common/image.c

/*
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, wd@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
 */
#ifndef USE_HOSTCC
# include <common.h>
# include <watchdog.h>
#else
# include "mkimage.h"
#endif

#include <image.h>

unsigned long crc32 (unsigned long, const unsigned char *, unsigned int);

int image_check_hcrc (image_header_t *hdr)
{
	ulong hcrc;
	ulong len = image_get_header_size ();
	image_header_t header;

	/* Copy header so we can blank CRC field for re-calculation */
	memmove (&header, (char *)hdr, image_get_header_size ());
	image_set_hcrc (&header, 0);

	hcrc = crc32 (0, (unsigned char *)&header, len);

	return (hcrc == image_get_hcrc (hdr));
}

int image_check_dcrc (image_header_t *hdr)
{
	ulong data = image_get_data (hdr);
	ulong len = image_get_data_size (hdr);
	ulong dcrc = crc32 (0, (unsigned char *)data, len);

	return (dcrc == image_get_dcrc (hdr));
}

int image_check_dcrc_wd (image_header_t *hdr, ulong chunksz)
{
	ulong dcrc = 0;
	ulong len = image_get_data_size (hdr);
	ulong data = image_get_data (hdr);

#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
	ulong cdata = data;
	ulong edata = cdata + len;

	while (cdata < edata) {
		ulong chunk = edata - cdata;

		if (chunk > chunksz)
			chunk = chunksz;
		dcrc = crc32 (dcrc, (unsigned char *)cdata, chunk);
		cdata += chunk;

		WATCHDOG_RESET ();
	}
#else
	dcrc = crc32 (0, (unsigned char *)data, len);
#endif

	return (dcrc == image_get_dcrc (hdr));
}

int getenv_verify (void)
{
	char *s = getenv ("verify");
	return (s && (*s == 'n')) ? 0 : 1;
}