#5610: use \Z not $ so we don't eat extra chars when body part ends with \r\n.

If a body part ended with \r\n, feedparser, using '$' to terminate its
search for the newline, would match on the \r\n, and think that it needed
to strip two characters in order to account for the line end before the
boundary.  That made it chop one too many characters off the end of
the body part.  Using \Z makes the match correct.

Patch and test by Tony Nelson.

Lib/email/feedparser.py

@@ -28,7 +28,7 @@ from email import message
 
 NLCRE = re.compile('\r\n|\r|\n')
 NLCRE_bol = re.compile('(\r\n|\r|\n)')
-NLCRE_eol = re.compile('(\r\n|\r|\n)$')
+NLCRE_eol = re.compile('(\r\n|\r|\n)\Z')
 NLCRE_crack = re.compile('(\r\n|\r|\n)')
 # RFC 2822 $3.6.8 Optional fields.  ftext is %d33-57 / %d59-126, Any character
 # except controls, SP, and ":".

Lib/email/test/test_email.py

@@ -2610,6 +2610,24 @@ Here's the message body
         eq(headers, ['A', 'B', 'CC'])
         eq(msg.get_payload(), 'body')
 
+    def test_CRLFLF_at_end_of_part(self):
+        # issue 5610: feedparser should not eat two chars from body part ending
+        # with "\r\n\n".
+        m = (
+            "From: foo@bar.com\n"
+            "To: baz\n"
+            "Mime-Version: 1.0\n"
+            "Content-Type: multipart/mixed; boundary=BOUNDARY\n"
+            "\n"
+            "--BOUNDARY\n"
+            "Content-Type: text/plain\n"
+            "\n"
+            "body ending with CRLF newline\r\n"
+            "\n"
+            "--BOUNDARY--\n"
+          )
+        msg = email.message_from_string(m)
+        self.assertTrue(msg.get_payload(0).get_payload().endswith('\r\n'))
 
 
 class TestBase64(unittest.TestCase):

Misc/NEWS

@@ -46,6 +46,9 @@ C-API
 Library
 -------
 
+- Issue #5610: feedparser no longer eats extra characters at the end of
+  a body part if the body part ends with a \r\n.
+
 - Issue #8833: tarfile created hard link entries with a size field != 0 by
   mistake.