text: /*----------------------------------------------------------------------------/
  /  FatFs - Generic FAT Filesystem Module  R0.14b                              /
  /-----------------------------------------------------------------------------/
  /
  / Copyright (C) 2021, 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 */
  
  #include <generated/csr.h>
  
  /*--------------------------------------------------------------------------
  
     Module Private Definitions
  
  ---------------------------------------------------------------------------*/
  
  #if FF_DEFINED != 86631	/* 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: Header signature (8-byte) */
  #define GPTH_Rev			8		/* GPT: Revision (DWORD) */
  #define GPTH_Size			12		/* GPT: Header size (DWORD) */
  #define GPTH_Bcc			16		/* GPT: Header BCC (DWORD) */
  #define GPTH_CurLba			24		/* GPT: Main header LBA (QWORD) */
  #define GPTH_BakLba			32		/* GPT: Backup header LBA (QWORD) */
  #define GPTH_FstLba			40		/* GPT: First LBA for partitions (QWORD) */
  #define GPTH_LstLba			48		/* GPT: Last LBA for partitions (QWORD) */
  #define GPTH_DskGuid		56		/* GPT: Disk GUID (16-byte) */
  #define GPTH_PtOfs			72		/* GPT: Partation table LBA (QWORD) */
  #define GPTH_PtNum			80		/* GPT: Number of table entries (DWORD) */
  #define GPTH_PteSize		84		/* GPT: Size of table entry (DWORD) */
  #define GPTH_PtBcc			88		/* GPT: Partation table BCC (DWORD) */
  #define SZ_GPTE				128		/* GPT: Size of partition table entry */
  #define GPTE_PtGuid			0		/* GPT PTE: Partition type GUID (16-byte) */
  #define GPTE_UpGuid			16		/* GPT PTE: Partition unique GUID (16-byte) */
  #define GPTE_FstLba			32		/* GPT PTE: First LBA (QWORD) */
  #define GPTE_LstLba			40		/* GPT PTE: Last LBA inclusive (QWORD) */
  #define GPTE_Flags			48		/* GPT PTE: Flags (QWORD) */
  #define GPTE_Name			56		/* GPT PTE: Name */
  
  
  /* Post process on fatal error in the file operations */
  #define ABORT(fs, res)		{ fp->err = (BYTE)(res); LEAVE_FF(fs, res); }
  
  
  /* Re-entrancy related */
  #if FF_FS_REENTRANT
  #if FF_USE_LFN == 1
  #error Static LFN work area cannot be used in thread-safe configuration
  #endif
  #define LEAVE_FF(fs, res)	{ unlock_fs(fs, res); return res; }
  #else
  #define LEAVE_FF(fs, res)	return res
  #endif
  
  
  /* Definitions of logical drive - physical location conversion */
  #if FF_MULTI_PARTITION
  #define LD2PD(vol) VolToPart[vol].pd	/* Get physical drive number */
  #define LD2PT(vol) VolToPart[vol].pt	/* Get partition number (0:auto search, 1..:forced partition number) */
  #else
  #define LD2PD(vol) (BYTE)(vol)	/* Each logical drive is associated with the same physical drive number */
  #define LD2PT(vol) 0			/* Auto partition search */
  #endif
  
  
  /* Definitions of sector size */
  #if (FF_MAX_SS < FF_MIN_SS) || (FF_MAX_SS != 512 && FF_MAX_SS != 1024 && FF_MAX_SS != 2048 && FF_MAX_SS != 4096) || (FF_MIN_SS != 512 && FF_MIN_SS != 1024 && FF_MIN_SS != 2048 && FF_MIN_SS != 4096)
  #error Wrong sector size configuration
  #endif
  #if FF_MAX_SS == FF_MIN_SS
  #define SS(fs)	((UINT)FF_MAX_SS)	/* Fixed sector size */
  #else
  #define SS(fs)	((fs)->ssize)	/* Variable sector size */
  #endif
  
  
  /* Timestamp */
  #if FF_FS_NORTC == 1
  #if FF_NORTC_YEAR < 1980 || FF_NORTC_YEAR > 2107 || FF_NORTC_MON < 1 || FF_NORTC_MON > 12 || FF_NORTC_MDAY < 1 || FF_NORTC_MDAY > 31
  #error Invalid FF_FS_NORTC settings
  #endif
  #define GET_FATTIME()	((DWORD)(FF_NORTC_YEAR - 1980) << 25 | (DWORD)FF_NORTC_MON << 21 | (DWORD)FF_NORTC_MDAY << 16)
  #else
  #define GET_FATTIME()	get_fattime()
  #endif
  
  
  /* File lock controls */
  #if FF_FS_LOCK != 0
  #if FF_FS_READONLY
  #error FF_FS_LOCK must be 0 at read-only configuration
  #endif
  typedef struct {
  	FATFS *fs;		/* Object ID 1, volume (NULL:blank entry) */
  	DWORD clu;		/* Object ID 2, containing directory (0:root) */
  	DWORD ofs;		/* Object ID 3, offset in the directory */
  	WORD ctr;		/* Object open counter, 0:none, 0x01..0xFF:read mode open count, 0x100:write mode */
  } FILESEM;
  #endif
  
  
  /* SBCS up-case tables (\x80-\xFF) */
  #define TBL_CT437  {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
  					0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT720  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT737  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
  					0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xEF,0xF5,0xF0,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT771  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDC,0xDE,0xDE, \
  					0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFE,0xFF}
  #define TBL_CT775  {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F, \
  					0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
  					0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT850  {0x43,0x55,0x45,0x41,0x41,0x41,0x41,0x43,0x45,0x45,0x45,0x49,0x49,0x49,0x41,0x41, \
  					0x45,0x92,0x92,0x4F,0x4F,0x4F,0x55,0x55,0x59,0x4F,0x55,0x4F,0x9C,0x4F,0x9E,0x9F, \
  					0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0x41,0x41,0x41,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0x41,0x41,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD1,0xD1,0x45,0x45,0x45,0x49,0x49,0x49,0x49,0xD9,0xDA,0xDB,0xDC,0xDD,0x49,0xDF, \
  					0x4F,0xE1,0x4F,0x4F,0x4F,0x4F,0xE6,0xE8,0xE8,0x55,0x55,0x55,0x59,0x59,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT852  {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F, \
  					0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0xAC, \
  					0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}
  #define TBL_CT855  {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F, \
  					0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
  					0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
  					0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF, \
  					0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT857  {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x49,0x8E,0x8F, \
  					0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
  					0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0x49,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT860  {0x80,0x9A,0x90,0x8F,0x8E,0x91,0x86,0x80,0x89,0x89,0x92,0x8B,0x8C,0x98,0x8E,0x8F, \
  					0x90,0x91,0x92,0x8C,0x99,0xA9,0x96,0x9D,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0x86,0x8B,0x9F,0x96,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT861  {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x8B,0x8B,0x8D,0x8E,0x8F, \
  					0x90,0x92,0x92,0x4F,0x99,0x8D,0x55,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
  					0xA4,0xA5,0xA6,0xA7,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT862  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT863  {0x43,0x55,0x45,0x41,0x41,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x41,0x8F, \
  					0x45,0x45,0x45,0x4F,0x45,0x49,0x55,0x55,0x98,0x4F,0x55,0x9B,0x9C,0x55,0x55,0x9F, \
  					0xA0,0xA1,0x4F,0x55,0xA4,0xA5,0xA6,0xA7,0x49,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT864  {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
  					0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT865  {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
  					0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
  					0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT866  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
  					0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
  					0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
  #define TBL_CT869  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
  					0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x86,0x9C,0x8D,0x8F,0x90, \
  					0x91,0x90,0x92,0x95,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
  					0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
  					0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
  					0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xA4,0xA5,0xA6,0xD9,0xDA,0xDB,0xDC,0xA7,0xA8,0xDF, \
  					0xA9,0xAA,0xAC,0xAD,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xCF,0xCF,0xD0,0xEF, \
  					0xF0,0xF1,0xD1,0xD2,0xD3,0xF5,0xD4,0xF7,0xF8,0xF9,0xD5,0x96,0x95,0x98,0xFE,0xFF}
  
  
  /* DBCS code range |----- 1st byte -----|  |----------- 2nd byte -----------| */
  /*                  <------>    <------>    <------>    <------>    <------>  */
  #define TBL_DC932 {0x81, 0x9F, 0xE0, 0xFC, 0x40, 0x7E, 0x80, 0xFC, 0x00, 0x00}
  #define TBL_DC936 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0x80, 0xFE, 0x00, 0x00}
  #define TBL_DC949 {0x81, 0xFE, 0x00, 0x00, 0x41, 0x5A, 0x61, 0x7A, 0x81, 0xFE}
  #define TBL_DC950 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0xA1, 0xFE, 0x00, 0x00}
  
  
  /* Macros for table definitions */
  #define MERGE_2STR(a, b) a ## b
  #define MKCVTBL(hd, cp) MERGE_2STR(hd, cp)
  
  
  
  
  /*--------------------------------------------------------------------------
  
     Module Private Work Area
  
  ---------------------------------------------------------------------------*/
  /* Remark: Variables defined here without initial value shall be guaranteed
  /  zero/null at start-up. If not, the linker option or start-up routine is
  /  not compliance with C standard. */
  
  /*--------------------------------*/
  /* File/Volume controls           */
  /*--------------------------------*/
  
  #if FF_VOLUMES < 1 || FF_VOLUMES > 10
  #error Wrong FF_VOLUMES setting
  #endif
  static FATFS* FatFs[FF_VOLUMES];	/* Pointer to the filesystem objects (logical drives) */
  static WORD Fsid;					/* Filesystem mount ID */
  
  #if FF_FS_RPATH != 0
  static BYTE CurrVol;				/* Current drive */
  #endif
  
  #if FF_FS_LOCK != 0
  static FILESEM Files[FF_FS_LOCK];	/* Open object lock semaphores */
  #endif
  
  #if FF_STR_VOLUME_ID
  #ifdef FF_VOLUME_STRS
  static const char* const VolumeStr[FF_VOLUMES] = {FF_VOLUME_STRS};	/* Pre-defined volume ID */
  #endif
  #endif
  
  #if FF_LBA64
  #if FF_MIN_GPT > 0x100000000
  #error Wrong FF_MIN_GPT setting
  #endif
  static const BYTE GUID_MS_Basic[16] = {0xA2,0xA0,0xD0,0xEB,0xE5,0xB9,0x33,0x44,0x87,0xC0,0x68,0xB6,0xB7,0x26,0x99,0xC7};
  #endif
  
  
  
  /*--------------------------------*/
  /* LFN/Directory working buffer   */
  /*--------------------------------*/
  
  #if FF_USE_LFN == 0		/* Non-LFN configuration */
  #if FF_FS_EXFAT
  #error LFN must be enabled when enable exFAT
  #endif
  #define DEF_NAMBUF
  #define INIT_NAMBUF(fs)
  #define FREE_NAMBUF()
  #define LEAVE_MKFS(res)	return res
  
  #else					/* LFN configurations */
  #if FF_MAX_LFN < 12 || FF_MAX_LFN > 255
  #error Wrong setting of FF_MAX_LFN
  #endif
  #if FF_LFN_BUF < FF_SFN_BUF || FF_SFN_BUF < 12
  #error Wrong setting of FF_LFN_BUF or FF_SFN_BUF
  #endif
  #if FF_LFN_UNICODE < 0 || FF_LFN_UNICODE > 3
  #error Wrong setting of FF_LFN_UNICODE
  #endif
  static const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};	/* FAT: Offset of LFN characters in the directory entry */
  #define MAXDIRB(nc)	((nc + 44U) / 15 * SZDIRE)	/* exFAT: Size of directory entry block scratchpad buffer needed for the name length */
  
  #if FF_USE_LFN == 1		/* LFN enabled with static working buffer */
  #if FF_FS_EXFAT
  static BYTE	DirBuf[MAXDIRB(FF_MAX_LFN)];	/* Directory entry block scratchpad buffer */
  #endif
  static WCHAR LfnBuf[FF_MAX_LFN + 1];		/* LFN working buffer */
  #define DEF_NAMBUF
  #define INIT_NAMBUF(fs)
  #define FREE_NAMBUF()
  #define LEAVE_MKFS(res)	return res
  
  #elif FF_USE_LFN == 2 	/* LFN enabled with dynamic working buffer on the stack */
  #if FF_FS_EXFAT
  #define DEF_NAMBUF		WCHAR lbuf[FF_MAX_LFN+1]; BYTE dbuf[MAXDIRB(FF_MAX_LFN)];	/* LFN working buffer and directory entry block scratchpad buffer */
  #define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; (fs)->dirbuf = dbuf; }
  #define FREE_NAMBUF()
  #else
  #define DEF_NAMBUF		WCHAR lbuf[FF_MAX_LFN+1];	/* LFN working buffer */
  #define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; }
  #define FREE_NAMBUF()
  #endif
  #define LEAVE_MKFS(res)	return res
  
  #elif FF_USE_LFN == 3 	/* LFN enabled with dynamic working buffer on the heap */
  #if FF_FS_EXFAT
  #define DEF_NAMBUF		WCHAR *lfn;	/* Pointer to LFN working buffer and directory entry block scratchpad buffer */
  #define INIT_NAMBUF(fs)	{ lfn = ff_memalloc((FF_MAX_LFN+1)*2 + MAXDIRB(FF_MAX_LFN)); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; (fs)->dirbuf = (BYTE*)(lfn+FF_MAX_LFN+1); }
  #define FREE_NAMBUF()	ff_memfree(lfn)
  #else
  #define DEF_NAMBUF		WCHAR *lfn;	/* Pointer to LFN working buffer */
  #define INIT_NAMBUF(fs)	{ lfn = ff_memalloc((FF_MAX_LFN+1)*2); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; }
  #define FREE_NAMBUF()	ff_memfree(lfn)
  #endif
  #define LEAVE_MKFS(res)	{ if (!work) ff_memfree(buf); return res; }
  #define MAX_MALLOC	0x8000	/* Must be >=FF_MAX_SS */
  
  #else
  #error Wrong setting of FF_USE_LFN
  
  #endif	/* FF_USE_LFN == 1 */
  #endif	/* FF_USE_LFN == 0 */
  
  
  
  /*--------------------------------*/
  /* Code conversion tables         */
  /*--------------------------------*/
  
  #if FF_CODE_PAGE == 0	/* Run-time code page configuration */
  #define CODEPAGE CodePage
  static WORD CodePage;	/* Current code page */
  static const BYTE *ExCvt, *DbcTbl;	/* Pointer to current SBCS up-case table and DBCS code range table below */
  
  static const BYTE Ct437[] = TBL_CT437;
  static const BYTE Ct720[] = TBL_CT720;
  static const BYTE Ct737[] = TBL_CT737;
  static const BYTE Ct771[] = TBL_CT771;
  static const BYTE Ct775[] = TBL_CT775;
  static const BYTE Ct850[] = TBL_CT850;
  static const BYTE Ct852[] = TBL_CT852;
  static const BYTE Ct855[] = TBL_CT855;
  static const BYTE Ct857[] = TBL_CT857;
  static const BYTE Ct860[] = TBL_CT860;
  static const BYTE Ct861[] = TBL_CT861;
  static const BYTE Ct862[] = TBL_CT862;
  static const BYTE Ct863[] = TBL_CT863;
  static const BYTE Ct864[] = TBL_CT864;
  static const BYTE Ct865[] = TBL_CT865;
  static const BYTE Ct866[] = TBL_CT866;
  static const BYTE Ct869[] = TBL_CT869;
  static const BYTE Dc932[] = TBL_DC932;
  static const BYTE Dc936[] = TBL_DC936;
  static const BYTE Dc949[] = TBL_DC949;
  static const BYTE Dc950[] = TBL_DC950;
  
  #elif FF_CODE_PAGE < 900	/* Static code page configuration (SBCS) */
  #define CODEPAGE FF_CODE_PAGE
  static const BYTE ExCvt[] = MKCVTBL(TBL_CT, FF_CODE_PAGE);
  
  #else					/* Static code page configuration (DBCS) */
  #define CODEPAGE FF_CODE_PAGE
  static const BYTE DbcTbl[] = MKCVTBL(TBL_DC, FF_CODE_PAGE);
  
  #endif
  
  
  
  
  /*--------------------------------------------------------------------------
  
     Module Private Functions
  
  ---------------------------------------------------------------------------*/
  
  
  /*-----------------------------------------------------------------------*/
  /* Load/Store multi-byte word in the FAT structure                       */
  /*-----------------------------------------------------------------------*/
  
  static WORD ld_word (const BYTE* ptr)	/*	 Load a 2-byte little-endian word */
  {
  	WORD rv;
  
  	rv = ptr[1];
  	rv = rv << 8 | ptr[0];
  	return rv;
  }
  
  static DWORD ld_dword (const BYTE* ptr)	/* Load a 4-byte little-endian word */
  {
  	DWORD rv;
  
  	rv = ptr[3];
  	rv = rv << 8 | ptr[2];
  	rv = rv << 8 | ptr[1];
  	rv = rv << 8 | ptr[0];
  	return rv;
  }
  
  #if FF_FS_EXFAT
  static QWORD ld_qword (const BYTE* ptr)	/* Load an 8-byte little-endian word */
  {
  	QWORD rv;
  
  	rv = ptr[7];
  	rv = rv << 8 | ptr[6];
  	rv = rv << 8 | ptr[5];
  	rv = rv << 8 | ptr[4];
  	rv = rv << 8 | ptr[3];
  	rv = rv << 8 | ptr[2];
  	rv = rv << 8 | ptr[1];
  	rv = rv << 8 | ptr[0];
  	return rv;
  }
  #endif
  
  #if !FF_FS_READONLY
  static void st_word (BYTE* ptr, WORD val)	/* Store a 2-byte word in little-endian */
  {
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val;
  }
  
  static void st_dword (BYTE* ptr, DWORD val)	/* Store a 4-byte word in little-endian */
  {
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val;
  }
  
  #if FF_FS_EXFAT
  static void st_qword (BYTE* ptr, QWORD val)	/* Store an 8-byte word in little-endian */
  {
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val; val >>= 8;
  	*ptr++ = (BYTE)val;
  }
  #endif
  #endif	/* !FF_FS_READONLY */
  
  
  
  /*-----------------------------------------------------------------------*/
  /* String functions                                                      */
  /*-----------------------------------------------------------------------*/
  
  /* Test if the byte is DBC 1st byte */
  static int dbc_1st (BYTE c)
  {
  #if FF_CODE_PAGE == 0		/* Variable code page */
  	if (DbcTbl && c >= DbcTbl[0]) {
  		if (c <= DbcTbl[1]) return 1;					/* 1st byte range 1 */
  		if (c >= DbcTbl[2] && c <= DbcTbl[3]) return 1;	/* 1st byte range 2 */
  	}
  #elif FF_CODE_PAGE >= 900	/* DBCS fixed code page */
  	if (c >= DbcTbl[0]) {
  		if (c <= DbcTbl[1]) return 1;
  		if (c >= DbcTbl[2] && c <= DbcTbl[3]) return 1;
  	}
  #else						/* SBCS fixed code page */
  	if (c != 0) return 0;	/* Always false */
  #endif
  	return 0;
  }
  
  
  /* Test if the byte is DBC 2nd byte */
  static int dbc_2nd (BYTE c)
  {
  #if FF_CODE_PAGE == 0		/* Variable code page */
  	if (DbcTbl && c >= DbcTbl[4]) {
  		if (c <= DbcTbl[5]) return 1;					/* 2nd byte range 1 */
  		if (c >= DbcTbl[6] && c <= DbcTbl[7]) return 1;	/* 2nd byte range 2 */
  		if (c >= DbcTbl[8] && c <= DbcTbl[9]) return 1;	/* 2nd byte range 3 */
  	}
  #elif FF_CODE_PAGE >= 900	/* DBCS fixed code page */
  	if (c >= DbcTbl[4]) {
  		if (c <= DbcTbl[5]) return 1;
  		if (c >= DbcTbl[6] && c <= DbcTbl[7]) return 1;
  		if (c >= DbcTbl[8] && c <= DbcTbl[9]) return 1;
  	}
  #else						/* SBCS fixed code page */
  	if (c != 0) return 0;	/* Always false */
  #endif
  	return 0;
  }
  
  
  #if FF_USE_LFN
  
  /* Get a Unicode code point from the TCHAR string in defined API encodeing */
  static DWORD tchar2uni (	/* Returns a character in UTF-16 encoding (>=0x10000 on surrogate pair, 0xFFFFFFFF on decode error) */
  	const TCHAR** str		/* Pointer to pointer to TCHAR string in configured encoding */
  )
  {
  	DWORD uc;
  	const TCHAR *p = *str;
  
  #if FF_LFN_UNICODE == 1		/* UTF-16 input */
  	WCHAR wc;
  
  	uc = *p++;	/* Get a unit */
  	if (IsSurrogate(uc)) {	/* Surrogate? */
  		wc = *p++;		/* Get low surrogate */
  		if (!IsSurrogateH(uc) || !IsSurrogateL(wc)) return 0xFFFFFFFF;	/* Wrong surrogate? */
  		uc = uc << 16 | wc;
  	}
  
  #elif FF_LFN_UNICODE == 2	/* UTF-8 input */
  	BYTE b;
  	int nf;
  
  	uc = (BYTE)*p++;	/* Get an encoding unit */
  	if (uc & 0x80) {	/* Multiple byte code? */
  		if        ((uc & 0xE0) == 0xC0) {	/* 2-byte sequence? */
  			uc &= 0x1F; nf = 1;
  		} else if ((uc & 0xF0) == 0xE0) {	/* 3-byte sequence? */
  			uc &= 0x0F; nf = 2;
  		} else if ((uc & 0xF8) == 0xF0) {	/* 4-byte sequence? */
  			uc &= 0x07; nf = 3;
  		} else {							/* Wrong sequence */
  			return 0xFFFFFFFF;
  		}
  		do {	/* Get trailing bytes */
  			b = (BYTE)*p++;
  			if ((b & 0xC0) != 0x80) return 0xFFFFFFFF;	/* Wrong sequence? */
  			uc = uc << 6 | (b & 0x3F);
  		} while (--nf != 0);
  		if (uc < 0x80 || IsSurrogate(uc) || uc >= 0x110000) return 0xFFFFFFFF;	/* Wrong code? */
  		if (uc >= 0x010000) uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF);	/* Make a surrogate pair if needed */
  	}
  
  #elif FF_LFN_UNICODE == 3	/* UTF-32 input */
  	uc = (TCHAR)*p++;	/* Get a unit */
  	if (uc >= 0x110000 || IsSurrogate(uc)) return 0xFFFFFFFF;	/* Wrong code? */
  	if (uc >= 0x010000) uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF);	/* Make a surrogate pair if needed */
  
  #else		/* ANSI/OEM input */
  	BYTE b;
  	WCHAR wc;
  
  	wc = (BYTE)*p++;			/* Get a byte */
  	if (dbc_1st((BYTE)wc)) {	/* Is it a DBC 1st byte? */
  		b = (BYTE)*p++;			/* Get 2nd byte */
  		if (!dbc_2nd(b)) return 0xFFFFFFFF;	/* Invalid code? */
  		wc = (wc << 8) + b;		/* Make a DBC */
  	}
  	if (wc != 0) {
  		wc = ff_oem2uni(wc, CODEPAGE);	/* ANSI/OEM ==> Unicode */
  		if (wc == 0) return 0xFFFFFFFF;	/* Invalid code? */
  	}
  	uc = wc;
  
  #endif
  	*str = p;	/* Next read pointer */
  	return uc;
  }
  
  
  /* 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 */
  )
  {
  #if FF_LFN_UNICODE == 1	/* UTF-16 output */
  	WCHAR hs, wc;
  
  	hs = (WCHAR)(chr >> 16);
  	wc = (WCHAR)chr;
  	if (hs == 0) {	/* Single encoding unit? */
  		if (szb < 1 || IsSurrogate(wc)) return 0;	/* Buffer overflow or wrong code? */
  		*buf = wc;
  		return 1;
  	}
  	if (szb < 2 || !IsSurrogateH(hs) || !IsSurrogateL(wc)) return 0;	/* Buffer overflow or wrong surrogate? */
  	*buf++ = hs;
  	*buf++ = wc;
  	return 2;
  
  #elif FF_LFN_UNICODE == 2	/* UTF-8 output */
  	DWORD hc;
  
  	if (chr < 0x80) {	/* Single byte code? */
  		if (szb < 1) return 0;	/* Buffer overflow? */
  		*buf = (TCHAR)chr;
  		return 1;
  	}
  	if (chr < 0x800) {	/* 2-byte sequence? */
  		if (szb < 2) return 0;	/* Buffer overflow? */
  		*buf++ = (TCHAR)(0xC0 | (chr >> 6 & 0x1F));
  		*buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
  		return 2;
  	}
  	if (chr < 0x10000) {	/* 3-byte sequence? */
  		if (szb < 3 || IsSurrogate(chr)) return 0;	/* Buffer overflow or wrong code? */
  		*buf++ = (TCHAR)(0xE0 | (chr >> 12 & 0x0F));
  		*buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
  		*buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
  		return 3;
  	}
  	/* 4-byte sequence */
  	if (szb < 4) return 0;	/* Buffer overflow? */
  	hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6;	/* Get high 10 bits */
  	chr = (chr & 0xFFFF) - 0xDC00;					/* Get low 10 bits */
  	if (hc >= 0x100000 || chr >= 0x400) return 0;	/* Wrong surrogate? */
  	chr = (hc | chr) + 0x10000;
  	*buf++ = (TCHAR)(0xF0 | (chr >> 18 & 0x07));
  	*buf++ = (TCHAR)(0x80 | (chr >> 12 & 0x3F));
  	*buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
  	*buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
  	return 4;
  
  #elif FF_LFN_UNICODE == 3	/* UTF-32 output */
  	DWORD hc;
  
  	if (szb < 1) return 0;	/* Buffer overflow? */
  	if (chr >= 0x10000) {	/* Out of BMP? */
  		hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6;	/* Get high 10 bits */
  		chr = (chr & 0xFFFF) - 0xDC00;					/* Get low 10 bits */
  		if (hc >= 0x100000 || chr >= 0x400) return 0;	/* Wrong surrogate? */
  		chr = (hc | chr) + 0x10000;
  	}
  	*buf++ = (TCHAR)chr;
  	return 1;
  
  #else						/* ANSI/OEM output */
  	WCHAR wc;
  
  	wc = ff_uni2oem(chr, CODEPAGE);
  	if (wc >= 0x100) {	/* Is this a DBC? */
  		if (szb < 2) return 0;
  		*buf++ = (char)(wc >> 8);	/* Store DBC 1st byte */
  		*buf++ = (TCHAR)wc;			/* Store DBC 2nd byte */
  		return 2;
  	}
  	if (wc == 0 || szb < 1) return 0;	/* Invalid char or buffer overflow? */
  	*buf++ = (TCHAR)wc;					/* Store the character */
  	return 1;
  #endif
  }
  #endif	/* FF_USE_LFN */
  
  
  #if FF_FS_REENTRANT
  /*-----------------------------------------------------------------------*/
  /* Request/Release grant to access the volume                            */
  /*-----------------------------------------------------------------------*/
  static int lock_fs (		/* 1:Ok, 0:timeout */
  	FATFS* fs		/* Filesystem object */
  )
  {
  	return ff_req_grant(fs->sobj);
  }
  
  
  static void unlock_fs (
  	FATFS* fs,		/* Filesystem object */
  	FRESULT res		/* Result code to be returned */
  )
  {
  	if (fs && res != FR_NOT_ENABLED && res != FR_INVALID_DRIVE && res != FR_TIMEOUT) {
  		ff_rel_grant(fs->sobj);
  	}
  }
  
  #endif
  
  
  
  #if FF_FS_LOCK != 0
  /*-----------------------------------------------------------------------*/
  /* File lock control functions                                           */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT chk_lock (	/* Check if the file can be accessed */
  	DIR* dp,		/* Directory object pointing the file to be checked */
  	int acc			/* Desired access type (0:Read mode open, 1:Write mode open, 2:Delete or rename) */
  )
  {
  	UINT i, be;
  
  	/* Search open object table for the object */
  	be = 0;
  	for (i = 0; i < FF_FS_LOCK; i++) {
  		if (Files[i].fs) {	/* Existing entry */
  			if (Files[i].fs == dp->obj.fs &&	 	/* Check if the object matches with an open object */
  				Files[i].clu == dp->obj.sclust &&
  				Files[i].ofs == dp->dptr) break;
  		} else {			/* Blank entry */
  			be = 1;
  		}
  	}
  	if (i == FF_FS_LOCK) {	/* The object has not been opened */
  		return (!be && acc != 2) ? FR_TOO_MANY_OPEN_FILES : FR_OK;	/* Is there a blank entry for new object? */
  	}
  
  	/* The object was opened. Reject any open against writing file and all write mode open */
  	return (acc != 0 || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
  }
  
  
  static int enq_lock (void)	/* Check if an entry is available for a new object */
  {
  	UINT i;
  
  	for (i = 0; i < FF_FS_LOCK && Files[i].fs; i++) ;
  	return (i == FF_FS_LOCK) ? 0 : 1;
  }
  
  
  static UINT inc_lock (	/* Increment object open counter and returns its index (0:Internal error) */
  	DIR* dp,	/* Directory object pointing the file to register or increment */
  	int acc		/* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
  )
  {
  	UINT i;
  
  
  	for (i = 0; i < FF_FS_LOCK; i++) {	/* Find the object */
  		if (Files[i].fs == dp->obj.fs
  		 && Files[i].clu == dp->obj.sclust
  		 && Files[i].ofs == dp->dptr) break;
  	}
  
  	if (i == FF_FS_LOCK) {			/* Not opened. Register it as new. */
  		for (i = 0; i < FF_FS_LOCK && Files[i].fs; i++) ;
  		if (i == FF_FS_LOCK) return 0;	/* No free entry to register (int err) */
  		Files[i].fs = dp->obj.fs;
  		Files[i].clu = dp->obj.sclust;
  		Files[i].ofs = dp->dptr;
  		Files[i].ctr = 0;
  	}
  
  	if (acc >= 1 && Files[i].ctr) return 0;	/* Access violation (int err) */
  
  	Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;	/* Set semaphore value */
  
  	return i + 1;	/* Index number origin from 1 */
  }
  
  
  static FRESULT dec_lock (	/* Decrement object open counter */
  	UINT i			/* Semaphore index (1..) */
  )
  {
  	WORD n;
  	FRESULT res;
  
  
  	if (--i < FF_FS_LOCK) {	/* Index number origin from 0 */
  		n = Files[i].ctr;
  		if (n == 0x100) n = 0;	/* If write mode open, delete the entry */
  		if (n > 0) n--;			/* Decrement read mode open count */
  		Files[i].ctr = n;
  		if (n == 0) Files[i].fs = 0;	/* Delete the entry if open count gets zero */
  		res = FR_OK;
  	} else {
  		res = FR_INT_ERR;		/* Invalid index nunber */
  	}
  	return res;
  }
  
  
  static void clear_lock (	/* Clear lock entries of the volume */
  	FATFS *fs
  )
  {
  	UINT i;
  
  	for (i = 0; i < FF_FS_LOCK; i++) {
  		if (Files[i].fs == fs) Files[i].fs = 0;
  	}
  }
  
