[z180-stamp.git] / fatfs / src / ff.c

/*----------------------------------------------------------------------------/
/  FatFs - FAT file system module  R0.10b                (C)ChaN, 2014
/-----------------------------------------------------------------------------/
/ 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) 2014, 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 configuration option. (_FS_TINY)
/                   Added long file name feature.
/                   Added multiple code page feature.
/                   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 feature.
/ 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 character.
/ Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h.
/                   Fixed f_unlink() fails to remove a sub-directory on _FS_RPATH.
/                   Fixed name matching error on the 13 character 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 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().
/                   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.
/ Jan 15,'11 R0.08b Fast seek feature is also applied to f_read() and f_write().
/                   f_lseek() reports required table size on creating CLMP.
/                   Extended format syntax of f_printf().
/                   Ignores duplicated directory separators in given path name.
/
/ Sep 06,'11 R0.09  f_mkfs() supports multiple partition to complete the multiple partition feature.
/                   Added f_fdisk().
/ Aug 27,'12 R0.09a Changed f_open() and f_opendir() reject null object pointer to avoid crash.
/                   Changed option name _FS_SHARE to _FS_LOCK.
/                   Fixed assertion failure due to OS/2 EA on FAT12/16 volume.
/ Jan 24,'13 R0.09b Added f_setlabel() and f_getlabel().
/
/ Oct 02,'13 R0.10  Added selection of character encoding on the file. (_STRF_ENCODE)
/                   Added f_closedir().
/                   Added forced full FAT scan for f_getfree(). (_FS_NOFSINFO)
/                   Added forced mount feature with changes of f_mount().
/                   Improved behavior of volume auto detection.
/                   Improved write throughput of f_puts() and f_printf().
/                   Changed argument of f_chdrive(), f_mkfs(), disk_read() and disk_write().
/                   Fixed f_write() can be truncated when the file size is close to 4GB.
/                   Fixed f_open(), f_mkdir() and f_setlabel() can return incorrect error code.
/ Jan 15,'14 R0.10a Added arbitrary strings as drive number in the path name. (_STR_VOLUME_ID)
/                   Added a configuration option of minimum sector size. (_MIN_SS)
/                   2nd argument of f_rename() can have a drive number and it will be ignored.
/                   Fixed f_mount() with forced mount fails when drive number is >= 1.
/                   Fixed f_close() invalidates the file object without volume lock.
/                   Fixed f_closedir() returns but the volume lock is left acquired.
/                   Fixed creation of an entry with LFN fails on too many SFN collisions.
/ May 19,'14 R0.10b Fixed a hard error in the disk I/O layer can collapse the directory entry.
/                   Fixed LFN entry is not deleted on delete/rename an object with lossy converted SFN.
/---------------------------------------------------------------------------*/

#include "ff.h"                 /* Declarations of FatFs API */
#include "diskio.h"             /* Declarations of disk I/O functions */




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

   Module Private Definitions

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

#if _FATFS != 8051      /* Revision ID */
#error Wrong include file (ff.h).
#endif


/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe 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->err = (BYTE)(res); LEAVE_FF(fs, res); }


/* Definitions of sector size */
#if (_MAX_SS < _MIN_SS) || (_MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096) || (_MIN_SS != 512 && _MIN_SS != 1024 && _MIN_SS != 2048 && _MIN_SS != 4096)
#error Wrong sector size configuration.
#endif
#if _MAX_SS == _MIN_SS
#define SS(fs)  ((UINT)_MAX_SS) /* Fixed sector size */
#else
#define SS(fs)  ((fs)->ssize)   /* Variable sector size */
#endif


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



/* DBCS code ranges and SBCS extend character conversion table */

#if _CODE_PAGE == 932   /* Japanese Shift-JIS */
#define _DF1S   0x81    /* DBC 1st byte range 1 start */
#define _DF1E   0x9F    /* DBC 1st byte range 1 end */
#define _DF2S   0xE0    /* DBC 1st byte range 2 start */
#define _DF2E   0xFC    /* DBC 1st byte range 2 end */
#define _DS1S   0x40    /* DBC 2nd byte range 1 start */
#define _DS1E   0x7E    /* DBC 2nd byte range 1 end */
#define _DS2S   0x80    /* DBC 2nd byte range 2 start */
#define _DS2E   0xFC    /* DBC 2nd byte range 2 end */

#elif _CODE_PAGE == 936 /* Simplified Chinese GBK */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0x80
#define _DS2E   0xFE

#elif _CODE_PAGE == 949 /* Korean */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x41
#define _DS1E   0x5A
#define _DS2S   0x61
#define _DS2E   0x7A
#define _DS3S   0x81
#define _DS3E   0xFE

#elif _CODE_PAGE == 950 /* Traditional Chinese Big5 */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0xA1
#define _DS2E   0xFE

#elif _CODE_PAGE == 437 /* U.S. (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F,0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 720 /* Arabic (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x45,0x41,0x84,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x49,0x49,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 737 /* Greek (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
                                0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xE7,0xE8,0xF1,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 775 /* Baltic (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 850 /* Multilingual Latin 1 (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 852 /* Latin 2 (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F,0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0x9F, \
                                0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 855 /* Cyrillic (OEM) */
#define _DF1S   0
#define _EXCVT {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F,0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
                                0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
                                0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 857 /* Turkish (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x98,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
                                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0x59,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 858 /* Multilingual Latin 1 + Euro (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 862 /* Hebrew (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 866 /* Russian (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0x90,0x91,0x92,0x93,0x9d,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 874 /* Thai (OEM, Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1250 /* Central Europe (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xA3,0xB4,0xB5,0xB6,0xB7,0xB8,0xA5,0xAA,0xBB,0xBC,0xBD,0xBC,0xAF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1251 /* Cyrillic (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x82,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x80,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
                                0xA0,0xA2,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB2,0xA5,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xA3,0xBD,0xBD,0xAF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF}

#elif _CODE_PAGE == 1252 /* Latin 1 (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0xAd,0x9B,0x8C,0x9D,0xAE,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1253 /* Greek (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xA2,0xB8,0xB9,0xBA, \
                                0xE0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xFB,0xBC,0xFD,0xBF,0xFF}

#elif _CODE_PAGE == 1254 /* Turkish (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x9D,0x9E,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1255 /* Hebrew (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1256 /* Arabic (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x8C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0x41,0xE1,0x41,0xE3,0xE4,0xE5,0xE6,0x43,0x45,0x45,0x45,0x45,0xEC,0xED,0x49,0x49,0xF0,0xF1,0xF2,0xF3,0x4F,0xF5,0xF6,0xF7,0xF8,0x55,0xFA,0x55,0x55,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1257 /* Baltic (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xBC,0xBD,0xBE,0xAF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1258 /* Vietnam (OEM, Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0xAC,0x9D,0x9E,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xEC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xFE,0x9F}

#elif _CODE_PAGE == 1   /* ASCII (for only non-LFN cfg) */
#if _USE_LFN
#error Cannot use LFN feature without valid code page.
#endif
#define _DF1S   0

#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 */
#define MIN_FAT16       4086U   /* Minimum number of clusters for FAT16 */
#define MIN_FAT32       65526U  /* 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 directory 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 directory first cluster (4) */
#define BPB_FSInfo                      48              /* Offset of FSINFO sector (2) */
#define BPB_BkBootSec           50              /* Offset of backup boot sector (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             /* Signature word (2) */

#define DIR_Name                        0               /* Short file name (11) */
#define DIR_Attr                        11              /* Attribute (1) */
#define DIR_NTres                       12              /* NT flag (1) */
#define DIR_CrtTimeTenth        13              /* Created time sub-second (1) */
#define DIR_CrtTime                     14              /* Created time (2) */
#define DIR_CrtDate                     16              /* Created date (2) */
#define DIR_LstAccDate          18              /* Last accessed 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 entry mark in DIR_Name[0] */
#define NDDE                            0x05    /* Replacement of the character collides with DDE */




/*------------------------------------------------------------*/
/* Module private work area                                   */
/*------------------------------------------------------------*/
/* Note that uninitialized variables with static duration are
/  guaranteed zero/null as initial value. If not, either the
/  linker or start-up routine is out of ANSI-C standard.
*/

#if _VOLUMES >= 1 || _VOLUMES <= 10
static
FATFS *FatFs[_VOLUMES];         /* Pointer to the file system objects (logical drives) */
#else
#error Number of volumes must be 1 to 10.
#endif

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

#if _FS_RPATH && _VOLUMES >= 2
static
BYTE CurrVol;                           /* Current drive */
#endif

#if _FS_LOCK
static
FILESEM Files[_FS_LOCK];        /* Open object lock semaphores */
#endif

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

#elif _USE_LFN == 1                     /* LFN feature with static 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 feature with dynamic 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 feature with dynamic 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


#ifdef _EXCVT
static
const BYTE ExCvt[] = _EXCVT;    /* Upper conversion table for extended characters */
#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 (fs &&
                res != FR_NOT_ENABLED &&
                res != FR_INVALID_DRIVE &&
                res != FR_INVALID_OBJECT &&
                res != FR_TIMEOUT) {
                ff_rel_grant(fs->sobj);
        }
}
#endif




/*-----------------------------------------------------------------------*/
/* File lock control functions                                           */
/*-----------------------------------------------------------------------*/
#if _FS_LOCK

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

        /* Search file semaphore table */
        for (i = be = 0; i < _FS_LOCK; i++) {
                if (Files[i].fs) {      /* Existing entry */
                        if (Files[i].fs == dp->fs &&            /* Check if the object matched with an open object */
                                Files[i].clu == dp->sclust &&
                                Files[i].idx == dp->index) break;
                } else {                        /* Blank entry */
                        be = 1;
                }
        }
        if (i == _FS_LOCK)      /* The object is not opened */
                return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;       /* Is there a blank entry for new object? */

        /* The object 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 (void)     /* Check if an entry is available for a new object */
{
        UINT i;

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


static
UINT inc_lock ( /* Increment object open counter and returns its index (0:Internal error) */
        DIR* dp,        /* Directory object pointing the file to register or increment */
        int acc         /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
)
{
        UINT i;


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

        if (i == _FS_LOCK) {                            /* Not opened. Register it as new. */
                for (i = 0; i < _FS_LOCK && Files[i].fs; i++) ;
                if (i == _FS_LOCK) return 0;    /* No free entry to register (int err) */
                Files[i].fs = dp->fs;
                Files[i].clu = dp->sclust;
                Files[i].idx = dp->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 object open counter */
        UINT i                  /* Semaphore index (1..) */
)
{
        WORD n;
        FRESULT res;


        if (--i < _FS_LOCK) {   /* Shift index number origin from 0 */
                n = Files[i].ctr;
                if (n == 0x100) n = 0;          /* If write mode open, delete the entry */
                if (n) n--;                                     /* Decrement read mode open count */
                Files[i].ctr = n;
                if (!n) Files[i].fs = 0;        /* Delete the entry if open count gets zero */
                res = FR_OK;
        } else {
                res = FR_INT_ERR;                       /* Invalid index nunber */
        }
        return res;
}


static
void clear_lock (       /* Clear lock entries of the volume */
        FATFS *fs
)
{
        UINT i;

        for (i = 0; i < _FS_LOCK; i++) {
                if (Files[i].fs == fs) Files[i].fs = 0;
        }
}
#endif




/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the file system object               */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync_window (
        FATFS* fs               /* File system object */
)
{
        DWORD wsect;
        UINT nf;


        if (fs->wflag) {        /* Write back the sector if it is dirty */
                wsect = fs->winsect;    /* Current sector number */
                if (disk_write(fs->drv, fs->win, wsect, 1))
                        return FR_DISK_ERR;
                fs->wflag = 0;
                if (wsect - fs->fatbase < fs->fsize) {          /* Is it in the FAT area? */
                        for (nf = fs->n_fats; nf >= 2; nf--) {  /* Reflect the change to all FAT copies */
                                wsect += fs->fsize;
                                disk_write(fs->drv, fs->win, wsect, 1);
                        }
                }
        }
        return FR_OK;
}
#endif


static
FRESULT move_window (
        FATFS* fs,              /* File system object */
        DWORD sector    /* Sector number to make appearance in the fs->win[] */
)
{
        if (sector != fs->winsect) {    /* Changed current window */
#if !_FS_READONLY
                if (sync_window(fs) != FR_OK)
                        return FR_DISK_ERR;
#endif
                if (disk_read(fs->drv, fs->win, sector, 1))
                        return FR_DISK_ERR;
                fs->winsect = sector;
        }

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Synchronize file system and strage device                             */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync_fs (       /* FR_OK: successful, FR_DISK_ERR: failed */
        FATFS* fs               /* File system object */
)
{
        FRESULT res;


        res = sync_window(fs);
        if (res == FR_OK) {
                /* Update FSINFO sector if needed */
                if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {
                        /* Create FSINFO structure */
                        mem_set(fs->win, 0, SS(fs));
                        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);
                        /* Write it into the FSINFO sector */
                        fs->winsect = fs->volbase + 1;
                        disk_write(fs->drv, fs->win, fs->winsect, 1);
                        fs->fsi_flag = 0;
                }
                /* Make sure that no pending write process in the physical drive */
                if (disk_ioctl(fs->drv, CTRL_SYNC, 0) != RES_OK)
                        res = FR_DISK_ERR;
        }

        return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* Get sector# from cluster#                                             */
/*-----------------------------------------------------------------------*/


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->n_fatent - 2)) return 0;               /* Invalid cluster# */
        return clst * fs->csize + fs->database;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/


DWORD get_fat ( /* 0xFFFFFFFF:Disk error, 1:Internal error, Else:Cluster status */
        FATFS* fs,      /* File system object */
        DWORD clst      /* Cluster# to get the link information */
)
{
        UINT wc, bc;
        BYTE *p;


        if (clst < 2 || clst >= fs->n_fatent)   /* Check range */
                return 1;

        switch (fs->fs_type) {
        case FS_FAT12 :
                bc = (UINT)clst; bc += bc / 2;
                if (move_window(fs, fs->fatbase + (bc / SS(fs)))) break;
                wc = fs->win[bc % SS(fs)]; bc++;
                if (move_window(fs, fs->fatbase + (bc / SS(fs)))) break;
                wc |= fs->win[bc % SS(fs)] << 8;
                return clst & 1 ? wc >> 4 : (wc & 0xFFF);

        case FS_FAT16 :
                if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)))) break;
                p = &fs->win[clst * 2 % SS(fs)];
                return LD_WORD(p);

        case FS_FAT32 :
                if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)))) break;
                p = &fs->win[clst * 4 % SS(fs)];
                return LD_DWORD(p) & 0x0FFFFFFF;

        default:
                return 1;
        }

        return 0xFFFFFFFF;      /* An error occurred at the disk I/O layer */
}




/*-----------------------------------------------------------------------*/
/* FAT access - Change value of a FAT entry                              */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY

FRESULT put_fat (
        FATFS* fs,      /* File system object */
        DWORD clst,     /* Cluster# to be changed in range of 2 to fs->n_fatent - 1 */
        DWORD val       /* New value to mark the cluster */
)
{
        UINT bc;
        BYTE *p;
        FRESULT res;


        if (clst < 2 || clst >= fs->n_fatent) { /* Check range */
                res = FR_INT_ERR;

        } else {
                switch (fs->fs_type) {
                case FS_FAT12 :
                        bc = (UINT)clst; bc += bc / 2;
                        res = move_window(fs, fs->fatbase + (bc / SS(fs)));
                        if (res != FR_OK) break;
                        p = &fs->win[bc % SS(fs)];
                        *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
                        bc++;
                        fs->wflag = 1;
                        res = move_window(fs, fs->fatbase + (bc / SS(fs)));
                        if (res != FR_OK) break;
                        p = &fs->win[bc % SS(fs)];
                        *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
                        break;

                case FS_FAT16 :
                        res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
                        if (res != FR_OK) break;
                        p = &fs->win[clst * 2 % SS(fs)];
                        ST_WORD(p, (WORD)val);
                        break;

                case FS_FAT32 :
                        res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
                        if (res != FR_OK) break;
                        p = &fs->win[clst * 4 % SS(fs)];
                        val |= LD_DWORD(p) & 0xF0000000;
                        ST_DWORD(p, val);
                        break;

                default :
                        res = FR_INT_ERR;
                }
                fs->wflag = 1;
        }

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




/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT remove_chain (
        FATFS* fs,                      /* File system object */
        DWORD clst                      /* Cluster# to remove a chain from */
)
{
        FRESULT res;
        DWORD nxt;
#if _USE_ERASE
        DWORD scl = clst, ecl = clst, rt[2];
#endif

        if (clst < 2 || clst >= fs->n_fatent) { /* Check range */
                res = FR_INT_ERR;

