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/zlib_codec.py

@@ -50,6 +50,16 @@ class Codec(codecs.Codec):
     def decode(self, input, errors='strict'):
         return zlib_decode(input, errors)
 
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    def encode(self, input, final=False):
+        assert self.errors == 'strict'
+        return zlib.compress(input)
+
+class IncrementalDecoder(codecs.IncrementalDecoder):
+    def decode(self, input, final=False):
+        assert self.errors == 'strict'
+        return zlib.decompress(input)
+
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
 
@@ -59,5 +69,12 @@ class StreamReader(Codec,codecs.StreamReader):
 ### encodings module API
 
 def getregentry():
-
-    return (zlib_encode,zlib_decode,StreamReader,StreamWriter)
+    return codecs.CodecInfo(
+        name='zlib',
+        encode=zlib_encode,
+        decode=zlib_decode,
+        incrementalencoder=IncrementalEncoder,
+        incrementaldecoder=IncrementalDecoder,
+        streamreader=StreamReader,
+        streamwriter=StreamWriter,
+    )