l i n u x - u s e r s - g r o u p - o f - d a v i s
Next Meeting:
July 7: Social gathering
Next Installfest:
Latest News:
Jun. 14: June LUGOD meeting cancelled
Page last updated:
2002 Mar 07 23:26

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
Re: [vox-tech] reading a .gz .Z after offset
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [vox-tech] reading a .gz .Z after offset

On Thu, 7 Mar 2002, Jeff Newmiller wrote:

> I don't think you can do seeks in a compressed file... you have to read it
> sequentially.
> If you have a plan for dividing up the uncompressed data, perhaps you
> should do that first and store the split data as separate files
> (recompressed or not) for purposes of computation.

The zlib library offers a seek function in its utility function API,
"gzseek(gzFile, z_off_t, int)".  Since the zlib compression uses the
deflation algorithm that compresses data in blocks of a known size, it can
find the block you're seeking, inflate just that block, and return the
data (I'm not sure if that's how gzseek works, but I'm just sain' it can
be done.)  I'm sure in all PERL's ingenuity, it can be done in PERL, too.

Go Eric!  Keep looking! :)


Mark K. Kim
PGP key available upon request.

vox-tech mailing list

LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
Sunset Systems
Who graciously hosts our website & mailing lists!