how to fuzz freetype library

1.get freetype source code
	wget http://download.savannah.gnu.org/releases/freetype/freetype-2.8.tar.gz
	tar -xf freetype-2.8.tar.gz
	cd freetype-2.8/
2.use afl-gcc to instrumentation
	CC=/home/wk/workspace/AFL/afl-gcc ./configure
	make
3.write a harness program

#include <ft2build.h>
#include FT_FREETYPE_H

int main(int argc, char *argv[]){
    FT_Library lib;
    FT_Face face;
    FT_Init_FreeType(&lib);
    FT_New_Face(lib, argv[1], 0, &face);
}

4.compile harness program with static link
	./afl-gcc fttest.c -I/home/wk/workspace/freetype-2.8/include -L/home/wk/workspace/freetype-2.8/objs/.libs -lfreetype -lz -static -o font_parser	
5.write a test case for harness program

wk@ubuntu:~/workspace/AFL$ cat tmp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wk@ubuntu:~/workspace/AFL$ cat tmp | base64 --decode > testcaseft/small.ttf

6.start to fuzz
	./afl-fuzz -i testcaseft/ -o findings_dir/ -- ./font_parser  @@