forked

Dependents:   Lab3

Fork of FatFileSystemCpp by Igor Skochinsky

Revision:
2:5cdf6d5c3b68
Parent:
0:6ceefe1c53e4
--- a/ff.h	Mon Jul 30 13:45:05 2012 +0000
+++ b/ff.h	Wed Mar 06 00:19:18 2013 +0000
@@ -15,14 +15,14 @@
 /----------------------------------------------------------------------------*/
 
 #ifndef _FATFS
-#define _FATFS	6502	/* Revision ID */
+#define _FATFS    6502    /* Revision ID */
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include "integer.h"	/* Basic integer types */
-#include "ffconf.h"		/* FatFs configuration options */
+#include "integer.h"    /* Basic integer types */
+#include "ffconf.h"        /* FatFs configuration options */
 
 #if _FATFS != _FFCONF
 #error Wrong configuration file (ffconf.h).
@@ -32,18 +32,18 @@
 
 /* Definitions of volume management */
 
-#if _MULTI_PARTITION		/* Multiple partition configuration */
+#if _MULTI_PARTITION        /* Multiple partition configuration */
 typedef struct {
-	BYTE pd;	/* Physical drive number */
-	BYTE pt;	/* Partition: 0:Auto detect, 1-4:Forced partition) */
+    BYTE pd;    /* Physical drive number */
+    BYTE pt;    /* Partition: 0:Auto detect, 1-4:Forced partition) */
 } PARTITION;
-extern PARTITION VolToPart[];	/* Volume - Partition resolution table */
-#define LD2PD(vol) (VolToPart[vol].pd)	/* Get physical drive number */
-#define LD2PT(vol) (VolToPart[vol].pt)	/* Get partition index */
+extern PARTITION VolToPart[];    /* Volume - Partition resolution table */
+#define LD2PD(vol) (VolToPart[vol].pd)    /* Get physical drive number */
+#define LD2PT(vol) (VolToPart[vol].pt)    /* Get partition index */
 
-#else						/* Single partition configuration */
-#define LD2PD(vol) (vol)	/* Each logical drive is bound to the same physical drive number */
-#define LD2PT(vol) 0		/* Always mounts the 1st partition or in SFD */
+#else                        /* Single partition configuration */
+#define LD2PD(vol) (vol)    /* Each logical drive is bound to the same physical drive number */
+#define LD2PT(vol) 0        /* Always mounts the 1st partition or in SFD */
 
 #endif
 
@@ -51,7 +51,7 @@
 
 /* Type of path name strings on FatFs API */
 
-#if _LFN_UNICODE			/* Unicode string */
+#if _LFN_UNICODE            /* Unicode string */
 #if !_USE_LFN
 #error _LFN_UNICODE must be 0 in non-LFN cfg.
 #endif
@@ -61,7 +61,7 @@
 #define _TEXT(x) L ## x
 #endif
 
-#else						/* ANSI/OEM string */
+#else                        /* ANSI/OEM string */
 #ifndef _INC_TCHAR
 typedef char TCHAR;
 #define _T(x) x
@@ -75,35 +75,35 @@
 /* File system object structure (FATFS) */
 
