ff.c

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/*----------------------------------------------------------------------------/
/  FatFs - FAT file system module  R0.09a                 (C)ChaN, 2012
/-----------------------------------------------------------------------------/
/ 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) 2012, 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 char.
/ Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h.
/                   Fixed f_unlink() fails to remove a sub-dir on _FS_RPATH.
/                   Fixed name matching error on the 13 char boundary.
/                   Added a configuration option, _LFN_UNICODE.
/                   Changed f_readdir() to return the SFN with always upper case on non-LFN cfg.
/
/ May 15,'10 R0.08  Added a memory configuration option. (_USE_LFN = 3)
/                   Added file lock feature. (_FS_SHARE)
/                   Added fast seek feature. (_USE_FASTSEEK)
/                   Changed some types on the API, XCHAR->TCHAR.
/                   Changed fname member in the FILINFO structure on Unicode cfg.
/                   String functions support UTF-8 encoding files on Unicode cfg.
/ Aug 16,'10 R0.08a Added f_getcwd(). (_FS_RPATH = 2)
/                   Added sector erase feature. (_USE_ERASE)
/                   Moved file lock semaphore table from fs object to the bss.
/                   Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'.
/                   Fixed f_mkfs() creates wrong FAT32 volume.
/ 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 function.
/                   Ignores duplicated directory separators in given path name.
/
/ Sep 06,'11 R0.09  f_mkfs() supports multiple partition to finish the multiple partition feature.
/                   Added f_fdisk(). (_MULTI_PARTITION = 2)
/ Aug 27,'12 R0.09a Fixed assertion failure due to OS/2 EA on FAT12/16 volume.
/                   Changed f_open() and f_opendir reject null object pointer to avoid crash.
/                   Changed option name _FS_SHARE to _FS_LOCK.
/---------------------------------------------------------------------------*/

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


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

   Module Private Definitions

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

#if _FATFS != 4004 /* Revision ID */
#error Wrong include file (ff.h).
#endif


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


/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area must not be used in re-entrant configuration.
#endif
#define ENTER_FF(fs)  { if (!lock_fs(fs)) return FR_TIMEOUT; }
#define LEAVE_FF(fs, res) { unlock_fs(fs, res); return res; }
#else
#define ENTER_FF(fs)
#define LEAVE_FF(fs, res) return res
#endif

#define ABORT(fs, res)  { fp->flag |= FA__ERROR; LEAVE_FF(fs, res); }


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



/* DBCS code ranges and SBCS extend char 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 */
/* Note that the FAT spec by Microsoft says 4085 but Windows works with 4087! */
#define MIN_FAT16 4086 /* Minimum number of clusters for FAT16 */
#define MIN_FAT32 65526 /* Minimum number of clusters for FAT32 */


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

#define BS_jmpBoot   0 /* Jump instruction (3) */
#define BS_OEMName   3 /* OEM name (8) */
#define BPB_BytsPerSec  11 /* Sector size [byte] (2) */
#define BPB_SecPerClus  13 /* Cluster size [sector] (1) */
#define BPB_RsvdSecCnt  14 /* Size of reserved area [sector] (2) */
#define BPB_NumFATs   16 /* Number of FAT copies (1) */
#define BPB_RootEntCnt  17 /* Number of root dir entries for FAT12/16 (2) */
#define BPB_TotSec16  19 /* Volume size [sector] (2) */
#define BPB_Media   21 /* Media descriptor (1) */
#define BPB_FATSz16   22 /* FAT size [sector] (2) */
#define BPB_SecPerTrk  24 /* Track size [sector] (2) */
#define BPB_NumHeads  26 /* Number of heads (2) */
#define BPB_HiddSec   28 /* Number of special hidden sectors (4) */
#define BPB_TotSec32  32 /* Volume size [sector] (4) */
#define BS_DrvNum   36 /* Physical drive number (2) */
#define BS_BootSig   38 /* Extended boot signature (1) */
#define BS_VolID   39 /* Volume serial number (4) */
#define BS_VolLab   43 /* Volume label (8) */
#define BS_FilSysType  54 /* File system type (1) */
#define BPB_FATSz32   36 /* FAT size [sector] (4) */
#define BPB_ExtFlags  40 /* Extended flags (2) */
#define BPB_FSVer   42 /* File system version (2) */
#define BPB_RootClus  44 /* Root dir first cluster (4) */
#define BPB_FSInfo   48 /* Offset of FSInfo sector (2) */
#define BPB_BkBootSec  50 /* Offset of backup boot 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 /* Boot sector signature (2) */

#define DIR_Name   0 /* Short file name (11) */
#define DIR_Attr   11 /* Attribute (1) */
#define DIR_NTres   12 /* NT flag (1) */
#define DIR_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_T   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
/  zeroed/nulled at start-up. If not, the compiler or start-up
/  routine is out of ANSI-C standard.
*/

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

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

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

#if _FS_LOCK
static
FILESEM Files[_FS_LOCK]; /* File 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




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

   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* dj,  /* Directory object pointing the file to be checked */
 int acc   /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
)
{
 UINT i, be;

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

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


static
int enq_lock (void) /* Check if an entry is available for a new file */
{
 UINT i;

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


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


 for (i = 0; i < _FS_LOCK; i++) { /* Find the file */
  if (Files[i].fs == dj->fs &&
   Files[i].clu == dj->sclust &&
   Files[i].idx == dj->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 space to register (int err) */
  Files[i].fs = dj->fs;
  Files[i].clu = dj->sclust;
  Files[i].idx = dj->index;
  Files[i].ctr = 0;
 }

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

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

 return i + 1;
}


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


 if (--i < _FS_LOCK) {
  n = Files[i].ctr;
  if (n == 0x100) n = 0;
  if (n) n--;
  Files[i].ctr = n;
  if (!n) Files[i].fs = 0;
  res = FR_OK;
 } else {
  res = FR_INT_ERR;
 }
 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



