Binary assets and more unit tests for Asset.

pkg/barback/lib/src/utils.dart

Index: pkg/barback/lib/src/utils.dart
diff --git a/pkg/barback/lib/src/utils.dart b/pkg/barback/lib/src/utils.dart
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+++ b/pkg/barback/lib/src/utils.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.
+
+library barback.utils;
+
+/// Converts a number in the range [0-255] to a two digit hex string.
+///
+/// For example, given `255`, returns `ff`.
+String byteToHex(int byte) {
+  assert(byte >= 0 && byte < 255);
+
+  const DIGITS = "0123456789abcdef";
+  return DIGITS[(byte ~/ 16) % 16] + DIGITS[byte % 16];
+}