/*----------------------------------------------------------------------------/
/  FatFs - Generic FAT Filesystem Module  R0.14a                              /
/-----------------------------------------------------------------------------/
/
/ Copyright (C) 2020, 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 "ff.h"			/* Declarations of FatFs API */
#include "diskio.h"		/* Declarations of device I/O functions */


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

   Module Private Definitions

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

#if FF_DEFINED != 80196	/* Revision ID */
#error Wrong include file (ff.h).
#endif


/* Limits and boundaries */
#define MAX_DIR		0x200000		/* Max size of FAT directory */
#define MAX_DIR_EX	0x10000000		/* Max size of exFAT directory */
#define MAX_FAT12	0xFF5			/* Max FAT12 clusters (differs from specs, but right for real DOS/Windows behavior) */
#define MAX_FAT16	0xFFF5			/* Max FAT16 clusters (differs from specs, but right for real DOS/Windows behavior) */
#define MAX_FAT32	0x0FFFFFF5		/* Max FAT32 clusters (not specified, practical limit) */
#define MAX_EXFAT	0x7FFFFFFD		/* Max exFAT clusters (differs from specs, implementation limit) */


/* 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')
#define IsSurrogate(c)	((c) >= 0xD800 && (c) <= 0xDFFF)
#define IsSurrogateH(c)	((c) >= 0xD800 && (c) <= 0xDBFF)
#define IsSurrogateL(c)	((c) >= 0xDC00 && (c) <= 0xDFFF)


/* Additional file access control and file status flags for 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 */


/* Additional file attribute bits for internal use */
#define AM_VOL		0x08	/* Volume label */
#define AM_LFN		0x0F	/* LFN entry */
#define AM_MASK		0x3F	/* Mask of defined bits */


/* Name status flags in fn[11] */
#define NSFLAG		11		/* Index of the name status byte */
#define NS_LOSS		0x01	/* Out of 8.3 format */
#define NS_LFN		0x02	/* Force to create LFN entry */
#define NS_LAST		0x04	/* Last segment */
#define NS_BODY		0x08	/* Lower case flag (body) */
#define NS_EXT		0x10	/* Lower case flag (ext) */
#define NS_DOT		0x20	/* Dot entry */
#define NS_NOLFN	0x40	/* Do not find LFN */
#define NS_NONAME	0x80	/* Not followed */


/* exFAT directory entry types */
#define	ET_BITMAP	0x81	/* Allocation bitmap */
#define	ET_UPCASE	0x82	/* Up-case table */
#define	ET_VLABEL	0x83	/* Volume label */
#define	ET_FILEDIR	0x85	/* File and directory */
#define	ET_STREAM	0xC0	/* Stream extension */
#define	ET_FILENAME	0xC1	/* Name extension */


/* FatFs refers the FAT structure as simple byte array instead of structure member
/ because the C 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 FAT [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		/* Number of sectors per track 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		/* WindowsNT 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		/* Filesystem 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: Filesystem 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: Filesystem 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 start cluster (DWORD) */
#define BPB_VolIDEx			100		/* exFAT: Volume serial number (DWORD) */
#define BPB_FSVerEx			104		/* exFAT: Filesystem version (WORD) */
#define BPB_VolFlagEx		106		/* exFAT: Volume flags (WORD) */
#define BPB_BytsPerSecEx	108		/* exFAT: Log2 of sector size in unit of byte (BYTE) */
#define BPB_SecPerClusEx	109		/* exFAT: Log2 of cluster size in unit of 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 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: LFN order and LLE flag (BYTE) */
#define LDIR_Attr			11		/* LFN: LFN attribute (BYTE) */
#define LDIR_Type			12		/* LFN: Entry type (BYTE) */
#define LDIR_Chksum			13		/* LFN: Checksum of the SFN (BYTE) */
#define LDIR_FstClusLO		26		/* LFN: MBZ field (WORD) */
#define XDIR_Type			0		/* exFAT: Type of exFAT directory entry (BYTE) */
#define XDIR_NumLabel		1		/* exFAT: Number of volume label characters (BYTE) */
#define XDIR_Label			2		/* exFAT: Volume label (11-WORD) */
#define XDIR_CaseSum		4		/* exFAT: Sum of case conversion table (DWORD) */
#define XDIR_NumSec			1		/* exFAT: Number of secondary entries (BYTE) */
#define XDIR_SetSum			2		/* exFAT: Sum of the set of directory entries (WORD) */
#define XDIR_Attr			4		/* exFAT: File attribute (WORD) */
#define XDIR_CrtTime		8		/* exFAT: Created time (DWORD) */
#define XDIR_ModTime		12		/* exFAT: Modified time (DWORD) */
#define XDIR_AccTime		16		/* exFAT: Last accessed time (DWORD) */
#define XDIR_CrtTime10		20		/* exFAT: Created time subsecond (BYTE) */
#define XDIR_ModTime10		21		/* exFAT: Modified time subsecond (BYTE) */
#define XDIR_CrtTZ			22		/* exFAT: Created timezone (BYTE) */
#define XDIR_ModTZ			23		/* exFAT: Modified timezone (BYTE) */
#define XDIR_AccTZ			24		/* exFAT: Last accessed timezone (BYTE) */
#define XDIR_GenFlags		33		/* exFAT: General secondary flags (BYTE) */
#define XDIR_NumName		35		/* exFAT: Number of file name characters (BYTE) */
#define XDIR_NameHash		36		/* exFAT: Hash of file name (WORD) */
#define XDIR_ValidFileSize	40		/* exFAT: Valid file size (QWORD) */
#define XDIR_FstClus		52		/* exFAT: First cluster of the file data (DWORD) */
#define XDIR_FileSize		56		/* exFAT: File/Directory size (QWORD) */

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

#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 GPTH_Sign			0		/* GPT: Header signature (8-byte) */
#define GPTH_Rev			8		/* GPT: Revision (DWORD) */
#define GPTH_Size			12		/* GPT: Header size (DWORD) */
#define GPTH_Bcc			16		/* GPT: Header BCC (DWORD) */
#define GPTH_CurLba			24		/* GPT: Main header LBA (QWORD) */
#define GPTH_BakLba			32		/* GPT: Backup header LBA (QWORD) */
#define GPTH_FstLba			40		/* GPT: First LBA for partitions (QWORD) */
#define GPTH_LstLba			48		/* GPT: Last LBA for partitions (QWORD) */
#define GPTH_DskGuid		56		/* GPT: Disk GUID (16-byte) */
#define GPTH_PtOfs			72		/* GPT: Partation table LBA (QWORD) */
#define GPTH_PtNum			80		/* GPT: Number of table entries (DWORD) */
#define GPTH_PteSize		84		/* GPT: Size of table entry (DWORD) */
#define GPTH_PtBcc			88		/* GPT: Partation table BCC (DWORD) */
#define SZ_GPTE				128		/* GPT: Size of partition table entry */
#define GPTE_PtGuid			0		/* GPT PTE: Partition type GUID (16-byte) */
#define GPTE_UpGuid			16		/* GPT PTE: Partition unique GUID (16-byte) */
#define GPTE_FstLba			32		/* GPT PTE: First LBA (QWORD) */
#define GPTE_LstLba			40		/* GPT PTE: Last LBA inclusive (QWORD) */
#define GPTE_Flags			48		/* GPT PTE: Flags (QWORD) */
#define GPTE_Name			56		/* GPT PTE: Name */


/* Post process on fatal error in the file operations */
#define ABORT(fs, res)		{ fp->err = (BYTE)(res); LEAVE_FF(fs, res); }


/* Re-entrancy related */
#if FF_FS_REENTRANT
#if FF_USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration
#endif
#define LEAVE_FF(fs, res)	{ unlock_fs(fs, res); return res; }
#else
#define LEAVE_FF(fs, res)	return res
#endif


/* Definitions of logical drive - physical location conversion */
#if FF_MULTI_PARTITION
#define LD2PD(vol) VolToPart[vol].pd	/* Get physical drive number */
#define LD2PT(vol) VolToPart[vol].pt	/* Get partition index */
#else
#define LD2PD(vol) (BYTE)(vol)	/* Each logical drive is associated with the same physical drive number */
#define LD2PT(vol) 0			/* Find first valid partition or in SFD */
#endif


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


/* Timestamp */
#if FF_FS_NORTC == 1
#if FF_NORTC_YEAR < 1980 || FF_NORTC_YEAR > 2107 || FF_NORTC_MON < 1 || FF_NORTC_MON > 12 || FF_NORTC_MDAY < 1 || FF_NORTC_MDAY > 31
#error Invalid FF_FS_NORTC settings
#endif
#define GET_FATTIME()	((DWORD)(FF_NORTC_YEAR - 1980) << 25 | (DWORD)FF_NORTC_MON << 21 | (DWORD)FF_NORTC_MDAY << 16)
#else
#define GET_FATTIME()	get_fattime()
#endif


/* File lock controls */
#if FF_FS_LOCK != 0
#if FF_FS_READONLY
#error FF_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, containing directory (0:root) */
    DWORD ofs;		/* Object ID 3, offset in the directory */
    WORD ctr;		/* Object open counter, 0:none, 0x01..0xFF:read mode open count, 0x100:write mode */
} FILESEM;
#endif


/* SBCS up-case tables (\x80-\xFF) */
#define TBL_CT437  {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}
#define TBL_CT720  {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}
#define TBL_CT737  {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}
#define TBL_CT771  {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}
#define TBL_CT775  {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}
#define TBL_CT850  {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}
#define TBL_CT852  {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}
#define TBL_CT855  {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}
#define TBL_CT857  {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}
#define TBL_CT860  {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}
#define TBL_CT861  {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}
#define TBL_CT862  {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}
#define TBL_CT863  {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}
#define TBL_CT864  {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}
#define TBL_CT865  {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}
#define TBL_CT866  {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}
#define TBL_CT869  {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}


/* DBCS code range |----- 1st byte -----|  |----------- 2nd byte -----------| */
/*                  <------>    <------>    <------>    <------>    <------>  */
#define TBL_DC932 {0x81, 0x9F, 0xE0, 0xFC, 0x40, 0x7E, 0x80, 0xFC, 0x00, 0x00}
#define TBL_DC936 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0x80, 0xFE, 0x00, 0x00}
#define TBL_DC949 {0x81, 0xFE, 0x00, 0x00, 0x41, 0x5A, 0x61, 0x7A, 0x81, 0xFE}
#define TBL_DC950 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0xA1, 0xFE, 0x00, 0x00}


/* Macros for table definitions */
#define MERGE_2STR(a, b) a ## b
#define MKCVTBL(hd, cp) MERGE_2STR(hd, cp)




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

   Module Private Work Area

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

/*--------------------------------*/
/* File/Volume controls           */
/*--------------------------------*/

#if FF_VOLUMES < 1 || FF_VOLUMES > 10
#error Wrong FF_VOLUMES setting
#endif
static FATFS* FatFs[FF_VOLUMES];	/* Pointer to the filesystem objects (logical drives) */
static WORD Fsid;					/* Filesystem mount ID */

#if FF_FS_RPATH != 0
static BYTE CurrVol;				/* Current drive */
#endif

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

#if FF_STR_VOLUME_ID
#ifdef FF_VOLUME_STRS
static const char* const VolumeStr[FF_VOLUMES] = {FF_VOLUME_STRS};	/* Pre-defined volume ID */
#endif
#endif

#if FF_LBA64
#if FF_MIN_GPT > 0x100000000
#error Wrong FF_MIN_GPT setting
#endif
static const BYTE GUID_MS_Basic[16] = {0xA2,0xA0,0xD0,0xEB,0xE5,0xB9,0x33,0x44,0x87,0xC0,0x68,0xB6,0xB7,0x26,0x99,0xC7};
#endif



/*--------------------------------*/
/* LFN/Directory working buffer   */
/*--------------------------------*/

#if FF_USE_LFN == 0		/* Non-LFN configuration */
#if FF_FS_EXFAT
#error LFN must be enabled when enable exFAT
#endif
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
#define LEAVE_MKFS(res)	return res

#else					/* LFN configurations */
#if FF_MAX_LFN < 12 || FF_MAX_LFN > 255
#error Wrong setting of FF_MAX_LFN
#endif
#if FF_LFN_BUF < FF_SFN_BUF || FF_SFN_BUF < 12
#error Wrong setting of FF_LFN_BUF or FF_SFN_BUF
#endif
#if FF_LFN_UNICODE < 0 || FF_LFN_UNICODE > 3
#error Wrong setting of FF_LFN_UNICODE
#endif
static const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};	/* FAT: Offset of LFN characters in the directory entry */
#define MAXDIRB(nc)	((nc + 44U) / 15 * SZDIRE)	/* exFAT: Size of directory entry block scratchpad buffer needed for the name length */

#if FF_USE_LFN == 1		/* LFN enabled with static working buffer */
#if FF_FS_EXFAT
static BYTE	DirBuf[MAXDIRB(FF_MAX_LFN)];	/* Directory entry block scratchpad buffer */
#endif
static WCHAR LfnBuf[FF_MAX_LFN + 1];		/* LFN working buffer */
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
#define LEAVE_MKFS(res)	return res

#elif FF_USE_LFN == 2 	/* LFN enabled with dynamic working buffer on the stack */
#if FF_FS_EXFAT
#define DEF_NAMBUF		WCHAR lbuf[FF_MAX_LFN+1]; BYTE dbuf[MAXDIRB(FF_MAX_LFN)];	/* LFN working buffer and directory entry block scratchpad buffer */
#define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; (fs)->dirbuf = dbuf; }
#define FREE_NAMBUF()
#else
#define DEF_NAMBUF		WCHAR lbuf[FF_MAX_LFN+1];	/* LFN working buffer */
#define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; }
#define FREE_NAMBUF()
#endif
#define LEAVE_MKFS(res)	return res

#elif FF_USE_LFN == 3 	/* LFN enabled with dynamic working buffer on the heap */
#if FF_FS_EXFAT
#define DEF_NAMBUF		WCHAR *lfn;	/* Pointer to LFN working buffer and directory entry block scratchpad buffer */
#define INIT_NAMBUF(fs)	{ lfn = ff_memalloc((FF_MAX_LFN+1)*2 + MAXDIRB(FF_MAX_LFN)); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; (fs)->dirbuf = (BYTE*)(lfn+FF_MAX_LFN+1); }
#define FREE_NAMBUF()	ff_memfree(lfn)
#else
#define DEF_NAMBUF		WCHAR *lfn;	/* Pointer to LFN working buffer */
#define INIT_NAMBUF(fs)	{ lfn = ff_memalloc((FF_MAX_LFN+1)*2); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; }
#define FREE_NAMBUF()	ff_memfree(lfn)
#endif
#define LEAVE_MKFS(res)	{ if (!work) ff_memfree(buf); return res; }
#define MAX_MALLOC	0x8000	/* Must be >=FF_MAX_SS */

#else
#error Wrong setting of FF_USE_LFN

#endif	/* FF_USE_LFN == 1 */
#endif	/* FF_USE_LFN == 0 */



/*--------------------------------*/
/* Code conversion tables         */
/*--------------------------------*/

#if FF_CODE_PAGE == 0		/* Run-time code page configuration */
#define CODEPAGE CodePage
static WORD CodePage;	/* Current code page */
static const BYTE *ExCvt, *DbcTbl;	/* Pointer to current SBCS up-case table and DBCS code range table below */

static const BYTE Ct437[] = TBL_CT437;
static const BYTE Ct720[] = TBL_CT720;
static const BYTE Ct737[] = TBL_CT737;
static const BYTE Ct771[] = TBL_CT771;
static const BYTE Ct775[] = TBL_CT775;
static const BYTE Ct850[] = TBL_CT850;
static const BYTE Ct852[] = TBL_CT852;
static const BYTE Ct855[] = TBL_CT855;
static const BYTE Ct857[] = TBL_CT857;
static const BYTE Ct860[] = TBL_CT860;
static const BYTE Ct861[] = TBL_CT861;
static const BYTE Ct862[] = TBL_CT862;
static const BYTE Ct863[] = TBL_CT863;
static const BYTE Ct864[] = TBL_CT864;
static const BYTE Ct865[] = TBL_CT865;
static const BYTE Ct866[] = TBL_CT866;
static const BYTE Ct869[] = TBL_CT869;
static const BYTE Dc932[] = TBL_DC932;
static const BYTE Dc936[] = TBL_DC936;
static const BYTE Dc949[] = TBL_DC949;
static const BYTE Dc950[] = TBL_DC950;

#elif FF_CODE_PAGE < 900	/* Static code page configuration (SBCS) */
#define CODEPAGE FF_CODE_PAGE
static const BYTE ExCvt[] = MKCVTBL(TBL_CT, FF_CODE_PAGE);

#else					/* Static code page configuration (DBCS) */
#define CODEPAGE FF_CODE_PAGE
static const BYTE DbcTbl[] = MKCVTBL(TBL_DC, FF_CODE_PAGE);

#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 FF_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 !FF_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 FF_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	/* !FF_FS_READONLY */



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

/* Copy memory to memory */
static void mem_cpy (void* dst, const void* src, UINT cnt)
{
    BYTE *d = (BYTE*)dst;
    const BYTE *s = (const BYTE*)src;

    if (cnt != 0) {
        do {
            *d++ = *s++;
        } while (--cnt);
    }
}


/* Fill memory block */
static void mem_set (void* dst, int val, UINT cnt)
{
    BYTE *d = (BYTE*)dst;

    do {
        *d++ = (BYTE)val;
    } while (--cnt);
}


/* Compare memory block */
static int mem_cmp (const void* dst, const void* src, UINT cnt)	/* ZR:same, NZ:different */
{
    const BYTE *d = (const BYTE *)dst, *s = (const BYTE *)src;
    int r = 0;

    do {
        r = *d++ - *s++;
    } while (--cnt && r == 0);

    return r;
}


/* 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;
}


/* Test if the byte is DBC 1st byte */
static int dbc_1st (BYTE c)
{
#if FF_CODE_PAGE == 0		/* Variable code page */
    if (DbcTbl && c >= DbcTbl[0]) {
        if (c <= DbcTbl[1]) return 1;					/* 1st byte range 1 */
        if (c >= DbcTbl[2] && c <= DbcTbl[3]) return 1;	/* 1st byte range 2 */
    }
#elif FF_CODE_PAGE >= 900	/* DBCS fixed code page */
    if (c >= DbcTbl[0]) {
        if (c <= DbcTbl[1]) return 1;
        if (c >= DbcTbl[2] && c <= DbcTbl[3]) return 1;
    }
#else						/* SBCS fixed code page */
    if (c != 0) return 0;	/* Always false */
#endif
    return 0;
}


/* Test if the byte is DBC 2nd byte */
static int dbc_2nd (BYTE c)
{
#if FF_CODE_PAGE == 0		/* Variable code page */
    if (DbcTbl && c >= DbcTbl[4]) {
        if (c <= DbcTbl[5]) return 1;					/* 2nd byte range 1 */
        if (c >= DbcTbl[6] && c <= DbcTbl[7]) return 1;	/* 2nd byte range 2 */
        if (c >= DbcTbl[8] && c <= DbcTbl[9]) return 1;	/* 2nd byte range 3 */
    }
#elif FF_CODE_PAGE >= 900	/* DBCS fixed code page */
    if (c >= DbcTbl[4]) {
        if (c <= DbcTbl[5]) return 1;
        if (c >= DbcTbl[6] && c <= DbcTbl[7]) return 1;
        if (c >= DbcTbl[8] && c <= DbcTbl[9]) return 1;
    }
#else						/* SBCS fixed code page */
    if (c != 0) return 0;	/* Always false */
#endif
    return 0;
}


#if FF_USE_LFN

/* Get a Unicode code point from the TCHAR string in defined API encodeing */
static DWORD tchar2uni (	/* Returns a character in UTF-16 encoding (>=0x10000 on surrogate pair, 0xFFFFFFFF on decode error) */
    const TCHAR** str		/* Pointer to pointer to TCHAR string in configured encoding */
)
{
    DWORD uc;
    const TCHAR *p = *str;

#if FF_LFN_UNICODE == 1		/* UTF-16 input */
    WCHAR wc;

    uc = *p++;	/* Get a unit */
    if (IsSurrogate(uc)) {	/* Surrogate? */
        wc = *p++;		/* Get low surrogate */
        if (!IsSurrogateH(uc) || !IsSurrogateL(wc)) return 0xFFFFFFFF;	/* Wrong surrogate? */
        uc = uc << 16 | wc;
    }

#elif FF_LFN_UNICODE == 2	/* UTF-8 input */
    BYTE b;
    int nf;

    uc = (BYTE)*p++;	/* Get an encoding unit */
    if (uc & 0x80) {	/* Multiple byte code? */
        if ((uc & 0xE0) == 0xC0) {	/* 2-byte sequence? */
            uc &= 0x1F; nf = 1;
        } else {
            if ((uc & 0xF0) == 0xE0) {	/* 3-byte sequence? */
                uc &= 0x0F; nf = 2;
            } else {
                if ((uc & 0xF8) == 0xF0) {	/* 4-byte sequence? */
                    uc &= 0x07; nf = 3;
                } else {					/* Wrong sequence */
                    return 0xFFFFFFFF;
                }
            }
        }
        do {	/* Get trailing bytes */
            b = (BYTE)*p++;
            if ((b & 0xC0) != 0x80) return 0xFFFFFFFF;	/* Wrong sequence? */
            uc = uc << 6 | (b & 0x3F);
        } while (--nf != 0);
        if (uc < 0x80 || IsSurrogate(uc) || uc >= 0x110000) return 0xFFFFFFFF;	/* Wrong code? */
        if (uc >= 0x010000) uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF);	/* Make a surrogate pair if needed */
    }

#elif FF_LFN_UNICODE == 3	/* UTF-32 input */
    uc = (TCHAR)*p++;	/* Get a unit */
    if (uc >= 0x110000 || IsSurrogate(uc)) return 0xFFFFFFFF;	/* Wrong code? */
    if (uc >= 0x010000) uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF);	/* Make a surrogate pair if needed */

#else		/* ANSI/OEM input */
    BYTE b;
    WCHAR wc;

    wc = (BYTE)*p++;			/* Get a byte */
    if (dbc_1st((BYTE)wc)) {	/* Is it a DBC 1st byte? */
        b = (BYTE)*p++;			/* Get 2nd byte */
        if (!dbc_2nd(b)) return 0xFFFFFFFF;	/* Invalid code? */
        wc = (wc << 8) + b;		/* Make a DBC */
    }
    if (wc != 0) {
        wc = ff_oem2uni(wc, CODEPAGE);	/* ANSI/OEM ==> Unicode */
        if (wc == 0) return 0xFFFFFFFF;	/* Invalid code? */
    }
    uc = wc;

#endif
    *str = p;	/* Next read pointer */
    return uc;
}


/* Output a TCHAR string in defined API encoding */
static BYTE put_utf (	/* Returns number of encoding units written (0:buffer overflow or wrong encoding) */
    DWORD chr,	/* UTF-16 encoded character (Surrogate pair if >=0x10000) */
    TCHAR* buf,	/* Output buffer */
    UINT szb	/* Size of the buffer */
)
{
#if FF_LFN_UNICODE == 1	/* UTF-16 output */
    WCHAR hs, wc;

    hs = (WCHAR)(chr >> 16);
    wc = (WCHAR)chr;
    if (hs == 0) {	/* Single encoding unit? */
        if (szb < 1 || IsSurrogate(wc)) return 0;	/* Buffer overflow or wrong code? */
        *buf = wc;
        return 1;
    }
    if (szb < 2 || !IsSurrogateH(hs) || !IsSurrogateL(wc)) return 0;	/* Buffer overflow or wrong surrogate? */
    *buf++ = hs;
    *buf++ = wc;
    return 2;

#elif FF_LFN_UNICODE == 2	/* UTF-8 output */
    DWORD hc;

    if (chr < 0x80) {	/* Single byte code? */
        if (szb < 1) return 0;	/* Buffer overflow? */
        *buf = (TCHAR)chr;
        return 1;
    }
    if (chr < 0x800) {	/* 2-byte sequence? */
        if (szb < 2) return 0;	/* Buffer overflow? */
        *buf++ = (TCHAR)(0xC0 | (chr >> 6 & 0x1F));
        *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
        return 2;
    }
    if (chr < 0x10000) {	/* 3-byte sequence? */
        if (szb < 3 || IsSurrogate(chr)) return 0;	/* Buffer overflow or wrong code? */
        *buf++ = (TCHAR)(0xE0 | (chr >> 12 & 0x0F));
        *buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
        *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
        return 3;
    }
    /* 4-byte sequence */
    if (szb < 4) return 0;	/* Buffer overflow? */
    hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6;	/* Get high 10 bits */
    chr = (chr & 0xFFFF) - 0xDC00;					/* Get low 10 bits */
    if (hc >= 0x100000 || chr >= 0x400) return 0;	/* Wrong surrogate? */
    chr = (hc | chr) + 0x10000;
    *buf++ = (TCHAR)(0xF0 | (chr >> 18 & 0x07));
    *buf++ = (TCHAR)(0x80 | (chr >> 12 & 0x3F));
    *buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
    *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
    return 4;

