#4661: add bytes parsing and generation to email (email version bump to 5.1.0)

The work on this is not 100% complete, but everything is present to
allow real-world testing of the code.  The only remaining major todo
item is to (hopefully!) enhance the handling of non-ASCII bytes in headers
converted to unicode by RFC2047 encoding them rather than replacing them with
'?'s.

1 files changed, 7 insertions, 0 deletions

diff --git a/Lib/email/feedparser.py b/Lib/email/feedparser.py
index 8db70b3c36..de8750dc16 100644
--- a/Lib/email/feedparser.py
+++ b/Lib/email/feedparser.py
@@ -482,3 +482,10 @@ class FeedParser:
         if lastheader:
             # XXX reconsider the joining of folded lines
             self._cur[lastheader] = EMPTYSTRING.join(lastvalue).rstrip('\r\n')
+
+
+class BytesFeedParser(FeedParser):
+    """Like FeedParser, but feed accepts bytes."""
+
+    def feed(self, data):
+        super().feed(data.decode('ascii', 'surrogateescape'))