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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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63 // Encoder | 63 // Encoder |
64 // ------------------------------------------------------------------------ | 64 // ------------------------------------------------------------------------ |
65 | 65 |
66 /** | 66 /** |
67 * Base64 and base64url encoding converter. | 67 * Base64 and base64url encoding converter. |
68 * | 68 * |
69 * Encodes lists of bytes using base64 or base64url encoding. | 69 * Encodes lists of bytes using base64 or base64url encoding. |
70 * | 70 * |
71 * The results are ASCII strings using a restricted alphabet. | 71 * The results are ASCII strings using a restricted alphabet. |
72 */ | 72 */ |
73 class Base64Encoder extends | 73 class Base64Encoder extends Converter<List<int>, String> { |
74 ChunkedConverter<List<int>, String, List<int>, String> { | |
75 final bool _urlSafe; | 74 final bool _urlSafe; |
76 | 75 |
77 const Base64Encoder() : _urlSafe = false; | 76 const Base64Encoder() : _urlSafe = false; |
78 const Base64Encoder.urlSafe() : _urlSafe = true; | 77 const Base64Encoder.urlSafe() : _urlSafe = true; |
79 | 78 |
80 String convert(List<int> input) { | 79 String convert(List<int> input) { |
81 if (input.isEmpty) return ""; | 80 if (input.isEmpty) return ""; |
82 var encoder = new _Base64Encoder(_urlSafe); | 81 var encoder = new _Base64Encoder(_urlSafe); |
83 Uint8List buffer = encoder.encode(input, 0, input.length, true); | 82 Uint8List buffer = encoder.encode(input, 0, input.length, true); |
84 return new String.fromCharCodes(buffer); | 83 return new String.fromCharCodes(buffer); |
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334 // Decoder | 333 // Decoder |
335 // ------------------------------------------------------------------------ | 334 // ------------------------------------------------------------------------ |
336 | 335 |
337 /** | 336 /** |
338 * Decoder for base64 encoded data. | 337 * Decoder for base64 encoded data. |
339 * | 338 * |
340 * This decoder accepts both base64 and base64url ("url-safe") encodings. | 339 * This decoder accepts both base64 and base64url ("url-safe") encodings. |
341 * | 340 * |
342 * The encoding is required to be properly padded. | 341 * The encoding is required to be properly padded. |
343 */ | 342 */ |
344 class Base64Decoder extends | 343 class Base64Decoder extends Converter<String, List<int>> { |
345 ChunkedConverter<String, List<int>, String, List<int>> { | |
346 | 344 |
347 const Base64Decoder(); | 345 const Base64Decoder(); |
348 | 346 |
349 List<int> convert(String input, [int start = 0, int end]) { | 347 List<int> convert(String input, [int start = 0, int end]) { |
350 end = RangeError.checkValidRange(start, end, input.length); | 348 end = RangeError.checkValidRange(start, end, input.length); |
351 if (start == end) return new Uint8List(0); | 349 if (start == end) return new Uint8List(0); |
352 var decoder = new _Base64Decoder(); | 350 var decoder = new _Base64Decoder(); |
353 Uint8List buffer = decoder.decode(input, start, end); | 351 Uint8List buffer = decoder.decode(input, start, end); |
354 decoder.close(input, end); | 352 decoder.close(input, end); |
355 return buffer; | 353 return buffer; |
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743 end = RangeError.checkValidRange(start, end, string.length); | 741 end = RangeError.checkValidRange(start, end, string.length); |
744 if (start == end) return; | 742 if (start == end) return; |
745 Uint8List buffer = _decoder.decode(string, start, end); | 743 Uint8List buffer = _decoder.decode(string, start, end); |
746 if (buffer != null) _sink.add(buffer); | 744 if (buffer != null) _sink.add(buffer); |
747 if (isLast) { | 745 if (isLast) { |
748 _decoder.close(string, end); | 746 _decoder.close(string, end); |
749 _sink.close(); | 747 _sink.close(); |
750 } | 748 } |
751 } | 749 } |
752 } | 750 } |
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