[CentOS] How can I access a ZIP file that's over 2Gb?

Stephen John Smoogen smooge at gmail.com
Sun Mar 14 00:49:06 UTC 2010


On Sat, Mar 13, 2010 at 4:53 PM, Stephen Harris <lists at spuddy.org> wrote:
> I have a zip file.  It is over 2Gb in size:
>
> -rw-r--r-- 1 sweh sweh 2383956582 Mar 13 13:44 test.zip
>
> The standard "unzip" program barfs:
>  % unzip -l test.zip
>  Archive:  test.zip
>    End-of-central-directory signature not found.  Either this file is not
>    a zipfile, or it constitutes one disk of a multi-part archive.  In the
>    latter case the central directory and zipfile comment will be found on
>    the last disk(s) of this archive.
>  unzip:  cannot find zipfile directory in one of test.zip or
>          test.zip.zip, and cannot find test.zip.ZIP, period.
>
> This is because the info-zip utilities can't handle ZIP files over 2Gb in
> size.
>
> Windows can access it just fine.
>
> Anyone have any recommendations on a unix tool that'll let me access these
> large files?
>

My guess is that the code has not been updated to deal with large
fseeks. Looking at the FAQ at http://www.info-zip.org they know that a
file longer than 2 GB will have problems because of this.

http://www.info-zip.org/FAQ.html#limits

=>
While the only theoretical limit on the size of an archive is given by
(65,536 files x 4 GB each), realistically UnZip's random-access
operation and (partial) dependence on the stored compressed-size
values limits the total size to something in the neighborhood of 2 to
4 GB. This restriction may be relaxed in a future release. (On 64-bit
IRIX with the native compiler, the options "-mips4 -64" or "-mips4 -64
-ipa" [for both compiling and linking] may help. "-ipa" is reported to
generate incorrect code sometimes, however.)
<=

My guess is that would affect things the most. My guess is that the
windows tools have code to deal with this and the unzip tool needs a
rewrite to match it.
-- 
Stephen J Smoogen.

Ah, but a man's reach should exceed his grasp. Or what's a heaven for?
-- Robert Browning


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