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ff.c
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ff.c
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/*----------------------------------------------------------------------------/
/ FatFs - FAT file system module R0.07a (C)ChaN, 2009
/-----------------------------------------------------------------------------/
/ FatFs module is an open source software to implement FAT file system to
/ small embedded systems. This is a free software and is 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 use 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.
/---------------------------------------------------------------------------*/
#include "ff.h" /* FatFs configurations and declarations */
#include "diskio.h" /* Declarations of low level disk I/O functions */
#include "malloc.h"
#include "string.h"
/*--------------------------------------------------------------------------
Module Private Definitions
---------------------------------------------------------------------------*/
#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
/*--------------------------------------------------------------------------
Private Work Area
---------------------------------------------------------------------------*/
static
FATFS *FatFs[_DRIVES]; /* Pointer to the file system objects (logical drives) */
static
WORD Fsid; /* File system mount ID */
#if _USE_LFN == 1 /* LFN with static LFN working buffer */
static
WORD 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
/*--------------------------------------------------------------------------
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 ((fs->fat_buffer != NULL) && (wsect > fs->fatbase) && (wsect < (fs->fatbase + fs->sects_fat))) {
memcpy(fs->fat_buffer + (wsect - fs->fatbase) * 512, fs->win, 512);
fs->fat_dirty = 1;
} else {
if (disk_write(fs->drive, fs->win, wsect, 1) != RES_OK)
return FR_DISK_ERR;
}
fs->wflag = 0;
}
#endif
if (sector) {
if ((fs->fat_buffer != NULL) && (sector > fs->fatbase) && (sector < (fs->fatbase + fs->sects_fat))) {
memcpy(fs->win, fs->fat_buffer + (sector - fs->fatbase) * 512, 512);
} else {
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;
}
/* write all copies of FAT out to disk */
int nf;
if ((fs->fat_buffer != NULL) && (fs->fat_dirty)) {
for (nf = 0; nf < fs->n_fats; nf++) {
disk_write(fs->drive, fs->fat_buffer, fs->fatbase + nf * fs->sects_fat, fs->sects_fat);
}
fs->fat_dirty = 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
/*-----------------------------------------------------------------------*/
/* Get a cluster status */
/*-----------------------------------------------------------------------*/
static
DWORD get_cluster ( /* 0xFFFFFFFF:Disk error, 1:Interal error, Else:Cluster status */
FATFS *fs, /* File system object */
DWORD clst /* Cluster# to get the link information */
)
{
WORD wc, bc;
DWORD fsect;
if (clst < 2 || clst >= fs->max_clust) /* Check cluster address range */
return 1;
fsect = fs->fatbase;
switch (fs->fs_type) {
case FS_FAT12 :
bc = (WORD)clst * 3 / 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 */
}
/*-----------------------------------------------------------------------*/
/* Change a cluster status */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT put_cluster (
FATFS *fs, /* File system object */
DWORD clst, /* Cluster# to be changed (must be 2 to fs->max_clust-1) */
DWORD val /* New value to mark the cluster */
)
{
WORD bc;
BYTE *p;
DWORD fsect;
FRESULT res;
if (clst < 2 || clst >= fs->max_clust) { /* Check cluster address range */
res = FR_INT_ERR;
} else {
fsect = fs->fatbase;
switch (fs->fs_type) {
case FS_FAT12 :
bc = (WORD)clst * 3 / 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 */
/*-----------------------------------------------------------------------*/
/* Remove a cluster chain */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT remove_chain (
FATFS *fs, /* File system object */
DWORD clst /* Cluster# to remove chain from */
)
{
FRESULT res;
DWORD nxt;
if (clst < 2 || clst >= fs->max_clust) { /* Check cluster address range */
res = FR_INT_ERR;
} else {
res = FR_OK;
while (clst < fs->max_clust) { /* Not a last link? */
nxt = get_cluster(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_cluster(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
/*-----------------------------------------------------------------------*/
/* 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_cluster(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_cluster(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_cluster(fs, ncl, 0x0FFFFFFF)) /* Mark the new cluster "in use" */
return 0xFFFFFFFF;
if (clst != 0) { /* Link it to previous one if needed */
