Good. The package already uses JNI. If you open some of the CPP and Java files, you already see uses of JNI. For further information about JNI, see

http://java.sun.com/developer/online...CBook/jni.html

Probably the major problem is that C/C++ programs are usually platform dependent, so a C/C++ program may not compile on a different OS or compiler. From the sources, it appears that it was originally intended for Visual Studio + Windows, so expect some porting work before you can actually use something JNI on Unix.

EDIT: I just saw a hwinterface.sys inside. Probably it is a binary produced by an assembler which contains the real meat of the I/O, but no source is available. For this particular package, I don't think you can use it on Unix successfully.