ff.c

00001 /*----------------------------------------------------------------------------/
00002 /  FatFs - FAT file system module  R0.08a                 (C)ChaN, 2010
00003 /-----------------------------------------------------------------------------/
00004 / FatFs module is a generic FAT file system module for small embedded systems.
00005 / This is a free software that opened for education, research and commercial
00006 / developments under license policy of following terms.
00007 /
00008 /  Copyright (C) 2010, ChaN, all right reserved.
00009 /
00010 / * The FatFs module is a free software and there is NO WARRANTY.
00011 / * No restriction on use. You can use, modify and redistribute it for
00012 /   personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
00013 / * Redistributions of source code must retain the above copyright notice.
00014 /
00015 /-----------------------------------------------------------------------------/
00016 / Feb 26,'06 R0.00  Prototype.
00017 /
00018 / Apr 29,'06 R0.01  First stable version.
00019 /
00020 / Jun 01,'06 R0.02  Added FAT12 support.
00021 /                   Removed unbuffered mode.
00022 /                   Fixed a problem on small (<32M) partition.
00023 / Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
00024 /
00025 / Sep 22,'06 R0.03  Added f_rename().
00026 /                   Changed option _FS_MINIMUM to _FS_MINIMIZE.
00027 / Dec 11,'06 R0.03a Improved cluster scan algorithm to write files fast.
00028 /                   Fixed f_mkdir() creates incorrect directory on FAT32.
00029 /
00030 / Feb 04,'07 R0.04  Supported multiple drive system.
00031 /                   Changed some interfaces for multiple drive system.
00032 /                   Changed f_mountdrv() to f_mount().
00033 /                   Added f_mkfs().
00034 / Apr 01,'07 R0.04a Supported multiple partitions on a physical drive.
00035 /                   Added a capability of extending file size to f_lseek().
00036 /                   Added minimization level 3.
00037 /                   Fixed an endian sensitive code in f_mkfs().
00038 / May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
00039 /                   Added FSInfo support.
00040 /                   Fixed DBCS name can result FR_INVALID_NAME.
00041 /                   Fixed short seek (<= csize) collapses the file object.
00042 /
00043 / Aug 25,'07 R0.05  Changed arguments of f_read(), f_write() and f_mkfs().
00044 /                   Fixed f_mkfs() on FAT32 creates incorrect FSInfo.
00045 /                   Fixed f_mkdir() on FAT32 creates incorrect directory.
00046 / Feb 03,'08 R0.05a Added f_truncate() and f_utime().
00047 /                   Fixed off by one error at FAT sub-type determination.
00048 /                   Fixed btr in f_read() can be mistruncated.
00049 /                   Fixed cached sector is not flushed when create and close without write.
00050 /
00051 / Apr 01,'08 R0.06  Added fputc(), fputs(), fprintf() and fgets().
00052 /                   Improved performance of f_lseek() on moving to the same or following cluster.
00053 /
00054 / Apr 01,'09 R0.07  Merged Tiny-FatFs as a buffer configuration option. (_FS_TINY)
00055 /                   Added long file name support.
00056 /                   Added multiple code page support.
00057 /                   Added re-entrancy for multitask operation.
00058 /                   Added auto cluster size selection to f_mkfs().
00059 /                   Added rewind option to f_readdir().
00060 /                   Changed result code of critical errors.
00061 /                   Renamed string functions to avoid name collision.
00062 / Apr 14,'09 R0.07a Separated out OS dependent code on reentrant cfg.
00063 /                   Added multiple sector size support.
00064 / Jun 21,'09 R0.07c Fixed f_unlink() can return FR_OK on error.
00065 /                   Fixed wrong cache control in f_lseek().
00066 /                   Added relative path feature.
00067 /                   Added f_chdir() and f_chdrive().
00068 /                   Added proper case conversion to extended char.
00069 / Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h.
00070 /                   Fixed f_unlink() fails to remove a sub-dir on _FS_RPATH.
00071 /                   Fixed name matching error on the 13 char boundary.
00072 /                   Added a configuration option, _LFN_UNICODE.
00073 /                   Changed f_readdir() to return the SFN with always upper case on non-LFN cfg.
