// clang-format off

/*----------------------------------------------------------------------------/
/  FatFs - Generic FAT Filesystem Module  R0.15 w/patch1                      /
/-----------------------------------------------------------------------------/
/
/ Copyright (C) 2022, ChaN, all right reserved.
/
/ FatFs module is an open source software. Redistribution and use of FatFs in
/ source and binary forms, with or without modification, are permitted provided
/ that the following condition is met:
/
/ 1. Redistributions of source code must retain the above copyright notice,
/    this condition and the following disclaimer.
/
/ This software is provided by the copyright holder and contributors "AS IS"
/ and any warranties related to this software are DISCLAIMED.
/ The copyright owner or contributors be NOT LIABLE for any damages caused
/ by use of this software.
/
/----------------------------------------------------------------------------*/


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


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

   Module Private Definitions

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

#if FF_DEFINED != 80286	/* 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 IsSeparator(c)	((c) == '/' || (c) == '\\')
#define IsTerminator(c)	((UINT)(c) < (FF_USE_LFN ? ' ' : '!'))
#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 in FAT */
#define AM_MASKX	0x37	/* Mask of defined bits in exFAT */


/* 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 HDR: Signature (8-byte) */
#define GPTH_Rev			8		/* GPT HDR: Revision (DWORD) */
#define GPTH_Size			12		/* GPT HDR: Header size (DWORD) */
#define GPTH_Bcc			16		/* GPT HDR: Header BCC (DWORD) */
#define GPTH_CurLba			24		/* GPT HDR: This header LBA (QWORD) */
#define GPTH_BakLba			32		/* GPT HDR: Another header LBA (QWORD) */
#define GPTH_FstLba			40		/* GPT HDR: First LBA for partition data (QWORD) */
#define GPTH_LstLba			48		/* GPT HDR: Last LBA for partition data (QWORD) */
#define GPTH_DskGuid		56		/* GPT HDR: Disk GUID (16-byte) */
#define GPTH_PtOfs			72		/* GPT HDR: Partition table LBA (QWORD) */
#define GPTH_PtNum			80		/* GPT HDR: Number of table entries (DWORD) */
#define GPTH_PteSize		84		/* GPT HDR: Size of table entry (DWORD) */
#define GPTH_PtBcc			88		/* GPT HDR: Partition table BCC (DWORD) */
#define SZ_GPTE				128		/* GPT PTE: 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 of partition (QWORD) */
#define GPTE_LstLba			40		/* GPT PTE: Last LBA of partition (QWORD) */
#define GPTE_Flags			48		/* GPT PTE: Partition flags (QWORD) */
#define GPTE_Name			56		/* GPT PTE: Partition 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 */
#define LEAVE_FF(fs, res)	return res


/* Definitions of logical drive - physical location conversion */
#define LD2PD(vol) (BYTE)(vol)	/* Each logical drive is associated with the same physical drive number */
#define LD2PT(vol) 0			/* Auto partition search */


/* 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_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)


/* File lock controls */


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

static FATFS* FatFs[FF_VOLUMES];	/* Pointer to the filesystem objects (logical drives) */
static WORD Fsid;					/* Filesystem mount ID */







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

#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
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 */

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




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

#define CODEPAGE FF_CODE_PAGE
static const BYTE ExCvt[] = MKCVTBL(TBL_CT, FF_CODE_PAGE);





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

   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 = 0;

	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 = 0;

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


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;
}




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

/* Test if the byte is DBC 1st byte */
static int dbc_1st (BYTE c)
{
	if (c != 0) return 0;	/* Always false */
	return 0;
}


/* Test if the byte is DBC 2nd byte */
static int dbc_2nd (BYTE c)
{
	if (c != 0) return 0;	/* Always false */
	return 0;
}



/* 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 = 0;
	const TCHAR *p = *str;

	BYTE b = 0;
	int nf = 0;

