Terry J. Reedy <tjre...@udel.edu> added the comment:
.apk is primarily used for Android Package files
https://en.wikipedia.org/wiki/APK_%28file_format%29
which are zipped JAR-based archives. By changing .apk to .zip, I can open the
file in Win7 explorer, which has zip built in.
A 'crash' is a segfault or equvalent. A traceback is a graceful shutdown and
not a crash. I reproduced the traceback on 3.3.0a1. It appears to say that
there are not enough bytes.
import struct
struct.unpack('<HH', b'abc')
#produces the same error
struct.error: unpack requires a bytes object of length 4
The 3.x message is clearer in that the second arg is a bytestring, not a char
string. It would not hurt it it said how many bytes it did get.
However, the behavior that leads to the message baffles me. The _decodeExtra
code looks like this, with some prints that I added.
def _decodeExtra(self):
# Try to decode the extra field.
extra = self.extra
unpack = struct.unpack
while extra:
print(extra)
tp, ln = unpack('<HH', extra[:4])
print(tp,ln)
if tp == 1:
pass # substitute for actual code not called
extra = extra[ln+4:]
print(extra)
The output is
b'\xfe\xca\x00\x00'
51966 0
b''
b'\x00'
Traceback (most recent call last): ...
So it looks like extra was properly formatted and properly snipped to 0 bytes,
but somehow gained a null byte before being tested again. 1 byte is not 4 bytes
and hence the error, but how?
----------
components: +Library (Lib) -None
nosy: +alanmcintyre, mark.dickinson, meador.inge, terry.reedy
type: crash -> behavior
versions: +Python 3.2, Python 3.3
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14315>
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