/*-----------------------------------------------------------------------*/
/* Change window offset                                                  */
/*-----------------------------------------------------------------------*/

static
FRESULT move_window (
 FATFS *fs,  /* File system object */
 DWORD sector /* Sector number to make appearance in the fs->win[] */
)     /* Move to zero only writes back dirty window */
{
 DWORD wsect;


 wsect = fs->winsect;
 if (wsect != sector) { /* Changed current window */
#if !_FS_READONLY
  if (fs->wflag) { /* Write back dirty window if needed */
   if (disk_write(fs->drv, fs->win, wsect, 1) != RES_OK)
    return FR_DISK_ERR;
   fs->wflag = 0;
   if (wsect < (fs->fatbase + fs->fsize)) { /* In FAT area */
    BYTE nf;
    for (nf = fs->n_fats; nf > 1; nf--) { /* Reflect the change to all FAT copies */
     wsect += fs->fsize;
     disk_write(fs->drv, fs->win, wsect, 1);
    }
   }
  }
#endif
  if (sector) {
   if (disk_read(fs->drv, fs->win, sector, 1) != RES_OK)
    return FR_DISK_ERR;
   fs->winsect = sector;
  }
 }

 return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Clean-up cached data                                                  */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync ( /* FR_OK: successful, FR_DISK_ERR: failed */
 FATFS *fs /* File system object */
)
{
 FRESULT res;


 res = move_window(fs, 0);
 if (res == FR_OK) {
  /* Update FSInfo sector if needed */
  if (fs->fs_type == FS_FAT32 && fs->fsi_flag) {
   fs->winsect = 0;
   /* Create FSInfo structure */
   mem_set(fs->win, 0, 512);
   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 */
   disk_write(fs->drv, fs->win, fs->fsi_sector, 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;
 }

 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;   /* It is an invalid cluster */
  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) {  /* 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 *dj,  /* Pointer to directory object */
 WORD idx  /* Index of directory table */
)
{
 DWORD clst;
 WORD ic;


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

 if (clst == 0) { /* Static table (root-dir in FAT12/16) */
  dj->clust = clst;
  if (idx >= dj->fs->n_rootdir)  /* Index is out of range */
   return FR_INT_ERR;
  dj->sect = dj->fs->dirbase + idx / (SS(dj->fs) / SZ_DIR); /* Sector# */
 }
 else {    /* Dynamic table (sub-dirs or root-dir in FAT32) */
  ic = SS(dj->fs) / SZ_DIR * dj->fs->csize; /* Entries per cluster */
  while (idx >= ic) { /* Follow cluster chain */
   clst = get_fat(dj->fs, clst);    /* Get next cluster */
   if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
   if (clst < 2 || clst >= dj->fs->n_fatent) /* Reached to end of table or int error */
    return FR_INT_ERR;
   idx -= ic;
  }
  dj->clust = clst;
  dj->sect = clust2sect(dj->fs, clst) + idx / (SS(dj->fs) / SZ_DIR); /* Sector# */
 }

 dj->dir = dj->fs->win + (idx % (SS(dj->fs) / SZ_DIR)) * SZ_DIR; /* Ptr to the entry in the sector */

 return FR_OK; /* Seek succeeded */
}




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

static
FRESULT dir_next ( /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not stretch */
 DIR *dj,  /* Pointer to directory object */
 int stretch  /* 0: Do not stretch table, 1: Stretch table if needed */
)
{
 DWORD clst;
 WORD i;


 stretch = stretch;  /* To suppress warning on read-only cfg. */
 i = dj->index + 1;
 if (!i || !dj->sect) /* Report EOT when index has reached 65535 */
  return FR_NO_FILE;

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

  if (dj->clust == 0) { /* Static table */
   if (i >= dj->fs->n_rootdir) /* Report EOT when end of table */
    return FR_NO_FILE;
  }
  else {     /* Dynamic table */
   if (((i / (SS(dj->fs) / SZ_DIR)) & (dj->fs->csize - 1)) == 0) { /* Cluster changed? */
    clst = get_fat(dj->fs, dj->clust);    /* Get next cluster */
    if (clst <= 1) return FR_INT_ERR;
    if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
    if (clst >= dj->fs->n_fatent) {     /* When it reached end of dynamic table */
#if !_FS_READONLY
     BYTE c;
     if (!stretch) return FR_NO_FILE;   /* When do not stretch, report EOT */
     clst = create_chain(dj->fs, dj->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 (move_window(dj->fs, 0)) return FR_DISK_ERR; /* Flush active window */
     mem_set(dj->fs->win, 0, SS(dj->fs));   /* Clear window buffer */
     dj->fs->winsect = clust2sect(dj->fs, clst); /* Cluster start sector */
     for (c = 0; c < dj->fs->csize; c++) {  /* Fill the new cluster with 0 */
      dj->fs->wflag = 1;
      if (move_window(dj->fs, 0)) return FR_DISK_ERR;
      dj->fs->winsect++;
     }
     dj->fs->winsect -= c;      /* Rewind window address */
#else
     return FR_NO_FILE;   /* Report EOT */
#endif
    }
    dj->clust = clst;    /* Initialize data for new cluster */
    dj->sect = clust2sect(dj->fs, clst);
   }
  }
 }

 dj->index = i;
 dj->dir = dj->fs->win + (i % (SS(dj->fs) / SZ_DIR)) * SZ_DIR;

 return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* 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 chars 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 char 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 chars 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 char 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_T] = 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 char */
  ST_WORD(dir+LfnOfs[s], wc); /* Put it */
  if (!wc) wc = 0xFFFF;  /* Padding chars following last char */
 } 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
void gen_numname (
 BYTE *dst,   /* Pointer to generated SFN */
 const BYTE *src, /* Pointer to source SFN to be modified */
 const WCHAR *lfn, /* Pointer to LFN */
 WORD 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 */
  do seq = (seq >> 1) + (seq << 15) + (WORD)*lfn++; while (*lfn);
 }

 /* 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  /* Ptr to directory 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 *dj   /* 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(dj, 0);   /* Rewind directory object */
 if (res != FR_OK) return res;

