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-rw-r--r--tools/firmware-utils/src/xorimage.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/xorimage.c b/tools/firmware-utils/src/xorimage.c
new file mode 100644
index 0000000000..b5ab83fa7a
--- /dev/null
+++ b/tools/firmware-utils/src/xorimage.c
@@ -0,0 +1,135 @@
+/*
+ * xorimage.c - partially based on OpenWrt's addpattern.c
+ *
+ * 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 <string.h>
+#include <stdint.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+static char default_pattern[] = "12345678";
+
+
+int xor_data(uint8_t *data, size_t len, const uint8_t *pattern, int p_len, int p_off)
+{
+ int offset = p_off;
+ while (len--) {
+ *data ^= pattern[offset];
+ data++;
+ offset = (offset + 1) % p_len;
+ }
+ return offset;
+}
+
+
+void usage(void) __attribute__ (( __noreturn__ ));
+
+void usage(void)
+{
+ fprintf(stderr, "Usage: xorimage [-i infile] [-o outfile] [-p <pattern>]\n");
+ exit(EXIT_FAILURE);
+}
+
+
+int main(int argc, char **argv)
+{
+ char buf[1024]; /* keep this at 1k or adjust garbage calc below */
+ FILE *in = stdin;
+ FILE *out = stdout;
+ char *ifn = NULL;
+ char *ofn = NULL;
+ const char *pattern = default_pattern;
+ int c;
+ int v0, v1, v2;
+ size_t n;
+ int p_len, p_off = 0;
+
+ while ((c = getopt(argc, argv, "i:o:p:h")) != -1) {
+ switch (c) {
+ case 'i':
+ ifn = optarg;
+ break;
+ case 'o':
+ ofn = optarg;
+ break;
+ case 'p':
+ pattern = optarg;
+ break;
+ case 'h':
+ default:
+ usage();
+ }
+ }
+
+ if (optind != argc || optind == 1) {
+ fprintf(stderr, "illegal arg \"%s\"\n", argv[optind]);
+ usage();
+ }
+
+ if (ifn && !(in = fopen(ifn, "r"))) {
+ fprintf(stderr, "can not open \"%s\" for reading\n", ifn);
+ usage();
+ }
+
+ if (ofn && !(out = fopen(ofn, "w"))) {
+ fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
+ usage();
+ }
+
+ p_len = strlen(pattern);
+
+ if (p_len == 0) {
+ fprintf(stderr, "pattern cannot be empty\n");
+ usage();
+ }
+
+
+ while ((n = fread(buf, 1, sizeof(buf), in)) > 0) {
+ if (n < sizeof(buf)) {
+ if (ferror(in)) {
+ FREAD_ERROR:
+ fprintf(stderr, "fread error\n");
+ return EXIT_FAILURE;
+ }
+ }
+
+ p_off = xor_data(buf, n, pattern, p_len, p_off);
+
+ if (!fwrite(buf, n, 1, out)) {
+ FWRITE_ERROR:
+ fprintf(stderr, "fwrite error\n");
+ return EXIT_FAILURE;
+ }
+ }
+
+ if (ferror(in)) {
+ goto FREAD_ERROR;
+ }
+
+ if (fflush(out)) {
+ goto FWRITE_ERROR;
+ }
+
+ fclose(in);
+ fclose(out);
+
+ return EXIT_SUCCESS;
+}