	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 */
	}

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


/* Store a Unicode char in defined API encoding */
static UINT 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 */
)
{
	DWORD hc = 0;

	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;

}








/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the filesystem object                */
/*-----------------------------------------------------------------------*/
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;
}


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? */
		res = sync_window(fs);		/* Flush the window */
		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;
}




/*-----------------------------------------------------------------------*/
/* Synchronize filesystem and data on the storage                        */
/*-----------------------------------------------------------------------*/

static FRESULT sync_fs (	/* Returns FR_OK or FR_DISK_ERR */
	FATFS* fs		/* Filesystem object */
)
{
	FRESULT res = 0;


	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 */
			memset(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;
}




/*-----------------------------------------------------------------------*/
/* 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 an 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 = 0, bc = 0;
	DWORD val = 0;
	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;
		default:
			val = 1;	/* Internal error */
		}
	}

	return val;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Change value of an 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 = 0;
	BYTE *p = NULL;
	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:
			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;
}








/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = obj->fs;

	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;
		}
		clst = nxt;					/* Next cluster */
	} while (clst < fs->n_fatent);	/* Repeat while not the last link */

	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 = 0, ncl = 0, scl = 0;
	FRESULT res = 0;
	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 */

	{	/* 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 */
}









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

static FRESULT dir_clear (	/* Returns FR_OK or FR_DISK_ERR */
	FATFS *fs,		/* Filesystem object */
	DWORD clst		/* Directory table to clear */
)
{
	LBA_t sect = 0;
	UINT n = 0, szb = 0;
	BYTE *ibuf = NULL;


	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 */
	memset(fs->win, 0, sizeof fs->win);	/* Clear window buffer */
	{
		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;
}




/*-----------------------------------------------------------------------*/
/* 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 = 0, clst = 0;
	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 = 0, clst = 0;
	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 (!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 */
				}
				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;
}




/*-----------------------------------------------------------------------*/
/* 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 = 0;
	UINT n = 0;
	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 (dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0) {	/* Is the entry free? */
				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;
}





/*-----------------------------------------------------------------------*/
/* 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 = 0;

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

	return cl;
}


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));
	}
}



/*--------------------------------------------------------*/
/* 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 = 0, s = 0;
	WCHAR wc = 0, uc = 0;


	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 */
}


/*-----------------------------------------------------*/
/* 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 = 0, s = 0;
	WCHAR wc = 0, uc = 0;


	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 */
}


/*-----------------------------------------*/
/* 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 = 0, s = 0;
	WCHAR wc = 0;


	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 */
}




/*-----------------------------------------------------------------------*/
/* 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 in directory form */
	const WCHAR* lfn,	/* Pointer to LFN */
	UINT seq			/* Sequence number */
)
{
	BYTE ns[8] = {0}, c = 0;
	UINT i = 0, j = 0;
	WCHAR wc = 0;
	DWORD sreg = 0;


	memcpy(dst, src, 11);	/* Prepare the SFN to be modified */

	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;
	}

	/* Make suffix (~ + hexadecimal) */
	i = 7;
	do {
		c = (BYTE)((seq % 16) + '0'); seq /= 16;
		if (c > '9') c += 7;
		ns[i--] = c;
	} while (i && seq);
	ns[i] = '~';

	/* Append the suffix to the SFN body */
	for (j = 0; j < i && dst[j] != ' '; j++) {	/* Find the offset to append */
		if (dbc_1st(dst[j])) {	/* To avoid DBC break up */
			if (j == i - 1) break;
			j++;
		}
	}
	do {	/* Append the suffix */
		dst[j++] = (i < 8) ? ns[i++] : ' ';
	} while (j < 8);
}



/*-----------------------------------------------------------------------*/
/* 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;
}







/*-----------------------------------------------------------------------*/
/* 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 = 0, b = 0;
	BYTE ord = 0xFF, sum = 0xFF;

