#ifndef _JOVE_ELF_H
#define _JOVE_ELF_H 1

#include <stdint.h>

/*A subset of the SystemV ELF ABI that only loads statically linked binaries.*/

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

typedef Elf32_Half Elf64_Half;
typedef Elf32_Word Elf64_Word;
typedef uint64_t Elf64_Xword;
typedef uintptr_t Elf64_Addr;
typedef uint64_t Elf64_Off;

enum {
    EI_MAG0 = 0,
    EI_MAG1,
    EI_MAG2,
    EI_MAG3,
    EI_CLASS,
    EI_DATA,
    EI_VERSION,
    EI_OSABI,
    EI_ABIVERSION,
    EI_PAD
};
#define EI_NIDENT 16

#define ELFMAG0 0x7f
#define ELFMAG1 'E'
#define ELFMAG2 'L'
#define ELFMAG3 'F'

#define ELFCLASSNONE 0
#define ELFCLASS64 2

#define ELFDATANONE 0
#define ELFDATA2LSB 1

#define ET_NONE 0
#define ET_EXEC 2

#define EM_X86_64 62

#define EV_NONE 0
#define EV_CURRENT 1

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_shstrndx;
} Elf64_Ehdr;

#define SHT_NULL 0
#define SHT_PROGBITS 1
#define SHT_NOBITS 8

#define SHF_WRITE 0x1
#define SHF_ALLOC 0x2

typedef struct {
    Elf64_Word sh_name;
    Elf64_Word sh_type;
    Elf64_Xword sh_flags;
    Elf64_Addr sh_addr;
    Elf64_Off sh_offset;
    Elf64_Xword sh_size;
    Elf64_Word sh_link;
    Elf64_Word sh_info;
    Elf64_Xword sh_addralign;
    Elf64_Xword sh_entsize;
} Elf64_Shdr;

#define PT_NULL 0
#define PT_LOAD 1

#define PF_X 1
#define PF_W 2
#define PF_R 4

typedef struct
{
    Elf64_Word p_type;
    Elf64_Word p_flags;
    Elf64_Off p_offset;
    Elf64_Addr p_vaddr;
    Elf64_Addr p_paddr;
    Elf64_Xword p_filesz;
    Elf64_Xword p_memsz;
    Elf64_Xword p_align;
} Elf64_Phdr;

int elf64_ehdr_valid(Elf64_Ehdr *ehdr);

#endif