From: Scott Bronson <brons_rubyforum@...>
Date: 2010-09-11T05:14:17+09:00
Subject: Re: Rubyzip - `dup': can't dup NilClass (TypeError)

Thomas Sondergaard wrote:
> The encoding of the external file attributes appears to be illegal. To 
> verify this with another tool try running "zipinfo -v" on the zip-file 
> and notice that it prints a '?' as the file type in the external file 
> attributes.

Very strange.  My zipinfo -v doesn't show anything amiss.  I'm using:

   ZipInfo 3.00 of 20 April 2009, by Greg Roelofs and the Info-ZIP 
group.


> The problem should also be reported to the author of the tool generating 
> the zip archives.

Whatever tool is generating them, it's already in widespread use.  :( 
For instance, most zipfiles in the following packages are valid, but 
rubyzip can't handle them.

http://www.vim.org/scripts/script.php?script_id=3114
http://www.vim.org/scripts/script.php?script_id=3123
http://www.vim.org/scripts/script.php?script_id=3148
http://www.vim.org/scripts/script.php?script_id=3150
http://www.vim.org/scripts/script.php?script_id=3169

Thanks Thomas.  For now I've worked around it by shelling out to the 
unzip command.  If I have time I'll try your patch next week.

    - Scott
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