 typedef struct {
-	BYTE	fs_type;		/* FAT sub-type (0:Not mounted) */
-	BYTE	drv;			/* Physical drive number */
-	BYTE	csize;			/* Sectors per cluster (1,2,4...128) */
-	BYTE	n_fats;			/* Number of FAT copies (1,2) */
-	BYTE	wflag;			/* win[] dirty flag (1:must be written back) */
-	BYTE	fsi_flag;		/* fsinfo dirty flag (1:must be written back) */
-	WORD	id;				/* File system mount ID */
-	WORD	n_rootdir;		/* Number of root directory entries (FAT12/16) */
+    BYTE    fs_type;        /* FAT sub-type (0:Not mounted) */
+    BYTE    drv;            /* Physical drive number */
+    BYTE    csize;            /* Sectors per cluster (1,2,4...128) */
+    BYTE    n_fats;            /* Number of FAT copies (1,2) */
+    BYTE    wflag;            /* win[] dirty flag (1:must be written back) */
+    BYTE    fsi_flag;        /* fsinfo dirty flag (1:must be written back) */
+    WORD    id;                /* File system mount ID */
+    WORD    n_rootdir;        /* Number of root directory entries (FAT12/16) */
 #if _MAX_SS != 512
-	WORD	ssize;			/* Bytes per sector (512, 1024, 2048 or 4096) */
+    WORD    ssize;            /* Bytes per sector (512, 1024, 2048 or 4096) */
 #endif
 #if _FS_REENTRANT
-	_SYNC_t	sobj;			/* Identifier of sync object */
+    _SYNC_t    sobj;            /* Identifier of sync object */
 #endif
 #if !_FS_READONLY
-	DWORD	last_clust;		/* Last allocated cluster */
-	DWORD	free_clust;		/* Number of free clusters */
-	DWORD	fsi_sector;		/* fsinfo sector (FAT32) */
+    DWORD    last_clust;        /* Last allocated cluster */
+    DWORD    free_clust;        /* Number of free clusters */
+    DWORD    fsi_sector;        /* fsinfo sector (FAT32) */
 #endif
 #if _FS_RPATH
-	DWORD	cdir;			/* Current directory start cluster (0:root) */
+    DWORD    cdir;            /* Current directory start cluster (0:root) */
 #endif
-	DWORD	n_fatent;		/* Number of FAT entries (= number of clusters + 2) */
-	DWORD	fsize;			/* Sectors per FAT */
-	DWORD	fatbase;		/* FAT start sector */
-	DWORD	dirbase;		/* Root directory start sector (FAT32:Cluster#) */
-	DWORD	database;		/* Data start sector */
-	DWORD	winsect;		/* Current sector appearing in the win[] */
-	BYTE	win[_MAX_SS];	/* Disk access window for Directory, FAT (and Data on tiny cfg) */
+    DWORD    n_fatent;        /* Number of FAT entries (= number of clusters + 2) */
+    DWORD    fsize;            /* Sectors per FAT */
+    DWORD    fatbase;        /* FAT start sector */
+    DWORD    dirbase;        /* Root directory start sector (FAT32:Cluster#) */
+    DWORD    database;        /* Data start sector */
+    DWORD    winsect;        /* Current sector appearing in the win[] */
+    BYTE    win[_MAX_SS];    /* Disk access window for Directory, FAT (and Data on tiny cfg) */
 } FATFS;
 
 
@@ -111,27 +111,27 @@
 /* File object structure (FIL) */
 
 typedef struct {
-	FATFS*	fs;				/* Pointer to the owner file system object */
-	WORD	id;				/* Owner file system mount ID */
-	BYTE	flag;			/* File status flags */
-	BYTE	pad1;
-	DWORD	fptr;			/* File read/write pointer (0 on file open) */
-	DWORD	fsize;			/* File size */
-	DWORD	sclust;			/* File start cluster (0 when fsize==0) */
-	DWORD	clust;			/* Current cluster */
-	DWORD	dsect;			/* Current data sector */
+    FATFS*    fs;                /* Pointer to the owner file system object */
+    WORD    id;                /* Owner file system mount ID */
+    BYTE    flag;            /* File status flags */
+    BYTE    pad1;
+    DWORD    fptr;            /* File read/write pointer (0 on file open) */
+    DWORD    fsize;            /* File size */
+    DWORD    sclust;            /* File start cluster (0 when fsize==0) */
+    DWORD    clust;            /* Current cluster */
+    DWORD    dsect;            /* Current data sector */
 #if !_FS_READONLY
-	DWORD	dir_sect;		/* Sector containing the directory entry */
-	BYTE*	dir_ptr;		/* Ponter to the directory entry in the window */
+    DWORD    dir_sect;        /* Sector containing the directory entry */
+    BYTE*    dir_ptr;        /* Ponter to the directory entry in the window */
 #endif
 #if _USE_FASTSEEK
-	DWORD*	cltbl;			/* Pointer to the cluster link map table (null on file open) */
+    DWORD*    cltbl;            /* Pointer to the cluster link map table (null on file open) */
 #endif
 #if _FS_SHARE
-	UINT	lockid;			/* File lock ID (index of file semaphore table) */
+    UINT    lockid;            /* File lock ID (index of file semaphore table) */
 #endif
 #if !_FS_TINY
-	BYTE	buf[_MAX_SS];	/* File data read/write buffer */
+    BYTE    buf[_MAX_SS];    /* File data read/write buffer */
 #endif
 } FIL;
 
