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50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
//
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// NIB.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 21/04/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#ifndef NIB_hpp
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#define NIB_hpp
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#include "../DiskImage.hpp"
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#include "../../../FileHolder.hpp"
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#include "../../Track/PCMTrack.hpp"
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#include <memory>
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namespace Storage::Disk {
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/*!
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Provides a @c DiskImage describing an Apple NIB disk image:
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a bit stream capture that omits sync zeroes, and doesn't define
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the means for full reconstruction.
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*/
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class NIB: public DiskImage {
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public:
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NIB(const std::string &file_name);
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// Implemented to satisfy @c DiskImage.
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HeadPosition get_maximum_head_position() final;
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std::shared_ptr<::Storage::Disk::Track> get_track_at_position(::Storage::Disk::Track::Address address) final;
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void set_tracks(const std::map<Track::Address, std::shared_ptr<Track>> &tracks) final;
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bool get_is_read_only() final;
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private:
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FileHolder file_;
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long get_file_offset_for_position(Track::Address address);
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long file_offset(Track::Address address);
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// Cache for the last-generated track, given that head steps on an Apple II
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// occur in quarter-track increments, so there'll routinely be four gets in
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// a row for the same data.
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long cached_offset_ = 0;
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std::shared_ptr<Storage::Disk::PCMTrack> cached_track_;
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};
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}
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#endif /* NIB_hpp */
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