Add base64 decoder and change existing base64 encoder.

tests/lib/crypto/base64_test.dart

Index: tests/lib/crypto/base64_test.dart
diff --git a/tests/lib/crypto/base64_test.dart b/tests/lib/crypto/base64_test.dart
index 0070a50666be48e41f373caf5fc4622308670fad..699c8d8541c1addb4cecdd2dd33b2950a59d3397 100644
--- a/tests/lib/crypto/base64_test.dart
+++ b/tests/lib/crypto/base64_test.dart
@@ -43,13 +43,61 @@ var longLineResultNoBreak =
     "ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm"
     "5hbCBwbGVhc3VyZS4=";
 
-void main() {
+void testEncoder() {
   for (var i = 0; i < inputs.length; i++) {
     var enc = CryptoUtils.bytesToBase64(inputs[i].codeUnits);
     Expect.equals(results[i], enc);
   }
-  Expect.equals(CryptoUtils.bytesToBase64(longLine.codeUnits, 76),
+  Expect.equals(CryptoUtils.bytesToBase64(longLine.codeUnits, addLineSeparator : true),
                 longLineResult);
   Expect.equals(CryptoUtils.bytesToBase64(longLine.codeUnits),
                 longLineResultNoBreak);
 }
+
+void testDecoder() {
+  for (var i = 0; i < results.length; i++) {
+    List<int> dec = CryptoUtils.base64StringToBytes(results[i]);
+    Expect.equals(inputs[i], new String.fromCharCodes(dec));
+  }
+  var longLineDecoded = CryptoUtils.base64StringToBytes(longLineResult);
+  Expect.equals(new String.fromCharCodes(longLineDecoded), longLine);
+  var longLineResultNoBreak = CryptoUtils.base64StringToBytes(longLineResult);
+  Expect.equals(new String.fromCharCodes(longLineResultNoBreak), longLine);
+}
+
+void testDecoderForMalformedInput() {
+  try {
+    CryptoUtils.base64StringToBytes("AB~", ignoreErrors : false);
+    Expect.fail("Should have failed on Malformed input.");
+  } on FormatException catch(e) {
+    // pass
+  }
+  try {
+    // Missing padding.
+    CryptoUtils.base64StringToBytes("Zg=", ignoreErrors : false);
+    Expect.fail("Should have failed on Malformed input.");
+  } on FormatException catch(e) {
+    // pass
+  }
+}
+
+void testEncodeDecode() {
+  for (int i = 0; i < 10; i++) {
+    for (int j = 0; j < 256 - i; j++) {
+      List<int> x = new List<int>(i);
+      for (int k = 0; k < i; k++) {
+        x[k] = j;
+      }
+      var enc = CryptoUtils.bytesToBase64(x);
+      var dec = CryptoUtils.base64StringToBytes(enc);
+      Expect.listEquals(x, dec);
+    }
+  }
+}
+
+void main() {
+  testEncoder();
+  testDecoder();
+  testDecoderForMalformedInput();
+  testEncodeDecode();

[Lasse Reichstein Nielsen, 2013/03/22 09:16:56]

Add tests for url-safe and ignoreErrors too.

[mdakin1, 2013/03/25 17:05:02]

Done.

+}