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139 lines
4.1 KiB
C++
139 lines
4.1 KiB
C++
//
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// Commodore.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 06/11/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Storage_Tape_Parsers_Commodore_hpp
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#define Storage_Tape_Parsers_Commodore_hpp
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#include "TapeParser.hpp"
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#include <memory>
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#include <string>
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namespace Storage {
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namespace Tape {
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namespace Commodore {
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enum class WaveType {
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Short, Medium, Long, Unrecognised
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};
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enum class SymbolType {
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One, Zero, Word, EndOfBlock, LeadIn
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};
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struct Header {
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enum {
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RelocatableProgram,
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NonRelocatableProgram,
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DataSequenceHeader,
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DataBlock,
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EndOfTape,
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Unknown
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} type;
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std::vector<uint8_t> data;
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std::wstring name;
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std::vector<uint8_t> raw_name;
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uint16_t starting_address;
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uint16_t ending_address;
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bool parity_was_valid;
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bool duplicate_matched;
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/*!
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Writes a byte serialised version of this header to @c target, writing at most
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@c length bytes.
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*/
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void serialise(uint8_t *target, uint16_t length);
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};
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struct Data {
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std::vector<uint8_t> data;
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bool parity_was_valid;
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bool duplicate_matched;
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};
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class Parser: public Storage::Tape::PulseClassificationParser<WaveType, SymbolType> {
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public:
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Parser();
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/*!
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Advances to the next block on the tape, treating it as a header, then consumes, parses, and returns it.
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Returns @c nullptr if any wave-encoding level errors are encountered.
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*/
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std::unique_ptr<Header> get_next_header(const std::shared_ptr<Storage::Tape::Tape> &tape);
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/*!
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Advances to the next block on the tape, treating it as data, then consumes, parses, and returns it.
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Returns @c nullptr if any wave-encoding level errors are encountered.
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*/
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std::unique_ptr<Data> get_next_data(const std::shared_ptr<Storage::Tape::Tape> &tape);
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private:
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/*!
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Template for the logic in selecting which of two copies of something to consider authoritative,
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including setting the duplicate_matched flag.
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*/
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template<class ObjectType>
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std::unique_ptr<ObjectType> duplicate_match(std::unique_ptr<ObjectType> first_copy, std::unique_ptr<ObjectType> second_copy);
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std::unique_ptr<Header> get_next_header_body(const std::shared_ptr<Storage::Tape::Tape> &tape, bool is_original);
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std::unique_ptr<Data> get_next_data_body(const std::shared_ptr<Storage::Tape::Tape> &tape, bool is_original);
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/*!
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Finds and completes the next landing zone.
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*/
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void proceed_to_landing_zone(const std::shared_ptr<Storage::Tape::Tape> &tape, bool is_original);
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/*!
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Swallows the next byte; sets the error flag if it is not equal to @c value.
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*/
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void expect_byte(const std::shared_ptr<Storage::Tape::Tape> &tape, uint8_t value);
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uint8_t parity_byte_ = 0;
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void reset_parity_byte();
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uint8_t get_parity_byte();
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void add_parity_byte(uint8_t byte);
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/*!
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Proceeds to the next word marker then returns the result of @c get_next_byte_contents.
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*/
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uint8_t get_next_byte(const std::shared_ptr<Storage::Tape::Tape> &tape);
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/*!
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Reads the next nine symbols and applies a binary test to each to differentiate between ::One and not-::One.
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Returns a byte composed of the first eight of those as bits; sets the error flag if any symbol is not
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::One and not ::Zero, or if the ninth bit is not equal to the odd parity of the other eight.
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*/
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uint8_t get_next_byte_contents(const std::shared_ptr<Storage::Tape::Tape> &tape);
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/*!
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Returns the result of two consecutive @c get_next_byte calls, arranged in little-endian format.
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*/
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uint16_t get_next_short(const std::shared_ptr<Storage::Tape::Tape> &tape);
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/*!
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Per the contract with Analyser::Static::TapeParser; sums time across pulses. If this pulse
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indicates a high to low transition, inspects the time since the last transition, to produce
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a long, medium, short or unrecognised wave period.
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*/
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void process_pulse(const Storage::Tape::Tape::Pulse &pulse) override;
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bool previous_was_high_ = false;
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float wave_period_ = 0.0f;
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/*!
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Per the contract with Analyser::Static::TapeParser; produces any of a word marker, an end-of-block marker,
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a zero, a one or a lead-in symbol based on the currently captured waves.
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*/
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void inspect_waves(const std::vector<WaveType> &waves) override;
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};
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}
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}
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}
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#endif /* Commodore_hpp */
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