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92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
#ifndef _FS_FAT32_H
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#define _FS_FAT32_H
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <fs/vfs.h>
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#include <block/block.h>
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#define FAT_ATTR_READ_ONLY 0x01
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#define FAT_ATTR_HIDDEN 0x02
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#define FAT_ATTR_SYSTEM 0x04
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#define FAT_ATTR_VOLUME_ID 0x08
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#define FAT_ATTR_DIRECTORY 0x10
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#define FAT_ATTR_ARCHIVE 0x20
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#define FAT_ATTR_LFN 0x0F
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#define FAT32_EOC_MIN 0x0FFFFFF8
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#define FAT32_EOC_MAX 0x0FFFFFFF
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#define FAT32_BAD_CLUSTER 0x0FFFFFF7
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#define FAT32_FREE_CLUSTER 0x00000000
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/* FAT32 Extended BIOS Parameter Block (BPB) */
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typedef struct {
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uint8_t jmp[3];
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char oem[8];
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uint16_t bytes_per_sector;
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uint8_t sectors_per_cluster;
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uint16_t reserved_sectors;
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uint8_t fat_count;
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uint16_t root_entries;
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uint16_t total_sectors_short;
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uint8_t media_type;
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uint16_t table_size_16;
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uint16_t sectors_per_track;
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uint16_t head_side_count;
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uint32_t hidden_sectors;
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uint32_t total_sectors_32;
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// FAT32 Extended Fields
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uint32_t table_size_32;
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uint16_t extended_flags;
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uint16_t fat_version;
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uint32_t root_cluster;
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uint16_t fat_info;
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uint16_t backup_boot_sector;
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uint8_t reserved[12];
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uint8_t drive_number;
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uint8_t reserved1;
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uint8_t boot_signature;
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uint32_t volume_id;
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char volume_label[11];
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char fat_type_label[8];
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} __attribute__((packed)) fat32_bpb_t;
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/* Standard 32-byte FAT Directory Entry */
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typedef struct {
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char name[11];
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uint8_t attr;
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uint8_t nt_reserved;
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uint8_t creation_time_tenth;
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uint16_t creation_time;
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uint16_t creation_date;
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uint16_t last_access_date;
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uint16_t cluster_high;
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uint16_t write_time;
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uint16_t write_date;
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uint16_t cluster_low;
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uint32_t file_size;
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} __attribute__((packed)) fat32_dirent_t;
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/* In-Memory Mounted FAT32 Filesystem Descriptor */
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typedef struct {
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block_device_t* dev;
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fat32_bpb_t bpb;
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uint32_t fat_begin_lba;
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uint32_t cluster_begin_lba;
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uint32_t sectors_per_cluster;
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uint32_t root_cluster;
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uint32_t total_clusters;
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uint32_t free_clusters;
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char mountpoint[64];
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bool mounted;
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} fat32_fs_t;
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void fat32_init(void);
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vfs_node_t* fat32_mount(const char* block_device_name, const char* mountpoint);
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int fat32_format(const char* block_device_name, const char* volume_label);
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const fat32_fs_t* fat32_get_fs_info(void);
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#endif // _FS_FAT32_H
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