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diff --git a/src/lib/formats/sdf_dsk.h b/src/lib/formats/sdf_dsk.h
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+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol, tim lindner
+/*********************************************************************
+
+ formats/sdf_dsk.h
+
+ SDF disk images. Format created by Darren Atkinson for use with
+ his CoCoSDC floppy disk emulator.
+
+*********************************************************************/
+
+#ifndef SDF_DSK_H
+#define SDF_DSK_H
+
+#include "flopimg.h"
+
+/**************************************************************************/
+
+class sdf_format : public floppy_image_format_t
+{
+public:
+ sdf_format();
+
+ virtual int identify(io_generic *io, uint32_t form_factor) override;
+ virtual bool load(io_generic *io, uint32_t form_factor, floppy_image *image) override;
+ virtual bool save(io_generic *io, floppy_image *image) override;
+
+ virtual const char *name() const override;
+ virtual const char *description() const override;
+ virtual const char *extensions() const override;
+ virtual bool supports_save() const override;
+
+protected:
+ static constexpr int HEADER_SIZE = 512;
+ static constexpr int TRACK_HEADER_SIZE = 256;
+ static constexpr int TRACK_SIZE = 6250;
+ static constexpr int TRACK_PADDING = 150;
+ static constexpr int TOTAL_TRACK_SIZE = TRACK_HEADER_SIZE + TRACK_SIZE + TRACK_PADDING;
+
+ static constexpr int SECTOR_SLOT_COUNT = 31;
+};
+
+extern const floppy_format_type FLOPPY_SDF_FORMAT;
+
+#endif /* SDF_DSK_H */