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+/* <MIT License>
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+ Copyright (c) 2013-2014 Marek Majkowski <marek@popcount.org>
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+
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+ Permission is hereby granted, free of charge, to any person obtaining a copy
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+ of this software and associated documentation files (the "Software"), to deal
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+ in the Software without restriction, including without limitation the rights
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+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ copies of the Software, and to permit persons to whom the Software is
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+ furnished to do so, subject to the following conditions:
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+
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+ The above copyright notice and this permission notice shall be included in
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+ all copies or substantial portions of the Software.
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+
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+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ THE SOFTWARE.
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+ </MIT License>
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+
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+ Original location:
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+ https://github.com/majek/csiphash/
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+
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+ Solution inspired by code from:
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+ Samuel Neves (supercop/crypto_auth/siphash24/little)
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+ djb (supercop/crypto_auth/siphash24/little2)
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+ Jean-Philippe Aumasson (https://131002.net/siphash/siphash24.c)
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+*/
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+
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+/* This code is extracted from csiphash.h */
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+
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+#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
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+ __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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+# define _le64toh(x) ((uint64_t)(x))
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+#elif defined(_WIN32)
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+/* Windows is always little endian, unless you're on xbox360
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+ http://msdn.microsoft.com/en-us/library/b0084kay(v=vs.80).aspx */
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+# define _le64toh(x) ((uint64_t)(x))
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+#elif defined(__APPLE__)
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+# include <libkern/OSByteOrder.h>
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+# define _le64toh(x) OSSwapLittleToHostInt64(x)
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+#elif defined(sun) || defined(__sun)
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+# include <sys/byteorder.h>
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+# define _le64toh(x) LE_64(x)
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+
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+#else
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+
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+/* See: http://sourceforge.net/p/predef/wiki/Endianness/ */
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+# if defined(__FreeBSD__) || defined(__NetBSD__) || defined(OpenBSD)
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+# include <sys/endian.h>
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+# else
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+# include <endian.h>
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+# endif
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+# if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && \
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+ __BYTE_ORDER == __LITTLE_ENDIAN
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+# define _le64toh(x) ((uint64_t)(x))
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+# else
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+# if defined(OpenBSD)
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+# define _le64toh(x) letoh64(x)
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+# else
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+# define _le64toh(x) le64toh(x)
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+# endif
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+# endif
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+
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+#endif
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