1 files changed, 74 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_malformed_utf8.js b/js/xpconnect/tests/unit/test_malformed_utf8.js
new file mode 100644
index 0000000000..8ab4592321
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_malformed_utf8.js
@@ -0,0 +1,74 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// nsIPrefBranch.{getCharPref,setCharPref} uses Latin-1 string, and
+// nsIPrefBranch.{getStringPref,setStringPref} uses UTF-8 string.
+//
+// Mixing them results in unexpected string, but it should perform lossy
+// conversion, and not throw.
+
+const gPrefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
+
+const tests = [
+  // Latin-1 to Latin-1 and UTF-8 to UTF-8 should preserve the string.
+  // Latin-1 to UTF-8 should replace invalid character with REPLACEMENT
+  // CHARACTER.
+  // UTF-8 to Latin1 should return the raw UTF-8 code units.
+
+  // UTF-8 code units sequence without the last unit.
+  //
+  // input, Latin-1 to UTF-8, UTF-8 to Latin-1
+  ["\xC2", "\uFFFD", "\xC3\x82"],
+  ["\xDF", "\uFFFD", "\xC3\x9F"],
+  ["\xE0\xA0", "\uFFFD", "\xC3\xA0\xC2\xA0"],
+  ["\xF0\x90\x80", "\uFFFD", "\xC3\xB0\xC2\x90\xC2\x80"],
+
+  // UTF-8 code units sequence with malformed last unit.
+  //
+  // input, Latin-1 to UTF-8, UTF-8 to Latin-1
+  ["\xC2 ", "\uFFFD ", "\xC3\x82 "],
+  ["\xDF ", "\uFFFD ", "\xC3\x9F "],
+  ["\xE0\xA0 ", "\uFFFD ", "\xC3\xA0\xC2\xA0 "],
+  ["\xF0\x90\x80 ", "\uFFFD ", "\xC3\xB0\xC2\x90\xC2\x80 "],
+
+  // UTF-8 code units without the first unit.
+  //
+  // input, Latin-1 to UTF-8, UTF-8 to Latin-1
+  ["\x80", "\uFFFD", "\xC2\x80"],
+  ["\xBF", "\uFFFD", "\xC2\xBF"],
+  ["\xA0\x80", "\uFFFD\uFFFD", "\xC2\xA0\xC2\x80"],
+  ["\x8F\x80\x80", "\uFFFD\uFFFD\uFFFD", "\xC2\x8F\xC2\x80\xC2\x80"],
+];
+
+add_task(function testLatin1ToLatin1() {
+  for (const [input, ] of tests) {
+    gPrefs.setCharPref("test.malformed_utf8_data", input);
+    const result = gPrefs.getCharPref("test.malformed_utf8_data");
+    Assert.equal(result, input);
+  }
+});
+
+add_task(function testLatin1ToUTF8() {
+  for (const [input, expected] of tests) {
+    gPrefs.setCharPref("test.malformed_utf8_data", input);
+    const result = gPrefs.getStringPref("test.malformed_utf8_data");
+    Assert.equal(result, expected);
+  }
+});
+
+add_task(function testUTF8ToLatin1() {
+  for (const [input, , expected] of tests) {
+    gPrefs.setStringPref("test.malformed_utf8_data", input);
+    const result = gPrefs.getCharPref("test.malformed_utf8_data");
+    Assert.equal(result, expected);
+  }
+});
+
+add_task(function testUTF8ToUTF8() {
+  for (const [input, ] of tests) {
+    gPrefs.setStringPref("test.malformed_utf8_data", input);
+    const result = gPrefs.getStringPref("test.malformed_utf8_data");
+    Assert.equal(result, input);
+  }
+});