/// <summary>
/// Read a command from the control connection.
/// </summary>
/// <returns>
/// True if a command was read.
/// </returns>
/// <param name='verb'>
/// Will receive the verb of the command.
/// </param>
/// <param name='args'>
/// Will receive the arguments of the command, or null.
/// </param>
private bool ReadCommand(out string verb, out string args)
{
verb = null;
args = null;
int endPos = -1;
// can there already be a command in the buffer?
if (cmdRcvBytes > 0)
{
Array.IndexOf(cmdRcvBuffer, (byte)'\n', 0, cmdRcvBytes);
}
try {
// read data until a newline is found
do
{
int freeBytes = cmdRcvBuffer.Length - cmdRcvBytes;
int bytes = controlSocket.Receive(cmdRcvBuffer, cmdRcvBytes, freeBytes, SocketFlags.None);
if (bytes <= 0)
{
break;
}
cmdRcvBytes += bytes;
// search \r\n
endPos = Array.IndexOf(cmdRcvBuffer, (byte)'\r', 0, cmdRcvBytes);
if (endPos != -1 && (cmdRcvBytes <= endPos + 1 || cmdRcvBuffer[endPos + 1] != (byte)'\n'))
{
endPos = -1;
}
} while (endPos == -1 && cmdRcvBytes < cmdRcvBuffer.Length);
} catch (SocketException) {
// in case the socket is closed or has some other error while reading
return(false);
}
if (endPos == -1)
{
return(false);
}
string command = DecodeString(cmdRcvBuffer, endPos);
// remove the command from the buffer
cmdRcvBytes -= (endPos + 2);
Array.Copy(cmdRcvBuffer, endPos + 2, cmdRcvBuffer, 0, cmdRcvBytes);
// CF is missing a limited String.Split
string[] tokens = command.Split(' ');
verb = tokens[0].ToUpper(); // commands are case insensitive
args = (tokens.Length > 1 ? String.Join(" ", tokens, 1, tokens.Length - 1) : null);
if (logHandler != null)
{
logHandler.ReceivedCommand(verb, args);
}
return(true);
}
