Fat.c File Reference

#include <Fs/Fat/Fat.h>
#include <Fs/Fat/FatFile.h>
#include <Fs/vdisk.h>
#include <Fs/vfs.h>
#include <Mm/pmmngr.h>
#include <Mm/vmmngr.h>
#include <string.h>
#include <aucon.h>
#include <ctype.h>
#include <_null.h>
#include <Drivers/uart.h>
#include <Mm/kmalloc.h>
#include <Hal/AA64/aa64lowlevel.h>

Include dependency graph for Fat.c:

Functions
uint64_t	FatClusterToSector32 (FatFS *fs, uint64_t cluster)
void	FatToDOSFilename (const char *filename, char *fname, unsigned int fname_length)
uint8_t	FatCalculateCheckSum (uint8_t *filename)
uint8_t	FatCheckDotCount (char *filename)
void	FatFromDosToFilename (char *filename, char *dirfname)
uint32_t	FatReadFAT (AuVFSNode *node, uint64_t cluster_index)
uint32_t	FatFindFreeCluster (AuVFSNode *node)
void	FatAllocCluster (AuVFSNode *fsys, int position, uint32_t n_value)
void	FatClearCluster (AuVFSNode *node, uint32_t cluster)
size_t	FatRead (AuVFSNode *fsys, AuVFSNode *file, uint64_t *buf)
size_t	FatReadFile (AuVFSNode *fsys, AuVFSNode *file, uint64_t *buffer, uint32_t length)
AuVFSNode *	FatLocateSubDir (AuVFSNode *fsys, AuVFSNode *kfile, const char *filename)
bool	isSyscall ()
uint64_t	read_sp ()
AuVFSNode *	FatLocateDir (AuVFSNode *fsys, const char *dir)
AuVFSNode *	FatOpen (AuVFSNode *fsys, char *filename)
size_t	FatGetClusterFor (AuVFSNode *fs, AuVFSNode *file, uint64_t offset)
AuVFSNode *	FatInitialise (AuVDisk *vdisk, char *mountname)
uint16_t	FatFormatDate ()
uint16_t	FatFormatTime ()

Variables
bool	_vfs_debug_on

Function Documentation

FatAllocCluster()

void FatAllocCluster	(	AuVFSNode *	fsys,
		int	position,
		uint32_t	n_value
	)

FatCalculateCheckSum()

uint8_t FatCalculateCheckSum

(

uint8_t *

filename

)

FatCheckDotCount()

uint8_t FatCheckDotCount

(

char *

filename

)

FatClearCluster()

void FatClearCluster	(	AuVFSNode *	node,
		uint32_t	cluster
	)

FatClearCluster – clears a cluster to 0

Parameters

cluster

– cluster to clear

FatClusterToSector32()

uint64_t FatClusterToSector32	(	FatFS *	fs,
		uint64_t	cluster
	)

FatFindFreeCluster()

uint32_t FatFindFreeCluster

(

AuVFSNode *

node

)

FatFormatDate()

uint16_t FatFormatDate

(

)

FatFormatTime()

uint16_t FatFormatTime

(

)

FatFromDosToFilename()

void FatFromDosToFilename	(	char *	filename,
		char *	dirfname
	)

FatGetClusterFor()

size_t FatGetClusterFor	(	AuVFSNode *	fs,
		AuVFSNode *	file,
		uint64_t	offset
	)

FatInitialise()

AuVFSNode * FatInitialise	(	AuVDisk *	vdisk,
		char *	mountname
	)

FatLocateDir()

AuVFSNode * FatLocateDir	(	AuVFSNode *	fsys,
		const char *	dir
	)

FatLocateSubDir()

AuVFSNode * FatLocateSubDir	(	AuVFSNode *	fsys,
		AuVFSNode *	kfile,
		const char *	filename
	)

FatOpen()

AuVFSNode * FatOpen	(	AuVFSNode *	fsys,
		char *	filename
	)

any '\'s in path ?

nope, must be in root directory, search it

found file ?

unable to find

go to next character after first '\'

get pathname

if another '\' or end of line is reached, we are done

copy character

open subdirectory or file

search root dir – open pathname

search a sub directory instead for pathname

found directory or file?

find next '\'

found file?

unable to find

FatRead()

size_t FatRead	(	AuVFSNode *	fsys,
		AuVFSNode *	file,
		uint64_t *	buf
	)

FatRead – read just 4kb portion of a file

Parameters

file	– file structure pointer
buf	– pointer to buffer to store the content

FatReadFAT()

uint32_t FatReadFAT	(	AuVFSNode *	node,
		uint64_t	cluster_index
	)

FatReadFile()

size_t FatReadFile	(	AuVFSNode *	fsys,
		AuVFSNode *	file,
		uint64_t *	buffer,
		uint32_t	length
	)

FatToDOSFilename()

void FatToDOSFilename	(	const char *	filename,
		char *	fname,
		unsigned int	fname_length
	)

FatToDOSFilename – converts a given filename to MSDOS file name format

Parameters

filename	– filename for conversion
fname	– pointer to the buffer to store the conversion
fname_length	– manly 11 buffer[0-8] – filename, buffer[9-11] – file extension

isSyscall()

bool isSyscall ( )

extern

read_sp()

uint64_t read_sp ( )

extern

Variable Documentation

_vfs_debug_on

bool _vfs_debug_on

extern

BSD 2-Clause License

Copyright (c) 2023-2024, Manas Kamal Choudhury All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.