#elif FF_LFN_UNICODE == 3	/* UTF-32 output */
    DWORD hc;

    if (szb < 1) return 0;	/* Buffer overflow? */
    if (chr >= 0x10000) {	/* Out of BMP? */
        hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6;	/* Get high 10 bits */
        chr = (chr & 0xFFFF) - 0xDC00;					/* Get low 10 bits */
        if (hc >= 0x100000 || chr >= 0x400) return 0;	/* Wrong surrogate? */
        chr = (hc | chr) + 0x10000;
    }
    *buf++ = (TCHAR)chr;
    return 1;

#else						/* ANSI/OEM output */
    WCHAR wc;

    wc = ff_uni2oem(chr, CODEPAGE);
    if (wc >= 0x100) {	/* Is this a DBC? */
        if (szb < 2) return 0;
        *buf++ = (char)(wc >> 8);	/* Store DBC 1st byte */
        *buf++ = (TCHAR)wc;			/* Store DBC 2nd byte */
        return 2;
    }
    if (wc == 0 || szb < 1) return 0;	/* Invalid char or buffer overflow? */
    *buf++ = (TCHAR)wc;					/* Store the character */
    return 1;
#endif
}
#endif	/* FF_USE_LFN */


#if FF_FS_REENTRANT
/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
static int lock_fs (		/* 1:Ok, 0:timeout */
    FATFS* fs		/* Filesystem object */
)
{
    return ff_req_grant(fs->sobj);
}


static void unlock_fs (
    FATFS* fs,		/* Filesystem 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 FF_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 mode open, 1:Write mode open, 2:Delete or rename) */
)
{
    UINT i, be;

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

    /* The object was opened. Reject any open against writing file and all write mode open */
    return (acc != 0 || 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 < FF_FS_LOCK && Files[i].fs; i++) ;
    return (i == FF_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 < FF_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 == FF_FS_LOCK) {				/* Not opened. Register it as new. */
        for (i = 0; i < FF_FS_LOCK && Files[i].fs; i++) ;
        if (i == FF_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 >= 1 && Files[i].ctr) return 0;	/* Access violation (int err) */

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

    return i + 1;	/* Index number origin from 1 */
}


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


    if (--i < FF_FS_LOCK) {	/* 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 < FF_FS_LOCK; i++) {
        if (Files[i].fs == fs) Files[i].fs = 0;
    }
}

#endif	/* FF_FS_LOCK != 0 */



/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the filesystem object                */
/*-----------------------------------------------------------------------*/
#if !FF_FS_READONLY
static FRESULT sync_window (	/* Returns FR_OK or FR_DISK_ERR */
    FATFS* fs			/* Filesystem object */
)
{
    FRESULT res = FR_OK;


    if (fs->wflag) {	/* Is the disk access window dirty? */
        if (disk_write(fs->pdrv, fs->win, fs->winsect, 1) == RES_OK) {	/* Write it back into the volume */
            fs->wflag = 0;	/* Clear window dirty flag */
            if (fs->winsect - fs->fatbase < fs->fsize) {	/* Is it in the 1st FAT? */
                if (fs->n_fats == 2) disk_write(fs->pdrv, fs->win, fs->winsect + fs->fsize, 1);	/* Reflect it to 2nd FAT if needed */
            }
        } else {
            res = FR_DISK_ERR;
        }
    }
    return res;
}
#endif


static FRESULT move_window (	/* Returns FR_OK or FR_DISK_ERR */
    FATFS* fs,		/* Filesystem object */
    LBA_t sect		/* Sector LBA to make appearance in the fs->win[] */
)
{
    FRESULT res = FR_OK;


    if (sect != fs->winsect) {	/* Window offset changed? */
#if !FF_FS_READONLY
        res = sync_window(fs);		/* Flush the window */
#endif
        if (res == FR_OK) {			/* Fill sector window with new data */
            if (disk_read(fs->pdrv, fs->win, sect, 1) != RES_OK) {
                sect = (LBA_t)0 - 1;	/* Invalidate window if read data is not valid */
                res = FR_DISK_ERR;
            }
            fs->winsect = sect;
        }
    }
    return res;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Synchronize filesystem and data on the storage                        */
/*-----------------------------------------------------------------------*/

static FRESULT sync_fs (	/* Returns FR_OK or FR_DISK_ERR */
    FATFS* fs		/* Filesystem object */
)
{
    FRESULT res;


    res = sync_window(fs);
    if (res == FR_OK) {
        if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {	/* FAT32: Update FSInfo sector if needed */
            /* Create FSInfo structure */
            mem_set(fs->win, 0, sizeof fs->win);
            st_word(fs->win + BS_55AA, 0xAA55);					/* Boot signature */
            st_dword(fs->win + FSI_LeadSig, 0x41615252);		/* Leading signature */
            st_dword(fs->win + FSI_StrucSig, 0x61417272);		/* Structure signature */
            st_dword(fs->win + FSI_Free_Count, fs->free_clst);	/* Number of free clusters */
            st_dword(fs->win + FSI_Nxt_Free, fs->last_clst);	/* Last allocated culuster */
            fs->winsect = fs->volbase + 1;						/* Write it into the FSInfo sector (Next to VBR) */
            disk_write(fs->pdrv, fs->win, fs->winsect, 1);
            fs->fsi_flag = 0;
        }
        /* Make sure that no pending write process in the lower layer */
        if (disk_ioctl(fs->pdrv, CTRL_SYNC, 0) != RES_OK) res = FR_DISK_ERR;
    }

    return res;
}

#endif



/*-----------------------------------------------------------------------*/
/* Get physical sector number from cluster number                        */
/*-----------------------------------------------------------------------*/

static LBA_t clst2sect (	/* !=0:Sector number, 0:Failed (invalid cluster#) */
    FATFS* fs,		/* Filesystem object */
    DWORD clst		/* Cluster# to be converted */
)
{
    clst -= 2;		/* Cluster number is origin from 2 */
    if (clst >= fs->n_fatent - 2) return 0;		/* Is it invalid cluster number? */
    return fs->database + (LBA_t)fs->csize * clst;	/* Start sector number of the cluster */
}




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

static DWORD get_fat (		/* 0xFFFFFFFF:Disk error, 1:Internal error, 2..0x7FFFFFFF:Cluster status */
    FFOBJID* 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)];		/* Get 1st byte of the entry */
            if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
            wc |= fs->win[bc % SS(fs)] << 8;	/* Merge 2nd byte of the entry */
            val = (clst & 1) ? (wc >> 4) : (wc & 0xFFF);	/* Adjust bit position */
            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));		/* Simple WORD array */
            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;	/* Simple DWORD array but mask out upper 4 bits */
            break;
#if FF_FS_EXFAT
        case FS_EXFAT :
            if ((obj->objsize != 0 && obj->sclust != 0) || obj->stat == 0) {	/* Object except root dir must have valid data length */
                DWORD cofs = clst - obj->sclust;	/* Offset from start cluster */
                DWORD clen = (DWORD)((LBA_t)((obj->objsize - 1) / SS(fs)) / fs->csize);	/* Number of clusters - 1 */

                if (obj->stat == 2 && cofs <= clen) {	/* Is it a contiguous chain? */
                    val = (cofs == clen) ? 0x7FFFFFFF : clst + 1;	/* No data on the FAT, generate the value */
                    break;
                }
                if (obj->stat == 3 && cofs < obj->n_cont) {	/* Is it in the 1st fragment? */
                    val = clst + 1; 	/* Generate the value */
                    break;
                }
                if (obj->stat != 2) {	/* Get value from FAT if FAT chain is valid */
                    if (obj->n_frag != 0) {	/* Is it on the growing edge? */
                        val = 0x7FFFFFFF;	/* Generate EOC */
                    } else {
                        if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
                        val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x7FFFFFFF;
                    }
                    break;
                }
            }
            val = 1;	/* Internal error */
            break;
#endif
        default:
            val = 1;	/* Internal error */
        }
    }

    return val;
}




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

static FRESULT put_fat (	/* FR_OK(0):succeeded, !=0:error */
    FATFS* fs,		/* Corresponding filesystem 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:
            bc = (UINT)clst; bc += bc / 2;	/* bc: byte offset of the entry */
            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;		/* Update 1st byte */
            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));	/* Update 2nd byte */
            fs->wflag = 1;
            break;

        case FS_FAT16:
            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);	/* Simple WORD array */
            fs->wflag = 1;
            break;

        case FS_FAT32:
#if FF_FS_EXFAT
        case FS_EXFAT:
#endif
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
            if (res != FR_OK) break;
            if (!FF_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 /* !FF_FS_READONLY */




#if FF_FS_EXFAT && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* exFAT: Accessing FAT and Allocation Bitmap                            */
/*-----------------------------------------------------------------------*/

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

static DWORD find_bitmap (	/* 0:Not found, 2..:Cluster block found, 0xFFFFFFFF:Disk error */
    FATFS* fs,	/* Filesystem 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->bitbase + val / 8 / SS(fs)) != FR_OK) return 0xFFFFFFFF;
        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 = SS(fs);
                }
                if (bv == 0) {	/* Is it a free cluster? */
                    if (++ctr == ncl) return scl + 2;	/* Check if run length is sufficient for required */
                } else {
                    scl = val; ctr = 0;		/* Encountered a cluster in-use, restart to scan */
                }
                if (val == clst) return 0;	/* All cluster scanned? */
            } while (bm != 0);
            bm = 1;
        } while (++i < SS(fs));
    }
}


/*----------------------------------------*/
/* Set/Clear a block of allocation bitmap */
/*----------------------------------------*/

static FRESULT change_bitmap (
    FATFS* fs,	/* Filesystem 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;
    LBA_t sect;


    clst -= 2;	/* The first bit corresponds to cluster #2 */
    sect = fs->bitbase + clst / 8 / SS(fs);	/* Sector address */
    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;
    }
}


/*---------------------------------------------*/
/* Fill the first fragment of the FAT chain    */
/*---------------------------------------------*/

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


    if (obj->stat == 3) {	/* Has the object been changed 'fragmented' in this session? */
        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;
}


/*---------------------------------------------*/
/* Fill the last fragment of the FAT chain     */
/*---------------------------------------------*/

static FRESULT fill_last_frag (
    FFOBJID* obj,	/* Pointer to the corresponding object */
    DWORD lcl,		/* Last cluster of the fragment */
    DWORD term		/* Value to set the last FAT entry */
)
{
    FRESULT res;


    while (obj->n_frag > 0) {	/* Create the chain of last fragment */
        res = put_fat(obj->fs, lcl - obj->n_frag + 1, (obj->n_frag > 1) ? lcl - obj->n_frag + 2 : term);
        if (res != FR_OK) return res;
        obj->n_frag--;
    }
    return FR_OK;
}

#endif	/* FF_FS_EXFAT && !FF_FS_READONLY */



#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/

static FRESULT remove_chain (	/* FR_OK(0):succeeded, !=0:error */
    FFOBJID* obj,		/* Corresponding object */
    DWORD clst,			/* Cluster to remove a chain from */
    DWORD pclst			/* Previous cluster of clst (0 if entire chain) */
)
{
    FRESULT res = FR_OK;
    DWORD nxt;
    FATFS *fs = obj->fs;
#if FF_FS_EXFAT || FF_USE_TRIM
    DWORD scl = clst, ecl = clst;
#endif
#if FF_USE_TRIM
    LBA_t 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 != 0 && (!FF_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 (!FF_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 FF_FS_EXFAT || FF_USE_TRIM
        if (ecl + 1 == nxt) {	/* Is next cluster contiguous? */
            ecl = nxt;
        } else {				/* End of contiguous cluster block */
#if FF_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 FF_USE_TRIM
            rt[0] = clst2sect(fs, scl);					/* Start of data area to be freed */
            rt[1] = clst2sect(fs, ecl) + fs->csize - 1;	/* End of data area to be freed */
            disk_ioctl(fs->pdrv, CTRL_TRIM, rt);		/* Inform storage device that the data in the block may be erased */
#endif
            scl = ecl = nxt;
        }
#endif
        clst = nxt;					/* Next cluster */
    } while (clst < fs->n_fatent);	/* Repeat while not the last link */

#if FF_FS_EXFAT
    /* Some post processes for chain status */
    if (fs->fs_type == FS_EXFAT) {
        if (pclst == 0) {	/* Has the entire chain been removed? */
            obj->stat = 0;		/* Change the chain status 'initial' */
        } else {
            if (obj->stat == 0) {	/* Is it a fragmented chain from the beginning of this session? */
                clst = obj->sclust;		/* Follow the chain to check if it gets contiguous */
                while (clst != pclst) {
                    nxt = get_fat(obj, clst);
                    if (nxt < 2) return FR_INT_ERR;
                    if (nxt == 0xFFFFFFFF) return FR_DISK_ERR;
                    if (nxt != clst + 1) break;	/* Not contiguous? */
                    clst++;
                }
                if (clst == pclst) {	/* Has the chain got contiguous again? */
                    obj->stat = 2;		/* Change the chain status 'contiguous' */
                }
            } else {
                if (obj->stat == 3 && pclst >= obj->sclust && pclst <= obj->sclust + obj->n_cont) {	/* Was the chain fragmented in this session and got contiguous again? */
                    obj->stat = 2;	/* Change the chain 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# */
    FFOBJID* 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;				/* Suggested cluster to start to find */
        if (scl == 0 || scl >= fs->n_fatent) scl = 1;
    }
    else {				/* Stretch a chain */
        cs = get_fat(obj, clst);			/* Check the cluster status */
        if (cs < 2) return 1;				/* Test for insanity */
        if (cs == 0xFFFFFFFF) return cs;	/* Test for disk error */
        if (cs < fs->n_fatent) return cs;	/* It is already followed by next cluster */
        scl = clst;							/* Cluster to start to find */
    }
    if (fs->free_clst == 0) return 0;		/* No free cluster */

#if FF_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' */
        } else {									/* It 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' */
            }
        }
        if (obj->stat != 2) {	/* Is the file non-contiguous? */
            if (ncl == clst + 1) {	/* Is the cluster next to previous one? */
                obj->n_frag = obj->n_frag ? obj->n_frag + 1 : 2;	/* Increment size of last framgent */
            } else {				/* New fragment */
                if (obj->n_frag == 0) obj->n_frag = 1;
                res = fill_last_frag(obj, clst, ncl);	/* Fill last fragment on the FAT and link it to new one */
                if (res == FR_OK) obj->n_frag = 1;
            }
        }
    } else
#endif
    {	/* On the FAT/FAT32 volume */
        ncl = 0;
        if (scl == clst) {						/* Stretching an existing chain? */
            ncl = scl + 1;						/* Test if next cluster is free */
            if (ncl >= fs->n_fatent) ncl = 2;
            cs = get_fat(obj, ncl);				/* Get next cluster status */
            if (cs == 1 || cs == 0xFFFFFFFF) return cs;	/* Test for error */
            if (cs != 0) {						/* Not free? */
                cs = fs->last_clst;				/* Start at suggested cluster if it is valid */
                if (cs >= 2 && cs < fs->n_fatent) scl = cs;
                ncl = 0;
            }
        }
        if (ncl == 0) {	/* The new cluster cannot be contiguous and find another fragment */
            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 found? */
                }
                cs = get_fat(obj, ncl);			/* Get the cluster status */
                if (cs == 0) break;				/* Found a free cluster? */
                if (cs == 1 || cs == 0xFFFFFFFF) return cs;	/* Test for error */
                if (ncl == scl) return 0;		/* No free cluster found? */
            }
        }
        res = put_fat(fs, ncl, 0xFFFFFFFF);		/* Mark the new cluster 'EOC' */
        if (res == FR_OK && clst != 0) {
            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. Generate error status */
    }

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

#endif /* !FF_FS_READONLY */




#if FF_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	/* FF_USE_FASTSEEK */




/*-----------------------------------------------------------------------*/
/* Directory handling - Fill a cluster with zeros                        */
/*-----------------------------------------------------------------------*/

#if !FF_FS_READONLY
static FRESULT dir_clear (	/* Returns FR_OK or FR_DISK_ERR */
    FATFS *fs,		/* Filesystem object */
    DWORD clst		/* Directory table to clear */
)
{
    LBA_t sect;
    UINT n, szb;
    BYTE *ibuf;


    if (sync_window(fs) != FR_OK) return FR_DISK_ERR;	/* Flush disk access window */
    sect = clst2sect(fs, clst);		/* Top of the cluster */
    fs->winsect = sect;				/* Set window to top of the cluster */
    mem_set(fs->win, 0, sizeof fs->win);	/* Clear window buffer */
#if FF_USE_LFN == 3		/* Quick table clear by using multi-secter write */
    /* Allocate a temporary buffer */
    for (szb = ((DWORD)fs->csize * SS(fs) >= MAX_MALLOC) ? MAX_MALLOC : fs->csize * SS(fs), ibuf = 0; szb > SS(fs) && (ibuf = ff_memalloc(szb)) == 0; szb /= 2) ;
    if (szb > SS(fs)) {		/* Buffer allocated? */
        mem_set(ibuf, 0, szb);
        szb /= SS(fs);		/* Bytes -> Sectors */
        for (n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;	/* Fill the cluster with 0 */
        ff_memfree(ibuf);
    } else
#endif
    {
        ibuf = fs->win; szb = 1;	/* Use window buffer (many single-sector writes may take a time) */
        for (n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;	/* Fill the cluster with 0 */
    }
    return (n == fs->csize) ? FR_OK : FR_DISK_ERR;
}
#endif	/* !FF_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* 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)((FF_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 = (DWORD)fs->dirbase;
        if (FF_FS_EXFAT) dp->obj.stat = 0;	/* exFAT: Root dir has an FAT chain */
    }

    if (clst == 0) {	/* Static table (root-directory on the FAT volume) */
        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 on the FAT32/exFAT volume) */
        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 = clst2sect(fs, clst);
    }
    dp->clust = clst;					/* Current cluster# */
    if (dp->sect == 0) 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;


    ofs = dp->dptr + SZDIRE;	/* Next entry */
    if (ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR)) dp->sect = 0;	/* Disable it if the offset reached the max value */
    if (dp->sect == 0) return FR_NO_FILE;	/* Report EOT if it has been disabled */

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

        if (dp->clust == 0) {	/* 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) {					/* It reached end of dynamic table */
#if !FF_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 */
                    if (dir_clear(fs, clst) != FR_OK) return FR_DISK_ERR;	/* Clean up the stretched table */
                    if (FF_FS_EXFAT) dp->obj.stat |= 4;			/* exFAT: The directory has been stretched */
#else
                    if (!stretch) dp->sect = 0;					/* (this line is to suppress compiler warning) */
                    dp->sect = 0; return FR_NO_FILE;			/* Report EOT */
#endif
                }
                dp->clust = clst;		/* Initialize data for new cluster */
                dp->sect = clst2sect(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 !FF_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 n_ent				/* 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 FF_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)) {	/* Is the entry free? */
#else
            if (dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0) {	/* Is the entry free? */
#endif
                if (++n == n_ent) break;	/* Is a block of contiguous free entries found? */
            } else {
                n = 0;				/* Not a free entry, restart to search */
            }
            res = dir_next(dp, 1);	/* Next entry with table stretch enabled */
        } while (res == FR_OK);
    }

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

#endif	/* !FF_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 !FF_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 FF_USE_LFN
/*--------------------------------------------------------*/
/* 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 != 0) {
            if (i >= FF_MAX_LFN + 1 || 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 FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_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 is 0 */

    i = ((dir[LDIR_Ord] & ~LLEF) - 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 != 0) {
            if (i >= FF_MAX_LFN + 1) return 0;	/* Buffer overflow? */
            lfnbuf[i++] = wc = uc;			/* Store it */
        } else {
            if (uc != 0xFFFF) return 0;		/* Check filler */
        }
    }

    if (dir[LDIR_Ord] & LLEF && wc != 0) {	/* Put terminator if it is the last LFN part and not terminated */
        if (i >= FF_MAX_LFN + 1) return 0;	/* Buffer overflow? */
        lfnbuf[i] = 0;
    }

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


#if !FF_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 following items */
    } 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	/* !FF_FS_READONLY */
#endif	/* FF_USE_LFN */



#if FF_USE_LFN && !FF_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 sreg;


    mem_cpy(dst, src, 11);

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

    /* 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 to the SFN body */
    for (j = 0; j < i && dst[j] != ' '; j++) {
        if (dbc_1st(dst[j])) {
            if (j == i - 1) break;
            j++;
        }
    }
    do {
        dst[j++] = (i < 8) ? ns[i++] : ' ';
    } while (j < 8);
}
#endif	/* FF_USE_LFN && !FF_FS_READONLY */



#if FF_USE_LFN
/*-----------------------------------------------------------------------*/
/* 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	/* FF_USE_LFN */



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

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


    szblk = (dir[XDIR_NumSec] + 1) * SZDIRE;	/* Number of bytes of the entry block */
    for (i = sum = 0; i < szblk; i++) {
        if (i == XDIR_SetSum) {	/* Skip 2-byte 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 file name */
    const WCHAR* name	/* File name to be calculated */
)
{
    WCHAR chr;
    WORD sum = 0;


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


#if !FF_FS_READONLY && FF_USE_MKFS
static DWORD xsum32 (	/* Returns 32-bit checksum */
    BYTE  dat,			/* Byte to be calculated (byte-by-byte processing) */
    DWORD sum			/* Previous sum value */
)
{
    sum = ((sum & 1) ? 0x80000000 : 0) + (sum >> 1) + dat;
    return sum;
}
#endif


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

static void get_xfileinfo (
    BYTE* dirb,			/* Pointer to the direcotry entry block 85+C0+C1s */
    FILINFO* fno		/* Buffer to store the extracted file information */
)
{
    WCHAR wc, hs;
    UINT di, si, nc;

    /* Get file name from the entry block */
    si = SZDIRE * 2;	/* 1st C1 entry */
    nc = 0; hs = 0; di = 0;
    while (nc < dirb[XDIR_NumName]) {
        if (si >= MAXDIRB(FF_MAX_LFN)) { di = 0; break; }	/* Truncated directory block? */
        if ((si % SZDIRE) == 0) si += 2;		/* Skip entry type field */
        wc = ld_word(dirb + si); si += 2; nc++;	/* Get a character */
        if (hs == 0 && IsSurrogate(wc)) {	/* Is it a surrogate? */
            hs = wc; continue;	/* Get low surrogate */
        }
        wc = put_utf((DWORD)hs << 16 | wc, &fno->fname[di], FF_LFN_BUF - di);	/* Store it in API encoding */
        if (wc == 0) { di = 0; break; }	/* Buffer overflow or wrong encoding? */
        di += wc;
        hs = 0;
    }
    if (hs != 0) di = 0;					/* Broken surrogate pair? */
    if (di == 0) fno->fname[di++] = '?';	/* Inaccessible object name? */
    fno->fname[di] = 0;						/* Terminate the name */
    fno->altname[0] = 0;					/* exFAT does not support 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	/* FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 */


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

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


    /* Load file-directory entry */
    res = move_window(dp->obj.fs, dp->sect);
    if (res != FR_OK) return res;
    if (dp->dir[XDIR_Type] != ET_FILEDIR) return FR_INT_ERR;	/* Invalid order */
    mem_cpy(dirb + 0 * SZDIRE, dp->dir, SZDIRE);
    sz_ent = (dirb[XDIR_NumSec] + 1) * SZDIRE;
    if (sz_ent < 3 * SZDIRE || sz_ent > 19 * SZDIRE) return FR_INT_ERR;

    /* Load stream-extension entry */
    res = dir_next(dp, 0);
    if (res == FR_NO_FILE) res = FR_INT_ERR;	/* It cannot be */
    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] != ET_STREAM) return FR_INT_ERR;	/* Invalid order */
    mem_cpy(dirb + 1 * SZDIRE, dp->dir, SZDIRE);
    if (MAXDIRB(dirb[XDIR_NumName]) > sz_ent) return FR_INT_ERR;

    /* Load file-name entries */
    i = 2 * SZDIRE;	/* Name offset to load */
    do {
        res = dir_next(dp, 0);
        if (res == FR_NO_FILE) res = FR_INT_ERR;	/* It cannot be */
        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] != ET_FILENAME) return FR_INT_ERR;	/* Invalid order */
        if (i < MAXDIRB(FF_MAX_LFN)) mem_cpy(dirb + i, dp->dir, SZDIRE);
    } while ((i += SZDIRE) < sz_ent);

    /* Sanity check (do it for only accessible object) */
    if (i <= MAXDIRB(FF_MAX_LFN)) {
        if (xdir_sum(dirb) != ld_word(dirb + XDIR_SetSum)) return FR_INT_ERR;
    }
    return FR_OK;
}


/*------------------------------------------------------------------*/
/* exFAT: Initialize object allocation info with loaded entry block */
/*------------------------------------------------------------------*/

static void init_alloc_info (
    FATFS* fs,		/* Filesystem object */
    FFOBJID* obj	/* Object allocation information to be initialized */
)
{
    obj->sclust = ld_dword(fs->dirbuf + XDIR_FstClus);		/* Start cluster */
    obj->objsize = ld_qword(fs->dirbuf + XDIR_FileSize);	/* Size */
    obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;				/* Allocation status */
    obj->n_frag = 0;										/* No last fragment info */
}



#if !FF_FS_READONLY || FF_FS_RPATH != 0
/*------------------------------------------------*/
/* exFAT: Load the object's directory entry block */
/*------------------------------------------------*/

static FRESULT load_obj_xdir (
    DIR* dp,			/* Blank directory object to be used to access containing direcotry */
    const FFOBJID* obj	/* Object with its 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->obj.n_frag = 0;
    dp->blk_ofs = obj->c_ofs;

