1/*-
2 * Copyright (c) 2015 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 <stdlib.h>
30#include <string.h>
31
32#include "_libpe.h"
33
34ELFTC_VCSID("$Id: pe_dos.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
35
36PE_DosHdr *
37pe_msdos_header(PE *pe)
38{
39
40	if (pe == NULL) {
41		errno = EINVAL;
42		return (NULL);
43	}
44
45	if (pe->pe_dh == NULL) {
46		errno = ENOENT;
47		return (NULL);
48	}
49
50	return (pe->pe_dh);
51}
52
53char *
54pe_msdos_stub(PE *pe, size_t *len)
55{
56
57	if (pe == NULL || len == NULL) {
58		errno = EINVAL;
59		return (NULL);
60	}
61
62	if (pe->pe_stub_ex > 0 &&
63	    (pe->pe_flags & LIBPE_F_LOAD_DOS_STUB) == 0) {
64		assert((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0);
65		(void) libpe_read_msdos_stub(pe);
66	}
67
68	*len = sizeof(PE_DosHdr) + pe->pe_stub_ex;
69
70	return (pe->pe_stub);
71}
72
73int
74ps_update_msdos_header(PE *pe, PE_DosHdr *dh)
75{
76
77	if (pe == NULL || dh == NULL) {
78		errno = EINVAL;
79		return (-1);
80	}
81
82	if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) {
83		errno = EACCES;
84		return (-1);
85	}
86
87	if (pe->pe_dh == NULL) {
88		if ((pe->pe_dh = malloc(sizeof(PE_DosHdr))) == NULL) {
89			errno = ENOMEM;
90			return (-1);
91		}
92	}
93
94	*pe->pe_dh = *dh;
95
96	pe->pe_flags |= LIBPE_F_DIRTY_DOS_HEADER;
97
98	return (0);
99}
100
101int
102ps_update_msdos_stub(PE *pe, char *dos_stub, size_t sz)
103{
104
105	if (pe == NULL || dos_stub == NULL || sz == 0) {
106		errno = EINVAL;
107		return (-1);
108	}
109
110	if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) {
111		errno = EACCES;
112		return (-1);
113	}
114
115	pe->pe_stub_app = dos_stub;
116	pe->pe_stub_app_sz = sz;
117
118	return (0);
119}
120