Toy elf header file

elf.h

#ifndef __ELF_H__
#define __ELF_H__

#include <stdint.h>

typedef uint16_t Elf32_Half;
typedef uint32_t Elf32_Off;
typedef uint32_t Elf32_Addr;
typedef uint32_t Elf32_Word;
typedef int32_t  Elf32_Sword;

typedef uint16_t Elf64_Half;
typedef uint64_t Elf64_Off;
typedef uint64_t Elf64_Addr;
typedef uint32_t Elf64_Word;
typedef int32_t  Elf64_Sword;
typedef uint64_t Elf64_Xword;
typedef uint64_t Elf64_Sxword;

#define EI_NIDENT 16

typedef struct {   
  unsigned char e_ident[EI_NIDENT];
  Elf32_Half e_type;
  Elf32_Half e_machine;
  Elf32_Word e_version;
  Elf32_Addr e_entry;
  Elf32_Off e_phoff;
  Elf32_Off e_shoff;
  Elf32_Word e_flags;
  Elf32_Half e_ehsize;
  Elf32_Half e_phentsize;
  Elf32_Half e_phnum;
  Elf32_Half e_shentsize;
  Elf32_Half e_shnum;
  Elf32_Half e_shtrndx;
} Elf32_Ehdr;

typedef struct {
  unsigned char e_ident[EI_NIDENT];
  Elf64_Half e_type;
  Elf64_Half e_machine;
  Elf64_Word e_version;
  Elf64_Addr e_entry;
  Elf64_Off e_phoff;
  Elf64_Off e_shoff;
  Elf64_Word e_flags;
  Elf64_Half e_ehsize;
  Elf64_Half e_phentsize;
  Elf64_Half e_phnum;
  Elf64_Half e_shentsize;
  Elf64_Half e_shnum;
  Elf64_Half e_shtrndx;
} Elf64_Ehdr;

enum {
    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
};
 
#define ELFMAG0        0x7F
#define ELFMAG1        'E'
#define ELFMAG2        'L'
#define ELFMAG3        'F'

enum {
    ELFCLASSNONE    = 0,
    ELFCLASS32      = 1,
    ELFCLASS64      = 2
};

#endif