@@ -140,17 +140,17 @@
 /* Directory object structure (FATFS_DIR) */
 
 typedef struct {
-	FATFS*	fs;				/* Pointer to the owner file system object */
-	WORD	id;				/* Owner file system mount ID */
-	WORD	index;			/* Current read/write index number */
-	DWORD	sclust;			/* Table start cluster (0:Root dir) */
-	DWORD	clust;			/* Current cluster */
-	DWORD	sect;			/* Current sector */
-	BYTE*	dir;			/* Pointer to the current SFN entry in the win[] */
-	BYTE*	fn;				/* Pointer to the SFN (in/out) {file[8],ext[3],status[1]} */
+    FATFS*    fs;                /* Pointer to the owner file system object */
+    WORD    id;                /* Owner file system mount ID */
+    WORD    index;            /* Current read/write index number */
+    DWORD    sclust;            /* Table start cluster (0:Root dir) */
+    DWORD    clust;            /* Current cluster */
+    DWORD    sect;            /* Current sector */
+    BYTE*    dir;            /* Pointer to the current SFN entry in the win[] */
+    BYTE*    fn;                /* Pointer to the SFN (in/out) {file[8],ext[3],status[1]} */
 #if _USE_LFN
-	WCHAR*	lfn;			/* Pointer to the LFN working buffer */
-	WORD	lfn_idx;		/* Last matched LFN index number (0xFFFF:No LFN) */
+    WCHAR*    lfn;            /* Pointer to the LFN working buffer */
+    WORD    lfn_idx;        /* Last matched LFN index number (0xFFFF:No LFN) */
 #endif
 } FATFS_DIR;
 
@@ -159,14 +159,14 @@
 /* File status structure (FILINFO) */
 
 typedef struct {
-	DWORD	fsize;			/* File size */
-	WORD	fdate;			/* Last modified date */
-	WORD	ftime;			/* Last modified time */
-	BYTE	fattrib;		/* Attribute */
-	TCHAR	fname[13];		/* Short file name (8.3 format) */
+    DWORD    fsize;            /* File size */
+    WORD    fdate;            /* Last modified date */
+    WORD    ftime;            /* Last modified time */
+    BYTE    fattrib;        /* Attribute */
+    TCHAR    fname[13];        /* Short file name (8.3 format) */
 #if _USE_LFN
-	TCHAR*	lfname;			/* Pointer to the LFN buffer */
-	UINT 	lfsize;			/* Size of LFN buffer in TCHAR */
+    TCHAR*    lfname;            /* Pointer to the LFN buffer */
+    UINT     lfsize;            /* Size of LFN buffer in TCHAR */
 #endif
 } FILINFO;
 
