struct elf32 {
   u32 e_entry hex;
   u32 e_phoff;
   u32 e_shoff;
};

struct elf64 {
   u64 e_entry hex;
   u64 e_phoff;
   u64 e_shoff;
};

struct elf {
   u8 ei_magic[4] | matches('\x7fELF') str;
   u8 ei_class hex; // word size
   u8 ei_data hex; // endianess
   u8 ei_version;
   u8 ei_osabi;
   u8 ei_abi_version;
   u8 padding[7] nul;
   u16 e_type hex;
   u16 e_machine hex;
   u32 e_version;
   select (ei_class) {
      1) struct elf32 elf32;
      2) struct elf64 elf64;
   } arch;
   u32 e_flags hex;
   u16 e_ehsz;
   u16 e_phentsize;
   u16 e_phnum;
   u16 e_shentsize;
   u16 e_shnum;
   u16 e_shstrndx;
};