#if _USE_LFN
 ord = sum = 0xFF;
#endif
 do {
  res = move_window(dj->fs, dj->sect);
  if (res != FR_OK) break;
  dir = dj->dir;     /* Ptr to the directory entry of current index */
  c = dir[DIR_Name];
  if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */
#if _USE_LFN /* LFN configuration */
  a = dir[DIR_Attr] & AM_MASK;
  if (c == DDE || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */
   ord = 0xFF;
  } else {
   if (a == AM_LFN) {   /* An LFN entry is found */
    if (dj->lfn) {
     if (c & LLE) {  /* Is it start of LFN sequence? */
      sum = dir[LDIR_Chksum];
      c &= ~LLE; ord = c; /* LFN start order */
      dj->lfn_idx = dj->index;
     }
     /* Check validity of the LFN entry and compare it with given name */
     ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
    }
   } else {     /* An SFN entry is found */
    if (!ord && sum == sum_sfn(dir)) break; /* LFN matched? */
    ord = 0xFF; dj->lfn_idx = 0xFFFF; /* Reset LFN sequence */
    if (!(dj->fn[NS] & NS_LOSS) && !mem_cmp(dir, dj->fn, 11)) break; /* SFN matched? */
   }
  }
#else  /* Non LFN configuration */
  if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */
   break;
#endif
  res = dir_next(dj, 0);  /* Next entry */
 } while (res == FR_OK);

 return res;
}




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

 res = FR_NO_FILE;
 while (dj->sect) {
  res = move_window(dj->fs, dj->sect);
  if (res != FR_OK) break;
  dir = dj->dir;     /* Ptr to the directory entry of current index */
  c = dir[DIR_Name];
  if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */
#if _USE_LFN /* LFN configuration */
  a = dir[DIR_Attr] & AM_MASK;
  if (c == DDE || (!_FS_RPATH && c == '.') || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */
   ord = 0xFF;
  } else {
   if (a == AM_LFN) {   /* An LFN entry is found */
    if (c & LLE) {   /* Is it start of LFN sequence? */
     sum = dir[LDIR_Chksum];
     c &= ~LLE; ord = c;
     dj->lfn_idx = dj->index;
    }
    /* Check LFN validity and capture it */
    ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
   } else {     /* An SFN entry is found */
    if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN? */
     dj->lfn_idx = 0xFFFF;  /* It has no LFN. */
    break;
   }
  }
#else  /* Non LFN configuration */
  if (c != DDE && (_FS_RPATH || c != '.') && !(dir[DIR_Attr] & AM_VOL)) /* Is it a valid entry? */
   break;
#endif
  res = dir_next(dj, 0);    /* Next entry */
  if (res != FR_OK) break;
 }

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

 return res;
}
#endif



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


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

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

 if (sn[NS] & NS_LOSS) {   /* When LFN is out of 8.3 format, generate a numbered name */
  fn[NS] = 0; dj->lfn = 0;   /* Find only SFN */
  for (n = 1; n < 100; n++) {
   gen_numname(fn, sn, lfn, n); /* Generate a numbered name */
   res = dir_find(dj);    /* Check if the name collides with existing SFN */
   if (res != FR_OK) break;
  }
  if (n == 100) return FR_DENIED;  /* Abort if too many collisions */
  if (res != FR_NO_FILE) return res; /* Abort if the result is other than 'not collided' */
  fn[NS] = sn[NS]; dj->lfn = lfn;
 }

 if (sn[NS] & NS_LFN) {   /* When LFN is to be created, reserve an SFN + LFN entries. */
  for (ne = 0; lfn[ne]; ne++) ;
  ne = (ne + 25) / 13;
 } else {      /* Otherwise reserve only an SFN entry. */
  ne = 1;
 }

 /* Reserve contiguous entries */
 res = dir_sdi(dj, 0);
 if (res != FR_OK) return res;
 n = is = 0;
 do {
  res = move_window(dj->fs, dj->sect);
  if (res != FR_OK) break;
  c = *dj->dir;    /* Check the entry status */
  if (c == DDE || c == 0) { /* Is it a blank entry? */
   if (n == 0) is = dj->index; /* First index of the contiguous entry */
   if (++n == ne) break; /* A contiguous entry that required count is found */
  } else {
   n = 0;     /* Not a blank entry. Restart to search */
  }
  res = dir_next(dj, 1);  /* Next entry with table stretch */
 } while (res == FR_OK);

 if (res == FR_OK && ne > 1) { /* Initialize LFN entry if needed */
  res = dir_sdi(dj, is);
  if (res == FR_OK) {
   sum = sum_sfn(dj->fn); /* Sum of the SFN tied to the LFN */
   ne--;
   do {     /* Store LFN entries in bottom first */
    res = move_window(dj->fs, dj->sect);
    if (res != FR_OK) break;
    fit_lfn(dj->lfn, dj->dir, (BYTE)ne, sum);
    dj->fs->wflag = 1;
    res = dir_next(dj, 0); /* Next entry */
   } while (res == FR_OK && --ne);
  }
 }

#else /* Non LFN configuration */
 res = dir_sdi(dj, 0);
 if (res == FR_OK) {
  do { /* Find a blank entry for the SFN */
   res = move_window(dj->fs, dj->sect);
   if (res != FR_OK) break;
   c = *dj->dir;
   if (c == DDE || c == 0) break; /* Is it a blank entry? */
   res = dir_next(dj, 1);   /* Next entry with table stretch */
  } while (res == FR_OK);
 }
#endif

 if (res == FR_OK) {  /* Initialize the SFN entry */
  res = move_window(dj->fs, dj->sect);
  if (res == FR_OK) {
   dir = dj->dir;
   mem_set(dir, 0, SZ_DIR); /* Clean the entry */
   mem_cpy(dir, dj->fn, 11); /* Put SFN */
#if _USE_LFN
   dir[DIR_NTres] = *(dj->fn+NS) & (NS_BODY | NS_EXT); /* Put NT flag */
#endif
   dj->fs->wflag = 1;
  }
 }

