private unsafe void LoadDistTree()
{
int n, m, p, code;
AcedUtils.Fill(0, _pBitLen, AcedConsts.DistCount);
LoadCharDistLengths(GetNBits(6) + 1);
AcedUtils.Fill(0, _pDistTree, AcedConsts.DistTreeSize);
_pNextCode[1] = 0;
_pNextCode[2] = n = _pBitCount[1] << 1;
_pNextCode[3] = n = (n + _pBitCount[2]) << 1;
_pNextCode[4] = n = (n + _pBitCount[3]) << 1;
_pNextCode[5] = n = (n + _pBitCount[4]) << 1;
_pNextCode[6] = n = (n + _pBitCount[5]) << 1;
_pNextCode[7] = n = (n + _pBitCount[6]) << 1;
_pNextCode[8] = n = (n + _pBitCount[7]) << 1;
_pNextCode[9] = n = (n + _pBitCount[8]) << 1;
_pNextCode[10] = n = (n + _pBitCount[9]) << 1;
_pNextCode[11] = n = (n + _pBitCount[10]) << 1;
_pNextCode[12] = n = (n + _pBitCount[11]) << 1;
_pNextCode[13] = n = (n + _pBitCount[12]) << 1;
_pNextCode[14] = n = (n + _pBitCount[13]) << 1;
int treeLen = 2;
for (int i = 0; i < AcedConsts.DistCount; i++)
{
n = _pBitLen[i];
if (n == 0)
{
continue;
}
m = _pNextCode[n];
code = (int)AcedUtils.ReverseBits((uint)m, n);
_pNextCode[n] = m + 1;
p = 1;
while (true)
{
p += code & 1;
code >>= 1;
n--;
if (n != 0)
{
m = p;
p = _pDistTree[p];
if (p == 0)
{
p = treeLen + 1;
treeLen = p + 1;
_pDistTree[m] = p;
}
}
else
{
_pDistTree[p] = -i;
break;
}
}
}
}
private unsafe void LoadChLenTree()
{
int n, m, p, i, code;
AcedUtils.Fill(0, _pBitCount, AcedConsts.MaxChLenBits + 1);
for (i = 0; i < AcedConsts.ChLenCount; i++)
{
n = GetNBits(3);
_pBitLen[i] = n;
_pBitCount[n]++;
}
AcedUtils.Fill(0, _pChLenTree, AcedConsts.ChLenTreeSize);
_pNextCode[1] = 0;
_pNextCode[2] = n = _pBitCount[1] << 1;
_pNextCode[3] = n = (n + _pBitCount[2]) << 1;
_pNextCode[4] = n = (n + _pBitCount[3]) << 1;
_pNextCode[5] = n = (n + _pBitCount[4]) << 1;
_pNextCode[6] = n = (n + _pBitCount[5]) << 1;
_pNextCode[7] = n = (n + _pBitCount[6]) << 1;
int treeLen = 2;
for (i = 0; i < AcedConsts.ChLenCount; i++)
{
n = _pBitLen[i];
if (n == 0)
{
continue;
}
m = _pNextCode[n];
code = (int)AcedUtils.ReverseBits((uint)m, n);
_pNextCode[n] = m + 1;
p = 1;
while (true)
{
p += code & 1;
code >>= 1;
n--;
if (n != 0)
{
m = p;
p = _pChLenTree[p];
if (p == 0)
{
p = treeLen + 1;
treeLen = p + 1;
_pChLenTree[m] = p;
}
}
else
{
_pChLenTree[p] = -i;
break;
}
}
}
}
private unsafe void LoadCharDistLengths(int count)
{
int c, lastLen = 0;
int *p = _pBitLen;
AcedUtils.Fill(0, _pBitCount, AcedConsts.MaxBits + 1);
while (count > 0)
{
c = GetCode(_pChLenTree);
if (c < 15)
{
*p = c;
_pBitCount[c]++;
p++;
lastLen = c;
count--;
}
else
{
if (c < 17)
{
if (c == 15)
{
c = 2;
}
else
{
c = GetBit() + 3;
}
}
else if (c == 17)
{
c = GetNBits(2) + 5;
}
else if (c == 18)
{
c = GetNBits(3) + 9;
}
else
{
c = GetNBits(7) + 17;
}
count -= c;
_pBitCount[lastLen] += c;
do
{
c--;
*p = lastLen;
p++;
} while (c != 0);
}
}
}
