394 movl %eax, (BP, DI)
|
pascal@152
|
395 # endif
|
pascal@152
|
396
|
pascal@152
|
397 // }
|
pascal@152
|
398 lzd12:
|
pascal@152
|
399 // state = (state < kNumLitStates /*7*/) ? 8 : 11;
|
pascal@152
|
400
|
pascal@152
|
401 movb $0x08, %cl
|
pascal@152
|
402
|
pascal@152
|
403 // prob = p + RepLenCoder /*1332*/;
|
pascal@152
|
404
|
pascal@152
|
405 mov $1332, DX
|
pascal@152
|
406
|
pascal@152
|
407 // }
|
pascal@152
|
408 lzd10:
|
pascal@152
|
409 push CX // CX = 0
|
pascal@152
|
410
|
pascal@152
|
411 // { /* get len */
|
pascal@152
|
412 // int numBits, offset;
|
pascal@152
|
413 // CProb *probLen = prob + LenChoice /*0*/;
|
pascal@152
|
414 // numBits = kLenNumLowBits /*3*/;
|
pascal@152
|
415
|
pascal@152
|
416 movb $8, %cl // numBits : 3,3,8
|
pascal@152
|
417
|
pascal@152
|
418 // if (Bit0(probLen)) {
|
pascal@152
|
419
|
pascal@152
|
420 call Bit1dx // Bit1(prob)
|
pascal@152
|
421 xchg AX, BX
|
pascal@152
|
422 inc DX
|
pascal@152
|
423 jnc lzd15 // bx=0
|
pascal@152
|
424
|
pascal@152
|
425 // probLen = prob + LenLow/*2*/ + (posState << kLenNumLowBits/*3*/);
|
pascal@152
|
426 // offset = 0;
|
pascal@152
|
427 // }
|
pascal@152
|
428 // else {
|
pascal@152
|
429 // probLen = prob + LenChoice2 /*1*/;
|
pascal@152
|
430
|
pascal@152
|
431 call Bit1dx // Bit1(prob)
|
pascal@152
|
432 add AX, BX
|
pascal@152
|
433
|
pascal@152
|
434 #if PROP_PB != 0
|
pascal@152
|
435 inc AX // ah=0
|
pascal@152
|
436 #endif
|
pascal@152
|
437 jc lzd16 // %ax=0, %bx=-2
|
pascal@152
|
438 lzd15:
|
pascal@152
|
439 #if PROP_PB != 0
|
pascal@152
|
440 movb $8, %al
|
pascal@152
|
441 mulb posState(BP)
|
pascal@152
|
442 #endif
|
pascal@152
|
443
|
pascal@152
|
444 // if (Bit0(probLen)) {
|
pascal@152
|
445 // probLen = prob + LenMid/*130*/ + (posState << kLenNumMidBits/*3*/);
|
pascal@152
|
446
|
pascal@152
|
447 movb $3, %cl // numBits : 3,3,8
|
pascal@152
|
448 lzd16:
|
pascal@152
|
449 #if PROP_PB != 0
|
pascal@152
|
450 add $2-128-1, AX // probLen : 2,130,258
|
pascal@152
|
451 #else
|
pascal@152
|
452 mov $2-128-1, AX // probLen : 2,130,258
|
pascal@152
|
453 #endif
|
pascal@152
|
454 add DX, AX
|
pascal@152
|
455 mov $-8+1, DX // offset : 0,8,16
|
pascal@152
|
456 lzdargslp:
|
pascal@152
|
457 add $8, DX
|
pascal@152
|
458 add $128, AX
|
pascal@152
|
459 inc BX
|
pascal@152
|
460 jle lzdargslp // leave with bx=1
|
pascal@152
|
461
|
pascal@152
|
462 // offset = kLenNumLowSymbols /*8*/;
|
pascal@152
|
463 // //numBits = kLenNumMidBits /*3*/;
|
pascal@152
|
464 // }
|
pascal@152
|
465 // else {
|
pascal@152
|
466 // probLen = prob + LenHigh /*258*/;
|
pascal@152
|
467 // offset = kLenNumLowSymbols /*8*/ + kLenNumMidSymbols /*8*/;
