mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-26 05:28:58 +02:00
21db875713
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@513 3c298f89-4303-0410-b956-a3cf2f4a3e73
119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/*
|
|
* 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>
|
|
|
|
|
|
#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;
|
|
unsigned long len;
|
|
struct trx_header *ptr;
|
|
unsigned offset;
|
|
|
|
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);
|
|
}
|
|
|
|
/* treat last partition as rootfs offset */
|
|
offset = ptr->offsets[2] ? : ptr->offsets[1];
|
|
|
|
if (argc > 1 && !strcmp(argv[1],"--move")) {
|
|
if (offset >= ptr->len) {
|
|
printf("Partition already moved outside trx\n");
|
|
#if 0
|
|
} else if (offset & 0x0001ffff) {
|
|
printf("Partition does not start on a block boundary\n");
|
|
#endif
|
|
} else {
|
|
init_crc32();
|
|
//bzero((void *)((int)ptr + ptr->len), (size_t)(len - ptr->len));
|
|
ptr->len = offset;
|
|
ptr->crc32 = crc32buf((void *) &(ptr->flag_version), ptr->len - offsetof(struct trx_header, flag_version));
|
|
msync(ptr,len,MS_SYNC|MS_INVALIDATE);
|
|
printf("Partition moved; please reboot\n");
|
|
}
|
|
} else {
|
|
int x;
|
|
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, sizeof(struct trx_header));
|
|
return 0;
|
|
}
|