protected ConnectionCloseEventArgs GetConnectionCloseEventArgsFromPayload(byte[] payload)
{
if (payload.Length >= 2)
{
using (MemoryStream stream = new MemoryStream(payload))
{
ushort code = BinaryReaderWriter.ReadUShortExactly(stream, false);
try
{
WebSocketCloseCode closeCode = (WebSocketCloseCode)code;
if (payload.Length > 2)
{
string reason = Encoding.UTF8.GetString(payload, 2, payload.Length - 2);
return(new ConnectionCloseEventArgs(closeCode, reason));
}
else
{
return(new ConnectionCloseEventArgs(closeCode, null));
}
}
catch (InvalidCastException)
{
_logger.Warning(this.GetType(), "Close code {0} not recognised", code);
return(new ConnectionCloseEventArgs(WebSocketCloseCode.Normal, null));
}
}
}
return(new ConnectionCloseEventArgs(WebSocketCloseCode.Normal, null));
}
private static uint ReadLength(byte byte2, Stream stream)
{
byte payloadLenFlag = 0x7F;
uint len = (uint)(byte2 & payloadLenFlag);
// read a short length or a long length depending on the value of len
if (len == 126)
{
len = BinaryReaderWriter.ReadUShortExactly(stream, false);
}
else if (len == 127)
{
len = (uint)BinaryReaderWriter.ReadULongExactly(stream, false);
const uint maxLen = 2147483648; // 2GB
// protect ourselves against bad data
if (len > maxLen || len < 0)
{
throw new ArgumentOutOfRangeException(string.Format("Payload length out of range. Min 0 max 2GB. Actual {0:#,##0} bytes.", len));
}
}
return(len);
}