diff options
Diffstat (limited to 'package/base-files/src/jffs2root.c')
| -rw-r--r-- | package/base-files/src/jffs2root.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/package/base-files/src/jffs2root.c b/package/base-files/src/jffs2root.c new file mode 100644 index 0000000000..14662fc945 --- /dev/null +++ b/package/base-files/src/jffs2root.c @@ -0,0 +1,133 @@ +/* + * jffs2root.c + * + * Copyright (C) 2005 Mike Baker + * + * 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. + * + * $Id$ + * + */ + +#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 <linux/mtd/mtd.h> + +#define FILENAME "/dev/mtdblock/1" + +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 */ +}; + +unsigned long *crc32; + +void init_crc32() +{ + unsigned long crc; + unsigned long poly = 0xEDB88320L; + int n, bit; + if ((crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) { + 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; + } +} + +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 main(int argc, char **argv) +{ + int fd; + struct mtd_info_user mtdInfo; + unsigned long len; + struct trx_header *ptr; + char *buf; + + if (((fd = open(FILENAME, O_RDWR)) < 0) + || ((len = lseek(fd, 0, SEEK_END)) < 0) + || ((ptr = (struct trx_header *) mmap(0, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) + || (ptr->magic != 0x30524448)) { + printf("Error reading trx info\n"); + exit(-1); + } + close (fd); + + if (((fd = open("/dev/mtd/1", O_RDWR)) < 0) + || (ioctl(fd, MEMGETINFO, &mtdInfo))) { + fprintf(stderr, "Could not get MTD device info from %s\n", FILENAME); + close(fd); + exit(1); + } + close(fd); + + if (argc > 1 && !strcmp(argv[1],"--move")) { + if (ptr->offsets[2] >= ptr->len) { + printf("Partition already moved outside trx\n"); + } else { + init_crc32(); + ptr->offsets[2] += (mtdInfo.erasesize - 1); + ptr->offsets[2] &= ~(mtdInfo.erasesize - 1); + ptr->len = ptr->offsets[2]; + ptr->crc32 = crc32buf((void *) &(ptr->flag_version), ptr->len - offsetof(struct trx_header, flag_version)); + msync(ptr,sizeof(struct trx_header),MS_SYNC|MS_INVALIDATE); + printf("Partition moved; please reboot\n"); + } + } else if (argc > 1 && !strcmp(argv[1], "--clean")) { + buf = (char *) ptr; + if (buf[ptr->offsets[1] - 1] == 0) { + init_crc32(); + buf[ptr->offsets[1] - 1] = 1; + ptr->crc32 = crc32buf((void *) &(ptr->flag_version), ptr->len - offsetof(struct trx_header, flag_version)); + msync(ptr,sizeof(struct trx_header),MS_SYNC|MS_INVALIDATE); + printf("Partition marked as clean\n"); + } + } else { + int x; + printf(" erase: 0x%08x\n",mtdInfo.erasesize); + printf("=== trx ===\n"); + printf("mapped: 0x%08x\n", (unsigned)ptr); + printf(" magic: 0x%08x\n", ptr->magic); + printf(" len: 0x%08x\n", ptr->len); + printf(" crc: 0x%08x\n", ptr->crc32); + for (x = 0; x < 3; x++) + printf(" offset[%d]: 0x%08x\n", x, ptr->offsets[x]); + } + + munmap((void *) ptr, len); + return 0; +} |