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1 // Copyright (c) 2015, 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 import 'dart:convert'; | |
6 | |
7 import 'encoder.dart'; | |
8 | |
9 /// This is deprecated. | |
10 /// | |
11 /// Use the `Base64Encoder` class in `dart:convert` instead. | |
12 @Deprecated("Will be removed in crypto 1.0.0.") | |
13 class Base64EncoderSink extends ChunkedConversionSink<List<int>> { | |
14 /// The encoder used to encode each chunk. | |
15 final Base64Encoder _encoder; | |
16 | |
17 /// The underlying sink to which to emit the encoded strings. | |
18 final ChunkedConversionSink<String> _outSink; | |
19 | |
20 /// The buffer of as-yet-unconverted bytes. | |
21 /// | |
22 /// This is used to ensure that we don't generate interstitial padding | |
23 /// characters. | |
24 final _buffer = new List<int>(); | |
25 | |
26 /// The length of [_buffer]; that is, the number of unconverted bytes. | |
27 var _bufferCount = 0; | |
28 | |
29 Base64EncoderSink(this._outSink, urlSafe, addLineSeparator) | |
30 : _encoder = new Base64Encoder( | |
31 urlSafe: urlSafe, addLineSeparator: addLineSeparator); | |
32 | |
33 void add(List<int> chunk) { | |
34 var nextBufferCount = (chunk.length + _bufferCount) % 3; | |
35 var decodableLength = _bufferCount + chunk.length - nextBufferCount; | |
36 | |
37 if (_bufferCount + chunk.length > _buffer.length) { | |
38 _buffer.replaceRange(_bufferCount, _buffer.length, | |
39 chunk.sublist(0, _buffer.length - _bufferCount)); | |
40 _buffer.addAll(chunk.sublist(_buffer.length - _bufferCount)); | |
41 } else { | |
42 _buffer.replaceRange(_bufferCount, _bufferCount + chunk.length, chunk); | |
43 } | |
44 | |
45 _outSink.add(_encoder.convert(_buffer, 0, decodableLength)); | |
46 _buffer.removeRange(0, decodableLength); | |
47 _bufferCount = nextBufferCount; | |
48 } | |
49 | |
50 void close() { | |
51 if (_bufferCount > 0) { | |
52 _outSink.add(_encoder.convert(_buffer.sublist(0, _bufferCount))); | |
53 } | |
54 _outSink.close(); | |
55 } | |
56 } | |
57 | |
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