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AK: Add a simple randomness API

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This can be used in code that builds on non-Serenity platforms.
This commit is contained in:
Andreas Kling 2020-05-27 12:25:46 +02:00
parent e53fa97cfb
commit 9a113b0229
1 changed files with 60 additions and 0 deletions
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Platform.h>
#include <AK/Types.h>
#if defined(__serenity__)
# include <stdlib.h>
#endif
#if defined(__linux__)
# include <unistd.h>
#endif
namespace AK {
inline void fill_with_random(void* buffer, size_t length)
{
#if defined(__serenity__)
arc4random_buf(buffer, length);
#elif defined(__linux__)
int rc = getentropy(buffer, length);
(void)rc;
#endif
}
template<typename T>
inline T get_random()
{
T t;
fill_with_random(&t, sizeof(T));
return t;
}
}