mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
330 lines
9.8 KiB
Java
330 lines
9.8 KiB
Java
package SevenZip.Compression.LZMA;
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import SevenZip.Compression.RangeCoder.BitTreeDecoder;
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import SevenZip.Compression.LZMA.Base;
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import SevenZip.Compression.LZ.OutWindow;
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import java.io.IOException;
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public class Decoder
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{
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class LenDecoder
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{
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short[] m_Choice = new short[2];
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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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int m_NumPosStates = 0;
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public void Create(int numPosStates)
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{
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for (; m_NumPosStates < numPosStates; m_NumPosStates++)
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{
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m_LowCoder[m_NumPosStates] = new BitTreeDecoder(Base.kNumLowLenBits);
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m_MidCoder[m_NumPosStates] = new BitTreeDecoder(Base.kNumMidLenBits);
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}
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}
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public void Init()
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{
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_Choice);
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for (int 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_HighCoder.Init();
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}
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public int Decode(SevenZip.Compression.RangeCoder.Decoder rangeDecoder, int posState) throws IOException
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{
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if (rangeDecoder.DecodeBit(m_Choice, 0) == 0)
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return m_LowCoder[posState].Decode(rangeDecoder);
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int symbol = Base.kNumLowLenSymbols;
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if (rangeDecoder.DecodeBit(m_Choice, 1) == 0)
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symbol += m_MidCoder[posState].Decode(rangeDecoder);
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else
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symbol += Base.kNumMidLenSymbols + m_HighCoder.Decode(rangeDecoder);
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return symbol;
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}
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}
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class LiteralDecoder
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{
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class Decoder2
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{
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short[] m_Decoders = new short[0x300];
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public void Init()
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{
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_Decoders);
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}
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public byte DecodeNormal(SevenZip.Compression.RangeCoder.Decoder rangeDecoder) throws IOException
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{
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int symbol = 1;
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do
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symbol = (symbol << 1) | rangeDecoder.DecodeBit(m_Decoders, symbol);
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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(SevenZip.Compression.RangeCoder.Decoder rangeDecoder, byte matchByte) throws IOException
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{
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int symbol = 1;
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do
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{
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int matchBit = (matchByte >> 7) & 1;
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matchByte <<= 1;
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int bit = rangeDecoder.DecodeBit(m_Decoders, ((1 + matchBit) << 8) + symbol);
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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) | rangeDecoder.DecodeBit(m_Decoders, symbol);
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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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int 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 && m_NumPosBits == numPosBits)
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return;
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m_NumPosBits = numPosBits;
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m_PosMask = (1 << numPosBits) - 1;
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m_NumPrevBits = numPrevBits;
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int numStates = 1 << (m_NumPrevBits + m_NumPosBits);
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m_Coders = new Decoder2[numStates];
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for (int i = 0; i < numStates; i++)
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m_Coders[i] = new Decoder2();
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}
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public void Init()
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{
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int numStates = 1 << (m_NumPrevBits + m_NumPosBits);
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for (int i = 0; i < numStates; i++)
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m_Coders[i].Init();
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}
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Decoder2 GetDecoder(int pos, byte prevByte)
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{
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return m_Coders[((pos & m_PosMask) << m_NumPrevBits) + ((prevByte & 0xFF) >>> (8 - m_NumPrevBits))];
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}
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}
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OutWindow m_OutWindow = new OutWindow();
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SevenZip.Compression.RangeCoder.Decoder m_RangeDecoder = new SevenZip.Compression.RangeCoder.Decoder();
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short[] m_IsMatchDecoders = new short[Base.kNumStates << Base.kNumPosStatesBitsMax];
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short[] m_IsRepDecoders = new short[Base.kNumStates];
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short[] m_IsRepG0Decoders = new short[Base.kNumStates];
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short[] m_IsRepG1Decoders = new short[Base.kNumStates];
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short[] m_IsRepG2Decoders = new short[Base.kNumStates];
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short[] m_IsRep0LongDecoders = new short[Base.kNumStates << Base.kNumPosStatesBitsMax];
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BitTreeDecoder[] m_PosSlotDecoder = new BitTreeDecoder[Base.kNumLenToPosStates];
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short[] m_PosDecoders = new short[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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int m_DictionarySize = -1;
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int m_DictionarySizeCheck = -1;
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int m_PosStateMask;
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public Decoder()
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{
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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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boolean SetDictionarySize(int dictionarySize)
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{
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if (dictionarySize < 0)
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return false;
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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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m_OutWindow.Create(Math.max(m_DictionarySizeCheck, (1 << 12)));
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}
