1164190Sjkoshy/*- 2164190Sjkoshy * Copyright (c) 2006 Joseph Koshy 3164190Sjkoshy * All rights reserved. 4164190Sjkoshy * 5164190Sjkoshy * Redistribution and use in source and binary forms, with or without 6164190Sjkoshy * modification, are permitted provided that the following conditions 7164190Sjkoshy * are met: 8164190Sjkoshy * 1. Redistributions of source code must retain the above copyright 9164190Sjkoshy * notice, this list of conditions and the following disclaimer. 10164190Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 11164190Sjkoshy * notice, this list of conditions and the following disclaimer in the 12164190Sjkoshy * documentation and/or other materials provided with the distribution. 13164190Sjkoshy * 14164190Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15164190Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16164190Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17164190Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18164190Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19164190Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20164190Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21164190Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22164190Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23164190Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24164190Sjkoshy * SUCH DAMAGE. 25164190Sjkoshy */ 26164190Sjkoshy 27164190Sjkoshy#include <sys/cdefs.h> 28164190Sjkoshy__FBSDID("$FreeBSD$"); 29164190Sjkoshy 30164190Sjkoshy#include <ar.h> 31164190Sjkoshy#include <libelf.h> 32164190Sjkoshy 33164190Sjkoshy#include "_libelf.h" 34164190Sjkoshy 35164190Sjkoshyoff_t 36164190Sjkoshyelf_rand(Elf *ar, off_t offset) 37164190Sjkoshy{ 38164190Sjkoshy struct ar_hdr *arh; 39164190Sjkoshy 40164190Sjkoshy if (ar == NULL || ar->e_kind != ELF_K_AR || 41164190Sjkoshy (offset & 1) || offset < SARMAG || 42164190Sjkoshy offset + sizeof(struct ar_hdr) >= ar->e_rawsize) { 43164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 44164190Sjkoshy return 0; 45164190Sjkoshy } 46164190Sjkoshy 47164190Sjkoshy arh = (struct ar_hdr *) (ar->e_rawfile + offset); 48164190Sjkoshy 49164190Sjkoshy /* a too simple sanity check */ 50164190Sjkoshy if (arh->ar_fmag[0] != '`' || arh->ar_fmag[1] != '\n') { 51164190Sjkoshy LIBELF_SET_ERROR(ARCHIVE, 0); 52164190Sjkoshy return 0; 53164190Sjkoshy } 54164190Sjkoshy 55164190Sjkoshy ar->e_u.e_ar.e_next = offset; 56164190Sjkoshy 57164190Sjkoshy return (offset); 58164190Sjkoshy} 59