diff options
Diffstat (limited to 'other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoder.h')
| -rw-r--r-- | other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoder.h | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoder.h b/other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoder.h deleted file mode 100644 index 9828bc4b9..000000000 --- a/other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoder.h +++ /dev/null @@ -1,205 +0,0 @@ -// Compress/RangeCoder/RangeCoder.h
-
-#ifndef __COMPRESS_RANGECODER_H
-#define __COMPRESS_RANGECODER_H
-
-#include "../../Common/InBuffer.h"
-#include "../../Common/OutBuffer.h"
-
-namespace NCompress {
-namespace NRangeCoder {
-
-const int kNumTopBits = 24;
-const UInt32 kTopValue = (1 << kNumTopBits);
-
-class CEncoder
-{
- UInt32 _cacheSize;
- Byte _cache;
-public:
- UInt64 Low;
- UInt32 Range;
- COutBuffer Stream;
- bool Create(UInt32 bufferSize) { return Stream.Create(bufferSize); }
-
- void SetStream(ISequentialOutStream *stream) { Stream.SetStream(stream); }
- void Init()
- {
- Stream.Init();
- Low = 0;
- Range = 0xFFFFFFFF;
- _cacheSize = 1;
- _cache = 0;
- }
-
- void FlushData()
- {
- // Low += 1;
- for(int i = 0; i < 5; i++)
- ShiftLow();
- }
-
- HRESULT FlushStream() { return Stream.Flush(); }
-
- void ReleaseStream() { Stream.ReleaseStream(); }
-
- void Encode(UInt32 start, UInt32 size, UInt32 total)
- {
- Low += start * (Range /= total);
- Range *= size;
- while (Range < kTopValue)
- {
- Range <<= 8;
- ShiftLow();
- }
- }
-
- void ShiftLow()
- {
- if ((UInt32)Low < (UInt32)0xFF000000 || (int)(Low >> 32) != 0)
- {
- Byte temp = _cache;
- do
- {
- Stream.WriteByte((Byte)(temp + (Byte)(Low >> 32)));
- temp = 0xFF;
- }
- while(--_cacheSize != 0);
- _cache = (Byte)((UInt32)Low >> 24);
- }
- _cacheSize++;
- Low = (UInt32)Low << 8;
- }
-
- void EncodeDirectBits(UInt32 value, int numTotalBits)
- {
- for (int i = numTotalBits - 1; i >= 0; i--)
- {
- Range >>= 1;
- if (((value >> i) & 1) == 1)
- Low += Range;
- if (Range < kTopValue)
- {
- Range <<= 8;
- ShiftLow();
- }
- }
- }
-
- void EncodeBit(UInt32 size0, UInt32 numTotalBits, UInt32 symbol)
- {
- UInt32 newBound = (Range >> numTotalBits) * size0;
- if (symbol == 0)
- Range = newBound;
- else
- {
- Low += newBound;
- Range -= newBound;
- }
- while (Range < kTopValue)
- {
- Range <<= 8;
- ShiftLow();
- }
- }
-
- UInt64 GetProcessedSize() { return Stream.GetProcessedSize() + _cacheSize + 4; }
-};
-
-class CDecoder
-{
-public:
- CInBuffer Stream;
- UInt32 Range;
- UInt32 Code;
- bool Create(UInt32 bufferSize) { return Stream.Create(bufferSize); }
-
- void Normalize()
- {
- while (Range < kTopValue)
- {
- Code = (Code << 8) | Stream.ReadByte();
- Range <<= 8;
- }
- }
-
- void SetStream(ISequentialInStream *stream) { Stream.SetStream(stream); }
- void Init()
- {
- Stream.Init();
- Code = 0;
- Range = 0xFFFFFFFF;
- for(int i = 0; i < 5; i++)
- Code = (Code << 8) | Stream.ReadByte();
- }
-
- void ReleaseStream() { Stream.ReleaseStream(); }
-
- UInt32 GetThreshold(UInt32 total)
- {
- return (Code) / ( Range /= total);
- }
-
- void Decode(UInt32 start, UInt32 size)
- {
- Code -= start * Range;
- Range *= size;
- Normalize();
- }
-
- UInt32 DecodeDirectBits(int numTotalBits)
- {
- UInt32 range = Range;
- UInt32 code = Code;
- UInt32 result = 0;
- for (int i = numTotalBits; i != 0; i--)
- {
- range >>= 1;
- /*
- result <<= 1;
- if (code >= range)
- {
- code -= range;
- result |= 1;
- }
- */
- UInt32 t = (code - range) >> 31;
- code -= range & (t - 1);
- result = (result << 1) | (1 - t);
-
- if (range < kTopValue)
- {
- code = (code << 8) | Stream.ReadByte();
- range <<= 8;
- }
- }
- Range = range;
- Code = code;
- return result;
- }
-
- UInt32 DecodeBit(UInt32 size0, UInt32 numTotalBits)
- {
- UInt32 newBound = (Range >> numTotalBits) * size0;
- UInt32 symbol;
- if (Code < newBound)
- {
- symbol = 0;
- Range = newBound;
- }
- else
- {
- symbol = 1;
- Code -= newBound;
- Range -= newBound;
- }
- Normalize();
- return symbol;
- }
-
- UInt64 GetProcessedSize() {return Stream.GetProcessedSize(); }
-};
-
-}}
-
-#endif
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