SVN операционной системы NedoOS для ZX-Evo

/*----------------------------------------------------------------------------/
/ FatFs - Generic FAT Filesystem Module R0.13c /
/-----------------------------------------------------------------------------/
/
/ Copyright (C) 2018, ChaN, all right reserved.
/
/ FatFs module is an open source software. Redistribution and use of FatFs in
/ source and binary forms, with or without modification, are permitted provided
/ that the following condition is met:
/
/ 1. Redistributions of source code must retain the above copyright notice,
/ this condition and the following disclaimer.
/
/ This software is provided by the copyright holder and contributors "AS IS"
/ and any warranties related to this software are DISCLAIMED.
/ The copyright owner or contributors be NOT LIABLE for any damages caused
/ by use of this software.
/
/----------------------------------------------------------------------------*/

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

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

Module Private Definitions

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

#if FF_DEFINED != 86604 /* Revision ID */
#error Wrong include file (ff.h).
#endif

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

/* Character code support macros */
#define IsUpper(c) ((c) >= 'A' && (c) <= 'Z')
#define IsLower(c) ((c) >= 'a' && (c) <= 'z')
#define IsDigit(c) ((c) >= '0' && (c) <= '9')
#define IsSurrogate(c) ((c) >= 0xD800 && (c) <= 0xDFFF)
#define IsSurrogateH(c) ((c) >= 0xD800 && (c) <= 0xDBFF)
#define IsSurrogateL(c) ((c) >= 0xDC00 && (c) <= 0xDFFF)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/* SBCS up-case tables (\x80-\xFF) */
#define TBL_CT437 {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT720 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT737 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xEF,0xF5,0xF0,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT771 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDC,0xDE,0xDE, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFE,0xFF}
#define TBL_CT775 {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F, \
0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT850 {0x43,0x55,0x45,0x41,0x41,0x41,0x41,0x43,0x45,0x45,0x45,0x49,0x49,0x49,0x41,0x41, \
0x45,0x92,0x92,0x4F,0x4F,0x4F,0x55,0x55,0x59,0x4F,0x55,0x4F,0x9C,0x4F,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0x41,0x41,0x41,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0x41,0x41,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD1,0xD1,0x45,0x45,0x45,0x49,0x49,0x49,0x49,0xD9,0xDA,0xDB,0xDC,0xDD,0x49,0xDF, \
0x4F,0xE1,0x4F,0x4F,0x4F,0x4F,0xE6,0xE8,0xE8,0x55,0x55,0x55,0x59,0x59,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT852 {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F, \
0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0xAC, \
0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}
#define TBL_CT855 {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F, \
0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF, \
0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT857 {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0x49,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT860 {0x80,0x9A,0x90,0x8F,0x8E,0x91,0x86,0x80,0x89,0x89,0x92,0x8B,0x8C,0x98,0x8E,0x8F, \
0x90,0x91,0x92,0x8C,0x99,0xA9,0x96,0x9D,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x86,0x8B,0x9F,0x96,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT861 {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x8B,0x8B,0x8D,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x8D,0x55,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
0xA4,0xA5,0xA6,0xA7,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT862 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT863 {0x43,0x55,0x45,0x41,0x41,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x41,0x8F, \
0x45,0x45,0x45,0x4F,0x45,0x49,0x55,0x55,0x98,0x4F,0x55,0x9B,0x9C,0x55,0x55,0x9F, \
0xA0,0xA1,0x4F,0x55,0xA4,0xA5,0xA6,0xA7,0x49,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT864 {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT865 {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT866 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT869 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x86,0x9C,0x8D,0x8F,0x90, \
0x91,0x90,0x92,0x95,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xA4,0xA5,0xA6,0xD9,0xDA,0xDB,0xDC,0xA7,0xA8,0xDF, \
0xA9,0xAA,0xAC,0xAD,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xCF,0xCF,0xD0,0xEF, \
0xF0,0xF1,0xD1,0xD2,0xD3,0xF5,0xD4,0xF7,0xF8,0xF9,0xD5,0x96,0x95,0x98,0xFE,0xFF}

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

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

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

Module Private Work Area

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

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

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

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

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

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

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

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

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

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

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

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

#else
#error Wrong setting of FF_USE_LFN

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

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

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

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

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

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

#endif

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

Module Private Functions

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

return r;
}

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

/* Test if the character 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 character 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 character from TCHAR string in defined API encodeing */
static DWORD tchar2uni ( /* Returns character in UTF-16 encoding (>=0x10000 on double encoding unit, 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 a 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) return 0xFFFFFFFF; /* Wrong code? */
if (uc >= 0x010000) uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF); /* Make a surrogate pair if needed */

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

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

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

/* Output a TCHAR string in defined API encoding */
static BYTE put_utf ( /* Returns number of encoding units written (0:buffer overflow or wrong encoding) */
DWORD chr, /* UTF-16 encoded character (Double encoding unit char 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 back the window */
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 */
DWORD sector /* Sector number to make appearance in the fs->win[] */
)
{
FRESULT res = FR_OK;

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

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

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

res = sync_window(fs);
if (res == FR_OK) {
if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) { /* FAT32: Update FSInfo sector if needed */
/* Create FSInfo structure */
mem_set(fs->win, 0, sizeof fs->win);
st_word(fs->win + BS_55AA, 0xAA55);
st_dword(fs->win + FSI_LeadSig, 0x41615252);
st_dword(fs->win + FSI_StrucSig, 0x61417272);
st_dword(fs->win + FSI_Free_Count, fs->free_clst);
st_dword(fs->win + FSI_Nxt_Free, fs->last_clst);
/* Write it into the FSInfo sector */
fs->winsect = fs->volbase + 1;
disk_write(fs->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 DWORD 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 + fs->csize * clst; /* Start sector number of the cluster */
}

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

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

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

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

switch (fs->fs_type) {
case FS_FAT12 :
bc = (UINT)clst; bc += bc / 2;
if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
wc = fs->win[bc++ % SS(fs)]; /* Get 1st byte of the entry */
if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
wc |= fs->win[bc % SS(fs)] << 8; /* Merge 2nd byte of the entry */
val = (clst & 1) ? (wc >> 4) : (wc & 0xFFF); /* Adjust bit position */
break;

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

case FS_FAT32 :
if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x0FFFFFFF; /* Simple DWORD array but mask out upper 4 bits */
break;
#if FF_FS_EXFAT
case FS_EXFAT :
if ((obj->objsize != 0 && obj->sclust != 0) || obj->stat == 0) { /* Object except root dir must have valid data length */
DWORD cofs = clst - obj->sclust; /* Offset from start cluster */
DWORD clen = (DWORD)((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;
}
}
/* go to default */
#endif
default:
val = 1; /* Internal error */
}
}

return val;
}

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

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

if (clst >= 2 && clst < fs->n_fatent) { /* Check if in valid range */
switch (fs->fs_type) {
case FS_FAT12 :
bc = (UINT)clst; bc += bc / 2; /* bc: byte offset of the entry */
res = move_window(fs, fs->fatbase + (bc / SS(fs)));
if (res != FR_OK) break;
p = fs->win + bc++ % SS(fs);
*p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val; /* Put 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)); /* Put 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;
DWORD 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
DWORD rt[2];
#endif

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

/* Mark the previous cluster 'EOC' on the FAT if it exists */
if (pclst != 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 freed */
rt[1] = clst2sect(fs, ecl) + fs->csize - 1; /* End of data area freed */
disk_ioctl(fs->pdrv, CTRL_TRIM, rt); /* Inform device the data in the block is no longer needed */
#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 */
)
{
DWORD sect;
UINT n, szb;
BYTE *ibuf;

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

/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index */
/*-----------------------------------------------------------------------*/

static FRESULT dir_sdi ( /* FR_OK(0):succeeded, !=0:error */
DIR* dp, /* Pointer to directory object */
DWORD ofs /* Offset of directory table */
)
{
DWORD csz, clst;
FATFS *fs = dp->obj.fs;

