/*----------------------------------------------------------------------------/
/  FatFs - FAT file system module  R0.07e                    (C)ChaN, 2009
/-----------------------------------------------------------------------------/
/ FatFs module is a generic FAT file system module for small embedded systems.
/ This is a free software that opened for education, research and commercial
/ developments under license policy of following trems.
/
/  Copyright (C) 2009, ChaN, all right reserved.
/
/ * The FatFs module is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/   personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/
/-----------------------------------------------------------------------------/
/ Feb 26,'06 R0.00  Prototype.
/
/ Apr 29,'06 R0.01  First stable version.
/
/ Jun 01,'06 R0.02  Added FAT12 support.
/                   Removed unbuffered mode.
/                   Fixed a problem on small (<32M) patition.
/ Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
/
/ Sep 22,'06 R0.03  Added f_rename().
/                   Changed option _FS_MINIMUM to _FS_MINIMIZE.
/ Dec 11,'06 R0.03a Improved cluster scan algolithm to write files fast.
/                   Fixed f_mkdir() creates incorrect directory on FAT32.
/
/ Feb 04,'07 R0.04  Supported multiple drive system.
/                   Changed some interfaces for multiple drive system.
/                   Changed f_mountdrv() to f_mount().
/                   Added f_mkfs().
/ Apr 01,'07 R0.04a Supported multiple partitions on a plysical drive.
/                   Added a capability of extending file size to f_lseek().
/                   Added minimization level 3.
/                   Fixed an endian sensitive code in f_mkfs().
/ May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
/                   Added FSInfo support.
/                   Fixed DBCS name can result FR_INVALID_NAME.
/                   Fixed short seek (<= csize) collapses the file object.
/
/ Aug 25,'07 R0.05  Changed arguments of f_read(), f_write() and f_mkfs().
/                   Fixed f_mkfs() on FAT32 creates incorrect FSInfo.
/                   Fixed f_mkdir() on FAT32 creates incorrect directory.
/ Feb 03,'08 R0.05a Added f_truncate() and f_utime().
/                   Fixed off by one error at FAT sub-type determination.
/                   Fixed btr in f_read() can be mistruncated.
/                   Fixed cached sector is not flushed when create and close
/                   without write.
/
/ Apr 01,'08 R0.06  Added fputc(), fputs(), fprintf() and fgets().
/                   Improved performance of f_lseek() on moving to the same
/                   or following cluster.
/
/ Apr 01,'09 R0.07  Merged Tiny-FatFs as a buffer configuration option.
/                   Added long file name support.
/                   Added multiple code page support.
/                   Added re-entrancy for multitask operation.
/                   Added auto cluster size selection to f_mkfs().
/                   Added rewind option to f_readdir().
/                   Changed result code of critical errors.
/                   Renamed string functions to avoid name collision.
/ Apr 14,'09 R0.07a Separated out OS dependent code on reentrant cfg.
/                   Added multiple sector size support.
/ Jun 21,'09 R0.07c Fixed f_unlink() can return FR_OK on error.
/                   Fixed wrong cache control in f_lseek().
/                   Added relative path feature.
/                   Added f_chdir() and f_chdrive().
/                   Added proper case conversion to extended char.
/ Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h.
/                   Fixed f_unlink() fails to remove a sub-dir on _FS_RPATH.
/                   Fixed name matching error on the 13 char boundary.
/                   Added a configuration option, _LFN_UNICODE.
/                   Changed f_readdir() to return the SFN with always upper
/                   case on non-LFN cfg.
/---------------------------------------------------------------------------*/
#include "ff.h"						/* FatFs configurations and declarations */
#include "diskio.h"					/* Declarations of low level disk I/O functions */

/*--------------------------------------------------------------------------

   Module Private Definitions

---------------------------------------------------------------------------*/
#if _FATFS != 0x007E
	#error Wrong include file (ff.h).
#endif
#if _FS_REENTRANT
	#if _USE_LFN == 1
		#error Static LFN work area must not be used in re-entrant configuration.
	#endif
	#define ENTER_FF( fs )	   \
	{						   \
		if( !lock_fs(fs) )	   \
		{					   \
			return FR_TIMEOUT; \
		}					   \
	}

	#define LEAVE_FF( fs, res ) \
	{							\
		unlock_fs( fs, res );	\
		return res;				\
	}

#else
	#define ENTER_FF( fs )
	#define LEAVE_FF( fs, res ) return res
#endif
#define ABORT( fs, res )	   \
	{						   \
		fp->flag |= FA__ERROR; \
		LEAVE_FF( fs, res );   \
	}

#ifndef NULL
	#define NULL	0
#endif

/* Name status flags */
#define NS		11					/* Offset of name status byte */
#define NS_LOSS 0x01				/* Out of 8.3 format */
#define NS_LFN	0x02				/* Force to create LFN entry */
#define NS_LAST 0x04				/* Last segment */
#define NS_BODY 0x08				/* Lower case flag (body) */
#define NS_EXT	0x10				/* Lower case flag (ext) */
#define NS_DOT	0x20				/* Dot entry */

/*--------------------------------------------------------------------------

   Private Work Area

---------------------------------------------------------------------------*/
#if _DRIVES < 1 || _DRIVES > 9
	#error Number of drives must be 1-9.
#endif
static FATFS	*FatFs[_DRIVES];	/* Pointer to the file system objects (logical drives) */

static WORD		Fsid;				/* File system mount ID */

#if _FS_RPATH
static BYTE		Drive;				/* Current drive */
#endif
#if _USE_LFN == 1					/* LFN with static LFN working buffer */
static WCHAR	LfnBuf[_MAX_LFN + 1];
	#define NAMEBUF( sp, lp ) \
	BYTE  sp[12];			  \
	WCHAR						*lp = LfnBuf
	#define INITBUF( dj, sp, lp ) \
	dj.fn = sp;					  \
	dj.lfn = lp

#elif _USE_LFN > 1					/* LFN with dynamic LFN working buffer */
	#define NAMEBUF( sp, lp ) \
	BYTE sp[12];			  \
	WCHAR	lbuf[_MAX_LFN + 1], *lp = lbuf
	#define INITBUF( dj, sp, lp ) \
	dj.fn = sp;					  \
	dj.lfn = lp

#else /* No LFN */
	#define NAMEBUF( sp, lp )		BYTE sp[12]
	#define INITBUF( dj, sp, lp )	dj.fn = sp
#endif

/*--------------------------------------------------------------------------

   Module Private Functions

---------------------------------------------------------------------------*/

/*-----------------------------------------------------------------------*/

/* String functions                                                      */

/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static void mem_cpy ( void *dst, const void *src, int cnt )
{
	char *d = ( char * ) dst;
	const char *s = ( const char * ) src;
	while( cnt-- )
	{
		*d++ = *s++;
	}
}

/* Fill memory */
static void mem_set ( void *dst, int val, int cnt )
{
	char *d = ( char * ) dst;
	while( cnt-- )
	{
		*d++ = ( char ) val;
	}
}

/* Compare memory to memory */
static int mem_cmp ( const void *dst, const void *src, int cnt )
{
	const char *d = ( const char * ) dst, *s = ( const char * ) src;
	int r = 0;
	while( cnt-- && (r = *d++ -*s++) == 0 );
	return r;
}

/* Check if chr is contained in the string */
static int chk_chr ( const char *str, int chr )
{
	while( *str && *str != chr )
	{
		str++;
	}

	return *str;
}

/*-----------------------------------------------------------------------*/

/* Request/Release grant to access the volume                            */

/*-----------------------------------------------------------------------*/
#if _FS_REENTRANT
static BOOL lock_fs ( FATFS * fs /* File system object */ )
{
	return ff_req_grant( fs->sobj );
}

static void unlock_fs ( FATFS * fs, /* File system object */ FRESULT res /* Result code to be returned */ )
{
	if( res != FR_NOT_ENABLED && res != FR_INVALID_DRIVE && res != FR_INVALID_OBJECT && res != FR_TIMEOUT )
	{
		ff_rel_grant( fs->sobj );
	}
}

#endif

/*-----------------------------------------------------------------------*/

/* Change window offset                                                  */

/*-----------------------------------------------------------------------*/
static FRESULT move_window ( FATFS * fs, /* File system object */ DWORD sector /* Sector number to make apperance in the fs->win[] */ ) /* Move to zero only writes back dirty window */
{
	DWORD wsect;

	wsect = fs->winsect;
	if( wsect != sector )
	{				/* Changed current window */
		#if !_FS_READONLY
		if( fs->wflag )
		{			/* Write back dirty window if needed */
			if( disk_write(fs->drive, fs->win, wsect, 1) != RES_OK )
			{
				return FR_DISK_ERR;
			}

			fs->wflag = 0;
			if( wsect < (fs->fatbase + fs->sects_fat) )
			{		/* In FAT area */
				BYTE nf;
				for( nf = fs->n_fats; nf > 1; nf-- )
				{	/* Refrect the change to all FAT copies */
					wsect += fs->sects_fat;
					disk_write( fs->drive, fs->win, wsect, 1 );
				}
			}
		}

		#endif
		if( sector )
		{
			if( disk_read(fs->drive, fs->win, sector, 1) != RES_OK )
			{
				return FR_DISK_ERR;
			}

			fs->winsect = sector;
		}
	}

	return FR_OK;
}

/*-----------------------------------------------------------------------*/

/* Clean-up cached data                                                  */

/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static FRESULT sync ( /* FR_OK: successful, FR_DISK_ERR: failed */ FATFS * fs /* File system object */ )
{
	FRESULT res;

	res = move_window( fs, 0 );
	if( res == FR_OK )
	{
		/* Update FSInfo sector if needed */
		if( fs->fs_type == FS_FAT32 && fs->fsi_flag )
		{
			fs->winsect = 0;
			mem_set( fs->win, 0, 512 );
			ST_WORD( fs->win + BS_55AA, 0xAA55 );
			ST_DWORD( fs->win + FSI_LeadSig, 0x41615252 );
			ST_DWORD( fs->win + FSI_StrucSig, 0x61417272 );
			ST_DWORD( fs->win + FSI_Free_Count, fs->free_clust );
			ST_DWORD( fs->win + FSI_Nxt_Free, fs->last_clust );
			disk_write( fs->drive, fs->win, fs->fsi_sector, 1 );
			fs->fsi_flag = 0;
		}

		/* Make sure that no pending write process in the physical drive */
		if( disk_ioctl(fs->drive, CTRL_SYNC, ( void * ) NULL) != RES_OK )
		{
			res = FR_DISK_ERR;
		}
	}

	return res;
}

#endif

/*-----------------------------------------------------------------------*/

/* FAT access - Read value of a FAT entry                                */

/*-----------------------------------------------------------------------*/
DWORD get_fat
	(				/* 0xFFFFFFFF:Disk error, 1:Interal error, Else:Cluster status */
		FATFS * fs, /* File system object */ DWORD clst /* Cluster# to get the link information */
	)
{
	UINT wc, bc;
	DWORD fsect;

	if( clst < 2 || clst >= fs->max_clust )
	{					/* Range check */
		return 1;
	}

	fsect = fs->fatbase;
	switch( fs->fs_type )
	{
		case FS_FAT12:
			bc = clst;
			bc += bc / 2;
			if( move_window(fs, fsect + (bc / SS(fs))) )
			{
				break;
			}

			wc = fs->win[bc & ( SS(fs) - 1 )];
			bc++;
			if( move_window(fs, fsect + (bc / SS(fs))) )
			{
				break;
			}

			wc |= ( WORD ) fs->win[bc & ( SS(fs) - 1 )] << 8;
			return( clst & 1 ) ? ( wc >> 4 ) : ( wc & 0xFFF );

		case FS_FAT16:
			if( move_window(fs, fsect + (clst / (SS(fs) / 2))) )
			{
				break;
			}

			return LD_WORD( &fs->win[((WORD) clst * 2) & (SS(fs) - 1)] );

		case FS_FAT32:
			if( move_window(fs, fsect + (clst / (SS(fs) / 4))) )
			{
				break;
			}

			return
			LD_DWORD( &fs->win[((WORD) clst * 4) & (SS(fs) - 1)] )
			& 0x0FFFFFFF;
	}

	return 0xFFFFFFFF;	/* An error occured at the disk I/O layer */
}

/*-----------------------------------------------------------------------*/

/* FAT access - Change value of a FAT entry                              */

/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
FRESULT put_fat
	( FATFS * fs, /* File system object */ DWORD clst, /* Cluster# to be changed in range of 2 to fs->max_clust - 1 */ DWORD val	/* New value to mark the cluster */ )
{
	UINT bc;
	BYTE * p;
	DWORD fsect;
	FRESULT res;

	if( clst < 2 || clst >= fs->max_clust )
	{					/* Range check */
		res = FR_INT_ERR;
	}
	else
	{
		fsect = fs->fatbase;
		switch( fs->fs_type )
		{
			case FS_FAT12:
				bc = clst;
				bc += bc / 2;
				res = move_window( fs, fsect + (bc / SS(fs)) );
				if( res != FR_OK )
				{
					break;
				}

				p = &fs->win[bc & ( SS(fs) - 1 )];
				*p = ( clst & 1 ) ? ( (*p & 0x0F) | ((BYTE) val << 4) ) : ( BYTE ) val;
				bc++;
				fs->wflag = 1;
				res = move_window( fs, fsect + (bc / SS(fs)) );
				if( res != FR_OK )
				{
					break;
				}

				p = &fs->win[bc & ( SS(fs) - 1 )];
				*p = ( clst & 1 ) ? ( BYTE ) ( val >> 4 ) : ( (*p & 0xF0) | ((BYTE) (val >> 8) & 0x0F) );
				break;

			case FS_FAT16:
				res = move_window( fs, fsect + (clst / (SS(fs) / 2)) );
				if( res != FR_OK )
				{
					break;
				}

				ST_WORD( &fs->win[((WORD) clst * 2) & (SS(fs) - 1)], (WORD) val );
				break;

			case FS_FAT32:
				res = move_window( fs, fsect + (clst / (SS(fs) / 4)) );
				if( res != FR_OK )
				{
					break;
				}

