misc/libphysfs/lzma/CPP/7zip/Compress/RangeCoder/RangeCoderBit.h
author unc0rr
Thu, 11 Oct 2018 23:43:31 +0200
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- Fix insert() for strings in pas2c - Implement insert() for ansistrings
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// Compress/RangeCoder/RangeCoderBit.h
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#ifndef __COMPRESS_RANGECODER_BIT_H
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#define __COMPRESS_RANGECODER_BIT_H
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#include "RangeCoder.h"
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namespace NCompress {
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namespace NRangeCoder {
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const int kNumBitModelTotalBits  = 11;
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const UInt32 kBitModelTotal = (1 << kNumBitModelTotalBits);
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const int kNumMoveReducingBits = 2;
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const int kNumBitPriceShiftBits = 6;
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const UInt32 kBitPrice = 1 << kNumBitPriceShiftBits;
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class CPriceTables
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{
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public:
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  static UInt32 ProbPrices[kBitModelTotal >> kNumMoveReducingBits];
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  static void Init();
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  CPriceTables();
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};
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template <int numMoveBits>
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class CBitModel
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{
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public:
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  UInt32 Prob;
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  void UpdateModel(UInt32 symbol)
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  {
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    /*
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    Prob -= (Prob + ((symbol - 1) & ((1 << numMoveBits) - 1))) >> numMoveBits;
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    Prob += (1 - symbol) << (kNumBitModelTotalBits - numMoveBits);
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    */
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    if (symbol == 0)
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      Prob += (kBitModelTotal - Prob) >> numMoveBits;
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    else
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      Prob -= (Prob) >> numMoveBits;
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  }
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public:
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  void Init() { Prob = kBitModelTotal / 2; }
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};
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template <int numMoveBits>
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class CBitEncoder: public CBitModel<numMoveBits>
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{
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public:
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  void Encode(CEncoder *encoder, UInt32 symbol)
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  {
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    /*
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    encoder->EncodeBit(this->Prob, kNumBitModelTotalBits, symbol);
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    this->UpdateModel(symbol);
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    */
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    UInt32 newBound = (encoder->Range >> kNumBitModelTotalBits) * this->Prob;
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    if (symbol == 0)
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    {
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      encoder->Range = newBound;
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      this->Prob += (kBitModelTotal - this->Prob) >> numMoveBits;
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    }
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    else
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    {
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      encoder->Low += newBound;
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      encoder->Range -= newBound;
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      this->Prob -= (this->Prob) >> numMoveBits;
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    }
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    if (encoder->Range < kTopValue)
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    {
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      encoder->Range <<= 8;
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      encoder->ShiftLow();
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    }
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  }
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  UInt32 GetPrice(UInt32 symbol) const
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  {
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    return CPriceTables::ProbPrices[
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    78
      (((this->Prob - symbol) ^ ((-(int)symbol))) & (kBitModelTotal - 1)) >> kNumMoveReducingBits];
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    79
  }
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    80
  UInt32 GetPrice0() const { return CPriceTables::ProbPrices[this->Prob >> kNumMoveReducingBits]; }
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    81
  UInt32 GetPrice1() const { return CPriceTables::ProbPrices[(kBitModelTotal - this->Prob) >> kNumMoveReducingBits]; }
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    82
};
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    83
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    84
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    85
template <int numMoveBits>
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    86
class CBitDecoder: public CBitModel<numMoveBits>
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    87
{
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    88
public:
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    89
  UInt32 Decode(CDecoder *decoder)
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    90
  {
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    91
    UInt32 newBound = (decoder->Range >> kNumBitModelTotalBits) * this->Prob;
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    92
    if (decoder->Code < newBound)
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    93
    {
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    94
      decoder->Range = newBound;
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    95
      this->Prob += (kBitModelTotal - this->Prob) >> numMoveBits;
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    96
      if (decoder->Range < kTopValue)
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    97
      {
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    98
        decoder->Code = (decoder->Code << 8) | decoder->Stream.ReadByte();
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    99
        decoder->Range <<= 8;
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   100
      }
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   101
      return 0;
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   102
    }
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   103
    else
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   104
    {
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   105
      decoder->Range -= newBound;
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   106
      decoder->Code -= newBound;
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   107
      this->Prob -= (this->Prob) >> numMoveBits;
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   108
      if (decoder->Range < kTopValue)
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   109
      {
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   110
        decoder->Code = (decoder->Code << 8) | decoder->Stream.ReadByte();
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   111
        decoder->Range <<= 8;
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   112
      }
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   113
      return 1;
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   114
    }
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   115
  }
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   116
};
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   117
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   118
}}
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   119
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   120
#endif