110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
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/*
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* motorola-bin.c
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*
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* Copyright (C) 2005 Mike Baker
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* Openwrt.org
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*
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* $Id$
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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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*/
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#include <stdio.h>
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#include <stdlib.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 <string.h>
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#include <netinet/in.h>
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unsigned long *crc32;
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void init_crc32()
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{
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unsigned long crc;
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unsigned long poly = ntohl(0x2083b8ed);
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int n, bit;
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if ((crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) {
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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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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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struct motorola {
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unsigned int crc; // crc32 of the remainder
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unsigned int flags; // unknown, 10577050
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char *trx; // standard trx
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};
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int main(int argc, char **argv)
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{
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unsigned int len;
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int fd;
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void *trx;
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struct motorola *firmware;
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if (argc<3) {
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printf("%s <trx> <motorola.bin>\n",argv[0]);
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exit(0);
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}
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// mmap trx file
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if (((fd = open(argv[1], O_RDONLY)) < 0)
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|| ((len = lseek(fd, 0, SEEK_END)) < 0)
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|| ((trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1))
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|| (close(fd) < 0)) {
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perror("open/malloc");
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exit(-1);
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}
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// create a firmware image in memory
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// and copy the trx to it
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firmware = malloc(len+8);
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memcpy(&firmware->trx,trx,len);
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munmap(trx,len);
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// setup the motorola headers
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init_crc32();
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firmware->flags = ntohl(0x10577050);
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firmware->crc = htonl(crc32buf((char *)&firmware->flags,len+4));
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// write the firmware
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if (((fd = open(argv[2], O_CREAT|O_WRONLY,0644)) < 0)
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|| (write(fd,firmware,len+8) != len+8)
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|| (close(fd) < 0)) {
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perror("write");
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exit(-1);
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}
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free(firmware);
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return 0;
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}
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