/*
 * lar - LinuxBIOS archiver
 *
 * Copyright (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>
#include <console/loglevel.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

// FIXME: this should go into a header
int printk(int msg_level, const char *fmt, ...);


int find_file(struct mem_file *archive, char *filename, struct mem_file *result)
{
	char * walk, *fullname;
	struct lar_header * header;
	printk(BIOS_INFO, "filename is %s\n", filename);
printk(BIOS_INFO, "start 0x%x len 0x%x\n", archive->start, archive->len);
	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);
printk(BIOS_INFO, "fullname is %s\n", fullname);
		// FIXME: check checksum
		
		if(strcmp(fullname, filename)==0) {
			result->start=walk + ntohl(header->offset);
			result->len=ntohl(header->len);
			return 0;
		}

		// skip file
/*		FIXME: This is doing the wrong thing. its skipping too much.
		walk += ( ntohl(header->offset) + ntohl(header->len)
				+ 15 ) & 0xfffffff0;
 */
		walk += 16;
	}
printk(BIOS_INFO, "return 1! walk %p archive->start %p start _+ len %p\n", walk, archive->start, (char *)archive->start + 
                        archive->len);
	return 1;
}

int copy_file(struct mem_file *archive, char *filename, void *where)
{
	int ret;
	struct mem_file result;

	ret = find_file(archive, filename, &result);
	if (ret) {
		printk(BIOS_INFO, "copy_file: no such name %s\n", filename);
		return 1;
	}

	memcpy(where, result.start, result.len);

	return 0;
}


int run_file(struct mem_file *archive, char *filename, void *where)
{
	int (*v)(void);

	if (copy_file(archive, filename, where)){
		printk(BIOS_INFO, "run file %s failed: ENOENT\n", filename);
		return 1;
	}

	v = where;
	return v();
	
}