AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  compression on different platforms          AppletTalk.com Forum Index -> JVM, native methods and hardware View previous topic :: View next topic   Author Message ctippur@gmail.com Guest Posted: Thu Dec 01, 2005 8:56 pm    Post subject: compression on different platforms All, PS. Please pardon me if I am posting this in the wrong group. I have used java.util.zip package to compress a folder recursively (which contains sub folders) using the package java.util.zip. It created a zip file after that. I am unable to unzip OR gunzip this file on HPUX. There are couple of problems on HPUX: 1. there is no unzip tool that comes with the OS distribution 2. gunzip tool that resides in /usr/contrib/bin folder is not appropriate. When I rename the file to .gz file and run gunzip on it, it comes with "file exists" error. I want to achieve the following things: a) I want to compress a folder recursively. b) I want to be able to access the files within the compressed file via java c) the compressed file must be "uncompressable" via tools available with OS. THe most convenient tool is compress as it is available everywhere with regular OS distribution. I have read on java docs that in order to achieve compress via gzip, we can do that only to a file. We have to essentially tar the folder and then gzip the tar ball. If we do it this way, can we access the files within the tar ball via java? On Solaris however, I was able to unzip it. Solaris8 $ unzip XXXX.zip Archive: XXXX.zip inflating: bin/hpux-risc inflating: bin/root.sh inflating: bin/createpackage inflating: bin/env inflating: bin/postinstallcheck inflating: bin/agentconnection.sh Solaris8 $ ls -ltr total 1168 -rw-r--r-- 1 itv1 itv1 585115 Dec 1 16:23 XXXX.zip drwxr-xr-x 2 itv1 itv1 618 Dec 1 16:23 bin I appreciate any inputs on this issue. Thanks - Shekar Back to top Mike Amling Guest Posted: Thu Dec 01, 2005 10:10 pm    Post subject: Re: compression on different platforms [email]ctippur (AT) gmail (DOT) com[/email] wrote: Quote: All, PS. Please pardon me if I am posting this in the wrong group. I have used java.util.zip package to compress a folder recursively (which contains sub folders) using the package java.util.zip. It created a zip file after that. I am unable to unzip OR gunzip this file on HPUX. There are couple of problems on HPUX: 1. there is no unzip tool that comes with the OS distribution 2. gunzip tool that resides in /usr/contrib/bin folder is not appropriate. When I rename the file to .gz file and run gunzip on it, it comes with "file exists" error. gunzip uses the gzip algorithm. Java's jar command, and the java.util.zip package, use the PKZIP algorithm, which is not compatible with gzip. Quote: I want to achieve the following things: a) I want to compress a folder recursively. b) I want to be able to access the files within the compressed file via java c) the compressed file must be "uncompressable" via tools available with OS. THe most convenient tool is compress as it is available everywhere with regular OS distribution. I have read on java docs that in order to achieve compress via gzip, we can do that only to a file. We have to essentially tar the folder and then gzip the tar ball. If we do it this way, can we access the files within the tar ball via java? On Solaris however, I was able to unzip it. Solaris's unzip command uses the PKZIP algorithm. Quote: Solaris8 $ unzip XXXX.zip Archive: XXXX.zip inflating: bin/hpux-risc inflating: bin/root.sh inflating: bin/createpackage inflating: bin/env inflating: bin/postinstallcheck inflating: bin/agentconnection.sh Solaris8 $ ls -ltr total 1168 -rw-r--r-- 1 itv1 itv1 585115 Dec 1 16:23 XXXX.zip drwxr-xr-x 2 itv1 itv1 618 Dec 1 16:23 bin I appreciate any inputs on this issue. Does your HPUX system have the Java SDK installed? If so, try jar -t to see a list of files in the .zip archive, and try jar -x to uncompress them. Note: If a Java JRE is installed but not the SDK, try java sun.tools.jar.Main -t or java sun.tools.jar.Main -x --Mike Amling Back to top ctippur@gmail.com Guest Posted: Fri Dec 02, 2005 4:56 am    Post subject: Re: compression on different platforms Thanks for the reply. This certainly works with jar utility. Is jar available on hpux and AIX with standard distribution? - Shekar Back to top ctippur@gmail.com Guest Posted: Fri Dec 02, 2005 11:02 am    Post subject: Re: compression on different platforms Is there a java utility available which uses the compress algorithm? compress is a tool available on all the platforms (as far as I can tell). - Shekar Back to top glen herrmannsfeldt Guest Posted: Sun Dec 04, 2005 1:23 am    Post subject: Re: compression on different platforms Mike Amling wrote: (snip) Quote: gunzip uses the gzip algorithm. Java's jar command, and the java.util.zip package, use the PKZIP algorithm, which is not compatible with gzip. Traditionally gunzip could unzip single file zip files, and, I believe, the first file of multiple file ones. I don't remember why it could do this, though. I have used jar for zip files when I didn't have unzip. -- glen Back to top Mike Amling Guest Posted: Sun Dec 04, 2005 8:59 pm    Post subject: Re: compression on different platforms glen herrmannsfeldt wrote: Quote: Mike Amling wrote: (snip) gunzip uses the gzip algorithm. Java's jar command, and the java.util.zip package, use the PKZIP algorithm, which is not compatible with gzip. Traditionally gunzip could unzip single file zip files, and, I believe, the first file of multiple file ones. I don't remember why it could do this, though. I have used jar for zip files when I didn't have unzip. Yes, that is true. Rather than "not compatible with", I should have said "not fully compatible with" or "not the same as". --Mike Amling Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> JVM, native methods and hardware All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.