41 lines
887 B
C++
41 lines
887 B
C++
//
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// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/json
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//
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#ifndef BOOST_JSON_DETAIL_DIGEST_HPP
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#define BOOST_JSON_DETAIL_DIGEST_HPP
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BOOST_JSON_NS_BEGIN
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namespace detail {
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// Calculate salted digest of string
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inline
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std::size_t
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digest(
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char const* s,
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std::size_t n,
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std::size_t salt) noexcept
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{
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#if BOOST_JSON_ARCH == 64
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std::uint64_t const prime = 0x100000001B3ULL;
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std::uint64_t hash = 0xcbf29ce484222325ULL;
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#else
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std::uint32_t const prime = 0x01000193UL;
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std::uint32_t hash = 0x811C9DC5UL;
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#endif
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hash += salt;
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for(;n--;++s)
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hash = (*s ^ hash) * prime;
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return hash;
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}
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} // detail
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BOOST_JSON_NS_END
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#endif
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