internal void build_tree(DeflateManager s)
{
short[] array = this.dyn_tree;
short[] treeCodes = this.staticTree.treeCodes;
int elems = this.staticTree.elems;
int num = -1;
s.heap_len = 0;
s.heap_max = ZTree.HEAP_SIZE;
for (int i = 0; i < elems; i++)
{
if (array[i * 2] != 0)
{
num = (s.heap[++s.heap_len] = i);
s.depth[i] = 0;
}
else
{
array[i * 2 + 1] = 0;
}
}
int num2;
while (s.heap_len < 2)
{
num2 = (s.heap[++s.heap_len] = ((num >= 2) ? 0 : (++num)));
array[num2 * 2] = 1;
s.depth[num2] = 0;
s.opt_len--;
if (treeCodes != null)
{
s.static_len -= (int)treeCodes[num2 * 2 + 1];
}
}
this.max_code = num;
for (int i = s.heap_len / 2; i >= 1; i--)
{
s.pqdownheap(array, i);
}
num2 = elems;
do
{
int i = s.heap[1];
s.heap[1] = s.heap[s.heap_len--];
s.pqdownheap(array, 1);
int num3 = s.heap[1];
s.heap[--s.heap_max] = i;
s.heap[--s.heap_max] = num3;
array[num2 * 2] = (short)(array[i * 2] + array[num3 * 2]);
s.depth[num2] = (sbyte)(Math.Max((byte)s.depth[i], (byte)s.depth[num3]) + 1);
array[i * 2 + 1] = (array[num3 * 2 + 1] = (short)num2);
s.heap[1] = num2++;
s.pqdownheap(array, 1);
}while (s.heap_len >= 2);
s.heap[--s.heap_max] = s.heap[1];
this.gen_bitlen(s);
ZTree.gen_codes(array, num, s.bl_count);
}
internal void send_compressed_block(short[] ltree, short[] dtree)
{
int num = 0;
if (this.last_lit != 0)
{
do
{
int num2 = this._distanceOffset + num * 2;
int num3 = ((int)this.pending[num2] << 8 & 65280) | (int)(this.pending[num2 + 1] & byte.MaxValue);
int num4 = (int)(this.pending[this._lengthOffset + num] & byte.MaxValue);
num++;
if (num3 == 0)
{
this.send_code(num4, ltree);
}
else
{
int num5 = (int)ZTree.LengthCode[num4];
this.send_code(num5 + InternalConstants.LITERALS + 1, ltree);
int num6 = ZTree.ExtraLengthBits[num5];
if (num6 != 0)
{
num4 -= ZTree.LengthBase[num5];
this.send_bits(num4, num6);
}
num3--;
num5 = ZTree.DistanceCode(num3);
this.send_code(num5, dtree);
num6 = ZTree.ExtraDistanceBits[num5];
if (num6 != 0)
{
num3 -= ZTree.DistanceBase[num5];
this.send_bits(num3, num6);
}
}
}while (num < this.last_lit);
}
this.send_code(DeflateManager.END_BLOCK, ltree);
this.last_eob_len = (int)ltree[DeflateManager.END_BLOCK * 2 + 1];
}
internal bool _tr_tally(int dist, int lc)
{
this.pending[this._distanceOffset + this.last_lit * 2] = (byte)((uint)dist >> 8);
this.pending[this._distanceOffset + this.last_lit * 2 + 1] = (byte)dist;
this.pending[this._lengthOffset + this.last_lit] = (byte)lc;
this.last_lit++;
if (dist == 0)
{
short[] array = this.dyn_ltree;
int num = lc * 2;
array[num] += 1;
}
else
{
this.matches++;
dist--;
short[] array2 = this.dyn_ltree;
int num2 = ((int)ZTree.LengthCode[lc] + InternalConstants.LITERALS + 1) * 2;
array2[num2] += 1;
short[] array3 = this.dyn_dtree;
int num3 = ZTree.DistanceCode(dist) * 2;
array3[num3] += 1;
}
if ((this.last_lit & 8191) == 0 && this.compressionLevel > CompressionLevel.Level2)
{
int num4 = this.last_lit << 3;
int num5 = this.strstart - this.block_start;
for (int i = 0; i < InternalConstants.D_CODES; i++)
{
num4 = (int)((long)num4 + (long)this.dyn_dtree[i * 2] * (5L + (long)ZTree.ExtraDistanceBits[i]));
}
num4 >>= 3;
if (this.matches < this.last_lit / 2 && num4 < num5 / 2)
{
return(true);
}
}
return(this.last_lit == this.lit_bufsize - 1 || this.last_lit == this.lit_bufsize);
}