|
pascal@152
|
468 // numBits = kLenNumHighBits /*8*/;
|
pascal@152
|
469 // }
|
pascal@152
|
470 // }
|
pascal@152
|
471 // RangeDecoderBitTreeDecode(probLen, numBits, len); len += offset;
|
pascal@152
|
472
|
pascal@152
|
473 push DX
|
pascal@152
|
474 call RangeDecoder // %ax=probs, %cx=numLevels, %ax=res
|
pascal@152
|
475 pop DX
|
pascal@152
|
476 add DX, AX // offset
|
pascal@152
|
477 pop DX // 0
|
pascal@152
|
478 lzd13string:
|
pascal@152
|
479 push AX
|
pascal@152
|
480
|
pascal@152
|
481 // state = (state < kNumLitStates /*7*/) ? dl : dl|3;
|
pascal@152
|
482
|
pascal@152
|
483 movb $7, %cl
|
pascal@152
|
484 cmpb %cl, state(BP)
|
pascal@152
|
485 jb new_state
|
pascal@152
|
486 orb $3, %dl
|
pascal@152
|
487 new_state:
|
pascal@152
|
488 movb %dl, state(BP)
|
pascal@152
|
489
|
pascal@152
|
490 // } /* get len */
|
pascal@152
|
491 // if (state < 4) {
|
pascal@152
|
492
|
pascal@152
|
493 cmpb $4-1, %dl
|
pascal@152
|
494 ja lzd19
|
pascal@152
|
495
|
pascal@152
|
496 // int posSlot;
|
pascal@152
|
497 // state += kNumLitStates /*7*/;
|
pascal@152
|
498
|
pascal@152
|
499 addb %cl, state(BP)
|
pascal@152
|
500
|
pascal@152
|
501 // prob = p + PosSlot /*432*/ + (((len < kNumLenToPosStates /*4*/) ?
|
pascal@152
|
502 // len : kNumLenToPosStates - 1) << kNumPosSlotBits /*6*/);
|
pascal@152
|
503
|
pascal@152
|
504 cmp $4+1, AX
|
pascal@152
|
505 jb lzd21
|
pascal@152
|
506 mov $3+1, AX
|
pascal@152
|
507
|
pascal@152
|
508 lzd21:
|
pascal@152
|
509
|
pascal@152
|
510 dec CX // cx = 6
|
pascal@152
|
511 shl %cl, AX
|
pascal@152
|
512 add $432-64, AX
|
pascal@152
|
513
|
pascal@152
|
514 // RangeDecoderBitTreeDecode(prob, kNumPosSlotBits /*6*/, posSlot);
|
pascal@152
|
515
|
pascal@152
|
516 call RangeDecoder // %ax=probs, %cx=numLevels, %ax=res
|
pascal@152
|
517
|
pascal@152
|
518 // if (posSlot >= kStartPosModelIndex /*4*/) {
|
pascal@152
|
519 // int numDirectBits = ((posSlot >> 1) - 1);
|
pascal@152
|
520
|
pascal@152
|
521 #ifndef FLAT32
|
pascal@152
|
522 movw %cx, 2(%bp, %di) // %cx = 0
|
pascal@152
|
523 #endif
|
pascal@152
|
524 mov AX, (BP, DI)
|
pascal@152
|
525 mov AX, CX
|
pascal@152
|
526 shrw $1, CX
|
pascal@152
|
527 dec CX
|
pascal@152
|
528 cmpb $4, %al
|
pascal@152
|
529 jb lzd22
|
pascal@152
|
530
|
pascal@152
|
531 // rep0 = (2 | ((UInt32)posSlot & 1));
|
pascal@152
|
532
|
pascal@152
|
533 andb %bl, (BP, DI) // %bx=1
|
pascal@152
|
534 orb $2, (BP, DI)
|
pascal@152
|
535
|
pascal@152
|
536 // if (posSlot < kEndPosModelIndex /*14*/) {
|
pascal@152
|
537
|
pascal@152
|
538 cmpb $14, %al
|
pascal@152
|
539 jnb lzd23
|
pascal@152
|
540
|
pascal@152
|
541 // rep0 <<= numDirectBits;
|
pascal@152
