Re: [gentoo-user] problem reading zip files

[Robert Bridge <robert@robbieab.com>]

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Doug ONeal wrote:
> I have had a problem dumped on me that I cannot resolve.  A user
> archived some very large
> datasets using Info-zip (app-arch/zip-2.32-r1) and the original data has
> been deleted.  The zip
> executable is a 64-bit binary and the user assumed that large archives
> were possible.  A typical
> archive is on the order of 70GB and the largest is over 200GB
> (compressed sizes).  /usr/bin/zip did
> not complain about creating the archive and /usr/bin/unzip -l lists the
> contents correctly so the user
> did not think there were any problems until it came time to extract a
> file.  Extracting any file that
> is past the 4GB mark in the archive results in a 'bad zipfile offset'
> error.  This is consistent with the
> FAQ on Info-zip's web site.
> 
> I am guessing that all of the data is actually present in the zip
> archives but I cannot get to it.  Trying
> version 3.0 of info-zip or any of the other linux & windows unzip
> programs has not been successful
> in extracting any of the later files in the archives.   I'm at a loss;
> does anybody have suggestions on
> how to retrieve this data?  Thanks.

The second thought that springs to would be be having a look at the
source code for unzip and seeing if you can tweak the "zipfile offset"
to allow for larger values than normal.

Assuming the data is there and correctly compressed, it should just be a
matter of getting the program to read it.

RobbieAB
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