1/*-
2 * Copyright (c) 2016 Kai Wang
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 <assert.h>
28#include <errno.h>
29#include <unistd.h>
30
31#include "_libpe.h"
32
33ELFTC_VCSID("$Id: pe_update.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
34
35off_t
36pe_update(PE *pe)
37{
38	off_t off;
39
40	if (pe == NULL) {
41		errno = EINVAL;
42		return (-1);
43	}
44
45	if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) {
46		errno = EACCES;
47		return (-1);
48	}
49
50	if (pe->pe_cmd == PE_C_RDWR || (pe->pe_cmd == PE_C_WRITE &&
51		(pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0)) {
52		if (lseek(pe->pe_fd, 0, SEEK_SET) < 0) {
53			errno = EIO;
54			return (-1);
55		}
56	}
57
58	off = 0;
59
60	if (pe->pe_obj == PE_O_PE32 || pe->pe_obj == PE_O_PE32P) {
61		if ((off = libpe_write_msdos_stub(pe, off)) < 0)
62			return (-1);
63
64		if ((off = libpe_write_pe_header(pe, off)) < 0)
65			return (-1);
66	}
67
68	if (libpe_resync_sections(pe, off) < 0)
69		return (-1);
70
71	if ((off = libpe_write_coff_header(pe, off)) < 0)
72		return (-1);
73
74	if ((off = libpe_write_section_headers(pe, off)) < 0)
75		return (-1);
76
77	if ((off = libpe_write_sections(pe, off)) < 0)
78		return (-1);
79
80	if (ftruncate(pe->pe_fd, off) < 0) {
81		errno = EIO;
82		return (-1);
83	}
84
85	return (off);
86}
87