Strange problem with structs Linux vs. Mac

jasonwiener jasynwiener at gmail.com
Sun Mar 16 18:05:03 CET 2008


Hi-

I am having a VERY odd problem with unpacking right now.  I'm reading
data from a binary file and then using a very simple struct.unpack to
get a long.  Works fine on my MacBook, but when I push it to a Linux
box,it acts differently and ends up pewking.

here's the code snippet:
				fread.seek(0,0)
				tmp_rebuild = fread.read()
				fread.close()
				tmp_long = tmp_rebuild[0:4]
				print tmp_long.encode('hex')
				print repr(tmp_long)

				unpacked_long =  struct.unpack('I', tmp_rebuild[0:4])[0]
				print 'unpacked_long: %s' % unpacked_long

my MacBook produces:
1ec6f3b4
'\x1e\xc6\xf3\xb4'
unpacked_long: 516354996

but on the linux box the same code produces:
1ec6f3b4
'\x1e\xc6\xf3\xb4'
unpacked_long: 3035874846

the data looks to be the same, but the unpacking seems to treat it
differently.

Has anyone an idea of why this happens???

Thanks-
J.





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