[issue1622] zipfile hangs on certain zip files

[Alan McIntyre]

Alan McIntyre added the comment:

Here's an updated patch (zipfile-unsigned-fixes2.diff) that contains
Eric's fixes.  I also changed the structure for the Zip64 extension data
to be unsigned.  I think this should cover all the deficiencies caused
by the improper use of unsigned values.

Note: if this patch is committed, then issue 1746 should be closed since
it is fixed with this patch.

Added file: http://bugs.python.org/file9139/zipfile-unsigned-fixes2.diff

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