				ST_DWORD( &fs->win[((WORD) clst * 4) & (SS(fs) - 1)], val );
				break;

			default:
				res = FR_INT_ERR;
		}

		fs->wflag = 1;
	}

	return res;
}

#endif /* !_FS_READONLY */

/*-----------------------------------------------------------------------*/

/* FAT handling - Remove a cluster chain                                 */

/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static FRESULT remove_chain ( FATFS * fs, /* File system object */ DWORD clst /* Cluster# to remove a chain from */ )
{
	FRESULT res;
	DWORD nxt;

	if( clst < 2 || clst >= fs->max_clust )
	{					/* Check the range of cluster# */
		res = FR_INT_ERR;
	}
	else
	{
		res = FR_OK;
		while( clst < fs->max_clust )
		{				/* Not a last link? */
			nxt = get_fat( fs, clst );	/* Get cluster status */
			if( nxt == 0 )
			{
				break;					/* Empty cluster? */
			}

			if( nxt == 1 )
			{
				res = FR_INT_ERR;
				break;
			}	/* Internal error? */
			if( nxt == 0xFFFFFFFF )
			{
				res = FR_DISK_ERR;
				break;
			}	/* Disk error? */
			res = put_fat( fs, clst, 0 );	/* Mark the cluster "empty" */
			if( res != FR_OK )
			{
				break;
			}

			if( fs->free_clust != 0xFFFFFFFF )
			{			/* Update FSInfo */
				fs->free_clust++;
				fs->fsi_flag = 1;
			}

			clst = nxt; /* Next cluster */
		}
	}

	return res;
}

#endif

/*-----------------------------------------------------------------------*/

/* FAT handling - Stretch or Create a cluster chain                      */

/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static DWORD create_chain
	(					/* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
		FATFS * fs, /* File system object */ DWORD clst /* Cluster# to stretch. 0 means create a new chain. */
	)
{
	DWORD cs, ncl, scl, mcl;

	mcl = fs->max_clust;
	if( clst == 0 )
	{	/* Create new chain */
		scl = fs->last_clust;	/* Get suggested start point */
		if( scl == 0 || scl >= mcl )
		{
			scl = 1;
		}
	}
	else
	{	/* Stretch existing chain */
		cs = get_fat( fs, clst );	/* Check the cluster status */
		if( cs < 2 )
		{
			return 1;				/* It is an invalid cluster */
		}

		if( cs < mcl )
		{
			return cs;				/* It is already followed by next cluster */
		}

		scl = clst;
	}

	ncl = scl;						/* Start cluster */
	for( ;; )
	{
		ncl++;						/* Next cluster */
		if( ncl >= mcl )
		{					/* Wrap around */
			ncl = 2;
			if( ncl > scl )
			{
				return 0;	/* No free custer */
			}
		}

		cs = get_fat( fs, ncl );	/* Get the cluster status */
		if( cs == 0 )
		{
			break;					/* Found a free cluster */
		}

		if( cs == 0xFFFFFFFF || cs == 1 )
		{					/* An error occured */
			return cs;
		}

		if( ncl == scl )
		{
			return 0;		/* No free custer */
		}
	}

	if( put_fat(fs, ncl, 0x0FFFFFFF) )
	{						/* Mark the new cluster "in use" */
		return 0xFFFFFFFF;
	}

	if( clst != 0 )
	{						/* Link it to the previous one if needed */
		if( put_fat(fs, clst, ncl) )
		{
			return 0xFFFFFFFF;
		}
	}

	fs->last_clust = ncl;	/* Update FSINFO */
	if( fs->free_clust != 0xFFFFFFFF )
	{
		fs->free_clust--;
		fs->fsi_flag = 1;
	}

	return ncl;				/* Return new cluster number */
}

#endif /* !_FS_READONLY */

/*-----------------------------------------------------------------------*/

/* Get sector# from cluster#                                             */

/*-----------------------------------------------------------------------*/
DWORD clust2sect
	( /* !=0: Sector number, 0: Failed - invalid cluster# */ FATFS * fs, /* File system object */ DWORD clst /* Cluster# to be converted */ )
{
	clst -= 2;
	if( clst >= (fs->max_clust - 2) )
	{
		return 0;			/* Invalid cluster# */
	}

	return clst * fs->csize + fs->database;
}

/*-----------------------------------------------------------------------*/

/* Directory handling - Seek directory index                             */

/*-----------------------------------------------------------------------*/
static FRESULT dir_seek ( DIR * dj, /* Pointer to directory object */ WORD idx /* Directory index number */ )
{
	DWORD clst;
	WORD ic;

	dj->index = idx;
	clst = dj->sclust;
	if( clst == 1 || clst >= dj->fs->max_clust )
	{						/* Check start cluster range */
		return FR_INT_ERR;
	}

	if( !clst && dj->fs->fs_type == FS_FAT32 )
	{						/* Replace cluster# 0 with root cluster# if in FAT32 */
		clst = dj->fs->dirbase;
	}

	if( clst == 0 )
	{						/* Static table */
		dj->clust = clst;
		if( idx >= dj->fs->n_rootdir )
		{					/* Index is out of range */
			return FR_INT_ERR;
		}

		dj->sect = dj->fs->dirbase + idx / ( SS(dj->fs) / 32 ); /* Sector# */
	}
	else
	{	/* Dynamic table */
		ic =
		SS( dj->fs )
		/ 32 * dj->fs->csize;				/* Entries per cluster */
		while( idx >= ic )
		{									/* Follow cluster chain */
			clst = get_fat( dj->fs, clst ); /* Get next cluster */
			if( clst == 0xFFFFFFFF )
			{
				return FR_DISK_ERR;			/* Disk error */
			}

			if( clst < 2 || clst >= dj->fs->max_clust )
			{	/* Reached to end of table or int error */
				return FR_INT_ERR;
			}

			idx -= ic;
		}

		dj->clust = clst;
		dj->sect =
		clust2sect( dj->fs, clst )
		+ idx / ( SS(dj->fs) / 32 );	/* Sector# */
	}

	dj->dir = dj->fs->win + ( idx % (SS(dj->fs) / 32) ) * 32;	/* Ptr to the entry in the sector */

	return FR_OK;	/* Seek succeeded */
}

/*-----------------------------------------------------------------------*/

/* Directory handling - Move directory index next                        */

/*-----------------------------------------------------------------------*/
static FRESULT dir_next
	(				/* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not streach */
		DIR *
		dj, /* Pointer to directory object */ BOOL streach	/* FALSE: Do not streach table, TRUE: Streach table if needed */
	)
{
	DWORD clst;
	WORD i;

	i = dj->index + 1;
	if( !i || !dj->sect )
	{				/* Report EOT when index has reached 65535 */
		return FR_NO_FILE;
	}

	if( !(i % (SS(dj->fs) / 32)) )
	{				/* Sector changed? */
		dj->sect++; /* Next sector */

		if( dj->clust == 0 )
		{			/* Static table */
			if( i >= dj->fs->n_rootdir )
			{		/* Report EOT when end of table */
				return FR_NO_FILE;
			}
		}
		else
		{			/* Dynamic table */
			if( ((i / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0 )
			{		/* Cluster changed? */
				clst = get_fat( dj->fs, dj->clust );	/* Get next cluster */
				if( clst <= 1 )
				{
					return FR_INT_ERR;
				}

				if( clst == 0xFFFFFFFF )
				{
					return FR_DISK_ERR;
				}

				if( clst >= dj->fs->max_clust )
				{	/* When it reached end of dynamic table */
					#if !_FS_READONLY
					BYTE c;
					if( !streach )
					{
						return FR_NO_FILE;						/* When do not streach, report EOT */
					}

					clst = create_chain( dj->fs, dj->clust );	/* Streach cluster chain */
					if( clst == 0 )
					{
						return FR_DENIED;						/* No free cluster */
					}

					if( clst == 1 )
					{
						return FR_INT_ERR;
					}

					if( clst == 0xFFFFFFFF )
					{
						return FR_DISK_ERR;
					}

					/* Clean-up streached table */
					if( move_window(dj->fs, 0) )
					{
						return FR_DISK_ERR;						/* Flush active window */
					}

					mem_set( dj->fs->win, 0, SS(dj->fs) );		/* Clear window buffer */
					dj->fs->winsect = clust2sect( dj->fs, clst );	/* Cluster start sector */
					for( c = 0; c < dj->fs->csize; c++ )
					{						/* Fill the new cluster with 0 */
						dj->fs->wflag = 1;
						if( move_window(dj->fs, 0) )
						{
							return FR_DISK_ERR;
						}

						dj->fs->winsect++;
					}

					dj->fs->winsect -= c;	/* Rewind window address */
					#else
					return FR_NO_FILE;		/* Report EOT */
					#endif
				}

				dj->clust = clst;			/* Initialize data for new cluster */
				dj->sect = clust2sect( dj->fs, clst );
			}
		}
	}

	dj->index = i;
	dj->dir = dj->fs->win + ( i % (SS(dj->fs) / 32) ) * 32;

	return FR_OK;
}

/*-----------------------------------------------------------------------*/

/* LFN handling - Test/Pick/Fit an LFN segment from/to directory entry   */

/*-----------------------------------------------------------------------*/
#if _USE_LFN
static const BYTE LfnOfs[] = { 1, 3, 5, 7, 9, 14, 16, 18, 20, 22, 24, 28, 30 };

/* Offset of LFN chars in the directory entry */

static BOOL cmp_lfn
	(					/* TRUE:Matched, FALSE:Not matched */
		WCHAR *lfnbuf,	/* Pointer to the LFN to be compared */
		BYTE *dir		/* Pointer to the directory entry containing a part of LFN */
	)
{
	int		i, s;
	WCHAR	wc, uc;

	i = ( (dir[LDIR_Ord] & 0xBF) - 1 ) * 13;	/* Get offset in the LFN buffer */
	s = 0;
	wc = 1;
	do
	{
		uc = LD_WORD( dir + LfnOfs[s] );		/* Pick an LFN character from the entry */
		if( wc )
		{	/* Last char has not been processed */
			wc = ff_wtoupper( uc ); /* Convert it to upper case */
			if( i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++]) )
			{						/* Compare it */
				return FALSE;		/* Not matched */
			}
		}
		else
		{
			if( uc != 0xFFFF )
			{
				return FALSE;		/* Check filler */
			}
		}
	} while( ++s < 13 );

	/* Repeat until all chars in the entry are checked */

	if( (dir[LDIR_Ord] & 0x40) && wc && lfnbuf[i] )
	{				/* Last segment matched but different length */
		return FALSE;
	}

	return TRUE;	/* The part of LFN matched */
}

static BOOL pick_lfn
	(					/* TRUE:Succeeded, FALSE:Buffer overflow */
		WCHAR *lfnbuf,	/* Pointer to the Unicode-LFN buffer */
		BYTE *dir		/* Pointer to the directory entry */
	)
{
	int		i, s;
	WCHAR	wc, uc;

	i = ( (dir[LDIR_Ord] & 0x3F) - 1 ) * 13;	/* Offset in the LFN buffer */

	s = 0;
	wc = 1;
	do
	{
		uc = LD_WORD( dir + LfnOfs[s] );		/* Pick an LFN character from the entry */
		if( wc )
		{						/* Last char has not been processed */
			if( i >= _MAX_LFN )
			{
				return FALSE;	/* Buffer overflow? */
			}

			lfnbuf[i++] = wc = uc;	/* Store it */
		}
		else
		{
			if( uc != 0xFFFF )
			{
				return FALSE;		/* Check filler */
			}
		}
	} while( ++s < 13 );

	/* Read all character in the entry */

	if( dir[LDIR_Ord] & 0x40 )
	{						/* Put terminator if it is the last LFN part */
		if( i >= _MAX_LFN )
		{
			return FALSE;	/* Buffer overflow? */
		}

		lfnbuf[i] = 0;
	}

	return TRUE;
}

	#if !_FS_READONLY
static void fit_lfn
			(
				const WCHAR *lfnbuf,	/* Pointer to the LFN buffer */
				BYTE		*dir,		/* Pointer to the directory entry */
				BYTE		ord,		/* LFN order (1-20) */
				BYTE		sum			/* SFN sum */
			)
{
	int		i, s;
	WCHAR	wc;

	dir[LDIR_Chksum] = sum;				/* Set check sum */
	dir[LDIR_Attr] = AM_LFN;			/* Set attribute. LFN entry */
	dir[LDIR_Type] = 0;
	ST_WORD( dir + LDIR_FstClusLO, 0 );

	i = ( ord - 1 ) * 13;				/* Get offset in the LFN buffer */
	s = wc = 0;
	do
	{
		if( wc != 0xFFFF )
		{
			wc = lfnbuf[i++];			/* Get an effective char */
		}

		ST_WORD( dir + LfnOfs[s], wc ); /* Put it */
		if( !wc )
		{
			wc = 0xFFFF;				/* Padding chars following last char */
		}
	} while( ++s < 13 );
	if( wc == 0xFFFF || !lfnbuf[i] )
	{
		ord |= 0x40;					/* Bottom LFN part is the start of LFN sequence */
	}

	dir[LDIR_Ord] = ord;				/* Set the LFN order */
}

	#endif
#endif

/*-----------------------------------------------------------------------*/

/* Create numbered name                                                  */

/*-----------------------------------------------------------------------*/
#if _USE_LFN
void gen_numname
	(
		BYTE		*dst,	/* Pointer to genartated SFN */
		const BYTE	*src,	/* Pointer to source SFN to be modified */
		const WCHAR *lfn,	/* Pointer to LFN */
		WORD		num		/* Sequense number */
	)
{
	char	ns[8];
	int		i, j;

	mem_cpy( dst, src, 11 );

	if( num > 5 )
	{	/* On many collisions, generate a hash number instead of sequencial number */
		do
		{
			num = ( num >> 1 ) + ( num << 15 ) + ( WORD ) * lfn++;
		} while( *lfn );
	}

	/* itoa */
	i = 7;
	do
	{
		ns[i--] = ( num % 10 ) + '0';
		num /= 10;
	} while( num );
	ns[i] = '~';

	/* Append the number */
	for( j = 0; j < i && dst[j] != ' '; j++ )
	{
		if( IsDBCS1(dst[j]) )
		{
			if( j == i - 1 )
			{
				break;
			}

			j++;
		}
	}

	do
	{
		dst[j++] = ( i < 8 ) ? ns[i++] : ' ';
	} while( j < 8 );
}

#endif

/*-----------------------------------------------------------------------*/

/* Calculate sum of an SFN                                               */

/*-----------------------------------------------------------------------*/
#if _USE_LFN
static BYTE sum_sfn( const BYTE *dir /* Ptr to directory entry */ )
{
	BYTE	sum = 0;
	int		n = 11;

	do
	{
		sum = ( sum >> 1 ) + ( sum << 7 ) +*dir++;
	} while( --n );
	return sum;
}

#endif

/*-----------------------------------------------------------------------*/

/* Directory handling - Find an object in the directory                  */

/*-----------------------------------------------------------------------*/
static FRESULT dir_find( DIR *dj /* Pointer to the directory object linked to the file name */ )
{
	FRESULT res;
	BYTE	c, *dir;
	#if _USE_LFN
	BYTE	a, ord, sum;
	#endif
	res = dir_seek( dj, 0 );			/* Rewind directory object */
	if( res != FR_OK )
	{
		return res;
	}

	#if _USE_LFN
	ord = sum = 0xFF;
	#endif
	do
	{
		res = move_window( dj->fs, dj->sect );
		if( res != FR_OK )
		{
			break;
		}

		dir = dj->dir;					/* Ptr to the directory entry of current index */
		c = dir[DIR_Name];
		if( c == 0 )
		{
			res = FR_NO_FILE;
			break;
		}								/* Reached to end of table */

		#if _USE_LFN					/* LFN configuration */
		a = dir[DIR_Attr] & AM_MASK;
		if( c == 0xE5 || ((a & AM_VOL) && a != AM_LFN) )
		{								/* An entry without valid data */
			ord = 0xFF;
		}
		else
		{
			if( a == AM_LFN )
			{							/* An LFN entry is found */
				if( dj->lfn )
				{
					if( c & 0x40 )
					{					/* Is it start of LFN sequence? */
						sum = dir[LDIR_Chksum];
						c &= 0xBF;
						ord = c;		/* LFN start order */
						dj->lfn_idx = dj->index;
					}

					/* Check validity of the LFN entry and compare it with given name */
					ord = ( c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dj->lfn, dir) ) ? ord - 1 : 0xFF;
				}
			}
			else
			{							/* An SFN entry is found */
				if( !ord && sum == sum_sfn(dir) )
				{
					break;				/* LFN matched? */
				}

				ord = 0xFF;
				dj->lfn_idx = 0xFFFF;	/* Reset LFN sequence */
				if( !(dj->fn[NS] & NS_LOSS) && !mem_cmp(dir, dj->fn, 11) )
				{
					break;				/* SFN matched? */
				}
			}
		}

		#else /* Non LFN configuration */
		if( !(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11) )
		{	/* Is it a valid entry? */
			break;
		}

