public static uint ReverseDecode(
LzmaRangeBitDecoder[] models,
uint startIndex,
LzmaRangeDecoder rangeDecoder,
int numBitLevels)
{
uint num1 = 1;
uint num2 = 0;
if (rangeDecoder.CheckInputRequired(numBitLevels, false))
{
for (int index = 0; index < numBitLevels; ++index)
{
uint num3 = models[(IntPtr)(startIndex + num1)].Decode(rangeDecoder);
if (!rangeDecoder.InputRequired)
{
num1 = (num1 << 1) + num3;
num2 |= num3 << index;
}
else
{
break;
}
}
}
return(num2);
}
public byte DecodeWithMatchByte(
LzmaRangeDecoder rangeDecoder,
uint pos,
byte previousByte,
byte matchByte)
{
return(this.coders[(IntPtr)this.GetState(pos, previousByte)].DecodeWithMatchByte(rangeDecoder, matchByte));
}
public byte DecodeNormal(LzmaRangeDecoder rangeDecoder)
{
uint num = 1;
do
{
num = num << 1 | this.decoders[(IntPtr)num].Decode(rangeDecoder);
}while (num < 256U);
return((byte)num);
}
public uint Decode(LzmaRangeDecoder rangeDecoder)
{
uint num = 1;
if (rangeDecoder.CheckInputRequired(this.bitLevels, false))
{
for (int bitLevels = this.bitLevels; bitLevels > 0; --bitLevels)
{
num = (num << 1) + this.models[(IntPtr)num].Decode(rangeDecoder);
}
}
return(num - (uint)(1 << this.bitLevels));
}
public uint Decode(LzmaRangeDecoder rangeDecoder, uint positionState)
{
rangeDecoder.SaveState();
uint num1 = this.choice.Decode(rangeDecoder);
if (rangeDecoder.InputRequired)
{
return(0);
}
uint num2;
if (num1 == 0U)
{
num2 = this.lowCoder[(IntPtr)positionState].Decode(rangeDecoder);
}
else
{
num2 = 8U;
uint num3 = this.choice2.Decode(rangeDecoder);
if (!rangeDecoder.InputRequired)
{
if (num3 == 0U)
{
num2 += this.middleCoder[(IntPtr)positionState].Decode(rangeDecoder);
}
else
{
num2 = num2 + 8U + this.highCoder.Decode(rangeDecoder);
}
}
if (rangeDecoder.InputRequired)
{
this.choice2.RestoreState();
}
}
if (rangeDecoder.InputRequired)
{
this.choice.RestoreState();
rangeDecoder.RestoreState();
}
return(num2);
}
public byte DecodeWithMatchByte(LzmaRangeDecoder rangeDecoder, byte matchByte)
{
uint num1 = 1;
do
{
uint num2 = (uint)((int)matchByte >> 7 & 1);
matchByte <<= 1;
uint num3 = this.decoders[(IntPtr)((uint)(1 + (int)num2 << 8) + num1)].Decode(rangeDecoder);
num1 = num1 << 1 | num3;
if ((int)num2 != (int)num3)
{
while (num1 < 256U)
{
num1 = num1 << 1 | this.decoders[(IntPtr)num1].Decode(rangeDecoder);
}
break;
}
}while (num1 < 256U);
return((byte)num1);
}
public uint ReverseDecode(LzmaRangeDecoder rangeDecoder)
{
return(LzmaBitTreeDecoder.ReverseDecode(this.models, 0U, rangeDecoder, this.bitLevels));
}
public byte DecodeNormal(LzmaRangeDecoder rangeDecoder, uint position, byte previousByte)
{
return(this.coders[(IntPtr)this.GetState(position, previousByte)].DecodeNormal(rangeDecoder));
}
