Extensions in FreeType library

[Yogesh Padmakar Ketkar]

Hello,
        I am using freetype 1.4 library,
trying to modify X-server code on linux to support
rendering of TrueTypeOpen Fonts.

        You have to initialize extension
by making calls like
        TT_Init_GSUB_Extension
there you pass GSUB_Destroy function which deallocates
memory associated with GSUB Tables.

        Now if i have loaded some OpenTypeFont, i 
want to unload it ( i.e. free the memory associated
with it ) how to deallocate memory associated
with GSUB/GPOS/GDEF tables explicitly?

because function GSUB_Destroy, GPOS_Destroy are static
function.

I will very much appreciate i someone can help me,
Sample examples which come with the freetype library,
this is happening , but i am not very sure how it
is happening?

-bye