| // 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; |
| } |
| } |