private static string print(WsFrame frame)
{
/* Opcode */
var opcode = frame.Opcode.ToString();
/* Payload Len */
var payloadLen = frame.PayloadLen;
/* Extended Payload Len */
var ext = frame.ExtPayloadLen;
var size = ext.Length;
var extLen = size == 2
? ext.ToUInt16(ByteOrder.BIG).ToString()
: size == 8
? ext.ToUInt64(ByteOrder.BIG).ToString()
: String.Empty;
/* Masking Key */
var masked = frame.IsMasked;
var key = masked
? BitConverter.ToString(frame.MaskingKey)
: String.Empty;
/* Payload Data */
var data = payloadLen == 0
? String.Empty
: size > 0
? String.Format("A {0} data with {1} bytes.", opcode.ToLower(), extLen)
: masked || frame.IsFragmented || frame.IsBinary || frame.IsClose
? BitConverter.ToString(frame.PayloadData.ToByteArray())
: Encoding.UTF8.GetString(frame.PayloadData.ApplicationData);
var format =
@" FIN: {0}
RSV1: {1}
RSV2: {2}
RSV3: {3}
Opcode: {4}
MASK: {5}
Payload Len: {6}
Extended Payload Len: {7}
Masking Key: {8}
Payload Data: {9}";
return(String.Format(
format,
frame.Fin,
frame.Rsv1,
frame.Rsv2,
frame.Rsv3,
opcode,
frame.Mask,
payloadLen,
extLen,
key,
data));
}
private static WsFrame parse(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 len
var payloadLen = (byte)(header [1] & 0x7f);
// Check if correct frame.
var incorrect = isControl(opcode) && fin == Fin.MORE
? "A control frame is fragmented."
: !isData(opcode) && rsv1 == Rsv.ON
? "A non data frame is compressed."
: null;
if (incorrect != null)
{
throw new WebSocketException(CloseStatusCode.INCORRECT_DATA, incorrect);
}
// Check if consistent frame.
if (isControl(opcode) && payloadLen > 125)
{
throw new WebSocketException(
CloseStatusCode.INCONSISTENT_DATA,
"The payload data length of a control frame is greater than 125 bytes.");
}
var frame = new WsFrame {
Fin = fin,
Rsv1 = rsv1,
Rsv2 = rsv2,
Rsv3 = rsv3,
Opcode = opcode,
Mask = mask,
PayloadLen = payloadLen
};
/* Extended Payload Length */
var extLen = payloadLen < 126
? 0
: payloadLen == 126
? 2
: 8;
var extPayloadLen = extLen > 0
? stream.ReadBytes(extLen)
: new byte [] {};
if (extLen > 0 && extPayloadLen.Length != extLen)
{
throw new WebSocketException(
"The 'Extended Payload Length' of a frame cannot be read from the data source.");
}
frame.ExtPayloadLen = extPayloadLen;
/* Masking Key */
var masked = mask == Mask.MASK;
var maskingKey = masked
? stream.ReadBytes(4)
: new byte [] {};
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 dataLen = payloadLen < 126
? payloadLen
: payloadLen == 126
? extPayloadLen.ToUInt16(ByteOrder.BIG)
: extPayloadLen.ToUInt64(ByteOrder.BIG);
byte [] data = null;
if (dataLen > 0)
{
// Check if allowable payload data length.
if (payloadLen > 126 && dataLen > PayloadData.MaxLength)
{
throw new WebSocketException(
CloseStatusCode.TOO_BIG, "The 'Payload Data' length is greater than the allowable length.");
}
data = payloadLen > 126
? stream.ReadBytes((long)dataLen, 1024)
: stream.ReadBytes((int)dataLen);
if (data.LongLength != (long)dataLen)
{
throw new WebSocketException(
"The 'Payload Data' of a frame cannot be read from the data source.");
}
}
else
{
data = new byte [] {};
}
var payload = new PayloadData(data, masked);
if (masked && unmask)
{
payload.Mask(maskingKey);
frame.Mask = Mask.UNMASK;
frame.MaskingKey = new byte [] {};
}
frame.PayloadData = payload;
return(frame);
}
private static string dump(WsFrame frame)
{
var len = frame.Length;
var count = (long)(len / 4);
var rem = (int)(len % 4);
int countDigit;
string countFmt;
if (count < 10000)
{
countDigit = 4;
countFmt = "{0,4}";
}
else if (count < 0x010000)
{
countDigit = 4;
countFmt = "{0,4:X}";
}
else if (count < 0x0100000000)
{
countDigit = 8;
countFmt = "{0,8:X}";
}
else
{
countDigit = 16;
countFmt = "{0,16:X}";
}
var spFmt = String.Format("{{0,{0}}}", countDigit);
var headerFmt = String.Format(
@"{0} 01234567 89ABCDEF 01234567 89ABCDEF
{0}+--------+--------+--------+--------+\n", spFmt);
var footerFmt = String.Format("{0}+--------+--------+--------+--------+", spFmt);
var buffer = new StringBuilder(64);
Func <Action <string, string, string, string> > linePrinter = () =>
{
long lineCount = 0;
var lineFmt = String.Format("{0}|{{1,8}} {{2,8}} {{3,8}} {{4,8}}|\n", countFmt);
return((arg1, arg2, arg3, arg4) =>
buffer.AppendFormat(lineFmt, ++lineCount, arg1, arg2, arg3, arg4));
};
var printLine = linePrinter();
buffer.AppendFormat(headerFmt, String.Empty);
var frameAsBytes = frame.ToByteArray();
int i, j;
for (i = 0; i <= count; i++)
{
j = i * 4;
if (i < count)
{
printLine(
Convert.ToString(frameAsBytes [j], 2).PadLeft(8, '0'),
Convert.ToString(frameAsBytes [j + 1], 2).PadLeft(8, '0'),
Convert.ToString(frameAsBytes [j + 2], 2).PadLeft(8, '0'),
Convert.ToString(frameAsBytes [j + 3], 2).PadLeft(8, '0'));
}
else if (rem > 0)
{
printLine(
Convert.ToString(frameAsBytes [j], 2).PadLeft(8, '0'),
rem >= 2 ? Convert.ToString(frameAsBytes [j + 1], 2).PadLeft(8, '0') : String.Empty,
rem == 3 ? Convert.ToString(frameAsBytes [j + 2], 2).PadLeft(8, '0') : String.Empty,
String.Empty);
}
}
buffer.AppendFormat(footerFmt, String.Empty);
return(buffer.ToString());
}
public bool WriteFrame(WsFrame frame)
{
return(Write(frame.ToByteArray()));
}
public void ReadFrameAsync(Action <WsFrame> completed, Action <Exception> error)
{
WsFrame.ParseAsync(_innerStream, true, completed, error);
}
public WsFrame ReadFrame()
{
return(WsFrame.Parse(_innerStream, true));
}