ff.c

LPC1788的USBHOST的FATFS移植

/*----------------------------------------------------------------------------/
/  FatFs - FAT file system module  R0.08a                 (C)ChaN, 2010
/-----------------------------------------------------------------------------/
/ 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 terms.
/
/  Copyright (C) 2010, 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) partition.
/ 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 algorithm 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 physical 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. (_FS_TINY)
/                   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.
/
/ May 15,'10 R0.08  Added a memory configuration option. (_USE_LFN = 3)
/                   Added file lock feature. (_FS_SHARE)
/                   Added fast seek feature. (_USE_FASTSEEK)
/                   Changed some types on the API, XCHAR->TCHAR.
/                   Changed fname member in the FILINFO structure on Unicode cfg.
/                   String functions support UTF-8 encoding files on Unicode cfg.
/ Aug 16,'10 R0.08a Added f_getcwd(). (_FS_RPATH = 2)
/                   Added sector erase feature. (_USE_ERASE)
/                   Moved file lock semaphore table from fs object to the bss.
/                   Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'.
/                   Fixed f_mkfs() creates wrong FAT32 volume.
/---------------------------------------------------------------------------*/

#include "ff.h"			/* FatFs configurations and declarations */
#include "diskio.h"		/* Declarations of low level disk I/O functions */


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

   Module Private Definitions

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

#if _FATFS != 8255
#error Wrong include file (ff.h).
#endif


/* Definitions on sector size */
#if _MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096
#error Wrong sector size.
#endif
#if _MAX_SS != 512
#define	SS(fs)	((fs)->ssize)	/* Multiple sector size */
#else
#define	SS(fs)	512U			/* Fixed sector size */
#endif


/* Reentrancy related */
#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); }


/* File shareing feature */
#if _FS_SHARE
#if _FS_READONLY
#error _FS_SHARE must be 0 on read-only cfg.
#endif
typedef struct {
	FATFS *fs;				/* File ID 1, volume (NULL:blank entry) */
	DWORD clu;				/* File ID 2, directory */
	WORD idx;				/* File ID 3, directory index */
	WORD ctr;				/* File open counter, 0:none, 0x01..0xFF:read open count, 0x100:write mode */
} FILESEM;
#endif


/* Misc definitions */
#define LD_CLUST(dir)	(((DWORD)LD_WORD(dir+DIR_FstClusHI)<<16) | LD_WORD(dir+DIR_FstClusLO))
#define ST_CLUST(dir,cl) {ST_WORD(dir+DIR_FstClusLO, cl); ST_WORD(dir+DIR_FstClusHI, (DWORD)cl>>16);}


/* 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		/* 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 */


/* 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 there are incompatibility of the packing option
/ between compilers. */

#define BS_jmpBoot			0
#define BS_OEMName			3
#define BPB_BytsPerSec		11
#define BPB_SecPerClus		13
#define BPB_RsvdSecCnt		14
#define BPB_NumFATs			16
#define BPB_RootEntCnt		17
#define BPB_TotSec16		19
#define BPB_Media			21
#define BPB_FATSz16			22
#define BPB_SecPerTrk		24
#define BPB_NumHeads		26
#define BPB_HiddSec			28
#define BPB_TotSec32		32
#define BS_DrvNum			36
#define BS_BootSig			38
#define BS_VolID			39
#define BS_VolLab			43
#define BS_FilSysType		54
#define BPB_FATSz32			36
#define BPB_ExtFlags		40
#define BPB_FSVer			42
#define BPB_RootClus		44
#define BPB_FSInfo			48
#define BPB_BkBootSec		50
#define BS_DrvNum32			64
#define BS_BootSig32		66
#define BS_VolID32			67
#define BS_VolLab32			71
#define BS_FilSysType32		82
#define	FSI_LeadSig			0
#define	FSI_StrucSig		484
#define	FSI_Free_Count		488
#define	FSI_Nxt_Free		492
#define MBR_Table			446
#define BS_55AA				510

#define	DIR_Name			0
#define	DIR_Attr			11
#define	DIR_NTres			12
#define	DIR_CrtTime			14
#define	DIR_CrtDate			16
#define	DIR_FstClusHI		20
#define	DIR_WrtTime			22
#define	DIR_WrtDate			24
#define	DIR_FstClusLO		26
#define	DIR_FileSize		28
#define	LDIR_Ord			0
#define	LDIR_Attr			11
#define	LDIR_Type			12
#define	LDIR_Chksum			13
#define	LDIR_FstClusLO		26



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