CircuitPython

Source code browser

Note: This site will be taken down by the end of the year

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/* This file is part of ooFatFs, a customised version of FatFs
 * See https://github.com/micropython/oofatfs for details
 */

/*----------------------------------------------------------------------------/
/  FatFs - Generic FAT file system module  R0.12b                             /
/-----------------------------------------------------------------------------/
/
/ Copyright (C) 2016, ChaN, all right reserved.
/
/ FatFs module is an open source software. Redistribution and use of FatFs in
/ source and binary forms, with or without modification, are permitted provided
/ that the following condition is met:

/ 1. Redistributions of source code must retain the above copyright notice,
/    this condition and the following disclaimer.
/
/ This software is provided by the copyright holder and contributors "AS IS"
/ and any warranties related to this software are DISCLAIMED.
/ The copyright owner or contributors be NOT LIABLE for any damages caused
/ by use of this software.
/----------------------------------------------------------------------------*/


#include <string.h>

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

// DIR has been renamed FF_DIR in the public API so it doesn't clash with POSIX
#define DIR FF_DIR

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

   Module Private Definitions

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

#if _FATFS != 68020 /* Revision ID */
#error Wrong include file (ff.h).
#endif


#define ABORT(fs, res)      { fp->err = (BYTE)(res); LEAVE_FF(fs, res); }


/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration
#endif
#define ENTER_FF(fs)        { if (!lock_fs(fs)) return FR_TIMEOUT; }
#define LEAVE_FF(fs, res)   { unlock_fs(fs, res); return res; }
#else
#define ENTER_FF(fs)
#define LEAVE_FF(fs, res)   return res
#endif



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


/* Timestamp */
#if _FS_NORTC == 1
#if _NORTC_YEAR < 1980 || _NORTC_YEAR > 2107 || _NORTC_MON < 1 || _NORTC_MON > 12 || _NORTC_MDAY < 1 || _NORTC_MDAY > 31
#error Invalid _FS_NORTC settings
#endif
#define GET_FATTIME()   ((DWORD)(_NORTC_YEAR - 1980) << 25 | (DWORD)_NORTC_MON << 21 | (DWORD)_NORTC_MDAY << 16)
#else
#define GET_FATTIME()   get_fattime()
#endif


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



/* DBCS code ranges and SBCS upper conversion tables */

#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. */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x45,0x41,0x8E,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,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 == 720 /* Arabic */
#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 == 737 /* Greek */
#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,0xEF,0xF5,0xF0,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 771 /* KBL */
#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,0xDC,0xDE,0xDE, \
                0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 775 /* Baltic */
#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 /* Latin 1 */
#define _DF1S   0
#define _EXCVT {0x43,0x55,0x45,0x41,0x41,0x41,0x41,0x43,0x45,0x45,0x45,0x49,0x49,0x49,0x41,0x41, \
                0x45,0x92,0x92,0x4F,0x4F,0x4F,0x55,0x55,0x59,0x4F,0x55,0x4F,0x9C,0x4F,0x9E,0x9F, \
                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                0xB0,0xB1,0xB2,0xB3,0xB4,0x41,0x41,0x41,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0x41,0x41,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                0xD1,0xD1,0x45,0x45,0x45,0x49,0x49,0x49,0x49,0xD9,0xDA,0xDB,0xDC,0xDD,0x49,0xDF, \
                0x4F,0xE1,0x4F,0x4F,0x4F,0x4F,0xE6,0xE8,0xE8,0x55,0x55,0x55,0x59,0x59,0xEE,0xEF, \
                0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 852 /* Latin 2 */
#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,0xAC, \
                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 */
#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 */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x49,0x8E,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,0xAD,0xAE,0xAF, \
                0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                0xD0,0xD1,0xD2,0xD3,0xD4,0x49,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0xED,0xEE,0xEF, \
                0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 860 /* Portuguese */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x8F,0x8E,0x91,0x86,0x80,0x89,0x89,0x92,0x8B,0x8C,0x98,0x8E,0x8F, \
                0x90,0x91,0x92,0x8C,0x99,0xA9,0x96,0x9D,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0x86,0x8B,0x9F,0x96,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,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 == 861 /* Icelandic */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x8B,0x8B,0x8D,0x8E,0x8F, \
                0x90,0x92,0x92,0x4F,0x99,0x8D,0x55,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                0xA4,0xA5,0xA6,0xA7,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,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 == 862 /* Hebrew */
#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,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 == 863 /* Canadian-French */
#define _DF1S   0
#define _EXCVT {0x43,0x55,0x45,0x41,0x41,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x41,0x8F, \
                0x45,0x45,0x45,0x4F,0x45,0x49,0x55,0x55,0x98,0x4F,0x55,0x9B,0x9C,0x55,0x55,0x9F, \
                0xA0,0xA1,0x4F,0x55,0xA4,0xA5,0xA6,0xA7,0x49,0xA9,0xAA,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 == 864 /* Arabic */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x45,0x41,0x8E,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,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 == 865 /* Nordic */
#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,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 == 866 /* Russian */
#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, \
                0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 869 /* Greek 2 */
#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,0x86,0x9C,0x8D,0x8F,0x90, \
                0x91,0x90,0x92,0x95,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,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, \
                0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xA4,0xA5,0xA6,0xD9,0xDA,0xDB,0xDC,0xA7,0xA8,0xDF, \
                0xA9,0xAA,0xAC,0xAD,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xCF,0xCF,0xD0,0xEF, \
                0xF0,0xF1,0xD1,0xD2,0xD3,0xF5,0xD4,0xF7,0xF8,0xF9,0xD5,0x96,0x95,0x98,0xFE,0xFF}

#elif _CODE_PAGE == 1   /* ASCII (for only non-LFN cfg) */
#if _USE_LFN != 0
#error Cannot enable LFN 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 != 0  /* 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 */


/* File attribute bits (internal use) */
#define AM_VOL      0x08    /* Volume label */
#define AM_LFN      0x0F    /* LFN entry */
#define AM_MASK     0x3F    /* Mask of defined bits */


/* File access control and file status flags (internal use) */
#define FA_SEEKEND  0x20    /* Seek to end of the file on file open */
#define FA_MODIFIED 0x40    /* File has been modified */
#define FA_DIRTY    0x80    /* FIL.buf[] needs to be written-back */


/* Name status flags */
#define NSFLAG      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 */
#define NS_NOLFN    0x40    /* Do not find LFN */
#define NS_NONAME   0x80    /* Not followed */


/* Limits and boundaries (differ from specs but correct for real DOS/Windows) */
#define MAX_FAT12   0xFF5           /* Maximum number of FAT12 clusters */
#define MAX_FAT16   0xFFF5          /* Maximum number of FAT16 clusters */
#define MAX_FAT32   0xFFFFFF5       /* Maximum number of FAT32 clusters */
#define MAX_EXFAT   0x7FFFFFFD      /* Maximum number of exFAT clusters (limited by implementation) */
#define MAX_DIR     0x200000        /* Maximum size of FAT directory */
#define MAX_DIR_EX  0x10000000      /* Maximum size of exFAT directory */


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

#define BS_JmpBoot          0       /* x86 jump instruction (3-byte) */
#define BS_OEMName          3       /* OEM name (8-byte) */
#define BPB_BytsPerSec      11      /* Sector size [byte] (WORD) */
#define BPB_SecPerClus      13      /* Cluster size [sector] (BYTE) */
#define BPB_RsvdSecCnt      14      /* Size of reserved area [sector] (WORD) */
#define BPB_NumFATs         16      /* Number of FATs (BYTE) */
#define BPB_RootEntCnt      17      /* Size of root directory area for FAT12/16 [entry] (WORD) */
#define BPB_TotSec16        19      /* Volume size (16-bit) [sector] (WORD) */
#define BPB_Media           21      /* Media descriptor byte (BYTE) */
#define BPB_FATSz16         22      /* FAT size (16-bit) [sector] (WORD) */
#define BPB_SecPerTrk       24      /* Track size for int13h [sector] (WORD) */
#define BPB_NumHeads        26      /* Number of heads for int13h (WORD) */
#define BPB_HiddSec         28      /* Volume offset from top of the drive (DWORD) */
#define BPB_TotSec32        32      /* Volume size (32-bit) [sector] (DWORD) */
#define BS_DrvNum           36      /* Physical drive number for int13h (BYTE) */
#define BS_NTres            37      /* Error flag (BYTE) */
#define BS_BootSig          38      /* Extended boot signature (BYTE) */
#define BS_VolID            39      /* Volume serial number (DWORD) */
#define BS_VolLab           43      /* Volume label string (8-byte) */
#define BS_FilSysType       54      /* File system type string (8-byte) */
#define BS_BootCode         62      /* Boot code (448-byte) */
#define BS_55AA             510     /* Signature word (WORD) */

#define BPB_FATSz32         36      /* FAT32: FAT size [sector] (DWORD) */
#define BPB_ExtFlags32      40      /* FAT32: Extended flags (WORD) */
#define BPB_FSVer32         42      /* FAT32: File system version (WORD) */
#define BPB_RootClus32      44      /* FAT32: Root directory cluster (DWORD) */
#define BPB_FSInfo32        48      /* FAT32: Offset of FSINFO sector (WORD) */
#define BPB_BkBootSec32     50      /* FAT32: Offset of backup boot sector (WORD) */
#define BS_DrvNum32         64      /* FAT32: Physical drive number for int13h (BYTE) */
#define BS_NTres32          65      /* FAT32: Error flag (BYTE) */
#define BS_BootSig32        66      /* FAT32: Extended boot signature (BYTE) */
#define BS_VolID32          67      /* FAT32: Volume serial number (DWORD) */
#define BS_VolLab32         71      /* FAT32: Volume label string (8-byte) */
#define BS_FilSysType32     82      /* FAT32: File system type string (8-byte) */
#define BS_BootCode32       90      /* FAT32: Boot code (420-byte) */

#define BPB_ZeroedEx        11      /* exFAT: MBZ field (53-byte) */
#define BPB_VolOfsEx        64      /* exFAT: Volume offset from top of the drive [sector] (QWORD) */
#define BPB_TotSecEx        72      /* exFAT: Volume size [sector] (QWORD) */
#define BPB_FatOfsEx        80      /* exFAT: FAT offset from top of the volume [sector] (DWORD) */
#define BPB_FatSzEx         84      /* exFAT: FAT size [sector] (DWORD) */
#define BPB_DataOfsEx       88      /* exFAT: Data offset from top of the volume [sector] (DWORD) */
#define BPB_NumClusEx       92      /* exFAT: Number of clusters (DWORD) */
#define BPB_RootClusEx      96      /* exFAT: Root directory cluster (DWORD) */
#define BPB_VolIDEx         100     /* exFAT: Volume serial number (DWORD) */
#define BPB_FSVerEx         104     /* exFAT: File system version (WORD) */
#define BPB_VolFlagEx       106     /* exFAT: Volume flags (BYTE) */
#define BPB_ActFatEx        107     /* exFAT: Active FAT flags (BYTE) */
#define BPB_BytsPerSecEx    108     /* exFAT: Log2 of sector size in byte (BYTE) */
#define BPB_SecPerClusEx    109     /* exFAT: Log2 of cluster size in sector (BYTE) */
#define BPB_NumFATsEx       110     /* exFAT: Number of FATs (BYTE) */
#define BPB_DrvNumEx        111     /* exFAT: Physical drive number for int13h (BYTE) */
#define BPB_PercInUseEx     112     /* exFAT: Percent in use (BYTE) */
#define BPB_RsvdEx          113     /* exFAT: Reserved (7-byte) */
#define BS_BootCodeEx       120     /* exFAT: Boot code (390-byte) */

#define FSI_LeadSig         0       /* FAT32 FSI: Leading signature (DWORD) */
#define FSI_StrucSig        484     /* FAT32 FSI: Structure signature (DWORD) */
#define FSI_Free_Count      488     /* FAT32 FSI: Number of free clusters (DWORD) */
#define FSI_Nxt_Free        492     /* FAT32 FSI: Last allocated cluster (DWORD) */

#define MBR_Table           446     /* MBR: Offset of partition table in the MBR */
#define SZ_PTE              16      /* MBR: Size of a partition table entry */
#define PTE_Boot            0       /* MBR PTE: Boot indicator */
#define PTE_StHead          1       /* MBR PTE: Start head */
#define PTE_StSec           2       /* MBR PTE: Start sector */
#define PTE_StCyl           3       /* MBR PTE: Start cylinder */
#define PTE_System          4       /* MBR PTE: System ID */
#define PTE_EdHead          5       /* MBR PTE: End head */
#define PTE_EdSec           6       /* MBR PTE: End sector */
#define PTE_EdCyl           7       /* MBR PTE: End cylinder */
#define PTE_StLba           8       /* MBR PTE: Start in LBA */
#define PTE_SizLba          12      /* MBR PTE: Size in LBA */

