/*
 * lar - LinuxBIOS archiver
 *
 * Copright (C) 2006-2007 coresystems GmbH
 * Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH
 *
 * 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; version 2 of the License.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
 *
 */

#include <arch/types.h>
#include <string.h>
#include <lar.h>

#ifndef CONFIG_BIG_ENDIAN
#define ntohl(x) ( ((x&0xff)<<24) | ((x&0xff00)<<8) | \
		((x&0xff0000) >> 8) | ((x&0xff000000) >> 24) )
#else
#define ntohl(x) (x)
#endif

int find_file(struct mem_file *archive, char *filename, struct mem_file *result)
{
	char * walk, *fullname;
	struct lar_header * header;
	
	for (walk = archive->start; walk < (char *)archive->start + 
			archive->len; walk+=16) {

		if(strcmp(walk, MAGIC)!=0)
			continue;

		header=(struct lar_header *)walk;
		fullname=walk+sizeof(struct lar_header);

		// FIXME: check checksum
		
		if(strcmp(fullname, filename)!=0) {
			result->start=walk + ntohl(header->offset);
			result->len=ntohl(header->len);
			return 0;
		}

		// skip file
		walk += ( ntohl(header->offset) + ntohl(header->len)
				+ 15 ) & 0xfffffff0;
	}

	return 1;
}