public function encode($nt_domain, $client_hostname, $negotiate_flags = null)
    {
        // Get our default negotiate flags if none were supplied
        $negotiate_flags = (null === $negotiate_flags) ? static::getDefaultNegotiateFlags() : $negotiate_flags;

        $nt_domain_supplied = false;
        $client_hostname_supplied = false;

        if ((NegotiateFlag::NEGOTIATE_OEM_DOMAIN_SUPPLIED & $negotiate_flags)
            === NegotiateFlag::NEGOTIATE_OEM_DOMAIN_SUPPLIED) {
            $nt_domain_supplied = true;

            $nt_domain = $this->encoding_converter->convert(
                strtoupper($nt_domain),
                static::OEM_ENCODING
            );
        } else {
            // If the domain supplied flag isn't set, set the domain to an empty byte string
            $nt_domain = '';
        }

        if ((NegotiateFlag::NEGOTIATE_OEM_WORKSTATION_SUPPLIED & $negotiate_flags)
            === NegotiateFlag::NEGOTIATE_OEM_WORKSTATION_SUPPLIED) {
            $client_hostname_supplied = true;

            $client_hostname = $this->encoding_converter->convert(
                strtoupper($client_hostname),
                static::OEM_ENCODING
            );
        } else {
            // If the hostname supplied flag isn't set, set the domain to an empty byte string
            $client_hostname = '';
        }

        // Determine and calculate some values
        $payload_offset = static::calculatePayloadOffset($negotiate_flags);
        $domain_name_length = strlen($nt_domain);
        $hostname_length = strlen($client_hostname);

        /**
         * Determine the payload offsets of the domain name and hostname
         *
         * The specification says that these offsets should be set to valid
         * locations even if the negotation flags don't contain the flags
         * denoting their inclusion, however some NTLM servers seem to throw a
         * bit of a fit if the offsets are set to non-zero values when the flags
         * don't denote their inclusion.
         *
         * So yea, we're breaking spec here to appease some seemingly old or
         * improper implementations. cURL does the same here.
         *
         * @link https://msdn.microsoft.com/en-us/library/cc236641.aspx
         * @link https://github.com/bagder/curl/blob/curl-7_46_0/lib/curl_ntlm_msgs.c#L364-L370
         */
        $domain_name_offset = $nt_domain_supplied ? $payload_offset : 0;
        $hostname_offset = $client_hostname_supplied ? ($payload_offset + $domain_name_length) : 0;

        // Prepare a binary string to be returned
        $binary_string = '';

        $binary_string .= static::SIGNATURE; // 8-byte signature
        $binary_string .= pack('V', static::MESSAGE_TYPE); // 32-bit unsigned little-endian

        $binary_string .= pack('V', $negotiate_flags); // 32-bit unsigned little-endian

        // Domain name fields: length; length; offset of the domain value from the beginning of the message
        $binary_string .= pack('v', $domain_name_length); // 16-bit unsigned little-endian
        $binary_string .= pack('v', $domain_name_length); // 16-bit unsigned little-endian
        $binary_string .= pack('V', $domain_name_offset); // 32-bit unsigned little-endian, 1st value in the payload

        // Hostname fields: length; length; offset of the hostname value from the beginning of the message
        $binary_string .= pack('v', $hostname_length); // 16-bit unsigned little-endian
        $binary_string .= pack('v', $hostname_length); // 16-bit unsigned little-endian
        $binary_string .= pack('V', $hostname_offset); // 32-bit unsigned little-endian, 2nd value

        // NOTE: Omitting the version data here. It's unnecessary.

        // Add our payload data
        $binary_string .= $nt_domain;
        $binary_string .= $client_hostname;

        return $binary_string;
    }
public function encode($nt_domain, $client_hostname, $negotiate_flags = null)
    {
        // Get our default negotiate flags if none were supplied
        $negotiate_flags = (null === $negotiate_flags) ? static::getDefaultNegotiateFlags() : $negotiate_flags;

        $nt_domain_supplied = false;
        $client_hostname_supplied = false;

        if ((NegotiateFlag::NEGOTIATE_OEM_DOMAIN_SUPPLIED & $negotiate_flags)
            === NegotiateFlag::NEGOTIATE_OEM_DOMAIN_SUPPLIED) {
            $nt_domain_supplied = true;

            $nt_domain = $this->encoding_converter->convert(
                strtoupper($nt_domain),
                static::OEM_ENCODING
            );
        } else {
            // If the domain supplied flag isn't set, set the domain to an empty byte string
            $nt_domain = '';
        }

        if ((NegotiateFlag::NEGOTIATE_OEM_WORKSTATION_SUPPLIED & $negotiate_flags)
            === NegotiateFlag::NEGOTIATE_OEM_WORKSTATION_SUPPLIED) {
            $client_hostname_supplied = true;

            $client_hostname = $this->encoding_converter->convert(
                strtoupper($client_hostname),
                static::OEM_ENCODING
            );
        } else {
            // If the hostname supplied flag isn't set, set the domain to an empty byte string
            $client_hostname = '';
        }

        // Determine and calculate some values
        $payload_offset = static::calculatePayloadOffset($negotiate_flags);
        $domain_name_length = strlen($nt_domain);
        $hostname_length = strlen($client_hostname);

        /**
         * Determine the payload offsets of the domain name and hostname
         *
         * The specification says that these offsets should be set to valid
         * locations even if the negotation flags don't contain the flags
         * denoting their inclusion, however some NTLM servers seem to throw a
         * bit of a fit if the offsets are set to non-zero values when the flags
         * don't denote their inclusion.
         *
         * So yea, we're breaking spec here to appease some seemingly old or
         * improper implementations. cURL does the same here.
         *
         * @link https://msdn.microsoft.com/en-us/library/cc236641.aspx
         * @link https://github.com/bagder/curl/blob/curl-7_46_0/lib/curl_ntlm_msgs.c#L364-L370
         */
        $domain_name_offset = $nt_domain_supplied ? $payload_offset : 0;
        $hostname_offset = $client_hostname_supplied ? ($payload_offset + $domain_name_length) : 0;

        // Prepare a binary string to be returned
        $binary_string = '';

        $binary_string .= static::SIGNATURE; // 8-byte signature
        $binary_string .= pack('V', static::MESSAGE_TYPE); // 32-bit unsigned little-endian

        $binary_string .= pack('V', $negotiate_flags); // 32-bit unsigned little-endian

        // Domain name fields: length; length; offset of the domain value from the beginning of the message
        $binary_string .= pack('v', $domain_name_length); // 16-bit unsigned little-endian
        $binary_string .= pack('v', $domain_name_length); // 16-bit unsigned little-endian
        $binary_string .= pack('V', $domain_name_offset); // 32-bit unsigned little-endian, 1st value in the payload

        // Hostname fields: length; length; offset of the hostname value from the beginning of the message
        $binary_string .= pack('v', $hostname_length); // 16-bit unsigned little-endian
        $binary_string .= pack('v', $hostname_length); // 16-bit unsigned little-endian
        $binary_string .= pack('V', $hostname_offset); // 32-bit unsigned little-endian, 2nd value

        // NOTE: Omitting the version data here. It's unnecessary.

        // Add our payload data
        $binary_string .= $nt_domain;
        $binary_string .= $client_hostname;

        return $binary_string;
    }
{@inheritDoc}