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




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

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

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

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




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

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

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

 /* Create LFN in Unicode */
 for (p = *path; *p == '/' || *p == '\\'; p++) ; /* Strip duplicated separator */
 lfn = dj->lfn;
 si = di = 0;
 for (;;) {
  w = p[si++];     /* Get a character */
  if (w < ' ' || w == '/' || w == '\\') break; /* Break on end of segment */
  if (di >= _MAX_LFN)    /* Reject too long name */
   return FR_INVALID_NAME;
#if !_LFN_UNICODE
  w &= 0xFF;
  if (IsDBCS1(w)) {    /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
   b = (BYTE)p[si++];   /* Get 2nd byte */
   if (!IsDBCS2(b))
    return FR_INVALID_NAME; /* Reject invalid sequence */
   w = (w << 8) + b;   /* Create a DBC */
  }
  w = ff_convert(w, 1);   /* Convert ANSI/OEM to Unicode */
  if (!w) return FR_INVALID_NAME; /* Reject invalid code */
#endif
  if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) /* Reject illegal chars for LFN */
   return FR_INVALID_NAME;
  lfn[di++] = w;     /* Store the Unicode char */
 }
 *path = &p[si];      /* Return pointer to the next segment */
 cf = (w < ' ') ? NS_LAST : 0;  /* Set last segment flag if end of path */
#if _FS_RPATH
 if ((di == 1 && lfn[di-1] == '.') || /* Is this a dot entry? */
  (di == 2 && lfn[di-1] == '.' && lfn[di-2] == '.')) {
  lfn[di] = 0;
  for (i = 0; i < 11; i++)
   dj->fn[i] = (i < di) ? '.' : ' ';
  dj->fn[i] = cf | NS_DOT;  /* This is a dot entry */
  return FR_OK;
 }
#endif
 while (di) {      /* Strip trailing spaces and dots */
  w = lfn[di-1];
  if (w != ' ' && w != '.') break;
  di--;
 }
 if (!di) return FR_INVALID_NAME; /* Reject nul string */

 lfn[di] = 0;      /* LFN is created */

 /* Create SFN in directory form */
 mem_set(dj->fn, ' ', 11);
 for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++) ; /* Strip leading spaces and dots */
 if (si) cf |= NS_LOSS | NS_LFN;
 while (di && lfn[di - 1] != '.') di--; /* Find extension (di<=si: no extension) */

 b = i = 0; ni = 8;
 for (;;) {
  w = lfn[si++];     /* Get an LFN char */
  if (!w) break;     /* Break on end of the LFN */
  if (w == ' ' || (w == '.' && si != di)) { /* Remove spaces and dots */
   cf |= NS_LOSS | NS_LFN; continue;
  }

  if (i >= ni || si == di) {  /* Extension or end of SFN */
   if (ni == 11) {    /* Long extension */
    cf |= NS_LOSS | NS_LFN; break;
   }
   if (si != di) cf |= NS_LOSS | NS_LFN; /* Out of 8.3 format */
   if (si > di) break;   /* No extension */
   si = di; i = 8; ni = 11; /* Enter extension section */
   b <<= 2; continue;
  }

  if (w >= 0x80) {    /* Non ASCII char */
#ifdef _EXCVT
   w = ff_convert(w, 0);  /* Unicode -> OEM code */
   if (w) w = excvt[w - 0x80]; /* Convert extended char to upper (SBCS) */
#else
   w = ff_convert(ff_wtoupper(w), 0); /* Upper converted Unicode -> OEM code */
#endif
   cf |= NS_LFN;    /* Force create LFN entry */
  }

  if (_DF1S && w >= 0x100) {  /* Double byte char (always false on SBCS cfg) */
   if (i >= ni - 1) {
    cf |= NS_LOSS | NS_LFN; i = ni; continue;
   }
   dj->fn[i++] = (BYTE)(w >> 8);
  } else {      /* Single byte char */
   if (!w || chk_chr("+,;=[]", w)) { /* Replace illegal chars 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;
     }
    }
   }
  }
  dj->fn[i++] = (BYTE)w;
 }

 if (dj->fn[0] == DDE) dj->fn[0] = NDDE; /* If the first char 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 char, 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) */
 }

 dj->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 = dj->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 char? */
   b |= 3;      /* Eliminate NT flag */
#ifdef _EXCVT
   c = excvt[c - 0x80];  /* Upper conversion (SBCS) */
#else
#if !_DF1S /* ASCII only cfg */
   return FR_INVALID_NAME;
#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 char 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
}




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


 p = fno->fname;
 if (dj->sect) {
  dir = dj->dir;
  nt = dir[DIR_NTres];  /* NT flag */
  for (i = 0; i < 8; i++) { /* Copy name body */
   c = dir[i];
   if (c == ' ') break;
   if (c == NDDE) c = (TCHAR)DDE;
   if (_USE_LFN && (nt & NS_BODY) && IsUpper(c)) c += 0x20;
#if _LFN_UNICODE
   if (IsDBCS1(c) && i < 7 && IsDBCS2(dir[i+1]))
    c = (c << 8) | dir[++i];
   c = ff_convert(c, 1);
   if (!c) c = '?';
#endif
   *p++ = c;
  }
  if (dir[8] != ' ') {  /* Copy name extension */
   *p++ = '.';
   for (i = 8; i < 11; i++) {
    c = dir[i];
    if (c == ' ') break;
    if (_USE_LFN && (nt & NS_EXT) && IsUpper(c)) c += 0x20;
#if _LFN_UNICODE
    if (IsDBCS1(c) && i < 10 && IsDBCS2(dir[i+1]))
     c = (c << 8) | dir[++i];
    c = ff_convert(c, 1);
    if (!c) c = '?';
#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 str by a \0 */

#if _USE_LFN
 if (fno->lfname && fno->lfsize) {
  TCHAR *tp = fno->lfname;
  WCHAR w, *lfn;

  i = 0;
  if (dj->sect && dj->lfn_idx != 0xFFFF) {/* Get LFN if available */
   lfn = dj->lfn;
   while ((w = *lfn++) != 0) {   /* Get an LFN char */
#if !_LFN_UNICODE
    w = ff_convert(w, 0);   /* Unicode -> OEM conversion */
    if (!w) { i = 0; break; }  /* Could not convert, no LFN */
    if (_DF1S && w >= 0x100)  /* Put 1st byte if it is a DBC (always false on SBCS cfg) */
     tp[i++] = (TCHAR)(w >> 8);
#endif
    if (i >= fno->lfsize - 1) { i = 0; break; } /* Buffer overflow, no LFN */
    tp[i++] = (TCHAR)w;
   }
  }
  tp[i] = 0; /* Terminate the LFN str by a \0 */
 }
#endif
}
#endif /* _FS_MINIMIZE <= 1 */




