blob: e0cea9b3fb6e12f2e6ac0fe3cb123f4b153862eb [file] [log] [blame]
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +02001/*
2 * (C) Copyright 2005
3 * 2N Telekomunikace, Ladislav Michl <michl@2n.cz>
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <stdio.h>
25#include <stdlib.h>
26#include <stdint.h>
27#include <fcntl.h>
28#include <string.h>
29#include <unistd.h>
30#include <sys/types.h>
31#include <sys/stat.h>
32#include "crcek.h"
33
Ladislav Michl3f464b02009-03-16 23:31:20 +010034extern uint32_t crc32(uint32_t, const unsigned char *, uint);
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +020035
Ladislav Michl3f464b02009-03-16 23:31:20 +010036static uint32_t data[LOADER_SIZE/4 + 3];
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +020037
Ladislav Michl3f464b02009-03-16 23:31:20 +010038static int do_crc(char *path, unsigned version)
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +020039{
40 uint32_t *p;
41 ssize_t size;
42 int fd;
43
44 fd = open(path, O_RDONLY);
45 if (fd == -1) {
46 perror("Error opening file");
47 return EXIT_FAILURE;
48 }
49 p = data + 2;
50 size = read(fd, p, LOADER_SIZE + 4);
51 if (size == -1) {
52 perror("Error reading file");
53 return EXIT_FAILURE;
54 }
55 if (size > LOADER_SIZE) {
56 fprintf(stderr, "File too large\n");
57 return EXIT_FAILURE;
58 }
Ladislav Michl3f464b02009-03-16 23:31:20 +010059 size = (size + 3) & ~3; /* round up to 4 bytes */
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +020060 data[0] = size + 4; /* add size of version field */
61 data[1] = version;
Ladislav Michl3f464b02009-03-16 23:31:20 +010062 data[2 + (size >> 2)] = crc32(0, (unsigned char *)(data + 1), data[0]);
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +020063 close(fd);
64
65 if (write(STDOUT_FILENO, data, size + 3*4) == -1) {
66 perror("Error writing file");
67 return EXIT_FAILURE;
68 }
69
70 return EXIT_SUCCESS;
71}
72
73int main(int argc, char **argv)
74{
75 if (argc == 2) {
Ladislav Michl3f464b02009-03-16 23:31:20 +010076 return do_crc(argv[1], 0);
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +020077 } else if ((argc == 4) && (strcmp(argv[1], "-v") == 0)) {
78 char *endptr, *nptr = argv[2];
79 unsigned ver = strtoul(nptr, &endptr, 0);
Wolfgang Denk87a5c732006-07-21 11:38:33 +020080 if (*nptr != '\0' && *endptr == '\0')
Ladislav Michl3f464b02009-03-16 23:31:20 +010081 return do_crc(argv[3], ver);
Wolfgang Denkac7eb8a2005-09-14 23:53:32 +020082 }
83 fprintf(stderr, "Usage: crcit [-v version] <image>\n");
84
85 return EXIT_FAILURE;
86}