/// <summary>
/// Scans invalid CR or LF combination in stream. Returns true if contains invalid CR or LF combination.
/// </summary>
/// <param name="strm">Stream which to check.</param>
/// <returns>Returns true if contains invalid CR or LF combination.</returns>
public static bool ScanInvalid_CR_or_LF(Stream strm)
{
StreamHelper lineReader = new StreamHelper(strm, null);
byte[] line = lineReader.ReadLine();
while(line != null){
foreach(byte b in line){
// Contains CR or LF. It cannot conatian such sumbols, because CR must be paired with LF
// and we currently reading lines with CRLF combination.
if(b == 10 || b == 13){
return true;
}
}
line = lineReader.ReadLine();
}
return false;
}
/// <summary>
/// Does period handling.
/// </summary>
/// <param name="strm">Input stream.</param>
/// <param name="add_Remove">If true add periods, else removes periods.</param>
/// <param name="setStrmPosTo0">If true sets stream position to 0.</param>
/// <returns></returns>
public static MemoryStream DoPeriodHandling(Stream strm,bool add_Remove,bool setStrmPosTo0)
{
MemoryStream replyData = new MemoryStream();
byte[] crlf = new byte[]{(byte)'\r',(byte)'\n'};
if(setStrmPosTo0){
strm.Position = 0;
}
StreamHelper r = new StreamHelper(strm, null);
byte[] line = r.ReadLine();
// Loop through all lines
while(line != null){
if(line.Length > 0){
if(line[0] == (byte)'.'){
/* Add period Rfc 2821 4.5.2
- Before sending a line of mail text, the SMTP client checks the
first character of the line. If it is a period, one additional
period is inserted at the beginning of the line.
*/
if(add_Remove){
replyData.WriteByte((byte)'.');
replyData.Write(line,0,line.Length);
}
/* Remove period Rfc 2821 4.5.2
If the first character is a period , the first characteris deleted.
*/
else{
replyData.Write(line,1,line.Length-1);
}
break;
}
else{
replyData.Write(line,0,line.Length);
}
}
replyData.Write(crlf,0,crlf.Length);
// Read next line
line = r.ReadLine();
}
replyData.Position = 0;
return replyData;
}
/// <summary>
/// Connects to specified host.
/// </summary>
/// <param name="host">Host name.</param>
/// <param name="port">Port number.</param>
public void Connect(string host, int port, bool sslEnabled)
{
if (!m_Connected)
{
TcpClient client = new TcpClient(host, port);
if (sslEnabled)
{
socketStream = new SslStream(client.GetStream(), false, null, null);
(socketStream as SslStream).AuthenticateAsClient(host);
}
else
{
socketStream = client.GetStream();
}
streamHelper = new StreamHelper(socketStream, Encoding.ASCII);
m_Connected = true;
string reply = streamHelper.ReadToEnd();
if (reply.StartsWith("+OK"))
{
// Try to read APOP hash key, if supports APOP
if (reply.IndexOf("<") > -1 && reply.IndexOf(">") > -1)
{
m_ApopHashKey = reply.Substring(reply.LastIndexOf("<"), reply.LastIndexOf(">") - reply.LastIndexOf("<") + 1);
}
}
}
}