@@ -175,26 +175,26 @@
 /* File function return code (FRESULT) */
 
 typedef enum {
-	FR_OK = 0,				/* (0) Succeeded */
-	FR_DISK_ERR,			/* (1) A hard error occured in the low level disk I/O layer */
-	FR_INT_ERR,				/* (2) Assertion failed */
-	FR_NOT_READY,			/* (3) The physical drive cannot work */
-	FR_NO_FILE,				/* (4) Could not find the file */
-	FR_NO_PATH,				/* (5) Could not find the path */
-	FR_INVALID_NAME,		/* (6) The path name format is invalid */
-	FR_DENIED,				/* (7) Acces denied due to prohibited access or directory full */
-	FR_EXIST,				/* (8) Acces denied due to prohibited access */
-	FR_INVALID_OBJECT,		/* (9) The file/directory object is invalid */
-	FR_WRITE_PROTECTED,		/* (10) The physical drive is write protected */
-	FR_INVALID_DRIVE,		/* (11) The logical drive number is invalid */
-	FR_NOT_ENABLED,			/* (12) The volume has no work area */
-	FR_NO_FILESYSTEM,		/* (13) There is no valid FAT volume */
-	FR_MKFS_ABORTED,		/* (14) The f_mkfs() aborted due to any parameter error */
-	FR_TIMEOUT,				/* (15) Could not get a grant to access the volume within defined period */
-	FR_LOCKED,				/* (16) The operation is rejected according to the file shareing policy */
-	FR_NOT_ENOUGH_CORE,		/* (17) LFN working buffer could not be allocated */
-	FR_TOO_MANY_OPEN_FILES,	/* (18) Number of open files > _FS_SHARE */
-	FR_INVALID_PARAMETER	/* (19) Given parameter is invalid */
+    FR_OK = 0,                /* (0) Succeeded */
+    FR_DISK_ERR,            /* (1) A hard error occured in the low level disk I/O layer */
+    FR_INT_ERR,                /* (2) Assertion failed */
+    FR_NOT_READY,            /* (3) The physical drive cannot work */
+    FR_NO_FILE,                /* (4) Could not find the file */
+    FR_NO_PATH,                /* (5) Could not find the path */
+    FR_INVALID_NAME,        /* (6) The path name format is invalid */
+    FR_DENIED,                /* (7) Acces denied due to prohibited access or directory full */
+    FR_EXIST,                /* (8) Acces denied due to prohibited access */
+    FR_INVALID_OBJECT,        /* (9) The file/directory object is invalid */
+    FR_WRITE_PROTECTED,        /* (10) The physical drive is write protected */
+    FR_INVALID_DRIVE,        /* (11) The logical drive number is invalid */
+    FR_NOT_ENABLED,            /* (12) The volume has no work area */
+    FR_NO_FILESYSTEM,        /* (13) There is no valid FAT volume */
+    FR_MKFS_ABORTED,        /* (14) The f_mkfs() aborted due to any parameter error */
+    FR_TIMEOUT,                /* (15) Could not get a grant to access the volume within defined period */
+    FR_LOCKED,                /* (16) The operation is rejected according to the file shareing policy */
+    FR_NOT_ENOUGH_CORE,        /* (17) LFN working buffer could not be allocated */
+    FR_TOO_MANY_OPEN_FILES,    /* (18) Number of open files > _FS_SHARE */
+    FR_INVALID_PARAMETER    /* (19) Given parameter is invalid */
 } FRESULT;
 
 
@@ -202,33 +202,33 @@
 /*--------------------------------------------------------------*/
 /* FatFs module application interface                           */
 
