Just wondering: what do you need this for? I know numbers like this are used internaly in some peices of ISO-9660 (and iso9660-like, like playstation) filesystems, but why do you need to print out human-readable hex in this format? Or am I smoking crack?

(I'm interested in what you're doing even if I am smoking crack. I recently tried to divine the ps1 diskformat by example (for no good reason, since I was looking for PS2 data, and it uses a different (DVD-based) disk format), but ended up using C instead, since that way I could steal more easily from the Linux iso9660 code.