데이타 구조
struct	fat_dentry
struct	boot_parameter_block
union	boot_parameter_block::type
struct	boot_parameter_block::type::fat16
union	type
struct	type::fat16
struct	DSKSZTOSECPERCLUS
struct	fat32_fsinfo
struct	fat_long_dirent

매크로
#define	SIZEOF_DENTRY   32
#define	ROOT_DIR_SECTORS(bpb)   ((((bpb)->nr_root_entry * SIZEOF_DENTRY) + ((bpb)->sector_size - 1)) / (bpb)->sector_size)
#define	FAT_SIZE(bpb)   ((bpb)->size_of_fat16 ? (bpb)->size_of_fat16 : (bpb)->type.fat32.size_of_fat32)
#define	FIRST_DATA_SECTOR(bpb)   ((bpb)->reserved_sector + ((bpb)->nr_fat * FAT_SIZE(bpb)) + ROOT_DIR_SECTORS(bpb))
#define	FIRST_SECTOR_OF_CLUSTER(bpb, N)   (((N)-2) * ((bpb)->sector_per_cluster) + FIRST_DATA_SECTOR(bpb))
#define	TOTAL_SECTOR(bpb)   ((bpb)->total_sector16 ? (bpb)->total_sector16 : (bpb)->total_sector32)
#define	NR_DATA_SECTOR(bpb)   (TOTAL_SECTOR(bpb) - ((bpb)->reserved_sector + (bpb)->nr_fat * FAT_SIZE(bpb)) + ROOT_DIR_SECTORS(bpb))
#define	COUNT_OF_CLUSTER(bpb)   (NR_DATA_SECTOR(bpb) / (bpb)->sector_per_cluster)
#define	IS_FAT12(bpb)   (COUNT_OF_CLUSTER(bpb) < 4085)
#define	IS_FAT16(bpb)   (!IS_FAT12(bpb) && (COUNT_OF_CLUSTER(bpb) < 65525))
#define	IS_FAT32(bpb)   (COUNT_OF_CLUSTER(bpb) >= 65525)
#define	COUNT_OF_VALID_MAX_CLUSTER(bpb)   (COUNT_OF_CLUSTER(bpb) + 1)
#define	FAT_OFFSET(bpb, N)
#define	THIS_FAT_SECTOR_NUMBER(bpb, N)   (FAT_OFFSET(bpb, (N)) / (bpb)->sector_size)
#define	THIS_FAT_SECTORS(bpb, N)   ((bpb)->reserved_sector + (N) * FAT_SIZE(bpb))
#define	THIS_FAT_OFFSET(bpb, N)   (THIS_FAT_SECTORS(bpb, (N)) * (bpb)->sector_size)
#define	THIS_FAT_ENTRY_OFFSET(bpb, N)   (FAT_OFFSET(bpb, (N)) % (bpb)->sector_size)
#define	TO_WORD(buffer)   ((unsigned short*)(&buffer))
#define	TO_DWORD(buffer)   ((unsigned int*)(&buffer))
#define	FAT_EOF(bpb)   (IS_FAT12(bpb) ? 0x0FF8 : IS_FAT16(bpb) ? 0xFFF8 : IS_FAT32(bpb) ? 0x0FFFFFF8 : 0)
#define	GET_CLUSTER_ENTRY_VALUE(bpb, buffer, N)
#define	SET_CLUSTER_ENTRY_VALUE(bpb, buffer, N, val)
#define	IS_EOF(bpb, val)   (IS_FAT12(bpb) ? (val) >= 0x0FF8 : IS_FAT16(bpb) ? (val) >= 0xFFF8 : IS_FAT32(bpb) ? (val) >= 0x0FFFFFF8 : 0)
#define	BAD_CLUSTER12   0x0FF7
#define	BAD_CLUSTER16   0xFFF7
#define	BAD_CLUSTER32   0x0FFFFFF7
#define	UPDATE_FAT_SIZE(bpb, dsksz)
#define	FIRST_ROOTDIR_SECTOR(bpb)   ((bpb)->reserved_sector + (bpb)->nr_fat * FAT_SIZE(bpb))
#define	GET_FIRST_BLOCK(dentry)   ((dentry)->first_cluster_hi << 16 | (dentry)->first_cluster_lo)
#define	IS_FREE_DENTRY(dirent)   ((unsigned char)((dirent)->name[0] == (unsigned char)0xE5) || ((dirent)->name[0] == 0x00))
#define	IS_KANJI_NAME(dirent)   ((dirent)->name[0] == 0x05)
#define	IS_VALID_CHAR_FOR_NAME(ch)   (!(((ch) != 0x05 && (ch) < 0x20) && (ch) != 0x22 && ((ch) >= 0x2A && (ch) <= 0x2F) && ((ch) >= 0x3A && (ch) <= 0x3F) && (ch) != 0x5B && (ch) != 0x5C && (ch) != 0x5D && (ch) != 0x7C))
#define	DAY_OF_MONTH(ent)   ((ent)->write_date & 0x000Fu)
#define	MONTH_OF_YEAR(ent)   (((ent)->write_date >> 4) & 0x000Fu)
#define	COUNT_OF_YEAR(ent)   (1980 + (((ent)->write_date >> 8) & 0x00FFu))
#define	SECOND_COUNT(ent)   ((ent)->write_time & 0x000Fu)
#define	MINUTES(ent)   (((ent)->write_time >> 4) & 0x003F)
#define	HOURS(ent)   (((ent)->write_time >> 10) & 0x001F)
#define	LAST_LONG_ENTRY   0x40
#define	PATH_MAX   256
#define	IS_LAST_SLOT(ent)   ((ent->ord & LAST_LONG_ENTRY) == 0)

