/// <summary>
/// Runs the data through our presentation handlers
/// </summary>
/// <param name="data">The data to format</param>
/// <param name="connection">The connection object this data is going to be sent to</param>
/// <param name="sendAllData">Indicates if all data should be sent.</param>
/// <returns>A formatted string of data</returns>
internal static string FormatData(string data, Connection connection, bool sendAllData)
{
if (connection.Terminal.UseWordWrap && connection.Terminal.Width > 0)
{
data = WordWrapHandler.Parse(data, connection.Terminal.Width);
}
if (connection.Terminal.UseBuffer && !sendAllData)
{
connection.OutputBuffer.Clear();
string[] temp = BufferHandler.Parse(data);
string[] output;
bool appendOverflow = false;
if (temp.Length > connection.PagingRowLimit)
{
appendOverflow = true;
connection.OutputBuffer.Append(temp);
output = connection.OutputBuffer.GetRows(BufferDirection.Forward, connection.PagingRowLimit);
}
else
{
output = temp;
}
data = BufferHandler.Format(
output,
false,
appendOverflow,
connection.OutputBuffer.CurrentLocation,
connection.OutputBuffer.Length);
}
if (connection.Terminal.UseANSI)
{
data = AnsiHandler.Parse(data);
}
else
{
// TODO: Remove regex into separate parser.
var options = RegexOptions.None;
var regex = new Regex(@"<%?\w+[^>]*%>", options);
string input = data;
string replacement = string.Empty;
data = regex.Replace(input, replacement);
}
if (!connection.Terminal.UseMXP)
{
// TODO: Remove regex into separate parser.
var options = RegexOptions.None;
var regex = new Regex(@"</?\w+[^>]*>", options);
string input = data;
string replacement = string.Empty;
data = regex.Replace(input, replacement);
}
return data;
}
/// <summary>
/// Checks the data passed to it to see if the connection now has
/// a command ready.
/// </summary>
/// <param name="sender">The connection sending the data</param>
/// <param name="data">The data received</param>
public void OnDataReceived(Connection sender, Byte[] data)
{
//we can be sure that the data is text because the telnet server has dealt with any nasties
string input = Encoding.ASCII.GetString(data);
//Append the data to our text buffer.
sender.Buffer.Append(input);
//get the whole of our buffer
input = sender.Buffer.ToString();
input = StripDodgyTerminator(sender, input);
//if we have nothing left to process then bail out
if (input.Length == 0)
{
return;
}
SetLastTerminator(sender, input);
//replace any \r\n or \n\r or \n with just \r so that we can just deal with one line marker
input = input.Replace("\n", _newLineMarker);
input = input.Replace("\r\r", _newLineMarker);
//our new line will only be a \r as we removed all \n above.
if (input.Contains(_newLineMarker))
{
//we have received a newline char in our stream, this means that
//we need to raise a command. However we might receive multiple commands
//in the same stream as our network connection might be slow.
//we have a special case which is not captured by below.
//that of just a carriage return being entered in the client.
//we should pass that up as a valid command.
if (input == _newLineMarker)
{
RaiseInputReceived(new ConnectionArgs(sender), "");
}
//does our input "end" with \r if so then we have a series of full commands.
//if it doesnt then we have a partial command at the end which needs to wait for more data.
bool fullCommand = input.EndsWith(_newLineMarker);
//split on our \r
string[] commands = input.Split(new string[] { _newLineMarker }, StringSplitOptions.RemoveEmptyEntries);
string action = string.Empty;
for (int i = 0; i < commands.Length; i++)
{
action = commands[i].Trim();
//if its a full command.
if ((i < commands.Length - 1) || (i == commands.Length - 1 && fullCommand))
{
//fill the last input buffer
sender.LastInput = action;
//raise the input recevied event
RaiseInputReceived(new ConnectionArgs(sender), action);
}
}
//clear the buffer
sender.Buffer.Length = 0;
if (!fullCommand)
{
//if the last command wasnt a full command,
//we need to append that action back to the buffer
sender.Buffer.Append(action);
}
}
}
/// <summary>
/// Because of the variation in line terminators between clients we have to choose one
/// and strip out the others. This leaves a funny situation when we have determined that
/// a command has come in because of \r so we process it but the next string we receive
/// begins with \n because the client actually send command\r\n.
/// This function checks the last terminator we received and if the opposite one is
/// received at the start of the next set of data it removes it.
/// </summary>
/// <param name="sender">The connection we received the input on</param>
/// <param name="input">The input we are checking</param>
/// <returns></returns>
private static string StripDodgyTerminator(Connection sender, String input)
{
if ((sender.LastInputTerminator == "\r") && input.StartsWith("\n"))
{
input = input.Replace("\n", "");
}
else if ((sender.LastInputTerminator == "\n") && input.StartsWith("\r"))
{
input = input.Replace("\r", "");
}
return input;
}
/// <summary>
/// Sets the last input terminator to the termination char(s) we have
/// just received (if any)
/// </summary>
/// <param name="sender">The connection we received input on</param>
/// <param name="input">The input we are checking</param>
private static void SetLastTerminator(Connection sender, String input)
{
if (input.Contains("\r") & input.Contains("\n"))
{
sender.LastInputTerminator = "\r\n";
}
else if (input.Contains("\r"))
{
sender.LastInputTerminator = "\r";
}
else if (input.Contains("\n"))
{
sender.LastInputTerminator = "\n";
}
}
