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/* $Id$ */
/*
 * Copyright (c) 2011 Dimitri Sokolyuk <demon@dim13.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "bootloader.h"

int
transfer(int fd, struct page *p, int pages, int pagesize)
{
	int	n, off;
	unsigned char sum;

	fprintf(stderr, "waiting for bootloader ...");
	while (get(fd) != '+')
		;

	fprintf(stderr, "\nwriting: ");

	for (n = 0; n < pages; n++) {
		fprintf(stderr, "%c", ".o"[p[n].dirty]);

		if (p[n].dirty) {
			put('@', fd);
			put(n, fd);
			sum = n;
			for (off = 0; off < pagesize; off++) {
				put(p[n].data[off], fd);
				sum += p[n].data[off];
			}
			put(sum, fd);
			switch (get(fd)) {
			case '.':
				break;	/* success, next page */
			case '!':
				n--;	/* error stay on the same page */
				fprintf(stderr, "E");
				break;
			default:
				goto fubar;
			}
		}
	}

fubar:

	fprintf(stderr, "\nrebooting\n");
	put('-', fd);

	return 0;
}

int
main(int argc, char **argv)
{
	struct	page *p;
	char	*dev = "/dev/ttyU0";
	int	c, fd;

	while ((c = getopt(argc, argv, "f:")) != -1)
		switch (c) {
		case 'f':
			dev = strdup(optarg);
			break;
		default:
			break;
		}

	argc -= optind;
	argv += optind;

	if (argc != 1)
		return -1;

	p = rdhex(argv[0], PAGENUM, PAGESIZE);
	assert(p);
	assert(p[120].dirty == 0);	/* protect firmware */

	fd = open_tty(dev);
	if (fd == -1) {
		perror(dev);
		return -1;
	}
	transfer(fd, p, PAGENUM, PAGESIZE);
	close(fd);

	freehex(p, PAGENUM);

	return 0;
}