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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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