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65 lines
1.4 KiB
65 lines
1.4 KiB
2 years ago
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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// Internal types and stuff that is needed in the header for declarations,
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// but is not a part of the public API.
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/** Boot Sector structure */
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typedef struct __attribute__((packed))
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{
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// Fields loaded directly from disk:
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// 13 bytes skipped
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uint8_t sectors_per_cluster;
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uint16_t reserved_sectors;
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uint8_t num_fats;
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uint16_t root_entries;
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// 3 bytes skipped
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uint16_t fat_size_sectors;
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// 8 bytes skipped
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uint32_t total_sectors; // if "short size sectors" is used, it's copied here too
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// 7 bytes skipped
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char volume_label[11]; // space padded, no terminator
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// Added fields:
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uint32_t bytes_per_cluster;
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}
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Fat16BootSector;
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/** FAT filesystem handle */
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typedef struct __attribute__((packed))
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{
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// Backing block device
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const BLOCKDEV* dev;
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// Root directory sector start
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uint32_t rd_addr;
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// Start of first cluster (number "2")
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uint32_t data_addr;
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// Start of fat table
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uint32_t fat_addr;
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// Boot sector data struct
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Fat16BootSector bs;
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}
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FAT16;
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/**
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* File Attributes (bit flags)
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* Accessible using file->attribs
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*/
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#define FA_READONLY 0x01 // read only file
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#define FA_HIDDEN 0x02 // hidden file
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#define FA_SYSTEM 0x04 // system file
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#define FA_LABEL 0x08 // volume label entry, found only in root directory.
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#define FA_DIR 0x10 // subdirectory
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#define FA_ARCHIVE 0x20 // archive flag
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