	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 */
		}
		{	/* On the FAT/FAT32 volume */
			dp->obj.attr = attr = dp->dir[DIR_Attr] & AM_MASK;	/* Get attribute */
			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;
				}
			}
		}
		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;
}




/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = dp->obj.fs;
	BYTE c = 0;
	BYTE a = 0, ord = 0, sum = 0;

	res = dir_sdi(dp, 0);			/* Rewind directory object */
	if (res != FR_OK) return res;
	/* On the FAT/FAT32 volume */
	ord = sum = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
	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 */
		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) && !memcmp(dp->dir, dp->fn, 11)) break;	/* SFN matched? */
				ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
			}
		}
		res = dir_next(dp, 0);	/* Next entry */
	} while (res == FR_OK);

	return res;
}




/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = dp->obj.fs;
	UINT n = 0, len = 0, n_ent = 0;
	BYTE sn[12] = {0}, sum = 0;


	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 */

	/* On the FAT/FAT32 volume */
	memcpy(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);
		}
	}


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

	return res;
}




/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = dp->obj.fs;
	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;
	}

	return res;
}




/*-----------------------------------------------------------------------*/
/* 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 = 0, di = 0;
	BYTE lcf = 0;
	WCHAR wc = 0, hs = 0;
	FATFS *fs = dp->obj.fs;
	UINT nw = 0;


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

	{	/* On the FAT/FAT32 volume */
		if (dp->blk_ofs != 0xFFFFFFFF) {	/* Get LFN if available */
			si = di = 0;
			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 */
				}
				nw = put_utf((DWORD)hs << 16 | wc, &fno->fname[di], FF_LFN_BUF - di);	/* Store it in API encoding */
				if (nw == 0) {				/* Buffer overflow or wrong char? */
					di = 0; break;
				}
				di += nw;
				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 (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) {				/* Wrong char in the current code page? */
			di = 0; break;
		}
		nw = put_utf(wc, &fno->altname[di], FF_SFN_BUF - di);	/* Store it in API encoding */
		if (nw == 0) {				/* Buffer overflow? */
			di = 0; break;
		}
		di += nw;
	}
	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 inaccessible */
			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. */
	}


	fno->fattrib = dp->dir[DIR_Attr] & AM_MASK;			/* 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 */
}







/*-----------------------------------------------------------------------*/
/* 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 */
)
{
	BYTE b = 0, cf = 0;
	WCHAR wc = 0;
	WCHAR *lfn = NULL;
	const TCHAR* p = NULL;
	DWORD uc = 0;
	UINT i = 0, ni = 0, si = 0, di = 0;


	/* 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 < ' ' || IsSeparator(wc)) break;	/* Break if end of the path or a separator is found */
		if (wc < 0x80 && strchr("*:<>|\"\?\x7F", (int)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 < ' ') {				/* Stopped at end of the path? */
		cf = NS_LAST;			/* Last segment */
	} else {					/* Stopped at a separator */
		while (IsSeparator(*p)) p++;	/* Skip duplicated separators if exist */
		cf = 0;					/* Next segment may follow */
		if (IsTerminator(*p)) cf = NS_LAST;	/* Ignore terminating separator */
	}
	*path = p;					/* Return pointer to the next segment */

	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) */

	memset(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 an extended character? */
			cf |= NS_LFN;	/* LFN entry needs to be created */
			wc = ff_uni2oem(wc, CODEPAGE);			/* Unicode ==> ANSI/OEM code */
			if (wc & 0x80) wc = ExCvt[wc & 0x7F];	/* Convert extended character to upper (SBCS) */
		}

		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 || strchr("+,;=[]", (int)wc)) {	/* Replace illegal characters for SFN */
				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;


}




/*-----------------------------------------------------------------------*/
/* 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 = 0;
	BYTE ns = 0;
	FATFS *fs = dp->obj.fs;


