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/*
 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
 *
 * 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.
 */

#include "inner.h"

#if 0
/* obsolete */

/*
 * If BR_USE_URANDOM is not defined, then try to autodetect its presence
 * through compiler macros.
 */
#ifndef BR_USE_URANDOM

/*
 * Macro values documented on:
 *    https://sourceforge.net/p/predef/wiki/OperatingSystems/
 *
 * Only the most common systems have been included here for now. This
 * should be enriched later on.
 */
#if defined _AIX \
	|| defined __ANDROID__ \
	|| defined __FreeBSD__ \
	|| defined __NetBSD__ \
	|| defined __OpenBSD__ \
	|| defined __DragonFly__ \
	|| defined __linux__ \
	|| (defined __sun && (defined __SVR4 || defined __svr4__)) \
	|| (defined __APPLE__ && defined __MACH__)
#define BR_USE_URANDOM   1
#endif

#endif

/*
 * If BR_USE_WIN32_RAND is not defined, perform autodetection here.
 */
#ifndef BR_USE_WIN32_RAND

#if defined _WIN32 || defined _WIN64
#define BR_USE_WIN32_RAND   1
#endif

#endif

#if BR_USE_URANDOM
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#endif

#if BR_USE_WIN32_RAND
#include <windows.h>
#include <wincrypt.h>
#pragma comment(lib, "advapi32")
#endif

#endif

/* ==================================================================== */
/*
 * This part of the file does the low-level record management.
 */

/*
 * IMPLEMENTATION NOTES
 * ====================
 *
 * In this file, we designate by "input" (and the "i" letter) the "recv"
 * operations: incoming records from the peer, from which payload data
 * is obtained, and must be extracted by the application (or the SSL
 * handshake engine). Similarly, "output" (and the "o" letter) is for
 * "send": payload data injected by the application (and SSL handshake
 * engine), to be wrapped into records, that are then conveyed to the