#ifndef _LIBELF_ELF_H
#define _LIBELF_ELF_H 1

#include <stdint.h>

#define ET_NONE 0
#define ET_REL 1
#define ET_EXEC 2
#define ET_DYN 3
#define ET_CORE 4

#define EM_X86_64 62

#define EI_NIDENT 16
#define EI_MAG0 0
#define EI_MAG1 1
#define EI_MAG2 2
#define EI_MAG3 3
#define EI_CLASS 4
#define EI_DATA 5
#define EI_VERSION 6
#define EI_OSABI 7
#define EI_ABIVERSION 8
#define EI_PAD 9

#define ELFMAG0 0x7F
#define ELFMAG1 'E'
#define ELFMAG2 'L'
#define ELFMAG3 'F'

#define ELFCLASSNONE 0
#define ELFCLASS32 1
#define ELFCLASS64 2

#define ELFDATANONE 0
#define ELFDATA2LSB 1
#define ELFDATA2MSB 2

#define ELFOSABI_NONE 0
#define ELFOSABI_JOVE 15

#define EV_NONE 0
#define EV_CURRENT 1

typedef struct
{
    unsigned char e_ident[EI_NIDENT];
    uint16_t e_type;
    uint16_t e_machine;
    uint32_t e_version;
    uintptr_t e_entry;
    intptr_t e_phoff;
    intptr_t 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;
} Elf64_Ehdr;

#define SHT_NULL 0
#define SHT_PROGBITS 1
#define SHT_SYMTAB 2
#define SHT_STRTAB 3
#define SHT_NOBITS 8
#define SHT_DYNSYM 11
#define SHT_INIT_ARRAY 14
#define SHT_FINI_ARRAY 15
#define SHT_PREINIT_ARRAY 16
#define SHT_SYMTAB_SHNDX 18

#define SHF_WRITE           0b1
#define SHF_ALLOC           0b10
#define SHF_EXECINSTR       0b100
#define SHF_MERGE           0b1000
#define SHF_STRINGS         0b10000
#define SHF_INFO_LINK       0b100000
#define SHF_LINK_ORDER      0b1000000
#define SHF_OS_NONCONF      0b10000000
#define SHF_GROUP           0b100000000
#define SHF_TLS             0b1000000000
#define SHF_MASKOS          0x0FF00000
#define SHF_MASKPROC        0xF0000000

typedef struct
{
    uint32_t sh_name;
    uint32_t sh_type;
    uint64_t sh_flags;
    uintptr_t sh_addr;
    intptr_t sh_offset;
    uint64_t sh_size;
    uint32_t sh_link;
    uint32_t sh_info;
    uint64_t sh_addralign;
    uint64_t sh_entsize;
} Elf64_Shdr;

#define ELF64_ST_BIND(i) ((i) >> 4)
#define ELF64_ST_TYPE(i) ((i)&0xF)
#define ELF64_ST_INFO(b,t) (((b)<<4)+((t)&0xF))

#define ELF64_ST_VISIBILITY(o) ((o)&0x3)

#define STB_LOCAL 0
#define STB_GLOBAL 1
#define STB_WEAK 2

#define STT_NOTYPE 0
#define STT_OBJECT 1
#define STT_FUNC 2
#define STT_SECTION 3
#define STT_FILE 4
#define STT_COMMON 5
#define STT_TLS 6

#define STV_DEFAULT 0
#define STV_INTERNAL 1
#define STV_HIDDEN 2
#define STV_PROTECTED 3

typedef struct {
    uint32_t st_name;
    unsigned char st_info;
    unsigned char st_other;
    uint16_t st_shndx;
    uintptr_t st_value;
    uint64_t st_size;
} Elf64_Sym;

#endif