private bool TryReadFromUnderlying()
{
// Read payload header
if (!TryRead(_underlying, _payloadBuffer.Data, 0, sizeof(PayloadHeader)))
{
_position = _length = 0;
return(false);
}
var payload = (PayloadHeader *)_payloadBuffer.Ptr;
// Rescale buffers if necessary
if (payload->DataLength > _dataCapacity)
{
_dataBuffer.UpdateSize(_dataCapacity = payload->DataLength);
}
if (payload->PayloadLength > _payloadCapacity)
{
_payloadBuffer.UpdateSize(_payloadCapacity = payload->PayloadLength);
}
// Read payload
if (!TryRead(_underlying, _payloadBuffer.Data, sizeof(PayloadHeader), payload->PayloadLength + 1))
{
_position = _length = 0;
return(false);
}
// Decode payload to the data buffer
_codec.Decode(_payloadBuffer.Ptr + sizeof(PayloadHeader), payload->PayloadLength, (T *)_dataBuffer.Ptr);
_length = payload->DataLength;
_position = 0;
// Validate the checksum
if (*(_payloadBuffer.Ptr + sizeof(PayloadHeader) + payload->PayloadLength) != CHECKSUM)
{
throw new CorruptedDataException("Invalid checksum at the end of column block");
}
return(true);
}
