/* https://tools.ietf.org/html/rfc7540#section-4.1
+-----------------------------------------------+
| Length (24) |
+---------------+---------------+---------------+
| Type (8) | Flags (8) |
+-+-------------+---------------+-------------------------------+
|R| Stream Identifier (31) |
+=+=============================================================+
| Frame Payload (0...) ...
+---------------------------------------------------------------+
*/
internal static void WriteHeader(Http2Frame frame, PipeWriter output)
{
var buffer = output.GetSpan(Http2FrameReader.HeaderLength);
Bitshifter.WriteUInt24BigEndian(buffer, (uint)frame.PayloadLength);
buffer = buffer.Slice(3);
buffer[0] = (byte)frame.Type;
buffer[1] = frame.Flags;
buffer = buffer.Slice(2);
Bitshifter.WriteUInt31BigEndian(buffer, (uint)frame.StreamId);
output.Advance(Http2FrameReader.HeaderLength);
}
/* https://tools.ietf.org/html/rfc7540#section-6.8
+-+-------------------------------------------------------------+
|R| Last-Stream-ID (31) |
+-+-------------------------------------------------------------+
| Error Code (32) |
+---------------------------------------------------------------+
| Additional Debug Data (*) | (not implemented)
+---------------------------------------------------------------+
*/
public Task WriteGoAwayAsync(int lastStreamId, Http2ErrorCode errorCode)
{
lock (_writeLock)
{
_outgoingFrame.PrepareGoAway(lastStreamId, errorCode);
WriteHeaderUnsynchronized();
var buffer = _outputWriter.GetSpan(8);
Bitshifter.WriteUInt31BigEndian(buffer, (uint)lastStreamId);
buffer = buffer.Slice(4);
BinaryPrimitives.WriteUInt32BigEndian(buffer, (uint)errorCode);
_outputWriter.Advance(8);
return(TimeFlushUnsynchronizedAsync());
}
}
/* https://tools.ietf.org/html/rfc7540#section-6.9
+-+-------------------------------------------------------------+
|R| Window Size Increment (31) |
+-+-------------------------------------------------------------+
*/
public Task WriteWindowUpdateAsync(int streamId, int sizeIncrement)
{
lock (_writeLock)
{
if (_completed)
{
return(Task.CompletedTask);
}
_outgoingFrame.PrepareWindowUpdate(streamId, sizeIncrement);
WriteHeaderUnsynchronized();
var buffer = _outputWriter.GetSpan(4);
Bitshifter.WriteUInt31BigEndian(buffer, (uint)sizeIncrement);
_outputWriter.Advance(4);
return(TimeFlushUnsynchronizedAsync());
}
}
