Can someone give me some pointers on how i can change FASM to be useable as a JIT assembler?

My goal is to be incorporate FASM as a static lib into my application and to be able to pass to FASM a string or file of asm and have FASM assemble it and store the output as a buffer in memory that i would then be able to read the assembled code from the buffer and do with it what i please.