private void BuildTree(byte[] codeLengths)
{
int[] array = new int[16];
int[] array2 = new int[16];
foreach (int num in codeLengths)
{
if (num > 0)
{
array[num]++;
}
}
int num2 = 0;
int num3 = 512;
for (int j = 1; j <= 15; j++)
{
array2[j] = num2;
num2 += array[j] << 16 - j;
if (j >= 10)
{
int num4 = array2[j] & 130944;
int num5 = num2 & 130944;
num3 += num5 - num4 >> 16 - j;
}
}
this.tree = new short[num3];
int num6 = 512;
for (int k = 15; k >= 10; k--)
{
int num7 = num2 & 130944;
num2 -= array[k] << 16 - k;
int num8 = num2 & 130944;
for (int l = num8; l < num7; l += 128)
{
this.tree[(int)DeflaterHuffman.BitReverse(l)] = (short)(-num6 << 4 | k);
num6 += 1 << k - 9;
}
}
for (int m = 0; m < codeLengths.Length; m++)
{
int num9 = (int)codeLengths[m];
if (num9 != 0)
{
num2 = array2[num9];
int num10 = (int)DeflaterHuffman.BitReverse(num2);
if (num9 <= 9)
{
do
{
this.tree[num10] = (short)(m << 4 | num9);
num10 += 1 << num9;
}while (num10 < 512);
}
else
{
int num11 = (int)this.tree[num10 & 511];
int num12 = 1 << (num11 & 15);
num11 = -(num11 >> 4);
do
{
this.tree[num11 | num10 >> 9] = (short)(m << 4 | num9);
num10 += 1 << num9;
}while (num10 < num12);
}
array2[num9] = num2 + (1 << 16 - num9);
}
}
}
void BuildTree(byte[] codeLengths)
{
int[] blCount = new int[MAX_BITLEN + 1];
int[] nextCode = new int[MAX_BITLEN + 1];
for (int i = 0; i < codeLengths.Length; i++)
{
int bits = codeLengths[i];
if (bits > 0)
{
blCount[bits]++;
}
}
int code = 0;
int treeSize = 512;
for (int bits = 1; bits <= MAX_BITLEN; bits++)
{
nextCode[bits] = code;
code += blCount[bits] << (16 - bits);
if (bits >= 10)
{
/* We need an extra table for bit lengths >= 10. */
int start = nextCode[bits] & 0x1ff80;
int end = code & 0x1ff80;
treeSize += (end - start) >> (16 - bits);
}
}
/* -jr comment this out! doesnt work for dynamic trees and pkzip 2.04g
* if (code != 65536)
* {
* throw new SharpZipBaseException("Code lengths don't add up properly.");
* }
*/
/* Now create and fill the extra tables from longest to shortest
* bit len. This way the sub trees will be aligned.
*/
tree = new short[treeSize];
int treePtr = 512;
for (int bits = MAX_BITLEN; bits >= 10; bits--)
{
int end = code & 0x1ff80;
code -= blCount[bits] << (16 - bits);
int start = code & 0x1ff80;
for (int i = start; i < end; i += 1 << 7)
{
tree[DeflaterHuffman.BitReverse(i)] = (short)((-treePtr << 4) | bits);
treePtr += 1 << (bits - 9);
}
}
for (int i = 0; i < codeLengths.Length; i++)
{
int bits = codeLengths[i];
if (bits == 0)
{
continue;
}
code = nextCode[bits];
int revcode = DeflaterHuffman.BitReverse(code);
if (bits <= 9)
{
do
{
tree[revcode] = (short)((i << 4) | bits);
revcode += 1 << bits;
} while (revcode < 512);
}
else
{
int subTree = tree[revcode & 511];
int treeLen = 1 << (subTree & 15);
subTree = -(subTree >> 4);
do
{
tree[subTree | (revcode >> 9)] = (short)((i << 4) | bits);
revcode += 1 << bits;
} while (revcode < treeLen);
}
nextCode[bits] = code + (1 << (16 - bits));
}
}