/* ****************************************************************************
 * stream/usb_stream.c -- open a “serial” USB stream using bulk reads and
 *                        writes (as used in Protocol 7).
 * Copyright (C) 2019 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of libcasio.
 * libcasio is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3.0 of the License,
 * or (at your option) any later version.
 *
 * libcasio 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with libcasio; if not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#include "stream.h"

TIO_HOOK(void) serial_usb_close(void *cookie)
{
	/* Nothing. */
}

TIO_HOOK(int) serial_usb_read(void *cookie, unsigned char *buffer, size_t size)
{
	/* Nothing. */
}

TIO_HOOK(int) serial_usb_write(void *cookie,
	unsigned char const *buffer, size_t size)
{
	/* Nothing. */
}

CASIO_LOCAL tio_functions_t const serial_usb_funcs = {
	(tio_close_t *)&serial_usb_close,

	(tio_read_t *)&serial_usb_read,
	(tio_write_t *)&serial_usb_write,
	NULL
};

int CASIO_EXPORT casio_open_serial_usb_stream(tio_stream_t **streamp,
	tio_stream_t *original)
{
	int terr;

	if (tio_get_type(original) != TIO_TYPE_USB) {
		msg((ll_error, "original stream wasn't a usb stream"));
		return (casio_error_arg);
	}

	terr = tio_open(streamp, original, NULL,
		TIO_OPENFLAG_READ | TIO_OPENFLAG_WRITE, &serial_usb_funcs, 0);
	if (terr) {
		msg((ll_error, "tio_open failed with error %s: %s",
			tio_error_name(terr), tio_error_desc(terr)));
		return (casio_error_unknown);
	}

	return (0);
}