public static SessionDescription Load(TextReader reader, LoadOptions loadOptions)
{
SessionDescription sd = new SessionDescription(false);
Media media = null;
string line = reader.ReadLine();
while (line != null)
{
if ((line.Length == 0) && ((loadOptions & LoadOptions.IgnoreEmptyLines) != 0))
{
goto nextline;
}
if (line.Length < 3)
{
goto invalidline;
}
if (line[1] != '=')
{
goto invalidline;
}
string value = line.Substring(2);
string[] parts = null;
int sep = -1;
try
{
switch (line[0])
{
case 'v':
if (media != null)
{
goto invalidline;
}
int version = -1;
Grammar.ValidateDigits(value, false);
if (!int.TryParse(value, out version))
{
goto invalidline;
}
if ((loadOptions & LoadOptions.IgnoreUnsupportedVersion) == 0)
{
if (version != 0)
{
goto notsupported;
}
}
sd.Version = version;
break;
case 'o':
if (media != null)
{
goto invalidline;
}
sd.Origin = Origin.Parse(value);
break;
case 's':
if (media != null)
{
goto invalidline;
}
sd.Name = value;
break;
case 'i':
if (media == null)
{
sd.Information = value;
}
else
{
media.Information = value;
}
break;
case 'u':
if (media != null)
{
goto invalidline;
}
sd.Uri = new Uri(value);
break;
case 'e':
if (media != null)
{
goto invalidline;
}
sd.EMails.Add(value);
break;
case 'p':
if (media != null)
{
goto invalidline;
}
sd.PhoneNumbers.Add(value);
break;
case 'c':
if (media == null)
{
if (sd.HasConnection)
{
goto invalidline;
}
}
Connection conn = new Connection();
parts = value.Split(' ');
if (parts.Length != 3)
{
goto invalidline;
}
string networkType = parts[0];
string addressType = parts[1];
parts = parts[2].Split('/');
if (parts.Length > 3)
{
goto invalidline;
}
conn.SetAddress(networkType, addressType, parts[0]);
conn.Address = parts[0];
conn.AddressCount = 1;
if (parts.Length >= 2)
{
uint ttl = 0;
if (!uint.TryParse(parts[1], out ttl))
{
goto invalidline;
}
conn.Ttl = ttl;
if (parts.Length == 3)
{
uint addressCount = 0;
if (!uint.TryParse(parts[2], out addressCount))
{
goto invalidline;
}
conn.AddressCount = addressCount;
}
if (conn.AddressType == "IP6")
{
if (parts.Length == 3)
{
goto invalidline;
}
conn.AddressCount = conn.Ttl;
conn.Ttl = 0;
}
}
if (media != null)
{
media.Connections.Add(conn);
}
else
{
sd.Connection = conn;
}
break;
case 'b':
sep = value.IndexOf(':');
if (sep == -1)
{
goto invalidline;
}
string type = value.Substring(0, sep);
string bw = value.Substring(sep + 1);
Grammar.ValidateDigits(bw, false);
uint bwValue = 0;
if (!uint.TryParse(bw, out bwValue))
{
goto invalidline;
}
if (media != null)
{
media.Bandwidths.Add(new Bandwidth(type, bwValue));
}
else
{
sd.Bandwidths.Add(new Bandwidth(type, bwValue));
}
break;
case 'a':
sep = value.IndexOf(':');
string attrName;
string attrValue;
if (sep != -1)
{
attrName = value.Substring(0, sep);
attrValue = value.Substring(sep + 1);
}
else
{
attrName = value;
attrValue = null;
}
if (media != null)
{
media.Attributes.Add(attrName, attrValue);
}
else
{
sd.Attributes.Add(attrName, attrValue);
}
break;
case 't':
if (media != null)
{
goto invalidline;
}
parts = value.Split(' ');
if (parts.Length != 2)
{
goto invalidline;
}
Grammar.ValidateTime(parts[0]);
double startTime = 0;
if (!double.TryParse(parts[0], out startTime))
{
goto invalidline;
}
Grammar.ValidateTime(parts[1]);
double stopTime = 0;
if (!double.TryParse(parts[1], out stopTime))
{
goto invalidline;
}
DateTime startDateTime = Time.Zero;
DateTime stopDateTime = Time.Zero;
if (startTime != 0)
{
startDateTime = Time.Zero + TimeSpan.FromSeconds(startTime);
}
if (stopTime != 0)
{
stopDateTime = Time.Zero + TimeSpan.FromSeconds(stopTime);
}
sd.Times.Add(new Time(startDateTime, stopDateTime));
break;
case 'm':
parts = value.Split(' ');
if (parts.Length < 4)
{
goto invalidline;
}
string mediaType = parts[0];
string protocol = parts[2];
var formats = parts.Skip(3).ToList();
parts = parts[1].Split('/');
if (parts.Length > 2)
{
goto invalidline;
}
uint port = 0;
uint portCount = 1;
Grammar.ValidateDigits(parts[0], false);
if (!uint.TryParse(parts[0], out port))
{
goto invalidline;
}
if (parts.Length == 2)
{
Grammar.ValidateDigits(parts[1], true);
if (!uint.TryParse(parts[1], out portCount))
{
goto invalidline;
}
}
media = new Media(mediaType, port, portCount, protocol, formats);
sd.Medias.Add(media);
break;
case 'z':
case 'k':
case 'r':
if ((loadOptions & LoadOptions.IgnoreUnsupportedLines) == 0)
{
goto notsupported;
}
break;
default:
if ((loadOptions & LoadOptions.IgnoreUnknownLines) == 0)
{
goto invalidline;
}
break;
}
}
catch
{
goto invalidline;
}
nextline:
line = reader.ReadLine();
continue;
invalidline:
throw new SdpException(string.Format("Invalid Line {0}", line));
notsupported:
throw new SdpException(string.Format("Unsupported line {0}", line));
}
if (sd.Version == -1)
{
throw new SdpException("Version ('v=') is required");
}
if (!sd.HasOrigin)
{
throw new SdpException("Origin ('o=') is required");
}
if (sd.Name == null)
{
throw new SdpException("Name ('s=') is required");
}
if (!sd.HasTimes)
{
throw new SdpException("Time ('t=') is required");
}
return(sd);
}