From fa4ca9d7eb3b33d7e52c6f724e957f82080f9aa1 Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Mon, 7 Oct 2013 15:01:05 +0000
Subject: [PATCH] tools: add tool to generate dcs93xl images

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 38317
---
 tools/firmware-utils/Makefile       |  1 +
 tools/firmware-utils/src/mkdcs932.c | 39 +++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 tools/firmware-utils/src/mkdcs932.c

diff --git a/tools/firmware-utils/Makefile b/tools/firmware-utils/Makefile
index 45690f5949e..770fcf5fd46 100644
--- a/tools/firmware-utils/Makefile
+++ b/tools/firmware-utils/Makefile
@@ -65,6 +65,7 @@ define Host/Compile
 	$(call cc,fix-u-media-header cyg_crc32,-Wall)
 	$(call cc,hcsmakeimage bcmalgo)
 	$(call cc,mkporayfw, -Wall)
+	$(call cc,mkdcs932, -Wall)
 endef
 
 define Host/Install
diff --git a/tools/firmware-utils/src/mkdcs932.c b/tools/firmware-utils/src/mkdcs932.c
new file mode 100644
index 00000000000..28c67aa3b30
--- /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;
+}