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