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


#if !FF_FS_READONLY
/*----------------------------------------*/
/* exFAT: Store the directory entry block */
/*----------------------------------------*/

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 direcotry entry block to the directory */
    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 object name */
)
{
    UINT i;
    BYTE nc1, nlen;
    WCHAR wc;


    /* Create file-directory and stream-extension entry */
    mem_set(dirb, 0, 2 * SZDIRE);
    dirb[0 * SZDIRE + XDIR_Type] = ET_FILEDIR;
    dirb[1 * SZDIRE + XDIR_Type] = ET_STREAM;

    /* Create file-name entries */
    i = SZDIRE * 2;	/* Top of file_name entries */
    nlen = nc1 = 0; wc = 1;
    do {
        dirb[i++] = ET_FILENAME; dirb[i++] = 0;
        do {	/* Fill name field */
            if (wc != 0 && (wc = lfn[nlen]) != 0) nlen++;	/* Get a character if exist */
            st_word(dirb + i, wc); 		/* Store it */
            i += 2;
        } while (i % SZDIRE != 0);
        nc1++;
    } while (lfn[nlen]);	/* Fill next entry if any char follows */

    dirb[XDIR_NumName] = nlen;		/* Set name length */
    dirb[XDIR_NumSec] = 1 + nc1;	/* Set secondary count (C0 + C1s) */
    st_word(dirb + XDIR_NameHash, xname_sum(lfn));	/* Set name hash */
}

#endif	/* !FF_FS_READONLY */
#endif	/* FF_FS_EXFAT */



#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/

#define DIR_READ_FILE(dp) dir_read(dp, 0)
#define DIR_READ_LABEL(dp) dir_read(dp, 1)

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 attr, b;
#if FF_USE_LFN
    BYTE ord = 0xFF, sum = 0xFF;
#endif

    while (dp->sect) {
        res = move_window(fs, dp->sect);
        if (res != FR_OK) break;
        b = dp->dir[DIR_Name];	/* Test for the entry type */
        if (b == 0) {
            res = FR_NO_FILE; break; /* Reached to end of the directory */
        }
#if FF_FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
            if (FF_USE_LABEL && vol) {
                if (b == ET_VLABEL) break;	/* Volume label entry? */
            } else {
                if (b == ET_FILEDIR) {		/* 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 FAT/FAT32 volume */
            dp->obj.attr = attr = dp->dir[DIR_Attr] & AM_MASK;	/* Get attribute */
#if FF_USE_LFN		/* LFN configuration */
            if (b == DDEM || b == '.' || (int)((attr & ~AM_ARC) == AM_VOL) != vol) {	/* An entry without valid data */
                ord = 0xFF;
            } else {
                if (attr == AM_LFN) {			/* An LFN entry is found */
                    if (b & LLEF) {			/* Is it start of an LFN sequence? */
                        sum = dp->dir[LDIR_Chksum];
                        b &= (BYTE)~LLEF; ord = b;
                        dp->blk_ofs = dp->dptr;
                    }
                    /* Check LFN validity and capture it */
                    ord = (b == ord && sum == dp->dir[LDIR_Chksum] && pick_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
                } else {					/* An SFN entry is found */
                    if (ord != 0 || sum != sum_sfn(dp->dir)) {	/* Is there a valid LFN? */
                        dp->blk_ofs = 0xFFFFFFFF;			/* It has no LFN. */
                    }
                    break;
                }
            }
#else		/* Non LFN configuration */
            if (b != DDEM && b != '.' && attr != AM_LFN && (int)((attr & ~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	/* FF_FS_MINIMIZE <= 1 || FF_USE_LABEL || FF_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 FF_USE_LFN
    BYTE a, ord, sum;
#endif

    res = dir_sdi(dp, 0);			/* Rewind directory object */
    if (res != FR_OK) return res;
#if FF_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_FILE(dp)) == FR_OK) {	/* Read an item */
#if FF_MAX_LFN < 255
            if (fs->dirbuf[XDIR_NumName] > FF_MAX_LFN) continue;			/* Skip comparison if inaccessible object name */
#endif
            if (ld_word(fs->dirbuf + XDIR_NameHash) != hash) continue;	/* Skip comparison if hash 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 FAT/FAT32 volume */
#if FF_USE_LFN
    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 FF_USE_LFN		/* 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 == 0 && 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 !FF_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 FF_USE_LFN		/* LFN configuration */
    UINT n, len, n_ent;
    BYTE sn[12], sum;


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

#if FF_FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
        n_ent = (len + 14) / 15 + 2;	/* Number of entries to allocate (85+C0+C1s) */
        res = dir_alloc(dp, n_ent);		/* Allocate directory entries */
        if (res != FR_OK) return res;
        dp->blk_ofs = dp->dptr - SZDIRE * (n_ent - 1);	/* Set the allocated entry block offset */

        if (dp->obj.stat & 4) {			/* Has the directory been stretched by new allocation? */
            dp->obj.stat &= ~4;
            res = fill_first_frag(&dp->obj);	/* Fill the first fragment on the FAT if needed */
            if (res != FR_OK) return res;
            res = fill_last_frag(&dp->obj, dp->clust, 0xFFFFFFFF);	/* Fill the last fragment on the FAT if needed */
            if (res != FR_OK) return res;
            if (dp->obj.sclust != 0) {		/* Is it a sub-directory? */
                DIR dj;

                res = load_obj_xdir(&dj, &dp->obj);	/* Load the object status */
                if (res != FR_OK) return res;
                dp->obj.objsize += (DWORD)fs->csize * SS(fs);			/* Increase the directory size by cluster size */
                st_qword(fs->dirbuf + XDIR_FileSize, dp->obj.objsize);
                st_qword(fs->dirbuf + XDIR_ValidFileSize, dp->obj.objsize);
                fs->dirbuf[XDIR_GenFlags] = dp->obj.stat | 1;			/* Update the allocation status */
                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 FAT/FAT32 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. */
    n_ent = (sn[NSFLAG] & NS_LFN) ? (len + 12) / 13 + 1 : 1;	/* Number of entries to allocate */
    res = dir_alloc(dp, n_ent);		/* Allocate entries */
    if (res == FR_OK && --n_ent) {	/* Set LFN entry if needed */
        res = dir_sdi(dp, dp->dptr - n_ent * 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)n_ent, sum);
                fs->wflag = 1;
                res = dir_next(dp, 0);	/* Next entry */
            } while (res == FR_OK && --n_ent);
        }
    }

#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 FF_USE_LFN
            dp->dir[DIR_NTres] = dp->fn[NSFLAG] & (NS_BODY | NS_EXT);	/* Put NT flag */
#endif
            fs->wflag = 1;
        }
    }

    return res;
}

#endif /* !FF_FS_READONLY */



#if !FF_FS_READONLY && FF_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 FF_USE_LFN		/* 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;
            if (FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
                dp->dir[XDIR_Type] &= 0x7F;	/* Clear the entry InUse flag. */
            } else {									/* On the FAT/FAT32 volume */
                dp->dir[DIR_Name] = DDEM;	/* Mark the entry 'deleted'. */
            }
            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;	/* Mark the entry 'deleted'.*/
        fs->wflag = 1;
    }
#endif

    return res;
}

#endif /* !FF_FS_READONLY && FF_FS_MINIMIZE == 0 */



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

static void get_fileinfo (
    DIR* dp,			/* Pointer to the directory object */
    FILINFO* fno		/* Pointer to the file information to be filled */
)
{
    UINT si, di;
#if FF_USE_LFN
    BYTE lcf;
    WCHAR wc, hs;
    FATFS *fs = dp->obj.fs;
#else
    TCHAR c;
#endif


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

#if FF_USE_LFN		/* LFN configuration */
#if FF_FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
        get_xfileinfo(fs->dirbuf, fno);
        return;
    } else
#endif
    {	/* On the FAT/FAT32 volume */
        if (dp->blk_ofs != 0xFFFFFFFF) {	/* Get LFN if available */
            si = di = hs = 0;
            while (fs->lfnbuf[si] != 0) {
                wc = fs->lfnbuf[si++];		/* Get an LFN character (UTF-16) */
                if (hs == 0 && IsSurrogate(wc)) {	/* Is it a surrogate? */
                    hs = wc; continue;		/* Get low surrogate */
                }
                wc = put_utf((DWORD)hs << 16 | wc, &fno->fname[di], FF_LFN_BUF - di);	/* Store it in UTF-16 or UTF-8 encoding */
                if (wc == 0) { di = 0; break; }	/* Invalid char or buffer overflow? */
                di += wc;
                hs = 0;
            }
            if (hs != 0) di = 0;	/* Broken surrogate pair? */
            fno->fname[di] = 0;		/* Terminate the LFN (null string means LFN is invalid) */
        }
    }

    si = di = 0;
    while (si < 11) {		/* Get SFN from SFN entry */
        wc = dp->dir[si++];			/* Get a char */
        if (wc == ' ') continue;	/* Skip padding spaces */
        if (wc == RDDEM) wc = DDEM;	/* Restore replaced DDEM character */
        if (si == 9 && di < FF_SFN_BUF) fno->altname[di++] = '.';	/* Insert a . if extension is exist */
#if FF_LFN_UNICODE >= 1	/* Unicode output */
        if (dbc_1st((BYTE)wc) && si != 8 && si != 11 && dbc_2nd(dp->dir[si])) {	/* Make a DBC if needed */
            wc = wc << 8 | dp->dir[si++];
        }
        wc = ff_oem2uni(wc, CODEPAGE);		/* ANSI/OEM -> Unicode */
        if (wc == 0) { di = 0; break; }		/* Wrong char in the current code page? */
        wc = put_utf(wc, &fno->altname[di], FF_SFN_BUF - di);	/* Store it in Unicode */
        if (wc == 0) { di = 0; break; }		/* Buffer overflow? */
        di += wc;
#else					/* ANSI/OEM output */
        fno->altname[di++] = (TCHAR)wc;	/* Store it without any conversion */
#endif
    }
    fno->altname[di] = 0;	/* Terminate the SFN  (null string means SFN is invalid) */

    if (fno->fname[0] == 0) {	/* If LFN is invalid, altname[] needs to be copied to fname[] */
        if (di == 0) {	/* If LFN and SFN both are invalid, this object is inaccesible */
            fno->fname[di++] = '?';
        } else {
            for (si = di = 0, lcf = NS_BODY; fno->altname[si]; si++, di++) {	/* Copy altname[] to fname[] with case information */
                wc = (WCHAR)fno->altname[si];
                if (wc == '.') lcf = NS_EXT;
                if (IsUpper(wc) && (dp->dir[DIR_NTres] & lcf)) wc += 0x20;
                fno->fname[di] = (TCHAR)wc;
            }
        }
        fno->fname[di] = 0;	/* Terminate the LFN */
        if (!dp->dir[DIR_NTres]) fno->altname[0] = 0;	/* Altname is not needed if neither LFN nor case info is exist. */
    }

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

    fno->fattrib = dp->dir[DIR_Attr];					/* Attribute */
    fno->fsize = ld_dword(dp->dir + DIR_FileSize);		/* Size */
    fno->ftime = ld_word(dp->dir + DIR_ModTime + 0);	/* Time */
    fno->fdate = ld_word(dp->dir + DIR_ModTime + 2);	/* Date */
}

#endif /* FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 */



#if FF_USE_FIND && FF_FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Pattern matching                                                      */
/*-----------------------------------------------------------------------*/

#define FIND_RECURS	4	/* Maximum number of wildcard terms in the pattern to limit recursion */


static DWORD get_achar (	/* Get a character and advance ptr */
    const TCHAR** ptr		/* Pointer to pointer to the ANSI/OEM or Unicode string */
)
{
    DWORD chr;


#if FF_USE_LFN && FF_LFN_UNICODE >= 1	/* Unicode input */
    chr = tchar2uni(ptr);
    if (chr == 0xFFFFFFFF) chr = 0;		/* Wrong UTF encoding is recognized as end of the string */
    chr = ff_wtoupper(chr);

#else									/* ANSI/OEM input */
    chr = (BYTE)*(*ptr)++;				/* Get a byte */
    if (IsLower(chr)) chr -= 0x20;		/* To upper ASCII char */
#if FF_CODE_PAGE == 0
    if (ExCvt && chr >= 0x80) chr = ExCvt[chr - 0x80];	/* To upper SBCS extended char */
#elif FF_CODE_PAGE < 900
    if (chr >= 0x80) chr = ExCvt[chr - 0x80];	/* To upper SBCS extended char */
#endif
#if FF_CODE_PAGE == 0 || FF_CODE_PAGE >= 900
    if (dbc_1st((BYTE)chr)) {	/* Get DBC 2nd byte if needed */
        chr = dbc_2nd((BYTE)**ptr) ? chr << 8 | (BYTE)*(*ptr)++ : 0;
    }
#endif

#endif
    return chr;
}


static int pattern_match (	/* 0:mismatched, 1:matched */
    const TCHAR* pat,	/* Matching pattern */
    const TCHAR* nam,	/* String to be tested */
    UINT skip,			/* Number of pre-skip chars (number of ?s, b8:infinite (* specified)) */
    UINT recur			/* Recursion count */
)
{
    const TCHAR *pptr, *nptr;
    DWORD pchr, nchr;
    UINT sk;


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

    do {
        pptr = pat; nptr = nam;			/* Top of pattern and name to match */
        for (;;) {
            if (*pptr == '?' || *pptr == '*') {	/* Wildcard term? */
                if (recur == 0) return 0;	/* Too many wildcard terms? */
                sk = 0;
                do {	/* Analyze the wildcard term */
                    if (*pptr++ == '?') sk++; else sk |= 0x100;
                } while (*pptr == '?' || *pptr == '*');
                if (pattern_match(pptr, nptr, sk, recur - 1)) return 1;	/* Test new branch (recursive call) */
                nchr = *nptr; break;	/* Branch mismatched */
            }
            pchr = get_achar(&pptr);	/* Get a pattern char */
            nchr = get_achar(&nptr);	/* Get a name char */
            if (pchr != nchr) break;	/* Branch mismatched? */
            if (pchr == 0) return 1;	/* Branch matched? (matched at end of both strings) */
        }
        get_achar(&nam);			/* nam++ */
    } while (skip && nchr);		/* Retry until end of name if infinite search is specified */

    return 0;
}

#endif /* FF_USE_FIND && FF_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 FF_USE_LFN		/* LFN configuration */
    BYTE b, cf;
    WCHAR wc, *lfn;
    DWORD uc;
    UINT i, ni, si, di;
    const TCHAR *p;


    /* Create LFN into LFN working buffer */
    p = *path; lfn = dp->obj.fs->lfnbuf; di = 0;
    for (;;) {
        uc = tchar2uni(&p);			/* Get a character */
        if (uc == 0xFFFFFFFF) return FR_INVALID_NAME;		/* Invalid code or UTF decode error */
        if (uc >= 0x10000) lfn[di++] = (WCHAR)(uc >> 16);	/* Store high surrogate if needed */
        wc = (WCHAR)uc;
        if (wc < ' ' || wc == '/' || wc == '\\') break;	/* Break if end of the path or a separator is found */
        if (wc < 0x80 && chk_chr("\"*:<>\?|\x7F", wc)) return FR_INVALID_NAME;	/* Reject illegal characters for LFN */
        if (di >= FF_MAX_LFN) return FR_INVALID_NAME;	/* Reject too long name */
        lfn[di++] = wc;					/* Store the Unicode character */
    }
    if (wc < ' ') {				/* End of path? */
        cf = NS_LAST;			/* Set last segment flag */
    } else {
        cf = 0;					/* Next segment follows */
        while (*p == '/' || *p == '\\') p++;	/* Skip duplicated separators if exist */
    }
    *path = p;					/* Return pointer to the next segment */

#if FF_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 */
        wc = lfn[di - 1];
        if (wc != ' ' && wc != '.') break;
        di--;
    }
    lfn[di] = 0;							/* LFN is created into the working buffer */
    if (di == 0) return FR_INVALID_NAME;	/* Reject null name */

    /* Create SFN in directory form */
    for (si = 0; lfn[si] == ' '; si++) ;	/* Remove leading spaces */
    if (si > 0 || lfn[si] == '.') cf |= NS_LOSS | NS_LFN;	/* Is there any leading space or dot? */
    while (di > 0 && lfn[di - 1] != '.') di--;	/* Find last dot (di<=si: no extension) */

    mem_set(dp->fn, ' ', 11);
    i = b = 0; ni = 8;
    for (;;) {
        wc = lfn[si++];					/* Get an LFN character */
        if (wc == 0) break;				/* Break on end of the LFN */
        if (wc == ' ' || (wc == '.' && si != di)) {	/* Remove embedded spaces and dots */
            cf |= NS_LOSS | NS_LFN;
            continue;
        }

        if (i >= ni || si == di) {		/* End of field? */
            if (ni == 11) {				/* Name extension overflow? */
                cf |= NS_LOSS | NS_LFN;
                break;
            }
            if (si != di) cf |= NS_LOSS | NS_LFN;	/* Name body overflow? */
            if (si > di) break;						/* No name extension? */
            si = di; i = 8; ni = 11; b <<= 2;		/* Enter name extension */
            continue;
        }

        if (wc >= 0x80) {	/* Is this a non-ASCII character? */
            cf |= NS_LFN;	/* LFN entry needs to be created */
#if FF_CODE_PAGE == 0
            if (ExCvt) {	/* At SBCS */
                wc = ff_uni2oem(wc, CODEPAGE);			/* Unicode ==> ANSI/OEM code */
                if (wc & 0x80) wc = ExCvt[wc & 0x7F];	/* Convert extended character to upper (SBCS) */
            } else {		/* At DBCS */
                wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE);	/* Unicode ==> Upper convert ==> ANSI/OEM code */
            }
#elif FF_CODE_PAGE < 900	/* SBCS cfg */
            wc = ff_uni2oem(wc, CODEPAGE);			/* Unicode ==> ANSI/OEM code */
            if (wc & 0x80) wc = ExCvt[wc & 0x7F];	/* Convert extended character to upper (SBCS) */
#else						/* DBCS cfg */
            wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE);	/* Unicode ==> Upper convert ==> ANSI/OEM code */
#endif
        }

        if (wc >= 0x100) {				/* Is this a DBC? */
            if (i >= ni - 1) {			/* Field overflow? */
                cf |= NS_LOSS | NS_LFN;
                i = ni; continue;		/* Next field */
            }
            dp->fn[i++] = (BYTE)(wc >> 8);	/* Put 1st byte */
        } else {						/* SBC */
            if (wc == 0 || chk_chr("+,;=[]", wc)) {	/* Replace illegal characters for SFN if needed */
                wc = '_'; cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
            } else {
                if (IsUpper(wc)) {		/* ASCII upper case? */
                    b |= 2;
                }
                if (IsLower(wc)) {		/* ASCII lower case? */
                    b |= 1; wc -= 0x20;
                }
            }
        }
        dp->fn[i++] = (BYTE)wc;
    }

    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;				/* Shift capital flags if no extension */
    if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03) cf |= NS_LFN;	/* LFN entry needs to be created if composite capitals */
    if (!(cf & NS_LFN)) {				/* When LFN is in 8.3 format without extended character, NT flags are created */
        if (b & 0x01) cf |= NS_EXT;		/* NT flag (Extension has small capital letters only) */
        if (b & 0x04) cf |= NS_BODY;	/* NT flag (Body has small capital letters only) */
    }

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

    return FR_OK;


#else	/* FF_USE_LFN : 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 FF_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++];				/* Get a byte */
        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 field overflow? */
            if (ni == 11 || c != '.') return FR_INVALID_NAME;	/* Field overflow or invalid dot? */
            i = 8; ni = 11;				/* Enter file extension field */
            continue;
        }
#if FF_CODE_PAGE == 0
        if (ExCvt && c >= 0x80) {		/* Is SBC extended character? */
            c = ExCvt[c & 0x7F];		/* To upper SBC extended character */
        }
#elif FF_CODE_PAGE < 900
        if (c >= 0x80) {				/* Is SBC extended character? */
            c = ExCvt[c & 0x7F];		/* To upper SBC extended character */
        }
#endif
        if (dbc_1st(c)) {				/* Check if it is a DBC 1st byte */
            d = (BYTE)p[si++];			/* Get 2nd byte */
            if (!dbc_2nd(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 /* FF_USE_LFN */
}




/*-----------------------------------------------------------------------*/
/* 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;
    FATFS *fs = dp->obj.fs;


#if FF_FS_RPATH != 0
    if (*path != '/' && *path != '\\') {	/* Without heading separator */
        dp->obj.sclust = fs->cdir;				/* Start from current directory */
    } else
#endif
    {										/* With heading separator */
        while (*path == '/' || *path == '\\') path++;	/* Strip heading separator */
        dp->obj.sclust = 0;					/* Start from root directory */
    }
#if FF_FS_EXFAT
    dp->obj.n_frag = 0;	/* Invalidate last fragment counter of the object */
#if FF_FS_RPATH != 0
    if (fs->fs_type == FS_EXFAT && dp->obj.sclust) {	/* exFAT: Retrieve the sub-directory's status */
        DIR dj;

        dp->obj.c_scl = fs->cdc_scl;
        dp->obj.c_size = fs->cdc_size;
        dp->obj.c_ofs = fs->cdc_ofs;
        res = load_obj_xdir(&dj, &dp->obj);
        if (res != FR_OK) return res;
        dp->obj.objsize = ld_dword(fs->dirbuf + XDIR_FileSize);
        dp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
    }
#endif
#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 (FF_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 (!(dp->obj.attr & AM_DIR)) {		/* It is not a sub-directory and cannot follow */
                res = FR_NO_PATH; break;
            }
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {		/* Save containing directory information for next dir */
                dp->obj.c_scl = dp->obj.sclust;
                dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
                dp->obj.c_ofs = dp->blk_ofs;
                init_alloc_info(fs, &dp->obj);	/* Open next directory */
            } else
#endif
            {
                dp->obj.sclust = ld_clust(fs, fs->win + dp->dptr % SS(fs));	/* Open next directory */
            }
        }
    }

    return res;
}




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

static int get_ldnumber (	/* Returns logical drive number (-1:invalid drive number or null pointer) */
    const TCHAR** path		/* Pointer to pointer to the path name */
)
{
    const TCHAR *tp, *tt;
    TCHAR tc;
    int i, vol = -1;
#if FF_STR_VOLUME_ID		/* Find string volume ID */
    const char *sp;
    char c;
#endif

    tt = tp = *path;
    if (!tp) return vol;	/* Invalid path name? */
    do tc = *tt++; while ((UINT)tc >= (FF_USE_LFN ? ' ' : '!') && tc != ':');	/* Find a colon in the path */

    if (tc == ':') {	/* DOS/Windows style volume ID? */
        i = FF_VOLUMES;
        if (IsDigit(*tp) && tp + 2 == tt) {	/* Is there a numeric volume ID + colon? */
            i = (int)*tp - '0';	/* Get the LD number */
        }
#if FF_STR_VOLUME_ID == 1	/* Arbitrary string is enabled */
        else {
            i = 0;
            do {
                sp = VolumeStr[i]; tp = *path;	/* This string volume ID and path name */
                do {	/* Compare the volume ID with path name */
                    c = *sp++; tc = *tp++;
                    if (IsLower(c)) c -= 0x20;
                    if (IsLower(tc)) tc -= 0x20;
                } while (c && (TCHAR)c == tc);
            } while ((c || tp != tt) && ++i < FF_VOLUMES);	/* Repeat for each id until pattern match */
        }
#endif
        if (i < FF_VOLUMES) {	/* If a volume ID is found, get the drive number and strip it */
            vol = i;		/* Drive number */
            *path = tt;		/* Snip the drive prefix off */
        }
        return vol;
    }
#if FF_STR_VOLUME_ID == 2		/* Unix style volume ID is enabled */
    if (*tp == '/') {
        i = 0;
        do {
            sp = VolumeStr[i]; tp = *path;	/* This string volume ID and path name */
            do {	/* Compare the volume ID with path name */
                c = *sp++; tc = *(++tp);
                if (IsLower(c)) c -= 0x20;
                if (IsLower(tc)) tc -= 0x20;
            } while (c && (TCHAR)c == tc);
        } while ((c || (tc != '/' && (UINT)tc >= (FF_USE_LFN ? ' ' : '!'))) && ++i < FF_VOLUMES);	/* Repeat for each ID until pattern match */
        if (i < FF_VOLUMES) {	/* If a volume ID is found, get the drive number and strip it */
            vol = i;		/* Drive number */
            *path = tp;		/* Snip the drive prefix off */
            return vol;
        }
    }
#endif
    /* No drive prefix is found */
#if FF_FS_RPATH != 0
    vol = CurrVol;	/* Default drive is current drive */
#else
    vol = 0;		/* Default drive is 0 */
#endif
    return vol;		/* Return the default drive */
}




/*-----------------------------------------------------------------------*/
/* GPT support functions                                                 */
/*-----------------------------------------------------------------------*/

#if FF_LBA64

/* Calculate CRC32 in byte-by-byte */

static DWORD crc32 (	/* Returns next CRC value */
    DWORD crc,			/* Current CRC value */
    BYTE d				/* A byte to be processed */
)
{
    BYTE b;


    for (b = 1; b; b <<= 1) {
        crc ^= (d & b) ? 1 : 0;
        crc = (crc & 1) ? crc >> 1 ^ 0xEDB88320 : crc >> 1;
    }
    return crc;
}


