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pigweed / third_party / github / FreeRTOS / FreeRTOS-Kernel / 07a20216768f13d2cdd06fc823fb9069279a4dfc / . / Demo / Common / FileSystem / FatFs-0.7e / src / ff.c
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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 */