Serialize binary barback assets using typed arrays.

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
index d180137a69544a64035c0da567797df28f426949..ad97460c54facd74633c1d944eb7fc8c35002f98 100644
--- a/pkg/barback/lib/src/utils.dart
+++ b/pkg/barback/lib/src/utils.dart
@@ -5,6 +5,7 @@
 library barback.utils;
 
 import 'dart:async';
+import 'dart:typed_data';
 
 /// A pair of values.
 class Pair<E, F> {
@@ -79,6 +80,15 @@ String byteToHex(int byte) {
   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