ff.c

stm32 红外万年历

		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 == DDE || ((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 & LLE) {		/* Is it start of LFN sequence? */
						sum = dir[LDIR_Chksum];
						c &= ~LLE; 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, 0);		/* Next entry */
	} while (res == FR_OK);

	return res;
}




/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1
static
FRESULT dir_read (
	DIR *dj			/* Pointer to the directory object that pointing the entry to be read */
)
{
	FRESULT res;
	BYTE c, *dir;
#if _USE_LFN
	BYTE a, ord = 0xFF, sum = 0xFF;
#endif

	res = FR_NO_FILE;
	while (dj->sect) {
		res = move_window(dj->fs, dj->sect);
		if (res != FR_OK) break;
		dir = dj->dir;					/* Ptr to the directory entry of current index */
		c = dir[DIR_Name];
		if (c == 0) { res = FR_NO_FILE; break; }	/* Reached to end of table */
#if _USE_LFN	/* LFN configuration */
		a = dir[DIR_Attr] & AM_MASK;
		if (c == DDE || (!_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 & LLE) {			/* Is it start of LFN sequence? */
					sum = dir[LDIR_Chksum];
					c &= ~LLE; 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 != DDE && (_FS_RPATH || c != '.') && !(dir[DIR_Attr] & AM_VOL))	/* Is it a valid entry? */
			break;
#endif
		res = dir_next(dj, 0);				/* Next entry */
		if (res != FR_OK) break;
	}

	if (res != FR_OK) dj->sect = 0;

	return res;
}
#endif



/*-----------------------------------------------------------------------*/
/* Register an object to the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT dir_register (	/* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */
	DIR *dj				/* Target directory with object name to be created */
)
{
	FRESULT res;
	BYTE c, *dir;
#if _USE_LFN	/* LFN configuration */
	WORD n, ne, is;
	BYTE sn[12], *fn, sum;
	WCHAR *lfn;


	fn = dj->fn; lfn = dj->lfn;
	mem_cpy(sn, fn, 12);

	if (_FS_RPATH && (sn[NS] & NS_DOT))		/* Cannot create dot entry */
		return FR_INVALID_NAME;

	if (sn[NS] & NS_LOSS) {			/* When LFN is out of 8.3 format, generate a numbered name */
		fn[NS] = 0; dj->lfn = 0;			/* 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 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_sdi(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 == DDE || c == 0) {	/* Is it a blank entry? */
			if (n == 0) is = dj->index;	/* First index of the contiguous entry */
			if (++n == ne) break;	/* A contiguous entry that required count is found */
		} else {
			n = 0;					/* Not a blank entry. Restart to search */
		}
		res = dir_next(dj, 1);		/* Next entry with table stretch */
	} while (res == FR_OK);

	if (res == FR_OK && ne > 1) {	/* Initialize LFN entry if needed */
		res = dir_sdi(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, 0);	/* Next entry */
			} while (res == FR_OK && --ne);
		}
	}

#else	/* Non LFN configuration */
	res = dir_sdi(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 == DDE || c == 0) break;	/* Is it a blank entry? */
			res = dir_next(dj, 1);			/* Next entry with table stretch */
		} 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, SZ_DIR);	/* Clean the entry */
			mem_cpy(dir, dj->fn, 11);	/* Put SFN */
#if _USE_LFN
			dir[DIR_NTres] = *(dj->fn+NS) & (NS_BODY | NS_EXT);	/* Put NT flag */
#endif
			dj->fs->wflag = 1;
		}
	}

	return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Remove an object from the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY && !_FS_MINIMIZE
static
FRESULT dir_remove (	/* FR_OK: Successful, FR_DISK_ERR: A disk error */
	DIR *dj				/* Directory object pointing the entry to be removed */
)
{
	FRESULT res;
#if _USE_LFN	/* LFN configuration */
	WORD i;

	i = dj->index;	/* SFN index */
	res = dir_sdi(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 = DDE;			/* 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, 0);		/* Next entry */
		} while (res == FR_OK);
		if (res == FR_NO_FILE) res = FR_INT_ERR;
	}

#else			/* Non LFN configuration */
	res = dir_sdi(dj, dj->index);
	if (res == FR_OK) {
		res = move_window(dj->fs, dj->sect);
		if (res == FR_OK) {
			*dj->dir = DDE;			/* Mark the entry "deleted" */
			dj->fs->wflag = 1;
		}
	}
#endif

	return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Pick a segment and create the object name in directory form           */
/*-----------------------------------------------------------------------*/

static
FRESULT create_name (
	DIR *dj,			/* Pointer to the directory object */
	const TCHAR **path	/* Pointer to pointer to the segment in the path string */
)
{
#ifdef _EXCVT
	static const BYTE excvt[] = _EXCVT;	/* Upper conversion table for extended chars */
#endif

#if _USE_LFN	/* LFN configuration */
	BYTE b, cf;
	WCHAR w, *lfn;
	UINT i, ni, si, di;
	const TCHAR *p;

	/* Create LFN in Unicode */
	for (p = *path; *p == '/' || *p == '\\'; p++) ;	/* Strip duplicated separator */
	lfn = dj->lfn;
	si = di = 0;
	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)) {				/* Check if it is a DBC 1st byte (always false on SBCS cfg) */
			b = (BYTE)p[si++];			/* Get 2nd byte */
			if (!IsDBCS2(b))
				return FR_INVALID_NAME;	/* Reject invalid sequence */
			w = (w << 8) + b;			/* Create a DBC */
		}
		w = ff_convert(w, 1);			/* Convert ANSI/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];						/* Return 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 nul 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 end 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 = excvt[w - 0x80];	/* Convert extended char to upper (SBCS) */
#else
			w = ff_convert(ff_wto