1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
* (C) Copyright 2005
* 2N Telekomunikace, Ladislav Michl <michl@2n.cz>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "crcek.h"
extern unsigned long crc32(unsigned long, const unsigned char *, unsigned int);
uint32_t data[LOADER_SIZE/4 + 3];
int doit(char *path, unsigned version)
{
uint32_t *p;
ssize_t size;
int fd;
fd = open(path, O_RDONLY);
if (fd == -1) {
perror("Error opening file");
return EXIT_FAILURE;
}
p = data + 2;
size = read(fd, p, LOADER_SIZE + 4);
if (size == -1) {
perror("Error reading file");
return EXIT_FAILURE;
}
if (size > LOADER_SIZE) {
fprintf(stderr, "File too large\n");
return EXIT_FAILURE;
}
size = (((size - 1) >> 2) + 1) << 2;
data[0] = size + 4; /* add size of version field */
data[1] = version;
data[(size >> 2) + 2] = crc32(0, (unsigned char *)(data + 1), data[0]);
close(fd);
if (write(STDOUT_FILENO, data, size + 3*4) == -1) {
perror("Error writing file");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
int main(int argc, char **argv)
{
if (argc == 2) {
return doit(argv[1], 0);
} else if ((argc == 4) && (strcmp(argv[1], "-v") == 0)) {
char *endptr, *nptr = argv[2];
unsigned ver = strtoul(nptr, &endptr, 0);
if (*nptr != '\0' && *endptr == '\0')
return doit(argv[3], ver);
}
fprintf(stderr, "Usage: crcit [-v version] <image>\n");
return EXIT_FAILURE;
}
|
