private int CreateHeader(out int contentLength)
{
contentLength = 0;
if (_header is ContentHeader content)
{
if (_message is Stream)
{
throw new NotSupportedException();
}
if (_message is byte[] buf)
{
throw new NotSupportedException();
}
_bodyStream = _contentStream;
var pos = _bodyStream.Position;
if (_message is IDynamicPayload dp)
{
content.PacketFlag |= PacketFlag.MultiContent;
var obj = dp.Deconstruct();
content.ContentLength = new int[obj.Length];
byte[] ct = null;
for (var i = 0; i < obj.Length; i++)
{
var cur = _bodyStream.Position;
Serializer.Serialize(obj[i], _bodyStream, out ct);
content.ContentLength[i] = checked ((int)(_bodyStream.Position - cur));
}
content.ContentType = ct;
}
else
{
byte[] contentType = ContentHeader.EmptyContent;
if (!content.PacketFlag.HasFlag(PacketFlag.NoContent))
{
Serializer.Serialize(_message, _bodyStream, out contentType);
}
content.ContentType = contentType;
content.ContentLength = new int[1] {
checked ((int)(_bodyStream.Position - pos))
};
}
_bodyStream.Position = pos;
contentLength = checked ((int)(_bodyStream.Length - _bodyStream.Position));
if (contentLength == 0)
{
content.PacketFlag |= PacketFlag.NoContent;
}
if (content.ContentLength.Length > 1)
{
content.PacketFlag |= PacketFlag.MultiContent;
}
}
else if (_header is RawDataHeader raw)
{
_bodyStream = (Stream)_message;
if (raw.ContentLength <= 0)
{
raw.ContentLength = checked ((int)(_bodyStream.Length - _bodyStream.Position));
}
contentLength = raw.ContentLength;
_disposeBodyStream = raw.DisposeStreamAfterSend;
}
_headerStream.TryExtend(512);
_headerStream.Position = sizeof(short);
_headerStream.Write(Version);
_header.Serialize(_headerStream);
var len = (short)_headerStream.Position;
if (_headerStream.Position > ushort.MaxValue)
{
throw new InvalidDataException("Invalid header");
}
_headerStream.Position = 0;
_headerStream.Write(len);
return(len);
}