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	my $client = ref ($this) eq "Arc::Connection::Client";
	my $netsock = $this->{_cmdclientsock};
	
#	$this->_Debug("ReadWriteBinary (C:",$client,") locin: ",$locin->fileno,", locout:",$locout->fileno,", net: ",$netsock->fileno);
	my $sel = new IO::Select($netsock,$locin);
	my $lwsel = new IO::Select($locout);
	my $nwsel = new IO::Select($netsock);

	my $buf;
	my $stop = 0;
	while (my @rs = $sel->can_read) {
		foreach my $r (@rs) {
			# Something is readable.
			my $ret = $r->sysread($buf,4096);
			# If no data received, this read socket is closed
			# We don't want to listen to it anymore
			unless ($ret) {
				$sel->remove($r);
				# If there is nothing to read anymore
				# we will never write to the other socket again.
				if ($r->fileno == $locin->fileno) {
					$stop = 1 unless $client;
					shutdown($netsock,1); # Close write connection
				} elsif ($r->fileno == $netsock->fileno) {
					# on client-side the netsock is closed only
					# if the command on server side has ended.
					# so game over
					$stop = 1 if $client;
					close($locout) unless $stop; # Local pipe is not needed anymore
				}
				
				last if $stop;
			} else {
				# select the appropriate write-"select"
				my $tsel = $r->fileno == $locin->fileno ? $nwsel : $lwsel;
				# encryption, decode or encode
				$buf = $r->fileno == $locin->fileno ? 
						$this->{_sasl}->encode($buf) : 
						$this->{_sasl}->decode($buf); 

				# sometimes SASL replies NULL if something is missing	
				# this is normal behaviour, the next buf will complete it 
				next unless $buf; 
			
				# if nothing is writeable, gameover
				last unless (my @ws = $tsel->can_write);
				last unless ($ws[0]->syswrite($buf));
			}
		}
		last if $stop;
	}

#	$this->_Debug("RW Binary ended.");
	return 1;
}

## send a line. (protocol)
## This function sends a command line to the ARCv2 socket.
##in> ... (line)
##out> true if writing has succeeded, otherwise false.
##eg> $this->_SendLine($cmd,"test"); 
sub _SendLine
{
	my $this = shift;
	return unless @_;
	my $line = join("",@_);
	$line =~ s/\r//g;
	$line =~ s/\n/ /g;
	return $this->_SetError("SendLine only available when connection and select is set.") unless $this->{_connected};

	if ($this->{_select}->can_write($this->{timeout})) { 
		$this->_Debug(substr ($line,0,30),"..");
		$line .= "\015\012";
		
# encrypt if necessary
		$line = $this->{_sasl}->encode($line)
			if $this->{_authenticated} == 1 and $this->{protocol} == 1;

		return $this->{_connection}->syswrite($line,4096) > 0;
	} else {
		$this->{_connected} = 0;
		$this->{_connection}->close;
		return $this->_SetError("Sending timed out.");
	}
}

## send a command. (protocol)  
## Send a command to the ARCv2 socket.
##in> $cmd, $parameter
##out> true if successful, otherwise false
##eg> $this->_SendCommand("CMDPASV",$consock->sockhost.':'.$consock->sockport);
sub _SendCommand
{
	my $this = shift;
	my ($cmd,$msg) = @_;
	my $ret = 1;

	$ret = $this->_SetError("Sending command $cmd failed.") unless $this->_SendLine($cmd,defined $msg ? " ".$msg : "");
	return $ret;
}

## receive a line (command). (protocol)
## This function receives data from the ARCv2 connection and
## fills the internal C<__linequeue> and C<__partial>. It returns 
## a line from the internal buffer if there is any. It also handles
## timeouts and "connection closed by foreign host"'s.
##out> true (and the line) if everything worked fine, otherwise false (undef)
##eg> if (my $line = $this->_RecvLine()) { ... }
sub _RecvLine
{
	my $this = shift;

	return shift @{$this->{__linequeue}} if scalar @{$this->{__linequeue}};

	# no connection is set not connected
	return $this->_SetError("RecvCommand only Available when connection and select is set.") unless $this->{_connected};

	my $partial = defined($this->{__partial}) ? $this->{__partial} : "";

	my $buf = "";
	until (scalar @{$this->{__linequeue}}) {