-FRESULT f_mount (BYTE, FATFS*);						/* Mount/Unmount a logical drive */
-FRESULT f_open (FIL*, const TCHAR*, BYTE);			/* Open or create a file */
-FRESULT f_read (FIL*, void*, UINT, UINT*);			/* Read data from a file */
-FRESULT f_lseek (FIL*, DWORD);						/* Move file pointer of a file object */
-FRESULT f_close (FIL*);								/* Close an open file object */
-FRESULT f_opendir (FATFS_DIR*, const TCHAR*);				/* Open an existing directory */
-FRESULT f_readdir (FATFS_DIR*, FILINFO*);					/* Read a directory item */
-FRESULT f_stat (const TCHAR*, FILINFO*);			/* Get file status */
-FRESULT f_write (FIL*, const void*, UINT, UINT*);	/* Write data to a file */
-FRESULT f_getfree (const TCHAR*, DWORD*, FATFS**);	/* Get number of free clusters on the drive */
-FRESULT f_truncate (FIL*);							/* Truncate file */
-FRESULT f_sync (FIL*);								/* Flush cached data of a writing file */
-FRESULT f_unlink (const TCHAR*);					/* Delete an existing file or directory */
-FRESULT	f_mkdir (const TCHAR*);						/* Create a new directory */
-FRESULT f_chmod (const TCHAR*, BYTE, BYTE);			/* Change attriburte of the file/dir */
-FRESULT f_utime (const TCHAR*, const FILINFO*);		/* Change timestamp of the file/dir */
-FRESULT f_rename (const TCHAR*, const TCHAR*);		/* Rename/Move a file or directory */
-FRESULT f_chdrive (BYTE);							/* Change current drive */
-FRESULT f_chdir (const TCHAR*);						/* Change current directory */
-FRESULT f_getcwd (TCHAR*, UINT);					/* Get current directory */
-FRESULT f_forward (FIL*, UINT(*)(const BYTE*,UINT), UINT, UINT*);	/* Forward data to the stream */
-FRESULT f_mkfs (BYTE, BYTE, UINT);					/* Create a file system on the drive */
-FRESULT	f_fdisk (BYTE, const DWORD[], void*);		/* Divide a physical drive into some partitions */
-int f_putc (TCHAR, FIL*);							/* Put a character to the file */
-int f_puts (const TCHAR*, FIL*);					/* Put a string to the file */
-int f_printf (FIL*, const TCHAR*, ...);				/* Put a formatted string to the file */
-TCHAR* f_gets (TCHAR*, int, FIL*);					/* Get a string from the file */
+FRESULT f_mount (BYTE, FATFS*);                        /* Mount/Unmount a logical drive */
+FRESULT f_open (FIL*, const TCHAR*, BYTE);            /* Open or create a file */
+FRESULT f_read (FIL*, void*, UINT, UINT*);            /* Read data from a file */
+FRESULT f_lseek (FIL*, DWORD);                        /* Move file pointer of a file object */
+FRESULT f_close (FIL*);                                /* Close an open file object */
+FRESULT f_opendir (FATFS_DIR*, const TCHAR*);                /* Open an existing directory */
+FRESULT f_readdir (FATFS_DIR*, FILINFO*);                    /* Read a directory item */
+FRESULT f_stat (const TCHAR*, FILINFO*);            /* Get file status */
+FRESULT f_write (FIL*, const void*, UINT, UINT*);    /* Write data to a file */
+FRESULT f_getfree (const TCHAR*, DWORD*, FATFS**);    /* Get number of free clusters on the drive */
+FRESULT f_truncate (FIL*);                            /* Truncate file */
+FRESULT f_sync (FIL*);                                /* Flush cached data of a writing file */
+FRESULT f_unlink (const TCHAR*);                    /* Delete an existing file or directory */
+FRESULT    f_mkdir (const TCHAR*);                        /* Create a new directory */
+FRESULT f_chmod (const TCHAR*, BYTE, BYTE);            /* Change attriburte of the file/dir */
+FRESULT f_utime (const TCHAR*, const FILINFO*);        /* Change timestamp of the file/dir */
+FRESULT f_rename (const TCHAR*, const TCHAR*);        /* Rename/Move a file or directory */
+FRESULT f_chdrive (BYTE);                            /* Change current drive */
+FRESULT f_chdir (const TCHAR*);                        /* Change current directory */
+FRESULT f_getcwd (TCHAR*, UINT);                    /* Get current directory */
+FRESULT f_forward (FIL*, UINT(*)(const BYTE*,UINT), UINT, UINT*);    /* Forward data to the stream */
+FRESULT f_mkfs (BYTE, BYTE, UINT);                    /* Create a file system on the drive */
+FRESULT    f_fdisk (BYTE, const DWORD[], void*);        /* Divide a physical drive into some partitions */
+int f_putc (TCHAR, FIL*);                            /* Put a character to the file */
+int f_puts (const TCHAR*, FIL*);                    /* Put a string to the file */
+int f_printf (FIL*, const TCHAR*, ...);                /* Put a formatted string to the file */
+TCHAR* f_gets (TCHAR*, int, FIL*);                    /* Get a string from the file */
 