  #endif	/* FF_FS_LOCK != 0 */
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Move/Flush disk access window in the filesystem object                */
  /*-----------------------------------------------------------------------*/
  #if !FF_FS_READONLY
  static FRESULT sync_window (	/* Returns FR_OK or FR_DISK_ERR */
  	FATFS* fs			/* Filesystem object */
  )
  {
  	FRESULT res = FR_OK;
  
  
  	if (fs->wflag) {	/* Is the disk access window dirty? */
  		if (disk_write(fs->pdrv, fs->win, fs->winsect, 1) == RES_OK) {	/* Write it back into the volume */
  			fs->wflag = 0;	/* Clear window dirty flag */
  			if (fs->winsect - fs->fatbase < fs->fsize) {	/* Is it in the 1st FAT? */
  				if (fs->n_fats == 2) disk_write(fs->pdrv, fs->win, fs->winsect + fs->fsize, 1);	/* Reflect it to 2nd FAT if needed */
  			}
  		} else {
  			res = FR_DISK_ERR;
  		}
  	}
  	return res;
  }
  #endif
  
  
  static FRESULT move_window (	/* Returns FR_OK or FR_DISK_ERR */
  	FATFS* fs,		/* Filesystem object */
  	LBA_t sect		/* Sector LBA to make appearance in the fs->win[] */
  )
  {
  	FRESULT res = FR_OK;
  
  
  	if (sect != fs->winsect) {	/* Window offset changed? */
  #if !FF_FS_READONLY
  		res = sync_window(fs);		/* Flush the window */
  #endif
  		if (res == FR_OK) {			/* Fill sector window with new data */
  			if (disk_read(fs->pdrv, fs->win, sect, 1) != RES_OK) {
  				sect = (LBA_t)0 - 1;	/* Invalidate window if read data is not valid */
  				res = FR_DISK_ERR;
  			}
  			fs->winsect = sect;
  		}
  	}
  	return res;
  }
  
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Synchronize filesystem and data on the storage                        */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT sync_fs (	/* Returns FR_OK or FR_DISK_ERR */
  	FATFS* fs		/* Filesystem object */
  )
  {
  	FRESULT res;
  
  
  	res = sync_window(fs);
  	if (res == FR_OK) {
  		if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {	/* FAT32: Update FSInfo sector if needed */
  			/* Create FSInfo structure */
  			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;
  }
  
  #endif
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Get physical sector number from cluster number                        */
  /*-----------------------------------------------------------------------*/
  
  static LBA_t clst2sect (	/* !=0:Sector number, 0:Failed (invalid cluster#) */
  	FATFS* fs,		/* Filesystem object */
  	DWORD clst		/* Cluster# to be converted */
  )
  {
  	clst -= 2;		/* Cluster number is origin from 2 */
  	if (clst >= fs->n_fatent - 2) return 0;		/* Is it invalid cluster number? */
  	return fs->database + (LBA_t)fs->csize * clst;	/* Start sector number of the cluster */
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* FAT access - Read value of 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, bc;
  	DWORD val;
  	FATFS *fs = obj->fs;
  
  
  	if (clst < 2 || clst >= fs->n_fatent) {	/* Check if in valid range */
  		val = 1;	/* Internal error */
  
  	} else {
  		val = 0xFFFFFFFF;	/* Default value falls on disk error */
  
  		switch (fs->fs_type) {
  		case FS_FAT12 :
  			bc = (UINT)clst; bc += bc / 2;
  			if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
  			wc = fs->win[bc++ % SS(fs)];		/* Get 1st byte of the entry */
  			if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
  			wc |= fs->win[bc % SS(fs)] << 8;	/* Merge 2nd byte of the entry */
  			val = (clst & 1) ? (wc >> 4) : (wc & 0xFFF);	/* Adjust bit position */
  			break;
  
  		case FS_FAT16 :
  			if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))) != FR_OK) break;
  			val = ld_word(fs->win + clst * 2 % SS(fs));		/* Simple WORD array */
  			break;
  
  		case FS_FAT32 :
  			if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
  			val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x0FFFFFFF;	/* Simple DWORD array but mask out upper 4 bits */
  			break;
  #if FF_FS_EXFAT
  		case FS_EXFAT :
  			if ((obj->objsize != 0 && obj->sclust != 0) || obj->stat == 0) {	/* Object except root dir must have valid data length */
  				DWORD cofs = clst - obj->sclust;	/* Offset from start cluster */
  				DWORD clen = (DWORD)((LBA_t)((obj->objsize - 1) / SS(fs)) / fs->csize);	/* Number of clusters - 1 */
  
  				if (obj->stat == 2 && cofs <= clen) {	/* Is it a contiguous chain? */
  					val = (cofs == clen) ? 0x7FFFFFFF : clst + 1;	/* No data on the FAT, generate the value */
  					break;
  				}
  				if (obj->stat == 3 && cofs < obj->n_cont) {	/* Is it in the 1st fragment? */
  					val = clst + 1; 	/* Generate the value */
  					break;
  				}
  				if (obj->stat != 2) {	/* Get value from FAT if FAT chain is valid */
  					if (obj->n_frag != 0) {	/* Is it on the growing edge? */
  						val = 0x7FFFFFFF;	/* Generate EOC */
  					} else {
  						if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
  						val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x7FFFFFFF;
  					}
  					break;
  				}
  			}
  			val = 1;	/* Internal error */
  			break;
  #endif
  		default:
  			val = 1;	/* Internal error */
  		}
  	}
  
  	return val;
  }
  
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* FAT access - Change value of 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;
  	BYTE *p;
  	FRESULT res = FR_INT_ERR;
  
  
  	if (clst >= 2 && clst < fs->n_fatent) {	/* Check if in valid range */
  		switch (fs->fs_type) {
  		case FS_FAT12:
  			bc = (UINT)clst; bc += bc / 2;	/* bc: byte offset of the entry */
  			res = move_window(fs, fs->fatbase + (bc / SS(fs)));
  			if (res != FR_OK) break;
  			p = fs->win + bc++ % SS(fs);
  			*p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;	/* Update 1st byte */
  			fs->wflag = 1;
  			res = move_window(fs, fs->fatbase + (bc / SS(fs)));
  			if (res != FR_OK) break;
  			p = fs->win + bc % SS(fs);
  			*p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));	/* Update 2nd byte */
  			fs->wflag = 1;
  			break;
  
  		case FS_FAT16:
  			res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
  			if (res != FR_OK) break;
  			st_word(fs->win + clst * 2 % SS(fs), (WORD)val);	/* Simple WORD array */
  			fs->wflag = 1;
  			break;
  
  		case FS_FAT32:
  #if FF_FS_EXFAT
  		case FS_EXFAT:
  #endif
  			res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
  			if (res != FR_OK) break;
  			if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {
  				val = (val & 0x0FFFFFFF) | (ld_dword(fs->win + clst * 4 % SS(fs)) & 0xF0000000);
  			}
  			st_dword(fs->win + clst * 4 % SS(fs), val);
  			fs->wflag = 1;
  			break;
  		}
  	}
  	return res;
  }
  
  #endif /* !FF_FS_READONLY */
  
  
  
  
  #if FF_FS_EXFAT && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* exFAT: Accessing FAT and Allocation Bitmap                            */
  /*-----------------------------------------------------------------------*/
  
  /*--------------------------------------*/
  /* Find a contiguous free cluster block */
  /*--------------------------------------*/
  
  static DWORD find_bitmap (	/* 0:Not found, 2..:Cluster block found, 0xFFFFFFFF:Disk error */
  	FATFS* fs,	/* Filesystem object */
  	DWORD clst,	/* Cluster number to scan from */
  	DWORD ncl	/* Number of contiguous clusters to find (1..) */
  )
  {
  	BYTE bm, bv;
  	UINT i;
  	DWORD val, scl, ctr;
  
  
  	clst -= 2;	/* The first bit in the bitmap corresponds to cluster #2 */
  	if (clst >= fs->n_fatent - 2) clst = 0;
  	scl = val = clst; ctr = 0;
  	for (;;) {
  		if (move_window(fs, fs->bitbase + val / 8 / SS(fs)) != FR_OK) return 0xFFFFFFFF;
  		i = val / 8 % SS(fs); bm = 1 << (val % 8);
  		do {
  			do {
  				bv = fs->win[i] & bm; bm <<= 1;		/* Get bit value */
  				if (++val >= fs->n_fatent - 2) {	/* Next cluster (with wrap-around) */
  					val = 0; bm = 0; i = SS(fs);
  				}
  				if (bv == 0) {	/* Is it a free cluster? */
  					if (++ctr == ncl) return scl + 2;	/* Check if run length is sufficient for required */
  				} else {
  					scl = val; ctr = 0;		/* Encountered a cluster in-use, restart to scan */
  				}
  				if (val == clst) return 0;	/* All cluster scanned? */
  			} while (bm != 0);
  			bm = 1;
  		} while (++i < SS(fs));
  	}
  }
  
  
  /*----------------------------------------*/
  /* Set/Clear a block of allocation bitmap */
  /*----------------------------------------*/
  
  static FRESULT change_bitmap (
  	FATFS* fs,	/* Filesystem object */
  	DWORD clst,	/* Cluster number to change from */
  	DWORD ncl,	/* Number of clusters to be changed */
  	int bv		/* bit value to be set (0 or 1) */
  )
  {
  	BYTE bm;
  	UINT i;
  	LBA_t sect;
  
  
  	clst -= 2;	/* The first bit corresponds to cluster #2 */
  	sect = fs->bitbase + clst / 8 / SS(fs);	/* Sector address */
  	i = clst / 8 % SS(fs);					/* Byte offset in the sector */
  	bm = 1 << (clst % 8);					/* Bit mask in the byte */
  	for (;;) {
  		if (move_window(fs, sect++) != FR_OK) return FR_DISK_ERR;
  		do {
  			do {
  				if (bv == (int)((fs->win[i] & bm) != 0)) return FR_INT_ERR;	/* Is the bit expected value? */
  				fs->win[i] ^= bm;	/* Flip the bit */
  				fs->wflag = 1;
  				if (--ncl == 0) return FR_OK;	/* All bits processed? */
  			} while (bm <<= 1);		/* Next bit */
  			bm = 1;
  		} while (++i < SS(fs));		/* Next byte */
  		i = 0;
  	}
  }
  
  
  /*---------------------------------------------*/
  /* Fill the first fragment of the FAT chain    */
  /*---------------------------------------------*/
  
  static FRESULT fill_first_frag (
  	FFOBJID* obj	/* Pointer to the corresponding object */
  )
  {
  	FRESULT res;
  	DWORD cl, n;
  
  
  	if (obj->stat == 3) {	/* Has the object been changed 'fragmented' in this session? */
  		for (cl = obj->sclust, n = obj->n_cont; n; cl++, n--) {	/* Create cluster chain on the FAT */
  			res = put_fat(obj->fs, cl, cl + 1);
  			if (res != FR_OK) return res;
  		}
  		obj->stat = 0;	/* Change status 'FAT chain is valid' */
  	}
  	return FR_OK;
  }
  
  
  /*---------------------------------------------*/
  /* Fill the last fragment of the FAT chain     */
  /*---------------------------------------------*/
  
  static FRESULT fill_last_frag (
  	FFOBJID* obj,	/* Pointer to the corresponding object */
  	DWORD lcl,		/* Last cluster of the fragment */
  	DWORD term		/* Value to set the last FAT entry */
  )
  {
  	FRESULT res;
  
  
  	while (obj->n_frag > 0) {	/* Create the chain of last fragment */
  		res = put_fat(obj->fs, lcl - obj->n_frag + 1, (obj->n_frag > 1) ? lcl - obj->n_frag + 2 : term);
  		if (res != FR_OK) return res;
  		obj->n_frag--;
  	}
  	return FR_OK;
  }
  
  #endif	/* FF_FS_EXFAT && !FF_FS_READONLY */
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* FAT handling - Remove a cluster chain                                 */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT remove_chain (	/* FR_OK(0):succeeded, !=0:error */
  	FFOBJID* obj,		/* Corresponding object */
  	DWORD clst,			/* Cluster to remove a chain from */
  	DWORD pclst			/* Previous cluster of clst (0 if entire chain) */
  )
  {
  	FRESULT res = FR_OK;
  	DWORD nxt;
  	FATFS *fs = obj->fs;
  #if FF_FS_EXFAT || FF_USE_TRIM
  	DWORD scl = clst, ecl = clst;
  #endif
  #if FF_USE_TRIM
  	LBA_t rt[2];
  #endif
  
  	if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR;	/* Check if in valid range */
  
  	/* Mark the previous cluster 'EOC' on the FAT if it exists */
  	if (pclst != 0 && (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT || obj->stat != 2)) {
  		res = put_fat(fs, pclst, 0xFFFFFFFF);
  		if (res != FR_OK) return res;
  	}
  
  	/* Remove the chain */
  	do {
  		nxt = get_fat(obj, clst);			/* Get cluster status */
  		if (nxt == 0) break;				/* Empty cluster? */
  		if (nxt == 1) return FR_INT_ERR;	/* Internal error? */
  		if (nxt == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error? */
  		if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {
  			res = put_fat(fs, clst, 0);		/* Mark the cluster 'free' on the FAT */
  			if (res != FR_OK) return res;
  		}
  		if (fs->free_clst < fs->n_fatent - 2) {	/* Update FSINFO */
  			fs->free_clst++;
  			fs->fsi_flag |= 1;
  		}
  #if FF_FS_EXFAT || FF_USE_TRIM
  		if (ecl + 1 == nxt) {	/* Is next cluster contiguous? */
  			ecl = nxt;
  		} else {				/* End of contiguous cluster block */
  #if FF_FS_EXFAT
  			if (fs->fs_type == FS_EXFAT) {
  				res = change_bitmap(fs, scl, ecl - scl + 1, 0);	/* Mark the cluster block 'free' on the bitmap */
  				if (res != FR_OK) return res;
  			}
  #endif
  #if FF_USE_TRIM
  			rt[0] = clst2sect(fs, scl);					/* Start of data area to be freed */
  			rt[1] = clst2sect(fs, ecl) + fs->csize - 1;	/* End of data area to be freed */
  			disk_ioctl(fs->pdrv, CTRL_TRIM, rt);		/* Inform storage device that the data in the block may be erased */
  #endif
  			scl = ecl = nxt;
  		}
  #endif
  		clst = nxt;					/* Next cluster */
  	} while (clst < fs->n_fatent);	/* Repeat while not the last link */
  
  #if FF_FS_EXFAT
  	/* Some post processes for chain status */
  	if (fs->fs_type == FS_EXFAT) {
  		if (pclst == 0) {	/* Has the entire chain been removed? */
  			obj->stat = 0;		/* Change the chain status 'initial' */
  		} else {
  			if (obj->stat == 0) {	/* Is it a fragmented chain from the beginning of this session? */
  				clst = obj->sclust;		/* Follow the chain to check if it gets contiguous */
  				while (clst != pclst) {
  					nxt = get_fat(obj, clst);
  					if (nxt < 2) return FR_INT_ERR;
  					if (nxt == 0xFFFFFFFF) return FR_DISK_ERR;
  					if (nxt != clst + 1) break;	/* Not contiguous? */
  					clst++;
  				}
  				if (clst == pclst) {	/* Has the chain got contiguous again? */
  					obj->stat = 2;		/* Change the chain status 'contiguous' */
  				}
  			} else {
  				if (obj->stat == 3 && pclst >= obj->sclust && pclst <= obj->sclust + obj->n_cont) {	/* Was the chain fragmented in this session and got contiguous again? */
  					obj->stat = 2;	/* Change the chain status 'contiguous' */
  				}
  			}
  		}
  	}
  #endif
  	return FR_OK;
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* FAT handling - Stretch a chain or Create a new chain                  */
  /*-----------------------------------------------------------------------*/
  
  static DWORD create_chain (	/* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
  	FFOBJID* obj,		/* Corresponding object */
  	DWORD clst			/* Cluster# to stretch, 0:Create a new chain */
  )
  {
  	DWORD cs, ncl, scl;
  	FRESULT res;
  	FATFS *fs = obj->fs;
  
  
  	if (clst == 0) {	/* Create a new chain */
  		scl = fs->last_clst;				/* Suggested cluster to start to find */
  		if (scl == 0 || scl >= fs->n_fatent) scl = 1;
  	}
  	else {				/* Stretch a chain */
  		cs = get_fat(obj, clst);			/* Check the cluster status */
  		if (cs < 2) return 1;				/* Test for insanity */
  		if (cs == 0xFFFFFFFF) return cs;	/* Test for disk error */
  		if (cs < fs->n_fatent) return cs;	/* It is already followed by next cluster */
  		scl = clst;							/* Cluster to start to find */
  	}
  	if (fs->free_clst == 0) return 0;		/* No free cluster */
  
  #if FF_FS_EXFAT
  	if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
  		ncl = find_bitmap(fs, scl, 1);				/* Find a free cluster */
  		if (ncl == 0 || ncl == 0xFFFFFFFF) return ncl;	/* No free cluster or hard error? */
  		res = change_bitmap(fs, ncl, 1, 1);			/* Mark the cluster 'in use' */
  		if (res == FR_INT_ERR) return 1;
  		if (res == FR_DISK_ERR) return 0xFFFFFFFF;
  		if (clst == 0) {							/* Is it a new chain? */
  			obj->stat = 2;							/* Set status 'contiguous' */
  		} else {									/* It is a stretched chain */
  			if (obj->stat == 2 && ncl != scl + 1) {	/* Is the chain got fragmented? */
  				obj->n_cont = scl - obj->sclust;	/* Set size of the contiguous part */
  				obj->stat = 3;						/* Change status 'just fragmented' */
  			}
  		}
  		if (obj->stat != 2) {	/* Is the file non-contiguous? */
  			if (ncl == clst + 1) {	/* Is the cluster next to previous one? */
  				obj->n_frag = obj->n_frag ? obj->n_frag + 1 : 2;	/* Increment size of last framgent */
  			} else {				/* New fragment */
  				if (obj->n_frag == 0) obj->n_frag = 1;
  				res = fill_last_frag(obj, clst, ncl);	/* Fill last fragment on the FAT and link it to new one */
  				if (res == FR_OK) obj->n_frag = 1;
  			}
  		}
  	} else
  #endif
  	{	/* On the FAT/FAT32 volume */
  		ncl = 0;
  		if (scl == clst) {						/* Stretching an existing chain? */
  			ncl = scl + 1;						/* Test if next cluster is free */
  			if (ncl >= fs->n_fatent) ncl = 2;
  			cs = get_fat(obj, ncl);				/* Get next cluster status */
  			if (cs == 1 || cs == 0xFFFFFFFF) return cs;	/* Test for error */
  			if (cs != 0) {						/* Not free? */
  				cs = fs->last_clst;				/* Start at suggested cluster if it is valid */
  				if (cs >= 2 && cs < fs->n_fatent) scl = cs;
  				ncl = 0;
  			}
  		}
  		if (ncl == 0) {	/* The new cluster cannot be contiguous and find another fragment */
  			ncl = scl;	/* Start cluster */
  			for (;;) {
  				ncl++;							/* Next cluster */
  				if (ncl >= fs->n_fatent) {		/* Check wrap-around */
  					ncl = 2;
  					if (ncl > scl) return 0;	/* No free cluster found? */
  				}
  				cs = get_fat(obj, ncl);			/* Get the cluster status */
  				if (cs == 0) break;				/* Found a free cluster? */
  				if (cs == 1 || cs == 0xFFFFFFFF) return cs;	/* Test for error */
  				if (ncl == scl) return 0;		/* No free cluster found? */
  			}
  		}
  		res = put_fat(fs, ncl, 0xFFFFFFFF);		/* Mark the new cluster 'EOC' */
  		if (res == FR_OK && clst != 0) {
  			res = put_fat(fs, clst, ncl);		/* Link it from the previous one if needed */
  		}
  	}
  
  	if (res == FR_OK) {			/* Update FSINFO if function succeeded. */
  		fs->last_clst = ncl;
  		if (fs->free_clst <= fs->n_fatent - 2) fs->free_clst--;
  		fs->fsi_flag |= 1;
  	} else {
  		ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;	/* Failed. Generate error status */
  	}
  
  	return ncl;		/* Return new cluster number or error status */
  }
  
  #endif /* !FF_FS_READONLY */
  
  
  
  
  #if FF_USE_FASTSEEK
  /*-----------------------------------------------------------------------*/
  /* FAT handling - Convert offset into cluster with link map table        */
  /*-----------------------------------------------------------------------*/
  
  static DWORD clmt_clust (	/* <2:Error, >=2:Cluster number */
  	FIL* fp,		/* Pointer to the file object */
  	FSIZE_t ofs		/* File offset to be converted to cluster# */
  )
  {
  	DWORD cl, ncl, *tbl;
  	FATFS *fs = fp->obj.fs;
  
  
  	tbl = fp->cltbl + 1;	/* Top of CLMT */
  	cl = (DWORD)(ofs / SS(fs) / fs->csize);	/* Cluster order from top of the file */
  	for (;;) {
  		ncl = *tbl++;			/* Number of cluters in the fragment */
  		if (ncl == 0) return 0;	/* End of table? (error) */
  		if (cl < ncl) break;	/* In this fragment? */
  		cl -= ncl; tbl++;		/* Next fragment */
  	}
  	return cl + *tbl;	/* Return the cluster number */
  }
  
  #endif	/* FF_USE_FASTSEEK */
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Directory handling - Fill a cluster with zeros                        */
  /*-----------------------------------------------------------------------*/
  
  #if !FF_FS_READONLY
  static FRESULT dir_clear (	/* Returns FR_OK or FR_DISK_ERR */
  	FATFS *fs,		/* Filesystem object */
  	DWORD clst		/* Directory table to clear */
  )
  {
  	LBA_t sect;
  	UINT n, szb;
  	BYTE *ibuf;
  
  
  	if (sync_window(fs) != FR_OK) return FR_DISK_ERR;	/* Flush disk access window */
  	sect = clst2sect(fs, clst);		/* Top of the cluster */
  	fs->winsect = sect;				/* Set window to top of the cluster */
  	memset(fs->win, 0, sizeof fs->win);	/* Clear window buffer */
  #if FF_USE_LFN == 3		/* Quick table clear by using multi-secter write */
  	/* Allocate a temporary buffer */
  	for (szb = ((DWORD)fs->csize * SS(fs) >= MAX_MALLOC) ? MAX_MALLOC : fs->csize * SS(fs), ibuf = 0; szb > SS(fs) && (ibuf = ff_memalloc(szb)) == 0; szb /= 2) ;
  	if (szb > SS(fs)) {		/* Buffer allocated? */
  		memset(ibuf, 0, szb);
  		szb /= SS(fs);		/* Bytes -> Sectors */
  		for (n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;	/* Fill the cluster with 0 */
  		ff_memfree(ibuf);
  	} else
  #endif
  	{
  		ibuf = fs->win; szb = 1;	/* Use window buffer (many single-sector writes may take a time) */
  		for (n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;	/* Fill the cluster with 0 */
  	}
  	return (n == fs->csize) ? FR_OK : FR_DISK_ERR;
  }
  #endif	/* !FF_FS_READONLY */
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Directory handling - Set directory index                              */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT dir_sdi (	/* FR_OK(0):succeeded, !=0:error */
  	DIR* dp,		/* Pointer to directory object */
  	DWORD ofs		/* Offset of directory table */
  )
  {
  	DWORD csz, clst;
  	FATFS *fs = dp->obj.fs;
  
  
  	if (ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR) || ofs % SZDIRE) {	/* Check range of offset and alignment */
  		return FR_INT_ERR;
  	}
  	dp->dptr = ofs;				/* Set current offset */
  	clst = dp->obj.sclust;		/* Table start cluster (0:root) */
  	if (clst == 0 && fs->fs_type >= FS_FAT32) {	/* Replace cluster# 0 with root cluster# */
  		clst = (DWORD)fs->dirbase;
  		if (FF_FS_EXFAT) dp->obj.stat = 0;	/* exFAT: Root dir has an FAT chain */
  	}
  
  	if (clst == 0) {	/* Static table (root-directory on the FAT volume) */
  		if (ofs / SZDIRE >= fs->n_rootdir) return FR_INT_ERR;	/* Is index out of range? */
  		dp->sect = fs->dirbase;
  
  	} else {			/* Dynamic table (sub-directory or root-directory on the FAT32/exFAT volume) */
  		csz = (DWORD)fs->csize * SS(fs);	/* Bytes per cluster */
  		while (ofs >= csz) {				/* Follow cluster chain */
  			clst = get_fat(&dp->obj, clst);				/* Get next cluster */
  			if (clst == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error */
  			if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR;	/* Reached to end of table or internal error */
  			ofs -= csz;
  		}
  		dp->sect = clst2sect(fs, clst);
  	}
  	dp->clust = clst;					/* Current cluster# */
  	if (dp->sect == 0) return FR_INT_ERR;
  	dp->sect += ofs / SS(fs);			/* Sector# of the directory entry */
  	dp->dir = fs->win + (ofs % SS(fs));	/* Pointer to the entry in the win[] */
  
  	return FR_OK;
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Directory handling - Move directory table index next                  */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT dir_next (	/* FR_OK(0):succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
  	DIR* dp,				/* Pointer to the directory object */
  	int stretch				/* 0: Do not stretch table, 1: Stretch table if needed */
  )
  {
  	DWORD ofs, clst;
  	FATFS *fs = dp->obj.fs;
  
  	if(stretch)
  		fs->sclust = 0;
  
  	ofs = dp->dptr + SZDIRE;	/* Next entry */
  	if (ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR)) dp->sect = 0;	/* Disable it if the offset reached the max value */
  	if (dp->sect == 0) return FR_NO_FILE;	/* Report EOT if it has been disabled */
  
  	if (ofs % SS(fs) == 0) {	/* Sector changed? */
  		dp->sect++;				/* Next sector */
  
  		if (dp->clust == 0) {	/* Static table */
  			if (ofs / SZDIRE >= fs->n_rootdir) {	/* Report EOT if it reached end of static table */
  				dp->sect = 0; return FR_NO_FILE;
  			}
  		}
  		else {					/* Dynamic table */
  			if ((ofs / SS(fs) & (fs->csize - 1)) == 0) {	/* Cluster changed? */
  				clst = get_fat(&dp->obj, dp->clust);		/* Get next cluster */
  				if (clst <= 1) return FR_INT_ERR;			/* Internal error */
  				if (clst == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error */
  				if (clst >= fs->n_fatent) {					/* It reached end of dynamic table */
  #if !FF_FS_READONLY
  					if (!stretch) {								/* If no stretch, report EOT */
  						dp->sect = 0; return FR_NO_FILE;
  					}
  					clst = create_chain(&dp->obj, dp->clust);	/* Allocate a cluster */
  					if (clst == 0) return FR_DENIED;			/* No free cluster */
  					if (clst == 1) return FR_INT_ERR;			/* Internal error */
  					if (clst == 0xFFFFFFFF) return FR_DISK_ERR;	/* Disk error */
  					if (dir_clear(fs, clst) != FR_OK) return FR_DISK_ERR;	/* Clean up the stretched table */
  					if (FF_FS_EXFAT) dp->obj.stat |= 4;			/* exFAT: The directory has been stretched */
  #else
  					if (!stretch) dp->sect = 0;					/* (this line is to suppress compiler warning) */
  					dp->sect = 0; return FR_NO_FILE;			/* Report EOT */
  #endif
  				}
  				dp->clust = clst;		/* Initialize data for new cluster */
  				dp->sect = clst2sect(fs, clst);
  			}
  		}
  	}
  	dp->dptr = ofs;						/* Current entry */
  	dp->dir = fs->win + ofs % SS(fs);	/* Pointer to the entry in the win[] */
  
  	return FR_OK;
  }
  
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Directory handling - Reserve a block of directory entries             */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT dir_alloc (	/* FR_OK(0):succeeded, !=0:error */
  	DIR* dp,				/* Pointer to the directory object */
  	UINT n_ent				/* Number of contiguous entries to allocate */
  )
  {
  	FRESULT res;
  	UINT n;
  	FATFS *fs = dp->obj.fs;
  
  
  	res = dir_sdi(dp, 0);
  	if (res == FR_OK) {
  		n = 0;
  		do {
  			res = move_window(fs, dp->sect);
  			if (res != FR_OK) break;
  #if FF_FS_EXFAT
  			if ((fs->fs_type == FS_EXFAT) ? (int)((dp->dir[XDIR_Type] & 0x80) == 0) : (int)(dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0)) {	/* Is the entry free? */
  #else
  			if (dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0) {	/* Is the entry free? */
  #endif
  				if (++n == n_ent) break;	/* Is a block of contiguous free entries found? */
  			} else {
  				n = 0;				/* Not a free entry, restart to search */
  			}
  			res = dir_next(dp, 1);	/* Next entry with table stretch enabled */
  		} while (res == FR_OK);
  	}
  
  	if (res == FR_NO_FILE) res = FR_DENIED;	/* No directory entry to allocate */
  	return res;
  }
  
  #endif	/* !FF_FS_READONLY */
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* FAT: Directory handling - Load/Store start cluster number             */
  /*-----------------------------------------------------------------------*/
  
  static DWORD ld_clust (	/* Returns the top cluster value of the SFN entry */
  	FATFS* fs,			/* Pointer to the fs object */
  	const BYTE* dir		/* Pointer to the key entry */
  )
  {
  	DWORD cl;
  
  	cl = ld_word(dir + DIR_FstClusLO);
  	if (fs->fs_type == FS_FAT32) {
  		cl |= (DWORD)ld_word(dir + DIR_FstClusHI) << 16;
  	}
  
  	return cl;
  }
  
  
  #if !FF_FS_READONLY
  static void st_clust (
  	FATFS* fs,	/* Pointer to the fs object */
  	BYTE* dir,	/* Pointer to the key entry */
  	DWORD cl	/* Value to be set */
  )
  {
  	st_word(dir + DIR_FstClusLO, (WORD)cl);
  	if (fs->fs_type == FS_FAT32) {
  		st_word(dir + DIR_FstClusHI, (WORD)(cl >> 16));
  	}
  }
  #endif
  
  
  
  #if FF_USE_LFN
  /*--------------------------------------------------------*/
  /* FAT-LFN: Compare a part of file name with an LFN entry */
  /*--------------------------------------------------------*/
  
  static int cmp_lfn (		/* 1:matched, 0:not matched */
  	const WCHAR* lfnbuf,	/* Pointer to the LFN working buffer to be compared */
  	BYTE* dir				/* Pointer to the directory entry containing the part of LFN */
  )
  {
  	UINT i, s;
  	WCHAR wc, uc;
  
  
  	if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;	/* Check LDIR_FstClusLO */
  
  	i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;	/* Offset in the LFN buffer */
  
  	for (wc = 1, s = 0; s < 13; s++) {		/* Process all characters in the entry */
  		uc = ld_word(dir + LfnOfs[s]);		/* Pick an LFN character */
  		if (wc != 0) {
  			if (i >= FF_MAX_LFN + 1 || ff_wtoupper(uc) != ff_wtoupper(lfnbuf[i++])) {	/* Compare it */
  				return 0;					/* Not matched */
  			}
  			wc = uc;
  		} else {
  			if (uc != 0xFFFF) return 0;		/* Check filler */
  		}
  	}
  
  	if ((dir[LDIR_Ord] & LLEF) && wc && lfnbuf[i]) return 0;	/* Last segment matched but different length */
  
  	return 1;		/* The part of LFN matched */
  }
  
  
  #if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
  /*-----------------------------------------------------*/
  /* FAT-LFN: Pick a part of file name from an LFN entry */
  /*-----------------------------------------------------*/
  
  static int pick_lfn (	/* 1:succeeded, 0:buffer overflow or invalid LFN entry */
  	WCHAR* lfnbuf,		/* Pointer to the LFN working buffer */
  	BYTE* dir			/* Pointer to the LFN entry */
  )
  {
  	UINT i, s;
  	WCHAR wc, uc;
  
  
  	if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;	/* Check LDIR_FstClusLO is 0 */
  
  	i = ((dir[LDIR_Ord] & ~LLEF) - 1) * 13;	/* Offset in the LFN buffer */
  
  	for (wc = 1, s = 0; s < 13; s++) {		/* Process all characters in the entry */
  		uc = ld_word(dir + LfnOfs[s]);		/* Pick an LFN character */
  		if (wc != 0) {
  			if (i >= FF_MAX_LFN + 1) return 0;	/* Buffer overflow? */
  			lfnbuf[i++] = wc = uc;			/* Store it */
  		} else {
  			if (uc != 0xFFFF) return 0;		/* Check filler */
  		}
  	}
  
  	if (dir[LDIR_Ord] & LLEF && wc != 0) {	/* Put terminator if it is the last LFN part and not terminated */
  		if (i >= FF_MAX_LFN + 1) return 0;	/* Buffer overflow? */
  		lfnbuf[i] = 0;
  	}
  
  	return 1;		/* The part of LFN is valid */
  }
  #endif
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------*/
  /* FAT-LFN: Create an entry of LFN entries */
  /*-----------------------------------------*/
  
  static void put_lfn (
  	const WCHAR* lfn,	/* Pointer to the LFN */
  	BYTE* dir,			/* Pointer to the LFN entry to be created */
  	BYTE ord,			/* LFN order (1-20) */
  	BYTE sum			/* Checksum of the corresponding SFN */
  )
  {
  	UINT i, s;
  	WCHAR wc;
  
  
  	dir[LDIR_Chksum] = sum;			/* Set checksum */
  	dir[LDIR_Attr] = AM_LFN;		/* Set attribute. LFN entry */
  	dir[LDIR_Type] = 0;
  	st_word(dir + LDIR_FstClusLO, 0);
  
  	i = (ord - 1) * 13;				/* Get offset in the LFN working buffer */
  	s = wc = 0;
  	do {
  		if (wc != 0xFFFF) wc = lfn[i++];	/* Get an effective character */
  		st_word(dir + LfnOfs[s], wc);		/* Put it */
  		if (wc == 0) wc = 0xFFFF;			/* Padding characters for following items */
  	} while (++s < 13);
  	if (wc == 0xFFFF || !lfn[i]) ord |= LLEF;	/* Last LFN part is the start of LFN sequence */
  	dir[LDIR_Ord] = ord;			/* Set the LFN order */
  }
  
