fat16.c File Reference

#include "fat16.h"
#include "common/string.h"
#include "common/status.h"
#include "memory/memory.h"
#include "memory/heap/kheap.h"
#include "kernel.h"
#include "common/assert.h"

Functions
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
struct filesystem	fat16_fs
	Describes driver as filesystem struct for generic filesystem driver use.

Function Documentation

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

fat16_fs

struct filesystem fat16_fs

Initial value:

= 
{
    .resolve = fat16_resolve,
    .open = fat16_open,
    .read = fat16_read,
    .seek = fat16_seek,
    .stat = fat16_stat,
    .close = fat16_close,
    .write = fat16_write,
}

Describes driver as filesystem struct for generic filesystem driver use.