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/*
* motorola-bin.c
*
* Copyright (C) 2005 Mike Baker
* Openwrt.org
*
* $Id$
*
* 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 <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <string.h>
#include <netinet/in.h>
unsigned long *crc32;
void init_crc32()
{
unsigned long crc;
unsigned long poly = ntohl(0x2083b8ed);
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;
}
struct motorola {
unsigned int crc; // crc32 of the remainder
unsigned int flags; // unknown, 10577050
char *trx; // standard trx
};
int main(int argc, char **argv)
{
unsigned int len;
int fd;
void *trx;
struct motorola *firmware;
if (argc<3) {
printf("%s <trx> <motorola.bin>\n",argv[0]);
exit(0);
}
// mmap trx file
if (((fd = open(argv[1], O_RDONLY)) < 0)
|| ((len = lseek(fd, 0, SEEK_END)) < 0)
|| ((trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1))
|| (close(fd) < 0)) {
perror("open/malloc");
exit(-1);
}
// create a firmware image in memory
// and copy the trx to it
firmware = malloc(len+8);
memcpy(&firmware->trx,trx,len);
munmap(trx,len);
// setup the motorola headers
init_crc32();
firmware->flags = ntohl(0x10577050);
firmware->crc = htonl(crc32buf((char *)&firmware->flags,len+4));
// write the firmware
if (((fd = open(argv[2], O_CREAT|O_WRONLY,0644)) < 0)
|| (write(fd,firmware,len+8) != len+8)
|| (close(fd) < 0)) {
perror("write");
exit(-1);
}
free(firmware);
return 0;
}
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