        } else {
                res = FR_OK;
                while (clst < fs->n_fatent) {                   /* Not a last link? */
                        nxt = get_fat(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_fat(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;
                        }
#if _USE_ERASE
                        if (ecl + 1 == nxt) {   /* Is next cluster contiguous? */
                                ecl = nxt;
                        } else {                                /* End of contiguous clusters */ 
                                rt[0] = clust2sect(fs, scl);                                    /* Start sector */
                                rt[1] = clust2sect(fs, ecl) + fs->csize - 1;    /* End sector */
                                disk_ioctl(fs->drv, CTRL_ERASE_SECTOR, rt);             /* Erase the block */
                                scl = ecl = nxt;
                        }
#endif
                        clst = nxt;     /* Next cluster */
                }
        }

        return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* FAT handling - 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;
        FRESULT res;


        if (clst == 0) {                /* Create a new chain */
                scl = fs->last_clust;                   /* Get suggested start point */
                if (!scl || scl >= fs->n_fatent) scl = 1;
        }
        else {                                  /* Stretch the current chain */
                cs = get_fat(fs, clst);                 /* Check the cluster status */
                if (cs < 2) return 1;                   /* Invalid value */
                if (cs == 0xFFFFFFFF) return cs;        /* A disk error occurred */
                if (cs < fs->n_fatent) return cs;       /* It is already followed by next cluster */
                scl = clst;
        }

        ncl = scl;                              /* Start cluster */
        for (;;) {
                ncl++;                                                  /* Next cluster */
                if (ncl >= fs->n_fatent) {              /* Check wrap around */
                        ncl = 2;
                        if (ncl > scl) return 0;        /* No free cluster */
                }
                cs = get_fat(fs, ncl);                  /* Get the cluster status */
                if (cs == 0) break;                             /* Found a free cluster */
                if (cs == 0xFFFFFFFF || cs == 1)/* An error occurred */
                        return cs;
                if (ncl == scl) return 0;               /* No free cluster */
        }

        res = put_fat(fs, ncl, 0x0FFFFFFF);     /* Mark the new cluster "last link" */
        if (res == FR_OK && clst != 0) {
                res = put_fat(fs, clst, ncl);   /* Link it to the previous one if needed */
        }
        if (res == FR_OK) {
                fs->last_clust = ncl;                   /* Update FSINFO */
                if (fs->free_clust != 0xFFFFFFFF) {
                        fs->free_clust--;
                        fs->fsi_flag |= 1;
                }
        } else {
                ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;
        }

        return ncl;             /* Return new cluster number or error code */
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT handling - Convert offset into cluster with link map table        */
/*-----------------------------------------------------------------------*/

#if _USE_FASTSEEK
static
DWORD clmt_clust (      /* <2:Error, >=2:Cluster number */
        FIL* fp,                /* Pointer to the file object */
        DWORD ofs               /* File offset to be converted to cluster# */
)
{
        DWORD cl, ncl, *tbl;


        tbl = fp->cltbl + 1;    /* Top of CLMT */
        cl = ofs / SS(fp->fs) / fp->fs->csize;  /* Cluster order from top of the file */
        for (;;) {
                ncl = *tbl++;                   /* Number of cluters in the fragment */
                if (!ncl) return 0;             /* End of table? (error) */
                if (cl < ncl) break;    /* In this fragment? */
                cl -= ncl; tbl++;               /* Next fragment */
        }
        return cl + *tbl;       /* Return the cluster number */
}
#endif  /* _USE_FASTSEEK */




/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index                              */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_sdi (
        DIR* dp,                /* Pointer to directory object */
        UINT idx                /* Index of directory table */
)
{
        DWORD clst, sect;
        UINT ic;


        dp->index = (WORD)idx;  /* Current index */
        clst = dp->sclust;              /* Table start cluster (0:root) */
        if (clst == 1 || clst >= dp->fs->n_fatent)      /* Check start cluster range */
                return FR_INT_ERR;
        if (!clst && dp->fs->fs_type == FS_FAT32)       /* Replace cluster# 0 with root cluster# if in FAT32 */
                clst = dp->fs->dirbase;

        if (clst == 0) {        /* Static table (root-directory in FAT12/16) */
                if (idx >= dp->fs->n_rootdir)   /* Is index out of range? */
                        return FR_INT_ERR;
                sect = dp->fs->dirbase;
        }
        else {                          /* Dynamic table (root-directory in FAT32 or sub-directory) */
                ic = SS(dp->fs) / SZ_DIR * dp->fs->csize;       /* Entries per cluster */
                while (idx >= ic) {     /* Follow cluster chain */
                        clst = get_fat(dp->fs, clst);                           /* Get next cluster */
                        if (clst == 0xFFFFFFFF) return FR_DISK_ERR;     /* Disk error */
                        if (clst < 2 || clst >= dp->fs->n_fatent)       /* Reached to end of table or internal error */
                                return FR_INT_ERR;
                        idx -= ic;
                }
                sect = clust2sect(dp->fs, clst);
        }
        dp->clust = clst;       /* Current cluster# */
        if (!sect) return FR_INT_ERR;
        dp->sect = sect + idx / (SS(dp->fs) / SZ_DIR);                                  /* Sector# of the directory entry */
        dp->dir = dp->fs->win + (idx % (SS(dp->fs) / SZ_DIR)) * SZ_DIR; /* Ptr to the entry in the sector */

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory table index next                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_next (      /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
        DIR* dp,                /* Pointer to the directory object */
        int stretch             /* 0: Do not stretch table, 1: Stretch table if needed */
)
{
        DWORD clst;
        UINT i;


        i = dp->index + 1;
        if (!(i & 0xFFFF) || !dp->sect) /* Report EOT when index has reached 65535 */
                return FR_NO_FILE;

        if (!(i % (SS(dp->fs) / SZ_DIR))) {     /* Sector changed? */
                dp->sect++;                                     /* Next sector */

                if (!dp->clust) {               /* Static table */
                        if (i >= dp->fs->n_rootdir)     /* Report EOT if it reached end of static table */
                                return FR_NO_FILE;
                }
                else {                                  /* Dynamic table */
                        if (((i / (SS(dp->fs) / SZ_DIR)) & (dp->fs->csize - 1)) == 0) { /* Cluster changed? */
                                clst = get_fat(dp->fs, dp->clust);                              /* Get next cluster */
                                if (clst <= 1) return FR_INT_ERR;
                                if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
                                if (clst >= dp->fs->n_fatent) {                                 /* If it reached end of dynamic table, */
#if !_FS_READONLY
                                        UINT c;
                                        if (!stretch) return FR_NO_FILE;                        /* If do not stretch, report EOT */
                                        clst = create_chain(dp->fs, dp->clust);         /* Stretch 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 stretched table */
                                        if (sync_window(dp->fs)) return FR_DISK_ERR;/* Flush disk access window */
                                        mem_set(dp->fs->win, 0, SS(dp->fs));            /* Clear window buffer */
                                        dp->fs->winsect = clust2sect(dp->fs, clst);     /* Cluster start sector */
                                        for (c = 0; c < dp->fs->csize; c++) {           /* Fill the new cluster with 0 */
                                                dp->fs->wflag = 1;
                                                if (sync_window(dp->fs)) return FR_DISK_ERR;
                                                dp->fs->winsect++;
                                        }
                                        dp->fs->winsect -= c;                                           /* Rewind window offset */
#else
                                        if (!stretch) return FR_NO_FILE;                        /* If do not stretch, report EOT (this is to suppress warning) */
                                        return FR_NO_FILE;                                                      /* Report EOT */
#endif
                                }
                                dp->clust = clst;                               /* Initialize data for new cluster */
                                dp->sect = clust2sect(dp->fs, clst);
                        }
                }
        }

        dp->index = (WORD)i;    /* Current index */
        dp->dir = dp->fs->win + (i % (SS(dp->fs) / SZ_DIR)) * SZ_DIR;   /* Current entry in the window */

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Reserve directory entry                          */
/*-----------------------------------------------------------------------*/

#if !_FS_READONLY
static
FRESULT dir_alloc (
        DIR* dp,        /* Pointer to the directory object */
        UINT nent       /* Number of contiguous entries to allocate (1-21) */
)
{
        FRESULT res;
        UINT n;


        res = dir_sdi(dp, 0);
        if (res == FR_OK) {
                n = 0;
                do {
                        res = move_window(dp->fs, dp->sect);
                        if (res != FR_OK) break;
                        if (dp->dir[0] == DDE || dp->dir[0] == 0) {     /* Is it a blank entry? */
                                if (++n == nent) break; /* A block of contiguous entries is found */
                        } else {
                                n = 0;                                  /* Not a blank entry. Restart to search */
                        }
                        res = dir_next(dp, 1);          /* Next entry with table stretch enabled */
                } while (res == FR_OK);
        }
        if (res == FR_NO_FILE) res = FR_DENIED; /* No directory entry to allocate */
        return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* Directory handling - Load/Store start cluster number                  */
/*-----------------------------------------------------------------------*/

static
DWORD ld_clust (
        FATFS* fs,      /* Pointer to the fs object */
        BYTE* dir       /* Pointer to the directory entry */
)
{
        DWORD cl;

        cl = LD_WORD(dir+DIR_FstClusLO);
        if (fs->fs_type == FS_FAT32)
                cl |= (DWORD)LD_WORD(dir+DIR_FstClusHI) << 16;

        return cl;
}


#if !_FS_READONLY
static
void st_clust (
        BYTE* dir,      /* Pointer to the directory entry */
        DWORD cl        /* Value to be set */
)
{
        ST_WORD(dir+DIR_FstClusLO, cl);
        ST_WORD(dir+DIR_FstClusHI, cl >> 16);
}
#endif




/*-----------------------------------------------------------------------*/
/* LFN handling - 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 characters in the directory entry */


static
int cmp_lfn (                   /* 1:Matched, 0:Not matched */
        WCHAR* lfnbuf,          /* Pointer to the LFN to be compared */
        BYTE* dir                       /* Pointer to the directory entry containing a part of LFN */
)
{
        UINT i, s;
        WCHAR wc, uc;


        i = ((dir[LDIR_Ord] & ~LLE) - 1) * 13;  /* Get offset in the LFN buffer */
        s = 0; wc = 1;
        do {
                uc = LD_WORD(dir+LfnOfs[s]);    /* Pick an LFN character from the entry */
                if (wc) {       /* Last character has not been processed */
                        wc = ff_wtoupper(uc);           /* Convert it to upper case */
                        if (i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++]))    /* Compare it */
                                return 0;                               /* Not matched */
                } else {
                        if (uc != 0xFFFF) return 0;     /* Check filler */
                }
        } while (++s < 13);                             /* Repeat until all characters in the entry are checked */

        if ((dir[LDIR_Ord] & LLE) && wc && lfnbuf[i])   /* Last segment matched but different length */
                return 0;

        return 1;                                               /* The part of LFN matched */
}



static
int pick_lfn (                  /* 1:Succeeded, 0:Buffer overflow */
        WCHAR* lfnbuf,          /* Pointer to the Unicode-LFN buffer */
        BYTE* dir                       /* Pointer to the directory entry */
)
{
        UINT i, s;
        WCHAR wc, uc;


        i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;  /* Offset in the LFN buffer */

        s = 0; wc = 1;
        do {
                uc = LD_WORD(dir+LfnOfs[s]);            /* Pick an LFN character from the entry */
                if (wc) {       /* Last character has not been processed */
                        if (i >= _MAX_LFN) return 0;    /* Buffer overflow? */
                        lfnbuf[i++] = wc = uc;                  /* Store it */
                } else {
                        if (uc != 0xFFFF) return 0;             /* Check filler */
                }
        } while (++s < 13);                                             /* Read all character in the entry */

        if (dir[LDIR_Ord] & LLE) {                              /* Put terminator if it is the last LFN part */
                if (i >= _MAX_LFN) return 0;            /* Buffer overflow? */
                lfnbuf[i] = 0;
        }

        return 1;
}


#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 */
)
{
        UINT i, s;
        WCHAR wc;


        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;                             /* Get offset in the LFN buffer */
        s = wc = 0;
        do {
                if (wc != 0xFFFF) wc = lfnbuf[i++];     /* Get an effective character */
                ST_WORD(dir+LfnOfs[s], wc);     /* Put it */
                if (!wc) wc = 0xFFFF;           /* Padding characters following last character */
        } while (++s < 13);
        if (wc == 0xFFFF || !lfnbuf[i]) ord |= LLE;     /* 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
static
void gen_numname (
        BYTE* dst,                      /* Pointer to the buffer to store numbered SFN */
        const BYTE* src,        /* Pointer to SFN */
        const WCHAR* lfn,       /* Pointer to LFN */
        UINT seq                        /* Sequence number */
)
{
        BYTE ns[8], c;
        UINT i, j;


        mem_cpy(dst, src, 11);

        if (seq > 5) {  /* On many collisions, generate a hash number instead of sequential number */
                WCHAR wc;
                DWORD sr = seq;

                while (*lfn) {  /* Create a CRC */
                        wc = *lfn++;
                        for (i = 0; i < 16; i++) {
                                sr = (sr << 1) + (wc & 1);
                                wc >>= 1;
                                if (sr & 0x10000) sr ^= 0x11021;
                        }
                }
                seq = (UINT)sr;
        }

        /* itoa (hexdecimal) */
        i = 7;
        do {
                c = (seq % 16) + '0';
                if (c > '9') c += 7;
                ns[i--] = c;
                seq /= 16;
        } while (seq);
        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         /* Pointer to the SFN entry */
)
{
        BYTE sum = 0;
        UINT n = 11;

        do sum = (sum >> 1) + (sum << 7) + *dir++; while (--n);
        return sum;
}
#endif




/*-----------------------------------------------------------------------*/
/* Directory handling - Find an object in the directory                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_find (
        DIR* dp                 /* Pointer to the directory object linked to the file name */
)
{
        FRESULT res;
        BYTE c, *dir;
#if _USE_LFN
        BYTE a, ord, sum;
#endif

        res = dir_sdi(dp, 0);                   /* Rewind directory object */
        if (res != FR_OK) return res;

#if _USE_LFN
        ord = sum = 0xFF; dp->lfn_idx = 0xFFFF; /* Reset LFN sequence */
#endif
        do {
                res = move_window(dp->fs, dp->sect);
                if (res != FR_OK) break;
                dir = dp->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; dp->lfn_idx = 0xFFFF;       /* Reset LFN sequence */
                } else {
                        if (a == AM_LFN) {                      /* An LFN entry is found */
                                if (dp->lfn) {
                                        if (c & LLE) {          /* Is it start of LFN sequence? */
                                                sum = dir[LDIR_Chksum];
                                                c &= ~LLE; ord = c;     /* LFN start order */
                                                dp->lfn_idx = dp->index;        /* Start index of LFN */
                                        }
                                        /* Check validity of the LFN entry and compare it with given name */
                                        ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
                                }
                        } else {                                        /* An SFN entry is found */
                                if (!ord && sum == sum_sfn(dir)) break; /* LFN matched? */
                                if (!(dp->fn[NS] & NS_LOSS) && !mem_cmp(dir, dp->fn, 11)) break;        /* SFN matched? */
                                ord = 0xFF; dp->lfn_idx = 0xFFFF;       /* Reset LFN sequence */
                        }
                }
#else           /* Non LFN configuration */
                if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dp->fn, 11)) /* Is it a valid entry? */
                        break;
#endif
                res = dir_next(dp, 0);          /* Next entry */
        } while (res == FR_OK);

        return res;
}




/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2
static
FRESULT dir_read (
        DIR* dp,                /* Pointer to the directory object */
        int vol                 /* Filtered by 0:file/directory or 1:volume label */
)
{
        FRESULT res;
        BYTE a, c, *dir;
#if _USE_LFN
        BYTE ord = 0xFF, sum = 0xFF;
#endif

        res = FR_NO_FILE;
        while (dp->sect) {
                res = move_window(dp->fs, dp->sect);
                if (res != FR_OK) break;
                dir = dp->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 == DDE || (!_FS_RPATH && c == '.') || (int)(a == AM_VOL) != vol) {        /* 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;
                                        dp->lfn_idx = dp->index;
                                }
                                /* Check LFN validity and capture it */
                                ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
                        } else {                                        /* An SFN entry is found */
                                if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN? */
                                        dp->lfn_idx = 0xFFFF;           /* It has no LFN. */
                                break;
                        }
                }
#else           /* Non LFN configuration */
                if (c != DDE && (_FS_RPATH || c != '.') && a != AM_LFN && (int)(a == AM_VOL) == vol)    /* Is it a valid entry? */
                        break;
#endif
                res = dir_next(dp, 0);                          /* Next entry */
                if (res != FR_OK) break;
        }

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

        return res;
}
#endif  /* _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2 */




