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CLK/Storage/Disk/Parsers/FAT.hpp
2023-05-10 16:02:18 -05:00

76 lines
1.8 KiB
C++

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