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

static
FRESULT follow_path ( /* FR_OK(0): successful, !=0: error code */
 DIR *dj,   /* 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++; dj->sclust = 0;  /* Strip it and start from the root dir */
 } else {       /* No heading separator */
  dj->sclust = dj->fs->cdir; /* Start from the current dir */
 }
#else
 if (*path == '/' || *path == '\\') /* Strip heading separator if exist */
  path++;
 dj->sclust = 0;      /* Start from the root dir */
#endif

 if ((UINT)*path < ' ') {   /* Nul path means the start directory itself */
  res = dir_sdi(dj, 0);
  dj->dir = 0;
 } else {       /* Follow path */
  for (;;) {
   res = create_name(dj, &path); /* Get a segment */
   if (res != FR_OK) break;
   res = dir_find(dj);    /* Find it */
   ns = *(dj->fn+NS);
   if (res != FR_OK) {    /* Failed to find the object */
    if (res != FR_NO_FILE) break; /* Abort if any hard error occurred */
    /* Object not found */
    if (_FS_RPATH && (ns & NS_DOT)) { /* If dot entry is not exit */
     dj->sclust = 0; dj->dir = 0; /* It is the root dir */
     res = FR_OK;
     if (!(ns & NS_LAST)) continue;
    } else {       /* Could not find the object */
     if (!(ns & NS_LAST)) res = FR_NO_PATH;
    }
    break;
   }
   if (ns & NS_LAST) break;   /* Last segment match. Function completed. */
   dir = dj->dir;      /* There is next segment. Follow the sub directory */
   if (!(dir[DIR_Attr] & AM_DIR)) { /* Cannot follow because it is a file */
    res = FR_NO_PATH; break;
   }
   dj->sclust = ld_clust(dj->fs, dir);
  }
 }

 return res;
}




/*-----------------------------------------------------------------------*/
/* Load a sector and check if it is an FAT Volume Boot Record            */
/*-----------------------------------------------------------------------*/

static
BYTE check_fs ( /* 0:FAT-VBR, 1:Any BR but not FAT, 2:Not a BR, 3:Disk error */
 FATFS *fs, /* File system object */
 DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */
)
{
 if (disk_read(fs->drv, fs->win, sect, 1) != RES_OK) /* Load boot record */
  return 3;
 if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55)  /* Check 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)
  return 0;

 return 1;
}




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

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


 /* Get logical drive number from the path name */
 vol = p[0] - '0';     /* Is there a drive number? */
 if (vol <= 9 && p[1] == ':') {  /* Found a drive number, get and strip it */
  p += 2; *path = p;    /* Return pointer to the path name */
 } else {       /* No drive number is given */
#if _FS_RPATH
  vol = CurrVol;     /* Use current drive */
#else
  vol = 0;      /* Use drive 0 */
#endif
 }

 /* Check if the file system object is valid or not */
 *rfs = 0;
 if (vol >= _VOLUMES)     /* Is the drive number valid? */
  return FR_INVALID_DRIVE;
 fs = FatFs[vol];     /* Get corresponding file system object */
 if (!fs) return FR_NOT_ENABLED;  /* Is the file system object available? */

 ENTER_FF(fs);      /* Lock file system */

 *rfs = fs;       /* Return pointer to the corresponding 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 (has not been changed), */
   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 != 512      /* Get disk sector size (variable sector size cfg only) */
 if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &fs->ssize) != RES_OK)
  return FR_DISK_ERR;
#endif
 /* Search FAT partition on the drive. Supports only generic partitions, FDISK and SFD. */
 fmt = check_fs(fs, bsect = 0);  /* Load sector 0 and check if it is an FAT-VBR (in SFD) */
 if (LD2PT(vol) && !fmt) fmt = 1; /* Force non-SFD if the volume is forced partition */
 if (fmt == 1) {      /* Not an FAT-VBR, the physical drive can be partitioned */
  /* Check the partition listed in the partition table */
  pi = LD2PT(vol);
  if (pi) pi--;
  tbl = &fs->win[MBR_Table + pi * SZ_PTE];/* Partition table */
  if (tbl[4]) {      /* Is the partition existing? */
   bsect = LD_DWORD(&tbl[8]);  /* Partition offset in LBA */
   fmt = check_fs(fs, bsect);  /* Check the partition */
  }
 }
 if (fmt == 3) return FR_DISK_ERR;
 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 = b = fs->win[BPB_NumFATs];    /* Number of FAT copies */
 if (b != 1 && b != 2) return FR_NO_FILESYSTEM;  /* (Must be 1 or 2) */
 fasize *= b;          /* Number of sectors for FAT area */

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

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

 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;     /* (BPB_RsvdSecCnt 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->database = bsect + sysect;      /* Data start sector */
 fs->fatbase = bsect + nrsv;       /* FAT 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;      /* (Required 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) ?     /* (Required 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 required) */
  return FR_NO_FILESYSTEM;

