New submission from Jussi Judin <[email protected]>:
sndhdr.what() function throws several types of exceptions on unknown files
instead of returning None (as documentation says).
Following code can replicate these crashes:
```
import sndhdr
import sys
sndhdr.what(sys.argv[1])
```
First crash is from wave or chunk module (input data is base64 encoded in the
echo command):
```
$ echo UklGRjAwMDBXQVZFZm10IDAwMDABADAwMDAwMDAwMDAwMDAw | python3.7 -mbase64 -d
> in.file
$ python3.7 sndhdr/test.py in.file
Traceback (most recent call last):
File "sndhdr/test.py", line 4, in <module>
sndhdr.what(sys.argv[1])
File "/tmp/python-3.7-bin/lib/python3.7/sndhdr.py", line 54, in what
res = whathdr(filename)
File "/tmp/python-3.7-bin/lib/python3.7/sndhdr.py", line 63, in whathdr
res = tf(h, f)
File "/tmp/python-3.7-bin/lib/python3.7/sndhdr.py", line 163, in test_wav
w = wave.open(f, 'r')
File "/tmp/python-3.7-bin/lib/python3.7/wave.py", line 510, in open
return Wave_read(f)
File "/tmp/python-3.7-bin/lib/python3.7/wave.py", line 164, in __init__
self.initfp(f)
File "/tmp/python-3.7-bin/lib/python3.7/wave.py", line 153, in initfp
chunk.skip()
File "/tmp/python-3.7-bin/lib/python3.7/chunk.py", line 160, in skip
self.file.seek(n, 1)
File "/tmp/python-3.7-bin/lib/python3.7/chunk.py", line 113, in seek
raise RuntimeError
RuntimeError
```
Second crash comes from sndhdr module itself (again base64 encoded data is
first decoded on command line):
```
$ echo AAA= | python3.7 -mbase64 -d > in.file
$ python3.7 sndhdr/test.py in.fileTraceback (most recent call last):
File "sndhdr/test.py", line 4, in <module>
sndhdr.what(sys.argv[1])
File "/tmp/python-3.7-bin/lib/python3.7/sndhdr.py", line 54, in what
res = whathdr(filename)
File "/tmp/python-3.7-bin/lib/python3.7/sndhdr.py", line 63, in whathdr
res = tf(h, f)
File "/tmp/python-3.7-bin/lib/python3.7/sndhdr.py", line 192, in test_sndr
rate = get_short_le(h[2:4])
File "/tmp/python-3.7-bin/lib/python3.7/sndhdr.py", line 213, in get_short_le
return (b[1] << 8) | b[0]
IndexError: index out of range
```
----------
components: Library (Lib)
messages: 321396
nosy: Barro
priority: normal
severity: normal
status: open
title: sndhdr.what() throws exceptions on unknown files
versions: Python 3.7
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue34088>
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