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https://github.com/OpenVPN/openvpn3.git
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97924d6c92
They are uint64_t. Usually size_t is a uint64_t as well, but not always (e.g. Win32). Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2022 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include <string>
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#include <cstdint> // for std::uint32_t, uint64_t
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#ifdef HAVE_XXHASH
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#define USE_OPENVPN_HASH
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#define XXH_INLINE_ALL
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#include <xxhash.h>
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#if XXH_VERSION_NUMBER < 700
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#error requires XXHash version 0.7.0 or higher
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#endif
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#endif
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/hexstr.hpp>
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#define OPENVPN_HASH_METHOD(T, meth) \
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namespace std { \
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template <> \
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struct hash<T> \
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{ \
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inline std::uint64_t operator()(const T &obj) const \
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{ \
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return obj.meth(); \
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} \
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}; \
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}
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#ifdef USE_OPENVPN_HASH
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namespace openvpn {
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class Hash64
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{
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public:
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Hash64(const std::uint64_t init_hashval = 0)
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: hashval(init_hashval)
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{
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}
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void operator()(const void *data, const std::size_t size)
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{
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hashval = XXH3_64bits_withSeed((const char *)data, size, hashval);
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}
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void operator()(const std::string &str)
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{
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(*this)(str.c_str(), str.length());
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}
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template <typename T>
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inline void operator()(const T &obj)
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{
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static_assert(std::is_pod<T>::value, "Hash64: POD type required");
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(*this)(&obj, sizeof(obj));
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}
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std::uint64_t value() const
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{
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return hashval;
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}
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std::string to_string() const
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{
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return render_hex_number(hashval);
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}
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private:
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std::uint64_t hashval;
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};
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} // namespace openvpn
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#endif
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