/**
 * server/src/utils/tohex.hpp
 *
 * This file is part of the traintastic source code.
 *
 * Copyright (C) 2019-2020,2022 Reinder Feenstra
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef TRAINTASTIC_SERVER_UTILS_TOHEX_HPP
#define TRAINTASTIC_SERVER_UTILS_TOHEX_HPP

#include <string>
#include <string_view>
#include <type_traits>

static const std::string_view toHexDigits = "0123456789ABCDEF";

template<typename T, typename = std::enable_if_t<std::is_trivially_copyable_v<T> && !std::is_pointer_v<T>>>
std::string toHex(T value, size_t length = sizeof(T) * 2)
{
  std::string s(length, '0');
  for(size_t i = 0, j = length - 1; i < length; i++, j--)
    s[j] = toHexDigits[(value >> (i * 4)) & 0xf];
  return s;
}

std::string toHex(const void* buffer, size_t size);

inline std::string toHex(std::string_view value)
{
  return toHex(value.data(), value.size());
}

#endif
