CLK/Storage/Tape/Formats/TapePRG.hpp

//
//  TapePRG.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 14/08/2016.
//  Copyright 2016 Thomas Harte. All rights reserved.
//

#pragma once

#include "../Tape.hpp"
#include "../../FileHolder.hpp"

#include <cstdint>
#include <string>

namespace Storage::Tape {

/*!
	Provides a @c Tape containing a .PRG, which is a direct local file.
*/
class PRG: public Tape {
public:
	/*!
		Constructs a @c T64 containing content from the file with name @c file_name, of type @c type.

		@param file_name The name of the file to load.
		@throws ErrorBadFormat if this file could not be opened and recognised as the specified type.
	*/
	PRG(const std::string &file_name);

	enum {
		ErrorBadFormat
	};

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

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

	uint16_t load_address_;
	uint16_t length_;

	enum FilePhase {
		FilePhaseLeadIn,
		FilePhaseHeader,
		FilePhaseHeaderDataGap,
		FilePhaseData,
		FilePhaseAtEnd
	} file_phase_ = FilePhaseLeadIn;
	int phase_offset_ = 0;

	int bit_phase_ = 3;
	enum OutputToken {
		Leader,
		Zero,
		One,
		WordMarker,
		EndOfBlock,
		Silence
	} output_token_;
	void get_next_output_token();
	uint8_t output_byte_;
	uint8_t check_digit_;
	uint8_t copy_mask_ = 0x80;
};

}