Utils.hpp 1.64 KB
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/*
 *  This file is part of the mhwd - Manjaro Hardware Detection project
 *
 *  mhwd - Manjaro Hardware Detection
 *  Roland Singer <roland@manjaro.org>
 *  Łukasz Matysiak <december0123@gmail.com>
 *  Filipe Marques <eagle.software3@gmail.com>
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 *  Oscar Forner Martinez <oscar.forner.martinez@gmail.com>
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 *
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 *  Copyright (C) 2012 - 2016 Manjaro (http://manjaro.org)
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 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MHWDUTILS_HPP_
#define MHWDUTILS_HPP_

#include <string>
#include <cstdint>

namespace MhwdUtils
{

typedef std::uint64_t hash_t;

// Hardcoded values for the prime and the basis to calculate hash values.
constexpr hash_t prime = 0x100000001B3ull;
constexpr hash_t basis = 0xCBF29CE484222325ull;

constexpr hash_t hash_compile_time(char const* str, hash_t last_value = basis)
{
	return *str ? hash_compile_time(str+1, (*str ^ last_value) * prime) : last_value;
}
 
hash_t hash(char const* str)
{
	hash_t ret{basis};
 
	while(*str){
		ret ^= *str;
		ret *= prime;
		str++;
	}
 
	return ret;
}

}; // End namespace

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#endif /* CONFIG_HPP_ */