00074 /
00075 / May 15,'10 R0.08  Added a memory configuration option. (_USE_LFN = 3)
00076 /                   Added file lock feature. (_FS_SHARE)
00077 /                   Added fast seek feature. (_USE_FASTSEEK)
00078 /                   Changed some types on the API, XCHAR->TCHAR.
00079 /                   Changed fname member in the FILINFO structure on Unicode cfg.
00080 /                   String functions support UTF-8 encoding files on Unicode cfg.
00081 / Aug 16,'10 R0.08a Added f_getcwd(). (_FS_RPATH = 2)
00082 /                   Added sector erase feature. (_USE_ERASE)
00083 /                   Moved file lock semaphore table from fs object to the bss.
00084 /                   Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'.
00085 /                   Fixed f_mkfs() creates wrong FAT32 volume.
00086 /---------------------------------------------------------------------------*/
00087 
00088 #include "ff.h"            /* FatFs configurations and declarations */
00089 #include "diskio.h"        /* Declarations of low level disk I/O functions */
00090 
00091 
00092 /*--------------------------------------------------------------------------
00093 
00094    Module Private Definitions
00095 
00096 ---------------------------------------------------------------------------*/
00097 
00098 #if _FATFS != 8255
00099 #error Wrong include file (ff.h).
00100 #endif
00101 
00102 /* Definitions on sector size */
00103 #if _MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096
00104 #error Wrong sector size.
00105 #endif
00106 #if _MAX_SS != 512
00107 #define    SS(fs)    ((fs)->ssize)    /* Multiple sector size */
00108 #else
00109 #define    SS(fs)    512U            /* Fixed sector size */
00110 #endif
00111 
00112 
00113 /* Reentrancy related */
00114 #if _FS_REENTRANT
00115 #if _USE_LFN == 1
00116 #error Static LFN work area must not be used in re-entrant configuration.
00117 #endif
00118 #define    ENTER_FF(fs)        { if (!lock_fs(fs)) return FR_TIMEOUT; }
00119 #define    LEAVE_FF(fs, res)    { unlock_fs(fs, res); return res; }
00120 #else
00121 #define    ENTER_FF(fs)
00122 #define LEAVE_FF(fs, res)    return res
00123 #endif
00124 
00125 #define    ABORT(fs, res)        { fp->flag |= FA__ERROR; LEAVE_FF(fs, res); }
00126 
00127 
00128 /* File shareing feature */
00129 #if _FS_SHARE
00130 #if _FS_READONLY
00131 #error _FS_SHARE must be 0 on read-only cfg.
00132 #endif
00133 typedef struct {
00134     FATFS *fs;                /* File ID 1, volume (NULL:blank entry) */
00135     DWORD clu;                /* File ID 2, directory */
00136     WORD idx;                /* File ID 3, directory index */
00137     WORD ctr;                /* File open counter, 0:none, 0x01..0xFF:read open count, 0x100:write mode */
00138 } FILESEM;
00139 #endif
00140 
00141 
00142 /* Misc definitions */
00143 #define LD_CLUST(dir)    (((DWORD)LD_WORD(dir+DIR_FstClusHI)<<16) | LD_WORD(dir+DIR_FstClusLO))
00144 #define ST_CLUST(dir,cl) {ST_WORD(dir+DIR_FstClusLO, cl); ST_WORD(dir+DIR_FstClusHI, (DWORD)cl>>16);}
00145 
00146 
00147 /* Character code support macros */
00148 #define IsUpper(c)    (((c)>='A')&&((c)<='Z'))
00149 #define IsLower(c)    (((c)>='a')&&((c)<='z'))
00150 #define IsDigit(c)    (((c)>='0')&&((c)<='9'))
00151 
00152 #if _DF1S        /* Code page is DBCS */
00153 
00154 #ifdef _DF2S    /* Two 1st byte areas */
00155 #define IsDBCS1(c)    (((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E) || ((BYTE)(c) >= _DF2S && (BYTE)(c) <= _DF2E))
00156 #else            /* One 1st byte area */
00157 #define IsDBCS1(c)    ((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E)
00158 #endif
00159 
00160 #ifdef _DS3S    /* Three 2nd byte areas */