		#endif
		res = dir_next( dj, FALSE );	/* Next entry */
	} while( res == FR_OK );

	return res;
}

/*-----------------------------------------------------------------------*/

/* Read an object from the directory                                     */

/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1
static FRESULT dir_read( DIR *dj /* Pointer to the directory object that pointing the entry to be read */ )
{
	FRESULT res;
	BYTE	c, *dir;
		#if _USE_LFN
	BYTE	a, ord = 0xFF, sum = 0xFF;
		#endif
	res = FR_NO_FILE;
	while( dj->sect )
	{
		res = move_window( dj->fs, dj->sect );
		if( res != FR_OK )
		{
			break;
		}

		dir = dj->dir;					/* Ptr to the directory entry of current index */
		c = dir[DIR_Name];
		if( c == 0 )
		{
			res = FR_NO_FILE;
			break;
		}					/* Reached to end of table */

			#if _USE_LFN	/* LFN configuration */
		a = dir[DIR_Attr] & AM_MASK;
		if( c == 0xE5 || (!_FS_RPATH && c == '.') || ((a & AM_VOL) && a != AM_LFN) )
		{					/* An entry without valid data */
			ord = 0xFF;
		}
		else
		{
			if( a == AM_LFN )
			{				/* An LFN entry is found */
				if( c & 0x40 )
				{			/* Is it start of LFN sequence? */
					sum = dir[LDIR_Chksum];
					c &= 0xBF;
					ord = c;
					dj->lfn_idx = dj->index;
				}

				/* Check LFN validity and capture it */
				ord = ( c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dj->lfn, dir) ) ? ord - 1 : 0xFF;
			}
			else
			{				/* An SFN entry is found */
				if( ord || sum != sum_sfn(dir) )
				{			/* Is there a valid LFN? */
					dj->lfn_idx = 0xFFFF;	/* It has no LFN. */
				}

				break;
			}
		}

			#else /* Non LFN configuration */
		if( c != 0xE5 && (_FS_RPATH || c != '.') && !(dir[DIR_Attr] & AM_VOL) )
		{	/* Is it a valid entry? */
			break;
		}

			#endif
		res = dir_next( dj, FALSE );	/* Next entry */
		if( res != FR_OK )
		{
			break;
		}
	}

	if( res != FR_OK )
	{
		dj->sect = 0;
	}

	return res;
}

#endif

/*-----------------------------------------------------------------------*/

/* Register an object to the directory                                   */

/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static FRESULT dir_register
	(			/* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */
		DIR *dj /* Target directory with object name to be created */
	)
{
	FRESULT res;
	BYTE	c, *dir;
		#if _USE_LFN			/* LFN configuration */
	WORD	n, ne, is;
	BYTE	sn[12], *fn, sum;
	WCHAR	*lfn;

	fn = dj->fn;
	lfn = dj->lfn;
	mem_cpy( sn, fn, 12 );

	if( _FS_RPATH && (sn[NS] & NS_DOT) )
	{
		return FR_INVALID_NAME; /* Cannot create dot entry */
	}

	if( sn[NS] & NS_LOSS )
	{					/* When LFN is out of 8.3 format, generate a numbered name */
		fn[NS] = 0;
		dj->lfn = NULL; /* Find only SFN */
		for( n = 1; n < 100; n++ )
		{
			gen_numname( fn, sn, lfn, n );	/* Generate a numbered name */
			res = dir_find( dj );			/* Check if the name collides with existing SFN */
			if( res != FR_OK )
			{
				break;
			}
		}

		if( n == 100 )
		{
			return FR_DENIED;				/* Abort if too many collisions */
		}

		if( res != FR_NO_FILE )
		{
			return res;						/* Abort if the result is other than 'not collided' */
		}

		fn[NS] = sn[NS];
		dj->lfn = lfn;
	}

	if( sn[NS] & NS_LFN )
	{					/* When LFN is to be created, reserve reserve an SFN + LFN entries. */
		for( ne = 0; lfn[ne]; ne++ );
		ne = ( ne + 25 ) / 13;
	}
	else
	{					/* Otherwise reserve only an SFN entry. */
		ne = 1;
	}

	/* Reserve contiguous entries */
	res = dir_seek( dj, 0 );
	if( res != FR_OK )
	{
		return res;
	}

	n = is = 0;
	do
	{
		res = move_window( dj->fs, dj->sect );
		if( res != FR_OK )
		{
			break;
		}

		c = *dj->dir;	/* Check the entry status */
		if( c == 0xE5 || c == 0 )
		{				/* Is it a blank entry? */
			if( n == 0 )
			{
				is = dj->index;		/* First index of the contigulus entry */
			}

			if( ++n == ne )
			{
				break;				/* A contiguous entry that requiered count is found */
			}
		}
		else
		{
			n = 0;					/* Not a blank entry. Restart to search */
		}

		res = dir_next( dj, TRUE ); /* Next entry with table streach */
	} while( res == FR_OK );

	if( res == FR_OK && ne > 1 )
	{	/* Initialize LFN entry if needed */
		res = dir_seek( dj, is );
		if( res == FR_OK )
		{
			sum = sum_sfn( dj->fn );	/* Sum of the SFN tied to the LFN */
			ne--;
			do
			{	/* Store LFN entries in bottom first */
				res = move_window( dj->fs, dj->sect );
				if( res != FR_OK )
				{
					break;
				}

				fit_lfn( dj->lfn, dj->dir, (BYTE) ne, sum );
				dj->fs->wflag = 1;
				res = dir_next( dj, FALSE );	/* Next entry */
			} while( res == FR_OK && --ne );
		}
	}

		#else /* Non LFN configuration */
	res = dir_seek( dj, 0 );
	if( res == FR_OK )
	{
		do
		{				/* Find a blank entry for the SFN */
			res = move_window( dj->fs, dj->sect );
			if( res != FR_OK )
			{
				break;
			}

			c = *dj->dir;
			if( c == 0xE5 || c == 0 )
			{
				break;	/* Is it a blank entry? */
			}

			res = dir_next( dj, TRUE ); /* Next entry with table streach */
		} while( res == FR_OK );
	}

		#endif
	if( res == FR_OK )
	{	/* Initialize the SFN entry */
		res = move_window( dj->fs, dj->sect );
		if( res == FR_OK )
		{
			dir = dj->dir;
			mem_set( dir, 0, 32 );		/* Clean the entry */
			mem_cpy( dir, dj->fn, 11 ); /* Put SFN */
			dir[DIR_NTres] = *( dj->fn + NS ) & ( NS_BODY | NS_EXT );	/* Put NT flag */
			dj->fs->wflag = 1;
		}
	}

	return res;
}

#endif /* !_FS_READONLY */

/*-----------------------------------------------------------------------*/

/* Remove an object from the directory                                   */

/*-----------------------------------------------------------------------*/
#if !_FS_READONLY && !_FS_MINIMIZE
static FRESULT dir_remove
	(			/* FR_OK: Successful, FR_DISK_ERR: A disk error */
		DIR *dj /* Directory object pointing the entry to be removed */
	)
{
	FRESULT res;
		#if _USE_LFN	/* LFN configuration */
	WORD	i;

	i = dj->index;		/* SFN index */
	res = dir_seek( dj, (WORD) ((dj->lfn_idx == 0xFFFF) ? i : dj->lfn_idx) );	/* Goto the SFN or top of the LFN entries */
	if( res == FR_OK )
	{
		do
		{
			res = move_window( dj->fs, dj->sect );
			if( res != FR_OK )
			{
				break;
			}

			*dj->dir = 0xE5;				/* Mark the entry "deleted" */
			dj->fs->wflag = 1;
			if( dj->index >= i )
			{
				break;						/* When reached SFN, all entries of the object has been deleted. */
			}

			res = dir_next( dj, FALSE );	/* Next entry */
		} while( res == FR_OK );
		if( res == FR_NO_FILE )
		{
			res = FR_INT_ERR;
		}
	}

		#else /* Non LFN configuration */
	res = dir_seek( dj, dj->index );
	if( res == FR_OK )
	{
		res = move_window( dj->fs, dj->sect );
		if( res == FR_OK )
		{
			*dj->dir = 0xE5;				/* Mark the entry "deleted" */
			dj->fs->wflag = 1;
		}
	}

		#endif
	return res;
}

#endif /* !_FS_READONLY */

/*-----------------------------------------------------------------------*/

/* Pick a segment and create the object name in directory form           */

/*-----------------------------------------------------------------------*/
static FRESULT create_name
			(
				DIR			*dj,	/* Pointer to the directory object */
				const XCHAR **path	/* Pointer to pointer to the segment in the path string */
			)
{
	#ifdef _EXCVT

	static const BYTE	cvt[] = _EXCVT;
	#endif
	#if _USE_LFN					/* LFN configuration */
	BYTE				b, cf;
	WCHAR				w, *lfn;
	int					i, ni, si, di;
	const XCHAR			*p;

	/* Create LFN in Unicode */
	si = di = 0;
	p = *path;
	lfn = dj->lfn;
	for( ;; )
	{
		w = p[si++];				/* Get a character */
		if( w < ' ' || w == '/' || w == '\\' )
		{
			break;					/* Break on end of segment */
		}

		if( di >= _MAX_LFN )
		{							/* Reject too long name */
			return FR_INVALID_NAME;
		}

			#if !_LFN_UNICODE
		w &= 0xFF;
		if( IsDBCS1(w) )
		{							/* If it is a DBC 1st byte */
			b = p[si++];			/* Get 2nd byte */
			if( !IsDBCS2(b) )
			{						/* Reject invalid code for DBC */
				return FR_INVALID_NAME;
			}

			w = ( w << 8 ) + b;
		}

		w = ff_convert( w, 1 );		/* Convert OEM to Unicode */
		if( !w )
		{
			return FR_INVALID_NAME; /* Reject invalid code */
		}

			#endif
		if( w < 0x80 && chk_chr("\"*:<>\?|\x7F", w) )
		{				/* Reject illegal chars for LFN */
			return FR_INVALID_NAME;
		}

		lfn[di++] = w;	/* Store the Unicode char */
	}

	*path = &p[si];		/* Rerurn pointer to the next segment */
	cf = ( w < ' ' ) ? NS_LAST : 0; /* Set last segment flag if end of path */
		#if _FS_RPATH
	if( (di == 1 && lfn[di - 1] == '.') || /* Is this a dot entry? */ (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.') )
	{
		lfn[di] = 0;
		for( i = 0; i < 11; i++ )
		{
			dj->fn[i] = ( i < di ) ? '.' : ' ';
		}

		dj->fn[i] = cf | NS_DOT;	/* This is a dot entry */
		return FR_OK;
	}

		#endif
	while( di )
	{	/* Strip trailing spaces and dots */
		w = lfn[di - 1];
		if( w != ' ' && w != '.' )
		{
			break;
		}

		di--;
	}

	if( !di )
	{
		return FR_INVALID_NAME;			/* Reject null string */
	}

	lfn[di] = 0;						/* LFN is created */

	/* Create SFN in directory form */
	mem_set( dj->fn, ' ', 11 );
	for( si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++ );

	/* Strip leading spaces and dots */
	if( si )
	{
		cf |= NS_LOSS | NS_LFN;
	}

	while( di && lfn[di - 1] != '.' )
	{
		di--;							/* Find extension (di<=si: no extension) */
	}

	b = i = 0;
	ni = 8;
	for( ;; )
	{
		w = lfn[si++];					/* Get an LFN char */
		if( !w )
		{
			break;						/* Break on enf of the LFN */
		}

		if( w == ' ' || (w == '.' && si != di) )
		{								/* Remove spaces and dots */
			cf |= NS_LOSS | NS_LFN;
			continue;
		}

		if( i >= ni || si == di )
		{								/* Extension or end of SFN */
			if( ni == 11 )
			{							/* Long extension */
				cf |= NS_LOSS | NS_LFN;
				break;
			}

			if( si != di )
			{
				cf |= NS_LOSS | NS_LFN; /* Out of 8.3 format */
			}

			if( si > di )
			{
				break;					/* No extension */
			}

			si = di;
			i = 8;
			ni = 11;					/* Enter extension section */
			b <<= 2;
			continue;
		}

		if( w >= 0x80 )
		{	/* Non ASCII char */
				#ifdef _EXCVT
			w = ff_convert( w, 0 );					/* Unicode -> OEM code */
			if( w )
			{
				w = cvt[w - 0x80];					/* Convert extended char to upper (SBCS) */
			}

				#else
			w = ff_convert( ff_wtoupper(w), 0 );	/* Upper converted Unicode -> OEM code */
				#endif
			cf |= NS_LFN;				/* Force create LFN entry */
		}

		if( _DF1S && w >= 0x100 )
		{								/* Double byte char */
			if( i >= ni - 1 )
			{
				cf |= NS_LOSS | NS_LFN;
				i = ni;
				continue;
			}

			dj->fn[i++] = ( BYTE ) ( w >> 8 );
		}
		else
		{								/* Single byte char */
			if( !w || chk_chr("+,;[=]", w) )
			{							/* Replace illegal chars for SFN */
				w = '_';
				cf |= NS_LOSS | NS_LFN; /* Lossy conversion */
			}
			else
			{
				if( IsUpper(w) )
				{						/* ASCII large capital */
					b |= 2;
				}
				else
				{
					if( IsLower(w) )
					{					/* ASCII small capital */
						b |= 1;
						w -= 0x20;
					}
				}
			}
		}

		dj->fn[i++] = ( BYTE ) w;
	}

	if( dj->fn[0] == 0xE5 )
	{
		dj->fn[0] = 0x05;				/* If the first char collides with deleted mark, replace it with 0x05 */
	}

	if( ni == 8 )
	{
		b <<= 2;
	}

	if( (b & 0x0C) == 0x0C || (b & 0x03) == 0x03 )
	{						/* Create LFN entry when there are composite capitals */
		cf |= NS_LFN;
	}

	if( !(cf & NS_LFN) )
	{						/* When LFN is in 8.3 format without extended char, NT flags are created */
		if( (b & 0x03) == 0x01 )
		{
			cf |= NS_EXT;	/* NT flag (Extension has only small capital) */
		}

		if( (b & 0x0C) == 0x04 )
		{
			cf |= NS_BODY;	/* NT flag (Filename has only small capital) */
		}
	}

	dj->fn[NS] = cf;		/* SFN is created */

	return FR_OK;

	#else /* Non-LFN configuration */
	BYTE		b, c, d, *sfn;
	int			ni, si, i;
	const char	*p;

	/* Create file name in directory form */
	sfn = dj->fn;
	mem_set( sfn, ' ', 11 );
	si = i = b = 0;
	ni = 8;
	p = *path;
		#if _FS_RPATH
	if( p[si] == '.' )
	{						/* Is this a dot entry? */
		for( ;; )
		{
			c = p[si++];
			if( c != '.' || si >= 3 )
			{
				break;
			}

			sfn[i++] = c;
		}

		if( c != '/' && c != '\\' && c > ' ' )
		{
			return FR_INVALID_NAME;
		}

		*path = &p[si];		/* Rerurn pointer to the next segment */
		sfn[NS] = ( c <= ' ' ) ? NS_LAST | NS_DOT : NS_DOT; /* Set last segment flag if end of path */
		return FR_OK;
	}

