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96 lines
2.1 KiB
C++
96 lines
2.1 KiB
C++
//
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// TapePRG.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/08/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include "Storage/Tape/Tape.hpp"
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#include "Storage/FileHolder.hpp"
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#include "Storage/TargetPlatforms.hpp"
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#include <cstdint>
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#include <string>
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namespace Storage::Tape {
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/*!
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Provides a @c Tape containing a .PRG, which is a direct local file.
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*/
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class PRG: public Tape {
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public:
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/*!
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Constructs a @c T64 containing content from the file with name @c file_name, of type @c type.
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@param file_name The name of the file to load.
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@throws ErrorBadFormat if this file could not be opened and recognised as the specified type.
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*/
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PRG(const std::string &file_name);
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enum {
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ErrorBadFormat
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};
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private:
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std::unique_ptr<FormatSerialiser> format_serialiser() const override;
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struct Serialiser: public FormatSerialiser, public TargetPlatform::Recipient {
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Serialiser(const std::string &file_name, uint16_t load_address, uint16_t length);
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void set_target_platforms(TargetPlatform::Type) override;
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private:
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bool is_at_end() const override;
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Pulse next_pulse() override;
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void reset() override;
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FileHolder file_;
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uint16_t load_address_;
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uint16_t length_;
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enum FilePhase {
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FilePhaseLeadIn,
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FilePhaseHeader,
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FilePhaseHeaderDataGap,
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FilePhaseData,
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FilePhaseAtEnd
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} file_phase_ = FilePhaseLeadIn;
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int phase_offset_ = 0;
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int bit_phase_ = 3;
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enum OutputToken {
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Leader,
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Zero,
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One,
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WordMarker,
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EndOfBlock,
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Silence
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} output_token_;
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void get_next_output_token();
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uint8_t output_byte_;
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uint8_t check_digit_;
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uint8_t copy_mask_ = 0x80;
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struct Timings {
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Timings(bool is_plus4) :
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leader_zero_length( is_plus4 ? 240 : 179),
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zero_length( is_plus4 ? 240 : 169),
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one_length( is_plus4 ? 480 : 247),
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marker_length( is_plus4 ? 960 : 328) {}
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// The below are in microseconds per pole.
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unsigned int leader_zero_length;
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unsigned int zero_length;
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unsigned int one_length;
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unsigned int marker_length;
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} timings_;
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};
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std::string file_name_;
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uint16_t load_address_;
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uint16_t length_;
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};
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}
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