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76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
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//
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// Parser.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 24/09/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef Parser_hpp
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#define Parser_hpp
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#include "Sector.hpp"
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#include "../../Controller/DiskController.hpp"
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#include "../../../../NumberTheory/CRC.hpp"
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namespace Storage {
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namespace Encodings {
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namespace MFM {
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class Parser: public Storage::Disk::Controller {
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public:
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Parser(bool is_mfm, const std::shared_ptr<Storage::Disk::Disk> &disk);
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Parser(bool is_mfm, const std::shared_ptr<Storage::Disk::Track> &track);
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/*!
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Attempts to read the sector located at @c track and @c sector.
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@returns a sector if one was found; @c nullptr otherwise.
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*/
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std::shared_ptr<Storage::Encodings::MFM::Sector> get_sector(uint8_t head, uint8_t track, uint8_t sector);
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/*!
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Attempts to read the track at @c track, starting from the index hole.
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Decodes data bits only; clocks are omitted. Synchronisation values begin a new
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byte. If a synchronisation value begins partway through a byte then
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synchronisation-contributing bits will appear both in the preceding byte and
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in the next.
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@returns a vector of data found.
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*/
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std::vector<uint8_t> get_track(uint8_t track);
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private:
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Parser(bool is_mfm);
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std::shared_ptr<Storage::Disk::Drive> drive_;
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unsigned int shift_register_;
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int index_count_;
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uint8_t track_, head_;
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int bit_count_;
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NumberTheory::CRC16 crc_generator_;
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bool is_mfm_;
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void seek_to_track(uint8_t track);
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void process_input_bit(int value);
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void process_index_hole();
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uint8_t get_next_byte();
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uint8_t get_byte_for_shift_value(uint16_t value);
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std::shared_ptr<Storage::Encodings::MFM::Sector> get_next_sector();
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std::shared_ptr<Storage::Encodings::MFM::Sector> get_sector(uint8_t sector);
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std::vector<uint8_t> get_track();
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std::map<int, std::shared_ptr<Storage::Encodings::MFM::Sector>> sectors_by_index_;
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std::set<int> decoded_tracks_;
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int get_index(uint8_t head, uint8_t track, uint8_t sector);
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};
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}
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}
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}
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#endif /* Parser_hpp */
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