public static ValueTask <Packet> ReadPacketAsync(BufferedByteReader bufferedByteReader, IByteHandler byteHandler, Func <int?> getNextSequenceNumber, ProtocolErrorBehavior protocolErrorBehavior, IOBehavior ioBehavior)
{
return(bufferedByteReader.ReadBytesAsync(byteHandler, 4, ioBehavior)
.ContinueWith(headerBytes =>
{
if (headerBytes.Count < 4)
{
return protocolErrorBehavior == ProtocolErrorBehavior.Throw ?
ValueTaskExtensions.FromException <Packet>(new EndOfStreamException()) :
default(ValueTask <Packet>);
}
var payloadLength = (int)SerializationUtility.ReadUInt32(headerBytes.Array, headerBytes.Offset, 3);
int packetSequenceNumber = headerBytes.Array[headerBytes.Offset + 3];
var expectedSequenceNumber = getNextSequenceNumber() % 256;
if (expectedSequenceNumber.HasValue && packetSequenceNumber != expectedSequenceNumber.Value)
{
if (protocolErrorBehavior == ProtocolErrorBehavior.Ignore)
{
return default(ValueTask <Packet>);
}
var exception = new InvalidOperationException("Packet received out-of-order. Expected {0}; got {1}.".FormatInvariant(expectedSequenceNumber.Value, packetSequenceNumber));
return ValueTaskExtensions.FromException <Packet>(exception);
}
return bufferedByteReader.ReadBytesAsync(byteHandler, payloadLength, ioBehavior)
.ContinueWith(payloadBytes =>
{
if (payloadBytes.Count < payloadLength)
{
return protocolErrorBehavior == ProtocolErrorBehavior.Throw ?
ValueTaskExtensions.FromException <Packet>(new EndOfStreamException()) :
default(ValueTask <Packet>);
}
return new ValueTask <Packet>(new Packet(packetSequenceNumber, payloadBytes));
});
}));
}
public static ValueTask <ArraySegment <byte> > ReadPayloadAsync(BufferedByteReader bufferedByteReader, IByteHandler byteHandler, Func <int?> getNextSequenceNumber, ArraySegment <byte> previousPayloads, ProtocolErrorBehavior protocolErrorBehavior, IOBehavior ioBehavior)
{
return(ReadPacketAsync(bufferedByteReader, byteHandler, getNextSequenceNumber, protocolErrorBehavior, ioBehavior).ContinueWith(packet =>
ContinueRead(bufferedByteReader, byteHandler, getNextSequenceNumber, previousPayloads, packet, protocolErrorBehavior, ioBehavior)));
}