hex.h

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/*
Minetest
Copyright (C) 2013 Jonathan Neuschäfer <j.neuschaefer@gmx.net>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser 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.
*/
 
#pragma once
 
#include <string>
 
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(const std::string &data)
{
    return hex_encode(data.c_str(), 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;
}