ff.c

stm32 红外万年历

#else
#error Unknown code page

#endif


/* Character code support macros */
#define IsUpper(c)	(((c)>='A')&&((c)<='Z'))
#define IsLower(c)	(((c)>='a')&&((c)<='z'))
#define IsDigit(c)	(((c)>='0')&&((c)<='9'))

#if _DF1S		/* Code page is DBCS */

#ifdef _DF2S	/* Two 1st byte areas */
#define IsDBCS1(c)	(((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E) || ((BYTE)(c) >= _DF2S && (BYTE)(c) <= _DF2E))
#else			/* One 1st byte area */
#define IsDBCS1(c)	((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E)
#endif

#ifdef _DS3S	/* Three 2nd byte areas */
#define IsDBCS2(c)	(((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E) || ((BYTE)(c) >= _DS3S && (BYTE)(c) <= _DS3E))
#else			/* Two 2nd byte areas */
#define IsDBCS2(c)	(((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E))
#endif

#else			/* Code page is SBCS */

#define IsDBCS1(c)	0
#define IsDBCS2(c)	0

#endif /* _DF1S */


/* Name status flags */
#define NS			11		/* Index of name status byte in fn[] */
#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 */


/* FAT sub-type boundaries */
/* Note that the FAT spec by Microsoft says 4085 but Windows works with 4087! */
#define MIN_FAT16	4086	/* Minimum number of clusters for FAT16 */
#define	MIN_FAT32	65526	/* Minimum number of clusters for FAT32 */


/* FatFs refers the members in the FAT structures as byte array instead of
/ structure member because the structure is not binary compatible between
/ different platforms */

#define BS_jmpBoot			0	/* Jump instruction (3) */
#define BS_OEMName			3	/* OEM name (8) */
#define BPB_BytsPerSec		11	/* Sector size [byte] (2) */
#define BPB_SecPerClus		13	/* Cluster size [sector] (1) */
#define BPB_RsvdSecCnt		14	/* Size of reserved area [sector] (2) */
#define BPB_NumFATs			16	/* Number of FAT copies (1) */
#define BPB_RootEntCnt		17	/* Number of root dir entries for FAT12/16 (2) */
#define BPB_TotSec16		19	/* Volume size [sector] (2) */
#define BPB_Media			21	/* Media descriptor (1) */
#define BPB_FATSz16			22	/* FAT size [sector] (2) */
#define BPB_SecPerTrk		24	/* Track size [sector] (2) */
#define BPB_NumHeads		26	/* Number of heads (2) */
#define BPB_HiddSec			28	/* Number of special hidden sectors (4) */
#define BPB_TotSec32		32	/* Volume size [sector] (4) */
#define BS_DrvNum			36	/* Physical drive number (2) */
#define BS_BootSig			38	/* Extended boot signature (1) */
#define BS_VolID			39	/* Volume serial number (4) */
#define BS_VolLab			43	/* Volume label (8) */
#define BS_FilSysType		54	/* File system type (1) */
#define BPB_FATSz32			36	/* FAT size [sector] (4) */
#define BPB_ExtFlags		40	/* Extended flags (2) */
#define BPB_FSVer			42	/* File system version (2) */
#define BPB_RootClus		44	/* Root dir first cluster (4) */
#define BPB_FSInfo			48	/* Offset of FSInfo sector (2) */
#define BPB_BkBootSec		50	/* Offset of backup boot sectot (2) */
#define BS_DrvNum32			64	/* Physical drive number (2) */
#define BS_BootSig32		66	/* Extended boot signature (1) */
#define BS_VolID32			67	/* Volume serial number (4) */
#define BS_VolLab32			71	/* Volume label (8) */
#define BS_FilSysType32		82	/* File system type (1) */
#define	FSI_LeadSig			0	/* FSI: Leading signature (4) */
#define	FSI_StrucSig		484	/* FSI: Structure signature (4) */
#define	FSI_Free_Count		488	/* FSI: Number of free clusters (4) */
#define	FSI_Nxt_Free		492	/* FSI: Last allocated cluster (4) */
#define MBR_Table			446	/* MBR: Partition table offset (2) */
#define	SZ_PTE				16	/* MBR: Size of a partition table entry */
#define BS_55AA				510	/* Boot sector signature (2) */

#define	DIR_Name			0	/* Short file name (11) */
#define	DIR_Attr			11	/* Attribute (1) */
#define	DIR_NTres			12	/* NT flag (1) */
#define	DIR_CrtTime			14	/* Created time (2) */
#define	DIR_CrtDate			16	/* Created date (2) */
#define	DIR_FstClusHI		20	/* Higher 16-bit of first cluster (2) */
#define	DIR_WrtTime			22	/* Modified time (2) */
#define	DIR_WrtDate			24	/* Modified date (2) */
#define	DIR_FstClusLO		26	/* Lower 16-bit of first cluster (2) */
#define	DIR_FileSize		28	/* File size (4) */
#define	LDIR_Ord			0	/* LFN entry order and LLE flag (1) */
#define	LDIR_Attr			11	/* LFN attribute (1) */
#define	LDIR_Type			12	/* LFN type (1) */
#define	LDIR_Chksum			13	/* Sum of corresponding SFN entry */
#define	LDIR_FstClusLO		26	/* Filled by zero (0) */
#define	SZ_DIR				32		/* Size of a directory entry */
#define	LLE					0x40	/* Last long entry flag in LDIR_Ord */
#define	DDE					0xE5	/* Deleted directory enrty mark in DIR_Name[0] */
#define	NDDE				0x05	/* Replacement of a character collides with DDE */


