This has been done, the last point is to be able to manage it if embeded in the ZIM file itself. This last point is tracked here: https://github.com/kiwix/kiwix/issues/281
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Here is a detailed view about the situation and a possible solution:
https://lists.wikimedia.org/pipermail/offline-l/2014-October/001279.html
Have submitted my work so far to #24
This has been done, the last point is to be able to manage it if embeded in the ZIM file itself. This last point is tracked here: https://github.com/kiwix/kiwix/issues/281