misc/libphysfs/lzma/CPP/7zip/Compress/RangeCoder/RangeCoderBit.cpp
author nemo
Mon, 10 Apr 2017 12:06:43 -0400
changeset 12213 bb5522e88ab2
permissions -rw-r--r--
bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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// Compress/RangeCoder/RangeCoderBit.cpp
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#include "StdAfx.h"
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#include "RangeCoderBit.h"
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namespace NCompress {
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namespace NRangeCoder {
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UInt32 CPriceTables::ProbPrices[kBitModelTotal >> kNumMoveReducingBits];
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static CPriceTables g_PriceTables;
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CPriceTables::CPriceTables() { Init(); }
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void CPriceTables::Init()
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{
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  const int kNumBits = (kNumBitModelTotalBits - kNumMoveReducingBits);
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  for(int i = kNumBits - 1; i >= 0; i--)
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  {
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    UInt32 start = 1 << (kNumBits - i - 1);
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    UInt32 end = 1 << (kNumBits - i);
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    for (UInt32 j = start; j < end; j++)
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      ProbPrices[j] = (i << kNumBitPriceShiftBits) + 
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          (((end - j) << kNumBitPriceShiftBits) >> (kNumBits - i - 1));
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  }
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  /*
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  // simplest: bad solution
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  for(UInt32 i = 1; i < (kBitModelTotal >> kNumMoveReducingBits) - 1; i++)
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    ProbPrices[i] = kBitPrice;
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  */
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  /*
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  const double kDummyMultMid = (1.0 / kBitPrice) / 2;
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  const double kDummyMultMid = 0;
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  // float solution
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  double ln2 = log(double(2));
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  double lnAll = log(double(kBitModelTotal >> kNumMoveReducingBits));
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  for(UInt32 i = 1; i < (kBitModelTotal >> kNumMoveReducingBits) - 1; i++)
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    ProbPrices[i] = UInt32((fabs(lnAll - log(double(i))) / ln2 + kDummyMultMid) * kBitPrice);
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  */
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  /*
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  // experimental, slow, solution:
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  for(UInt32 i = 1; i < (kBitModelTotal >> kNumMoveReducingBits) - 1; i++)
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  {
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    const int kCyclesBits = 5;
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    const UInt32 kCycles = (1 << kCyclesBits);
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    UInt32 range = UInt32(-1);
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    UInt32 bitCount = 0;
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    for (UInt32 j = 0; j < kCycles; j++)
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    {
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      range >>= (kNumBitModelTotalBits - kNumMoveReducingBits);
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      range *= i;
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      while(range < (1 << 31))
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      {
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        range <<= 1;
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        bitCount++;
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      }
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    }
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    bitCount <<= kNumBitPriceShiftBits;
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    range -= (1 << 31);
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    for (int k = kNumBitPriceShiftBits - 1; k >= 0; k--)
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    {
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      range <<= 1;
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      if (range > (1 << 31))
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      {
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        bitCount += (1 << k);
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        range -= (1 << 31);
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      }
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    }
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    ProbPrices[i] = (bitCount 
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      // + (1 << (kCyclesBits - 1))
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      ) >> kCyclesBits;
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
diff changeset
    76
  }
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
diff changeset
    77
  */
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
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    78
}
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
diff changeset
    79
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
diff changeset
    80
}}