public override int Read(byte[] buffer, int offset, int count)
{
CheckDisposed();
if (!CanRead)
{
throw new InvalidOperationException("Stream not open for reading");
}
var totalRead = 0;
do
{
if (_leftToReadInDataMsg == 0)
{
if (_isConsumed)
{
return(0);
}
var msg = _connector.ReadSingleMessage();
switch (msg.Code)
{
case BackendMessageCode.CopyData:
_leftToReadInDataMsg = ((CopyDataMessage)msg).Length;
break;
case BackendMessageCode.CopyDone:
_connector.ReadExpecting <CommandCompleteMessage>();
_connector.ReadExpecting <ReadyForQueryMessage>();
_isConsumed = true;
goto done;
default:
_connector.State = ConnectorState.Broken;
throw new Exception("Received unexpected message type in COPY OUT: " + msg.Code);
}
}
var len = Math.Min(count, _leftToReadInDataMsg);
_buf.ReadBytesSimple(buffer, offset, len);
offset += len;
count -= len;
_leftToReadInDataMsg -= len;
totalRead += len;
} while (count > 0);
done:
return(totalRead);
}