|
542
|
pascal@152
|
543 neg AX
|
pascal@152
|
544 # ifdef ONLY8086
|
pascal@152
|
545 pushw %cx
|
pascal@152
|
546 movb $0, %ch
|
pascal@152
|
547 shllrep0:
|
pascal@152
|
548 shlw $1, (BP, DI)
|
pascal@152
|
549 rclw $1, 2(BP, DI)
|
pascal@152
|
550 loop shllrep0
|
pascal@152
|
551 popw %cx
|
pascal@152
|
552 # else
|
pascal@152
|
553 shll %cl, (BP, DI)
|
pascal@152
|
554 # endif
|
pascal@152
|
555 add (BP, DI), AX
|
pascal@152
|
556
|
pascal@152
|
557 // prob = p + SpecPos /*688*/ + rep0 - posSlot - 1;
|
pascal@152
|
558
|
pascal@152
|
559 add $687, AX
|
pascal@152
|
560 jmp lzd24
|
pascal@152
|
561
|
pascal@152
|
562 // }
|
pascal@152
|
563 // else {
|
pascal@152
|
564 lzd23:
|
pascal@152
|
565 // numDirectBits -= kNumAlignBits /*4*/;
|
pascal@152
|
566 // do {
|
pascal@152
|
567 // RC_NORMALIZE; Range >>= 1; rep0 <<= 1;
|
pascal@152
|
568 // if (Code >= Range) { Code -= Range; rep0 |= 1; }
|
pascal@152
|
569
|
pascal@152
|
570 lzd23z:
|
pascal@152
|
571 call RC_NORMALIZE
|
pascal@152
|
572 # ifdef ONLY8086
|
pascal@152
|
573 pushw %dx
|
pascal@152
|
574 shrw $1, Range+2(BP)
|
pascal@152
|
575 rcrw $1, Range(BP)
|
pascal@152
|
576 movw Range(BP), %ax
|
pascal@152
|
577 movw Range+2(BP), %dx
|
pascal@152
|
578 cmpw Code+2(BP), %dx
|
pascal@152
|
579 ja lzd25
|
pascal@152
|
580 jb lzd25x
|
pascal@152
|
581 cmpw Code(BP), %ax
|
pascal@152
|
582 ja lzd25
|
pascal@152
|
583 lzd25x:
|
pascal@152
|
584 subw %ax, Code(BP)
|
pascal@152
|
585 sbbw %dx, Code+2(BP)
|
pascal@152
|
586 stc
|
pascal@152
|
587 lzd25:
|
pascal@152
|
588 popw %dx
|
pascal@152
|
589 rclw $1, (BP, DI)
|
pascal@152
|
590 rclw $1, 2(BP, DI)
|
pascal@152
|
591 # else
|
pascal@152
|
592 shrl $1, Range(BP)
|
pascal@152
|
593 movl Range(BP), %eax
|
pascal@152
|
594 cmpl Code(BP), %eax
|
pascal@152
|
595 ja lzd25
|
pascal@152
|
596 subl %eax, Code(BP)
|
pascal@152
|
597 stc
|
pascal@152
|
598 lzd25:
|
pascal@152
|
599 rcll $1, (BP, DI)
|
pascal@152
|
600 # endif
|
pascal@152
|
601
|
pascal@152
|
602 // } while (--numDirectBits != 0);
|
pascal@152
|
603
|
pascal@152
|
604 cmpb $4+1, %cl
|
pascal@152
|
605 loopne lzd23z
|
pascal@152
|
606
|
pascal@152
|
607 // prob = p + Align /* 802 */; numDirectBits = kNumAlignBits /*4*/;
|
pascal@152
|
608 // rep0 <<= numDirectBits;
|
pascal@152
|
609
|
pascal@152
|
610 # ifdef ONLY8086
|
pascal@152
|
611 pushw %cx
|
pascal@152
|
612 movb $0, %ch
|
pascal@152
|
613 shlrep0:
|
pascal@152
|
614 shlw $1, (BP, DI)
|
pascal@152
|
615 rclw $1, 2(BP, DI)
|
pascal@152
|
616 loop shlrep0
|
pascal@152
|
617 popw %cx
|
pascal@152
|
618 # else
|
pascal@152
|
619 shll %cl, (BP, DI)
|
pascal@152
|
620 # endif
|
pascal@152
|
621 mov $802, AX