/* Check validity of GPT header */

static int test_gpt_header (	/* 0:Invalid, 1:Valid */
    const BYTE* gpth			/* Pointer to the GPT header */
)
{
    UINT i;
    DWORD bcc;


    if (mem_cmp(gpth + GPTH_Sign, "EFI PART" "\0\0\1\0" "\x5C\0\0", 16)) return 0;	/* Check sign, version (1.0) and length (92) */
    for (i = 0, bcc = 0xFFFFFFFF; i < 92; i++) {		/* Check header BCC */
        bcc = crc32(bcc, i - GPTH_Bcc < 4 ? 0 : gpth[i]);
    }
    if (~bcc != ld_dword(gpth + GPTH_Bcc)) return 0;
    if (ld_dword(gpth + GPTH_PteSize) != SZ_GPTE) return 0;	/* Table entry size (must be SZ_GPTE bytes) */
    if (ld_dword(gpth + GPTH_PtNum) > 128) return 0;	/* Table size (must be 128 entries or less) */

    return 1;
}

#if !FF_FS_READONLY && FF_USE_MKFS

/* Generate random value */
static DWORD make_rand (
    DWORD seed,		/* Seed value */
    BYTE* buff,		/* Output buffer */
    UINT n			/* Data length */
)
{
    UINT r;


    if (seed == 0) seed = 1;
    do {
        for (r = 0; r < 8; r++) seed = seed & 1 ? seed >> 1 ^ 0xA3000000 : seed >> 1;	/* Shift 8 bits the 32-bit LFSR */
        *buff++ = (BYTE)seed;
    } while (--n);
    return seed;
}

#endif
#endif



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

/* Check what the sector is */

static UINT check_fs (	/* 0:FAT VBR, 1:exFAT VBR, 2:Not FAT and valid BS, 3:Not FAT and invalid BS, 4:Disk error */
    FATFS* fs,			/* Filesystem object */
    LBA_t sect			/* Sector to load and check if it is an FAT-VBR or not */
)
{
    WORD w, sign;
    BYTE b;


    fs->wflag = 0; fs->winsect = (LBA_t)0 - 1;		/* Invaidate window */
    if (move_window(fs, sect) != FR_OK) return 4;	/* Load the boot sector */
    sign = ld_word(fs->win + BS_55AA);
#if FF_FS_EXFAT
    if (sign == 0xAA55 && !mem_cmp(fs->win + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11)) return 1;	/* It is an exFAT VBR */
#endif
    b = fs->win[BS_JmpBoot];
    if (b == 0xEB || b == 0xE9 || b == 0xE8) {	/* Valid JumpBoot code? (short jump, near jump or near call) */
        if (sign == 0xAA55 && !mem_cmp(fs->win + BS_FilSysType32, "FAT32   ", 8)) return 0;	/* It is an FAT32 VBR */
        /* FAT volumes formatted with early MS-DOS lack boot signature and FAT string, so that we need to identify the FAT VBR without them. */
        w = ld_word(fs->win + BPB_BytsPerSec);
        if ((w & (w - 1)) == 0 && w >= FF_MIN_SS && w <= FF_MAX_SS) {	/* Properness of sector size */
            b = fs->win[BPB_SecPerClus];
            if (b != 0 && (b & (b - 1)) == 0						/* Properness of cluster size */
            && (fs->win[BPB_NumFATs] == 1 || fs->win[BPB_NumFATs] == 2)	/* Properness of number of FATs */
            && ld_word(fs->win + BPB_RootEntCnt) != 0				/* Properness of root entry count */
            && ld_word(fs->win + BPB_FATSz16) != 0) {				/* Properness of FAT size */
                return 0;	/* Sector can be presumed an FAT VBR */
            }
        }
    }
    return sign == 0xAA55 ? 2 : 3;	/* Not an FAT VBR (valid or invalid BS) */
}


/* Find an FAT volume */
/* (It supports only generic partitioning rules, MBR, GPT and SFD) */

static UINT find_volume (	/* Returns BS status found in the hosting drive */
    FATFS* fs,		/* Filesystem object */
    UINT part		/* Partition to fined = 0:auto, 1..:forced */
)
{
    UINT fmt, i;
    DWORD mbr_pt[4];


    fmt = check_fs(fs, 0);				/* Load sector 0 and check if it is an FAT VBR as SFD */
    if (fmt != 2 && (fmt >= 3 || part == 0)) return fmt;	/* Returns if it is a FAT VBR as auto scan, not a BS or disk error */

    /* Sector 0 is not an FAT VBR or forced partition number wants a partition */

#if FF_LBA64
    if (fs->win[MBR_Table + PTE_System] == 0xEE) {	/* GPT protective MBR? */
        DWORD n_ent, v_ent, ofs;
        QWORD pt_lba;

        if (move_window(fs, 1) != FR_OK) return 4;	/* Load GPT header sector (next to MBR) */
        if (!test_gpt_header(fs->win)) return 3;	/* Check if GPT header is valid */
        n_ent = ld_dword(fs->win + GPTH_PtNum);		/* Number of entries */
        pt_lba = ld_qword(fs->win + GPTH_PtOfs);	/* Table location */
        for (v_ent = i = 0; i < n_ent; i++) {		/* Find FAT partition */
            if (move_window(fs, pt_lba + i * SZ_GPTE / SS(fs)) != FR_OK) return 4;	/* PT sector */
            ofs = i * SZ_GPTE % SS(fs);												/* Offset in the sector */
            if (!mem_cmp(fs->win + ofs + GPTE_PtGuid, GUID_MS_Basic, 16)) {	/* MS basic data partition? */
                v_ent++;
                fmt = check_fs(fs, ld_qword(fs->win + ofs + GPTE_FstLba));	/* Load VBR and check status */
                if (part == 0 && fmt <= 1) return fmt;			/* Auto search (valid FAT volume found first) */
                if (part != 0 && v_ent == part) return fmt;		/* Forced partition order (regardless of it is valid or not) */
            }
        }
        return 3;	/* Not found */
    }
#endif
    if (FF_MULTI_PARTITION && part > 4) return 3;	/* MBR has 4 partitions max */
    for (i = 0; i < 4; i++) {		/* Load partition offset in the MBR */
        mbr_pt[i] = ld_dword(fs->win + MBR_Table + i * SZ_PTE + PTE_StLba);
    }
    i = part ? part - 1 : 0;		/* Table index to find first */
    do {							/* Find an FAT volume */
        fmt = mbr_pt[i] ? check_fs(fs, mbr_pt[i]) : 3;	/* Check if the partition is FAT */
    } while (part == 0 && fmt >= 2 && ++i < 4);
    return fmt;
}




/*-----------------------------------------------------------------------*/
/* Determine logical drive number and mount the volume if needed         */
/*-----------------------------------------------------------------------*/

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


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

    /* Check if the filesystem object is valid or not */
    fs = FatFs[vol];					/* Get pointer to the filesystem object */
    if (!fs) return FR_NOT_ENABLED;		/* Is the filesystem object available? */
#if FF_FS_REENTRANT
    if (!lock_fs(fs)) return FR_TIMEOUT;	/* Lock the volume */
#endif
    *rfs = fs;							/* Return pointer to the filesystem object */

    mode &= (BYTE)~FA_READ;				/* Desired access mode, write access or not */
    if (fs->fs_type != 0) {				/* If the volume has been mounted */
        stat = disk_status(fs->pdrv);
        if (!(stat & STA_NOINIT)) {		/* and the physical drive is kept initialized */
            if (!FF_FS_READONLY && mode && (stat & STA_PROTECT)) {	/* Check write protection if needed */
                return FR_WRITE_PROTECTED;
            }
            return FR_OK;				/* The filesystem object is already valid */
        }
    }

    /* The filesystem object is not valid. */
    /* Following code attempts to mount the volume. (find a FAT volume, analyze the BPB and initialize the filesystem object) */

    fs->fs_type = 0;					/* Clear the filesystem object */
    fs->pdrv = LD2PD(vol);				/* Volume hosting physical drive */
    stat = disk_initialize(fs->pdrv);	/* 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 (!FF_FS_READONLY && mode && (stat & STA_PROTECT)) { /* Check disk write protection if needed */
        return FR_WRITE_PROTECTED;
    }
#if FF_MAX_SS != FF_MIN_SS				/* Get sector size (multiple sector size cfg only) */
    if (disk_ioctl(fs->pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK) return FR_DISK_ERR;
    if (SS(fs) > FF_MAX_SS || SS(fs) < FF_MIN_SS || (SS(fs) & (SS(fs) - 1))) return FR_DISK_ERR;
#endif

    /* Find an FAT volume on the drive */
    fmt = find_volume(fs, LD2PT(vol));
    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 */
    bsect = fs->winsect;					/* Volume location */

    /* An FAT volume is found (bsect). Following code initializes the filesystem object */

#if FF_FS_EXFAT
    if (fmt == 1) {
        QWORD maxlba;
        DWORD so, cv, bcl, i;

        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 version (must be version 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 (!FF_LBA64 && 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);

        /* Get bitmap location and check if it is contiguous (implementation assumption) */
        so = i = 0;
        for (;;) {	/* Find the bitmap entry in the root directory (in only first cluster) */
            if (i == 0) {
                if (so >= fs->csize) return FR_NO_FILESYSTEM;	/* Not found? */
                if (move_window(fs, clst2sect(fs, (DWORD)fs->dirbase) + so) != FR_OK) return FR_DISK_ERR;
                so++;
            }
            if (fs->win[i] == ET_BITMAP) break;				/* Is it a bitmap entry? */
            i = (i + SZDIRE) % SS(fs);	/* Next entry */
        }
        bcl = ld_dword(fs->win + i + 20);					/* Bitmap cluster */
        if (bcl < 2 || bcl >= fs->n_fatent) return FR_NO_FILESYSTEM;
        fs->bitbase = fs->database + fs->csize * (bcl - 2);	/* Bitmap sector */
        for (;;) {	/* Check if bitmap is contiguous */
            if (move_window(fs, fs->fatbase + bcl / (SS(fs) / 4)) != FR_OK) return FR_DISK_ERR;
            cv = ld_dword(fs->win + bcl % (SS(fs) / 4) * 4);
            if (cv == 0xFFFFFFFF) break;				/* Last link? */
            if (cv != ++bcl) return FR_NO_FILESYSTEM;	/* Fragmented? */
        }

#if !FF_FS_READONLY
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;		/* Initialize cluster allocation information */
#endif
        fmt = FS_EXFAT;			/* FAT sub-type */
    } else
#endif	/* FF_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 = 0;
        if (nclst <= MAX_FAT32) fmt = FS_FAT32;
        if (nclst <= MAX_FAT16) fmt = FS_FAT16;
        if (nclst <= MAX_FAT12) fmt = FS_FAT12;
        if (fmt == 0) return FR_NO_FILESYSTEM;

        /* 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 != 0) 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 !FF_FS_READONLY
        /* Get FSInfo if available */
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;		/* Initialize cluster allocation information */
        fs->fsi_flag = 0x80;
#if (FF_FS_NOFSINFO & 3) != 3
        if (fmt == FS_FAT32				/* Allow to update FSInfo only if 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 (FF_FS_NOFSINFO & 1) == 0
                fs->free_clst = ld_dword(fs->win + FSI_Free_Count);
#endif
#if (FF_FS_NOFSINFO & 2) == 0
                fs->last_clst = ld_dword(fs->win + FSI_Nxt_Free);
#endif
            }
        }
#endif	/* (FF_FS_NOFSINFO & 3) != 3 */
#endif	/* !FF_FS_READONLY */
    }

    fs->fs_type = (BYTE)fmt;/* FAT sub-type */
    fs->id = ++Fsid;		/* Volume mount ID */
#if FF_USE_LFN == 1
    fs->lfnbuf = LfnBuf;	/* Static LFN working buffer */
#if FF_FS_EXFAT
    fs->dirbuf = DirBuf;	/* Static directory block scratchpad buuffer */
#endif
#endif
#if FF_FS_RPATH != 0
    fs->cdir = 0;			/* Initialize current directory */
#endif
#if FF_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 */
    FFOBJID* obj,			/* Pointer to the FFOBJID, the 1st member in the FIL/DIR object, to check validity */
    FATFS** rfs				/* Pointer to pointer to the owner filesystem object to return */
)
{
    FRESULT res = FR_INVALID_OBJECT;


    if (obj && obj->fs && obj->fs->fs_type && obj->id == obj->fs->id) {	/* Test if the object is valid */
#if FF_FS_REENTRANT
        if (lock_fs(obj->fs)) {	/* Obtain the filesystem object */
            if (!(disk_status(obj->fs->pdrv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
                res = FR_OK;
            } else {
                unlock_fs(obj->fs, FR_OK);
            }
        } else {
            res = FR_TIMEOUT;
        }
#else
        if (!(disk_status(obj->fs->pdrv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
            res = FR_OK;
        }
#endif
    }
    *rfs = (res == FR_OK) ? obj->fs : 0;	/* Corresponding filesystem object */
    return res;
}




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

   Public Functions (FatFs API)

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



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

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


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

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

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

    if (opt == 0) return FR_OK;			/* Do not mount now, it will be mounted later */

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




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

FRESULT f_open (
    FIL* fp,			/* Pointer to the blank file object */
    const TCHAR* path,	/* Pointer to the file name */
    BYTE mode			/* Access mode and file open mode flags */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
#if !FF_FS_READONLY
    DWORD cl, bcs, clst,  tm;
    LBA_t sc;
    FSIZE_t ofs;
#endif
    DEF_NAMBUF


    if (!fp) return FR_INVALID_OBJECT;

    /* Get logical drive number */
    mode &= FF_FS_READONLY ? FA_READ : FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_CREATE_NEW | FA_OPEN_ALWAYS | FA_OPEN_APPEND;
    res = mount_volume(&path, &fs, mode);
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);	/* Follow the file path */
#if !FF_FS_READONLY	/* Read/Write configuration */
        if (res == FR_OK) {
            if (dj.fn[NSFLAG] & NS_NONAME) {	/* Origin directory itself? */
                res = FR_INVALID_NAME;
            }
#if FF_FS_LOCK != 0
            else {
                res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);		/* Check if the file can be used */
            }
#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 FF_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 with the same name 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 the file if overwrite mode */
#if FF_FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {
                    /* Get current allocation info */
                    fp->obj.fs = fs;
                    init_alloc_info(fs, &fp->obj);
                    /* Set directory entry block initial state */
                    mem_set(fs->dirbuf + 2, 0, 30);		/* Clear 85 entry except for NumSec */
                    mem_set(fs->dirbuf + 38, 0, 26);	/* Clear C0 entry except for NumName and NameHash */
                    fs->dirbuf[XDIR_Attr] = AM_ARC;
                    st_dword(fs->dirbuf + XDIR_CrtTime, GET_FATTIME());
                    fs->dirbuf[XDIR_GenFlags] = 1;
                    res = store_xdir(&dj);
                    if (res == FR_OK && fp->obj.sclust != 0) {	/* 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
                {
                    /* Set directory entry initial state */
                    tm = GET_FATTIME();					/* Set created time */
                    st_dword(dj.dir + DIR_CrtTime, tm);
                    st_dword(dj.dir + DIR_ModTime, tm);
                    cl = ld_clust(fs, dj.dir);			/* Get current cluster chain */
                    dj.dir[DIR_Attr] = AM_ARC;			/* Reset attribute */
                    st_clust(fs, dj.dir, 0);			/* Reset file allocation info */
                    st_dword(dj.dir + DIR_FileSize, 0);
                    fs->wflag = 1;
                    if (cl != 0) {						/* Remove the cluster chain if exist */
                        sc = fs->winsect;
                        res = remove_chain(&dj.obj, cl, 0);
                        if (res == FR_OK) {
                            res = move_window(fs, sc);
                            fs->last_clst = cl - 1;		/* Reuse the cluster hole */
                        }
                    }
                }
            }
        }
        else {	/* Open an existing file */
            if (res == FR_OK) {					/* Is the object exsiting? */
                if (dj.obj.attr & AM_DIR) {		/* File open against a directory */
                    res = FR_NO_FILE;
                } else {
                    if ((mode & FA_WRITE) && (dj.obj.attr & AM_RDO)) { /* Write mode open against R/O file */
                        res = FR_DENIED;
                    }
                }
            }
        }
        if (res == FR_OK) {
            if (mode & FA_CREATE_ALWAYS) mode |= FA_MODIFIED;	/* Set file change flag if created or overwritten */
            fp->dir_sect = fs->winsect;			/* Pointer to the directory entry */
            fp->dir_ptr = dj.dir;
#if FF_FS_LOCK != 0
            fp->obj.lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);	/* Lock the file for this session */
            if (fp->obj.lockid == 0) res = FR_INT_ERR;
#endif
        }
#else		/* R/O configuration */
        if (res == FR_OK) {
            if (dj.fn[NSFLAG] & NS_NONAME) {	/* Is it origin directory itself? */
                res = FR_INVALID_NAME;
            } else {
                if (dj.obj.attr & AM_DIR) {		/* Is it a directory? */
                    res = FR_NO_FILE;
                }
            }
        }
#endif

        if (res == FR_OK) {
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                fp->obj.c_scl = dj.obj.sclust;							/* Get containing directory info */
                fp->obj.c_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
                fp->obj.c_ofs = dj.blk_ofs;
                init_alloc_info(fs, &fp->obj);
            } else
#endif
            {
                fp->obj.sclust = ld_clust(fs, dj.dir);					/* Get object allocation info */
                fp->obj.objsize = ld_dword(dj.dir + DIR_FileSize);
            }
#if FF_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 !FF_FS_READONLY
#if !FF_FS_TINY
            mem_set(fp->buf, 0, sizeof fp->buf);	/* 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 */
                    sc = clst2sect(fs, clst);
                    if (sc == 0) {
                        res = FR_INT_ERR;
                    } else {
                        fp->sect = sc + (DWORD)(ofs / SS(fs));
#if !FF_FS_TINY
                        if (disk_read(fs->pdrv, 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;
    LBA_t 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 btr bytes read */
        btr -= rcnt, *br += rcnt, rbuff += rcnt, fp->fptr += 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 FF_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 = clst2sect(fs, fp->clust);	/* Get current sector */
            if (sect == 0) ABORT(fs, FR_INT_ERR);
            sect += csect;
            cc = btr / SS(fs);					/* When remaining bytes >= sector size, */
            if (cc > 0) {						/* Read maximum contiguous sectors directly */
                if (csect + cc > fs->csize) {	/* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if (disk_read(fs->pdrv, rbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if !FF_FS_READONLY && FF_FS_MINIMIZE <= 2		/* Replace one of the read sectors with cached data if it contains a dirty sector */
#if FF_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 !FF_FS_TINY
            if (fp->sect != sect) {			/* Load data sector if not in cache */
#if !FF_FS_READONLY
                if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
                    if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                    fp->flag &= (BYTE)~FA_DIRTY;
                }
#endif
                if (disk_read(fs->pdrv, 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 remains in the sector */
        if (rcnt > btr) rcnt = btr;					/* Clip it by btr if needed */
#if FF_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 !FF_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;
    LBA_t 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 4 GiB at FAT volume) */
    if ((!FF_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 */
        btw -= wcnt, *bw += wcnt, wbuff += wcnt, fp->fptr += wcnt, fp->obj.objsize = (fp->fptr > fp->obj.objsize) ? fp->fptr : fp->obj.objsize) {
        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 FF_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 FF_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->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            sect = clst2sect(fs, fp->clust);	/* Get current sector */
            if (sect == 0) ABORT(fs, FR_INT_ERR);
            sect += csect;
            cc = btw / SS(fs);				/* When remaining bytes >= sector size, */
            if (cc > 0) {					/* Write maximum contiguous sectors directly */
                if (csect + cc > fs->csize) {	/* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if (disk_write(fs->pdrv, wbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if FF_FS_MINIMIZE <= 2
#if FF_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;
                }
#endif
#endif
                wcnt = SS(fs) * cc;		/* Number of bytes transferred */
                continue;
            }
#if FF_FS_TINY
            if (fp->fptr >= fp->obj.objsize) {	/* Avoid silly cache filling on the growing edge */
                if (sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);
                fs->winsect = sect;
            }
#else
            if (fp->sect != sect && 		/* Fill sector cache with file data */
                fp->fptr < fp->obj.objsize &&
                disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) {
                    ABORT(fs, FR_DISK_ERR);
            }
#endif
            fp->sect = sect;
        }
        wcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes remains in the sector */
        if (wcnt > btw) wcnt = btw;					/* Clip it by btw if needed */
#if FF_FS_TINY
        if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window */
        mem_cpy(fs->win + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
        fs->wflag = 1;
#else
        mem_cpy(fp->buf + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
        fp->flag |= FA_DIRTY;
#endif
    }

    fp->flag |= FA_MODIFIED;				/* Set file change flag */

    LEAVE_FF(fs, FR_OK);
}




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

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


    res = validate(&fp->obj, &fs);	/* Check validity of the file object */
    if (res == FR_OK) {
        if (fp->flag & FA_MODIFIED) {	/* Is there any change to the file? */
#if !FF_FS_TINY
            if (fp->flag & FA_DIRTY) {	/* Write-back cached data if needed */
                if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) LEAVE_FF(fs, FR_DISK_ERR);
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            /* Update the directory entry */
            tm = GET_FATTIME();				/* Modified time */
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                res = fill_first_frag(&fp->obj);	/* Fill first fragment on the FAT if needed */
                if (res == FR_OK) {
                    res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);	/* Fill last fragment on the FAT if needed */
                }
                if (res == FR_OK) {
                    DIR dj;
                    DEF_NAMBUF

                    INIT_NAMBUF(fs);
                    res = load_obj_xdir(&dj, &fp->obj);	/* Load directory entry block */
                    if (res == FR_OK) {
                        fs->dirbuf[XDIR_Attr] |= AM_ARC;				/* Set archive attribute to indicate that the file has been changed */
                        fs->dirbuf[XDIR_GenFlags] = fp->obj.stat | 1;	/* Update file allocation information */
                        st_dword(fs->dirbuf + XDIR_FstClus, fp->obj.sclust);		/* Update start cluster */
                        st_qword(fs->dirbuf + XDIR_FileSize, fp->obj.objsize);		/* Update file size */
                        st_qword(fs->dirbuf + XDIR_ValidFileSize, fp->obj.objsize);	/* (FatFs does not support Valid File Size feature) */
                        st_dword(fs->dirbuf + XDIR_ModTime, tm);		/* Update modified time */
                        fs->dirbuf[XDIR_ModTime10] = 0;
                        st_dword(fs->dirbuf + XDIR_AccTime, 0);
                        res = store_xdir(&dj);	/* Restore it to the directory */
                        if (res == FR_OK) {
                            res = sync_fs(fs);
                            fp->flag &= (BYTE)~FA_MODIFIED;
                        }
                    }
                    FREE_NAMBUF();
                }
            } else
#endif
            {
                res = move_window(fs, fp->dir_sect);
                if (res == FR_OK) {
                    dir = fp->dir_ptr;
                    dir[DIR_Attr] |= AM_ARC;						/* Set archive attribute to indicate that the file has been changed */
                    st_clust(fp->obj.fs, dir, fp->obj.sclust);		/* Update file allocation information  */
                    st_dword(dir + DIR_FileSize, (DWORD)fp->obj.objsize);	/* Update file size */
                    st_dword(dir + DIR_ModTime, tm);				/* Update modified time */
                    st_word(dir + DIR_LstAccDate, 0);
                    fs->wflag = 1;
                    res = sync_fs(fs);					/* Restore it to the directory */
                    fp->flag &= (BYTE)~FA_MODIFIED;
                }
            }
        }
    }

    LEAVE_FF(fs, res);
}

#endif /* !FF_FS_READONLY */




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

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

#if !FF_FS_READONLY
    res = f_sync(fp);					/* Flush cached data */
    if (res == FR_OK)
#endif
    {
        res = validate(&fp->obj, &fs);	/* Lock volume */
        if (res == FR_OK) {
#if FF_FS_LOCK != 0
            res = dec_lock(fp->obj.lockid);		/* Decrement file open counter */
            if (res == FR_OK) fp->obj.fs = 0;	/* Invalidate file object */
#else
            fp->obj.fs = 0;	/* Invalidate file object */
#endif
#if FF_FS_REENTRANT
            unlock_fs(fs, FR_OK);		/* Unlock volume */
#endif
        }
    }
    return res;
}




#if FF_FS_RPATH >= 1
/*-----------------------------------------------------------------------*/
/* Change Current Directory or Current Drive, Get Current Directory      */
/*-----------------------------------------------------------------------*/

FRESULT f_chdrive (
    const TCHAR* path		/* Drive number to set */
)
{
    int vol;


    /* Get logical drive number */
    vol = get_ldnumber(&path);
    if (vol < 0) return FR_INVALID_DRIVE;
    CurrVol = (BYTE)vol;	/* Set it as current volume */

    return FR_OK;
}



FRESULT f_chdir (
    const TCHAR* path	/* Pointer to the directory path */
)
{
#if FF_STR_VOLUME_ID == 2
    UINT i;
#endif
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF


    /* Get logical drive */
    res = mount_volume(&path, &fs, 0);
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);		/* Follow the path */
        if (res == FR_OK) {					/* Follow completed */
            if (dj.fn[NSFLAG] & NS_NONAME) {	/* Is it the start directory itself? */
                fs->cdir = dj.obj.sclust;
#if FF_FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {
                    fs->cdc_scl = dj.obj.c_scl;
                    fs->cdc_size = dj.obj.c_size;
                    fs->cdc_ofs = dj.obj.c_ofs;
                }
#endif
            } else {
                if (dj.obj.attr & AM_DIR) {	/* It is a sub-directory */
#if FF_FS_EXFAT
                    if (fs->fs_type == FS_EXFAT) {
                        fs->cdir = ld_dword(fs->dirbuf + XDIR_FstClus);		/* Sub-directory cluster */
                        fs->cdc_scl = dj.obj.sclust;						/* Save containing directory information */
                        fs->cdc_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
                        fs->cdc_ofs = dj.blk_ofs;
                    } else
#endif
                    {
                        fs->cdir = ld_clust(fs, dj.dir);					/* Sub-directory cluster */
                    }
                } else {
                    res = FR_NO_PATH;		/* Reached but a file */
                }
            }
        }
        FREE_NAMBUF();
        if (res == FR_NO_FILE) res = FR_NO_PATH;
#if FF_STR_VOLUME_ID == 2	/* Also current drive is changed at Unix style volume ID */
        if (res == FR_OK) {
            for (i = FF_VOLUMES - 1; i && fs != FatFs[i]; i--) ;	/* Set current drive */
            CurrVol = (BYTE)i;
        }
#endif
    }

    LEAVE_FF(fs, res);
}


#if FF_FS_RPATH >= 2
FRESULT f_getcwd (
    TCHAR* buff,	/* Pointer to the directory path */
    UINT len		/* Size of buff in unit of TCHAR */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    UINT i, n;
    DWORD ccl;
    TCHAR *tp = buff;
#if FF_VOLUMES >= 2
    UINT vl;
#if FF_STR_VOLUME_ID
    const char *vp;
#endif
#endif
    FILINFO fno;
    DEF_NAMBUF


    /* Get logical drive */
    buff[0] = 0;	/* Set null string to get current volume */
    res = mount_volume((const TCHAR**)&buff, &fs, 0);	/* Get current volume */
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);

        /* Follow parent directories and create the path */
        i = len;			/* Bottom of buffer (directory stack base) */
        if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {	/* (Cannot do getcwd on exFAT and returns root path) */
            dj.obj.sclust = fs->cdir;				/* Start to follow upper directory from current directory */
            while ((ccl = dj.obj.sclust) != 0) {	/* Repeat while current directory is a sub-directory */
                res = dir_sdi(&dj, 1 * SZDIRE);	/* Get parent directory */
                if (res != FR_OK) break;
                res = move_window(fs, dj.sect);
                if (res != FR_OK) break;
                dj.obj.sclust = ld_clust(fs, dj.dir);	/* Goto parent directory */
                res = dir_sdi(&dj, 0);
                if (res != FR_OK) break;
                do {							/* Find the entry links to the child directory */
                    res = DIR_READ_FILE(&dj);
                    if (res != FR_OK) break;
                    if (ccl == ld_clust(fs, dj.dir)) break;	/* Found the entry */
                    res = dir_next(&dj, 0);
                } while (res == FR_OK);
                if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
                if (res != FR_OK) break;
                get_fileinfo(&dj, &fno);		/* Get the directory name and push it to the buffer */
                for (n = 0; fno.fname[n]; n++) ;	/* Name length */
                if (i < n + 1) {	/* Insufficient space to store the path name? */
                    res = FR_NOT_ENOUGH_CORE; break;
                }
                while (n) buff[--i] = fno.fname[--n];	/* Stack the name */
                buff[--i] = '/';
            }
        }
        if (res == FR_OK) {
            if (i == len) buff[--i] = '/';	/* Is it the root-directory? */
#if FF_VOLUMES >= 2			/* Put drive prefix */
            vl = 0;
#if FF_STR_VOLUME_ID >= 1	/* String volume ID */
            for (n = 0, vp = (const char*)VolumeStr[CurrVol]; vp[n]; n++) ;
            if (i >= n + 2) {
                if (FF_STR_VOLUME_ID == 2) *tp++ = (TCHAR)'/';
                for (vl = 0; vl < n; *tp++ = (TCHAR)vp[vl], vl++) ;
                if (FF_STR_VOLUME_ID == 1) *tp++ = (TCHAR)':';
                vl++;
            }
#else						/* Numeric volume ID */
            if (i >= 3) {
                *tp++ = (TCHAR)'0' + CurrVol;
                *tp++ = (TCHAR)':';
                vl = 2;
            }
#endif
            if (vl == 0) res = FR_NOT_ENOUGH_CORE;
#endif
            /* Add current directory path */
            if (res == FR_OK) {
                do *tp++ = buff[i++]; while (i < len);	/* Copy stacked path string */
            }
        }
        FREE_NAMBUF();
    }

    *tp = 0;
    LEAVE_FF(fs, res);
}

#endif /* FF_FS_RPATH >= 2 */
#endif /* FF_FS_RPATH >= 1 */



#if FF_FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File Read/Write Pointer                                          */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek (
    FIL* fp,		/* Pointer to the file object */
    FSIZE_t ofs		/* File pointer from top of file */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD clst, bcs;
    LBA_t nsect;
    FSIZE_t ifptr;
#if FF_USE_FASTSEEK
    DWORD cl, pcl, ncl, tcl, tlen, ulen, *tbl;
    LBA_t dsc;
#endif

    res = validate(&fp->obj, &fs);		/* Check validity of the file object */
    if (res == FR_OK) res = (FRESULT)fp->err;
#if FF_FS_EXFAT && !FF_FS_READONLY
    if (res == FR_OK && fs->fs_type == FS_EXFAT) {
        res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);	/* Fill last fragment on the FAT if needed */
    }
#endif
    if (res != FR_OK) LEAVE_FF(fs, res);

#if FF_USE_FASTSEEK
    if (fp->cltbl) {	/* Fast seek */
        if (ofs == CREATE_LINKMAP) {	/* Create CLMT */
            tbl = fp->cltbl;
            tlen = *tbl++; ulen = 2;	/* Given table size and required table size */
            cl = fp->obj.sclust;		/* Origin of the chain */
            if (cl != 0) {
                do {
                    /* Get a fragment */
                    tcl = cl; ncl = 0; ulen += 2;	/* Top, length and used items */
                    do {
                        pcl = cl; ncl++;
                        cl = get_fat(&fp->obj, cl);
                        if (cl <= 1) ABORT(fs, FR_INT_ERR);
                        if (cl == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                    } while (cl == pcl + 1);
                    if (ulen <= tlen) {		/* Store the length and top of the fragment */
                        *tbl++ = ncl; *tbl++ = tcl;
                    }
                } while (cl < fs->n_fatent);	/* Repeat until end of chain */
            }
            *fp->cltbl = ulen;	/* Number of items used */
            if (ulen <= tlen) {
                *tbl = 0;		/* Terminate table */
            } else {
                res = FR_NOT_ENOUGH_CORE;	/* Given table size is smaller than required */
            }
        } else {						/* Fast seek */
            if (ofs > fp->obj.objsize) ofs = fp->obj.objsize;	/* Clip offset at the file size */
            fp->fptr = ofs;				/* Set file pointer */
            if (ofs > 0) {
                fp->clust = clmt_clust(fp, ofs - 1);
                dsc = clst2sect(fs, fp->clust);
                if (dsc == 0) ABORT(fs, FR_INT_ERR);
                dsc += (DWORD)((ofs - 1) / SS(fs)) & (fs->csize - 1);
                if (fp->fptr % SS(fs) && dsc != fp->sect) {	/* Refill sector cache if needed */
#if !FF_FS_TINY
#if !FF_FS_READONLY
                    if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
                        if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                        fp->flag &= (BYTE)~FA_DIRTY;
                    }
#endif
                    if (disk_read(fs->pdrv, fp->buf, dsc, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);	/* Load current sector */
#endif
                    fp->sect = dsc;
                }
            }
        }
    } else
#endif

    /* Normal Seek */
    {
#if FF_FS_EXFAT
        if (fs->fs_type != FS_EXFAT && ofs >= 0x100000000) ofs = 0xFFFFFFFF;	/* Clip at 4 GiB - 1 if at FATxx */
#endif
        if (ofs > fp->obj.objsize && (FF_FS_READONLY || !(fp->flag & FA_WRITE))) {	/* In read-only mode, clip offset with the file size */
            ofs = fp->obj.objsize;
        }
        ifptr = fp->fptr;
        fp->fptr = nsect = 0;
        if (ofs > 0) {
            bcs = (DWORD)fs->csize * SS(fs);	/* Cluster size (byte) */
            if (ifptr > 0 &&
                (ofs - 1) / bcs >= (ifptr - 1) / bcs) {	/* When seek to same or following cluster, */
                fp->fptr = (ifptr - 1) & ~(FSIZE_t)(bcs - 1);	/* start from the current cluster */
                ofs -= fp->fptr;
                clst = fp->clust;
            } else {									/* When seek to back cluster, */
                clst = fp->obj.sclust;					/* start from the first cluster */
#if !FF_FS_READONLY
                if (clst == 0) {						/* If no cluster chain, create a new chain */
                    clst = create_chain(&fp->obj, 0);
                    if (clst == 1) ABORT(fs, FR_INT_ERR);
                    if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                    fp->obj.sclust = clst;
                }
#endif
                fp->clust = clst;
            }
            if (clst != 0) {
                while (ofs > bcs) {						/* Cluster following loop */
                    ofs -= bcs; fp->fptr += bcs;
#if !FF_FS_READONLY
                    if (fp->flag & FA_WRITE) {			/* Check if in write mode or not */
                        if (FF_FS_EXFAT && fp->fptr > fp->obj.objsize) {	/* No FAT chain object needs correct objsize to generate FAT value */
                            fp->obj.objsize = fp->fptr;
                            fp->flag |= FA_MODIFIED;
                        }
                        clst = create_chain(&fp->obj, clst);	/* Follow chain with forceed stretch */
                        if (clst == 0) {				/* Clip file size in case of disk full */
                            ofs = 0; break;
                        }
                    } else
#endif
                    {
                        clst = get_fat(&fp->obj, clst);	/* Follow cluster chain if not in write mode */
                    }
                    if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                    if (clst <= 1 || clst >= fs->n_fatent) ABORT(fs, FR_INT_ERR);
                    fp->clust = clst;
                }
                fp->fptr += ofs;
                if (ofs % SS(fs)) {
                    nsect = clst2sect(fs, clst);	/* Current sector */
                    if (nsect == 0) ABORT(fs, FR_INT_ERR);
                    nsect += (DWORD)(ofs / SS(fs));
                }
            }
        }
        if (!FF_FS_READONLY && fp->fptr > fp->obj.objsize) {	/* Set file change flag if the file size is extended */
            fp->obj.objsize = fp->fptr;
            fp->flag |= FA_MODIFIED;
        }
        if (fp->fptr % SS(fs) && nsect != fp->sect) {	/* Fill sector cache if needed */
#if !FF_FS_TINY
#if !FF_FS_READONLY
            if (fp->flag & FA_DIRTY) {			/* Write-back dirty sector cache */
                if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            if (disk_read(fs->pdrv, fp->buf, nsect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);	/* Fill sector cache */
#endif
            fp->sect = nsect;
        }
    }

    LEAVE_FF(fs, res);
}



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

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


    if (!dp) return FR_INVALID_OBJECT;

    /* Get logical drive */
    res = mount_volume(&path, &fs, 0);
    if (res == FR_OK) {
        dp->obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(dp, path);			/* Follow the path to the directory */
        if (res == FR_OK) {						/* Follow completed */
            if (!(dp->fn[NSFLAG] & NS_NONAME)) {	/* It is not the origin directory itself */
                if (dp->obj.attr & AM_DIR) {		/* This object is a sub-directory */
#if FF_FS_EXFAT
                    if (fs->fs_type == FS_EXFAT) {
                        dp->obj.c_scl = dp->obj.sclust;							/* Get containing directory inforamation */
                        dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
                        dp->obj.c_ofs = dp->blk_ofs;
                        init_alloc_info(fs, &dp->obj);	/* Get object allocation info */
                    } else
#endif
                    {
                        dp->obj.sclust = ld_clust(fs, dp->dir);	/* Get object allocation info */
                    }
                } else {						/* This object is a file */
                    res = FR_NO_PATH;
                }
            }
            if (res == FR_OK) {
                dp->obj.id = fs->id;
                res = dir_sdi(dp, 0);			/* Rewind directory */
#if FF_FS_LOCK != 0
                if (res == FR_OK) {
                    if (dp->obj.sclust != 0) {
                        dp->obj.lockid = inc_lock(dp, 0);	/* Lock the sub directory */
                        if (!dp->obj.lockid) res = FR_TOO_MANY_OPEN_FILES;
                    } else {
                        dp->obj.lockid = 0;	/* Root directory need not to be locked */
                    }
                }
#endif
            }
        }
        FREE_NAMBUF();
        if (res == FR_NO_FILE) res = FR_NO_PATH;
    }
    if (res != FR_OK) dp->obj.fs = 0;		/* Invalidate the directory object if function faild */

    LEAVE_FF(fs, res);
}




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

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


    res = validate(&dp->obj, &fs);	/* Check validity of the file object */
    if (res == FR_OK) {
#if FF_FS_LOCK != 0
        if (dp->obj.lockid) res = dec_lock(dp->obj.lockid);	/* Decrement sub-directory open counter */
        if (res == FR_OK) dp->obj.fs = 0;	/* Invalidate directory object */
#else
        dp->obj.fs = 0;	/* Invalidate directory object */
#endif
#if FF_FS_REENTRANT
        unlock_fs(fs, FR_OK);		/* Unlock volume */
#endif
    }
    return res;
}




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

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


    res = validate(&dp->obj, &fs);	/* Check validity of the directory object */
    if (res == FR_OK) {
        if (!fno) {
            res = dir_sdi(dp, 0);			/* Rewind the directory object */
        } else {
            INIT_NAMBUF(fs);
            res = DIR_READ_FILE(dp);		/* Read an item */
            if (res == FR_NO_FILE) res = FR_OK;	/* Ignore end of directory */
            if (res == FR_OK) {				/* A valid entry is found */
                get_fileinfo(dp, fno);		/* Get the object information */
                res = dir_next(dp, 0);		/* Increment index for next */
                if (res == FR_NO_FILE) res = FR_OK;	/* Ignore end of directory now */
            }
            FREE_NAMBUF();
        }
    }
    LEAVE_FF(fs, res);
}



#if FF_USE_FIND
/*-----------------------------------------------------------------------*/
/* Find Next File                                                        */
/*-----------------------------------------------------------------------*/

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


    for (;;) {
        res = f_readdir(dp, fno);		/* Get a directory item */
        if (res != FR_OK || !fno || !fno->fname[0]) break;	/* Terminate if any error or end of directory */
        if (pattern_match(dp->pat, fno->fname, 0, FIND_RECURS)) break;		/* Test for the file name */
#if FF_USE_LFN && FF_USE_FIND == 2
        if (pattern_match(dp->pat, fno->altname, 0, FIND_RECURS)) break;	/* Test for alternative name if exist */
#endif
    }
    return res;
}



/*-----------------------------------------------------------------------*/
/* Find First File                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_findfirst (
    DIR* dp,				/* Pointer to the blank directory object */
    FILINFO* fno,			/* Pointer to the file information structure */
    const TCHAR* path,		/* Pointer to the directory to open */
    const TCHAR* pattern	/* Pointer to the matching pattern */
)
{
    FRESULT res;


    dp->pat = pattern;		/* Save pointer to pattern string */
    res = f_opendir(dp, path);		/* Open the target directory */
    if (res == FR_OK) {
        res = f_findnext(dp, fno);	/* Find the first item */
    }
    return res;
}

#endif	/* FF_USE_FIND */



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

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


    /* Get logical drive */
    res = mount_volume(&path, &dj.obj.fs, 0);
    if (res == FR_OK) {
        INIT_NAMBUF(dj.obj.fs);
        res = follow_path(&dj, path);	/* Follow the file path */
        if (res == FR_OK) {				/* Follow completed */
            if (dj.fn[NSFLAG] & NS_NONAME) {	/* It is origin directory */
                res = FR_INVALID_NAME;
            } else {							/* Found an object */
                if (fno) get_fileinfo(&dj, fno);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(dj.obj.fs, res);
}



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

FRESULT f_getfree (
    const TCHAR* path,	/* Logical drive number */
    DWORD* nclst,		/* Pointer to a variable to return number of free clusters */
    FATFS** fatfs		/* Pointer to return pointer to corresponding filesystem object */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD nfree, clst, stat;
    LBA_t sect;
    UINT i;
    FFOBJID obj;


    /* Get logical drive */
    res = mount_volume(&path, &fs, 0);
    if (res == FR_OK) {
        *fatfs = fs;				/* Return ptr to the fs object */
        /* If free_clst is valid, return it without full FAT scan */
        if (fs->free_clst <= fs->n_fatent - 2) {
            *nclst = fs->free_clst;
        } else {
            /* Scan FAT to obtain number of free clusters */
            nfree = 0;
            if (fs->fs_type == FS_FAT12) {	/* FAT12: Scan bit field FAT entries */
                clst = 2; obj.fs = fs;
                do {
                    stat = get_fat(&obj, clst);
                    if (stat == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
                    if (stat == 1) { res = FR_INT_ERR; break; }
                    if (stat == 0) nfree++;
                } while (++clst < fs->n_fatent);
            } else {
#if FF_FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {	/* exFAT: Scan allocation bitmap */
                    BYTE bm;
                    UINT b;

                    clst = fs->n_fatent - 2;	/* Number of clusters */
                    sect = fs->bitbase;			/* Bitmap sector */
                    i = 0;						/* Offset in the sector */
                    do {	/* Counts numbuer of bits with zero in the bitmap */
                        if (i == 0) {
                            res = move_window(fs, sect++);
                            if (res != FR_OK) break;
                        }
                        for (b = 8, bm = fs->win[i]; b && clst; b--, clst--) {
                            if (!(bm & 1)) nfree++;
                            bm >>= 1;
                        }
                        i = (i + 1) % SS(fs);
                    } while (clst);
                } else
#endif
                {	/* FAT16/32: Scan WORD/DWORD FAT entries */
                    clst = fs->n_fatent;	/* Number of entries */
                    sect = fs->fatbase;		/* Top of the FAT */
                    i = 0;					/* Offset in the sector */
                    do {	/* Counts numbuer of entries with zero in the FAT */
                        if (i == 0) {
                            res = move_window(fs, sect++);
                            if (res != FR_OK) break;
                        }
                        if (fs->fs_type == FS_FAT16) {
                            if (ld_word(fs->win + i) == 0) nfree++;
                            i += 2;
                        } else {
                            if ((ld_dword(fs->win + i) & 0x0FFFFFFF) == 0) nfree++;
                            i += 4;
                        }
                        i %= SS(fs);
                    } while (--clst);
                }
            }
            *nclst = nfree;			/* Return the free clusters */
            fs->free_clst = nfree;	/* Now free_clst is valid */
            fs->fsi_flag |= 1;		/* FAT32: FSInfo is to be updated */
        }
    }

    LEAVE_FF(fs, res);
}




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

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


    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);
    if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */

    if (fp->fptr < fp->obj.objsize) {	/* Process when fptr is not on the eof */
        if (fp->fptr == 0) {	/* When set file size to zero, remove entire cluster chain */
            res = remove_chain(&fp->obj, fp->obj.sclust, 0);
            fp->obj.sclust = 0;
        } else {				/* When truncate a part of the file, remove remaining clusters */
            ncl = get_fat(&fp->obj, fp->clust);
            res = FR_OK;
            if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
            if (ncl == 1) res = FR_INT_ERR;
            if (res == FR_OK && ncl < fs->n_fatent) {
                res = remove_chain(&fp->obj, ncl, fp->clust);
            }
        }
        fp->obj.objsize = fp->fptr;	/* Set file size to current read/write point */
        fp->flag |= FA_MODIFIED;
#if !FF_FS_TINY
        if (res == FR_OK && (fp->flag & FA_DIRTY)) {
            if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                res = FR_DISK_ERR;
            } else {
                fp->flag &= (BYTE)~FA_DIRTY;
            }
        }
#endif
        if (res != FR_OK) ABORT(fs, res);
    }

    LEAVE_FF(fs, res);
}




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

FRESULT f_unlink (
    const TCHAR* path		/* Pointer to the file or directory path */
)
{
    FRESULT res;
    DIR dj, sdj;
    DWORD dclst = 0;
    FATFS *fs;
#if FF_FS_EXFAT
    FFOBJID obj;
#endif
    DEF_NAMBUF


    /* Get logical drive */
    res = mount_volume(&path, &fs, FA_WRITE);
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);		/* Follow the file path */
        if (FF_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT)) {
            res = FR_INVALID_NAME;			/* Cannot remove dot entry */
        }
#if FF_FS_LOCK != 0
        if (res == FR_OK) res = chk_lock(&dj, 2);	/* Check if it is an open object */
#endif
        if (res == FR_OK) {					/* The object is accessible */
            if (dj.fn[NSFLAG] & NS_NONAME) {
                res = FR_INVALID_NAME;		/* Cannot remove the origin directory */
            } else {
                if (dj.obj.attr & AM_RDO) {
                    res = FR_DENIED;		/* Cannot remove R/O object */
                }
            }
            if (res == FR_OK) {
#if FF_FS_EXFAT
                obj.fs = fs;
                if (fs->fs_type == FS_EXFAT) {
                    init_alloc_info(fs, &obj);
                    dclst = obj.sclust;
                } else
#endif
                {
                    dclst = ld_clust(fs, dj.dir);
                }
                if (dj.obj.attr & AM_DIR) {			/* Is it a sub-directory? */
#if FF_FS_RPATH != 0
                    if (dclst == fs->cdir) {		 	/* Is it the current directory? */
                        res = FR_DENIED;
                    } else
#endif
                    {
                        sdj.obj.fs = fs;				/* Open the sub-directory */
                        sdj.obj.sclust = dclst;
#if FF_FS_EXFAT
                        if (fs->fs_type == FS_EXFAT) {
                            sdj.obj.objsize = obj.objsize;
                            sdj.obj.stat = obj.stat;
                        }
#endif
                        res = dir_sdi(&sdj, 0);
                        if (res == FR_OK) {
                            res = DIR_READ_FILE(&sdj);			/* Test if the directory is empty */
                            if (res == FR_OK) res = FR_DENIED;	/* Not empty? */
                            if (res == FR_NO_FILE) res = FR_OK;	/* Empty? */
                        }
                    }
                }
            }
            if (res == FR_OK) {
                res = dir_remove(&dj);			/* Remove the directory entry */
                if (res == FR_OK && dclst != 0) {	/* Remove the cluster chain if exist */
#if FF_FS_EXFAT
                    res = remove_chain(&obj, dclst, 0);
#else
                    res = remove_chain(&dj.obj, dclst, 0);
#endif
                }
                if (res == FR_OK) res = sync_fs(fs);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




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

FRESULT f_mkdir (
    const TCHAR* path		/* Pointer to the directory path */
)
{
    FRESULT res;
    DIR dj;
    FFOBJID sobj;
    FATFS *fs;
    DWORD dcl, pcl, tm;
    DEF_NAMBUF


    res = mount_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);			/* Follow the file path */
        if (res == FR_OK) res = FR_EXIST;		/* Name collision? */
        if (FF_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT)) {	/* Invalid name? */
            res = FR_INVALID_NAME;
        }
        if (res == FR_NO_FILE) {				/* It is clear to create a new directory */
            sobj.fs = fs;						/* New object id to create a new chain */
            dcl = create_chain(&sobj, 0);		/* Allocate a cluster for the new directory */
            res = FR_OK;
            if (dcl == 0) res = FR_DENIED;		/* No space to allocate a new cluster? */
            if (dcl == 1) res = FR_INT_ERR;		/* Any insanity? */
            if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;	/* Disk error? */
            tm = GET_FATTIME();
            if (res == FR_OK) {
                res = dir_clear(fs, dcl);		/* Clean up the new table */
                if (res == FR_OK) {
                    if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {	/* Create dot entries (FAT only) */
                        mem_set(fs->win + DIR_Name, ' ', 11);	/* Create "." entry */
                        fs->win[DIR_Name] = '.';
                        fs->win[DIR_Attr] = AM_DIR;
                        st_dword(fs->win + DIR_ModTime, tm);
                        st_clust(fs, fs->win, dcl);
                        mem_cpy(fs->win + SZDIRE, fs->win, SZDIRE); /* Create ".." entry */
                        fs->win[SZDIRE + 1] = '.'; pcl = dj.obj.sclust;
                        st_clust(fs, fs->win + SZDIRE, pcl);
                        fs->wflag = 1;
                    }
                    res = dir_register(&dj);	/* Register the object to the parent directoy */
                }
            }
            if (res == FR_OK) {
#if FF_FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {	/* Initialize directory entry block */
                    st_dword(fs->dirbuf + XDIR_ModTime, tm);	/* Created time */
                    st_dword(fs->dirbuf + XDIR_FstClus, dcl);	/* Table start cluster */
                    st_dword(fs->dirbuf + XDIR_FileSize, (DWORD)fs->csize * SS(fs));	/* Directory size needs to be valid */
                    st_dword(fs->dirbuf + XDIR_ValidFileSize, (DWORD)fs->csize * SS(fs));
                    fs->dirbuf[XDIR_GenFlags] = 3;				/* Initialize the object flag */
                    fs->dirbuf[XDIR_Attr] = AM_DIR;				/* Attribute */
                    res = store_xdir(&dj);
                } else
#endif
                {
                    st_dword(dj.dir + DIR_ModTime, tm);	/* Created time */
                    st_clust(fs, dj.dir, dcl);			/* Table start cluster */
                    dj.dir[DIR_Attr] = AM_DIR;			/* Attribute */
                    fs->wflag = 1;
                }
                if (res == FR_OK) {
                    res = sync_fs(fs);
                }
            } else {
                remove_chain(&sobj, dcl, 0);		/* Could not register, remove the allocated cluster */
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




