diff options
Diffstat (limited to 'other-licenses/7zstub/src/CS/7zip/Compress/LZMA/LzmaDecoder.cs')
| -rw-r--r-- | other-licenses/7zstub/src/CS/7zip/Compress/LZMA/LzmaDecoder.cs | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/CS/7zip/Compress/LZMA/LzmaDecoder.cs b/other-licenses/7zstub/src/CS/7zip/Compress/LZMA/LzmaDecoder.cs new file mode 100644 index 000000000..00bfe6380 --- /dev/null +++ b/other-licenses/7zstub/src/CS/7zip/Compress/LZMA/LzmaDecoder.cs @@ -0,0 +1,398 @@ +// LzmaDecoder.cs
+
+using System;
+
+namespace SevenZip.Compression.LZMA
+{
+ using RangeCoder;
+
+ public class Decoder : ICoder, ISetDecoderProperties // ,System.IO.Stream
+ {
+ class LenDecoder
+ {
+ BitDecoder m_Choice = new BitDecoder();
+ BitDecoder m_Choice2 = new BitDecoder();
+ BitTreeDecoder[] m_LowCoder = new BitTreeDecoder[Base.kNumPosStatesMax];
+ BitTreeDecoder[] m_MidCoder = new BitTreeDecoder[Base.kNumPosStatesMax];
+ BitTreeDecoder m_HighCoder = new BitTreeDecoder(Base.kNumHighLenBits);
+ uint m_NumPosStates = 0;
+
+ public void Create(uint numPosStates)
+ {
+ for (uint posState = m_NumPosStates; posState < numPosStates; posState++)
+ {
+ m_LowCoder[posState] = new BitTreeDecoder(Base.kNumLowLenBits);
+ m_MidCoder[posState] = new BitTreeDecoder(Base.kNumMidLenBits);
+ }
+ m_NumPosStates = numPosStates;
+ }
+
+ public void Init()
+ {
+ m_Choice.Init();
+ for (uint posState = 0; posState < m_NumPosStates; posState++)
+ {
+ m_LowCoder[posState].Init();
+ m_MidCoder[posState].Init();
+ }
+ m_Choice2.Init();
+ m_HighCoder.Init();
+ }
+
+ public uint Decode(RangeCoder.Decoder rangeDecoder, uint posState)
+ {
+ if (m_Choice.Decode(rangeDecoder) == 0)
+ return m_LowCoder[posState].Decode(rangeDecoder);
+ else
+ {
+ uint symbol = Base.kNumLowLenSymbols;
+ if (m_Choice2.Decode(rangeDecoder) == 0)
+ symbol += m_MidCoder[posState].Decode(rangeDecoder);
+ else
+ {
+ symbol += Base.kNumMidLenSymbols;
+ symbol += m_HighCoder.Decode(rangeDecoder);
+ }
+ return symbol;
+ }
+ }
+ }
+
+ class LiteralDecoder
+ {
+ struct Decoder2
+ {
+ BitDecoder[] m_Decoders;
+ public void Create() { m_Decoders = new BitDecoder[0x300]; }
+ public void Init() { for (int i = 0; i < 0x300; i++) m_Decoders[i].Init(); }
+
+ public byte DecodeNormal(RangeCoder.Decoder rangeDecoder)
+ {
+ uint symbol = 1;
+ do
+ symbol = (symbol << 1) | m_Decoders[symbol].Decode(rangeDecoder);
+ while (symbol < 0x100);
+ return (byte)symbol;
+ }
+
+ public byte DecodeWithMatchByte(RangeCoder.Decoder rangeDecoder, byte matchByte)
+ {
+ uint symbol = 1;
+ do
+ {
+ uint matchBit = (uint)(matchByte >> 7) & 1;
+ matchByte <<= 1;
+ uint bit = m_Decoders[((1 + matchBit) << 8) + symbol].Decode(rangeDecoder);
+ symbol = (symbol << 1) | bit;
+ if (matchBit != bit)
+ {
+ while (symbol < 0x100)
+ symbol = (symbol << 1) | m_Decoders[symbol].Decode(rangeDecoder);
+ break;
+ }
+ }