/*-----------------------------------------------------------------------*/
/* 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* dp                         /* Target directory with object name to be created */
)
{
        FRESULT res;
#if _USE_LFN    /* LFN configuration */
        UINT n, nent;
        BYTE sn[12], *fn, sum;
        WCHAR *lfn;


        fn = dp->fn; lfn = dp->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; dp->lfn = 0;                        /* Find only SFN */
                for (n = 1; n < 100; n++) {
                        gen_numname(fn, sn, lfn, n);    /* Generate a numbered name */
                        res = dir_find(dp);                             /* 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]; dp->lfn = lfn;
        }

        if (sn[NS] & NS_LFN) {                  /* When LFN is to be created, allocate entries for an SFN + LFNs. */
                for (n = 0; lfn[n]; n++) ;
                nent = (n + 25) / 13;
        } else {                                                /* Otherwise allocate an entry for an SFN  */
                nent = 1;
        }
        res = dir_alloc(dp, nent);              /* Allocate entries */

        if (res == FR_OK && --nent) {   /* Set LFN entry if needed */
                res = dir_sdi(dp, dp->index - nent);
                if (res == FR_OK) {
                        sum = sum_sfn(dp->fn);  /* Sum value of the SFN tied to the LFN */
                        do {                                    /* Store LFN entries in bottom first */
                                res = move_window(dp->fs, dp->sect);
                                if (res != FR_OK) break;
                                fit_lfn(dp->lfn, dp->dir, (BYTE)nent, sum);
                                dp->fs->wflag = 1;
                                res = dir_next(dp, 0);  /* Next entry */
                        } while (res == FR_OK && --nent);
                }
        }
#else   /* Non LFN configuration */
        res = dir_alloc(dp, 1);         /* Allocate an entry for SFN */
#endif

        if (res == FR_OK) {                             /* Set SFN entry */
                res = move_window(dp->fs, dp->sect);
                if (res == FR_OK) {
                        mem_set(dp->dir, 0, SZ_DIR);    /* Clean the entry */
                        mem_cpy(dp->dir, dp->fn, 11);   /* Put SFN */
#if _USE_LFN
                        dp->dir[DIR_NTres] = dp->fn[NS] & (NS_BODY | NS_EXT);   /* Put NT flag */
#endif
                        dp->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* dp                         /* Directory object pointing the entry to be removed */
)
{
        FRESULT res;
#if _USE_LFN    /* LFN configuration */
        UINT i;

        i = dp->index;  /* SFN index */
        res = dir_sdi(dp, (dp->lfn_idx == 0xFFFF) ? i : dp->lfn_idx);   /* Goto the SFN or top of the LFN entries */
        if (res == FR_OK) {
                do {
                        res = move_window(dp->fs, dp->sect);
                        if (res != FR_OK) break;
                        mem_set(dp->dir, 0, SZ_DIR);    /* Clear and mark the entry "deleted" */
                        *dp->dir = DDE;
                        dp->fs->wflag = 1;
                        if (dp->index >= i) break;      /* When reached SFN, all entries of the object has been deleted. */
                        res = dir_next(dp, 0);          /* Next entry */
                } while (res == FR_OK);
                if (res == FR_NO_FILE) res = FR_INT_ERR;
        }

#else                   /* Non LFN configuration */
        res = dir_sdi(dp, dp->index);
        if (res == FR_OK) {
                res = move_window(dp->fs, dp->sect);
                if (res == FR_OK) {
                        mem_set(dp->dir, 0, SZ_DIR);    /* Clear and mark the entry "deleted" */
                        *dp->dir = DDE;
                        dp->fs->wflag = 1;
                }
        }
#endif

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




/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2
static
void get_fileinfo (             /* No return code */
        DIR* dp,                        /* Pointer to the directory object */
        FILINFO* fno            /* Pointer to the file information to be filled */
)
{
        UINT i;
        TCHAR *p, c;


        p = fno->fname;
        if (dp->sect) {         /* Get SFN */
                BYTE *dir = dp->dir;

                i = 0;
                while (i < 11) {                /* Copy name body and extension */
                        c = (TCHAR)dir[i++];
                        if (c == ' ') continue;                 /* Skip padding spaces */
                        if (c == NDDE) c = (TCHAR)DDE;  /* Restore replaced DDE character */
                        if (i == 9) *p++ = '.';                 /* Insert a . if extension is exist */
#if _USE_LFN
                        if (IsUpper(c) && (dir[DIR_NTres] & (i >= 9 ? NS_EXT : NS_BODY)))
                                c += 0x20;                      /* To lower */
#if _LFN_UNICODE
                        if (IsDBCS1(c) && i != 8 && i != 11 && IsDBCS2(dir[i]))
                                c = c << 8 | dir[i++];
                        c = ff_convert(c, 1);   /* OEM -> Unicode */
                        if (!c) c = '?';
#endif
#endif
                        *p++ = c;
                }
                fno->fattrib = dir[DIR_Attr];                           /* Attribute */
                fno->fsize = LD_DWORD(dir+DIR_FileSize);        /* Size */
                fno->fdate = LD_WORD(dir+DIR_WrtDate);          /* Date */
                fno->ftime = LD_WORD(dir+DIR_WrtTime);          /* Time */
        }
        *p = 0;         /* Terminate SFN string by a \0 */

#if _USE_LFN
        if (fno->lfname) {
                WCHAR w, *lfn;

                i = 0; p = fno->lfname;
                if (dp->sect && fno->lfsize && dp->lfn_idx != 0xFFFF) { /* Get LFN if available */
                        lfn = dp->lfn;
                        while ((w = *lfn++) != 0) {             /* Get an LFN character */
#if !_LFN_UNICODE
                                w = ff_convert(w, 0);           /* Unicode -> OEM */
                                if (!w) { i = 0; break; }       /* No LFN if it could not be converted */
                                if (_DF1S && w >= 0x100)        /* Put 1st byte if it is a DBC (always false on SBCS cfg) */
                                        p[i++] = (TCHAR)(w >> 8);
#endif
                                if (i >= fno->lfsize - 1) { i = 0; break; }     /* No LFN if buffer overflow */
                                p[i++] = (TCHAR)w;
                        }
                }
                p[i] = 0;       /* Terminate LFN string by a \0 */
        }
#endif
}
#endif /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2*/




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

static
FRESULT create_name (
        DIR* dp,                        /* Pointer to the directory object */
        const TCHAR** path      /* Pointer to pointer to the segment in the path string */
)
{
#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 = dp->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 characters for LFN */
                        return FR_INVALID_NAME;
                lfn[di++] = w;                                  /* Store the Unicode character */
        }
        *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++)
                        dp->fn[i] = (i < di) ? '.' : ' ';
                dp->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(dp->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 character */
                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 character */
#ifdef _EXCVT
                        w = ff_convert(w, 0);           /* Unicode -> OEM code */
                        if (w) w = ExCvt[w - 0x80];     /* Convert extended character to upper (SBCS) */
#else
                        w = ff_convert(ff_wtoupper(w), 0);      /* Upper converted Unicode -> OEM code */
#endif
                        cf |= NS_LFN;                           /* Force create LFN entry */
                }

                if (_DF1S && w >= 0x100) {              /* Double byte character (always false on SBCS cfg) */
                        if (i >= ni - 1) {
                                cf |= NS_LOSS | NS_LFN; i = ni; continue;
                        }
                        dp->fn[i++] = (BYTE)(w >> 8);
                } else {                                                /* Single byte character */
                        if (!w || chk_chr("+,;=[]", w)) {       /* Replace illegal characters for SFN */
                                w = '_'; cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
                        } else {
                                if (IsUpper(w)) {               /* ASCII large capital */
                                        b |= 2;
                                } else {
                                        if (IsLower(w)) {       /* ASCII small capital */
                                                b |= 1; w -= 0x20;
                                        }
                                }
                        }
                }
                dp->fn[i++] = (BYTE)w;
        }

        if (dp->fn[0] == DDE) dp->fn[0] = NDDE; /* If the first character collides with deleted mark, replace it with 0x05 */

        if (ni == 8) b <<= 2;
        if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03)   /* Create LFN entry when there are composite capitals */
                cf |= NS_LFN;
        if (!(cf & NS_LFN)) {                                           /* When LFN is in 8.3 format without extended character, NT flags are created */
                if ((b & 0x03) == 0x01) cf |= NS_EXT;   /* NT flag (Extension has only small capital) */
                if ((b & 0x0C) == 0x04) cf |= NS_BODY;  /* NT flag (Filename has only small capital) */
        }

        dp->fn[NS] = cf;        /* SFN is created */

        return FR_OK;


#else   /* Non-LFN configuration */
        BYTE b, c, d, *sfn;
        UINT ni, si, i;
        const char *p;

        /* Create file name in directory form */
        for (p = *path; *p == '/' || *p == '\\'; p++) ; /* Strip duplicated separator */
        sfn = dp->fn;
        mem_set(sfn, ' ', 11);
        si = i = b = 0; ni = 8;
#if _FS_RPATH
        if (p[si] == '.') { /* Is this a dot entry? */
                for (;;) {
                        c = (BYTE)p[si++];
                        if (c != '.' || si >= 3) break;
                        sfn[i++] = c;
                }
                if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
                *path = &p[si];                                                                 /* Return pointer to the next segment */
                sfn[NS] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;       /* Set last segment flag if end of path */
                return FR_OK;
        }
#endif
        for (;;) {
                c = (BYTE)p[si++];
                if (c <= ' ' || c == '/' || c == '\\') break;   /* Break on end of segment */
                if (c == '.' || i >= ni) {
                        if (ni != 8 || c != '.') return FR_INVALID_NAME;
                        i = 8; ni = 11;
                        b <<= 2; continue;
                }
                if (c >= 0x80) {                                /* Extended character? */
                        b |= 3;                                         /* Eliminate NT flag */
#ifdef _EXCVT
                        c = ExCvt[c - 0x80];            /* To upper extended characters (SBCS cfg) */
#else
#if !_DF1S
                        return FR_INVALID_NAME;         /* Reject extended characters (ASCII cfg) */
#endif
#endif
                }
                if (IsDBCS1(c)) {                               /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
                        d = (BYTE)p[si++];                      /* Get 2nd byte */
                        if (!IsDBCS2(d) || i >= ni - 1) /* Reject invalid DBC */
                                return FR_INVALID_NAME;
                        sfn[i++] = c;
                        sfn[i++] = d;
                } else {                                                /* Single byte code */
                        if (chk_chr("\"*+,:;<=>\?[]|\x7F", c))  /* Reject illegal chrs for SFN */
                                return FR_INVALID_NAME;
                        if (IsUpper(c)) {                       /* ASCII large capital? */
                                b |= 2;
                        } else {
                                if (IsLower(c)) {               /* ASCII small capital? */
                                        b |= 1; c -= 0x20;
                                }
                        }
                        sfn[i++] = c;
                }
        }
        *path = &p[si];                                         /* Return pointer to the next segment */
        c = (c <= ' ') ? NS_LAST : 0;           /* Set last segment flag if end of path */

        if (!i) return FR_INVALID_NAME;         /* Reject nul string */
        if (sfn[0] == DDE) sfn[0] = NDDE;       /* When first character collides with DDE, replace it with 0x05 */

        if (ni == 8) b <<= 2;
        if ((b & 0x03) == 0x01) c |= NS_EXT;    /* NT flag (Name extension has only small capital) */
        if ((b & 0x0C) == 0x04) c |= NS_BODY;   /* NT flag (Name body has only small capital) */

        sfn[NS] = c;            /* Store NT flag, File name is created */

        return FR_OK;
#endif
}




/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static
FRESULT follow_path (   /* FR_OK(0): successful, !=0: error code */
        DIR* dp,                        /* Directory object to return last directory and found object */
        const TCHAR* path       /* Full-path string to find a file or directory */
)
{
        FRESULT res;
        BYTE *dir, ns;


#if _FS_RPATH
        if (*path == '/' || *path == '\\') {    /* There is a heading separator */
                path++; dp->sclust = 0;                         /* Strip it and start from the root directory */
        } else {                                                                /* No heading separator */
                dp->sclust = dp->fs->cdir;                      /* Start from the current directory */
        }
#else
        if (*path == '/' || *path == '\\')              /* Strip heading separator if exist */
                path++;
        dp->sclust = 0;                                                 /* Always start from the root directory */
#endif

        if ((UINT)*path < ' ') {                                /* Null path name is the origin directory itself */
                res = dir_sdi(dp, 0);
                dp->dir = 0;
        } else {                                                                /* Follow path */
                for (;;) {
                        res = create_name(dp, &path);   /* Get a segment name of the path */
                        if (res != FR_OK) break;
                        res = dir_find(dp);                             /* Find an object with the sagment name */
                        ns = dp->fn[NS];
                        if (res != FR_OK) {                             /* Failed to find the object */
                                if (res == FR_NO_FILE) {        /* Object is not found */
                                        if (_FS_RPATH && (ns & NS_DOT)) {       /* If dot entry is not exist, */
                                                dp->sclust = 0; dp->dir = 0;    /* it is the root directory and stay there */
                                                if (!(ns & NS_LAST)) continue;  /* Continue to follow if not last segment */
                                                res = FR_OK;                                    /* Ended at the root directroy. Function completed. */
                                        } else {                                                        /* Could not find the object */
                                                if (!(ns & NS_LAST)) res = FR_NO_PATH;  /* Adjust error code if not last segment */
                                        }
                                }
                                break;
                        }
                        if (ns & NS_LAST) break;                        /* Last segment matched. Function completed. */
                        dir = dp->dir;                                          /* Follow the sub-directory */
                        if (!(dir[DIR_Attr] & AM_DIR)) {        /* It is not a sub-directory and cannot follow */
                                res = FR_NO_PATH; break;
                        }
                        dp->sclust = ld_clust(dp->fs, dir);
                }
        }

        return res;
}




/*-----------------------------------------------------------------------*/
/* Get logical drive number from path name                               */
/*-----------------------------------------------------------------------*/

static
int get_ldnumber (              /* Returns logical drive number (-1:invalid drive) */
        const TCHAR** path      /* Pointer to pointer to the path name */
)
{
        const TCHAR *tp, *tt;
        UINT i;
        int vol = -1;


        if (*path) {    /* If the pointer is not a null */
                for (tt = *path; (UINT)*tt >= (_USE_LFN ? ' ' : '!') && *tt != ':'; tt++) ;     /* Find ':' in the path */
                if (*tt == ':') {       /* If a ':' is exist in the path name */
                        tp = *path;
                        i = *tp++ - '0'; 
                        if (i < 10 && tp == tt) {       /* Is there a numeric drive id? */
                                if (i < _VOLUMES) {     /* If a drive id is found, get the value and strip it */
                                        vol = (int)i;
                                        *path = ++tt;
                                }
                        } else {        /* No numeric drive number */
#if _STR_VOLUME_ID              /* Find string drive id */
                                static const char* const str[] = {_VOLUME_STRS};
                                const char *sp;
                                char c;
                                TCHAR tc;

                                i = 0; tt++;
                                do {
                                        sp = str[i]; tp = *path;
                                        do {    /* Compare a string drive id with path name */
                                                c = *sp++; tc = *tp++;
                                                if (IsLower(tc)) tc -= 0x20;
                                        } while (c && (TCHAR)c == tc);
                                } while ((c || tp != tt) && ++i < _VOLUMES);    /* Repeat for each id until pattern match */
                                if (i < _VOLUMES) {     /* If a drive id is found, get the value and strip it */
                                        vol = (int)i;
                                        *path = tt;
                                }
#endif
                        }
                        return vol;
                }
#if _FS_RPATH && _VOLUMES >= 2
                vol = CurrVol;  /* Current drive */
#else
                vol = 0;                /* Drive 0 */
#endif
        }
        return vol;
}




/*-----------------------------------------------------------------------*/
/* Load a sector and check if it is an FAT boot sector                   */
/*-----------------------------------------------------------------------*/

static
BYTE check_fs ( /* 0:FAT boor sector, 1:Valid boor sector but not FAT, 2:Not a boot sector, 3:Disk error */
        FATFS* fs,      /* File system object */
        DWORD sect      /* Sector# (lba) to check if it is an FAT boot record or not */
)
{
        fs->wflag = 0; fs->winsect = 0xFFFFFFFF;        /* Invaidate window */
        if (move_window(fs, sect) != FR_OK)                     /* Load boot record */
                return 3;

        if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55)       /* Check boot record signature (always placed at offset 510 even if the sector size is >512) */
                return 2;

        if ((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146)         /* Check "FAT" string */
                return 0;
        if ((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146)       /* Check "FAT" string */
                return 0;

        return 1;
}




/*-----------------------------------------------------------------------*/
/* Find logical drive and check if the volume is mounted                 */
/*-----------------------------------------------------------------------*/

static
FRESULT find_volume (   /* FR_OK(0): successful, !=0: any error occurred */
        FATFS** rfs,            /* Pointer to pointer to the found file system object */
        const TCHAR** path,     /* Pointer to pointer to the path name (drive number) */
        BYTE wmode                      /* !=0: Check write protection for write access */
)
{
        BYTE fmt;
        int vol;
        DSTATUS stat;
        DWORD bsect, fasize, tsect, sysect, nclst, szbfat;
        WORD nrsv;
        FATFS *fs;


        /* Get logical drive number from the path name */
        *rfs = 0;
        vol = get_ldnumber(path);
        if (vol < 0) return FR_INVALID_DRIVE;

        /* Check if the file system object is valid or not */
        fs = FatFs[vol];                                        /* Get pointer to the file system object */
        if (!fs) return FR_NOT_ENABLED;         /* Is the file system object available? */

        ENTER_FF(fs);                                           /* Lock the volume */
        *rfs = fs;                                                      /* Return pointer to the file system object */

        if (fs->fs_type) {                                      /* If the volume has been mounted */
                stat = disk_status(fs->drv);
                if (!(stat & STA_NOINIT)) {             /* and the physical drive is kept initialized */
                        if (!_FS_READONLY && wmode && (stat & STA_PROTECT))     /* Check write protection if needed */
                                return FR_WRITE_PROTECTED;
                        return FR_OK;                           /* The file system object is valid */
                }
        }

