Binary file difference

[Yancey B. Jones]

I am looking for an example or a resource on how to compare two versions of
the same file and create a third file that contains only the difference. I
then want to be able to take the first file and apply the third file to it
to re-create the second file. There are some backup programs that do
something similar and I am curious as to how this works.

Thanks for any suggestions,
Yancey

 

[Juan Gabriel Del Cid]

Look at http://sourceforge.net/projects/xdelta, that page is a link to a C
implementation of the XDelta algorithm
(http://heanet.dl.sourceforge.net/sourceforge/xdelta/xdfs.pdf, section 3).

Have fun,
-JG