private static string dump(WebSocketFrame frame)
{
var len = frame.Length;
var cnt = (long)(len / 4);
var rem = (int)(len % 4);
int cntDigit;
string cntFmt;
if (cnt < 10000)
{
cntDigit = 4;
cntFmt = "{0,4}";
}
else if (cnt < 0x010000)
{
cntDigit = 4;
cntFmt = "{0,4:X}";
}
else if (cnt < 0x0100000000)
{
cntDigit = 8;
cntFmt = "{0,8:X}";
}
else
{
cntDigit = 16;
cntFmt = "{0,16:X}";
}
var spFmt = String.Format("{{0,{0}}}", cntDigit);
var headerFmt = String.Format(@"
{0} 01234567 89ABCDEF 01234567 89ABCDEF
{0}+--------+--------+--------+--------+\n", spFmt);
var lineFmt = String.Format("{0}|{{1,8}} {{2,8}} {{3,8}} {{4,8}}|\n", cntFmt);
var footerFmt = String.Format("{0}+--------+--------+--------+--------+", spFmt);
var output = new StringBuilder(64);
Func <Action <string, string, string, string> > linePrinter = () => {
long lineCnt = 0;
return((arg1, arg2, arg3, arg4) =>
output.AppendFormat(lineFmt, ++lineCnt, arg1, arg2, arg3, arg4));
};
var printLine = linePrinter();
output.AppendFormat(headerFmt, String.Empty);
var bytes = frame.ToArray();
for (long i = 0; i <= cnt; i++)
{
var j = i * 4;
if (i < cnt)
{
printLine(
Convert.ToString(bytes[j], 2).PadLeft(8, '0'),
Convert.ToString(bytes[j + 1], 2).PadLeft(8, '0'),
Convert.ToString(bytes[j + 2], 2).PadLeft(8, '0'),
Convert.ToString(bytes[j + 3], 2).PadLeft(8, '0'));
continue;
}
if (rem > 0)
{
printLine(
Convert.ToString(bytes[j], 2).PadLeft(8, '0'),
rem >= 2 ? Convert.ToString(bytes[j + 1], 2).PadLeft(8, '0') : String.Empty,
rem == 3 ? Convert.ToString(bytes[j + 2], 2).PadLeft(8, '0') : String.Empty,
String.Empty);
}
}
output.AppendFormat(footerFmt, String.Empty);
return(output.ToString());
}
internal MessageEventArgs(WebSocketFrame frame)
{
_opcode = frame.Opcode;
_rawData = frame.PayloadData.ApplicationData;
}
private static WebSocketFrame processHeader(byte[] header)
{
if (header.Length != 2)
{
var msg = "The header part of a frame could not be read.";
throw new WebSocketException(msg);
}
// 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 = (byte)(header[0] & 0x0f);
// MASK
var mask = (header[1] & 0x80) == 0x80 ? Mask.On : Mask.Off;
// Payload Length
var payloadLen = (byte)(header[1] & 0x7f);
if (!opcode.IsSupported())
{
var msg = "A frame has an unsupported opcode.";
throw new WebSocketException(CloseStatusCode.ProtocolError, msg);
}
if (!opcode.IsData() && rsv1 == Rsv.On)
{
var msg = "A non data frame is compressed.";
throw new WebSocketException(CloseStatusCode.ProtocolError, msg);
}
if (opcode.IsControl())
{
if (fin == Fin.More)
{
var msg = "A control frame is fragmented.";
throw new WebSocketException(CloseStatusCode.ProtocolError, msg);
}
if (payloadLen > 125)
{
var msg = "A control frame has too long payload length.";
throw new WebSocketException(CloseStatusCode.ProtocolError, msg);
}
}
var frame = new WebSocketFrame();
frame._fin = fin;
frame._rsv1 = rsv1;
frame._rsv2 = rsv2;
frame._rsv3 = rsv3;
frame._opcode = (Opcode)opcode;
frame._mask = mask;
frame._payloadLength = payloadLen;
return(frame);
}