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

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

} else { /* Dynamic table (sub-directory or root-directory on the FAT32/exFAT volume) */
csz = (DWORD)fs->csize * SS(fs); /* Bytes per cluster */
while (ofs >= csz) { /* Follow cluster chain */
clst = get_fat(&dp->obj, clst); /* Get next cluster */
if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR; /* Reached to end of table or internal error */
ofs -= csz;
}
dp->sect = clst2sect(fs, clst);
}
dp->clust = clst; /* Current cluster# */
if (dp->sect == 0) return FR_INT_ERR;
dp->sect += ofs / SS(fs); /* Sector# of the directory entry */
dp->dir = fs->win + (ofs % SS(fs)); /* Pointer to the entry in the win[] */

return FR_OK;
}

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

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

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

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

if (dp->clust == 0) { /* Static table */
if (ofs / SZDIRE >= fs->n_rootdir) { /* Report EOT if it reached end of static table */
dp->sect = 0; return FR_NO_FILE;
}
}
else { /* Dynamic table */
if ((ofs / SS(fs) & (fs->csize - 1)) == 0) { /* Cluster changed? */
clst = get_fat(&dp->obj, dp->clust); /* Get next cluster */
if (clst <= 1) return FR_INT_ERR; /* Internal error */
if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
if (clst >= fs->n_fatent) { /* It reached end of dynamic table */
#if !FF_FS_READONLY
if (!stretch) { /* If no stretch, report EOT */
dp->sect = 0; return FR_NO_FILE;
}
clst = create_chain(&dp->obj, dp->clust); /* Allocate a cluster */
if (clst == 0) return FR_DENIED; /* No free cluster */
if (clst == 1) return FR_INT_ERR; /* Internal error */
if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
if (dir_clear(fs, clst) != FR_OK) return FR_DISK_ERR; /* Clean up the stretched table */
if (FF_FS_EXFAT) dp->obj.stat |= 4; /* exFAT: The directory has been stretched */
#else
if (!stretch) dp->sect = 0; /* (this line is to suppress compiler warning) */
dp->sect = 0; return FR_NO_FILE; /* Report EOT */
#endif
}
dp->clust = clst; /* Initialize data for new cluster */
dp->sect = clst2sect(fs, clst);
}
}
}
dp->dptr = ofs; /* Current entry */
dp->dir = fs->win + ofs % SS(fs); /* Pointer to the entry in the win[] */

return FR_OK;
}

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

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

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

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

#endif /* !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 || 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) return 0; /* Buffer overflow? */
lfnbuf[i++] = wc = uc; /* Store it */
} else {
if (uc != 0xFFFF) return 0; /* Check filler */
}
}

if (dir[LDIR_Ord] & LLEF) { /* Put terminator if it is the last LFN part */
if (i >= FF_MAX_LFN) 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 left locations */
} while (++s < 13);
if (wc == 0xFFFF || !lfn[i]) ord |= LLEF; /* Last LFN part is the start of LFN sequence */
dir[LDIR_Ord] = ord; /* Set the LFN order */
}

#endif /* !FF_FS_READONLY */
#endif /* FF_USE_LFN */

#if FF_USE_LFN && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Create a Numbered SFN */
/*-----------------------------------------------------------------------*/

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

mem_cpy(dst, src, 11);

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

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

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

#if FF_USE_LFN
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Calculate checksum of an SFN entry */
/*-----------------------------------------------------------------------*/

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

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

#endif /* FF_USE_LFN */

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

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

szblk = (dir[XDIR_NumSec] + 1) * SZDIRE; /* Number of bytes of the entry block */
for (i = sum = 0; i < szblk; i++) {
if (i == XDIR_SetSum) { /* Skip 2-byte sum field */
i++;
} else {
sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + dir[i];
}
}
return sum;
}

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

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

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

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

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

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

fno->fattrib = dirb[XDIR_Attr]; /* Attribute */
fno->fsize = (fno->fattrib & AM_DIR) ? 0 : ld_qword(dirb + XDIR_FileSize); /* Size */
fno->ftime = ld_word(dirb + XDIR_ModTime + 0); /* Time */
fno->fdate = ld_word(dirb + XDIR_ModTime + 2); /* Date */
}

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

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

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

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

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

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

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

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

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

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

static FRESULT load_obj_xdir (
DIR* dp, /* Blank directory object to be used to access containing direcotry */
const FFOBJID* obj /* Object with its containing directory information */
)
{
FRESULT res;

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

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

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

static FRESULT store_xdir (
DIR* dp /* Pointer to the direcotry object */
)
{
FRESULT res;
UINT nent;
BYTE* dirb = dp->obj.fs->dirbuf; /* Pointer to the direcotry entry block 85+C0+C1s */

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

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

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

static void create_xdir (
BYTE* dirb, /* Pointer to the direcotry entry block buffer */
const WCHAR* lfn /* Pointer to the object name */
)
{
UINT i;
BYTE nc1, nlen;
WCHAR wc;

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

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

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

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

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

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

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

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

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

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

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

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

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

while ((res = DIR_READ_FILE(dp)) == FR_OK) { /* Read an item */
#if FF_MAX_LFN < 255
if (fs->dirbuf[XDIR_NumName] > FF_MAX_LFN) continue; /* Skip comparison if inaccessible object name */
#endif
if (ld_word(fs->dirbuf + XDIR_NameHash) != hash) continue; /* Skip comparison if hash mismatched */
for (nc = fs->dirbuf[XDIR_NumName], di = SZDIRE * 2, ni = 0; nc; nc--, di += 2, ni++) { /* Compare the name */
if ((di % SZDIRE) == 0) di += 2;
if (ff_wtoupper(ld_word(fs->dirbuf + di)) != ff_wtoupper(fs->lfnbuf[ni])) break;
}
if (nc == 0 && !fs->lfnbuf[ni]) break; /* Name matched? */
}
return res;
}
#endif
/* On the FAT/FAT32 volume */
#if FF_USE_LFN
ord = sum = 0xFF; dp->blk_ofs = 0xFFFFFFFF; /* Reset LFN sequence */
#endif
do {
res = move_window(fs, dp->sect);
if (res != FR_OK) break;
c = dp->dir[DIR_Name];
if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */
#if FF_USE_LFN /* LFN configuration */
dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;
if (c == DDEM || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */
ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF; /* Reset LFN sequence */
} else {
if (a == AM_LFN) { /* An LFN entry is found */
if (!(dp->fn[NSFLAG] & NS_NOLFN)) {
if (c & LLEF) { /* Is it start of LFN sequence? */
sum = dp->dir[LDIR_Chksum];
c &= (BYTE)~LLEF; ord = c; /* LFN start order */
dp->blk_ofs = dp->dptr; /* Start offset of LFN */
}
/* Check validity of the LFN entry and compare it with given name */
ord = (c == ord && sum == dp->dir[LDIR_Chksum] && cmp_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
}
} else { /* An SFN entry is found */
if (ord == 0 && sum == sum_sfn(dp->dir)) break; /* LFN matched? */
if (!(dp->fn[NSFLAG] & NS_LOSS) && !mem_cmp(dp->dir, dp->fn, 11)) break; /* SFN matched? */
ord = 0xFF; dp->blk_ofs = 0xFFFFFFFF; /* Reset LFN sequence */
}
}
#else /* Non LFN configuration */
dp->obj.attr = dp->dir[DIR_Attr] & AM_MASK;
if (!(dp->dir[DIR_Attr] & AM_VOL) && !mem_cmp(dp->dir, dp->fn, 11)) break; /* Is it a valid entry? */
#endif
res = dir_next(dp, 0); /* Next entry */
} while (res == FR_OK);

return res;
}

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

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

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

#if FF_FS_EXFAT
if (fs->fs_type == FS_EXFAT) { /* On the exFAT volume */
nent = (nlen + 14) / 15 + 2; /* Number of entries to allocate (85+C0+C1s) */
res = dir_alloc(dp, nent); /* Allocate directory entries */
if (res != FR_OK) return res;
dp->blk_ofs = dp->dptr - SZDIRE * (nent - 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); /* Update the allocation status */
st_qword(fs->dirbuf + XDIR_ValidFileSize, dp->obj.objsize);
fs->dirbuf[XDIR_GenFlags] = dp->obj.stat | 1;
res = store_xdir(&dj); /* Store the object status */
if (res != FR_OK) return res;
}
}

create_xdir(fs->dirbuf, fs->lfnbuf); /* Create on-memory directory block to be written later */
return FR_OK;
}
#endif
/* On the FAT/FAT32 volume */
mem_cpy(sn, dp->fn, 12);
if (sn[NSFLAG] & NS_LOSS) { /* When LFN is out of 8.3 format, generate a numbered name */
dp->fn[NSFLAG] = NS_NOLFN; /* Find only SFN */
for (n = 1; n < 100; n++) {
gen_numname(dp->fn, sn, fs->lfnbuf, n); /* Generate a numbered name */
res = dir_find(dp); /* Check if the name collides with existing SFN */
if (res != FR_OK) break;
}
if (n == 100) return FR_DENIED; /* Abort if too many collisions */
if (res != FR_NO_FILE) return res; /* Abort if the result is other than 'not collided' */
dp->fn[NSFLAG] = sn[NSFLAG];
}

