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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_IMAGE_BUFFER_H
+#define BACKEND_GENESYS_IMAGE_BUFFER_H
+
+#include "enums.h"
+#include "row_buffer.h"
+#include <algorithm>
+#include <functional>
+
+namespace genesys {
+
+// This class allows reading from row-based source in smaller or larger chunks of data
+class ImageBuffer
+{
+public:
+ using ProducerCallback = std::function<bool(std::size_t size, std::uint8_t* out_data)>;
+
+ ImageBuffer() {}
+ ImageBuffer(std::size_t size, ProducerCallback producer);
+
+ std::size_t size() const { return size_; }
+ std::size_t available() const { return size_ - buffer_offset_; }
+
+ bool get_data(std::size_t size, std::uint8_t* out_data);
+
+private:
+ ProducerCallback producer_;
+ std::size_t size_ = 0;
+
+ std::size_t buffer_offset_ = 0;
+ std::vector<std::uint8_t> buffer_;
+};
+
+class FakeBufferModel
+{
+public:
+ FakeBufferModel() {}
+
+ void push_step(std::size_t buffer_size, std::size_t row_bytes);
+
+ std::size_t available_space() const;
+
+ void simulate_read(std::size_t size);
+
+private:
+ std::vector<std::size_t> sizes_;
+ std::vector<std::size_t> available_sizes_;
+ std::vector<std::size_t> row_bytes_;
+};
+
+// This class is similar to ImageBuffer, but preserves historical peculiarities of buffer handling
+// in the backend to preserve exact behavior
+class ImageBufferGenesysUsb
+{
+public:
+ using ProducerCallback = std::function<void(std::size_t size, std::uint8_t* out_data)>;
+
+ ImageBufferGenesysUsb() {}
+ ImageBufferGenesysUsb(std::size_t total_size, const FakeBufferModel& buffer_model,
+ ProducerCallback producer);
+
+ std::size_t remaining_size() const { return remaining_size_; }
+
+ void set_remaining_size(std::size_t bytes) { remaining_size_ = bytes; }
+
+ std::size_t available() const { return buffer_end_ - buffer_offset_; }
+
+ bool get_data(std::size_t size, std::uint8_t* out_data);
+
+private:
+
+ std::size_t get_read_size();
+
+ std::size_t remaining_size_ = 0;
+
+ std::size_t buffer_offset_ = 0;
+ std::size_t buffer_end_ = 0;
+ std::vector<std::uint8_t> buffer_;
+
+ FakeBufferModel buffer_model_;
+
+ ProducerCallback producer_;
+};
+
+} // namespace genesys
+
+#endif // BACKEND_GENESYS_IMAGE_BUFFER_H