An Emacs Lisp implementation of diff, patch, cmp?

[Eivind L. Rygge]

Hi.

I am looking for a (e)lisp version of diff, patch, cmp for use in ediff
on systems where they are not installed as command tools.

The only thread I could find was this discussion (from 2002): 
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=y1b_7.10226%24MU4.99585%40rwcrnsc53&rnum=7&prev=/groups%3Fq%3Demacs%2Bdiff%2Bediff%2Blisp%26hl%3Den%26lr%3D%26ie%3DUTF-8%26selm%3Dy1b_7.10226%2524MU4.99585%2540rwcrnsc53%26rnum%3D7

Does anyone know more about this?  I guess they will be slow on large
files, but I think they would be (very) nice to have anyway. 


Thanks, 

Eivind L. Rygge