lib/plat/windows/windows-fds.c

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#endif
#include "private-lib-core.h"

struct lws *
wsi_from_fd(const struct lws_context *context, lws_sockfd_type fd)
{
	int h = LWS_FD_HASH(fd);
	int n = 0;

	for (n = 0; n < context->fd_hashtable[h].length; n++)
		if (context->fd_hashtable[h].wsi[n]->desc.sockfd == fd)
			return context->fd_hashtable[h].wsi[n];

	return NULL;
}

int
insert_wsi(struct lws_context *context, struct lws *wsi)
{
	int h = LWS_FD_HASH(wsi->desc.sockfd);

	if (context->fd_hashtable[h].length == (getdtablesize() - 1)) {
		lwsl_err("hash table overflow\n");
		return 1;
	}

	context->fd_hashtable[h].wsi[context->fd_hashtable[h].length++] = wsi;

	return 0;
}

int
delete_from_fd(struct lws_context *context, lws_sockfd_type fd)
{
	int h = LWS_FD_HASH(fd);
	int n = 0;

	for (n = 0; n < context->fd_hashtable[h].length; n++)
		if (context->fd_hashtable[h].wsi[n]->desc.sockfd == fd) {
			while (n < context->fd_hashtable[h].length) {
				context->fd_hashtable[h].wsi[n] =
					context->fd_hashtable[h].wsi[n + 1];
				n++;
			}
			context->fd_hashtable[h].length--;

			return 0;
		}

	lwsl_err("Failed to find fd %d requested for "
		 "delete in hashtable\n", fd);
	return 1;
}