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| 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 library byte_stream; | |
| 6 | |
| 7 import 'dart:async'; | |
| 8 import 'dart:convert'; | |
| 9 import 'dart:typed_data'; | |
| 10 | |
| 11 import 'utils.dart'; | |
| 12 | |
| 13 /// A stream of chunks of bytes representing a single piece of data. | |
| 14 class ByteStream extends StreamView<List<int>> { | |
| 15 ByteStream(Stream<List<int>> stream) | |
| 16 : super(stream); | |
| 17 | |
| 18 /// Returns a single-subscription byte stream that will emit the given bytes | |
| 19 /// in a single chunk. | |
| 20 factory ByteStream.fromBytes(List<int> bytes) => | |
| 21 new ByteStream(streamFromIterable([bytes])); | |
| 22 | |
| 23 /// Collects the data of this stream in a [Uint8List]. | |
| 24 Future<Uint8List> toBytes() { | |
| 25 var completer = new Completer(); | |
| 26 var sink = new ByteConversionSink.withCallback((bytes) => | |
| 27 completer.complete(new Uint8List.fromList(bytes))); | |
| 28 listen(sink.add, onError: completer.completeError, onDone: sink.close, | |
| 29 cancelOnError: true); | |
| 30 return completer.future; | |
| 31 } | |
| 32 | |
| 33 /// Collect the data of this stream in a [String], decoded according to | |
| 34 /// [encoding], which defaults to `UTF8`. | |
| 35 Future<String> bytesToString([Encoding encoding=UTF8]) => | |
| 36 encoding.decodeStream(this); | |
| 37 | |
| 38 Stream<String> toStringStream([Encoding encoding=UTF8]) => | |
| 39 transform(encoding.decoder); | |
| 40 } | |
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