internal static WebSocketFrame ReadFrame(Stream stream, bool unmask)
{
WebSocketFrame webSocketFrames = WebSocketFrame.readHeader(stream);
WebSocketFrame.readExtendedPayloadLength(stream, webSocketFrames);
WebSocketFrame.readMaskingKey(stream, webSocketFrames);
WebSocketFrame.readPayloadData(stream, webSocketFrames);
if (unmask)
{
webSocketFrames.Unmask();
}
return(webSocketFrames);
}
private static WebSocketFrame read(byte[] header, Stream stream, bool unmask)
{
/* Header */
// FIN
var fin = (header[0] & 0x80) == 0x80 ? Fin.Final : Fin.More;
// RSV1
var rsv1 = (header[0] & 0x40) == 0x40 ? Rsv.On : Rsv.Off;
// RSV2
var rsv2 = (header[0] & 0x20) == 0x20 ? Rsv.On : Rsv.Off;
// RSV3
var rsv3 = (header[0] & 0x10) == 0x10 ? Rsv.On : Rsv.Off;
// Opcode
var opcode = (Opcode)(header[0] & 0x0f);
// MASK
var mask = (header[1] & 0x80) == 0x80 ? Mask.Mask : Mask.Unmask;
// Payload Length
var payloadLen = (byte)(header[1] & 0x7f);
// Check if valid header
var err = isControl(opcode) && payloadLen > 125
? "A control frame has a payload data which is greater than the allowable max size."
: isControl(opcode) && fin == Fin.More
? "A control frame is fragmented."
: !isData(opcode) && rsv1 == Rsv.On
? "A non data frame is compressed."
: null;
if (err != null)
{
throw new WebSocketException(CloseStatusCode.ProtocolError, err);
}
var frame = new WebSocketFrame();
frame._fin = fin;
frame._rsv1 = rsv1;
frame._rsv2 = rsv2;
frame._rsv3 = rsv3;
frame._opcode = opcode;
frame._mask = mask;
frame._payloadLength = payloadLen;
/* Extended Payload Length */
var size = payloadLen < 126
? 0
: payloadLen == 126
? 2
: 8;
var extPayloadLen = size > 0 ? stream.ReadBytes(size) : new byte[0];
if (size > 0 && extPayloadLen.Length != size)
{
throw new WebSocketException(
"The 'Extended Payload Length' of a frame cannot be read from the data source.");
}
frame._extPayloadLength = extPayloadLen;
/* Masking Key */
var masked = mask == Mask.Mask;
var maskingKey = masked ? stream.ReadBytes(4) : new byte[0];
if (masked && maskingKey.Length != 4)
{
throw new WebSocketException(
"The 'Masking Key' of a frame cannot be read from the data source.");
}
frame._maskingKey = maskingKey;
/* Payload Data */
ulong len = payloadLen < 126
? payloadLen
: payloadLen == 126
? extPayloadLen.ToUInt16(ByteOrder.Big)
: extPayloadLen.ToUInt64(ByteOrder.Big);
byte[] data = null;
if (len > 0)
{
// Check if allowable max length.
if (payloadLen > 126 && len > PayloadData.MaxLength)
{
throw new WebSocketException(
CloseStatusCode.TooBig,
"The length of 'Payload Data' of a frame is greater than the allowable max length.");
}
data = payloadLen > 126
? stream.ReadBytes((long)len, 1024)
: stream.ReadBytes((int)len);
if (data.LongLength != (long)len)
{
throw new WebSocketException(
"The 'Payload Data' of a frame cannot be read from the data source.");
}
}
else
{
data = new byte[0];
}
frame._payloadData = new PayloadData(data, masked);
if (unmask && masked)
{
frame.Unmask();
}
return(frame);
}
private static WebSocketFrame read(byte[] header, Stream stream, bool unmask)
{
Fin fin = (((header[0] & 0x80) == 128) ? Fin.Final : Fin.More);
Rsv rsv = (((header[0] & 0x40) == 64) ? Rsv.On : Rsv.Off);
Rsv rsv2 = (((header[0] & 0x20) == 32) ? Rsv.On : Rsv.Off);
Rsv rsv3 = (((header[0] & 0x10) == 16) ? Rsv.On : Rsv.Off);
Opcode opcode = (Opcode)(header[0] & 0xFu);
Mask mask = (((header[1] & 0x80) == 128) ? Mask.Mask : Mask.Unmask);
byte b = (byte)(header[1] & 0x7Fu);
string text = ((isControl(opcode) && b > 125) ? "A control frame has a payload data which is greater than the allowable max size." : ((isControl(opcode) && fin == Fin.More) ? "A control frame is fragmented." : ((isData(opcode) || rsv != Rsv.On) ? null : "A non data frame is compressed.")));
if (text != null)
{
throw new WebSocketException(CloseStatusCode.ProtocolError, text);
}
WebSocketFrame webSocketFrame = new WebSocketFrame();
webSocketFrame._fin = fin;
webSocketFrame._rsv1 = rsv;
webSocketFrame._rsv2 = rsv2;
webSocketFrame._rsv3 = rsv3;
webSocketFrame._opcode = opcode;
webSocketFrame._mask = mask;
webSocketFrame._payloadLength = 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.");
}
webSocketFrame._extPayloadLength = 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.");
}
webSocketFrame._maskingKey = array2;
ulong num2 = ((b < 126) ? b : ((b != 126) ? array.ToUInt64(ByteOrder.Big) : array.ToUInt16(ByteOrder.Big)));
byte[] array3 = null;
if (num2 != 0)
{
if (b > 126 && num2 > long.MaxValue)
{
throw new WebSocketException(CloseStatusCode.TooBig, "The length of 'Payload Data' of a frame is greater than the allowable max 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];
}
webSocketFrame._payloadData = new PayloadData(array3, flag);
if (unmask && flag)
{
webSocketFrame.Unmask();
}
return(webSocketFrame);
}
