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84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_CRYPTO_MURMURHASH_H_INCLUDED
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#define BEAST_CRYPTO_MURMURHASH_H_INCLUDED
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#include "../CStdInt.h"
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// Original source code links in .cpp file
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namespace beast {
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namespace Murmur {
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extern void MurmurHash3_x86_32 (const void* key, int len, uint32 seed, void* out);
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extern void MurmurHash3_x86_128 (const void* key, int len, uint32 seed, void* out);
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extern void MurmurHash3_x64_128 (const void* key, int len, uint32 seed, void* out);
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// Uses Beast to choose an appropriate routine
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// This handy template deduces which size hash is desired
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template <typename HashType>
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inline void Hash (const void* key, int len, uint32 seed, HashType* out)
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{
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switch (8 * sizeof (HashType))
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{
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case 32:
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MurmurHash3_x86_32 (key, len, seed, out);
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break;
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#if BEAST_64BIT
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case 64:
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{
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HashType tmp[2];
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MurmurHash3_x64_128 (key, len, seed, &tmp[0]);
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*out = tmp[0];
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}
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break;
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case 128:
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MurmurHash3_x64_128 (key, len, seed, out);
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break;
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#else
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case 64:
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{
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HashType tmp[2];
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MurmurHash3_x86_128 (key, len, seed, &tmp[0]);
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*out = tmp[0];
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}
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break;
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case 128:
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MurmurHash3_x86_128 (key, len, seed, out);
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break;
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#endif
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default:
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Throw (std::runtime_error ("invalid key size in MurmurHash"));
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break;
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};
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}
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}
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}
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#endif
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