		#endif
	for( ;; )
	{
		c = p[si++];
		if( c <= ' ' || c == '/' || c == '\\' )
		{
			break;					/* Break on end of segment */
		}

		if( c == '.' || i >= ni )
		{
			if( ni != 8 || c != '.' )
			{
				return FR_INVALID_NAME;
			}

			i = 8;
			ni = 11;
			b <<= 2;
			continue;
		}

		if( c >= 0x80 )
		{							/* Extended char */
				#ifdef _EXCVT
			c = cvt[c - 0x80];		/* Convert extend char (SBCS) */
				#else
			b |= 3;					/* Eliminate NT flag if ext char is exist */
					#if !_DF1S		/* ASCII only cfg */
			return FR_INVALID_NAME;
					#endif
				#endif
		}

		if( IsDBCS1(c) )
		{							/* DBC 1st byte? */
			d = p[si++];			/* Get 2nd byte */
			if( !IsDBCS2(d) || i >= ni - 1 )
			{						/* Reject invalid DBC */
				return FR_INVALID_NAME;
			}

			sfn[i++] = c;
			sfn[i++] = d;
		}
		else
		{							/* Single byte code */
			if( chk_chr(" \"*+,[=]|\x7F", c) )
			{						/* Reject illegal chrs for SFN */
				return FR_INVALID_NAME;
			}

			if( IsUpper(c) )
			{						/* ASCII large capital? */
				b |= 2;
			}
			else
			{
				if( IsLower(c) )
				{					/* ASCII small capital? */
					b |= 1;
					c -= 0x20;
				}
			}

			sfn[i++] = c;
		}
	}

	*path = &p[si];					/* Return pointer to the next segment */
	c = ( c <= ' ' ) ? NS_LAST : 0; /* Set last segment flag if end of path */

	if( !i )
	{
		return FR_INVALID_NAME;		/* Reject null string */
	}

	if( sfn[0] == 0xE5 )
	{
		sfn[0] = 0x05;				/* When first char collides with 0xE5, replace it with 0x05 */
	}

	if( ni == 8 )
	{
		b <<= 2;
	}

	if( (b & 0x03) == 0x01 )
	{
		c |= NS_EXT;				/* NT flag (Extension has only small capital) */
	}

	if( (b & 0x0C) == 0x04 )
	{
		c |= NS_BODY;				/* NT flag (Filename has only small capital) */
	}

	sfn[NS] = c;					/* Store NT flag, File name is created */

	return FR_OK;
	#endif
}

/*-----------------------------------------------------------------------*/

/* Get file information from directory entry                             */

/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1
static void get_fileinfo
	(					/* No return code */
		DIR *dj,		/* Pointer to the directory object */
		FILINFO *fno	/* Pointer to the file information to be filled */
	)
{
	int		i;
	BYTE	c, nt, *dir;
	char	*p;

	p = fno->fname;
	if( dj->sect )
	{
		dir = dj->dir;
		nt = dir[DIR_NTres];			/* NT flag */
		for( i = 0; i < 8; i++ )
		{								/* Copy name body */
			c = dir[i];
			if( c == ' ' )
			{
				break;
			}

			if( c == 0x05 )
			{
				c = 0xE5;
			}

			if( _USE_LFN && (nt & NS_BODY) && IsUpper(c) )
			{
				c += 0x20;
			}

			*p++ = c;
		}

		if( dir[8] != ' ' )
		{								/* Copy name extension */
			*p++ = '.';
			for( i = 8; i < 11; i++ )
			{
				c = dir[i];
				if( c == ' ' )
				{
					break;
				}

				if( _USE_LFN && (nt & NS_EXT) && IsUpper(c) )
				{
					c += 0x20;
				}

				*p++ = c;
			}
		}

		fno->fattrib = dir[DIR_Attr];	/* Attribute */
		fno->fsize = LD_DWORD( dir + DIR_FileSize );	/* Size */
		fno->fdate = LD_WORD( dir + DIR_WrtDate );		/* Date */
		fno->ftime = LD_WORD( dir + DIR_WrtTime );		/* Time */
	}

	*p = 0;

		#if _USE_LFN
	if( fno->lfname )
	{
		XCHAR	*tp = fno->lfname;
		WCHAR	w, *lfn;

		i = 0;
		if( dj->sect && dj->lfn_idx != 0xFFFF )
		{		/* Get LFN if available */
			lfn = dj->lfn;
			while( (w = *lfn++) != 0 )
			{	/* Get an LFN char */
						#if !_LFN_UNICODE
				w = ff_convert( w, 0 ); /* Unicode -> OEM conversion */
				if( !w )
				{
					i = 0;
					break;
				}						/* Could not convert, no LFN */

				if( _DF1S && w >= 0x100 )
				{						/* Put 1st byte if it is a DBC */
					tp[i++] = ( XCHAR ) ( w >> 8 );
				}

						#endif
				if( i >= fno->lfsize - 1 )
				{
					i = 0;
					break;
				}						/* Buffer overrun, no LFN */

				tp[i++] = ( XCHAR ) w;
			}
		}

		tp[i] = 0;						/* Terminator */
	}

		#endif
}

#endif /* _FS_MINIMIZE <= 1 */

/*-----------------------------------------------------------------------*/

/* Follow a file path                                                    */

/*-----------------------------------------------------------------------*/
static FRESULT follow_path
	(						/* FR_OK(0): successful, !=0: error code */
		DIR *dj,			/* Directory object to return last directory and found object */
		const XCHAR *path	/* Full-path string to find a file or directory */
	)
{
	FRESULT res;
	BYTE	*dir, last;

	while( !_USE_LFN && *path == ' ' )
	{
		path++;						/* Skip leading spaces */
	}

	#if _FS_RPATH
	if( *path == '/' || *path == '\\' )
	{								/* There is a heading separator */
		path++;
		dj->sclust = 0;				/* Strip it and start from the root dir */
	}
	else
	{								/* No heading saparator */
		dj->sclust = dj->fs->cdir;	/* Start from the current dir */
	}

	#else
	if( *path == '/' || *path == '\\' )
	{				/* Strip heading separator if exist */
		path++;
	}

	dj->sclust = 0; /* Start from the root dir */
	#endif
	if( (UINT) * path < ' ' )
	{				/* Null path means the start directory itself */
		res = dir_seek( dj, 0 );
		dj->dir = NULL;
	}
	else
	{				/* Follow path */
		for( ;; )
		{
			res = create_name( dj, &path ); /* Get a segment */
			if( res != FR_OK )
			{
				break;
			}

			res = dir_find( dj );			/* Find it */
			last = *( dj->fn + NS ) & NS_LAST;
			if( res != FR_OK )
			{				/* Could not find the object */
				if( res == FR_NO_FILE && !last )
				{
					res = FR_NO_PATH;
				}

				break;
			}

			if( last )
			{
				break;		/* Last segment match. Function completed. */
			}

			dir = dj->dir;	/* There is next segment. Follow the sub directory */
			if( !(dir[DIR_Attr] & AM_DIR) )
			{				/* Cannot follow because it is a file */
				res = FR_NO_PATH;
				break;
			}

			dj->sclust = ( (DWORD) LD_WORD(dir + DIR_FstClusHI) << 16 ) | LD_WORD( dir + DIR_FstClusLO );
		}
	}

	return res;
}

/*-----------------------------------------------------------------------*/

/* Load boot record and check if it is an FAT boot record                */

/*-----------------------------------------------------------------------*/
static BYTE check_fs
	(				/* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record, 3:Error */
		FATFS *fs,	/* File system object */
		DWORD sect	/* Sector# (lba) to check if it is an FAT boot record or not */
	)
{
	if( disk_read(fs->drive, fs->win, sect, 1) != RES_OK )
	{	/* Load boot record */
		return 3;
	}

	if( LD_WORD(&fs->win[BS_55AA]) != 0xAA55 )
	{	/* Check record signature (always placed at offset 510 even if the sector size is >512) */
		return 2;
	}

	if( (LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146 )
	{	/* Check "FAT" string */
		return 0;
	}

	if( (LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146 )
	{
		return 0;
	}

	return 1;
}

/*-----------------------------------------------------------------------*/

/* Make sure that the file system is valid                               */

/*-----------------------------------------------------------------------*/
FRESULT chk_mounted
	(						/* FR_OK(0): successful, !=0: any error occured */
		const XCHAR **path, /* Pointer to pointer to the path name (drive number) */
		FATFS **rfs,		/* Pointer to pointer to the found file system object */
		BYTE chk_wp			/* !=0: Check media write protection for write access */
	)
{
	BYTE		fmt, *tbl;
	UINT		vol;
	DSTATUS		stat;
	DWORD		bsect, fsize, tsect, mclst;
	const XCHAR *p = *path;
	FATFS		*fs;

	/* Get logical drive number from the path name */
	vol = p[0] - '0';			/* Is there a drive number? */
	if( vol <= 9 && p[1] == ':' )
	{							/* Found a drive number, get and strip it */
		p += 2;
		*path = p;				/* Return pointer to the path name */
	}
	else
	{							/* No drive number is given */
		#if _FS_RPATH
		vol = Drive;			/* Use current drive */
		#else
		vol = 0;				/* Use drive 0 */
		#endif
	}

	/* Check if the logical drive is valid or not */
	if( vol >= _DRIVES )
	{							/* Is the drive number valid? */
		return FR_INVALID_DRIVE;
	}

	*rfs = fs = FatFs[vol];		/* Returen pointer to the corresponding file system object */
	if( !fs )
	{
		return FR_NOT_ENABLED;	/* Is the file system object available? */
	}

	ENTER_FF( fs );				/* Lock file system */

	if( fs->fs_type )
	{						/* If the logical drive has been mounted */
		stat = disk_status( fs->drive );
		if( !(stat & STA_NOINIT) )
		{					/* and the physical drive is kept initialized (has not been changed), */
			#if !_FS_READONLY
			if( chk_wp && (stat & STA_PROTECT) )
			{				/* Check write protection if needed */
				return FR_WRITE_PROTECTED;
			}

			#endif
			return FR_OK;	/* The file system object is valid */
		}
	}

	/* The logical drive must be mounted. Following code attempts to mount the volume */
	fs->fs_type = 0;		/* Clear the file system object */
	fs->drive = ( BYTE ) LD2PD( vol );		/* Bind the logical drive and a physical drive */
	stat = disk_initialize( fs->drive );	/* Initialize low level disk I/O layer */
	if( stat & STA_NOINIT )
	{					/* Check if the drive is ready */
		return FR_NOT_READY;
	}

	#if _MAX_SS != 512	/* Get disk sector size if needed */
	if( disk_ioctl(fs->drive, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS )
	{
		return FR_NO_FILESYSTEM;
	}

	#endif
	#if !_FS_READONLY
	if( chk_wp && (stat & STA_PROTECT) )
	{					/* Check disk write protection if needed */
		return FR_WRITE_PROTECTED;
	}

	#endif

	/* Search FAT partition on the drive */
	fmt = check_fs( fs, bsect = 0 );	/* Check sector 0 as an SFD format */
	if( fmt == 1 )
	{	/* Not an FAT boot record, it may be patitioned */
		/* Check a partition listed in top of the partition table */
		tbl = &fs->win[MBR_Table + LD2PT( vol ) * 16];	/* Partition table */
		if( tbl[4] )
		{	/* Is the partition existing? */
			bsect = LD_DWORD( &tbl[8] );	/* Partition offset in LBA */
			fmt = check_fs( fs, bsect );	/* Check the partition */
		}
	}

	if( fmt == 3 )
	{
		return FR_DISK_ERR;
	}

	if( fmt || LD_WORD(fs->win + BPB_BytsPerSec) != SS(fs) )
	{	/* No valid FAT patition is found */
		return FR_NO_FILESYSTEM;
	}

	/* Initialize the file system object */
	fsize = LD_WORD( fs->win + BPB_FATSz16 );					/* Number of sectors per FAT */
	if( !fsize )
	{
		fsize = LD_DWORD( fs->win + BPB_FATSz32 );
	}

	fs->sects_fat = fsize;
	fs->n_fats = fs->win[BPB_NumFATs];							/* Number of FAT copies */
	fsize *= fs->n_fats;										/* (Number of sectors in FAT area) */
	fs->fatbase = bsect + LD_WORD( fs->win + BPB_RsvdSecCnt );	/* FAT start sector (lba) */
	fs->csize = fs->win[BPB_SecPerClus];						/* Number of sectors per cluster */
	fs->n_rootdir = LD_WORD( fs->win + BPB_RootEntCnt );		/* Nmuber of root directory entries */
	tsect = LD_WORD( fs->win + BPB_TotSec16 );					/* Number of sectors on the volume */
	if( !tsect )
	{
		tsect = LD_DWORD( fs->win + BPB_TotSec32 );
	}

	fs->max_clust = mclst =
		(
			tsect /* Last cluster# + 1 (Number of clusters + 2) */ -
			LD_WORD(fs->win + BPB_RsvdSecCnt) -
			fsize -
			fs->n_rootdir /
			(SS(fs) / 32)
		) /
		fs->csize +
		2;

	fmt = FS_FAT12;		/* Determine the FAT sub type */
	if( mclst >= 0xFF7 )
	{
		fmt = FS_FAT16; /* Number of clusters >= 0xFF5 */
	}

	if( mclst >= 0xFFF7 )
	{
		fmt = FS_FAT32; /* Number of clusters >= 0xFFF5 */
	}

	if( fmt == FS_FAT32 )
	{
		fs->dirbase = LD_DWORD( fs->win + BPB_RootClus );					/* Root directory start cluster */
	}
	else
	{
		fs->dirbase = fs->fatbase + fsize;									/* Root directory start sector (lba) */
	}

	fs->database = fs->fatbase + fsize + fs->n_rootdir / ( SS(fs) / 32 );	/* Data start sector (lba) */

	#if !_FS_READONLY

	/* Initialize allocation information */
	fs->free_clust = 0xFFFFFFFF;
	fs->wflag = 0;

	/* Get fsinfo if needed */
	if( fmt == FS_FAT32 )
	{
		fs->fsi_flag = 0;
		fs->fsi_sector = bsect + LD_WORD( fs->win + BPB_FSInfo );
		if
		(
			disk_read(fs->drive, fs->win, fs->fsi_sector, 1) == RES_OK &&
			LD_WORD(fs->win + BS_55AA) == 0xAA55 &&
			LD_DWORD(fs->win + FSI_LeadSig) == 0x41615252 &&
			LD_DWORD(fs->win + FSI_StrucSig) == 0x61417272
		)
		{
			fs->last_clust = LD_DWORD( fs->win + FSI_Nxt_Free );
			fs->free_clust = LD_DWORD( fs->win + FSI_Free_Count );
		}
	}

	#endif
	fs->fs_type = fmt;	/* FAT sub-type */
	fs->winsect = 0;	/* Invalidate sector cache */
	#if _FS_RPATH
	fs->cdir = 0;		/* Current directory (root dir) */
	#endif
	fs->id = ++Fsid;	/* File system mount ID */

	return FR_OK;
}

/*-----------------------------------------------------------------------*/

/* Check if the file/dir object is valid or not                          */

/*-----------------------------------------------------------------------*/
static FRESULT validate
	(				/* FR_OK(0): The object is valid, !=0: Invalid */
		FATFS *fs,	/* Pointer to the file system object */
		WORD id		/* Member id of the target object to be checked */
	)
{
	if( !fs || !fs->fs_type || fs->id != id )
	{
		return FR_INVALID_OBJECT;
	}

	ENTER_FF( fs ); /* Lock file system */

	if( disk_status(fs->drive) & STA_NOINIT )
	{
		return FR_NOT_READY;
	}

	return FR_OK;
}

/*--------------------------------------------------------------------------

   Public Functions

--------------------------------------------------------------------------*/

/*-----------------------------------------------------------------------*/

/* Mount/Unmount a Locical Drive                                         */

/*-----------------------------------------------------------------------*/
FRESULT f_mount
		(
			BYTE	vol,	/* Logical drive number to be mounted/unmounted */
			FATFS	*fs		/* Pointer to new file system object (NULL for unmount)*/
		)
{
	FATFS	*rfs;

	if( vol >= _DRIVES )
	{						/* Check if the drive number is valid */
		return FR_INVALID_DRIVE;
	}

	rfs = FatFs[vol];		/* Get current fs object */

	if( rfs )
	{
		#if _FS_REENTRANT	/* Discard sync object of the current volume */
		if( !ff_del_syncobj(rfs->sobj) )
		{
			return FR_INT_ERR;
		}