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

 /* Get fsinfo if available */
 if (fmt == FS_FAT32) {
   fs->fsi_flag = 0;
  fs->fsi_sector = bsect + LD_WORD(fs->win+BPB_FSInfo);
  if (disk_read(fs->drv, fs->win, fs->fsi_sector, 1) == RES_OK &&
   LD_WORD(fs->win+BS_55AA) == 0xAA55 &&
   LD_DWORD(fs->win+FSI_LeadSig) == 0x41615252 &&
   LD_DWORD(fs->win+FSI_StrucSig) == 0x61417272) {
    fs->last_clust = LD_DWORD(fs->win+FSI_Nxt_Free);
    fs->free_clust = LD_DWORD(fs->win+FSI_Free_Count);
  }
 }
#endif
 fs->fs_type = fmt;  /* FAT sub-type */
 fs->id = ++Fsid;  /* File system mount ID */
 fs->winsect = 0;  /* Invalidate sector cache */
 fs->wflag = 0;
#if _FS_RPATH
 fs->cdir = 0;   /* Current directory (root dir) */
#endif
#if _FS_LOCK    /* Clear file lock semaphores */
 clear_lock(fs);
#endif

 return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Check if the file/dir 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 = (FIL*)obj; /* Assuming offset of fs and id in the FIL/DIR is identical */
 if (!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 (
 BYTE vol,  /* Logical drive number to be mounted/unmounted */
 FATFS *fs  /* Pointer to new file system object (NULL for unmount)*/
)
{
 FATFS *rfs;


 if (vol >= _VOLUMES)  /* Check if the drive number is valid */
  return FR_INVALID_DRIVE;
 rfs = FatFs[vol];   /* Get current fs object */

 if (rfs) {
#if _FS_LOCK
  clear_lock(rfs);
#endif
#if _FS_REENTRANT    /* Discard sync object of the current volume */
  if (!ff_del_syncobj(rfs->sobj)) return FR_INT_ERR;
#endif
  rfs->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(vol, &fs->sobj)) return FR_INT_ERR;
#endif
 }
 FatFs[vol] = fs;   /* Register new fs object */

 return FR_OK;
}




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

#if !_FS_READONLY
 mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
 res = chk_mounted(&path, &dj.fs, (BYTE)(mode & ~FA_READ));
#else
 mode &= FA_READ;
 res = chk_mounted(&path, &dj.fs, 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) /* Current dir 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 dir 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->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; fp->id = dj.fs->id; /* Validate file object */
  }
 }

 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 = buff;


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

 res = validate(fp);       /* Check validity */
 if (res != FR_OK) LEAVE_FF(fp->fs, res);
 if (fp->flag & FA__ERROR)     /* Aborted file? */
  LEAVE_FF(fp->fs, FR_INT_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, (BYTE)cc) != RES_OK)
     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) != RES_OK)
      ABORT(fp->fs, FR_DISK_ERR);
     fp->flag &= ~FA__DIRTY;
    }
#endif
    if (disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK) /* 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 = 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->flag & FA__ERROR)    /* Aborted file? */
  LEAVE_FF(fp->fs, FR_INT_ERR);
 if (!(fp->flag & FA_WRITE))    /* Check access mode */
  LEAVE_FF(fp->fs, FR_DENIED);
 if ((DWORD)(fp->fsize + btw) < fp->fsize) 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, */
      fp->sclust = 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 _FS_TINY
   if (fp->fs->winsect == fp->dsect && move_window(fp->fs, 0)) /* 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) != RES_OK)
     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, (BYTE)cc) != RES_OK)
     ABORT(fp->fs, FR_DISK_ERR);
#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
    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 (move_window(fp->fs, 0)) 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) != RES_OK)
      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 Object                                           */
/*-----------------------------------------------------------------------*/

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


 res = validate(fp);     /* Check validity of the object */
 if (res == FR_OK) {
  if (fp->flag & FA__WRITTEN) { /* Has the file been written? */
#if !_FS_TINY /* Write-back dirty buffer */
   if (fp->flag & FA__DIRTY) {
    if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
     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 */
    tim = get_fattime();      /* Update updated time */
    ST_DWORD(dir+DIR_WrtTime, tim);
    ST_WORD(dir+DIR_LstAccDate, 0);
    fp->flag &= ~FA__WRITTEN;
    fp->fs->wflag = 1;
    res = sync(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 = validate(fp);
 {
#if _FS_REENTRANT
  FATFS *fs = fp->fs;
#endif
  if (res == FR_OK) fp->fs = 0; /* Discard file object */
  LEAVE_FF(fs, res);
 }
#else
 res = f_sync(fp);  /* Flush cached data */
#if _FS_LOCK
 if (res == FR_OK) {  /* Decrement open counter */
#if _FS_REENTRANT
  FATFS *fs = fp->fs;;
  res = validate(fp);
  if (res == FR_OK) {
   res = dec_lock(fp->lockid); 
   unlock_fs(fs, FR_OK);
  }
#else
  res = dec_lock(fp->lockid);
#endif
 }
#endif
 if (res == FR_OK) fp->fs = 0; /* Discard file object */
 return res;
#endif
}




/*-----------------------------------------------------------------------*/
/* Current Drive/Directory Handlings                                     */
/*-----------------------------------------------------------------------*/

#if _FS_RPATH >= 1

FRESULT f_chdrive (
 BYTE drv  /* Drive number */
)
{
 if (drv >= _VOLUMES) return FR_INVALID_DRIVE;

 CurrVol = drv;

 return FR_OK;
}



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


 res = chk_mounted(&path, &dj.fs, 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 *path, /* Pointer to the directory path */
 UINT sz_path /* Size of path */
)
{
 FRESULT res;
 DIR dj;
 UINT i, n;
 DWORD ccl;
 TCHAR *tp;
 FILINFO fno;
 DEF_NAMEBUF;