        /* The file system object is not valid. */
        /* Following code attempts to mount the volume. (analyze BPB and initialize the fs object) */

        fs->fs_type = 0;                                        /* Clear the file system object */
        fs->drv = LD2PD(vol);                           /* Bind the logical drive and a physical drive */
        stat = disk_initialize(fs->drv);        /* Initialize the physical drive */
        if (stat & STA_NOINIT)                          /* Check if the initialization succeeded */
                return FR_NOT_READY;                    /* Failed to initialize due to no medium or hard error */
        if (!_FS_READONLY && wmode && (stat & STA_PROTECT))     /* Check disk write protection if needed */
                return FR_WRITE_PROTECTED;
#if _MAX_SS != _MIN_SS                                          /* Get sector size (multiple sector size cfg only) */
        if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK
                || SS(fs) < _MIN_SS || SS(fs) > _MAX_SS) return FR_DISK_ERR;
#endif
        /* Find an FAT partition on the drive. Supports only generic partitioning, FDISK and SFD. */
        bsect = 0;
        fmt = check_fs(fs, bsect);                                      /* Load sector 0 and check if it is an FAT boot sector as SFD */
        if (fmt == 1 || (!fmt && (LD2PT(vol)))) {       /* Not an FAT boot sector or forced partition number */
                UINT i;
                DWORD br[4];

                for (i = 0; i < 4; i++) {                       /* Get partition offset */
                        BYTE *pt = fs->win+MBR_Table + i * SZ_PTE;
                        br[i] = pt[4] ? LD_DWORD(&pt[8]) : 0;
                }
                i = LD2PT(vol);                                         /* Partition number: 0:auto, 1-4:forced */
                if (i) i--;
                do {                                                            /* Find an FAT volume */
                        bsect = br[i];
                        fmt = bsect ? check_fs(fs, bsect) : 2;  /* Check the partition */
                } while (!LD2PT(vol) && fmt && ++i < 4);
        }
        if (fmt == 3) return FR_DISK_ERR;               /* An error occured in the disk I/O layer */
        if (fmt) return FR_NO_FILESYSTEM;               /* No FAT volume is found */

        /* An FAT volume is found. Following code initializes the file system object */

        if (LD_WORD(fs->win+BPB_BytsPerSec) != SS(fs))          /* (BPB_BytsPerSec must be equal to the physical sector size) */
                return FR_NO_FILESYSTEM;

        fasize = LD_WORD(fs->win+BPB_FATSz16);                          /* Number of sectors per FAT */
        if (!fasize) fasize = LD_DWORD(fs->win+BPB_FATSz32);
        fs->fsize = fasize;

        fs->n_fats = fs->win[BPB_NumFATs];                                      /* Number of FAT copies */
        if (fs->n_fats != 1 && fs->n_fats != 2)                         /* (Must be 1 or 2) */
                return FR_NO_FILESYSTEM;
        fasize *= fs->n_fats;                                                           /* Number of sectors for FAT area */

        fs->csize = fs->win[BPB_SecPerClus];                            /* Number of sectors per cluster */
        if (!fs->csize || (fs->csize & (fs->csize - 1)))        /* (Must be power of 2) */
                return FR_NO_FILESYSTEM;

        fs->n_rootdir = LD_WORD(fs->win+BPB_RootEntCnt);        /* Number of root directory entries */
        if (fs->n_rootdir % (SS(fs) / SZ_DIR))                          /* (Must be sector aligned) */
                return FR_NO_FILESYSTEM;

        tsect = LD_WORD(fs->win+BPB_TotSec16);                          /* Number of sectors on the volume */
        if (!tsect) tsect = LD_DWORD(fs->win+BPB_TotSec32);

        nrsv = LD_WORD(fs->win+BPB_RsvdSecCnt);                         /* Number of reserved sectors */
        if (!nrsv) return FR_NO_FILESYSTEM;                                     /* (Must not be 0) */

        /* Determine the FAT sub type */
        sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZ_DIR);     /* RSV+FAT+DIR */
        if (tsect < sysect) return FR_NO_FILESYSTEM;            /* (Invalid volume size) */
        nclst = (tsect - sysect) / fs->csize;                           /* Number of clusters */
        if (!nclst) return FR_NO_FILESYSTEM;                            /* (Invalid volume size) */
        fmt = FS_FAT12;
        if (nclst >= MIN_FAT16) fmt = FS_FAT16;
        if (nclst >= MIN_FAT32) fmt = FS_FAT32;

        /* Boundaries and Limits */
        fs->n_fatent = nclst + 2;                                                       /* Number of FAT entries */
        fs->volbase = bsect;                                                            /* Volume start sector */
        fs->fatbase = bsect + nrsv;                                             /* FAT start sector */
        fs->database = bsect + sysect;                                          /* Data start sector */
        if (fmt == FS_FAT32) {
                if (fs->n_rootdir) return FR_NO_FILESYSTEM;             /* (BPB_RootEntCnt must be 0) */
                fs->dirbase = LD_DWORD(fs->win+BPB_RootClus);   /* Root directory start cluster */
                szbfat = fs->n_fatent * 4;                                              /* (Needed FAT size) */
        } else {
                if (!fs->n_rootdir)     return FR_NO_FILESYSTEM;        /* (BPB_RootEntCnt must not be 0) */
                fs->dirbase = fs->fatbase + fasize;                             /* Root directory start sector */
                szbfat = (fmt == FS_FAT16) ?                                    /* (Needed FAT size) */
                        fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
        }
        if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs))       /* (BPB_FATSz must not be less than needed) */
                return FR_NO_FILESYSTEM;

#if !_FS_READONLY
        /* Initialize cluster allocation information */
        fs->last_clust = fs->free_clust = 0xFFFFFFFF;

        /* Get fsinfo if available */
        fs->fsi_flag = 0x80;
#if (_FS_NOFSINFO & 3) != 3
        if (fmt == FS_FAT32                             /* Enable FSINFO only if FAT32 and BPB_FSInfo is 1 */
                && LD_WORD(fs->win+BPB_FSInfo) == 1
                && move_window(fs, bsect + 1) == FR_OK)
        {
                fs->fsi_flag = 0;
                if (LD_WORD(fs->win+BS_55AA) == 0xAA55  /* Load FSINFO data if available */
                        && LD_DWORD(fs->win+FSI_LeadSig) == 0x41615252
                        && LD_DWORD(fs->win+FSI_StrucSig) == 0x61417272)
                {
#if (_FS_NOFSINFO & 1) == 0
                        fs->free_clust = LD_DWORD(fs->win+FSI_Free_Count);
#endif
#if (_FS_NOFSINFO & 2) == 0
                        fs->last_clust = LD_DWORD(fs->win+FSI_Nxt_Free);
#endif
                }
        }
#endif
#endif
        fs->fs_type = fmt;      /* FAT sub-type */
        fs->id = ++Fsid;        /* File system mount ID */
#if _FS_RPATH
        fs->cdir = 0;           /* Set current directory to root */
#endif
#if _FS_LOCK                    /* Clear file lock semaphores */
        clear_lock(fs);
#endif

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Check if the file/directory object is valid or not                    */
/*-----------------------------------------------------------------------*/

static
FRESULT validate (      /* FR_OK(0): The object is valid, !=0: Invalid */
        void* obj               /* Pointer to the object FIL/DIR to check validity */
)
{
        FIL *fil = (FIL*)obj;   /* Assuming offset of .fs and .id in the FIL/DIR structure is identical */


        if (!fil || !fil->fs || !fil->fs->fs_type || fil->fs->id != fil->id)
                return FR_INVALID_OBJECT;

        ENTER_FF(fil->fs);              /* Lock file system */

        if (disk_status(fil->fs->drv) & STA_NOINIT)
                return FR_NOT_READY;

        return FR_OK;
}




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

   Public Functions

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



/*-----------------------------------------------------------------------*/
/* Mount/Unmount a Logical Drive                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_mount (
        FATFS* fs,                      /* Pointer to the file system object (NULL:unmount)*/
        const TCHAR* path,      /* Logical drive number to be mounted/unmounted */
        BYTE opt                        /* 0:Do not mount (delayed mount), 1:Mount immediately */
)
{
        FATFS *cfs;
        int vol;
        FRESULT res;
        const TCHAR *rp = path;


        vol = get_ldnumber(&rp);
        if (vol < 0) return FR_INVALID_DRIVE;
        cfs = FatFs[vol];                                       /* Pointer to fs object */

        if (cfs) {
#if _FS_LOCK
                clear_lock(cfs);
#endif
#if _FS_REENTRANT                                               /* Discard sync object of the current volume */
                if (!ff_del_syncobj(cfs->sobj)) return FR_INT_ERR;
#endif
                cfs->fs_type = 0;                               /* Clear old fs object */
        }

        if (fs) {
                fs->fs_type = 0;                                /* Clear new fs object */
#if _FS_REENTRANT                                               /* Create sync object for the new volume */
                if (!ff_cre_syncobj((BYTE)vol, &fs->sobj)) return FR_INT_ERR;
#endif
        }
        FatFs[vol] = fs;                                        /* Register new fs object */

        if (!fs || opt != 1) return FR_OK;      /* Do not mount now, it will be mounted later */

        res = find_volume(&fs, &path, 0);       /* Force mounted the volume */
        LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Open or Create a File                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_open (
        FIL* fp,                        /* Pointer to the blank file object */
        const TCHAR* path,      /* Pointer to the file name */
        BYTE mode                       /* Access mode and file open mode flags */
)
{
        FRESULT res;
        DIR dj;
        BYTE *dir;
        DEF_NAMEBUF;


        if (!fp) return FR_INVALID_OBJECT;
        fp->fs = 0;                     /* Clear file object */

        /* Get logical drive number */
#if !_FS_READONLY
        mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
        res = find_volume(&dj.fs, &path, (BYTE)(mode & ~FA_READ));
#else
        mode &= FA_READ;
        res = find_volume(&dj.fs, &path, 0);
#endif
        if (res == FR_OK) {
                INIT_BUF(dj);
                res = follow_path(&dj, path);   /* Follow the file path */
                dir = dj.dir;
#if !_FS_READONLY       /* R/W configuration */
                if (res == FR_OK) {
                        if (!dir)       /* Default directory itself */
                                res = FR_INVALID_NAME;
#if _FS_LOCK
                        else
                                res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
#endif
                }
                /* Create or Open a file */
                if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
                        DWORD dw, cl;

                        if (res != FR_OK) {                                     /* No file, create new */
                                if (res == FR_NO_FILE)                  /* There is no file to open, create a new entry */
#if _FS_LOCK
                                        res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
                                        res = dir_register(&dj);
#endif
                                mode |= FA_CREATE_ALWAYS;               /* File is created */
                                dir = dj.dir;                                   /* New entry */
                        }
                        else {                                                          /* Any object is already existing */
                                if (dir[DIR_Attr] & (AM_RDO | AM_DIR)) {        /* Cannot overwrite it (R/O or DIR) */
                                        res = FR_DENIED;
                                } else {
                                        if (mode & FA_CREATE_NEW)       /* Cannot create as new file */
                                                res = FR_EXIST;
                                }
                        }
                        if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {        /* Truncate it if overwrite mode */
                                dw = get_fattime();                             /* Created time */
                                ST_DWORD(dir+DIR_CrtTime, dw);
                                dir[DIR_Attr] = 0;                              /* Reset attribute */
                                ST_DWORD(dir+DIR_FileSize, 0);  /* size = 0 */
                                cl = ld_clust(dj.fs, dir);              /* Get start cluster */
                                st_clust(dir, 0);                               /* cluster = 0 */
                                dj.fs->wflag = 1;
                                if (cl) {                                               /* Remove the cluster chain if exist */
                                        dw = dj.fs->winsect;
                                        res = remove_chain(dj.fs, cl);
                                        if (res == FR_OK) {
                                                dj.fs->last_clust = cl - 1;     /* Reuse the cluster hole */
                                                res = move_window(dj.fs, dw);
                                        }
                                }
                        }
                }
                else {  /* Open an existing file */
                        if (res == FR_OK) {                                     /* Follow succeeded */
                                if (dir[DIR_Attr] & AM_DIR) {   /* It is a directory */
                                        res = FR_NO_FILE;
                                } else {
                                        if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
                                                res = FR_DENIED;
                                }
                        }
                }
                if (res == FR_OK) {
                        if (mode & FA_CREATE_ALWAYS)            /* Set file change flag if created or overwritten */
                                mode |= FA__WRITTEN;
                        fp->dir_sect = dj.fs->winsect;          /* Pointer to the directory entry */
                        fp->dir_ptr = dir;
#if _FS_LOCK
                        fp->lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
                        if (!fp->lockid) res = FR_INT_ERR;
#endif
                }

#else                           /* R/O configuration */
                if (res == FR_OK) {                                     /* Follow succeeded */
                        dir = dj.dir;
                        if (!dir) {                                             /* Current directory itself */
                                res = FR_INVALID_NAME;
                        } else {
                                if (dir[DIR_Attr] & AM_DIR)     /* It is a directory */
                                        res = FR_NO_FILE;
                        }
                }
#endif
                FREE_BUF();

                if (res == FR_OK) {
                        fp->flag = mode;                                        /* File access mode */
                        fp->err = 0;                                            /* Clear error flag */
                        fp->sclust = ld_clust(dj.fs, dir);      /* File start cluster */
                        fp->fsize = LD_DWORD(dir+DIR_FileSize); /* File size */
                        fp->fptr = 0;                                           /* File pointer */
                        fp->dsect = 0;
#if _USE_FASTSEEK
                        fp->cltbl = 0;                                          /* Normal seek mode */
#endif
                        fp->fs = dj.fs;                                         /* Validate file object */
                        fp->id = fp->fs->id;
                }
        }

        LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read File                                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_read (
        FIL* fp,                /* Pointer to the file object */
        void* buff,             /* Pointer to data buffer */
        UINT btr,               /* Number of bytes to read */
        UINT* br                /* Pointer to number of bytes read */
)
{
        FRESULT res;
        DWORD clst, sect, remain;
        UINT rcnt, cc;
        BYTE csect, *rbuff = (BYTE*)buff;


        *br = 0;        /* Clear read byte counter */

        res = validate(fp);                                                     /* Check validity */
        if (res != FR_OK) LEAVE_FF(fp->fs, res);
        if (fp->err)                                                            /* Check error */
                LEAVE_FF(fp->fs, (FRESULT)fp->err);
        if (!(fp->flag & FA_READ))                                      /* Check access mode */
                LEAVE_FF(fp->fs, FR_DENIED);
        remain = fp->fsize - fp->fptr;
        if (btr > remain) btr = (UINT)remain;           /* Truncate btr by remaining bytes */

        for ( ;  btr;                                                           /* Repeat until all data read */
                rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
                if ((fp->fptr % SS(fp->fs)) == 0) {             /* On the sector boundary? */
                        csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
                        if (!csect) {                                           /* On the cluster boundary? */
                                if (fp->fptr == 0) {                    /* On the top of the file? */
                                        clst = fp->sclust;                      /* Follow from the origin */
                                } else {                                                /* Middle or end of the file */
#if _USE_FASTSEEK
                                        if (fp->cltbl)
                                                clst = clmt_clust(fp, fp->fptr);        /* Get cluster# from the CLMT */
                                        else
#endif
                                                clst = get_fat(fp->fs, fp->clust);      /* Follow cluster chain on the FAT */
                                }
                                if (clst < 2) ABORT(fp->fs, FR_INT_ERR);
                                if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                                fp->clust = clst;                               /* Update current cluster */
                        }
                        sect = clust2sect(fp->fs, fp->clust);   /* Get current sector */
                        if (!sect) ABORT(fp->fs, FR_INT_ERR);
                        sect += csect;
                        cc = btr / SS(fp->fs);                          /* When remaining bytes >= sector size, */
                        if (cc) {                                                       /* Read maximum contiguous sectors directly */
                                if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
                                        cc = fp->fs->csize - csect;
                                if (disk_read(fp->fs->drv, rbuff, sect, cc))
                                        ABORT(fp->fs, FR_DISK_ERR);
#if !_FS_READONLY && _FS_MINIMIZE <= 2                  /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if _FS_TINY
                                if (fp->fs->wflag && fp->fs->winsect - sect < cc)
                                        mem_cpy(rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs));
#else
                                if ((fp->flag & FA__DIRTY) && fp->dsect - sect < cc)
                                        mem_cpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs));
#endif
#endif
                                rcnt = SS(fp->fs) * cc;                 /* Number of bytes transferred */
                                continue;
                        }
#if !_FS_TINY
                        if (fp->dsect != sect) {                        /* Load data sector if not in cache */
#if !_FS_READONLY
                                if (fp->flag & FA__DIRTY) {             /* Write-back dirty sector cache */
                                        if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                                                ABORT(fp->fs, FR_DISK_ERR);
                                        fp->flag &= ~FA__DIRTY;
                                }
#endif
                                if (disk_read(fp->fs->drv, fp->buf, sect, 1))   /* Fill sector cache */
                                        ABORT(fp->fs, FR_DISK_ERR);
                        }
#endif
                        fp->dsect = sect;
                }
                rcnt = SS(fp->fs) - ((UINT)fp->fptr % SS(fp->fs));      /* Get partial sector data from sector buffer */
                if (rcnt > btr) rcnt = btr;
#if _FS_TINY
                if (move_window(fp->fs, fp->dsect))             /* Move sector window */
                        ABORT(fp->fs, FR_DISK_ERR);
                mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt);      /* Pick partial sector */
#else
                mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt);  /* Pick partial sector */
#endif
        }