if (put_cluster(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# */
/*-----------------------------------------------------------------------*/
static
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;
}
/*-----------------------------------------------------------------------*/
/* 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 == 0) { /* Static table */
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);
}
else { /* Dynamic table */
ic = SS(dj->fs) / 32 * dj->fs->csize; /* Indexes per cluster */
while (idx >= ic) { /* Follow cluster chain */
clst = get_cluster(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);
}
dj->dir = dj->fs->win + (idx % (SS(dj->fs) / 32)) * 32;
return FR_OK; /* Seek succeeded */
}
/*-----------------------------------------------------------------------*/
/* 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->sclust == 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_cluster(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 dinamic 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;
}
/*-----------------------------------------------------------------------*/
/* 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 test_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 wc1, wc2;
i = ((dir[LDIR_Ord] & 0xBF) - 1) * 13; /* Offset in the LFN buffer */
s = 0;
do {
if (i >= _MAX_LFN) return FALSE; /* Out of buffer range? */
wc1 = LD_WORD(dir+LfnOfs[s]); /* Get both characters to compare */
wc2 = lfnbuf[i++];
if (IsLower(wc1)) wc1 -= 0x20; /* Compare it (ignore case) */
if (IsLower(wc2)) wc2 -= 0x20;
if (wc1 != wc2) return FALSE;
} while (++s < 13 && wc1); /* Repeat until last char or a NUL char is processed */
return TRUE; /* The LFN entry 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 wchr;
i = ((dir[LDIR_Ord] & 0xBF) - 1) * 13; /* Offset in the LFN buffer */
s = 0;
do {
wchr = LD_WORD(dir+LfnOfs[s]); /* Get an LFN char */
if (!wchr) break; /* End of LFN? */
if (i >= _MAX_LFN) return FALSE; /* Buffer overflow */
lfnbuf[i++] = wchr; /* Store it */
} while (++s < 13); /* Repeat until last char is copied */
if (dir[LDIR_Ord] & 0x40) lfnbuf[i] = 0; /* Put terminator if last LFN entry */
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 wchr;
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; /* Offset in the LFN buffer */
s = wchr = 0;
do {
if (wchr != 0xFFFF) wchr = lfnbuf[i++]; /* Get an effective char */
ST_WORD(dir+LfnOfs[s], wchr); /* Put it */
if (!wchr) wchr = 0xFFFF; /* Padding chars following last char */
} while (++s < 13);
if (wchr == 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
/*-----------------------------------------------------------------------*/
/* 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 a, c, lfen, ord, sum, *dir;
res = dir_seek(dj, 0); /* Rewind directory object */
if (res != FR_OK) return res;
ord = sum = 0xFF; lfen = *(dj->fn+11) & 1;
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 */
a = dir[DIR_Attr] & AM_MASK;
#if _USE_LFN /* LFN configuration */
if (c == 0xE5 || 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 (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 LFN validity. Compare LFN if it is out of 8.3 format */
ord = (c == ord && sum == dir[LDIR_Chksum] && (!lfen || test_lfn(dj->lfn, dir))) ? ord - 1 : 0xFF;
}
} else { /* An SFN entry is found */
if (ord || sum != sum_sfn(dir)) { /* Did not LFN match? */
dj->lfn_idx = 0xFFFF;
ord = 0xFF;
}
if (lfen) { /* Match LFN if it is out of 8.3 format */
if (ord == 0) break;
} else { /* Match SFN if LFN is in 8.3 format */
if (!mem_cmp(dir, dj->fn, 11)) break;
}
}
}
#else /* Non LFN configuration */
if (c != 0xE5 && c != '.' && !(a & 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 <= 2
static
FRESULT dir_read (
DIR *dj /* Pointer to the directory object to store read object name */
)
{
FRESULT res;
BYTE a, c, ord, sum, *dir;
ord = sum = 0xFF;
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 */
a = dir[DIR_Attr] & AM_MASK;
#if _USE_LFN /* LFN configuration */
if (c == 0xE5 || 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 entry? */
dj->lfn_idx = 0xFFFF; /* No LFN. */
break;
}
}
#else /* Non LFN configuration */
if (c != 0xE5 && c != '.' && !(a & 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 (sn[11] & 1) { /* When LFN is out of 8.3 format, generate a numbered name */
fn[11] = 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[11] = sn[11]; dj->lfn = lfn;
}
if (sn[11] & 2) { /* When eliminate LFN, reserve only an SFN entry. */
ne = 1;
} else { /* Otherwise reserve an SFN + LFN entries. */
for (ne = 0; lfn[ne]; ne++) ;
ne = (ne + 25) / 13;
}
/* 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+11) & 0x18; /* Put NT flag */
dj->fs->wflag = 1;
}
}
return res;
}
#endif /* !_FS_READONLY */