2021-07-02 22:56:43 +00:00
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//
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// FAT.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 02/07/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef Storage_Disk_Parsers_FAT_hpp
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#define Storage_Disk_Parsers_FAT_hpp
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#include "../Disk.hpp"
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#include <cstdint>
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#include <optional>
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#include <string>
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#include <vector>
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namespace Storage {
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namespace Disk {
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namespace FAT {
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struct File {
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std::string name;
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std::string extension;
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uint8_t attributes = 0;
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uint16_t time = 0; // TODO: offer time/date decoders.
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uint16_t date = 0;
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uint16_t starting_cluster = 0;
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uint32_t size = 0;
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enum Attribute: uint8_t {
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ReadOnly = (1 << 0),
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Hidden = (1 << 1),
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System = (1 << 2),
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VolumeLabel = (1 << 3),
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Directory = (1 << 4),
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Archive = (1 << 5),
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};
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};
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using Directory = std::vector<File>;
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struct Volume {
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uint16_t bytes_per_sector = 0;
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uint8_t sectors_per_cluster = 0;
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2021-07-02 23:28:13 +00:00
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uint16_t reserved_sectors = 0;
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2021-07-02 22:56:43 +00:00
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uint8_t fat_copies = 0;
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uint16_t total_sectors = 0;
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uint16_t sectors_per_fat = 0;
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uint16_t sectors_per_track = 0;
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uint16_t head_count = 0;
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uint16_t hidden_sectors = 0;
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bool correct_signature = false;
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int first_data_sector = 0;
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2021-07-02 23:28:13 +00:00
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std::vector<uint16_t> fat;
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2021-07-02 22:56:43 +00:00
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Directory root_directory;
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struct CHS {
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int cylinder;
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int head;
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int sector;
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};
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/// @returns a direct sector -> CHS address translation.
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CHS chs_for_sector(int sector) const;
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/// @returns the CHS address for the numbered cluster within the data area.
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2021-07-02 23:28:13 +00:00
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int sector_for_cluster(uint16_t cluster) const;
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2021-07-02 22:56:43 +00:00
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};
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std::optional<Volume> GetVolume(const std::shared_ptr<Storage::Disk::Disk> &disk);
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std::optional<std::vector<uint8_t>> GetFile(const std::shared_ptr<Storage::Disk::Disk> &disk, const Volume &volume, const File &file);
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std::optional<Directory> GetDirectory(const std::shared_ptr<Storage::Disk::Disk> &disk, const Volume &volume, const File &file);
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}
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}
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}
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#endif /* FAT_hpp */
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