[issue9720] zipfile writes incorrect local file header for large files in zip64

[goodwin.gt]

> Alan McIntyre <alan.mcintyre at gmail.com> added the comment:
> 
> Here's an updated patch for the py3k trunk with tests.  This pretty much
> doubles the runtime of test_zipfile64.py.  The patch also removes some
> unnecessary code from the existing test_zipfile64 tests.
> 

Hello Alan

I've faced this problem too.
I start packing a 4.73GB file, and receive the "struct error" as follows:

1) Python 2.7.2 production:

...
  File "C:\Python27\lib\zipfile.py", line 1100, in write
    zinfo.file_size))
struct.error: integer out of range for 'L' format code

2) Python 3.2 production:

...
  File "C:\Python32\lib\zipfile.py", line 1142, in write
    zinfo.file_size))
struct.error: argument out of range



Environment: Windows 7 Ultimate 32bit

Everytime packing process fails at 4,981,808,577 byte

I need a patch for Python 2.7.2 .
Could you adapt your patch appropriately?

Thanks.

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