68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
/*
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Copyright (c) 2011-2018, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_RANDOM_HPP_INCLUDED
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#define TORRENT_RANDOM_HPP_INCLUDED
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#include "libtorrent/config.hpp"
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#include "libtorrent/span.hpp"
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#include <cstdint>
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#include <random>
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#include <algorithm>
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namespace libtorrent {
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namespace aux {
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TORRENT_EXTRA_EXPORT std::mt19937& random_engine();
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template <typename Range>
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void random_shuffle(Range& range)
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{
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std::shuffle(range.data(), range.data() + range.size(), random_engine());
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}
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// Fills the buffer with random bytes.
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//
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// This functions perform differently under different setups
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// For Windows and all platforms when compiled with libcrypto, it
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// generates cryptographically random bytes.
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// If the above conditions are not true, then a standard
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// fill of bytes is used.
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TORRENT_EXTRA_EXPORT void random_bytes(span<char> buffer);
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}
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TORRENT_EXTRA_EXPORT std::uint32_t random(std::uint32_t m);
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}
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#endif // TORRENT_RANDOM_HPP_INCLUDED
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