		#endif
		rfs->fs_type = 0;	/* Clear old fs object */
	}

	if( fs )
	{
		fs->fs_type = 0;	/* Clear new fs object */
		#if _FS_REENTRANT	/* Create sync object for the new volume */
		if( !ff_cre_syncobj(vol, &fs->sobj) )
		{
			return FR_INT_ERR;
		}

		#endif
	}

	FatFs[vol] = fs;		/* Register new fs object */

	return FR_OK;
}

/*-----------------------------------------------------------------------*/

/* Open or Create a File                                                 */

/*-----------------------------------------------------------------------*/
FRESULT f_open
		(
			FIL			*fp,	/* Pointer to the blank file object */
			const XCHAR *path,	/* Pointer to the file name */
			BYTE		mode	/* Access mode and file open mode flags */
		)
{
	FRESULT res;
	DIR		dj;
	NAMEBUF( sfn, lfn );

	BYTE	*dir;

	fp->fs = NULL;					/* Clear file object */
	#if !_FS_READONLY
	mode &= ( FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW );
	res = chk_mounted( &path, &dj.fs, (BYTE) (mode & (FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) );
	#else
	mode &= FA_READ;
	res = chk_mounted( &path, &dj.fs, 0 );
	#endif
	if( res != FR_OK )
	{
		LEAVE_FF( dj.fs, res );
	}

	INITBUF( dj, sfn, lfn );
	res = follow_path( &dj, path ); /* Follow the file path */

	#if !_FS_READONLY

	/* Create or Open a file */
	if( mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW) )
	{
		DWORD	ps, cl;

		if( res != FR_OK )
		{					/* No file, create new */
			if( res == FR_NO_FILE )
			{				/* There is no file to open, create a new entry */
				res = dir_register( &dj );
			}

			if( res != FR_OK )
			{
				LEAVE_FF( dj.fs, res );
			}

			mode |= FA_CREATE_ALWAYS;
			dir = dj.dir;	/* Created entry (SFN entry) */
		}
		else
		{					/* Any object is already existing */
			if( mode & FA_CREATE_NEW )
			{				/* Cannot create new */
				LEAVE_FF( dj.fs, FR_EXIST );
			}

			dir = dj.dir;
			if( !dir || (dir[DIR_Attr] & (AM_RDO | AM_DIR)) )
			{				/* Cannot overwrite it (R/O or DIR) */
				LEAVE_FF( dj.fs, FR_DENIED );
			}

			if( mode & FA_CREATE_ALWAYS )
			{				/* Resize it to zero on over write mode */
				cl = ( (DWORD) LD_WORD(dir + DIR_FstClusHI) << 16 ) | LD_WORD( dir + DIR_FstClusLO );	/* Get start cluster */
				ST_WORD( dir + DIR_FstClusHI, 0 );	/* cluster = 0 */
				ST_WORD( dir + DIR_FstClusLO, 0 );
				ST_DWORD( dir + DIR_FileSize, 0 );	/* size = 0 */
				dj.fs->wflag = 1;
				ps = dj.fs->winsect;				/* Remove the cluster chain */
				if( cl )
				{
					res = remove_chain( dj.fs, cl );
					if( res )
					{
						LEAVE_FF( dj.fs, res );
					}

					dj.fs->last_clust = cl - 1;		/* Reuse the cluster hole */
				}

				res = move_window( dj.fs, ps );
				if( res != FR_OK )
				{
					LEAVE_FF( dj.fs, res );
				}
			}
		}

		if( mode & FA_CREATE_ALWAYS )
		{
			dir[DIR_Attr] = 0;						/* Reset attribute */
			ps = get_fattime();
			ST_DWORD( dir + DIR_CrtTime, ps );		/* Created time */
			dj.fs->wflag = 1;
			mode |= FA__WRITTEN;					/* Set file changed flag */
		}
	}

	/* Open an existing file */
	else
	{
		#endif /* !_FS_READONLY */
		if( res != FR_OK )
		{
			LEAVE_FF( dj.fs, res );					/* Follow failed */
		}

		dir = dj.dir;
		if( !dir || (dir[DIR_Attr] & AM_DIR) )
		{	/* It is a directory */
			LEAVE_FF( dj.fs, FR_NO_FILE );
		}

		#if !_FS_READONLY
		if( (mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO) )
		{	/* R/O violation */
			LEAVE_FF( dj.fs, FR_DENIED );
		}
	}

	fp->dir_sect = dj.fs->winsect;				/* Pointer to the directory entry */
	fp->dir_ptr = dj.dir;
	#endif
	fp->flag = mode;							/* File access mode */
	fp->org_clust =								/* File start cluster */
	( (DWORD) LD_WORD(dir + DIR_FstClusHI) << 16 ) | LD_WORD( dir + DIR_FstClusLO );
	fp->fsize = LD_DWORD( dir + DIR_FileSize ); /* File size */
	fp->fptr = 0;
	fp->csect = 255;	/* File pointer */
	fp->dsect = 0;
	fp->fs = dj.fs;
	fp->id = dj.fs->id; /* Owner file system object of the file */

	LEAVE_FF( dj.fs, FR_OK );
}

/*-----------------------------------------------------------------------*/

/* Read File                                                             */

/*-----------------------------------------------------------------------*/
FRESULT f_read
		(
			FIL		*fp,	/* Pointer to the file object */
			void	*buff,	/* Pointer to data buffer */
			UINT	btr,	/* Number of bytes to read */
			UINT	*br		/* Pointer to number of bytes read */
		)
{
	FRESULT res;
	DWORD	clst, sect, remain;
	UINT	rcnt, cc;
	BYTE	*rbuff = buff;

	*br = 0;	/* Initialize bytes read */

	res = validate( fp->fs, fp->id );	/* Check validity of the object */
	if( res != FR_OK )
	{
		LEAVE_FF( fp->fs, res );
	}

	if( fp->flag & FA__ERROR )
	{	/* Check abort flag */
		LEAVE_FF( fp->fs, FR_INT_ERR );
	}

	if( !(fp->flag & FA_READ) )
	{	/* Check access mode */
		LEAVE_FF( fp->fs, FR_DENIED );
	}

	remain = fp->fsize - fp->fptr;
	if( btr > remain )
	{
		btr = ( UINT ) remain;				/* Truncate btr by remaining bytes */
	}

	for( ; btr; /* Repeat until all data transferred */ rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt )
	{
		if( (fp->fptr % SS(fp->fs)) == 0 )
		{									/* On the sector boundary? */
			if( fp->csect >= fp->fs->csize )
			{								/* On the cluster boundary? */
				clst = ( fp->fptr == 0 ) ?	/* On the top of the file? */
				fp->org_clust : get_fat( fp->fs, fp->curr_clust );
				if( clst <= 1 )
				{
					ABORT( fp->fs, FR_INT_ERR );
				}

				if( clst == 0xFFFFFFFF )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				fp->curr_clust = clst;		/* Update current cluster */
				fp->csect = 0;				/* Reset sector offset in the cluster */
			}

			sect = clust2sect( fp->fs, fp->curr_clust );	/* Get current sector */
			if( !sect )
			{
				ABORT( fp->fs, FR_INT_ERR );
			}

			sect += fp->csect;
			cc = btr / SS( fp->fs );						/* When remaining bytes >= sector size, */
			if( cc )
			{		/* Read maximum contiguous sectors directly */
				if( fp->csect + cc > fp->fs->csize )
				{	/* Clip at cluster boundary */
					cc = fp->fs->csize - fp->csect;
				}

				if( disk_read(fp->fs->drive, rbuff, sect, (BYTE) cc) != RES_OK )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				#if !_FS_READONLY && _FS_MINIMIZE <= 2
					#if _FS_TINY
				if( fp->fs->wflag && fp->fs->winsect - sect < cc )
				{	/* Replace one of the read sectors with cached data if it contains a dirty sector */
					mem_cpy( rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs) );
				}

					#else
				if( (fp->flag & FA__DIRTY) && fp->dsect - sect < cc )
				{	/* Replace one of the read sectors with cached data if it contains a dirty sector */
					mem_cpy( rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs) );
				}

					#endif
				#endif
				fp->csect += ( BYTE ) cc;	/* Next sector address in the cluster */
				rcnt = SS( fp->fs ) * cc;	/* Number of bytes transferred */
				continue;
			}

			#if !_FS_TINY
				#if !_FS_READONLY
			if( fp->flag & FA__DIRTY )
			{				/* Write sector I/O buffer if needed */
				if( disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				fp->flag &= ~FA__DIRTY;
			}

				#endif
			if( fp->dsect != sect )
			{				/* Fill sector buffer with file data */
				if( disk_read(fp->fs->drive, fp->buf, sect, 1) != RES_OK )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}
			}

			#endif
			fp->dsect = sect;
			fp->csect++;	/* Next sector address in the cluster */
		}

		rcnt = SS( fp->fs ) - ( fp->fptr % SS(fp->fs) );	/* Get partial sector data from sector buffer */
		if( rcnt > btr )
		{
			rcnt = btr;
		}

		#if _FS_TINY
		if( move_window(fp->fs, fp->dsect) )
		{	/* Move sector window */
			ABORT( fp->fs, FR_DISK_ERR );
		}

		mem_cpy( rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt );	/* Pick partial sector */
		#else
		mem_cpy( rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt );		/* Pick partial sector */
		#endif
	}

	LEAVE_FF( fp->fs, FR_OK );
}

#if !_FS_READONLY

/*-----------------------------------------------------------------------*/

/* Write File                                                            */

/*-----------------------------------------------------------------------*/
FRESULT f_write
		(
			FIL			*fp,	/* Pointer to the file object */
			const void	*buff,	/* Pointer to the data to be written */
			UINT		btw,	/* Number of bytes to write */
			UINT		*bw		/* Pointer to number of bytes written */
		)
{
	FRESULT		res;
	DWORD		clst, sect;
	UINT		wcnt, cc;
	const BYTE	*wbuff = buff;

	*bw = 0;	/* Initialize bytes written */

	res = validate( fp->fs, fp->id );	/* Check validity of the object */
	if( res != FR_OK )
	{
		LEAVE_FF( fp->fs, res );
	}

	if( fp->flag & FA__ERROR )
	{				/* Check abort flag */
		LEAVE_FF( fp->fs, FR_INT_ERR );
	}

	if( !(fp->flag & FA_WRITE) )
	{				/* Check access mode */
		LEAVE_FF( fp->fs, FR_DENIED );
	}

	if( fp->fsize + btw < fp->fsize )
	{
		btw = 0;	/* File size cannot reach 4GB */
	}

	for( ; btw; /* Repeat until all data transferred */ wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt )
	{
		if( (fp->fptr % SS(fp->fs)) == 0 )
		{			/* On the sector boundary? */
			if( fp->csect >= fp->fs->csize )
			{		/* On the cluster boundary? */
				if( fp->fptr == 0 )
				{	/* On the top of the file? */
					clst = fp->org_clust;	/* Follow from the origin */
					if( clst == 0 )
					{						/* When there is no cluster chain, */
						fp->org_clust = clst = create_chain( fp->fs, 0 );	/* Create a new cluster chain */
					}
				}
				else
				{	/* Middle or end of the file */
					clst = create_chain( fp->fs, fp->curr_clust );	/* Follow or streach cluster chain */
				}

				if( clst == 0 )
				{
					break;				/* Could not allocate a new cluster (disk full) */
				}

				if( clst == 1 )
				{
					ABORT( fp->fs, FR_INT_ERR );
				}

				if( clst == 0xFFFFFFFF )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				fp->curr_clust = clst;	/* Update current cluster */
				fp->csect = 0;			/* Reset sector address in the cluster */
			}

				#if _FS_TINY
			if( fp->fs->winsect == fp->dsect && move_window(fp->fs, 0) )
			{	/* Write back data buffer prior to following direct transfer */
				ABORT( fp->fs, FR_DISK_ERR );
			}

				#else
			if( fp->flag & FA__DIRTY )
			{	/* Write back data buffer prior to following direct transfer */
				if( disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				fp->flag &= ~FA__DIRTY;
			}

				#endif
			sect = clust2sect( fp->fs, fp->curr_clust );	/* Get current sector */
			if( !sect )
			{
				ABORT( fp->fs, FR_INT_ERR );
			}

			sect += fp->csect;
			cc = btw / SS( fp->fs );						/* When remaining bytes >= sector size, */
			if( cc )
			{		/* Write maximum contiguous sectors directly */
				if( fp->csect + cc > fp->fs->csize )
				{	/* Clip at cluster boundary */
					cc = fp->fs->csize - fp->csect;
				}

				if( disk_write(fp->fs->drive, wbuff, sect, (BYTE) cc) != RES_OK )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

					#if _FS_TINY
				if( fp->fs->winsect - sect < cc )
				{	/* Refill sector cache if it gets dirty by the direct write */
					mem_cpy( fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs) );
					fp->fs->wflag = 0;
				}

					#else
				if( fp->dsect - sect < cc )
				{	/* Refill sector cache if it gets dirty by the direct write */
					mem_cpy( fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs) );
					fp->flag &= ~FA__DIRTY;
				}

					#endif
				fp->csect += ( BYTE ) cc;	/* Next sector address in the cluster */
				wcnt = SS( fp->fs ) * cc;	/* Number of bytes transferred */
				continue;
			}

				#if _FS_TINY
			if( fp->fptr >= fp->fsize )
			{				/* Avoid silly buffer filling at growing edge */
				if( move_window(fp->fs, 0) )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				fp->fs->winsect = sect;
			}

				#else
			if( fp->dsect != sect )
			{				/* Fill sector buffer with file data */
				if( fp->fptr < fp->fsize && disk_read(fp->fs->drive, fp->buf, sect, 1) != RES_OK )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}
			}

				#endif
			fp->dsect = sect;
			fp->csect++;	/* Next sector address in the cluster */
		}

		wcnt = SS( fp->fs ) - ( fp->fptr % SS(fp->fs) );	/* Put partial sector into file I/O buffer */
		if( wcnt > btw )
		{
			wcnt = btw;
		}

			#if _FS_TINY
		if( move_window(fp->fs, fp->dsect) )
		{	/* Move sector window */
			ABORT( fp->fs, FR_DISK_ERR );
		}

		mem_cpy( &fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt );	/* Fit partial sector */
		fp->fs->wflag = 1;
			#else
		mem_cpy( &fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt );		/* Fit partial sector */
		fp->flag |= FA__DIRTY;
			#endif
	}

	if( fp->fptr > fp->fsize )
	{
		fp->fsize = fp->fptr;	/* Update file size if needed */
	}

	fp->flag |= FA__WRITTEN;	/* Set file changed flag */

	LEAVE_FF( fp->fs, FR_OK );
}

/*-----------------------------------------------------------------------*/

/* Synchronize the File Object                                           */

/*-----------------------------------------------------------------------*/
FRESULT f_sync( FIL *fp /* Pointer to the file object */ )
{
	FRESULT res;
	DWORD	tim;
	BYTE	*dir;

	res = validate( fp->fs, fp->id );	/* Check validity of the object */
	if( res == FR_OK )
	{
		if( fp->flag & FA__WRITTEN )
		{						/* Has the file been written? */
				#if !_FS_TINY	/* Write-back dirty buffer */
			if( fp->flag & FA__DIRTY )
			{
				if( disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK )
				{
					LEAVE_FF( fp->fs, FR_DISK_ERR );
				}

				fp->flag &= ~FA__DIRTY;
			}

				#endif

			/* Update the directory entry */
			res = move_window( fp->fs, fp->dir_sect );
			if( res == FR_OK )
			{
				dir = fp->dir_ptr;
				dir[DIR_Attr] |= AM_ARC;						/* Set archive bit */
				ST_DWORD( dir + DIR_FileSize, fp->fsize );		/* Update file size */
				ST_WORD( dir + DIR_FstClusLO, fp->org_clust );	/* Update start cluster */
				ST_WORD( dir + DIR_FstClusHI, fp->org_clust >> 16 );
				tim = get_fattime();	/* Updated time */
				ST_DWORD( dir + DIR_WrtTime, tim );
				fp->flag &= ~FA__WRITTEN;
				fp->fs->wflag = 1;
				res = sync( fp->fs );
			}
		}
	}