+ while (symbol < 0x100);
+ return (byte)symbol;
+ }
+ }
+
+ Decoder2[] m_Coders;
+ int m_NumPrevBits;
+ int m_NumPosBits;
+ uint m_PosMask;
+
+ public void Create(int numPosBits, int numPrevBits)
+ {
+ if (m_Coders != null && m_NumPrevBits == numPrevBits &&
+ m_NumPosBits == numPosBits)
+ return;
+ m_NumPosBits = numPosBits;
+ m_PosMask = ((uint)1 << numPosBits) - 1;
+ m_NumPrevBits = numPrevBits;
+ uint numStates = (uint)1 << (m_NumPrevBits + m_NumPosBits);
+ m_Coders = new Decoder2[numStates];
+ for (uint i = 0; i < numStates; i++)
+ m_Coders[i].Create();
+ }
+
+ public void Init()
+ {
+ uint numStates = (uint)1 << (m_NumPrevBits + m_NumPosBits);
+ for (uint i = 0; i < numStates; i++)
+ m_Coders[i].Init();
+ }
+
+ uint GetState(uint pos, byte prevByte)
+ { return ((pos & m_PosMask) << m_NumPrevBits) + (uint)(prevByte >> (8 - m_NumPrevBits)); }
+
+ public byte DecodeNormal(RangeCoder.Decoder rangeDecoder, uint pos, byte prevByte)
+ { return m_Coders[GetState(pos, prevByte)].DecodeNormal(rangeDecoder); }
+
+ public byte DecodeWithMatchByte(RangeCoder.Decoder rangeDecoder, uint pos, byte prevByte, byte matchByte)
+ { return m_Coders[GetState(pos, prevByte)].DecodeWithMatchByte(rangeDecoder, matchByte); }
+ };
+
+ LZ.OutWindow m_OutWindow = new LZ.OutWindow();
+ RangeCoder.Decoder m_RangeDecoder = new RangeCoder.Decoder();
+
+ BitDecoder[] m_IsMatchDecoders = new BitDecoder[Base.kNumStates << Base.kNumPosStatesBitsMax];
+ BitDecoder[] m_IsRepDecoders = new BitDecoder[Base.kNumStates];
+ BitDecoder[] m_IsRepG0Decoders = new BitDecoder[Base.kNumStates];
+ BitDecoder[] m_IsRepG1Decoders = new BitDecoder[Base.kNumStates];
+ BitDecoder[] m_IsRepG2Decoders = new BitDecoder[Base.kNumStates];
+ BitDecoder[] m_IsRep0LongDecoders = new BitDecoder[Base.kNumStates << Base.kNumPosStatesBitsMax];
+
+ BitTreeDecoder[] m_PosSlotDecoder = new BitTreeDecoder[Base.kNumLenToPosStates];
+ BitDecoder[] m_PosDecoders = new BitDecoder[Base.kNumFullDistances - Base.kEndPosModelIndex];
+
+ BitTreeDecoder m_PosAlignDecoder = new BitTreeDecoder(Base.kNumAlignBits);
+
+ LenDecoder m_LenDecoder = new LenDecoder();
+ LenDecoder m_RepLenDecoder = new LenDecoder();
+
+ LiteralDecoder m_LiteralDecoder = new LiteralDecoder();
+
+ uint m_DictionarySize;
+ uint m_DictionarySizeCheck;
+
+ uint m_PosStateMask;
+
+ public Decoder()
+ {
+ m_DictionarySize = 0xFFFFFFFF;
+ for (int i = 0; i < Base.kNumLenToPosStates; i++)
+ m_PosSlotDecoder[i] = new BitTreeDecoder(Base.kNumPosSlotBits);
+ }
+
+ void SetDictionarySize(uint dictionarySize)
+ {
+ if (m_DictionarySize != dictionarySize)
+ {
+ m_DictionarySize = dictionarySize;
+ m_DictionarySizeCheck = Math.Max(m_DictionarySize, 1);
+ uint blockSize = Math.Max(m_DictionarySizeCheck, (1 << 12));
+ m_OutWindow.Create(blockSize);
+ }
+ }
+
+ void SetLiteralProperties(int lp, int lc)
+ {
+ if (lp > 8)