#define DIR_Name            0       /* Short file name (11-byte) */
#define DIR_Attr            11      /* Attribute (BYTE) */
#define DIR_NTres           12      /* Lower case flag (BYTE) */
#define DIR_CrtTime10       13      /* Created time sub-second (BYTE) */
#define DIR_CrtTime         14      /* Created time (DWORD) */
#define DIR_LstAccDate      18      /* Last accessed date (WORD) */
#define DIR_FstClusHI       20      /* Higher 16-bit of first cluster (WORD) */
#define DIR_ModTime         22      /* Modified time (DWORD) */
#define DIR_FstClusLO       26      /* Lower 16-bit of first cluster (WORD) */
#define DIR_FileSize        28      /* File size (DWORD) */
#define LDIR_Ord            0       /* LFN entry order and LLE flag (BYTE) */
#define LDIR_Attr           11      /* LFN attribute (BYTE) */
#define LDIR_Type           12      /* LFN type (BYTE) */
#define LDIR_Chksum         13      /* Checksum of the SFN entry (BYTE) */
#define LDIR_FstClusLO      26      /* Must be zero (WORD) */
#define XDIR_Type           0       /* Type of exFAT directory entry (BYTE) */
#define XDIR_NumLabel       1       /* Number of volume label characters (BYTE) */
#define XDIR_Label          2       /* Volume label (11-WORD) */
#define XDIR_CaseSum        4       /* Sum of case conversion table (DWORD) */
#define XDIR_NumSec         1       /* Number of secondary entries (BYTE) */
#define XDIR_SetSum         2       /* Sum of the set of directory entries (WORD) */
#define XDIR_Attr           4       /* File attribute (WORD) */
#define XDIR_CrtTime        8       /* Created time (DWORD) */
#define XDIR_ModTime        12      /* Modified time (DWORD) */
#define XDIR_AccTime        16      /* Last accessed time (DWORD) */
#define XDIR_CrtTime10      20      /* Created time subsecond (BYTE) */
#define XDIR_ModTime10      21      /* Modified time subsecond (BYTE) */
#define XDIR_CrtTZ          22      /* Created timezone (BYTE) */
#define XDIR_ModTZ          23      /* Modified timezone (BYTE) */
#define XDIR_AccTZ          24      /* Last accessed timezone (BYTE) */
#define XDIR_GenFlags       33      /* Gneral secondary flags (WORD) */
#define XDIR_NumName        35      /* Number of file name characters (BYTE) */
#define XDIR_NameHash       36      /* Hash of file name (WORD) */
#define XDIR_ValidFileSize  40      /* Valid file size (QWORD) */
#define XDIR_FstClus        52      /* First cluster of the file data (DWORD) */
#define XDIR_FileSize       56      /* File/Directory size (QWORD) */

#define SZDIRE              32      /* Size of a directory entry */
#define LLEF                0x40    /* Last long entry flag in LDIR_Ord */
#define DDEM                0xE5    /* Deleted directory entry mark set to DIR_Name[0] */
#define RDDEM               0x05    /* Replacement of the character collides with DDEM */





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

   Module Private Work Area

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

/* Remark: Variables here without initial value shall be guaranteed zero/null
/  at start-up. If not, either the linker or start-up routine being used is
/  not compliance with C standard. */

#if _VOLUMES < 1 || _VOLUMES > 9
#error Wrong _VOLUMES setting
#endif
static WORD Fsid;               /* File system mount ID */

#if _FS_LOCK != 0
static FILESEM Files[_FS_LOCK]; /* Open object lock semaphores */
#endif

#if _USE_LFN == 0           /* Non-LFN configuration */
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
#else
#if _MAX_LFN < 12 || _MAX_LFN > 255
#error Wrong _MAX_LFN setting
#endif

#if _USE_LFN == 1       /* LFN enabled with static working buffer */
#if _FS_EXFAT
static BYTE DirBuf[SZDIRE*19];  /* Directory entry block scratchpad buffer (19 entries in size) */
#endif
static WCHAR LfnBuf[_MAX_LFN+1];    /* LFN enabled with static working buffer */
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()

#elif _USE_LFN == 2     /* LFN enabled with dynamic working buffer on the stack */
#if _FS_EXFAT
#define DEF_NAMBUF      WCHAR lbuf[_MAX_LFN+1]; BYTE dbuf[SZDIRE*19];
#define INIT_NAMBUF(fs) { (fs)->lfnbuf = lbuf; (fs)->dirbuf = dbuf; }
#define FREE_NAMBUF()
#else
#define DEF_NAMBUF      WCHAR lbuf[_MAX_LFN+1];
#define INIT_NAMBUF(fs) { (fs)->lfnbuf = lbuf; }
#define FREE_NAMBUF()
#endif

#elif _USE_LFN == 3     /* LFN enabled with dynamic working buffer on the heap */
#if _FS_EXFAT
#define DEF_NAMBUF      WCHAR *lfn;
#define INIT_NAMBUF(fs) { lfn = ff_memalloc((_MAX_LFN+1)*2 + SZDIRE*19); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; (fs)->dirbuf = (BYTE*)(lfn+_MAX_LFN+1); }
#define FREE_NAMBUF()   ff_memfree(lfn)
#else
#define DEF_NAMBUF      WCHAR *lfn;
#define INIT_NAMBUF(fs) { lfn = ff_memalloc((_MAX_LFN+1)*2); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; }
#define FREE_NAMBUF()   ff_memfree(lfn)
#endif

#else
#error Wrong _USE_LFN setting
#endif
#endif

#ifdef _EXCVT
static const BYTE ExCvt[] = _EXCVT; /* Upper conversion table for SBCS extended characters */
#endif






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

   Module Private Functions

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


/*-----------------------------------------------------------------------*/
/* Load/Store multi-byte word in the FAT structure                       */
/*-----------------------------------------------------------------------*/

static
WORD ld_word (const BYTE* ptr)  /*   Load a 2-byte little-endian word */
{
    WORD rv;

    rv = ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}

static
DWORD ld_dword (const BYTE* ptr)    /* Load a 4-byte little-endian word */
{
    DWORD rv;

    rv = ptr[3];
    rv = rv << 8 | ptr[2];
    rv = rv << 8 | ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}

#if _FS_EXFAT
static
QWORD ld_qword (const BYTE* ptr)    /* Load an 8-byte little-endian word */
{
    QWORD rv;

    rv = ptr[7];
    rv = rv << 8 | ptr[6];
    rv = rv << 8 | ptr[5];
    rv = rv << 8 | ptr[4];
    rv = rv << 8 | ptr[3];
    rv = rv << 8 | ptr[2];
    rv = rv << 8 | ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}
#endif

#if !_FS_READONLY
static
void st_word (BYTE* ptr, WORD val)  /* Store a 2-byte word in little-endian */
{
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val;
}

static
void st_dword (BYTE* ptr, DWORD val)    /* Store a 4-byte word in little-endian */
{
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val;
}

#if _FS_EXFAT
static
void st_qword (BYTE* ptr, QWORD val)    /* Store an 8-byte word in little-endian */
{
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val; val >>= 8;
    *ptr++ = (BYTE)val;
}
#endif
#endif  /* !_FS_READONLY */



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

// These were originally provided by the FatFs library but we use externally
// provided versions from C stdlib to (hopefully) reduce code size and use
// more efficient versions.
#define mem_cpy memcpy
#define mem_set memset
#define mem_cmp memcmp

/* Check if chr is contained in the string */
static
int chk_chr (const char* str, int chr) {    /* NZ:contained, ZR:not contained */
    while (*str && *str != chr) str++;
    return *str;
}




#if _FS_REENTRANT
/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
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_TIMEOUT) {
        ff_rel_grant(fs->sobj);
    }
}

#endif



#if _FS_LOCK != 0
/*-----------------------------------------------------------------------*/
/* File lock control functions                                           */
/*-----------------------------------------------------------------------*/

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

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

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


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

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


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


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

    if (i == _FS_LOCK) {                /* Not opened. Register it as new. */
        for (i = 0; i < _FS_LOCK && Files[i].fs; i++) ;
        if (i == _FS_LOCK) return 0;    /* No free entry to register (int err) */
        Files[i].fs = dp->obj.fs;
        Files[i].clu = dp->obj.sclust;
        Files[i].ofs = dp->dptr;
        Files[i].ctr = 0;
    }

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

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

    return i + 1;
}


static
FRESULT dec_lock (  /* Decrement object open counter */
    UINT i          /* Semaphore index (1..) */
)
{
    WORD n;
    FRESULT res;


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


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

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

#endif  /* _FS_LOCK != 0 */



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


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


static
FRESULT move_window (   /* Returns FR_OK or FR_DISK_ERROR */
    FATFS* fs,          /* File system object */
    DWORD sector        /* Sector number to make appearance in the fs->win[] */
)
{
    FRESULT res = FR_OK;


    if (sector != fs->winsect) {    /* Window offset changed? */
#if !_FS_READONLY
        res = sync_window(fs);      /* Write-back changes */
#endif
        if (res == FR_OK) {         /* Fill sector window with new data */
            if (disk_read(fs->drv, fs->win, sector, 1) != RES_OK) {
                sector = 0xFFFFFFFF;    /* Invalidate window if data is not reliable */
                res = FR_DISK_ERR;
            }
            fs->winsect = sector;
        }
    }
    return res;
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Synchronize file system and strage device                             */
/*-----------------------------------------------------------------------*/

static
FRESULT sync_fs (   /* FR_OK:succeeded, !=0:error */
    FATFS* fs       /* File system object */
)
{
    FRESULT res;


    res = sync_window(fs);
    if (res == FR_OK) {
        /* Update FSInfo sector if needed */
        if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {
            /* Create FSInfo structure */
            mem_set(fs->win, 0, SS(fs));
            st_word(fs->win + BS_55AA, 0xAA55);
            st_dword(fs->win + FSI_LeadSig, 0x41615252);
            st_dword(fs->win + FSI_StrucSig, 0x61417272);
            st_dword(fs->win + FSI_Free_Count, fs->free_clst);
            st_dword(fs->win + FSI_Nxt_Free, fs->last_clst);
            /* Write it into the FSInfo sector */
            fs->winsect = fs->volbase + 1;
            disk_write(fs->drv, fs->win, fs->winsect, 1);
            fs->fsi_flag = 0;
        }
        /* Make sure that no pending write process in the physical drive */
        if (disk_ioctl(fs->drv, CTRL_SYNC, 0) != RES_OK) res = FR_DISK_ERR;
    }

    return res;
}

#endif



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

static
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                                */
/*-----------------------------------------------------------------------*/

static
DWORD get_fat ( /* 0xFFFFFFFF:Disk error, 1:Internal error, 2..0x7FFFFFFF:Cluster status */
    _FDID* obj, /* Corresponding object */
    DWORD clst  /* Cluster number to get the value */
)
{
    UINT wc, bc;
    DWORD val;
    FATFS *fs = obj->fs;


    if (clst < 2 || clst >= fs->n_fatent) { /* Check if in valid range */
        val = 1;    /* Internal error */

    } else {
        val = 0xFFFFFFFF;   /* Default value falls on disk error */

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

        case FS_FAT16 :
            if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))) != FR_OK) break;
            val = ld_word(fs->win + clst * 2 % SS(fs));
            break;

        case FS_FAT32 :
            if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
            val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x0FFFFFFF;
            break;
#if _FS_EXFAT
        case FS_EXFAT :
            if (obj->objsize) {
                DWORD cofs = clst - obj->sclust;    /* Offset from start cluster */
                DWORD clen = (DWORD)((obj->objsize - 1) / SS(fs)) / fs->csize;  /* Number of clusters - 1 */

                if (obj->stat == 2) {   /* Is there no valid chain on the FAT? */
                    if (cofs <= clen) {
                        val = (cofs == clen) ? 0x7FFFFFFF : clst + 1;   /* Generate the value */
                        break;
                    }
                }
                if (obj->stat == 3 && cofs < obj->n_cont) { /* Is it in the contiguous part? */
                    val = clst + 1;     /* Generate the value */
                    break;
                }
                if (obj->stat != 2) {   /* Get value from FAT if FAT chain is valid */
                    if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
                    val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x7FFFFFFF;
                    break;
                }
            }
            /* go next */
#endif
        default:
            val = 1;    /* Internal error */
        }
    }

    return val;
}




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

static
FRESULT put_fat (   /* FR_OK(0):succeeded, !=0:error */
    FATFS* fs,      /* Corresponding file system object */
    DWORD clst,     /* FAT index number (cluster number) to be changed */
    DWORD val       /* New value to be set to the entry */
)
{
    UINT bc;
    BYTE *p;
    FRESULT res = FR_INT_ERR;


    if (clst >= 2 && clst < fs->n_fatent) { /* Check if in valid range */
        switch (fs->fs_type) {
        case FS_FAT12 : /* Bitfield items */
            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;
            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));
            fs->wflag = 1;
            break;

        case FS_FAT16 : /* WORD aligned items */
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
            if (res != FR_OK) break;
            st_word(fs->win + clst * 2 % SS(fs), (WORD)val);
            fs->wflag = 1;
            break;

        case FS_FAT32 : /* DWORD aligned items */
#if _FS_EXFAT
        case FS_EXFAT :
#endif
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
            if (res != FR_OK) break;
            if (!_FS_EXFAT || fs->fs_type != FS_EXFAT) {
                val = (val & 0x0FFFFFFF) | (ld_dword(fs->win + clst * 4 % SS(fs)) & 0xF0000000);
            }
            st_dword(fs->win + clst * 4 % SS(fs), val);
            fs->wflag = 1;
            break;
        }
    }
    return res;
}

#endif /* !_FS_READONLY */




#if _FS_EXFAT && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* exFAT: Accessing FAT and Allocation Bitmap                            */
/*-----------------------------------------------------------------------*/

