bcm63xx: Add firmware helpers for T-Home Speedport W 303V
[openwrt/svn-archive/archive.git] / tools / firmware-utils / src / xorimage.c
1 /*
2 * xorimage.c - partially based on OpenWrt's addpattern.c
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <stdint.h>
24 #include <time.h>
25 #include <unistd.h>
26 #include <sys/stat.h>
27
28 static char default_pattern[] = "12345678";
29
30
31 int xor_data(uint8_t *data, size_t len, const uint8_t *pattern, int p_len, int p_off)
32 {
33 int offset = p_off;
34 while (len--) {
35 *data ^= pattern[offset];
36 data++;
37 offset = (offset + 1) % p_len;
38 }
39 return offset;
40 }
41
42
43 void usage(void) __attribute__ (( __noreturn__ ));
44
45 void usage(void)
46 {
47 fprintf(stderr, "Usage: xorimage [-i infile] [-o outfile] [-p <pattern>]\n");
48 exit(EXIT_FAILURE);
49 }
50
51
52 int main(int argc, char **argv)
53 {
54 char buf[1024]; /* keep this at 1k or adjust garbage calc below */
55 FILE *in = stdin;
56 FILE *out = stdout;
57 char *ifn = NULL;
58 char *ofn = NULL;
59 const char *pattern = default_pattern;
60 int c;
61 int v0, v1, v2;
62 size_t n;
63 int p_len, p_off = 0;
64
65 while ((c = getopt(argc, argv, "i:o:p:h")) != -1) {
66 switch (c) {
67 case 'i':
68 ifn = optarg;
69 break;
70 case 'o':
71 ofn = optarg;
72 break;
73 case 'p':
74 pattern = optarg;
75 break;
76 case 'h':
77 default:
78 usage();
79 }
80 }
81
82 if (optind != argc || optind == 1) {
83 fprintf(stderr, "illegal arg \"%s\"\n", argv[optind]);
84 usage();
85 }
86
87 if (ifn && !(in = fopen(ifn, "r"))) {
88 fprintf(stderr, "can not open \"%s\" for reading\n", ifn);
89 usage();
90 }
91
92 if (ofn && !(out = fopen(ofn, "w"))) {
93 fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
94 usage();
95 }
96
97 p_len = strlen(pattern);
98
99 if (p_len == 0) {
100 fprintf(stderr, "pattern cannot be empty\n");
101 usage();
102 }
103
104
105 while ((n = fread(buf, 1, sizeof(buf), in)) > 0) {
106 if (n < sizeof(buf)) {
107 if (ferror(in)) {
108 FREAD_ERROR:
109 fprintf(stderr, "fread error\n");
110 return EXIT_FAILURE;
111 }
112 }
113
114 p_off = xor_data(buf, n, pattern, p_len, p_off);
115
116 if (!fwrite(buf, n, 1, out)) {
117 FWRITE_ERROR:
118 fprintf(stderr, "fwrite error\n");
119 return EXIT_FAILURE;
120 }
121 }
122
123 if (ferror(in)) {
124 goto FREAD_ERROR;
125 }
126
127 if (fflush(out)) {
128 goto FWRITE_ERROR;
129 }
130
131 fclose(in);
132 fclose(out);
133
134 return EXIT_SUCCESS;
135 }