Fix file buffering code that uses RemoveRange on a fixed-length Uint8 array.

runtime/bin/file_impl.dart

Index: runtime/bin/file_impl.dart
diff --git a/runtime/bin/file_impl.dart b/runtime/bin/file_impl.dart
index bc83f38cb885d594b20f1d82d7d68257e00da57f..682c2ea3657138676fd31325b43ba5d0b5e320d4 100644
--- a/runtime/bin/file_impl.dart
+++ b/runtime/bin/file_impl.dart
@@ -72,7 +72,9 @@ class _FileInputStream extends _BaseDataInputStream implements InputStream {
     future.then((read) {
       _filePosition += read;
       if (read != _data.length) {
-        _data.removeRange(read, _data.length - read);
+        var oldData = _data;

[Anders Johnsen, 2012/06/12 13:42:33]

What about
 _data = _data.getRange(0, read);

[Bill Hesse, 2012/06/12 13:47:45]

I don't know if that would be a Uint8List.  Since a Uint8List is a different
type of thing than a List, I
don't want to return things of different types.

[Anders Johnsen, 2012/06/12 13:51:24]

.getRange() is a object of same type (see runtime/lib/byte_array.dart), using a
native call to copy into the new list. It should be fairly safe to use here. In
the end, the result will be the same, so I'll leave it up to you.

+        _data = new Uint8List(read);
+        _data.fillRange(0, read, oldData, 0);
       }
       _position = 0;