U-Boot

/*
 * (C) Copyright 2000-2004
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2003
 * Kai-Uwe Bloem, Auerswald GmbH & Co KG, <linux-development@auerswald.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
 */

#if defined(CONFIG_CMD_XIMG)

/*
 * Multi Image extract
 */
#include <common.h>
#include <command.h>
#include <image.h>
#include <asm/byteorder.h>

int
do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	ulong addr = load_addr, dest = 0;
	ulong data, len, checksum;
	ulong *len_ptr;
	int i, verify, part = 0;
	char pbuf[10], *s;
	image_header_t header;

	s = getenv("verify");
	verify = (s && (*s == 'n')) ? 0 : 1;

	if (argc > 1) {
		addr = simple_strtoul(argv[1], NULL, 16);
	}
	if (argc > 2) {
		part = simple_strtoul(argv[2], NULL, 16);
	}
	if (argc > 3) {
		dest = simple_strtoul(argv[3], NULL, 16);
	}

	printf("## Copying from image at %08lx ...\n", addr);

	/* Copy header so we can blank CRC field for re-calculation */
	memmove(&header, (char *) addr, sizeof (image_header_t));

	if (ntohl(header.ih_magic) != IH_MAGIC) {
		printf("Bad Magic Number\n");
		return 1;
	}

	data = (ulong) & header;
	len = sizeof (image_header_t);

	checksum = ntohl(header.ih_hcrc);
	header.ih_hcrc = 0;

	if (crc32(0, (char *) data, len) != checksum) {
		printf("Bad Header Checksum\n");
		return 1;
	}
#ifdef DEBUG
	print_image_hdr((image_header_t *) addr);
#endif

	data = addr + sizeof (image_header_t);
	len = ntohl(header.ih_size);

	if (header.ih_type != IH_TYPE_MULTI) {
		printf("Wrong Image Type for %s command\n", cmdtp->name);
		return 1;
	}

	if (header.ih_comp != IH_COMP_NONE) {
		printf("Wrong Compression Type for %s command\n", cmdtp->name);
		return 1;
	}

	if (verify) {
		printf("   Verifying Checksum ... ");
		if (crc32(0, (char *) data, len) != ntohl(header.ih_dcrc)) {
			printf("Bad Data CRC\n");
			return 1;
		}
		printf("OK\n");
	}

	len_ptr = (ulong *) data;

	data += 4;		/* terminator */
	for (i = 0; len_ptr[i]; ++i) {
		data += 4;
		if (argc > 2 && part > i) {
			u_long tail;
			len = ntohl(len_ptr[i]);
			tail = len % 4;
			data += len;
			if (tail) {
				data += 4 - tail;
			}
		}
	}
	if (argc > 2 && part >= i) {
		printf("Bad Image Part\n");
		return 1;
	}
	len = ntohl(len_ptr[part]);

	if (argc > 3) {
		memcpy((char *) dest, (char *) data, len);
	}

	sprintf(pbuf, "%8lx", data);
	setenv("fileaddr", pbuf);
	sprintf(pbuf, "%8lx", len);
	setenv("filesize", pbuf);

	return 0;
}

U_BOOT_CMD(imxtract, 4, 1, do_imgextract,
	   "imxtract- extract a part of a multi-image\n",
	   "addr part [dest]\n"
	   "    - extract <part> from image at <addr> and copy to <dest>\n");

#endif