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

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

#endif

/* Set SFN entry */
if (res == FR_OK) {
res = move_window(fs, dp->sect);
if (res == FR_OK) {
mem_set(dp->dir, 0, SZDIRE); /* Clean the entry */
mem_cpy(dp->dir + DIR_Name, dp->fn, 11); /* Put SFN */
#if 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
WCHAR wc, hs;
FATFS *fs = dp->obj.fs;
#else
TCHAR c;
#endif

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

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

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

if (fno->fname[0] == 0) { /* If LFN is invalid, altname[] needs to be copied to fname[] */
if (di == 0) { /* If LFN and SFN both are invalid, this object is inaccesible */
fno->fname[di++] = '?';
} else {
for (si = di = 0; fno->altname[si]; si++, di++) { /* Copy altname[] to fname[] with case information */
wc = (WCHAR)fno->altname[si];
if (IsUpper(wc) && (dp->dir[DIR_NTres] & ((si >= 9) ? NS_EXT : NS_BODY))) wc += 0x20;
fno->fname[di] = (TCHAR)wc;
}
}
fno->fname[di] = 0; /* Terminate the LFN */
if (!dp->dir[DIR_NTres]) fno->altname[0] = 0; /* Altname is not needed if neither LFN nor case info is exist. */
}

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

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

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

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

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

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

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

return 0;
}

#endif /* FF_USE_FIND && FF_FS_MINIMIZE <= 1 */

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

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

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

#if FF_FS_RPATH != 0
if ((di == 1 && lfn[di - 1] == '.') ||
(di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) { /* Is this segment a dot name? */
lfn[di] = 0;
for (i = 0; i < 11; i++) { /* Create dot name for SFN entry */
dp->fn[i] = (i < di) ? '.' : ' ';
}
dp->fn[i] = cf | NS_DOT; /* This is a dot entry */
return FR_OK;
}
#endif
while (di) { /* Snip off trailing spaces and dots if exist */
wc = lfn[di - 1];
if (wc != ' ' && wc != '.') break;
di--;
}
lfn[di] = 0; /* LFN is created into the working buffer */
if (di == 0) return FR_INVALID_NAME; /* Reject null name */

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

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

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

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

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

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

if (ni == 8) b <<= 2; /* Shift capital flags if no extension */
if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03) cf |= NS_LFN; /* LFN entry needs to be created if composite capitals */
if (!(cf & NS_LFN)) { /* When LFN is in 8.3 format without extended character, NT flags are created */
if (b & 0x01) cf |= NS_EXT; /* NT flag (Extension has small capital letters only) */
if (b & 0x04) cf |= NS_BODY; /* NT flag (Body has small capital letters only) */
}

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

return FR_OK;

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

/* Create file name in directory form */
p = *path; sfn = dp->fn;
mem_set(sfn, ' ', 11);
si = i = 0; ni = 8;
#if FF_FS_RPATH != 0
if (p[si] == '.') { /* Is this a dot entry? */
for (;;) {
c = (BYTE)p[si++];
if (c != '.' || si >= 3) break;
sfn[i++] = c;
}
if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
*path = p + si; /* Return pointer to the next segment */
sfn[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT; /* Set last segment flag if end of the path */
return FR_OK;
}
#endif
for (;;) {
c = (BYTE)p[si++]; /* Get a byte */
if (c <= ' ') break;    /* Break if end of the path name */
if (c == '/' || c == '\\') { /* Break if a separator is found */
while (p[si] == '/' || p[si] == '\\') si++; /* Skip duplicated separator if exist */
break;
}
if (c == '.' || i >= ni) { /* End of body or field overflow? */
if (ni == 11 || c != '.') return FR_INVALID_NAME; /* Field overflow or invalid dot? */
i = 8; ni = 11; /* Enter file extension field */
continue;
}
#if FF_CODE_PAGE == 0
if (ExCvt && c >= 0x80) { /* Is SBC extended character? */
c = ExCvt[c & 0x7F]; /* To upper SBC extended character */
}
#elif FF_CODE_PAGE < 900
if (c >= 0x80) { /* Is SBC extended character? */
c = ExCvt[c & 0x7F]; /* To upper SBC extended character */
}
#endif
if (dbc_1st(c)) { /* Check if it is a DBC 1st byte */
d = (BYTE)p[si++]; /* Get 2nd byte */
if (!dbc_2nd(d) || i >= ni - 1) return FR_INVALID_NAME; /* Reject invalid DBC */
sfn[i++] = c;
sfn[i++] = d;
} else { /* SBC */
if (chk_chr("\"*+,:;<=>\?[]|\x7F", c)) return FR_INVALID_NAME; /* Reject illegal chrs for SFN */
if (IsLower(c)) c -= 0x20; /* To upper */
sfn[i++] = c;
}
}
*path = p + si; /* Return pointer to the next segment */
if (i == 0) return FR_INVALID_NAME; /* Reject nul string */

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

return FR_OK;
#endif /* FF_USE_LFN */
}

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

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

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

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

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

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

return res;
}

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

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

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

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

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

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

if (ld_word(fs->win + BS_55AA) != 0xAA55) return 3; /* Check boot record signature (always here regardless of the sector size) */

#if FF_FS_EXFAT
if (!mem_cmp(fs->win + BS_JmpBoot, "\xEB\x76\x90" "EXFAT ", 11)) return 1; /* Check if exFAT VBR */
#endif
if (fs->win[BS_JmpBoot] == 0xE9 || fs->win[BS_JmpBoot] == 0xEB || fs->win[BS_JmpBoot] == 0xE8) { /* Valid JumpBoot code? */
if (!mem_cmp(fs->win + BS_FilSysType, "FAT", 3)) return 0; /* Is it an FAT VBR? */
if (!mem_cmp(fs->win + BS_FilSysType32, "FAT32", 5)) return 0; /* Is it an FAT32 VBR? */
}
return 2; /* Valid BS but not FAT */
}

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

static FRESULT find_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 */
)
{
BYTE fmt, *pt;
int vol;
DSTATUS stat;
DWORD bsect, fasize, tsect, sysect, nclst, szbfat, br[4];
WORD nrsv;
FATFS *fs;
UINT i;

/* 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 valid */
}
}

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

fs->fs_type = 0; /* Clear the filesystem object */
fs->pdrv = LD2PD(vol); /* Bind the logical drive and a 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 partition on the drive. Supports only generic partitioning rules, FDISK (MBR) and SFD (w/o partition). */
bsect = 0;
fmt = check_fs(fs, bsect); /* Load sector 0 and check if it is an FAT-VBR as SFD */
if (fmt == 2 || (fmt < 2 && LD2PT(vol) != 0)) { /* Not an FAT-VBR or forced partition number */
for (i = 0; i < 4; i++) { /* Get partition offset */
pt = fs->win + (MBR_Table + i * SZ_PTE);
br[i] = pt[PTE_System] ? ld_dword(pt + PTE_StLba) : 0;
}
i = LD2PT(vol); /* Partition number: 0:auto, 1-4:forced */
if (i != 0) i--;
do { /* Find an FAT volume */
bsect = br[i];
fmt = bsect ? check_fs(fs, bsect) : 3; /* Check the partition */
} while (LD2PT(vol) == 0 && fmt >= 2 && ++i < 4);
}
if (fmt == 4) return FR_DISK_ERR; /* An error occured in the disk I/O layer */
if (fmt >= 2) return FR_NO_FILESYSTEM; /* No FAT volume is found */

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

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

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

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

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

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

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

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

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

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

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

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

#if !FF_FS_READONLY
fs->last_clst = fs->free_clst = 0xFFFFFFFF; /* Initialize cluster allocation information */
#endif
fmt = FS_EXFAT; /* FAT sub-type */
} else
#endif /* FF_FS_EXFAT */
{
if (ld_word(fs->win + BPB_BytsPerSec) != SS(fs)) return FR_NO_FILESYSTEM; /* (BPB_BytsPerSec must be equal to the physical sector size) */

