xxdi.pl is a perl script that implements vim's 'xxd -i' mode so that packages do not have to use all of vim just to get this functionality.
efitools is an example of a package that uses it in this manner, and in some build configurations, mediastreamer also does.
xxdi.pl was written by Greg Kroah-Hartman [email protected] and patches can be sent to him, or pull requests can be submitted from the main repo for this project at:
https://github.com/gregkh/xxdi
xxdi.pl is released under the GPL, version 2 only.