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 
33 ELFTC_VCSID("$Id: pe_update.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
34 
35 off_t
36 pe_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