	LEAVE_FF( fp->fs, res );
}

#endif /* !_FS_READONLY */

/*-----------------------------------------------------------------------*/

/* Close File                                                            */

/*-----------------------------------------------------------------------*/
FRESULT f_close( FIL *fp /* Pointer to the file object to be closed */ )
{
	FRESULT res;

	#if _FS_READONLY
	res = validate( fp->fs, fp->id );
	if( res == FR_OK )
	{
		fp->fs = NULL;
	}

	LEAVE_FF( fp->fs, res );
	#else
	res = f_sync( fp );
	if( res == FR_OK )
	{
		fp->fs = NULL;
	}

	return res;
	#endif
}

/*-----------------------------------------------------------------------*/

/* Change Current Drive/Directory                                        */

/*-----------------------------------------------------------------------*/
#if _FS_RPATH
FRESULT f_chdrive( BYTE drv /* Drive number */ )
{
	if( drv >= _DRIVES )
	{
		return FR_INVALID_DRIVE;
	}

	Drive = drv;

	return FR_OK;
}

FRESULT f_chdir( const XCHAR *path /* Pointer to the directory path */ )
{
	FRESULT res;
	DIR		dj;
	NAMEBUF( sfn, lfn );

	BYTE	*dir;

	res = chk_mounted( &path, &dj.fs, 0 );
	if( res == FR_OK )
	{
		INITBUF( dj, sfn, lfn );
		res = follow_path( &dj, path ); /* Follow the file path */
		if( res == FR_OK )
		{					/* Follow completed */
			dir = dj.dir;	/* Pointer to the entry */
			if( !dir )
			{
				dj.fs->cdir = 0;		/* No entry (root dir) */
			}
			else
			{
				if( dir[DIR_Attr] & AM_DIR )
				{						/* Reached to the dir */
					dj.fs->cdir = ( (DWORD) LD_WORD(dir + DIR_FstClusHI) << 16 ) | LD_WORD( dir + DIR_FstClusLO );
				}
				else
				{
					res = FR_NO_PATH;	/* Could not reach the dir (it is a file) */
				}
			}
		}

		if( res == FR_NO_FILE )
		{
			res = FR_NO_PATH;
		}
	}

	LEAVE_FF( dj.fs, res );
}

#endif
#if _FS_MINIMIZE <= 2

/*-----------------------------------------------------------------------*/

/* Seek File R/W Pointer                                                 */

/*-----------------------------------------------------------------------*/
FRESULT f_lseek( FIL *fp, /* Pointer to the file object */ DWORD ofs /* File pointer from top of file */ )
{
	FRESULT res;
	DWORD	clst, bcs, nsect, ifptr;

	res = validate( fp->fs, fp->id );	/* Check validity of the object */
	if( res != FR_OK )
	{
		LEAVE_FF( fp->fs, res );
	}

	if( fp->flag & FA__ERROR )
	{					/* Check abort flag */
		LEAVE_FF( fp->fs, FR_INT_ERR );
	}

	if( ofs > fp->fsize /* In read-only mode, clip offset with the file size */
		#if !_FS_READONLY
	&& !(fp->flag & FA_WRITE)
		#endif
	)
	{
		ofs = fp->fsize;
	}

	ifptr = fp->fptr;
	fp->fptr = nsect = 0;
	fp->csect = 255;
	if( ofs > 0 )
	{
		bcs = ( DWORD ) fp->fs->csize * SS( fp->fs );	/* Cluster size (byte) */
		if( ifptr > 0 && (ofs - 1) / bcs >= (ifptr - 1) / bcs )
		{	/* When seek to same or following cluster, */
			fp->fptr = ( ifptr - 1 ) &~( bcs - 1 ); /* start from the current cluster */
			ofs -= fp->fptr;
			clst = fp->curr_clust;
		}
		else
		{	/* When seek to back cluster, */
			clst = fp->org_clust;	/* start from the first cluster */
				#if !_FS_READONLY
			if( clst == 0 )
			{						/* If no cluster chain, create a new chain */
				clst = create_chain( fp->fs, 0 );
				if( clst == 1 )
				{
					ABORT( fp->fs, FR_INT_ERR );
				}

				if( clst == 0xFFFFFFFF )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				fp->org_clust = clst;
			}

				#endif
			fp->curr_clust = clst;
		}

		if( clst != 0 )
		{
			while( ofs > bcs )
			{						/* Cluster following loop */
					#if !_FS_READONLY
				if( fp->flag & FA_WRITE )
				{					/* Check if in write mode or not */
					clst = create_chain( fp->fs, clst );	/* Force streached if in write mode */
					if( clst == 0 )
					{	/* When disk gets full, clip file size */
						ofs = bcs;
						break;
					}
				}
				else
						#endif
					clst = get_fat( fp->fs, clst );		/* Follow cluster chain if not in write mode */
				if( clst == 0xFFFFFFFF )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				if( clst <= 1 || clst >= fp->fs->max_clust )
				{
					ABORT( fp->fs, FR_INT_ERR );
				}

				fp->curr_clust = clst;
				fp->fptr += bcs;
				ofs -= bcs;
			}

			fp->fptr += ofs;
			fp->csect = ( BYTE ) ( ofs / SS(fp->fs) );	/* Sector offset in the cluster */
			if( ofs % SS(fp->fs) )
			{
				nsect = clust2sect( fp->fs, clst );		/* Current sector */
				if( !nsect )
				{
					ABORT( fp->fs, FR_INT_ERR );
				}

				nsect += fp->csect;
				fp->csect++;
			}
		}
	}

	if( fp->fptr % SS(fp->fs) && nsect != fp->dsect )
	{
			#if !_FS_TINY
				#if !_FS_READONLY
		if( fp->flag & FA__DIRTY )
		{	/* Write-back dirty buffer if needed */
			if( disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK )
			{
				ABORT( fp->fs, FR_DISK_ERR );
			}

			fp->flag &= ~FA__DIRTY;
		}

				#endif
		if( disk_read(fp->fs->drive, fp->buf, nsect, 1) != RES_OK )
		{
			ABORT( fp->fs, FR_DISK_ERR );
		}

			#endif
		fp->dsect = nsect;
	}

		#if !_FS_READONLY
	if( fp->fptr > fp->fsize )
	{		/* Set changed flag if the file size is extended */
		fp->fsize = fp->fptr;
		fp->flag |= FA__WRITTEN;
	}

		#endif
	LEAVE_FF( fp->fs, res );
}

	#if _FS_MINIMIZE <= 1

/*-----------------------------------------------------------------------*/

/* Create a Directroy Object                                             */

/*-----------------------------------------------------------------------*/
FRESULT f_opendir( DIR *dj, /* Pointer to directory object to create */ const XCHAR *path /* Pointer to the directory path */ )
{
	FRESULT res;
	NAMEBUF( sfn, lfn );

	BYTE	*dir;

	res = chk_mounted( &path, &dj->fs, 0 );
	if( res == FR_OK )
	{
		INITBUF( (*dj), sfn, lfn );
		res = follow_path( dj, path );	/* Follow the path to the directory */
		if( res == FR_OK )
		{			/* Follow completed */
			dir = dj->dir;
			if( dir )
			{		/* It is not the root dir */
				if( dir[DIR_Attr] & AM_DIR )
				{	/* The object is a directory */
					dj->sclust = ( (DWORD) LD_WORD(dir + DIR_FstClusHI) << 16 ) | LD_WORD( dir + DIR_FstClusLO );
				}
				else
				{	/* The object is not a directory */
					res = FR_NO_PATH;
				}
			}

			if( res == FR_OK )
			{
				dj->id = dj->fs->id;
				res = dir_seek( dj, 0 );	/* Rewind dir */
			}
		}

		if( res == FR_NO_FILE )
		{
			res = FR_NO_PATH;
		}
	}

	LEAVE_FF( dj->fs, res );
}

/*-----------------------------------------------------------------------*/

/* Read Directory Entry in Sequense                                      */

/*-----------------------------------------------------------------------*/
FRESULT f_readdir( DIR *dj, /* Pointer to the open directory object */ FILINFO *fno /* Pointer to file information to return */ )
{
	FRESULT res;
	NAMEBUF( sfn, lfn );

	res = validate( dj->fs, dj->id );	/* Check validity of the object */
	if( res == FR_OK )
	{
		INITBUF( (*dj), sfn, lfn );
		if( !fno )
		{
			res = dir_seek( dj, 0 );
		}
		else
		{
			res = dir_read( dj );
			if( res == FR_NO_FILE )
			{
				dj->sect = 0;
				res = FR_OK;
			}

			if( res == FR_OK )
			{	/* A valid entry is found */
				get_fileinfo( dj, fno );		/* Get the object information */
				res = dir_next( dj, FALSE );	/* Increment index for next */
				if( res == FR_NO_FILE )
				{
					dj->sect = 0;
					res = FR_OK;
				}
			}
		}
	}

	LEAVE_FF( dj->fs, res );
}

		#if _FS_MINIMIZE == 0

/*-----------------------------------------------------------------------*/

/* Get File Status                                                       */

/*-----------------------------------------------------------------------*/
FRESULT f_stat( const XCHAR *path, /* Pointer to the file path */ FILINFO *fno /* Pointer to file information to return */ )
{
	FRESULT res;
	DIR		dj;
	NAMEBUF( sfn, lfn );

	res = chk_mounted( &path, &dj.fs, 0 );
	if( res == FR_OK )
	{
		INITBUF( dj, sfn, lfn );
		res = follow_path( &dj, path ); /* Follow the file path */
		if( res == FR_OK )
		{		/* Follwo completed */
			if( dj.dir )
			{	/* Found an object */
				get_fileinfo( &dj, fno );
			}
			else
			{	/* It is root dir */
				res = FR_INVALID_NAME;
			}
		}
	}

	LEAVE_FF( dj.fs, res );
}

			#if !_FS_READONLY

/*-----------------------------------------------------------------------*/

/* Get Number of Free Clusters                                           */

/*-----------------------------------------------------------------------*/
FRESULT f_getfree
		(
			const XCHAR *path,	/* Pointer to the logical drive number (root dir) */
			DWORD		*nclst, /* Pointer to the variable to return number of free clusters */
			FATFS		**fatfs /* Pointer to pointer to corresponding file system object to return */
		)
{
	FRESULT res;
	DWORD	n, clst, sect, stat;
	UINT	i;
	BYTE	fat, *p;

	/* Get drive number */
	res = chk_mounted( &path, fatfs, 0 );
	if( res != FR_OK )
	{
		LEAVE_FF( *fatfs, res );
	}

	/* If number of free cluster is valid, return it without cluster scan. */
	if( (*fatfs)->free_clust <= (*fatfs)->max_clust - 2 )
	{
		*nclst = ( *fatfs )->free_clust;
		LEAVE_FF( *fatfs, FR_OK );
	}

	/* Get number of free clusters */
	fat = ( *fatfs )->fs_type;
	n = 0;
	if( fat == FS_FAT12 )
	{
		clst = 2;
		do
		{
			stat = get_fat( *fatfs, clst );
			if( stat == 0xFFFFFFFF )
			{
				LEAVE_FF( *fatfs, FR_DISK_ERR );
			}

			if( stat == 1 )
			{
				LEAVE_FF( *fatfs, FR_INT_ERR );
			}

			if( stat == 0 )
			{
				n++;
			}
		} while( ++clst < (*fatfs)->max_clust );
	}
	else
	{
		clst = ( *fatfs )->max_clust;
		sect = ( *fatfs )->fatbase;
		i = 0;
		p = 0;
		do
		{
			if( !i )
			{
				res = move_window( *fatfs, sect++ );
				if( res != FR_OK )
				{
					LEAVE_FF( *fatfs, res );
				}

				p = ( *fatfs )->win;
				i = SS( *fatfs );
			}

			if( fat == FS_FAT16 )
			{
				if( LD_WORD(p) == 0 )
				{
					n++;
				}

				p += 2;
				i -= 2;
			}
			else
			{
				if( (LD_DWORD(p) & 0x0FFFFFFF) == 0 )
				{
					n++;
				}

				p += 4;
				i -= 4;
			}
		} while( --clst );
	}

	( *fatfs )->free_clust = n;
	if( fat == FS_FAT32 )
	{
		( *fatfs )->fsi_flag = 1;
	}

	*nclst = n;

	LEAVE_FF( *fatfs, FR_OK );
}

/*-----------------------------------------------------------------------*/

/* Truncate File                                                         */

/*-----------------------------------------------------------------------*/
FRESULT f_truncate( FIL *fp /* Pointer to the file object */ )
{
	FRESULT res;
	DWORD	ncl;

	res = validate( fp->fs, fp->id );	/* Check validity of the object */
	if( res != FR_OK )
	{
		LEAVE_FF( fp->fs, res );
	}

	if( fp->flag & FA__ERROR )
	{	/* Check abort flag */
		LEAVE_FF( fp->fs, FR_INT_ERR );
	}

	if( !(fp->flag & FA_WRITE) )
	{	/* Check access mode */
		LEAVE_FF( fp->fs, FR_DENIED );
	}

	if( fp->fsize > fp->fptr )
	{
		fp->fsize = fp->fptr;	/* Set file size to current R/W point */
		fp->flag |= FA__WRITTEN;
		if( fp->fptr == 0 )
		{						/* When set file size to zero, remove entire cluster chain */
			res = remove_chain( fp->fs, fp->org_clust );
			fp->org_clust = 0;
		}
		else
		{						/* When truncate a part of the file, remove remaining clusters */
			ncl = get_fat( fp->fs, fp->curr_clust );
			res = FR_OK;
			if( ncl == 0xFFFFFFFF )
			{
				res = FR_DISK_ERR;
			}

			if( ncl == 1 )
			{
				res = FR_INT_ERR;
			}

			if( res == FR_OK && ncl < fp->fs->max_clust )
			{
				res = put_fat( fp->fs, fp->curr_clust, 0x0FFFFFFF );
				if( res == FR_OK )
				{
					res = remove_chain( fp->fs, ncl );
				}
			}
		}
	}

	if( res != FR_OK )
	{
		fp->flag |= FA__ERROR;
	}

	LEAVE_FF( fp->fs, res );
}

/*-----------------------------------------------------------------------*/

/* Delete a File or Directory                                            */

/*-----------------------------------------------------------------------*/
FRESULT f_unlink( const XCHAR *path /* Pointer to the file or directory path */ )
{
	FRESULT res;
	DIR		dj, sdj;
	NAMEBUF( sfn, lfn );

	BYTE	*dir;
	DWORD	dclst;

	res = chk_mounted( &path, &dj.fs, 1 );
	if( res != FR_OK )
	{
		LEAVE_FF( dj.fs, res );
	}