  #endif	/* !FF_FS_READONLY */
  #endif	/* FF_USE_LFN */
  
  
  
  #if FF_USE_LFN && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* FAT-LFN: Create a Numbered SFN                                        */
  /*-----------------------------------------------------------------------*/
  
  static void gen_numname (
  	BYTE* dst,			/* Pointer to the buffer to store numbered SFN */
  	const BYTE* src,	/* Pointer to SFN in directory form */
  	const WCHAR* lfn,	/* Pointer to LFN */
  	UINT seq			/* Sequence number */
  )
  {
  	BYTE ns[8], c;
  	UINT i, j;
  	WCHAR wc;
  	DWORD sreg;
  
  
  	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 (~ + hexdecimal) */
  	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);
  }
  #endif	/* FF_USE_LFN && !FF_FS_READONLY */
  
  
  
  #if FF_USE_LFN
  /*-----------------------------------------------------------------------*/
  /* FAT-LFN: Calculate checksum of an SFN entry                           */
  /*-----------------------------------------------------------------------*/
  
  static BYTE sum_sfn (
  	const BYTE* dir		/* Pointer to the SFN entry */
  )
  {
  	BYTE sum = 0;
  	UINT n = 11;
  
  	do {
  		sum = (sum >> 1) + (sum << 7) + *dir++;
  	} while (--n);
  	return sum;
  }
  
  #endif	/* FF_USE_LFN */
  
  
  
  #if FF_FS_EXFAT
  /*-----------------------------------------------------------------------*/
  /* exFAT: Checksum                                                       */
  /*-----------------------------------------------------------------------*/
  
  static WORD xdir_sum (	/* Get checksum of the directoly entry block */
  	const BYTE* dir		/* Directory entry block to be calculated */
  )
  {
  	UINT i, szblk;
  	WORD sum;
  
  
  	szblk = (dir[XDIR_NumSec] + 1) * SZDIRE;	/* Number of bytes of the entry block */
  	for (i = sum = 0; i < szblk; i++) {
  		if (i == XDIR_SetSum) {	/* Skip 2-byte sum field */
  			i++;
  		} else {
  			sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + dir[i];
  		}
  	}
  	return sum;
  }
  
  
  
  static WORD xname_sum (	/* Get check sum (to be used as hash) of the file name */
  	const WCHAR* name	/* File name to be calculated */
  )
  {
  	WCHAR chr;
  	WORD sum = 0;
  
  
  	while ((chr = *name++) != 0) {
  		chr = (WCHAR)ff_wtoupper(chr);		/* File name needs to be up-case converted */
  		sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr & 0xFF);
  		sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr >> 8);
  	}
  	return sum;
  }
  
  
  #if !FF_FS_READONLY && FF_USE_MKFS
  static DWORD xsum32 (	/* Returns 32-bit checksum */
  	BYTE  dat,			/* Byte to be calculated (byte-by-byte processing) */
  	DWORD sum			/* Previous sum value */
  )
  {
  	sum = ((sum & 1) ? 0x80000000 : 0) + (sum >> 1) + dat;
  	return sum;
  }
  #endif
  
  
  
  /*-----------------------------------*/
  /* exFAT: Get a directry entry block */
  /*-----------------------------------*/
  
  static FRESULT load_xdir (	/* FR_INT_ERR: invalid entry block */
  	DIR* dp					/* Reading direcotry object pointing top of the entry block to load */
  )
  {
  	FRESULT res;
  	UINT i, sz_ent;
  	BYTE *dirb = dp->obj.fs->dirbuf;	/* Pointer to the on-memory direcotry entry block 85+C0+C1s */
  
  
  	/* Load file directory entry */
  	res = move_window(dp->obj.fs, dp->sect);
  	if (res != FR_OK) return res;
  	if (dp->dir[XDIR_Type] != ET_FILEDIR) return FR_INT_ERR;	/* Invalid order */
  	memcpy(dirb + 0 * SZDIRE, dp->dir, SZDIRE);
  	sz_ent = (dirb[XDIR_NumSec] + 1) * SZDIRE;
  	if (sz_ent < 3 * SZDIRE || sz_ent > 19 * SZDIRE) return FR_INT_ERR;
  
  	/* Load stream extension entry */
  	res = dir_next(dp, 0);
  	if (res == FR_NO_FILE) res = FR_INT_ERR;	/* It cannot be */
  	if (res != FR_OK) return res;
  	res = move_window(dp->obj.fs, dp->sect);
  	if (res != FR_OK) return res;
  	if (dp->dir[XDIR_Type] != ET_STREAM) return FR_INT_ERR;	/* Invalid order */
  	memcpy(dirb + 1 * SZDIRE, dp->dir, SZDIRE);
  	if (MAXDIRB(dirb[XDIR_NumName]) > sz_ent) return FR_INT_ERR;
  
  	/* Load file name entries */
  	i = 2 * SZDIRE;	/* Name offset to load */
  	do {
  		res = dir_next(dp, 0);
  		if (res == FR_NO_FILE) res = FR_INT_ERR;	/* It cannot be */
  		if (res != FR_OK) return res;
  		res = move_window(dp->obj.fs, dp->sect);
  		if (res != FR_OK) return res;
  		if (dp->dir[XDIR_Type] != ET_FILENAME) return FR_INT_ERR;	/* Invalid order */
  		if (i < MAXDIRB(FF_MAX_LFN)) memcpy(dirb + i, dp->dir, SZDIRE);
  	} while ((i += SZDIRE) < sz_ent);
  
  	/* Sanity check (do it for only accessible object) */
  	if (i <= MAXDIRB(FF_MAX_LFN)) {
  		if (xdir_sum(dirb) != ld_word(dirb + XDIR_SetSum)) return FR_INT_ERR;
  	}
  	return FR_OK;
  }
  
  
  /*------------------------------------------------------------------*/
  /* exFAT: Initialize object allocation info with loaded entry block */
  /*------------------------------------------------------------------*/
  
  static void init_alloc_info (
  	FATFS* fs,		/* Filesystem object */
  	FFOBJID* obj	/* Object allocation information to be initialized */
  )
  {
  	obj->sclust = ld_dword(fs->dirbuf + XDIR_FstClus);		/* Start cluster */
  	obj->objsize = ld_qword(fs->dirbuf + XDIR_FileSize);	/* Size */
  	obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;				/* Allocation status */
  	obj->n_frag = 0;										/* No last fragment info */
  }
  
  
  
  #if !FF_FS_READONLY || FF_FS_RPATH != 0
  /*------------------------------------------------*/
  /* exFAT: Load the object's directory entry block */
  /*------------------------------------------------*/
  
  static FRESULT load_obj_xdir (
  	DIR* dp,			/* Blank directory object to be used to access containing direcotry */
  	const FFOBJID* obj	/* Object with its containing directory information */
  )
  {
  	FRESULT res;
  
  	/* Open object containing directory */
  	dp->obj.fs = obj->fs;
  	dp->obj.sclust = obj->c_scl;
  	dp->obj.stat = (BYTE)obj->c_size;
  	dp->obj.objsize = obj->c_size & 0xFFFFFF00;
  	dp->obj.n_frag = 0;
  	dp->blk_ofs = obj->c_ofs;
  
  	res = dir_sdi(dp, dp->blk_ofs);	/* Goto object's entry block */
  	if (res == FR_OK) {
  		res = load_xdir(dp);		/* Load the object's entry block */
  	}
  	return res;
  }
  #endif
  
  
  #if !FF_FS_READONLY
  /*----------------------------------------*/
  /* exFAT: Store the directory entry block */
  /*----------------------------------------*/
  
  static FRESULT store_xdir (
  	DIR* dp				/* Pointer to the direcotry object */
  )
  {
  	FRESULT res;
  	UINT nent;
  	BYTE *dirb = dp->obj.fs->dirbuf;	/* Pointer to the direcotry entry block 85+C0+C1s */
  
  	/* Create set sum */
  	st_word(dirb + XDIR_SetSum, xdir_sum(dirb));
  	nent = dirb[XDIR_NumSec] + 1;
  
  	/* Store the direcotry entry block to the directory */
  	res = dir_sdi(dp, dp->blk_ofs);
  	while (res == FR_OK) {
  		res = move_window(dp->obj.fs, dp->sect);
  		if (res != FR_OK) break;
  		memcpy(dp->dir, dirb, SZDIRE);
  		dp->obj.fs->wflag = 1;
  		if (--nent == 0) break;
  		dirb += SZDIRE;
  		res = dir_next(dp, 0);
  	}
  	return (res == FR_OK || res == FR_DISK_ERR) ? res : FR_INT_ERR;
  }
  
  
  
  /*-------------------------------------------*/
  /* exFAT: Create a new directory enrty block */
  /*-------------------------------------------*/
  
  static void create_xdir (
  	BYTE* dirb,			/* Pointer to the direcotry entry block buffer */
  	const WCHAR* lfn	/* Pointer to the object name */
  )
  {
  	UINT i;
  	BYTE nc1, nlen;
  	WCHAR wc;
  
  
  	/* Create file-directory and stream-extension entry */
  	memset(dirb, 0, 2 * SZDIRE);
  	dirb[0 * SZDIRE + XDIR_Type] = ET_FILEDIR;
  	dirb[1 * SZDIRE + XDIR_Type] = ET_STREAM;
  
  	/* Create file-name entries */
  	i = SZDIRE * 2;	/* Top of file_name entries */
  	nlen = nc1 = 0; wc = 1;
  	do {
  		dirb[i++] = ET_FILENAME; dirb[i++] = 0;
  		do {	/* Fill name field */
  			if (wc != 0 && (wc = lfn[nlen]) != 0) nlen++;	/* Get a character if exist */
  			st_word(dirb + i, wc); 	/* Store it */
  			i += 2;
  		} while (i % SZDIRE != 0);
  		nc1++;
  	} while (lfn[nlen]);	/* Fill next entry if any char follows */
  
  	dirb[XDIR_NumName] = nlen;		/* Set name length */
  	dirb[XDIR_NumSec] = 1 + nc1;	/* Set secondary count (C0 + C1s) */
  	st_word(dirb + XDIR_NameHash, xname_sum(lfn));	/* Set name hash */
  }
  
  #endif	/* !FF_FS_READONLY */
  #endif	/* FF_FS_EXFAT */
  
  
  
  #if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
  /*-----------------------------------------------------------------------*/
  /* Read an object from the directory                                     */
  /*-----------------------------------------------------------------------*/
  
  #define DIR_READ_FILE(dp) dir_read(dp, 0)
  #define DIR_READ_LABEL(dp) dir_read(dp, 1)
  
  static FRESULT dir_read (
  	DIR* dp,		/* Pointer to the directory object */
  	int vol			/* Filtered by 0:file/directory or 1:volume label */
  )
  {
  	FRESULT res = FR_NO_FILE;
  	FATFS *fs = dp->obj.fs;
  	BYTE attr, b;
  #if FF_USE_LFN
  	BYTE ord = 0xFF, sum = 0xFF;
  #endif
  
  	while (dp->sect) {
  		res = move_window(fs, dp->sect);
  		if (res != FR_OK) break;
  		b = dp->dir[DIR_Name];	/* Test for the entry type */
  		if (b == 0) {
  			res = FR_NO_FILE; break; /* Reached to end of the directory */
  		}
  #if FF_FS_EXFAT
  		if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
  			if (FF_USE_LABEL && vol) {
  				if (b == ET_VLABEL) break;	/* Volume label entry? */
  			} else {
  				if (b == ET_FILEDIR) {		/* Start of the file entry block? */
  					dp->blk_ofs = dp->dptr;	/* Get location of the block */
  					res = load_xdir(dp);	/* Load the entry block */
  					if (res == FR_OK) {
  						dp->obj.attr = fs->dirbuf[XDIR_Attr] & AM_MASK;	/* Get attribute */
  					}
  					break;
  				}
  			}
  		} else
  #endif
  		{	/* On the FAT/FAT32 volume */
  			dp->obj.attr = attr = dp->dir[DIR_Attr] & AM_MASK;	/* Get attribute */
  #if FF_USE_LFN		/* LFN configuration */
  			if (b == DDEM || b == '.' || (int)((attr & ~AM_ARC) == AM_VOL) != vol) {	/* An entry without valid data */
  				ord = 0xFF;
  			} else {
  				if (attr == AM_LFN) {	/* An LFN entry is found */
  					if (b & LLEF) {		/* Is it start of an LFN sequence? */
  						sum = dp->dir[LDIR_Chksum];
  						b &= (BYTE)~LLEF; ord = b;
  						dp->blk_ofs = dp->dptr;
  					}
  					/* Check LFN validity and capture it */
  					ord = (b == ord && sum == dp->dir[LDIR_Chksum] && pick_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
  				} else {				/* An SFN entry is found */
  					if (ord != 0 || sum != sum_sfn(dp->dir)) {	/* Is there a valid LFN? */
  						dp->blk_ofs = 0xFFFFFFFF;	/* It has no LFN. */
  					}
  					break;
  				}
  			}
  #else		/* Non LFN configuration */
  			if (b != DDEM && b != '.' && attr != AM_LFN && (int)((attr & ~AM_ARC) == AM_VOL) == vol) {	/* Is it a valid entry? */
  				break;
  			}
  #endif
  		}
  		res = dir_next(dp, 0);		/* Next entry */
  		if (res != FR_OK) break;
  	}
  
  	if (res != FR_OK) dp->sect = 0;		/* Terminate the read operation on error or EOT */
  	return res;
  }
  
  #endif	/* FF_FS_MINIMIZE <= 1 || FF_USE_LABEL || FF_FS_RPATH >= 2 */
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Directory handling - Find an object in the directory                  */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT dir_find (	/* FR_OK(0):succeeded, !=0:error */
  	DIR* dp					/* Pointer to the directory object with the file name */
  )
  {
  	FRESULT res;
  	FATFS *fs = dp->obj.fs;
  	BYTE c;
  #if FF_USE_LFN
  	BYTE a, ord, sum;
  #endif
  
  	if(fs->sclust == 0)
  		res = dir_sdi(dp, 0);			/* Rewind directory object */
  	else
  		res = dir_sdi(dp, dp->dptr);
  	if (res != FR_OK) return res;
  #if FF_FS_EXFAT
  	if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
  		BYTE nc;
  		UINT di, ni;
  		WORD hash = xname_sum(fs->lfnbuf);		/* Hash value of the name to find */
  
  		while ((res = DIR_READ_FILE(dp)) == FR_OK) {	/* Read an item */
  #if FF_MAX_LFN < 255
  			if (fs->dirbuf[XDIR_NumName] > FF_MAX_LFN) continue;		/* Skip comparison if inaccessible object name */
  #endif
  			if (ld_word(fs->dirbuf + XDIR_NameHash) != hash) continue;	/* Skip comparison if hash mismatched */
  			for (nc = fs->dirbuf[XDIR_NumName], di = SZDIRE * 2, ni = 0; nc; nc--, di += 2, ni++) {	/* Compare the name */
  				if ((di % SZDIRE) == 0) di += 2;
  				if (ff_wtoupper(ld_word(fs->dirbuf + di)) != ff_wtoupper(fs->lfnbuf[ni])) break;
  			}
  			if (nc == 0 && !fs->lfnbuf[ni]) break;	/* Name matched? */
  		}
  		return res;
  	}
  #endif
  	/* On the FAT/FAT32 volume */
  #if FF_USE_LFN
  	ord = sum = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
  #endif
  	do {
  		res = move_window(fs, dp->sect);
  		if (res != FR_OK) break;
  		c = dp->dir[DIR_Name];
  		if (c == 0) { res = FR_NO_FILE; break; }	/* Reached to end of table */
  #if FF_USE_LFN		/* LFN configuration */
  		dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;
  		if (c == DDEM || ((a & AM_VOL) && a != AM_LFN)) {	/* An entry without valid data */
  			ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
  		} else {
  			if (a == AM_LFN) {			/* An LFN entry is found */
  				if (!(dp->fn[NSFLAG] & NS_NOLFN)) {
  					if (c & LLEF) {		/* Is it start of LFN sequence? */
  						sum = dp->dir[LDIR_Chksum];
  						c &= (BYTE)~LLEF; ord = c;	/* LFN start order */
  						dp->blk_ofs = dp->dptr;	/* Start offset of LFN */
  					}
  					/* Check validity of the LFN entry and compare it with given name */
  					ord = (c == ord && sum == dp->dir[LDIR_Chksum] && cmp_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
  				}
  			} else {					/* An SFN entry is found */
  				if (ord == 0 && sum == sum_sfn(dp->dir)) break;	/* LFN matched? */
  				if (!(dp->fn[NSFLAG] & NS_LOSS) && !memcmp(dp->dir, dp->fn, 11)) break;	/* SFN matched? */
  				ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF;	/* Reset LFN sequence */
  			}
  		}
  #else		/* Non LFN configuration */
  		dp->obj.attr = dp->dir[DIR_Attr] & AM_MASK;
  		if (!(dp->dir[DIR_Attr] & AM_VOL) && !memcmp(dp->dir, dp->fn, 11)) break;	/* Is it a valid entry? */
  #endif
  		res = dir_next(dp, 0);	/* Next entry */
  	} while (res == FR_OK);
  
  	return res;
  }
  
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Register an object to the directory                                   */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT dir_register (	/* FR_OK:succeeded, FR_DENIED:no free entry or too many SFN collision, FR_DISK_ERR:disk error */
  	DIR* dp						/* Target directory with object name to be created */
  )
  {
  	FRESULT res;
  	FATFS *fs = dp->obj.fs;
  #if FF_USE_LFN		/* LFN configuration */
  	UINT n, len, n_ent;
  	BYTE sn[12], sum;
  
  
  	if (dp->fn[NSFLAG] & (NS_DOT | NS_NONAME)) return FR_INVALID_NAME;	/* Check name validity */
  	for (len = 0; fs->lfnbuf[len]; len++) ;	/* Get lfn length */
  
  #if FF_FS_EXFAT
  	if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
  		n_ent = (len + 14) / 15 + 2;	/* Number of entries to allocate (85+C0+C1s) */
  		res = dir_alloc(dp, n_ent);		/* Allocate directory entries */
  		if (res != FR_OK) return res;
  		dp->blk_ofs = dp->dptr - SZDIRE * (n_ent - 1);	/* Set the allocated entry block offset */
  
  		if (dp->obj.stat & 4) {			/* Has the directory been stretched by new allocation? */
  			dp->obj.stat &= ~4;
  			res = fill_first_frag(&dp->obj);	/* Fill the first fragment on the FAT if needed */
  			if (res != FR_OK) return res;
  			res = fill_last_frag(&dp->obj, dp->clust, 0xFFFFFFFF);	/* Fill the last fragment on the FAT if needed */
  			if (res != FR_OK) return res;
  			if (dp->obj.sclust != 0) {		/* Is it a sub-directory? */
  				DIR dj;
  
  				res = load_obj_xdir(&dj, &dp->obj);	/* Load the object status */
  				if (res != FR_OK) return res;
  				dp->obj.objsize += (DWORD)fs->csize * SS(fs);		/* Increase the directory size by cluster size */
  				st_qword(fs->dirbuf + XDIR_FileSize, dp->obj.objsize);
  				st_qword(fs->dirbuf + XDIR_ValidFileSize, dp->obj.objsize);
  				fs->dirbuf[XDIR_GenFlags] = dp->obj.stat | 1;		/* Update the allocation status */
  				res = store_xdir(&dj);				/* Store the object status */
  				if (res != FR_OK) return res;
  			}
  		}
  
  		create_xdir(fs->dirbuf, fs->lfnbuf);	/* Create on-memory directory block to be written later */
  		return FR_OK;
  	}
  #endif
  	/* On the FAT/FAT32 volume */
  	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 */
  			if(fs->sclust == 0)
  				res = dir_find(dp);				/* Check if the name collides with existing SFN */
  			if (res != FR_OK) break;
  		}
  		if (n == 100) return FR_DENIED;		/* Abort if too many collisions */
  		if (res != FR_NO_FILE) return res;	/* Abort if the result is other than 'not collided' */
  		dp->fn[NSFLAG] = sn[NSFLAG];
  	}
  
  	/* Create an SFN with/without LFNs. */
  	n_ent = (sn[NSFLAG] & NS_LFN) ? (len + 12) / 13 + 1 : 1;	/* Number of entries to allocate */
  	res = dir_alloc(dp, n_ent);		/* Allocate entries */
  	if (res == FR_OK && --n_ent) {	/* Set LFN entry if needed */
  		res = dir_sdi(dp, dp->dptr - n_ent * SZDIRE);
  		if (res == FR_OK) {
  			sum = sum_sfn(dp->fn);	/* Checksum value of the SFN tied to the LFN */
  			do {					/* Store LFN entries in bottom first */
  				res = move_window(fs, dp->sect);
  				if (res != FR_OK) break;
  				put_lfn(fs->lfnbuf, dp->dir, (BYTE)n_ent, sum);
  				fs->wflag = 1;
  				res = dir_next(dp, 0);	/* Next entry */
  			} while (res == FR_OK && --n_ent);
  		}
  	}
  
  #else	/* Non LFN configuration */
  	res = dir_alloc(dp, 1);		/* Allocate an entry for SFN */
  
  #endif
  
  	/* Set SFN entry */
  	if (res == FR_OK) {
  		res = move_window(fs, dp->sect);
  		if (res == FR_OK) {
  			memset(dp->dir, 0, SZDIRE);	/* Clean the entry */
  			memcpy(dp->dir + DIR_Name, dp->fn, 11);	/* Put SFN */
  #if FF_USE_LFN
  			dp->dir[DIR_NTres] = dp->fn[NSFLAG] & (NS_BODY | NS_EXT);	/* Put NT flag */
  #endif
  			fs->wflag = 1;
  		}
  	}
  
  	return res;
  }
  
  #endif /* !FF_FS_READONLY */
  
  
  
  #if !FF_FS_READONLY && FF_FS_MINIMIZE == 0
  /*-----------------------------------------------------------------------*/
  /* Remove an object from the directory                                   */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT dir_remove (	/* FR_OK:Succeeded, FR_DISK_ERR:A disk error */
  	DIR* dp					/* Directory object pointing the entry to be removed */
  )
  {
  	FRESULT res;
  	FATFS *fs = dp->obj.fs;
  #if FF_USE_LFN		/* LFN configuration */
  	DWORD last = dp->dptr;
  
  	res = (dp->blk_ofs == 0xFFFFFFFF) ? FR_OK : dir_sdi(dp, dp->blk_ofs);	/* Goto top of the entry block if LFN is exist */
  	if (res == FR_OK) {
  		do {
  			res = move_window(fs, dp->sect);
  			if (res != FR_OK) break;
  			if (FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
  				dp->dir[XDIR_Type] &= 0x7F;	/* Clear the entry InUse flag. */
  			} else {										/* On the FAT/FAT32 volume */
  				dp->dir[DIR_Name] = DDEM;	/* Mark the entry 'deleted'. */
  			}
  			fs->wflag = 1;
  			if (dp->dptr >= last) break;	/* If reached last entry then all entries of the object has been deleted. */
  			res = dir_next(dp, 0);	/* Next entry */
  		} while (res == FR_OK);
  		if (res == FR_NO_FILE) res = FR_INT_ERR;
  	}
  #else			/* Non LFN configuration */
  
  	res = move_window(fs, dp->sect);
  	if (res == FR_OK) {
  		dp->dir[DIR_Name] = DDEM;	/* Mark the entry 'deleted'.*/
  		fs->wflag = 1;
  	}
  #endif
  
  	return res;
  }
  
  #endif /* !FF_FS_READONLY && FF_FS_MINIMIZE == 0 */
  
  
  
  #if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2
  /*-----------------------------------------------------------------------*/
  /* Get file information from directory entry                             */
  /*-----------------------------------------------------------------------*/
  
  static void get_fileinfo (
  	DIR* dp,			/* Pointer to the directory object */
  	FILINFO* fno		/* Pointer to the file information to be filled */
  )
  {
  	UINT si, di;
  #if FF_USE_LFN
  	BYTE lcf;
  	WCHAR wc, hs;
  	FATFS *fs = dp->obj.fs;
  	UINT nw;
  #else
  	TCHAR c;
  #endif
  
  
  	fno->fname[0] = 0;			/* Invaidate file info */
  	if (dp->sect == 0) return;	/* Exit if read pointer has reached end of directory */
  
  #if FF_USE_LFN		/* LFN configuration */
  #if FF_FS_EXFAT
  	if (fs->fs_type == FS_EXFAT) {	/* exFAT volume */
  		UINT nc = 0;
  
  		si = SZDIRE * 2; di = 0;	/* 1st C1 entry in the entry block */
  		hs = 0;
  		while (nc < fs->dirbuf[XDIR_NumName]) {
  			if (si >= MAXDIRB(FF_MAX_LFN)) { di = 0; break; }	/* Truncated directory block? */
  			if ((si % SZDIRE) == 0) si += 2;		/* Skip entry type field */
  			wc = ld_word(fs->dirbuf + si); si += 2; nc++;	/* Get a character */
  			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) { di = 0; break; }			/* Buffer overflow or wrong char? */
  			di += nw;
  			hs = 0;
  		}
  		if (hs != 0) di = 0;					/* Broken surrogate pair? */
  		if (di == 0) fno->fname[di++] = '?';	/* Inaccessible object name? */
  		fno->fname[di] = 0;						/* Terminate the name */
  		fno->altname[0] = 0;					/* exFAT does not support SFN */
  
  		fno->fattrib = fs->dirbuf[XDIR_Attr] & AM_MASKX;		/* Attribute */
  		fno->fsize = (fno->fattrib & AM_DIR) ? 0 : ld_qword(fs->dirbuf + XDIR_FileSize);	/* Size */
  		fno->ftime = ld_word(fs->dirbuf + XDIR_ModTime + 0);	/* Time */
  		fno->fdate = ld_word(fs->dirbuf + XDIR_ModTime + 2);	/* Date */
  		return;
  	} else
  #endif
  	{	/* 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) { di = 0; break; }	/* Buffer overflow or wrong char? */
  				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 FF_LFN_UNICODE >= 1	/* Unicode output */
  		if (dbc_1st((BYTE)wc) && si != 8 && si != 11 && dbc_2nd(dp->dir[si])) {	/* Make a DBC if needed */
  			wc = wc << 8 | dp->dir[si++];
  		}
  		wc = ff_oem2uni(wc, CODEPAGE);		/* ANSI/OEM -> Unicode */
  		if (wc == 0) { di = 0; break; }		/* Wrong char in the current code page? */
  		nw = put_utf(wc, &fno->altname[di], FF_SFN_BUF - di);	/* Store it in API encoding */
  		if (nw == 0) { di = 0; break; }		/* Buffer overflow? */
  		di += nw;
  #else					/* ANSI/OEM output */
  		fno->altname[di++] = (TCHAR)wc;	/* Store it without any conversion */
  #endif
  	}
  	fno->altname[di] = 0;	/* Terminate the SFN  (null string means SFN is invalid) */
  
  	if (fno->fname[0] == 0) {	/* If LFN is invalid, altname[] needs to be copied to fname[] */
  		if (di == 0) {	/* If LFN and SFN both are invalid, this object is inaccesible */
  			fno->fname[di++] = '?';
  		} else {
  			for (si = di = 0, lcf = NS_BODY; fno->altname[si]; si++, di++) {	/* Copy altname[] to fname[] with case information */
  				wc = (WCHAR)fno->altname[si];
  				if (wc == '.') lcf = NS_EXT;
  				if (IsUpper(wc) && (dp->dir[DIR_NTres] & lcf)) wc += 0x20;
  				fno->fname[di] = (TCHAR)wc;
  			}
  		}
  		fno->fname[di] = 0;	/* Terminate the LFN */
  		if (!dp->dir[DIR_NTres]) fno->altname[0] = 0;	/* Altname is not needed if neither LFN nor case info is exist. */
  	}
  
  #else	/* Non-LFN configuration */
  	si = di = 0;
  	while (si < 11) {		/* Copy name body and extension */
  		c = (TCHAR)dp->dir[si++];
  		if (c == ' ') continue;		/* Skip padding spaces */
  		if (c == RDDEM) c = DDEM;	/* Restore replaced DDEM character */
  		if (si == 9) fno->fname[di++] = '.';/* Insert a . if extension is exist */
  		fno->fname[di++] = c;
  	}
  	fno->fname[di] = 0;		/* Terminate the SFN */
  #endif
  
  	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 */
  }
  
  #endif /* FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 */
  
  
  
  #if FF_USE_FIND && FF_FS_MINIMIZE <= 1
  /*-----------------------------------------------------------------------*/
  /* Pattern matching                                                      */
  /*-----------------------------------------------------------------------*/
  
  #define FIND_RECURS	4	/* Maximum number of wildcard terms in the pattern to limit recursion */
  
  
  static DWORD get_achar (	/* Get a character and advance ptr */
  	const TCHAR** ptr		/* Pointer to pointer to the ANSI/OEM or Unicode string */
  )
  {
  	DWORD chr;
  
  
  #if FF_USE_LFN && FF_LFN_UNICODE >= 1	/* Unicode input */
  	chr = tchar2uni(ptr);
  	if (chr == 0xFFFFFFFF) chr = 0;		/* Wrong UTF encoding is recognized as end of the string */
  	chr = ff_wtoupper(chr);
  
  #else									/* ANSI/OEM input */
  	chr = (BYTE)*(*ptr)++;				/* Get a byte */
  	if (IsLower(chr)) chr -= 0x20;		/* To upper ASCII char */
  #if FF_CODE_PAGE == 0
  	if (ExCvt && chr >= 0x80) chr = ExCvt[chr - 0x80];	/* To upper SBCS extended char */
  #elif FF_CODE_PAGE < 900
  	if (chr >= 0x80) chr = ExCvt[chr - 0x80];	/* To upper SBCS extended char */
  #endif
  #if FF_CODE_PAGE == 0 || FF_CODE_PAGE >= 900
  	if (dbc_1st((BYTE)chr)) {	/* Get DBC 2nd byte if needed */
  		chr = dbc_2nd((BYTE)**ptr) ? chr << 8 | (BYTE)*(*ptr)++ : 0;
  	}
  #endif
  
