Index: lib/src/byte_accumulator_sink.dart |
diff --git a/lib/src/byte_accumulator_sink.dart b/lib/src/byte_accumulator_sink.dart |
new file mode 100644 |
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+++ b/lib/src/byte_accumulator_sink.dart |
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+// Copyright (c) 2016, 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. |
+ |
+import 'dart:convert'; |
+import 'dart:typed_data'; |
+ |
+import 'package:typed_data/typed_data.dart'; |
+ |
+/// A sink that provides access to the concatenated bytes passed to it. |
+/// |
+/// See also [ByteConversionSink.withCallback]. |
+class ByteAccumulatorSink extends ByteConversionSinkBase { |
+ /// The bytes accumulated so far. |
+ /// |
+ /// The returned [Uint8List] is viewing a shared buffer, so it should not be |
+ /// changed and any bytes outside the view should not be accessed. |
+ Uint8List get bytes => new Uint8List.view(_buffer.buffer, 0, _buffer.length); |
+ |
+ final _buffer = new Uint8Buffer(); |
+ |
+ /// Whether [close] has been called. |
+ bool get isClosed => _isClosed; |
+ var _isClosed = false; |
+ |
+ /// Removes all bytes from [bytes]. |
+ /// |
+ /// This can be used to avoid double-processing data. |
+ void clear() { |
+ _buffer.clear(); |
+ } |
+ |
+ void add(List<int> bytes) { |
+ if (_isClosed) { |
+ throw new StateError("Can't add to a closed sink."); |
+ } |
+ |
+ _buffer.addAll(bytes); |
+ } |
+ |
+ void addSlice(List<int> chunk, int start, int end, bool isLast) { |
+ if (_isClosed) { |
+ throw new StateError("Can't add to a closed sink."); |
+ } |
+ |
+ _buffer.addAll(chunk, start, end); |
+ if (isLast) _isClosed = true; |
+ } |
+ |
+ void close() { |
+ _isClosed = true; |
+ } |
+} |