+ throw new InvalidParamException();
+ if (lc > 8)
+ throw new InvalidParamException();
+ m_LiteralDecoder.Create(lp, lc);
+ }
+
+ void SetPosBitsProperties(int pb)
+ {
+ if (pb > Base.kNumPosStatesBitsMax)
+ throw new InvalidParamException();
+ uint numPosStates = (uint)1 << pb;
+ m_LenDecoder.Create(numPosStates);
+ m_RepLenDecoder.Create(numPosStates);
+ m_PosStateMask = numPosStates - 1;
+ }
+
+ bool _solid = false;
+ void Init(System.IO.Stream inStream, System.IO.Stream outStream)
+ {
+ m_RangeDecoder.Init(inStream);
+ m_OutWindow.Init(outStream, _solid);
+
+ uint i;
+ for (i = 0; i < Base.kNumStates; i++)
+ {
+ for (uint j = 0; j <= m_PosStateMask; j++)
+ {
+ uint index = (i << Base.kNumPosStatesBitsMax) + j;
+ m_IsMatchDecoders[index].Init();
+ m_IsRep0LongDecoders[index].Init();
+ }
+ m_IsRepDecoders[i].Init();
+ m_IsRepG0Decoders[i].Init();
+ m_IsRepG1Decoders[i].Init();
+ m_IsRepG2Decoders[i].Init();
+ }
+
+ m_LiteralDecoder.Init();
+ for (i = 0; i < Base.kNumLenToPosStates; i++)
+ m_PosSlotDecoder[i].Init();
+ // m_PosSpecDecoder.Init();
+ for (i = 0; i < Base.kNumFullDistances - Base.kEndPosModelIndex; i++)
+ m_PosDecoders[i].Init();
+
+ m_LenDecoder.Init();
+ m_RepLenDecoder.Init();
+ m_PosAlignDecoder.Init();
+ }
+
+ public void Code(System.IO.Stream inStream, System.IO.Stream outStream,
+ Int64 inSize, Int64 outSize, ICodeProgress progress)
+ {
+ Init(inStream, outStream);
+
+ Base.State state = new Base.State();
+ state.Init();
+ uint rep0 = 0, rep1 = 0, rep2 = 0, rep3 = 0;
+
+ UInt64 nowPos64 = 0;
+ UInt64 outSize64 = (UInt64)outSize;
+ if (nowPos64 < outSize64)
+ {
+ if (m_IsMatchDecoders[state.Index << Base.kNumPosStatesBitsMax].Decode(m_RangeDecoder) != 0)
+ throw new DataErrorException();
+ state.UpdateChar();
+ byte b = m_LiteralDecoder.DecodeNormal(m_RangeDecoder, 0, 0);
+ m_OutWindow.PutByte(b);
+ nowPos64++;
+ }
+ while (nowPos64 < outSize64)
+ {
+ // UInt64 next = Math.Min(nowPos64 + (1 << 18), outSize64);
+ // while(nowPos64 < next)
+ {
+ uint posState = (uint)nowPos64 & m_PosStateMask;
+ if (m_IsMatchDecoders[(state.Index << Base.kNumPosStatesBitsMax) + posState].Decode(m_RangeDecoder) == 0)
+ {
+ byte b;
+ byte prevByte = m_OutWindow.GetByte(0);
+ if (!state.IsCharState())
+ b = m_LiteralDecoder.DecodeWithMatchByte(m_RangeDecoder,
+ (uint)nowPos64, prevByte, m_OutWindow.GetByte(rep0));
+ else
+ b = m_LiteralDecoder.DecodeNormal(m_RangeDecoder, (uint)nowPos64, prevByte);
+ m_OutWindow.PutByte(b);
+ state.UpdateChar();
+ nowPos64++;
+ }
+ else
+ {
+ uint len;
+ if (m_IsRepDecoders[state.Index].Decode(m_RangeDecoder) == 1)
+ {
+ if (m_IsRepG0Decoders[state.Index].Decode(m_RangeDecoder) == 0)
+ {
+ if (m_IsRep0LongDecoders[(state.Index << Base.kNumPosStatesBitsMax) + posState].Decode(m_RangeDecoder) == 0)
+ {
+ state.UpdateShortRep();
+ m_OutWindow.PutByte(m_OutWindow.GetByte(rep0));
+ nowPos64++;
