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CLK/Storage/Tape/Parsers/MSX.hpp
2024-01-16 23:34:46 -05:00

50 lines
1.2 KiB
C++

//
// MSX.hpp
// Clock Signal
//
// Created by Thomas Harte on 26/12/2017.
// Copyright 2017 Thomas Harte. All rights reserved.
//
#pragma once
#include "../Tape.hpp"
#include <memory>
#include <cstdint>
namespace Storage::Tape::MSX {
class Parser {
public:
struct FileSpeed {
uint8_t minimum_start_bit_duration; // i.e. LOWLIM
uint8_t low_high_disrimination_duration; // i.e. WINWID
};
/*!
Finds the next header from the tape, determining constants for the
speed of file expected ahead.
Attempts exactly to duplicate the MSX's TAPION function.
@param tape_player The tape player containing the tape to search.
@returns An instance of FileSpeed if a header is found before the end of the tape;
@c nullptr otherwise.
*/
static std::unique_ptr<FileSpeed> find_header(Storage::Tape::BinaryTapePlayer &tape_player);
/*!
Attempts to read the next byte from the cassette, with data encoded
at the rate as defined by @c speed.
Attempts exactly to duplicate the MSX's TAPIN function.
@returns A value in the range 0-255 if a byte is found before the end of the tape;
-1 otherwise.
*/
static int get_byte(const FileSpeed &speed, Storage::Tape::BinaryTapePlayer &tape_player);
};
}