email set_content does not always use the correct line length for the base64 CTE

[bitdancer]

BPO	28047
Nosy	@warsaw, @bitdancer

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = 'https://github.com/bitdancer'
closed_at = <Date 2016-09-09.19:01:29.457>
created_at = <Date 2016-09-09.18:25:05.350>
labels = ['type-bug', 'expert-email']
title = 'email set_content does not always use the correct  line length for the base64 CTE'
updated_at = <Date 2016-09-09.19:01:29.456>
user = 'https://github.com/bitdancer'

bugs.python.org fields:

activity = <Date 2016-09-09.19:01:29.456>
actor = 'r.david.murray'
assignee = 'r.david.murray'
closed = True
closed_date = <Date 2016-09-09.19:01:29.457>
closer = 'r.david.murray'
components = ['email']
creation = <Date 2016-09-09.18:25:05.350>
creator = 'r.david.murray'
dependencies = []
files = []
hgrepos = []
issue_num = 28047
keywords = []
message_count = 3.0
messages = ['275373', '275390', '275392']
nosy_count = 3.0
nosy_names = ['barry', 'r.david.murray', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28047'
versions = ['Python 3.5', 'Python 3.6']

[bitdancer]

The per-line character count is calculated incorrectly, such that some specified line lengths result in padding being added to each line, which is incorrect and breaks subsequent decoding.

[python-dev]

New changeset 99db6a25444b by R David Murray in branch '3.5':
bpo-28047: Fix calculation of base64 line length.
https://hg.python.org/cpython/rev/99db6a25444b

[bitdancer]

This is buggy in the old email code as well, but it doesn't affect anything there because only the default line length is ever used.