--- /dev/null
+/*
+ * Make CHK Image
+ *
+ * This utility creates Netgear .chk files.
+ *
+ * Copyright (C) 2008 Dave C. Reeve <Dave.Reeve@dreeve.org>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+#define BUF_LEN (2048)
+
+#define MAX_BOARD_ID_LEN (64)
+
+struct chk_header {
+ uint32_t magic;
+ uint32_t header_len;
+ uint8_t reserved[8];
+ uint32_t kernel_chksum;
+ uint32_t rootfs_chksum;
+ uint32_t kernel_len;
+ uint32_t rootfs_len;
+ uint32_t image_chksum;
+ uint32_t header_chksum;
+ /* char board_id[] - upto MAX_BOARD_ID_LEN */
+};
+
+static void __attribute__ ((format (printf, 2, 3)))
+fatal_error (int maybe_errno, const char * format, ...)
+{
+ va_list ap;
+
+ fprintf (stderr, "mkchkimg: ");
+ va_start (ap, format);
+ vfprintf (stderr, format, ap);
+ va_end (ap);
+
+ if (maybe_errno) {
+ fprintf (stderr, ": %s\n", strerror (maybe_errno));
+ } else {
+ fprintf (stderr, "\n");
+ }
+
+ exit (EXIT_FAILURE);
+}
+
+static void __attribute__ ((format (printf, 1, 2)))
+message (const char * format, ...)
+{
+ va_list ap;
+
+ fprintf (stderr, "mkchkimg: ");
+ va_start (ap, format);
+ vfprintf (stderr, format, ap);
+ va_end (ap);
+ fprintf (stderr, "\n");
+}
+
+struct ngr_checksum {
+ uint32_t c0;
+ uint32_t c1;
+};
+
+static inline void
+netgear_checksum_init (struct ngr_checksum * c)
+{
+ c->c0 = c->c1 = 0;
+}
+
+static inline void
+netgear_checksum_add (struct ngr_checksum * c, unsigned char * buf, size_t len)
+{
+ size_t i;
+
+ for (i=0; i<len; i++) {
+ c->c0 += buf[i] & 0xff;
+ c->c1 += c->c0;
+ }
+}
+
+static inline unsigned long
+netgear_checksum_fini (struct ngr_checksum * c)
+{
+ uint32_t b, checksum;
+
+ b = (c->c0 & 65535) + ((c->c0 >> 16) & 65535);
+ c->c0 = ((b >> 16) + b) & 65535;
+ b = (c->c1 & 65535) + ((c->c1 >> 16) & 65535);
+ c->c1 = ((b >> 16) + b) & 65535;
+ checksum = ((c->c1 << 16) | c->c0);
+ return checksum;
+}
+
+static void
+print_help (void)
+{
+ fprintf (stderr, "Usage: mkchkimg -o output -k kernel [-f filesys] [-b board_id] [-r region]\n");
+}
+
+int
+main (int argc, char * argv[])
+{
+ int opt;
+ char * ptr;
+ size_t len;
+ size_t header_len;
+ struct chk_header * hdr;
+ struct ngr_checksum chk_part, chk_whole;
+ char buf[BUF_LEN];
+ char * output_file, * kern_file, * fs_file;
+ FILE * out_fp, * kern_fp, * fs_fp;
+ char * board_id;
+ unsigned long region;
+
+ /* Default values */
+ board_id = "U12H072T00_NETGEAR";
+ region = 1; /* 1=WW, 2=NA */
+ output_file = NULL;
+ kern_file = NULL;
+ fs_file = NULL;
+ fs_fp = NULL;
+
+ while ((opt = getopt (argc, argv, ":b:r:k:f:o:h")) != -1) {
+ switch (opt) {
+ case 'b':
+ /* Board Identity */
+ if (strlen (optarg) > MAX_BOARD_ID_LEN) {
+ fatal_error (0, "Board lenght exceeds %d",
+ MAX_BOARD_ID_LEN);
+ }
+ board_id = optarg;
+ break;
+
+ case 'r':
+ /* Region */
+ errno = 0;
+ region = strtoul (optarg, &ptr, 0);
+ if (errno || ptr==optarg || *ptr!='\0') {
+ fatal_error (0, "Cannot parse region %s", optarg);
+ }
+ if (region > 0xff) {
+ fatal_error (0, "Region cannot exceed 0xff");
+ }
+ break;
+
+ case 'k':
+ /* Kernel */
+ kern_file = optarg;
+ break;
+
+ case 'f':
+ /* Filing System */
+ fs_file = optarg;
+ break;
+
+ case 'o':
+ /* Output file */
+ output_file = optarg;
+ break;
+
+ case 'h':
+ print_help ();
+ return EXIT_SUCCESS;
+
+ case ':':
+ print_help ();
+ fatal_error (0, "Option -%c missing argument", optopt);
+ break;
+
+ case '?':
+ print_help ();
+ fatal_error (0, "Unknown argument -%c", optopt);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ /* Check we have all the options expected */
+ if (!kern_file) {
+ print_help ();
+ fatal_error (0, "Kernel file expected");
+ }
+ if (!output_file) {
+ print_help ();
+ fatal_error (0, "Output file required");
+ }
+ message ("Netgear CHK writer - v0.1");
+
+ /* Open the input file */
+ kern_fp = fopen (kern_file, "r");