	{										/* With heading separator */
		while (IsSeparator(*path)) path++;	/* Strip separators */
		dp->obj.sclust = 0;					/* Start from the root directory */
	}

	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;
			}
			{
				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 = NULL;
	const TCHAR *tt = NULL;
	TCHAR tc = 0;
	int i = 0;
	int vol = -1;

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

	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 (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;
	}
	/* No drive prefix is found */
	vol = 0;		/* Default drive is 0 */
	return vol;		/* Return the default drive */
}




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




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

/* Check what the sector is */

static UINT check_fs (	/* 0:FAT/FAT32 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 = 0, sign = 0;
	BYTE b = 0;


	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);
	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 && !memcmp(fs->win + BS_FilSysType32, "FAT32   ", 8)) {
			return 0;	/* It is an FAT32 VBR */
		}
		/* FAT volumes formatted with early MS-DOS lack BS_55AA and BS_FilSysType, so FAT VBR needs to be identified without them. */
		w = ld_word(fs->win + BPB_BytsPerSec);
		b = fs->win[BPB_SecPerClus];
		if ((w & (w - 1)) == 0 && w >= FF_MIN_SS && w <= FF_MAX_SS	/* Properness of sector size (512-4096 and 2^n) */
			&& b != 0 && (b & (b - 1)) == 0				/* Properness of cluster size (2^n) */
			&& ld_word(fs->win + BPB_RsvdSecCnt) != 0	/* Properness of reserved sectors (MNBZ) */
			&& (UINT)fs->win[BPB_NumFATs] - 1 <= 1		/* Properness of FATs (1 or 2) */
			&& ld_word(fs->win + BPB_RootEntCnt) != 0	/* Properness of root dir entries (MNBZ) */
			&& (ld_word(fs->win + BPB_TotSec16) >= 128 || ld_dword(fs->win + BPB_TotSec32) >= 0x10000)	/* Properness of volume sectors (>=128) */
			&& ld_word(fs->win + BPB_FATSz16) != 0) {	/* Properness of FAT size (MNBZ) */
				return 0;	/* It 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:find as SFD and partitions, >0:forced partition number */
)
{
	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 format */
	if (fmt != 2 && (fmt >= 3 || part == 0)) return fmt;	/* Returns if it is an 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_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					/* Desired access mode to check write protection */
)
{
	int vol = 0;
	FATFS *fs = NULL;
	DSTATUS stat = 0;
	LBA_t bsect = 0;
	DWORD tsect = 0, sysect = 0, fasize = 0, nclst = 0, szbfat = 0;
	WORD nrsv = 0;
	UINT fmt = 0;


	/* 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? */
	*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 an FAT volume, analyze the BPB and initialize the filesystem object) */

	fs->fs_type = 0;					/* Invalidate the filesystem object */
	stat = disk_initialize(fs->pdrv);	/* Initialize the volume hosting 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 hosting drive */
	fmt = find_volume(fs, LD2PT(vol));
	if (fmt == 4) return FR_DISK_ERR;		/* An error occurred in the disk I/O layer */
	if (fmt >= 2) return FR_NO_FILESYSTEM;	/* No FAT volume is found */
	bsect = fs->winsect;					/* Volume offset in the hosting physical drive */

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

	{
		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) */

		/* 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 */
	}

	fs->fs_type = (BYTE)fmt;/* FAT sub-type (the filesystem object gets valid) */
	fs->id = ++Fsid;		/* Volume mount ID */
	fs->lfnbuf = LfnBuf;	/* Static LFN working buffer */
	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 structure, 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 (!(disk_status(obj->fs->pdrv) & STA_NOINIT)) { /* Test if the hosting phsical drive is kept initialized */
			res = FR_OK;
		}
	}
	*rfs = (res == FR_OK) ? obj->fs : 0;	/* Return corresponding filesystem object if it is valid */
	return res;
}




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

   Public Functions (FatFs API)

