elf_get_byte
static u_int64_t elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member);
class = elf_get_byte(e, e, E_CLASS);
data = elf_get_byte(e, e, E_DATA);
osabi = elf_get_byte(e, e, E_OSABI);
info = elf_get_byte(e, st, ST_INFO);