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-rw-r--r--Lib/email/header.py3
-rw-r--r--Lib/email/test/test_email.py11
2 files changed, 13 insertions, 1 deletions
diff --git a/Lib/email/header.py b/Lib/email/header.py
index 3215a80..afcea40 100644
--- a/Lib/email/header.py
+++ b/Lib/email/header.py
@@ -94,6 +94,9 @@ def decode_header(header):
word = email.quoprimime.header_decode(encoded_string)
decoded_words.append((word, charset))
elif encoding == 'b':
+ paderr = len(encoded_string) % 4 # Postel's law: add missing padding
+ if paderr:
+ encoded_string += '==='[:4 - paderr]
try:
word = email.base64mime.decode(encoded_string)
except binascii.Error:
diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index 7d91d25..0559142 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -1645,6 +1645,15 @@ Re: =?mac-iceland?q?r=8Aksm=9Arg=8Cs?= baz foo bar =?mac-iceland?q?r=8Aksm?=
(b'rg', None), (b'\xe5', 'iso-8859-1'),
(b'sbord', None)])
+ def test_rfc2047_B_bad_padding(self):
+ s = '=?iso-8859-1?B?%s?='
+ data = [ # only test complete bytes
+ ('dm==', b'v'), ('dm=', b'v'), ('dm', b'v'),
+ ('dmk=', b'vi'), ('dmk', b'vi')
+ ]
+ for q, a in data:
+ dh = decode_header(s % q)
+ self.assertEqual(dh, [(a, 'iso-8859-1')])
# Test the MIMEMessage class
@@ -3172,7 +3181,7 @@ A very long line that must get split to something other than at the
def test_broken_base64_header(self):
raises = self.assertRaises
- s = 'Subject: =?EUC-KR?B?CSixpLDtKSC/7Liuvsax4iC6uLmwMcijIKHaILzSwd/H0SC8+LCjwLsgv7W/+Mj3IQ?='
+ s = 'Subject: =?EUC-KR?B?CSixpLDtKSC/7Liuvsax4iC6uLmwMcijIKHaILzSwd/H0SC8+LCjwLsgv7W/+Mj3I ?='
raises(errors.HeaderParseError, decode_header, s)