does java has any api for tar and gzip?

hi,

Does java has any api for compressing files or folders by tar and
gzip?where do i get the library(jar) for this? i seen standard java api
only provides java.util.zip classes only. But it does not have any
classes for tar and gzip. Pls give me any links where i get libraires
downloadable.

thanks,
nagesh

Nagesh

Nagesh wrote on 25.02.2006 11:31:
> hi,
>
> Does java has any api for compressing files or folders by tar and
> gzip?where do i get the library(jar) for this? i seen standard java api
> only provides java.util.zip classes only. But it does not have any
> classes for tar and gzip. Pls give me any links where i get libraires
> downloadable.
>

The standard libraries do supply gzip support:

http://java.sun.com/j2se/1.4.2/docs/...putStream.html
http://java.sun.com/j2se/1.4.2/docs/...putStream.html

at least that's what the docs say: "for reading compressed data in the GZIP format"

The Jakarta project seems to be working on tar support:

http://jakarta.apache.org/commons/sandbox/compress/

As this is obviously taken from the Ant sources, you might want to check them as
well.

A quick search in google revealed this as well:
http://www.trustice.com/java/tar/

Thomas

Thomas Kellerer

> Does java has any api for compressing files or folders by tar and
> gzip?where do i get the library(jar) for this? i seen standard java
> api only provides java.util.zip classes only. But it does not have any
> classes for tar and gzip. Pls give me any links where i get libraires
> downloadable.


googgled 'jtar' (and you should try do the same sometimes...)
http://www.angelfire.com/on/vkjava/


Java supports GZIP, but the GZIPInputStream cannot read multi-member gzip,
that is, a concatenation of gzips, as per the rfc 1952 (see 2.2)
http://bugs.sun.com/bugdatabase/view...bug_id=4691425
http://www.faqs.org/rfcs/rfc1952.html (see 2.2)


Beware that gzipping in java is 3x slower than the linux gzip. I resort to
runtime exec('gzip -c') while passing data to stdin and reading it back
from stdout of the spawn process...! (you can wrap it all in a simple
outputstream implementation for a nice reusability).

NOBODY

On 25 Feb 2006 02:31:06 -0800, "Nagesh" <>
wrote, quoted or indirectly quoted someone who said :

>But it does not have any
>classes for tar and gzip.

GZIP yes. tar no. See http://mindprod.com/jgloss/gzip.html
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

Roedy Green

The following link was pretty good. Thank you very much Thomas.
http://www.trustice.com/java/tar/



nagesh

Nagesh