public WsFrame(Fin fin, Opcode opcode, Mask mask, PayloadData payload, bool compressed)
{
this.Fin = fin;
this.Rsv1 = ((!WsFrame.isData(opcode) || !compressed) ? Rsv.Off : Rsv.On);
this.Rsv2 = Rsv.Off;
this.Rsv3 = Rsv.Off;
this.Opcode = opcode;
this.Mask = mask;
ulong length = payload.Length;
byte b = (length >= 126UL) ? ((length >= 65536UL) ? 127 : 126) : ((byte)length);
this.PayloadLen = b;
this.ExtPayloadLen = ((b >= 126) ? ((b != 126) ? length.ToByteArrayInternally(ByteOrder.Big) : ((ushort)length).ToByteArrayInternally(ByteOrder.Big)) : new byte[0]);
bool flag = mask == Mask.Mask;
byte[] maskingKey = (!flag) ? new byte[0] : WsFrame.createMaskingKey();
this.MaskingKey = maskingKey;
if (flag)
{
payload.Mask(maskingKey);
}
this.PayloadData = payload;
}
private static WsFrame parse(byte[] header, Stream stream, bool unmask)
{
Fin fin = ((header[0] & 128) != 128) ? Fin.More : Fin.Final;
Rsv rsv = ((header[0] & 64) != 64) ? Rsv.Off : Rsv.On;
Rsv rsv2 = ((header[0] & 32) != 32) ? Rsv.Off : Rsv.On;
Rsv rsv3 = ((header[0] & 16) != 16) ? Rsv.Off : Rsv.On;
Opcode opcode = (Opcode)(header[0] & 15);
Mask mask = ((header[1] & 128) != 128) ? Mask.Unmask : Mask.Mask;
byte b = header[1] & 127;
string text = (!WsFrame.isControl(opcode) || fin != Fin.More) ? ((WsFrame.isData(opcode) || rsv != Rsv.On) ? null : "A non data frame is compressed.") : "A control frame is fragmented.";
if (text != null)
{
throw new WebSocketException(CloseStatusCode.IncorrectData, text);
}
if (WsFrame.isControl(opcode) && b > 125)
{
throw new WebSocketException(CloseStatusCode.InconsistentData, "The payload data length of a control frame is greater than 125 bytes.");
}
WsFrame wsFrame = new WsFrame
{
Fin = fin,
Rsv1 = rsv,
Rsv2 = rsv2,
Rsv3 = rsv3,
Opcode = opcode,
Mask = mask,
PayloadLen = b
};
int num = (b >= 126) ? ((b != 126) ? 8 : 2) : 0;
byte[] array = (num <= 0) ? new byte[0] : stream.ReadBytes(num);
if (num > 0 && array.Length != num)
{
throw new WebSocketException("The 'Extended Payload Length' of a frame cannot be read from the data source.");
}
wsFrame.ExtPayloadLen = array;
bool flag = mask == Mask.Mask;
byte[] array2 = (!flag) ? new byte[0] : stream.ReadBytes(4);
if (flag && array2.Length != 4)
{
throw new WebSocketException("The 'Masking Key' of a frame cannot be read from the data source.");
}
wsFrame.MaskingKey = array2;
ulong num2 = (b >= 126) ? ((b != 126) ? array.ToUInt64(ByteOrder.Big) : ((ulong)array.ToUInt16(ByteOrder.Big))) : ((ulong)b);
byte[] array3;
if (num2 > 0UL)
{
if (b > 126 && num2 > 9223372036854775807UL)
{
throw new WebSocketException(CloseStatusCode.TooBig, "The 'Payload Data' length is greater than the allowable length.");
}
array3 = ((b <= 126) ? stream.ReadBytes((int)num2) : stream.ReadBytes((long)num2, 1024));
if (array3.LongLength != (long)num2)
{
throw new WebSocketException("The 'Payload Data' of a frame cannot be read from the data source.");
}
}
else
{
array3 = new byte[0];
}
PayloadData payloadData = new PayloadData(array3, flag);
if (flag && unmask)
{
payloadData.Mask(array2);
wsFrame.Mask = Mask.Unmask;
wsFrame.MaskingKey = new byte[0];
}
wsFrame.PayloadData = payloadData;
return(wsFrame);
}