 #define f_eof(fp) (((fp)->fptr == (fp)->fsize) ? 1 : 0)
 #define f_error(fp) (((fp)->flag & FA__ERROR) ? 1 : 0)
@@ -251,21 +251,21 @@
 #endif
 
 /* Unicode support functions */
-#if _USE_LFN						/* Unicode - OEM code conversion */
-WCHAR ff_convert (WCHAR, UINT);		/* OEM-Unicode bidirectional conversion */
-WCHAR ff_wtoupper (WCHAR);			/* Unicode upper-case conversion */
-#if _USE_LFN == 3					/* Memory functions */
-void* ff_memalloc (UINT);			/* Allocate memory block */
-void ff_memfree (void*);			/* Free memory block */
+#if _USE_LFN                        /* Unicode - OEM code conversion */
+WCHAR ff_convert (WCHAR, UINT);        /* OEM-Unicode bidirectional conversion */
+WCHAR ff_wtoupper (WCHAR);            /* Unicode upper-case conversion */
+#if _USE_LFN == 3                    /* Memory functions */
+void* ff_memalloc (UINT);            /* Allocate memory block */
+void ff_memfree (void*);            /* Free memory block */
 #endif
 #endif
 
 /* Sync functions */
 #if _FS_REENTRANT
 int ff_cre_syncobj (BYTE, _SYNC_t*);/* Create a sync object */
-int ff_req_grant (_SYNC_t);			/* Lock sync object */
-void ff_rel_grant (_SYNC_t);		/* Unlock sync object */
-int ff_del_syncobj (_SYNC_t);		/* Delete a sync object */
+int ff_req_grant (_SYNC_t);            /* Lock sync object */
+void ff_rel_grant (_SYNC_t);        /* Unlock sync object */
+int ff_del_syncobj (_SYNC_t);        /* Delete a sync object */
 #endif
 
 
@@ -277,57 +277,57 @@
 
 /* File access control and file status flags (FIL.flag) */
 
-#define	FA_READ				0x01
-#define	FA_OPEN_EXISTING	0x00
-#define FA__ERROR			0x80
+#define    FA_READ                0x01
+#define    FA_OPEN_EXISTING    0x00
+#define FA__ERROR            0x80
 
 #if !_FS_READONLY
-#define	FA_WRITE			0x02
-#define	FA_CREATE_NEW		0x04
-#define	FA_CREATE_ALWAYS	0x08
-#define	FA_OPEN_ALWAYS		0x10
-#define FA__WRITTEN			0x20
-#define FA__DIRTY			0x40
+#define    FA_WRITE            0x02
+#define    FA_CREATE_NEW        0x04
+#define    FA_CREATE_ALWAYS    0x08
+#define    FA_OPEN_ALWAYS        0x10
+#define FA__WRITTEN            0x20
+#define FA__DIRTY            0x40
 #endif
 
 
 /* FAT sub type (FATFS.fs_type) */
 
-#define FS_FAT12	1
-#define FS_FAT16	2
-#define FS_FAT32	3
+#define FS_FAT12    1
+#define FS_FAT16    2
+#define FS_FAT32    3
 
 
 /* File attribute bits for directory entry */
 
-#define	AM_RDO	0x01	/* Read only */
-#define	AM_HID	0x02	/* Hidden */
-#define	AM_SYS	0x04	/* System */
-#define	AM_VOL	0x08	/* Volume label */
-#define AM_LFN	0x0F	/* LFN entry */
-#define AM_DIR	0x10	/* Directory */
-#define AM_ARC	0x20	/* Archive */
-#define AM_MASK	0x3F	/* Mask of defined bits */
+#define    AM_RDO    0x01    /* Read only */
+#define    AM_HID    0x02    /* Hidden */
+#define    AM_SYS    0x04    /* System */
+#define    AM_VOL    0x08    /* Volume label */
+#define AM_LFN    0x0F    /* LFN entry */
+#define AM_DIR    0x10    /* Directory */
+#define AM_ARC    0x20    /* Archive */
+#define AM_MASK    0x3F    /* Mask of defined bits */
 
