This statement is not portable in Python and it crashes on a Mac since it tries
to read 20 bytes.
struct.unpack("LHHBBBBBBBB", DepexFile.read(16))
The problem with unpack() is this form uses native size and alignment and
unsigned long is a different size on Windows and Mac OS (64-bit Python). To
make this code portable we need to prefix with an = or <
struct.unpack(“=LHHBBBBBBBB", DepexFile.read(16))
I’ve run into this issue before, and comes about from reading this table
(http://docs.python.org/2/library/struct.html):
Format C Type Python type Standard size Notes
x pad byte no value
c char string of length 1 1
b signed char integer 1 (3)
B unsigned char integer 1 (3)
? _Bool bool 1 (1)
h short integer 2 (3)
H unsigned short integer 2 (3)
i int integer 4 (3)
I unsigned int integer 4 (3)
l long integer 4 (3)
L unsigned long integer 4 (3)
q long long integer 8 (2), (3)
Q unsigned long long integer 8 (2), (3)
f float float 4 (4)
d double float 8 (4)
s char[] string
p char[] string
P void * integer (5), (3)
With out noticing that you need to use = to get the “Standard size":
By default, C types are represented in the machine’s native format and byte
order, and properly aligned by skipping pad bytes if necessary (according to
the rules used by the C compiler).
Alternatively, the first character of the format string can be used to indicate
the byte order, size and alignment of the packed data, according to the
following table:
Character Byte order Size Alignment
@ native native native
= native standard none
< little-endian standard none
> big-endian standard none
! network (= big-endian) standard none
If the first character is not one of these, '@' is assumed.
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