 *path = 0;
 res = chk_mounted((const TCHAR**)&path, &dj.fs, 0); /* Get current volume */
 if (res == FR_OK) {
  INIT_BUF(dj);
  i = sz_path;  /* Bottom of buffer (dir stack base) */
  dj.sclust = dj.fs->cdir;   /* Start to follow upper dir from current dir */
  while ((ccl = dj.sclust) != 0) { /* Repeat while current dir is a sub-dir */
   res = dir_sdi(&dj, 1);   /* Get parent dir */
   if (res != FR_OK) break;
   res = dir_read(&dj);
   if (res != FR_OK) break;
   dj.sclust = ld_clust(dj.fs, dj.dir); /* Goto parent dir */
   res = dir_sdi(&dj, 0);
   if (res != FR_OK) break;
   do {       /* Find the entry links to the child dir */
    res = dir_read(&dj);
    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 = path;
   fno.lfsize = i;
#endif
   get_fileinfo(&dj, &fno);  /* Get the dir name and push it to the buffer */
   tp = fno.fname;
   if (_USE_LFN && *path) tp = path;
   for (n = 0; tp[n]; n++) ;
   if (i < n + 3) {
    res = FR_NOT_ENOUGH_CORE; break;
   }
   while (n) path[--i] = tp[--n];
   path[--i] = '/';
  }
  tp = path;
  if (res == FR_OK) {
   *tp++ = '0' + CurrVol;   /* Put drive number */
   *tp++ = ':';
   if (i == sz_path) {    /* Root-dir */
    *tp++ = '/';
   } else {      /* Sub-dir */
    do  /* Add stacked path str */
     *tp++ = path[i++];
    while (i < sz_path);
   }
  }
  *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->flag & FA__ERROR)   /* Check abort flag */
  LEAVE_FF(fp->fs, FR_INT_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) != RES_OK)
       ABORT(fp->fs, FR_DISK_ERR);
      fp->flag &= ~FA__DIRTY;
     }
#endif
     if (disk_read(fp->fs->drv, fp->buf, dsc, 1) != RES_OK) /* 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) != RES_OK)
     ABORT(fp->fs, FR_DISK_ERR);
    fp->flag &= ~FA__DIRTY;
   }
#endif
   if (disk_read(fp->fs->drv, fp->buf, nsect, 1) != RES_OK) /* 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 *dj,   /* Pointer to directory object to create */
 const TCHAR *path /* Pointer to the directory path */
)
{
 FRESULT res;
 FATFS *fs;
 DEF_NAMEBUF;


 if (!dj) return FR_INVALID_OBJECT;

 res = chk_mounted(&path, &dj->fs, 0);
 fs = dj->fs;
 if (res == FR_OK) {
  INIT_BUF(*dj);
  res = follow_path(dj, path);   /* Follow the path to the directory */
  FREE_BUF();
  if (res == FR_OK) {      /* Follow completed */
   if (dj->dir) {      /* It is not the root dir */
    if (dj->dir[DIR_Attr] & AM_DIR) { /* The object is a directory */
     dj->sclust = ld_clust(fs, dj->dir);
    } else {      /* The object is not a directory */
     res = FR_NO_PATH;
    }
   }
   if (res == FR_OK) {
    dj->id = fs->id;
    res = dir_sdi(dj, 0);   /* Rewind dir */
   }
  }
  if (res == FR_NO_FILE) res = FR_NO_PATH;
  if (res != FR_OK) dj->fs = 0;   /* Invalidate the dir object if function faild */
 } else {
  dj->fs = 0;
 }

 LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entry in Sequence                                      */
/*-----------------------------------------------------------------------*/

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


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

 LEAVE_FF(dj->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;


 res = chk_mounted(&path, &dj.fs, 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 */
    get_fileinfo(&dj, fno);
   else   /* It is root dir */
    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, /* Pointer to the logical drive number (root dir) */
 DWORD *nclst,  /* Pointer to the variable to return number of free clusters */
 FATFS **fatfs  /* Pointer to pointer to corresponding file system object to return */
)
{
 FRESULT res;
 FATFS *fs;
 DWORD n, clst, sect, stat;
 UINT i;
 BYTE fat, *p;


 /* Get drive number */
 res = chk_mounted(&path, fatfs, 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;
   if (fat == FS_FAT32) 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;


 if (!fp) return FR_INVALID_OBJECT;

 res = validate(fp);      /* Check validity of the object */
 if (res == FR_OK) {
  if (fp->flag & FA__ERROR) {   /* Check abort flag */
   res = FR_INT_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 (res != FR_OK) fp->flag |= FA__ERROR;
 }

 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;


 res = chk_mounted(&path, &dj.fs, 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-dir is empty or not */
     sdj.sclust = dclst;
     res = dir_sdi(&sdj, 2);  /* Exclude dot entries */
     if (res == FR_OK) {
      res = dir_read(&sdj);
      if (res == FR_OK  /* Not empty dir */
#if _FS_RPATH
      || dclst == dj.fs->cdir /* Current dir */
#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(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, tim = get_fattime();
 DEF_NAMEBUF;


 res = chk_mounted(&path, &dj.fs, 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 = move_window(dj.fs, 0);
   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, ' ', 8+3); /* Create "." entry */
    dir[DIR_Name] = '.';
    dir[DIR_Attr] = AM_DIR;
    ST_DWORD(dir+DIR_WrtTime, tim);
    st_clust(dir, dcl);
    mem_cpy(dir+SZ_DIR, dir, SZ_DIR);  /* Create ".." entry */
    dir[33] = '.'; 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 = move_window(dj.fs, 0);
     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, tim);  /* Created time */
    st_clust(dir, dcl);     /* Table start cluster */
    dj.fs->wflag = 1;
    res = sync(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;


 res = chk_mounted(&path, &dj.fs, 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(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;


 res = chk_mounted(&path, &dj.fs, 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(dj.fs);
   }
  }
 }

 LEAVE_FF(dj.fs, res);
}




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

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


 res = chk_mounted(&path_old, &djo.fs, 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 for name */
    mem_cpy(&djn, &djo, sizeof (DIR));  /* Check new object */
    res = follow_path(&djn, path_new);
    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 an interruption or error can cause cross-link */
     res = dir_register(&djn);   /* Register the new entry */
     if (res == FR_OK) {
      dir = djn.dir;     /* Copy object information except for 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(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 */



/*-----------------------------------------------------------------------*/
/* 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 btr,      /* 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 */

 if (!fp) return FR_INVALID_OBJECT;

 res = validate(fp);        /* Check validity of the object */
 if (res != FR_OK) LEAVE_FF(fp->fs, res);
 if (fp->flag & FA__ERROR)      /* Check error flag */
  LEAVE_FF(fp->fs, FR_INT_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 && (*func)(0, 0);     /* Repeat until all data transferred or stream becomes busy */
  fp->fptr += rcnt, *bf += rcnt, btr -= 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 > btr) rcnt = btr;
  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 dir entries for FAT12/16 */
#define N_FATS  1  /* Number of FAT copies (1 or 2) */


