1*f8fb3368SJohn Marino /*-
2*f8fb3368SJohn Marino * Copyright (c) 2006,2008 Joseph Koshy
3*f8fb3368SJohn Marino * All rights reserved.
4*f8fb3368SJohn Marino *
5*f8fb3368SJohn Marino * Redistribution and use in source and binary forms, with or without
6*f8fb3368SJohn Marino * modification, are permitted provided that the following conditions
7*f8fb3368SJohn Marino * are met:
8*f8fb3368SJohn Marino * 1. Redistributions of source code must retain the above copyright
9*f8fb3368SJohn Marino * notice, this list of conditions and the following disclaimer.
10*f8fb3368SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
11*f8fb3368SJohn Marino * notice, this list of conditions and the following disclaimer in the
12*f8fb3368SJohn Marino * documentation and/or other materials provided with the distribution.
13*f8fb3368SJohn Marino *
14*f8fb3368SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15*f8fb3368SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16*f8fb3368SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17*f8fb3368SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18*f8fb3368SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19*f8fb3368SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20*f8fb3368SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21*f8fb3368SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22*f8fb3368SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23*f8fb3368SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24*f8fb3368SJohn Marino * SUCH DAMAGE.
25*f8fb3368SJohn Marino */
26*f8fb3368SJohn Marino
27*f8fb3368SJohn Marino #include <ar.h>
28*f8fb3368SJohn Marino #include <libelf.h>
29*f8fb3368SJohn Marino
30*f8fb3368SJohn Marino #include "_libelf.h"
31*f8fb3368SJohn Marino
32*f8fb3368SJohn Marino ELFTC_VCSID("$Id: elf_rand.c 3174 2015-03-27 17:13:41Z emaste $");
33*f8fb3368SJohn Marino
34*f8fb3368SJohn Marino off_t
elf_rand(Elf * ar,off_t offset)35*f8fb3368SJohn Marino elf_rand(Elf *ar, off_t offset)
36*f8fb3368SJohn Marino {
37*f8fb3368SJohn Marino struct ar_hdr *arh;
38*f8fb3368SJohn Marino
39*f8fb3368SJohn Marino if (ar == NULL || ar->e_kind != ELF_K_AR ||
40*f8fb3368SJohn Marino (offset & 1) || offset < SARMAG ||
41*f8fb3368SJohn Marino (size_t) offset + sizeof(struct ar_hdr) >= ar->e_rawsize) {
42*f8fb3368SJohn Marino LIBELF_SET_ERROR(ARGUMENT, 0);
43*f8fb3368SJohn Marino return 0;
44*f8fb3368SJohn Marino }
45*f8fb3368SJohn Marino
46*f8fb3368SJohn Marino arh = (struct ar_hdr *) (ar->e_rawfile + offset);
47*f8fb3368SJohn Marino
48*f8fb3368SJohn Marino /* a too simple sanity check */
49*f8fb3368SJohn Marino if (arh->ar_fmag[0] != '`' || arh->ar_fmag[1] != '\n') {
50*f8fb3368SJohn Marino LIBELF_SET_ERROR(ARCHIVE, 0);
51*f8fb3368SJohn Marino return 0;
52*f8fb3368SJohn Marino }
53*f8fb3368SJohn Marino
54*f8fb3368SJohn Marino ar->e_u.e_ar.e_next = offset;
55*f8fb3368SJohn Marino
56*f8fb3368SJohn Marino return (offset);
57*f8fb3368SJohn Marino }
58