modify the routines for checking the extension of filename
-rw-r--r-- 177 .gitignore
-rwxr-xr-x 902 CMakeLists.txt
-rw-r--r-- 10753 LICENSE
-rw-r--r-- 0 NOTICE
drwxr-xr-x - data
drwxr-xr-x - debian
drwxr-xr-x - include
drwxr-xr-x - packaging
drwxr-xr-x - src