aqhome: make datafile a virtual class. Add datafile_direct.

this is to allow for cached data file handling later.

aqhome/data/datafile_direct_p.h

@@ -0,0 +1,36 @@
+/****************************************************************************
+ * This file is part of the project Gwenhywfar.
+ * Gwenhywfar (c) by 2023 Martin Preuss, all rights reserved.
+ *
+ * The license for this file can be found in the file COPYING which you
+ * should have received along with this file.
+ ****************************************************************************/
+
+#ifndef AQH_DATAFILE_DIRECT_P_H
+#define AQH_DATAFILE_DIRECT_P_H
+
+
+#include "./datafile_direct.h"
+
+#include <gwenhywfar/syncio.h>
+
+
+#define AQH_DATAFILE_RECORDSIZE       16
+#define AQH_DATAFILE_OFFSET_TIMESTAMP 0
+#define AQH_DATAFILE_OFFSET_VALUE     8
+
+
+typedef struct AQH_DATAFILE_DIRECT AQH_DATAFILE_DIRECT;
+struct AQH_DATAFILE_DIRECT {
+  char *fileName;
+  GWEN_SYNCIO *sio;
+  uint64_t numberOfEntries;
+};
+
+
+
+
+
+#endif
+
+