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SIP Stack with SIP Proxy - (VOIP)

, 11 Jun 2007 CPOL 690.3K 21K 156
C# implementation of SIP
SIP_Proxy_demo.zip
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
Settings.settings
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
Stack.zip
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;
using System.Text;

namespace LumiSoft.Net.SIP.Message
{
    /// <summary>
    /// Implements "encoding" value. Defined in RFC 3261.
    /// </summary>
    /// <remarks>
    /// <code>
    /// RFC 3261 Syntax:
    ///     encoding       = codings *(SEMI accept-param)
    ///     codings        = content-coding / "*"
    ///     content-coding = token
    ///     accept-param   = ("q" EQUAL qvalue) / generic-param
    /// </code>
    /// </remarks>
    public class SIP_t_Encoding : SIP_t_ValueWithParams
    {
        private string m_ContentEncoding = "";

        /// <summary>
        /// Default constructor.
        /// </summary>
        public SIP_t_Encoding()
        {
        }


        #region method Parse

        /// <summary>
        /// Parses "encoding" from specified value.
        /// </summary>
        /// <param name="value">Accept-Encoding value.</param>
        /// <exception cref="ArgumentNullException">Raised when <b>value</b> is null.</exception>
        /// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
        public void Parse(string value)
        {
            if(value == null){
                throw new ArgumentNullException("value");
            }

            Parse(new StringReader(value));
        }

        /// <summary>
        /// Parses "encoding" from specified reader.
        /// </summary>
        /// <param name="reader">Reader from where to parse.</param>
        /// <exception cref="ArgumentNullException">Raised when <b>reader</b> is null.</exception>
        /// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
        public override void Parse(StringReader reader)
        {
            /* 
                encoding       = codings *(SEMI accept-param)
                codings        = content-coding / "*"
                content-coding = token
            */

            if(reader == null){
                throw new ArgumentNullException("reader");
            }
            
            // Parse content-coding
            string word = reader.ReadWord();
            if(word == null){
                throw new SIP_ParseException("Invalid 'encoding' value is missing !");
            }
            m_ContentEncoding = word;

            // Parse parameters
            ParseParameters(reader);
        }

        #endregion

        #region method ToStringValue

        /// <summary>
        /// Converts this to valid "encoding" value.
        /// </summary>
        /// <returns>Returns "encoding" value.</returns>
        public override string ToStringValue()
        {
            /* 
                Accept-Encoding  =  "Accept-Encoding" HCOLON [ encoding *(COMMA encoding) ]
                encoding         =  codings *(SEMI accept-param)
                codings          =  content-coding / "*"
                content-coding   =  token
            */

            StringBuilder retVal = new StringBuilder();           
            retVal.Append(m_ContentEncoding);
            retVal.Append(ParametersToString());

            return retVal.ToString();
        }

        #endregion


        #region Properties Implementation

        /// <summary>
        /// Gets or sets content encoding. Value *(STAR) means all content encodings.
        /// </summary>
        public string ContentEncoding
        {
            get{ return m_ContentEncoding; }

            set{
                if(string.IsNullOrEmpty(value)){
                    throw new ArgumentException("Property ContentEncoding value can't be null or empty !");
                }
                if(!TextUtils.IsToken(value)){
                    throw new ArgumentException("Property ContentEncoding value may be 'token' only !");
                }

                m_ContentEncoding = value;
            }
        }

        /// <summary>
        /// Gets or sets qvalue parameter. Targets are processed from highest qvalue to lowest. 
        /// This value must be between 0.0 and 1.0. Value -1 means that value not specified.
        /// </summary>
        public double QValue
        {
            get{
                SIP_Parameter parameter = this.Parameters["qvalue"];
                if(parameter != null){
                    return Convert.ToDouble(parameter.Value);
                }
                else{
                    return -1;
                }
            }

            set{
                if(value < 0 || value > 1){
                    throw new ArgumentException("Property QValue value must be between 0.0 and 1.0 !");
                }

                if(value < 0){
                    this.Parameters.Remove("qvalue");
                }
                else{
                    this.Parameters.Set("qvalue",value.ToString());
                }
            }
        }

        #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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Article Copyright 2007 by Ivar Lumi
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