Recovering lost large objects?

Hi,

After having moved the database directories to a new server, something went
wrong with the large objects. I now have a large number of files named
'xinv<number>' and 'xinx<number>', but trying to lo_open <number> (where
that is a number that was a working large object before) now yields errors
like "lo_open: can't open inv object 9436449".

What I would like is some way to just access all the raw LO-files and
extract the original object from inside them, after which I can insert them
into the database again.

I have not found any information on the file format of the LO-files, nor any
programs to aid in recovering large objects when the index (or whatever it
is that decides that the object no longer exists) is broken.

Anyone who can help?

--
Jakob Borg            mailto:jakob@borg.pp.se       (personal)
UNIX/network admin    mailto:jakob@debian.org    (development)
systems programmer    mailto:jakob@morotsmedia.se       (work)
                      http://jakob.borg.pp.se/