/*
   * (C) Copyright 2007
   * Heiko Schocher, DENX Software Engineering, <hs@denx.de>
   *
   * See file CREDITS for list of people who contributed to this
   * project.
   *
   * 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 "os_support.h"

  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <string.h>

  #include <sys/stat.h>
  #include "sha1.h"

  int main (int argc, char **argv)
  {
  	unsigned char output[20];
  	int i, len;
  
  	char	*imagefile;
  	char	*cmdname = *argv;
  	unsigned char	*ptr;
  	unsigned char	*data;
  	struct stat sbuf;
  	unsigned char	*ptroff;
  	int	ifd;
  	int	off;
  
  	if (argc > 1) {
  		imagefile = argv[1];
  		ifd = open (imagefile, O_RDWR|O_BINARY);
  		if (ifd < 0) {
  			fprintf (stderr, "%s: Can't open %s: %s
  ",
  				cmdname, imagefile, strerror(errno));
  			exit (EXIT_FAILURE);
  		}
  		if (fstat (ifd, &sbuf) < 0) {
  			fprintf (stderr, "%s: Can't stat %s: %s
  ",
  				cmdname, imagefile, strerror(errno));
  			exit (EXIT_FAILURE);
  		}
  		len = sbuf.st_size;
  		ptr = (unsigned char *)mmap(0, len,
  				    PROT_READ, MAP_SHARED, ifd, 0);
  		if (ptr == (unsigned char *)MAP_FAILED) {
  			fprintf (stderr, "%s: Can't read %s: %s
  ",
  				cmdname, imagefile, strerror(errno));
  			exit (EXIT_FAILURE);
  		}

  		/* create a copy, so we can blank out the sha1 sum */
  		data = malloc (len);
  		memcpy (data, ptr, len);
  		off = SHA1_SUM_POS;
  		ptroff = &data[len +  off];
  		for (i = 0; i < SHA1_SUM_LEN; i++) {
  			ptroff[i] = 0;
  		}

  		sha1_csum ((unsigned char *) data, len, (unsigned char *)output);
  
  		printf ("U-Boot sum:
  ");

  	        for (i = 0; i < 20 ; i++) {

  	            printf ("%02X ", output[i]);
  	        }
  	        printf ("
  ");
  		/* overwrite the sum in the bin file, with the actual */
  		lseek (ifd, SHA1_SUM_POS, SEEK_END);
  		if (write (ifd, output, SHA1_SUM_LEN) != SHA1_SUM_LEN) {
  			fprintf (stderr, "%s: Can't write %s: %s
  ",
  				cmdname, imagefile, strerror(errno));
  			exit (EXIT_FAILURE);
  		}

  		free (data);
  		(void) munmap((void *)ptr, len);
  		(void) close (ifd);
  	}
  
  	return EXIT_SUCCESS;
  }