#include "woody.h"

int ident_error(void) {
	return wdy_error("file format not recognized (invalid ELF Ident)");
}

int is_valid_elf_magic_number(char *ident) {
	return !ft_strncmp(ident, ELFMAG, SELFMAG);
}

int is_valid_arch(char arch) {
	return arch == ELFCLASS64 || arch == ELFCLASS32;
}

int is_valid_data_format(unsigned char data_format) {
	return data_format == ELFDATA2MSB || data_format == ELFDATA2LSB;
}

int is_valid_version(unsigned char version) {
	return version == EV_CURRENT;
}

int check_ident(t_map file) {
	char *ident = (char *)fetch(file, 0, EI_NIDENT);
	if (!ident) {
		return ident_error();
	}

	if (!is_valid_elf_magic_number(ident) 
			|| !is_valid_arch(ident[EI_CLASS])
			|| !is_valid_data_format(ident[EI_DATA])
			|| !is_valid_version(ident[EI_VERSION])) {
		return ident_error();
	}

	return RET_OK;
}