+ if (!kern_fp) {
+ fatal_error (errno, "Cannot open %s", kern_file);
+ }
+
+ /* Open the fs file, if specified */
+ if (fs_file) {
+ fs_fp = fopen (fs_file, "r");
+ if (!fs_fp) {
+ fatal_error (errno, "Cannot open %s", fs_file);
+ }
+ }
+
+ /* Open the output file */
+ out_fp = fopen (output_file, "w+");
+ if (!out_fp) {
+ fatal_error (errno, "Cannot open %s", output_file);
+ }
+
+ /* Write zeros when the chk header will be */
+ buf[0] = '\0';
+ header_len = sizeof (struct chk_header) + strlen (board_id);
+ if (fwrite (buf, 1, header_len, out_fp) != header_len) {
+ fatal_error (errno, "Cannot write header");
+ }
+
+ /* Allocate storage for header, we fill in as we go */
+ hdr = malloc (sizeof (struct chk_header));
+ if (!hdr) {
+ fatal_error (0, "malloc failed");
+ }
+ bzero (hdr, sizeof (struct chk_header));
+
+ /* Fill in known values */
+ hdr->magic = htonl (0x2a23245e);
+ hdr->header_len = htonl(header_len);
+ hdr->reserved[0] = (unsigned char)(region & 0xff);
+ hdr->reserved[1] = 1; /* Major */
+ hdr->reserved[2] = 1; /* Minor */
+ hdr->reserved[3] = 99; /* Build */
+ hdr->reserved[4] = 0; /* Unknown t1 ? was 1 */
+ hdr->reserved[5] = 0; /* Unknonw t2 ? was 0 */
+ hdr->reserved[6] = 0; /* Unknonw t3 ? was 1 */
+ hdr->reserved[7] = 0; /* Unused ? */
+ message (" Board Id: %s", board_id);
+ message (" Region: %s", region == 1 ? "World Wide (WW)"
+ : (region == 2 ? "North America (NA)" : "Unknown"));
+
+ /* Copy the trx file, calculating the checksum as we go */
+ netgear_checksum_init (&chk_part);
+ netgear_checksum_init (&chk_whole);
+ while (!feof (kern_fp)) {
+ len = fread (buf, 1, BUF_LEN, kern_fp);
+ if (len < 1) {
+ break;
+ }
+ if (fwrite (buf, len, 1, out_fp) != 1) {
+ fatal_error (errno, "Write error");
+ }
+ hdr->kernel_len += len;
+ netgear_checksum_add (&chk_part, (unsigned char *)buf, len);
+ netgear_checksum_add (&chk_whole, (unsigned char *)buf, len);
+ }
+ hdr->kernel_chksum = netgear_checksum_fini (&chk_part);
+ message (" Kernel Len: %u", hdr->kernel_len);
+ message ("Kernel Checksum: 0x%08x", hdr->kernel_chksum);
+ hdr->kernel_len = htonl (hdr->kernel_len);
+ hdr->kernel_chksum = htonl (hdr->kernel_chksum);
+
+ /* Now copy the root fs, calculating the checksum as we go */
+ if (fs_fp) {
+ netgear_checksum_init (&chk_part);
+ while (!feof (fs_fp)) {
+ len = fread (buf, 1, BUF_LEN, fs_fp);
+ if (len < 1) {
+ break;
+ }
+ if (fwrite (buf, len, 1, out_fp) != 1) {
+ fatal_error (errno, "Write error");
+ }
+ hdr->rootfs_len += len;
+ netgear_checksum_add (&chk_part, (unsigned char *)buf, len);
+ netgear_checksum_add (&chk_whole, (unsigned char *)buf, len);
+ }
+ hdr->rootfs_chksum = (netgear_checksum_fini (&chk_part));
+ message (" Rootfs Len: %u", hdr->rootfs_len);
+ message ("Rootfs Checksum: 0x%08x", hdr->rootfs_chksum);
+ hdr->rootfs_len = htonl (hdr->rootfs_len);
+ hdr->rootfs_chksum = htonl (hdr->rootfs_chksum);
+ }
+
+ /* Calcautate the image checksum */
+ hdr->image_chksum = netgear_checksum_fini (&chk_whole);
+ message (" Image Checksum: 0x%08x", hdr->image_chksum);
+ hdr->image_chksum = htonl (hdr->image_chksum);
+
+ /* Calculate the header checksum */
+ netgear_checksum_init (&chk_part);
+ netgear_checksum_add (&chk_part, (unsigned char *)hdr,
+ sizeof (struct chk_header));
+ netgear_checksum_add (&chk_part, (unsigned char *)board_id,
+ strlen (board_id));
+ hdr->header_chksum = htonl (netgear_checksum_fini (&chk_part));
+
+ /* Finally rewind the output and write headers */
+ rewind (out_fp);
+ if (fwrite (hdr, sizeof (struct chk_header), 1, out_fp) != 1) {
+ fatal_error (errno, "Cannot write header");
+ }
+ if (fwrite (board_id, strlen (board_id), 1, out_fp) != 1) {
+ fatal_error (errno, "Cannot write board id");
+ }
+
+ /* Success */
+ return EXIT_SUCCESS;
+}
+
projects / openwrt / staging / lynxis.git / commitdiff