/* ****************************************************************************
 * stream/open_usb.c -- open a USB stream.
 * Copyright (C) 2017 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"

#if   !defined(LIBCASIO_DISABLED_LIBUSB)
# define OUF &casio_open_libusb_usb
#elif !defined(LIBCASIO_DISABLED_WINDOWS)
# define OUF &casio_open_windows_usb
#else
# define OUF NULL
#endif

CASIO_LOCAL casio_open_usb_stream_t *open_usb_stream_func = OUF;

/**
 *	casio_set_open_usb_stream_func:
 *	Set the USB streams opener.
 *
 *	NULL rests the function to its default.
 *
 *	@arg	function	the function pointer to set.
 *	@return				the error code (0 if ok).
 */

int CASIO_EXPORT casio_set_open_usb_stream_func(casio_open_usb_stream_t *func)
{
	open_usb_stream_func = func ? func : OUF;
	return (0);
}

/**
 *	casio_open_usb_stream:
 *	Open the USB stream.
 *
 *	@arg	stream		the stream to make.
 *	@arg	bus			the USB bus on which to find the device.
 *						-1 if any device on any bus (and address is not read).
 *	@arg	address		the address on the bus of the device.
 *						-1 if any device on the bus.
 *	@return				the error code (0 if ok).
 */

int CASIO_EXPORT casio_open_usb_stream(casio_stream_t **streamp,
	int bus, int address)
{
	if (bus < -1 || bus > 255 || address < -1 || address > 255)
		return (casio_error_op);
	if (!open_usb_stream_func)
		return (casio_error_op);

	return ((*open_usb_stream_func)(streamp, bus, address));
}