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



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

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


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

	if (cfs) {					/* Unregister current filesystem object if regsitered */
		FatFs[vol] = 0;
		cfs->fs_type = 0;		/* Invalidate the filesystem object to be unregistered */
	}

	if (fs) {					/* Register new filesystem object */
		fs->pdrv = LD2PD(vol);	/* Volume hosting physical drive */
		fs->fs_type = 0;		/* Invalidate the new filesystem object */
		FatFs[vol] = fs;		/* Register new fs object */
	}

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

	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 open mode flags */
)
{
	FRESULT res = 0;
	DIR dj = {0};
	FATFS *fs = NULL;
	DWORD cl = 0, bcs = 0, clst = 0, tm = 0;
	LBA_t sc = 0;
	FSIZE_t ofs = 0;
	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 (res == FR_OK) {
			if (dj.fn[NSFLAG] & NS_NONAME) {	/* Origin directory itself? */
				res = FR_INVALID_NAME;
			}
		}
		/* 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 */
					res = dir_register(&dj);
				}
				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 */
				{
					/* 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 (res == FR_OK) {
			{
				fp->obj.sclust = ld_clust(fs, dj.dir);					/* Get object allocation info */
				fp->obj.objsize = ld_dword(dj.dir + DIR_FileSize);
			}
			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 */
			memset(fp->buf, 0, sizeof fp->buf);	/* Clear sector buffer */
			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 (disk_read(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) res = FR_DISK_ERR;
					}
				}
			}
		}

		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, 	/* Open file to be read */
	void* buff,	/* Data buffer to store the read data */
	UINT btr,	/* Number of bytes to read */
	UINT* br	/* Number of bytes read */
)
{
	FRESULT res = 0;
	FATFS *fs = NULL;
	DWORD clst = 0;
	LBA_t sect = 0;
	FSIZE_t remain = 0;
	UINT rcnt = 0, cc = 0, csect = 0;
	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 > 0; btr -= rcnt, *br += rcnt, rbuff += rcnt, fp->fptr += rcnt) {	/* Repeat until btr bytes read */
		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 */
					{
						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 ((fp->flag & FA_DIRTY) && fp->sect - sect < cc) {
					memcpy(rbuff + ((fp->sect - sect) * SS(fs)), fp->buf, SS(fs));
				}
				rcnt = SS(fs) * cc;				/* Number of bytes transferred */
				continue;
			}
			if (fp->sect != sect) {			/* Load data sector if not in cache */
				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;
				}
				if (disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK)	ABORT(fs, FR_DISK_ERR);	/* Fill sector cache */
			}
			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 */
		memcpy(rbuff, fp->buf + fp->fptr % SS(fs), rcnt);	/* Extract partial sector */
	}

	LEAVE_FF(fs, FR_OK);
}




/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_write (
	FIL* fp,			/* Open file to be written */
	const void* buff,	/* Data to be written */
	UINT btw,			/* Number of bytes to write */
	UINT* bw			/* Number of bytes written */
)
{
	FRESULT res = 0;
	FATFS *fs = NULL;
	DWORD clst = 0;
	LBA_t sect = 0;
	UINT wcnt = 0, cc = 0, csect = 0;
	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 > 0; btw -= wcnt, *bw += wcnt, wbuff += wcnt, fp->fptr += wcnt, fp->obj.objsize = (fp->fptr > fp->obj.objsize) ? fp->fptr : fp->obj.objsize) {	/* Repeat until all data written */
		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 */
					{
						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 (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;
			}
			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 (fp->sect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
					memcpy(fp->buf, wbuff + ((fp->sect - sect) * SS(fs)), SS(fs));
					fp->flag &= (BYTE)~FA_DIRTY;
				}
				wcnt = SS(fs) * cc;		/* Number of bytes transferred */
				continue;
			}
			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);
			}
			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 */
		memcpy(fp->buf + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
		fp->flag |= FA_DIRTY;
	}

