Add CJK codecs support as discussed on python-dev. (SF #873597)

Several style fixes are suggested by Martin v. Loewis and
Marc-Andre Lemburg. Thanks!

Lib/encodings/johab.py

@@ -0,0 +1,34 @@
+#
+# johab.py: Python Unicode Codec for JOHAB
+#
+# Written by Hye-Shik Chang <perky@FreeBSD.org>
+# $CJKCodecs: johab.py,v 1.3 2004/01/17 11:26:10 perky Exp $
+#
+
+from _codecs_johab import codec
+import codecs
+
+class Codec(codecs.Codec):
+    encode = codec.encode
+    decode = codec.decode
+
+class StreamReader(Codec, codecs.StreamReader):
+    def __init__(self, stream, errors='strict'):
+        codecs.StreamReader.__init__(self, stream, errors)
+        __codec = codec.StreamReader(stream, errors)
+        self.read = __codec.read
+        self.readline = __codec.readline
+        self.readlines = __codec.readlines
+        self.reset = __codec.reset
+
+class StreamWriter(Codec, codecs.StreamWriter):
+    def __init__(self, stream, errors='strict'):
+        codecs.StreamWriter.__init__(self, stream, errors)
+        __codec = codec.StreamWriter(stream, errors)
+        self.write = __codec.write
+        self.writelines = __codec.writelines
+        self.reset = __codec.reset
+
+def getregentry():
+    return (Codec().encode,Codec().decode,StreamReader,StreamWriter)
+