board/netstar/crcit.c

   1 /*
   2  * (C) Copyright 2005
   3  * 2N Telekomunikace, Ladislav Michl <michl@2n.cz>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <stdint.h>
  27 #include <fcntl.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include "crcek.h"
  33
  34 extern unsigned long crc32(unsigned long, const unsigned char *, unsigned int);
  35
  36 uint32_t data[LOADER_SIZE/4 + 3];
  37
  38 int doit(char *path, unsigned version)
  39 {
  40         uint32_t *p;
  41         ssize_t size;
  42         int fd;
  43
  44         fd = open(path, O_RDONLY);
  45         if (fd == -1) {
  46                 perror("Error opening file");
  47                 return EXIT_FAILURE;
  48         }
  49         p = data + 2;
  50         size = read(fd, p, LOADER_SIZE + 4);
  51         if (size == -1) {
  52                 perror("Error reading file");
  53                 return EXIT_FAILURE;
  54         }
  55         if (size > LOADER_SIZE) {
  56                 fprintf(stderr, "File too large\n");
  57                 return EXIT_FAILURE;
  58         }
  59         size = (((size - 1) >> 2) + 1) << 2;
  60         data[0] = size + 4;     /* add size of version field */
  61         data[1] = version;
  62         data[(size >> 2) + 2] = crc32(0, (unsigned char *)(data + 1), data[0]);
  63         close(fd);
  64
  65         if (write(STDOUT_FILENO, data, size + 3*4) == -1) {
  66                 perror("Error writing file");
  67                 return EXIT_FAILURE;
  68         }
  69
  70         return EXIT_SUCCESS;
  71 }
  72
  73 int main(int argc, char **argv)
  74 {
  75         if (argc == 2) {
  76                 return doit(argv[1], 0);
  77         } else if ((argc == 4) && (strcmp(argv[1], "-v") == 0)) {
  78                 char *endptr, *nptr = argv[2];
  79                 unsigned ver = strtoul(nptr, &endptr, 0);
  80                 if (*nptr != '\0' && *endptr == '\0')
  81                         return doit(argv[3], ver);
  82         }
  83         fprintf(stderr, "Usage: crcit [-v version] <image>\n");
  84
  85         return EXIT_FAILURE;
  86 }