FRESULT f_mkfs (
 BYTE drv,  /* Logical drive number */
 BYTE sfd,  /* Partitioning rule 0:FDISK, 1:SFD */
 UINT au   /* Allocation unit size [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};
 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 */
 if (drv >= _VOLUMES) return FR_INVALID_DRIVE;
 if (sfd > 1) return FR_INVALID_PARAMETER;
 if (au & (au - 1)) return FR_INVALID_PARAMETER;
 fs = FatFs[drv];
 if (!fs) return FR_NOT_ENABLED;
 fs->fs_type = 0;
 pdrv = LD2PD(drv); /* Physical drive */
 part = LD2PT(drv); /* 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 != 512     /* Get disk sector size */
 if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_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) != RES_OK) 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;

 switch (fmt) { /* Determine system ID for partition table */
 case FS_FAT12: sys = 0x01; break;
 case FS_FAT16: sys = (n_vol < 0x10000) ? 0x04 : 0x06; break;
 default:   sys = 0x0C;
 }

 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) != RES_OK) 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) != RES_OK) /* Write it to the MBR sector */
    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 rootdir 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) != RES_OK) /* 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 dir */
  }
  if (disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
   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) != RES_OK)
    return FR_DISK_ERR;
  }
 }

 /* Initialize root directory */
 i = (fmt == FS_FAT32) ? au : n_dir;
 do {
  if (disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
   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 == 2
/*-----------------------------------------------------------------------*/
/* 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] <= 100) ? (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 == 2 */
#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* fil  /* Pointer to the file object */
)
{
 int n = 0;
 TCHAR c, *p = buff;
 BYTE s[2];
 UINT rc;


 while (n < len - 1) {   /* Read bytes until buffer gets filled */
  f_read(fil, s, 1, &rc);
  if (rc != 1) break;   /* Break on EOF or error */
  c = s[0];
#if _LFN_UNICODE     /* Read a character in UTF-8 encoding */
  if (c >= 0x80) {
   if (c < 0xC0) continue; /* Skip stray trailer */
   if (c < 0xE0) {   /* Two-byte sequence */
    f_read(fil, 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(fil, 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 = '?';
    }
   }
  }
#endif
#if _USE_STRFUNC >= 2
  if (c == '\r') continue; /* Strip '\r' */
#endif
  *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                                           */
/*-----------------------------------------------------------------------*/
int f_putc (
 TCHAR c, /* A character to be output */
 FIL* fil /* Pointer to the file object */
)
{
 UINT bw, btw;
 BYTE s[3];


#if _USE_STRFUNC >= 2
 if (c == '\n') f_putc ('\r', fil); /* LF -> CRLF conversion */
#endif

#if _LFN_UNICODE /* Write the character in UTF-8 encoding */
 if (c < 0x80) {   /* 7-bit */
  s[0] = (BYTE)c;
  btw = 1;
 } else {
  if (c < 0x800) { /* 11-bit */
   s[0] = (BYTE)(0xC0 | (c >> 6));
   s[1] = (BYTE)(0x80 | (c & 0x3F));
   btw = 2;
  } else {   /* 16-bit */
   s[0] = (BYTE)(0xE0 | (c >> 12));
   s[1] = (BYTE)(0x80 | ((c >> 6) & 0x3F));
   s[2] = (BYTE)(0x80 | (c & 0x3F));
   btw = 3;
  }
 }
#else    /* Write the character without conversion */
 s[0] = (BYTE)c;
 btw = 1;
#endif
 f_write(fil, s, btw, &bw);  /* Write the char to the file */
 return (bw == btw) ? 1 : EOF; /* Return the result */
}




/*-----------------------------------------------------------------------*/
/* Put a string to the file                                              */
/*-----------------------------------------------------------------------*/
int f_puts (
 const TCHAR* str, /* Pointer to the string to be output */
 FIL* fil   /* Pointer to the file object */
)
{
 int n;


 for (n = 0; *str; str++, n++) {
  if (f_putc(*str, fil) == EOF) return EOF;
 }
 return n;
}




/*-----------------------------------------------------------------------*/
/* Put a formatted string to the file                                    */
/*-----------------------------------------------------------------------*/
int f_printf (
 FIL* fil,   /* Pointer to the file object */
 const TCHAR* str, /* Pointer to the format string */
 ...     /* Optional arguments... */
)
{
 va_list arp;
 BYTE f, r;
 UINT i, j, w;
 ULONG v;
 TCHAR c, d, s[16], *p;
 int res, chc, cc;


 va_start(arp, str);

 for (cc = res = 0; cc != EOF; res += cc) {
  c = *str++;
  if (c == 0) break;   /* End of string */
  if (c != '%') {    /* Non escape character */
   cc = f_putc(c, fil);
   if (cc != EOF) cc = 1;
   continue;
  }
  w = f = 0;
  c = *str++;
  if (c == '0') {    /* Flag: '0' padding */
   f = 1; c = *str++;
  } else {
   if (c == '-') {   /* Flag: left justified */
    f = 2; c = *str++;
   }
  }
  while (IsDigit(c)) {  /* Precision */
   w = w * 10 + c - '0';
   c = *str++;
  }
  if (c == 'l' || c == 'L') { /* Prefix: Size is long int */
   f |= 4; c = *str++;
  }
  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++) ;
   chc = 0;
   if (!(f & 2)) {
    while (j++ < w) chc += (cc = f_putc(' ', fil));
   }
   chc += (cc = f_puts(p, fil));
   while (j++ < w) chc += (cc = f_putc(' ', fil));
   if (cc != EOF) cc = chc;
   continue;
  case 'C' :     /* Character */
   cc = f_putc((TCHAR)va_arg(arp, int), fil); 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) */
   cc = f_putc(c, fil); continue;
  }

  /* Get an argument and put it in numeral */
  v = (f & 4) ? (ULONG)va_arg(arp, long) : ((d == 'D') ? (ULONG)(long)va_arg(arp, int) : (ULONG)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' : ' ';
  res = 0;
  while (!(f & 2) && j++ < w) res += (cc = f_putc(d, fil));
  do res += (cc = f_putc(s[--i], fil)); while(i);
  while (j++ < w) res += (cc = f_putc(' ', fil));
  if (cc != EOF) cc = res;
 }

 va_end(arp);
 return (cc == EOF) ? cc : res;
}

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