projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 20effc67 TL |
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 | |
| 17 | inline | |
| 18 | std::size_t | |
| 19 | digest( | |
| 20 | char const* s, | |
| 21 | std::size_t n, | |
| 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; | |
| 32 | for(;n--;++s) | |
| 33 | hash = (*s ^ hash) * prime; | |
| 34 | return hash; | |
| 35 | } | |
| 36 | ||
| 37 | } // detail | |
| 38 | BOOST_JSON_NS_END | |
| 39 | ||
| 40 | #endif |