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Posted 20 Mar 2007

SIP Stack with SIP Proxy - (VOIP)

, 11 Jun 2007
C# implementation of SIP
SIP_Proxy_demo
SIP_Proxy_demo.suo
SIP_Proxy_demo
bin
Debug
LumiSoft.Net.dll
SIP_Proxy_demo.exe
SIP_Proxy_demo.vshost.exe
dep
LumiSoft.Net.dll
LumiSoft.Net.pdb
Properties
Resources
add.ico
app.ico
delete.ico
edit.ico
error.ico
info.ico
refresh.ico
rule.ico
server_running.ico
server_stopped.ico
viewmessages.ico
Net
docs
dns
dns_records.jpg
dns_records.vsd
Net
_junk
_Obsolete
AUTH
bin
Release
LumiSoft.Net.dll
Data
Dns
Client
FTP
Client
Server
HTTP
Server
ICMP
IMAP
Client
Server
IO
Log
LumiSoft.Net
Mime
vCard
Net.csproj.user
Net.suo
NNTP
Client
POP3
Client
Server
RTP
SDP
ServersCore
SIP
Client
Message
Proxy
Stack
SMTP
Client
Server
STUN
Client
Message
URI
using System;
using System.Collections.Generic;

namespace LumiSoft.Net.IMAP
{
	/// <summary>
	/// IMAP sequence-set. RFC 3501.
	/// <code>
	/// Examples:
	///		2        -> seq-number (2)
	///		2:4      -> seq-range  (from 2 - 4)
	///		2:*      -> seq-range  (from 2 to last)
	///		2,3,10:* -> sequence-set (seq-number,seq-number,seq-range)
	///		                       (2,3, 10 - last)
	///		
	///		NOTES:
	///			*) comma separates sequence parts
	///			*) * means maximum value.
	/// </code>
	/// </summary>
	public class IMAP_SequenceSet
    {
        #region class Range

        /// <summary>
        /// Implements range.
        /// </summary>
        private class Range
        {
            private long m_Start = 0;
            private long m_End   = 0;

            /// <summary>
            /// Default constructor.
            /// </summary>
            /// <param name="value">Range value.</param>
            public Range(long value)
            {
                m_Start = value;
                m_End   = value;
            }

            /// <summary>
            /// Default constructor.
            /// </summary>
            /// <param name="start">Range start.</param>
            /// <param name="end">Range end.</param>
            public Range(long start,long end)
            {
                m_Start = start;
                m_End   = end;
            }


            #region Properties Implementation

            /// <summary>
            /// Gets range start.
            /// </summary>
            public long Start
            {
                get{ return m_Start; }
            }

            /// <summary>
            /// Gets range end.
            /// </summary>
            public long End
            {
                get{ return m_End; }
            }

            #endregion
        }

        #endregion

        private List<Range> m_pSequenceParts = null;
        private string      m_SequenceString = "";

		/// <summary>
		/// Default constructor.
		/// </summary>
		public IMAP_SequenceSet()
		{
            m_pSequenceParts = new List<Range>();
		}


		#region method Parse

        /// <summary>
		/// Parses sequence-set from specified string. Throws exception if invalid sequnce-set value.
		/// </summary>
		/// <param name="sequenceSetString">Sequence-set string.</param>
		public void Parse(string sequenceSetString)
		{
            Parse(sequenceSetString,long.MaxValue);
        }

		/// <summary>
		/// Parses sequence-set from specified string. Throws exception if invalid sequnce-set value.
		/// </summary>
		/// <param name="sequenceSetString">Sequence-set string.</param>
		/// <param name="seqMaxValue">Maximum value. This if for replacement of * value.</param>
		public void Parse(string sequenceSetString,long seqMaxValue)
		{
			/* RFC 3501
				seq-number     = nz-number / "*"
								; message sequence number (COPY, FETCH, STORE
								; commands) or unique identifier (UID COPY,
								; UID FETCH, UID STORE commands).
								; * represents the largest number in use.  In
								; the case of message sequence numbers, it is
								; the number of messages in a non-empty mailbox.
								; In the case of unique identifiers, it is the
								; unique identifier of the last message in the
								; mailbox or, if the mailbox is empty, the
								; mailbox's current UIDNEXT value.
								; The server should respond with a tagged BAD
								; response to a command that uses a message
								; sequence number greater than the number of
								; messages in the selected mailbox.  This
								; includes "*" if the selected mailbox is empty.