/*---------------------------------------------*/
/* exFAT: Find a contiguous free cluster block */
/*---------------------------------------------*/

static
DWORD find_bitmap ( /* 0:No free cluster, 2..:Free cluster found, 0xFFFFFFFF:Disk error */
    FATFS* fs,  /* File system object */
    DWORD clst, /* Cluster number to scan from */
    DWORD ncl   /* Number of contiguous clusters to find (1..) */
)
{
    BYTE bm, bv;
    UINT i;
    DWORD val, scl, ctr;


    clst -= 2;  /* The first bit in the bitmap corresponds to cluster #2 */
    if (clst >= fs->n_fatent - 2) clst = 0;
    scl = val = clst; ctr = 0;
    for (;;) {
        if (move_window(fs, fs->database + val / 8 / SS(fs)) != FR_OK) return 0xFFFFFFFF;   /* (assuming bitmap is located top of the cluster heap) */
        i = val / 8 % SS(fs); bm = 1 << (val % 8);
        do {
            do {
                bv = fs->win[i] & bm; bm <<= 1;     /* Get bit value */
                if (++val >= fs->n_fatent - 2) {    /* Next cluster (with wrap-around) */
                    val = 0; bm = 0; i = 4096;
                }
                if (!bv) {  /* Is it a free cluster? */
                    if (++ctr == ncl) return scl + 2;   /* Check run length */
                } else {
                    scl = val; ctr = 0;     /* Encountered a live cluster, restart to scan */
                }
                if (val == clst) return 0;  /* All cluster scanned? */
            } while (bm);
            bm = 1;
        } while (++i < SS(fs));
    }
}


/*------------------------------------*/
/* exFAT: Set/Clear a block of bitmap */
/*------------------------------------*/

static
FRESULT change_bitmap (
    FATFS* fs,  /* File system object */
    DWORD clst, /* Cluster number to change from */
    DWORD ncl,  /* Number of clusters to be changed */
    int bv      /* bit value to be set (0 or 1) */
)
{
    BYTE bm;
    UINT i;
    DWORD sect;


    clst -= 2;  /* The first bit corresponds to cluster #2 */
    sect = fs->database + clst / 8 / SS(fs);    /* Sector address (assuming bitmap is located top of the cluster heap) */
    i = clst / 8 % SS(fs);                      /* Byte offset in the sector */
    bm = 1 << (clst % 8);                       /* Bit mask in the byte */
    for (;;) {
        if (move_window(fs, sect++) != FR_OK) return FR_DISK_ERR;
        do {
            do {
                if (bv == (int)((fs->win[i] & bm) != 0)) return FR_INT_ERR; /* Is the bit expected value? */
                fs->win[i] ^= bm;   /* Flip the bit */
                fs->wflag = 1;
                if (--ncl == 0) return FR_OK;   /* All bits processed? */
            } while (bm <<= 1);     /* Next bit */
            bm = 1;
        } while (++i < SS(fs));     /* Next byte */
        i = 0;
    }
}


/*---------------------------------------------*/
/* Complement contiguous part of the FAT chain */
/*---------------------------------------------*/

static
FRESULT fill_fat_chain (
    _FDID* obj  /* Pointer to the corresponding object */
)
{
    FRESULT res;
    DWORD cl, n;

    if (obj->stat == 3) {   /* Has the object been changed 'fragmented'? */
        for (cl = obj->sclust, n = obj->n_cont; n; cl++, n--) { /* Create cluster chain on the FAT */
            res = put_fat(obj->fs, cl, cl + 1);
            if (res != FR_OK) return res;
        }
        obj->stat = 0;  /* Change status 'FAT chain is valid' */
    }
    return FR_OK;
}

#endif  /* _FS_EXFAT && !_FS_READONLY */



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/
static
FRESULT remove_chain (  /* FR_OK(0):succeeded, !=0:error */
    _FDID* obj,         /* Corresponding object */
    DWORD clst,         /* Cluster to remove a chain from */
    DWORD pclst         /* Previous cluster of clst (0:an entire chain) */
)
{
    FRESULT res = FR_OK;
    DWORD nxt;
    FATFS *fs = obj->fs;
#if _FS_EXFAT || _USE_TRIM
    DWORD scl = clst, ecl = clst;
#endif
#if _USE_TRIM
    DWORD rt[2];
#endif

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

    /* Mark the previous cluster 'EOC' on the FAT if it exists */
    if (pclst && (!_FS_EXFAT || fs->fs_type != FS_EXFAT || obj->stat != 2)) {
        res = put_fat(fs, pclst, 0xFFFFFFFF);
        if (res != FR_OK) return res;
    }

    /* Remove the chain */
    do {
        nxt = get_fat(obj, clst);           /* Get cluster status */
        if (nxt == 0) break;                /* Empty cluster? */
        if (nxt == 1) return FR_INT_ERR;    /* Internal error? */
        if (nxt == 0xFFFFFFFF) return FR_DISK_ERR;  /* Disk error? */
        if (!_FS_EXFAT || fs->fs_type != FS_EXFAT) {
            res = put_fat(fs, clst, 0);     /* Mark the cluster 'free' on the FAT */
            if (res != FR_OK) return res;
        }
        if (fs->free_clst < fs->n_fatent - 2) { /* Update FSINFO */
            fs->free_clst++;
            fs->fsi_flag |= 1;
        }
#if _FS_EXFAT || _USE_TRIM
        if (ecl + 1 == nxt) {   /* Is next cluster contiguous? */
            ecl = nxt;
        } else {                /* End of contiguous cluster block */
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                res = change_bitmap(fs, scl, ecl - scl + 1, 0); /* Mark the cluster block 'free' on the bitmap */
                if (res != FR_OK) return res;
            }
#endif
#if _USE_TRIM
            rt[0] = clust2sect(fs, scl);                    /* Start sector */
            rt[1] = clust2sect(fs, ecl) + fs->csize - 1;    /* End sector */
            disk_ioctl(fs->drv, CTRL_TRIM, rt);             /* Inform device the block can be erased */
#endif
            scl = ecl = nxt;
        }
#endif
        clst = nxt;                 /* Next cluster */
    } while (clst < fs->n_fatent);  /* Repeat while not the last link */

#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {
        if (pclst == 0) {   /* Does object have no chain? */
            obj->stat = 0;      /* Change the object status 'initial' */
        } else {
            if (obj->stat == 3 && pclst >= obj->sclust && pclst <= obj->sclust + obj->n_cont) { /* Did the chain got contiguous? */
                obj->stat = 2;  /* Change the object status 'contiguous' */
            }
        }
    }
#endif
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* FAT handling - Stretch a chain or Create a new chain                  */
/*-----------------------------------------------------------------------*/
static
DWORD create_chain (    /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
    _FDID* obj,         /* Corresponding object */
    DWORD clst          /* Cluster# to stretch, 0:Create a new chain */
)
{
    DWORD cs, ncl, scl;
    FRESULT res;
    FATFS *fs = obj->fs;


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

#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {  /* On the exFAT volume */
        ncl = find_bitmap(fs, scl, 1);              /* Find a free cluster */
        if (ncl == 0 || ncl == 0xFFFFFFFF) return ncl;  /* No free cluster or hard error? */
        res = change_bitmap(fs, ncl, 1, 1);         /* Mark the cluster 'in use' */
        if (res == FR_INT_ERR) return 1;
        if (res == FR_DISK_ERR) return 0xFFFFFFFF;
        if (clst == 0) {                            /* Is it a new chain? */
            obj->stat = 2;                          /* Set status 'contiguous chain' */
        } else {                                    /* This is a stretched chain */
            if (obj->stat == 2 && ncl != scl + 1) { /* Is the chain got fragmented? */
                obj->n_cont = scl - obj->sclust;    /* Set size of the contiguous part */
                obj->stat = 3;                      /* Change status 'just fragmented' */
            }
        }
    } else
#endif
    {   /* On the FAT12/16/32 volume */
        ncl = scl;  /* Start cluster */
        for (;;) {
            ncl++;                          /* Next cluster */
            if (ncl >= fs->n_fatent) {      /* Check wrap-around */
                ncl = 2;
                if (ncl > scl) return 0;    /* No free cluster */
            }
            cs = get_fat(obj, ncl);         /* Get the cluster status */
            if (cs == 0) break;             /* Found a free cluster */
            if (cs == 1 || cs == 0xFFFFFFFF) return cs; /* An error occurred */
            if (ncl == scl) return 0;       /* No free cluster */
        }
    }

    if (_FS_EXFAT && fs->fs_type == FS_EXFAT && obj->stat == 2) {   /* Is it a contiguous chain? */
        res = FR_OK;                        /* FAT does not need to be written */
    } else {
        res = put_fat(fs, ncl, 0xFFFFFFFF); /* Mark the new cluster 'EOC' */
        if (res == FR_OK && clst) {
            res = put_fat(fs, clst, ncl);   /* Link it from the previous one if needed */
        }
    }

    if (res == FR_OK) {         /* Update FSINFO if function succeeded. */
        fs->last_clst = ncl;
        if (fs->free_clst < fs->n_fatent - 2) fs->free_clst--;
        fs->fsi_flag |= 1;
    } else {
        ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;    /* Failed. Create error status */
    }

    return ncl;     /* Return new cluster number or error status */
}

#endif /* !_FS_READONLY */




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

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


    tbl = fp->cltbl + 1;    /* Top of CLMT */
    cl = (DWORD)(ofs / SS(fs) / fs->csize); /* Cluster order from top of the file */
    for (;;) {
        ncl = *tbl++;           /* Number of cluters in the fragment */
        if (ncl == 0) 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 (   /* FR_OK(0):succeeded, !=0:error */
    DIR* dp,        /* Pointer to directory object */
    DWORD ofs       /* Offset of directory table */
)
{
    DWORD csz, clst;
    FATFS *fs = dp->obj.fs;


    if (ofs >= (DWORD)((_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR) || ofs % SZDIRE) {    /* Check range of offset and alignment */
        return FR_INT_ERR;
    }
    dp->dptr = ofs;             /* Set current offset */
    clst = dp->obj.sclust;      /* Table start cluster (0:root) */
    if (clst == 0 && fs->fs_type >= FS_FAT32) { /* Replace cluster# 0 with root cluster# */
        clst = fs->dirbase;
        if (_FS_EXFAT) dp->obj.stat = 0;    /* exFAT: Root dir has an FAT chain */
    }

    if (clst == 0) {    /* Static table (root-directory in FAT12/16) */
        if (ofs / SZDIRE >= fs->n_rootdir)  return FR_INT_ERR;  /* Is index out of range? */
        dp->sect = fs->dirbase;

    } else {            /* Dynamic table (sub-directory or root-directory in FAT32+) */
        csz = (DWORD)fs->csize * SS(fs);    /* Bytes per cluster */
        while (ofs >= csz) {                /* Follow cluster chain */
            clst = get_fat(&dp->obj, clst);             /* Get next cluster */
            if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
            if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR;    /* Reached to end of table or internal error */
            ofs -= csz;
        }
        dp->sect = clust2sect(fs, clst);
    }
    dp->clust = clst;                   /* Current cluster# */
    if (!dp->sect) return FR_INT_ERR;
    dp->sect += ofs / SS(fs);           /* Sector# of the directory entry */
    dp->dir = fs->win + (ofs % SS(fs)); /* Pointer to the entry in the win[] */

    return FR_OK;
}




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

static
FRESULT dir_next (  /* FR_OK(0):succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
    DIR* dp,        /* Pointer to the directory object */
    int stretch     /* 0: Do not stretch table, 1: Stretch table if needed */
)
{
    DWORD ofs, clst;
    FATFS *fs = dp->obj.fs;
#if !_FS_READONLY
    UINT n;
#endif

    ofs = dp->dptr + SZDIRE;    /* Next entry */
    if (!dp->sect || ofs >= (DWORD)((_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR)) return FR_NO_FILE;  /* Report EOT when offset has reached max value */

    if (ofs % SS(fs) == 0) {    /* Sector changed? */
        dp->sect++;             /* Next sector */

        if (!dp->clust) {       /* Static table */
            if (ofs / SZDIRE >= fs->n_rootdir) {    /* Report EOT if it reached end of static table */
                dp->sect = 0; return FR_NO_FILE;
            }
        }
        else {                  /* Dynamic table */
            if ((ofs / SS(fs) & (fs->csize - 1)) == 0) {        /* Cluster changed? */
                clst = get_fat(&dp->obj, dp->clust);            /* Get next cluster */
                if (clst <= 1) return FR_INT_ERR;               /* Internal error */
                if (clst == 0xFFFFFFFF) return FR_DISK_ERR;     /* Disk error */
                if (clst >= fs->n_fatent) {                     /* Reached end of dynamic table */
#if !_FS_READONLY
                    if (!stretch) {                             /* If no stretch, report EOT */
                        dp->sect = 0; return FR_NO_FILE;
                    }
                    clst = create_chain(&dp->obj, dp->clust);   /* Allocate a cluster */
                    if (clst == 0) return FR_DENIED;            /* No free cluster */
                    if (clst == 1) return FR_INT_ERR;           /* Internal error */
                    if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
                    /* Clean-up the stretched table */
                    if (_FS_EXFAT) dp->obj.stat |= 4;           /* The directory needs to be updated */
                    if (sync_window(fs) != FR_OK) return FR_DISK_ERR;   /* Flush disk access window */
                    mem_set(fs->win, 0, SS(fs));                /* Clear window buffer */
                    for (n = 0, fs->winsect = clust2sect(fs, clst); n < fs->csize; n++, fs->winsect++) {    /* Fill the new cluster with 0 */
                        fs->wflag = 1;
                        if (sync_window(fs) != FR_OK) return FR_DISK_ERR;
                    }
                    fs->winsect -= n;                           /* Restore window offset */
#else
                    if (!stretch) dp->sect = 0;                 /* If no stretch, report EOT (this is to suppress warning) */
                    dp->sect = 0; return FR_NO_FILE;            /* Report EOT */
#endif
                }
                dp->clust = clst;       /* Initialize data for new cluster */
                dp->sect = clust2sect(fs, clst);
            }
        }
    }
    dp->dptr = ofs;                     /* Current entry */
    dp->dir = fs->win + ofs % SS(fs);   /* Pointer to the entry in the win[] */

    return FR_OK;
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Directory handling - Reserve a block of directory entries             */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_alloc ( /* FR_OK(0):succeeded, !=0:error */
    DIR* dp,        /* Pointer to the directory object */
    UINT nent       /* Number of contiguous entries to allocate */
)
{
    FRESULT res;
    UINT n;
    FATFS *fs = dp->obj.fs;


    res = dir_sdi(dp, 0);
    if (res == FR_OK) {
        n = 0;
        do {
            res = move_window(fs, dp->sect);
            if (res != FR_OK) break;
#if _FS_EXFAT
            if ((fs->fs_type == FS_EXFAT) ? (int)((dp->dir[XDIR_Type] & 0x80) == 0) : (int)(dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0)) {
#else
            if (dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0) {
#endif
                if (++n == nent) break; /* A block of contiguous free entries is found */
            } else {
                n = 0;                  /* Not a blank entry. Restart to search */
            }
            res = dir_next(dp, 1);
        } while (res == FR_OK); /* Next entry with table stretch enabled */
    }

    if (res == FR_NO_FILE) res = FR_DENIED; /* No directory entry to allocate */
    return res;
}

