Tyler Weaver
updated chan_fatfs
Fork of
chan_fatfs
by 
Eli Hughes
ff.cpp
- Committer:
- tylerjw
- Date:
- 2012-12-28
- Revision:
- 8:1f9748c6b865
- Parent:
- 3:68eaafe726ac
File content as of revision 8:1f9748c6b865:
/*----------------------------------------------------------------------------/
/ 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 (
eDIR *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 */
eDIR *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 (
eDIR *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 (
eDIR *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 */
eDIR *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 */
eDIR *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 (
eDIR *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]; /* Rerurn 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 */
eDIR *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 */
eDIR *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;
eDIR 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 = (BYTE *)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 = (const BYTE *)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 (
eDIR *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 (
eDIR *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;
eDIR 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;
eDIR 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(eDIR)); /* 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;
eDIR 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;
eDIR 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;
eDIR 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;
eDIR 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(eDIR));
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 */