00161 #define IsDBCS2(c)    (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E) || ((BYTE)(c) >= _DS3S && (BYTE)(c) <= _DS3E))
00162 #else            /* Two 2nd byte areas */
00163 #define IsDBCS2(c)    (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E))
00164 #endif
00165 
00166 #else            /* Code page is SBCS */
00167 
00168 #define IsDBCS1(c)    0
00169 #define IsDBCS2(c)    0
00170 
00171 #endif /* _DF1S */
00172 
00173 
00174 /* Name status flags */
00175 #define NS            11        /* Offset of name status byte */
00176 #define NS_LOSS        0x01    /* Out of 8.3 format */
00177 #define NS_LFN        0x02    /* Force to create LFN entry */
00178 #define NS_LAST        0x04    /* Last segment */
00179 #define NS_BODY        0x08    /* Lower case flag (body) */
00180 #define NS_EXT        0x10    /* Lower case flag (ext) */
00181 #define NS_DOT        0x20    /* Dot entry */
00182 
00183 
00184 /* FAT sub-type boundaries */
00185 /* Note that the FAT spec by Microsoft says 4085 but Windows works with 4087! */
00186 #define MIN_FAT16    4086    /* Minimum number of clusters for FAT16 */
00187 #define    MIN_FAT32    65526    /* Minimum number of clusters for FAT32 */
00188 
00189 
00190 /* FatFs refers the members in the FAT structures as byte array instead of
00191 / structure member because there are incompatibility of the packing option
00192 / between compilers. */
00193 
00194 #define BS_jmpBoot            0
00195 #define BS_OEMName            3
00196 #define BPB_BytsPerSec        11
00197 #define BPB_SecPerClus        13
00198 #define BPB_RsvdSecCnt        14
00199 #define BPB_NumFATs            16
00200 #define BPB_RootEntCnt        17
00201 #define BPB_TotSec16        19
00202 #define BPB_Media            21
00203 #define BPB_FATSz16            22
00204 #define BPB_SecPerTrk        24
00205 #define BPB_NumHeads        26
00206 #define BPB_HiddSec            28
00207 #define BPB_TotSec32        32
00208 #define BS_DrvNum            36
00209 #define BS_BootSig            38
00210 #define BS_VolID            39
00211 #define BS_VolLab            43
00212 #define BS_FilSysType        54
00213 #define BPB_FATSz32            36
00214 #define BPB_ExtFlags        40
00215 #define BPB_FSVer            42
00216 #define BPB_RootClus        44
00217 #define BPB_FSInfo            48
00218 #define BPB_BkBootSec        50
00219 #define BS_DrvNum32            64
00220 #define BS_BootSig32        66
00221 #define BS_VolID32            67
00222 #define BS_VolLab32            71
00223 #define BS_FilSysType32        82
00224 #define    FSI_LeadSig            0
00225 #define    FSI_StrucSig        484
00226 #define    FSI_Free_Count        488
00227 #define    FSI_Nxt_Free        492
00228 #define MBR_Table            446
00229 #define BS_55AA                510
00230 
00231 #define    DIR_Name            0
00232 #define    DIR_Attr            11
00233 #define    DIR_NTres            12
00234 #define    DIR_CrtTime            14
00235 #define    DIR_CrtDate            16
00236 #define    DIR_FstClusHI        20
00237 #define    DIR_WrtTime            22
00238 #define    DIR_WrtDate            24
00239 #define    DIR_FstClusLO        26
00240 #define    DIR_FileSize        28
00241 #define    LDIR_Ord            0
00242 #define    LDIR_Attr            11
00243 #define    LDIR_Type            12
00244 #define    LDIR_Chksum            13
00245 #define    LDIR_FstClusLO        26
00246 
00247 
00248 
00249 /*------------------------------------------------------------*/
00250 /* Work area                                                  */
00251 
00252 #if _VOLUMES
00253 static
00254 FATFS *FatFs[_VOLUMES];    /* Pointer to the file system objects (logical drives) */
00255 #else
00256 #error Number of drives must not be 0.