        LEAVE_FF(fp->fs, FR_OK);
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_write (
        FIL* fp,                        /* Pointer to the file object */
        const void *buff,       /* Pointer to the data to be written */
        UINT btw,                       /* Number of bytes to write */
        UINT* bw                        /* Pointer to number of bytes written */
)
{
        FRESULT res;
        DWORD clst, sect;
        UINT wcnt, cc;
        const BYTE *wbuff = (const BYTE*)buff;
        BYTE csect;


        *bw = 0;        /* Clear write byte counter */

        res = validate(fp);                                             /* Check validity */
        if (res != FR_OK) LEAVE_FF(fp->fs, res);
        if (fp->err)                                                    /* Check error */
                LEAVE_FF(fp->fs, (FRESULT)fp->err);
        if (!(fp->flag & FA_WRITE))                             /* Check access mode */
                LEAVE_FF(fp->fs, FR_DENIED);
        if (fp->fptr + btw < fp->fptr) btw = 0; /* File size cannot reach 4GB */

        for ( ;  btw;                                                   /* Repeat until all data written */
                wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
                if ((fp->fptr % SS(fp->fs)) == 0) {     /* On the sector boundary? */
                        csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
                        if (!csect) {                                   /* On the cluster boundary? */
                                if (fp->fptr == 0) {            /* On the top of the file? */
                                        clst = fp->sclust;              /* Follow from the origin */
                                        if (clst == 0)                  /* When no cluster is allocated, */
                                                clst = create_chain(fp->fs, 0); /* Create a new cluster chain */
                                } else {                                        /* Middle or end of the file */
#if _USE_FASTSEEK
                                        if (fp->cltbl)
                                                clst = clmt_clust(fp, fp->fptr);        /* Get cluster# from the CLMT */
                                        else
#endif
                                                clst = create_chain(fp->fs, fp->clust); /* Follow or stretch cluster chain on the FAT */
                                }
                                if (clst == 0) break;           /* Could not allocate a new cluster (disk full) */
                                if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
                                if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                                fp->clust = clst;                       /* Update current cluster */
                                if (fp->sclust == 0) fp->sclust = clst; /* Set start cluster if the first write */
                        }
#if _FS_TINY
                        if (fp->fs->winsect == fp->dsect && sync_window(fp->fs))        /* Write-back sector cache */
                                ABORT(fp->fs, FR_DISK_ERR);
#else
                        if (fp->flag & FA__DIRTY) {             /* Write-back sector cache */
                                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                                        ABORT(fp->fs, FR_DISK_ERR);
                                fp->flag &= ~FA__DIRTY;
                        }
#endif
                        sect = clust2sect(fp->fs, fp->clust);   /* Get current sector */
                        if (!sect) ABORT(fp->fs, FR_INT_ERR);
                        sect += csect;
                        cc = btw / SS(fp->fs);                  /* When remaining bytes >= sector size, */
                        if (cc) {                                               /* Write maximum contiguous sectors directly */
                                if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
                                        cc = fp->fs->csize - csect;
                                if (disk_write(fp->fs->drv, wbuff, sect, cc))
                                        ABORT(fp->fs, FR_DISK_ERR);
#if _FS_MINIMIZE <= 2
#if _FS_TINY
                                if (fp->fs->winsect - sect < cc) {      /* Refill sector cache if it gets invalidated by the direct write */
                                        mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
                                        fp->fs->wflag = 0;
                                }
#else
                                if (fp->dsect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
                                        mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
                                        fp->flag &= ~FA__DIRTY;
                                }
#endif
#endif
                                wcnt = SS(fp->fs) * cc;         /* Number of bytes transferred */
                                continue;
                        }
#if _FS_TINY
                        if (fp->fptr >= fp->fsize) {    /* Avoid silly cache filling at growing edge */
                                if (sync_window(fp->fs)) ABORT(fp->fs, FR_DISK_ERR);
                                fp->fs->winsect = sect;
                        }
#else
                        if (fp->dsect != sect) {                /* Fill sector cache with file data */
                                if (fp->fptr < fp->fsize &&
                                        disk_read(fp->fs->drv, fp->buf, sect, 1))
                                                ABORT(fp->fs, FR_DISK_ERR);
                        }
#endif
                        fp->dsect = sect;
                }
                wcnt = SS(fp->fs) - ((UINT)fp->fptr % SS(fp->fs));/* Put partial sector into file I/O buffer */
                if (wcnt > btw) wcnt = btw;
#if _FS_TINY
                if (move_window(fp->fs, fp->dsect))     /* Move sector window */
                        ABORT(fp->fs, FR_DISK_ERR);
                mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt);      /* Fit partial sector */
                fp->fs->wflag = 1;
#else
                mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt);  /* Fit partial sector */
                fp->flag |= FA__DIRTY;
#endif
        }

        if (fp->fptr > fp->fsize) fp->fsize = fp->fptr; /* Update file size if needed */
        fp->flag |= FA__WRITTEN;                                                /* Set file change flag */

        LEAVE_FF(fp->fs, FR_OK);
}




/*-----------------------------------------------------------------------*/
/* Synchronize the File                                                  */
/*-----------------------------------------------------------------------*/

FRESULT f_sync (
        FIL* fp         /* Pointer to the file object */
)
{
        FRESULT res;
        DWORD tm;
        BYTE *dir;


        res = validate(fp);                                     /* Check validity of the object */
        if (res == FR_OK) {
                if (fp->flag & FA__WRITTEN) {   /* Has the file been written? */
                        /* Write-back dirty buffer */
#if !_FS_TINY
                        if (fp->flag & FA__DIRTY) {
                                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                                        LEAVE_FF(fp->fs, FR_DISK_ERR);
                                fp->flag &= ~FA__DIRTY;
                        }
#endif
                        /* Update the directory entry */
                        res = move_window(fp->fs, fp->dir_sect);
                        if (res == FR_OK) {
                                dir = fp->dir_ptr;
                                dir[DIR_Attr] |= AM_ARC;                                        /* Set archive bit */
                                ST_DWORD(dir+DIR_FileSize, fp->fsize);          /* Update file size */
                                st_clust(dir, fp->sclust);                                      /* Update start cluster */
                                tm = get_fattime();                                                     /* Update updated time */
                                ST_DWORD(dir+DIR_WrtTime, tm);
                                ST_WORD(dir+DIR_LstAccDate, 0);
                                fp->flag &= ~FA__WRITTEN;
                                fp->fs->wflag = 1;
                                res = sync_fs(fp->fs);
                        }
                }
        }

        LEAVE_FF(fp->fs, res);
}

#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Close File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_close (
        FIL *fp         /* Pointer to the file object to be closed */
)
{
        FRESULT res;


#if !_FS_READONLY
        res = f_sync(fp);                                       /* Flush cached data */
        if (res == FR_OK)
#endif
        {
                res = validate(fp);                             /* Lock volume */
                if (res == FR_OK) {
#if _FS_REENTRANT
                        FATFS *fs = fp->fs;
#endif
#if _FS_LOCK
                        res = dec_lock(fp->lockid);     /* Decrement file open counter */
                        if (res == FR_OK)
#endif
                                fp->fs = 0;                             /* Invalidate file object */
#if _FS_REENTRANT
                        unlock_fs(fs, FR_OK);           /* Unlock volume */
#endif
                }
        }
        return res;
}




/*-----------------------------------------------------------------------*/
/* Change Current Directory or Current Drive, Get Current Directory      */
/*-----------------------------------------------------------------------*/

#if _FS_RPATH >= 1
#if _VOLUMES >= 2
FRESULT f_chdrive (
        const TCHAR* path               /* Drive number */
)
{
        int vol;


        vol = get_ldnumber(&path);
        if (vol < 0) return FR_INVALID_DRIVE;

        CurrVol = (BYTE)vol;

        return FR_OK;
}
#endif


FRESULT f_chdir (
        const TCHAR* path       /* Pointer to the directory path */
)
{
        FRESULT res;
        DIR dj;
        DEF_NAMEBUF;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &path, 0);
        if (res == FR_OK) {
                INIT_BUF(dj);
                res = follow_path(&dj, path);           /* Follow the path */
                FREE_BUF();
                if (res == FR_OK) {                                     /* Follow completed */
                        if (!dj.dir) {
                                dj.fs->cdir = dj.sclust;        /* Start directory itself */
                        } else {
                                if (dj.dir[DIR_Attr] & AM_DIR)  /* Reached to the directory */
                                        dj.fs->cdir = ld_clust(dj.fs, dj.dir);
                                else
                                        res = FR_NO_PATH;               /* Reached but a file */
                        }
                }
                if (res == FR_NO_FILE) res = FR_NO_PATH;
        }

        LEAVE_FF(dj.fs, res);
}


#if _FS_RPATH >= 2
FRESULT f_getcwd (
        TCHAR* buff,    /* Pointer to the directory path */
        UINT len                /* Size of path */
)
{
        FRESULT res;
        DIR dj;
        UINT i, n;
        DWORD ccl;
        TCHAR *tp;
        FILINFO fno;
        DEF_NAMEBUF;


        *buff = 0;
        /* Get logical drive number */
        res = find_volume(&dj.fs, (const TCHAR**)&buff, 0);     /* Get current volume */
        if (res == FR_OK) {
                INIT_BUF(dj);
                i = len;                        /* Bottom of buffer (directory stack base) */
                dj.sclust = dj.fs->cdir;                        /* Start to follow upper directory from current directory */
                while ((ccl = dj.sclust) != 0) {        /* Repeat while current directory is a sub-directory */
                        res = dir_sdi(&dj, 1);                  /* Get parent directory */
                        if (res != FR_OK) break;
                        res = dir_read(&dj, 0);
                        if (res != FR_OK) break;
                        dj.sclust = ld_clust(dj.fs, dj.dir);    /* Goto parent directory */
                        res = dir_sdi(&dj, 0);
                        if (res != FR_OK) break;
                        do {                                                    /* Find the entry links to the child directory */
                                res = dir_read(&dj, 0);
                                if (res != FR_OK) break;
                                if (ccl == ld_clust(dj.fs, dj.dir)) break;      /* Found the entry */
                                res = dir_next(&dj, 0); 
                        } while (res == FR_OK);
                        if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
                        if (res != FR_OK) break;
#if _USE_LFN
                        fno.lfname = buff;
                        fno.lfsize = i;
#endif
                        get_fileinfo(&dj, &fno);                /* Get the directory name and push it to the buffer */
                        tp = fno.fname;
#if _USE_LFN
                        if (*buff) tp = buff;
#endif
                        for (n = 0; tp[n]; n++) ;
                        if (i < n + 3) {
                                res = FR_NOT_ENOUGH_CORE; break;
                        }
                        while (n) buff[--i] = tp[--n];
                        buff[--i] = '/';
                }
                tp = buff;
                if (res == FR_OK) {
#if _VOLUMES >= 2
                        *tp++ = '0' + CurrVol;                  /* Put drive number */
                        *tp++ = ':';
#endif
                        if (i == len) {                                 /* Root-directory */
                                *tp++ = '/';
                        } else {                                                /* Sub-directroy */
                                do              /* Add stacked path str */
                                        *tp++ = buff[i++];
                                while (i < len);
                        }
                }
                *tp = 0;
                FREE_BUF();
        }

        LEAVE_FF(dj.fs, res);
}
#endif /* _FS_RPATH >= 2 */
#endif /* _FS_RPATH >= 1 */



#if _FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File R/W Pointer                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek (
        FIL* fp,                /* Pointer to the file object */
        DWORD ofs               /* File pointer from top of file */
)
{
        FRESULT res;


        res = validate(fp);                                     /* Check validity of the object */
        if (res != FR_OK) LEAVE_FF(fp->fs, res);
        if (fp->err)                                            /* Check error */
                LEAVE_FF(fp->fs, (FRESULT)fp->err);

#if _USE_FASTSEEK
        if (fp->cltbl) {        /* Fast seek */
                DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;

                if (ofs == CREATE_LINKMAP) {    /* Create CLMT */
                        tbl = fp->cltbl;
                        tlen = *tbl++; ulen = 2;        /* Given table size and required table size */
                        cl = fp->sclust;                        /* Top of the chain */
                        if (cl) {
                                do {
                                        /* Get a fragment */
                                        tcl = cl; ncl = 0; ulen += 2;   /* Top, length and used items */
                                        do {
                                                pcl = cl; ncl++;
                                                cl = get_fat(fp->fs, cl);
                                                if (cl <= 1) ABORT(fp->fs, FR_INT_ERR);
                                                if (cl == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                                        } while (cl == pcl + 1);
                                        if (ulen <= tlen) {             /* Store the length and top of the fragment */
                                                *tbl++ = ncl; *tbl++ = tcl;
                                        }
                                } while (cl < fp->fs->n_fatent);        /* Repeat until end of chain */
                        }
                        *fp->cltbl = ulen;      /* Number of items used */
                        if (ulen <= tlen)
                                *tbl = 0;               /* Terminate table */
                        else
                                res = FR_NOT_ENOUGH_CORE;       /* Given table size is smaller than required */

                } else {                                                /* Fast seek */
                        if (ofs > fp->fsize)            /* Clip offset at the file size */
                                ofs = fp->fsize;
                        fp->fptr = ofs;                         /* Set file pointer */
                        if (ofs) {
                                fp->clust = clmt_clust(fp, ofs - 1);
                                dsc = clust2sect(fp->fs, fp->clust);
                                if (!dsc) ABORT(fp->fs, FR_INT_ERR);
                                dsc += (ofs - 1) / SS(fp->fs) & (fp->fs->csize - 1);
                                if (fp->fptr % SS(fp->fs) && dsc != fp->dsect) {        /* Refill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
                                        if (fp->flag & FA__DIRTY) {             /* Write-back dirty sector cache */
                                                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                                                        ABORT(fp->fs, FR_DISK_ERR);
                                                fp->flag &= ~FA__DIRTY;
                                        }
#endif
                                        if (disk_read(fp->fs->drv, fp->buf, dsc, 1))    /* Load current sector */
                                                ABORT(fp->fs, FR_DISK_ERR);
#endif
                                        fp->dsect = dsc;
                                }
                        }
                }
        } else
#endif

        /* Normal Seek */
        {
                DWORD clst, bcs, nsect, ifptr;

                if (ofs > fp->fsize                                     /* In read-only mode, clip offset with the file size */
#if !_FS_READONLY
                         && !(fp->flag & FA_WRITE)
#endif
                        ) ofs = fp->fsize;

                ifptr = fp->fptr;
                fp->fptr = nsect = 0;
                if (ofs) {
                        bcs = (DWORD)fp->fs->csize * SS(fp->fs);        /* Cluster size (byte) */
                        if (ifptr > 0 &&
                                (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
                                fp->fptr = (ifptr - 1) & ~(bcs - 1);    /* start from the current cluster */
                                ofs -= fp->fptr;
                                clst = fp->clust;
                        } else {                                                                        /* When seek to back cluster, */
                                clst = fp->sclust;                                              /* start from the first cluster */
#if !_FS_READONLY
                                if (clst == 0) {                                                /* If no cluster chain, create a new chain */
                                        clst = create_chain(fp->fs, 0);
                                        if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
                                        if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                                        fp->sclust = clst;
                                }
#endif
                                fp->clust = clst;
                        }
                        if (clst != 0) {
                                while (ofs > bcs) {                                             /* Cluster following loop */
#if !_FS_READONLY
                                        if (fp->flag & FA_WRITE) {                      /* Check if in write mode or not */
                                                clst = create_chain(fp->fs, clst);      /* Force stretch if in write mode */
                                                if (clst == 0) {                                /* When disk gets full, clip file size */
                                                        ofs = bcs; break;
                                                }
                                        } else
#endif
                                                clst = get_fat(fp->fs, clst);   /* Follow cluster chain if not in write mode */
                                        if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                                        if (clst <= 1 || clst >= fp->fs->n_fatent) ABORT(fp->fs, FR_INT_ERR);
                                        fp->clust = clst;
                                        fp->fptr += bcs;
                                        ofs -= bcs;
                                }
                                fp->fptr += ofs;
                                if (ofs % SS(fp->fs)) {
                                        nsect = clust2sect(fp->fs, clst);       /* Current sector */
                                        if (!nsect) ABORT(fp->fs, FR_INT_ERR);
                                        nsect += ofs / SS(fp->fs);
                                }
                        }
                }
                if (fp->fptr % SS(fp->fs) && nsect != fp->dsect) {      /* Fill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
                        if (fp->flag & FA__DIRTY) {                     /* Write-back dirty sector cache */
                                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                                        ABORT(fp->fs, FR_DISK_ERR);
                                fp->flag &= ~FA__DIRTY;
                        }
#endif
                        if (disk_read(fp->fs->drv, fp->buf, nsect, 1))  /* Fill sector cache */
                                ABORT(fp->fs, FR_DISK_ERR);
#endif
                        fp->dsect = nsect;
                }
#if !_FS_READONLY
                if (fp->fptr > fp->fsize) {                     /* Set file change flag if the file size is extended */
                        fp->fsize = fp->fptr;
                        fp->flag |= FA__WRITTEN;
                }
#endif
        }

