#7475: add (un)transform method to bytes/bytearray and str, add back codecs that can be used with them from Python 2.
diff --git a/Lib/encodings/quopri_codec.py b/Lib/encodings/quopri_codec.py
new file mode 100644
index 0000000..9243fc4
--- /dev/null
+++ b/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,
+ )