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

	LEAVE_FF(fs, FR_OK);
}




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

FRESULT f_sync (
	FIL* fp		/* Open file to be synced */
)
{
	FRESULT res = 0;
	FATFS *fs = NULL;
	DWORD tm = 0;
	BYTE *dir = NULL;


	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 (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;
			}
			/* Update the directory entry */
			tm = GET_FATTIME();				/* Modified time */
			{
				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);
}





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

FRESULT f_close (
	FIL* fp		/* Open file to be closed */
)
{
	FRESULT res = 0;
	FATFS *fs = NULL;

	res = f_sync(fp);					/* Flush cached data */
	if (res == FR_OK)
	{
		res = validate(&fp->obj, &fs);	/* Lock volume */
		if (res == FR_OK) {
			fp->obj.fs = 0;	/* Invalidate file object */
		}
	}
	return res;
}







/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = NULL;
	DWORD clst = 0, bcs = 0;
	LBA_t nsect = 0;
	FSIZE_t ifptr = 0;

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


	/* Normal Seek */
	{
		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 (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;
				}
				fp->clust = clst;
			}
			if (clst != 0) {
				while (ofs > bcs) {						/* Cluster following loop */
					ofs -= bcs; fp->fptr += bcs;
					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
					{
						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 (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;
			}
			if (disk_read(fs->pdrv, fp->buf, nsect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);	/* Fill sector cache */
			fp->sect = nsect;
		}
	}

	LEAVE_FF(fs, res);
}



/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = NULL;
	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 */
					{
						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 */
			}
		}
		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 failed */

	LEAVE_FF(fs, res);
}




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

FRESULT f_closedir (
	DIR *dp		/* Pointer to the directory object to be closed */
)
{
	FRESULT res = 0;
	FATFS *fs = NULL;


	res = validate(&dp->obj, &fs);	/* Check validity of the file object */
	if (res == FR_OK) {
		dp->obj.fs = 0;	/* Invalidate directory object */
	}
	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 = 0;
	FATFS *fs = NULL;
	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);
}






/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat (
	const TCHAR* path,	/* Pointer to the file path */
	FILINFO* fno		/* Pointer to file information to return */
)
{
	FRESULT res = 0;
	DIR dj = {0};
	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);
}



/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = NULL;
	DWORD nfree = 0, clst = 0, stat = 0;
	LBA_t sect = 0;
	UINT i = 0;
	FFOBJID obj = {0};


	/* 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 {
				{	/* 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) {	/* New sector? */
							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);
				}
			}
			if (res == FR_OK) {		/* Update parameters if succeeded */
				*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 = 0;
	FATFS *fs = NULL;
	DWORD ncl = 0;


	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 (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;
			}
		}
		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 = 0;
	FATFS *fs = NULL;
	DIR dj = {0}, sdj = {0};
	DWORD dclst = 0;
	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 (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) {
				{
					dclst = ld_clust(fs, dj.dir);
				}
				if (dj.obj.attr & AM_DIR) {			/* Is it a sub-directory? */
					{
						sdj.obj.fs = fs;			/* Open the sub-directory */
						sdj.obj.sclust = dclst;
						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 */
					res = remove_chain(&dj.obj, dclst, 0);
				}
				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 = 0;
	FATFS *fs = NULL;
	DIR dj = {0};
	FFOBJID sobj = {0};
  DWORD dcl = 0, pcl = 0, tm = 0;
	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) */
						memset(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);
						memcpy(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 directory */
				}
			}
			if (res == FR_OK) {
				{
					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 = 0;
	FATFS *fs = NULL;
	DIR djo = {0}, djn = {0};
	BYTE buf[(FF_FS_EXFAT) ? (SZDIRE * 2) : (SZDIRE)] = {0}, *dir = NULL;
	LBA_t sect = 0;
	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 (res == FR_OK) {					/* Object to be renamed is found */
			{	/* At FAT/FAT32 volume */
				memcpy(buf, djo.dir, SZDIRE);			/* Save directory entry of the object */
				memcpy(&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 */
						memcpy(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);
}







