CLK/Storage/Disk/Formats/SSD.hpp

//
//  SSD.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 18/09/2016.
//  Copyright © 2016 Thomas Harte. All rights reserved.
//

#ifndef SSD_hpp
#define SSD_hpp

#include "../Disk.hpp"
#include "../../FileHolder.hpp"

namespace Storage {
namespace Disk {

/*!
	Provies a @c Disk containing a DSD or SSD disk image — a decoded sector dump of an Acorn DFS disk.
*/
class SSD: public Disk, public Storage::FileHolder {
	public:
		/*!
			Construct an @c SSD containing content from the file with name @c file_name.

			@throws ErrorCantOpen if this file can't be opened.
			@throws ErrorNotSSD if the file doesn't appear to contain a .SSD format image.
		*/
		SSD(const char *file_name);
		~SSD();

		enum {
			ErrorNotSSD,
		};

		// implemented to satisfy @c Disk
		unsigned int get_head_position_count();
		unsigned int get_head_count();
		bool get_is_read_only();

	private:
		void store_updated_track_at_position(unsigned int head, unsigned int position, const std::shared_ptr<Track> &track, std::mutex &file_access_mutex);
		std::shared_ptr<Track> get_uncached_track_at_position(unsigned int head, unsigned int position);
		long get_file_offset_for_position(unsigned int head, unsigned int position);

		unsigned int head_count_;
		unsigned int track_count_;
};

}
}

#endif /* SSD_hpp */