| 1 | n/a | #!/usr/bin/env python |
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| 2 | n/a | """ Python Character Mapping Codec for ROT13. |
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| 3 | n/a | |
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| 4 | n/a | This codec de/encodes from str to str. |
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| 5 | n/a | |
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| 6 | n/a | Written by Marc-Andre Lemburg (mal@lemburg.com). |
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| 7 | n/a | """ |
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| 8 | n/a | |
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| 9 | n/a | import codecs |
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| 10 | n/a | |
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| 11 | n/a | ### Codec APIs |
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| 12 | n/a | |
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| 13 | n/a | class Codec(codecs.Codec): |
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| 14 | n/a | def encode(self, input, errors='strict'): |
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| 15 | n/a | return (input.translate(rot13_map), len(input)) |
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| 16 | n/a | |
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| 17 | n/a | def decode(self, input, errors='strict'): |
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| 18 | n/a | return (input.translate(rot13_map), len(input)) |
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| 19 | n/a | |
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| 20 | n/a | class IncrementalEncoder(codecs.IncrementalEncoder): |
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| 21 | n/a | def encode(self, input, final=False): |
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| 22 | n/a | return input.translate(rot13_map) |
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| 23 | n/a | |
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| 24 | n/a | class IncrementalDecoder(codecs.IncrementalDecoder): |
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| 25 | n/a | def decode(self, input, final=False): |
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| 26 | n/a | return input.translate(rot13_map) |
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| 27 | n/a | |
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| 28 | n/a | class StreamWriter(Codec,codecs.StreamWriter): |
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| 29 | n/a | pass |
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| 30 | n/a | |
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| 31 | n/a | class StreamReader(Codec,codecs.StreamReader): |
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| 32 | n/a | pass |
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| 33 | n/a | |
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| 34 | n/a | ### encodings module API |
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| 35 | n/a | |
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| 36 | n/a | def getregentry(): |
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| 37 | n/a | return codecs.CodecInfo( |
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| 38 | n/a | name='rot-13', |
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| 39 | n/a | encode=Codec().encode, |
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| 40 | n/a | decode=Codec().decode, |
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| 41 | n/a | incrementalencoder=IncrementalEncoder, |
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| 42 | n/a | incrementaldecoder=IncrementalDecoder, |
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| 43 | n/a | streamwriter=StreamWriter, |
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| 44 | n/a | streamreader=StreamReader, |
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| 45 | n/a | _is_text_encoding=False, |
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| 46 | n/a | ) |
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| 47 | n/a | |
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| 48 | n/a | ### Map |
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| 49 | n/a | |
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| 50 | n/a | rot13_map = codecs.make_identity_dict(range(256)) |
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| 51 | n/a | rot13_map.update({ |
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| 52 | n/a | 0x0041: 0x004e, |
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| 53 | n/a | 0x0042: 0x004f, |
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| 54 | n/a | 0x0043: 0x0050, |
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| 55 | n/a | 0x0044: 0x0051, |
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| 56 | n/a | 0x0045: 0x0052, |
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| 57 | n/a | 0x0046: 0x0053, |
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| 58 | n/a | 0x0047: 0x0054, |
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| 59 | n/a | 0x0048: 0x0055, |
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| 60 | n/a | 0x0049: 0x0056, |
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| 61 | n/a | 0x004a: 0x0057, |
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| 62 | n/a | 0x004b: 0x0058, |
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| 63 | n/a | 0x004c: 0x0059, |
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| 64 | n/a | 0x004d: 0x005a, |
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| 65 | n/a | 0x004e: 0x0041, |
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| 66 | n/a | 0x004f: 0x0042, |
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| 67 | n/a | 0x0050: 0x0043, |
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| 68 | n/a | 0x0051: 0x0044, |
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| 69 | n/a | 0x0052: 0x0045, |
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| 70 | n/a | 0x0053: 0x0046, |
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| 71 | n/a | 0x0054: 0x0047, |
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| 72 | n/a | 0x0055: 0x0048, |
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| 73 | n/a | 0x0056: 0x0049, |
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| 74 | n/a | 0x0057: 0x004a, |
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| 75 | n/a | 0x0058: 0x004b, |
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| 76 | n/a | 0x0059: 0x004c, |
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| 77 | n/a | 0x005a: 0x004d, |
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| 78 | n/a | 0x0061: 0x006e, |
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| 79 | n/a | 0x0062: 0x006f, |
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| 80 | n/a | 0x0063: 0x0070, |
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| 81 | n/a | 0x0064: 0x0071, |
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| 82 | n/a | 0x0065: 0x0072, |
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| 83 | n/a | 0x0066: 0x0073, |
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| 84 | n/a | 0x0067: 0x0074, |
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| 85 | n/a | 0x0068: 0x0075, |
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| 86 | n/a | 0x0069: 0x0076, |
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| 87 | n/a | 0x006a: 0x0077, |
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| 88 | n/a | 0x006b: 0x0078, |
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| 89 | n/a | 0x006c: 0x0079, |
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| 90 | n/a | 0x006d: 0x007a, |
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| 91 | n/a | 0x006e: 0x0061, |
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| 92 | n/a | 0x006f: 0x0062, |
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| 93 | n/a | 0x0070: 0x0063, |
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| 94 | n/a | 0x0071: 0x0064, |
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| 95 | n/a | 0x0072: 0x0065, |
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| 96 | n/a | 0x0073: 0x0066, |
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| 97 | n/a | 0x0074: 0x0067, |
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| 98 | n/a | 0x0075: 0x0068, |
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| 99 | n/a | 0x0076: 0x0069, |
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| 100 | n/a | 0x0077: 0x006a, |
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| 101 | n/a | 0x0078: 0x006b, |
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| 102 | n/a | 0x0079: 0x006c, |
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| 103 | n/a | 0x007a: 0x006d, |
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| 104 | n/a | }) |
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| 105 | n/a | |
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| 106 | n/a | ### Filter API |
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| 107 | n/a | |
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| 108 | n/a | def rot13(infile, outfile): |
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| 109 | n/a | outfile.write(codecs.encode(infile.read(), 'rot-13')) |
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| 110 | n/a | |
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| 111 | n/a | if __name__ == '__main__': |
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| 112 | n/a | import sys |
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| 113 | n/a | rot13(sys.stdin, sys.stdout) |
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