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

FRESULT f_rename (
    const TCHAR* path_old,	/* Pointer to the object name to be renamed */
    const TCHAR* path_new	/* Pointer to the new name */
)
{
    FRESULT res;
    DIR djo, djn;
    FATFS *fs;
    BYTE buf[FF_FS_EXFAT ? SZDIRE * 2 : SZDIRE], *dir;
    LBA_t sect;
    DEF_NAMBUF


    get_ldnumber(&path_new);						/* Snip the drive number of new name off */
    res = mount_volume(&path_old, &fs, FA_WRITE);	/* Get logical drive of the old object */
    if (res == FR_OK) {
        djo.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&djo, path_old);		/* Check old object */
        if (res == FR_OK && (djo.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check validity of name */
#if FF_FS_LOCK != 0
        if (res == FR_OK) {
            res = chk_lock(&djo, 2);
        }
#endif
        if (res == FR_OK) {						/* Object to be renamed is found */
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {	/* At exFAT volume */
                BYTE nf, nn;
                WORD nh;

                mem_cpy(buf, fs->dirbuf, SZDIRE * 2);	/* Save 85+C0 entry of old object */
                mem_cpy(&djn, &djo, sizeof djo);
                res = follow_path(&djn, path_new);		/* Make sure if new object name is not in use */
                if (res == FR_OK) {						/* Is new name already in use by any other object? */
                    res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
                }
                if (res == FR_NO_FILE) { 				/* It is a valid path and no name collision */
                    res = dir_register(&djn);			/* Register the new entry */
                    if (res == FR_OK) {
                        nf = fs->dirbuf[XDIR_NumSec]; nn = fs->dirbuf[XDIR_NumName];
                        nh = ld_word(fs->dirbuf + XDIR_NameHash);
                        mem_cpy(fs->dirbuf, buf, SZDIRE * 2);	/* Restore 85+C0 entry */
                        fs->dirbuf[XDIR_NumSec] = nf; fs->dirbuf[XDIR_NumName] = nn;
                        st_word(fs->dirbuf + XDIR_NameHash, nh);
                        if (!(fs->dirbuf[XDIR_Attr] & AM_DIR)) fs->dirbuf[XDIR_Attr] |= AM_ARC;	/* Set archive attribute if it is a file */
/* Start of critical section where an interruption can cause a cross-link */
                        res = store_xdir(&djn);
                    }
                }
            } else
#endif
            {	/* At FAT/FAT32 volume */
                mem_cpy(buf, djo.dir, SZDIRE);			/* Save directory entry of the object */
                mem_cpy(&djn, &djo, sizeof (DIR));		/* Duplicate the directory object */
                res = follow_path(&djn, path_new);		/* Make sure if new object name is not in use */
                if (res == FR_OK) {						/* Is new name already in use by any other object? */
                    res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
                }
                if (res == FR_NO_FILE) { 				/* It is a valid path and no name collision */
                    res = dir_register(&djn);			/* Register the new entry */
                    if (res == FR_OK) {
                        dir = djn.dir;					/* Copy directory entry of the object except name */
                        mem_cpy(dir + 13, buf + 13, SZDIRE - 13);
                        dir[DIR_Attr] = buf[DIR_Attr];
                        if (!(dir[DIR_Attr] & AM_DIR)) dir[DIR_Attr] |= AM_ARC;	/* Set archive attribute if it is a file */
                        fs->wflag = 1;
                        if ((dir[DIR_Attr] & AM_DIR) && djo.obj.sclust != djn.obj.sclust) {	/* Update .. entry in the sub-directory if needed */
                            sect = clst2sect(fs, ld_clust(fs, dir));
                            if (sect == 0) {
                                res = FR_INT_ERR;
                            } else {
/* Start of critical section where an interruption can cause a cross-link */
                                res = move_window(fs, sect);
                                dir = fs->win + SZDIRE * 1;	/* Ptr to .. entry */
                                if (res == FR_OK && dir[1] == '.') {
                                    st_clust(fs, dir, djn.obj.sclust);
                                    fs->wflag = 1;
                                }
                            }
                        }
                    }
                }
            }
            if (res == FR_OK) {
                res = dir_remove(&djo);		/* Remove old entry */
                if (res == FR_OK) {
                    res = sync_fs(fs);
                }
            }
/* End of the critical section */
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}

#endif /* !FF_FS_READONLY */
#endif /* FF_FS_MINIMIZE == 0 */
#endif /* FF_FS_MINIMIZE <= 1 */
#endif /* FF_FS_MINIMIZE <= 2 */



#if FF_USE_CHMOD && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Change Attribute                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_chmod (
    const TCHAR* path,	/* Pointer to the file path */
    BYTE attr,			/* Attribute bits */
    BYTE mask			/* Attribute mask to change */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF


    res = mount_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);	/* Follow the file path */
        if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
        if (res == FR_OK) {
            mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;	/* Valid attribute mask */
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                fs->dirbuf[XDIR_Attr] = (attr & mask) | (fs->dirbuf[XDIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
                res = store_xdir(&dj);
            } else
#endif
            {
                dj.dir[DIR_Attr] = (attr & mask) | (dj.dir[DIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
                fs->wflag = 1;
            }
            if (res == FR_OK) {
                res = sync_fs(fs);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




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

FRESULT f_utime (
    const TCHAR* path,	/* Pointer to the file/directory name */
    const FILINFO* fno	/* Pointer to the timestamp to be set */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF


    res = mount_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);	/* Follow the file path */
        if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
        if (res == FR_OK) {
#if FF_FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                st_dword(fs->dirbuf + XDIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
                res = store_xdir(&dj);
            } else
#endif
            {
                st_dword(dj.dir + DIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
                fs->wflag = 1;
            }
            if (res == FR_OK) {
                res = sync_fs(fs);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}

#endif	/* FF_USE_CHMOD && !FF_FS_READONLY */



#if FF_USE_LABEL
/*-----------------------------------------------------------------------*/
/* Get Volume Label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_getlabel (
    const TCHAR* path,	/* Logical drive number */
    TCHAR* label,		/* Buffer to store the volume label */
    DWORD* vsn			/* Variable to store the volume serial number */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    UINT si, di;
    WCHAR wc;

    /* Get logical drive */
    res = mount_volume(&path, &fs, 0);

    /* Get volume label */
    if (res == FR_OK && label) {
        dj.obj.fs = fs; dj.obj.sclust = 0;	/* Open root directory */
        res = dir_sdi(&dj, 0);
        if (res == FR_OK) {
             res = DIR_READ_LABEL(&dj);		/* Find a volume label entry */
             if (res == FR_OK) {
#if FF_FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {
                    WCHAR hs;

                    for (si = di = hs = 0; si < dj.dir[XDIR_NumLabel]; si++) {	/* Extract volume label from 83 entry */
                        wc = ld_word(dj.dir + XDIR_Label + si * 2);
                        if (hs == 0 && IsSurrogate(wc)) {	/* Is the code a surrogate? */
                            hs = wc; continue;
                        }
                        wc = put_utf((DWORD)hs << 16 | wc, &label[di], 4);
                        if (wc == 0) { di = 0; break; }
                        di += wc;
                        hs = 0;
                    }
                    if (hs != 0) di = 0;	/* Broken surrogate pair? */
                    label[di] = 0;
                } else
#endif
                {
                    si = di = 0;		/* Extract volume label from AM_VOL entry */
                    while (si < 11) {
                        wc = dj.dir[si++];
#if FF_USE_LFN && FF_LFN_UNICODE >= 1 	/* Unicode output */
                        if (dbc_1st((BYTE)wc) && si < 11) wc = wc << 8 | dj.dir[si++];	/* Is it a DBC? */
                        wc = ff_oem2uni(wc, CODEPAGE);					/* Convert it into Unicode */
                        if (wc != 0) wc = put_utf(wc, &label[di], 4);	/* Put it in Unicode */
                        if (wc == 0) { di = 0; break; }
                        di += wc;
#else									/* ANSI/OEM output */
                        label[di++] = (TCHAR)wc;
#endif
                    }
                    do {				/* Truncate trailing spaces */
                        label[di] = 0;
                        if (di == 0) break;
                    } while (label[--di] == ' ');
                }
            }
        }
        if (res == FR_NO_FILE) {	/* No label entry and return nul string */
            label[0] = 0;
            res = FR_OK;
        }
    }

    /* Get volume serial number */
    if (res == FR_OK && vsn) {
        res = move_window(fs, fs->volbase);
        if (res == FR_OK) {
            switch (fs->fs_type) {
            case FS_EXFAT:
                di = BPB_VolIDEx;
                break;

            case FS_FAT32:
                di = BS_VolID32;
                break;

            default:
                di = BS_VolID;
            }
            *vsn = ld_dword(fs->win + di);
        }
    }

    LEAVE_FF(fs, res);
}



#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Set Volume Label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_setlabel (
    const TCHAR* label	/* Volume label to set with heading logical drive number */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    BYTE dirvn[22];
    UINT di;
    WCHAR wc;
    static const char badchr[] = "+.,;=[]/\\\"*:<>\?|\x7F";	/* [0..] for FAT, [7..] for exFAT */
#if FF_USE_LFN
    DWORD dc;
#endif

    /* Get logical drive */
    res = mount_volume(&label, &fs, FA_WRITE);
    if (res != FR_OK) LEAVE_FF(fs, res);

#if FF_FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
        mem_set(dirvn, 0, 22);
        di = 0;
        while ((UINT)*label >= ' ') {	/* Create volume label */
            dc = tchar2uni(&label);	/* Get a Unicode character */
            if (dc >= 0x10000) {
                if (dc == 0xFFFFFFFF || di >= 10) {	/* Wrong surrogate or buffer overflow */
                    dc = 0;
                } else {
                    st_word(dirvn + di * 2, (WCHAR)(dc >> 16)); di++;
                }
            }
            if (dc == 0 || chk_chr(badchr + 7, (int)dc) || di >= 11) {	/* Check validity of the volume label */
                LEAVE_FF(fs, FR_INVALID_NAME);
            }
            st_word(dirvn + di * 2, (WCHAR)dc); di++;
        }
    } else
#endif
    {	/* On the FAT/FAT32 volume */
        mem_set(dirvn, ' ', 11);
        di = 0;
        while ((UINT)*label >= ' ') {	/* Create volume label */
#if FF_USE_LFN
            dc = tchar2uni(&label);
            wc = (dc < 0x10000) ? ff_uni2oem(ff_wtoupper(dc), CODEPAGE) : 0;
#else									/* ANSI/OEM input */
            wc = (BYTE)*label++;
            if (dbc_1st((BYTE)wc)) wc = dbc_2nd((BYTE)*label) ? wc << 8 | (BYTE)*label++ : 0;
            if (IsLower(wc)) wc -= 0x20;		/* To upper ASCII characters */
#if FF_CODE_PAGE == 0
            if (ExCvt && wc >= 0x80) wc = ExCvt[wc - 0x80];	/* To upper extended characters (SBCS cfg) */
#elif FF_CODE_PAGE < 900
            if (wc >= 0x80) wc = ExCvt[wc - 0x80];	/* To upper extended characters (SBCS cfg) */
#endif
#endif
            if (wc == 0 || chk_chr(badchr + 0, (int)wc) || di >= (UINT)((wc >= 0x100) ? 10 : 11)) {	/* Reject invalid characters for volume label */
                LEAVE_FF(fs, FR_INVALID_NAME);
            }
            if (wc >= 0x100) dirvn[di++] = (BYTE)(wc >> 8);
            dirvn[di++] = (BYTE)wc;
        }
        if (dirvn[0] == DDEM) LEAVE_FF(fs, FR_INVALID_NAME);	/* Reject illegal name (heading DDEM) */
        while (di && dirvn[di - 1] == ' ') di--;				/* Snip trailing spaces */
    }

    /* Set volume label */
    dj.obj.fs = fs; dj.obj.sclust = 0;	/* Open root directory */
    res = dir_sdi(&dj, 0);
    if (res == FR_OK) {
        res = DIR_READ_LABEL(&dj);	/* Get volume label entry */
        if (res == FR_OK) {
            if (FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {
                dj.dir[XDIR_NumLabel] = (BYTE)di;	/* Change the volume label */
                mem_cpy(dj.dir + XDIR_Label, dirvn, 22);
            } else {
                if (di != 0) {
                    mem_cpy(dj.dir, dirvn, 11);	/* Change the volume label */
                } else {
                    dj.dir[DIR_Name] = DDEM;	/* Remove the volume label */
                }
            }
            fs->wflag = 1;
            res = sync_fs(fs);
        } else {			/* No volume label entry or an error */
            if (res == FR_NO_FILE) {
                res = FR_OK;
                if (di != 0) {	/* Create a volume label entry */
                    res = dir_alloc(&dj, 1);	/* Allocate an entry */
                    if (res == FR_OK) {
                        mem_set(dj.dir, 0, SZDIRE);	/* Clean the entry */
                        if (FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {
                            dj.dir[XDIR_Type] = ET_VLABEL;	/* Create volume label entry */
                            dj.dir[XDIR_NumLabel] = (BYTE)di;
                            mem_cpy(dj.dir + XDIR_Label, dirvn, 22);
                        } else {
                            dj.dir[DIR_Attr] = AM_VOL;		/* Create volume label entry */
                            mem_cpy(dj.dir, dirvn, 11);
                        }
                        fs->wflag = 1;
                        res = sync_fs(fs);
                    }
                }
            }
        }
    }

    LEAVE_FF(fs, res);
}

#endif /* !FF_FS_READONLY */
#endif /* FF_USE_LABEL */



#if FF_USE_EXPAND && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Allocate a Contiguous Blocks to the File                              */
/*-----------------------------------------------------------------------*/

FRESULT f_expand (
    FIL* fp,		/* Pointer to the file object */
    FSIZE_t fsz,	/* File size to be expanded to */
    BYTE opt		/* Operation mode 0:Find and prepare or 1:Find and allocate */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD n, clst, stcl, scl, ncl, tcl, lclst;


    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);
    if (fsz == 0 || fp->obj.objsize != 0 || !(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);
#if FF_FS_EXFAT
    if (fs->fs_type != FS_EXFAT && fsz >= 0x100000000) LEAVE_FF(fs, FR_DENIED);	/* Check if in size limit */
#endif
    n = (DWORD)fs->csize * SS(fs);	/* Cluster size */
    tcl = (DWORD)(fsz / n) + ((fsz & (n - 1)) ? 1 : 0);	/* Number of clusters required */
    stcl = fs->last_clst; lclst = 0;
    if (stcl < 2 || stcl >= fs->n_fatent) stcl = 2;

#if FF_FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {
        scl = find_bitmap(fs, stcl, tcl);			/* Find a contiguous cluster block */
        if (scl == 0) res = FR_DENIED;				/* No contiguous cluster block was found */
        if (scl == 0xFFFFFFFF) res = FR_DISK_ERR;
        if (res == FR_OK) {	/* A contiguous free area is found */
            if (opt) {		/* Allocate it now */
                res = change_bitmap(fs, scl, tcl, 1);	/* Mark the cluster block 'in use' */
                lclst = scl + tcl - 1;
            } else {		/* Set it as suggested point for next allocation */
                lclst = scl - 1;
            }
        }
    } else
#endif
    {
        scl = clst = stcl; ncl = 0;
        for (;;) {	/* Find a contiguous cluster block */
            n = get_fat(&fp->obj, clst);
            if (++clst >= fs->n_fatent) clst = 2;
            if (n == 1) { res = FR_INT_ERR; break; }
            if (n == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
            if (n == 0) {	/* Is it a free cluster? */
                if (++ncl == tcl) break;	/* Break if a contiguous cluster block is found */
            } else {
                scl = clst; ncl = 0;		/* Not a free cluster */
            }
            if (clst == stcl) { res = FR_DENIED; break; }	/* No contiguous cluster? */
        }
        if (res == FR_OK) {	/* A contiguous free area is found */
            if (opt) {		/* Allocate it now */
                for (clst = scl, n = tcl; n; clst++, n--) {	/* Create a cluster chain on the FAT */
                    res = put_fat(fs, clst, (n == 1) ? 0xFFFFFFFF : clst + 1);
                    if (res != FR_OK) break;
                    lclst = clst;
                }
            } else {		/* Set it as suggested point for next allocation */
                lclst = scl - 1;
            }
        }
    }

    if (res == FR_OK) {
        fs->last_clst = lclst;		/* Set suggested start cluster to start next */
        if (opt) {	/* Is it allocated now? */
            fp->obj.sclust = scl;		/* Update object allocation information */
            fp->obj.objsize = fsz;
            if (FF_FS_EXFAT) fp->obj.stat = 2;	/* Set status 'contiguous chain' */
            fp->flag |= FA_MODIFIED;
            if (fs->free_clst <= fs->n_fatent - 2) {	/* Update FSINFO */
                fs->free_clst -= tcl;
                fs->fsi_flag |= 1;
            }
        }
    }

    LEAVE_FF(fs, res);
}

#endif /* FF_USE_EXPAND && !FF_FS_READONLY */



#if FF_USE_FORWARD
/*-----------------------------------------------------------------------*/
/* Forward Data to the Stream Directly                                   */
/*-----------------------------------------------------------------------*/

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


    *bf = 0;	/* Clear transfer 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);
    if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */

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

    for ( ;  btf && (*func)(0, 0);					/* Repeat until all data transferred or stream goes busy */
        fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {
        csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));	/* Sector offset in the cluster */
        if (fp->fptr % SS(fs) == 0) {				/* On the sector boundary? */
            if (csect == 0) {						/* On the cluster boundary? */
                clst = (fp->fptr == 0) ?			/* On the top of the file? */
                    fp->obj.sclust : get_fat(&fp->obj, fp->clust);
                if (clst <= 1) ABORT(fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                fp->clust = clst;					/* Update current cluster */
            }
        }
        sect = clst2sect(fs, fp->clust);			/* Get current data sector */
        if (sect == 0) ABORT(fs, FR_INT_ERR);
        sect += csect;
#if FF_FS_TINY
        if (move_window(fs, sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window to the file data */
        dbuf = fs->win;
#else
        if (fp->sect != sect) {		/* Fill sector cache with file data */
#if !FF_FS_READONLY
            if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
                if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            if (disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
        }
        dbuf = fp->buf;
#endif
        fp->sect = sect;
        rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes remains in the sector */
        if (rcnt > btf) rcnt = btf;					/* Clip it by btr if needed */
        rcnt = (*func)(dbuf + ((UINT)fp->fptr % SS(fs)), rcnt);	/* Forward the file data */
        if (rcnt == 0) ABORT(fs, FR_INT_ERR);
    }

    LEAVE_FF(fs, FR_OK);
}
#endif /* FF_USE_FORWARD */



#if !FF_FS_READONLY && FF_USE_MKFS
/*-----------------------------------------------------------------------*/
/* Create FAT/exFAT volume                                               */
/*-----------------------------------------------------------------------*/

#define N_SEC_TRACK 63			/* Sectors per track for determination of drive CHS */
#define	GPT_ALIGN	0x100000	/* Alignment of partitions in GPT [byte] (>=128KB) */
#define GPT_ITEMS	128			/* Number of GPT table size (>=128, sector aligned) */


/* Create partitions on the physical drive in format of MBR or GPT */

static FRESULT create_partition (
    BYTE drv,			/* Physical drive number */
    const LBA_t plst[],	/* Partition list */
    BYTE sys,			/* System ID (for only MBR, temp setting) */
    BYTE* buf			/* Working buffer for a sector */
)
{
    UINT i, cy;
    LBA_t sz_drv;
    DWORD sz_drv32, s_lba32, n_lba32;
    BYTE *pte, hd, n_hd, sc, n_sc;

    /* Get drive size */
    if (disk_ioctl(drv, GET_SECTOR_COUNT, &sz_drv) != RES_OK) return FR_DISK_ERR;

#if FF_LBA64
    if (sz_drv >= FF_MIN_GPT) {	/* Create partitions in GPT */
        WORD ss;
        UINT sz_pt, pi, si, ofs;
        DWORD bcc, rnd, align;
        QWORD s_lba64, n_lba64, sz_pool, s_bpt;
        static const BYTE gpt_mbr[16] = {0x00, 0x00, 0x02, 0x00, 0xEE, 0xFE, 0xFF, 0x00, 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF};

#if FF_MAX_SS != FF_MIN_SS
        if (disk_ioctl(drv, GET_SECTOR_SIZE, &ss) != RES_OK) return FR_DISK_ERR;	/* Get sector size */
        if (ss > FF_MAX_SS || ss < FF_MIN_SS || (ss & (ss - 1))) return FR_DISK_ERR;
#else
        ss = FF_MAX_SS;
#endif
        rnd = GET_FATTIME();			/* Random seed */
        align = GPT_ALIGN / ss;			/* Partition alignment [sector] */
        sz_pt = GPT_ITEMS * SZ_GPTE / ss;	/* Size of PT [sector] */
        s_bpt = sz_drv - sz_pt - 1;		/* Backup PT start sector */
        s_lba64 = 2 + sz_pt;			/* First allocatable sector */
        sz_pool = s_bpt - s_lba64;		/* Size of allocatable area */
        bcc = 0xFFFFFFFF; n_lba64 = 1;
        pi = si = 0;	/* partition table index, size table index */
        do {
            if (pi * SZ_GPTE % ss == 0) mem_set(buf, 0, ss);	/* Clean the buffer if needed */
            if (n_lba64 != 0) {	/* Is the size table not termintated? */
                s_lba64 = (s_lba64 + align - 1) & ((QWORD)0 - align);	/* Align partition start */
                n_lba64 = plst[si++];	/* Get a partition size */
                if (n_lba64 <= 100) {	/* Is the size in percentage? */
                    n_lba64 = sz_pool * n_lba64 / 100;
                    n_lba64 = (n_lba64 + align - 1) & ((QWORD)0 - align);	/* Align partition end (only if in percentage) */
                }
                if (s_lba64 + n_lba64 > s_bpt) {	/* Clip at end of the pool */
                    n_lba64 = (s_lba64 < s_bpt) ? s_bpt - s_lba64 : 0;
                }
            }
            if (n_lba64 != 0) {		/* Add a partition? */
                ofs = pi * SZ_GPTE % ss;
                mem_cpy(buf + ofs + GPTE_PtGuid, GUID_MS_Basic, 16);	/* Partition GUID (Microsoft Basic Data) */
                rnd = make_rand(rnd, buf + ofs + GPTE_UpGuid, 16);		/* Unique partition GUID */
                st_qword(buf + ofs + GPTE_FstLba, s_lba64);				/* Partition start LBA */
                st_qword(buf + ofs + GPTE_LstLba, s_lba64 + n_lba64 - 1);	/* Partition end LBA */
                s_lba64 += n_lba64;		/* Next partition LBA */
            }
            if ((pi + 1) * SZ_GPTE % ss == 0) {		/* Write the buffer if it is filled up */
                for (i = 0; i < ss; bcc = crc32(bcc, buf[i++])) ;	/* Calculate table check sum */
                if (disk_write(drv, buf, 2 + pi * SZ_GPTE / ss, 1) != RES_OK) return FR_DISK_ERR;		/* Primary table */
                if (disk_write(drv, buf, s_bpt + pi * SZ_GPTE / ss, 1) != RES_OK) return FR_DISK_ERR;	/* Secondary table */
            }
        } while (++pi < GPT_ITEMS);

        /* Create primary GPT header */
        mem_set(buf, 0, ss);
        mem_cpy(buf + GPTH_Sign, "EFI PART" "\0\0\1\0" "\x5C\0\0", 16);	/* Signature, version (1.0) and size (92) */
        st_dword(buf + GPTH_PtBcc, ~bcc);				/* Table check sum */
        st_qword(buf + GPTH_CurLba, 1);					/* LBA of this header */
        st_qword(buf + GPTH_BakLba, sz_drv - 1);		/* LBA of another header */
        st_qword(buf + GPTH_FstLba, 2 + sz_pt);			/* LBA of first allocatable sector */
        st_qword(buf + GPTH_LstLba, s_bpt - 1);			/* LBA of last allocatable sector */
        st_dword(buf + GPTH_PteSize, SZ_GPTE);			/* Size of a table entry */
        st_dword(buf + GPTH_PtNum, GPT_ITEMS);			/* Number of table entries */
        st_dword(buf + GPTH_PtOfs, 2);					/* LBA of this table */
        rnd = make_rand(rnd, buf + GPTH_DskGuid, 16);	/* Disk GUID */
        for (i = 0, bcc= 0xFFFFFFFF; i < 92; bcc = crc32(bcc, buf[i++])) ;	/* Calculate header check sum */
        st_dword(buf + GPTH_Bcc, ~bcc);					/* Header check sum */
        if (disk_write(drv, buf, 1, 1) != RES_OK) return FR_DISK_ERR;

