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/*
* Copyright (C) 2000-2006 SWsoft. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include "readelf.h"
#define EI_NIDENT 16
#define ELFMAG "\177ELF"
#define OLFMAG "\177OLF"
#define ELFCLASSNONE 0
#define ELFCLASS32 1
#define ELFCLASS64 2
struct elf_hdr_s {
uint8_t ident[EI_NIDENT];
uint16_t type;
uint16_t machine;
};
static inline int check_elf_magic(const uint8_t *buf)
{
if (memcmp(buf, ELFMAG, 4) &&
memcmp(buf, OLFMAG, 4))
{
return -1;
}
return 0;
}
int get_arch_from_elf(const char *file)
{
int fd, nbytes, class;
struct stat st;
struct elf_hdr_s elf_hdr;
if (stat(file, &st))
return -1;
if (!S_ISREG(st.st_mode))
return -1;
fd = open(file, O_RDONLY);
if (fd < 0)
return -1;
nbytes = read(fd, (void *) &elf_hdr, sizeof(elf_hdr));
close(fd);
if (nbytes < sizeof(elf_hdr))
return -1;
if (check_elf_magic(elf_hdr.ident))
return -1;
class = elf_hdr.ident[4];
switch (class) {
case ELFCLASS32:
return elf_32;
case ELFCLASS64:
return elf_64;
}
return elf_none;
}