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