/*-----------------------------------------------------------------------*/
/* 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 = 0;
	FATFS *fs = NULL;
	DIR dj = {0};
	UINT si = 0, di = 0;
	WCHAR wc = 0;

	/* 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) {
				{
					si = di = 0;		/* Extract volume label from AM_VOL entry */
					while (si < 11) {
						wc = dj.dir[si++];
						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) {		/* Invalid char in current code page? */
							di = 0; break;
						}
						di += put_utf(wc, &label[di], 4);	/* Store it in Unicode */
					}
					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);
}



/*-----------------------------------------------------------------------*/
/* Set Volume Label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_setlabel (
	const TCHAR* label	/* Volume label to set with heading logical drive number */
)
{
	FRESULT res = 0;
	FATFS *fs = NULL;
	DIR dj = {0};
	BYTE dirvn[22] = {0};
	UINT di = 0;
	WCHAR wc = 0;
	static const char badchr[18] = "+.,;=[]" "/*:<>|\\\"\?\x7F";	/* [0..16] for FAT, [7..16] for exFAT */
	DWORD dc = 0;

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

	{	/* On the FAT/FAT32 volume */
		memset(dirvn, ' ', 11);
		di = 0;
		while ((UINT)*label >= ' ') {	/* Create volume label */
			dc = tchar2uni(&label);
			wc = (dc < 0x10000) ? ff_uni2oem(ff_wtoupper(dc), CODEPAGE) : 0;
			if (wc == 0 || strchr(&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 */
				memcpy(dj.dir + XDIR_Label, dirvn, 22);
			} else {
				if (di != 0) {
					memcpy(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) {
						memset(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;
							memcpy(dj.dir + XDIR_Label, dirvn, 22);
						} else {
							dj.dir[DIR_Attr] = AM_VOL;		/* Create volume label entry */
							memcpy(dj.dir, dirvn, 11);
						}
						fs->wflag = 1;
						res = sync_fs(fs);
					}
				}
			}
		}
	}

	LEAVE_FF(fs, res);
}










#if !FF_FS_READONLY && FF_USE_MKFS
/*-----------------------------------------------------------------------*/
/* Create FAT/exFAT volume (with sub-functions)                          */
/*-----------------------------------------------------------------------*/

#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 each partition (for only MBR) */
	BYTE *buf			/* Working buffer for a sector */
)
{
	UINT i = 0, cy = 0;
	LBA_t sz_drv = 0;
	DWORD sz_drv32 = 0, nxt_alloc32 = 0, sz_part32 = 0;
	BYTE *pte = NULL;
	BYTE hd = 0, n_hd = 0, sc = 0, n_sc = 0;

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

	{	/* Create partitions in MBR format */
		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 */

		memset(buf, 0, FF_MAX_SS);		/* Clear MBR */
		pte = buf + MBR_Table;	/* Partition table in the MBR */
		for (i = 0, nxt_alloc32 = n_sc; i < 4 && nxt_alloc32 != 0 && nxt_alloc32 < sz_drv32; i++, nxt_alloc32 += sz_part32) {
			sz_part32 = (DWORD)plst[i];	/* Get partition size */
			if (sz_part32 <= 100) sz_part32 = (sz_part32 == 100) ? sz_drv32 : sz_drv32 / 100 * sz_part32;	/* Size in percentage? */
			if (nxt_alloc32 + sz_part32 > sz_drv32 || nxt_alloc32 + sz_part32 < nxt_alloc32) sz_part32 = sz_drv32 - nxt_alloc32;	/* Clip at drive size */
			if (sz_part32 == 0) break;	/* End of table or no sector to allocate? */