#endif  /* !_FS_READONLY */




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

static
DWORD ld_clust (    /* Returns the top cluster value of the SFN entry */
    FATFS* fs,      /* Pointer to the fs object */
    const BYTE* dir /* Pointer to the key 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 (
    FATFS* fs,  /* Pointer to the fs object */
    BYTE* dir,  /* Pointer to the key entry */
    DWORD cl    /* Value to be set */
)
{
    st_word(dir + DIR_FstClusLO, (WORD)cl);
    if (fs->fs_type == FS_FAT32) {
        st_word(dir + DIR_FstClusHI, (WORD)(cl >> 16));
    }
}
#endif



#if _USE_LFN != 0
/*------------------------------------------------------------------------*/
/* FAT-LFN: LFN handling                                                  */
/*------------------------------------------------------------------------*/
static
const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};  /* Offset of LFN characters in the directory entry */


/*--------------------------------------------------------*/
/* FAT-LFN: Compare a part of file name with an LFN entry */
/*--------------------------------------------------------*/
static
int cmp_lfn (               /* 1:matched, 0:not matched */
    const WCHAR* lfnbuf,    /* Pointer to the LFN working buffer to be compared */
    BYTE* dir               /* Pointer to the directory entry containing the part of LFN */
)
{
    UINT i, s;
    WCHAR wc, uc;


    if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;   /* Check LDIR_FstClusLO */

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

    for (wc = 1, s = 0; s < 13; s++) {      /* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);      /* Pick an LFN character */
        if (wc) {
            if (i >= _MAX_LFN || ff_wtoupper(uc) != ff_wtoupper(lfnbuf[i++])) { /* Compare it */
                return 0;                   /* Not matched */
            }
            wc = uc;
        } else {
            if (uc != 0xFFFF) return 0;     /* Check filler */
        }
    }

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

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


#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 || _USE_LABEL || _FS_EXFAT
/*-----------------------------------------------------*/
/* FAT-LFN: Pick a part of file name from an LFN entry */
/*-----------------------------------------------------*/
static
int pick_lfn (          /* 1:succeeded, 0:buffer overflow or invalid LFN entry */
    WCHAR* lfnbuf,      /* Pointer to the LFN working buffer */
    BYTE* dir           /* Pointer to the LFN entry */
)
{
    UINT i, s;
    WCHAR wc, uc;


    if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;   /* Check LDIR_FstClusLO */

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

    for (wc = 1, s = 0; s < 13; s++) {      /* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);      /* Pick an LFN character */
        if (wc) {
            if (i >= _MAX_LFN) return 0;    /* Buffer overflow? */
            lfnbuf[i++] = wc = uc;          /* Store it */
        } else {
            if (uc != 0xFFFF) return 0;     /* Check filler */
        }
    }

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

    return 1;       /* The part of LFN is valid */
}
#endif


#if !_FS_READONLY
/*-----------------------------------------*/
/* FAT-LFN: Create an entry of LFN entries */
/*-----------------------------------------*/
static
void put_lfn (
    const WCHAR* lfn,   /* Pointer to the LFN */
    BYTE* dir,          /* Pointer to the LFN entry to be created */
    BYTE ord,           /* LFN order (1-20) */
    BYTE sum            /* Checksum of the corresponding SFN */
)
{
    UINT i, s;
    WCHAR wc;


    dir[LDIR_Chksum] = sum;         /* Set checksum */
    dir[LDIR_Attr] = AM_LFN;        /* Set attribute. LFN entry */
    dir[LDIR_Type] = 0;
    st_word(dir + LDIR_FstClusLO, 0);

    i = (ord - 1) * 13;             /* Get offset in the LFN working buffer */
    s = wc = 0;
    do {
        if (wc != 0xFFFF) wc = lfn[i++];    /* Get an effective character */
        st_word(dir + LfnOfs[s], wc);       /* Put it */
        if (wc == 0) wc = 0xFFFF;       /* Padding characters for left locations */
    } while (++s < 13);
    if (wc == 0xFFFF || !lfn[i]) ord |= LLEF;   /* Last LFN part is the start of LFN sequence */
    dir[LDIR_Ord] = ord;            /* Set the LFN order */
}

#endif  /* !_FS_READONLY */
#endif  /* _USE_LFN != 0 */



#if _USE_LFN != 0 && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Create a Numbered SFN                                        */
/*-----------------------------------------------------------------------*/

static
void gen_numname (
    BYTE* dst,          /* Pointer to the buffer to store numbered SFN */
    const BYTE* src,    /* Pointer to SFN */
    const WCHAR* lfn,   /* Pointer to LFN */
    UINT seq            /* Sequence number */
)
{
    BYTE ns[8], c;
    UINT i, j;
    WCHAR wc;
    DWORD sr;


    mem_cpy(dst, src, 11);

    if (seq > 5) {  /* In case of many collisions, generate a hash number instead of sequential number */
        sr = seq;
        while (*lfn) {  /* Create a CRC */
            wc = *lfn++;
            for (i = 0; i < 16; i++) {
                sr = (sr << 1) + (wc & 1);
                wc >>= 1;
                if (sr & 0x10000) sr ^= 0x11021;
            }
        }
        seq = (UINT)sr;
    }

    /* itoa (hexdecimal) */
    i = 7;
    do {
        c = (BYTE)((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  /* _USE_LFN != 0 && !_FS_READONLY */



#if _USE_LFN != 0
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Calculate checksum of an SFN entry                           */
/*-----------------------------------------------------------------------*/

static
BYTE sum_sfn (
    const BYTE* dir     /* Pointer to the SFN entry */
)
{
    BYTE sum = 0;
    UINT n = 11;

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

#endif  /* _USE_LFN != 0 */



#if _FS_EXFAT
/*-----------------------------------------------------------------------*/
/* exFAT: Checksum                                                       */
/*-----------------------------------------------------------------------*/

static
WORD xdir_sum (         /* Get checksum of the directoly block */
    const BYTE* dir     /* Directory entry block to be calculated */
)
{
    UINT i, szblk;
    WORD sum;


    szblk = (dir[XDIR_NumSec] + 1) * SZDIRE;
    for (i = sum = 0; i < szblk; i++) {
        if (i == XDIR_SetSum) { /* Skip sum field */
            i++;
        } else {
            sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + dir[i];
        }
    }
    return sum;
}



static
WORD xname_sum (        /* Get check sum (to be used as hash) of the name */
    const WCHAR* name   /* File name to be calculated */
)
{
    WCHAR chr;
    WORD sum = 0;


    while ((chr = *name++) != 0) {
        chr = ff_wtoupper(chr);     /* File name needs to be ignored case */
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr & 0xFF);
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr >> 8);
    }
    return sum;
}


#if !_FS_READONLY && _USE_MKFS
static
DWORD xsum32 (
    BYTE  dat,  /* Data to be sumed */
    DWORD sum   /* Previous value */
)
{
    sum = ((sum & 1) ? 0x80000000 : 0) + (sum >> 1) + dat;
    return sum;
}
#endif


#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2
/*------------------------------------------------------*/
/* exFAT: Get object information from a directory block */
/*------------------------------------------------------*/

static
void get_xdir_info (
    BYTE* dirb,         /* Pointer to the direcotry entry block 85+C0+C1s */
    FILINFO* fno        /* Buffer to store the extracted file information */
)
{
    UINT di, si;
    WCHAR w;
#if !_LFN_UNICODE
    UINT nc;
#endif

    /* Get file name */
#if _LFN_UNICODE
    if (dirb[XDIR_NumName] <= _MAX_LFN) {
        for (si = SZDIRE * 2, di = 0; di < dirb[XDIR_NumName]; si += 2, di++) {
            if ((si % SZDIRE) == 0) si += 2;    /* Skip entry type field */
            w = ld_word(dirb + si);             /* Get a character */
            fno->fname[di] = w;                 /* Store it */
        }
    } else {
        di = 0; /* Buffer overflow and inaccessible object */
    }
#else
    for (si = SZDIRE * 2, di = nc = 0; nc < dirb[XDIR_NumName]; si += 2, nc++) {
        if ((si % SZDIRE) == 0) si += 2;    /* Skip entry type field */
        w = ld_word(dirb + si);             /* Get a character */
        w = ff_convert(w, 0);               /* Unicode -> OEM */
        if (w == 0) { di = 0; break; }      /* Could not be converted and inaccessible object */
        if (_DF1S && w >= 0x100) {          /* Put 1st byte if it is a DBC (always false at SBCS cfg) */
            fno->fname[di++] = (char)(w >> 8);
        }
        if (di >= _MAX_LFN) { di = 0; break; }  /* Buffer overflow and inaccessible object */
        fno->fname[di++] = (char)w;
    }
#endif
    if (di == 0) fno->fname[di++] = '?';    /* Inaccessible object? */
    fno->fname[di] = 0;                     /* Terminate file name */

    fno->altname[0] = 0;                            /* No SFN */
    fno->fattrib = dirb[XDIR_Attr];                 /* Attribute */
    fno->fsize = (fno->fattrib & AM_DIR) ? 0 : ld_qword(dirb + XDIR_FileSize);  /* Size */
    fno->ftime = ld_word(dirb + XDIR_ModTime + 0);  /* Time */
    fno->fdate = ld_word(dirb + XDIR_ModTime + 2);  /* Date */
}

#endif  /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 */


/*-----------------------------------*/
/* exFAT: Get a directry entry block */
/*-----------------------------------*/

static
FRESULT load_xdir ( /* FR_INT_ERR: invalid entry block */
    DIR* dp         /* Pointer to the reading direcotry object pointing the 85 entry */
)
{
    FRESULT res;
    UINT i, nent;
    BYTE* dirb = dp->obj.fs->dirbuf;    /* Pointer to the on-memory direcotry entry block 85+C0+C1s */


    /* Load 85 entry */
    res = move_window(dp->obj.fs, dp->sect);
    if (res != FR_OK) return res;
    if (dp->dir[XDIR_Type] != 0x85) return FR_INT_ERR;
    mem_cpy(dirb, dp->dir, SZDIRE);
    nent = dirb[XDIR_NumSec] + 1;

    /* Load C0 entry */
    res = dir_next(dp, 0);
    if (res != FR_OK) return res;
    res = move_window(dp->obj.fs, dp->sect);
    if (res != FR_OK) return res;
    if (dp->dir[XDIR_Type] != 0xC0) return FR_INT_ERR;
    mem_cpy(dirb + SZDIRE, dp->dir, SZDIRE);

    /* Load C1 entries */
    if (nent < 3 || nent > 19) return FR_NO_FILE;
    i = SZDIRE * 2; nent *= SZDIRE;
    do {
        res = dir_next(dp, 0);
        if (res != FR_OK) return res;
        res = move_window(dp->obj.fs, dp->sect);
        if (res != FR_OK) return res;
        if (dp->dir[XDIR_Type] != 0xC1) return FR_INT_ERR;
        mem_cpy(dirb + i, dp->dir, SZDIRE);
        i += SZDIRE;
    } while (i < nent);

    /* Sanity check */
    if (xdir_sum(dirb) != ld_word(dirb + XDIR_SetSum)) return FR_INT_ERR;

    return FR_OK;
}


#if !_FS_READONLY || _FS_RPATH != 0
/*------------------------------------------------*/
/* exFAT: Load the object's directory entry block */
/*------------------------------------------------*/
static
FRESULT load_obj_dir (
    DIR* dp,            /* Blank directory object to be used to access containing direcotry */
    const _FDID* obj    /* Object with containing directory information */
)
{
    FRESULT res;


