// シリアルポート --> 抽象 Stream
protected override async Task <bool> StreamReadFromObjectImplAsync(FastStreamBuffer fifo, CancellationToken cancel)
{
if (this.SerialPort.IsOpen == false)
{
throw new FastBufferDisconnectedException();
}
await TaskUtil.DoAsyncWithTimeout(
async c =>
{
using (MemoryHelper.FastAllocMemoryWithUsing(RecvTmpBufferSize, out Memory <byte> buffer))
{
int recvSize = await this.Stream.ReadAsync(buffer, cancel);
if (recvSize <= 0)
{
fifo.Disconnect();
return(0);
}
fifo.EnqueueWithLock(buffer._SliceHead(recvSize)._CloneMemory(), true);
}
return(0);
},
cancelProc : () =>
{
this.SerialPort.Close();
},
cancel : cancel);
return(true);
}