			st_dword(pte + PTE_StLba, nxt_alloc32);	/* Start LBA */
			st_dword(pte + PTE_SizLba, sz_part32);	/* Number of sectors */
			pte[PTE_System] = sys;					/* System type */

			cy = (UINT)(nxt_alloc32 / n_sc / n_hd);	/* Start cylinder */
			hd = (BYTE)(nxt_alloc32 / n_sc % n_hd);	/* Start head */
			sc = (BYTE)(nxt_alloc32 % n_sc + 1);	/* Start sector */
			pte[PTE_StHead] = hd;
			pte[PTE_StSec] = (BYTE)((cy >> 2 & 0xC0) | sc);
			pte[PTE_StCyl] = (BYTE)cy;

			cy = (UINT)((nxt_alloc32 + sz_part32 - 1) / n_sc / n_hd);	/* End cylinder */
			hd = (BYTE)((nxt_alloc32 + sz_part32 - 1) / n_sc % n_hd);	/* End head */
			sc = (BYTE)((nxt_alloc32 + sz_part32 - 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 len bytes of 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 = 0, fsty = 0, sys = 0, pdrv = 0, ipart = 0;
	BYTE *buf = NULL;
	BYTE *pte = NULL;
	WORD ss = 0;	/* Sector size */
	DWORD sz_buf = 0, sz_blk = 0, n_clst = 0, pau = 0, nsect = 0, n = 0, vsn = 0;
	LBA_t sz_vol, b_vol, b_fat, b_data;		/* Size of volume, Base LBA of volume, fat, data */
	LBA_t sect = 0, lba[2] = {0};
	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 = 0;
	DSTATUS ds = 0;
	FRESULT res = 0;


	/* 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);		/* Hosting physical drive */
	ipart = LD2PT(vol);		/* Hosting partition (0:create as new, 1..:existing partition) */

	/* Initialize the hosting physical drive */
	ds = disk_initialize(pdrv);
	if (ds & STA_NOINIT) return FR_NOT_READY;
	if (ds & STA_PROTECT) return FR_WRITE_PROTECTED;

	/* Get physical drive parameters (sz_drv, sz_blk and ss) */
	if (!opt) opt = &defopt;	/* Use default parameter if it is not given */
	sz_blk = opt->align;
	if (sz_blk == 0) disk_ioctl(pdrv, GET_BLOCK_SIZE, &sz_blk);					/* Block size from the paramter or lower layer */
	if (sz_blk == 0 || sz_blk > 0x8000 || (sz_blk & (sz_blk - 1))) sz_blk = 1;	/* Use default if the block size is invalid */
#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 (!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 */
		{	/* 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 */
			{	/* 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 an 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 (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);

	vsn = (DWORD)sz_vol + GET_FATTIME();	/* VSN generated from current time and partitiion size */
	{	/* 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);

		/* Create FAT VBR */
		memset(buf, 0, ss);
		memcpy(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, vsn);			/* 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 */
			memcpy(buf + BS_VolLab32, "NO NAME    " "FAT32   ", 19);	/* Volume label, FAT signature */
		} else {
			st_dword(buf + BS_VolID, vsn);				/* 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 */
			memcpy(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) */
			memset(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 */
		memset(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);
				memset(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 if (fsty == FS_FAT16) {
		sys = 0x04;		/* FAT16 */
	} else {
		sys = 0x01;		/* FAT12 */
	}

	/* Update partition information */
	if (FF_MULTI_PARTITION && ipart != 0) {	/* Volume is in the existing partition */
		if (!FF_LBA64 || !(fsopt & 0x80)) {	/* Is the partition in MBR? */
			/* 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 format */
			lba[0] = sz_vol; lba[1] = 0;
			res = create_partition(pdrv, lba, sys, buf);
			if (res != FR_OK) LEAVE_MKFS(res);
		}
	}

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

	LEAVE_MKFS(FR_OK);
}




#endif /* !FF_FS_READONLY && FF_USE_MKFS */








