very big files on cd9660 file system

[Dag-Erling Smørgrav]

The attached patch should make the isonum functions in iso.h much
clearer.  It also gets rid of the optimizated versions; I trust the
compiler to take care of that.

The inode number situation can be improved by dividing the byte offset
of the directory entry by a suitable number guaranteed not to be
larger than the size in bytes of any directory entry, e.g. 32 (IIUC, a
directory entry contains at least 33 bytes of metadata and padding in
addition to the file name)

DES
-- 
Dag-Erling Smørgrav - des at des.no

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