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

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

fs->csize = fs->win[BPB_SecPerClus]; /* Cluster size */
if (fs->csize == 0 || (fs->csize & (fs->csize - 1))) return FR_NO_FILESYSTEM; /* (Must be power of 2) */

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

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

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

/* Determine the FAT sub type */
sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZDIRE); /* RSV + FAT + DIR */
if (tsect < sysect) return FR_NO_FILESYSTEM; /* (Invalid volume size) */
nclst = (tsect - sysect) / fs->csize; /* Number of clusters */
if (nclst == 0) return FR_NO_FILESYSTEM; /* (Invalid volume size) */
fmt = 0;
if (nclst <= MAX_FAT32) fmt = FS_FAT32;
if (nclst <= MAX_FAT16) fmt = FS_FAT16;
if (nclst <= MAX_FAT12) fmt = FS_FAT12;
if (fmt == 0) return FR_NO_FILESYSTEM;

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

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

fs->fs_type = fmt; /* FAT sub-type */
fs->id = ++Fsid; /* Volume mount ID */
#if FF_USE_LFN == 1
fs->lfnbuf = LfnBuf; /* Static LFN working buffer */
#if FF_FS_EXFAT
fs->dirbuf = DirBuf; /* Static directory block scratchpad buuffer */
#endif
#endif
#if FF_FS_RPATH != 0
fs->cdir = 0; /* Initialize current directory */
#endif
#if FF_FS_LOCK != 0 /* Clear file lock semaphores */
clear_lock(fs);
#endif
return FR_OK;
}

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

static FRESULT validate ( /* Returns FR_OK or FR_INVALID_OBJECT */
FFOBJID* obj, /* Pointer to the FFOBJID, the 1st member in the FIL/DIR object, to check validity */
FATFS** rfs /* Pointer to pointer to the owner filesystem object to return */
)
{
FRESULT res = FR_INVALID_OBJECT;

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

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

Public Functions (FatFs API)

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

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

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

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

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

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

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

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

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

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

if (!fp) return FR_INVALID_OBJECT;

/* Get logical drive number */
mode &= FF_FS_READONLY ? FA_READ : FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_CREATE_NEW | FA_OPEN_ALWAYS | FA_OPEN_APPEND;
res = find_volume(&path, &fs, mode);
if (res == FR_OK) {
dj.obj.fs = fs;
INIT_NAMBUF(fs);
res = follow_path(&dj, path); /* Follow the file path */
#if !FF_FS_READONLY /* Read/Write configuration */
if (res == FR_OK) {
if (dj.fn[NSFLAG] & NS_NONAME) { /* Origin directory itself? */
res = FR_INVALID_NAME;
}
#if FF_FS_LOCK != 0
else {
res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0); /* Check if the file can be used */
}
#endif
}
/* Create or Open a file */
if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
if (res != FR_OK) { /* No file, create new */
if (res == FR_NO_FILE) { /* There is no file to open, create a new entry */
#if FF_FS_LOCK != 0
res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
res = dir_register(&dj);
#endif
}
mode |= FA_CREATE_ALWAYS; /* File is created */
}
else { /* Any object with the same name is already existing */
if (dj.obj.attr & (AM_RDO | AM_DIR)) { /* Cannot overwrite it (R/O or DIR) */
res = FR_DENIED;
} else {
if (mode & FA_CREATE_NEW) res = FR_EXIST; /* Cannot create as new file */
}
}
if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) { /* Truncate the file if overwrite mode */
#if FF_FS_EXFAT
if (fs->fs_type == FS_EXFAT) {
/* Get current allocation info */
fp->obj.fs = fs;
init_alloc_info(fs, &fp->obj);
/* Set directory entry block initial state */
mem_set(fs->dirbuf + 2, 0, 30); /* Clear 85 entry except for NumSec */
mem_set(fs->dirbuf + 38, 0, 26); /* Clear C0 entry except for NumName and NameHash */
fs->dirbuf[XDIR_Attr] = AM_ARC;
st_dword(fs->dirbuf + XDIR_CrtTime, GET_FATTIME());
fs->dirbuf[XDIR_GenFlags] = 1;
res = store_xdir(&dj);
if (res == FR_OK && fp->obj.sclust != 0) { /* Remove the cluster chain if exist */
res = remove_chain(&fp->obj, fp->obj.sclust, 0);
fs->last_clst = fp->obj.sclust - 1; /* Reuse the cluster hole */
}
} else
#endif
{
/* Set directory entry initial state */
cl = ld_clust(fs, dj.dir); /* Get current cluster chain */
st_dword(dj.dir + DIR_CrtTime, GET_FATTIME()); /* Set created time */
dj.dir[DIR_Attr] = AM_ARC; /* Reset attribute */
st_clust(fs, dj.dir, 0); /* Reset file allocation info */
st_dword(dj.dir + DIR_FileSize, 0);
fs->wflag = 1;
if (cl != 0) { /* Remove the cluster chain if exist */
dw = fs->winsect;
res = remove_chain(&dj.obj, cl, 0);
if (res == FR_OK) {
res = move_window(fs, dw);
fs->last_clst = cl - 1; /* Reuse the cluster hole */
}
}
}
}
}
else { /* Open an existing file */
if (res == FR_OK) { /* Is the object exsiting? */
if (dj.obj.attr & AM_DIR) { /* File open against a directory */
res = FR_NO_FILE;
} else {
if ((mode & FA_WRITE) && (dj.obj.attr & AM_RDO)) { /* Write mode open against R/O file */
res = FR_DENIED;
}
}
}
}
if (res == FR_OK) {
if (mode & FA_CREATE_ALWAYS) mode |= FA_MODIFIED; /* Set file change flag if created or overwritten */
fp->dir_sect = fs->winsect; /* Pointer to the directory entry */
fp->dir_ptr = dj.dir;
#if FF_FS_LOCK != 0
fp->obj.lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0); /* Lock the file for this session */
if (fp->obj.lockid == 0) res = FR_INT_ERR;
#endif
}
#else /* R/O configuration */
if (res == FR_OK) {
if (dj.fn[NSFLAG] & NS_NONAME) { /* Is it origin directory itself? */
res = FR_INVALID_NAME;
} else {
if (dj.obj.attr & AM_DIR) { /* Is it a directory? */
res = FR_NO_FILE;
}
}
}
#endif

if (res == FR_OK) {
#if FF_FS_EXFAT
if (fs->fs_type == FS_EXFAT) {
fp->obj.c_scl = dj.obj.sclust; /* Get containing directory info */
fp->obj.c_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
fp->obj.c_ofs = dj.blk_ofs;
init_alloc_info(fs, &fp->obj);
} else
#endif
{
fp->obj.sclust = ld_clust(fs, dj.dir); /* Get object allocation info */
fp->obj.objsize = ld_dword(dj.dir + DIR_FileSize);
}
#if FF_USE_FASTSEEK
fp->cltbl = 0; /* Disable fast seek mode */
#endif
fp->obj.fs = fs; /* Validate the file object */
fp->obj.id = fs->id;
fp->flag = mode; /* Set file access mode */
fp->err = 0; /* Clear error flag */
fp->sect = 0; /* Invalidate current data sector */
fp->fptr = 0; /* Set file pointer top of the file */
#if !FF_FS_READONLY
#if !FF_FS_TINY
mem_set(fp->buf, 0, sizeof fp->buf); /* Clear sector buffer */
#endif
if ((mode & FA_SEEKEND) && fp->obj.objsize > 0) { /* Seek to end of file if FA_OPEN_APPEND is specified */
fp->fptr = fp->obj.objsize; /* Offset to seek */
bcs = (DWORD)fs->csize * SS(fs); /* Cluster size in byte */
clst = fp->obj.sclust; /* Follow the cluster chain */
for (ofs = fp->obj.objsize; res == FR_OK && ofs > bcs; ofs -= bcs) {
clst = get_fat(&fp->obj, clst);
if (clst <= 1) res = FR_INT_ERR;
if (clst == 0xFFFFFFFF) res = FR_DISK_ERR;
}
fp->clust = clst;
if (res == FR_OK && ofs % SS(fs)) { /* Fill sector buffer if not on the sector boundary */
if ((sc = clst2sect(fs, clst)) == 0) {
res = FR_INT_ERR;
} else {
fp->sect = sc + (DWORD)(ofs / SS(fs));
#if !FF_FS_TINY
if (disk_read(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) res = FR_DISK_ERR;
#endif
}
}
}
#endif
}

