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62 lines
2.0 KiB
62 lines
2.0 KiB
/* |
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Copyright (c) 2011-2012, 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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#include "libtorrent/random.hpp" |
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namespace libtorrent |
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{ |
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namespace |
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{ |
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boost::uint32_t x = 123456789; |
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} |
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void random_seed(boost::uint32_t v) |
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{ |
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x = v; |
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} |
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// this is an xorshift random number generator |
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// see: http://en.wikipedia.org/wiki/Xorshift |
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boost::uint32_t random() |
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{ |
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static boost::uint32_t y = 362436069; |
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static boost::uint32_t z = 521288629; |
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static boost::uint32_t w = 88675123; |
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boost::uint32_t t; |
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t = x ^ (x << 11); |
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x = y; y = z; z = w; |
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return w = w ^ (w >> 19) ^ (t ^ (t >> 8)); |
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} |
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} |
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