Bugfix: Off-by-one bug in subtracting UINT. Fixes #1557

2023-05-11 22:49:23 +09:30
parent d6cf8ba90e
commit 5b0e7e5065
2 changed files with 36 additions and 6 deletions
@@ -14,6 +14,7 @@ public class UintUtils {
     * @return diff
     */
    public static long diff(long a, long b, final long UINT_MAX) {
+
        if (a < 0 || b < 0) {
            throw new RuntimeException("a or b cannot be less than zero.");
        }
@@ -25,6 +26,6 @@ public class UintUtils {
            return a - b;
        }

-        return (UINT_MAX - b) + a;
+        return (UINT_MAX + 1 - b) + a;
    }
 }