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
34 ELFTC_VCSID("$Id: pe_dos.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
35
36 PE_DosHdr *
pe_msdos_header(PE * pe)37 pe_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
53 char *
pe_msdos_stub(PE * pe,size_t * len)54 pe_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
73 int
ps_update_msdos_header(PE * pe,PE_DosHdr * dh)74 ps_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
101 int
ps_update_msdos_stub(PE * pe,char * dos_stub,size_t sz)102 ps_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