    /* Open object containing directory */
    dp->obj.fs = obj->fs;
    dp->obj.sclust = obj->c_scl;
    dp->obj.stat = (BYTE)obj->c_size;
    dp->obj.objsize = obj->c_size & 0xFFFFFF00;
    dp->blk_ofs = obj->c_ofs;

    res = dir_sdi(dp, dp->blk_ofs); /* Goto the block location */
    if (res == FR_OK) {
        res = load_xdir(dp);        /* Load the object's entry block */
    }
    return res;
}
#endif


#if !_FS_READONLY
/*-----------------------------------------------*/
/* exFAT: Store the directory block to the media */
/*-----------------------------------------------*/
static
FRESULT store_xdir (
    DIR* dp             /* Pointer to the direcotry object */
)
{
    FRESULT res;
    UINT nent;
    BYTE* dirb = dp->obj.fs->dirbuf;    /* Pointer to the direcotry entry block 85+C0+C1s */

    /* Create set sum */
    st_word(dirb + XDIR_SetSum, xdir_sum(dirb));
    nent = dirb[XDIR_NumSec] + 1;

    /* Store the set of directory to the volume */
    res = dir_sdi(dp, dp->blk_ofs);
    while (res == FR_OK) {
        res = move_window(dp->obj.fs, dp->sect);
        if (res != FR_OK) break;
        mem_cpy(dp->dir, dirb, SZDIRE);
        dp->obj.fs->wflag = 1;
        if (--nent == 0) break;
        dirb += SZDIRE;
        res = dir_next(dp, 0);
    }
    return (res == FR_OK || res == FR_DISK_ERR) ? res : FR_INT_ERR;
}



/*-------------------------------------------*/
/* exFAT: Create a new directory enrty block */
/*-------------------------------------------*/

static
void create_xdir (
    BYTE* dirb,         /* Pointer to the direcotry entry block buffer */
    const WCHAR* lfn    /* Pointer to the nul terminated file name */
)
{
    UINT i;
    BYTE nb, nc;
    WCHAR chr;


    mem_set(dirb, 0, 2 * SZDIRE);           /* Initialize 85+C0 entry */
    dirb[XDIR_Type] = 0x85;
    dirb[XDIR_Type + SZDIRE] = 0xC0;
    st_word(dirb + XDIR_NameHash, xname_sum(lfn));  /* Set name hash */

    i = SZDIRE * 2; /* C1 offset */
    nc = 0; nb = 1; chr = 1;
    do {
        dirb[i++] = 0xC1; dirb[i++] = 0;    /* Entry type C1 */
        do {    /* Fill name field */
            if (chr && (chr = lfn[nc]) != 0) nc++;  /* Get a character if exist */
            st_word(dirb + i, chr); i += 2; /* Store it */
        } while (i % SZDIRE);
        nb++;
    } while (lfn[nc]);  /* Fill next entry if any char follows */

    dirb[XDIR_NumName] = nc;    /* Set name length */
    dirb[XDIR_NumSec] = nb;     /* Set number of C0+C1s */
}

#endif  /* !_FS_READONLY */
#endif  /* _FS_EXFAT */



#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 || _USE_LABEL || _FS_EXFAT
/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_read (
    DIR* dp,        /* Pointer to the directory object */
    int vol         /* Filtered by 0:file/directory or 1:volume label */
)
{
    FRESULT res = FR_NO_FILE;
    FATFS *fs = dp->obj.fs;
    BYTE a, c;
#if _USE_LFN != 0
    BYTE ord = 0xFF, sum = 0xFF;
#endif

    while (dp->sect) {
        res = move_window(fs, dp->sect);
        if (res != FR_OK) break;
        c = dp->dir[DIR_Name];  /* Test for the entry type */
        if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of the directory */
#if _FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {  /* On the exFAT volume */
            if (_USE_LABEL && vol) {
                if (c == 0x83) break;   /* Volume label entry? */
            } else {
                if (c == 0x85) {        /* Start of the file entry block? */
                    dp->blk_ofs = dp->dptr; /* Get location of the block */
                    res = load_xdir(dp);    /* Load the entry block */
                    if (res == FR_OK) {
                        dp->obj.attr = fs->dirbuf[XDIR_Attr] & AM_MASK; /* Get attribute */
                    }
                    break;
                }
            }
        } else
#endif
        {   /* On the FAT12/16/32 volume */
            dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK; /* Get attribute */
#if _USE_LFN != 0   /* LFN configuration */
            if (c == DDEM || c == '.' || (int)((a & ~AM_ARC) == AM_VOL) != vol) {   /* An entry without valid data */
                ord = 0xFF;
            } else {
                if (a == AM_LFN) {          /* An LFN entry is found */
                    if (c & LLEF) {         /* Is it start of an LFN sequence? */
                        sum = dp->dir[LDIR_Chksum];
                        c &= (BYTE)~LLEF; ord = c;
                        dp->blk_ofs = dp->dptr;
                    }
                    /* Check LFN validity and capture it */
                    ord = (c == ord && sum == dp->dir[LDIR_Chksum] && pick_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
                } else {                    /* An SFN entry is found */
                    if (ord || sum != sum_sfn(dp->dir)) {   /* Is there a valid LFN? */
                        dp->blk_ofs = 0xFFFFFFFF;           /* It has no LFN. */
                    }
                    break;
                }
            }
#else       /* Non LFN configuration */
            if (c != DDEM && c != '.' && a != AM_LFN && (int)((a & ~AM_ARC) == AM_VOL) == vol) {    /* Is it a valid entry? */
                break;
            }
#endif
        }
        res = dir_next(dp, 0);      /* Next entry */
        if (res != FR_OK) break;
    }

    if (res != FR_OK) dp->sect = 0;     /* Terminate the read operation on error or EOT */
    return res;
}

#endif  /* _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2 */



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

static
FRESULT dir_find (  /* FR_OK(0):succeeded, !=0:error */
    DIR* dp         /* Pointer to the directory object with the file name */
)
{
    FRESULT res;
    FATFS *fs = dp->obj.fs;
    BYTE c;
#if _USE_LFN != 0
    BYTE a, ord, sum;
#endif

    res = dir_sdi(dp, 0);           /* Rewind directory object */
    if (res != FR_OK) return res;
#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {  /* On the exFAT volume */
        BYTE nc;
        UINT di, ni;
        WORD hash = xname_sum(fs->lfnbuf);      /* Hash value of the name to find */

        while ((res = dir_read(dp, 0)) == FR_OK) {  /* Read an item */
            if (ld_word(fs->dirbuf + XDIR_NameHash) != hash) continue;  /* Skip the comparison if hash value mismatched */
            for (nc = fs->dirbuf[XDIR_NumName], di = SZDIRE * 2, ni = 0; nc; nc--, di += 2, ni++) { /* Compare the name */
                if ((di % SZDIRE) == 0) di += 2;
                if (ff_wtoupper(ld_word(fs->dirbuf + di)) != ff_wtoupper(fs->lfnbuf[ni])) break;
            }
            if (nc == 0 && !fs->lfnbuf[ni]) break;  /* Name matched? */
        }
        return res;
    }
#endif
    /* On the FAT12/16/32 volume */
#if _USE_LFN != 0
    ord = sum = 0xFF; dp->blk_ofs = 0xFFFFFFFF; /* Reset LFN sequence */
#endif
    do {
        res = move_window(fs, dp->sect);
        if (res != FR_OK) break;
        c = dp->dir[DIR_Name];
        if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of table */
#if _USE_LFN != 0   /* LFN configuration */
        dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;
        if (c == DDEM || ((a & AM_VOL) && a != AM_LFN)) {   /* An entry without valid data */
            ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF;   /* Reset LFN sequence */
        } else {
            if (a == AM_LFN) {          /* An LFN entry is found */
                if (!(dp->fn[NSFLAG] & NS_NOLFN)) {
                    if (c & LLEF) {     /* Is it start of LFN sequence? */
                        sum = dp->dir[LDIR_Chksum];
                        c &= (BYTE)~LLEF; ord = c;  /* LFN start order */
                        dp->blk_ofs = dp->dptr; /* Start offset of LFN */
                    }
                    /* Check validity of the LFN entry and compare it with given name */
                    ord = (c == ord && sum == dp->dir[LDIR_Chksum] && cmp_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
                }
            } else {                    /* An SFN entry is found */
                if (!ord && sum == sum_sfn(dp->dir)) break; /* LFN matched? */
                if (!(dp->fn[NSFLAG] & NS_LOSS) && !mem_cmp(dp->dir, dp->fn, 11)) break;    /* SFN matched? */
                ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF;   /* Reset LFN sequence */
            }
        }
#else       /* Non LFN configuration */
        dp->obj.attr = dp->dir[DIR_Attr] & AM_MASK;
        if (!(dp->dir[DIR_Attr] & AM_VOL) && !mem_cmp(dp->dir, dp->fn, 11)) break;  /* Is it a valid entry? */
#endif
        res = dir_next(dp, 0);  /* Next entry */
    } while (res == FR_OK);

    return res;
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Register an object to the directory                                   */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_register (  /* FR_OK:succeeded, FR_DENIED:no free entry or too many SFN collision, FR_DISK_ERR:disk error */
    DIR* dp             /* Target directory with object name to be created */
)
{
    FRESULT res;
    FATFS *fs = dp->obj.fs;
#if _USE_LFN != 0   /* LFN configuration */
    UINT n, nlen, nent;
    BYTE sn[12], sum;


    if (dp->fn[NSFLAG] & (NS_DOT | NS_NONAME)) return FR_INVALID_NAME;  /* Check name validity */
    for (nlen = 0; fs->lfnbuf[nlen]; nlen++) ;  /* Get lfn length */

#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {  /* On the exFAT volume */
        DIR dj;

        nent = (nlen + 14) / 15 + 2;    /* Number of entries to allocate (85+C0+C1s) */
        res = dir_alloc(dp, nent);      /* Allocate entries */
        if (res != FR_OK) return res;
        dp->blk_ofs = dp->dptr - SZDIRE * (nent - 1);           /* Set block position */

        if (dp->obj.sclust != 0 && (dp->obj.stat & 4)) {    /* Has the sub-directory been stretched? */
            dp->obj.stat &= 3;
            dp->obj.objsize += (DWORD)fs->csize * SS(fs);   /* Increase object size by cluster size */
            res = fill_fat_chain(&dp->obj); /* Complement FAT chain if needed */
            if (res != FR_OK) return res;
            res = load_obj_dir(&dj, &dp->obj);
            if (res != FR_OK) return res;   /* Load the object status */
            st_qword(fs->dirbuf + XDIR_FileSize, dp->obj.objsize);      /* Update the allocation status */
            st_qword(fs->dirbuf + XDIR_ValidFileSize, dp->obj.objsize);
            fs->dirbuf[XDIR_GenFlags] = dp->obj.stat | 1;
            res = store_xdir(&dj);          /* Store the object status */
            if (res != FR_OK) return res;
        }

        create_xdir(fs->dirbuf, fs->lfnbuf);    /* Create on-memory directory block to be written later */
        return FR_OK;
    }
#endif
    /* On the FAT12/16/32 volume */
    mem_cpy(sn, dp->fn, 12);
    if (sn[NSFLAG] & NS_LOSS) {         /* When LFN is out of 8.3 format, generate a numbered name */
        dp->fn[NSFLAG] = NS_NOLFN;      /* Find only SFN */
        for (n = 1; n < 100; n++) {
            gen_numname(dp->fn, sn, fs->lfnbuf, n); /* Generate a numbered name */
            res = dir_find(dp);             /* Check if the name collides with existing SFN */
            if (res != FR_OK) break;
        }
        if (n == 100) return FR_DENIED;     /* Abort if too many collisions */
        if (res != FR_NO_FILE) return res;  /* Abort if the result is other than 'not collided' */
        dp->fn[NSFLAG] = sn[NSFLAG];
    }

    /* Create an SFN with/without LFNs. */
    nent = (sn[NSFLAG] & NS_LFN) ? (nlen + 12) / 13 + 1 : 1;    /* Number of entries to allocate */
    res = dir_alloc(dp, nent);      /* Allocate entries */
    if (res == FR_OK && --nent) {   /* Set LFN entry if needed */
        res = dir_sdi(dp, dp->dptr - nent * SZDIRE);
        if (res == FR_OK) {
            sum = sum_sfn(dp->fn);  /* Checksum value of the SFN tied to the LFN */
            do {                    /* Store LFN entries in bottom first */
                res = move_window(fs, dp->sect);
                if (res != FR_OK) break;
                put_lfn(fs->lfnbuf, dp->dir, (BYTE)nent, sum);
                fs->wflag = 1;
                res = dir_next(dp, 0);  /* Next entry */
            } while (res == FR_OK && --nent);
        }
    }

#else   /* Non LFN configuration */
    res = dir_alloc(dp, 1);     /* Allocate an entry for SFN */

