Files
file	cpukit/libfs/src/dosfs/fat_file.c
	General operations on "fat-file".
file	cpukit/libfs/src/dosfs/fat_file.h
	Constants/Data Structures/Prototypes for Operations on "fat-file".

Data Structures
struct	fat_file_map_s
	The "fat-file" representation. More...
struct	fat_file_fd_s
	Descriptor of a fat-file. More...

Macros
#define	FAT_FILE_REMOVED 0x01
#define	FAT_FILE_META_DATA_CHANGED 0x02
#define	F_CLU_NUM 0x01
#define	FAT_ROOTDIR_CLUSTER_NUM 0x01
#define	FAT_FD_OF_ROOT_DIR(fat_fd)
#define	FAT_EOF 0x00

Typedefs
typedef struct fat_file_map_s	fat_file_map_t
	The "fat-file" representation.
typedef struct fat_file_fd_s	fat_file_fd_t
	Descriptor of a fat-file.

Enumerations
enum	fat_file_type_t { FAT_DIRECTORY = 0 , FAT_HARD_LINK = 2 , FAT_FILE = 4 }

Functions
int	fat_file_open (fat_fs_info_t fs_info, fat_dir_pos_t dir_pos, fat_file_fd_t **fat_fd)
int	fat_file_reopen (fat_file_fd_t *fat_fd)
int	fat_file_close (fat_fs_info_t fs_info, fat_file_fd_t fat_fd)
ssize_t	fat_file_read (fat_fs_info_t fs_info, fat_file_fd_t fat_fd, uint32_t start, uint32_t count, uint8_t *buf)
ssize_t	fat_file_write (fat_fs_info_t fs_info, fat_file_fd_t fat_fd, uint32_t start, uint32_t count, const uint8_t *buf)
int	fat_file_extend (fat_fs_info_t fs_info, fat_file_fd_t fat_fd, bool zero_fill, uint32_t new_length, uint32_t *a_length)
int	fat_file_truncate (fat_fs_info_t fs_info, fat_file_fd_t fat_fd, uint32_t new_length)
int	fat_file_ioctl (fat_fs_info_t fs_info, fat_file_fd_t fat_fd, int cmd,...)
int	fat_file_size (fat_fs_info_t fs_info, fat_file_fd_t fat_fd)
void	fat_file_mark_removed (fat_fs_info_t fs_info, fat_file_fd_t fat_fd)
int	fat_file_write_first_cluster_num (fat_fs_info_t fs_info, fat_file_fd_t fat_fd)
int	fat_file_write_file_size (fat_fs_info_t fs_info, fat_file_fd_t fat_fd)
int	fat_file_write_time_and_date (fat_fs_info_t fs_info, fat_file_fd_t fat_fd)
int	fat_file_update (fat_fs_info_t fs_info, fat_file_fd_t fat_fd)
int	fat_file_get_new_inode_for (fat_fs_info_t fs_info, fat_dir_pos_t new_dir_pos, fat_file_fd_t *fat_fd)

Detailed Description

Macro Definition Documentation

◆ FAT_FD_OF_ROOT_DIR

#define FAT_FD_OF_ROOT_DIR ( fat_fd )

Value:

((fat_fd->dir_pos.sname.cln == FAT_ROOTDIR_CLUSTER_NUM) && \

(fat_fd->dir_pos.sname.ofs == 0))

Typedef Documentation

◆ fat_file_fd_t

typedef struct fat_file_fd_s fat_file_fd_t

Descriptor of a fat-file.

To each particular clusters chain

◆ fat_file_map_t

typedef struct fat_file_map_s fat_file_map_t

The "fat-file" representation.

the idea is: fat-file is nothing but a cluster chain, any open fat-file is represented in system by fat-file descriptor and has well-known file interface:

fat_file_open() fat_file_close() fat_file_read() fat_file_write()

Such interface hides the architecture of fat-file and represents it like linear file

Files

Data Structures

Macros

Typedefs