public override long Parse(byte[] data, uint offset, uint ends)
{
try
{
long needed = 2;
var length = (ends - offset);
if (length < needed)
{
//Console.WriteLine("stage 1 " + needed);
return(length - needed);
}
uint oOffset = offset;
FIN = ((data[offset] & 0x80) == 0x80);
RSV1 = ((data[offset] & 0x40) == 0x40);
RSV2 = ((data[offset] & 0x20) == 0x20);
RSV3 = ((data[offset] & 0x10) == 0x10);
Opcode = (WSOpcode)(data[offset++] & 0xF);
Mask = ((data[offset] & 0x80) == 0x80);
PayloadLength = (long)(data[offset++] & 0x7F);
if (Mask)
{
needed += 4;
}
if (PayloadLength == 126)
{
needed += 2;
if (length < needed)
{
//Console.WriteLine("stage 2 " + needed);
return(length - needed);
}
PayloadLength = data.GetUInt16(offset, Endian.Big);
offset += 2;
}
else if (PayloadLength == 127)
{
needed += 8;
if (length < needed)
{
//Console.WriteLine("stage 3 " + needed);
return(length - needed);
}
PayloadLength = data.GetInt64(offset, Endian.Big);
offset += 8;
}
/*
* if (Mask)
* {
* MaskKey = new byte[4];
* MaskKey[0] = data[offset++];
* MaskKey[1] = data[offset++];
* MaskKey[2] = data[offset++];
* MaskKey[3] = data[offset++];
*
* //MaskKey = DC.GetUInt32(data, offset);
* //offset += 4;
* }
*/
needed += PayloadLength;
if (length < needed)
{
//Console.WriteLine("stage 4");
return(length - needed);
}
else
{
if (Mask)
{
MaskKey = new byte[4];
MaskKey[0] = data[offset++];
MaskKey[1] = data[offset++];
MaskKey[2] = data[offset++];
MaskKey[3] = data[offset++];
Message = DC.Clip(data, offset, (uint)PayloadLength);
//var aMask = BitConverter.GetBytes(MaskKey);
for (int i = 0; i < Message.Length; i++)
{
Message[i] = (byte)(Message[i] ^ MaskKey[i % 4]);
}
}
else
{
Message = DC.Clip(data, offset, (uint)PayloadLength);
}
return((offset - oOffset) + (int)PayloadLength);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
Console.WriteLine(offset + "::" + DC.ToHex(data));
throw ex;
}
}