Manipulte uploaded file before saving

[eluser]Bursh[/eluser]
[quote author="fatnic" date="1219700026"]Well after a quick re-read of the user guide, I can't see any way of changing the filename before you upload.

The only way I can think of to do it is not use the CodeIgniter upload library and use native PHP instead.[/quote]

I thought of that too. I guess I'll try it that way unless anybody else can come up with a way.