00257 #endif
00258 
00259 static
00260 WORD Fsid;                /* File system mount ID */
00261 
00262 #if _FS_RPATH
00263 static
00264 BYTE CurrVol;            /* Current drive */
00265 #endif
00266 
00267 #if _FS_SHARE
00268 static
00269 FILESEM    Files[_FS_SHARE];    /* File lock semaphores */
00270 #endif
00271 
00272 #if _USE_LFN == 0            /* No LFN */
00273 #define    DEF_NAMEBUF            BYTE sfn[12]
00274 #define INIT_BUF(dobj)        (dobj).fn = sfn
00275 #define    FREE_BUF()
00276 
00277 #elif _USE_LFN == 1            /* LFN with static LFN working buffer */
00278 static WCHAR LfnBuf[_MAX_LFN+1];
00279 #define    DEF_NAMEBUF            BYTE sfn[12]
00280 #define INIT_BUF(dobj)        { (dobj).fn = sfn; (dobj).lfn = LfnBuf; }
00281 #define    FREE_BUF()
00282 
00283 #elif _USE_LFN == 2         /* LFN with dynamic LFN working buffer on the stack */
00284 #define    DEF_NAMEBUF            BYTE sfn[12]; WCHAR lbuf[_MAX_LFN+1]
00285 #define INIT_BUF(dobj)        { (dobj).fn = sfn; (dobj).lfn = lbuf; }
00286 #define    FREE_BUF()
00287 
00288 #elif _USE_LFN == 3         /* LFN with dynamic LFN working buffer on the heap */
00289 #define    DEF_NAMEBUF            BYTE sfn[12]; WCHAR *lfn
00290 #define INIT_BUF(dobj)        { lfn = ff_memalloc((_MAX_LFN + 1) * 2); \
00291                               if (!lfn) LEAVE_FF((dobj).fs, FR_NOT_ENOUGH_CORE); \
00292                               (dobj).lfn = lfn;    (dobj).fn = sfn; }
00293 #define    FREE_BUF()            ff_memfree(lfn)
00294 
00295 #else
00296 #error Wrong LFN configuration.
00297 #endif
00298 
00299 
00300 
00301 
00302 /*--------------------------------------------------------------------------
00303 
00304    Module Private Functions
00305 
00306 ---------------------------------------------------------------------------*/
00307 
00308 
00309 /*-----------------------------------------------------------------------*/
00310 /* String functions                                                      */
00311 /*-----------------------------------------------------------------------*/
00312 
00313 /* Copy memory to memory */
00314 static
00315 void mem_cpy (void* dst, const void* src, UINT cnt) {
00316     BYTE *d = (BYTE*)dst;
00317     const BYTE *s = (const BYTE*)src;
00318 
00319 #if _WORD_ACCESS == 1
00320     while (cnt >= sizeof(int)) {
00321         *(int*)d = *(int*)s;
00322         d += sizeof(int); s += sizeof(int);
00323         cnt -= sizeof(int);
00324     }
00325 #endif
00326     while (cnt--)
00327         *d++ = *s++;
00328 }
00329 
00330 /* Fill memory */
00331 static
00332 void mem_set (void* dst, int val, UINT cnt) {
00333     BYTE *d = (BYTE*)dst;
00334 
00335     while (cnt--)
00336         *d++ = (BYTE)val;
00337 }
00338 
00339 /* Compare memory to memory */
00340 static
00341 int mem_cmp (const void* dst, const void* src, UINT cnt) {
00342     const BYTE *d = (const BYTE *)dst, *s = (const BYTE *)src;
00343     int r = 0;
00344 
00345     while (cnt-- && (r = *d++ - *s++) == 0) ;
00346     return r;
00347 }
00348 
00349 /* Check if chr is contained in the string */
00350 static
00351 int chk_chr (const char* str, int chr) {
00352     while (*str && *str != chr) str++;
00353     return *str;
00354 }
00355 
00356 
00357 
00358 /*-----------------------------------------------------------------------*/
00359 /* Request/Release grant to access the volume                            */
00360 /*-----------------------------------------------------------------------*/
00361 #if _FS_REENTRANT
00362 
00363 static
00364 int lock_fs (
00365     FATFS *fs        /* File system object */
00366 )
00367 {
00368     return ff_req_grant(fs->sobj);
00369 }
00370 
00371 
00372 static
00373 void unlock_fs (
00374     FATFS *fs,        /* File system object */
00375     FRESULT res        /* Result code to be returned */
00376 )
00377 {
00378     if (res != FR_NOT_ENABLED &&