#endif

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

    return res;
}

#endif /* !_FS_READONLY */



#if !_FS_READONLY && _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Remove an object from the directory                                   */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_remove (    /* FR_OK:Succeeded, FR_DISK_ERR:A disk error */
    DIR* dp             /* Directory object pointing the entry to be removed */
)
{
    FRESULT res;
    FATFS *fs = dp->obj.fs;
#if _USE_LFN != 0   /* LFN configuration */
    DWORD last = dp->dptr;

    res = (dp->blk_ofs == 0xFFFFFFFF) ? FR_OK : dir_sdi(dp, dp->blk_ofs);   /* Goto top of the entry block if LFN is exist */
    if (res == FR_OK) {
        do {
            res = move_window(fs, dp->sect);
            if (res != FR_OK) break;
            /* Mark an entry 'deleted' */
            if (_FS_EXFAT && fs->fs_type == FS_EXFAT) { /* On the exFAT volume */
                dp->dir[XDIR_Type] &= 0x7F;
            } else {                                    /* On the FAT12/16/32 volume */
                dp->dir[DIR_Name] = DDEM;
            }
            fs->wflag = 1;
            if (dp->dptr >= last) break;    /* If reached last entry then all entries of the object has been deleted. */
            res = dir_next(dp, 0);  /* Next entry */
        } while (res == FR_OK);
        if (res == FR_NO_FILE) res = FR_INT_ERR;
    }
#else           /* Non LFN configuration */

    res = move_window(fs, dp->sect);
    if (res == FR_OK) {
        dp->dir[DIR_Name] = DDEM;
        fs->wflag = 1;
    }
#endif

    return res;
}

#endif /* !_FS_READONLY && _FS_MINIMIZE == 0 */



#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2
/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/

static
void get_fileinfo (     /* No return code */
    DIR* dp,            /* Pointer to the directory object */
    FILINFO* fno        /* Pointer to the file information to be filled */
)
{
    UINT i, j;
    TCHAR c;
    DWORD tm;
#if _USE_LFN != 0
    WCHAR w, lfv;
    FATFS *fs = dp->obj.fs;
#endif


    fno->fname[0] = 0;      /* Invaidate file info */
    if (!dp->sect) return;  /* Exit if read pointer has reached end of directory */

#if _USE_LFN != 0   /* LFN configuration */
#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {  /* On the exFAT volume */
        get_xdir_info(fs->dirbuf, fno);
        return;
    } else
#endif
    {   /* On the FAT12/16/32 volume */
        if (dp->blk_ofs != 0xFFFFFFFF) {    /* Get LFN if available */
            i = j = 0;
            while ((w = fs->lfnbuf[j++]) != 0) {    /* Get an LFN character */
#if !_LFN_UNICODE
                w = ff_convert(w, 0);       /* Unicode -> OEM */
                if (w == 0) { i = 0; break; }   /* No LFN if it could not be converted */
                if (_DF1S && w >= 0x100) {  /* Put 1st byte if it is a DBC (always false at SBCS cfg) */
                    fno->fname[i++] = (char)(w >> 8);
                }
#endif
                if (i >= _MAX_LFN) { i = 0; break; }    /* No LFN if buffer overflow */
                fno->fname[i++] = (TCHAR)w;
            }
            fno->fname[i] = 0;  /* Terminate the LFN */
        }
    }

    i = j = 0;
    lfv = fno->fname[i];    /* LFN is exist if non-zero */
    while (i < 11) {        /* Copy name body and extension */
        c = (TCHAR)dp->dir[i++];
        if (c == ' ') continue;             /* Skip padding spaces */
        if (c == RDDEM) c = (TCHAR)DDEM;    /* Restore replaced DDEM character */
        if (i == 9) {                       /* Insert a . if extension is exist */
            if (!lfv) fno->fname[j] = '.';
            fno->altname[j++] = '.';
        }
#if _LFN_UNICODE
        if (IsDBCS1(c) && i != 8 && i != 11 && IsDBCS2(dp->dir[i])) {
            c = c << 8 | dp->dir[i++];
        }
        c = ff_convert(c, 1);   /* OEM -> Unicode */
        if (!c) c = '?';
#endif
        fno->altname[j] = c;
        if (!lfv) {
            if (IsUpper(c) && (dp->dir[DIR_NTres] & (i >= 9 ? NS_EXT : NS_BODY))) {
                c += 0x20;          /* To lower */
            }
            fno->fname[j] = c;
        }
        j++;
    }
    if (!lfv) {
        fno->fname[j] = 0;
        if (!dp->dir[DIR_NTres]) j = 0; /* Altname is no longer needed if neither LFN nor case info is exist. */
    }
    fno->altname[j] = 0;    /* Terminate the SFN */

#else   /* Non-LFN configuration */
    i = j = 0;
    while (i < 11) {        /* Copy name body and extension */
        c = (TCHAR)dp->dir[i++];
        if (c == ' ') continue;             /* Skip padding spaces */
        if (c == RDDEM) c = (TCHAR)DDEM;    /* Restore replaced DDEM character */
        if (i == 9) fno->fname[j++] = '.';  /* Insert a . if extension is exist */
        fno->fname[j++] = c;
    }
    fno->fname[j] = 0;
#endif

    fno->fattrib = dp->dir[DIR_Attr];               /* Attribute */
    fno->fsize = ld_dword(dp->dir + DIR_FileSize);  /* Size */
    tm = ld_dword(dp->dir + DIR_ModTime);           /* Timestamp */
    fno->ftime = (WORD)tm; fno->fdate = (WORD)(tm >> 16);
}

#endif /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 */



#if _USE_FIND && _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Pattern matching                                                      */
/*-----------------------------------------------------------------------*/

static
WCHAR get_achar (       /* Get a character and advances ptr 1 or 2 */
    const TCHAR** ptr   /* Pointer to pointer to the SBCS/DBCS/Unicode string */
)
{
#if !_LFN_UNICODE
    WCHAR chr;

    chr = (BYTE)*(*ptr)++;                  /* Get a byte */
    if (IsLower(chr)) chr -= 0x20;          /* To upper ASCII char */
#ifdef _EXCVT
    if (chr >= 0x80) chr = ExCvt[chr - 0x80];   /* To upper SBCS extended char */
#else
    if (IsDBCS1(chr) && IsDBCS2(**ptr)) {       /* Get DBC 2nd byte if needed */
        chr = chr << 8 | (BYTE)*(*ptr)++;
    }
#endif
    return chr;
#else
    return ff_wtoupper(*(*ptr)++);          /* Get a word and to upper */
#endif
}


static
int pattern_matching (  /* 0:not matched, 1:matched */
    const TCHAR* pat,   /* Matching pattern */
    const TCHAR* nam,   /* String to be tested */
    int skip,           /* Number of pre-skip chars (number of ?s) */
    int inf             /* Infinite search (* specified) */
)
{
    const TCHAR *pp, *np;
    WCHAR pc, nc;
    int nm, nx;


    while (skip--) {                /* Pre-skip name chars */
        if (!get_achar(&nam)) return 0; /* Branch mismatched if less name chars */
    }
    if (!*pat && inf) return 1;     /* (short circuit) */

    do {
        pp = pat; np = nam;         /* Top of pattern and name to match */
        for (;;) {
            if (*pp == '?' || *pp == '*') { /* Wildcard? */
                nm = nx = 0;
                do {                /* Analyze the wildcard chars */
                    if (*pp++ == '?') nm++; else nx = 1;
                } while (*pp == '?' || *pp == '*');
                if (pattern_matching(pp, np, nm, nx)) return 1; /* Test new branch (recurs upto number of wildcard blocks in the pattern) */
                nc = *np; break;    /* Branch mismatched */
            }
            pc = get_achar(&pp);    /* Get a pattern char */
            nc = get_achar(&np);    /* Get a name char */
            if (pc != nc) break;    /* Branch mismatched? */
            if (pc == 0) return 1;  /* Branch matched? (matched at end of both strings) */
        }
        get_achar(&nam);            /* nam++ */
    } while (inf && nc);            /* Retry until end of name if infinite search is specified */

    return 0;
}

#endif /* _USE_FIND && _FS_MINIMIZE <= 1 */



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

static
FRESULT create_name (   /* FR_OK: successful, FR_INVALID_NAME: could not create */
    DIR* dp,            /* Pointer to the directory object */
    const TCHAR** path  /* Pointer to pointer to the segment in the path string */
)
{
#if _USE_LFN != 0   /* LFN configuration */
    BYTE b, cf;
    WCHAR w, *lfn;
    UINT i, ni, si, di;
    const TCHAR *p;

    /* Create LFN in Unicode */
    p = *path; lfn = dp->obj.fs->lfnbuf; si = di = 0;
    for (;;) {
        w = p[si++];                    /* Get a character */
        if (w < ' ') break;             /* Break if end of the path name */
        if (w == '/' || w == '\\') {    /* Break if a separator is found */
            while (p[si] == '/' || p[si] == '\\') si++; /* Skip duplicated separator if exist */
            break;
        }
        if (di >= _MAX_LFN) return FR_INVALID_NAME; /* Reject too long 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 */
            w = (w << 8) + b;           /* Create a DBC */
            if (!IsDBCS2(b)) return FR_INVALID_NAME;    /* Reject invalid sequence */
        }
        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)) return FR_INVALID_NAME;    /* Reject illegal characters for LFN */
        lfn[di++] = w;                  /* Store the Unicode character */
    }
    *path = &p[si];                     /* Return pointer to the next segment */
    cf = (w < ' ') ? NS_LAST : 0;       /* Set last segment flag if end of the path */
#if _FS_RPATH != 0
    if ((di == 1 && lfn[di - 1] == '.') ||
        (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) {    /* Is this segment a dot name? */
        lfn[di] = 0;
        for (i = 0; i < 11; i++)        /* Create dot name for SFN entry */
            dp->fn[i] = (i < di) ? '.' : ' ';
        dp->fn[i] = cf | NS_DOT;        /* This is a dot entry */
        return FR_OK;
    }
#endif
    while (di) {                        /* Snip off trailing spaces and dots if exist */
        w = lfn[di - 1];
        if (w != ' ' && w != '.') break;
        di--;
    }
    lfn[di] = 0;                        /* LFN is created */
    if (di == 0) return FR_INVALID_NAME;    /* Reject nul name */

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

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

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

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

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

    if (dp->fn[0] == DDEM) dp->fn[0] = RDDEM;   /* If the first character collides with DDEM, replace it with RDDEM */

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

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

    return FR_OK;


#else   /* _USE_LFN != 0 : Non-LFN configuration */
    BYTE c, d, *sfn;
    UINT ni, si, i;
    const char *p;

    /* Create file name in directory form */
    p = *path; sfn = dp->fn;
    mem_set(sfn, ' ', 11);
    si = i = 0; ni = 8;
#if _FS_RPATH != 0
    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[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;   /* Set last segment flag if end of the path */
        return FR_OK;
    }
#endif
    for (;;) {
        c = (BYTE)p[si++];
        if (c <= ' ') break;            /* Break if end of the path name */
        if (c == '/' || c == '\\') {    /* Break if a separator is found */
            while (p[si] == '/' || p[si] == '\\') si++; /* Skip duplicated separator if exist */
            break;
        }
        if (c == '.' || i >= ni) {      /* End of body or over size? */
            if (ni == 11 || c != '.') return FR_INVALID_NAME;   /* Over size or invalid dot */
            i = 8; ni = 11;             /* Goto extension */
            continue;
        }
        if (c >= 0x80) {                /* Extended character? */
#ifdef _EXCVT
            c = ExCvt[c - 0x80];        /* To upper extended characters (SBCS cfg) */
#else
#if !_DF1S
            return FR_INVALID_NAME;     /* Reject extended characters (ASCII only cfg) */
#endif
#endif
        }
        if (IsDBCS1(c)) {               /* Check if it is a DBC 1st byte (always false at SBCS cfg.) */
            d = (BYTE)p[si++];          /* Get 2nd byte */
            if (!IsDBCS2(d) || i >= ni - 1) return FR_INVALID_NAME; /* Reject invalid DBC */
            sfn[i++] = c;
            sfn[i++] = d;
        } else {                        /* SBC */
            if (chk_chr("\"*+,:;<=>\?[]|\x7F", c)) return FR_INVALID_NAME;  /* Reject illegal chrs for SFN */
            if (IsLower(c)) c -= 0x20;  /* To upper */
            sfn[i++] = c;
        }
    }
    *path = p + si;                     /* Return pointer to the next segment */
    if (i == 0) return FR_INVALID_NAME; /* Reject nul string */

    if (sfn[0] == DDEM) sfn[0] = RDDEM; /* If the first character collides with DDEM, replace it with RDDEM */
    sfn[NSFLAG] = (c <= ' ') ? NS_LAST : 0;     /* Set last segment flag if end of the path */

    return FR_OK;
#endif /* _USE_LFN != 0 */
}




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

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


#if _FS_RPATH != 0
    if (*path != '/' && *path != '\\') {    /* Without heading separator */
        obj->sclust = fs->cdir;             /* Start from the current directory */
    } else
#endif
    {                                       /* With heading separator */
        while (*path == '/' || *path == '\\') path++;   /* Strip heading separator */
        obj->sclust = 0;                    /* Start from the root directory */
    }
#if _FS_EXFAT && _FS_RPATH != 0
    if (fs->fs_type == FS_EXFAT && obj->sclust) {   /* Retrieve the sub-directory status if needed */
        DIR dj;

        obj->c_scl = fs->cdc_scl;
        obj->c_size = fs->cdc_size;
        obj->c_ofs = fs->cdc_ofs;
        res = load_obj_dir(&dj, obj);
        if (res != FR_OK) return res;
        obj->objsize = ld_dword(fs->dirbuf + XDIR_FileSize);
        obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;
    }
#endif

    if ((UINT)*path < ' ') {                /* Null path name is the origin directory itself */
        dp->fn[NSFLAG] = NS_NONAME;
        res = dir_sdi(dp, 0);