|
pascal@152
|
622 // }
|
pascal@152
|
623
|
pascal@152
|
624 lzd24:
|
pascal@152
|
625 call RangeDecoder // %ax=probs, %cx=numLevels, %ax=res
|
pascal@152
|
626
|
pascal@152
|
627 // {
|
pascal@152
|
628 // int i = 1, mi = 1;
|
pascal@152
|
629 // do {
|
pascal@152
|
630 // CProb *prob3 = prob + mi;
|
pascal@152
|
631 // RC_GET_BIT2(prob3, mi, ; , rep0 |= i);
|
pascal@152
|
632
|
pascal@152
|
633 orb %dh, (BP, DI) // update rep0 with DirectBits
|
pascal@152
|
634
|
pascal@152
|
635 // i <<= 1;
|
pascal@152
|
636 // } while(--numDirectBits != 0);
|
pascal@152
|
637 // }
|
pascal@152
|
638 // } else rep0 = posSlot;
|
pascal@152
|
639 lzd22:
|
pascal@152
|
640 // if (++rep0 == (UInt32)(0)) break; /* EOF */
|
pascal@152
|
641
|
pascal@152
|
642 # ifdef ONLY8086
|
pascal@152
|
643 incw (BP, DI)
|
pascal@152
|
644 jnz lzd19
|
pascal@152
|
645 incw 2(BP, DI)
|
pascal@152
|
646 # else
|
pascal@152
|
647 incl (BP, DI)
|
pascal@152
|
648 # endif
|
pascal@152
|
649
|
pascal@152
|
650 lzd19:
|
pascal@152
|
651 pop CX
|
pascal@152
|
652 jz lzdone
|
pascal@152
|
653
|
pascal@152
|
654 // }
|
pascal@152
|
655 // len += kMatchMinLen;/*2*/
|
pascal@152
|
656
|
pascal@152
|
657 inc CX
|
pascal@152
|
658
|
pascal@152
|
659 // string: // if (rep0 > nowPos) return LZMA_RESULT_DATA_ERROR;
|
pascal@152
|
660 // do {
|
pascal@152
|
661 lzd13z:
|
pascal@152
|
662 // previousByte = outStream[nowPos - rep0];
|
pascal@152
|
663 // outStream[nowPos++] = previousByte;
|
pascal@152
|
664
|
pascal@152
|
665 call outcharDico // %bl = outStream[nowPos++] = outStream[nowPos - rep0]
|
pascal@152
|
666
|
pascal@152
|
667 // } while(--len != 0);
|
pascal@152
|
668
|
pascal@152
|
669 loop lzd13z
|
pascal@152
|
670
|
pascal@152
|
671 // } /* char/string */
|
pascal@152
|
672 // }
|
pascal@152
|
673
|
pascal@152
|
674 jmp lzdmainlp
|
pascal@152
|
675
|
pascal@152
|
676 lzdone:
|
pascal@152
|
677 // //RC_NORMALIZE;
|
pascal@152
|
678 // //*inSizeProcessed = (SizeT)(Buffer - inStream); *outSizeProcessed = nowPos;
|
pascal@152
|
679 // return LZMA_RESULT_OK;
|
pascal@152
|
680 call Dico2ESDI // set es & di (rep0 = 0)
|
pascal@152
|
681 lea ws2(BP), SP // dealloc
|
pascal@152
|
682 ret
|
pascal@152
|
683 // }
|
pascal@152
|
684
|
pascal@152
|
685 // al = outStream[nowPos - rep0];
|
pascal@152
|
686
|
pascal@152
|
687 /*
|
pascal@152
|
688 * output es:di, al
|
pascal@152
|
689 * scratch bh, cl, flags
|
pascal@152
|
690 */
|
pascal@152
|
691
|
pascal@152
|
692 DicoRep02ESDI:
|
pascal@152
|
693 stc
|
pascal@152
|
694
|
pascal@152
|
695 // bl = outStream[nowPos];
|
pascal@152
|
696
|
pascal@152
|
697 /*
|
pascal@152
|
698 * output es:di, bl
|
pascal@152
|
