System.util.zlib.Deflate._tr_tally C# (CSharp) Méthode

        internal bool _tr_tally (int dist, // distance of matched string
            int lc // match length-MIN_MATCH or unmatched char (if dist==0)
            ){

            pending_buf[d_buf+last_lit*2] = (byte)(dist>>8);
            pending_buf[d_buf+last_lit*2+1] = (byte)dist;

            pending_buf[l_buf+last_lit] = (byte)lc; last_lit++;

            if (dist == 0) {
                // lc is the unmatched char
                dyn_ltree[lc*2]++;
            } 
            else {
                matches++;
                // Here, lc is the match length - MIN_MATCH
                dist--;             // dist = match distance - 1
                dyn_ltree[(Tree._length_code[lc]+LITERALS+1)*2]++;
                dyn_dtree[Tree.d_code(dist)*2]++;
            }

            if ((last_lit & 0x1fff) == 0 && level > 2) {
                // Compute an upper bound for the compressed length
                int out_length = last_lit*8;
                int in_length = strstart - block_start;
                int dcode;
                for (dcode = 0; dcode < D_CODES; dcode++) {
                    out_length += (int)((int)dyn_dtree[dcode*2] *
                        (5L+Tree.extra_dbits[dcode]));
                }
                out_length >>= 3;
                if ((matches < (last_lit/2)) && out_length < in_length/2) return true;
            }

            return (last_lit == lit_bufsize-1);
            // We avoid equality with lit_bufsize because of wraparound at 64K
            // on 16 bit machines and because stored blocks are restricted to
            // 64K-1 bytes.
        }