bpo-33524: Fix the folding of email header when max_line_length is 0 or None (GH-13391)
and there are non-ascii characters in the header.
(cherry picked from commit feac6cd7753425fba006e97e2d9b74a0c0c75894)
Co-authored-by: Abhilash Raj <maxking@users.noreply.github.com>
diff --git a/Lib/email/policy.py b/Lib/email/policy.py
index 5131311ac..611deb5 100644
--- a/Lib/email/policy.py
+++ b/Lib/email/policy.py
@@ -3,6 +3,7 @@
"""
import re
+import sys
from email._policybase import Policy, Compat32, compat32, _extend_docstrings
from email.utils import _has_surrogates
from email.headerregistry import HeaderRegistry as HeaderRegistry
@@ -203,7 +204,7 @@
def _fold(self, name, value, refold_binary=False):
if hasattr(value, 'name'):
return value.fold(policy=self)
- maxlen = self.max_line_length if self.max_line_length else float('inf')
+ maxlen = self.max_line_length if self.max_line_length else sys.maxsize
lines = value.splitlines()
refold = (self.refold_source == 'all' or
self.refold_source == 'long' and