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  3. March 2007

Re: Compress IFS Files

Hello Frank,


Hello, what do you think is the best way to compress IFS files?
Something like cprobj would be nice since I don't want to change
these files and they may be used again at some point.
The advantage that CPROBJ has over any IFS tool (that I can think of) is that CPROBJ will automatically decompress an object if the user tries to access it. By contrast, you'd have to manually decompress an IFS file prior to accessing it. 

There are a lot of ways to compress an IFS object.
a) The JAR command that you mentioned would work. However, JAR also creates an archive in addition to compressing it. And, by default, it adds a Java manifest to the object. 

b) The "compress" tool in QShell
c) The gzip tool is arguably the most commonly used compression tool on Unix systems for this type of thing. (It provides better compression than the "compress" tool.) You can download gzip for QShell at the following link: 
http://www-03.ibm.com/servers/enable/site/porting/iseries/overview/gnu_utilities.html
d) If you want even better compression, the bzip2 tool is also very commonly used on Unix systems. In fact, you could argue that bzip2 is replacing gzip as the most popular one. Though, in my experience, bzip2 is much slower than gzip and only saves a few bytes... It's available for PASE at the following link: 
http://aixpdslib.seas.ucla.edu/packages/bzip2.html
e) If you want something compatible with PKZIP (which is really only useful if you want to exchange data with Windows computers, IMHO) there's also InfoZip, which is IMHO, much nicer than JAR. You'll find InfoZip for PASE at the following links: 
http://aixpdslib.seas.ucla.edu/packages/zip.html
http://aixpdslib.seas.ucla.edu/packages/unzip.html
This is probably only the tip of the iceberg, but I've tried to provide the most commonly used solutions for compressing stream files. Hope they help...

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