Converting ASCII logs to Unified Format

["Jim O'Leary" <j_oleary_langara () yahoo ca>]

I have Snort set up so that it outputs logs and alerts to the binary
"unified" format. I also have barnyard set  up so that it reads those binary
files and sticks them into a MySQL database. 
 
The problem is, I've been given a group of Snort output files that are in
the ASCII format.  How do I convert these files to "unified" so I can get
barnyard to stick them into MySQL?
 
Thanks