1 files changed, 39 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/mkdcs932.c b/tools/firmware-utils/src/mkdcs932.c
new file mode 100644
index 0000000000..28c67aa3b3
--- /dev/null
+++ b/tools/firmware-utils/src/mkdcs932.c
@@ -0,0 +1,39 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License,
+ * version 2 as published by the Free Software Foundation.
+ *
+ * (C) John Crispin <blogic@openwrt.org>
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+
+int main(int argc, char **argv)
+{
+	uint32_t t = 0, sum = 0x55aa55aa;
+	int fd;
+
+	if ((argc != 2) || ((fd = open(argv[1], O_RDWR)) == -1)) {
+		fprintf(stderr, "Usage: %s input_file\n", *argv);
+		return -EINVAL;
+	}
+
+	lseek(fd, -4, SEEK_END);
+	write(fd, &t, 4);
+	lseek(fd, 0, SEEK_SET);
+
+	while (read(fd, &t, 4) > 0)
+		sum -= t;
+
+	lseek(fd, -4, SEEK_END);
+	write(fd, &sum, 4);
+	close(fd);
+
+	return 0;
+}