hex.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 Jonathan Neuschäfer <j.neuschaefer@gmx.net>
 
#pragma once
 
#include <string>
#include <string_view>
 
static const char hex_chars[] = "0123456789abcdef";
 
[[nodiscard]]
static inline std::string hex_encode(std::string_view data)
{
        std::string ret;
        ret.reserve(data.size() * 2);
        for (unsigned char c : data) {
                ret.push_back(hex_chars[(c & 0xf0) >> 4]);
                ret.push_back(hex_chars[c & 0x0f]);
        }
        return ret;
}
 
[[nodiscard]]
static inline std::string hex_encode(const char *data, size_t data_size)
{
        if (!data_size)
                return "";
        return hex_encode(std::string_view(data, data_size));
}
 
static inline bool hex_digit_decode(char hexdigit, unsigned char &value)
{
        if (hexdigit >= '0' && hexdigit <= '9')
                value = hexdigit - '0';
        else if (hexdigit >= 'A' && hexdigit <= 'F')
                value = hexdigit - 'A' + 10;
        else if (hexdigit >= 'a' && hexdigit <= 'f')
                value = hexdigit - 'a' + 10;
        else
                return false;
        return true;
}