public int DecodeBit(short[] probs, int index)
{
short prob;
int newBound;
prob = probs[index];
newBound = (Range >> kNumBitModelTotalBits) * prob;
if ((Code ^ unchecked ((int)0x80000000)) < (newBound ^ unchecked ((int)0x80000000)))
{
Range = newBound;
probs[index] = (short)(prob + ((kBitModelTotal - prob) >> kNumMoveBits));
if ((Range & kTopMask) == 0)
{
Code = (Code << 8) | ULZMACommon.ReadByte(Stream);
Range = Range << 8;
}
return(0);
}
else
{
Range = Range - newBound;
Code = Code - newBound;
probs[index] = (short)(prob - ((prob) >> kNumMoveBits));
if ((Range & kTopMask) == 0)
{
Code = (Code << 8) | ULZMACommon.ReadByte(Stream);
Range = Range << 8;
}
return(1);
}
}
public void Init()
{
int i;
Code = 0;
Range = -1;
for (i = 0; i < 5; i++)
{
Code = (Code << 8) | ULZMACommon.ReadByte(Stream);
}
}
public int DecodeDirectBits(int numTotalBits)
{
int i, t;
int result = 0;
for (i = numTotalBits; i >= 1; i--)
{
Range = Range >> 1;
t = ((Code - Range) >> 31);
Code = Code - Range & (t - 1);
result = (result << 1) | (1 - t);
if ((Range & kTopMask) == 0)
{
Code = (Code << 8) | ULZMACommon.ReadByte(Stream);
Range = Range << 8;
}
}
return(result);
}