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