6 namespace NCompress {
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9 const UInt32 kNumRepDistances = 4;
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11 const int kNumStates = 12;
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13 const Byte kLiteralNextStates[kNumStates] = {0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5};
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14 const Byte kMatchNextStates[kNumStates] = {7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10};
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15 const Byte kRepNextStates[kNumStates] = {8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11};
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16 const Byte kShortRepNextStates[kNumStates]= {9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11};
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22 void Init() { Index = 0; }
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23 void UpdateChar() { Index = kLiteralNextStates[Index]; }
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24 void UpdateMatch() { Index = kMatchNextStates[Index]; }
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25 void UpdateRep() { Index = kRepNextStates[Index]; }
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26 void UpdateShortRep() { Index = kShortRepNextStates[Index]; }
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27 bool IsCharState() const { return Index < 7; }
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30 const int kNumPosSlotBits = 6;
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31 const int kDicLogSizeMin = 0;
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32 const int kDicLogSizeMax = 32;
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33 const int kDistTableSizeMax = kDicLogSizeMax * 2;
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35 const UInt32 kNumLenToPosStates = 4;
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37 inline UInt32 GetLenToPosState(UInt32 len)
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40 if (len < kNumLenToPosStates)
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42 return kNumLenToPosStates - 1;
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47 const int kNumPosStatesBitsMax = 4;
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48 const UInt32 kNumPosStatesMax = (1 << kNumPosStatesBitsMax);
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50 const int kNumPosStatesBitsEncodingMax = 4;
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51 const UInt32 kNumPosStatesEncodingMax = (1 << kNumPosStatesBitsEncodingMax);
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53 const int kNumLowBits = 3;
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54 const int kNumMidBits = 3;
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55 const int kNumHighBits = 8;
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56 const UInt32 kNumLowSymbols = 1 << kNumLowBits;
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57 const UInt32 kNumMidSymbols = 1 << kNumMidBits;
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58 const UInt32 kNumSymbolsTotal = kNumLowSymbols + kNumMidSymbols + (1 << kNumHighBits);
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62 const UInt32 kMatchMinLen = 2;
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63 const UInt32 kMatchMaxLen = kMatchMinLen + NLength::kNumSymbolsTotal - 1;
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65 const int kNumAlignBits = 4;
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66 const UInt32 kAlignTableSize = 1 << kNumAlignBits;
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67 const UInt32 kAlignMask = (kAlignTableSize - 1);
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69 const UInt32 kStartPosModelIndex = 4;
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70 const UInt32 kEndPosModelIndex = 14;
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71 const UInt32 kNumPosModels = kEndPosModelIndex - kStartPosModelIndex;
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73 const UInt32 kNumFullDistances = 1 << (kEndPosModelIndex / 2);
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75 const int kNumLitPosStatesBitsEncodingMax = 4;
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76 const int kNumLitContextBitsMax = 8;
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78 const int kNumMoveBits = 5;
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