fat16.h File Reference

#include <stdint.h>
#include "fs/file.h"
#include "drivers/disk/disk.h"
#include "drivers/disk/disk_streamer.h"

Go to the source code of this file.

Data Structures
struct	fat16_header_primary
struct	fat16_header_extended
struct	fat_header
union	fat_header::fat_header_extended
union	fat_header_extended
struct	fat_file
struct	fat_directory
struct	fat_item
struct	fat_file_descriptor
struct	fat_private

Macros
#define	DEBUG_FAT16   0
#define	FAT16_SIGNATURE   0x29
#define	FAT16_FAT_ENTRY_SIZE   0x02
#define	FAT16_BAD_SECTOR   0xFF7
#define	FAT16_UNUSED   0x00
#define	FAT_ITEM_TYPE_DIRECTORY   0
#define	FAT_ITEM_TYPE_FILE   1
#define	FAT_FILE_READONLY   0x01
#define	FAT_FILE_HIDDEN   0x02
#define	FAT_FILE_SYSTEM   0x04
#define	FAT_FILE_VOLUME_LABEL   0x08
#define	FAT_FILE_SUBDIRECTORY   0x10
#define	FAT_FILE_ARCHVED   0x20
#define	FAT_FILE_DEVICE   0x40
#define	FAT_FILE_RESERVED   0x80
#define	FAT_FILE_LONGNAME   (FAT_FILE_READONLY | FAT_FILE_HIDDEN | FAT_FILE_SYSTEM | FAT_FILE_VOLUME_LABEL)

Typedefs
typedef unsigned int	FAT_ITEM_TYPE

Functions
struct fat16_header_primary	__attribute__ ((packed))
struct filesystem *	fat16_init_filesystem ()
	Prepares filesystem struct for generic filesystem driver use.
int	fat16_resolve (struct disk *disk)
	FAT16 filesystem resolver.
void *	fat16_open (void *private_fs, struct path_part *path, FILE_MODE mode)
	FAT16 Implementation of fopen.
int	fat16_read (void *private_fs, void *desc, uint32_t size, uint32_t nmemb, char *out)
	FAT16 Implementation of fread.
int	fat16_write (void *private_fs, void *desc, uint32_t size, uint32_t nmemb, char *in)
int	fat16_seek (void *desc, uint32_t offset, FILE_SEEK_MODE seek_mode)
	FAT16 Implementation of fseek.
int	fat16_stat (void *desc, struct file_stat *stat)
	FAT16 Implementation of fstat.
int	fat16_close (void *desc)
	FAT16 Implementation of fclose.

Variables
uint8_t	jmp_short [3]
uint8_t	oem_identifier [8]
uint16_t	bytes_per_sector
uint8_t	sectors_per_cluster
uint16_t	reserved_sectors
uint8_t	fat_copies
uint16_t	root_dir_entries
uint16_t	numeber_of_sectors
uint8_t	media_type
uint16_t	sectors_per_fat
uint16_t	sectors_per_track
uint16_t	number_of_heads
uint32_t	hidden_sectors
uint32_t	sectors_big
uint8_t	drive_number
uint8_t	win_nt_bit
uint8_t	signature
uint32_t	volume_id
uint8_t	volume_id_string [11]
uint8_t	system_id_string [8]
struct fat16_header_primary	primary
union fat_header_extended	shared
uint8_t	filename [8]
uint8_t	ext [3]
uint8_t	attribute
uint8_t	reserved
uint8_t	creation_time_tenths_of_a_sec
uint16_t	creation_time
uint16_t	creation_date
uint16_t	last_access
uint16_t	high_16bits_first_cluster
uint16_t	last_mod_time
uint16_t	last_mod_date
uint16_t	low_16bits_first_cluster
uint32_t	filesize
struct fat_directory	__attribute__

Macro Definition Documentation

DEBUG_FAT16

#define DEBUG_FAT16   0

FAT16_BAD_SECTOR

#define FAT16_BAD_SECTOR   0xFF7

FAT16_FAT_ENTRY_SIZE

#define FAT16_FAT_ENTRY_SIZE   0x02

FAT16_SIGNATURE

#define FAT16_SIGNATURE   0x29

FAT16_UNUSED

#define FAT16_UNUSED   0x00

FAT_FILE_ARCHVED

#define FAT_FILE_ARCHVED   0x20

FAT_FILE_DEVICE

#define FAT_FILE_DEVICE   0x40

FAT_FILE_HIDDEN

#define FAT_FILE_HIDDEN   0x02

FAT_FILE_LONGNAME

#define FAT_FILE_LONGNAME   (FAT_FILE_READONLY | FAT_FILE_HIDDEN | FAT_FILE_SYSTEM | FAT_FILE_VOLUME_LABEL)

FAT_FILE_READONLY

#define FAT_FILE_READONLY   0x01

FAT_FILE_RESERVED

#define FAT_FILE_RESERVED   0x80

FAT_FILE_SUBDIRECTORY

#define FAT_FILE_SUBDIRECTORY   0x10

FAT_FILE_SYSTEM

#define FAT_FILE_SYSTEM   0x04

FAT_FILE_VOLUME_LABEL

#define FAT_FILE_VOLUME_LABEL   0x08

FAT_ITEM_TYPE_DIRECTORY

#define FAT_ITEM_TYPE_DIRECTORY   0

FAT_ITEM_TYPE_FILE

#define FAT_ITEM_TYPE_FILE   1

Typedef Documentation

FAT_ITEM_TYPE

typedef unsigned int FAT_ITEM_TYPE

Function Documentation

__attribute__()

struct fat16_header_primary __attribute__

(

(packed)

)

fat16_close()

int fat16_close

(

void *

desc

)

FAT16 Implementation of fclose.