				seq-range      = seq-number ":" seq-number
								; two seq-number values and all values between
								; these two regardless of order.
								; Example: 2:4 and 4:2 are equivalent and indicate
								; values 2, 3, and 4.
								; Example: a unique identifier sequence range of
								; 3291:* includes the UID of the last message in
								; the mailbox, even if that value is less than 3291.

				sequence-set    = (seq-number / seq-range) *("," sequence-set)
								; set of seq-number values, regardless of order.
								; Servers MAY coalesce overlaps and/or execute the
								; sequence in any order.
								; Example: a message sequence number set of
								; 2,4:7,9,12:* for a mailbox with 15 messages is
								; equivalent to 2,4,5,6,7,9,12,13,14,15
								; Example: a message sequence number set of *:4,5:7
								; for a mailbox with 10 messages is equivalent to
								; 10,9,8,7,6,5,4,5,6,7 and MAY be reordered and
								; overlap coalesced to be 4,5,6,7,8,9,10.
			*/

			//--- Validate sequence-set --------------------------------------------------------//
			string[] sequenceSets = sequenceSetString.Trim().Split(',');
			foreach(string sequenceSet in sequenceSets){
				// seq-range 
				if(sequenceSet.IndexOf(":") > -1){
					string[] rangeParts = sequenceSet.Split(':');
					if(rangeParts.Length == 2){
                        long start = Parse_Seq_Number(rangeParts[0],seqMaxValue);
                        long end   = Parse_Seq_Number(rangeParts[1],seqMaxValue);
                        if(start <= end){
                            m_pSequenceParts.Add(new Range(start,end));
                        }
                        else{
                            m_pSequenceParts.Add(new Range(end,start));
                        }                        			
					}
					else{
						throw new Exception("Invalid <seq-range> '" + sequenceSet + "' value !");
					}
				}
				// seq-number
				else{
					m_pSequenceParts.Add(new Range(Parse_Seq_Number(sequenceSet,seqMaxValue)));
				}
			}
			//-----------------------------------------------------------------------------------//

            m_SequenceString = sequenceSetString;

		}

		#endregion

		#region method Contains

		/// <summary>
		/// Gets if sequence set contains specified number.
		/// </summary>
		/// <param name="seqNumber">Number to check.</param>
		public bool Contains(long seqNumber)
		{
			foreach(Range range in m_pSequenceParts){
                if(seqNumber >= range.Start && seqNumber <= range.End){
                    return true;
                }
            }

			return false;
		}

		#endregion

		#region method ToSequenceSetString

		/// <summary>
		/// Converts IMAP_SequenceSet to IMAP sequence-set string.
		/// </summary>
		/// <returns></returns>
		public string ToSequenceSetString()
		{
			return m_SequenceString;
		}

		#endregion


		#region method Parse_Seq_Number

		/// <summary>
		/// Parses seq-number from specified value. Throws exception if invalid seq-number value.
		/// </summary>
		/// <param name="seqNumberValue">Integer number or *.</param>
		/// <param name="seqMaxValue">Maximum value. This if for replacement of * value.</param>
		private long Parse_Seq_Number(string seqNumberValue,long seqMaxValue)
		{
			seqNumberValue = seqNumberValue.Trim();

			// * max value
			if(seqNumberValue == "*"){
				// Replace it with max value
				return seqMaxValue;
			}
			// Number
			else{
				try{
					return Convert.ToInt64(seqNumberValue);
				}
				catch{
					throw new Exception("Invalid <seq-number> '" + seqNumberValue + "' value !");
				}
			}
		}

		#endregion

	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Ivar Lumi
Estonia Estonia
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