From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 tools/firmware-utils/src/mkbrnimg.c | 189 ++++++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 tools/firmware-utils/src/mkbrnimg.c

(limited to 'tools/firmware-utils/src/mkbrnimg.c')

diff --git a/tools/firmware-utils/src/mkbrnimg.c b/tools/firmware-utils/src/mkbrnimg.c
new file mode 100644
index 0000000..b7a73ff
--- /dev/null
+++ b/tools/firmware-utils/src/mkbrnimg.c
@@ -0,0 +1,189 @@
+/*
+ * mkbrnimg.c - partially based on OpenWrt's wndr3700.c
+ *
+ * Copyright (C) 2011 Tobias Diedrich <ranma+openwrt@tdiedrich.de>
+ *
+ * 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.
+ *
+ * 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 <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <inttypes.h>
+
+#define BPB 8 /* bits/byte */
+
+static uint32_t crc32[1<<BPB];
+
+static char *output_file = "default-brnImage";
+static uint32_t magic = 0x12345678;
+static char *signature = "BRNDTW502";
+static uint32_t crc32_poly = 0x2083b8ed;
+
+static void init_crc32()
+{
+	const uint32_t poly = ntohl(crc32_poly);
+	int n;
+
+	for (n = 0; n < 1<<BPB; n++) {
+		uint32_t crc = n;
+		int bit;
+
+		for (bit = 0; bit < BPB; bit++)
+			crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
+		crc32[n] = crc;
+	}
+}
+
+static uint32_t crc32buf(unsigned char *buf, size_t len)
+{
+	uint32_t crc = 0xFFFFFFFF;
+
+	for (; len; len--, buf++)
+		crc = crc32[(uint8_t)crc ^ *buf] ^ (crc >> BPB);
+	return ~crc;
+}
+
+static void usage(const char *) __attribute__ (( __noreturn__ ));
+
+static void usage(const char *mess)
+{
+	fprintf(stderr, "Error: %s\n", mess);
+	fprintf(stderr, "Usage: mkbrnimg [-o output_file] [-m magic] [-s signature] [-p crc32 poly] kernel_file [additional files]\n");
+	fprintf(stderr, "\n");
+	exit(1);
+}
+
+static void parseopts(int *argc, char ***argv)
+{
+	char *endptr;
+	int res;
+
+	while ((res = getopt(*argc, *argv, "o:m:s:p:")) != -1) {
+		switch (res) {
+		default:
+			usage("Unknown option");
+			break;
+		case 'o':
+			output_file = optarg;
+			break;
+		case 'm':
+			magic = strtoul(optarg, &endptr, 0);
+			if (endptr == optarg || *endptr != 0)
+				usage("magic must be a decimal or hexadecimal 32-bit value");
+			break;
+		case 's':
+			signature = optarg;
+			break;
+		case 'p':
+			crc32_poly = strtoul(optarg, &endptr, 0);
+			if (endptr == optarg || *endptr != 0)
+				usage("'crc32 poly' must be a decimal or hexadecimal 32-bit value");
+			break;
+		}
+	}
+	*argc -= optind;
+	*argv += optind;
+}
+
+static void appendfile(int outfd, char *path, int kernel) {
+	int fd;
+	size_t len, padded_len;
+	char *input_file;
+	uint32_t crc;
+	char padding[0x400];
+	char footer[12];
+
+	memset(padding, 0xff, sizeof(padding));
+
+	// mmap input_file
+	if ((fd = open(path, O_RDONLY))  < 0
+	|| (len = lseek(fd, 0, SEEK_END)) < 0
+	|| (input_file = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1)
+	|| close(fd) < 0)
+	{
+		fprintf(stderr, "Error mapping file '%s': %s\n", path, strerror(errno));
+		exit(1);
+	}
+
+	// kernel should be lzma compressed image, not uImage
+	if (kernel &&
+	    (input_file[0] != (char)0x5d ||
+	     input_file[1] != (char)0x00 ||
+	     input_file[2] != (char)0x00 ||
+	     input_file[3] != (char)0x80)) {
+		fprintf(stderr, "lzma signature not found on kernel image.\n");
+		exit(1);
+	}
+
+	init_crc32();
+	crc = crc32buf(input_file, len);
+	fprintf(stderr, "crc32 for '%s' is %08x.\n", path, crc);
+
+	// write the file
+	write(outfd, input_file, len);
+
+	// write padding
+	padded_len = ((len + sizeof(footer) + sizeof(padding) - 1) & ~(sizeof(padding) - 1)) - sizeof(footer);
+	fprintf(stderr, "len=%08zx padded_len=%08zx\n", len, padded_len);
+	write(outfd, padding, padded_len - len);
+
+	// write footer
+	footer[0]  = (len   >>  0) & 0xff;
+	footer[1]  = (len   >>  8) & 0xff;
+	footer[2]  = (len   >> 16) & 0xff;
+	footer[3]  = (len   >> 24) & 0xff;
+	footer[4]  = (magic >>  0) & 0xff;
+	footer[5]  = (magic >>  8) & 0xff;
+	footer[6]  = (magic >> 16) & 0xff;
+	footer[7]  = (magic >> 24) & 0xff;
+	footer[8]  = (crc   >>  0) & 0xff;
+	footer[9]  = (crc   >>  8) & 0xff;
+	footer[10] = (crc   >> 16) & 0xff;
+	footer[11] = (crc   >> 24) & 0xff;
+	write(outfd, footer, sizeof(footer));
+
+	munmap(input_file, len);
+}
+
+int main(int argc, char **argv)
+{
+	int outfd;
+	int i;
+
+	parseopts(&argc, &argv);
+
+	if (argc < 1)
+		usage("wrong number of arguments");
+
+	if ((outfd = open(output_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
+	{
+		fprintf(stderr, "Error opening '%s' for writing: %s\n", output_file, strerror(errno));
+		exit(1);
+	}
+
+	for (i=0; i<argc; i++) {
+		appendfile(outfd, argv[i], i == 0);
+	}
+	write(outfd, signature, strlen(signature)+1);
+	close(outfd);
+
+	return 0;
+}
-- 
cgit v1.2.3