  #endif
  	return chr;
  }
  
  
  static int pattern_match (	/* 0:mismatched, 1:matched */
  	const TCHAR* pat,	/* Matching pattern */
  	const TCHAR* nam,	/* String to be tested */
  	UINT skip,			/* Number of pre-skip chars (number of ?s, b8:infinite (* specified)) */
  	UINT recur			/* Recursion count */
  )
  {
  	const TCHAR *pptr, *nptr;
  	DWORD pchr, nchr;
  	UINT sk;
  
  
  	while ((skip & 0xFF) != 0) {		/* Pre-skip name chars */
  		if (!get_achar(&nam)) return 0;	/* Branch mismatched if less name chars */
  		skip--;
  	}
  	if (*pat == 0 && skip) return 1;	/* Matched? (short circuit) */
  
  	do {
  		pptr = pat; nptr = nam;			/* Top of pattern and name to match */
  		for (;;) {
  			if (*pptr == '?' || *pptr == '*') {	/* Wildcard term? */
  				if (recur == 0) return 0;	/* Too many wildcard terms? */
  				sk = 0;
  				do {	/* Analyze the wildcard term */
  					if (*pptr++ == '?') sk++; else sk |= 0x100;
  				} while (*pptr == '?' || *pptr == '*');
  				if (pattern_match(pptr, nptr, sk, recur - 1)) return 1;	/* Test new branch (recursive call) */
  				nchr = *nptr; break;	/* Branch mismatched */
  			}
  			pchr = get_achar(&pptr);	/* Get a pattern char */
  			nchr = get_achar(&nptr);	/* Get a name char */
  			if (pchr != nchr) break;	/* Branch mismatched? */
  			if (pchr == 0) return 1;	/* Branch matched? (matched at end of both strings) */
  		}
  		get_achar(&nam);			/* nam++ */
  	} while (skip && nchr);		/* Retry until end of name if infinite search is specified */
  
  	return 0;
  }
  
  #endif /* FF_USE_FIND && FF_FS_MINIMIZE <= 1 */
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Pick a top segment and create the object name in directory form       */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT create_name (	/* FR_OK: successful, FR_INVALID_NAME: could not create */
  	DIR* dp,					/* Pointer to the directory object */
  	const TCHAR** path			/* Pointer to pointer to the segment in the path string */
  )
  {
  #if FF_USE_LFN		/* LFN configuration */
  	BYTE b, cf;
  	WCHAR wc, *lfn;
  	DWORD uc;
  	UINT i, ni, si, di;
  	const TCHAR *p;
  
  
  	/* Create LFN into LFN working buffer */
  	p = *path; lfn = dp->obj.fs->lfnbuf; di = 0;
  	for (;;) {
  		uc = tchar2uni(&p);			/* Get a character */
  		if (uc == 0xFFFFFFFF) return FR_INVALID_NAME;		/* Invalid code or UTF decode error */
  		if (uc >= 0x10000) lfn[di++] = (WCHAR)(uc >> 16);	/* Store high surrogate if needed */
  		wc = (WCHAR)uc;
  		if (wc < ' ' || 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 */
  
  #if FF_FS_RPATH != 0
  	if ((di == 1 && lfn[di - 1] == '.') ||
  		(di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) {	/* Is this segment a dot name? */
  		lfn[di] = 0;
  		for (i = 0; i < 11; i++) {	/* Create dot name for SFN entry */
  			dp->fn[i] = (i < di) ? '.' : ' ';
  		}
  		dp->fn[i] = cf | NS_DOT;	/* This is a dot entry */
  		return FR_OK;
  	}
  #endif
  	while (di) {					/* Snip off trailing spaces and dots if exist */
  		wc = lfn[di - 1];
  		if (wc != ' ' && wc != '.') break;
  		di--;
  	}
  	lfn[di] = 0;							/* LFN is created into the working buffer */
  	if (di == 0) return FR_INVALID_NAME;	/* Reject null name */
  
  	/* Create SFN in directory form */
  	for (si = 0; lfn[si] == ' '; si++) ;	/* Remove leading spaces */
  	if (si > 0 || lfn[si] == '.') cf |= NS_LOSS | NS_LFN;	/* Is there any leading space or dot? */
  	while (di > 0 && lfn[di - 1] != '.') di--;	/* Find last dot (di<=si: no extension) */
  
  	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 */
  #if FF_CODE_PAGE == 0
  			if (ExCvt) {	/* In SBCS cfg */
  				wc = ff_uni2oem(wc, CODEPAGE);			/* Unicode ==> ANSI/OEM code */
  				if (wc & 0x80) wc = ExCvt[wc & 0x7F];	/* Convert extended character to upper (SBCS) */
  			} else {		/* In DBCS cfg */
  				wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE);	/* Unicode ==> Up-convert ==> ANSI/OEM code */
  			}
  #elif FF_CODE_PAGE < 900	/* In SBCS cfg */
  			wc = ff_uni2oem(wc, CODEPAGE);			/* Unicode ==> ANSI/OEM code */
  			if (wc & 0x80) wc = ExCvt[wc & 0x7F];	/* Convert extended character to upper (SBCS) */
  #else						/* In DBCS cfg */
  			wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE);	/* Unicode ==> Up-convert ==> ANSI/OEM code */
  #endif
  		}
  
  		if (wc >= 0x100) {				/* Is this a DBC? */
  			if (i >= ni - 1) {			/* Field overflow? */
  				cf |= NS_LOSS | NS_LFN;
  				i = ni; continue;		/* Next field */
  			}
  			dp->fn[i++] = (BYTE)(wc >> 8);	/* Put 1st byte */
  		} else {						/* SBC */
  			if (wc == 0 || 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;
  
  
  #else	/* FF_USE_LFN : Non-LFN configuration */
  	BYTE c, d, *sfn;
  	UINT ni, si, i;
  	const char *p;
  
  	/* Create file name in directory form */
  	p = *path; sfn = dp->fn;
  	memset(sfn, ' ', 11);
  	si = i = 0; ni = 8;
  #if FF_FS_RPATH != 0
  	if (p[si] == '.') { /* Is this a dot entry? */
  		for (;;) {
  			c = (BYTE)p[si++];
  			if (c != '.' || si >= 3) break;
  			sfn[i++] = c;
  		}
  		if (!IsSeparator(c) && c > ' ') return FR_INVALID_NAME;
  		*path = p + si;					/* Return pointer to the next segment */
  		sfn[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;	/* Set last segment flag if end of the path */
  		return FR_OK;
  	}
  #endif
  	for (;;) {
  		c = (BYTE)p[si++];				/* Get a byte */
  		if (c <= ' ') break; 			/* Break if end of the path name */
  		if (IsSeparator(c)) {			/* Break if a separator is found */
  			while (IsSeparator(p[si])) si++;	/* Skip duplicated separator if exist */
  			break;
  		}
  		if (c == '.' || i >= ni) {		/* End of body or field overflow? */
  			if (ni == 11 || c != '.') return FR_INVALID_NAME;	/* Field overflow or invalid dot? */
  			i = 8; ni = 11;				/* Enter file extension field */
  			continue;
  		}
  #if FF_CODE_PAGE == 0
  		if (ExCvt && c >= 0x80) {		/* Is SBC extended character? */
  			c = ExCvt[c & 0x7F];		/* To upper SBC extended character */
  		}
  #elif FF_CODE_PAGE < 900
  		if (c >= 0x80) {				/* Is SBC extended character? */
  			c = ExCvt[c & 0x7F];		/* To upper SBC extended character */
  		}
  #endif
  		if (dbc_1st(c)) {				/* Check if it is a DBC 1st byte */
  			d = (BYTE)p[si++];			/* Get 2nd byte */
  			if (!dbc_2nd(d) || i >= ni - 1) return FR_INVALID_NAME;	/* Reject invalid DBC */
  			sfn[i++] = c;
  			sfn[i++] = d;
  		} else {						/* SBC */
  			if (strchr("*+,:;<=>[]|\"\?\x7F", (int)c)) return FR_INVALID_NAME;	/* Reject illegal chrs for SFN */
  			if (IsLower(c)) c -= 0x20;	/* To upper */
  			sfn[i++] = c;
  		}
  	}
  	*path = &p[si];						/* Return pointer to the next segment */
  	if (i == 0) return FR_INVALID_NAME;	/* Reject nul string */
  
  	if (sfn[0] == DDEM) sfn[0] = RDDEM;	/* If the first character collides with DDEM, replace it with RDDEM */
  	sfn[NSFLAG] = (c <= ' ' || p[si] <= ' ') ? NS_LAST : 0;	/* Set last segment flag if end of the path */
  
  	return FR_OK;
  #endif /* FF_USE_LFN */
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Follow a file path                                                    */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT follow_path (	/* FR_OK(0): successful, !=0: error code */
  	DIR* dp,					/* Directory object to return last directory and found object */
  	const TCHAR* path			/* Full-path string to find a file or directory */
  )
  {
  	FRESULT res;
  	BYTE ns;
  	FATFS *fs = dp->obj.fs;
  
  
  #if FF_FS_RPATH != 0
  	if (!IsSeparator(*path) && (FF_STR_VOLUME_ID != 2 || !IsTerminator(*path))) {	/* Without heading separator */
  		dp->obj.sclust = fs->cdir;			/* Start at the current directory */
  	} else
  #endif
  	if(fs->sclust){
  		while (IsSeparator(*path)) path++;	/* Strip separators */
  		dp->obj.sclust = fs->sclust;
  	} else
  	{										/* With heading separator */
  		while (IsSeparator(*path)) path++;	/* Strip separators */
  		dp->obj.sclust = 0;					/* Start from the root directory */
  	}
  #if FF_FS_EXFAT
  	dp->obj.n_frag = 0;	/* Invalidate last fragment counter of the object */
  #if FF_FS_RPATH != 0
  	if (fs->fs_type == FS_EXFAT && dp->obj.sclust) {	/* exFAT: Retrieve the sub-directory's status */
  		DIR dj;
  
  		dp->obj.c_scl = fs->cdc_scl;
  		dp->obj.c_size = fs->cdc_size;
  		dp->obj.c_ofs = fs->cdc_ofs;
  		res = load_obj_xdir(&dj, &dp->obj);
  		if (res != FR_OK) return res;
  		dp->obj.objsize = ld_dword(fs->dirbuf + XDIR_FileSize);
  		dp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
  	}
  #endif
  #endif
  
  	if ((UINT)*path < ' ') {				/* Null path name is the origin directory itself */
  		dp->fn[NSFLAG] = NS_NONAME;
  		res = dir_sdi(dp, 0);
  
  	} else {								/* Follow path */
  		for (;;) {
  			res = create_name(dp, &path);	/* Get a segment name of the path */
  			if (res != FR_OK) break;
  			res = dir_find(dp);				/* Find an object with the segment name */
  			ns = dp->fn[NSFLAG];
  			if (res != FR_OK) {				/* Failed to find the object */
  				if (res == FR_NO_FILE) {	/* Object is not found */
  					if (FF_FS_RPATH && (ns & NS_DOT)) {	/* If dot entry is not exist, stay there */
  						if (!(ns & NS_LAST)) continue;	/* Continue to follow if not last segment */
  						dp->fn[NSFLAG] = NS_NONAME;
  						res = FR_OK;
  					} else {							/* Could not find the object */
  						if (!(ns & NS_LAST)) res = FR_NO_PATH;	/* Adjust error code if not last segment */
  					}
  				}
  				break;
  			}
  			if (ns & NS_LAST) break;		/* Last segment matched. Function completed. */
  			/* Get into the sub-directory */
  			if (!(dp->obj.attr & AM_DIR)) {	/* It is not a sub-directory and cannot follow */
  				res = FR_NO_PATH; break;
  			}
  #if FF_FS_EXFAT
  			if (fs->fs_type == FS_EXFAT) {	/* Save containing directory information for next dir */
  				dp->obj.c_scl = dp->obj.sclust;
  				dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
  				dp->obj.c_ofs = dp->blk_ofs;
  				init_alloc_info(fs, &dp->obj);	/* Open next directory */
  			} else
  #endif
  			{
  				dp->obj.sclust = ld_clust(fs, fs->win + dp->dptr % SS(fs));	/* Open next directory */
  			}
  		}
  	}
  
  	return res;
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Get logical drive number from path name                               */
  /*-----------------------------------------------------------------------*/
  
  static int get_ldnumber (	/* Returns logical drive number (-1:invalid drive number or null pointer) */
  	const TCHAR** path		/* Pointer to pointer to the path name */
  )
  {
  	const TCHAR *tp, *tt;
  	TCHAR tc;
  	int i;
  	int vol = -1;
  #if FF_STR_VOLUME_ID		/* Find string volume ID */
  	const char *sp;
  	char c;
  #endif
  
  	tt = tp = *path;
  	if (!tp) return vol;	/* Invalid path name? */
  	do tc = *tt++; while (!IsTerminator(tc) && tc != ':');	/* Find a colon in the path */
  
  	if (tc == ':') {	/* DOS/Windows style volume ID? */
  		i = FF_VOLUMES;
  		if (IsDigit(*tp) && tp + 2 == tt) {	/* Is there a numeric volume ID + colon? */
  			i = (int)*tp - '0';	/* Get the LD number */
  		}
  #if FF_STR_VOLUME_ID == 1	/* Arbitrary string is enabled */
  		else {
  			i = 0;
  			do {
  				sp = VolumeStr[i]; tp = *path;	/* This string volume ID and path name */
  				do {	/* Compare the volume ID with path name */
  					c = *sp++; tc = *tp++;
  					if (IsLower(c)) c -= 0x20;
  					if (IsLower(tc)) tc -= 0x20;
  				} while (c && (TCHAR)c == tc);
  			} while ((c || tp != tt) && ++i < FF_VOLUMES);	/* Repeat for each id until pattern match */
  		}
  #endif
  		if (i < FF_VOLUMES) {	/* If a volume ID is found, get the drive number and strip it */
  			vol = i;		/* Drive number */
  			*path = tt;		/* Snip the drive prefix off */
  		}
  		return vol;
  	}
  #if FF_STR_VOLUME_ID == 2		/* Unix style volume ID is enabled */
  	if (*tp == '/') {			/* Is there a volume ID? */
  		while (*(tp + 1) == '/') tp++;	/* Skip duplicated separator */
  		i = 0;
  		do {
  			tt = tp; sp = VolumeStr[i]; /* Path name and this string volume ID */
  			do {	/* Compare the volume ID with path name */
  				c = *sp++; tc = *(++tt);
  				if (IsLower(c)) c -= 0x20;
  				if (IsLower(tc)) tc -= 0x20;
  			} while (c && (TCHAR)c == tc);
  		} while ((c || (tc != '/' && !IsTerminator(tc))) && ++i < FF_VOLUMES);	/* Repeat for each ID until pattern match */
  		if (i < FF_VOLUMES) {	/* If a volume ID is found, get the drive number and strip it */
  			vol = i;		/* Drive number */
  			*path = tt;		/* Snip the drive prefix off */
  		}
  		return vol;
  	}
  #endif
  	/* No drive prefix is found */
  #if FF_FS_RPATH != 0
  	vol = CurrVol;	/* Default drive is current drive */
  #else
  	vol = 0;		/* Default drive is 0 */
  #endif
  	return vol;		/* Return the default drive */
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* GPT support functions                                                 */
  /*-----------------------------------------------------------------------*/
  
  #if FF_LBA64
  
  /* Calculate CRC32 in byte-by-byte */
  
  static DWORD crc32 (	/* Returns next CRC value */
  	DWORD crc,			/* Current CRC value */
  	BYTE d				/* A byte to be processed */
  )
  {
  	BYTE b;
  
  
  	for (b = 1; b; b <<= 1) {
  		crc ^= (d & b) ? 1 : 0;
  		crc = (crc & 1) ? crc >> 1 ^ 0xEDB88320 : crc >> 1;
  	}
  	return crc;
  }
  
  
  /* Check validity of GPT header */
  
  static int test_gpt_header (	/* 0:Invalid, 1:Valid */
  	const BYTE* gpth			/* Pointer to the GPT header */
  )
  {
  	UINT i;
  	DWORD bcc;
  
  
  	if (memcmp(gpth + GPTH_Sign, "EFI PART" "\0\0\1\0" "\x5C\0\0", 16)) return 0;	/* Check sign, version (1.0) and length (92) */
  	for (i = 0, bcc = 0xFFFFFFFF; i < 92; i++) {		/* Check header BCC */
  		bcc = crc32(bcc, i - GPTH_Bcc < 4 ? 0 : gpth[i]);
  	}
  	if (~bcc != ld_dword(gpth + GPTH_Bcc)) return 0;
  	if (ld_dword(gpth + GPTH_PteSize) != SZ_GPTE) return 0;	/* Table entry size (must be SZ_GPTE bytes) */
  	if (ld_dword(gpth + GPTH_PtNum) > 128) return 0;	/* Table size (must be 128 entries or less) */
  
  	return 1;
  }
  
  #if !FF_FS_READONLY && FF_USE_MKFS
  
  /* Generate random value */
  static DWORD make_rand (
  	DWORD seed,		/* Seed value */
  	BYTE* buff,		/* Output buffer */
  	UINT n			/* Data length */
  )
  {
  	UINT r;
  
  
  	if (seed == 0) seed = 1;
  	do {
  		for (r = 0; r < 8; r++) seed = seed & 1 ? seed >> 1 ^ 0xA3000000 : seed >> 1;	/* Shift 8 bits the 32-bit LFSR */
  		*buff++ = (BYTE)seed;
  	} while (--n);
  	return seed;
  }
  
  #endif
  #endif
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Load a sector and check if it is an FAT VBR                           */
  /*-----------------------------------------------------------------------*/
  
  /* Check what the sector is */
  
  static UINT check_fs (	/* 0:FAT/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, sign;
  	BYTE b;
  
  
  	fs->wflag = 0; fs->winsect = (LBA_t)0 - 1;		/* Invaidate window */
  	if (move_window(fs, sect) != FR_OK) return 4;	/* Load the boot sector */
  	sign = ld_word(fs->win + BS_55AA);
  #if FF_FS_EXFAT
  	if (sign == 0xAA55 && !memcmp(fs->win + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11)) return 1;	/* It is an exFAT VBR */
  #endif
  	b = fs->win[BS_JmpBoot];
  	if (b == 0xEB || b == 0xE9 || b == 0xE8) {	/* Valid JumpBoot code? (short jump, near jump or near call) */
  		if (sign == 0xAA55 && !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:auto, 1..:forced */
  )
  {
  	UINT fmt, i;
  	DWORD mbr_pt[4];
  
  
  	fmt = check_fs(fs, 0);				/* Load sector 0 and check if it is an FAT VBR as SFD 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_LBA64
  	if (fs->win[MBR_Table + PTE_System] == 0xEE) {	/* GPT protective MBR? */
  		DWORD n_ent, v_ent, ofs;
  		QWORD pt_lba;
  
  		if (move_window(fs, 1) != FR_OK) return 4;	/* Load GPT header sector (next to MBR) */
  		if (!test_gpt_header(fs->win)) return 3;	/* Check if GPT header is valid */
  		n_ent = ld_dword(fs->win + GPTH_PtNum);		/* Number of entries */
  		pt_lba = ld_qword(fs->win + GPTH_PtOfs);	/* Table location */
  		for (v_ent = i = 0; i < n_ent; i++) {		/* Find FAT partition */
  			if (move_window(fs, pt_lba + i * SZ_GPTE / SS(fs)) != FR_OK) return 4;	/* PT sector */
  			ofs = i * SZ_GPTE % SS(fs);												/* Offset in the sector */
  			if (!memcmp(fs->win + ofs + GPTE_PtGuid, GUID_MS_Basic, 16)) {	/* MS basic data partition? */
  				v_ent++;
  				fmt = check_fs(fs, ld_qword(fs->win + ofs + GPTE_FstLba));	/* Load VBR and check status */
  				if (part == 0 && fmt <= 1) return fmt;			/* Auto search (valid FAT volume found first) */
  				if (part != 0 && v_ent == part) return fmt;		/* Forced partition order (regardless of it is valid or not) */
  			}
  		}
  		return 3;	/* Not found */
  	}
  #endif
  	if (FF_MULTI_PARTITION && part > 4) return 3;	/* MBR has 4 partitions max */
  	for (i = 0; i < 4; i++) {		/* Load partition offset in the MBR */
  		mbr_pt[i] = ld_dword(fs->win + MBR_Table + i * SZ_PTE + PTE_StLba);
  	}
  	i = part ? part - 1 : 0;		/* Table index to find first */
  	do {							/* Find an FAT volume */
  		fmt = mbr_pt[i] ? check_fs(fs, mbr_pt[i]) : 3;	/* Check if the partition is FAT */
  	} while (part == 0 && fmt >= 2 && ++i < 4);
  	return fmt;
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Determine logical drive number and mount the volume if needed         */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT mount_volume (	/* FR_OK(0): successful, !=0: an error occurred */
  	const TCHAR** path,			/* Pointer to pointer to the path name (drive number) */
  	FATFS** rfs,				/* Pointer to pointer to the found filesystem object */
  	BYTE mode					/* !=0: Check write protection for write access */
  )
  {
  	int vol;
  	DSTATUS stat;
  	LBA_t bsect;
  	DWORD tsect, sysect, fasize, nclst, szbfat;
  	WORD nrsv;
  	FATFS *fs;
  	UINT fmt;
  
  
  	/* Get logical drive number */
  	*rfs = 0;
  	vol = get_ldnumber(path);
  	if (vol < 0) return FR_INVALID_DRIVE;
  
  	/* Check if the filesystem object is valid or not */
  	fs = FatFs[vol];					/* Get pointer to the filesystem object */
  	if (!fs) return FR_NOT_ENABLED;		/* Is the filesystem object available? */
  #if FF_FS_REENTRANT
  	if (!lock_fs(fs)) return FR_TIMEOUT;	/* Lock the volume */
  #endif
  	*rfs = fs;							/* Return pointer to the filesystem object */
  
  	mode &= (BYTE)~FA_READ;				/* Desired access mode, write access or not */
  	if (fs->fs_type != 0) {				/* If the volume has been mounted */
  		stat = disk_status(fs->pdrv);
  		if (!(stat & STA_NOINIT)) {		/* and the physical drive is kept initialized */
  			if (!FF_FS_READONLY && mode && (stat & STA_PROTECT)) {	/* Check write protection if needed */
  				return FR_WRITE_PROTECTED;
  			}
  			return FR_OK;				/* The filesystem object is already valid */
  		}
  	}
  
  	/* The filesystem object is not valid. */
  	/* Following code attempts to mount the volume. (find an FAT volume, analyze the BPB and initialize the filesystem object) */
  
  	fs->fs_type = 0;					/* Clear the filesystem object */
  	fs->pdrv = LD2PD(vol);				/* Volume hosting physical drive */
  	stat = disk_initialize(fs->pdrv);	/* Initialize the physical drive */
  	if (stat & STA_NOINIT) { 			/* Check if the initialization succeeded */
  		return FR_NOT_READY;			/* Failed to initialize due to no medium or hard error */
  	}
  	if (!FF_FS_READONLY && mode && (stat & STA_PROTECT)) { /* Check disk write protection if needed */
  		return FR_WRITE_PROTECTED;
  	}
  #if FF_MAX_SS != FF_MIN_SS				/* Get sector size (multiple sector size cfg only) */
  	if (disk_ioctl(fs->pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK) return FR_DISK_ERR;
  	if (SS(fs) > FF_MAX_SS || SS(fs) < FF_MIN_SS || (SS(fs) & (SS(fs) - 1))) return FR_DISK_ERR;
  #endif
  
  	/* Find an FAT volume on the drive */
  	fmt = find_volume(fs, LD2PT(vol));
  	if (fmt == 4) return FR_DISK_ERR;		/* An error occured in the disk I/O layer */
  	if (fmt >= 2) return FR_NO_FILESYSTEM;	/* No FAT volume is found */
  	bsect = fs->winsect;					/* Volume offset */
  
  	/* An FAT volume is found (bsect). Following code initializes the filesystem object */
  
  #if FF_FS_EXFAT
  	if (fmt == 1) {
  		QWORD maxlba;
  		DWORD so, cv, bcl, i;
  
  		for (i = BPB_ZeroedEx; i < BPB_ZeroedEx + 53 && fs->win[i] == 0; i++) ;	/* Check zero filler */
  		if (i < BPB_ZeroedEx + 53) return FR_NO_FILESYSTEM;
  
  		if (ld_word(fs->win + BPB_FSVerEx) != 0x100) return FR_NO_FILESYSTEM;	/* Check exFAT version (must be version 1.0) */
  
  		if (1 << fs->win[BPB_BytsPerSecEx] != SS(fs)) {	/* (BPB_BytsPerSecEx must be equal to the physical sector size) */
  			return FR_NO_FILESYSTEM;
  		}
  
  		maxlba = ld_qword(fs->win + BPB_TotSecEx) + bsect;	/* Last LBA of the volume + 1 */
  		if (!FF_LBA64 && maxlba >= 0x100000000) return FR_NO_FILESYSTEM;	/* (It cannot be accessed in 32-bit LBA) */
  
  		fs->fsize = ld_dword(fs->win + BPB_FatSzEx);	/* Number of sectors per FAT */
  
  		fs->n_fats = fs->win[BPB_NumFATsEx];			/* Number of FATs */
  		if (fs->n_fats != 1) return FR_NO_FILESYSTEM;	/* (Supports only 1 FAT) */
  
  		fs->csize = 1 << fs->win[BPB_SecPerClusEx];		/* Cluster size */
  		if (fs->csize == 0)	return FR_NO_FILESYSTEM;	/* (Must be 1..32768 sectors) */
  
  		nclst = ld_dword(fs->win + BPB_NumClusEx);		/* Number of clusters */
  		if (nclst > MAX_EXFAT) return FR_NO_FILESYSTEM;	/* (Too many clusters) */
  		fs->n_fatent = nclst + 2;
  
  		/* Boundaries and Limits */
  		fs->volbase = bsect;
  		fs->database = bsect + ld_dword(fs->win + BPB_DataOfsEx);
  		fs->fatbase = bsect + ld_dword(fs->win + BPB_FatOfsEx);
  		if (maxlba < (QWORD)fs->database + nclst * fs->csize) return FR_NO_FILESYSTEM;	/* (Volume size must not be smaller than the size requiered) */
  		fs->dirbase = ld_dword(fs->win + BPB_RootClusEx);
  
  		/* Get bitmap location and check if it is contiguous (implementation assumption) */
  		so = i = 0;
  		for (;;) {	/* Find the bitmap entry in the root directory (in only first cluster) */
  			if (i == 0) {
  				if (so >= fs->csize) return FR_NO_FILESYSTEM;	/* Not found? */
  				if (move_window(fs, clst2sect(fs, (DWORD)fs->dirbase) + so) != FR_OK) return FR_DISK_ERR;
  				so++;
  			}
  			if (fs->win[i] == ET_BITMAP) break;			/* Is it a bitmap entry? */
  			i = (i + SZDIRE) % SS(fs);	/* Next entry */
  		}
  		bcl = ld_dword(fs->win + i + 20);				/* Bitmap cluster */
  		if (bcl < 2 || bcl >= fs->n_fatent) return FR_NO_FILESYSTEM;	/* (Wrong cluster#) */
  		fs->bitbase = fs->database + fs->csize * (bcl - 2);	/* Bitmap sector */
  		for (;;) {	/* Check if bitmap is contiguous */
  			if (move_window(fs, fs->fatbase + bcl / (SS(fs) / 4)) != FR_OK) return FR_DISK_ERR;
  			cv = ld_dword(fs->win + bcl % (SS(fs) / 4) * 4);
  			if (cv == 0xFFFFFFFF) break;				/* Last link? */
  			if (cv != ++bcl) return FR_NO_FILESYSTEM;	/* Fragmented? */
  		}
  
  #if !FF_FS_READONLY
  		fs->last_clst = fs->free_clst = 0xFFFFFFFF;		/* Initialize cluster allocation information */
  #endif
  		fmt = FS_EXFAT;			/* FAT sub-type */
  	} else
  #endif	/* FF_FS_EXFAT */
  	{
  		if (ld_word(fs->win + BPB_BytsPerSec) != SS(fs)) return FR_NO_FILESYSTEM;	/* (BPB_BytsPerSec must be equal to the physical sector size) */
  
  		fasize = ld_word(fs->win + BPB_FATSz16);		/* Number of sectors per FAT */
  		if (fasize == 0) fasize = ld_dword(fs->win + BPB_FATSz32);
  		fs->fsize = fasize;
  
  		fs->n_fats = fs->win[BPB_NumFATs];				/* Number of FATs */
  		if (fs->n_fats != 1 && fs->n_fats != 2) return FR_NO_FILESYSTEM;	/* (Must be 1 or 2) */
  		fasize *= fs->n_fats;							/* Number of sectors for FAT area */
  
  		fs->csize = fs->win[BPB_SecPerClus];			/* Cluster size */
  		if (fs->csize == 0 || (fs->csize & (fs->csize - 1))) return FR_NO_FILESYSTEM;	/* (Must be power of 2) */
  
  		fs->n_rootdir = ld_word(fs->win + BPB_RootEntCnt);	/* Number of root directory entries */
  		if (fs->n_rootdir % (SS(fs) / SZDIRE)) return FR_NO_FILESYSTEM;	/* (Must be sector aligned) */
  
  		tsect = ld_word(fs->win + BPB_TotSec16);		/* Number of sectors on the volume */
  		if (tsect == 0) tsect = ld_dword(fs->win + BPB_TotSec32);
  
  		nrsv = ld_word(fs->win + BPB_RsvdSecCnt);		/* Number of reserved sectors */
  		if (nrsv == 0) return FR_NO_FILESYSTEM;			/* (Must not be 0) */
  
  		/* Determine the FAT sub type */
  		sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZDIRE);	/* RSV + FAT + DIR */
  		if (tsect < sysect) return FR_NO_FILESYSTEM;	/* (Invalid volume size) */
  		nclst = (tsect - sysect) / fs->csize;			/* Number of clusters */
  		if (nclst == 0) return FR_NO_FILESYSTEM;		/* (Invalid volume size) */
  		fmt = 0;
  		if (nclst <= MAX_FAT32) fmt = FS_FAT32;
  		if (nclst <= MAX_FAT16) fmt = FS_FAT16;
  		if (nclst <= MAX_FAT12) fmt = FS_FAT12;
  		if (fmt == 0) return FR_NO_FILESYSTEM;
  
  		/* Boundaries and Limits */
  		fs->n_fatent = nclst + 2;						/* Number of FAT entries */
  		fs->volbase = bsect;							/* Volume start sector */
  		fs->fatbase = bsect + nrsv; 					/* FAT start sector */
  		fs->database = bsect + sysect;					/* Data start sector */
  		if (fmt == FS_FAT32) {
  			if (ld_word(fs->win + BPB_FSVer32) != 0) return FR_NO_FILESYSTEM;	/* (Must be FAT32 revision 0.0) */
  			if (fs->n_rootdir != 0) return FR_NO_FILESYSTEM;	/* (BPB_RootEntCnt must be 0) */
  			fs->dirbase = ld_dword(fs->win + BPB_RootClus32);	/* Root directory start cluster */
  			szbfat = fs->n_fatent * 4;					/* (Needed FAT size) */
  		} else {
  			if (fs->n_rootdir == 0)	return FR_NO_FILESYSTEM;	/* (BPB_RootEntCnt must not be 0) */
  			fs->dirbase = fs->fatbase + fasize;			/* Root directory start sector */
  			szbfat = (fmt == FS_FAT16) ?				/* (Needed FAT size) */
  				fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
  		}
  		if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs)) return FR_NO_FILESYSTEM;	/* (BPB_FATSz must not be less than the size needed) */
  
