Thanks for your efforts, they are greatly appreciated.
But you should respect the original license:
GNU General Public License, version 2
CoolReader 3 - free e-book reader
(c) Vadim Lopatin, 1998-2009
LICENSE: All source codes (except thirdparty directory)
are provided under the terms of GNU GPL license, version 2
Source codes are available at sourceforge:
git clone git://crengine.git.sourceforge.net/gitr ... e/crengine
Please be polite with the work of others and contribute back. Anyway, the license says clearly you must contribute back your changes.