#7475: add (un)transform method to bytes/bytearray and str, add back codecs that can be used with them from Python 2.

Lib/encodings/quopri_codec.py

@@ -0,0 +1,56 @@
+"""Codec for quoted-printable encoding.
+
+This codec de/encodes from bytes to bytes and is therefore usable with
+bytes.transform() and bytes.untransform().
+"""
+
+import codecs
+import quopri
+from io import BytesIO
+
+def quopri_encode(input, errors='strict'):
+    assert errors == 'strict'
+    f = BytesIO(input)
+    g = BytesIO()
+    quopri.encode(f, g, 1)
+    return (g.getvalue(), len(input))
+
+def quopri_decode(input, errors='strict'):
+    assert errors == 'strict'
+    f = BytesIO(input)
+    g = BytesIO()
+    quopri.decode(f, g)
+    return (g.getvalue(), len(input))
+
+class Codec(codecs.Codec):
+    def encode(self, input, errors='strict'):
+        return quopri_encode(input, errors)
+    def decode(self, input, errors='strict'):
+        return quopri_decode(input, errors)
+
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    def encode(self, input, final=False):
+        return quopri_encode(input, self.errors)[0]
+
+class IncrementalDecoder(codecs.IncrementalDecoder):
+    def decode(self, input, final=False):
+        return quopri_decode(input, self.errors)[0]
+
+class StreamWriter(Codec, codecs.StreamWriter):
+    charbuffertype = bytes
+
+class StreamReader(Codec, codecs.StreamReader):
+    charbuffertype = bytes
+
+# encodings module API
+
+def getregentry():
+    return codecs.CodecInfo(
+        name='quopri',
+        encode=quopri_encode,
+        decode=quopri_decode,
+        incrementalencoder=IncrementalEncoder,
+        incrementaldecoder=IncrementalDecoder,
+        streamwriter=StreamWriter,
+        streamreader=StreamReader,
+    )