  #if !FF_FS_READONLY
  		/* Get FSInfo if available */
  		fs->last_clst = fs->free_clst = 0xFFFFFFFF;		/* Initialize cluster allocation information */
  		fs->fsi_flag = 0x80;
  #if (FF_FS_NOFSINFO & 3) != 3
  		if (fmt == FS_FAT32				/* Allow to update FSInfo only if BPB_FSInfo32 == 1 */
  			&& ld_word(fs->win + BPB_FSInfo32) == 1
  			&& move_window(fs, bsect + 1) == FR_OK)
  		{
  			fs->fsi_flag = 0;
  			if (ld_word(fs->win + BS_55AA) == 0xAA55	/* Load FSInfo data if available */
  				&& ld_dword(fs->win + FSI_LeadSig) == 0x41615252
  				&& ld_dword(fs->win + FSI_StrucSig) == 0x61417272)
  			{
  #if (FF_FS_NOFSINFO & 1) == 0
  				fs->free_clst = ld_dword(fs->win + FSI_Free_Count);
  #endif
  #if (FF_FS_NOFSINFO & 2) == 0
  				fs->last_clst = ld_dword(fs->win + FSI_Nxt_Free);
  #endif
  			}
  		}
  #endif	/* (FF_FS_NOFSINFO & 3) != 3 */
  #endif	/* !FF_FS_READONLY */
  	}
  
  	fs->fs_type = (BYTE)fmt;/* FAT sub-type */
  	fs->id = ++Fsid;		/* Volume mount ID */
  #if FF_USE_LFN == 1
  	fs->lfnbuf = LfnBuf;	/* Static LFN working buffer */
  #if FF_FS_EXFAT
  	fs->dirbuf = DirBuf;	/* Static directory block scratchpad buuffer */
  #endif
  #endif
  #if FF_FS_RPATH != 0
  	fs->cdir = 0;			/* Initialize current directory */
  #endif
  #if FF_FS_LOCK != 0			/* Clear file lock semaphores */
  	clear_lock(fs);
  #endif
  	return FR_OK;
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Check if the file/directory object is valid or not                    */
  /*-----------------------------------------------------------------------*/
  
  static FRESULT validate (	/* Returns FR_OK or FR_INVALID_OBJECT */
  	FFOBJID* obj,			/* Pointer to the FFOBJID, the 1st member in the FIL/DIR object, to check validity */
  	FATFS** rfs				/* Pointer to pointer to the owner filesystem object to return */
  )
  {
  	FRESULT res = FR_INVALID_OBJECT;
  
  	if (obj && obj->fs && obj->fs->fs_type && obj->id == obj->fs->id) {	/* Test if the object is valid */
  #if FF_FS_REENTRANT
  		if (lock_fs(obj->fs)) {	/* Obtain the filesystem object */
  			if (!(disk_status(obj->fs->pdrv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
  				res = FR_OK;
  			} else {
  				unlock_fs(obj->fs, FR_OK);
  			}
  		} else {
  			res = FR_TIMEOUT;
  		}
  #else
  		if (!(disk_status(obj->fs->pdrv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
  			res = FR_OK;
  		}
  #endif
  	}
  	*rfs = (res == FR_OK) ? obj->fs : 0;	/* Corresponding filesystem object */
  	return res;
  }
  
  
  
  
  /*---------------------------------------------------------------------------
  
     Public Functions (FatFs API)
  
  ----------------------------------------------------------------------------*/
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Mount/Unmount a Logical Drive                                         */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_mount (
  	FATFS* fs,			/* Pointer to the filesystem object 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;
  	int vol;
  	FRESULT res;
  	const TCHAR *rp = path;
  
  
  	/* Get logical drive number */
  	vol = get_ldnumber(&rp);
  	if (vol < 0) return FR_INVALID_DRIVE;
  	cfs = FatFs[vol];					/* Pointer to fs object */
  
  	if (cfs) {
  #if FF_FS_LOCK != 0
  		clear_lock(cfs);
  #endif
  #if FF_FS_REENTRANT						/* Discard sync object of the current volume */
  		if (!ff_del_syncobj(cfs->sobj)) return FR_INT_ERR;
  #endif
  		cfs->fs_type = 0;				/* Clear old fs object */
  	}
  
  	if (fs) {
  		fs->fs_type = 0;				/* Clear new fs object */
  #if FF_FS_REENTRANT						/* Create sync object for the new volume */
  		if (!ff_cre_syncobj((BYTE)vol, &fs->sobj)) return FR_INT_ERR;
  #endif
  	}
  	FatFs[vol] = fs;					/* Register new fs object */
  
  	if (opt == 0) return FR_OK;			/* Do not mount now, it will be mounted later */
  
  	res = mount_volume(&path, &fs, 0);	/* Force mounted the volume */
  	LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Open or Create a File                                                 */
  /*-----------------------------------------------------------------------*/
  FRESULT f_open (
  	FIL* fp,			/* Pointer to the blank file object */
  	const TCHAR* path,	/* Pointer to the file name */
  	BYTE mode			/* Access mode and open mode flags */
  )
  {
  	DIR dj = {0};
  	return f_open_ex(fp, path, mode, &dj);
  }
  
  FRESULT f_open_ex (
  	FIL* fp,			/* Pointer to the blank file object */
  	const TCHAR* path,	/* Pointer to the file name */
  	BYTE mode,			/* Access mode and open mode flags */
  	DIR* dp             /* Pointer to dir object */
  )
  {
  	FRESULT res;
  	//DIR dj;
  	FATFS *fs;
  #if !FF_FS_READONLY
  	DWORD cl, bcs, clst, tm;
  	LBA_t sc;
  	FSIZE_t ofs;
  #endif
  	DEF_NAMBUF
  
  
  	if (!fp) return FR_INVALID_OBJECT;
  	if (!dp) 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) {
  		INIT_NAMBUF(fs);
  
  		dp->obj.fs = fs;
  		res = follow_path(dp, path);	/* Follow the file path */
  
  #if !FF_FS_READONLY	/* Read/Write configuration */
  		if (res == FR_OK) {
  			if (dp->fn[NSFLAG] & NS_NONAME) {	/* Origin directory itself? */
  				res = FR_INVALID_NAME;
  			}
  #if FF_FS_LOCK != 0
  			else {
  				res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);		/* Check if the file can be used */
  			}
  #endif
  		}
  		/* Create or Open a file */
  		if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
  			if (res != FR_OK) {					/* No file, create new */
  				if (res == FR_NO_FILE) {		/* There is no file to open, create a new entry */
  #if FF_FS_LOCK != 0
  					res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
  #else
  					res = dir_register(dp);
  #endif
  				}
  				mode |= FA_CREATE_ALWAYS;		/* File is created */
  			}
  			else {								/* Any object with the same name is already existing */
  				if (dp->obj.attr & (AM_RDO | AM_DIR)) {	/* Cannot overwrite it (R/O or DIR) */
  					res = FR_DENIED;
  				} else {
  					if (mode & FA_CREATE_NEW) res = FR_EXIST;	/* Cannot create as new file */
  				}
  			}
  			if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {	/* Truncate the file if overwrite mode */
  #if FF_FS_EXFAT
  				if (fs->fs_type == FS_EXFAT) {
  					/* Get current allocation info */
  					fp->obj.fs = fs;
  					init_alloc_info(fs, &fp->obj);
  					/* Set directory entry block initial state */
  					memset(fs->dirbuf + 2, 0, 30);	/* Clear 85 entry except for NumSec */
  					memset(fs->dirbuf + 38, 0, 26);	/* Clear C0 entry except for NumName and NameHash */
  					fs->dirbuf[XDIR_Attr] = AM_ARC;
  					st_dword(fs->dirbuf + XDIR_CrtTime, GET_FATTIME());
  					fs->dirbuf[XDIR_GenFlags] = 1;
  					res = store_xdir(dp);
  					if (res == FR_OK && fp->obj.sclust != 0) {	/* Remove the cluster chain if exist */
  						res = remove_chain(&fp->obj, fp->obj.sclust, 0);
  						fs->last_clst = fp->obj.sclust - 1;		/* Reuse the cluster hole */
  					}
  				} else
  #endif
  				{
  					/* Set directory entry initial state */
  					tm = GET_FATTIME();					/* Set created time */
  					st_dword(dp->dir + DIR_CrtTime, tm);
  					st_dword(dp->dir + DIR_ModTime, tm);
  					cl = ld_clust(fs, dp->dir);			/* Get current cluster chain */
  					dp->dir[DIR_Attr] = AM_ARC;			/* Reset attribute */
  					st_clust(fs, dp->dir, 0);			/* Reset file allocation info */
  					st_dword(dp->dir + DIR_FileSize, 0);
  					fs->wflag = 1;
  					if (cl != 0) {						/* Remove the cluster chain if exist */
  						sc = fs->winsect;
  						res = remove_chain(&dp->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 (dp->obj.attr & AM_DIR) {		/* File open against a directory */
  					res = FR_NO_FILE;
  				} else {
  					if ((mode & FA_WRITE) && (dp->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 = dp->dir;
  #if FF_FS_LOCK != 0
  			fp->obj.lockid = inc_lock(dp, (mode & ~FA_READ) ? 1 : 0);	/* Lock the file for this session */
  			if (fp->obj.lockid == 0) res = FR_INT_ERR;
  #endif
  		}
  #else		/* R/O configuration */
  		if (res == FR_OK) {
  			if (dp->fn[NSFLAG] & NS_NONAME) {	/* Is it origin directory itself? */
  				res = FR_INVALID_NAME;
  			} else {
  				if (dp->obj.attr & AM_DIR) {		/* Is it a directory? */
  					res = FR_NO_FILE;
  				}
  			}
  		}
  #endif
  
  		if (res == FR_OK) {
  #if FF_FS_EXFAT
  			if (fs->fs_type == FS_EXFAT) {
  				fp->obj.c_scl = dp->obj.sclust;							/* Get containing directory info */
  				fp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
  				fp->obj.c_ofs = dp->blk_ofs;
  				init_alloc_info(fs, &fp->obj);
  			} else
  #endif
  			{
  				fp->obj.sclust = ld_clust(fs, dp->dir);					/* Get object allocation info */
  				fp->obj.objsize = ld_dword(dp->dir + DIR_FileSize);
  			}
  #if FF_USE_FASTSEEK
  			fp->cltbl = 0;		/* Disable fast seek mode */
  #endif
  			fp->obj.fs = fs;	/* Validate the file object */
  			fp->obj.id = fs->id;
  			fp->flag = mode;	/* Set file access mode */
  			fp->err = 0;		/* Clear error flag */
  			fp->sect = 0;		/* Invalidate current data sector */
  			fp->fptr = 0;		/* Set file pointer top of the file */
  #if !FF_FS_READONLY
  #if !FF_FS_TINY
  			memset(fp->buf, 0, sizeof fp->buf);	/* Clear sector buffer */
  #endif
  			if ((mode & FA_SEEKEND) && fp->obj.objsize > 0) {	/* Seek to end of file if FA_OPEN_APPEND is specified */
  				fp->fptr = fp->obj.objsize;			/* Offset to seek */
  				bcs = (DWORD)fs->csize * SS(fs);	/* Cluster size in byte */
  				clst = fp->obj.sclust;				/* Follow the cluster chain */
  				for (ofs = fp->obj.objsize; res == FR_OK && ofs > bcs; ofs -= bcs) {
  					clst = get_fat(&fp->obj, clst);
  					if (clst <= 1) res = FR_INT_ERR;
  					if (clst == 0xFFFFFFFF) res = FR_DISK_ERR;
  				}
  				fp->clust = clst;
  				if (res == FR_OK && ofs % SS(fs)) {	/* Fill sector buffer if not on the sector boundary */
  					sc = clst2sect(fs, clst);
  					if (sc == 0) {
  						res = FR_INT_ERR;
  					} else {
  						fp->sect = sc + (DWORD)(ofs / SS(fs));
  #if !FF_FS_TINY
  						if (disk_read(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) res = FR_DISK_ERR;
  #endif
  					}
  				}
  #if FF_FS_LOCK != 0
  				if (res != FR_OK) dec_lock(fp->obj.lockid); /* Decrement file open counter if seek failed */
  #endif
  			}
  #endif
  		}
  
  		FREE_NAMBUF();
  	}
  
  	if (res != FR_OK) fp->obj.fs = 0;	/* Invalidate file object on error */
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Read File                                                             */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_read (
  	FIL* fp, 	/* 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;
  	FATFS *fs;
  	DWORD clst;
  	LBA_t sect;
  	FSIZE_t remain;
  	UINT rcnt, cc, csect;
  	BYTE *rbuff = (BYTE*)buff;
  
  
  	*br = 0;	/* Clear read byte counter */
  	res = validate(&fp->obj, &fs);				/* Check validity of the file object */
  	if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);	/* Check validity */
  	if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED); /* Check access mode */
  	remain = fp->obj.objsize - fp->fptr;
  	if (btr > remain) btr = (UINT)remain;		/* Truncate btr by remaining bytes */
  
  	for ( ; btr > 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 */
  #if FF_USE_FASTSEEK
  					if (fp->cltbl) {
  						clst = clmt_clust(fp, fp->fptr);	/* Get cluster# from the CLMT */
  					} else
  #endif
  					{
  						clst = get_fat(&fp->obj, fp->clust);	/* Follow cluster chain on the FAT */
  					}
  				}
  				if (clst < 2) ABORT(fs, FR_INT_ERR);
  				if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
  				fp->clust = clst;				/* Update current cluster */
  			}
  			sect = clst2sect(fs, fp->clust);	/* Get current sector */
  			if (sect == 0) ABORT(fs, FR_INT_ERR);
  			sect += csect;
  			cc = btr / SS(fs);					/* When remaining bytes >= sector size, */
  			if (cc > 0) {						/* Read maximum contiguous sectors directly */
  				if (csect + cc > fs->csize) {	/* Clip at cluster boundary */
  					cc = fs->csize - csect;
  				}
  				if (disk_read(fs->pdrv, rbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
  #if !FF_FS_READONLY && FF_FS_MINIMIZE <= 2		/* Replace one of the read sectors with cached data if it contains a dirty sector */
  #if FF_FS_TINY
  				if (fs->wflag && fs->winsect - sect < cc) {
  					memcpy(rbuff + ((fs->winsect - sect) * SS(fs)), fs->win, SS(fs));
  				}
  #else
  				if ((fp->flag & FA_DIRTY) && fp->sect - sect < cc) {
  					memcpy(rbuff + ((fp->sect - sect) * SS(fs)), fp->buf, SS(fs));
  				}
  #endif
  #endif
  				rcnt = SS(fs) * cc;				/* Number of bytes transferred */
  				continue;
  			}
  #if !FF_FS_TINY
  			if (fp->sect != sect) {			/* Load data sector if not in cache */
  #if !FF_FS_READONLY
  				if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
  					if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
  					fp->flag &= (BYTE)~FA_DIRTY;
  				}
  #endif
  				if (disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK)	ABORT(fs, FR_DISK_ERR);	/* Fill sector cache */
  			}
  #endif
  			fp->sect = sect;
  		}
  		rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes remains in the sector */
  		if (rcnt > btr) rcnt = btr;					/* Clip it by btr if needed */
  #if FF_FS_TINY
  		if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window */
  		memcpy(rbuff, fs->win + fp->fptr % SS(fs), rcnt);	/* Extract partial sector */
  #else
  		memcpy(rbuff, fp->buf + fp->fptr % SS(fs), rcnt);	/* Extract partial sector */
  #endif
  	}
  
  	LEAVE_FF(fs, FR_OK);
  }
  
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Write File                                                            */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_write (
  	FIL* fp,			/* 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;
  	FATFS *fs;
  	DWORD clst;
  	LBA_t sect;
  	UINT wcnt, cc, csect;
  	const BYTE *wbuff = (const BYTE*)buff;
  
  
  	*bw = 0;	/* Clear write byte counter */
  	res = validate(&fp->obj, &fs);			/* Check validity of the file object */
  	if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);	/* Check validity */
  	if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */
  
  	/* Check fptr wrap-around (file size cannot reach 4 GiB at FAT volume) */
  	if ((!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) && (DWORD)(fp->fptr + btw) < (DWORD)fp->fptr) {
  		btw = (UINT)(0xFFFFFFFF - (DWORD)fp->fptr);
  	}
  
  	for ( ; btw > 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 */
  #if FF_USE_FASTSEEK
  					if (fp->cltbl) {
  						clst = clmt_clust(fp, fp->fptr);	/* Get cluster# from the CLMT */
  					} else
  #endif
  					{
  						clst = create_chain(&fp->obj, fp->clust);	/* Follow or stretch cluster chain on the FAT */
  					}
  				}
  				if (clst == 0) break;		/* Could not allocate a new cluster (disk full) */
  				if (clst == 1) ABORT(fs, FR_INT_ERR);
  				if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
  				fp->clust = clst;			/* Update current cluster */
  				if (fp->obj.sclust == 0) fp->obj.sclust = clst;	/* Set start cluster if the first write */
  			}
  #if FF_FS_TINY
  			if (fs->winsect == fp->sect && sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Write-back sector cache */
  #else
  			if (fp->flag & FA_DIRTY) {		/* Write-back sector cache */
  				if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
  				fp->flag &= (BYTE)~FA_DIRTY;
  			}
  #endif
  			sect = clst2sect(fs, fp->clust);	/* Get current sector */
  			if (sect == 0) ABORT(fs, FR_INT_ERR);
  			sect += csect;
  			cc = btw / SS(fs);				/* When remaining bytes >= sector size, */
  			if (cc > 0) {					/* Write maximum contiguous sectors directly */
  				if (csect + cc > fs->csize) {	/* Clip at cluster boundary */
  					cc = fs->csize - csect;
  				}
  				if (disk_write(fs->pdrv, wbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
  #if FF_FS_MINIMIZE <= 2
  #if FF_FS_TINY
  				if (fs->winsect - sect < cc) {	/* Refill sector cache if it gets invalidated by the direct write */
  					memcpy(fs->win, wbuff + ((fs->winsect - sect) * SS(fs)), SS(fs));
  					fs->wflag = 0;
  				}
  #else
  				if (fp->sect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
  					memcpy(fp->buf, wbuff + ((fp->sect - sect) * SS(fs)), SS(fs));
  					fp->flag &= (BYTE)~FA_DIRTY;
  				}
  #endif
  #endif
  				wcnt = SS(fs) * cc;		/* Number of bytes transferred */
  				continue;
  			}
  #if FF_FS_TINY
  			if (fp->fptr >= fp->obj.objsize) {	/* Avoid silly cache filling on the growing edge */
  				if (sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);
  				fs->winsect = sect;
  			}
  #else
  			if (fp->sect != sect && 		/* Fill sector cache with file data */
  				fp->fptr < fp->obj.objsize &&
  				disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) {
  					ABORT(fs, FR_DISK_ERR);
  			}
  #endif
  			fp->sect = sect;
  		}
  		wcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes remains in the sector */
  		if (wcnt > btw) wcnt = btw;					/* Clip it by btw if needed */
  #if FF_FS_TINY
  		if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window */
  		memcpy(fs->win + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
  		fs->wflag = 1;
  #else
  		memcpy(fp->buf + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
  		fp->flag |= FA_DIRTY;
  #endif
  	}
  
  	fp->flag |= FA_MODIFIED;				/* Set file change flag */
  
  	LEAVE_FF(fs, FR_OK);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Synchronize the File                                                  */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_sync (
  	FIL* fp		/* Open file to be synced */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  	DWORD tm;
  	BYTE *dir;
  
  
  	res = validate(&fp->obj, &fs);	/* Check validity of the file object */
  	if (res == FR_OK) {
  		if (fp->flag & FA_MODIFIED) {	/* Is there any change to the file? */
  #if !FF_FS_TINY
  			if (fp->flag & FA_DIRTY) {	/* Write-back cached data if needed */
  				if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) LEAVE_FF(fs, FR_DISK_ERR);
  				fp->flag &= (BYTE)~FA_DIRTY;
  			}
  #endif
  			/* Update the directory entry */
  			tm = GET_FATTIME();				/* Modified time */
  #if FF_FS_EXFAT
  			if (fs->fs_type == FS_EXFAT) {
  				res = fill_first_frag(&fp->obj);	/* Fill first fragment on the FAT if needed */
  				if (res == FR_OK) {
  					res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);	/* Fill last fragment on the FAT if needed */
  				}
  				if (res == FR_OK) {
  					DIR dj;
  					DEF_NAMBUF
  
  					INIT_NAMBUF(fs);
  					res = load_obj_xdir(&dj, &fp->obj);	/* Load directory entry block */
  					if (res == FR_OK) {
  						fs->dirbuf[XDIR_Attr] |= AM_ARC;				/* Set archive attribute to indicate that the file has been changed */
  						fs->dirbuf[XDIR_GenFlags] = fp->obj.stat | 1;	/* Update file allocation information */
  						st_dword(fs->dirbuf + XDIR_FstClus, fp->obj.sclust);		/* Update start cluster */
  						st_qword(fs->dirbuf + XDIR_FileSize, fp->obj.objsize);		/* Update file size */
  						st_qword(fs->dirbuf + XDIR_ValidFileSize, fp->obj.objsize);	/* (FatFs does not support Valid File Size feature) */
  						st_dword(fs->dirbuf + XDIR_ModTime, tm);		/* Update modified time */
  						fs->dirbuf[XDIR_ModTime10] = 0;
  						st_dword(fs->dirbuf + XDIR_AccTime, 0);
  						res = store_xdir(&dj);	/* Restore it to the directory */
  						if (res == FR_OK) {
  							res = sync_fs(fs);
  							fp->flag &= (BYTE)~FA_MODIFIED;
  						}
  					}
  					FREE_NAMBUF();
  				}
  			} else
  #endif
  			{
  				res = move_window(fs, fp->dir_sect);
  				if (res == FR_OK) {
  					dir = fp->dir_ptr;
  					dir[DIR_Attr] |= AM_ARC;						/* Set archive attribute to indicate that the file has been changed */
  					st_clust(fp->obj.fs, dir, fp->obj.sclust);		/* Update file allocation information  */
  					st_dword(dir + DIR_FileSize, (DWORD)fp->obj.objsize);	/* Update file size */
  					st_dword(dir + DIR_ModTime, tm);				/* Update modified time */
  					st_word(dir + DIR_LstAccDate, 0);
  					fs->wflag = 1;
  					res = sync_fs(fs);					/* Restore it to the directory */
  					fp->flag &= (BYTE)~FA_MODIFIED;
  				}
  			}
  		}
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  #endif /* !FF_FS_READONLY */
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Close File                                                            */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_close (
  	FIL* fp		/* Open file to be closed */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  
  #if !FF_FS_READONLY
  	res = f_sync(fp);					/* Flush cached data */
  	if (res == FR_OK)
  #endif
  	{
  		res = validate(&fp->obj, &fs);	/* Lock volume */
  		if (res == FR_OK) {
  #if FF_FS_LOCK != 0
  			res = dec_lock(fp->obj.lockid);		/* Decrement file open counter */
  			if (res == FR_OK) fp->obj.fs = 0;	/* Invalidate file object */
  #else
  			fp->obj.fs = 0;	/* Invalidate file object */
  #endif
  #if FF_FS_REENTRANT
  			unlock_fs(fs, FR_OK);		/* Unlock volume */
  #endif
  		}
  	}
  	return res;
  }
  
  
  
  
  #if FF_FS_RPATH >= 1
  /*-----------------------------------------------------------------------*/
  /* Change Current Directory or Current Drive, Get Current Directory      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_chdrive (
  	const TCHAR* path		/* Drive number to set */
  )
  {
  	int vol;
  
  
  	/* Get logical drive number */
  	vol = get_ldnumber(&path);
  	if (vol < 0) return FR_INVALID_DRIVE;
  	CurrVol = (BYTE)vol;	/* Set it as current volume */
  
  	return FR_OK;
  }
  
  
  
  FRESULT f_chdir (
  	const TCHAR* path	/* Pointer to the directory path */
  )
  {
  #if FF_STR_VOLUME_ID == 2
  	UINT i;
  #endif
  	FRESULT res;
  	DIR dj;
  	FATFS *fs;
  	DEF_NAMBUF
  
  
  	/* Get logical drive */
  	res = mount_volume(&path, &fs, 0);
  	if (res == FR_OK) {
  		dj.obj.fs = fs;
  		INIT_NAMBUF(fs);
  		res = follow_path(&dj, path);		/* Follow the path */
  		if (res == FR_OK) {					/* Follow completed */
  			if (dj.fn[NSFLAG] & NS_NONAME) {	/* Is it the start directory itself? */
  				fs->cdir = dj.obj.sclust;
  #if FF_FS_EXFAT
  				if (fs->fs_type == FS_EXFAT) {
  					fs->cdc_scl = dj.obj.c_scl;
  					fs->cdc_size = dj.obj.c_size;
  					fs->cdc_ofs = dj.obj.c_ofs;
  				}
  #endif
  			} else {
  				if (dj.obj.attr & AM_DIR) {	/* It is a sub-directory */
  #if FF_FS_EXFAT
  					if (fs->fs_type == FS_EXFAT) {
  						fs->cdir = ld_dword(fs->dirbuf + XDIR_FstClus);		/* Sub-directory cluster */
  						fs->cdc_scl = dj.obj.sclust;						/* Save containing directory information */
  						fs->cdc_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
  						fs->cdc_ofs = dj.blk_ofs;
  					} else
  #endif
  					{
  						fs->cdir = ld_clust(fs, dj.dir);					/* Sub-directory cluster */
  					}
  				} else {
  					res = FR_NO_PATH;		/* Reached but a file */
  				}
  			}
  		}
  		FREE_NAMBUF();
  		if (res == FR_NO_FILE) res = FR_NO_PATH;
  #if FF_STR_VOLUME_ID == 2	/* Also current drive is changed if in Unix style volume ID */
  		if (res == FR_OK) {
  			for (i = FF_VOLUMES - 1; i && fs != FatFs[i]; i--) ;	/* Set current drive */
  			CurrVol = (BYTE)i;
  		}
  #endif
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  
  #if FF_FS_RPATH >= 2
  FRESULT f_getcwd (
  	TCHAR* buff,	/* Pointer to the directory path */
  	UINT len		/* Size of buff in unit of TCHAR */
  )
  {
  	FRESULT res;
  	DIR dj;
  	FATFS *fs;
  	UINT i, n;
  	DWORD ccl;
  	TCHAR *tp = buff;
  #if FF_VOLUMES >= 2
  	UINT vl;
  #if FF_STR_VOLUME_ID
  	const char *vp;
  #endif
  #endif
  	FILINFO fno;
  	DEF_NAMBUF
  
  
  	/* Get logical drive */
  	buff[0] = 0;	/* Set null string to get current volume */
  	res = mount_volume((const TCHAR**)&buff, &fs, 0);	/* Get current volume */
  	if (res == FR_OK) {
  		dj.obj.fs = fs;
  		INIT_NAMBUF(fs);
  
  		/* Follow parent directories and create the path */
  		i = len;			/* Bottom of buffer (directory stack base) */
  		if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {	/* (Cannot do getcwd on exFAT and returns root path) */
  			dj.obj.sclust = fs->cdir;				/* Start to follow upper directory from current directory */
  			while ((ccl = dj.obj.sclust) != 0) {	/* Repeat while current directory is a sub-directory */
  				res = dir_sdi(&dj, 1 * SZDIRE);	/* Get parent directory */
  				if (res != FR_OK) break;
  				res = move_window(fs, dj.sect);
  				if (res != FR_OK) break;
  				dj.obj.sclust = ld_clust(fs, dj.dir);	/* Goto parent directory */
  				res = dir_sdi(&dj, 0);
  				if (res != FR_OK) break;
  				do {							/* Find the entry links to the child directory */
  					res = DIR_READ_FILE(&dj);
  					if (res != FR_OK) break;
  					if (ccl == ld_clust(fs, dj.dir)) break;	/* Found the entry */
  					res = dir_next(&dj, 0);
  				} while (res == FR_OK);
  				if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
  				if (res != FR_OK) break;
  				get_fileinfo(&dj, &fno);		/* Get the directory name and push it to the buffer */
  				for (n = 0; fno.fname[n]; n++) ;	/* Name length */
  				if (i < n + 1) {	/* Insufficient space to store the path name? */
  					res = FR_NOT_ENOUGH_CORE; break;
  				}
  				while (n) buff[--i] = fno.fname[--n];	/* Stack the name */
  				buff[--i] = '/';
  			}
  		}
  		if (res == FR_OK) {
  			if (i == len) buff[--i] = '/';	/* Is it the root-directory? */
  #if FF_VOLUMES >= 2			/* Put drive prefix */
  			vl = 0;
  #if FF_STR_VOLUME_ID >= 1	/* String volume ID */
  			for (n = 0, vp = (const char*)VolumeStr[CurrVol]; vp[n]; n++) ;
  			if (i >= n + 2) {
  				if (FF_STR_VOLUME_ID == 2) *tp++ = (TCHAR)'/';
  				for (vl = 0; vl < n; *tp++ = (TCHAR)vp[vl], vl++) ;
  				if (FF_STR_VOLUME_ID == 1) *tp++ = (TCHAR)':';
  				vl++;
  			}
  #else						/* Numeric volume ID */
  			if (i >= 3) {
  				*tp++ = (TCHAR)'0' + CurrVol;
  				*tp++ = (TCHAR)':';
  				vl = 2;
  			}
  #endif
  			if (vl == 0) res = FR_NOT_ENOUGH_CORE;
  #endif
  			/* Add current directory path */
  			if (res == FR_OK) {
  				do *tp++ = buff[i++]; while (i < len);	/* Copy stacked path string */
  			}
  		}
  		FREE_NAMBUF();
  	}
  
  	*tp = 0;
  	LEAVE_FF(fs, res);
  }
  
  #endif /* FF_FS_RPATH >= 2 */
  #endif /* FF_FS_RPATH >= 1 */
  
  
  
  #if FF_FS_MINIMIZE <= 2
  /*-----------------------------------------------------------------------*/
  /* Seek File Read/Write Pointer                                          */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_lseek (
  	FIL* fp,		/* Pointer to the file object */
  	FSIZE_t ofs		/* File pointer from top of file */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  	DWORD clst, bcs;
  	LBA_t nsect;
  	FSIZE_t ifptr;
  #if FF_USE_FASTSEEK
  	DWORD cl, pcl, ncl, tcl, tlen, ulen;
  	DWORD *tbl;
  	LBA_t dsc;
  #endif
  
  	res = validate(&fp->obj, &fs);		/* Check validity of the file object */
  	if (res == FR_OK) res = (FRESULT)fp->err;
  #if FF_FS_EXFAT && !FF_FS_READONLY
  	if (res == FR_OK && fs->fs_type == FS_EXFAT) {
  		res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);	/* Fill last fragment on the FAT if needed */
  	}
  #endif
  	if (res != FR_OK) LEAVE_FF(fs, res);
  
  #if FF_USE_FASTSEEK
  	if (fp->cltbl) {	/* Fast seek */
  		if (ofs == CREATE_LINKMAP) {	/* Create CLMT */
  			tbl = fp->cltbl;
  			tlen = *tbl++; ulen = 2;	/* Given table size and required table size */
  			cl = fp->obj.sclust;		/* Origin of the chain */
  			if (cl != 0) {
  				do {
  					/* Get a fragment */
  					tcl = cl; ncl = 0; ulen += 2;	/* Top, length and used items */
  					do {
  						pcl = cl; ncl++;
  						cl = get_fat(&fp->obj, cl);
  						if (cl <= 1) ABORT(fs, FR_INT_ERR);
  						if (cl == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
  					} while (cl == pcl + 1);
  					if (ulen <= tlen) {		/* Store the length and top of the fragment */
  						*tbl++ = ncl; *tbl++ = tcl;
  					}
  				} while (cl < fs->n_fatent);	/* Repeat until end of chain */
  			}
  			*fp->cltbl = ulen;	/* Number of items used */
  			if (ulen <= tlen) {
  				*tbl = 0;		/* Terminate table */
  			} else {
  				res = FR_NOT_ENOUGH_CORE;	/* Given table size is smaller than required */
  			}
  		} else {						/* Fast seek */
  			if (ofs > fp->obj.objsize) ofs = fp->obj.objsize;	/* Clip offset at the file size */
  			fp->fptr = ofs;				/* Set file pointer */
  			if (ofs > 0) {
  				fp->clust = clmt_clust(fp, ofs - 1);
  				dsc = clst2sect(fs, fp->clust);
  				if (dsc == 0) ABORT(fs, FR_INT_ERR);
  				dsc += (DWORD)((ofs - 1) / SS(fs)) & (fs->csize - 1);
  				if (fp->fptr % SS(fs) && dsc != fp->sect) {	/* Refill sector cache if needed */
  #if !FF_FS_TINY
  #if !FF_FS_READONLY
  					if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
  						if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
  						fp->flag &= (BYTE)~FA_DIRTY;
  					}
  #endif
  					if (disk_read(fs->pdrv, fp->buf, dsc, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);	/* Load current sector */
  #endif
  					fp->sect = dsc;
  				}
  			}
  		}
  	} else
  #endif
  