FREE_NAMBUF();
}

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

LEAVE_FF(fs, res);
}

/*-----------------------------------------------------------------------*/
/* Read File */
/*-----------------------------------------------------------------------*/

FRESULT f_read (
FIL* fp, /* Pointer to the file object */
void* buff, /* Pointer to data buffer */
UINT btr, /* Number of bytes to read */
UINT* br /* Pointer to number of bytes read */
)
{
FRESULT res;
FATFS *fs;
DWORD clst, sect;
FSIZE_t remain;
UINT rcnt, cc, csect;
BYTE *rbuff = (BYTE*)buff;

*br = 0; /* Clear read byte counter */
res = validate(&fp->obj, &fs); /* Check validity of the file object */
if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res); /* Check validity */
if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED); /* Check access mode */
remain = fp->obj.objsize - fp->fptr;
if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */

for ( ; btr; /* Repeat until btr bytes read */
btr -= rcnt, *br += rcnt, rbuff += rcnt, fp->fptr += rcnt) {
if (fp->fptr % SS(fs) == 0) { /* On the sector boundary? */
csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1)); /* Sector offset in the cluster */
if (csect == 0) { /* On the cluster boundary? */
if (fp->fptr == 0) { /* On the top of the file? */
clst = fp->obj.sclust; /* Follow cluster chain from the origin */
} else { /* Middle or end of the file */
#if FF_USE_FASTSEEK
if (fp->cltbl) {
clst = clmt_clust(fp, fp->fptr); /* Get cluster# from the CLMT */
} else
#endif
{
clst = get_fat(&fp->obj, fp->clust); /* Follow cluster chain on the FAT */
}
}
if (clst < 2) ABORT(fs, FR_INT_ERR);
if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
fp->clust = clst; /* Update current cluster */
}
sect = clst2sect(fs, fp->clust); /* Get current sector */
if (sect == 0) ABORT(fs, FR_INT_ERR);
sect += csect;
cc = btr / SS(fs); /* When remaining bytes >= sector size, */
if (cc > 0) { /* Read maximum contiguous sectors directly */
if (csect + cc > fs->csize) { /* Clip at cluster boundary */
cc = fs->csize - csect;
}
if (disk_read(fs->pdrv, rbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if !FF_FS_READONLY && FF_FS_MINIMIZE <= 2 /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if FF_FS_TINY
if (fs->wflag && fs->winsect - sect < cc) {
mem_cpy(rbuff + ((fs->winsect - sect) * SS(fs)), fs->win, SS(fs));
}
#else
if ((fp->flag & FA_DIRTY) && fp->sect - sect < cc) {
mem_cpy(rbuff + ((fp->sect - sect) * SS(fs)), fp->buf, SS(fs));
}
#endif
#endif
rcnt = SS(fs) * cc; /* Number of bytes transferred */
continue;
}
#if !FF_FS_TINY
if (fp->sect != sect) { /* Load data sector if not in cache */
#if !FF_FS_READONLY
if (fp->flag & FA_DIRTY) { /* Write-back dirty sector cache */
if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
fp->flag &= (BYTE)~FA_DIRTY;
}
#endif
if (disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR); /* Fill sector cache */
}
#endif
fp->sect = sect;
}
rcnt = SS(fs) - (UINT)fp->fptr % SS(fs); /* Number of bytes left in the sector */
if (rcnt > btr) rcnt = btr; /* Clip it by btr if needed */
#if FF_FS_TINY
if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR); /* Move sector window */
mem_cpy(rbuff, fs->win + fp->fptr % SS(fs), rcnt); /* Extract partial sector */
#else
mem_cpy(rbuff, fp->buf + fp->fptr % SS(fs), rcnt); /* Extract partial sector */
#endif
}

LEAVE_FF(fs, FR_OK);
}

#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Write File */
/*-----------------------------------------------------------------------*/

FRESULT f_write (
FIL* fp, /* Pointer to the file object */
const void* buff, /* Pointer to the data to be written */
UINT btw, /* Number of bytes to write */
UINT* bw /* Pointer to number of bytes written */
)
{
FRESULT res;
FATFS *fs;
DWORD clst, sect;
UINT wcnt, cc, csect;
const BYTE *wbuff = (const BYTE*)buff;

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

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

for ( ; btw; /* Repeat until all data written */
btw -= wcnt, *bw += wcnt, wbuff += wcnt, fp->fptr += wcnt, fp->obj.objsize = (fp->fptr > fp->obj.objsize) ? fp->fptr : fp->obj.objsize) {
if (fp->fptr % SS(fs) == 0) { /* On the sector boundary? */
csect = (UINT)(fp->fptr / SS(fs)) & (fs->csize - 1); /* Sector offset in the cluster */
if (csect == 0) { /* On the cluster boundary? */
if (fp->fptr == 0) { /* On the top of the file? */
clst = fp->obj.sclust; /* Follow from the origin */
if (clst == 0) { /* If no cluster is allocated, */
clst = create_chain(&fp->obj, 0); /* create a new cluster chain */
}
} else { /* On the middle or end of the file */
#if FF_USE_FASTSEEK
if (fp->cltbl) {
clst = clmt_clust(fp, fp->fptr); /* Get cluster# from the CLMT */
} else
#endif
{
clst = create_chain(&fp->obj, fp->clust); /* Follow or stretch cluster chain on the FAT */
}
}
if (clst == 0) break; /* Could not allocate a new cluster (disk full) */
if (clst == 1) ABORT(fs, FR_INT_ERR);
if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
fp->clust = clst; /* Update current cluster */
if (fp->obj.sclust == 0) fp->obj.sclust = clst; /* Set start cluster if the first write */
}
#if FF_FS_TINY
if (fs->winsect == fp->sect && sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR); /* Write-back sector cache */
#else
if (fp->flag & FA_DIRTY) { /* Write-back sector cache */
if (disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
fp->flag &= (BYTE)~FA_DIRTY;
}
#endif
sect = clst2sect(fs, fp->clust); /* Get current sector */
if (sect == 0) ABORT(fs, FR_INT_ERR);
sect += csect;
cc = btw / SS(fs); /* When remaining bytes >= sector size, */
if (cc > 0) { /* Write maximum contiguous sectors directly */
if (csect + cc > fs->csize) { /* Clip at cluster boundary */
cc = fs->csize - csect;
}
if (disk_write(fs->pdrv, wbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if FF_FS_MINIMIZE <= 2
#if FF_FS_TINY
if (fs->winsect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
mem_cpy(fs->win, wbuff + ((fs->winsect - sect) * SS(fs)), SS(fs));
fs->wflag = 0;
}
#else
if (fp->sect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
mem_cpy(fp->buf, wbuff + ((fp->sect - sect) * SS(fs)), SS(fs));
fp->flag &= (BYTE)~FA_DIRTY;
}
#endif
#endif
wcnt = SS(fs) * cc; /* Number of bytes transferred */
continue;
}
#if FF_FS_TINY
if (fp->fptr >= fp->obj.objsize) { /* Avoid silly cache filling on the growing edge */
if (sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);
fs->winsect = sect;
}
#else
if (fp->sect != sect && /* Fill sector cache with file data */
fp->fptr < fp->obj.objsize &&
disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) {
ABORT(fs, FR_DISK_ERR);
}
#endif
fp->sect = sect;
}
wcnt = SS(fs) - (UINT)fp->fptr % SS(fs); /* Number of bytes left in the sector */
if (wcnt > btw) wcnt = btw; /* Clip it by btw if needed */
#if FF_FS_TINY
if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR); /* Move sector window */
mem_cpy(fs->win + fp->fptr % SS(fs), wbuff, wcnt); /* Fit data to the sector */
fs->wflag = 1;
#else
mem_cpy(fp->buf + fp->fptr % SS(fs), wbuff, wcnt); /* Fit data to the sector */
fp->flag |= FA_DIRTY;
#endif
}

