1/*-
2 * Copyright (c) 2006 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <ar.h>
31#include <libelf.h>
32#include <string.h>
33
34#include "_libelf.h"
35
36Elf *
37elf_memory(char *image, size_t sz)
38{
39	Elf *e;
40
41	if (LIBELF_PRIVATE(version) == EV_NONE) {
42		LIBELF_SET_ERROR(SEQUENCE, 0);
43		return (NULL);
44	}
45
46	if (image == NULL || sz == 0) {
47		LIBELF_SET_ERROR(ARGUMENT, 0);
48		return (NULL);
49	}
50
51	if ((e = _libelf_allocate_elf()) == NULL)
52		return (NULL);
53
54	e->e_cmd = ELF_C_READ;
55	e->e_rawfile = image;
56	e->e_rawsize = sz;
57
58#undef	LIBELF_IS_ELF
59#define	LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && 		\
60	(P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 &&	\
61	(P)[EI_MAG3] == ELFMAG3)
62
63	if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
64		_libelf_init_elf(e, ELF_K_ELF);
65		e->e_class = image[EI_CLASS];
66		e->e_byteorder = image[EI_DATA];
67		e->e_version = image[EI_VERSION];
68
69		if (e->e_version > EV_CURRENT) {
70			e = _libelf_release_elf(e);
71			LIBELF_SET_ERROR(VERSION, 0);
72			return (NULL);
73		}
74
75		if ((e->e_byteorder != ELFDATA2LSB && e->e_byteorder !=
76 		    ELFDATA2MSB) || (e->e_class != ELFCLASS32 && e->e_class !=
77		    ELFCLASS64)) {
78			e = _libelf_release_elf(e);
79			LIBELF_SET_ERROR(HEADER, 0);
80			return (NULL);
81		}
82
83	} else if (sz >= SARMAG &&
84	    strncmp(image, ARMAG, (size_t) SARMAG) == 0) {
85		_libelf_init_elf(e, ELF_K_AR);
86		e = _libelf_ar_open(e);
87	} else
88		_libelf_init_elf(e, ELF_K_NONE);
89
90	return (e);
91}
92