1 files changed, 13 insertions, 18 deletions
diff --git a/Lib/encodings/rot_13.py b/Lib/encodings/rot_13.py
index 52b6431cf30..3140c1432dc 100644..100755
--- a/Lib/encodings/rot_13.py
+++ b/Lib/encodings/rot_13.py
@@ -1,31 +1,30 @@
 #!/usr/bin/env python
 """ Python Character Mapping Codec for ROT13.
 
-    See http://ucsub.colorado.edu/~kominek/rot13/ for details.
+This codec de/encodes from str to str and is therefore usable with
+str.transform() and str.untransform().
 
-    Written by Marc-Andre Lemburg (mal@lemburg.com).
-
-"""#"
+Written by Marc-Andre Lemburg (mal@lemburg.com).
+"""
 
 import codecs
 
 ### Codec APIs
 
 class Codec(codecs.Codec):
+    def encode(self, input, errors='strict'):
+        return (input.translate(rot13_map), len(input))
 
-    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)
+    def decode(self, input, errors='strict'):
+        return (input.translate(rot13_map), len(input))
 
 class IncrementalEncoder(codecs.IncrementalEncoder):
     def encode(self, input, final=False):
-        return codecs.charmap_encode(input,self.errors,encoding_map)[0]
+        return input.translate(rot13_map)
 
 class IncrementalDecoder(codecs.IncrementalDecoder):
     def decode(self, input, final=False):
-        return codecs.charmap_decode(input,self.errors,decoding_map)[0]
+        return input.translate(rot13_map)
 
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
@@ -46,10 +45,10 @@ def getregentry():
         streamreader=StreamReader,
     )
 
-### Decoding Map
+### Map
 
-decoding_map = codecs.make_identity_dict(range(256))
-decoding_map.update({
+rot13_map = codecs.make_identity_dict(range(256))
+rot13_map.update({
    0x0041: 0x004e,
    0x0042: 0x004f,
    0x0043: 0x0050,
@@ -104,10 +103,6 @@ decoding_map.update({
    0x007a: 0x006d,
 })
 
-### Encoding Map
-
-encoding_map = codecs.make_encoding_map(decoding_map)
-
 ### Filter API
 
 def rot13(infile, outfile):