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

LEAVE_FF(fs, FR_OK);
}

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

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

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

INIT_NAMBUF(fs);
res = load_obj_xdir(&dj, &fp->obj); /* Load directory entry block */
if (res == FR_OK) {
fs->dirbuf[XDIR_Attr] |= AM_ARC; /* Set archive attribute to indicate that the file has been changed */
fs->dirbuf[XDIR_GenFlags] = fp->obj.stat | 1; /* Update file allocation information */
st_dword(fs->dirbuf + XDIR_FstClus, fp->obj.sclust);
st_qword(fs->dirbuf + XDIR_FileSize, fp->obj.objsize);
st_qword(fs->dirbuf + XDIR_ValidFileSize, fp->obj.objsize);
st_dword(fs->dirbuf + XDIR_ModTime, tm); /* Update modified time */
fs->dirbuf[XDIR_ModTime10] = 0;
st_dword(fs->dirbuf + XDIR_AccTime, 0);
res = store_xdir(&dj); /* Restore it to the directory */
if (res == FR_OK) {
res = sync_fs(fs);
fp->flag &= (BYTE)~FA_MODIFIED;
}
}
FREE_NAMBUF();
}
} else
#endif
{
res = move_window(fs, fp->dir_sect);
if (res == FR_OK) {
dir = fp->dir_ptr;
dir[DIR_Attr] |= AM_ARC; /* Set archive attribute to indicate that the file has been changed */
st_clust(fp->obj.fs, dir, fp->obj.sclust); /* Update file allocation information */
st_dword(dir + DIR_FileSize, (DWORD)fp->obj.objsize); /* Update file size */
st_dword(dir + DIR_ModTime, tm); /* Update modified time */
st_word(dir + DIR_LstAccDate, 0);
fs->wflag = 1;
res = sync_fs(fs); /* Restore it to the directory */
fp->flag &= (BYTE)~FA_MODIFIED;
}
}
}
}

LEAVE_FF(fs, res);
}

#endif /* !FF_FS_READONLY */

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

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

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

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

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

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

return FR_OK;
}

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

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

LEAVE_FF(fs, res);
}

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

/* Get logical drive */
buff[0] = 0; /* Set null string to get current volume */
res = find_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, nsect;
FSIZE_t ifptr;
#if FF_USE_FASTSEEK
DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;
#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 = find_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_matching(dp->pat, fno->fname, 0, 0)) break; /* Test for the file name */
#if FF_USE_LFN && FF_USE_FIND == 2
if (pattern_matching(dp->pat, fno->altname, 0, 0)) 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 = find_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, sect, stat;
UINT i;
FFOBJID obj;

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

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

LEAVE_FF(fs, res);
}

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

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

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

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

LEAVE_FF(fs, res);
}

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

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

/* Get logical drive */
res = find_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 = find_volume(&path, &fs, FA_WRITE); /* Get logical drive */
if (res == FR_OK) {
dj.obj.fs = fs;
INIT_NAMBUF(fs);
res = follow_path(&dj, path); /* Follow the file path */
if (res == FR_OK) res = FR_EXIST; /* Name collision? */
if (FF_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT)) { /* Invalid name? */
res = FR_INVALID_NAME;
}
if (res == FR_NO_FILE) { /* It is clear to create a new directory */
sobj.fs = fs; /* New object id to create a new chain */
dcl = create_chain(&sobj, 0); /* Allocate a cluster for the new directory */
res = FR_OK;
if (dcl == 0) res = FR_DENIED; /* No space to allocate a new cluster? */
if (dcl == 1) res = FR_INT_ERR; /* Any insanity? */
if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR; /* Disk error? */
tm = GET_FATTIME();
if (res == FR_OK) {
res = dir_clear(fs, dcl); /* Clean up the new table */
if (res == FR_OK) {
if (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) { /* Create dot entries (FAT only) */
mem_set(fs->win + DIR_Name, ' ', 11); /* Create "." entry */
fs->win[DIR_Name] = '.';
fs->win[DIR_Attr] = AM_DIR;
st_dword(fs->win + DIR_ModTime, tm);
st_clust(fs, fs->win, dcl);
mem_cpy(fs->win + SZDIRE, fs->win, SZDIRE); /* Create ".." entry */
fs->win[SZDIRE + 1] = '.'; pcl = dj.obj.sclust;
st_clust(fs, fs->win + SZDIRE, pcl);
fs->wflag = 1;
}
res = dir_register(&dj); /* Register the object to the parent directoy */
}
}
if (res == FR_OK) {
#if FF_FS_EXFAT
if (fs->fs_type == FS_EXFAT) { /* Initialize directory entry block */
st_dword(fs->dirbuf + XDIR_ModTime, tm); /* Created time */
st_dword(fs->dirbuf + XDIR_FstClus, dcl); /* Table start cluster */
st_dword(fs->dirbuf + XDIR_FileSize, (DWORD)fs->csize * SS(fs)); /* File 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;
DWORD dw;
DEF_NAMBUF

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

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

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

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

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

case FS_FAT32:
di = BS_VolID32; break;

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

LEAVE_FF(fs, res);
}

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

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

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

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

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

LEAVE_FF(fs, res);
}

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

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

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

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

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

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

LEAVE_FF(fs, res);
}

#endif /* FF_USE_EXPAND && !FF_FS_READONLY */

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

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

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

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

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

FRESULT f_mkfs (
const TCHAR* path, /* Logical drive number */
BYTE opt, /* Format option */
DWORD au, /* Size of allocation unit (cluster) [byte] */
void* work, /* Pointer to working buffer (null: use heap memory) */
UINT len /* Size of working buffer [byte] */
)
{
const UINT n_fats = 1; /* Number of FATs for FAT/FAT32 volume (1 or 2) */
const UINT n_rootdir = 512; /* Number of root directory entries for FAT volume */
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) */
BYTE fmt, sys, *buf, *pte, pdrv, part;
WORD ss; /* Sector size */
DWORD szb_buf, sz_buf, sz_blk, n_clst, pau, sect, nsect, n;
DWORD b_vol, b_fat, b_data; /* Base LBA for volume, fat, data */
DWORD sz_vol, sz_rsv, sz_fat, sz_dir; /* Size for volume, fat, dir, data */
UINT i;
int vol;
DSTATUS stat;
#if FF_USE_TRIM || FF_FS_EXFAT
DWORD tbl[3];
#endif

/* 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 volume if mounted */
pdrv = LD2PD(vol); /* Physical drive */
part = LD2PT(vol); /* Partition (0:create as new, 1-4:get from partition table) */

/* Check physical drive status */
stat = disk_initialize(pdrv);
if (stat & STA_NOINIT) return FR_NOT_READY;
if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
if (disk_ioctl(pdrv, GET_BLOCK_SIZE, &sz_blk) != RES_OK || !sz_blk || sz_blk > 32768 || (sz_blk & (sz_blk - 1))) sz_blk = 1; /* Erase block to align data area */
#if FF_MAX_SS != FF_MIN_SS /* Get sector size of the medium if variable sector size cfg. */
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
if ((au != 0 && au < ss) || au > 0x1000000 || (au & (au - 1))) return FR_INVALID_PARAMETER; /* Check if au is valid */
au /= ss; /* Cluster size in unit of sector */

/* Get working buffer */
#if FF_USE_LFN == 3
if (!work) { /* Use heap memory for working buffer */
for (szb_buf = MAX_MALLOC, buf = 0; szb_buf >= ss && (buf = ff_memalloc(szb_buf)) == 0; szb_buf /= 2) ;
sz_buf = szb_buf / ss; /* Size of working buffer (sector) */
} else
#endif
{
buf = (BYTE*)work; /* Working buffer */
sz_buf = len / ss; /* Size of working buffer (sector) */
szb_buf = sz_buf * ss; /* Size of working buffer (byte) */
}
if (!buf || sz_buf == 0) return FR_NOT_ENOUGH_CORE;

/* Determine where the volume to be located (b_vol, sz_vol) */
if (FF_MULTI_PARTITION && part != 0) {
/* Get partition information from partition table in the MBR */
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 */
pte = buf + (MBR_Table + (part - 1) * SZ_PTE);
if (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 {
/* Create a single-partition in this function */
if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_vol) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
b_vol = (opt & FM_SFD) ? 0 : 63; /* Volume start sector */
if (sz_vol < b_vol) LEAVE_MKFS(FR_MKFS_ABORTED);
sz_vol -= b_vol; /* Volume size */
}
if (sz_vol < 128) LEAVE_MKFS(FR_MKFS_ABORTED); /* Check if volume size is >=128s */

