diff options
Diffstat (limited to 'package/mtd/src/trx.c')
| -rw-r--r-- | package/mtd/src/trx.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/package/mtd/src/trx.c b/package/mtd/src/trx.c new file mode 100644 index 0000000..5457a36 --- /dev/null +++ b/package/mtd/src/trx.c @@ -0,0 +1,165 @@ +/* + * 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; +} + |