+/*
+ * trx.c
+ *
+ * Copyright (C) 2005 Mike Baker
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#include <sys/ioctl.h>
+#include "mtd-api.h"
+#include "mtd.h"
+
+#define TRX_MAGIC 0x30524448 /* "HDR0" */
+struct trx_header {
+ unsigned magic; /* "HDR0" */
+ unsigned len; /* Length of file including header */
+ unsigned crc32; /* 32-bit CRC from flag_version to end of file */
+ unsigned flag_version; /* 0:15 flags, 16:31 version */
+ unsigned offsets[3]; /* Offsets of partitions from start of header */
+};
+
+static unsigned long *crc32 = NULL;
+
+static void init_crc32()
+{
+ unsigned long crc;
+ unsigned long poly = 0xEDB88320L;
+ int n, bit;
+
+ if (crc32)
+ return;
+
+ crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long));
+ if (!crc32) {
+ perror("malloc");
+ exit(1);
+ }
+
+ for (n = 0; n < 256; n++) {
+ crc = (unsigned long) n;
+ for (bit = 0; bit < 8; bit++)
+ crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
+ crc32[n] = crc;
+ }
+}
+
+static unsigned int crc32buf(char *buf, size_t len)
+{
+ unsigned int crc = 0xFFFFFFFF;
+ for (; len; len--, buf++)
+ crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
+ return crc;
+}
+
+int
+trx_fixup(int fd, const char *name)
+{
+ struct mtd_info_user mtdInfo;
+ unsigned long len;
+ struct trx_header *trx;
+ void *ptr, *scan;
+ int bfd;
+
+ if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
+ fprintf(stderr, "Failed to get mtd info\n");
+ goto err;
+ }
+
+ len = mtdInfo.size;
+ if (mtdInfo.size <= 0) {
+ fprintf(stderr, "Invalid MTD device size\n");
+ goto err;
+ }
+
+ bfd = mtd_open(name, true);
+ ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
+ if (!ptr || (ptr == (void *) -1)) {
+ perror("mmap");
+ goto err1;
+ }
+
+ trx = ptr;
+ if (trx->magic != TRX_MAGIC) {
+ fprintf(stderr, "TRX header not found\n");
+ goto err;
+ }
+
+ init_crc32();
+ scan = ptr + offsetof(struct trx_header, flag_version);
+ trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
+ msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
+ munmap(ptr, len);
+ close(bfd);
+ return 0;
+
+err1:
+ close(bfd);
+err:
+ fprintf(stderr, "Error fixing up TRX header\n");
+ return -1;
+}
+
+int
+trx_check(int imagefd, const char *mtd, char *buf, int *len)
+{
+ const struct trx_header *trx = (const struct trx_header *) buf;
+ int fd;
+
+ if (strcmp(mtd, "linux") != 0)
+ return 1;
+
+ *len = read(imagefd, buf, 32);
+ if (*len < 32) {
+ fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
+ return 0;
+ }
+
+ if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
+ if (quiet < 2) {
+ fprintf(stderr, "Bad trx header\n");
+ fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
+ "Please specify the correct file or use -f to force.\n");
+ }
+ return 0;
+ }
+
+ /* check if image fits to mtd device */
+ fd = mtd_check_open(mtd);
+ if(fd < 0) {
+ fprintf(stderr, "Could not open mtd device: %s\n", mtd);
+ exit(1);
+ }
+
+ if(mtdsize < trx->len) {
+ fprintf(stderr, "Image too big for partition: %s\n", mtd);
+ close(fd);
+ return 0;
+ }
+
+ close(fd);
+ return 1;
+}
+
projects / openwrt.git / commitdiff