        LEAVE_FF(fp->fs, res);
}



#if _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Create a Directory Object                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_opendir (
        DIR* dp,                        /* Pointer to directory object to create */
        const TCHAR* path       /* Pointer to the directory path */
)
{
        FRESULT res;
        FATFS* fs;
        DEF_NAMEBUF;


        if (!dp) return FR_INVALID_OBJECT;

        /* Get logical drive number */
        res = find_volume(&fs, &path, 0);
        if (res == FR_OK) {
                dp->fs = fs;
                INIT_BUF(*dp);
                res = follow_path(dp, path);                    /* Follow the path to the directory */
                FREE_BUF();
                if (res == FR_OK) {                                             /* Follow completed */
                        if (dp->dir) {                                          /* It is not the origin directory itself */
                                if (dp->dir[DIR_Attr] & AM_DIR) /* The object is a sub directory */
                                        dp->sclust = ld_clust(fs, dp->dir);
                                else                                                    /* The object is a file */
                                        res = FR_NO_PATH;
                        }
                        if (res == FR_OK) {
                                dp->id = fs->id;
                                res = dir_sdi(dp, 0);                   /* Rewind directory */
#if _FS_LOCK
                                if (res == FR_OK) {
                                        if (dp->sclust) {
                                                dp->lockid = inc_lock(dp, 0);   /* Lock the sub directory */
                                                if (!dp->lockid)
                                                        res = FR_TOO_MANY_OPEN_FILES;
                                        } else {
                                                dp->lockid = 0; /* Root directory need not to be locked */
                                        }
                                }
#endif
                        }
                }
                if (res == FR_NO_FILE) res = FR_NO_PATH;
        }
        if (res != FR_OK) dp->fs = 0;           /* Invalidate the directory object if function faild */

        LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Close Directory                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_closedir (
        DIR *dp         /* Pointer to the directory object to be closed */
)
{
        FRESULT res;


        res = validate(dp);
        if (res == FR_OK) {
#if _FS_REENTRANT
                FATFS *fs = dp->fs;
#endif
#if _FS_LOCK
                if (dp->lockid)                         /* Decrement sub-directory open counter */
                        res = dec_lock(dp->lockid);
                if (res == FR_OK)
#endif
                        dp->fs = 0;                             /* Invalidate directory object */
#if _FS_REENTRANT
                unlock_fs(fs, FR_OK);           /* Unlock volume */
#endif
        }
        return res;
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entries in Sequence                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_readdir (
        DIR* dp,                        /* Pointer to the open directory object */
        FILINFO* fno            /* Pointer to file information to return */
)
{
        FRESULT res;
        DEF_NAMEBUF;


        res = validate(dp);                                             /* Check validity of the object */
        if (res == FR_OK) {
                if (!fno) {
                        res = dir_sdi(dp, 0);                   /* Rewind the directory object */
                } else {
                        INIT_BUF(*dp);
                        res = dir_read(dp, 0);                  /* Read an item */
                        if (res == FR_NO_FILE) {                /* Reached end of directory */
                                dp->sect = 0;
                                res = FR_OK;
                        }
                        if (res == FR_OK) {                             /* A valid entry is found */
                                get_fileinfo(dp, fno);          /* Get the object information */
                                res = dir_next(dp, 0);          /* Increment index for next */
                                if (res == FR_NO_FILE) {
                                        dp->sect = 0;
                                        res = FR_OK;
                                }
                        }
                        FREE_BUF();
                }
        }

        LEAVE_FF(dp->fs, res);
}



#if _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat (
        const TCHAR* path,      /* Pointer to the file path */
        FILINFO* fno            /* Pointer to file information to return */
)
{
        FRESULT res;
        DIR dj;
        DEF_NAMEBUF;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &path, 0);
        if (res == FR_OK) {
                INIT_BUF(dj);
                res = follow_path(&dj, path);   /* Follow the file path */
                if (res == FR_OK) {                             /* Follow completed */
                        if (dj.dir) {           /* Found an object */
                                if (fno) get_fileinfo(&dj, fno);
                        } else {                        /* It is root directory */
                                res = FR_INVALID_NAME;
                        }
                }
                FREE_BUF();
        }

        LEAVE_FF(dj.fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_getfree (
        const TCHAR* path,      /* Path name of the logical drive number */
        DWORD* nclst,           /* Pointer to a variable to return number of free clusters */
        FATFS** fatfs           /* Pointer to return pointer to corresponding file system object */
)
{
        FRESULT res;
        FATFS *fs;
        DWORD n, clst, sect, stat;
        UINT i;
        BYTE fat, *p;


        /* Get logical drive number */
        res = find_volume(fatfs, &path, 0);
        fs = *fatfs;
        if (res == FR_OK) {
                /* If free_clust is valid, return it without full cluster scan */
                if (fs->free_clust <= fs->n_fatent - 2) {
                        *nclst = fs->free_clust;
                } else {
                        /* Get number of free clusters */
                        fat = fs->fs_type;
                        n = 0;
                        if (fat == FS_FAT12) {
                                clst = 2;
                                do {
                                        stat = get_fat(fs, clst);
                                        if (stat == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
                                        if (stat == 1) { res = FR_INT_ERR; break; }
                                        if (stat == 0) n++;
                                } while (++clst < fs->n_fatent);
                        } else {
                                clst = fs->n_fatent;
                                sect = fs->fatbase;
                                i = 0; p = 0;
                                do {
                                        if (!i) {
                                                res = move_window(fs, sect++);
                                                if (res != FR_OK) break;
                                                p = fs->win;
                                                i = SS(fs);
                                        }
                                        if (fat == FS_FAT16) {
                                                if (LD_WORD(p) == 0) n++;
                                                p += 2; i -= 2;
                                        } else {
                                                if ((LD_DWORD(p) & 0x0FFFFFFF) == 0) n++;
                                                p += 4; i -= 4;
                                        }
                                } while (--clst);
                        }
                        fs->free_clust = n;
                        fs->fsi_flag |= 1;
                        *nclst = n;
                }
        }
        LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Truncate File                                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_truncate (
        FIL* fp         /* Pointer to the file object */
)
{
        FRESULT res;
        DWORD ncl;


        res = validate(fp);                                             /* Check validity of the object */
        if (res == FR_OK) {
                if (fp->err) {                                          /* Check error */
                        res = (FRESULT)fp->err;
                } else {
                        if (!(fp->flag & FA_WRITE))             /* Check access mode */
                                res = FR_DENIED;
                }
        }
        if (res == FR_OK) {
                if (fp->fsize > fp->fptr) {
                        fp->fsize = fp->fptr;   /* Set file size to current R/W point */
                        fp->flag |= FA__WRITTEN;
                        if (fp->fptr == 0) {    /* When set file size to zero, remove entire cluster chain */
                                res = remove_chain(fp->fs, fp->sclust);
                                fp->sclust = 0;
                        } else {                                /* When truncate a part of the file, remove remaining clusters */
                                ncl = get_fat(fp->fs, fp->clust);
                                res = FR_OK;
                                if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
                                if (ncl == 1) res = FR_INT_ERR;
                                if (res == FR_OK && ncl < fp->fs->n_fatent) {
                                        res = put_fat(fp->fs, fp->clust, 0x0FFFFFFF);
                                        if (res == FR_OK) res = remove_chain(fp->fs, ncl);
                                }
                        }
#if !_FS_TINY
                        if (res == FR_OK && (fp->flag & FA__DIRTY)) {
                                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                                        res = FR_DISK_ERR;
                                else
                                        fp->flag &= ~FA__DIRTY;
                        }
#endif
                }
                if (res != FR_OK) fp->err = (FRESULT)res;
        }

        LEAVE_FF(fp->fs, res);
}




/*-----------------------------------------------------------------------*/
/* Delete a File or Directory                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_unlink (
        const TCHAR* path               /* Pointer to the file or directory path */
)
{
        FRESULT res;
        DIR dj, sdj;
        BYTE *dir;
        DWORD dclst;
        DEF_NAMEBUF;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &path, 1);
        if (res == FR_OK) {
                INIT_BUF(dj);
                res = follow_path(&dj, path);           /* Follow the file path */
                if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
                        res = FR_INVALID_NAME;                  /* Cannot remove dot entry */
#if _FS_LOCK
                if (res == FR_OK) res = chk_lock(&dj, 2);       /* Cannot remove open file */
#endif
                if (res == FR_OK) {                                     /* The object is accessible */
                        dir = dj.dir;
                        if (!dir) {
                                res = FR_INVALID_NAME;          /* Cannot remove the start directory */
                        } else {
                                if (dir[DIR_Attr] & AM_RDO)
                                        res = FR_DENIED;                /* Cannot remove R/O object */
                        }
                        dclst = ld_clust(dj.fs, dir);
                        if (res == FR_OK && (dir[DIR_Attr] & AM_DIR)) { /* Is it a sub-dir? */
                                if (dclst < 2) {
                                        res = FR_INT_ERR;
                                } else {
                                        mem_cpy(&sdj, &dj, sizeof (DIR));       /* Check if the sub-directory is empty or not */
                                        sdj.sclust = dclst;
                                        res = dir_sdi(&sdj, 2);         /* Exclude dot entries */
                                        if (res == FR_OK) {
                                                res = dir_read(&sdj, 0);        /* Read an item */
                                                if (res == FR_OK                /* Not empty directory */
#if _FS_RPATH
                                                || dclst == dj.fs->cdir /* Current directory */
#endif
                                                ) res = FR_DENIED;
                                                if (res == FR_NO_FILE) res = FR_OK;     /* Empty */
                                        }
                                }
                        }
                        if (res == FR_OK) {
                                res = dir_remove(&dj);          /* Remove the directory entry */
                                if (res == FR_OK) {
                                        if (dclst)                              /* Remove the cluster chain if exist */
                                                res = remove_chain(dj.fs, dclst);
                                        if (res == FR_OK) res = sync_fs(dj.fs);
                                }
                        }
                }
                FREE_BUF();
        }

        LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Create a Directory                                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_mkdir (
        const TCHAR* path               /* Pointer to the directory path */
)
{
        FRESULT res;
        DIR dj;
        BYTE *dir, n;
        DWORD dsc, dcl, pcl, tm = get_fattime();
        DEF_NAMEBUF;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &path, 1);
        if (res == FR_OK) {
                INIT_BUF(dj);
                res = follow_path(&dj, path);                   /* Follow the file path */
                if (res == FR_OK) res = FR_EXIST;               /* Any object with same name is already existing */
                if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NS] & NS_DOT))
                        res = FR_INVALID_NAME;
                if (res == FR_NO_FILE) {                                /* Can create a new directory */
                        dcl = create_chain(dj.fs, 0);           /* Allocate a cluster for the new directory table */
                        res = FR_OK;
                        if (dcl == 0) res = FR_DENIED;          /* No space to allocate a new cluster */
                        if (dcl == 1) res = FR_INT_ERR;
                        if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;
                        if (res == FR_OK)                                       /* Flush FAT */
                                res = sync_window(dj.fs);
                        if (res == FR_OK) {                                     /* Initialize the new directory table */
                                dsc = clust2sect(dj.fs, dcl);
                                dir = dj.fs->win;
                                mem_set(dir, 0, SS(dj.fs));
                                mem_set(dir+DIR_Name, ' ', 11); /* Create "." entry */
                                dir[DIR_Name] = '.';
                                dir[DIR_Attr] = AM_DIR;
                                ST_DWORD(dir+DIR_WrtTime, tm);
                                st_clust(dir, dcl);
                                mem_cpy(dir+SZ_DIR, dir, SZ_DIR);       /* Create ".." entry */
                                dir[SZ_DIR+1] = '.'; pcl = dj.sclust;
                                if (dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase)
                                        pcl = 0;
                                st_clust(dir+SZ_DIR, pcl);
                                for (n = dj.fs->csize; n; n--) {        /* Write dot entries and clear following sectors */
                                        dj.fs->winsect = dsc++;
                                        dj.fs->wflag = 1;
                                        res = sync_window(dj.fs);
                                        if (res != FR_OK) break;
                                        mem_set(dir, 0, SS(dj.fs));
                                }
                        }
                        if (res == FR_OK) res = dir_register(&dj);      /* Register the object to the directoy */
                        if (res != FR_OK) {
                                remove_chain(dj.fs, dcl);                       /* Could not register, remove cluster chain */
                        } else {
                                dir = dj.dir;
                                dir[DIR_Attr] = AM_DIR;                         /* Attribute */
                                ST_DWORD(dir+DIR_WrtTime, tm);          /* Created time */
                                st_clust(dir, dcl);                                     /* Table start cluster */
                                dj.fs->wflag = 1;
                                res = sync_fs(dj.fs);
                        }
                }
                FREE_BUF();
        }

        LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Attribute                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_chmod (
        const TCHAR* path,      /* Pointer to the file path */
        BYTE value,                     /* Attribute bits */
        BYTE mask                       /* Attribute mask to change */
)
{
        FRESULT res;
        DIR dj;
        BYTE *dir;
        DEF_NAMEBUF;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &path, 1);
        if (res == FR_OK) {
                INIT_BUF(dj);
                res = follow_path(&dj, path);           /* Follow the file path */
                FREE_BUF();
                if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
                        res = FR_INVALID_NAME;
                if (res == FR_OK) {
                        dir = dj.dir;
                        if (!dir) {                                             /* Is it a root directory? */
                                res = FR_INVALID_NAME;
                        } else {                                                /* File or sub directory */
                                mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;    /* Valid attribute mask */
                                dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask); /* Apply attribute change */
                                dj.fs->wflag = 1;
                                res = sync_fs(dj.fs);
                        }
                }
        }

        LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Timestamp                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_utime (
        const TCHAR* path,      /* Pointer to the file/directory name */
        const FILINFO* fno      /* Pointer to the time stamp to be set */
)
{
        FRESULT res;
        DIR dj;
        BYTE *dir;
        DEF_NAMEBUF;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &path, 1);
        if (res == FR_OK) {
                INIT_BUF(dj);
                res = follow_path(&dj, path);   /* Follow the file path */
                FREE_BUF();
                if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
                        res = FR_INVALID_NAME;
                if (res == FR_OK) {
                        dir = dj.dir;
                        if (!dir) {                                     /* Root directory */
                                res = FR_INVALID_NAME;
                        } else {                                        /* File or sub-directory */
                                ST_WORD(dir+DIR_WrtTime, fno->ftime);
                                ST_WORD(dir+DIR_WrtDate, fno->fdate);
                                dj.fs->wflag = 1;
                                res = sync_fs(dj.fs);
                        }
                }
        }

        LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Rename File/Directory                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_rename (
        const TCHAR* path_old,  /* Pointer to the object to be renamed */
        const TCHAR* path_new   /* Pointer to the new name */
)
{
        FRESULT res;
        DIR djo, djn;
        BYTE buf[21], *dir;
        DWORD dw;
        DEF_NAMEBUF;


        /* Get logical drive number of the source object */
        res = find_volume(&djo.fs, &path_old, 1);
        if (res == FR_OK) {
                djn.fs = djo.fs;
                INIT_BUF(djo);
                res = follow_path(&djo, path_old);              /* Check old object */
                if (_FS_RPATH && res == FR_OK && (djo.fn[NS] & NS_DOT))
                        res = FR_INVALID_NAME;
#if _FS_LOCK
                if (res == FR_OK) res = chk_lock(&djo, 2);
#endif
                if (res == FR_OK) {                                             /* Old object is found */
                        if (!djo.dir) {                                         /* Is root dir? */
                                res = FR_NO_FILE;
                        } else {
                                mem_cpy(buf, djo.dir+DIR_Attr, 21);             /* Save the object information except name */
                                mem_cpy(&djn, &djo, sizeof (DIR));              /* Duplicate the directory object */
                                if (get_ldnumber(&path_new) >= 0)               /* Snip drive number off and ignore it */
                                        res = follow_path(&djn, path_new);      /* and check if new object is exist */
                                else
                                        res = FR_INVALID_DRIVE;
                                if (res == FR_OK) res = FR_EXIST;               /* The new object name is already existing */
                                if (res == FR_NO_FILE) {                                /* Is it a valid path and no name collision? */
/* Start critical section that any interruption can cause a cross-link */
                                        res = dir_register(&djn);                       /* Register the new entry */
                                        if (res == FR_OK) {
                                                dir = djn.dir;                                  /* Copy object information except name */
                                                mem_cpy(dir+13, buf+2, 19);
                                                dir[DIR_Attr] = buf[0] | AM_ARC;
                                                djo.fs->wflag = 1;
                                                if (djo.sclust != djn.sclust && (dir[DIR_Attr] & AM_DIR)) {             /* Update .. entry in the directory if needed */
                                                        dw = clust2sect(djo.fs, ld_clust(djo.fs, dir));
                                                        if (!dw) {
                                                                res = FR_INT_ERR;
                                                        } else {
                                                                res = move_window(djo.fs, dw);
                                                                dir = djo.fs->win+SZ_DIR;       /* .. entry */
                                                                if (res == FR_OK && dir[1] == '.') {
                                                                        dw = (djo.fs->fs_type == FS_FAT32 && djn.sclust == djo.fs->dirbase) ? 0 : djn.sclust;
                                                                        st_clust(dir, dw);
                                                                        djo.fs->wflag = 1;
                                                                }
                                                        }
                                                }
                                                if (res == FR_OK) {
                                                        res = dir_remove(&djo);         /* Remove old entry */
                                                        if (res == FR_OK)
                                                                res = sync_fs(djo.fs);
                                                }
                                        }
/* End critical section */
                                }
                        }
                }
                FREE_BUF();
        }

