[physfs] ISO9660

[Ryan C. Gordon]

> i've currently achieved a working ISO9660 (CDROM Image) archiver with
> Joliet support in under 1k SLOC (smaller than the zip archiver ;))  I am

Hah, nice! (I'll add this to the list of things to look at behind the 
errorcode stuff. Sorry, it's been a busy week.)

> currently a little bit undecided on how to implement access with
> multiple files opened at the same opened on the same image. The easiest
> way is to open and close the image file an additional time everytime a
> file is opened or closed. The other way is to synchronize access to the

This is how the other archivers do it. They all share the basic info, 
but each opens a new OS-level file handle to the original archive for 
each PHYSFS_File.

--ryan.