public void Encode(Session session, Object message, MemoryStream stream)
{
if (message is WebMessage)
{
WebMessage msg = (WebMessage)message;
EncodeMessage(session, msg);
Byte[] bytes = msg.RawContent;
if (bytes == null)
{
bytes = new byte[0];
}
bool fin = true;
bool rsv1 = false;
bool rsv2 = false;
bool rsv3 = false;
byte opcode = 8; // if undefined then close it
bool maskcode = msg.MaskFlag > 0;
if (msg.IsString())
{
opcode = 0x01;
}
else if (msg.IsBinary())
{
opcode = 0x02;
}
else if (msg.IsPingFrame())
{
opcode = 0x09;
}
else if (msg.IsPongFrame())
{
opcode = 0x0A;
}
else if (msg.IsCloseFrame())
{
opcode = 0x08;
}
byte payloadlength = 0;
byte[] mask = maskcode ? new byte[4] {
0, 0, 0, 0
} : new byte[0];
byte[] extend = new byte[0];
int length = msg.ContentSize;
if (length < 126)
{
extend = new byte[0];
payloadlength = (byte)(length & 0xff);
}
else if (length < 65536)
{
extend = new byte[2];
payloadlength = 126;
extend[0] = (byte)(length / 256);
extend[1] = (byte)(length % 256);
}
else
{
extend = new byte[8];
payloadlength = 127;
int left = length;
int unit = 256;
for (int i = 7; i > 1; i--)
{
extend[i] = (byte)(left % unit);
left = left / unit;
if (left == 0)
{
break;
}
}
}
byte[] headerbuffer = new byte[2] {
0, 0
};
if (fin)
{
headerbuffer[0] |= 0x80;
}
if (rsv1)
{
headerbuffer[0] |= 0x40;
}
if (rsv2)
{
headerbuffer[0] |= 0x20;
}
if (rsv3)
{
headerbuffer[0] |= 0x10;
}
headerbuffer[0] |= opcode;
if (maskcode)
{
headerbuffer[1] |= 0x80;
}
headerbuffer[1] |= payloadlength;
stream.Write(headerbuffer, 0, headerbuffer.Length);
if (extend.Length > 0)
{
stream.Write(extend, 0, extend.Length);
}
if (mask.Length > 0)
{
stream.Write(mask, 0, mask.Length);
}
if (mask.Length > 0)
{
int masklen = mask.Length;
for (int i = 0; i < bytes.Length; i++)
{
bytes[i] = (byte)(bytes[i] ^ mask[i % masklen]);
}
}
stream.Write(bytes, 0, length);
}
else if (message is byte[])
{
Encode(session, new WebMessage(message as byte[]), stream);
}
else if (message is string)
{
String msg = (String)message;
Encoding encode = Encoding.UTF8;
Byte[] bytes = encode.GetBytes(msg);
stream.Write(bytes, 0, bytes.Length);
}
}
