pg_hba.conf is corrupt

[Ron <ronljohnsonjr@xxxxxxxxx>]

completely overwritten by binary data.  Been this way for 9 months, and we 
retain backups for 6 months.

Is there any way to query postgres to regenerate this data?  v8.4, if it 
matters.  (Yes, it's archaic; yes, we're migrating.)

Thanks.

--
Angular momentum makes the world go 'round.