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";
 
static inline std::string hex_encode(const char *data, unsigned int data_size)
{
        std::string ret;
        ret.reserve(data_size * 2);
 
        char buf2[3];
        buf2[2] = '\0';
 
        for (unsigned int i = 0; i < data_size; i++) {
                unsigned char c = (unsigned char)data[i];
                buf2[0] = hex_chars[(c & 0xf0) >> 4];
                buf2[1] = hex_chars[c & 0x0f];
                ret.append(buf2);
        }
 
        return ret;
}
 
static inline std::string hex_encode(std::string_view data)
{
        return hex_encode(data.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;
}