Originally Posted by m0ngr31
How hard would it be to be able use this to update the meta information inside a mobi (like mobi2mobi) instead of unpacking it?
There's lots of code in Kindleunpack used for accessing
the EXTH data. But with the exception of a few routines in the portion that splits hybrid mobi/kf8's, it's not really geared toward modifying existing binary kindlebooks "on the fly," so to speak.