  	/* Normal Seek */
  	{
  #if FF_FS_EXFAT
  		if (fs->fs_type != FS_EXFAT && ofs >= 0x100000000) ofs = 0xFFFFFFFF;	/* Clip at 4 GiB - 1 if at FATxx */
  #endif
  		if (ofs > fp->obj.objsize && (FF_FS_READONLY || !(fp->flag & FA_WRITE))) {	/* In read-only mode, clip offset with the file size */
  			ofs = fp->obj.objsize;
  		}
  		ifptr = fp->fptr;
  		fp->fptr = nsect = 0;
  		if (ofs > 0) {
  			bcs = (DWORD)fs->csize * SS(fs);	/* Cluster size (byte) */
  			if (ifptr > 0 &&
  				(ofs - 1) / bcs >= (ifptr - 1) / bcs) {	/* When seek to same or following cluster, */
  				fp->fptr = (ifptr - 1) & ~(FSIZE_t)(bcs - 1);	/* start from the current cluster */
  				ofs -= fp->fptr;
  				clst = fp->clust;
  			} else {									/* When seek to back cluster, */
  				clst = fp->obj.sclust;					/* start from the first cluster */
  #if !FF_FS_READONLY
  				if (clst == 0) {						/* If no cluster chain, create a new chain */
  					clst = create_chain(&fp->obj, 0);
  					if (clst == 1) ABORT(fs, FR_INT_ERR);
  					if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
  					fp->obj.sclust = clst;
  				}
  #endif
  				fp->clust = clst;
  			}
  			if (clst != 0) {
  				while (ofs > bcs) {						/* Cluster following loop */
  					ofs -= bcs; fp->fptr += bcs;
  #if !FF_FS_READONLY
  					if (fp->flag & FA_WRITE) {			/* Check if in write mode or not */
  						if (FF_FS_EXFAT && fp->fptr > fp->obj.objsize) {	/* No FAT chain object needs correct objsize to generate FAT value */
  							fp->obj.objsize = fp->fptr;
  							fp->flag |= FA_MODIFIED;
  						}
  						clst = create_chain(&fp->obj, clst);	/* Follow chain with forceed stretch */
  						if (clst == 0) {				/* Clip file size in case of disk full */
  							ofs = 0; break;
  						}
  					} else
  #endif
  					{
  						clst = get_fat(&fp->obj, clst);	/* Follow cluster chain if not in write mode */
  					}
  					if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
  					if (clst <= 1 || clst >= fs->n_fatent) ABORT(fs, FR_INT_ERR);
  					fp->clust = clst;
  				}
  				fp->fptr += ofs;
  				if (ofs % SS(fs)) {
  					nsect = clst2sect(fs, clst);	/* Current sector */
  					if (nsect == 0) ABORT(fs, FR_INT_ERR);
  					nsect += (DWORD)(ofs / SS(fs));
  				}
  			}
  		}
  		if (!FF_FS_READONLY && fp->fptr > fp->obj.objsize) {	/* Set file change flag if the file size is extended */
  			fp->obj.objsize = fp->fptr;
  			fp->flag |= FA_MODIFIED;
  		}
  		if (fp->fptr % SS(fs) && nsect != fp->sect) {	/* Fill sector cache if needed */
  #if !FF_FS_TINY
  #if !FF_FS_READONLY
  			if (fp->flag & FA_DIRTY) {			/* Write-back dirty sector cache */
  				if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
  				fp->flag &= (BYTE)~FA_DIRTY;
  			}
  #endif
  			if (disk_read(fs->pdrv, fp->buf, nsect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);	/* Fill sector cache */
  #endif
  			fp->sect = nsect;
  		}
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  #if FF_FS_MINIMIZE <= 1
  /*-----------------------------------------------------------------------*/
  /* Create a Directory Object                                             */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_opendir (
  	DIR* dp,			/* Pointer to directory object to create */
  	const TCHAR* path	/* Pointer to the directory path */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  	DEF_NAMBUF
  
  
  	if (!dp) return FR_INVALID_OBJECT;
  
  	/* Get logical drive */
  	res = mount_volume(&path, &fs, 0);
  	if (res == FR_OK) {
  		dp->obj.fs = fs;
  		INIT_NAMBUF(fs);
  		res = follow_path(dp, path);			/* Follow the path to the directory */
  		if (res == FR_OK) {						/* Follow completed */
  			if (!(dp->fn[NSFLAG] & NS_NONAME)) {	/* It is not the origin directory itself */
  				if (dp->obj.attr & AM_DIR) {		/* This object is a sub-directory */
  #if FF_FS_EXFAT
  					if (fs->fs_type == FS_EXFAT) {
  						dp->obj.c_scl = dp->obj.sclust;							/* Get containing directory inforamation */
  						dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
  						dp->obj.c_ofs = dp->blk_ofs;
  						init_alloc_info(fs, &dp->obj);	/* Get object allocation info */
  					} else
  #endif
  					{
  						dp->obj.sclust = ld_clust(fs, dp->dir);	/* Get object allocation info */
  					}
  				} else {						/* This object is a file */
  					res = FR_NO_PATH;
  				}
  			}
  			if (res == FR_OK) {
  				dp->obj.id = fs->id;
  				res = dir_sdi(dp, 0);			/* Rewind directory */
  #if FF_FS_LOCK != 0
  				if (res == FR_OK) {
  					if (dp->obj.sclust != 0) {
  						dp->obj.lockid = inc_lock(dp, 0);	/* Lock the sub directory */
  						if (!dp->obj.lockid) res = FR_TOO_MANY_OPEN_FILES;
  					} else {
  						dp->obj.lockid = 0;	/* Root directory need not to be locked */
  					}
  				}
  #endif
  			}
  		}
  		FREE_NAMBUF();
  		if (res == FR_NO_FILE) res = FR_NO_PATH;
  	}
  	if (res != FR_OK) dp->obj.fs = 0;		/* Invalidate the directory object if function faild */
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Close Directory                                                       */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_closedir (
  	DIR *dp		/* Pointer to the directory object to be closed */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  
  
  	res = validate(&dp->obj, &fs);	/* Check validity of the file object */
  	if (res == FR_OK) {
  #if FF_FS_LOCK != 0
  		if (dp->obj.lockid) res = dec_lock(dp->obj.lockid);	/* Decrement sub-directory open counter */
  		if (res == FR_OK) dp->obj.fs = 0;	/* Invalidate directory object */
  #else
  		dp->obj.fs = 0;	/* Invalidate directory object */
  #endif
  #if FF_FS_REENTRANT
  		unlock_fs(fs, FR_OK);		/* Unlock volume */
  #endif
  	}
  	return res;
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Read Directory Entries in Sequence                                    */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_readdir (
  	DIR* dp,			/* Pointer to the open directory object */
  	FILINFO* fno		/* Pointer to file information to return */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  	DEF_NAMBUF
  
  
  	res = validate(&dp->obj, &fs);	/* Check validity of the directory object */
  	if (res == FR_OK) {
  		if (!fno) {
  			res = dir_sdi(dp, 0);			/* Rewind the directory object */
  		} else {
  			INIT_NAMBUF(fs);
  			res = DIR_READ_FILE(dp);		/* Read an item */
  			if (res == FR_NO_FILE) res = FR_OK;	/* Ignore end of directory */
  			if (res == FR_OK) {				/* A valid entry is found */
  				get_fileinfo(dp, fno);		/* Get the object information */
  				res = dir_next(dp, 0);		/* Increment index for next */
  				if (res == FR_NO_FILE) res = FR_OK;	/* Ignore end of directory now */
  			}
  			FREE_NAMBUF();
  		}
  	}
  	LEAVE_FF(fs, res);
  }
  
  
  
  #if FF_USE_FIND
  /*-----------------------------------------------------------------------*/
  /* Find Next File                                                        */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_findnext (
  	DIR* dp,		/* Pointer to the open directory object */
  	FILINFO* fno	/* Pointer to the file information structure */
  )
  {
  	FRESULT res;
  
  
  	for (;;) {
  		res = f_readdir(dp, fno);		/* Get a directory item */
  		if (res != FR_OK || !fno || !fno->fname[0]) break;	/* Terminate if any error or end of directory */
  		if (pattern_match(dp->pat, fno->fname, 0, FIND_RECURS)) break;		/* Test for the file name */
  #if FF_USE_LFN && FF_USE_FIND == 2
  		if (pattern_match(dp->pat, fno->altname, 0, FIND_RECURS)) break;	/* Test for alternative name if exist */
  #endif
  	}
  	return res;
  }
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Find First File                                                       */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_findfirst (
  	DIR* dp,				/* Pointer to the blank directory object */
  	FILINFO* fno,			/* Pointer to the file information structure */
  	const TCHAR* path,		/* Pointer to the directory to open */
  	const TCHAR* pattern	/* Pointer to the matching pattern */
  )
  {
  	FRESULT res;
  
  
  	dp->pat = pattern;		/* Save pointer to pattern string */
  	res = f_opendir(dp, path);		/* Open the target directory */
  	if (res == FR_OK) {
  		res = f_findnext(dp, fno);	/* Find the first item */
  	}
  	return res;
  }
  
  #endif	/* FF_USE_FIND */
  
  
  
  #if FF_FS_MINIMIZE == 0
  /*-----------------------------------------------------------------------*/
  /* Get File Status                                                       */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_stat (
  	const TCHAR* path,	/* Pointer to the file path */
  	FILINFO* fno		/* Pointer to file information to return */
  )
  {
  	FRESULT res;
  	DIR dj;
  	DEF_NAMBUF
  
  
  	/* Get logical drive */
  	res = mount_volume(&path, &dj.obj.fs, 0);
  	if (res == FR_OK) {
  		INIT_NAMBUF(dj.obj.fs);
  		res = follow_path(&dj, path);	/* Follow the file path */
  		if (res == FR_OK) {				/* Follow completed */
  			if (dj.fn[NSFLAG] & NS_NONAME) {	/* It is origin directory */
  				res = FR_INVALID_NAME;
  			} else {							/* Found an object */
  				if (fno) get_fileinfo(&dj, fno);
  			}
  		}
  		FREE_NAMBUF();
  	}
  
  	LEAVE_FF(dj.obj.fs, res);
  }
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Get Number of Free Clusters                                           */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_getfree (
  	const TCHAR* path,	/* Logical drive number */
  	DWORD* nclst,		/* Pointer to a variable to return number of free clusters */
  	FATFS** fatfs		/* Pointer to return pointer to corresponding filesystem object */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  	DWORD nfree, clst, stat;
  	LBA_t sect;
  	UINT i;
  	FFOBJID obj;
  
  
  	/* Get logical drive */
  	res = mount_volume(&path, &fs, 0);
  	if (res == FR_OK) {
  		*fatfs = fs;				/* Return ptr to the fs object */
  		/* If free_clst is valid, return it without full FAT scan */
  		if (fs->free_clst <= fs->n_fatent - 2) {
  			*nclst = fs->free_clst;
  		} else {
  			/* Scan FAT to obtain number of free clusters */
  			nfree = 0;
  			if (fs->fs_type == FS_FAT12) {	/* FAT12: Scan bit field FAT entries */
  				clst = 2; obj.fs = fs;
  				do {
  					stat = get_fat(&obj, clst);
  					if (stat == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
  					if (stat == 1) { res = FR_INT_ERR; break; }
  					if (stat == 0) nfree++;
  				} while (++clst < fs->n_fatent);
  			} else {
  #if FF_FS_EXFAT
  				if (fs->fs_type == FS_EXFAT) {	/* exFAT: Scan allocation bitmap */
  					BYTE bm;
  					UINT b;
  
  					clst = fs->n_fatent - 2;	/* Number of clusters */
  					sect = fs->bitbase;			/* Bitmap sector */
  					i = 0;						/* Offset in the sector */
  					do {	/* Counts numbuer of bits with zero in the bitmap */
  						if (i == 0) {
  							res = move_window(fs, sect++);
  							if (res != FR_OK) break;
  						}
  						for (b = 8, bm = fs->win[i]; b && clst; b--, clst--) {
  							if (!(bm & 1)) nfree++;
  							bm >>= 1;
  						}
  						i = (i + 1) % SS(fs);
  					} while (clst);
  				} else
  #endif
  				{	/* FAT16/32: Scan WORD/DWORD FAT entries */
  					clst = fs->n_fatent;	/* Number of entries */
  					sect = fs->fatbase;		/* Top of the FAT */
  					i = 0;					/* Offset in the sector */
  					do {	/* Counts numbuer of entries with zero in the FAT */
  						if (i == 0) {
  							res = move_window(fs, sect++);
  							if (res != FR_OK) break;
  						}
  						if (fs->fs_type == FS_FAT16) {
  							if (ld_word(fs->win + i) == 0) nfree++;
  							i += 2;
  						} else {
  							if ((ld_dword(fs->win + i) & 0x0FFFFFFF) == 0) nfree++;
  							i += 4;
  						}
  						i %= SS(fs);
  					} while (--clst);
  				}
  			}
  			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;
  	FATFS *fs;
  	DWORD ncl;
  
  
  	res = validate(&fp->obj, &fs);	/* Check validity of the file object */
  	if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
  	if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */
  
  	if (fp->fptr < fp->obj.objsize) {	/* Process when fptr is not on the eof */
  		if (fp->fptr == 0) {	/* When set file size to zero, remove entire cluster chain */
  			res = remove_chain(&fp->obj, fp->obj.sclust, 0);
  			fp->obj.sclust = 0;
  		} else {				/* When truncate a part of the file, remove remaining clusters */
  			ncl = get_fat(&fp->obj, fp->clust);
  			res = FR_OK;
  			if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
  			if (ncl == 1) res = FR_INT_ERR;
  			if (res == FR_OK && ncl < fs->n_fatent) {
  				res = remove_chain(&fp->obj, ncl, fp->clust);
  			}
  		}
  		fp->obj.objsize = fp->fptr;	/* Set file size to current read/write point */
  		fp->flag |= FA_MODIFIED;
  #if !FF_FS_TINY
  		if (res == FR_OK && (fp->flag & FA_DIRTY)) {
  			if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
  				res = FR_DISK_ERR;
  			} else {
  				fp->flag &= (BYTE)~FA_DIRTY;
  			}
  		}
  #endif
  		if (res != FR_OK) ABORT(fs, res);
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Delete a File/Directory                                               */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_unlink (
  	const TCHAR* path		/* Pointer to the file or directory path */
  )
  {
  	FRESULT res;
  	DIR dj, sdj;
  	DWORD dclst = 0;
  	FATFS *fs;
  #if FF_FS_EXFAT
  	FFOBJID obj;
  #endif
  	DEF_NAMBUF
  
  
  	/* Get logical drive */
  	res = mount_volume(&path, &fs, FA_WRITE);
  	if (res == FR_OK) {
  		dj.obj.fs = fs;
  		INIT_NAMBUF(fs);
  		res = follow_path(&dj, path);		/* Follow the file path */
  		if (FF_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT)) {
  			res = FR_INVALID_NAME;			/* Cannot remove dot entry */
  		}
  #if FF_FS_LOCK != 0
  		if (res == FR_OK) res = chk_lock(&dj, 2);	/* Check if it is an open object */
  #endif
  		if (res == FR_OK) {					/* The object is accessible */
  			if (dj.fn[NSFLAG] & NS_NONAME) {
  				res = FR_INVALID_NAME;		/* Cannot remove the origin directory */
  			} else {
  				if (dj.obj.attr & AM_RDO) {
  					res = FR_DENIED;		/* Cannot remove R/O object */
  				}
  			}
  			if (res == FR_OK) {
  #if FF_FS_EXFAT
  				obj.fs = fs;
  				if (fs->fs_type == FS_EXFAT) {
  					init_alloc_info(fs, &obj);
  					dclst = obj.sclust;
  				} else
  #endif
  				{
  					dclst = ld_clust(fs, dj.dir);
  				}
  				if (dj.obj.attr & AM_DIR) {			/* Is it a sub-directory? */
  #if FF_FS_RPATH != 0
  					if (dclst == fs->cdir) {	 	/* Is it the current directory? */
  						res = FR_DENIED;
  					} else
  #endif
  					{
  						sdj.obj.fs = fs;			/* Open the sub-directory */
  						sdj.obj.sclust = dclst;
  #if FF_FS_EXFAT
  						if (fs->fs_type == FS_EXFAT) {
  							sdj.obj.objsize = obj.objsize;
  							sdj.obj.stat = obj.stat;
  						}
  #endif
  						res = dir_sdi(&sdj, 0);
  						if (res == FR_OK) {
  							res = DIR_READ_FILE(&sdj);			/* Test if the directory is empty */
  							if (res == FR_OK) res = FR_DENIED;	/* Not empty? */
  							if (res == FR_NO_FILE) res = FR_OK;	/* Empty? */
  						}
  					}
  				}
  			}
  			if (res == FR_OK) {
  				res = dir_remove(&dj);			/* Remove the directory entry */
  				if (res == FR_OK && dclst != 0) {	/* Remove the cluster chain if exist */
  #if FF_FS_EXFAT
  					res = remove_chain(&obj, dclst, 0);
  #else
  					res = remove_chain(&dj.obj, dclst, 0);
  #endif
  				}
  				if (res == FR_OK) res = sync_fs(fs);
  			}
  		}
  		FREE_NAMBUF();
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Create a Directory                                                    */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_mkdir (
  	const TCHAR* path		/* Pointer to the directory path */
  )
  {
  	FRESULT res;
  	DIR dj;
  	FFOBJID sobj;
  	FATFS *fs;
  	DWORD dcl, pcl, tm;
  	DEF_NAMBUF
  
  
  	res = mount_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
  	if (res == FR_OK) {
  		dj.obj.fs = fs;
  		INIT_NAMBUF(fs);
  		res = follow_path(&dj, path);			/* Follow the file path */
  		if (res == FR_OK) res = FR_EXIST;		/* Name collision? */
  		if (FF_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT)) {	/* Invalid name? */
  			res = FR_INVALID_NAME;
  		}
  		if (res == FR_NO_FILE) {				/* It is clear to create a new directory */
  			sobj.fs = fs;						/* New object id to create a new chain */
  			dcl = create_chain(&sobj, 0);		/* Allocate a cluster for the new directory */
  			res = FR_OK;
  			if (dcl == 0) res = FR_DENIED;		/* No space to allocate a new cluster? */
  			if (dcl == 1) res = FR_INT_ERR;		/* Any insanity? */
  			if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;	/* Disk error? */
  			tm = GET_FATTIME();
  			if (res == FR_OK) {
  				res = dir_clear(fs, dcl);		/* Clean up the new table */
  				if (res == FR_OK) {
  					if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {	/* Create dot entries (FAT only) */
  						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 directoy */
  				}
  			}
  			if (res == FR_OK) {
  #if FF_FS_EXFAT
  				if (fs->fs_type == FS_EXFAT) {	/* Initialize directory entry block */
  					st_dword(fs->dirbuf + XDIR_ModTime, tm);	/* Created time */
  					st_dword(fs->dirbuf + XDIR_FstClus, dcl);	/* Table start cluster */
  					st_dword(fs->dirbuf + XDIR_FileSize, (DWORD)fs->csize * SS(fs));	/* Directory size needs to be valid */
  					st_dword(fs->dirbuf + XDIR_ValidFileSize, (DWORD)fs->csize * SS(fs));
  					fs->dirbuf[XDIR_GenFlags] = 3;				/* Initialize the object flag */
  					fs->dirbuf[XDIR_Attr] = AM_DIR;				/* Attribute */
  					res = store_xdir(&dj);
  				} else
  #endif
  				{
  					st_dword(dj.dir + DIR_ModTime, tm);	/* Created time */
  					st_clust(fs, dj.dir, dcl);			/* Table start cluster */
  					dj.dir[DIR_Attr] = AM_DIR;			/* Attribute */
  					fs->wflag = 1;
  				}
  				if (res == FR_OK) {
  					res = sync_fs(fs);
  				}
  			} else {
  				remove_chain(&sobj, dcl, 0);		/* Could not register, remove the allocated cluster */
  			}
  		}
  		FREE_NAMBUF();
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Rename a File/Directory                                               */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_rename (
  	const TCHAR* path_old,	/* Pointer to the object name to be renamed */
  	const TCHAR* path_new	/* Pointer to the new name */
  )
  {
  	FRESULT res;
  	DIR djo, djn;
  	FATFS *fs;
  	BYTE buf[FF_FS_EXFAT ? SZDIRE * 2 : SZDIRE], *dir;
  	LBA_t sect;
  	DEF_NAMBUF
  
  
  	get_ldnumber(&path_new);						/* Snip the drive number of new name off */
  	res = mount_volume(&path_old, &fs, FA_WRITE);	/* Get logical drive of the old object */
  	if (res == FR_OK) {
  		djo.obj.fs = fs;
  		INIT_NAMBUF(fs);
  		res = follow_path(&djo, path_old);			/* Check old object */
  		if (res == FR_OK && (djo.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check validity of name */
  #if FF_FS_LOCK != 0
  		if (res == FR_OK) {
  			res = chk_lock(&djo, 2);
  		}
  #endif
  		if (res == FR_OK) {					/* Object to be renamed is found */
  #if FF_FS_EXFAT
  			if (fs->fs_type == FS_EXFAT) {	/* At exFAT volume */
  				BYTE nf, nn;
  				WORD nh;
  
  				memcpy(buf, fs->dirbuf, SZDIRE * 2);	/* Save 85+C0 entry of old object */
  				memcpy(&djn, &djo, sizeof djo);
  				res = follow_path(&djn, path_new);		/* Make sure if new object name is not in use */
  				if (res == FR_OK) {						/* Is new name already in use by any other object? */
  					res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
  				}
  				if (res == FR_NO_FILE) { 				/* It is a valid path and no name collision */
  					res = dir_register(&djn);			/* Register the new entry */
  					if (res == FR_OK) {
  						nf = fs->dirbuf[XDIR_NumSec]; nn = fs->dirbuf[XDIR_NumName];
  						nh = ld_word(fs->dirbuf + XDIR_NameHash);
  						memcpy(fs->dirbuf, buf, SZDIRE * 2);	/* Restore 85+C0 entry */
  						fs->dirbuf[XDIR_NumSec] = nf; fs->dirbuf[XDIR_NumName] = nn;
  						st_word(fs->dirbuf + XDIR_NameHash, nh);
  						if (!(fs->dirbuf[XDIR_Attr] & AM_DIR)) fs->dirbuf[XDIR_Attr] |= AM_ARC;	/* Set archive attribute if it is a file */
  /* Start of critical section where an interruption can cause a cross-link */
  						res = store_xdir(&djn);
  					}
  				}
  			} else
  #endif
  			{	/* At FAT/FAT32 volume */
  				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);
  }
  
  #endif /* !FF_FS_READONLY */
  #endif /* FF_FS_MINIMIZE == 0 */
  #endif /* FF_FS_MINIMIZE <= 1 */
  #endif /* FF_FS_MINIMIZE <= 2 */
  
  
  
  #if FF_USE_CHMOD && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Change Attribute                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_chmod (
  	const TCHAR* path,	/* Pointer to the file path */
  	BYTE attr,			/* Attribute bits */
  	BYTE mask			/* Attribute mask to change */
  )
  {
  	FRESULT res;
  	DIR dj;
  	FATFS *fs;
  	DEF_NAMBUF
  
  
  	res = mount_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
  	if (res == FR_OK) {
  		dj.obj.fs = fs;
  		INIT_NAMBUF(fs);
  		res = follow_path(&dj, path);	/* Follow the file path */
  		if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
  		if (res == FR_OK) {
  			mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;	/* Valid attribute mask */
  #if FF_FS_EXFAT
  			if (fs->fs_type == FS_EXFAT) {
  				fs->dirbuf[XDIR_Attr] = (attr & mask) | (fs->dirbuf[XDIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
  				res = store_xdir(&dj);
  			} else
  #endif
  			{
  				dj.dir[DIR_Attr] = (attr & mask) | (dj.dir[DIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
  				fs->wflag = 1;
  			}
  			if (res == FR_OK) {
  				res = sync_fs(fs);
  			}
  		}
  		FREE_NAMBUF();
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Change Timestamp                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_utime (
  	const TCHAR* path,	/* Pointer to the file/directory name */
  	const FILINFO* fno	/* Pointer to the timestamp to be set */
  )
  {
  	FRESULT res;
  	DIR dj;
  	FATFS *fs;
  	DEF_NAMBUF
  
  
  	res = mount_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
  	if (res == FR_OK) {
  		dj.obj.fs = fs;
  		INIT_NAMBUF(fs);
  		res = follow_path(&dj, path);	/* Follow the file path */
  		if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
  		if (res == FR_OK) {
  #if FF_FS_EXFAT
  			if (fs->fs_type == FS_EXFAT) {
  				st_dword(fs->dirbuf + XDIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
  				res = store_xdir(&dj);
  			} else
  #endif
  			{
  				st_dword(dj.dir + DIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
  				fs->wflag = 1;
  			}
  			if (res == FR_OK) {
  				res = sync_fs(fs);
  			}
  		}
  		FREE_NAMBUF();
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  #endif	/* FF_USE_CHMOD && !FF_FS_READONLY */
  
  
  
  #if FF_USE_LABEL
  /*-----------------------------------------------------------------------*/
  /* Get Volume Label                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_getlabel (
  	const TCHAR* path,	/* Logical drive number */
  	TCHAR* label,		/* Buffer to store the volume label */
  	DWORD* vsn			/* Variable to store the volume serial number */
  )
  {
  	FRESULT res;
  	DIR dj;
  	FATFS *fs;
  	UINT si, di;
  	WCHAR wc;
  
  	/* Get logical drive */
  	res = mount_volume(&path, &fs, 0);
  
  	/* Get volume label */
  	if (res == FR_OK && label) {
  		dj.obj.fs = fs; dj.obj.sclust = 0;	/* Open root directory */
  		res = dir_sdi(&dj, 0);
  		if (res == FR_OK) {
  		 	res = DIR_READ_LABEL(&dj);		/* Find a volume label entry */
  		 	if (res == FR_OK) {
  #if FF_FS_EXFAT
  				if (fs->fs_type == FS_EXFAT) {
  					WCHAR hs;
  					UINT nw;
  
  					for (si = di = hs = 0; si < dj.dir[XDIR_NumLabel]; si++) {	/* Extract volume label from 83 entry */
  						wc = ld_word(dj.dir + XDIR_Label + si * 2);
  						if (hs == 0 && IsSurrogate(wc)) {	/* Is the code a surrogate? */
  							hs = wc; continue;
  						}
  						nw = put_utf((DWORD)hs << 16 | wc, &label[di], 4);	/* Store it in API encoding */
  						if (nw == 0) { di = 0; break; }		/* Encode error? */
  						di += nw;
  						hs = 0;
  					}
  					if (hs != 0) di = 0;	/* Broken surrogate pair? */
  					label[di] = 0;
  				} else
  #endif
  				{
  					si = di = 0;		/* Extract volume label from AM_VOL entry */
  					while (si < 11) {
  						wc = dj.dir[si++];
  #if FF_USE_LFN && FF_LFN_UNICODE >= 1 	/* Unicode output */
  						if (dbc_1st((BYTE)wc) && si < 11) wc = wc << 8 | dj.dir[si++];	/* Is it a DBC? */
  						wc = ff_oem2uni(wc, CODEPAGE);		/* Convert it into Unicode */
  						if (wc == 0) { di = 0; break; }		/* Invalid char in current code page? */
  						di += put_utf(wc, &label[di], 4);	/* Store it in Unicode */
  #else									/* ANSI/OEM output */
  						label[di++] = (TCHAR)wc;
  #endif
  					}
  					do {				/* Truncate trailing spaces */
  						label[di] = 0;
  						if (di == 0) break;
  					} while (label[--di] == ' ');
  				}
  			}
  		}
  		if (res == FR_NO_FILE) {	/* No label entry and return nul string */
  			label[0] = 0;
  			res = FR_OK;
  		}
  	}
  
  	/* Get volume serial number */
  	if (res == FR_OK && vsn) {
  		res = move_window(fs, fs->volbase);
  		if (res == FR_OK) {
  			switch (fs->fs_type) {
  			case FS_EXFAT:
  				di = BPB_VolIDEx;
  				break;
  
  			case FS_FAT32:
  				di = BS_VolID32;
  				break;
  
  			default:
  				di = BS_VolID;
  			}
  			*vsn = ld_dword(fs->win + di);
  		}
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  
  
  #if !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Set Volume Label                                                      */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_setlabel (
  	const TCHAR* label	/* Volume label to set with heading logical drive number */
  )
  {
  	FRESULT res;
  	DIR dj;
  	FATFS *fs;
  	BYTE dirvn[22];
  	UINT di;
  	WCHAR wc;
  	static const char badchr[18] = "+.,;=[]" "/*:<>|\\\"\?\x7F";	/* [0..16] for FAT, [7..16] for exFAT */
  #if FF_USE_LFN
  	DWORD dc;
  #endif
  
  	/* Get logical drive */
  	res = mount_volume(&label, &fs, FA_WRITE);
  	if (res != FR_OK) LEAVE_FF(fs, res);
  
  #if FF_FS_EXFAT
  	if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
  		memset(dirvn, 0, 22);
  		di = 0;
  		while ((UINT)*label >= ' ') {	/* Create volume label */
  			dc = tchar2uni(&label);	/* Get a Unicode character */
  			if (dc >= 0x10000) {
  				if (dc == 0xFFFFFFFF || di >= 10) {	/* Wrong surrogate or buffer overflow */
  					dc = 0;
  				} else {
  					st_word(dirvn + di * 2, (WCHAR)(dc >> 16)); di++;
  				}
  			}
  			if (dc == 0 || strchr(&badchr[7], (int)dc) || di >= 11) {	/* Check validity of the volume label */
  				LEAVE_FF(fs, FR_INVALID_NAME);
  			}
  			st_word(dirvn + di * 2, (WCHAR)dc); di++;
  		}
  	} else
  #endif
  	{	/* On the FAT/FAT32 volume */
  		memset(dirvn, ' ', 11);
  		di = 0;
  		while ((UINT)*label >= ' ') {	/* Create volume label */
  #if FF_USE_LFN
  			dc = tchar2uni(&label);
  			wc = (dc < 0x10000) ? ff_uni2oem(ff_wtoupper(dc), CODEPAGE) : 0;
  #else									/* ANSI/OEM input */
  			wc = (BYTE)*label++;
  			if (dbc_1st((BYTE)wc)) wc = dbc_2nd((BYTE)*label) ? wc << 8 | (BYTE)*label++ : 0;
  			if (IsLower(wc)) wc -= 0x20;		/* To upper ASCII characters */
  #if FF_CODE_PAGE == 0
  			if (ExCvt && wc >= 0x80) wc = ExCvt[wc - 0x80];	/* To upper extended characters (SBCS cfg) */
  #elif FF_CODE_PAGE < 900
  			if (wc >= 0x80) wc = ExCvt[wc - 0x80];	/* To upper extended characters (SBCS cfg) */
  #endif
  #endif
  			if (wc == 0 || 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);
  }
  
  #endif /* !FF_FS_READONLY */
  #endif /* FF_USE_LABEL */
  
  
  
