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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [FileSystem/] [FatFs-0.7e/] [src/] [ff.c] - Blame information for rev 606

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/*----------------------------------------------------------------------------/
/  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 */
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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [FileSystem/] [FatFs-0.7e/] [src/] [ff.c] - Blame information for rev 606

Line No.	Rev	Author	Line
1	606	jeremybenn	`/*----------------------------------------------------------------------------/`
2			`/ FatFs - FAT file system module R0.07e (C)ChaN, 2009`
3			`/-----------------------------------------------------------------------------/`
4			`/ FatFs module is a generic FAT file system module for small embedded systems.`
5			`/ This is a free software that opened for education, research and commercial`
6			`/ developments under license policy of following trems.`
7			`/`
8			`/ Copyright (C) 2009, ChaN, all right reserved.`
9			`/`
10			`/ * The FatFs module is a free software and there is NO WARRANTY.`
11			`/ * No restriction on use. You can use, modify and redistribute it for`
12			`/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.`
13			`/ * Redistributions of source code must retain the above copyright notice.`
14			`/`
15			`/-----------------------------------------------------------------------------/`
16			`/ Feb 26,'06 R0.00 Prototype.`
17			`/`
18			`/ Apr 29,'06 R0.01 First stable version.`
19			`/`
20			`/ Jun 01,'06 R0.02 Added FAT12 support.`
21			`/ Removed unbuffered mode.`
22			`/ Fixed a problem on small (<32M) patition.`
23			`/ Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).`
24			`/`
25			`/ Sep 22,'06 R0.03 Added f_rename().`
26			`/ Changed option _FS_MINIMUM to _FS_MINIMIZE.`
27			`/ Dec 11,'06 R0.03a Improved cluster scan algolithm to write files fast.`
28			`/ Fixed f_mkdir() creates incorrect directory on FAT32.`
29			`/`
30			`/ Feb 04,'07 R0.04 Supported multiple drive system.`
31			`/ Changed some interfaces for multiple drive system.`
32			`/ Changed f_mountdrv() to f_mount().`
33			`/ Added f_mkfs().`
34			`/ Apr 01,'07 R0.04a Supported multiple partitions on a plysical drive.`
35			`/ Added a capability of extending file size to f_lseek().`
36			`/ Added minimization level 3.`
37			`/ Fixed an endian sensitive code in f_mkfs().`
38			`/ May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.`
39			`/ Added FSInfo support.`
40			`/ Fixed DBCS name can result FR_INVALID_NAME.`