undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/lang/Character/Latin1CaseConversion.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2023, 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * @test
+ * @bug 8302877
+ * @summary Provides exhaustive verification of Character.toUpperCase and Character.toLowerCase
+ * for all code points in the latin1 range 0-255.
+ * @run junit Latin1CaseConversion
+ */
+public class Latin1CaseConversion {
+
+    @Test
+    public void shouldUpperCaseAndLowerCaseLatin1() {
+        for (int c = 0; c < 256; c++) {
+            int upper = Character.toUpperCase(c);
+            int lower = Character.toLowerCase(c);
+
+            if (c < 0x41) { // Before A
+                assertUnchanged(upper, lower, c);
+            } else if (c <= 0x5A) { // A-Z
+                assertEquals(c, upper);
+                assertEquals(c + 32, lower);
+            } else if (c < 0x61) { // Between Z and a
+                assertUnchanged(upper, lower, c);
+            } else if (c <= 0x7A) { // a-z
+                assertEquals(c - 32, upper);
+                assertEquals(c, lower);
+            } else if (c < 0xB5) { // Between z and Micro Sign
+                assertUnchanged(upper, lower, c);
+            } else if (c == 0xB5) { // Special case for Micro Sign
+                assertEquals(0x39C, upper);
+                assertEquals(c, lower);
+            } else if (c < 0xC0) { // Between my and A-grave
+                assertUnchanged(upper, lower, c);
+            } else if (c < 0xD7) { // A-grave - O with Diaeresis
+                assertEquals(c, upper);
+                assertEquals(c + 32, lower);
+            } else if (c == 0xD7) { // Multiplication
+                assertUnchanged(upper, lower, c);
+            } else if (c <= 0xDE) { // O with slash - Thorn
+                assertEquals(c, upper);
+                assertEquals(c + 32, lower);
+            } else if (c == 0xDF) { // Sharp s
+                assertUnchanged(upper, lower, c);
+            } else if (c < 0xF7) { // a-grave - divsion
+                assertEquals(c - 32, upper);
+                assertEquals(c, lower);
+            } else if (c == 0xF7) { // Division
+                assertUnchanged(upper, lower, c);
+            } else if (c < 0xFF) { // o with slash - thorn
+                assertEquals(c - 32, upper);
+                assertEquals(c, lower);
+            } else if (c == 0XFF) { // Special case for y with Diaeresis
+                assertEquals(0x178, upper);
+                assertEquals(c, lower);
+            } else {
+                fail("Uncovered code point: " + Integer.toHexString(c));
+            }
+        }
+    }
+
+    private static void assertUnchanged(int upper, int lower, int c) {
+        assertEquals(c, upper);
+        assertEquals(c, lower);
+    }
+}