Post top tier code

Can be yours or not, I just want to see something good.

>>5
Packing/unpacking one bit at a time like that is going to be horribly slow. Probably better to use an array of unsigned int and use shifts and masks to pack sizeof(unsigned) * CHAR_BIT bits at a time wherever possible. The cfbcopyarea routines in the Linux kernel do this but the implementation there is rather wizardly.