java.util.zip mvs unzip routine

gpklos · Post by **gpklos** » Mon Oct 26, 2009 2:18 pm

I have written a jcl routine in java for zos, which takes an MVS dataset (gdg,sequential), copies it to USS, then runs a routine from the classes in java.util.zip to zip the dataset into a zip file on USS, then use OCOPY to copy it back to the MVS side. That works fine, but now I'm trying do the same for an Unzip routine. Everything works basically the same (copy zip file from mvs to USS, then unzip it on the USS side). Now the problem comes in when I copy the unzipped files back to MVS. I don't know what the record length is or the record format, etc. Is there any way to determine that before unizipping it so that it can be allocated properly?
Thanks,
Gary
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Yamaha FZX750

Post by **dovetail** » Mon Oct 26, 2009 2:38 pm

You don't have to copy the dataset to USS first... check out the com.ibm.jzos.sample.ZipDatasets sample program.

The ZFile() class has getLrecl() and getRecfm() methods that you can use to get these attributes from an open dataset.

gpklos · Post by **gpklos** » Mon Oct 26, 2009 3:00 pm

You mean I could run a zip/unzip program all from the mvs side that utilizes java on the USS? Could it be done so that the unzip would then unzip a file and put in a dataset with the correct characteristics? Is this part of the JZOS. I currently don't use it.

thanks,
Gary
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Move

Post by **dovetail** » Mon Oct 26, 2009 3:13 pm

I'm not sure that I understand your question.
There really isn't an MVS side or a USS side per se - a Java program can run as an MVS job and use Unix apis and filesystems, and can also run under a Unix shell and access MVS apis and dateasts.

Check out the JZOS sample program com.ibm.jzos.ZipDatasets, available here:

http://www-03.ibm.com/servers/eserver/z ... ssamp.html

gpklos · Post by **gpklos** » Tue Oct 27, 2009 2:37 pm

I will take a look at it and try the JZOS.

I will also look at the Zip stuff for JZOS and see if I can somehow take the zipped file and know what characteristics to make it before I turn it back into a gdg.

Gary
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