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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, 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 swarmlib; | 5 part of swarmlib; |
| 6 | 6 |
| 7 // TODO(jimhug): Fill out methods, add encoder, move to shared lib. | 7 // TODO(jimhug): Fill out methods, add encoder, move to shared lib. |
| 8 class Decoder { | 8 class Decoder { |
| 9 int index; | 9 int index; |
| 10 String data; | 10 String data; |
| 11 | 11 |
| 12 Decoder(this.data) { | 12 Decoder(this.data) { |
| 13 this.index = 0; | 13 this.index = 0; |
| 14 } | 14 } |
| 15 | 15 |
| 16 // Reads numbers in variable-length 7-bit encoding. This matches the | 16 // Reads numbers in variable-length 7-bit encoding. This matches the |
| 17 // varint encoding used by protobufs except that it only uses 7 | 17 // varint encoding used by protobufs except that it only uses 7 |
| 18 // bits per byte so it can be efficiently passed as UTF8. | 18 // bits per byte so it can be efficiently passed as UTF8. |
| 19 // For more info, see appengine/encoder.py. | 19 // For more info, see appengine/encoder.py. |
| 20 int readInt() { | 20 int readInt() { |
| 21 var r = 0; | 21 var r = 0; |
| 22 for (var i=0; ; i++) { | 22 for (var i = 0;; i++) { |
| 23 var v = data.codeUnitAt(index++); | 23 var v = data.codeUnitAt(index++); |
| 24 r |= (v & 0x3F) << (6 * i); | 24 r |= (v & 0x3F) << (6 * i); |
| 25 if ((v & 0x40) == 0) break; | 25 if ((v & 0x40) == 0) break; |
| 26 } | 26 } |
| 27 return r.toInt(); | 27 return r.toInt(); |
| 28 } | 28 } |
| 29 | 29 |
| 30 bool readBool() { | 30 bool readBool() { |
| 31 final ch = data[index++]; | 31 final ch = data[index++]; |
| 32 assert (ch == 'T' || ch == 'F'); | 32 assert(ch == 'T' || ch == 'F'); |
| 33 return ch == 'T'; | 33 return ch == 'T'; |
| 34 } | 34 } |
| 35 | 35 |
| 36 String readString() { | 36 String readString() { |
| 37 int len = readInt(); | 37 int len = readInt(); |
| 38 String s = data.substring(index, index+len); | 38 String s = data.substring(index, index + len); |
| 39 index += len; | 39 index += len; |
| 40 return s; | 40 return s; |
| 41 } | 41 } |
| 42 } | 42 } |
| 43 | |
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