[issue34165] uu.decode() raises binascii.Error instead of uu.Error on invalid data

[Jussi Judin]

New submission from Jussi Judin <jjudin+python at iki.fi>:

uu.decode() function can leak the internal binascii.Error exception from binascii.a2b_uu() function call instead of the documented uu.Error exception.

Following code demonstrates the issue:

>>> import uu
>>> with open("in.uu", "wb") as fp:
...     fp.write(b'begin 0 \n0\xe8')
>>> uu.decode("in.uu", "out.uu")
Traceback (most recent call last):
  File "/tmp/python-3.7-bin/lib/python3.7/uu.py", line 148, in decode
    data = binascii.a2b_uu(s)
binascii.Error: Illegal char

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/tmp/python-3.7-bin/lib/python3.7/uu.py", line 152, in decode
    data = binascii.a2b_uu(s[:nbytes])
binascii.Error: Illegal char

It looks like the the workaround for broken encoders that catches the first binascii.Error exception just lets the second one to propagate if the recovery fails. I would except uu.Error to be raised instead, as that is mentioned in the documentation.

----------
components: Library (Lib)
messages: 321994
nosy: Barro
priority: normal
severity: normal
status: open
title: uu.decode() raises binascii.Error instead of uu.Error on invalid data
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34165>
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