windows: Handle the case where there are no serial ports at all.

[libserialport.git] / windows_ddk.c

/*
 * This file is part of the libserialport project.
 *
 * Copyright (C) 2019 Martin Ling <martin-libserialport@earth.li>
 *
 * This program 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 of the
 * License, or (at your option) any later version.
 *
 * 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 Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * We can't include DDK headers in serialport.c because they conflict with
 * user space headers. So this file exists to isolate the definitions which
 * use the kernel declarations.
 */

#include <ddk/wdm.h>

const size_t WRITEFILE_MAX_SIZE = ((65535 - sizeof(MDL)) / sizeof(ULONG_PTR)) * PAGE_SIZE;