summaryrefslogtreecommitdiffstats
path: root/src/libs/7zip/win/CPP/7zip/Compress/RangeCoderBit.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/libs/7zip/win/CPP/7zip/Compress/RangeCoderBit.h')
-rw-r--r--src/libs/7zip/win/CPP/7zip/Compress/RangeCoderBit.h114
1 files changed, 0 insertions, 114 deletions
diff --git a/src/libs/7zip/win/CPP/7zip/Compress/RangeCoderBit.h b/src/libs/7zip/win/CPP/7zip/Compress/RangeCoderBit.h
deleted file mode 100644
index 0eddd5586..000000000
--- a/src/libs/7zip/win/CPP/7zip/Compress/RangeCoderBit.h
+++ /dev/null
@@ -1,114 +0,0 @@
-// Compress/RangeCoderBit.h
-// 2013-01-10 : Igor Pavlov : Public domain
-
-#ifndef __COMPRESS_RANGE_CODER_BIT_H
-#define __COMPRESS_RANGE_CODER_BIT_H
-
-#include "RangeCoder.h"
-
-namespace NCompress {
-namespace NRangeCoder {
-
-const unsigned kNumBitModelTotalBits = 11;
-const UInt32 kBitModelTotal = (1 << kNumBitModelTotalBits);
-
-const unsigned kNumMoveReducingBits = 4;
-
-const unsigned kNumBitPriceShiftBits = 4;
-const UInt32 kBitPrice = 1 << kNumBitPriceShiftBits;
-
-extern UInt32 ProbPrices[kBitModelTotal >> kNumMoveReducingBits];
-
-template <unsigned numMoveBits>
-class CBitModel
-{
-public:
- UInt32 Prob;
- void UpdateModel(UInt32 symbol)
- {
- /*
- Prob -= (Prob + ((symbol - 1) & ((1 << numMoveBits) - 1))) >> numMoveBits;
- Prob += (1 - symbol) << (kNumBitModelTotalBits - numMoveBits);
- */
- if (symbol == 0)
- Prob += (kBitModelTotal - Prob) >> numMoveBits;
- else
- Prob -= (Prob) >> numMoveBits;
- }
-public:
- void Init() { Prob = kBitModelTotal / 2; }
-};
-
-template <unsigned numMoveBits>
-class CBitEncoder: public CBitModel<numMoveBits>
-{
-public:
- void Encode(CEncoder *encoder, UInt32 symbol)
- {
- /*
- encoder->EncodeBit(this->Prob, kNumBitModelTotalBits, symbol);
- this->UpdateModel(symbol);
- */
- UInt32 newBound = (encoder->Range >> kNumBitModelTotalBits) * this->Prob;
- if (symbol == 0)
- {
- encoder->Range = newBound;
- this->Prob += (kBitModelTotal - this->Prob) >> numMoveBits;
- }
- else
- {
- encoder->Low += newBound;
- encoder->Range -= newBound;
- this->Prob -= (this->Prob) >> numMoveBits;
- }
- if (encoder->Range < kTopValue)
- {
- encoder->Range <<= 8;
- encoder->ShiftLow();
- }
- }
- UInt32 GetPrice(UInt32 symbol) const
- {
- return ProbPrices[(this->Prob ^ ((-(int)(Int32)symbol)) & (kBitModelTotal - 1)) >> kNumMoveReducingBits];
- }
- UInt32 GetPrice0() const { return ProbPrices[this->Prob >> kNumMoveReducingBits]; }
- UInt32 GetPrice1() const { return ProbPrices[(this->Prob ^ (kBitModelTotal - 1)) >> kNumMoveReducingBits]; }
-};
-
-
-template <unsigned numMoveBits>
-class CBitDecoder: public CBitModel<numMoveBits>
-{
-public:
- UInt32 Decode(CDecoder *decoder)
- {
- UInt32 newBound = (decoder->Range >> kNumBitModelTotalBits) * this->Prob;
- if (decoder->Code < newBound)
- {
- decoder->Range = newBound;
- this->Prob += (kBitModelTotal - this->Prob) >> numMoveBits;
- if (decoder->Range < kTopValue)
- {
- decoder->Code = (decoder->Code << 8) | decoder->Stream.ReadByte();
- decoder->Range <<= 8;
- }
- return 0;
- }
- else
- {
- decoder->Range -= newBound;
- decoder->Code -= newBound;
- this->Prob -= (this->Prob) >> numMoveBits;
- if (decoder->Range < kTopValue)
- {
- decoder->Code = (decoder->Code << 8) | decoder->Stream.ReadByte();
- decoder->Range <<= 8;
- }
- return 1;
- }
- }
-};
-
-}}
-
-#endif