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);
}