CLK/Storage/Tape/Formats/CSW.hpp

//
//  CSW.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 10/07/2017.
//  Copyright 2017 Thomas Harte. All rights reserved.
//

#pragma once

#include "../Tape.hpp"

#include <string>
#include <vector>
#include <zlib.h>

namespace Storage::Tape {

/*!
	Provides a @c Tape containing a CSW tape image, which is a compressed 1-bit sampling.
*/
class CSW: public Tape {
	public:
		/*!
			Constructs a @c CSW containing content from the file with name @c file_name.

			@throws ErrorNotCSW if this file could not be opened and recognised as a valid CSW file.
		*/
		CSW(const std::string &file_name);

		enum class CompressionType {
			RLE,
			ZRLE
		};

		/*!
			Constructs a @c CSW containing content as specified. Does not throw.
		*/
		CSW(const std::vector<uint8_t> &&data, CompressionType compression_type, bool initial_level, uint32_t sampling_rate);

		enum {
			ErrorNotCSW
		};

		// implemented to satisfy @c Tape
		bool is_at_end();

	private:
		void virtual_reset();
		Pulse virtual_get_next_pulse();

		Pulse pulse_;
		CompressionType compression_type_;

		uint8_t get_next_byte();
		uint32_t get_next_int32le();
		void invert_pulse();

		std::vector<uint8_t> source_data_;
		std::size_t source_data_pointer_;
};

}