Oekaki getpic.cgi?

I'm trying to get Oekaki working for my own personal use, and I've downloaded Shi-Painter.  My problem is that it seems to require a file "getpic.cgi".  I don't know anything about Perl, I'm coding my website in PHP, and I don't have any idea how to make it work.   I also can't find an example getpic.cgi anywhere.

How does the Oekaki program send the file up to the server?  Does it submit it as a file for uploading or some sort of voodoo with streams or what? Can I get a PHP alternative?  If there's no way to implement a PHP alternative, can someone point me to an example getpic.cgi so I can just copypasta it and get it over with?

SICP is Gay Speak for ``I am too stupid to read K&R.''