+ continue;
+ }
+ }
+ else
+ {
+ UInt32 distance;
+ if (m_IsRepG1Decoders[state.Index].Decode(m_RangeDecoder) == 0)
+ {
+ distance = rep1;
+ }
+ else
+ {
+ if (m_IsRepG2Decoders[state.Index].Decode(m_RangeDecoder) == 0)
+ distance = rep2;
+ else
+ {
+ distance = rep3;
+ rep3 = rep2;
+ }
+ rep2 = rep1;
+ }
+ rep1 = rep0;
+ rep0 = distance;
+ }
+ len = m_RepLenDecoder.Decode(m_RangeDecoder, posState) + Base.kMatchMinLen;
+ state.UpdateRep();
+ }
+ else
+ {
+ rep3 = rep2;
+ rep2 = rep1;
+ rep1 = rep0;
+ len = Base.kMatchMinLen + m_LenDecoder.Decode(m_RangeDecoder, posState);
+ state.UpdateMatch();
+ uint posSlot = m_PosSlotDecoder[Base.GetLenToPosState(len)].Decode(m_RangeDecoder);
+ if (posSlot >= Base.kStartPosModelIndex)
+ {
+ int numDirectBits = (int)((posSlot >> 1) - 1);
+ rep0 = ((2 | (posSlot & 1)) << numDirectBits);
+ if (posSlot < Base.kEndPosModelIndex)
+ rep0 += BitTreeDecoder.ReverseDecode(m_PosDecoders,
+ rep0 - posSlot - 1, m_RangeDecoder, numDirectBits);
+ else
+ {
+ rep0 += (m_RangeDecoder.DecodeDirectBits(
+ numDirectBits - Base.kNumAlignBits) << Base.kNumAlignBits);
+ rep0 += m_PosAlignDecoder.ReverseDecode(m_RangeDecoder);
+ }
+ }
+ else
+ rep0 = posSlot;
+ }
+ if (rep0 >= m_OutWindow.TrainSize + nowPos64 || rep0 >= m_DictionarySizeCheck)
+ {
+ if (rep0 == 0xFFFFFFFF)
+ break;
+ throw new DataErrorException();
+ }
+ m_OutWindow.CopyBlock(rep0, len);
+ nowPos64 += len;
+ }
+ }
+ }
+ m_OutWindow.Flush();
+ m_OutWindow.ReleaseStream();
+ m_RangeDecoder.ReleaseStream();
+ }
+
+ public void SetDecoderProperties(byte[] properties)
+ {
+ if (properties.Length < 5)
+ throw new InvalidParamException();
+ int lc = properties[0] % 9;
+ int remainder = properties[0] / 9;
+ int lp = remainder % 5;
+ int pb = remainder / 5;
+ if (pb > Base.kNumPosStatesBitsMax)
+ throw new InvalidParamException();
+ UInt32 dictionarySize = 0;
+ for (int i = 0; i < 4; i++)
+ dictionarySize += ((UInt32)(properties[1 + i])) << (i * 8);
+ SetDictionarySize(dictionarySize);
+ SetLiteralProperties(lp, lc);
+ SetPosBitsProperties(pb);
+ }
+
+ public bool Train(System.IO.Stream stream)
+ {
+ _solid = true;
+ return m_OutWindow.Train(stream);
+ }
+
+ /*
+ public override bool CanRead { get { return true; }}
+ public override bool CanWrite { get { return true; }}
+ public override bool CanSeek { get { return true; }}
+ public override long Length { get { return 0; }}
+ public override long Position
+ {
+ get { return 0; }
+ set { }
+ }
+ public override void Flush() { }
+ public override int Read(byte[] buffer, int offset, int count)
+ {
+ return 0;
+ }
+ public override void Write(byte[] buffer, int offset, int count)
+ {
+ }
+ public override long Seek(long offset, System.IO.SeekOrigin origin)
+ {
+ return 0;
+ }
+ public override void SetLength(long value) {}
+ */
+ }
+}
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