165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
/*
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* trx.c
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*
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* Copyright (C) 2005 Mike Baker
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* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include "mtd-api.h"
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#include "mtd.h"
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#define TRX_MAGIC 0x30524448 /* "HDR0" */
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struct trx_header {
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unsigned magic; /* "HDR0" */
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unsigned len; /* Length of file including header */
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unsigned crc32; /* 32-bit CRC from flag_version to end of file */
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unsigned flag_version; /* 0:15 flags, 16:31 version */
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unsigned offsets[3]; /* Offsets of partitions from start of header */
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};
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static unsigned long *crc32 = NULL;
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static void init_crc32()
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{
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unsigned long crc;
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unsigned long poly = 0xEDB88320L;
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int n, bit;
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if (crc32)
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return;
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crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long));
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if (!crc32) {
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perror("malloc");
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exit(1);
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}
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for (n = 0; n < 256; n++) {
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crc = (unsigned long) n;
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for (bit = 0; bit < 8; bit++)
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crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
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crc32[n] = crc;
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}
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}
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static unsigned int crc32buf(char *buf, size_t len)
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{
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unsigned int crc = 0xFFFFFFFF;
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for (; len; len--, buf++)
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crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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return crc;
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}
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int
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trx_fixup(int fd, const char *name)
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{
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struct mtd_info_user mtdInfo;
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unsigned long len;
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struct trx_header *trx;
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void *ptr, *scan;
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int bfd;
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if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
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fprintf(stderr, "Failed to get mtd info\n");
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goto err;
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}
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len = mtdInfo.size;
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if (mtdInfo.size <= 0) {
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fprintf(stderr, "Invalid MTD device size\n");
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goto err;
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}
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bfd = mtd_open(name, true);
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ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
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if (!ptr || (ptr == (void *) -1)) {
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perror("mmap");
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goto err1;
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}
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trx = ptr;
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if (trx->magic != TRX_MAGIC) {
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fprintf(stderr, "TRX header not found\n");
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goto err;
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}
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init_crc32();
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scan = ptr + offsetof(struct trx_header, flag_version);
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trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
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msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
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munmap(ptr, len);
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close(bfd);
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return 0;
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err1:
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close(bfd);
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err:
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fprintf(stderr, "Error fixing up TRX header\n");
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return -1;
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}
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int
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trx_check(int imagefd, const char *mtd, char *buf, int *len)
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{
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const struct trx_header *trx = (const struct trx_header *) buf;
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int fd;
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if (strcmp(mtd, "linux") != 0)
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return 1;
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*len = read(imagefd, buf, 32);
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if (*len < 32) {
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fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
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return 0;
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}
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if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
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if (quiet < 2) {
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fprintf(stderr, "Bad trx header\n");
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fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
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"Please specify the correct file or use -f to force.\n");
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}
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return 0;
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}
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/* check if image fits to mtd device */
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fd = mtd_check_open(mtd);
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if(fd < 0) {
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fprintf(stderr, "Could not open mtd device: %s\n", mtd);
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exit(1);
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}
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if(mtdsize < trx->len) {
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fprintf(stderr, "Image too big for partition: %s\n", mtd);
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close(fd);
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return 0;
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}
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close(fd);
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return 1;
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}
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