  #if FF_USE_EXPAND && !FF_FS_READONLY
  /*-----------------------------------------------------------------------*/
  /* Allocate a Contiguous Blocks to the File                              */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_expand (
  	FIL* fp,		/* Pointer to the file object */
  	FSIZE_t fsz,	/* File size to be expanded to */
  	BYTE opt		/* Operation mode 0:Find and prepare or 1:Find and allocate */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  	DWORD n, clst, stcl, scl, ncl, tcl, lclst;
  
  
  	res = validate(&fp->obj, &fs);		/* Check validity of the file object */
  	if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
  	if (fsz == 0 || fp->obj.objsize != 0 || !(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);
  #if FF_FS_EXFAT
  	if (fs->fs_type != FS_EXFAT && fsz >= 0x100000000) LEAVE_FF(fs, FR_DENIED);	/* Check if in size limit */
  #endif
  	n = (DWORD)fs->csize * SS(fs);	/* Cluster size */
  	tcl = (DWORD)(fsz / n) + ((fsz & (n - 1)) ? 1 : 0);	/* Number of clusters required */
  	stcl = fs->last_clst; lclst = 0;
  	if (stcl < 2 || stcl >= fs->n_fatent) stcl = 2;
  
  #if FF_FS_EXFAT
  	if (fs->fs_type == FS_EXFAT) {
  		scl = find_bitmap(fs, stcl, tcl);			/* Find a contiguous cluster block */
  		if (scl == 0) res = FR_DENIED;				/* No contiguous cluster block was found */
  		if (scl == 0xFFFFFFFF) res = FR_DISK_ERR;
  		if (res == FR_OK) {	/* A contiguous free area is found */
  			if (opt) {		/* Allocate it now */
  				res = change_bitmap(fs, scl, tcl, 1);	/* Mark the cluster block 'in use' */
  				lclst = scl + tcl - 1;
  			} else {		/* Set it as suggested point for next allocation */
  				lclst = scl - 1;
  			}
  		}
  	} else
  #endif
  	{
  		scl = clst = stcl; ncl = 0;
  		for (;;) {	/* Find a contiguous cluster block */
  			n = get_fat(&fp->obj, clst);
  			if (++clst >= fs->n_fatent) clst = 2;
  			if (n == 1) { res = FR_INT_ERR; break; }
  			if (n == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
  			if (n == 0) {	/* Is it a free cluster? */
  				if (++ncl == tcl) break;	/* Break if a contiguous cluster block is found */
  			} else {
  				scl = clst; ncl = 0;		/* Not a free cluster */
  			}
  			if (clst == stcl) { res = FR_DENIED; break; }	/* No contiguous cluster? */
  		}
  		if (res == FR_OK) {	/* A contiguous free area is found */
  			if (opt) {		/* Allocate it now */
  				for (clst = scl, n = tcl; n; clst++, n--) {	/* Create a cluster chain on the FAT */
  					res = put_fat(fs, clst, (n == 1) ? 0xFFFFFFFF : clst + 1);
  					if (res != FR_OK) break;
  					lclst = clst;
  				}
  			} else {		/* Set it as suggested point for next allocation */
  				lclst = scl - 1;
  			}
  		}
  	}
  
  	if (res == FR_OK) {
  		fs->last_clst = lclst;		/* Set suggested start cluster to start next */
  		if (opt) {	/* Is it allocated now? */
  			fp->obj.sclust = scl;		/* Update object allocation information */
  			fp->obj.objsize = fsz;
  			if (FF_FS_EXFAT) fp->obj.stat = 2;	/* Set status 'contiguous chain' */
  			fp->flag |= FA_MODIFIED;
  			if (fs->free_clst <= fs->n_fatent - 2) {	/* Update FSINFO */
  				fs->free_clst -= tcl;
  				fs->fsi_flag |= 1;
  			}
  		}
  	}
  
  	LEAVE_FF(fs, res);
  }
  
  #endif /* FF_USE_EXPAND && !FF_FS_READONLY */
  
  
  
  #if FF_USE_FORWARD
  /*-----------------------------------------------------------------------*/
  /* Forward Data to the Stream Directly                                   */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_forward (
  	FIL* fp, 						/* Pointer to the file object */
  	UINT (*func)(const BYTE*,UINT),	/* Pointer to the streaming function */
  	UINT btf,						/* Number of bytes to forward */
  	UINT* bf						/* Pointer to number of bytes forwarded */
  )
  {
  	FRESULT res;
  	FATFS *fs;
  	DWORD clst;
  	LBA_t sect;
  	FSIZE_t remain;
  	UINT rcnt, csect;
  	BYTE *dbuf;
  
  
  	*bf = 0;	/* Clear transfer byte counter */
  	res = validate(&fp->obj, &fs);		/* Check validity of the file object */
  	if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
  	if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */
  
  	remain = fp->obj.objsize - fp->fptr;
  	if (btf > remain) btf = (UINT)remain;			/* Truncate btf by remaining bytes */
  
  	for ( ; btf > 0 && (*func)(0, 0); fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {	/* Repeat until all data transferred or stream goes busy */
  		csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));	/* Sector offset in the cluster */
  		if (fp->fptr % SS(fs) == 0) {				/* On the sector boundary? */
  			if (csect == 0) {						/* On the cluster boundary? */
  				clst = (fp->fptr == 0) ?			/* On the top of the file? */
  					fp->obj.sclust : get_fat(&fp->obj, fp->clust);
  				if (clst <= 1) ABORT(fs, FR_INT_ERR);
  				if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
  				fp->clust = clst;					/* Update current cluster */
  			}
  		}
  		sect = clst2sect(fs, fp->clust);			/* Get current data sector */
  		if (sect == 0) ABORT(fs, FR_INT_ERR);
  		sect += csect;
  #if FF_FS_TINY
  		if (move_window(fs, sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window to the file data */
  		dbuf = fs->win;
  #else
  		if (fp->sect != sect) {		/* Fill sector cache with file data */
  #if !FF_FS_READONLY
  			if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
  				if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
  				fp->flag &= (BYTE)~FA_DIRTY;
  			}
  #endif
  			if (disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
  		}
  		dbuf = fp->buf;
  #endif
  		fp->sect = sect;
  		rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes remains in the sector */
  		if (rcnt > btf) rcnt = btf;					/* Clip it by btr if needed */
  		rcnt = (*func)(dbuf + ((UINT)fp->fptr % SS(fs)), rcnt);	/* Forward the file data */
  		if (rcnt == 0) ABORT(fs, FR_INT_ERR);
  	}
  
  	LEAVE_FF(fs, FR_OK);
  }
  #endif /* FF_USE_FORWARD */
  
  
  
  #if !FF_FS_READONLY && FF_USE_MKFS
  /*-----------------------------------------------------------------------*/
  /* Create FAT/exFAT volume (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 only MBR, temp setting) */
  	BYTE* buf			/* Working buffer for a sector */
  )
  {
  	UINT i, cy;
  	LBA_t sz_drv;
  	DWORD sz_drv32, nxt_alloc32, sz_part32;
  	BYTE *pte;
  	BYTE hd, n_hd, sc, n_sc;
  
  	/* Get physical drive size */
  	if (disk_ioctl(drv, GET_SECTOR_COUNT, &sz_drv) != RES_OK) return FR_DISK_ERR;
  
  #if FF_LBA64
  	if (sz_drv >= FF_MIN_GPT) {	/* Create partitions in GPT format */
  		WORD ss;
  		UINT sz_ptbl, pi, si, ofs;
  		DWORD bcc, rnd, align;
  		QWORD nxt_alloc, sz_part, sz_pool, top_bpt;
  		static const BYTE gpt_mbr[16] = {0x00, 0x00, 0x02, 0x00, 0xEE, 0xFE, 0xFF, 0x00, 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF};
  
  #if FF_MAX_SS != FF_MIN_SS
  		if (disk_ioctl(drv, GET_SECTOR_SIZE, &ss) != RES_OK) return FR_DISK_ERR;	/* Get sector size */
  		if (ss > FF_MAX_SS || ss < FF_MIN_SS || (ss & (ss - 1))) return FR_DISK_ERR;
  #else
  		ss = FF_MAX_SS;
  #endif
  		rnd = (DWORD)sz_drv + GET_FATTIME();	/* Random seed */
  		align = GPT_ALIGN / ss;				/* Partition alignment for GPT [sector] */
  		sz_ptbl = GPT_ITEMS * SZ_GPTE / ss;	/* Size of partition table [sector] */
  		top_bpt = sz_drv - sz_ptbl - 1;		/* Backup partiiton table start sector */
  		nxt_alloc = 2 + sz_ptbl;			/* First allocatable sector */
  		sz_pool = top_bpt - nxt_alloc;		/* Size of allocatable area */
  		bcc = 0xFFFFFFFF; sz_part = 1;
  		pi = si = 0;	/* partition table index, size table index */
  		do {
  			if (pi * SZ_GPTE % ss == 0) memset(buf, 0, ss);	/* Clean the buffer if needed */
  			if (sz_part != 0) {				/* Is the size table not termintated? */
  				nxt_alloc = (nxt_alloc + align - 1) & ((QWORD)0 - align);	/* Align partition start */
  				sz_part = plst[si++];		/* Get a partition size */
  				if (sz_part <= 100) {		/* Is the size in percentage? */
  					sz_part = sz_pool * sz_part / 100;
  					sz_part = (sz_part + align - 1) & ((QWORD)0 - align);	/* Align partition end (only if in percentage) */
  				}
  				if (nxt_alloc + sz_part > top_bpt) {	/* Clip the size at end of the pool */
  					sz_part = (nxt_alloc < top_bpt) ? top_bpt - nxt_alloc : 0;
  				}
  			}
  			if (sz_part != 0) {				/* Add a partition? */
  				ofs = pi * SZ_GPTE % ss;
  				memcpy(buf + ofs + GPTE_PtGuid, GUID_MS_Basic, 16);	/* Set partition GUID (Microsoft Basic Data) */
  				rnd = make_rand(rnd, buf + ofs + GPTE_UpGuid, 16);	/* Set unique partition GUID */
  				st_qword(buf + ofs + GPTE_FstLba, nxt_alloc);		/* Set partition start sector */
  				st_qword(buf + ofs + GPTE_LstLba, nxt_alloc + sz_part - 1);	/* Set partition end sector */
  				nxt_alloc += sz_part;								/* Next allocatable sector */
  			}
  			if ((pi + 1) * SZ_GPTE % ss == 0) {		/* Write the buffer if it is filled up */
  				for (i = 0; i < ss; bcc = crc32(bcc, buf[i++])) ;	/* Calculate table check sum */
  				if (disk_write(drv, buf, 2 + pi * SZ_GPTE / ss, 1) != RES_OK) return FR_DISK_ERR;		/* Write to primary table */
  				if (disk_write(drv, buf, top_bpt + pi * SZ_GPTE / ss, 1) != RES_OK) return FR_DISK_ERR;	/* Write to secondary table */
  			}
  		} while (++pi < GPT_ITEMS);
  
  		/* Create primary GPT header */
  		memset(buf, 0, ss);
  		memcpy(buf + GPTH_Sign, "EFI PART" "\0\0\1\0" "\x5C\0\0", 16);	/* Signature, version (1.0) and size (92) */
  		st_dword(buf + GPTH_PtBcc, ~bcc);			/* Table check sum */
  		st_qword(buf + GPTH_CurLba, 1);				/* LBA of this header */
  		st_qword(buf + GPTH_BakLba, sz_drv - 1);	/* LBA of secondary header */
  		st_qword(buf + GPTH_FstLba, 2 + sz_ptbl);	/* LBA of first allocatable sector */
  		st_qword(buf + GPTH_LstLba, top_bpt - 1);	/* LBA of last allocatable sector */
  		st_dword(buf + GPTH_PteSize, SZ_GPTE);		/* Size of a table entry */
  		st_dword(buf + GPTH_PtNum, GPT_ITEMS);		/* Number of table entries */
  		st_dword(buf + GPTH_PtOfs, 2);				/* LBA of this table */
  		rnd = make_rand(rnd, buf + GPTH_DskGuid, 16);	/* Disk GUID */
  		for (i = 0, bcc= 0xFFFFFFFF; i < 92; bcc = crc32(bcc, buf[i++])) ;	/* Calculate header check sum */
  		st_dword(buf + GPTH_Bcc, ~bcc);				/* Header check sum */
  		if (disk_write(drv, buf, 1, 1) != RES_OK) return FR_DISK_ERR;
  
  		/* Create secondary GPT header */
  		st_qword(buf + GPTH_CurLba, sz_drv - 1);	/* LBA of this header */
  		st_qword(buf + GPTH_BakLba, 1);				/* LBA of primary header */
  		st_qword(buf + GPTH_PtOfs, top_bpt);		/* LBA of this table */
  		st_dword(buf + GPTH_Bcc, 0);
  		for (i = 0, bcc= 0xFFFFFFFF; i < 92; bcc = crc32(bcc, buf[i++])) ;	/* Calculate header check sum */
  		st_dword(buf + GPTH_Bcc, ~bcc);				/* Header check sum */
  		if (disk_write(drv, buf, sz_drv - 1, 1) != RES_OK) return FR_DISK_ERR;
  
  		/* Create protective MBR */
  		memset(buf, 0, ss);
  		memcpy(buf + MBR_Table, gpt_mbr, 16);		/* Create a GPT partition */
  		st_word(buf + BS_55AA, 0xAA55);
  		if (disk_write(drv, buf, 0, 1) != RES_OK) return FR_DISK_ERR;
  
  	} else
  #endif
  	{	/* Create partitions in MBR 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 heap memory) */
  	UINT len				/* Size of working buffer [byte] */
  )
  {
  	static const WORD cst[] = {1, 4, 16, 64, 256, 512, 0};	/* Cluster size boundary for FAT volume (4Ks unit) */
  	static const WORD cst32[] = {1, 2, 4, 8, 16, 32, 0};	/* Cluster size boundary for FAT32 volume (128Ks unit) */
  	static const MKFS_PARM defopt = {FM_ANY, 0, 0, 0, 0};	/* Default parameter */
  	BYTE fsopt, fsty, sys, *buf, *pte, pdrv, ipart;
  	WORD ss;	/* Sector size */
  	DWORD sz_buf, sz_blk, n_clst, pau, nsect, n, vsn;
  	LBA_t sz_vol, b_vol, b_fat, b_data;		/* Size of volume, Base LBA of volume, fat, data */
  	LBA_t sect, lba[2];
  	DWORD sz_rsv, sz_fat, sz_dir, sz_au;	/* Size of reserved, fat, dir, data, cluster */
  	UINT n_fat, n_root, i;					/* Index, Number of FATs and Number of roor dir entries */
  	int vol;
  	DSTATUS ds;
  	FRESULT fr;
  
  
  	/* Check mounted drive and clear work area */
  	vol = get_ldnumber(&path);					/* Get target logical drive */
  	if (vol < 0) return FR_INVALID_DRIVE;
  	if (FatFs[vol]) FatFs[vol]->fs_type = 0;	/* Clear the fs object if mounted */
  	pdrv = LD2PD(vol);			/* Physical drive */
  	ipart = LD2PT(vol);			/* Partition (0:create as new, 1..:get from partition table) */
  	if (!opt) opt = &defopt;	/* Use default parameter if it is not given */
  
  	/* Get physical drive status (sz_drv, sz_blk, ss) */
  	ds = disk_initialize(pdrv);
  	if (ds & STA_NOINIT) return FR_NOT_READY;
  	if (ds & STA_PROTECT) return FR_WRITE_PROTECTED;
  	sz_blk = opt->align;
  	if (sz_blk == 0 && disk_ioctl(pdrv, GET_BLOCK_SIZE, &sz_blk) != RES_OK) sz_blk = 1;
   	if (sz_blk == 0 || sz_blk > 0x8000 || (sz_blk & (sz_blk - 1))) sz_blk = 1;
  #if FF_MAX_SS != FF_MIN_SS
  	if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &ss) != RES_OK) return FR_DISK_ERR;
  	if (ss > FF_MAX_SS || ss < FF_MIN_SS || (ss & (ss - 1))) return FR_DISK_ERR;
  #else
  	ss = FF_MAX_SS;
  #endif
  	/* Options for FAT sub-type and FAT parameters */
  	fsopt = opt->fmt & (FM_ANY | FM_SFD);
  	n_fat = (opt->n_fat >= 1 && opt->n_fat <= 2) ? opt->n_fat : 1;
  	n_root = (opt->n_root >= 1 && opt->n_root <= 32768 && (opt->n_root % (ss / SZDIRE)) == 0) ? opt->n_root : 512;
  	sz_au = (opt->au_size <= 0x1000000 && (opt->au_size & (opt->au_size - 1)) == 0) ? opt->au_size : 0;
  	sz_au /= ss;	/* Byte --> Sector */
  
  	/* Get working buffer */
  	sz_buf = len / ss;		/* Size of working buffer [sector] */
  	if (sz_buf == 0) return FR_NOT_ENOUGH_CORE;
  	buf = (BYTE*)work;		/* Working buffer */
  #if FF_USE_LFN == 3
  	if (!buf) buf = ff_memalloc(sz_buf * ss);	/* Use heap memory for working buffer */
  #endif
  	if (!buf) return FR_NOT_ENOUGH_CORE;
  
  	/* Determine where the volume to be located (b_vol, sz_vol) */
  	b_vol = sz_vol = 0;
  	if (FF_MULTI_PARTITION && ipart != 0) {	/* Is the volume associated with any specific partition? */
  		/* Get partition location from the existing partition table */
  		if (disk_read(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Load MBR */
  		if (ld_word(buf + BS_55AA) != 0xAA55) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if MBR is valid */
  #if FF_LBA64
  		if (buf[MBR_Table + PTE_System] == 0xEE) {	/* GPT protective MBR? */
  			DWORD n_ent, ofs;
  			QWORD pt_lba;
  
  			/* Get the partition location from GPT */
  			if (disk_read(pdrv, buf, 1, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Load GPT header sector (next to MBR) */
  			if (!test_gpt_header(buf)) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if GPT header is valid */
  			n_ent = ld_dword(buf + GPTH_PtNum);		/* Number of entries */
  			pt_lba = ld_qword(buf + GPTH_PtOfs);	/* Table start sector */
  			ofs = i = 0;
  			while (n_ent) {		/* Find MS Basic partition with order of ipart */
  				if (ofs == 0 && disk_read(pdrv, buf, pt_lba++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Get PT sector */
  				if (!memcmp(buf + ofs + GPTE_PtGuid, GUID_MS_Basic, 16) && ++i == ipart) {	/* MS basic data partition? */
  					b_vol = ld_qword(buf + ofs + GPTE_FstLba);
  					sz_vol = ld_qword(buf + ofs + GPTE_LstLba) - b_vol + 1;
  					break;
  				}
  				n_ent--; ofs = (ofs + SZ_GPTE) % ss;	/* Next entry */
  			}
  			if (n_ent == 0) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Partition not found */
  			fsopt |= 0x80;	/* Partitioning is in GPT */
  		} else
  #endif
  		{	/* Get the partition location from MBR partition table */
  			pte = buf + (MBR_Table + (ipart - 1) * SZ_PTE);
  			if (ipart > 4 || pte[PTE_System] == 0) LEAVE_MKFS(FR_MKFS_ABORTED);	/* No partition? */
  			b_vol = ld_dword(pte + PTE_StLba);		/* Get volume start sector */
  			sz_vol = ld_dword(pte + PTE_SizLba);	/* Get volume size */
  		}
  	} else {	/* The volume is associated with a physical drive */
  		if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_vol) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  		if (!(fsopt & FM_SFD)) {	/* To be partitioned? */
  			/* Create a single-partition on the drive in this function */
  #if FF_LBA64
  			if (sz_vol >= FF_MIN_GPT) {	/* Which partition type to create, MBR or GPT? */
  				fsopt |= 0x80;		/* Partitioning is in GPT */
  				b_vol = GPT_ALIGN / ss; sz_vol -= b_vol + GPT_ITEMS * SZ_GPTE / ss + 1;	/* Estimated partition offset and size */
  			} else
  #endif
  			{	/* Partitioning is in MBR */
  				if (sz_vol > N_SEC_TRACK) {
  					b_vol = N_SEC_TRACK; sz_vol -= b_vol;	/* Estimated partition offset and size */
  				}
  			}
  		}
  	}
  	if (sz_vol < 128) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Check if volume size is >=128s */
  
  	/* Now start to create 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 FF_LBA64
  		if (sz_vol >= 0x100000000) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too large volume for FAT/FAT32 */
  #endif
  		if (sz_au > 128) sz_au = 128;	/* Invalid AU for FAT/FAT32? */
  		if (fsopt & FM_FAT32) {	/* FAT32 possible? */
  			if (!(fsopt & FM_FAT)) {	/* no-FAT? */
  				fsty = FS_FAT32; break;
  			}
  		}
  		if (!(fsopt & FM_FAT)) LEAVE_MKFS(FR_INVALID_PARAMETER);	/* no-FAT? */
  		fsty = FS_FAT16;
  	} while (0);
  
  	vsn = (DWORD)sz_vol + GET_FATTIME();	/* VSN generated from current time and partitiion size */
  
  #if FF_FS_EXFAT
  	if (fsty == FS_EXFAT) {	/* Create an exFAT volume */
  		DWORD szb_bit, szb_case, sum, nbit, clu, clen[3];
  		WCHAR ch, si;
  		UINT j, st;
  
  		if (sz_vol < 0x1000) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume for exFAT? */
  #if FF_USE_TRIM
  		lba[0] = b_vol; lba[1] = b_vol + sz_vol - 1;	/* Inform storage device that the volume area may be erased */
  		disk_ioctl(pdrv, CTRL_TRIM, lba);
  #endif
  		/* Determine FAT location, data location and number of clusters */
  		if (sz_au == 0) {	/* AU auto-selection */
  			sz_au = 8;
  			if (sz_vol >= 0x80000) sz_au = 64;		/* >= 512Ks */
  			if (sz_vol >= 0x4000000) sz_au = 256;	/* >= 64Ms */
  		}
  		b_fat = b_vol + 32;										/* FAT start at offset 32 */
  		sz_fat = (DWORD)((sz_vol / sz_au + 2) * 4 + ss - 1) / ss;	/* Number of FAT sectors */
  		b_data = (b_fat + sz_fat + sz_blk - 1) & ~((LBA_t)sz_blk - 1);	/* Align data area to the erase block boundary */
  		if (b_data - b_vol >= sz_vol / 2) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume? */
  		n_clst = (DWORD)(sz_vol - (b_data - b_vol)) / sz_au;	/* Number of clusters */
  		if (n_clst <16) LEAVE_MKFS(FR_MKFS_ABORTED);			/* Too few clusters? */
  		if (n_clst > MAX_EXFAT) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too many clusters? */
  
  		szb_bit = (n_clst + 7) / 8;								/* Size of allocation bitmap */
  		clen[0] = (szb_bit + sz_au * ss - 1) / (sz_au * ss);	/* Number of allocation bitmap clusters */
  
  		/* Create a compressed up-case table */
  		sect = b_data + sz_au * clen[0];	/* Table start sector */
  		sum = 0;							/* Table checksum to be stored in the 82 entry */
  		st = 0; si = 0; i = 0; j = 0; szb_case = 0;
  		do {
  			switch (st) {
  			case 0:
  				ch = (WCHAR)ff_wtoupper(si);	/* Get an up-case char */
  				if (ch != si) {
  					si++; break;		/* Store the up-case char if exist */
  				}
  				for (j = 1; (WCHAR)(si + j) && (WCHAR)(si + j) == ff_wtoupper((WCHAR)(si + j)); j++) ;	/* Get run length of no-case block */
  				if (j >= 128) {
  					ch = 0xFFFF; st = 2; break;	/* Compress the no-case block if run is >= 128 chars */
  				}
  				st = 1;			/* Do not compress short run */
  				/* FALLTHROUGH */
  			case 1:
  				ch = si++;		/* Fill the short run */
  				if (--j == 0) st = 0;
  				break;
  
  			default:
  				ch = (WCHAR)j; si += (WCHAR)j;	/* Number of chars to skip */
  				st = 0;
  			}
  			sum = xsum32(buf[i + 0] = (BYTE)ch, sum);	/* Put it into the write buffer */
  			sum = xsum32(buf[i + 1] = (BYTE)(ch >> 8), sum);
  			i += 2; szb_case += 2;
  			if (si == 0 || i == sz_buf * ss) {		/* Write buffered data when buffer full or end of process */
  				n = (i + ss - 1) / ss;
  				if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  				sect += n; i = 0;
  			}
  		} while (si);
  		clen[1] = (szb_case + sz_au * ss - 1) / (sz_au * ss);	/* Number of up-case table clusters */
  		clen[2] = 1;	/* Number of root dir clusters */
  
  		/* Initialize the allocation bitmap */
  		sect = b_data; nsect = (szb_bit + ss - 1) / ss;	/* Start of bitmap and number of bitmap sectors */
  		nbit = clen[0] + clen[1] + clen[2];				/* Number of clusters in-use by system (bitmap, up-case and root-dir) */
  		do {
  			memset(buf, 0, sz_buf * ss);				/* Initialize bitmap buffer */
  			for (i = 0; nbit != 0 && i / 8 < sz_buf * ss; buf[i / 8] |= 1 << (i % 8), i++, nbit--) ;	/* Mark used clusters */
  			n = (nsect > sz_buf) ? sz_buf : nsect;		/* Write the buffered data */
  			if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  			sect += n; nsect -= n;
  		} while (nsect);
  
  		/* Initialize the FAT */
  		sect = b_fat; nsect = sz_fat;	/* Start of FAT and number of FAT sectors */
  		j = nbit = clu = 0;
  		do {
  			memset(buf, 0, sz_buf * ss); i = 0;	/* Clear work area and reset write offset */
  			if (clu == 0) {	/* Initialize FAT [0] and FAT[1] */
  				st_dword(buf + i, 0xFFFFFFF8); i += 4; clu++;
  				st_dword(buf + i, 0xFFFFFFFF); i += 4; clu++;
  			}
  			do {			/* Create chains of bitmap, up-case and root dir */
  				while (nbit != 0 && i < sz_buf * ss) {	/* Create a chain */
  					st_dword(buf + i, (nbit > 1) ? clu + 1 : 0xFFFFFFFF);
  					i += 4; clu++; nbit--;
  				}
  				if (nbit == 0 && j < 3) nbit = clen[j++];	/* Get next chain length */
  			} while (nbit != 0 && i < sz_buf * ss);
  			n = (nsect > sz_buf) ? sz_buf : nsect;	/* Write the buffered data */
  			if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  			sect += n; nsect -= n;
  		} while (nsect);
  
  		/* Initialize the root directory */
  		memset(buf, 0, sz_buf * ss);
  		buf[SZDIRE * 0 + 0] = ET_VLABEL;				/* Volume label entry (no label) */
  		buf[SZDIRE * 1 + 0] = ET_BITMAP;				/* Bitmap entry */
  		st_dword(buf + SZDIRE * 1 + 20, 2);				/*  cluster */
  		st_dword(buf + SZDIRE * 1 + 24, szb_bit);		/*  size */
  		buf[SZDIRE * 2 + 0] = ET_UPCASE;				/* Up-case table entry */
  		st_dword(buf + SZDIRE * 2 + 4, sum);			/*  sum */
  		st_dword(buf + SZDIRE * 2 + 20, 2 + clen[0]);	/*  cluster */
  		st_dword(buf + SZDIRE * 2 + 24, szb_case);		/*  size */
  		sect = b_data + sz_au * (clen[0] + clen[1]); nsect = sz_au;	/* Start of the root directory and number of sectors */
  		do {	/* Fill root directory sectors */
  			n = (nsect > sz_buf) ? sz_buf : nsect;
  			if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  			memset(buf, 0, ss);	/* Rest of entries are filled with zero */
  			sect += n; nsect -= n;
  		} while (nsect);
  
  		/* Create two set of the exFAT VBR blocks */
  		sect = b_vol;
  		for (n = 0; n < 2; n++) {
  			/* Main record (+0) */
  			memset(buf, 0, ss);
  			memcpy(buf + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11);	/* Boot jump code (x86), OEM name */
  			st_qword(buf + BPB_VolOfsEx, b_vol);					/* Volume offset in the physical drive [sector] */
  			st_qword(buf + BPB_TotSecEx, sz_vol);					/* Volume size [sector] */
  			st_dword(buf + BPB_FatOfsEx, (DWORD)(b_fat - b_vol));	/* FAT offset [sector] */
  			st_dword(buf + BPB_FatSzEx, sz_fat);					/* FAT size [sector] */
  			st_dword(buf + BPB_DataOfsEx, (DWORD)(b_data - b_vol));	/* Data offset [sector] */
  			st_dword(buf + BPB_NumClusEx, n_clst);					/* Number of clusters */
  			st_dword(buf + BPB_RootClusEx, 2 + clen[0] + clen[1]);	/* Root dir cluster # */
  			st_dword(buf + BPB_VolIDEx, vsn);						/* VSN */
  			st_word(buf + BPB_FSVerEx, 0x100);						/* Filesystem version (1.00) */
  			for (buf[BPB_BytsPerSecEx] = 0, i = ss; i >>= 1; buf[BPB_BytsPerSecEx]++) ;	/* Log2 of sector size [byte] */
  			for (buf[BPB_SecPerClusEx] = 0, i = sz_au; i >>= 1; buf[BPB_SecPerClusEx]++) ;	/* Log2 of cluster size [sector] */
  			buf[BPB_NumFATsEx] = 1;					/* Number of FATs */
  			buf[BPB_DrvNumEx] = 0x80;				/* Drive number (for int13) */
  			st_word(buf + BS_BootCodeEx, 0xFEEB);	/* Boot code (x86) */
  			st_word(buf + BS_55AA, 0xAA55);			/* Signature (placed here regardless of sector size) */
  			for (i = sum = 0; i < ss; i++) {		/* VBR checksum */
  				if (i != BPB_VolFlagEx && i != BPB_VolFlagEx + 1 && i != BPB_PercInUseEx) sum = xsum32(buf[i], sum);
  			}
  			if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  			/* Extended bootstrap record (+1..+8) */
  			memset(buf, 0, ss);
  			st_word(buf + ss - 2, 0xAA55);	/* Signature (placed at end of sector) */
  			for (j = 1; j < 9; j++) {
  				for (i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;	/* VBR checksum */
  				if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  			}
  			/* OEM/Reserved record (+9..+10) */
  			memset(buf, 0, ss);
  			for ( ; j < 11; j++) {
  				for (i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;	/* VBR checksum */
  				if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  			}
  			/* Sum record (+11) */
  			for (i = 0; i < ss; i += 4) st_dword(buf + i, sum);		/* Fill with checksum value */
  			if (disk_write(pdrv, buf, sect++, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  		}
  
  	} else
  #endif	/* FF_FS_EXFAT */
  	{	/* Create an FAT/FAT32 volume */
  		do {
  			pau = sz_au;
  			/* Pre-determine number of clusters and FAT sub-type */
  			if (fsty == FS_FAT32) {	/* FAT32 volume */
  				if (pau == 0) {	/* AU auto-selection */
  					n = (DWORD)sz_vol / 0x20000;	/* Volume size in unit of 128KS */
  					for (i = 0, pau = 1; cst32[i] && cst32[i] <= n; i++, pau <<= 1) ;	/* Get from table */
  				}
  				n_clst = (DWORD)sz_vol / pau;	/* Number of clusters */
  				sz_fat = (n_clst * 4 + 8 + ss - 1) / ss;	/* FAT size [sector] */
  				sz_rsv = 32;	/* Number of reserved sectors */
  				sz_dir = 0;		/* No static directory */
  				if (n_clst <= MAX_FAT16 || n_clst > MAX_FAT32) LEAVE_MKFS(FR_MKFS_ABORTED);
  			} else {				/* FAT volume */
  				if (pau == 0) {	/* au auto-selection */
  					n = (DWORD)sz_vol / 0x1000;	/* Volume size in unit of 4KS */
  					for (i = 0, pau = 1; cst[i] && cst[i] <= n; i++, pau <<= 1) ;	/* Get from table */
  				}
  				n_clst = (DWORD)sz_vol / pau;
  				if (n_clst > MAX_FAT12) {
  					n = n_clst * 2 + 4;		/* FAT size [byte] */
  				} else {
  					fsty = FS_FAT12;
  					n = (n_clst * 3 + 1) / 2 + 3;	/* FAT size [byte] */
  				}
  				sz_fat = (n + ss - 1) / ss;		/* FAT size [sector] */
  				sz_rsv = 1;						/* Number of reserved sectors */
  				sz_dir = (DWORD)n_root * SZDIRE / ss;	/* Root dir size [sector] */
  			}
  			b_fat = b_vol + sz_rsv;						/* FAT base */
  			b_data = b_fat + sz_fat * n_fat + sz_dir;	/* Data base */
  