        LEAVE_FF(djo.fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _FS_MINIMIZE == 0 */
#endif /* _FS_MINIMIZE <= 1 */
#endif /* _FS_MINIMIZE <= 2 */



#if _USE_LABEL
/*-----------------------------------------------------------------------*/
/* Get volume label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_getlabel (
        const TCHAR* path,      /* Path name of the logical drive number */
        TCHAR* label,           /* Pointer to a buffer to return the volume label */
        DWORD* vsn                      /* Pointer to a variable to return the volume serial number */
)
{
        FRESULT res;
        DIR dj;
        UINT i, j;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &path, 0);

        /* Get volume label */
        if (res == FR_OK && label) {
                dj.sclust = 0;                                  /* Open root directory */
                res = dir_sdi(&dj, 0);
                if (res == FR_OK) {
                        res = dir_read(&dj, 1);         /* Get an entry with AM_VOL */
                        if (res == FR_OK) {                     /* A volume label is exist */
#if _USE_LFN && _LFN_UNICODE
                                WCHAR w;
                                i = j = 0;
                                do {
                                        w = (i < 11) ? dj.dir[i++] : ' ';
                                        if (IsDBCS1(w) && i < 11 && IsDBCS2(dj.dir[i]))
                                                w = w << 8 | dj.dir[i++];
                                        label[j++] = ff_convert(w, 1);  /* OEM -> Unicode */
                                } while (j < 11);
#else
                                mem_cpy(label, dj.dir, 11);
#endif
                                j = 11;
                                do {
                                        label[j] = 0;
                                        if (!j) break;
                                } while (label[--j] == ' ');
                        }
                        if (res == FR_NO_FILE) {        /* No label, return nul string */
                                label[0] = 0;
                                res = FR_OK;
                        }
                }
        }

        /* Get volume serial number */
        if (res == FR_OK && vsn) {
                res = move_window(dj.fs, dj.fs->volbase);
                if (res == FR_OK) {
                        i = dj.fs->fs_type == FS_FAT32 ? BS_VolID32 : BS_VolID;
                        *vsn = LD_DWORD(&dj.fs->win[i]);
                }
        }

        LEAVE_FF(dj.fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Set volume label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_setlabel (
        const TCHAR* label      /* Pointer to the volume label to set */
)
{
        FRESULT res;
        DIR dj;
        BYTE vn[11];
        UINT i, j, sl;
        WCHAR w;
        DWORD tm;


        /* Get logical drive number */
        res = find_volume(&dj.fs, &label, 1);
        if (res) LEAVE_FF(dj.fs, res);

        /* Create a volume label in directory form */
        vn[0] = 0;
        for (sl = 0; label[sl]; sl++) ;                         /* Get name length */
        for ( ; sl && label[sl-1] == ' '; sl--) ;       /* Remove trailing spaces */
        if (sl) {       /* Create volume label in directory form */
                i = j = 0;
                do {
#if _USE_LFN && _LFN_UNICODE
                        w = ff_convert(ff_wtoupper(label[i++]), 0);
#else
                        w = (BYTE)label[i++];
                        if (IsDBCS1(w))
                                w = (j < 10 && i < sl && IsDBCS2(label[i])) ? w << 8 | (BYTE)label[i++] : 0;
#if _USE_LFN
                        w = ff_convert(ff_wtoupper(ff_convert(w, 1)), 0);
#else
                        if (IsLower(w)) w -= 0x20;                      /* To upper ASCII characters */
#ifdef _EXCVT
                        if (w >= 0x80) w = ExCvt[w - 0x80];     /* To upper extended characters (SBCS cfg) */
#else
                        if (!_DF1S && w >= 0x80) w = 0;         /* Reject extended characters (ASCII cfg) */
#endif
#endif
#endif
                        if (!w || chk_chr("\"*+,.:;<=>\?[]|\x7F", w) || j >= (UINT)((w >= 0x100) ? 10 : 11)) /* Reject invalid characters for volume label */
                                LEAVE_FF(dj.fs, FR_INVALID_NAME);
                        if (w >= 0x100) vn[j++] = (BYTE)(w >> 8);
                        vn[j++] = (BYTE)w;
                } while (i < sl);
                while (j < 11) vn[j++] = ' ';
        }

        /* Set volume label */
        dj.sclust = 0;                                  /* Open root directory */
        res = dir_sdi(&dj, 0);
        if (res == FR_OK) {
                res = dir_read(&dj, 1);         /* Get an entry with AM_VOL */
                if (res == FR_OK) {                     /* A volume label is found */
                        if (vn[0]) {
                                mem_cpy(dj.dir, vn, 11);        /* Change the volume label name */
                                tm = get_fattime();
                                ST_DWORD(dj.dir+DIR_WrtTime, tm);
                        } else {
                                dj.dir[0] = DDE;                        /* Remove the volume label */
                        }
                        dj.fs->wflag = 1;
                        res = sync_fs(dj.fs);
                } else {                                        /* No volume label is found or error */
                        if (res == FR_NO_FILE) {
                                res = FR_OK;
                                if (vn[0]) {                            /* Create volume label as new */
                                        res = dir_alloc(&dj, 1);        /* Allocate an entry for volume label */
                                        if (res == FR_OK) {
                                                mem_set(dj.dir, 0, SZ_DIR);     /* Set volume label */
                                                mem_cpy(dj.dir, vn, 11);
                                                dj.dir[DIR_Attr] = AM_VOL;
                                                tm = get_fattime();
                                                ST_DWORD(dj.dir+DIR_WrtTime, tm);
                                                dj.fs->wflag = 1;
                                                res = sync_fs(dj.fs);
                                        }
                                }
                        }
                }
        }

        LEAVE_FF(dj.fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _USE_LABEL */



/*-----------------------------------------------------------------------*/
/* Forward data to the stream directly (available on only tiny cfg)      */
/*-----------------------------------------------------------------------*/
#if _USE_FORWARD && _FS_TINY

FRESULT f_forward (
        FIL* fp,                                                /* Pointer to the file object */
        UINT (*func)(const BYTE*,UINT), /* Pointer to the streaming function */
        UINT btf,                                               /* Number of bytes to forward */
        UINT* bf                                                /* Pointer to number of bytes forwarded */
)
{
        FRESULT res;
        DWORD remain, clst, sect;
        UINT rcnt;
        BYTE csect;


        *bf = 0;        /* Clear transfer byte counter */

        res = validate(fp);                                                             /* Check validity of the object */
        if (res != FR_OK) LEAVE_FF(fp->fs, res);
        if (fp->err)                                                                    /* Check error */
                LEAVE_FF(fp->fs, (FRESULT)fp->err);
        if (!(fp->flag & FA_READ))                                              /* Check access mode */
                LEAVE_FF(fp->fs, FR_DENIED);

        remain = fp->fsize - fp->fptr;
        if (btf > remain) btf = (UINT)remain;                   /* Truncate btf by remaining bytes */

        for ( ;  btf && (*func)(0, 0);                                  /* Repeat until all data transferred or stream becomes busy */
                fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {
                csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
                if ((fp->fptr % SS(fp->fs)) == 0) {                     /* On the sector boundary? */
                        if (!csect) {                                                   /* On the cluster boundary? */
                                clst = (fp->fptr == 0) ?                        /* On the top of the file? */
                                        fp->sclust : get_fat(fp->fs, fp->clust);
                                if (clst <= 1) ABORT(fp->fs, FR_INT_ERR);
                                if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                                fp->clust = clst;                                       /* Update current cluster */
                        }
                }
                sect = clust2sect(fp->fs, fp->clust);           /* Get current data sector */
                if (!sect) ABORT(fp->fs, FR_INT_ERR);
                sect += csect;
                if (move_window(fp->fs, sect))                          /* Move sector window */
                        ABORT(fp->fs, FR_DISK_ERR);
                fp->dsect = sect;
                rcnt = SS(fp->fs) - (WORD)(fp->fptr % SS(fp->fs));      /* Forward data from sector window */
                if (rcnt > btf) rcnt = btf;
                rcnt = (*func)(&fp->fs->win[(WORD)fp->fptr % SS(fp->fs)], rcnt);
                if (!rcnt) ABORT(fp->fs, FR_INT_ERR);
        }

        LEAVE_FF(fp->fs, FR_OK);
}
#endif /* _USE_FORWARD */



#if _USE_MKFS && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Create File System on the Drive                                       */
/*-----------------------------------------------------------------------*/
#define N_ROOTDIR       512             /* Number of root directory entries for FAT12/16 */
#define N_FATS          1               /* Number of FAT copies (1 or 2) */


FRESULT f_mkfs (
        const TCHAR* path,      /* Logical drive number */
        BYTE sfd,                       /* Partitioning rule 0:FDISK, 1:SFD */
        UINT au                         /* Allocation unit [bytes] */
)
{
        static const WORD vst[] = { 1024,   512,  256,  128,   64,    32,   16,    8,    4,    2,   0};
        static const WORD cst[] = {32768, 16384, 8192, 4096, 2048, 16384, 8192, 4096, 2048, 1024, 512};
        int vol;
        BYTE fmt, md, sys, *tbl, pdrv, part;
        DWORD n_clst, vs, n, wsect;
        UINT i;
        DWORD b_vol, b_fat, b_dir, b_data;      /* LBA */
        DWORD n_vol, n_rsv, n_fat, n_dir;       /* Size */
        FATFS *fs;
        DSTATUS stat;


        /* Check mounted drive and clear work area */
        vol = get_ldnumber(&path);
        if (vol < 0) return FR_INVALID_DRIVE;
        if (sfd > 1) return FR_INVALID_PARAMETER;
        if (au & (au - 1)) return FR_INVALID_PARAMETER;
        fs = FatFs[vol];
        if (!fs) return FR_NOT_ENABLED;
        fs->fs_type = 0;
        pdrv = LD2PD(vol);      /* Physical drive */
        part = LD2PT(vol);      /* Partition (0:auto detect, 1-4:get from partition table)*/

        /* Get disk statics */
        stat = disk_initialize(pdrv);
        if (stat & STA_NOINIT) return FR_NOT_READY;
        if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
#if _MAX_SS != _MIN_SS          /* Get disk sector size */
        if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS || SS(fs) < _MIN_SS)
                return FR_DISK_ERR;
#endif
        if (_MULTI_PARTITION && part) {
                /* Get partition information from partition table in the MBR */
                if (disk_read(pdrv, fs->win, 0, 1)) return FR_DISK_ERR;
                if (LD_WORD(fs->win+BS_55AA) != 0xAA55) return FR_MKFS_ABORTED;
                tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];
                if (!tbl[4]) return FR_MKFS_ABORTED;    /* No partition? */
                b_vol = LD_DWORD(tbl+8);        /* Volume start sector */
                n_vol = LD_DWORD(tbl+12);       /* Volume size */
        } else {
                /* Create a partition in this function */
                if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &n_vol) != RES_OK || n_vol < 128)
                        return FR_DISK_ERR;
                b_vol = (sfd) ? 0 : 63;         /* Volume start sector */
                n_vol -= b_vol;                         /* Volume size */
        }

        if (!au) {                              /* AU auto selection */
                vs = n_vol / (2000 / (SS(fs) / 512));
                for (i = 0; vs < vst[i]; i++) ;
                au = cst[i];
        }
        au /= SS(fs);           /* Number of sectors per cluster */
        if (au == 0) au = 1;
        if (au > 128) au = 128;

        /* Pre-compute number of clusters and FAT sub-type */
        n_clst = n_vol / au;
        fmt = FS_FAT12;
        if (n_clst >= MIN_FAT16) fmt = FS_FAT16;
        if (n_clst >= MIN_FAT32) fmt = FS_FAT32;

        /* Determine offset and size of FAT structure */
        if (fmt == FS_FAT32) {
                n_fat = ((n_clst * 4) + 8 + SS(fs) - 1) / SS(fs);
                n_rsv = 32;
                n_dir = 0;
        } else {
                n_fat = (fmt == FS_FAT12) ? (n_clst * 3 + 1) / 2 + 3 : (n_clst * 2) + 4;
                n_fat = (n_fat + SS(fs) - 1) / SS(fs);
                n_rsv = 1;
                n_dir = (DWORD)N_ROOTDIR * SZ_DIR / SS(fs);
        }
        b_fat = b_vol + n_rsv;                          /* FAT area start sector */
        b_dir = b_fat + n_fat * N_FATS;         /* Directory area start sector */
        b_data = b_dir + n_dir;                         /* Data area start sector */
        if (n_vol < b_data + au - b_vol) return FR_MKFS_ABORTED;        /* Too small volume */

        /* Align data start sector to erase block boundary (for flash memory media) */
        if (disk_ioctl(pdrv, GET_BLOCK_SIZE, &n) != RES_OK || !n || n > 32768) n = 1;
        n = (b_data + n - 1) & ~(n - 1);        /* Next nearest erase block from current data start */
        n = (n - b_data) / N_FATS;
        if (fmt == FS_FAT32) {          /* FAT32: Move FAT offset */
                n_rsv += n;
                b_fat += n;
        } else {                                        /* FAT12/16: Expand FAT size */
                n_fat += n;
        }

        /* Determine number of clusters and final check of validity of the FAT sub-type */
        n_clst = (n_vol - n_rsv - n_fat * N_FATS - n_dir) / au;
        if (   (fmt == FS_FAT16 && n_clst < MIN_FAT16)
                || (fmt == FS_FAT32 && n_clst < MIN_FAT32))
                return FR_MKFS_ABORTED;

        /* Determine system ID in the partition table */
        if (fmt == FS_FAT32) {
                sys = 0x0C;             /* FAT32X */
        } else {
                if (fmt == FS_FAT12 && n_vol < 0x10000) {
                        sys = 0x01;     /* FAT12(<65536) */
                } else {
                        sys = (n_vol < 0x10000) ? 0x04 : 0x06;  /* FAT16(<65536) : FAT12/16(>=65536) */
                }
        }

        if (_MULTI_PARTITION && part) {
                /* Update system ID in the partition table */
                tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];
                tbl[4] = sys;
                if (disk_write(pdrv, fs->win, 0, 1))    /* Write it to teh MBR */
                        return FR_DISK_ERR;
                md = 0xF8;
        } else {
                if (sfd) {      /* No partition table (SFD) */
                        md = 0xF0;
                } else {        /* Create partition table (FDISK) */
                        mem_set(fs->win, 0, SS(fs));
                        tbl = fs->win+MBR_Table;        /* Create partition table for single partition in the drive */
                        tbl[1] = 1;                                             /* Partition start head */
                        tbl[2] = 1;                                             /* Partition start sector */
                        tbl[3] = 0;                                             /* Partition start cylinder */
                        tbl[4] = sys;                                   /* System type */
                        tbl[5] = 254;                                   /* Partition end head */
                        n = (b_vol + n_vol) / 63 / 255;
                        tbl[6] = (BYTE)(n >> 2 | 63);   /* Partition end sector */
                        tbl[7] = (BYTE)n;                               /* End cylinder */
                        ST_DWORD(tbl+8, 63);                    /* Partition start in LBA */
                        ST_DWORD(tbl+12, n_vol);                /* Partition size in LBA */
                        ST_WORD(fs->win+BS_55AA, 0xAA55);       /* MBR signature */
                        if (disk_write(pdrv, fs->win, 0, 1))    /* Write it to the MBR */
                                return FR_DISK_ERR;
                        md = 0xF8;
                }
        }

