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: /*
: Copyright (c) 2025 Giuseppe Roberti.
: All rights reserved.
:
: Redistribution and use in source and binary forms, with or without modification,
: are permitted provided that the following conditions are met:
:
: 1. Redistributions of source code must retain the above copyright notice, this
: list of conditions and the following disclaimer.
:
: 2. Redistributions in binary form must reproduce the above copyright notice,
: this list of conditions and the following disclaimer in the documentation and/or
: other materials provided with the distribution.
:
: 3. Neither the name of the copyright holder nor the names of its contributors
: may be used to endorse or promote products derived from this software without
: specific prior written permission.
:
: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
: WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
: DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
: ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
: LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
: ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
: SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
: */
: #pragma once
:
: #include "nngxx/msg_body.h"
:
: #include "pars/init.h"
:
: #include <cstddef>
: #include <cstring>
: #include <format>
:
: namespace pars
: {
:
: static constexpr std::size_t hash_from_uuid(const std::string_view& uuid)
: {
0 / 1 : // see Fowler-Noll-Vo hash function
0 / 1 : constexpr std::uint64_t prime{0x100000001B3};
:
0 / 1 : if (uuid.size() != 36)
0 / 1 : throw std::runtime_error("Invalid UUID [size mismatch]");
:
0 / 1 : for (auto i : {8, 13, 18, 23})
: {
0 / 1 : if (uuid[i] != '-')
0 / 1 : throw std::runtime_error(
0 / 1 : std::format("Invalid UUID [missing separator {}]", i));
: }
:
0 / 1 : std::uint64_t result{0xcbf29ce484222325};
:
0 / 1 : for (const auto& c : uuid)
: {
0 / 1 : if (c == '-')
0 / 1 : continue;
:
0 / 1 : if (!(c >= '0' && c <= '9') && !(c >= 'A' && c <= 'F') &&
0 / 1 : !(c >= 'a' && c <= 'f'))
0 / 1 : throw std::runtime_error("Invalid UUID [non hex char found]");
:
0 / 1 : auto x = c - c >= 'a' ? ('a' - 10) : (c >= 'A' ? ('A' - 10) : '0');
:
0 / 1 : result = (result * prime) ^ x;
: }
:
0 / 1 : return result;
: }
:
: static std::size_t hash_from_msg(const nngxx::msg& m)
: {
0 / 1 : std::size_t h;
0 / 1 : if (m)
0 / 1 : if (m.body().size() >= sizeof(h))
0 / 1 : std::memcpy(&h, m.body().data<char>(), sizeof(h));
0 / 1 : else
0 / 1 : h = 0xffffffffffffffff;
0 / 1 : else
0 / 1 : h = 0x0000000000000000;
0 / 1 : return h;
: }
:
: } // namespace pars
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