        /* Create secondary GPT header */
        st_qword(buf + GPTH_CurLba, sz_drv - 1);		/* LBA of this header */
        st_qword(buf + GPTH_BakLba, 1);					/* LBA of another header */
        st_qword(buf + GPTH_PtOfs, s_bpt);				/* LBA of this table */
        st_dword(buf + GPTH_Bcc, 0);
        for (i = 0, bcc= 0xFFFFFFFF; i < 92; bcc = crc32(bcc, buf[i++])) ;	/* Calculate header check sum */
        st_dword(buf + GPTH_Bcc, ~bcc);					/* Header check sum */
        if (disk_write(drv, buf, sz_drv - 1, 1) != RES_OK) return FR_DISK_ERR;

        /* Create protective MBR */
        mem_set(buf, 0, ss);
        mem_cpy(buf + MBR_Table, gpt_mbr, 16);			/* Create a GPT partition */
        st_word(buf + BS_55AA, 0xAA55);
        if (disk_write(drv, buf, 0, 1) != RES_OK) return FR_DISK_ERR;

    } else
#endif
    {					/* Create partitions in MBR */
        sz_drv32 = (DWORD)sz_drv;
        n_sc = N_SEC_TRACK;		/* Determine drive CHS without any consideration of the drive geometry */
        for (n_hd = 8; n_hd != 0 && sz_drv32 / n_hd / n_sc > 1024; n_hd *= 2) ;
        if (n_hd == 0) n_hd = 255;	/* Number of heads needs to be <256 */

        mem_set(buf, 0, FF_MAX_SS);	/* Clear MBR */
        pte = buf + MBR_Table;	/* Partition table in the MBR */
        for (i = 0, s_lba32 = n_sc; i < 4 && s_lba32 != 0 && s_lba32 < sz_drv32; i++, s_lba32 += n_lba32) {
            n_lba32 = (DWORD)plst[i];	/* Get partition size */
            if (n_lba32 <= 100) n_lba32 = (n_lba32 == 100) ? sz_drv32 : sz_drv32 / 100 * n_lba32;	/* Size in percentage? */
            if (s_lba32 + n_lba32 > sz_drv32 || s_lba32 + n_lba32 < s_lba32) n_lba32 = sz_drv32 - s_lba32;	/* Clip at drive size */
            if (n_lba32 == 0) break;	/* End of table or no sector to allocate? */

            st_dword(pte + PTE_StLba, s_lba32);		/* Start LBA */
            st_dword(pte + PTE_SizLba, n_lba32);	/* Number of sectors */
            pte[PTE_System] = sys;					/* System type */

            cy = (UINT)(s_lba32 / n_sc / n_hd);		/* Start cylinder */
            hd = (BYTE)(s_lba32 / n_sc % n_hd);		/* Start head */
            sc = (BYTE)(s_lba32 % n_sc + 1);		/* Start sector */
            pte[PTE_StHead] = hd;
            pte[PTE_StSec] = (BYTE)((cy >> 2 & 0xC0) | sc);
            pte[PTE_StCyl] = (BYTE)cy;

            cy = (UINT)((s_lba32 + n_lba32 - 1) / n_sc / n_hd);	/* End cylinder */
            hd = (BYTE)((s_lba32 + n_lba32 - 1) / n_sc % n_hd);	/* End head */
            sc = (BYTE)((s_lba32 + n_lba32 - 1) % n_sc + 1);	/* End sector */
            pte[PTE_EdHead] = hd;
            pte[PTE_EdSec] = (BYTE)((cy >> 2 & 0xC0) | sc);
            pte[PTE_EdCyl] = (BYTE)cy;

            pte += SZ_PTE;		/* Next entry */
        }

        st_word(buf + BS_55AA, 0xAA55);		/* MBR signature */
        if (disk_write(drv, buf, 0, 1) != RES_OK) return FR_DISK_ERR;	/* Write it to the MBR */
    }

    return FR_OK;
}



FRESULT f_mkfs (
    const TCHAR* path,		/* Logical drive number */
    const MKFS_PARM* opt,	/* Format options */
    void* work,				/* Pointer to working buffer (null: use heap memory) */
    UINT len				/* Size of working buffer [byte] */
)
{
    static const WORD cst[] = {1, 4, 16, 64, 256, 512, 0};	/* Cluster size boundary for FAT volume (4Ks unit) */
    static const WORD cst32[] = {1, 2, 4, 8, 16, 32, 0};	/* Cluster size boundary for FAT32 volume (128Ks unit) */
    static const MKFS_PARM defopt = {FM_ANY, 0, 0, 0, 0};	/* Default parameter */
    BYTE fsopt, fsty, sys, *buf, *pte, pdrv, ipart;
    WORD ss;	/* Sector size */
    DWORD sz_buf, sz_blk, n_clst, pau, nsect, n;
    LBA_t sz_vol, b_vol, b_fat, b_data;		/* Size of volume, Base LBA of volume, fat, data */
    LBA_t sect, lba[2];
    DWORD sz_rsv, sz_fat, sz_dir, sz_au;	/* Size of reserved, fat, dir, data, cluster */
    UINT n_fat, n_root, i;					/* Index, Number of FATs and Number of roor dir entries */
    int vol;
    DSTATUS ds;
    FRESULT fr;


    /* Check mounted drive and clear work area */
    vol = get_ldnumber(&path);					/* Get target logical drive */
    if (vol < 0) return FR_INVALID_DRIVE;
    if (FatFs[vol]) FatFs[vol]->fs_type = 0;	/* Clear the fs object if mounted */
    pdrv = LD2PD(vol);			/* Physical drive */
    ipart = LD2PT(vol);			/* Partition (0:create as new, 1..:get from partition table) */
    if (!opt) opt = &defopt;	/* Use default parameter if it is not given */

    /* Get physical drive status (sz_drv, sz_blk, ss) */
    ds = disk_initialize(pdrv);
    if (ds & STA_NOINIT) return FR_NOT_READY;
    if (ds & STA_PROTECT) return FR_WRITE_PROTECTED;
    sz_blk = opt->align;
    if (sz_blk == 0 && disk_ioctl(pdrv, GET_BLOCK_SIZE, &sz_blk) != RES_OK) sz_blk = 1;
     if (sz_blk == 0 || sz_blk > 0x8000 || (sz_blk & (sz_blk - 1))) sz_blk = 1;
#if FF_MAX_SS != FF_MIN_SS
    if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &ss) != RES_OK) return FR_DISK_ERR;
    if (ss > FF_MAX_SS || ss < FF_MIN_SS || (ss & (ss - 1))) return FR_DISK_ERR;
#else
    ss = FF_MAX_SS;
#endif
    /* Options for FAT sub-type and FAT parameters */
    fsopt = opt->fmt & (FM_ANY | FM_SFD);
    n_fat = (opt->n_fat >= 1 && opt->n_fat <= 2) ? opt->n_fat : 1;
    n_root = (opt->n_root >= 1 && opt->n_root <= 32768 && (opt->n_root % (ss / SZDIRE)) == 0) ? opt->n_root : 512;
    sz_au = (opt->au_size <= 0x1000000 && (opt->au_size & (opt->au_size - 1)) == 0) ? opt->au_size : 0;
    sz_au /= ss;	/* Byte --> Sector */

    /* Get working buffer */
    sz_buf = len / ss;		/* Size of working buffer [sector] */
    if (sz_buf == 0) return FR_NOT_ENOUGH_CORE;
    buf = (BYTE*)work;		/* Working buffer */
#if FF_USE_LFN == 3
    if (!buf) buf = ff_memalloc(sz_buf * ss);	/* Use heap memory for working buffer */
#endif
    if (!buf) return FR_NOT_ENOUGH_CORE;

    /* Determine where the volume to be located (b_vol, sz_vol) */
    b_vol = sz_vol = 0;
    if (FF_MULTI_PARTITION && ipart != 0) {	/* Is the volume associated with any specific partition? */
        /* Get partition location from the existing partition table */
        if (disk_read(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Load MBR */
        if (ld_word(buf + BS_55AA) != 0xAA55) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if MBR is valid */
#if FF_LBA64
        if (buf[MBR_Table + PTE_System] == 0xEE) {	/* GPT protective MBR? */
            DWORD n_ent, ofs;
            QWORD pt_lba;

            /* Get the partition location from GPT */
            if (disk_read(pdrv, buf, 1, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Load GPT header sector (next to MBR) */
            if (!test_gpt_header(buf)) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if GPT header is valid */
            n_ent = ld_dword(buf + GPTH_PtNum);		/* Number of entries */
            pt_lba = ld_qword(buf + GPTH_PtOfs);	/* Table start sector */
            ofs = i = 0;
            while (n_ent) {		/* Find MS Basic partition with order of ipart */
                if (ofs == 0 && disk_read(pdrv, buf, pt_lba++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Get PT sector */
                if (!mem_cmp(buf + ofs + GPTE_PtGuid, GUID_MS_Basic, 16) && ++i == ipart) {	/* MS basic data partition? */
                    b_vol = ld_qword(buf + ofs + GPTE_FstLba);
                    sz_vol = ld_qword(buf + ofs + GPTE_LstLba) - b_vol + 1;
                    break;
                }
                n_ent--; ofs = (ofs + SZ_GPTE) % ss;	/* Next entry */
            }
            if (n_ent == 0) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Partition not found */
            fsopt |= 0x80;	/* Partitioning is in GPT */
        } else
#endif
        {	/* Get the partition location from MBR partition table */
            pte = buf + (MBR_Table + (ipart - 1) * SZ_PTE);
            if (ipart > 4 || pte[PTE_System] == 0) LEAVE_MKFS(FR_MKFS_ABORTED);	/* No partition? */
            b_vol = ld_dword(pte + PTE_StLba);		/* Get volume start sector */
            sz_vol = ld_dword(pte + PTE_SizLba);	/* Get volume size */
        }
    } else {	/* The volume is associated with a physical drive */
        if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_vol) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        if (!(fsopt & FM_SFD)) {	/* To be partitioned? */
            /* Create a single-partition on the drive in this function */
#if FF_LBA64
            if (sz_vol >= FF_MIN_GPT) {	/* Which partition type to create, MBR or GPT? */
                fsopt |= 0x80;		/* Partitioning is in GPT */
                b_vol = GPT_ALIGN / ss; sz_vol -= b_vol + GPT_ITEMS * SZ_GPTE / ss + 1;	/* Estimated partition offset and size */
            } else
#endif
            {	/* Partitioning is in MBR */
                if (sz_vol > N_SEC_TRACK) {
                    b_vol = N_SEC_TRACK; sz_vol -= b_vol;	/* Estimated partition offset and size */
                }
            }
        }
    }
    if (sz_vol < 128) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if volume size is >=128s */

    /* Now start to create a FAT volume at b_vol and sz_vol */

    do {	/* Pre-determine the FAT type */
        if (FF_FS_EXFAT && (fsopt & FM_EXFAT)) {	/* exFAT possible? */
            if ((fsopt & FM_ANY) == FM_EXFAT || sz_vol >= 0x4000000 || sz_au > 128) {	/* exFAT only, vol >= 64MS or sz_au > 128S ? */
                fsty = FS_EXFAT; break;
            }
        }
#if FF_LBA64
        if (sz_vol >= 0x100000000) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too large volume for FAT/FAT32 */
#endif
        if (sz_au > 128) sz_au = 128;	/* Invalid AU for FAT/FAT32? */
        if (fsopt & FM_FAT32) {	/* FAT32 possible? */
            if (!(fsopt & FM_FAT)) {	/* no-FAT? */
                fsty = FS_FAT32; break;
            }
        }
        if (!(fsopt & FM_FAT)) LEAVE_MKFS(FR_INVALID_PARAMETER);	/* no-FAT? */
        fsty = FS_FAT16;
    } while (0);

#if FF_FS_EXFAT
    if (fsty == FS_EXFAT) {	/* Create an exFAT volume */
        DWORD szb_bit, szb_case, sum, nbit, clu, clen[3];
        WCHAR ch, si;
        UINT j, st;

        if (sz_vol < 0x1000) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume for exFAT? */
#if FF_USE_TRIM
        lba[0] = b_vol; lba[1] = b_vol + sz_vol - 1;	/* Inform storage device that the volume area may be erased */
        disk_ioctl(pdrv, CTRL_TRIM, lba);
#endif
        /* Determine FAT location, data location and number of clusters */
        if (sz_au == 0) {	/* AU auto-selection */
            sz_au = 8;
            if (sz_vol >= 0x80000) sz_au = 64;		/* >= 512Ks */
            if (sz_vol >= 0x4000000) sz_au = 256;	/* >= 64Ms */
        }
        b_fat = b_vol + 32;										/* FAT start at offset 32 */
        sz_fat = (DWORD)((sz_vol / sz_au + 2) * 4 + ss - 1) / ss;	/* Number of FAT sectors */
        b_data = (b_fat + sz_fat + sz_blk - 1) & ~((LBA_t)sz_blk - 1);	/* Align data area to the erase block boundary */
        if (b_data - b_vol >= sz_vol / 2) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume? */
        n_clst = (DWORD)(sz_vol - (b_data - b_vol)) / sz_au;	/* Number of clusters */
        if (n_clst <16) LEAVE_MKFS(FR_MKFS_ABORTED);			/* Too few clusters? */
        if (n_clst > MAX_EXFAT) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too many clusters? */

        szb_bit = (n_clst + 7) / 8;								/* Size of allocation bitmap */
        clen[0] = (szb_bit + sz_au * ss - 1) / (sz_au * ss);	/* Number of allocation bitmap clusters */

        /* Create a compressed up-case table */
        sect = b_data + sz_au * clen[0];	/* Table start sector */
        sum = 0;							/* Table checksum to be stored in the 82 entry */
        st = 0; si = 0; i = 0; j = 0; szb_case = 0;
        do {
            switch (st) {
            case 0:
                ch = (WCHAR)ff_wtoupper(si);	/* Get an up-case char */
                if (ch != si) {
                    si++; break;		/* Store the up-case char if exist */
                }
                for (j = 1; (WCHAR)(si + j) && (WCHAR)(si + j) == ff_wtoupper((WCHAR)(si + j)); j++) ;	/* Get run length of no-case block */
                if (j >= 128) {
                    ch = 0xFFFF; st = 2; break;	/* Compress the no-case block if run is >= 128 chars */
                }
                st = 1;			/* Do not compress short run */
                /* FALLTHROUGH */
            case 1:
                ch = si++;		/* Fill the short run */
                if (--j == 0) st = 0;
                break;

            default:
                ch = (WCHAR)j; si += (WCHAR)j;	/* Number of chars to skip */
                st = 0;
            }
            sum = xsum32(buf[i + 0] = (BYTE)ch, sum);		/* Put it into the write buffer */
            sum = xsum32(buf[i + 1] = (BYTE)(ch >> 8), sum);
            i += 2; szb_case += 2;
            if (si == 0 || i == sz_buf * ss) {		/* Write buffered data when buffer full or end of process */
                n = (i + ss - 1) / ss;
                if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
                sect += n; i = 0;
            }
        } while (si);
        clen[1] = (szb_case + sz_au * ss - 1) / (sz_au * ss);	/* Number of up-case table clusters */
        clen[2] = 1;	/* Number of root dir clusters */

        /* Initialize the allocation bitmap */
        sect = b_data; nsect = (szb_bit + ss - 1) / ss;	/* Start of bitmap and number of bitmap sectors */
        nbit = clen[0] + clen[1] + clen[2];				/* Number of clusters in-use by system (bitmap, up-case and root-dir) */
        do {
            mem_set(buf, 0, sz_buf * ss);				/* Initialize bitmap buffer */
            for (i = 0; nbit != 0 && i / 8 < sz_buf * ss; buf[i / 8] |= 1 << (i % 8), i++, nbit--) ;	/* Mark used clusters */
            n = (nsect > sz_buf) ? sz_buf : nsect;		/* Write the buffered data */
            if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
            sect += n; nsect -= n;
        } while (nsect);

        /* Initialize the FAT */
        sect = b_fat; nsect = sz_fat;	/* Start of FAT and number of FAT sectors */
        j = nbit = clu = 0;
        do {
            mem_set(buf, 0, sz_buf * ss); i = 0;	/* Clear work area and reset write offset */
            if (clu == 0) {	/* Initialize FAT [0] and FAT[1] */
                st_dword(buf + i, 0xFFFFFFF8); i += 4; clu++;
                st_dword(buf + i, 0xFFFFFFFF); i += 4; clu++;
            }
            do {			/* Create chains of bitmap, up-case and root dir */
                while (nbit != 0 && i < sz_buf * ss) {	/* Create a chain */
                    st_dword(buf + i, (nbit > 1) ? clu + 1 : 0xFFFFFFFF);
                    i += 4; clu++; nbit--;
                }
                if (nbit == 0 && j < 3) nbit = clen[j++];	/* Get next chain length */
            } while (nbit != 0 && i < sz_buf * ss);
            n = (nsect > sz_buf) ? sz_buf : nsect;	/* Write the buffered data */
            if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
            sect += n; nsect -= n;
        } while (nsect);

        /* Initialize the root directory */
        mem_set(buf, 0, sz_buf * ss);
        buf[SZDIRE * 0 + 0] = ET_VLABEL;					/* Volume label entry (no label) */
        buf[SZDIRE * 1 + 0] = ET_BITMAP;					/* Bitmap entry */
        st_dword(buf + SZDIRE * 1 + 20, 2);					/*  cluster */
        st_dword(buf + SZDIRE * 1 + 24, szb_bit);			/*  size */
        buf[SZDIRE * 2 + 0] = ET_UPCASE;					/* Up-case table entry */
        st_dword(buf + SZDIRE * 2 + 4, sum);				/*  sum */
        st_dword(buf + SZDIRE * 2 + 20, 2 + clen[0]);		/*  cluster */
        st_dword(buf + SZDIRE * 2 + 24, szb_case);			/*  size */
        sect = b_data + sz_au * (clen[0] + clen[1]); nsect = sz_au;	/* Start of the root directory and number of sectors */
        do {	/* Fill root directory sectors */
            n = (nsect > sz_buf) ? sz_buf : nsect;
            if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
            mem_set(buf, 0, ss);	/* Rest of entries are filled with zero */
            sect += n; nsect -= n;
        } while (nsect);

        /* Create two set of the exFAT VBR blocks */
        sect = b_vol;
        for (n = 0; n < 2; n++) {
            /* Main record (+0) */
            mem_set(buf, 0, ss);
            mem_cpy(buf + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11);	/* Boot jump code (x86), OEM name */
            st_qword(buf + BPB_VolOfsEx, b_vol);					/* Volume offset in the physical drive [sector] */
            st_qword(buf + BPB_TotSecEx, sz_vol);					/* Volume size [sector] */
            st_dword(buf + BPB_FatOfsEx, (DWORD)(b_fat - b_vol));	/* FAT offset [sector] */
            st_dword(buf + BPB_FatSzEx, sz_fat);					/* FAT size [sector] */
            st_dword(buf + BPB_DataOfsEx, (DWORD)(b_data - b_vol));	/* Data offset [sector] */
            st_dword(buf + BPB_NumClusEx, n_clst);					/* Number of clusters */
            st_dword(buf + BPB_RootClusEx, 2 + clen[0] + clen[1]);	/* Root dir cluster # */
            st_dword(buf + BPB_VolIDEx, GET_FATTIME());				/* VSN */
            st_word(buf + BPB_FSVerEx, 0x100);						/* Filesystem version (1.00) */
            for (buf[BPB_BytsPerSecEx] = 0, i = ss; i >>= 1; buf[BPB_BytsPerSecEx]++) ;	/* Log2 of sector size [byte] */
            for (buf[BPB_SecPerClusEx] = 0, i = sz_au; i >>= 1; buf[BPB_SecPerClusEx]++) ;	/* Log2 of cluster size [sector] */
            buf[BPB_NumFATsEx] = 1;					/* Number of FATs */
            buf[BPB_DrvNumEx] = 0x80;				/* Drive number (for int13) */
            st_word(buf + BS_BootCodeEx, 0xFEEB);	/* Boot code (x86) */
            st_word(buf + BS_55AA, 0xAA55);			/* Signature (placed here regardless of sector size) */
            for (i = sum = 0; i < ss; i++) {		/* VBR checksum */
                if (i != BPB_VolFlagEx && i != BPB_VolFlagEx + 1 && i != BPB_PercInUseEx) sum = xsum32(buf[i], sum);
            }
            if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
            /* Extended bootstrap record (+1..+8) */
            mem_set(buf, 0, ss);
            st_word(buf + ss - 2, 0xAA55);	/* Signature (placed at end of sector) */
            for (j = 1; j < 9; j++) {
                for (i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;	/* VBR checksum */
                if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
            }
            /* OEM/Reserved record (+9..+10) */
            mem_set(buf, 0, ss);
            for ( ; j < 11; j++) {
                for (i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;	/* VBR checksum */
                if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
            }
            /* Sum record (+11) */
            for (i = 0; i < ss; i += 4) st_dword(buf + i, sum);		/* Fill with checksum value */
            if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
        }

    } else
#endif	/* FF_FS_EXFAT */
    {	/* Create an FAT/FAT32 volume */
        do {
            pau = sz_au;
            /* Pre-determine number of clusters and FAT sub-type */
            if (fsty == FS_FAT32) {	/* FAT32 volume */
                if (pau == 0) {	/* AU auto-selection */
                    n = (DWORD)sz_vol / 0x20000;	/* Volume size in unit of 128KS */
                    for (i = 0, pau = 1; cst32[i] && cst32[i] <= n; i++, pau <<= 1) ;	/* Get from table */
                }
                n_clst = (DWORD)sz_vol / pau;	/* Number of clusters */
                sz_fat = (n_clst * 4 + 8 + ss - 1) / ss;	/* FAT size [sector] */
                sz_rsv = 32;	/* Number of reserved sectors */
                sz_dir = 0;		/* No static directory */
                if (n_clst <= MAX_FAT16 || n_clst > MAX_FAT32) LEAVE_MKFS(FR_MKFS_ABORTED);
            } else {				/* FAT volume */
                if (pau == 0) {	/* au auto-selection */
                    n = (DWORD)sz_vol / 0x1000;	/* Volume size in unit of 4KS */
                    for (i = 0, pau = 1; cst[i] && cst[i] <= n; i++, pau <<= 1) ;	/* Get from table */
                }
                n_clst = (DWORD)sz_vol / pau;
                if (n_clst > MAX_FAT12) {
                    n = n_clst * 2 + 4;		/* FAT size [byte] */
                } else {
                    fsty = FS_FAT12;
                    n = (n_clst * 3 + 1) / 2 + 3;	/* FAT size [byte] */
                }
                sz_fat = (n + ss - 1) / ss;		/* FAT size [sector] */
                sz_rsv = 1;						/* Number of reserved sectors */
                sz_dir = (DWORD)n_root * SZDIRE / ss;	/* Root dir size [sector] */
            }
            b_fat = b_vol + sz_rsv;						/* FAT base */
            b_data = b_fat + sz_fat * n_fat + sz_dir;	/* Data base */

            /* Align data area to erase block boundary (for flash memory media) */
            n = (DWORD)(((b_data + sz_blk - 1) & ~(sz_blk - 1)) - b_data);	/* Sectors to next nearest from current data base */
            if (fsty == FS_FAT32) {		/* FAT32: Move FAT */
                sz_rsv += n; b_fat += n;
            } else {					/* FAT: Expand FAT */
                if (n % n_fat) {	/* Adjust fractional error if needed */
                    n--; sz_rsv++; b_fat++;
                }
                sz_fat += n / n_fat;
            }

            /* Determine number of clusters and final check of validity of the FAT sub-type */
            if (sz_vol < b_data + pau * 16 - b_vol) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume? */
            n_clst = ((DWORD)sz_vol - sz_rsv - sz_fat * n_fat - sz_dir) / pau;
            if (fsty == FS_FAT32) {
                if (n_clst <= MAX_FAT16) {	/* Too few clusters for FAT32? */
                    if (sz_au == 0 && (sz_au = pau / 2) != 0) continue;	/* Adjust cluster size and retry */
                    LEAVE_MKFS(FR_MKFS_ABORTED);
                }
            }
            if (fsty == FS_FAT16) {
                if (n_clst > MAX_FAT16) {	/* Too many clusters for FAT16 */
                    if (sz_au == 0 && (pau * 2) <= 64) {
                        sz_au = pau * 2; continue;		/* Adjust cluster size and retry */
                    }
                    if ((fsopt & FM_FAT32)) {
                        fsty = FS_FAT32; continue;	/* Switch type to FAT32 and retry */
                    }
                    if (sz_au == 0 && (sz_au = pau * 2) <= 128) continue;	/* Adjust cluster size and retry */
                    LEAVE_MKFS(FR_MKFS_ABORTED);
                }
                if  (n_clst <= MAX_FAT12) {	/* Too few clusters for FAT16 */
                    if (sz_au == 0 && (sz_au = pau * 2) <= 128) continue;	/* Adjust cluster size and retry */
                    LEAVE_MKFS(FR_MKFS_ABORTED);
                }
            }
            if (fsty == FS_FAT12 && n_clst > MAX_FAT12) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too many clusters for FAT12 */