타입정의
typedef struct fat_dentry	fat_dentry_t
typedef struct boot_parameter_block	boot_parameter_block_t
typedef struct fat_long_dirent	fat_slot_t

열거형 타입
enum	dir_attributes {   ATTR_READ_ONLY = 0x01, ATTR_HIDDEN = 0x02, ATTR_SYSTEM = 0x04, ATTR_VOLUME_ID = 0x08,   ATTR_DIRECTORY = 0x10, ATTR_ARCHIVE = 0x20, ATTR_NONE = 0x00, ATTR_EXT = ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID,   ATTR_UNUSED = ATTR_ARCHIVE | ATTR_VOLUME_ID | ATTR_SYSTEM | ATTR_HIDDEN, ATTR_LONG_NAME = ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID, ATTR_LONG_NAME_MASK = ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY | ATTR_ARCHIVE, ATTR_NO_FILE = ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY,   ACTIVE_FLAG = 0x80, EXTENDED = 0x05, DELETED_FLAG = 0xE5 }

함수
struct fat_dentry	__attribute__ ((packed))
int	main (int argc, char *argv[])

변수
unsigned char	name [11]
unsigned char	attribute
unsigned char	reserved
unsigned char	create_time_tenth
unsigned short	create_time
unsigned short	create_date
unsigned short	last_access_date
unsigned short	first_cluster_hi
unsigned short	write_time
unsigned short	write_date
unsigned short	first_cluster_lo
unsigned int	file_size
unsigned char	boot_drive
unsigned char	boot_signature
unsigned int	volume_id
unsigned char	volume_label [11]
unsigned char	fs_type [8]
unsigned char	jmp [2]
unsigned char	nop
unsigned char	oem [8]
unsigned short	sector_size
unsigned char	sector_per_cluster
unsigned short	reserved_sector
unsigned char	nr_fat
unsigned short	nr_root_entry
unsigned short	total_sector16
unsigned char	media_type
unsigned short	size_of_fat16
unsigned short	sector_per_track
unsigned short	nr_head
unsigned int	hidden_sector
unsigned int	total_sector32
union type	type
struct DSKSZTOSECPERCLUS	__attribute__
unsigned int	lead_sig
unsigned char	reserved1 [480]
unsigned int	struct_sig
unsigned int	free_count
unsigned int	next_free
unsigned char	reserved2 [12]
unsigned int	trail_sig
char	ord
unsigned char	name1 [10]
char	checksum
unsigned char	name2 [12]
unsigned char	name3 [4]

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