//private int _unflushedBytes;
public Http3FrameWriter(PipeWriter output, ConnectionContext connectionContext, ITimeoutControl timeoutControl, MinDataRate minResponseDataRate, string connectionId, MemoryPool <byte> memoryPool, IKestrelTrace log)
{
_outputWriter = output;
_connectionContext = connectionContext;
_timeoutControl = timeoutControl;
_minResponseDataRate = minResponseDataRate;
_memoryPool = memoryPool;
_log = log;
_outgoingFrame = new Http3Frame();
_flusher = new TimingPipeFlusher(_outputWriter, timeoutControl, log);
_headerEncodingBuffer = new byte[_maxFrameSize];
}
/* https://quicwg.org/base-drafts/draft-ietf-quic-http.html#frame-layout
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (i) ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length (i) ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Frame Payload (*) ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
internal static bool TryReadFrame(ref ReadOnlySequence <byte> readableBuffer, Http3Frame frame, uint maxFrameSize, out ReadOnlySequence <byte> framePayload)
{
framePayload = ReadOnlySequence <byte> .Empty;
var consumed = readableBuffer.Start;
var examined = readableBuffer.Start;
var type = VariableLengthIntegerHelper.GetInteger(readableBuffer, out consumed, out examined);
if (type == -1)
{
return(false);
}
var firstLengthBuffer = readableBuffer.Slice(consumed);
var length = VariableLengthIntegerHelper.GetInteger(firstLengthBuffer, out consumed, out examined);
// Make sure the whole frame is buffered
if (length == -1)
{
return(false);
}
var startOfFramePayload = readableBuffer.Slice(consumed);
if (startOfFramePayload.Length < length)
{
return(false);
}
frame.Length = length;
frame.Type = (Http3FrameType)type;
// The remaining payload minus the extra fields
framePayload = startOfFramePayload.Slice(0, length);
readableBuffer = readableBuffer.Slice(framePayload.End);
return(true);
}