114 lines
2.4 KiB
Python
114 lines
2.4 KiB
Python
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#!/usr/bin/env python
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""" Python Character Mapping Codec for ROT13.
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This codec de/encodes from str to str.
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Written by Marc-Andre Lemburg (mal@lemburg.com).
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"""
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import codecs
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### Codec APIs
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class Codec(codecs.Codec):
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def encode(self, input, errors='strict'):
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return (str.translate(input, rot13_map), len(input))
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def decode(self, input, errors='strict'):
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return (str.translate(input, rot13_map), len(input))
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class IncrementalEncoder(codecs.IncrementalEncoder):
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def encode(self, input, final=False):
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return str.translate(input, rot13_map)
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class IncrementalDecoder(codecs.IncrementalDecoder):
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def decode(self, input, final=False):
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return str.translate(input, rot13_map)
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class StreamWriter(Codec,codecs.StreamWriter):
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pass
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class StreamReader(Codec,codecs.StreamReader):
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pass
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### encodings module API
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def getregentry():
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return codecs.CodecInfo(
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name='rot-13',
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encode=Codec().encode,
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decode=Codec().decode,
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incrementalencoder=IncrementalEncoder,
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incrementaldecoder=IncrementalDecoder,
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streamwriter=StreamWriter,
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streamreader=StreamReader,
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_is_text_encoding=False,
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)
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### Map
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rot13_map = codecs.make_identity_dict(range(256))
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rot13_map.update({
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0x0041: 0x004e,
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0x0042: 0x004f,
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0x0043: 0x0050,
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0x0044: 0x0051,
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0x0045: 0x0052,
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0x0046: 0x0053,
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0x0047: 0x0054,
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0x0048: 0x0055,
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0x0049: 0x0056,
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0x004a: 0x0057,
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0x004b: 0x0058,
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0x004c: 0x0059,
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0x004d: 0x005a,
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0x004e: 0x0041,
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0x004f: 0x0042,
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0x0050: 0x0043,
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0x0051: 0x0044,
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0x0052: 0x0045,
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0x0053: 0x0046,
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0x0054: 0x0047,
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0x0055: 0x0048,
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0x0056: 0x0049,
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0x0057: 0x004a,
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0x0058: 0x004b,
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0x0059: 0x004c,
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0x005a: 0x004d,
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0x0061: 0x006e,
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0x0062: 0x006f,
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0x0063: 0x0070,
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0x0064: 0x0071,
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0x0065: 0x0072,
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0x0066: 0x0073,
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0x0067: 0x0074,
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0x0068: 0x0075,
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0x0069: 0x0076,
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0x006a: 0x0077,
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0x006b: 0x0078,
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0x006c: 0x0079,
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0x006d: 0x007a,
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0x006e: 0x0061,
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0x006f: 0x0062,
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0x0070: 0x0063,
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0x0071: 0x0064,
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0x0072: 0x0065,
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0x0073: 0x0066,
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0x0074: 0x0067,
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0x0075: 0x0068,
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0x0076: 0x0069,
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0x0077: 0x006a,
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0x0078: 0x006b,
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0x0079: 0x006c,
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0x007a: 0x006d,
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})
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### Filter API
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def rot13(infile, outfile):
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outfile.write(codecs.encode(infile.read(), 'rot-13'))
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if __name__ == '__main__':
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import sys
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rot13(sys.stdin, sys.stdout)
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