/* Pre-determine the FAT type */
do {
if (FF_FS_EXFAT && (opt & FM_EXFAT)) { /* exFAT possible? */
if ((opt & FM_ANY) == FM_EXFAT || sz_vol >= 0x4000000 || au > 128) { /* exFAT only, vol >= 64Ms or au > 128s ? */
fmt = FS_EXFAT; break;
}
}
if (au > 128) LEAVE_MKFS(FR_INVALID_PARAMETER); /* Too large au for FAT/FAT32 */
if (opt & FM_FAT32) { /* FAT32 possible? */
if ((opt & FM_ANY) == FM_FAT32 || !(opt & FM_FAT)) { /* FAT32 only or no-FAT? */
fmt = FS_FAT32; break;
}
}
if (!(opt & FM_FAT)) LEAVE_MKFS(FR_INVALID_PARAMETER); /* no-FAT? */
fmt = FS_FAT16;
} while (0);

#if FF_FS_EXFAT
if (fmt == FS_EXFAT) { /* Create an exFAT volume */
DWORD szb_bit, szb_case, sum, nb, cl;
WCHAR ch, si;
UINT j, st;
BYTE b;

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

/* Create a compressed up-case table */
sect = b_data + au * tbl[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 */
}
st = 1; /* Do not compress short run */
/* go to next case */
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 == szb_buf) { /* 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);
tbl[1] = (szb_case + au * ss - 1) / (au * ss); /* Number of up-case table clusters */
tbl[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 sectors */
nb = tbl[0] + tbl[1] + tbl[2]; /* Number of clusters in-use by system */
do {
mem_set(buf, 0, szb_buf);
for (i = 0; nb >= 8 && i < szb_buf; buf[i++] = 0xFF, nb -= 8) ;
for (b = 1; nb != 0 && i < szb_buf; buf[i] |= b, b <<= 1, nb--) ;
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 = nb = cl = 0;
do {
mem_set(buf, 0, szb_buf); i = 0; /* Clear work area and reset write index */
if (cl == 0) { /* Set entry 0 and 1 */
st_dword(buf + i, 0xFFFFFFF8); i += 4; cl++;
st_dword(buf + i, 0xFFFFFFFF); i += 4; cl++;
}
do { /* Create chains of bitmap, up-case and root dir */
while (nb != 0 && i < szb_buf) { /* Create a chain */
st_dword(buf + i, (nb > 1) ? cl + 1 : 0xFFFFFFFF);
i += 4; cl++; nb--;
}
if (nb == 0 && j < 3) nb = tbl[j++]; /* Next chain */
} while (nb != 0 && i < szb_buf);
n = (nsect > sz_buf) ? sz_buf : nsect; /* Write the buffered data */
if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
sect += n; nsect -= n;
} while (nsect);

/* Initialize the root directory */
mem_set(buf, 0, szb_buf);
buf[SZDIRE * 0 + 0] = ET_VLABEL; /* Volume label entry */
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 + tbl[0]); /* cluster */
st_dword(buf + SZDIRE * 2 + 24, szb_case); /* size */
sect = b_data + au * (tbl[0] + tbl[1]); nsect = au; /* Start of the root directory and number of sectors */
do { /* Fill root directory sectors */
n = (nsect > sz_buf) ? sz_buf : nsect;
if (disk_write(pdrv, buf, sect, n) != RES_OK) LEAVE_MKFS(FR_DISK_ERR);
mem_set(buf, 0, ss);
sect += n; nsect -= n;
} while (nsect);

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

} else
#endif /* FF_FS_EXFAT */
{ /* Create an FAT/FAT32 volume */
do {
pau = au;
/* Pre-determine number of clusters and FAT sub-type */
if (fmt == FS_FAT32) { /* FAT32 volume */
if (pau == 0) { /* au auto-selection */
n = 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 = 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 = 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 = sz_vol / pau;
if (n_clst > MAX_FAT12) {
n = n_clst * 2 + 4; /* FAT size [byte] */
} else {
fmt = 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_rootdir * SZDIRE / ss; /* Rootdir size [sector] */
}
b_fat = b_vol + sz_rsv; /* FAT base */
b_data = b_fat + sz_fat * n_fats + sz_dir; /* Data base */

/* Align data base to erase block boundary (for flash memory media) */
n = ((b_data + sz_blk - 1) & ~(sz_blk - 1)) - b_data; /* Next nearest erase block from current data base */
if (fmt == FS_FAT32) { /* FAT32: Move FAT base */
sz_rsv += n; b_fat += n;
} else { /* FAT: Expand FAT size */
sz_fat += n / n_fats;
}

/* 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 = (sz_vol - sz_rsv - sz_fat * n_fats - sz_dir) / pau;
if (fmt == FS_FAT32) {
if (n_clst <= MAX_FAT16) { /* Too few clusters for FAT32 */
if (au == 0 && (au = pau / 2) != 0) continue; /* Adjust cluster size and retry */
LEAVE_MKFS(FR_MKFS_ABORTED);
}
}
if (fmt == FS_FAT16) {
if (n_clst > MAX_FAT16) { /* Too many clusters for FAT16 */
if (au == 0 && (pau * 2) <= 64) {
au = pau * 2; continue; /* Adjust cluster size and retry */
}
if ((opt & FM_FAT32)) {
fmt = FS_FAT32; continue; /* Switch type to FAT32 and retry */
}
if (au == 0 && (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 (au == 0 && (au = pau * 2) <= 128) continue; /* Adjust cluster size and retry */
LEAVE_MKFS(FR_MKFS_ABORTED);
}
}
if (fmt == 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
tbl[0] = b_vol; tbl[1] = b_vol + sz_vol - 1; /* Inform the device the volume area can be erased */
disk_ioctl(pdrv, CTRL_TRIM, tbl);
#endif
/* Create FAT VBR */
mem_set(buf, 0, ss);
mem_cpy(buf + BS_JmpBoot, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code (x86), OEM name */
st_word(buf + BPB_BytsPerSec, ss); /* Sector size [byte] */
buf[BPB_SecPerClus] = (BYTE)pau; /* Cluster size [sector] */
st_word(buf + BPB_RsvdSecCnt, (WORD)sz_rsv); /* Size of reserved area */
buf[BPB_NumFATs] = (BYTE)n_fats; /* Number of FATs */
st_word(buf + BPB_RootEntCnt, (WORD)((fmt == FS_FAT32) ? 0 : n_rootdir)); /* 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, 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, b_vol); /* Volume offset in the physical drive [sector] */
if (fmt == FS_FAT32) {
st_dword(buf + BS_VolID32, GET_FATTIME()); /* VSN */
st_dword(buf + BPB_FATSz32, sz_fat); /* FAT size [sector] */
st_dword(buf + BPB_RootClus32, 2); /* Root directory cluster # (2) */
st_word(buf + BPB_FSInfo32, 1); /* Offset of FSINFO sector (VBR + 1) */
st_word(buf + BPB_BkBootSec32, 6); /* Offset of backup VBR (VBR + 6) */
buf[BS_DrvNum32] = 0x80; /* Drive number (for int13) */
buf[BS_BootSig32] = 0x29; /* Extended boot signature */
mem_cpy(buf + BS_VolLab32, "NO NAME " "FAT32 ", 19); /* Volume label, FAT signature */
} else {
st_dword(buf + BS_VolID, GET_FATTIME()); /* VSN */
st_word(buf + BPB_FATSz16, (WORD)sz_fat); /* FAT size [sector] */
buf[BS_DrvNum] = 0x80; /* Drive number (for int13) */
buf[BS_BootSig] = 0x29; /* Extended boot signature */
mem_cpy(buf + BS_VolLab, "NO NAME " "FAT ", 19); /* Volume label, FAT signature */
}
st_word(buf + BS_55AA, 0xAA55); /* Signature (offset is fixed here regardless of sector size) */
if (disk_write(pdrv, buf, b_vol, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR); /* Write it to the VBR sector */

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

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

/* Initialize root directory (fill with zero) */
nsect = (fmt == 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);
}

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

/* Update partition information */
if (FF_MULTI_PARTITION && part != 0) { /* Created in the existing partition */
/* 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 + (part - 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 { /* Created as a new single partition */
if (!(opt & FM_SFD)) { /* Create partition table if in FDISK format */
mem_set(buf, 0, ss);
st_word(buf + BS_55AA, 0xAA55); /* MBR signature */
pte = buf + MBR_Table; /* Create partition table for single partition in the drive */
pte[PTE_Boot] = 0; /* Boot indicator */
pte[PTE_StHead] = 1; /* Start head */
pte[PTE_StSec] = 1; /* Start sector */
pte[PTE_StCyl] = 0; /* Start cylinder */
pte[PTE_System] = sys; /* System type */
n = (b_vol + sz_vol) / (63 * 255); /* (End CHS may be invalid) */
pte[PTE_EdHead] = 254; /* End head */
pte[PTE_EdSec] = (BYTE)(((n >> 2) & 0xC0) | 63); /* End sector */
pte[PTE_EdCyl] = (BYTE)n; /* End cylinder */
st_dword(pte + PTE_StLba, b_vol); /* Start offset in LBA */
st_dword(pte + PTE_SizLba, sz_vol); /* Size in sectors */
if (disk_write(pdrv, buf, 0, 1) != RES_OK) LEAVE_MKFS(FR_DISK_ERR); /* Write it to the MBR */
}
}

