--- a/misc/libphysfs/lzma/CS/7zip/Compress/RangeCoder/RangeCoder.cs Wed May 16 18:22:28 2018 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,234 +0,0 @@
-using System;
-
-namespace SevenZip.Compression.RangeCoder
-{
- class Encoder
- {
- public const uint kTopValue = (1 << 24);
-
- System.IO.Stream Stream;
-
- public UInt64 Low;
- public uint Range;
- uint _cacheSize;
- byte _cache;
-
- long StartPosition;
-
- public void SetStream(System.IO.Stream stream)
- {
- Stream = stream;
- }
-
- public void ReleaseStream()
- {
- Stream = null;
- }
-
- public void Init()
- {
- StartPosition = Stream.Position;
-
- Low = 0;
- Range = 0xFFFFFFFF;
- _cacheSize = 1;
- _cache = 0;
- }
-
- public void FlushData()
- {
- for (int i = 0; i < 5; i++)
- ShiftLow();
- }
-
- public void FlushStream()
- {
- Stream.Flush();
- }
-
- public void CloseStream()
- {
- Stream.Close();
- }
-
- public void Encode(uint start, uint size, uint total)
- {
- Low += start * (Range /= total);
- Range *= size;
- while (Range < kTopValue)
- {
- Range <<= 8;
- ShiftLow();
- }
- }
-
- public void ShiftLow()
- {
- if ((uint)Low < (uint)0xFF000000 || (uint)(Low >> 32) == 1)
- {
- byte temp = _cache;
- do
- {
- Stream.WriteByte((byte)(temp + (Low >> 32)));
- temp = 0xFF;
- }
- while (--_cacheSize != 0);
- _cache = (byte)(((uint)Low) >> 24);
- }
- _cacheSize++;
- Low = ((uint)Low) << 8;
- }
-
- public void EncodeDirectBits(uint v, int numTotalBits)
- {
- for (int i = numTotalBits - 1; i >= 0; i--)
- {
- Range >>= 1;
- if (((v >> i) & 1) == 1)
- Low += Range;
- if (Range < kTopValue)
- {
- Range <<= 8;
- ShiftLow();
- }
- }
- }
-
- public void EncodeBit(uint size0, int numTotalBits, uint symbol)
- {
- uint newBound = (Range >> numTotalBits) * size0;
- if (symbol == 0)
- Range = newBound;
- else
- {
- Low += newBound;
- Range -= newBound;
- }
- while (Range < kTopValue)
- {
- Range <<= 8;
- ShiftLow();
- }
- }
-
- public long GetProcessedSizeAdd()
- {
- return _cacheSize +
- Stream.Position - StartPosition + 4;
- // (long)Stream.GetProcessedSize();
- }
- }
-
- class Decoder
- {
- public const uint kTopValue = (1 << 24);
- public uint Range;
- public uint Code;
- // public Buffer.InBuffer Stream = new Buffer.InBuffer(1 << 16);
- public System.IO.Stream Stream;
-
- public void Init(System.IO.Stream stream)
- {
- // Stream.Init(stream);
- Stream = stream;
-
- Code = 0;
- Range = 0xFFFFFFFF;
- for (int i = 0; i < 5; i++)
- Code = (Code << 8) | (byte)Stream.ReadByte();
- }
-
- public void ReleaseStream()
- {
- // Stream.ReleaseStream();
- Stream = null;
- }
-
- public void CloseStream()
- {
- Stream.Close();
- }
-
- public void Normalize()
- {
- while (Range < kTopValue)
- {
- Code = (Code << 8) | (byte)Stream.ReadByte();
- Range <<= 8;
- }
- }
-
- public void Normalize2()
- {
- if (Range < kTopValue)
- {
- Code = (Code << 8) | (byte)Stream.ReadByte();
- Range <<= 8;
- }
- }
-
- public uint GetThreshold(uint total)
- {
- return Code / (Range /= total);
- }
-
- public void Decode(uint start, uint size, uint total)
- {
- Code -= start * Range;
- Range *= size;
- Normalize();
- }
-
- public uint DecodeDirectBits(int numTotalBits)
- {
- uint range = Range;
- uint code = Code;
- uint result = 0;
- for (int i = numTotalBits; i > 0; i--)
- {
- range >>= 1;
- /*
- result <<= 1;
- if (code >= range)
- {
- code -= range;
- result |= 1;
- }
- */
- uint t = (code - range) >> 31;
- code -= range & (t - 1);
- result = (result << 1) | (1 - t);
-
- if (range < kTopValue)
- {
- code = (code << 8) | (byte)Stream.ReadByte();
- range <<= 8;
- }
- }
- Range = range;
- Code = code;
- return result;
- }
-
- public uint DecodeBit(uint size0, int numTotalBits)
- {
- uint newBound = (Range >> numTotalBits) * size0;
- uint symbol;
- if (Code < newBound)
- {
- symbol = 0;
- Range = newBound;
- }
- else
- {
- symbol = 1;
- Code -= newBound;
- Range -= newBound;
- }
- Normalize();
- return symbol;
- }
-
- // ulong GetProcessedSize() {return Stream.GetProcessedSize(); }
- }
-}