Merge part of the trunk changes into the p3yk branch. This merges from 43030
(branch-creation time) up to 43067. 43068 and 43069 contain a little
swapping action between re.py and sre.py, and this mightily confuses svn
merge, so later changes are going in separately.

This merge should break no additional tests.

The last-merged revision is going in a 'last_merge' property on '.' (the
branch directory.) Arbitrarily chosen, really; if there's a BCP for this, I
couldn't find it, but we can easily change it afterwards ;)
diff --git a/Lib/encodings/base64_codec.py b/Lib/encodings/base64_codec.py
index 085ab14..f84e780 100644
--- a/Lib/encodings/base64_codec.py
+++ b/Lib/encodings/base64_codec.py
@@ -49,6 +49,16 @@
     def decode(self, input,errors='strict'):
         return base64_decode(input,errors)
 
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    def encode(self, input, final=False):
+        assert self.errors == 'strict'
+        return base64.encodestring(input)
+
+class IncrementalDecoder(codecs.IncrementalDecoder):
+    def decode(self, input, final=False):
+        assert self.errors == 'strict'
+        return base64.decodestring(input)
+
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
 
@@ -58,5 +68,12 @@
 ### encodings module API
 
 def getregentry():
-
-    return (base64_encode,base64_decode,StreamReader,StreamWriter)
+    return codecs.CodecInfo(
+        name='base64',
+        encode=base64_encode,
+        decode=base64_decode,
+        incrementalencoder=IncrementalEncoder,
+        incrementaldecoder=IncrementalDecoder,
+        streamwriter=StreamWriter,
+        streamreader=StreamReader,
+    )