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 DWORD* szt, /* Pointer to the size table for each partitions */
void* work /* Pointer to the working buffer (null: use heap memory) */
)
{
UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
BYTE s_hd, e_hd, *p, *buf = (BYTE*)work;
DSTATUS stat;
DWORD sz_disk, sz_part, s_part;
FRESULT res;

stat = disk_initialize(pdrv);
if (stat & STA_NOINIT) return FR_NOT_READY;
if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;

buf = (BYTE*)work;
#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;

/* Determine the CHS without any consideration of the drive geometry */
for (n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
if (n == 256) n--;
e_hd = (BYTE)(n - 1);
sz_cyl = 63 * n;
tot_cyl = sz_disk / sz_cyl;

/* Create partition table */
mem_set(buf, 0, FF_MAX_SS);
p = buf + MBR_Table; b_cyl = 0;
for (i = 0; i < 4; i++, p += SZ_PTE) {
p_cyl = (szt[i] <= 100U) ? (DWORD)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl; /* Number of cylinders */
if (p_cyl == 0) continue;
s_part = (DWORD)sz_cyl * b_cyl;
sz_part = (DWORD)sz_cyl * p_cyl;
if (i == 0) { /* Exclude first track of cylinder 0 */
s_hd = 1;
s_part += 63; sz_part -= 63;
} else {
s_hd = 0;
}
e_cyl = b_cyl + p_cyl - 1; /* End cylinder */
if (e_cyl >= tot_cyl) LEAVE_MKFS(FR_INVALID_PARAMETER);

/* Set partition table */
p[1] = s_hd; /* Start head */
p[2] = (BYTE)(((b_cyl >> 2) & 0xC0) | 1); /* Start sector */
p[3] = (BYTE)b_cyl; /* Start cylinder */
p[4] = 0x07; /* System type (temporary setting) */
p[5] = e_hd; /* End head */
p[6] = (BYTE)(((e_cyl >> 2) & 0xC0) | 63); /* End sector */
p[7] = (BYTE)e_cyl; /* End cylinder */
st_dword(p + 8, s_part); /* Start sector in LBA */
st_dword(p + 12, sz_part); /* Number of sectors */

/* Next partition */
b_cyl += p_cyl;
}
st_word(p, 0xAA55); /* MBR signature (always at offset 510) */

/* Write it to the MBR */
res = (disk_write(pdrv, buf, 0, 1) == RES_OK && disk_ioctl(pdrv, CTRL_SYNC, 0) == RES_OK) ? FR_OK : FR_DISK_ERR;
LEAVE_MKFS(res);
}

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

#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 string buffer to read */
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);
if (rc != 1) break;
wc = s[0];
if (dbc_1st((BYTE)wc)) {
f_read(fp, s, 1, &rc);
if (rc != 1 || !dbc_2nd(s[0])) continue;
wc = wc << 8 | s[0];
}
dc = ff_oem2uni(wc, CODEPAGE);
if (dc == 0) continue;
#elif FF_STRF_ENCODE == 1 || FF_STRF_ENCODE == 2 /* Read a character in UTF-16LE/BE */
f_read(fp, s, 2, &rc);
if (rc != 2) break;
dc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
if (IsSurrogateL(dc)) continue;
if (IsSurrogateH(dc)) {
f_read(fp, s, 2, &rc);
if (rc != 2) break;
wc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
if (!IsSurrogateL(wc)) continue;
dc = ((dc & 0x3FF) + 0x40) << 10 | (wc & 0x3FF);
}
#else /* Read a character in UTF-8 */
f_read(fp, s, 1, &rc);
if (rc != 1) break;
dc = s[0];
if (dc >= 0x80) { /* Multi-byte character? */
ct = 0;
if ((dc & 0xE0) == 0xC0) { dc &= 0x1F; ct = 1; } /* 2-byte? */
if ((dc & 0xF0) == 0xE0) { dc &= 0x0F; ct = 2; } /* 3-byte? */
if ((dc & 0xF8) == 0xF0) { dc &= 0x07; ct = 3; } /* 4-byte? */
if (ct == 0) continue;
f_read(fp, s, ct, &rc); /* Get trailing bytes */
if (rc != ct) break;
rc = 0;
do { /* Merge trailing bytes */
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
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) { /* 1-byte */
*p++ = (TCHAR)dc;
nc++;
if (dc == '\n') break; /* End of line? */
} else {
if (dc < 0x800) { /* 2-byte */
*p++ = (TCHAR)(0xC0 | (dc >> 6 & 0x1F));
*p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
nc += 2;
} else {
if (dc < 0x10000) { /* 3-byte */
*p++ = (TCHAR)(0xE0 | (dc >> 12 & 0x0F));
*p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
*p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
nc += 3;
} else { /* 4-byte */
*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 without any conversion (ANSI/OEM API) */
len -= 1; /* Make a room for the terminator */
while (nc < len) {
f_read(fp, s, 1, &rc);
if (rc != 1) break;
dc = s[0];
if (FF_USE_STRFUNC == 2 && dc == '\r') continue;
*p++ = (TCHAR)dc; nc++;
if (dc == '\n') break;
}
#endif

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

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

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

static void putc_bfd ( /* Buffered write with code conversion */
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;
TCHAR *tp;
#endif
#endif

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

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

#if FF_USE_LFN && FF_LFN_UNICODE
#if FF_LFN_UNICODE == 1 /* UTF-16 input */
if (IsSurrogateH(c)) {
pb->hs = c; return;
}
hs = pb->hs; pb->hs = 0;
if (hs != 0) {
if (!IsSurrogateL(c)) hs = 0;
} else {
if (IsSurrogateL(c)) return;
}
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; /* 1-byte? */
if (((BYTE)c & 0xE0) == 0xC0) pb->ct = 1; /* 2-byte? */
if (((BYTE)c & 0xF0) == 0xE0) pb->ct = 2; /* 3-byte? */
if (((BYTE)c & 0xF1) == 0xF0) pb->ct = 3; /* 4-byte? */
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 = (TCHAR*)pb->bs;
dc = tchar2uni(&tp); /* UTF-8 ==> UTF-16 */
if (dc == 0xFFFFFFFF) return;
wc = (WCHAR)dc;
hs = (WCHAR)(dc >> 16);
#elif FF_LFN_UNICODE == 3 /* UTF-32 input */
if (IsSurrogate(c) || c >= 0x110000) return;
if (c >= 0x10000) {
hs = (WCHAR)(0xD800 | ((c >> 10) - 0x40)); /* Make high surrogate */
wc = 0xDC00 | (c & 0x3FF); /* Make low surrogate */
} else {
hs = 0;
wc = (WCHAR)c;
}
#endif

#if FF_STRF_ENCODE == 1 /* Write a character in UTF-16LE */
if (hs != 0) {
st_word(&pb->buf[i], hs);
i += 2;
nc++;
}
st_word(&pb->buf[i], wc);
i += 2;
#elif FF_STRF_ENCODE == 2 /* Write a character in UTF-16BE */
if (hs != 0) {
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 it in UTF-8 */
if (hs != 0) { /* 4-byte */
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) { /* 1-byte */
pb->buf[i++] = (BYTE)wc;
} else {
if (wc < 0x800) { /* 2-byte */
nc += 1;
pb->buf[i++] = (BYTE)(0xC0 | wc >> 6);
} else { /* 3-byte */
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 it 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-encode) */
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;
}

static int putc_flush ( /* Flush left characters in the buffer */
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 EOF;
}

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

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

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

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

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

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

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

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

putc_init(&pb, fp);

va_start(arp, fmt);

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

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

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

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

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

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

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

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

va_end(arp);

return putc_flush(&pb);
}

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

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

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

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

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

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(root)/tools/src/dmimg/ff.c – Rev 129