FAT

include/fs/fat.h

struct fat12_16_ext_bpb

Member Type	Member Name
uint8_t	drive_number
uint8_t	reserved
uint8_t	boot_signature
uint32_t	volume_id
uint8_t	volume_label[11]
uint8_t	fs_type[8]
uint8_t	reserved1[448]

struct fat32_ext_bpb

Member Type	Member Name
uint32_t	fat_size_32
uint16_t	ext_flags
uint16_t	fs_version
uint32_t	root_cluster
uint16_t	fs_info
uint16_t	backup_boot_sector
uint8_t	reserved[12]
uint8_t	drive_number
uint8_t	reserved1
uint8_t	boot_signature
uint32_t	volume_id
uint8_t	volume_label[11]
uint8_t	fs_type[8]
uint8_t	reserved2[420]

struct fat_bpb

Member Type	Member Name
uint8_t	jump_boot[3]
uint8_t	oem_name[8]
uint16_t	bytes_per_sector
uint8_t	sectors_per_cluster
uint16_t	reserved_sector_count
uint8_t	num_fats
uint16_t	root_entry_count
uint16_t	total_sectors_16
uint8_t	media
uint16_t	fat_size_16
uint16_t	sectors_per_track
uint16_t	num_heads
uint32_t	hidden_sectors
uint32_t	total_sectors_32
union { struct fat32_ext_bpb ext_32; struct fat12_16_ext_bpb ext_12_16; }	None

struct fat_date

Member Type	Member Name
uint16_t	day
uint16_t	month
uint16_t	year

struct fat_time

Member Type	Member Name
uint16_t	second
uint16_t	minute
uint16_t	hour

struct fat_dirent

Member Type	Member Name
char	name[11]
enum fat_fileattr	attr
uint8_t	ntres
uint8_t	crttimetenth
struct fat_time	crttime
struct fat_date	crtdate
struct fat_date	lastaccess
uint16_t	high_cluster
struct fat_time	modtime
struct fat_date	moddate
uint16_t	low_cluster
uint32_t	filesize

struct fat_fs

Member Type	Member Name
enum fat_fstype	type
struct fat_bpb	*bpb
struct generic_partition	*partition
struct generic_disk	*disk
uint32_t	volume_base_lba
uint32_t	total_clusters
uint32_t	root_cluster
uint32_t	cluster_size
uint32_t	fsinfo_sector
uint32_t	free_clusters
uint32_t	last_alloc_cluster
uint32_t	entries_per_cluster
uint16_t	fat_size
uint8_t	boot_signature
uint8_t	drive_number
uint32_t	volume_id
uint8_t	volume_label[11]
uint8_t	fs_type[8]

enum fat_fstype

Name	Value
FAT_12	None
FAT_16	None
FAT_32	None

enum fat_fileattr

Name	Value
FAT_RO	0x01
FAT_HIDDEN	0x02
FAT_SYSTEM	0x04
FAT_VOL_ID	0x08
FAT_DIR	0x10
FAT_ARCHIVE	0x20

type alias

(*fat_walk_callback) : bool (struct fat_dirent *, uint32_t, void *)

• static inline const char * get_fileattr_string(enum fat_fileattr f)
• struct fat_bpb *fat32_read_bpb(struct generic_partition *)
• void fat12_16_print_bpb(struct fat_bpb *bpb)
• uint32_t fat_eoc(struct fat_fs *fs)
• bool fat_is_eoc(struct fat_fs *fs,uint32_t cluster)
• uint32_t fat_get_dir_cluster(struct fat_dirent *d)
• void fat_format_filename_83(char *name,char out[11])
• uint32_t fat_first_data_sector(struct fat_fs *fs)
• uint32_t fat_cluster_to_lba(struct fat_fs *fs,uint32_t cluster)
• struct fat_datefat_get_current_date()
• struct fat_timefat_get_current_time()
• struct vfs_node *fat_g_mount(struct generic_partition *p)
• void fat_g_print(struct generic_partition *)
• void fat32_print_bpb(struct fat_bpb *bpb)
• void fat_print_dirent(struct fat_dirent *ent)
• void fat_list_root(struct fat_fs *fs)
• bool fat_read_cluster(struct fat_fs *fs,uint32_t cluster,uint8_t *buffer)
• bool fat_write_cluster(struct fat_fs *fs,uint32_t cluster,uint8_t *buffer)
• bool fat_write_dirent(struct fat_fs *fs,uint32_t dir_cluster,struct fat_dirent *dirent_to_write,uint32_t entry_index)
• bool fat_write_fat_entry(struct fat_fs *fs,uint32_t cluster,uint32_t value)
• uint32_t fat_read_fat_entry(struct fat_fs *fs,uint32_t cluster)
• uint32_t fat_alloc_cluster(struct fat_fs *fs)
• void fat_free_chain(struct fat_fs *fs,uint32_t start_cluster)
• void fat_write_fsinfo(struct fat_fs *fs)
• bool fat_create(struct fat_fs *fs,uint32_t dir_cluster,char *filename,struct fat_dirent *out_dirent,enum fat_fileattr attr,uint32_t *out_cluster)
• bool fat_delete(struct fat_fs *fs,uint32_t dir_cluster,char *filename)
• bool fat_rename(struct fat_fs *fs,uint32_t dir_cluster,char *filename,char *new_filename)
• bool fat_read_file(struct fat_fs *fs,struct fat_dirent *ent,uint32_t offset,uint32_t size,uint8_t *out_buf)
• bool fat_write_file(struct fat_fs *fs,struct fat_dirent *ent,uint32_t offset,uint8_t *data,uint32_t size)
• bool fat_walk_cluster(struct fat_fs *fs,uint32_t cluster,fat_walk_callback cb,void *ctx)
• struct fat_dirent *fat_lookup(struct fat_fs *fs,uint32_t cluster,char *f,uint32_t *out_index)
• bool fat_contains(struct fat_fs *fs,uint32_t cluster,char *f)
• bool fat_mkdir(struct fat_fs *fs,uint32_t parent_cluster,char *name,struct fat_dirent *out_dirent)

Defines

• FAT12_PARTITION_TYPE: 0x01 // FAT12, CHS addressing
• FAT16_PARTITION_TYPE: 0x04 // FAT16, CHS addressing (less than 32MB)
• FAT16_PARTITION_TYPE2: 0x06 // FAT16, LBA addressing (greater than 32MB)
• FAT32_PARTITION_TYPE1: 0x0B // FAT32, CHS addressing
• FAT32_PARTITION_TYPE2: 0x0C // FAT32, LBA addressing
• FAT_DIR_CLUSTER_ROOT: 0xFFFFFFFF

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