    } else {                                /* Follow path */
        for (;;) {
            res = create_name(dp, &path);   /* Get a segment name of the path */
            if (res != FR_OK) break;
            res = dir_find(dp);             /* Find an object with the segment name */
            ns = dp->fn[NSFLAG];
            if (res != FR_OK) {             /* Failed to find the object */
                if (res == FR_NO_FILE) {    /* Object is not found */
                    if (_FS_RPATH && (ns & NS_DOT)) {   /* If dot entry is not exist, stay there */
                        if (!(ns & NS_LAST)) continue;  /* Continue to follow if not last segment */
                        dp->fn[NSFLAG] = NS_NONAME;
                        res = FR_OK;
                    } else {                            /* Could not find the object */
                        if (!(ns & NS_LAST)) res = FR_NO_PATH;  /* Adjust error code if not last segment */
                    }
                }
                break;
            }
            if (ns & NS_LAST) break;            /* Last segment matched. Function completed. */
            /* Get into the sub-directory */
            if (!(obj->attr & AM_DIR)) {        /* It is not a sub-directory and cannot follow */
                res = FR_NO_PATH; break;
            }
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                obj->c_scl = obj->sclust;       /* Save containing directory information for next dir */
                obj->c_size = ((DWORD)obj->objsize & 0xFFFFFF00) | obj->stat;
                obj->c_ofs = dp->blk_ofs;
                obj->sclust = ld_dword(fs->dirbuf + XDIR_FstClus);  /* Open next directory */
                obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;
                obj->objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
            } else
#endif
            {
                obj->sclust = ld_clust(fs, fs->win + dp->dptr % SS(fs));    /* Open next directory */
            }
        }
    }

    return res;
}




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

static
BYTE check_fs ( /* 0:FAT, 1:exFAT, 2:Valid BS but not FAT, 3:Not a BS, 4:Disk error */
    FATFS* fs,  /* File system object */
    DWORD sect  /* Sector# (lba) to check if it is an FAT-VBR or not */
)
{
    fs->wflag = 0; fs->winsect = 0xFFFFFFFF;        /* Invaidate window */
    if (move_window(fs, sect) != FR_OK) return 4;   /* Load boot record */

    if (ld_word(fs->win + BS_55AA) != 0xAA55) return 3; /* Check boot record signature (always placed at offset 510 even if the sector size is >512) */

    if (fs->win[BS_JmpBoot] == 0xE9 || (fs->win[BS_JmpBoot] == 0xEB && fs->win[BS_JmpBoot + 2] == 0x90)) {
        if ((ld_dword(fs->win + BS_FilSysType) & 0xFFFFFF) == 0x544146) return 0;   /* Check "FAT" string */
        if (ld_dword(fs->win + BS_FilSysType32) == 0x33544146) return 0;            /* Check "FAT3" string */
    }
#if _FS_EXFAT
    if (!mem_cmp(fs->win + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11)) return 1;
#endif
    return 2;
}




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

static
FRESULT find_volume (   /* FR_OK(0): successful, !=0: any error occurred */
    FATFS* fs,          /* Pointer to the file system object */
    BYTE mode           /* !=0: Check write protection for write access */
)
{
    BYTE fmt, *pt;
    DSTATUS stat;
    DWORD bsect, fasize, tsect, sysect, nclst, szbfat, br[4];
    WORD nrsv;
    UINT i;


    ENTER_FF(fs);                       /* Lock the volume */

    mode &= (BYTE)~FA_READ;             /* Desired access mode, write access or not */
    if (fs->fs_type) {                  /* If the volume has been mounted */
        disk_ioctl(fs->drv, IOCTL_STATUS, &stat);
        if (!(stat & STA_NOINIT)) {     /* and the physical drive is kept initialized */
            if (!_FS_READONLY && mode && (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 */
    disk_ioctl(fs->drv, IOCTL_INIT, &stat); /* 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 && mode && (stat & STA_PROTECT)) { /* Check disk write protection if needed */
        return FR_WRITE_PROTECTED;
    }
#if _MAX_SS != _MIN_SS                      /* Get sector size (multiple sector size cfg only) */
    if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK) return FR_DISK_ERR;
    if (SS(fs) > _MAX_SS || SS(fs) < _MIN_SS || (SS(fs) & (SS(fs) - 1))) return FR_DISK_ERR;
#endif
    /* Find an FAT partition on the drive. Supports only generic partitioning, FDISK and SFD. */
    bsect = 0;
    fmt = check_fs(fs, bsect);          /* Load sector 0 and check if it is an FAT-VBR as SFD */
    if (fmt == 2 || (fmt < 2 && LD2PT(fs) != 0)) { /* Not an FAT-VBR or forced partition number */
        for (i = 0; i < 4; i++) {           /* Get partition offset */
            pt = fs->win + (MBR_Table + i * SZ_PTE);
            br[i] = pt[PTE_System] ? ld_dword(pt + PTE_StLba) : 0;
        }
        i = LD2PT(fs);                      /* Partition number: 0:auto, 1-4:forced */
        if (i) i--;
        do {                                /* Find an FAT volume */
            bsect = br[i];
            fmt = bsect ? check_fs(fs, bsect) : 3;  /* Check the partition */
        } while (!LD2PT(fs) && fmt >= 2 && ++i < 4);
    }
    if (fmt == 4) return FR_DISK_ERR;       /* An error occured in the disk I/O layer */
    if (fmt >= 2) return FR_NO_FILESYSTEM;  /* No FAT volume is found */

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

#if _FS_EXFAT
    if (fmt == 1) {
        QWORD maxlba;

        for (i = BPB_ZeroedEx; i < BPB_ZeroedEx + 53 && fs->win[i] == 0; i++) ; /* Check zero filler */
        if (i < BPB_ZeroedEx + 53) return FR_NO_FILESYSTEM;

        if (ld_word(fs->win + BPB_FSVerEx) != 0x100) return FR_NO_FILESYSTEM;   /* Check exFAT revision (Must be 1.0) */

        if (1 << fs->win[BPB_BytsPerSecEx] != SS(fs))   /* (BPB_BytsPerSecEx must be equal to the physical sector size) */
            return FR_NO_FILESYSTEM;

        maxlba = ld_qword(fs->win + BPB_TotSecEx) + bsect;  /* Last LBA + 1 of the volume */
        if (maxlba >= 0x100000000) return FR_NO_FILESYSTEM; /* (It cannot be handled in 32-bit LBA) */

        fs->fsize = ld_dword(fs->win + BPB_FatSzEx);    /* Number of sectors per FAT */

        fs->n_fats = fs->win[BPB_NumFATsEx];            /* Number of FATs */
        if (fs->n_fats != 1) return FR_NO_FILESYSTEM;   /* (Supports only 1 FAT) */

        fs->csize = 1 << fs->win[BPB_SecPerClusEx];     /* Cluster size */
        if (fs->csize == 0) return FR_NO_FILESYSTEM;    /* (Must be 1..32768) */

        nclst = ld_dword(fs->win + BPB_NumClusEx);      /* Number of clusters */
        if (nclst > MAX_EXFAT) return FR_NO_FILESYSTEM; /* (Too many clusters) */
        fs->n_fatent = nclst + 2;

        /* Boundaries and Limits */
        fs->volbase = bsect;
        fs->database = bsect + ld_dword(fs->win + BPB_DataOfsEx);
        fs->fatbase = bsect + ld_dword(fs->win + BPB_FatOfsEx);
        if (maxlba < (QWORD)fs->database + nclst * fs->csize) return FR_NO_FILESYSTEM;  /* (Volume size must not be smaller than the size requiered) */
        fs->dirbase = ld_dword(fs->win + BPB_RootClusEx);

        /* Check if bitmap location is in assumption (at the first cluster) */
        if (move_window(fs, clust2sect(fs, fs->dirbase)) != FR_OK) return FR_DISK_ERR;
        for (i = 0; i < SS(fs); i += SZDIRE) {
            if (fs->win[i] == 0x81 && ld_dword(fs->win + i + 20) == 2) break;   /* 81 entry with cluster #2? */
        }
        if (i == SS(fs)) return FR_NO_FILESYSTEM;
#if !_FS_READONLY
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;     /* Initialize cluster allocation information */
#endif
        fmt = FS_EXFAT;         /* FAT sub-type */
    } else
#endif  /* _FS_EXFAT */
    {
        if (ld_word(fs->win + BPB_BytsPerSec) != SS(fs)) return FR_NO_FILESYSTEM;   /* (BPB_BytsPerSec must be equal to the physical sector size) */

        fasize = ld_word(fs->win + BPB_FATSz16);            /* Number of sectors per FAT */
        if (fasize == 0) fasize = ld_dword(fs->win + BPB_FATSz32);
        fs->fsize = fasize;

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

        fs->csize = fs->win[BPB_SecPerClus];                /* Cluster size */
        if (fs->csize == 0 || (fs->csize & (fs->csize - 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) / SZDIRE)) return FR_NO_FILESYSTEM; /* (Must be sector aligned) */

        tsect = ld_word(fs->win + BPB_TotSec16);            /* Number of sectors on the volume */
        if (tsect == 0) tsect = ld_dword(fs->win + BPB_TotSec32);

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

        /* Determine the FAT sub type */
        sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZDIRE); /* RSV + FAT + DIR */
        if (tsect < sysect) return FR_NO_FILESYSTEM;        /* (Invalid volume size) */
        nclst = (tsect - sysect) / fs->csize;               /* Number of clusters */
        if (nclst == 0) return FR_NO_FILESYSTEM;            /* (Invalid volume size) */
        fmt = FS_FAT32;
        if (nclst <= MAX_FAT16) fmt = FS_FAT16;
        if (nclst <= MAX_FAT12) fmt = FS_FAT12;

        /* Boundaries and Limits */
        fs->n_fatent = nclst + 2;                           /* Number of FAT entries */
        fs->volbase = bsect;                                /* Volume start sector */
        fs->fatbase = bsect + nrsv;                         /* FAT start sector */
        fs->database = bsect + sysect;                      /* Data start sector */
        if (fmt == FS_FAT32) {
            if (ld_word(fs->win + BPB_FSVer32) != 0) return FR_NO_FILESYSTEM;   /* (Must be FAT32 revision 0.0) */
            if (fs->n_rootdir) return FR_NO_FILESYSTEM;     /* (BPB_RootEntCnt must be 0) */
            fs->dirbase = ld_dword(fs->win + BPB_RootClus32);   /* Root directory start cluster */
            szbfat = fs->n_fatent * 4;                      /* (Needed FAT size) */
        } else {
            if (fs->n_rootdir == 0) return FR_NO_FILESYSTEM;/* (BPB_RootEntCnt must not be 0) */
            fs->dirbase = fs->fatbase + fasize;             /* Root directory start sector */
            szbfat = (fmt == FS_FAT16) ?                    /* (Needed FAT size) */
                fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
        }
        if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs)) return FR_NO_FILESYSTEM;  /* (BPB_FATSz must not be less than the size needed) */

#if !_FS_READONLY
        /* Get FSINFO if available */
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;     /* Initialize cluster allocation information */
        fs->fsi_flag = 0x80;
#if (_FS_NOFSINFO & 3) != 3
        if (fmt == FS_FAT32             /* Enable FSINFO only if FAT32 and BPB_FSInfo32 == 1 */
            && ld_word(fs->win + BPB_FSInfo32) == 1
            && move_window(fs, bsect + 1) == FR_OK)
        {
            fs->fsi_flag = 0;
            if (ld_word(fs->win + BS_55AA) == 0xAA55    /* Load FSINFO data if available */
                && ld_dword(fs->win + FSI_LeadSig) == 0x41615252
                && ld_dword(fs->win + FSI_StrucSig) == 0x61417272)
            {
#if (_FS_NOFSINFO & 1) == 0
                fs->free_clst = ld_dword(fs->win + FSI_Free_Count);
#endif
#if (_FS_NOFSINFO & 2) == 0
                fs->last_clst = ld_dword(fs->win + FSI_Nxt_Free);
#endif
            }
        }
#endif  /* (_FS_NOFSINFO & 3) != 3 */
#endif  /* !_FS_READONLY */
    }

    fs->fs_type = fmt;  /* FAT sub-type */
    fs->id = ++Fsid;    /* File system mount ID */
#if _USE_LFN == 1
    fs->lfnbuf = LfnBuf;    /* Static LFN working buffer */
#if _FS_EXFAT
    fs->dirbuf = DirBuf;    /* Static directory block working buuffer */
#endif
#endif
#if _FS_RPATH != 0
    fs->cdir = 0;       /* Initialize current directory */
#endif
#if _FS_LOCK != 0       /* Clear file lock semaphores */
    clear_lock(fs);
#endif
    return FR_OK;
}




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

static
FRESULT validate (  /* Returns FR_OK or FR_INVALID_OBJECT */
    _FDID* obj,     /* Pointer to the _OBJ, the 1st member in the FIL/DIR object, to check validity */
    FATFS** fs      /* Pointer to pointer to the owner file system object to return */
)
{
    FRESULT res;
    DSTATUS stat;


    if (!obj || !obj->fs || !obj->fs->fs_type || obj->fs->id != obj->id || disk_ioctl(obj->fs->drv, IOCTL_STATUS, &stat) != RES_OK || (stat & STA_NOINIT)) {
        *fs = 0;                /* The object is invalid */
        res = FR_INVALID_OBJECT;
    } else {
        *fs = obj->fs;          /* Owner file sytem object */
        ENTER_FF(obj->fs);      /* Lock file system */
        res = FR_OK;
    }
    return res;
}