 
 /* Fast seek feature */
-#define CREATE_LINKMAP	0xFFFFFFFF
+#define CREATE_LINKMAP    0xFFFFFFFF
 
 
 
 /*--------------------------------*/
 /* Multi-byte word access macros  */
 
-#if _WORD_ACCESS == 1	/* Enable word access to the FAT structure */
-#define	LD_WORD(ptr)		(WORD)(*(WORD*)(BYTE*)(ptr))
-#define	LD_DWORD(ptr)		(DWORD)(*(DWORD*)(BYTE*)(ptr))
-#define	ST_WORD(ptr,val)	*(WORD*)(BYTE*)(ptr)=(WORD)(val)
-#define	ST_DWORD(ptr,val)	*(DWORD*)(BYTE*)(ptr)=(DWORD)(val)
-#else					/* Use byte-by-byte access to the FAT structure */
-#define	LD_WORD(ptr)		(WORD)(((WORD)*((BYTE*)(ptr)+1)<<8)|(WORD)*(BYTE*)(ptr))
-#define	LD_DWORD(ptr)		(DWORD)(((DWORD)*((BYTE*)(ptr)+3)<<24)|((DWORD)*((BYTE*)(ptr)+2)<<16)|((WORD)*((BYTE*)(ptr)+1)<<8)|*(BYTE*)(ptr))
-#define	ST_WORD(ptr,val)	*(BYTE*)(ptr)=(BYTE)(val); *((BYTE*)(ptr)+1)=(BYTE)((WORD)(val)>>8)
-#define	ST_DWORD(ptr,val)	*(BYTE*)(ptr)=(BYTE)(val); *((BYTE*)(ptr)+1)=(BYTE)((WORD)(val)>>8); *((BYTE*)(ptr)+2)=(BYTE)((DWORD)(val)>>16); *((BYTE*)(ptr)+3)=(BYTE)((DWORD)(val)>>24)
+#if _WORD_ACCESS == 1    /* Enable word access to the FAT structure */
+#define    LD_WORD(ptr)        (WORD)(*(WORD*)(BYTE*)(ptr))
+#define    LD_DWORD(ptr)        (DWORD)(*(DWORD*)(BYTE*)(ptr))
+#define    ST_WORD(ptr,val)    *(WORD*)(BYTE*)(ptr)=(WORD)(val)
+#define    ST_DWORD(ptr,val)    *(DWORD*)(BYTE*)(ptr)=(DWORD)(val)
+#else                    /* Use byte-by-byte access to the FAT structure */
+#define    LD_WORD(ptr)        (WORD)(((WORD)*((BYTE*)(ptr)+1)<<8)|(WORD)*(BYTE*)(ptr))
+#define    LD_DWORD(ptr)        (DWORD)(((DWORD)*((BYTE*)(ptr)+3)<<24)|((DWORD)*((BYTE*)(ptr)+2)<<16)|((WORD)*((BYTE*)(ptr)+1)<<8)|*(BYTE*)(ptr))
+#define    ST_WORD(ptr,val)    *(BYTE*)(ptr)=(BYTE)(val); *((BYTE*)(ptr)+1)=(BYTE)((WORD)(val)>>8)
+#define    ST_DWORD(ptr,val)    *(BYTE*)(ptr)=(BYTE)(val); *((BYTE*)(ptr)+1)=(BYTE)((WORD)(val)>>8); *((BYTE*)(ptr)+2)=(BYTE)((DWORD)(val)>>16); *((BYTE*)(ptr)+3)=(BYTE)((DWORD)(val)>>24)
 #endif
 
 #ifdef __cplusplus