	INITBUF( dj, sfn, lfn );
	res = follow_path( &dj, path ); /* Follow the file path */
	if( _FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT) )
	{
		res = FR_INVALID_NAME;
	}

	if( res != FR_OK )
	{
		LEAVE_FF( dj.fs, res );		/* Follow failed */
	}

	dir = dj.dir;
	if( !dir )
	{	/* Is it the root directory? */
		LEAVE_FF( dj.fs, FR_INVALID_NAME );
	}

	if( dir[DIR_Attr] & AM_RDO )
	{	/* Is it a R/O object? */
		LEAVE_FF( dj.fs, FR_DENIED );
	}

	dclst = ( (DWORD) LD_WORD(dir + DIR_FstClusHI) << 16 ) | LD_WORD( dir + DIR_FstClusLO );

	if( dir[DIR_Attr] & AM_DIR )
	{	/* It is a sub-directory */
		if( dclst < 2 )
		{
			LEAVE_FF( dj.fs, FR_INT_ERR );
		}

		mem_cpy( &sdj, &dj, sizeof(DIR) );		/* Check if the sub-dir is empty or not */
		sdj.sclust = dclst;
		res = dir_seek( &sdj, 2 );
		if( res != FR_OK )
		{
			LEAVE_FF( dj.fs, res );
		}

		res = dir_read( &sdj );
		if( res == FR_OK )
		{
			res = FR_DENIED;					/* Not empty sub-dir */
		}

		if( res != FR_NO_FILE )
		{
			LEAVE_FF( dj.fs, res );
		}
	}

	res = dir_remove( &dj );					/* Remove directory entry */
	if( res == FR_OK )
	{
		if( dclst )
		{
			res = remove_chain( dj.fs, dclst ); /* Remove the cluster chain */
		}

		if( res == FR_OK )
		{
			res = sync( dj.fs );
		}
	}

	LEAVE_FF( dj.fs, res );
}

/*-----------------------------------------------------------------------*/

/* Create a Directory                                                    */

/*-----------------------------------------------------------------------*/
FRESULT f_mkdir( const XCHAR *path /* Pointer to the directory path */ )
{
	FRESULT res;
	DIR		dj;
	NAMEBUF( sfn, lfn );

	BYTE	*dir, n;
	DWORD	dsect, dclst, pclst, tim;

	res = chk_mounted( &path, &dj.fs, 1 );
	if( res != FR_OK )
	{
		LEAVE_FF( dj.fs, res );
	}

	INITBUF( dj, sfn, lfn );
	res = follow_path( &dj, path ); /* Follow the file path */
	if( res == FR_OK )
	{
		res = FR_EXIST;				/* Any file or directory is already existing */
	}

	if( _FS_RPATH && res == FR_NO_FILE && (dj.fn[NS] & NS_DOT) )
	{
		res = FR_INVALID_NAME;
	}

	if( res != FR_NO_FILE )
	{	/* Any error occured */
		LEAVE_FF( dj.fs, res );
	}

	dclst = create_chain( dj.fs, 0 );		/* Allocate a new cluster for new directory table */
	res = FR_OK;
	if( dclst == 0 )
	{
		res = FR_DENIED;
	}

	if( dclst == 1 )
	{
		res = FR_INT_ERR;
	}

	if( dclst == 0xFFFFFFFF )
	{
		res = FR_DISK_ERR;
	}

	if( res == FR_OK )
	{
		res = move_window( dj.fs, 0 );
	}

	if( res != FR_OK )
	{
		LEAVE_FF( dj.fs, res );
	}

	dsect = clust2sect( dj.fs, dclst );

	dir = dj.fs->win;						/* Initialize the new directory table */
	mem_set( dir, 0, SS(dj.fs) );
	mem_set( dir + DIR_Name, ' ', 8 + 3 );	/* Create "." entry */
	dir[DIR_Name] = '.';
	dir[DIR_Attr] = AM_DIR;
	tim = get_fattime();
	ST_DWORD( dir + DIR_WrtTime, tim );
	ST_WORD( dir + DIR_FstClusLO, dclst );
	ST_WORD( dir + DIR_FstClusHI, dclst >> 16 );
	mem_cpy( dir + 32, dir, 32 );			/* Create ".." entry */
	dir[33] = '.';
	pclst = dj.sclust;
	if( dj.fs->fs_type == FS_FAT32 && pclst == dj.fs->dirbase )
	{
		pclst = 0;
	}

	ST_WORD( dir + 32 + DIR_FstClusLO, pclst );
	ST_WORD( dir + 32 + DIR_FstClusHI, pclst >> 16 );
	for( n = 0; n < dj.fs->csize; n++ )
	{	/* Write dot entries and clear left sectors */
		dj.fs->winsect = dsect++;
		dj.fs->wflag = 1;
		res = move_window( dj.fs, 0 );
		if( res )
		{
			LEAVE_FF( dj.fs, res );
		}

		mem_set( dir, 0, SS(dj.fs) );
	}

	res = dir_register( &dj );
	if( res != FR_OK )
	{
		remove_chain( dj.fs, dclst );
	}
	else
	{
		dir = dj.dir;
		dir[DIR_Attr] = AM_DIR;					/* Attribute */
		ST_DWORD( dir + DIR_WrtTime, tim );		/* Crated time */
		ST_WORD( dir + DIR_FstClusLO, dclst );	/* Table start cluster */
		ST_WORD( dir + DIR_FstClusHI, dclst >> 16 );
		dj.fs->wflag = 1;
		res = sync( dj.fs );
	}

	LEAVE_FF( dj.fs, res );
}

/*-----------------------------------------------------------------------*/

/* Change File Attribute                                                 */

/*-----------------------------------------------------------------------*/
FRESULT f_chmod( const XCHAR *path, /* Pointer to the file path */ BYTE value, /* Attribute bits */ BYTE mask /* Attribute mask to change */ )
{
	FRESULT res;
	DIR		dj;
	NAMEBUF( sfn, lfn );

	BYTE	*dir;

	res = chk_mounted( &path, &dj.fs, 1 );
	if( res == FR_OK )
	{
		INITBUF( dj, sfn, lfn );
		res = follow_path( &dj, path ); /* Follow the file path */
		if( _FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT) )
		{
			res = FR_INVALID_NAME;
		}

		if( res == FR_OK )
		{
			dir = dj.dir;
			if( !dir )
			{	/* Is it a root directory? */
				res = FR_INVALID_NAME;
			}
			else
			{	/* File or sub directory */
				mask &= AM_RDO | AM_HID | AM_SYS | AM_ARC;	/* Valid attribute mask */
				dir[DIR_Attr] = ( value & mask ) | ( dir[DIR_Attr] & (BYTE)~mask ); /* Apply attribute change */
				dj.fs->wflag = 1;
				res = sync( dj.fs );
			}
		}
	}

	LEAVE_FF( dj.fs, res );
}

/*-----------------------------------------------------------------------*/

/* Change Timestamp                                                      */

/*-----------------------------------------------------------------------*/
FRESULT f_utime( const XCHAR *path, /* Pointer to the file/directory name */ const FILINFO *fno /* Pointer to the timestamp to be set */ )
{
	FRESULT res;
	DIR		dj;
	NAMEBUF( sfn, lfn );

	BYTE	*dir;

	res = chk_mounted( &path, &dj.fs, 1 );
	if( res == FR_OK )
	{
		INITBUF( dj, sfn, lfn );
		res = follow_path( &dj, path ); /* Follow the file path */
		if( _FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT) )
		{
			res = FR_INVALID_NAME;
		}

		if( res == FR_OK )
		{
			dir = dj.dir;
			if( !dir )
			{	/* Root directory */
				res = FR_INVALID_NAME;
			}
			else
			{	/* File or sub-directory */
				ST_WORD( dir + DIR_WrtTime, fno->ftime );
				ST_WORD( dir + DIR_WrtDate, fno->fdate );
				dj.fs->wflag = 1;
				res = sync( dj.fs );
			}
		}
	}

	LEAVE_FF( dj.fs, res );
}

/*-----------------------------------------------------------------------*/

/* Rename File/Directory                                                 */

/*-----------------------------------------------------------------------*/
FRESULT f_rename( const XCHAR *path_old, /* Pointer to the old name */ const XCHAR *path_new /* Pointer to the new name */ )
{
	FRESULT res;
	DIR		dj_old, dj_new;
	NAMEBUF( sfn, lfn );

	BYTE	buf[21], *dir;
	DWORD	dw;

	INITBUF( dj_old, sfn, lfn );
	res = chk_mounted( &path_old, &dj_old.fs, 1 );
	if( res == FR_OK )
	{
		dj_new.fs = dj_old.fs;
		res = follow_path( &dj_old, path_old ); /* Check old object */
		if( _FS_RPATH && res == FR_OK && (dj_old.fn[NS] & NS_DOT) )
		{
			res = FR_INVALID_NAME;
		}
	}

	if( res != FR_OK )
	{
		LEAVE_FF( dj_old.fs, res );				/* The old object is not found */
	}

	if( !dj_old.dir )
	{
		LEAVE_FF( dj_old.fs, FR_NO_FILE );		/* Is root dir? */
	}

	mem_cpy( buf, dj_old.dir + DIR_Attr, 21 );	/* Save the object information */

	mem_cpy( &dj_new, &dj_old, sizeof(DIR) );
	res = follow_path( &dj_new, path_new );		/* Check new object */
	if( res == FR_OK )
	{
		res = FR_EXIST;					/* The new object name is already existing */
	}

	if( res == FR_NO_FILE )
	{									/* Is it a valid path and no name collision? */
		res = dir_register( &dj_new );	/* Register the new object */
		if( res == FR_OK )
		{
			dir = dj_new.dir;			/* Copy object information into new entry */
			mem_cpy( dir + 13, buf + 2, 19 );
			dir[DIR_Attr] = buf[0] | AM_ARC;
			dj_old.fs->wflag = 1;
			if( dir[DIR_Attr] & AM_DIR )
			{	/* Update .. entry in the directory if needed */
				dw = clust2sect( dj_new.fs, (DWORD) LD_WORD(dir + DIR_FstClusHI) | LD_WORD(dir + DIR_FstClusLO) );
				if( !dw )
				{
					res = FR_INT_ERR;
				}
				else
				{
					res = move_window( dj_new.fs, dw );
					dir = dj_new.fs->win + 32;
					if( res == FR_OK && dir[1] == '.' )
					{
						dw = ( dj_new.fs->fs_type == FS_FAT32 && dj_new.sclust == dj_new.fs->dirbase ) ? 0 : dj_new.sclust;
						ST_WORD( dir + DIR_FstClusLO, dw );
						ST_WORD( dir + DIR_FstClusHI, dw >> 16 );
						dj_new.fs->wflag = 1;
					}
				}
			}

			if( res == FR_OK )
			{
				res = dir_remove( &dj_old );	/* Remove old entry */
				if( res == FR_OK )
				{
					res = sync( dj_old.fs );
				}
			}
		}
	}

	LEAVE_FF( dj_old.fs, res );
}

			#endif /* !_FS_READONLY */
		#endif /* _FS_MINIMIZE == 0 */
	#endif /* _FS_MINIMIZE <= 1 */
#endif /* _FS_MINIMIZE <= 2 */

/*-----------------------------------------------------------------------*/

/* Forward data to the stream directly (Available on only _FS_TINY cfg)  */

/*-----------------------------------------------------------------------*/
#if _USE_FORWARD && _FS_TINY
FRESULT f_forward
		(
			FIL *fp,	/* Pointer to the file object */
			UINT (*func) ( const BYTE *, UINT ),	/* Pointer to the streaming function */
			UINT btr,	/* Number of bytes to forward */
			UINT *bf	/* Pointer to number of bytes forwarded */
		)
{
	FRESULT res;
	DWORD	remain, clst, sect;
	UINT	rcnt;

	*bf = 0;

	res = validate( fp->fs, fp->id );	/* Check validity of the object */
	if( res != FR_OK )
	{
		LEAVE_FF( fp->fs, res );
	}

	if( fp->flag & FA__ERROR )
	{	/* Check error flag */
		LEAVE_FF( fp->fs, FR_INT_ERR );
	}

	if( !(fp->flag & FA_READ) )
	{	/* Check access mode */
		LEAVE_FF( fp->fs, FR_DENIED );
	}

	remain = fp->fsize - fp->fptr;
	if( btr > remain )
	{
		btr = ( UINT ) remain;		/* Truncate btr by remaining bytes */
	}

	for
	(
		;
		btr && (*func) (NULL, 0);	/* Repeat until all data transferred or stream becomes busy */
		fp->fptr += rcnt, *bf += rcnt, btr -= rcnt
	)
	{
		if( (fp->fptr % SS(fp->fs)) == 0 )
		{		/* On the sector boundary? */
			if( fp->csect >= fp->fs->csize )
			{	/* On the cluster boundary? */
				clst = ( fp->fptr == 0 ) ?				/* On the top of the file? */
				fp->org_clust : get_fat( fp->fs, fp->curr_clust );
				if( clst <= 1 )
				{
					ABORT( fp->fs, FR_INT_ERR );
				}

				if( clst == 0xFFFFFFFF )
				{
					ABORT( fp->fs, FR_DISK_ERR );
				}

				fp->curr_clust = clst;					/* Update current cluster */
				fp->csect = 0;							/* Reset sector address in the cluster */
			}

			fp->csect++;								/* Next sector address in the cluster */
		}

		sect = clust2sect( fp->fs, fp->curr_clust );	/* Get current data sector */
		if( !sect )
		{
			ABORT( fp->fs, FR_INT_ERR );
		}

		sect += fp->csect - 1;
		if( move_window(fp->fs, sect) )
		{	/* Move sector window */
			ABORT( fp->fs, FR_DISK_ERR );
		}

		fp->dsect = sect;
		rcnt = SS( fp->fs ) - ( WORD ) ( fp->fptr % SS(fp->fs) );	/* Forward data from sector window */
		if( rcnt > btr )
		{
			rcnt = btr;
		}

		rcnt = ( *func ) ( &fp->fs->win[(WORD) fp->fptr % SS(fp->fs)], rcnt );
		if( !rcnt )
		{
			ABORT( fp->fs, FR_INT_ERR );
		}
	}

	LEAVE_FF( fp->fs, FR_OK );
}

#endif /* _USE_FORWARD */

#if _USE_MKFS && !_FS_READONLY

/*-----------------------------------------------------------------------*/

/* Create File System on the Drive                                       */

/*-----------------------------------------------------------------------*/
	#define N_ROOTDIR	512			/* Multiple of 32 and <= 2048 */
	#define N_FATS		1			/* 1 or 2 */
	#define MAX_SECTOR	131072000UL /* Maximum partition size */
	#define MIN_SECTOR	2000UL		/* Minimum partition size */

FRESULT f_mkfs
		(
			BYTE	drv,		/* Logical drive number */
			BYTE	partition,	/* Partitioning rule 0:FDISK, 1:SFD */
			WORD	allocsize	/* Allocation unit size [bytes] */
		)
{
	static const DWORD	sstbl[] = { 2048000, 1024000, 512000, 256000, 128000, 64000, 32000, 16000, 8000, 4000, 0 };
	static const WORD	cstbl[] = { 32768, 16384, 8192, 4096, 2048, 16384, 8192, 4096, 2048, 1024, 512 };
	BYTE				fmt, m, *tbl;
	DWORD				b_part, b_fat, b_dir, b_data;	/* Area offset (LBA) */
	DWORD				n_part, n_rsv, n_fat, n_dir;	/* Area size */
	DWORD				n_clst, d, n;
	WORD				as;
	FATFS				*fs;
	DSTATUS				stat;

	/* Check validity of the parameters */
	if( drv >= _DRIVES )
	{
		return FR_INVALID_DRIVE;
	}

	if( partition >= 2 )
	{
		return FR_MKFS_ABORTED;
	}

	/* Check mounted drive and clear work area */
	fs = FatFs[drv];
	if( !fs )
	{
		return FR_NOT_ENABLED;
	}

	fs->fs_type = 0;
	drv = LD2PD( drv );

