Serialize binary barback assets using typed arrays.

pkg/barback/lib/src/utils.dart

 // 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;
 
 import 'dart:async';
+import 'dart:typed_data';
 
 /// A pair of values.
 class Pair<E, F> {
   E first;
   F last;
 
   Pair(this.first, this.last);
 
   String toString() => '($first, $last)';
 
@@ skipping 54 matching lines @@
 /// 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];
 }
 
+/// Converts [input] into a [Uint8List].
+///
+/// If [input] is a [TypedData], this just returns a view on [input].
+Uint8List toUint8List(List<int> input) {
+  if (input is Uint8List) return input;
+  if (input is TypedData) return new Uint8List.view(input.buffer);
+  return new Uint8List.fromList(input);
+}
+
 /// Group the elements in [iter] by the value returned by [fn].
 ///
 /// This returns a map whose keys are the return values of [fn] and whose values
 /// are lists of each element in [iter] for which [fn] returned that key.
 Map<Object, List> groupBy(Iterable iter, fn(element)) {
   var map = {};
   for (var element in iter) {
     var list = map.putIfAbsent(fn(element), () => []);
     list.add(element);
   }
@@ skipping 146 matching lines @@
     subscription = callback().listen(controller.add,
         onError: controller.addError,
         onDone: controller.close);
   },
       onCancel: () => subscription.cancel(),
       onPause: () => subscription.pause(),
       onResume: () => subscription.resume(),
       sync: true);
   return controller.stream;
 }