Method open

src/SFML/Network/Ftp.cpp:532–593

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Ftp::Response Ftp::DataChannel::open(Ftp::TransferMode mode)
{
    // Open a data connection in active mode (we connect to the server)
    Ftp::Response response = m_ftp.sendCommand("PASV");
    if (response.isOk())
    {
        // Extract the connection address and port from the response
        const std::string::size_type begin = response.getMessage().find_first_of("0123456789");
        if (begin != std::string::npos)
        {
            std::array<std::uint8_t, 6> data{};
            std::string                 str   = response.getMessage().substr(begin);
            std::size_t                 index = 0;
            for (unsigned char& datum : data)
            {
                // Extract the current number
                while (std::isdigit(str[index]))
                {
                    datum = static_cast<std::uint8_t>(
                        static_cast<std::uint8_t>(datum * 10) + static_cast<std::uint8_t>(str[index] - '0'));
                    ++index;
                }

                // Skip separator
                ++index;
            }

            // Reconstruct connection port and address
            const auto      port = static_cast<std::uint16_t>(data[4] * 256 + data[5]);
            const IpAddress address(data[0], data[1], data[2], data[3]);

            // Connect the data channel to the server
            if (m_dataSocket.connect(address, port) == Socket::Status::Done)
            {
                // Translate the transfer mode to the corresponding FTP parameter
                std::string modeStr;
                switch (mode)
                {
                    case Ftp::TransferMode::Binary:
                        modeStr = "I";
                        break;
                    case Ftp::TransferMode::Ascii:
                        modeStr = "A";
                        break;
                    case Ftp::TransferMode::Ebcdic:
                        modeStr = "E";
                        break;
                }

                // Set the transfer mode
                response = m_ftp.sendCommand("TYPE", modeStr);
            }
            else
            {
                // Failed to connect to the server
                response = Ftp::Response(Ftp::Response::Status::ConnectionFailed);
            }
        }