699 * scratch bh, cl, flags
|
pascal@152
|
700 */
|
pascal@152
|
701
|
pascal@152
|
702 Dico2ESDI:
|
pascal@152
|
703 #if !defined(FLAT32) && !defined(FLAT16OUT)
|
pascal@152
|
704 # ifdef ONLY8086
|
pascal@152
|
705 pushw %ax
|
pascal@152
|
706 movw nowPos(%bp), %bx
|
pascal@152
|
707 movw nowPos+2(%bp), %ax
|
pascal@152
|
708 jnc Dico2ESDIz
|
pascal@152
|
709 subw rep0(%bp), %bx
|
pascal@152
|
710 sbbw rep0+2(%bp), %ax
|
pascal@152
|
711 Dico2ESDIz:
|
pascal@152
|
712 movw $0xF, %di
|
pascal@152
|
713 andw %bx, %di
|
pascal@152
|
714 pushw %cx
|
pascal@152
|
715 movb $4, %cl
|
pascal@152
|
716 shrw %cl, %bx
|
pascal@152
|
717 shlw %cl, %ax
|
pascal@152
|
718 popw %cx
|
pascal@152
|
719 addb %al, %bh
|
pascal@152
|
720 popw %ax
|
pascal@152
|
721 # else
|
pascal@152
|
722 movl nowPos(%bp), %ebx
|
pascal@152
|
723 jnc Dico2ESDIz
|
pascal@152
|
724 subl rep0(%bp), %ebx
|
pascal@152
|
725 Dico2ESDIz:
|
pascal@152
|
726 movw %bx, %di
|
pascal@152
|
727 xorw %bx, %bx
|
pascal@152
|
728 shrl $4, %ebx
|
pascal@152
|
729 # endif
|
pascal@152
|
730 movw %bx, %es
|
pascal@152
|
731 #else
|
pascal@152
|
732 mov nowPos(BP), DI
|
pascal@152
|
733 jnc Dico2ESDIz
|
pascal@152
|
734 sub rep0(BP), DI
|
pascal@152
|
735 Dico2ESDIz:
|
pascal@152
|
736 #endif
|
pascal@152
|
737 #ifdef FLAT32
|
pascal@152
|
738 movb (DI), %bl
|
pascal@152
|
739 #else
|
pascal@152
|
740 movb %es:(%di), %bl
|
pascal@152
|
741 #endif
|
pascal@152
|
742 ret
|
pascal@152
|
743
|
pascal@152
|
744 outcharDico:
|
pascal@152
|
745
|
pascal@152
|
746 // bl = outStream[nowPos++] = outStream[nowPos - rep0]
|
pascal@152
|
747
|
pascal@152
|
748 /*
|
pascal@152
|
749 * output es:di, bl
|
pascal@152
|
750 * update nowPos
|
pascal@152
|
751 * scratch ax, dx, bh, cl, flags
|
pascal@152
|
752 */
|
pascal@152
|
753
|
pascal@152
|
754 call DicoRep02ESDI // %bl = outStream[nowPos - rep0]
|
pascal@152
|
755 xchg AX, BX
|
pascal@152
|
756 outchar:
|
pascal@152
|
757
|
pascal@152
|
758 // bl = outStream[nowPos++] = previousByte = al;
|
pascal@152
|
759
|
pascal@152
|
760 /*
|
pascal@152
|
761 * output bl
|
pascal@152
|
762 * update nowPos
|
pascal@152
|
763 * scratch ax, dx, bh, di, cl, flags
|
pascal@152
|
764 */
|
pascal@152
|
765
|
pascal@152
|
766 clc
|
pascal@152
|
767 call Dico2ESDI
|
pascal@152
|
768 stosb
|
pascal@152
|
769 xchg AX, BX // previous byte
|
pascal@152
|
770
|
pascal@152
|
771 // int posState = (int)((nowPos) & posStateMask);
|
pascal@152
|
772
|
pascal@152
|
773 #if PROP_PB != 0 && PROP_LP != 0
|
pascal@152
|
774 addw $0x0101, posState2(BP)
|
pascal@152
|
775 andb $(((1 << PROP_PB) -1)<<8)+((1 << PROP_LP) -1), posState2(BP)
|
pascal@152
|
776 #else
|
pascal@152
