int
main(int argc, char *argv[])
{
	off_t size;
	uint32_t tmp;
	uint8_t *buf, crc[4], crc128k[4], *rgb;
	int fd, ofd, rgbfd;

	if (argc != 4) {
		fprintf(stderr, "usage: %s lk.rom rgb565le.raw lknew.rom\n",
		    argv[0]);
		exit(EXIT_FAILURE);
	}

	memset(crc, 0, sizeof(crc));
	memset(crc128k, 0, sizeof(crc128k));

	if ((ofd = open(argv[3], O_RDWR | O_CREAT | O_TRUNC, 0666)) == -1)
		err(EXIT_FAILURE, "%s", argv[3]);

	if ((fd = open(argv[1], O_RDONLY)) == -1)
		err(EXIT_FAILURE, "%s", argv[1]);
	if ((size = lseek(fd, 0, SEEK_END)) == -1)
		err(EXIT_FAILURE, "%s", argv[1]);
	if ((buf = mmap(NULL, size, PROT_READ, MAP_SHARED | MAP_FILE, fd, 0))
	    == MAP_FAILED)
		err(EXIT_FAILURE, "%s", argv[1]);

	if ((rgbfd = open(argv[2], O_RDONLY)) == -1)
		err(EXIT_FAILURE, "%s", argv[2]);
	if ((rgb = mmap(NULL, 768000, PROT_READ, MAP_SHARED | MAP_FILE,
	    rgbfd, 0)) == MAP_FAILED)
		err(EXIT_FAILURE, "%s", argv[2]);

	size -= 774716;

	tmp = 0;
	TCCCRC(tmp, buf, 16);
	TCCCRC(tmp, crc, 4);
	TCCCRC(tmp, buf + 28, size - 28);
	TCCCRC(tmp, rgb, 768000);
	TCCCRC(tmp, buf + size + 768000, 774716 - 768000);
	crc[0] = (tmp >> 0) & 0xff;
	crc[1] = (tmp >> 8) & 0xff;
	crc[2] = (tmp >> 16) & 0xff;
	crc[3] = (tmp >> 24) & 0xff;

	tmp = 0;
	TCCCRC(tmp, buf, 16);
	TCCCRC(tmp, crc, 4);
	TCCCRC(tmp, buf + 28, 131072 - 28);
	crc128k[0] = (tmp >> 0) & 0xff;
	crc128k[1] = (tmp >> 8) & 0xff;
	crc128k[2] = (tmp >> 16) & 0xff;
	crc128k[3] = (tmp >> 24) & 0xff;

	tmp = 0;

	write(ofd, buf, 16);
	write(ofd, crc128k, 4);
	write(ofd, &tmp, 4);
	write(ofd, crc, 4);
	write(ofd, buf + 28, size - 28);
	write(ofd, rgb, 768000);
	write(ofd, buf + size + 768000, 774716 - 768000);

	size += 774716;

	munmap(rgb, 768000);
	close(rgbfd);
	munmap(buf, size);
	close(fd);
	close(ofd);

	return EXIT_SUCCESS;
}