public DataFragment(byte[] fragment)
{
_fragment = fragment;
_head = (FragmentHead)_fragment[0];
Opcode = (FragmentOpcode)(_fragment[0] & _opcodeMask);
Masked = (_fragment[1] & _maskFlagMask) != 0;
_hasMaskingKey = Masked;
CalculateLengthAndPositions();
}
public static DataFragment Create(byte[] payload, FragmentHead head, FragmentOpcode opcode, bool mask)
{
var payloadLength = payload.Length;
var lengthBytes = new List <byte>();
if (payloadLength < 126)
{
lengthBytes.Add((byte)payloadLength);
}
else if (payloadLength < ushort.MaxValue)
{
lengthBytes.Add(126);
var lbytes = BitConverter.GetBytes((ushort)payloadLength);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(lbytes);
}
lengthBytes.AddRange(lbytes);
}
else
{
lengthBytes.Add(127);
var lbytes = BitConverter.GetBytes((ulong)payloadLength);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(lbytes);
}
lengthBytes.AddRange(lbytes);
}
byte[] maskingKey = new byte[0];
if (mask)
{
var rnd = new Random();
maskingKey = new byte[4];
rnd.NextBytes(maskingKey);
ToggleMasking(payload, 0, maskingKey);
lengthBytes[0] = (byte)(lengthBytes[0] + _maskFlagMask);
}
var bytes = new List <byte>();
bytes.Add((byte)((byte)head + (byte)opcode));
bytes.AddRange(lengthBytes);
bytes.AddRange(maskingKey);
bytes.AddRange(payload);
return(new DataFragment(bytes.ToArray()));
}