|
777 # if PROP_PB != 0
|
pascal@152
|
778 incb posState(BP)
|
pascal@152
|
779 andb $((1 << PROP_PB) -1), posState(BP)
|
pascal@152
|
780 # endif
|
pascal@152
|
781 # if PROP_LP != 0
|
pascal@152
|
782 incb posState2(BP)
|
pascal@152
|
783 andb $((1 << PROP_LP) -1), posState2(BP)
|
pascal@152
|
784 # endif
|
pascal@152
|
785 #endif
|
pascal@152
|
786 #ifdef ONLY8086
|
pascal@152
|
787 incw nowPos(BP)
|
pascal@152
|
788 jnz incnowPosDone
|
pascal@152
|
789 incw nowPos+2(BP)
|
pascal@152
|
790 incnowPosDone:
|
pascal@152
|
791 #else
|
pascal@152
|
792 incl nowPos(BP)
|
pascal@152
|
793 #endif
|
pascal@152
|
794 ret
|
pascal@152
|
795
|
pascal@152
|
796 //
|
pascal@152
|
797 // #define RC_NORMALIZE if (Range < kTopValue)
|
pascal@152
|
798 // { Range <<= 8; Code = (Code << 8) | RC_READ_BYTE; }
|
pascal@152
|
799
|
pascal@152
|
800 /*
|
pascal@152
|
801 * update Range, Code, ds:si
|
pascal@152
|
802 * scratch flags
|
pascal@152
|
803 */
|
pascal@152
|
804
|
pascal@152
|
805 RC_NORMALIZE:
|
pascal@152
|
806 cmpb $0, Range+3(BP)
|
pascal@152
|
807 jne RC_NORMALIZE_1
|
pascal@152
|
808 RC_LOAD_BYTE:
|
pascal@152
|
809 push AX
|
pascal@152
|
810 #ifdef ONLY8086
|
pascal@152
|
811 movw Range+1(BP), %ax
|
pascal@152
|
812 movw %ax, Range+2(BP)
|
pascal@152
|
813 movw Code+1(BP), %ax
|
pascal@152
|
814 movw %ax, Code+2(BP)
|
pascal@152
|
815 xorw %ax, %ax
|
pascal@152
|
816 movb Range(BP), %ah
|
pascal@152
|
817 movw %ax, Range(BP)
|
pascal@152
|
818 movb Code(BP), %ah
|
pascal@152
|
819 movw %ax, Code(BP)
|
pascal@152
|
820 #else
|
pascal@152
|
821 shll $8, Range(BP)
|
pascal@152
|
822 shll $8, Code(BP)
|
pascal@152
|
823 #endif
|
pascal@152
|
824 #if !defined(FLAT16) && !defined(FLAT32)
|
pascal@152
|
825 testw %si, %si
|
pascal@152
|
826 jns RC_READ_BYTE
|
pascal@152
|
827 movw %ds, %ax
|
pascal@152
|
828 incw %ax
|
pascal@152
|
829 movw %ax, %ds
|
pascal@152
|
830 addw $-16, %si
|
pascal@152
|
831 RC_READ_BYTE:
|
pascal@152
|
832 #endif
|
pascal@152
|
833 lodsb
|
pascal@152
|
834 movb %al, Code(BP)
|
pascal@152
|
835 pop AX
|
pascal@152
|
836 RC_NORMALIZE_1:
|
pascal@152
|
837 ret
|
pascal@152
|
838
|
pascal@152
|
839 // Bit1(dx + (state << kNumPosBitsMax /*4*/) + posState)
|
pascal@152
|
840
|
pascal@152
|
841 Bit1state:
|
pascal@152
|
842 movb $16, %al
|
pascal@152
|
843 mulb state(BP)
|
pascal@152
|
844 # if PROP_PB != 0
|
pascal@152
|
845 addb posState(BP), %al
|
pascal@152
|
846 # endif
|
pascal@152
|
847 Bit1axdx:
|
pascal@152
|
848 add DX, AX
|
pascal@152
|
849 jmp Bit1
|
pascal@152
|
850
|
pascal@152
|
851 // prob += 12; Bit1(prob)
|
pascal@152
|
852
|
pascal@152
|
853 Bit1dx12:
|
pascal@152
|
854 add $12, DX
|
