private async ValueTask <long> TryReadStreamIdAsync()
{
while (_isClosed == 0)
{
var result = await Input.ReadAsync();
var readableBuffer = result.Buffer;
var consumed = readableBuffer.Start;
var examined = readableBuffer.End;
try
{
if (!readableBuffer.IsEmpty)
{
var id = VariableLengthIntegerHelper.GetInteger(readableBuffer, out consumed, out examined);
if (id != -1)
{
return(id);
}
}
if (result.IsCompleted)
{
return(-1);
}
}
finally
{
Input.AdvanceTo(consumed, examined);
}
}
return(-1);
}
internal Task WriteStreamIdAsync(long id)
{
var buffer = _outputWriter.GetSpan(8);
_outputWriter.Advance(VariableLengthIntegerHelper.WriteInteger(buffer, id));
return(_outputWriter.FlushAsync().AsTask());
}
private async ValueTask <long> TryReadStreamHeaderAsync()
{
// https://quicwg.org/base-drafts/draft-ietf-quic-http.html#section-6.2
while (_isClosed == 0)
{
var result = await Input.ReadAsync();
var readableBuffer = result.Buffer;
var consumed = readableBuffer.Start;
var examined = readableBuffer.End;
try
{
if (!readableBuffer.IsEmpty)
{
var id = VariableLengthIntegerHelper.GetInteger(readableBuffer, out consumed, out examined);
if (id != -1)
{
return(id);
}
}
if (result.IsCompleted)
{
return(-1);
}
}
finally
{
Input.AdvanceTo(consumed, examined);
}
}
return(-1);
}
/* 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, Http3RawFrame 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);
}