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1 | // |
2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | |
3 | // | |
4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | // Official repository: https://github.com/boostorg/json | |
8 | // | |
9 | ||
10 | #ifndef BOOST_JSON_DETAIL_DIGEST_HPP | |
11 | #define BOOST_JSON_DETAIL_DIGEST_HPP | |
12 | ||
13 | BOOST_JSON_NS_BEGIN | |
14 | namespace detail { | |
15 | ||
16 | // Calculate salted digest of string | |
1e59de90 | 17 | template<class ForwardIterator> |
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18 | std::size_t |
19 | digest( | |
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20 | ForwardIterator b, |
21 | ForwardIterator e, | |
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22 | std::size_t salt) noexcept |
23 | { | |
24 | #if BOOST_JSON_ARCH == 64 | |
25 | std::uint64_t const prime = 0x100000001B3ULL; | |
26 | std::uint64_t hash = 0xcbf29ce484222325ULL; | |
27 | #else | |
28 | std::uint32_t const prime = 0x01000193UL; | |
29 | std::uint32_t hash = 0x811C9DC5UL; | |
30 | #endif | |
31 | hash += salt; | |
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32 | for(; b != e; ++b) |
33 | hash = (*b ^ hash) * prime; | |
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34 | return hash; |
35 | } | |
36 | ||
37 | } // detail | |
38 | BOOST_JSON_NS_END | |
39 | ||
40 | #endif |