Parameters

desc	Internal file descriptor

Returns

int Status

References ALL_OK, and kdebug.

fat16_init_filesystem()

struct filesystem * fat16_init_filesystem

(

)

Prepares filesystem struct for generic filesystem driver use.

Returns

struct filesystem*

References fat16_fs, filesystem::name, and strcpy().

fat16_open()

void * fat16_open	(	void *	private_fs,
		struct path_part *	path,
		FILE_MODE	mode
	)

FAT16 Implementation of fopen.

Parameters

private_fs	Private filesystem data
path	Path to file
mode	Open mode (FILE_MODE_READ for readonly)

Returns

void* Pointer to private file descriptor

References fat_file_descriptor::cached_cluster, fat_file_descriptor::cached_offset_bytes, fat_file_descriptor::file, FILE_MODE_READ, kdebug, kzalloc(), path_part::part, and fat_file_descriptor::pos.

fat16_read()

int fat16_read	(	void *	private_fs,
		void *	desc,
		uint32_t	size,
		uint32_t	nmemb,
		char *	out
	)

FAT16 Implementation of fread.

Parameters

private_fs	Private filesystem data
desc	Internal file descriptor
size	Size of block
nmemb	Number of blocks to read
out	Output buffer

Returns

int Status

References ALL_OK, fat_private::cluster_read_stream, fat_item::file, fat_file_descriptor::file, kdebug, offset, fat_file_descriptor::pos, and size.

fat16_resolve()

int fat16_resolve

(

struct disk *

disk

)

FAT16 filesystem resolver.

Parameters

disk	Disk to resolve

Returns

int Status

References ALL_OK, diskstreamer_close(), diskstreamer_new(), diskstreamer_read(), diskstreamer_seek(), EIO, ENOMEM, fat_header::fat_header_extended::extended, fat16_fs, disk::filesystem, disk::fs_private, fat_private::header, disk::id, kdebug, kzalloc(), fat_private::partition_offset, fat_private::root_directory, disk::sector_size, fat_header::shared, fat16_header_extended::signature, partition_entry::starting_lba, and type.

fat16_seek()

int fat16_seek	(	void *	desc,
		uint32_t	offset,
		FILE_SEEK_MODE	seek_mode
	)

FAT16 Implementation of fseek.

Parameters

desc	Internal file descriptor
offset	Offset
seek_mode	Seek mode (SEEK_SET for absolute, SEEK_CUR for relative)

Returns

int Status

References ALL_OK, EINVARG, FAT_ITEM_TYPE_FILE, fat_item::file, fat_file_descriptor::file, fat_file::filesize, kdebug, offset, fat_file_descriptor::pos, SEEK_CUR, SEEK_END, SEEK_SET, and fat_item::type.

fat16_stat()

int fat16_stat	(	void *	desc,
		struct file_stat *	stat
	)

FAT16 Implementation of fstat.

Parameters

desc	Internal file descriptor
stat	Output fstat struct

Returns

int Status

References ALL_OK, assert_not_reached, fat_file::attribute, FAT_FILE_READONLY, FAT_ITEM_TYPE_DIRECTORY, FAT_ITEM_TYPE_FILE, fat_item::file, fat_file_descriptor::file, FILE_STAT_FOLDER, FILE_STAT_READ_ONLY, fat_file::filesize, file_stat::filesize, file_stat::flags, kdebug, and fat_item::type.

fat16_write()

int fat16_write	(	void *	private_fs,
		void *	desc,
		uint32_t	size,
		uint32_t	nmemb,
		char *	in
	)

References ENOTIMPL, kdebug, and size.

Variable Documentation

__attribute__

struct window_message_framebuffer_data __attribute__

attribute

uint8_t attribute

bytes_per_sector

uint16_t bytes_per_sector

creation_date

uint16_t creation_date

creation_time

uint16_t creation_time

creation_time_tenths_of_a_sec

uint8_t creation_time_tenths_of_a_sec

drive_number

uint8_t drive_number

ext

uint8_t ext[3]

fat_copies

uint8_t fat_copies

filename

uint8_t filename[8]

filesize

uint32_t filesize

hidden_sectors

uint32_t hidden_sectors

high_16bits_first_cluster

uint16_t high_16bits_first_cluster

jmp_short

uint8_t jmp_short[3]

last_access

uint16_t last_access

last_mod_date

uint16_t last_mod_date

last_mod_time

uint16_t last_mod_time

low_16bits_first_cluster

uint16_t low_16bits_first_cluster

media_type

uint8_t media_type

number_of_heads

uint16_t number_of_heads

numeber_of_sectors

uint16_t numeber_of_sectors

oem_identifier

uint8_t oem_identifier[8]

primary

struct fat16_header_primary primary

reserved

uint8_t reserved

reserved_sectors

uint16_t reserved_sectors

root_dir_entries

uint16_t root_dir_entries

sectors_big

uint32_t sectors_big

sectors_per_cluster

uint8_t sectors_per_cluster

sectors_per_fat

uint16_t sectors_per_fat

sectors_per_track

uint16_t sectors_per_track

shared

union fat_header_extended shared

signature

uint8_t signature

system_id_string

uint8_t system_id_string[8]

volume_id

uint32_t volume_id

volume_id_string

uint8_t volume_id_string[11]

win_nt_bit

uint8_t win_nt_bit