i had a look at zip format and found it has a loooong list of fields to be filled.
sad i can't use a library because i didn't found one able to archive on-the-fly like HFS needs to.
There were some components from Turbopower. The library was named Abbrevia...looking it up... here it is:
http://tpabbrevia.sf.net/As they closed, they released everything as OpenSource under MPL 1.1
In this package, there are several compression components, maybe you would use one of these..
Other stuff form them(maybe you need it sometimes):
www.turbopower.com
