A couple of tweaks

backward_references_hq.go

@@ -502,7 +502,9 @@ func updateNodes(num_bytes uint, block_start uint, pos uint, ringbuffer []byte,
 					var cost float32 = dist_cost + float32(getCopyExtra(copycode)) + zopfliCostModelGetCommandCost(model, cmdcode)
 					if cost < nodes[pos+len].u.cost {
 						updateZopfliNode(nodes, pos, start, uint(len), len_code, dist, 0, cost)
-						result = brotli_max_size_t(result, uint(len))
+						if len > result {
+							result = len
+						}
 					}
 				}
 			}

find_match_length.go

@@ -9,6 +9,7 @@ package brotli
 /* Function to find maximal matching prefixes of strings. */
 func findMatchLengthWithLimit(s1 []byte, s2 []byte, limit uint) uint {
 	var matched uint = 0
+	_, _ = s1[limit-1], s2[limit-1] // bounds check
 	for matched < limit && s1[matched] == s2[matched] {
 		matched++
 	}