| // Copyright (c) 2015, 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 'encoder.dart'; |
| |
| /// This is deprecated. |
| /// |
| /// Use the `Base64Encoder` class in `dart:convert` instead. |
| @Deprecated("Will be removed in crypto 1.0.0.") |
| class Base64EncoderSink extends ChunkedConversionSink<List<int>> { |
| /// The encoder used to encode each chunk. |
| final Base64Encoder _encoder; |
| |
| /// The underlying sink to which to emit the encoded strings. |
| final ChunkedConversionSink<String> _outSink; |
| |
| /// The buffer of as-yet-unconverted bytes. |
| /// |
| /// This is used to ensure that we don't generate interstitial padding |
| /// characters. |
| final _buffer = new List<int>(); |
| |
| /// The length of [_buffer]; that is, the number of unconverted bytes. |
| var _bufferCount = 0; |
| |
| Base64EncoderSink(this._outSink, urlSafe, addLineSeparator) |
| : _encoder = new Base64Encoder( |
| urlSafe: urlSafe, addLineSeparator: addLineSeparator); |
| |
| void add(List<int> chunk) { |
| var nextBufferCount = (chunk.length + _bufferCount) % 3; |
| var decodableLength = _bufferCount + chunk.length - nextBufferCount; |
| |
| if (_bufferCount + chunk.length > _buffer.length) { |
| _buffer.replaceRange(_bufferCount, _buffer.length, |
| chunk.sublist(0, _buffer.length - _bufferCount)); |
| _buffer.addAll(chunk.sublist(_buffer.length - _bufferCount)); |
| } else { |
| _buffer.replaceRange(_bufferCount, _bufferCount + chunk.length, chunk); |
| } |
| |
| _outSink.add(_encoder.convert(_buffer, 0, decodableLength)); |
| _buffer.removeRange(0, decodableLength); |
| _bufferCount = nextBufferCount; |
| } |
| |
| void close() { |
| if (_bufferCount > 0) { |
| _outSink.add(_encoder.convert(_buffer.sublist(0, _bufferCount))); |
| } |
| _outSink.close(); |
| } |
| } |
| |