public int Decode(TRangeDecoder rangeDecoder)
{
int m, bitIndex;
m = 1;
for (bitIndex = NumBitLevels; bitIndex >= 1; bitIndex--)
{
m = m << 1 + rangeDecoder.DecodeBit(Models, m);
}
return(m - (1 << NumBitLevels));
}
public byte DecodeNormal(TRangeDecoder rangeDecoder)
{
int symbol;
symbol = 1;
do
{
symbol = (symbol << 1) | rangeDecoder.DecodeBit(m_Decoders, symbol);
} while (symbol < 0x100);
return((byte)symbol);
}
public static int ReverseDecode(short[] Models, int startIndex, TRangeDecoder rangeDecoder, int NumBitLevels)
{
int m, symbol, bitindex, bit;
m = 1;
symbol = 0;
for (bitindex = 0; bitindex < NumBitLevels; bitindex++)
{
bit = rangeDecoder.DecodeBit(Models, startIndex + m);
m = (m << 1) + bit;
symbol = symbol | bit << bitindex;
}
return(symbol);
}
public int ReverseDecode(TRangeDecoder rangeDecoder)
{
int m, symbol, bitindex, bit;
m = 1;
symbol = 0;
for (bitindex = 0; bitindex < NumBitLevels; bitindex++)
{
bit = rangeDecoder.DecodeBit(Models, m);
m = (m << 1) + bit;
symbol = symbol | (bit << bitindex);
}
return(symbol);
}
public TLZMADecoder()
{
int i;
FOnProgress = null;
m_OutWindow = new TLZOutWindow();
m_RangeDecoder = new TRangeDecoder();
m_PosAlignDecoder = new TBitTreeDecoder(ULZMABase.kNumAlignBits);
m_LenDecoder = new TLZMALenDecoder();
m_RepLenDecoder = new TLZMALenDecoder();
m_LiteralDecoder = new TLZMALiteralDecoder();
m_DictionarySize = -1;
m_DictionarySizeCheck = -1;
for (i = 0; i < ULZMABase.kNumLenToPosStates; i++)
{
m_PosSlotDecoder[i] = new TBitTreeDecoder(ULZMABase.kNumPosSlotBits);
}
}
public int Decode(TRangeDecoder rangeDecoder, int posState)
{
int symbol;
if (rangeDecoder.DecodeBit(m_Choice, 0) == 0)
{
return(m_LowCoder[posState].Decode(rangeDecoder));
}
symbol = ULZMABase.kNumLowLenSymbols;
if (rangeDecoder.DecodeBit(m_Choice, 1) == 0)
{
symbol = symbol + m_MidCoder[posState].Decode(rangeDecoder);
}
else
{
symbol = symbol + ULZMABase.kNumMidLenSymbols + m_HighCoder.Decode(rangeDecoder);
}
return(symbol);
}
public byte DecodeWithMatchByte(TRangeDecoder rangeDecoder, byte matchByte)
{
int symbol;
int matchBit;
int bit;
symbol = 1;
do
{
matchBit = (matchByte >> 7) & 1;
matchByte = (byte)(matchByte << 1);
bit = rangeDecoder.DecodeBit(m_Decoders, ((1 + matchBit) << 8) + symbol);
symbol = (symbol << 1) | bit;
if (matchBit != bit)
{
while (symbol < 0x100)
{
symbol = (symbol << 1) | rangeDecoder.DecodeBit(m_Decoders, symbol);
}
break;
}
} while (symbol < 0x100);
return((byte)symbol);
}