pascal@152
|
855 Bit1dx:
|
pascal@152
|
856 mov DX, AX
|
pascal@152
|
857
|
pascal@152
|
858 // static int Bit1(CProb *p)
|
pascal@152
|
859
|
pascal@152
|
860 Bit1:
|
pascal@152
|
861 /*
|
pascal@152
|
862 * input ax=p
|
pascal@152
|
863 * output C, ax
|
pascal@152
|
864 * update bound, Range, Code, ds:si
|
pascal@152
|
865 * scratch flags
|
pascal@152
|
866 */
|
pascal@152
|
867
|
pascal@152
|
868 // {
|
pascal@152
|
869 // RC_NORMALIZE;
|
pascal@152
|
870
|
pascal@152
|
871 call RC_NORMALIZE // kill %ax, update %si
|
pascal@152
|
872
|
pascal@152
|
873 #ifdef ONLY8086
|
pascal@152
|
874 pushw %ax
|
pascal@152
|
875 pushw %cx
|
pascal@152
|
876 pushw %dx
|
pascal@152
|
877 pushw %di
|
pascal@152
|
878 #else
|
pascal@152
|
879 pushal
|
pascal@152
|
880 #endif
|
pascal@152
|
881
|
pascal@152
|
882 xchg AX, DI
|
pascal@152
|
883 add DI, DI // short *
|
pascal@152
|
884
|
pascal@152
|
885
|
pascal@152
|
886 // bound = (Range>>kNumBitModelTotalBits /*11*/) * *(p);
|
pascal@152
|
887
|
pascal@152
|
888 #ifdef ONLY8086
|
pascal@152
|
889 movw Range(BP), %dx
|
pascal@152
|
890 movw Range+2(BP), %ax
|
pascal@152
|
891 movw $11, %cx
|
pascal@152
|
892 shr11lp:
|
pascal@152
|
893 shrw $1, %ax
|
pascal@152
|
894 rcrw $1, %dx
|
pascal@152
|
895 loop shr11lp
|
pascal@152
|
896 movw %dx, %cx
|
pascal@152
|
897 mulw (BP, DI)
|
pascal@152
|
898 xchgw %ax, %cx
|
pascal@152
|
899 mulw (BP, DI)
|
pascal@152
|
900 addw %cx, %dx
|
pascal@152
|
901 #else
|
pascal@152
|
902 movl Range(BP), %eax
|
pascal@152
|
903 shrl $11, %eax
|
pascal@152
|
904 movzwl (BP, DI), %edx
|
pascal@152
|
905 mull %edx
|
pascal@152
|
906 #endif
|
pascal@152
|
907
|
pascal@152
|
908 // if (Code < bound) {
|
pascal@152
|
909
|
pascal@152
|
910 #ifdef ONLY8086
|
pascal@152
|
911 cmpw Code+2(BP), %dx
|
pascal@152
|
912 jb Bit1_1
|
pascal@152
|
913 ja Bit1_1x
|
pascal@152
|
914 cmpw Code(BP), %ax
|
pascal@152
|
915 jbe Bit1_1
|
pascal@152
|
916 Bit1_1x:
|
pascal@152
|
917
|
pascal@152
|
918 // Range = bound;
|
pascal@152
|
919
|
pascal@152
|
920 movw %ax, Range(BP)
|
pascal@152
|
921 movw %dx, Range+2(BP)
|
pascal@152
|
922 #else
|
pascal@152
|
923 cmpl Code(BP), %eax
|
pascal@152
|
924 jbe Bit1_1
|
pascal@152
|
925
|
pascal@152
|
926 // Range = bound;
|
pascal@152
|
927
|
pascal@152
|
928 movl %eax, Range(BP)
|
pascal@152
|
929 #endif
|
pascal@152
|
930
|
pascal@152
|
931 // *(p) += (kBitModelTotal /*2048*/ - *(p)) >> kNumMoveBits /*5*/;
|
pascal@152
|
932
|
pascal@152
|
933 movw $2048, %ax
|
pascal@152
|
934
|
pascal@152
|
935 // return 0;
|
pascal@152
|
936
|
pascal@152
|
937 jmp Bit1_2
|
pascal@152
|
938
|
pascal@152
|
939 // }
|
pascal@152
|
940 // else {
|
pascal@152
