"""
           #define EI_NIDENT 16

           typedef struct {
               unsigned char e_ident[EI_NIDENT];
               uint16_t      e_type;
               uint16_t      e_machine;
               uint32_t      e_version;
               ElfN_Addr     e_entry;
               ElfN_Off      e_phoff;
               ElfN_Off      e_shoff;
               uint32_t      e_flags;
               uint16_t      e_ehsize;
               uint16_t      e_phentsize;
               uint16_t      e_phnum;
               uint16_t      e_shentsize;
               uint16_t      e_shnum;
               uint16_t      e_shstrndx;
           } ElfN_Ehdr;
"""
@dataclass
class ElfEhdr:
    e_ident: bytes
    e_type: int
    e_machine: int
    e_version: int
    e_entry: int
    e_phoff: int
    e_shoff: int
    e_flags: int
    e_ehsize: int
    e_phentsize: int
    e_phnum: int
    e_shentsize: int
    e_shnum: int
    e_shstrndx: int

ELFMAG0  = 0x7f
ELFMAG1  = ord('E')
ELFMAG2  = ord('L')
ELFMAG3  = ord('F')

EI_NIDENT = 16

elf_ident_fields = [
    ("EI_MAG0",       0),
    ("EI_MAG1",       1),
    ("EI_MAG2",       2),
    ("EI_MAG3",       3),
    ("EI_CLASS",      4),
    ("EI_DATA",       5),
    ("EI_VERSION",    6),
    ("EI_OSABI",      7),
    ("EI_ABIVERSION", 8),
    ("EI_PAD",        9),
]

class ElfClass(IntEnum):
    NONE    = 0
    CLASS32 = 1
    CLASS64 = 2

class ElfData(IntEnum):
    NONE = 0
    LSB = 1
    MSB = 2

class OsABI(IntEnum):
    NONE = 0
    HPUX = 1
    NETBSD = 2
    GNU = 3
    SOLARIS = 6
    AIX = 7
    IRIX = 8
    FREEBSD = 9
    TRU64 = 10
    MODESTO = 11
    OPENBSD = 12
    ARM_AEABI = 64
    ARM = 97
    STANDALONE = 255