        /* Create BPB in the VBR */
        tbl = fs->win;                                                  /* Clear sector */
        mem_set(tbl, 0, SS(fs));
        mem_cpy(tbl, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code, OEM name */
        i = SS(fs);                                                             /* Sector size */
        ST_WORD(tbl+BPB_BytsPerSec, i);
        tbl[BPB_SecPerClus] = (BYTE)au;                 /* Sectors per cluster */
        ST_WORD(tbl+BPB_RsvdSecCnt, n_rsv);             /* Reserved sectors */
        tbl[BPB_NumFATs] = N_FATS;                              /* Number of FATs */
        i = (fmt == FS_FAT32) ? 0 : N_ROOTDIR;  /* Number of root directory entries */
        ST_WORD(tbl+BPB_RootEntCnt, i);
        if (n_vol < 0x10000) {                                  /* Number of total sectors */
                ST_WORD(tbl+BPB_TotSec16, n_vol);
        } else {
                ST_DWORD(tbl+BPB_TotSec32, n_vol);
        }
        tbl[BPB_Media] = md;                                    /* Media descriptor */
        ST_WORD(tbl+BPB_SecPerTrk, 63);                 /* Number of sectors per track */
        ST_WORD(tbl+BPB_NumHeads, 255);                 /* Number of heads */
        ST_DWORD(tbl+BPB_HiddSec, b_vol);               /* Hidden sectors */
        n = get_fattime();                                              /* Use current time as VSN */
        if (fmt == FS_FAT32) {
                ST_DWORD(tbl+BS_VolID32, n);            /* VSN */
                ST_DWORD(tbl+BPB_FATSz32, n_fat);       /* Number of sectors per FAT */
                ST_DWORD(tbl+BPB_RootClus, 2);          /* Root directory start cluster (2) */
                ST_WORD(tbl+BPB_FSInfo, 1);                     /* FSINFO record offset (VBR+1) */
                ST_WORD(tbl+BPB_BkBootSec, 6);          /* Backup boot record offset (VBR+6) */
                tbl[BS_DrvNum32] = 0x80;                        /* Drive number */
                tbl[BS_BootSig32] = 0x29;                       /* Extended boot signature */
                mem_cpy(tbl+BS_VolLab32, "NO NAME    " "FAT32   ", 19); /* Volume label, FAT signature */
        } else {
                ST_DWORD(tbl+BS_VolID, n);                      /* VSN */
                ST_WORD(tbl+BPB_FATSz16, n_fat);        /* Number of sectors per FAT */
                tbl[BS_DrvNum] = 0x80;                          /* Drive number */
                tbl[BS_BootSig] = 0x29;                         /* Extended boot signature */
                mem_cpy(tbl+BS_VolLab, "NO NAME    " "FAT     ", 19);   /* Volume label, FAT signature */
        }
        ST_WORD(tbl+BS_55AA, 0xAA55);                   /* Signature (Offset is fixed here regardless of sector size) */
        if (disk_write(pdrv, tbl, b_vol, 1))    /* Write it to the VBR sector */
                return FR_DISK_ERR;
        if (fmt == FS_FAT32)                                    /* Write backup VBR if needed (VBR+6) */
                disk_write(pdrv, tbl, b_vol + 6, 1);

        /* Initialize FAT area */
        wsect = b_fat;
        for (i = 0; i < N_FATS; i++) {          /* Initialize each FAT copy */
                mem_set(tbl, 0, SS(fs));                        /* 1st sector of the FAT  */
                n = md;                                                         /* Media descriptor byte */
                if (fmt != FS_FAT32) {
                        n |= (fmt == FS_FAT12) ? 0x00FFFF00 : 0xFFFFFF00;
                        ST_DWORD(tbl+0, n);                             /* Reserve cluster #0-1 (FAT12/16) */
                } else {
                        n |= 0xFFFFFF00;
                        ST_DWORD(tbl+0, n);                             /* Reserve cluster #0-1 (FAT32) */
                        ST_DWORD(tbl+4, 0xFFFFFFFF);
                        ST_DWORD(tbl+8, 0x0FFFFFFF);    /* Reserve cluster #2 for root directory */
                }
                if (disk_write(pdrv, tbl, wsect++, 1))
                        return FR_DISK_ERR;
                mem_set(tbl, 0, SS(fs));                        /* Fill following FAT entries with zero */
                for (n = 1; n < n_fat; n++) {           /* This loop may take a time on FAT32 volume due to many single sector writes */
                        if (disk_write(pdrv, tbl, wsect++, 1))
                                return FR_DISK_ERR;
                }
        }

        /* Initialize root directory */
        i = (fmt == FS_FAT32) ? au : (UINT)n_dir;
        do {
                if (disk_write(pdrv, tbl, wsect++, 1))
                        return FR_DISK_ERR;
        } while (--i);

#if _USE_ERASE  /* Erase data area if needed */
        {
                DWORD eb[2];

                eb[0] = wsect; eb[1] = wsect + (n_clst - ((fmt == FS_FAT32) ? 1 : 0)) * au - 1;
                disk_ioctl(pdrv, CTRL_ERASE_SECTOR, eb);
        }
#endif

        /* Create FSINFO if needed */
        if (fmt == FS_FAT32) {
                ST_DWORD(tbl+FSI_LeadSig, 0x41615252);
                ST_DWORD(tbl+FSI_StrucSig, 0x61417272);
                ST_DWORD(tbl+FSI_Free_Count, n_clst - 1);       /* Number of free clusters */
                ST_DWORD(tbl+FSI_Nxt_Free, 2);                          /* Last allocated cluster# */
                ST_WORD(tbl+BS_55AA, 0xAA55);
                disk_write(pdrv, tbl, b_vol + 1, 1);    /* Write original (VBR+1) */
                disk_write(pdrv, tbl, b_vol + 7, 1);    /* Write backup (VBR+7) */
        }

        return (disk_ioctl(pdrv, CTRL_SYNC, 0) == RES_OK) ? FR_OK : FR_DISK_ERR;
}



#if _MULTI_PARTITION
/*-----------------------------------------------------------------------*/
/* Divide Physical Drive                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_fdisk (
        BYTE pdrv,                      /* Physical drive number */
        const DWORD szt[],      /* Pointer to the size table for each partitions */
        void* work                      /* Pointer to the working buffer */
)
{
        UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
        BYTE s_hd, e_hd, *p, *buf = (BYTE*)work;
        DSTATUS stat;
        DWORD sz_disk, sz_part, s_part;


        stat = disk_initialize(pdrv);
        if (stat & STA_NOINIT) return FR_NOT_READY;
        if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
        if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;

        /* Determine CHS in the table regardless of the drive geometry */
        for (n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
        if (n == 256) n--;
        e_hd = n - 1;
        sz_cyl = 63 * n;
        tot_cyl = sz_disk / sz_cyl;

        /* Create partition table */
        mem_set(buf, 0, _MAX_SS);
        p = buf + MBR_Table; b_cyl = 0;
        for (i = 0; i < 4; i++, p += SZ_PTE) {
                p_cyl = (szt[i] <= 100U) ? (DWORD)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl;
                if (!p_cyl) continue;
                s_part = (DWORD)sz_cyl * b_cyl;
                sz_part = (DWORD)sz_cyl * p_cyl;
                if (i == 0) {   /* Exclude first track of cylinder 0 */
                        s_hd = 1;
                        s_part += 63; sz_part -= 63;
                } else {
                        s_hd = 0;
                }
                e_cyl = b_cyl + p_cyl - 1;
                if (e_cyl >= tot_cyl) return FR_INVALID_PARAMETER;

                /* Set partition table */
                p[1] = s_hd;                                            /* Start head */
                p[2] = (BYTE)((b_cyl >> 2) + 1);        /* Start sector */
                p[3] = (BYTE)b_cyl;                                     /* Start cylinder */
                p[4] = 0x06;                                            /* System type (temporary setting) */
                p[5] = e_hd;                                            /* End head */
                p[6] = (BYTE)((e_cyl >> 2) + 63);       /* End sector */
                p[7] = (BYTE)e_cyl;                                     /* End cylinder */
                ST_DWORD(p + 8, s_part);                        /* Start sector in LBA */
                ST_DWORD(p + 12, sz_part);                      /* Partition size */

                /* Next partition */
                b_cyl += p_cyl;
        }
        ST_WORD(p, 0xAA55);

        /* Write it to the MBR */
        return (disk_write(pdrv, buf, 0, 1) || disk_ioctl(pdrv, CTRL_SYNC, 0)) ? FR_DISK_ERR : FR_OK;
}


#endif /* _MULTI_PARTITION */
#endif /* _USE_MKFS && !_FS_READONLY */




#if _USE_STRFUNC
/*-----------------------------------------------------------------------*/
/* Get a string from the file                                            */
/*-----------------------------------------------------------------------*/

TCHAR* f_gets (
        TCHAR* buff,    /* Pointer to the string buffer to read */
        int len,                /* Size of string buffer (characters) */
        FIL* fp                 /* Pointer to the file object */
)
{
        int n = 0;
        TCHAR c, *p = buff;
        BYTE s[2];
        UINT rc;


        while (n < len - 1) {   /* Read characters until buffer gets filled */
#if _USE_LFN && _LFN_UNICODE
#if _STRF_ENCODE == 3           /* Read a character in UTF-8 */
                f_read(fp, s, 1, &rc);
                if (rc != 1) break;
                c = s[0];
                if (c >= 0x80) {
                        if (c < 0xC0) continue; /* Skip stray trailer */
                        if (c < 0xE0) {                 /* Two-byte sequence */
                                f_read(fp, s, 1, &rc);
                                if (rc != 1) break;
                                c = (c & 0x1F) << 6 | (s[0] & 0x3F);
                                if (c < 0x80) c = '?';
                        } else {
                                if (c < 0xF0) {         /* Three-byte sequence */
                                        f_read(fp, s, 2, &rc);
                                        if (rc != 2) break;
                                        c = c << 12 | (s[0] & 0x3F) << 6 | (s[1] & 0x3F);
                                        if (c < 0x800) c = '?';
                                } else {                        /* Reject four-byte sequence */
                                        c = '?';
                                }
                        }
                }
#elif _STRF_ENCODE == 2         /* Read a character in UTF-16BE */
                f_read(fp, s, 2, &rc);
                if (rc != 2) break;
                c = s[1] + (s[0] << 8);
#elif _STRF_ENCODE == 1         /* Read a character in UTF-16LE */
                f_read(fp, s, 2, &rc);
                if (rc != 2) break;
                c = s[0] + (s[1] << 8);
#else                                           /* Read a character in ANSI/OEM */
                f_read(fp, s, 1, &rc);
                if (rc != 1) break;
                c = s[0];
                if (IsDBCS1(c)) {
                        f_read(fp, s, 1, &rc);
                        if (rc != 1) break;
                        c = (c << 8) + s[0];
                }
                c = ff_convert(c, 1);   /* OEM -> Unicode */
                if (!c) c = '?';
#endif
#else                                           /* Read a character without conversion */
                f_read(fp, s, 1, &rc);
                if (rc != 1) break;
                c = s[0];
#endif
                if (_USE_STRFUNC == 2 && c == '\r') continue;   /* Strip '\r' */
                *p++ = c;
                n++;
                if (c == '\n') break;           /* Break on EOL */
        }
        *p = 0;
        return n ? buff : 0;                    /* When no data read (eof or error), return with error. */
}



#if !_FS_READONLY
#include <stdarg.h>
/*-----------------------------------------------------------------------*/
/* Put a character to the file                                           */
/*-----------------------------------------------------------------------*/

typedef struct {
        FIL* fp;
        int idx, nchr;
        BYTE buf[64];
} putbuff;


static
void putc_bfd (
        putbuff* pb,
        TCHAR c
)
{
        UINT bw;
        int i;


        if (_USE_STRFUNC == 2 && c == '\n')      /* LF -> CRLF conversion */
                putc_bfd(pb, '\r');

        i = pb->idx;    /* Buffer write index (-1:error) */
        if (i < 0) return;

#if _USE_LFN && _LFN_UNICODE
#if _STRF_ENCODE == 3                   /* Write a character in UTF-8 */
        if (c < 0x80) {                         /* 7-bit */
                pb->buf[i++] = (BYTE)c;
        } else {
                if (c < 0x800) {                /* 11-bit */
                        pb->buf[i++] = (BYTE)(0xC0 | c >> 6);
                } else {                                /* 16-bit */
                        pb->buf[i++] = (BYTE)(0xE0 | c >> 12);
                        pb->buf[i++] = (BYTE)(0x80 | (c >> 6 & 0x3F));
                }
                pb->buf[i++] = (BYTE)(0x80 | (c & 0x3F));
        }
#elif _STRF_ENCODE == 2                 /* Write a character in UTF-16BE */
        pb->buf[i++] = (BYTE)(c >> 8);
        pb->buf[i++] = (BYTE)c;
#elif _STRF_ENCODE == 1                 /* Write a character in UTF-16LE */
        pb->buf[i++] = (BYTE)c;
        pb->buf[i++] = (BYTE)(c >> 8);
#else                                                   /* Write a character in ANSI/OEM */
        c = ff_convert(c, 0);   /* Unicode -> OEM */
        if (!c) c = '?';
        if (c >= 0x100)
                pb->buf[i++] = (BYTE)(c >> 8);
        pb->buf[i++] = (BYTE)c;
#endif
#else                                                   /* Write a character without conversion */
        pb->buf[i++] = (BYTE)c;
#endif

        if (i >= (int)(sizeof pb->buf) - 3) {   /* Write buffered characters to the file */
                f_write(pb->fp, pb->buf, (UINT)i, &bw);
                i = (bw == (UINT)i) ? 0 : -1;
        }
        pb->idx = i;
        pb->nchr++;
}



int f_putc (
        TCHAR c,        /* A character to be output */
        FIL* fp         /* Pointer to the file object */
)
{
        putbuff pb;
        UINT nw;


        pb.fp = fp;                     /* Initialize output buffer */
        pb.nchr = pb.idx = 0;

        putc_bfd(&pb, c);       /* Put a character */

        if (   pb.idx >= 0      /* Flush buffered characters to the file */
                && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
                && (UINT)pb.idx == nw) return pb.nchr;
        return EOF;
}




/*-----------------------------------------------------------------------*/
/* Put a string to the file                                              */
/*-----------------------------------------------------------------------*/

int f_puts (
        const TCHAR* str,       /* Pointer to the string to be output */
        FIL* fp                         /* Pointer to the file object */
)
{
        putbuff pb;
        UINT nw;


        pb.fp = fp;                             /* Initialize output buffer */
        pb.nchr = pb.idx = 0;

        while (*str)                    /* Put the string */
                putc_bfd(&pb, *str++);

        if (   pb.idx >= 0              /* Flush buffered characters to the file */
                && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
                && (UINT)pb.idx == nw) return pb.nchr;
        return EOF;
}




/*-----------------------------------------------------------------------*/
/* Put a formatted string to the file                                    */
/*-----------------------------------------------------------------------*/

int f_printf (
        FIL* fp,                        /* Pointer to the file object */
        const TCHAR* fmt,       /* Pointer to the format string */
        ...                                     /* Optional arguments... */
)
{
        va_list arp;
        BYTE f, r;
        UINT nw, i, j, w;
        DWORD v;
        TCHAR c, d, s[16], *p;
        putbuff pb;


        pb.fp = fp;                             /* Initialize output buffer */
        pb.nchr = pb.idx = 0;

        va_start(arp, fmt);

        for (;;) {
                c = *fmt++;
                if (c == 0) break;                      /* End of string */
                if (c != '%') {                         /* Non escape character */
                        putc_bfd(&pb, c);
                        continue;
                }
                w = f = 0;
                c = *fmt++;
                if (c == '0') {                         /* Flag: '0' padding */
                        f = 1; c = *fmt++;
                } else {
                        if (c == '-') {                 /* Flag: left justified */
                                f = 2; c = *fmt++;
                        }
                }
                while (IsDigit(c)) {            /* Precision */
                        w = w * 10 + c - '0';
                        c = *fmt++;
                }
                if (c == 'l' || c == 'L') {     /* Prefix: Size is long int */
                        f |= 4; c = *fmt++;
                }
                if (!c) break;
                d = c;
                if (IsLower(d)) d -= 0x20;
                switch (d) {                            /* Type is... */
                case 'S' :                                      /* String */
                        p = va_arg(arp, TCHAR*);
                        for (j = 0; p[j]; j++) ;
                        if (!(f & 2)) {
                                while (j++ < w) putc_bfd(&pb, ' ');
                        }
                        while (*p) putc_bfd(&pb, *p++);
                        while (j++ < w) putc_bfd(&pb, ' ');
                        continue;
                case 'C' :                                      /* Character */
                        putc_bfd(&pb, (TCHAR)va_arg(arp, int)); continue;
                case 'B' :                                      /* Binary */
                        r = 2; break;
                case 'O' :                                      /* Octal */
                        r = 8; break;
                case 'D' :                                      /* Signed decimal */
                case 'U' :                                      /* Unsigned decimal */
                        r = 10; break;
                case 'X' :                                      /* Hexdecimal */
                        r = 16; break;
                default:                                        /* Unknown type (pass-through) */
                        putc_bfd(&pb, c); continue;
                }

                /* Get an argument and put it in numeral */
                v = (f & 4) ? (DWORD)va_arg(arp, long) : ((d == 'D') ? (DWORD)(long)va_arg(arp, int) : (DWORD)va_arg(arp, unsigned int));
                if (d == 'D' && (v & 0x80000000)) {
                        v = 0 - v;
                        f |= 8;
                }
                i = 0;
                do {
                        d = (TCHAR)(v % r); v /= r;
                        if (d > 9) d += (c == 'x') ? 0x27 : 0x07;
                        s[i++] = d + '0';
                } while (v && i < sizeof s / sizeof s[0]);
                if (f & 8) s[i++] = '-';
                j = i; d = (f & 1) ? '0' : ' ';
                while (!(f & 2) && j++ < w) putc_bfd(&pb, d);
                do putc_bfd(&pb, s[--i]); while (i);
                while (j++ < w) putc_bfd(&pb, d);
        }

        va_end(arp);

        if (   pb.idx >= 0              /* Flush buffered characters to the file */
                && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
                && (UINT)pb.idx == nw) return pb.nchr;
        return EOF;
}

#endif /* !_FS_READONLY */
#endif /* _USE_STRFUNC */