|
941
|
pascal@152
|
942 Bit1_1:
|
pascal@152
|
943
|
pascal@152
|
944 // Range -= bound; Code -= bound;
|
pascal@152
|
945
|
pascal@152
|
946 #ifdef ONLY8086
|
pascal@152
|
947 subw %ax, Range(BP)
|
pascal@152
|
948 sbbw %dx, Range+2(BP)
|
pascal@152
|
949 subw %ax, Code(BP)
|
pascal@152
|
950 sbbw %dx, Code+2(BP)
|
pascal@152
|
951 #else
|
pascal@152
|
952 subl %eax, Range(BP)
|
pascal@152
|
953 subl %eax, Code(BP)
|
pascal@152
|
954 #endif
|
pascal@152
|
955
|
pascal@152
|
956 // *(p) -= (*(p)) >> kNumMoveBits /*5*/;
|
pascal@152
|
957
|
pascal@152
|
958 movw $31, %ax
|
pascal@152
|
959
|
pascal@152
|
960 // return 1;
|
pascal@152
|
961
|
pascal@152
|
962 stc
|
pascal@152
|
963 Bit1_2:
|
pascal@152
|
964 pushf
|
pascal@152
|
965 subw (BP, DI), %ax
|
pascal@152
|
966 #ifdef ONLY8086
|
pascal@152
|
967 movb $5, %cl
|
pascal@152
|
968 sarw %cl, %ax
|
pascal@152
|
969 #else
|
pascal@152
|
970 sarw $5, %ax
|
pascal@152
|
971 #endif
|
pascal@152
|
972 addw %ax, (BP, DI)
|
pascal@152
|
973 popf
|
pascal@152
|
974 #ifdef ONLY8086
|
pascal@152
|
975 popw %di
|
pascal@152
|
976 popw %dx
|
pascal@152
|
977 popw %cx
|
pascal@152
|
978 popw %ax
|
pascal@152
|
979 #else
|
pascal@152
|
980 popal
|
pascal@152
|
981 #endif
|
pascal@152
|
982 sbb AX, AX
|
pascal@152
|
983
|
pascal@152
|
984 // }
|
pascal@152
|
985 // }
|
pascal@152
|
986
|
pascal@152
|
987 ret
|
pascal@152
|
988
|
pascal@152
|
989 RangeDecoder:
|
pascal@152
|
990
|
pascal@152
|
991 /*
|
pascal@152
|
992 * input ax=probs cx=numLevels (< 8) bx=1
|
pascal@152
|
993 * output ax=res (backward), dh (forward)
|
pascal@152
|
994 * update bound, Range, Code, ds:si
|
pascal@152
|
995 * scratch flags, cx=0, dl
|
pascal@152
|
996 */
|
pascal@152
|
997
|
pascal@152
|
998 push BX
|
pascal@152
|
999
|
pascal@152
|
1000 // { int i = numLevels; res = 1;
|
pascal@152
|
1001 mov BX, DX // res = 1
|
pascal@152
|
1002
|
pascal@152
|
1003 // do { CProb *p = probs + res; RC_GET_BIT(p, res) } while(--i != 0);
|
pascal@152
|
1004
|
pascal@152
|
1005 RangeDecoder_1:
|
pascal@152
|
1006 push AX
|
pascal@152
|
1007 call Bit1axdx // C,%ax = Bit1(prob+%ax)
|
pascal@152
|
1008 rclb $1, %dl // res <<= 1; res |= C
|
pascal@152
|
1009 andb %bl, %al // current bit
|
pascal@152
|
1010 orb %al, %bh // store in bh
|
pascal@152
|
1011 shlb $1, %bl // update max
|
pascal@152
|
1012 pop AX
|
pascal@152
|
1013 loop RangeDecoder_1
|
pascal@152
|
1014
|
pascal@152
|
1015 // res -= (1 << numLevels); }
|
pascal@152
|
1016
|
pascal@152
|
1017 xchg AX, BX // move bh to dh
|
pascal@152
|
1018 xchg AX, DX // and dl to al
|
pascal@152
|
1019 sub %dl, %al // sub max
|
pascal@152
|
1020 pop BX
|
pascal@152
|
1021 ret
|