percent_encoding.hpp

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#pragma once
#ifndef _KURLYK_UTILS_PERCENT_ENCODING_HPP_INCLUDED
#define _KURLYK_UTILS_PERCENT_ENCODING_HPP_INCLUDED

 
namespace kurlyk::utils {

    inline std::string percent_encode(const std::string &value) noexcept {
        static const char hex_chars[] = "0123456789ABCDEF";
 
        std::string result;
        result.reserve(value.size()); // Reserve minimum required size
 
        for (auto &chr : value) {
            if (isalnum(static_cast<unsigned char>(chr)) || chr == '-' || chr == '.' || chr == '_' || chr == '~') {
                result += chr;
            } else {
                result += '%';
                result += hex_chars[static_cast<unsigned char>(chr) >> 4];
                result += hex_chars[static_cast<unsigned char>(chr) & 0x0F];
            }
        }
 
        return result;
    }

    inline std::string percent_decode(const std::string &value) noexcept {
        std::string result;
        result.reserve(value.size() / 3 + (value.size() % 3)); // Reserve minimum required size
 
        for (std::size_t i = 0; i < value.size(); ++i) {
            if (value[i] == '%' && i + 2 < value.size()) {
                char hex[] = { value[i + 1], value[i + 2], '\0' };
                char decoded_chr = static_cast<char>(std::strtol(hex, nullptr, 16));
                result += decoded_chr;
                i += 2;
            } else if (value[i] == '+') {
                result += ' ';
            } else {
                result += value[i];
            }
        }
 
        return result;
    }
 
} // namespace kurlyk::utils
 
#endif