PalmOS 4.0 added a complete set of file access APIs and an architecture to support external storage cards. Until now, it has only included support for the FAT filesystem. HFS- is a misguided attempt to bring the Macintosh filesystem to the Palm in the form of a completely gratuitous 10GB expansion card. It has two parts - a macintosh "server" application, and a filesystem plugin for PalmOS. Together, they mount a subtree of the Mac's hard drive (rooted at the server app) as a standard PalmOS volume. All filesystem calls to the plugin are sent over the serial port and dispatched by the server app.
The code ain't pretty, and the Mac app probably won't even work without changes (unless you have a .Cin/.Cout serial port driver). I wrote it because 10 GB is just _way_ too much storage space to have available on a Palm device... and also so that I could distribute the source to the filesystem plugin to encourage all of you to write your own interesting filesystems for PalmOS.
