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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
namespace LumiSoft.Net.SIP.Message
{
/// <summary>
/// Implements SIP "accept-range" value. Defined in RFC 3261.
/// </summary>
/// <remarks>
/// <code>
/// RFC 3261 Syntax:
/// accept-range = media-range [ accept-params ]
/// media-range = ("*//*" / (m-type SLASH "*") / (m-type SLASH m-subtype)) *(SEMI m-parameter)
/// accept-params = SEMI "q" EQUAL qvalue *(SEMI generic-param)
/// </code>
/// </remarks>
public class SIP_t_AcceptRange : SIP_t_Value
{
private string m_MediaType = "";
private SIP_ParameterCollection m_pMediaParameters = null;
private SIP_ParameterCollection m_pParameters = null;
/// <summary>
/// Default constructor.
/// </summary>
public SIP_t_AcceptRange()
{
m_pMediaParameters = new SIP_ParameterCollection();
m_pParameters = new SIP_ParameterCollection();
}
#region method Parse
/// <summary>
/// Parses "accept-range" from specified value.
/// </summary>
/// <param name="value">SIP "accept-range" 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 "accept-range" 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)
{
/*
accept-range = media-range [ accept-params ]
media-range = ("*//*" / (m-type SLASH "*") / (m-type SLASH m-subtype)) *(SEMI m-parameter)
accept-params = SEMI "q" EQUAL qvalue *(SEMI generic-param)
*/
if(reader == null){
throw new ArgumentNullException("reader");
}
// Parse m-type
string word = reader.ReadWord();
if(word == null){
throw new SIP_ParseException("Invalid 'accept-range' value, m-type is missing !");
}
this.MediaType = word;
// Parse media and accept parameters !!! thats confusing part, RFC invalid.
bool media_accept = true;
while(reader.Available > 0){
reader.ReadToFirstChar();
// We have 'next' value, so we are done here.
if(reader.SourceString.StartsWith(",")){
break;
}
// We have parameter
else if(reader.SourceString.StartsWith(";")){
reader.ReadSpecifiedLength(1);
string paramString = reader.QuotedReadToDelimiter(new char[]{';',','},false);
if(paramString != ""){
string[] name_value = paramString.Split(new char[]{'='},2);
string name = name_value[0].Trim();
string value = "";
if(name_value.Length == 2){
value = name_value[1];
}
// If q, then accept parameters begin
if(name.ToLower() == "q"){
media_accept = false;
}
if(media_accept){
this.MediaParameters.Add(name,value);
}
else{
this.Parameters.Add(name,value);
}
}
}
// Unknown data
else{
throw new SIP_ParseException("SIP_t_AcceptRange unexpected prarameter value !");
}
}
}
#endregion
#region method ToStringValue
/// <summary>
/// Converts this to valid "accept-range" value.
/// </summary>
/// <returns>Returns "accept-range" value.</returns>
public override string ToStringValue()
{
/*
Accept = "Accept" HCOLON [ accept-range *(COMMA accept-range) ]
accept-range = media-range [ accept-params ]
media-range = ("*//*" / (m-type SLASH "*") / (m-type SLASH m-subtype)) *(SEMI m-parameter)
accept-params = SEMI "q" EQUAL qvalue *(SEMI generic-param)
*/
StringBuilder retVal = new StringBuilder();
retVal.Append(m_MediaType);
foreach(SIP_Parameter parameter in m_pMediaParameters){
if(parameter.Value != null){
retVal.Append(";" + parameter.Name + "=" + parameter.Value);
}
else{
retVal.Append(";" + parameter.Name);
}
}
foreach(SIP_Parameter parameter in m_pParameters){
if(parameter.Value != null){
retVal.Append(";" + parameter.Name + "=" + parameter.Value);
}
else{
retVal.Append(";" + parameter.Name);
}
}
return retVal.ToString();
}
#endregion
#region Properties Implementation
/// <summary>
/// Gets or sets media type. Value *(STAR) means all values. Syntax: mediaType / mediaSubType.
/// Examples: */*,video/*,text/html.
/// </summary>
public string MediaType
{
get{ return m_MediaType; }
set{
if(string.IsNullOrEmpty(value)){
throw new ArgumentException("Property MediaType value can't be null or empty !");
}
if(value.IndexOf('/') == -1){
throw new ArgumentException("Invalid roperty MediaType value, syntax: mediaType / mediaSubType !");
}
m_MediaType = value;
}
}
/// <summary>
/// Gets media parameters collection.
/// </summary>
/// <returns></returns>
public SIP_ParameterCollection MediaParameters
{
get{ return m_pMediaParameters; }
}
/// <summary>
/// Gets accept value parameters.
/// </summary>
public SIP_ParameterCollection Parameters
{
get{ return m_pParameters; }
}
/// <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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