First version of Codecs and Converters.

sdk/lib/convert/utf.dart

Index: sdk/lib/convert/utf.dart
diff --git a/sdk/lib/convert/utf.dart b/sdk/lib/convert/utf.dart
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+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of dart.convert;
+
+/**
+ * A [Utf8Encoder] converts strings to their UTF-8 code units (a list of
+ * unsigned 8-bit integers).
+ */
+class Utf8Encoder extends Converter<String, List<int>> {
+  /**
+   * Converts [string] to its UTF-8 code units (a list of
+   * unsigned 8-bit integers).
+   */
+  List<int> convert(String string) => OLD_UTF_LIB.encodeUtf8(string);
+}
+
+/**
+ * A [Utf8Decoder] converts UTF-8 code units (lists of unsigned 8-bit integers)
+ * to a string.
+ */
+class Utf8Decoder extends Converter<List<int>, String> {
+  /**
+   * Converts the UTF-8 [codeUnits] (a list of unsigned 8-bit integers) to the
+   * corresponding string.
+   */
+  // TODO(floitsch): allow to configure the decoder (for example the replacement
+  // character).
+  String convert(List<int> codeUnits) => OLD_UTF_LIB.decodeUtf8(codeUnits);
+}