public static STUNv2Header ParseSTUNHeader(byte[] buffer)
{
if ((buffer[0] & STUN_INITIAL_BYTE_MASK) != 0)
{
throw new ApplicationException("The STUNv2 header did not begin with 0x00.");
}
if (buffer != null && buffer.Length > 0 && buffer.Length >= STUN_HEADER_LENGTH)
{
STUNv2Header stunHeader = new STUNv2Header();
UInt16 stunTypeValue = BitConverter.ToUInt16(buffer, 0);
UInt16 stunMessageLength = BitConverter.ToUInt16(buffer, 2);
if (BitConverter.IsLittleEndian)
{
stunTypeValue = Utility.ReverseEndian(stunTypeValue);
stunMessageLength = Utility.ReverseEndian(stunMessageLength);
}
stunHeader.MessageType = STUNv2MessageTypes.GetSTUNMessageTypeForId(stunTypeValue);
stunHeader.MessageLength = stunMessageLength;
Buffer.BlockCopy(buffer, 8, stunHeader.TransactionId, 0, TRANSACTION_ID_LENGTH);
return(stunHeader);
}
return(null);
}
public static STUNv2Message ParseSTUNMessage(byte[] buffer, int bufferLength)
{
if (buffer != null && buffer.Length > 0 && buffer.Length >= bufferLength)
{
STUNv2Message stunMessage = new STUNv2Message();
stunMessage.Header = STUNv2Header.ParseSTUNHeader(buffer);
if (stunMessage.Header.MessageLength > 0)
{
stunMessage.Attributes = STUNv2Attribute.ParseMessageAttributes(buffer, STUNv2Header.STUN_HEADER_LENGTH, bufferLength);
}
return(stunMessage);
}
return(null);
}
public STUNv2Message(STUNv2MessageTypesEnum stunMessageType)
{
Header = new STUNv2Header(stunMessageType);
}