/*------------------------------------------------------------*/
/* Work area                                                  */

#if _VOLUMES
static
FATFS *FatFs[_VOLUMES];	/* Pointer to the file system objects (logical drives) */
#else
#error Number of drives must not be 0.
#endif

static
WORD Fsid;				/* File system mount ID */

#if _FS_RPATH
static
BYTE CurrVol;			/* Current drive */
#endif

#if _FS_SHARE
static
FILESEM	Files[_FS_SHARE];	/* File lock semaphores */
#endif

#if _USE_LFN == 0			/* No LFN */
#define	DEF_NAMEBUF			BYTE sfn[12]
#define INIT_BUF(dobj)		(dobj).fn = sfn
#define	FREE_BUF()

#elif _USE_LFN == 1			/* LFN with static LFN working buffer */
static WCHAR LfnBuf[_MAX_LFN+1];
#define	DEF_NAMEBUF			BYTE sfn[12]
#define INIT_BUF(dobj)		{ (dobj).fn = sfn; (dobj).lfn = LfnBuf; }
#define	FREE_BUF()

#elif _USE_LFN == 2 		/* LFN with dynamic LFN working buffer on the stack */
#define	DEF_NAMEBUF			BYTE sfn[12]; WCHAR lbuf[_MAX_LFN+1]
#define INIT_BUF(dobj)		{ (dobj).fn = sfn; (dobj).lfn = lbuf; }
#define	FREE_BUF()

#elif _USE_LFN == 3 		/* LFN with dynamic LFN working buffer on the heap */
#define	DEF_NAMEBUF			BYTE sfn[12]; WCHAR *lfn
#define INIT_BUF(dobj)		{ lfn = ff_memalloc((_MAX_LFN + 1) * 2); \
							  if (!lfn) LEAVE_FF((dobj).fs, FR_NOT_ENOUGH_CORE); \
							  (dobj).lfn = lfn;	(dobj).fn = sfn; }
#define	FREE_BUF()			ff_memfree(lfn)

#else
#error Wrong LFN configuration.
#endif




/*--------------------------------------------------------------------------

   Module Private Functions

---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* String functions                                                      */
/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static
void mem_cpy (void* dst, const void* src, UINT cnt) {
	BYTE *d = (BYTE*)dst;
	const BYTE *s = (const BYTE*)src;

#if _WORD_ACCESS == 1
	while (cnt >= sizeof(int)) {
		*(int*)d = *(int*)s;
		d += sizeof(int); s += sizeof(int);
		cnt -= sizeof(int);
	}
#endif
	while (cnt--)
		*d++ = *s++;
}

/* Fill memory */
static
void mem_set (void* dst, int val, UINT cnt) {
	BYTE *d = (BYTE*)dst;

	while (cnt--)
		*d++ = (BYTE)val;
}

/* Compare memory to memory */
static
int mem_cmp (const void* dst, const void* src, UINT cnt) {
	const BYTE *d = (const BYTE *)dst, *s = (const BYTE *)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
int 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



/*-----------------------------------------------------------------------*/
/* File shareing control functions                                       */
/*-----------------------------------------------------------------------*/
#if _FS_SHARE

static
FRESULT chk_lock (	/* Check if the file can be accessed */
	DIR* dj,		/* Directory object pointing the file to be checked */
	int acc			/* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
)
{
	UINT i, be;

	/* Search file semaphore table */
	for (i = be = 0; i < _FS_SHARE; i++) {
		if (Files[i].fs) {	/* Existing entry */
			if (Files[i].fs == dj->fs &&	 	/* Check if the file matched with an open file */
				Files[i].clu == dj->sclust &&
				Files[i].idx == dj->index) break;
		} else {			/* Blank entry */
			be++;
		}
	}
	if (i == _FS_SHARE)	/* The file is not opened */
		return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;	/* Is there a blank entry for new file? */

	/* The file has been opened. Reject any open against writing file and all write mode open */
	return (acc || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}


static
int enq_lock (	/* Check if an entry is available for a new file */
	FATFS* fs	/* File system object */
)
{
	UINT i;

	for (i = 0; i < _FS_SHARE && Files[i].fs; i++) ;
	return (i == _FS_SHARE) ? 0 : 1;
}


static
UINT inc_lock (	/* Increment file open counter and returns its index (0:int error) */
	DIR* dj,	/* Directory object pointing the file to register or increment */
	int acc		/* Desired access mode (0:Read, !0:Write) */
)
{
	UINT i;


	for (i = 0; i < _FS_SHARE; i++) {	/* Find the file */
		if (Files[i].fs == dj->fs &&
			Files[i].clu == dj->sclust &&
			Files[i].idx == dj->index) break;
	}

	if (i == _FS_SHARE) {				/* Not opened. Register it as new. */
		for (i = 0; i < _FS_SHARE && Files[i].fs; i++) ;
		if (i == _FS_SHARE) return 0;	/* No space to register (int err) */
		Files[i].fs = dj->fs;
		Files[i].clu = dj->sclust;
		Files[i].idx = dj->index;
		Files[i].ctr = 0;
	}

	if (acc && Files[i].ctr) return 0;	/* Access violation (int err) */

	Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;	/* Set semaphore value */

	return i + 1;
}


static
FRESULT dec_lock (	/* Decrement file open counter */
	UINT i			/* Semaphore index */
)
{
	WORD n;
	FRESULT res;


	if (--i < _FS_SHARE) {
		n = Files[i].ctr;
		if (n == 0x100) n = 0;
		if (n) n--;