Ionic.Zlib.DeflateManager._tr_tally C# (CSharp) Method

        internal bool _tr_tally(int dist, int lc)
        {
            pending[_distanceOffset + last_lit * 2] = unchecked((byte) ( (uint)dist >> 8 ) );
            pending[_distanceOffset + last_lit * 2 + 1] = unchecked((byte)dist);
            pending[_lengthOffset + last_lit] = unchecked((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[(ZTree.LengthCode[lc] + InternalConstants.LITERALS + 1) * 2]++;
                dyn_dtree[ZTree.DistanceCode(dist) * 2]++;
            }

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

            return (last_lit == lit_bufsize - 1) || (last_lit == lit_bufsize);
            // dinoch - wraparound?
            // 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.
        }