public int EndDeflate()
{
if (Dstate == null)
{
throw new ZlibException("No Deflate State!");
}
Dstate = null;
return(ZlibConstants.ZOk);;
}
private int _InternalInitializeDeflate(bool wantRfc1950Header)
{
if (Istate != null)
{
throw new ZlibException("You may not call InitializeDeflate() after calling InitializeInflate().");
}
Dstate = new DeflateManager {
WantRfc1950HeaderBytes = wantRfc1950Header
};
return(Dstate.Initialize(this, CompressLevel, WindowBits, Strategy));
}
internal void Gen_bitlen(DeflateManager s)
{
var tree = DynTree;
var stree = StaticTree.treeCodes;
var extra = StaticTree.extraBits;
var baseRenamed = StaticTree.extraBase;
var maxLength = StaticTree.maxLength;
int h;
int n;
int bits;
var overflow = 0;
for (bits = 0; bits <= InternalConstants.MAX_BITS; bits++)
{
s.BlCount[bits] = 0;
}
tree[s.Heap[s.HeapMax] * 2 + 1] = 0;
for (h = s.HeapMax + 1; h < HeapSize; h++)
{
n = s.Heap[h];
bits = tree[tree[n * 2 + 1] * 2 + 1] + 1;
if (bits > maxLength)
{
bits = maxLength;
overflow++;
}
tree[n * 2 + 1] = (short)bits;
if (n > MaxCode)
{
continue;
}
s.BlCount[bits]++;
var xbits = 0;
if (n >= baseRenamed)
{
xbits = extra[n - baseRenamed];
}
var f = tree[n * 2];
s.OptLen += f * (bits + xbits);
if (stree != null)
{
s.StaticLen += f * (stree[n * 2 + 1] + xbits);
}
}
if (overflow == 0)
{
return;
}
do
{
bits = maxLength - 1;
while (s.BlCount[bits] == 0)
{
bits--;
}
s.BlCount[bits]--;
s.BlCount[bits + 1] = (short)(s.BlCount[bits + 1] + 2);
s.BlCount[maxLength]--;
overflow -= 2;
} while (overflow > 0);
for (bits = maxLength; bits != 0; bits--)
{
n = s.BlCount[bits];
while (n != 0)
{
var m = s.Heap[--h];
if (m > MaxCode)
{
continue;
}
if (tree[m * 2 + 1] != bits)
{
s.OptLen = (int)(s.OptLen + (bits - (long)tree[m * 2 + 1]) * tree[m * 2]);
tree[m * 2 + 1] = (short)bits;
}
n--;
}
}
}
internal void Build_tree(DeflateManager s)
{
var tree = DynTree;
var stree = StaticTree.treeCodes;
var elems = StaticTree.elems;
int n;
var maxCode = -1;
int node;
s.HeapLen = 0;
s.HeapMax = HeapSize;
for (n = 0; n < elems; n++)
{
if (tree[n * 2] != 0)
{
s.Heap[++s.HeapLen] = maxCode = n;
s.Depth[n] = 0;
}
else
{
tree[n * 2 + 1] = 0;
}
}
while (s.HeapLen < 2)
{
node = s.Heap[++s.HeapLen] = maxCode < 2 ? ++maxCode : 0;
tree[node * 2] = 1;
s.Depth[node] = 0;
s.OptLen--;
if (stree != null)
{
s.StaticLen -= stree[node * 2 + 1];
}
}
MaxCode = maxCode;
for (n = s.HeapLen / 2; n >= 1; n--)
{
s.Pqdownheap(tree, n);
}
node = elems;
do
{
n = s.Heap[1];
s.Heap[1] = s.Heap[s.HeapLen--];
s.Pqdownheap(tree, 1);
var m = s.Heap[1];
s.Heap[--s.HeapMax] = n;
s.Heap[--s.HeapMax] = m;
tree[node * 2] = unchecked ((short)(tree[n * 2] + tree[m * 2]));
s.Depth[node] = (sbyte)(Math.Max((byte)s.Depth[n], (byte)s.Depth[m]) + 1);
tree[n * 2 + 1] = tree[m * 2 + 1] = (short)node;
s.Heap[1] = node++;
s.Pqdownheap(tree, 1);
} while (s.HeapLen >= 2);
s.Heap[--s.HeapMax] = s.Heap[1];
Gen_bitlen(s);
Gen_codes(tree, maxCode, s.BlCount);
}