if (base_size < MINIMUM_BREAK_SIZE)
                return 0; /* we do not break too small filepair */
 
-       if (diffcore_count_changes(src->data, src->size,
-                                  dst->data, dst->size,
+       if (diffcore_count_changes(src, dst,
                                   NULL, NULL,
                                   0,
                                   &src_copied, &literal_added))
         * merge the surviving pair together if the score is
         * less than the minimum, after rename/copy runs.
         */
-       *merge_score_p = src_removed * MAX_SCORE / src->size;
+       *merge_score_p = (int)(src_removed * MAX_SCORE / src->size);
 
        /* Extent of damage, which counts both inserts and
         * deletes.