  			/* Align data area to erase block boundary (for flash memory media) */
  			n = (DWORD)(((b_data + sz_blk - 1) & ~(sz_blk - 1)) - b_data);	/* Sectors to next nearest from current data base */
  			if (fsty == FS_FAT32) {		/* FAT32: Move FAT */
  				sz_rsv += n; b_fat += n;
  			} else {					/* FAT: Expand FAT */
  				if (n % n_fat) {	/* Adjust fractional error if needed */
  					n--; sz_rsv++; b_fat++;
  				}
  				sz_fat += n / n_fat;
  			}
  
  			/* Determine number of clusters and final check of validity of the FAT sub-type */
  			if (sz_vol < b_data + pau * 16 - b_vol) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too small volume? */
  			n_clst = ((DWORD)sz_vol - sz_rsv - sz_fat * n_fat - sz_dir) / pau;
  			if (fsty == FS_FAT32) {
  				if (n_clst <= MAX_FAT16) {	/* Too few clusters for FAT32? */
  					if (sz_au == 0 && (sz_au = pau / 2) != 0) continue;	/* Adjust cluster size and retry */
  					LEAVE_MKFS(FR_MKFS_ABORTED);
  				}
  			}
  			if (fsty == FS_FAT16) {
  				if (n_clst > MAX_FAT16) {	/* Too many clusters for FAT16 */
  					if (sz_au == 0 && (pau * 2) <= 64) {
  						sz_au = pau * 2; continue;	/* Adjust cluster size and retry */
  					}
  					if ((fsopt & FM_FAT32)) {
  						fsty = FS_FAT32; continue;	/* Switch type to FAT32 and retry */
  					}
  					if (sz_au == 0 && (sz_au = pau * 2) <= 128) continue;	/* Adjust cluster size and retry */
  					LEAVE_MKFS(FR_MKFS_ABORTED);
  				}
  				if  (n_clst <= MAX_FAT12) {	/* Too few clusters for FAT16 */
  					if (sz_au == 0 && (sz_au = pau * 2) <= 128) continue;	/* Adjust cluster size and retry */
  					LEAVE_MKFS(FR_MKFS_ABORTED);
  				}
  			}
  			if (fsty == FS_FAT12 && n_clst > MAX_FAT12) LEAVE_MKFS(FR_MKFS_ABORTED);	/* Too many clusters for FAT12 */
  
  			/* Ok, it is the valid cluster configuration */
  			break;
  		} while (1);
  
  #if FF_USE_TRIM
  		lba[0] = b_vol; lba[1] = b_vol + sz_vol - 1;	/* Inform storage device that the volume area may be erased */
  		disk_ioctl(pdrv, CTRL_TRIM, lba);
  #endif
  		/* Create FAT VBR */
  		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 {
  				sys = (fsty == FS_FAT16) ? 0x04 : 0x01;	/* FAT16 : FAT12 */
  			}
  		}
  	}
  
  	/* Update partition information */
  	if (FF_MULTI_PARTITION && ipart != 0) {	/* Volume is in the existing partition */
  		if (!FF_LBA64 || !(fsopt & 0x80)) {
  			/* Update system ID in the partition table */
  			if (disk_read(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Read the MBR */
  			buf[MBR_Table + (ipart - 1) * SZ_PTE + PTE_System] = sys;			/* Set system ID */
  			if (disk_write(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);	/* Write it back to the MBR */
  		}
  	} else {								/* Volume as a new single partition */
  		if (!(fsopt & FM_SFD)) {			/* Create partition table if not in SFD */
  			lba[0] = sz_vol; lba[1] = 0;
  			fr = create_partition(pdrv, lba, sys, buf);
  			if (fr != FR_OK) LEAVE_MKFS(fr);
  		}
  	}
  
  	if (disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
  
  	LEAVE_MKFS(FR_OK);
  }
  
  
  
  
  #if FF_MULTI_PARTITION
  /*-----------------------------------------------------------------------*/
  /* Create Partition Table on the Physical Drive                          */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_fdisk (
  	BYTE pdrv,			/* Physical drive number */
  	const LBA_t ptbl[],	/* Pointer to the size table for each partitions */
  	void* work			/* Pointer to the working buffer (null: use heap memory) */
  )
  {
  	BYTE *buf = (BYTE*)work;
  	DSTATUS stat;
  
  
  	stat = disk_initialize(pdrv);
  	if (stat & STA_NOINIT) return FR_NOT_READY;
  	if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
  #if FF_USE_LFN == 3
  	if (!buf) buf = ff_memalloc(FF_MAX_SS);	/* Use heap memory for working buffer */
  #endif
  	if (!buf) return FR_NOT_ENOUGH_CORE;
  
  	LEAVE_MKFS(create_partition(pdrv, ptbl, 0x07, buf));
  }
  
  #endif /* FF_MULTI_PARTITION */
  #endif /* !FF_FS_READONLY && FF_USE_MKFS */
  
  
  
  
  #if FF_USE_STRFUNC
  #if FF_USE_LFN && FF_LFN_UNICODE && (FF_STRF_ENCODE < 0 || FF_STRF_ENCODE > 3)
  #error Wrong FF_STRF_ENCODE setting
  #endif
  /*-----------------------------------------------------------------------*/
  /* Get a String from the File                                            */
  /*-----------------------------------------------------------------------*/
  
  TCHAR* f_gets (
  	TCHAR* buff,	/* Pointer to the buffer to store read string */
  	int len,		/* Size of string buffer (items) */
  	FIL* fp			/* Pointer to the file object */
  )
  {
  	int nc = 0;
  	TCHAR *p = buff;
  	BYTE s[4];
  	UINT rc;
  	DWORD dc;
  #if FF_USE_LFN && FF_LFN_UNICODE && FF_STRF_ENCODE <= 2
  	WCHAR wc;
  #endif
  #if FF_USE_LFN && FF_LFN_UNICODE && FF_STRF_ENCODE == 3
  	UINT ct;
  #endif
  
  #if FF_USE_LFN && FF_LFN_UNICODE			/* With code conversion (Unicode API) */
  	/* Make a room for the character and terminator  */
  	if (FF_LFN_UNICODE == 1) len -= (FF_STRF_ENCODE == 0) ? 1 : 2;
  	if (FF_LFN_UNICODE == 2) len -= (FF_STRF_ENCODE == 0) ? 3 : 4;
  	if (FF_LFN_UNICODE == 3) len -= 1;
  	while (nc < len) {
  #if FF_STRF_ENCODE == 0				/* Read a character in ANSI/OEM */
  		f_read(fp, s, 1, &rc);		/* Get a code unit */
  		if (rc != 1) break;			/* EOF? */
  		wc = s[0];
  		if (dbc_1st((BYTE)wc)) {	/* DBC 1st byte? */
  			f_read(fp, s, 1, &rc);	/* Get 2nd byte */
  			if (rc != 1 || !dbc_2nd(s[0])) continue;	/* Wrong code? */
  			wc = wc << 8 | s[0];
  		}
  		dc = ff_oem2uni(wc, CODEPAGE);	/* Convert ANSI/OEM into Unicode */
  		if (dc == 0) continue;		/* Conversion error? */
  #elif FF_STRF_ENCODE == 1 || FF_STRF_ENCODE == 2 	/* Read a character in UTF-16LE/BE */
  		f_read(fp, s, 2, &rc);		/* Get a code unit */
  		if (rc != 2) break;			/* EOF? */
  		dc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
  		if (IsSurrogateL(dc)) continue;	/* Broken surrogate pair? */
  		if (IsSurrogateH(dc)) {		/* High surrogate? */
  			f_read(fp, s, 2, &rc);	/* Get low surrogate */
  			if (rc != 2) break;		/* EOF? */
  			wc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
  			if (!IsSurrogateL(wc)) continue;	/* Broken surrogate pair? */
  			dc = ((dc & 0x3FF) + 0x40) << 10 | (wc & 0x3FF);	/* Merge surrogate pair */
  		}
  #else	/* Read a character in UTF-8 */
  		f_read(fp, s, 1, &rc);		/* Get a code unit */
  		if (rc != 1) break;			/* EOF? */
  		dc = s[0];
  		if (dc >= 0x80) {			/* Multi-byte sequence? */
  			ct = 0;
  			if ((dc & 0xE0) == 0xC0) { dc &= 0x1F; ct = 1; }	/* 2-byte sequence? */
  			if ((dc & 0xF0) == 0xE0) { dc &= 0x0F; ct = 2; }	/* 3-byte sequence? */
  			if ((dc & 0xF8) == 0xF0) { dc &= 0x07; ct = 3; }	/* 4-byte sequence? */
  			if (ct == 0) continue;
  			f_read(fp, s, ct, &rc);	/* Get trailing bytes */
  			if (rc != ct) break;
  			rc = 0;
  			do {	/* Merge the byte sequence */
  				if ((s[rc] & 0xC0) != 0x80) break;
  				dc = dc << 6 | (s[rc] & 0x3F);
  			} while (++rc < ct);
  			if (rc != ct || dc < 0x80 || IsSurrogate(dc) || dc >= 0x110000) continue;	/* Wrong encoding? */
  		}
  #endif
  		/* A code point is avaialble in dc to be output */
  
  		if (FF_USE_STRFUNC == 2 && dc == '\r') continue;	/* Strip \r off if needed */
  #if FF_LFN_UNICODE == 1	|| FF_LFN_UNICODE == 3	/* Output it in UTF-16/32 encoding */
  		if (FF_LFN_UNICODE == 1 && dc >= 0x10000) {	/* Out of BMP at UTF-16? */
  			*p++ = (TCHAR)(0xD800 | ((dc >> 10) - 0x40)); nc++;	/* Make and output high surrogate */
  			dc = 0xDC00 | (dc & 0x3FF);		/* Make low surrogate */
  		}
  		*p++ = (TCHAR)dc; nc++;
  		if (dc == '\n') break;	/* End of line? */
  #elif FF_LFN_UNICODE == 2		/* Output it in UTF-8 encoding */
  		if (dc < 0x80) {	/* Single byte? */
  			*p++ = (TCHAR)dc;
  			nc++;
  			if (dc == '\n') break;	/* End of line? */
  		} else {
  			if (dc < 0x800) {		/* 2-byte sequence? */
  				*p++ = (TCHAR)(0xC0 | (dc >> 6 & 0x1F));
  				*p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
  				nc += 2;
  			} else {
  				if (dc < 0x10000) {	/* 3-byte sequence? */
  					*p++ = (TCHAR)(0xE0 | (dc >> 12 & 0x0F));
  					*p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
  					*p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
  					nc += 3;
  				} else {			/* 4-byte sequence? */
  					*p++ = (TCHAR)(0xF0 | (dc >> 18 & 0x07));
  					*p++ = (TCHAR)(0x80 | (dc >> 12 & 0x3F));
  					*p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
  					*p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
  					nc += 4;
  				}
  			}
  		}
  #endif
  	}
  
  #else			/* Byte-by-byte read without any conversion (ANSI/OEM API) */
  	len -= 1;	/* Make a room for the terminator */
  	while (nc < len) {
  		f_read(fp, s, 1, &rc);	/* Get a byte */
  		if (rc != 1) break;		/* EOF? */
  		dc = s[0];
  		if (FF_USE_STRFUNC == 2 && dc == '\r') continue;
  		*p++ = (TCHAR)dc; nc++;
  		if (dc == '\n') break;
  	}
  #endif
  
  	*p = 0;		/* Terminate the string */
  	return nc ? buff : 0;	/* When no data read due to EOF or error, return with error. */
  }
  
  
  
  
  #if !FF_FS_READONLY
  #include <stdarg.h>
  #define SZ_PUTC_BUF	64
  #define SZ_NUM_BUF	32
  
  /*-----------------------------------------------------------------------*/
  /* Put a Character to the File (with sub-functions)                      */
  /*-----------------------------------------------------------------------*/
  
  /* Output buffer and work area */
  
  typedef struct {
  	FIL *fp;		/* Ptr to the writing file */
  	int idx, nchr;	/* Write index of buf[] (-1:error), number of encoding units written */
  #if FF_USE_LFN && FF_LFN_UNICODE == 1
  	WCHAR hs;
  #elif FF_USE_LFN && FF_LFN_UNICODE == 2
  	BYTE bs[4];
  	UINT wi, ct;
  #endif
  	BYTE buf[SZ_PUTC_BUF];	/* Write buffer */
  } putbuff;
  
  
  /* Buffered file write with code conversion */
  
  static void putc_bfd (putbuff* pb, TCHAR c)
  {
  	UINT n;
  	int i, nc;
  #if FF_USE_LFN && FF_LFN_UNICODE
  	WCHAR hs, wc;
  #if FF_LFN_UNICODE == 2
  	DWORD dc;
  	const TCHAR *tp;
  #endif
  #endif
  
  	if (FF_USE_STRFUNC == 2 && c == '\n') {	 /* LF -> CRLF conversion */
  		putc_bfd(pb, '\r');
  	}
  
  	i = pb->idx;			/* Write index of pb->buf[] */
  	if (i < 0) return;		/* In write error? */
  	nc = pb->nchr;			/* Write unit counter */
  
  #if FF_USE_LFN && FF_LFN_UNICODE
  #if FF_LFN_UNICODE == 1		/* UTF-16 input */
  	if (IsSurrogateH(c)) {	/* High surrogate? */
  		pb->hs = c; return;	/* Save it for next */
  	}
  	hs = pb->hs; pb->hs = 0;
  	if (hs != 0) {			/* There is a leading high surrogate */
  		if (!IsSurrogateL(c)) hs = 0;	/* Discard high surrogate if not a surrogate pair */
  	} else {
  		if (IsSurrogateL(c)) return;	/* Discard stray low surrogate */
  	}
  	wc = c;
  #elif FF_LFN_UNICODE == 2	/* UTF-8 input */
  	for (;;) {
  		if (pb->ct == 0) {	/* Out of multi-byte sequence? */
  			pb->bs[pb->wi = 0] = (BYTE)c;	/* Save 1st byte */
  			if ((BYTE)c < 0x80) break;					/* Single byte? */
  			if (((BYTE)c & 0xE0) == 0xC0) pb->ct = 1;	/* 2-byte sequence? */
  			if (((BYTE)c & 0xF0) == 0xE0) pb->ct = 2;	/* 3-byte sequence? */
  			if (((BYTE)c & 0xF1) == 0xF0) pb->ct = 3;	/* 4-byte sequence? */
  			return;
  		} else {				/* In the multi-byte sequence */
  			if (((BYTE)c & 0xC0) != 0x80) {	/* Broken sequence? */
  				pb->ct = 0; continue;
  			}
  			pb->bs[++pb->wi] = (BYTE)c;	/* Save the trailing byte */
  			if (--pb->ct == 0) break;	/* End of multi-byte sequence? */
  			return;
  		}
  	}
  	tp = (const TCHAR*)pb->bs;
  	dc = tchar2uni(&tp);	/* UTF-8 ==> UTF-16 */
  	if (dc == 0xFFFFFFFF) return;	/* Wrong code? */
  	wc = (WCHAR)dc;
  	hs = (WCHAR)(dc >> 16);
  #elif FF_LFN_UNICODE == 3	/* UTF-32 input */
  	if (IsSurrogate(c) || c >= 0x110000) return;	/* Discard invalid code */
  	if (c >= 0x10000) {		/* Out of BMP? */
  		hs = (WCHAR)(0xD800 | ((c >> 10) - 0x40)); 	/* Make high surrogate */
  		wc = 0xDC00 | (c & 0x3FF);					/* Make low surrogate */
  	} else {
  		hs = 0;
  		wc = (WCHAR)c;
  	}
  #endif
  	/* A code point in UTF-16 is available in hs and wc */
  
  #if FF_STRF_ENCODE == 1		/* Write a code point in UTF-16LE */
  	if (hs != 0) {	/* Surrogate pair? */
  		st_word(&pb->buf[i], hs);
  		i += 2;
  		nc++;
  	}
  	st_word(&pb->buf[i], wc);
  	i += 2;
  #elif FF_STRF_ENCODE == 2	/* Write a code point in UTF-16BE */
  	if (hs != 0) {	/* Surrogate pair? */
  		pb->buf[i++] = (BYTE)(hs >> 8);
  		pb->buf[i++] = (BYTE)hs;
  		nc++;
  	}
  	pb->buf[i++] = (BYTE)(wc >> 8);
  	pb->buf[i++] = (BYTE)wc;
  #elif FF_STRF_ENCODE == 3	/* Write a code point in UTF-8 */
  	if (hs != 0) {	/* 4-byte sequence? */
  		nc += 3;
  		hs = (hs & 0x3FF) + 0x40;
  		pb->buf[i++] = (BYTE)(0xF0 | hs >> 8);
  		pb->buf[i++] = (BYTE)(0x80 | (hs >> 2 & 0x3F));
  		pb->buf[i++] = (BYTE)(0x80 | (hs & 3) << 4 | (wc >> 6 & 0x0F));
  		pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
  	} else {
  		if (wc < 0x80) {	/* Single byte? */
  			pb->buf[i++] = (BYTE)wc;
  		} else {
  			if (wc < 0x800) {	/* 2-byte sequence? */
  				nc += 1;
  				pb->buf[i++] = (BYTE)(0xC0 | wc >> 6);
  			} else {			/* 3-byte sequence */
  				nc += 2;
  				pb->buf[i++] = (BYTE)(0xE0 | wc >> 12);
  				pb->buf[i++] = (BYTE)(0x80 | (wc >> 6 & 0x3F));
  			}
  			pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
  		}
  	}
  #else						/* Write a code point in ANSI/OEM */
  	if (hs != 0) return;
  	wc = ff_uni2oem(wc, CODEPAGE);	/* UTF-16 ==> ANSI/OEM */
  	if (wc == 0) return;
  	if (wc >= 0x100) {
  		pb->buf[i++] = (BYTE)(wc >> 8); nc++;
  	}
  	pb->buf[i++] = (BYTE)wc;
  #endif
  
  #else							/* ANSI/OEM input (without re-encoding) */
  	pb->buf[i++] = (BYTE)c;
  #endif
  
  	if (i >= (int)(sizeof pb->buf) - 4) {	/* Write buffered characters to the file */
  		f_write(pb->fp, pb->buf, (UINT)i, &n);
  		i = (n == (UINT)i) ? 0 : -1;
  	}
  	pb->idx = i;
  	pb->nchr = nc + 1;
  }
  
  
  /* Flush remaining characters in the buffer */
  
  static int putc_flush (putbuff* pb)
  {
  	UINT nw;
  
  	if (   pb->idx >= 0	/* Flush buffered characters to the file */
  		&& f_write(pb->fp, pb->buf, (UINT)pb->idx, &nw) == FR_OK
  		&& (UINT)pb->idx == nw) return pb->nchr;
  	return -1;
  }
  
  
  /* Initialize write buffer */
  
  static void putc_init (putbuff* pb, FIL* fp)
  {
  	memset(pb, 0, sizeof (putbuff));
  	pb->fp = fp;
  }
  
  
  
  int f_putc (
  	TCHAR c,	/* A character to be output */
  	FIL* fp		/* Pointer to the file object */
  )
  {
  	putbuff pb;
  
  
  	putc_init(&pb, fp);
  	putc_bfd(&pb, c);	/* Put the character */
  	return putc_flush(&pb);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Put a String to the File                                              */
  /*-----------------------------------------------------------------------*/
  
  int f_puts (
  	const TCHAR* str,	/* Pointer to the string to be output */
  	FIL* fp				/* Pointer to the file object */
  )
  {
  	putbuff pb;
  
  
  	putc_init(&pb, fp);
  	while (*str) putc_bfd(&pb, *str++);		/* Put the string */
  	return putc_flush(&pb);
  }
  
  
  
  
  /*-----------------------------------------------------------------------*/
  /* Put a Formatted String to the File (with sub-functions)               */
  /*-----------------------------------------------------------------------*/
  #if FF_PRINT_FLOAT && FF_INTDEF == 2
  #include <math.h>
  
  static int ilog10 (double n)	/* Calculate log10(n) in integer output */
  {
  	int rv = 0;
  
  	while (n >= 10) {	/* Decimate digit in right shift */
  		if (n >= 100000) {
  			n /= 100000; rv += 5;
  		} else {
  			n /= 10; rv++;
  		}
  	}
  	while (n < 1) {		/* Decimate digit in left shift */
  		if (n < 0.00001) {
  			n *= 100000; rv -= 5;
  		} else {
  			n *= 10; rv--;
  		}
  	}
  	return rv;
  }
  
  
  static double i10x (int n)	/* Calculate 10^n in integer input */
  {
  	double rv = 1;
  
  	while (n > 0) {		/* Left shift */
  		if (n >= 5) {
  			rv *= 100000; n -= 5;
  		} else {
  			rv *= 10; n--;
  		}
  	}
  	while (n < 0) {		/* Right shift */
  		if (n <= -5) {
  			rv /= 100000; n += 5;
  		} else {
  			rv /= 10; n++;
  		}
  	}
  	return rv;
  }
  
  
  static void ftoa (
  	char* buf,	/* Buffer to output the floating point string */
  	double val,	/* Value to output */
  	int prec,	/* Number of fractional digits */
  	TCHAR fmt	/* Notation */
  )
  {
  	int d;
  	int e = 0, m = 0;
  	char sign = 0;
  	double w;
  	const char *er = 0;
  	const char ds = FF_PRINT_FLOAT == 2 ? ',' : '.';
  
  
  	if (isnan(val)) {			/* Not a number? */
  		er = "NaN";
  	} else {
  		if (prec < 0) prec = 6;	/* Default precision? (6 fractional digits) */
  		if (val < 0) {			/* Nagative? */
  			val = 0 - val; sign = '-';
  		} else {
  			sign = '+';
  		}
  		if (isinf(val)) {		/* Infinite? */
  			er = "INF";
  		} else {
  			if (fmt == 'f') {	/* Decimal notation? */
  				val += i10x(0 - prec) / 2;	/* Round (nearest) */
  				m = ilog10(val);
  				if (m < 0) m = 0;
  				if (m + prec + 3 >= SZ_NUM_BUF) er = "OV";	/* Buffer overflow? */
  			} else {			/* E notation */
  				if (val != 0) {		/* Not a true zero? */
  					val += i10x(ilog10(val) - prec) / 2;	/* Round (nearest) */
  					e = ilog10(val);
  					if (e > 99 || prec + 7 >= SZ_NUM_BUF) {	/* Buffer overflow or E > +99? */
  						er = "OV";
  					} else {
  						if (e < -99) e = -99;
  						val /= i10x(e);	/* Normalize */
  					}
  				}
  			}
  		}
  		if (!er) {	/* Not error condition */
  			if (sign == '-') *buf++ = sign;	/* Add a - if negative value */
  			do {				/* Put decimal number */
  				if (m == -1) *buf++ = ds;	/* Insert a decimal separator when get into fractional part */
  				w = i10x(m);				/* Snip the highest digit d */
  				d = (int)(val / w); val -= d * w;
  				*buf++ = (char)('0' + d);	/* Put the digit */
  			} while (--m >= -prec);			/* Output all digits specified by prec */
  			if (fmt != 'f') {	/* Put exponent if needed */
  				*buf++ = (char)fmt;
  				if (e < 0) {
  					e = 0 - e; *buf++ = '-';
  				} else {
  					*buf++ = '+';
  				}
  				*buf++ = (char)('0' + e / 10);
  				*buf++ = (char)('0' + e % 10);
  			}
  		}
  	}
  	if (er) {	/* Error condition */
  		if (sign) *buf++ = sign;		/* Add sign if needed */
  		do *buf++ = *er++; while (*er);	/* Put error symbol */
  	}
  	*buf = 0;	/* Term */
  }
  #endif	/* FF_PRINT_FLOAT && FF_INTDEF == 2 */
  
  
  
  int f_printf (
  	FIL* fp,			/* Pointer to the file object */
  	const TCHAR* fmt,	/* Pointer to the format string */
  	...					/* Optional arguments... */
  )
  {
  	va_list arp;
  	putbuff pb;
  	UINT i, j, w, f, r;
  	int prec;
  #if FF_PRINT_LLI && FF_INTDEF == 2
  	QWORD v;
  #else
  	DWORD v;
  #endif
  	TCHAR tc, pad, *tp;
  	TCHAR nul = 0;
  	char d, str[SZ_NUM_BUF];
  
  
  	putc_init(&pb, fp);
  
  	va_start(arp, fmt);
  
  	for (;;) {
  		tc = *fmt++;
  		if (tc == 0) break;			/* End of format string */
  		if (tc != '%') {			/* Not an escape character (pass-through) */
  			putc_bfd(&pb, tc);
  			continue;
  		}
  		f = w = 0; pad = ' '; prec = -1;	/* Initialize parms */
  		tc = *fmt++;
  		if (tc == '0') {			/* Flag: '0' padded */
  			pad = '0'; tc = *fmt++;
  		} else if (tc == '-') {		/* Flag: Left aligned */
  			f = 2; tc = *fmt++;
  		}
  		if (tc == '*') {			/* Minimum width from an argument */
  			w = va_arg(arp, int);
  			tc = *fmt++;
  		} else {
  			while (IsDigit(tc)) {	/* Minimum width */
  				w = w * 10 + tc - '0';
  				tc = *fmt++;
  			}
  		}
  		if (tc == '.') {			/* Precision */
  			tc = *fmt++;
  			if (tc == '*') {		/* Precision from an argument */
  				prec = va_arg(arp, int);
  				tc = *fmt++;
  			} else {
  				prec = 0;
  				while (IsDigit(tc)) {	/* Precision */
  					prec = prec * 10 + tc - '0';
  					tc = *fmt++;
  				}
  			}
  		}
  		if (tc == 'l') {			/* Size: long int */
  			f |= 4; tc = *fmt++;
  #if FF_PRINT_LLI && FF_INTDEF == 2
  			if (tc == 'l') {		/* Size: long long int */
  				f |= 8; tc = *fmt++;
  			}
  #endif
  		}
  		if (tc == 0) break;			/* End of format string */
  		switch (tc) {				/* Atgument type is... */
  		case 'b':					/* Unsigned binary */
  			r = 2; break;
  		case 'o':					/* Unsigned octal */
  			r = 8; break;
  		case 'd':					/* Signed decimal */
  		case 'u':					/* Unsigned decimal */
  			r = 10; break;
  		case 'x':					/* Unsigned hexdecimal (lower case) */
  		case 'X':					/* Unsigned hexdecimal (upper case) */
  			r = 16; break;
  		case 'c':					/* Character */
  			putc_bfd(&pb, (TCHAR)va_arg(arp, int));
  			continue;
  		case 's':					/* String */
  			tp = va_arg(arp, TCHAR*);	/* Get a pointer argument */
  			if (!tp) tp = &nul;		/* Null ptr generates a null string */
  			for (j = 0; tp[j]; j++) ;	/* j = tcslen(tp) */
  			if (prec >= 0 && j > (UINT)prec) j = prec;	/* Limited length of string body */
  			for ( ; !(f & 2) && j < w; j++) putc_bfd(&pb, pad);	/* Left pads */
  			while (*tp && prec--) putc_bfd(&pb, *tp++);	/* Body */
  			while (j++ < w) putc_bfd(&pb, ' ');			/* Right pads */
  			continue;
  #if FF_PRINT_FLOAT && FF_INTDEF == 2
  		case 'f':					/* Floating point (decimal) */
  		case 'e':					/* Floating point (e) */
  		case 'E':					/* Floating point (E) */
  			ftoa(str, va_arg(arp, double), prec, tc);	/* Make a flaoting point string */
  			for (j = strlen(str); !(f & 2) && j < w; j++) putc_bfd(&pb, pad);	/* Left pads */
  			for (i = 0; str[i]; putc_bfd(&pb, str[i++])) ;	/* Body */
  			while (j++ < w) putc_bfd(&pb, ' ');	/* Right pads */
  			continue;
  #endif
  		default:					/* Unknown type (pass-through) */
  			putc_bfd(&pb, tc); continue;
  		}
  
  		/* Get an integer argument and put it in numeral */
  #if FF_PRINT_LLI && FF_INTDEF == 2
  		if (f & 8) {	/* long long argument? */
  			v = (QWORD)va_arg(arp, LONGLONG);
  		} else {
  			if (f & 4) {	/* long argument? */
  				v = (tc == 'd') ? (QWORD)(LONGLONG)va_arg(arp, long) : (QWORD)va_arg(arp, unsigned long);
  			} else {		/* int/short/char argument */
  				v = (tc == 'd') ? (QWORD)(LONGLONG)va_arg(arp, int) : (QWORD)va_arg(arp, unsigned int);
  			}
  		}
  		if (tc == 'd' && (v & 0x8000000000000000)) {	/* Negative value? */
  			v = 0 - v; f |= 1;
  		}
  #else
  		if (f & 4) {	/* long argument? */
  			v = (DWORD)va_arg(arp, long);
  		} else {		/* int/short/char argument */
  			v = (tc == 'd') ? (DWORD)(long)va_arg(arp, int) : (DWORD)va_arg(arp, unsigned int);
  		}
  		if (tc == 'd' && (v & 0x80000000)) {	/* Negative value? */
  			v = 0 - v; f |= 1;
  		}
  #endif
  		i = 0;
  		do {	/* Make an integer number string */
  			d = (char)(v % r); v /= r;
  			if (d > 9) d += (tc == 'x') ? 0x27 : 0x07;
  			str[i++] = d + '0';
  		} while (v && i < SZ_NUM_BUF);
  		if (f & 1) str[i++] = '-';	/* Sign */
  		/* Write it */
  		for (j = i; !(f & 2) && j < w; j++) putc_bfd(&pb, pad);	/* Left pads */
  		do putc_bfd(&pb, (TCHAR)str[--i]); while (i);	/* Body */
  		while (j++ < w) putc_bfd(&pb, ' ');		/* Right pads */
  	}
  
  	va_end(arp);
  
  	return putc_flush(&pb);
  }
  
  #endif /* !FF_FS_READONLY */
  #endif /* FF_USE_STRFUNC */
  
  
  
  #if FF_CODE_PAGE == 0
  /*-----------------------------------------------------------------------*/
  /* Set Active Codepage for the Path Name                                 */
  /*-----------------------------------------------------------------------*/
  
  FRESULT f_setcp (
  	WORD cp		/* Value to be set as active code page */
  )
  {
  	static const WORD       validcp[22] = {  437,   720,   737,   771,   775,   850,   852,   855,   857,   860,   861,   862,   863,   864,   865,   866,   869,   932,   936,   949,   950, 0};
  	static const BYTE* const tables[22] = {Ct437, Ct720, Ct737, Ct771, Ct775, Ct850, Ct852, Ct855, Ct857, Ct860, Ct861, Ct862, Ct863, Ct864, Ct865, Ct866, Ct869, Dc932, Dc936, Dc949, Dc950, 0};
  	UINT i;
  
  
  	for (i = 0; validcp[i] != 0 && validcp[i] != cp; i++) ;	/* Find the code page */
  	if (validcp[i] != cp) return FR_INVALID_PARAMETER;	/* Not found? */
  
  	CodePage = cp;
  	if (cp >= 900) {	/* DBCS */
  		ExCvt = 0;
  		DbcTbl = tables[i];
  	} else {			/* SBCS */
  		ExCvt = tables[i];
  		DbcTbl = 0;
  	}
  	return FR_OK;
  }
  #endif	/* FF_CODE_PAGE == 0 */
  
  