Hello, 

I have a problem with the librairy zipfile.py
Lib/zipfile.py?revision=73565&view=markup">http://svn.python.org/view/python/trunk/Lib/zipfile.py?revision=73565&view=markup


Zinfo structure limit the size of a file to an int max value with the
ZIP64_LIMIT value ( equal to "(1 << 31) - 1 " so to 2147483647 . 

The problem is happening when you write a big file in the line 1095 : 

self.fp.write(struct.pack("<lLL", zinfo.CRC, zinfo.compress_size,
                 zinfo.file_size))

zinfo.file_size is limited to a int  size and if you have a file bigger
than ZIP64_LIMIT you make a buffer overflow even if you set the flag
allowZip64 to true.

look like issue 1182788

I don't see how it can be a buffer overflow. Or is it an exception
raised by the struct.pack function?

yes it's zinfo.file_size which is bigger than the long specify in the 
struct.pack

There's must have a solution with the extra header because a lot of tools 
can zip big file and these zip file can be open by zipfile.py

it's easy to reproduice with a big file of 3 gig.

i think that the problem come from that the write methode do not take 
care of the flag allowZip64

still no one to help on this problem ? is someone has some idea ?

I did reproduce the problem, but I'm sorry I don't have the time to fix 
it. However, I will review any proposed patch.