internal void _InitializeBlocks()
{
// Initialize the trees.
for (int i = 0; i < L_CODES; i++)
dyn_ltree [i * 2] = 0;
for (int i = 0; i < D_CODES; i++)
dyn_dtree [i * 2] = 0;
for (int i = 0; i < BL_CODES; i++)
bl_tree [i * 2] = 0;
dyn_ltree [END_BLOCK * 2] = 1;
opt_len = static_len = 0;
last_lit = matches = 0;
}