private uint[] CalculateHuffmanCode()
{
uint[] numArray1 = new uint[17];
foreach (int codeLength in this.codeLengthArray)
{
++numArray1[codeLength];
}
numArray1[0] = 0U;
uint[] numArray2 = new uint[17];
uint num = 0;
for (int index = 1; index <= 16; ++index)
{
num = (uint)((int)num + (int)numArray1[index - 1] << 1);
numArray2[index] = num;
}
uint[] numArray3 = new uint[288];
for (int index = 0; index < this.codeLengthArray.Length; ++index)
{
int codeLength = (int)this.codeLengthArray[index];
if (codeLength > 0)
{
numArray3[index] = FastEncoderStatics.BitReverse(numArray2[codeLength], codeLength);
++numArray2[codeLength];
}
}
return(numArray3);
}
internal static void WriteMatch(int matchLen, int matchPos, OutputBuffer output)
{
Debug.Assert(matchLen >= 3 && matchLen <= 258, "Illegal currentMatch length!");
uint num1 = FastEncoderStatics.FastEncoderLiteralCodeInfo[254 + matchLen];
int n1 = (int)num1 & 31;
Debug.Assert((uint)n1 > 0U, "Invalid Match Length!");
if (n1 <= 16)
{
output.WriteBits(n1, num1 >> 5);
}
else
{
output.WriteBits(16, num1 >> 5 & (uint)ushort.MaxValue);
output.WriteBits(n1 - 16, num1 >> 21);
}
uint num2 = FastEncoderStatics.FastEncoderDistanceCodeInfo[FastEncoderStatics.GetSlot(matchPos)];
output.WriteBits((int)num2 & 15, num2 >> 8);
int n2 = (int)(num2 >> 4) & 15;
if ((uint)n2 <= 0U)
{
return;
}
output.WriteBits(n2, (uint)matchPos & FastEncoderStatics.BitMask[n2]);
}