            /* Ok, it is the valid cluster configuration */
            break;
        } while (1);

#if FF_USE_TRIM
        lba[0] = b_vol; lba[1] = b_vol + sz_vol - 1;	/* Inform storage device that the volume area may be erased */
        disk_ioctl(pdrv, CTRL_TRIM, lba);
#endif
        /* Create FAT VBR */
        mem_set(buf, 0, ss);
        mem_cpy(buf + BS_JmpBoot, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code (x86), OEM name */
        st_word(buf + BPB_BytsPerSec, ss);				/* Sector size [byte] */
        buf[BPB_SecPerClus] = (BYTE)pau;				/* Cluster size [sector] */
        st_word(buf + BPB_RsvdSecCnt, (WORD)sz_rsv);	/* Size of reserved area */
        buf[BPB_NumFATs] = (BYTE)n_fat;					/* Number of FATs */
        st_word(buf + BPB_RootEntCnt, (WORD)((fsty == FS_FAT32) ? 0 : n_root));	/* Number of root directory entries */
        if (sz_vol < 0x10000) {
            st_word(buf + BPB_TotSec16, (WORD)sz_vol);	/* Volume size in 16-bit LBA */
        } else {
            st_dword(buf + BPB_TotSec32, (DWORD)sz_vol);	/* Volume size in 32-bit LBA */
        }
        buf[BPB_Media] = 0xF8;							/* Media descriptor byte */
        st_word(buf + BPB_SecPerTrk, 63);				/* Number of sectors per track (for int13) */
        st_word(buf + BPB_NumHeads, 255);				/* Number of heads (for int13) */
        st_dword(buf + BPB_HiddSec, (DWORD)b_vol);		/* Volume offset in the physical drive [sector] */
        if (fsty == FS_FAT32) {
            st_dword(buf + BS_VolID32, GET_FATTIME());	/* VSN */
            st_dword(buf + BPB_FATSz32, sz_fat);		/* FAT size [sector] */
            st_dword(buf + BPB_RootClus32, 2);			/* Root directory cluster # (2) */
            st_word(buf + BPB_FSInfo32, 1);				/* Offset of FSINFO sector (VBR + 1) */
            st_word(buf + BPB_BkBootSec32, 6);			/* Offset of backup VBR (VBR + 6) */
            buf[BS_DrvNum32] = 0x80;					/* Drive number (for int13) */
            buf[BS_BootSig32] = 0x29;					/* Extended boot signature */
            mem_cpy(buf + BS_VolLab32, "NO NAME    " "FAT32   ", 19);	/* Volume label, FAT signature */
        } else {
            st_dword(buf + BS_VolID, GET_FATTIME());	/* VSN */
            st_word(buf + BPB_FATSz16, (WORD)sz_fat);	/* FAT size [sector] */
            buf[BS_DrvNum] = 0x80;						/* Drive number (for int13) */
            buf[BS_BootSig] = 0x29;						/* Extended boot signature */
            mem_cpy(buf + BS_VolLab, "NO NAME    " "FAT     ", 19);	/* Volume label, FAT signature */
        }
        st_word(buf + BS_55AA, 0xAA55);					/* Signature (offset is fixed here regardless of sector size) */
        if (disk_write(pdrv, buf, b_vol, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Write it to the VBR sector */

        /* Create FSINFO record if needed */
        if (fsty == FS_FAT32) {
            disk_write(pdrv, buf, b_vol + 6, 1);		/* Write backup VBR (VBR + 6) */
            mem_set(buf, 0, ss);
            st_dword(buf + FSI_LeadSig, 0x41615252);
            st_dword(buf + FSI_StrucSig, 0x61417272);
            st_dword(buf + FSI_Free_Count, n_clst - 1);	/* Number of free clusters */
            st_dword(buf + FSI_Nxt_Free, 2);			/* Last allocated cluster# */
            st_word(buf + BS_55AA, 0xAA55);
            disk_write(pdrv, buf, b_vol + 7, 1);		/* Write backup FSINFO (VBR + 7) */
            disk_write(pdrv, buf, b_vol + 1, 1);		/* Write original FSINFO (VBR + 1) */
        }

        /* Initialize FAT area */
        mem_set(buf, 0, sz_buf * ss);
        sect = b_fat;		/* FAT start sector */
        for (i = 0; i < n_fat; i++) {			/* Initialize FATs each */
            if (fsty == FS_FAT32) {
                st_dword(buf + 0, 0xFFFFFFF8);	/* FAT[0] */
                st_dword(buf + 4, 0xFFFFFFFF);	/* FAT[1] */
                st_dword(buf + 8, 0x0FFFFFFF);	/* FAT[2] (root directory) */
            } else {
                st_dword(buf + 0, (fsty == FS_FAT12) ? 0xFFFFF8 : 0xFFFFFFF8);	/* FAT[0] and FAT[1] */
            }
            nsect = sz_fat;		/* Number of FAT sectors */
            do {	/* Fill FAT sectors */
                n = (nsect > sz_buf) ? sz_buf : nsect;
                if (disk_write(pdrv, buf, sect, (UINT)n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
                mem_set(buf, 0, ss);	/* Rest of FAT all are cleared */
                sect += n; nsect -= n;
            } while (nsect);
        }

        /* Initialize root directory (fill with zero) */
        nsect = (fsty == FS_FAT32) ? pau : sz_dir;	/* Number of root directory sectors */
        do {
            n = (nsect > sz_buf) ? sz_buf : nsect;
            if (disk_write(pdrv, buf, sect, (UINT)n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
            sect += n; nsect -= n;
        } while (nsect);
    }

    /* A FAT volume has been created here */

    /* Determine system ID in the MBR partition table */
    if (FF_FS_EXFAT && fsty == FS_EXFAT) {
        sys = 0x07;			/* exFAT */
    } else {
        if (fsty == FS_FAT32) {
            sys = 0x0C;		/* FAT32X */
        } else {
            if (sz_vol >= 0x10000) {
                sys = 0x06;	/* FAT12/16 (large) */
            } else {
                sys = (fsty == FS_FAT16) ? 0x04 : 0x01;	/* FAT16 : FAT12 */
            }
        }
    }

    /* Update partition information */
    if (FF_MULTI_PARTITION && ipart != 0) {	/* Volume is in the existing partition */
        if (!FF_LBA64 || !(fsopt & 0x80)) {
            /* Update system ID in the partition table */
            if (disk_read(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Read the MBR */
            buf[MBR_Table + (ipart - 1) * SZ_PTE + PTE_System] = sys;			/* Set system ID */
            if (disk_write(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Write it back to the MBR */
        }
    } else {								/* Volume as a new single partition */
        if (!(fsopt & FM_SFD)) {	/* Create partition table if not in SFD */
            lba[0] = sz_vol, lba[1] = 0;
            fr = create_partition(pdrv, lba, sys, buf);
            if (fr != FR_OK) LEAVE_MKFS(fr);
        }
    }

    if (disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);

    LEAVE_MKFS(FR_OK);
}




#if FF_MULTI_PARTITION
/*-----------------------------------------------------------------------*/
/* Create Partition Table on the Physical Drive                          */
/*-----------------------------------------------------------------------*/

FRESULT f_fdisk (
    BYTE pdrv,			/* Physical drive number */
    const LBA_t ptbl[],	/* Pointer to the size table for each partitions */
    void* work			/* Pointer to the working buffer (null: use heap memory) */
)
{
    BYTE *buf = (BYTE*)work;
    DSTATUS stat;


    stat = disk_initialize(pdrv);
    if (stat & STA_NOINIT) return FR_NOT_READY;
    if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
#if FF_USE_LFN == 3
    if (!buf) buf = ff_memalloc(FF_MAX_SS);	/* Use heap memory for working buffer */
#endif
    if (!buf) return FR_NOT_ENOUGH_CORE;

    LEAVE_MKFS(create_partition(pdrv, ptbl, 0x07, buf));
}

#endif /* FF_MULTI_PARTITION */
#endif /* !FF_FS_READONLY && FF_USE_MKFS */




#if FF_USE_STRFUNC
#if FF_USE_LFN && FF_LFN_UNICODE && (FF_STRF_ENCODE < 0 || FF_STRF_ENCODE > 3)
#error Wrong FF_STRF_ENCODE setting
#endif
/*-----------------------------------------------------------------------*/
/* Get a String from the File                                            */
/*-----------------------------------------------------------------------*/

TCHAR* f_gets (
    TCHAR* buff,	/* Pointer to the buffer to store read string */
    int len,		/* Size of string buffer (items) */
    FIL* fp			/* Pointer to the file object */
)
{
    int nc = 0;
    TCHAR *p = buff;
    BYTE s[4];
    UINT rc;
    DWORD dc;
#if FF_USE_LFN && FF_LFN_UNICODE && FF_STRF_ENCODE <= 2
    WCHAR wc;
#endif
#if FF_USE_LFN && FF_LFN_UNICODE && FF_STRF_ENCODE == 3
    UINT ct;
#endif

#if FF_USE_LFN && FF_LFN_UNICODE			/* With code conversion (Unicode API) */
    /* Make a room for the character and terminator  */
    if (FF_LFN_UNICODE == 1) len -= (FF_STRF_ENCODE == 0) ? 1 : 2;
    if (FF_LFN_UNICODE == 2) len -= (FF_STRF_ENCODE == 0) ? 3 : 4;
    if (FF_LFN_UNICODE == 3) len -= 1;
    while (nc < len) {
#if FF_STRF_ENCODE == 0				/* Read a character in ANSI/OEM */
        f_read(fp, s, 1, &rc);		/* Get a code unit */
        if (rc != 1) break;			/* EOF? */
        wc = s[0];
        if (dbc_1st((BYTE)wc)) {	/* DBC 1st byte? */
            f_read(fp, s, 1, &rc);	/* Get DBC 2nd byte */
            if (rc != 1 || !dbc_2nd(s[0])) continue;	/* Wrong code? */
            wc = wc << 8 | s[0];
        }
        dc = ff_oem2uni(wc, CODEPAGE);	/* OEM --> */
        if (dc == 0) continue;
#elif FF_STRF_ENCODE == 1 || FF_STRF_ENCODE == 2 	/* Read a character in UTF-16LE/BE */
        f_read(fp, s, 2, &rc);		/* Get a code unit */
        if (rc != 2) break;			/* EOF? */
        dc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
        if (IsSurrogateL(dc)) continue;	/* Broken surrogate pair? */
        if (IsSurrogateH(dc)) {		/* High surrogate? */
            f_read(fp, s, 2, &rc);	/* Get low surrogate */
            if (rc != 2) break;		/* EOF? */
            wc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
            if (!IsSurrogateL(wc)) continue;	/* Broken surrogate pair? */
            dc = ((dc & 0x3FF) + 0x40) << 10 | (wc & 0x3FF);	/* Merge surrogate pair */
        }
#else	/* Read a character in UTF-8 */
        f_read(fp, s, 1, &rc);		/* Get a code unit */
        if (rc != 1) break;			/* EOF? */
        dc = s[0];
        if (dc >= 0x80) {			/* Multi-byte sequence? */
            ct = 0;
            if ((dc & 0xE0) == 0xC0) { dc &= 0x1F; ct = 1; }	/* 2-byte sequence? */
            if ((dc & 0xF0) == 0xE0) { dc &= 0x0F; ct = 2; }	/* 3-byte sequence? */
            if ((dc & 0xF8) == 0xF0) { dc &= 0x07; ct = 3; }	/* 4-byte sequence? */
            if (ct == 0) continue;
            f_read(fp, s, ct, &rc);		/* Get trailing bytes */
            if (rc != ct) break;
            rc = 0;
            do {	/* Merge the byte sequence */
                if ((s[rc] & 0xC0) != 0x80) break;
                dc = dc << 6 | (s[rc] & 0x3F);
            } while (++rc < ct);
            if (rc != ct || dc < 0x80 || IsSurrogate(dc) || dc >= 0x110000) continue;	/* Wrong encoding? */
        }
#endif
        /* A code point is avaialble in dc to be output */

        if (FF_USE_STRFUNC == 2 && dc == '\r') continue;	/* Strip \r off if needed */
#if FF_LFN_UNICODE == 1	|| FF_LFN_UNICODE == 3	/* Output it in UTF-16/32 encoding */
        if (FF_LFN_UNICODE == 1 && dc >= 0x10000) {	/* Out of BMP at UTF-16? */
            *p++ = (TCHAR)(0xD800 | ((dc >> 10) - 0x40)); nc++;	/* Make and output high surrogate */
            dc = 0xDC00 | (dc & 0x3FF);		/* Make low surrogate */
        }
        *p++ = (TCHAR)dc; nc++;
        if (dc == '\n') break;	/* End of line? */
#elif FF_LFN_UNICODE == 2		/* Output it in UTF-8 encoding */
        if (dc < 0x80) {	/* Single byte? */
            *p++ = (TCHAR)dc;
            nc++;
            if (dc == '\n') break;	/* End of line? */
        } else {
            if (dc < 0x800) {		/* 2-byte sequence? */
                *p++ = (TCHAR)(0xC0 | (dc >> 6 & 0x1F));
                *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                nc += 2;
            } else {
                if (dc < 0x10000) {	/* 3-byte sequence? */
                    *p++ = (TCHAR)(0xE0 | (dc >> 12 & 0x0F));
                    *p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
                    *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                    nc += 3;
                } else {			/* 4-byte sequence? */
                    *p++ = (TCHAR)(0xF0 | (dc >> 18 & 0x07));
                    *p++ = (TCHAR)(0x80 | (dc >> 12 & 0x3F));
                    *p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
                    *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                    nc += 4;
                }
            }
        }
#endif
    }

#else			/* Byte-by-byte read without any conversion (ANSI/OEM API) */
    len -= 1;	/* Make a room for the terminator */
    while (nc < len) {
        f_read(fp, s, 1, &rc);	/* Get a byte */
        if (rc != 1) break;		/* EOF? */
        dc = s[0];
        if (FF_USE_STRFUNC == 2 && dc == '\r') continue;
        *p++ = (TCHAR)dc; nc++;
        if (dc == '\n') break;
    }
#endif

    *p = 0;		/* Terminate the string */
    return nc ? buff : 0;	/* When no data read due to EOF or error, return with error. */
}




#if !FF_FS_READONLY
#include <stdarg.h>
/*-----------------------------------------------------------------------*/
/* Put a Character to the File (sub-functions)                           */
/*-----------------------------------------------------------------------*/

/* Putchar output buffer and work area */

typedef struct {
    FIL *fp;		/* Ptr to the writing file */
    int idx, nchr;	/* Write index of buf[] (-1:error), number of encoding units written */
#if FF_USE_LFN && FF_LFN_UNICODE == 1
    WCHAR hs;
#elif FF_USE_LFN && FF_LFN_UNICODE == 2
    BYTE bs[4];
    UINT wi, ct;
#endif
    BYTE buf[64];	/* Write buffer */
} putbuff;


/* Buffered write with code conversion */

static void putc_bfd (putbuff* pb, TCHAR c)
{
    UINT n;
    int i, nc;
#if FF_USE_LFN && FF_LFN_UNICODE
    WCHAR hs, wc;
#if FF_LFN_UNICODE == 2
    DWORD dc;
    const TCHAR *tp;
#endif
#endif

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

    i = pb->idx;			/* Write index of pb->buf[] */
    if (i < 0) return;
    nc = pb->nchr;			/* Write unit counter */

#if FF_USE_LFN && FF_LFN_UNICODE
#if FF_LFN_UNICODE == 1		/* UTF-16 input */
    if (IsSurrogateH(c)) {	/* High surrogate? */
        pb->hs = c; return;	/* Save it for next */
    }
    hs = pb->hs; pb->hs = 0;
    if (hs != 0) {			/* There is a leading high surrogate */
        if (!IsSurrogateL(c)) hs = 0;	/* Discard high surrogate if not a surrogate pair */
    } else {
        if (IsSurrogateL(c)) return;	/* Discard stray low surrogate */
    }
    wc = c;
#elif FF_LFN_UNICODE == 2	/* UTF-8 input */
    for (;;) {
        if (pb->ct == 0) {	/* Out of multi-byte sequence? */
            pb->bs[pb->wi = 0] = (BYTE)c;	/* Save 1st byte */
            if ((BYTE)c < 0x80) break;					/* Single byte? */
            if (((BYTE)c & 0xE0) == 0xC0) pb->ct = 1;	/* 2-byte sequence? */
            if (((BYTE)c & 0xF0) == 0xE0) pb->ct = 2;	/* 3-byte sequence? */
            if (((BYTE)c & 0xF1) == 0xF0) pb->ct = 3;	/* 4-byte sequence? */
            return;
        } else {				/* In the multi-byte sequence */
            if (((BYTE)c & 0xC0) != 0x80) {	/* Broken sequence? */
                pb->ct = 0; continue;
            }
            pb->bs[++pb->wi] = (BYTE)c;	/* Save the trailing byte */
            if (--pb->ct == 0) break;	/* End of multi-byte sequence? */
            return;
        }
    }
    tp = (const TCHAR*)pb->bs;
    dc = tchar2uni(&tp);	/* UTF-8 ==> UTF-16 */
    if (dc == 0xFFFFFFFF) return;	/* Wrong code? */
    wc = (WCHAR)dc;
    hs = (WCHAR)(dc >> 16);
#elif FF_LFN_UNICODE == 3	/* UTF-32 input */
    if (IsSurrogate(c) || c >= 0x110000) return;	/* Discard invalid code */
    if (c >= 0x10000) {		/* Out of BMP? */
        hs = (WCHAR)(0xD800 | ((c >> 10) - 0x40)); 	/* Make high surrogate */
        wc = 0xDC00 | (c & 0x3FF);					/* Make low surrogate */
    } else {
        hs = 0;
        wc = (WCHAR)c;
    }
#endif
    /* A code point in UTF-16 is available in hs and wc */

#if FF_STRF_ENCODE == 1		/* Write a code point in UTF-16LE */
    if (hs != 0) {	/* Surrogate pair? */
        st_word(&pb->buf[i], hs);
        i += 2;
        nc++;
    }
    st_word(&pb->buf[i], wc);
    i += 2;
#elif FF_STRF_ENCODE == 2	/* Write a code point in UTF-16BE */
    if (hs != 0) {	/* Surrogate pair? */
        pb->buf[i++] = (BYTE)(hs >> 8);
        pb->buf[i++] = (BYTE)hs;
        nc++;
    }
    pb->buf[i++] = (BYTE)(wc >> 8);
    pb->buf[i++] = (BYTE)wc;
#elif FF_STRF_ENCODE == 3	/* Write a code point in UTF-8 */
    if (hs != 0) {	/* 4-byte sequence? */
        nc += 3;
        hs = (hs & 0x3FF) + 0x40;
        pb->buf[i++] = (BYTE)(0xF0 | hs >> 8);
        pb->buf[i++] = (BYTE)(0x80 | (hs >> 2 & 0x3F));
        pb->buf[i++] = (BYTE)(0x80 | (hs & 3) << 4 | (wc >> 6 & 0x0F));
        pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
    } else {
        if (wc < 0x80) {	/* Single byte? */
            pb->buf[i++] = (BYTE)wc;
        } else {
            if (wc < 0x800) {	/* 2-byte sequence? */
                nc += 1;
                pb->buf[i++] = (BYTE)(0xC0 | wc >> 6);
            } else {			/* 3-byte sequence */
                nc += 2;
                pb->buf[i++] = (BYTE)(0xE0 | wc >> 12);
                pb->buf[i++] = (BYTE)(0x80 | (wc >> 6 & 0x3F));
            }
            pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
        }
    }
#else						/* Write a code point in ANSI/OEM */
    if (hs != 0) return;
    wc = ff_uni2oem(wc, CODEPAGE);	/* UTF-16 ==> ANSI/OEM */
    if (wc == 0) return;
    if (wc >= 0x100) {
        pb->buf[i++] = (BYTE)(wc >> 8); nc++;
    }
    pb->buf[i++] = (BYTE)wc;
#endif

#else									/* ANSI/OEM input (without re-encoding) */
    pb->buf[i++] = (BYTE)c;
#endif

    if (i >= (int)(sizeof pb->buf) - 4) {	/* Write buffered characters to the file */
        f_write(pb->fp, pb->buf, (UINT)i, &n);
        i = (n == (UINT)i) ? 0 : -1;
    }
    pb->idx = i;
    pb->nchr = nc + 1;
}


/* Flush remaining characters in the buffer */

static int putc_flush (putbuff* pb)
{
    UINT nw;

    if (   pb->idx >= 0	/* Flush buffered characters to the file */
        && f_write(pb->fp, pb->buf, (UINT)pb->idx, &nw) == FR_OK
        && (UINT)pb->idx == nw) return pb->nchr;
    return -1;
}


/* Initialize write buffer */

static void putc_init (putbuff* pb, FIL* fp)
{
    mem_set(pb, 0, sizeof (putbuff));
    pb->fp = fp;
}



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


    putc_init(&pb, fp);
    putc_bfd(&pb, c);	/* Put the character */
    return putc_flush(&pb);
}




/*-----------------------------------------------------------------------*/
/* Put a String to the File                                              */
/*-----------------------------------------------------------------------*/

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


    putc_init(&pb, fp);
    while (*str) putc_bfd(&pb, *str++);		/* Put the string */
    return putc_flush(&pb);
}




/*-----------------------------------------------------------------------*/
/* Put a Formatted String to the File                                    */
/*-----------------------------------------------------------------------*/

int f_printf (
    FIL* fp,			/* Pointer to the file object */
    const TCHAR* fmt,	/* Pointer to the format string */
    ...					/* Optional arguments... */
)
{
    va_list arp;
    putbuff pb;
    BYTE f, r;
    UINT i, j, w;
    DWORD v;
    TCHAR c, d, str[32], *p;


    putc_init(&pb, fp);

    va_start(arp, fmt);

    for (;;) {
        c = *fmt++;
        if (c == 0) break;			/* End of string */
        if (c != '%') {				/* Non escape character */
            putc_bfd(&pb, c);
            continue;
        }
        w = f = 0;
        c = *fmt++;
        if (c == '0') {				/* Flag: '0' padding */
            f = 1; c = *fmt++;
        } else {
            if (c == '-') {			/* Flag: left justified */
                f = 2; c = *fmt++;
            }
        }
        if (c == '*') {				/* Minimum width by argument */
            w = va_arg(arp, int);
            c = *fmt++;
        } else {
            while (IsDigit(c)) {	/* Minimum width */
                w = w * 10 + c - '0';
                c = *fmt++;
            }
        }
        if (c == 'l' || c == 'L') {	/* Type prefix: Size is long int */
            f |= 4; c = *fmt++;
        }
        if (c == 0) break;
        d = c;
        if (IsLower(d)) d -= 0x20;
        switch (d) {				/* Atgument type is... */
        case 'S':					/* String */
            p = va_arg(arp, TCHAR*);
            for (j = 0; p[j]; j++) ;
            if (!(f & 2)) {						/* Right padded */
                while (j++ < w) putc_bfd(&pb, ' ') ;
            }
            while (*p) putc_bfd(&pb, *p++) ;		/* String body */
            while (j++ < w) putc_bfd(&pb, ' ') ;	/* Left padded */
            continue;

        case 'C':					/* Character */
            putc_bfd(&pb, (TCHAR)va_arg(arp, int));
            continue;

        case 'B':					/* Unsigned binary */
            r = 2;
            break;

        case 'O':					/* Unsigned octal */
            r = 8; 
            break;

        case 'D':					/* Signed decimal */
        case 'U':					/* Unsigned decimal */
            r = 10;
            break;

        case 'X':					/* Unsigned hexdecimal */
            r = 16;
            break;

        default:					/* Unknown type (pass-through) */
            putc_bfd(&pb, c); continue;
        }

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

    va_end(arp);

    return putc_flush(&pb);
}

#endif /* !FF_FS_READONLY */
#endif /* FF_USE_STRFUNC */



#if FF_CODE_PAGE == 0
/*-----------------------------------------------------------------------*/
/* Set Active Codepage for the Path Name                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_setcp (
    WORD cp		/* Value to be set as active code page */
)
{
    static const WORD       validcp[] = {  437,   720,   737,   771,   775,   850,   852,   857,   860,   861,   862,   863,   864,   865,   866,   869,   932,   936,   949,   950, 0};
    static const BYTE* const tables[] = {Ct437, Ct720, Ct737, Ct771, Ct775, Ct850, Ct852, Ct857, Ct860, Ct861, Ct862, Ct863, Ct864, Ct865, Ct866, Ct869, Dc932, Dc936, Dc949, Dc950, 0};
    UINT i;


    for (i = 0; validcp[i] != 0 && validcp[i] != cp; i++) ;	/* Find the code page */
    if (validcp[i] != cp) return FR_INVALID_PARAMETER;	/* Not found? */

    CodePage = cp;
    if (cp >= 900) {	/* DBCS */
        ExCvt = 0;
        DbcTbl = tables[i];
    } else {			/* SBCS */
        ExCvt = tables[i];
        DbcTbl = 0;
    }
    return FR_OK;
}
#endif	/* FF_CODE_PAGE == 0 */

