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diff --git a/backend/genesys/calibration.h b/backend/genesys/calibration.h
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+   This file is part of the SANE package.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+*/
+
+#ifndef BACKEND_GENESYS_CALIBRATION_H
+#define BACKEND_GENESYS_CALIBRATION_H
+
+#include "sensor.h"
+#include "settings.h"
+#include <ctime>
+
+namespace genesys {
+
+struct Genesys_Calibration_Cache
+{
+    Genesys_Calibration_Cache() = default;
+    ~Genesys_Calibration_Cache() = default;
+
+    // used to check if entry is compatible
+    SetupParams params;
+
+    std::time_t last_calibration = 0;
+
+    Genesys_Frontend frontend;
+    Genesys_Sensor sensor;
+
+    size_t calib_pixels = 0;
+    size_t calib_channels = 0;
+    size_t average_size = 0;
+    std::vector<std::uint16_t> white_average_data;
+    std::vector<std::uint16_t> dark_average_data;
+
+    bool operator==(const Genesys_Calibration_Cache& other) const
+    {
+        return params == other.params &&
+            last_calibration == other.last_calibration &&
+            frontend == other.frontend &&
+            sensor == other.sensor &&
+            calib_pixels == other.calib_pixels &&
+            calib_channels == other.calib_channels &&
+            average_size == other.average_size &&
+            white_average_data == other.white_average_data &&
+            dark_average_data == other.dark_average_data;
+    }
+};
+
+template<class Stream>
+void serialize(Stream& str, Genesys_Calibration_Cache& x)
+{
+    serialize(str, x.params);
+    serialize_newline(str);
+    serialize(str, x.last_calibration);
+    serialize_newline(str);
+    serialize(str, x.frontend);
+    serialize_newline(str);
+    serialize(str, x.sensor);
+    serialize_newline(str);
+    serialize(str, x.calib_pixels);
+    serialize(str, x.calib_channels);
+    serialize(str, x.average_size);
+    serialize_newline(str);
+    serialize(str, x.white_average_data);
+    serialize_newline(str);
+    serialize(str, x.dark_average_data);
+}
+
+} // namespace genesys
+
+#endif // BACKEND_GENESYS_CALIBRATION_H