Patch #1436130: codecs.lookup() now returns a CodecInfo object (a subclass

of tuple) that provides incremental decoders and encoders (a way to use
stateful codecs without the stream API). Functions
codecs.getincrementaldecoder() and codecs.getincrementalencoder() have
been added.

Lib/encodings/charmap.py

@@ -21,30 +21,49 @@ class Codec(codecs.Codec):
     encode = codecs.charmap_encode
     decode = codecs.charmap_decode
 
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    def __init__(self, errors='strict', mapping=None):
+        codecs.IncrementalEncoder.__init__(self, errors)
+        self.mapping = mapping
+
+    def encode(self, input, final=False):
+        return codecs.charmap_encode(input, self.errors, self.mapping)[0]
+
+class IncrementalDecoder(codecs.IncrementalDecoder):
+    def __init__(self, errors='strict', mapping=None):
+        codecs.IncrementalDecoder.__init__(self, errors)
+        self.mapping = mapping
+
+    def decode(self, input, final=False):
+        return codecs.charmap_decode(input, self.errors, self.mapping)[0]
+
 class StreamWriter(Codec,codecs.StreamWriter):
 
     def __init__(self,stream,errors='strict',mapping=None):
-
         codecs.StreamWriter.__init__(self,stream,errors)
         self.mapping = mapping
 
     def encode(self,input,errors='strict'):
-
         return Codec.encode(input,errors,self.mapping)
 
 class StreamReader(Codec,codecs.StreamReader):
 
     def __init__(self,stream,errors='strict',mapping=None):
-
         codecs.StreamReader.__init__(self,stream,errors)
         self.mapping = mapping
 
     def decode(self,input,errors='strict'):
-
         return Codec.decode(input,errors,self.mapping)
 
 ### encodings module API
 
 def getregentry():
-
-    return (Codec.encode,Codec.decode,StreamReader,StreamWriter)
+    return codecs.CodecInfo(
+        name='charmap',
+        encode=Codec.encode,
+        decode=Codec.decode,
+        incrementalencoder=IncrementalEncoder,
+        incrementaldecoder=IncrementalDecoder,
+        streamwriter=StreamWriter,
+        streamreader=StreamReader,
+    )