I'm not entirely sure they're exactly what you're looking for but it's late and I don't want accuracy to stand in the way of me looking like I'm being helpful. ;o)
A couple of leads I've dug up:
http://web.archive.org/web/20031019211236/http://www.blitzbasic.com/bbs/posts.php?topic=17491
Peter Scheutz's adaptation of his zipwrapper into a Blitz3D userlib.
http://www.freewebs.com/elias_t/bz2wrapper.htm
Dog's Life Software's Blitz wrapper for the bzip2 compression method. By their own admission it doesn't compress directories yet (only single files), but... well it's something.
I hope those help. Either way, I'm going to bed. :oD
A couple of leads I've dug up:
http://web.archive.org/web/20031019211236/http://www.blitzbasic.com/bbs/posts.php?topic=17491
Peter Scheutz's adaptation of his zipwrapper into a Blitz3D userlib.
http://www.freewebs.com/elias_t/bz2wrapper.htm
Dog's Life Software's Blitz wrapper for the bzip2 compression method. By their own admission it doesn't compress directories yet (only single files), but... well it's something.
I hope those help. Either way, I'm going to bed. :oD