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

   Public Functions (FatFs API)

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



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

FRESULT f_mount (
    FATFS* fs           /* Pointer to the file system object to mount */
)
{
    FRESULT res;

    fs->fs_type = 0;                    /* Clear new fs object */
#if _FS_REENTRANT                       /* Create sync object for the new volume */
    if (!ff_cre_syncobj(fs, &fs->sobj)) return FR_INT_ERR;
#endif

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


FRESULT f_umount (
    FATFS* fs                   /* Pointer to the file system object to unmount */
)
{
#if _FS_LOCK
    clear_lock(fs);
#endif
#if _FS_REENTRANT               /* Discard sync object of the current volume */
    if (!ff_del_syncobj(fs->sobj)) return FR_INT_ERR;
#endif
    fs->fs_type = 0;            /* Clear old fs object */

    return FR_OK;
}


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

FRESULT f_open (
    FATFS *fs,
    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;
#if !_FS_READONLY
    DWORD dw, cl, bcs, clst, sc;
    FSIZE_t ofs;
#endif
    DEF_NAMBUF


    if (!fp) return FR_INVALID_OBJECT;

    /* Get logical drive */
    mode &= _FS_READONLY ? FA_READ : FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_CREATE_NEW | FA_OPEN_ALWAYS | FA_OPEN_APPEND | FA_SEEKEND;
    res = find_volume(fs, mode);
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);   /* Follow the file path */
#if !_FS_READONLY   /* R/W configuration */
        if (res == FR_OK) {
            if (dj.fn[NSFLAG] & NS_NONAME) {    /* Origin directory itself? */
                res = FR_INVALID_NAME;
            }
#if _FS_LOCK != 0
            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)) {
            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 != 0
                    res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
                    res = dir_register(&dj);
#endif
                mode |= FA_CREATE_ALWAYS;       /* File is created */
            }
            else {                              /* Any object is already existing */
                if (dj.obj.attr & (AM_RDO | AM_DIR)) {  /* Cannot overwrite it (R/O or DIR) */
                    res = FR_DENIED;
                } else {
                    if (mode & FA_CREATE_NEW) res = FR_EXIST;   /* Cannot create as new file */
                }
            }
            if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {    /* Truncate it if overwrite mode */
                dw = GET_FATTIME();
#if _FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {
                    /* Get current allocation info */
                    fp->obj.fs = fs;
                    fp->obj.sclust = ld_dword(fs->dirbuf + XDIR_FstClus);
                    fp->obj.objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
                    fp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
                    /* Initialize directory entry block */
                    st_dword(fs->dirbuf + XDIR_CrtTime, dw);    /* Set created time */
                    fs->dirbuf[XDIR_CrtTime10] = 0;
                    st_dword(fs->dirbuf + XDIR_ModTime, dw);    /* Set modified time */
                    fs->dirbuf[XDIR_ModTime10] = 0;
                    fs->dirbuf[XDIR_Attr] = AM_ARC;             /* Reset attribute */
                    st_dword(fs->dirbuf + XDIR_FstClus, 0);     /* Reset file allocation info */
                    st_qword(fs->dirbuf + XDIR_FileSize, 0);
                    st_qword(fs->dirbuf + XDIR_ValidFileSize, 0);
                    fs->dirbuf[XDIR_GenFlags] = 1;
                    res = store_xdir(&dj);
                    if (res == FR_OK && fp->obj.sclust) {       /* Remove the cluster chain if exist */
                        res = remove_chain(&fp->obj, fp->obj.sclust, 0);
                        fs->last_clst = fp->obj.sclust - 1;     /* Reuse the cluster hole */
                    }
                } else
#endif
                {
                    /* Clean directory info */
                    st_dword(dj.dir + DIR_CrtTime, dw); /* Set created time */
                    st_dword(dj.dir + DIR_ModTime, dw); /* Set modified time */
                    dj.dir[DIR_Attr] = AM_ARC;          /* Reset attribute */
                    cl = ld_clust(fs, dj.dir);          /* Get cluster chain */
                    st_clust(fs, dj.dir, 0);            /* Reset file allocation info */
                    st_dword(dj.dir + DIR_FileSize, 0);
                    fs->wflag = 1;

                    if (cl) {                           /* Remove the cluster chain if exist */
                        dw = fs->winsect;
                        res = remove_chain(&dj.obj, cl, 0);
                        if (res == FR_OK) {
                            res = move_window(fs, dw);
                            fs->last_clst = cl - 1;     /* Reuse the cluster hole */
                        }
                    }
                }
            }
        }
        else {  /* Open an existing file */
            if (res == FR_OK) {                 /* Following succeeded */
                if (dj.obj.attr & AM_DIR) {     /* It is a directory */
                    res = FR_NO_FILE;
                } else {
                    if ((mode & FA_WRITE) && (dj.obj.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_MODIFIED;
            fp->dir_sect = fs->winsect;         /* Pointer to the directory entry */
            fp->dir_ptr = dj.dir;
#if _FS_LOCK != 0
            fp->obj.lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
            if (!fp->obj.lockid) res = FR_INT_ERR;
#endif
        }
#else       /* R/O configuration */
        if (res == FR_OK) {
            if (dj.fn[NSFLAG] & NS_NONAME) {    /* Origin directory itself? */
                res = FR_INVALID_NAME;
            } else {
                if (dj.obj.attr & AM_DIR) {     /* It is a directory */
                    res = FR_NO_FILE;
                }
            }
        }
#endif

        if (res == FR_OK) {
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                fp->obj.sclust = ld_dword(fs->dirbuf + XDIR_FstClus);       /* Get allocation info */
                fp->obj.objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
                fp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
                fp->obj.c_scl = dj.obj.sclust;
                fp->obj.c_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
                fp->obj.c_ofs = dj.blk_ofs;
            } else
#endif
            {
                fp->obj.sclust = ld_clust(fs, dj.dir);              /* Get allocation info */
                fp->obj.objsize = ld_dword(dj.dir + DIR_FileSize);
            }
#if _USE_FASTSEEK
            fp->cltbl = 0;          /* Disable fast seek mode */
#endif
            fp->obj.fs = fs;        /* Validate the file object */
            fp->obj.id = fs->id;
            fp->flag = mode;        /* Set file access mode */
            fp->err = 0;            /* Clear error flag */
            fp->sect = 0;           /* Invalidate current data sector */
            fp->fptr = 0;           /* Set file pointer top of the file */
#if !_FS_READONLY
#if !_FS_TINY
            mem_set(fp->buf, 0, _MAX_SS);   /* Clear sector buffer */
#endif
            if ((mode & FA_SEEKEND) && fp->obj.objsize > 0) {   /* Seek to end of file if FA_OPEN_APPEND is specified */
                fp->fptr = fp->obj.objsize;         /* Offset to seek */
                bcs = (DWORD)fs->csize * SS(fs);    /* Cluster size in byte */
                clst = fp->obj.sclust;              /* Follow the cluster chain */
                for (ofs = fp->obj.objsize; res == FR_OK && ofs > bcs; ofs -= bcs) {
                    clst = get_fat(&fp->obj, clst);
                    if (clst <= 1) res = FR_INT_ERR;
                    if (clst == 0xFFFFFFFF) res = FR_DISK_ERR;
                }
                fp->clust = clst;
                if (res == FR_OK && ofs % SS(fs)) { /* Fill sector buffer if not on the sector boundary */
                    if ((sc = clust2sect(fs, clst)) == 0) {
                        res = FR_INT_ERR;
                    } else {
                        fp->sect = sc + (DWORD)(ofs / SS(fs));
#if !_FS_TINY
                        if (disk_read(fs->drv, fp->buf, fp->sect, 1) != RES_OK) res = FR_DISK_ERR;
#endif
                    }
                }
            }
#endif
        }

        FREE_NAMBUF();
    }

    if (res != FR_OK) fp->obj.fs = 0;   /* Invalidate file object on error */

    LEAVE_FF(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;
    FATFS *fs;
    DWORD clst, sect;
    FSIZE_t remain;
    UINT rcnt, cc, csect;
    BYTE *rbuff = (BYTE*)buff;


    *br = 0;    /* Clear read byte counter */
    res = validate(&fp->obj, &fs);              /* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);   /* Check validity */
    if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED); /* Check access mode */
    remain = fp->obj.objsize - 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(fs) == 0) {           /* On the sector boundary? */
            csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));    /* Sector offset in the cluster */
            if (csect == 0) {                   /* On the cluster boundary? */
                if (fp->fptr == 0) {            /* On the top of the file? */
                    clst = fp->obj.sclust;      /* Follow cluster chain 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->obj, fp->clust);    /* Follow cluster chain on the FAT */
                    }
                }
                if (clst < 2) ABORT(fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                fp->clust = clst;               /* Update current cluster */
            }
            sect = clust2sect(fs, fp->clust);   /* Get current sector */
            if (!sect) ABORT(fs, FR_INT_ERR);
            sect += csect;
            cc = btr / SS(fs);                  /* When remaining bytes >= sector size, */
            if (cc) {                           /* Read maximum contiguous sectors directly */
                if (csect + cc > fs->csize) {   /* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if (disk_read(fs->drv, rbuff, sect, cc) != RES_OK) ABORT(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 (fs->wflag && fs->winsect - sect < cc) {
                    mem_cpy(rbuff + ((fs->winsect - sect) * SS(fs)), fs->win, SS(fs));
                }
#else
                if ((fp->flag & FA_DIRTY) && fp->sect - sect < cc) {
                    mem_cpy(rbuff + ((fp->sect - sect) * SS(fs)), fp->buf, SS(fs));
                }
#endif
#endif
                rcnt = SS(fs) * cc;             /* Number of bytes transferred */
                continue;
            }
#if !_FS_TINY
            if (fp->sect != sect) {         /* Load data sector if not in cache */
#if !_FS_READONLY
                if (fp->flag & FA_DIRTY) {      /* Write-back dirty sector cache */
                    if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                    fp->flag &= (BYTE)~FA_DIRTY;
                }
#endif
                if (disk_read(fs->drv, fp->buf, sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR); /* Fill sector cache */
            }
#endif
            fp->sect = sect;
        }
        rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);    /* Number of bytes left in the sector */
        if (rcnt > btr) rcnt = btr;                 /* Clip it by btr if needed */
#if _FS_TINY
        if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR); /* Move sector window */
        mem_cpy(rbuff, fs->win + fp->fptr % SS(fs), rcnt);  /* Extract partial sector */
#else
        mem_cpy(rbuff, fp->buf + fp->fptr % SS(fs), rcnt);  /* Extract partial sector */
#endif
    }

    LEAVE_FF(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;
    FATFS *fs;
    DWORD clst, sect;
    UINT wcnt, cc, csect;
    const BYTE *wbuff = (const BYTE*)buff;


    *bw = 0;    /* Clear write byte counter */
    res = validate(&fp->obj, &fs);          /* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);   /* Check validity */
    if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);    /* Check access mode */

    /* Check fptr wrap-around (file size cannot reach 4GiB on FATxx) */
    if ((!_FS_EXFAT || fs->fs_type != FS_EXFAT) && (DWORD)(fp->fptr + btw) < (DWORD)fp->fptr) {
        btw = (UINT)(0xFFFFFFFF - (DWORD)fp->fptr);
    }

    for ( ;  btw;                           /* Repeat until all data written */
        wbuff += wcnt, fp->fptr += wcnt, fp->obj.objsize = (fp->fptr > fp->obj.objsize) ? fp->fptr : fp->obj.objsize, *bw += wcnt, btw -= wcnt) {
        if (fp->fptr % SS(fs) == 0) {       /* On the sector boundary? */
            csect = (UINT)(fp->fptr / SS(fs)) & (fs->csize - 1);    /* Sector offset in the cluster */
            if (csect == 0) {               /* On the cluster boundary? */
                if (fp->fptr == 0) {        /* On the top of the file? */
                    clst = fp->obj.sclust;  /* Follow from the origin */
                    if (clst == 0) {        /* If no cluster is allocated, */
                        clst = create_chain(&fp->obj, 0);   /* create a new cluster chain */
                    }
                } else {                    /* On the 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->obj, 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(fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                fp->clust = clst;           /* Update current cluster */
                if (fp->obj.sclust == 0) fp->obj.sclust = clst; /* Set start cluster if the first write */
            }
#if _FS_TINY
            if (fs->winsect == fp->sect && sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);    /* Write-back sector cache */
#else
            if (fp->flag & FA_DIRTY) {      /* Write-back sector cache */
                if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            sect = clust2sect(fs, fp->clust);   /* Get current sector */
            if (!sect) ABORT(fs, FR_INT_ERR);
            sect += csect;
            cc = btw / SS(fs);              /* When remaining bytes >= sector size, */
            if (cc) {                       /* Write maximum contiguous sectors directly */
                if (csect + cc > fs->csize) {   /* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if (disk_write(fs->drv, wbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if _FS_MINIMIZE <= 2
#if _FS_TINY
                if (fs->winsect - sect < cc) {  /* Refill sector cache if it gets invalidated by the direct write */
                    mem_cpy(fs->win, wbuff + ((fs->winsect - sect) * SS(fs)), SS(fs));
                    fs->wflag = 0;
                }
#else
                if (fp->sect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
                    mem_cpy(fp->buf, wbuff + ((fp->sect - sect) * SS(fs)), SS(fs));
                    fp->flag &= (BYTE)~FA_DIRTY;