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return true;
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}
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boolean SetLcLpPb(int lc, int lp, int pb)
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{
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if (lc > Base.kNumLitContextBitsMax || lp > 4 || pb > Base.kNumPosStatesBitsMax)
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return false;
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m_LiteralDecoder.Create(lp, lc);
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int numPosStates = 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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return true;
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}
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void Init() throws IOException
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{
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m_OutWindow.Init(false);
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_IsMatchDecoders);
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_IsRep0LongDecoders);
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_IsRepDecoders);
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_IsRepG0Decoders);
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_IsRepG1Decoders);
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_IsRepG2Decoders);
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SevenZip.Compression.RangeCoder.Decoder.InitBitModels(m_PosDecoders);
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m_LiteralDecoder.Init();
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int i;
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for (i = 0; i < Base.kNumLenToPosStates; i++)
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m_PosSlotDecoder[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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m_RangeDecoder.Init();
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}
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public boolean Code(java.io.InputStream inStream, java.io.OutputStream outStream,
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long outSize) throws IOException
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{
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m_RangeDecoder.SetStream(inStream);
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m_OutWindow.SetStream(outStream);
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Init();
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int state = Base.StateInit();
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int rep0 = 0, rep1 = 0, rep2 = 0, rep3 = 0;
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long nowPos64 = 0;
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byte prevByte = 0;
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while (outSize < 0 || nowPos64 < outSize)
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{
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int posState = (int)nowPos64 & m_PosStateMask;
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if (m_RangeDecoder.DecodeBit(m_IsMatchDecoders, (state << Base.kNumPosStatesBitsMax) + posState) == 0)
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{
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LiteralDecoder.Decoder2 decoder2 = m_LiteralDecoder.GetDecoder((int)nowPos64, prevByte);
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if (!Base.StateIsCharState(state))
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prevByte = decoder2.DecodeWithMatchByte(m_RangeDecoder, m_OutWindow.GetByte(rep0));
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else
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prevByte = decoder2.DecodeNormal(m_RangeDecoder);
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m_OutWindow.PutByte(prevByte);
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state = Base.StateUpdateChar(state);
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nowPos64++;
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}
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else
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{
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int len;
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if (m_RangeDecoder.DecodeBit(m_IsRepDecoders, state) == 1)
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{
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len = 0;
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if (m_RangeDecoder.DecodeBit(m_IsRepG0Decoders, state) == 0)
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{
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if (m_RangeDecoder.DecodeBit(m_IsRep0LongDecoders, (state << Base.kNumPosStatesBitsMax) + posState) == 0)
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{
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state = Base.StateUpdateShortRep(state);
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len = 1;
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}
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}
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else
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{
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int distance;
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if (m_RangeDecoder.DecodeBit(m_IsRepG1Decoders, state) == 0)
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distance = rep1;
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else
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{
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if (m_RangeDecoder.DecodeBit(m_IsRepG2Decoders, state) == 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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if (len == 0)
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{
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len = m_RepLenDecoder.Decode(m_RangeDecoder, posState) + Base.kMatchMinLen;
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state = Base.StateUpdateRep(state);
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}
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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 = Base.StateUpdateMatch(state);
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int 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 = (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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if (rep0 < 0)
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{
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if (rep0 == -1)
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break;
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return false;
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}
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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 >= nowPos64 || rep0 >= m_DictionarySizeCheck)
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{
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// m_OutWindow.Flush();
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return false;
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}
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m_OutWindow.CopyBlock(rep0, len);
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nowPos64 += len;
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prevByte = m_OutWindow.GetByte(0);
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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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return true;
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}
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public boolean SetDecoderProperties(byte[] properties)
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{
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if (properties.length < 5)
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return false;
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int val = properties[0] & 0xFF;
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int lc = val % 9;
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int remainder = val / 9;
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int lp = remainder % 5;
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int pb = remainder / 5;
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int dictionarySize = 0;
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for (int i = 0; i < 4; i++)
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dictionarySize += ((int)(properties[1 + i]) & 0xFF) << (i * 8);
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if (!SetLcLpPb(lc, lp, pb))
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return false;
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return SetDictionarySize(dictionarySize);
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}
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}
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