Ejemplo n.º 1
0
    public static StunMessage Parse(byte[] bytes)
    {
      var bits = new Bits(bytes);

      if (bits.Pop() != false || bits.Pop() != false)
      {
        throw new Exception("First two bits must be zeroes.");
      }

      var type = StunMessageType.Parse(bits.PopBits(14));

      var length = BitConverter.ToUInt16(bits.PopLittleEndianBytes(2), 0);

      var magicCookie = BitConverter.ToUInt32(bits.PopLittleEndianBytes(4), 0);
      if (magicCookie != MagicCookie)
      {
        throw new ArgumentException($"The parse magic cookie {magicCookie} doesn't match {MagicCookie}.", nameof(MagicCookie));
      }

      var attributes = new List<StunMessageAttribute>();
      for (var index = 0; index < length; index++)
      {
        attributes.Add(StunMessageAttribute.Parse(bits.PopBits(12 * 8)));
      }

      var id = StunMessageId.Parse(bits.PopLittleEndianBytes(12));

      return new StunMessage(type, attributes, id);
    }