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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 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 | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 part of dart.convert; | 5 part of dart.convert; |
6 | 6 |
7 /** | 7 /** |
8 * A [base64](https://tools.ietf.org/html/rfc4648) encoder and decoder. | 8 * A [base64](https://tools.ietf.org/html/rfc4648) encoder and decoder. |
9 * | 9 * |
10 * It encodes using the default base64 alphabet, | 10 * It encodes using the default base64 alphabet, |
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198 // Encoder | 198 // Encoder |
199 // ------------------------------------------------------------------------ | 199 // ------------------------------------------------------------------------ |
200 | 200 |
201 /** | 201 /** |
202 * Base64 and base64url encoding converter. | 202 * Base64 and base64url encoding converter. |
203 * | 203 * |
204 * Encodes lists of bytes using base64 or base64url encoding. | 204 * Encodes lists of bytes using base64 or base64url encoding. |
205 * | 205 * |
206 * The results are ASCII strings using a restricted alphabet. | 206 * The results are ASCII strings using a restricted alphabet. |
207 */ | 207 */ |
208 class Base64Encoder extends Converter<List<int>, String> | 208 class Base64Encoder extends Converter<List<int>, String> { |
209 implements ChunkedConverter<List<int>, String, List<int>, String> { | |
210 final bool _urlSafe; | 209 final bool _urlSafe; |
211 | 210 |
212 const Base64Encoder() : _urlSafe = false; | 211 const Base64Encoder() : _urlSafe = false; |
213 const Base64Encoder.urlSafe() : _urlSafe = true; | 212 const Base64Encoder.urlSafe() : _urlSafe = true; |
214 | 213 |
215 String convert(List<int> input) { | 214 String convert(List<int> input) { |
216 if (input.isEmpty) return ""; | 215 if (input.isEmpty) return ""; |
217 var encoder = new _Base64Encoder(_urlSafe); | 216 var encoder = new _Base64Encoder(_urlSafe); |
218 Uint8List buffer = encoder.encode(input, 0, input.length, true); | 217 Uint8List buffer = encoder.encode(input, 0, input.length, true); |
219 return new String.fromCharCodes(buffer); | 218 return new String.fromCharCodes(buffer); |
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458 // Decoder | 457 // Decoder |
459 // ------------------------------------------------------------------------ | 458 // ------------------------------------------------------------------------ |
460 | 459 |
461 /** | 460 /** |
462 * Decoder for base64 encoded data. | 461 * Decoder for base64 encoded data. |
463 * | 462 * |
464 * This decoder accepts both base64 and base64url ("url-safe") encodings. | 463 * This decoder accepts both base64 and base64url ("url-safe") encodings. |
465 * | 464 * |
466 * The encoding is required to be properly padded. | 465 * The encoding is required to be properly padded. |
467 */ | 466 */ |
468 class Base64Decoder extends Converter<String, List<int>> | 467 class Base64Decoder extends Converter<String, List<int>> { |
469 implements ChunkedConverter<String, List<int>, String, List<int>> { | |
470 const Base64Decoder(); | 468 const Base64Decoder(); |
471 | 469 |
472 List<int> convert(String input, [int start = 0, int end]) { | 470 List<int> convert(String input, [int start = 0, int end]) { |
473 end = RangeError.checkValidRange(start, end, input.length); | 471 end = RangeError.checkValidRange(start, end, input.length); |
474 if (start == end) return new Uint8List(0); | 472 if (start == end) return new Uint8List(0); |
475 var decoder = new _Base64Decoder(); | 473 var decoder = new _Base64Decoder(); |
476 Uint8List buffer = decoder.decode(input, start, end); | 474 Uint8List buffer = decoder.decode(input, start, end); |
477 decoder.close(input, end); | 475 decoder.close(input, end); |
478 return buffer; | 476 return buffer; |
479 } | 477 } |
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864 end = RangeError.checkValidRange(start, end, string.length); | 862 end = RangeError.checkValidRange(start, end, string.length); |
865 if (start == end) return; | 863 if (start == end) return; |
866 Uint8List buffer = _decoder.decode(string, start, end); | 864 Uint8List buffer = _decoder.decode(string, start, end); |
867 if (buffer != null) _sink.add(buffer); | 865 if (buffer != null) _sink.add(buffer); |
868 if (isLast) { | 866 if (isLast) { |
869 _decoder.close(string, end); | 867 _decoder.close(string, end); |
870 _sink.close(); | 868 _sink.close(); |
871 } | 869 } |
872 } | 870 } |
873 } | 871 } |
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