std::string curl_easy::unescape()

in src/Windows/curl_easy.cpp [419:467]

• 49 lines of code
• 7 McCabe index (conditional complexity)

std::string curl_easy::unescape(const std::string& encoded) const
{
    std::string decodedHeader;
    for (auto it = encoded.begin(); it != encoded.end(); ++it)
    {
        if (*it == '%')
        {
            char byteValue;
            ++it;
            if (it == encoded.end())
            {
                throw_on_error(
                    EBADMSG, "Malformed URL encoding in header " + encoded);
            }
            char ch = *it;
            int8_t hexValue = Int8FromHexAscii(ch);
            if (hexValue < 0)
            {
                std::stringstream ss;
                ss << "Bogus hex value " << (uint8_t)ch << "(" << ch
                   << ") in URL encoding in header " << encoded;
                throw_on_error(EBADMSG, ss.str());
            }
            byteValue = hexValue << 4;
            ++it;
            if (it == encoded.end())
            {
                throw_on_error(
                    EBADMSG, "Malformed URL encoding in header " + encoded);
            }
            ch = *it;
            hexValue = Int8FromHexAscii(ch);
            if (hexValue < 0)
            {
                std::stringstream ss;
                ss << "Bogus hex value " << (uint8_t)ch << "(" << ch
                   << ") in URL encoding in header " << encoded;
                throw_on_error(EBADMSG, ss.str());
            }
            byteValue |= hexValue & 0xf;
            decodedHeader.push_back(byteValue);
        }
        else
        {
            decodedHeader.push_back(*it);
        }
    }
    return decodedHeader;
}