	/* Get disk statics */
	stat = disk_initialize( drv );
	if( stat & STA_NOINIT )
	{
		return FR_NOT_READY;
	}

	if( stat & STA_PROTECT )
	{
		return FR_WRITE_PROTECTED;
	}

		#if _MAX_SS != 512				/* Get disk sector size */
	if( disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS )
	{
		return FR_MKFS_ABORTED;
	}

		#endif
	if( disk_ioctl(drv, GET_SECTOR_COUNT, &n_part) != RES_OK || n_part < MIN_SECTOR )
	{
		return FR_MKFS_ABORTED;
	}

	if( n_part > MAX_SECTOR )
	{
		n_part = MAX_SECTOR;
	}

	b_part = ( !partition ) ? 63 : 0;	/* Boot sector */
	n_part -= b_part;
	for( d = 512; d <= 32768U && d != allocsize; d <<= 1 );

	/* Check validity of the allocation unit size */
	if( d != allocsize )
	{
		allocsize = 0;
	}

	if( !allocsize )
	{						/* Auto selection of cluster size */
		d = n_part;
		for( as = SS(fs); as > 512U; as >>= 1 )
		{
			d >>= 1;
		}

		for( n = 0; d < sstbl[n]; n++ );
		allocsize = cstbl[n];
	}

	if( allocsize < SS(fs) )
	{
		allocsize = SS( fs );
	}

	allocsize /= SS( fs );	/* Number of sectors per cluster */

	/* Pre-compute number of clusters and FAT type */
	n_clst = n_part / allocsize;
	fmt = FS_FAT12;
	if( n_clst >= 0xFF5 )
	{
		fmt = FS_FAT16;
	}

	if( n_clst >= 0xFFF5 )
	{
		fmt = FS_FAT32;
	}

	/* Determine offset and size of FAT structure */
	switch( fmt )
	{
		case FS_FAT12:
			n_fat = ( (n_clst * 3 + 1) / 2 + 3 + SS(fs) - 1 ) / SS( fs );
			n_rsv = 1 + partition;
			n_dir = N_ROOTDIR * 32 / SS( fs );
			break;

		case FS_FAT16:
			n_fat = ( (n_clst * 2) + 4 + SS(fs) - 1 ) / SS( fs );
			n_rsv = 1 + partition;
			n_dir = N_ROOTDIR * 32 / SS( fs );
			break;

		default:
			n_fat = ( (n_clst * 4) + 8 + SS(fs) - 1 ) / SS( fs );
			n_rsv = 33 - partition;
			n_dir = 0;
	}

	b_fat = b_part + n_rsv; /* FATs start sector */
	b_dir = b_fat + n_fat * N_FATS;		/* Directory start sector */
	b_data = b_dir + n_dir;				/* Data start sector */

	/* Align data start sector to erase block boundary (for flash memory media) */
	if( disk_ioctl(drv, GET_BLOCK_SIZE, &n) != RES_OK )
	{
		return FR_MKFS_ABORTED;
	}

	n = ( b_data + n - 1 ) &~( n - 1 );
	n_fat += ( n - b_data ) / N_FATS;

	/* b_dir and b_data are no longer used below */

	/* Determine number of cluster and final check of validity of the FAT type */
	n_clst = ( n_part - n_rsv - n_fat * N_FATS - n_dir ) / allocsize;
	if( (fmt == FS_FAT16 && n_clst < 0xFF5) || (fmt == FS_FAT32 && n_clst < 0xFFF5) )
	{
		return FR_MKFS_ABORTED;
	}

	/* Create partition table if needed */
	if( !partition )
	{
		DWORD	n_disk = b_part + n_part;

		mem_set( fs->win, 0, SS(fs) );
		tbl = fs->win + MBR_Table;
		ST_DWORD( tbl, 0x00010180 );	/* Partition start in CHS */
		if( n_disk < 63UL * 255 * 1024 )
		{	/* Partition end in CHS */
			n_disk = n_disk / 63 / 255;
			tbl[7] = ( BYTE ) n_disk;
			tbl[6] = ( BYTE ) ( (n_disk >> 2) | 63 );
		}
		else
		{
			ST_WORD( &tbl[6], 0xFFFF );
		}

		tbl[5] = 254;
		if( fmt != FS_FAT32 )
		{	/* System ID */
			tbl[4] = ( n_part < 0x10000 ) ? 0x04 : 0x06;
		}
		else
		{
			tbl[4] = 0x0c;
		}

		ST_DWORD( tbl + 8, 63 );							/* Partition start in LBA */
		ST_DWORD( tbl + 12, n_part );						/* Partition size in LBA */
		ST_WORD( tbl + 64, 0xAA55 );						/* Signature */
		if( disk_write(drv, fs->win, 0, 1) != RES_OK )
		{
			return FR_DISK_ERR;
		}

		partition = 0xF8;
	}
	else
	{
		partition = 0xF0;
	}

	/* Create boot record */
	tbl = fs->win;											/* Clear buffer */
	mem_set( tbl, 0, SS(fs) );
	ST_DWORD( tbl + BS_jmpBoot, 0x90FEEB );					/* Boot code (jmp $, nop) */
	ST_WORD( tbl + BPB_BytsPerSec, SS(fs) );				/* Sector size */
	tbl[BPB_SecPerClus] = ( BYTE ) allocsize;				/* Sectors per cluster */
	ST_WORD( tbl + BPB_RsvdSecCnt, n_rsv );					/* Reserved sectors */
	tbl[BPB_NumFATs] = N_FATS;								/* Number of FATs */
	ST_WORD( tbl + BPB_RootEntCnt, SS(fs) / 32 * n_dir );	/* Number of rootdir entries */
	if( n_part < 0x10000 )
	{	/* Number of total sectors */
		ST_WORD( tbl + BPB_TotSec16, n_part );
	}
	else
	{
		ST_DWORD( tbl + BPB_TotSec32, n_part );
	}

	tbl[BPB_Media] = partition;									/* Media descripter */
	ST_WORD( tbl + BPB_SecPerTrk, 63 );							/* Number of sectors per track */
	ST_WORD( tbl + BPB_NumHeads, 255 );							/* Number of heads */
	ST_DWORD( tbl + BPB_HiddSec, b_part );						/* Hidden sectors */
	n = get_fattime();											/* Use current time as a VSN */
	if( fmt != FS_FAT32 )
	{
		ST_DWORD( tbl + BS_VolID, n );							/* Volume serial number */
		ST_WORD( tbl + BPB_FATSz16, n_fat );					/* Number of secters per FAT */
		tbl[BS_DrvNum] = 0x80;									/* Drive number */
		tbl[BS_BootSig] = 0x29;									/* Extended boot signature */
		mem_cpy( tbl + BS_VolLab, "NO NAME    FAT     ", 19 );	/* Volume lavel, FAT signature */
	}
	else
	{
		ST_DWORD( tbl + BS_VolID32, n );						/* Volume serial number */
		ST_DWORD( tbl + BPB_FATSz32, n_fat );					/* Number of secters per FAT */
		ST_DWORD( tbl + BPB_RootClus, 2 );						/* Root directory cluster (2) */
		ST_WORD( tbl + BPB_FSInfo, 1 );		/* FSInfo record offset (bs+1) */
		ST_WORD( tbl + BPB_BkBootSec, 6 );	/* Backup boot record offset (bs+6) */
		tbl[BS_DrvNum32] = 0x80;			/* Drive number */
		tbl[BS_BootSig32] = 0x29;			/* Extended boot signature */
		mem_cpy( tbl + BS_VolLab32, "NO NAME    FAT32   ", 19 );	/* Volume lavel, FAT signature */
	}

	ST_WORD( tbl + BS_55AA, 0xAA55 );			/* Signature */
	if( SS(fs) > 512U )
	{
		ST_WORD( tbl + SS(fs) - 2, 0xAA55 );
	}

	if( disk_write(drv, tbl, b_part + 0, 1) != RES_OK )
	{
		return FR_DISK_ERR;
	}

	if( fmt == FS_FAT32 )
	{
		disk_write( drv, tbl, b_part + 6, 1 );
	}

	/* Initialize FAT area */
	for( m = 0; m < N_FATS; m++ )
	{
		mem_set( tbl, 0, SS(fs) );				/* 1st sector of the FAT  */
		if( fmt != FS_FAT32 )
		{
			n = ( fmt == FS_FAT12 ) ? 0x00FFFF00 : 0xFFFFFF00;
			n |= partition;
			ST_DWORD( tbl, n );					/* Reserve cluster #0-1 (FAT12/16) */
		}
		else
		{
			ST_DWORD( tbl + 0, 0xFFFFFFF8 );	/* Reserve cluster #0-1 (FAT32) */
			ST_DWORD( tbl + 4, 0xFFFFFFFF );
			ST_DWORD( tbl + 8, 0x0FFFFFFF );	/* Reserve cluster #2 for root dir */
		}

		if( disk_write(drv, tbl, b_fat++, 1) != RES_OK )
		{
			return FR_DISK_ERR;
		}

		mem_set( tbl, 0, SS(fs) );				/* Following FAT entries are filled by zero */
		for( n = 1; n < n_fat; n++ )
		{
			if( disk_write(drv, tbl, b_fat++, 1) != RES_OK )
			{
				return FR_DISK_ERR;
			}
		}
	}

	/* Initialize Root directory */
	m = ( BYTE ) ( (fmt == FS_FAT32) ? allocsize : n_dir );
	do
	{
		if( disk_write(drv, tbl, b_fat++, 1) != RES_OK )
		{
			return FR_DISK_ERR;
		}
	} while( --m );

	/* Create FSInfo record if needed */
	if( fmt == FS_FAT32 )
	{
		ST_WORD( tbl + BS_55AA, 0xAA55 );
		ST_DWORD( tbl + FSI_LeadSig, 0x41615252 );
		ST_DWORD( tbl + FSI_StrucSig, 0x61417272 );
		ST_DWORD( tbl + FSI_Free_Count, n_clst - 1 );
		ST_DWORD( tbl + FSI_Nxt_Free, 0xFFFFFFFF );
		disk_write( drv, tbl, b_part + 1, 1 );
		disk_write( drv, tbl, b_part + 7, 1 );
	}

	return( disk_ioctl(drv, CTRL_SYNC, ( void * ) NULL) == RES_OK ) ? FR_OK : FR_DISK_ERR;
}

#endif /* _USE_MKFS && !_FS_READONLY */

#if _USE_STRFUNC

/*-----------------------------------------------------------------------*/

/* Get a string from the file                                            */

/*-----------------------------------------------------------------------*/
char *f_gets
	(
		char	*buff,	/* Pointer to the string buffer to read */
		int		len,	/* Size of string buffer */
		FIL		*fil	/* Pointer to the file object */
	)
{
	int		i = 0;
	char	*p = buff;
	UINT	rc;

	while( i < len - 1 )
	{						/* Read bytes until buffer gets filled */
		f_read( fil, p, 1, &rc );
		if( rc != 1 )
		{
			break;			/* Break when no data to read */
		}

			#if _USE_STRFUNC >= 2
		if( *p == '\r' )
		{
			continue;		/* Strip '\r' */
		}

			#endif
		i++;
		if( *p++ == '\n' )
		{
			break;			/* Break when reached end of line */
		}
	}

	*p = 0;
	return i ? buff : NULL; /* When no data read (eof or error), return with error. */
}

	#if !_FS_READONLY
		#include <stdarg.h>

/*-----------------------------------------------------------------------*/

/* Put a character to the file                                           */

/*-----------------------------------------------------------------------*/
int f_putc( int chr, /* A character to be output */ FIL *fil /* Ponter to the file object */ )
{
	UINT	bw;
	char	c;

			#if _USE_STRFUNC >= 2
	if( chr == '\n' )
	{
		f_putc( '\r', fil );	/* LF -> CRLF conversion */
	}

			#endif
	if( !fil )
	{	/* Special value may be used to switch the destination to any other device */
		/*	put_console(chr);	*/
		return chr;
	}

	c = ( char ) chr;
	f_write( fil, &c, 1, &bw ); /* Write a byte to the file */
	return bw ? chr : EOF;		/* Return the result */
}

/*-----------------------------------------------------------------------*/

/* Put a string to the file                                              */

/*-----------------------------------------------------------------------*/
int f_puts( const char *str, /* Pointer to the string to be output */ FIL *fil /* Pointer to the file object */ )
{
	int n;

	for( n = 0; *str; str++, n++ )
	{
		if( f_putc(*str, fil) == EOF )
		{
			return EOF;
		}
	}

	return n;
}

/*-----------------------------------------------------------------------*/

/* Put a formatted string to the file                                    */

/*-----------------------------------------------------------------------*/
int f_printf( FIL *fil, /* Pointer to the file object */ const char *str, /* Pointer to the format string */ ... /* Optional arguments... */ )
{
	va_list arp;
	UCHAR	c, f, r;
	ULONG	val;
	char	s[16];
	int		i, w, res, cc;

	va_start( arp, str );

	for( cc = res = 0; cc != EOF; res += cc )
	{
		c = *str++;
		if( c == 0 )
		{
			break;	/* End of string */
		}

		if( c != '%' )
		{			/* Non escape cahracter */
			cc = f_putc( c, fil );
			if( cc != EOF )
			{
				cc = 1;
			}

			continue;
		}

		w = f = 0;
		c = *str++;
		if( c == '0' )
		{			/* Flag: '0' padding */
			f = 1;
			c = *str++;
		}

		while( c >= '0' && c <= '9' )
		{			/* Precision */
			w = w * 10 + ( c - '0' );
			c = *str++;
		}

		if( c == 'l' )
		{			/* Prefix: Size is long int */
			f |= 2;
			c = *str++;
		}

		if( c == 's' )
		{			/* Type is string */
			cc = f_puts( va_arg(arp, char *), fil );
			continue;
		}

		if( c == 'c' )
		{			/* Type is character */
			cc = f_putc( va_arg(arp, int), fil );
			if( cc != EOF )
			{
				cc = 1;
			}

			continue;
		}

		r = 0;
		if( c == 'd' )
		{
			r = 10; /* Type is signed decimal */
		}

		if( c == 'u' )
		{
			r = 10; /* Type is unsigned decimal */
		}

		if( c == 'X' )
		{
			r = 16; /* Type is unsigned hexdecimal */
		}

		if( r == 0 )
		{
			break;	/* Unknown type */
		}

		if( f & 2 )
		{			/* Get the value */
			val = ( ULONG ) va_arg( arp, long );
		}
		else
		{
			val = ( c == 'd' ) ? ( ULONG ) ( long ) va_arg( arp, int ) : ( ULONG ) va_arg( arp, unsigned int );
		}

		/* Put numeral string */
		if( c == 'd' )
		{
			if( val & 0x80000000 )
			{
				val = 0 - val;
				f |= 4;
			}
		}

		i = sizeof( s ) - 1;
		s[i] = 0;
		do
		{
			c = ( UCHAR ) ( val % r + '0' );
			if( c > '9' )
			{
				c += 7;
			}

			s[--i] = c;
			val /= r;
		} while( i && val );
		if( i && (f & 4) )
		{
			s[--i] = '-';
		}

		w = sizeof( s ) - 1 - w;
		while( i && i > w )
		{
			s[--i] = ( f & 1 ) ? '0' : ' ';
		}

		cc = f_puts( &s[i], fil );
	}

	va_end( arp );
	return( cc == EOF ) ? cc : res;
}

	#endif /* !_FS_READONLY */
#endif /* _USE_STRFUNC */