00379         res != FR_INVALID_DRIVE &&
00380         res != FR_INVALID_OBJECT &&
00381         res != FR_TIMEOUT) {
00382         ff_rel_grant(fs->sobj);
00383     }
00384 }
00385 #endif
00386 
00387 
00388 
00389 /*-----------------------------------------------------------------------*/
00390 /* File shareing control functions                                       */
00391 /*-----------------------------------------------------------------------*/
00392 #if _FS_SHARE
00393 
00394 static
00395 FRESULT chk_lock (    /* Check if the file can be accessed */
00396     DIR* dj,        /* Directory object pointing the file to be checked */
00397     int acc            /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
00398 )
00399 {
00400     UINT i, be;
00401 
00402     /* Search file semaphore table */
00403     for (i = be = 0; i < _FS_SHARE; i++) {
00404         if (Files[i].fs) {    /* Existing entry */
00405             if (Files[i].fs == dj->fs &&         /* Check if the file matched with an open file */
00406                 Files[i].clu == dj->sclust &&
00407                 Files[i].idx == dj->index) break;
00408         } else {            /* Blank entry */
00409             be++;
00410         }
00411     }
00412     if (i == _FS_SHARE)    /* The file is not opened */
00413         return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;    /* Is there a blank entry for new file? */
00414 
00415     /* The file has been opened. Reject any open against writing file and all write mode open */
00416     return (acc || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
00417 }
00418 
00419 
00420 static
00421 int enq_lock (    /* Check if an entry is available for a new file */
00422     FATFS* fs    /* File system object */
00423 )
00424 {
00425     UINT i;
00426 
00427     for (i = 0; i < _FS_SHARE && Files[i].fs; i++) ;
00428     return (i == _FS_SHARE) ? 0 : 1;
00429 }
00430 
00431 
00432 static
00433 UINT inc_lock (    /* Increment file open counter and returns its index (0:int error) */
00434     DIR* dj,    /* Directory object pointing the file to register or increment */
00435     int acc        /* Desired access mode (0:Read, !0:Write) */
00436 )
00437 {
00438     UINT i;
00439 
00440 
00441     for (i = 0; i < _FS_SHARE; i++) {    /* Find the file */
00442         if (Files[i].fs == dj->fs &&
00443             Files[i].clu == dj->sclust &&
00444             Files[i].idx == dj->index) break;
00445     }
00446 
00447     if (i == _FS_SHARE) {                /* Not opened. Register it as new. */
00448         for (i = 0; i < _FS_SHARE && Files[i].fs; i++) ;
00449         if (i == _FS_SHARE) return 0;    /* No space to register (int err) */
00450         Files[i].fs = dj->fs;
00451         Files[i].clu = dj->sclust;
00452         Files[i].idx = dj->index;
00453         Files[i].ctr = 0;
00454     }
00455 
00456     if (acc && Files[i].ctr) return 0;    /* Access violation (int err) */
00457 
00458     Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;    /* Set semaphore value */
00459 
00460     return i + 1;
00461 }
00462 
00463 
00464 static
00465 FRESULT dec_lock (    /* Decrement file open counter */
00466     UINT i            /* Semaphore index */
00467 )
00468 {
00469     WORD n;
00470     FRESULT res;
00471 
00472 
00473     if (--i < _FS_SHARE) {
00474         n = Files[i].ctr;
00475         if (n == 0x100) n = 0;
00476         if (n) n--;
00477         Files[i].ctr = n;
00478         if (!n) Files[i].fs = 0;
00479         res = FR_OK;
00480     } else {
00481         res = FR_INT_ERR;
00482     }
00483     return res;
00484 }
00485 
00486 
00487 static
00488 void clear_lock (    /* Clear lock entries of the volume */
00489     FATFS *fs
00490 )
00491 {
00492     UINT i;
00493 
00494     for (i = 0; i < _FS_SHARE; i++) {
00495         if (Files[i].fs == fs) Files[i].fs = 0;
00496     }
00497 }
00498 #endif
00499 
00500 
00501 
00502 /*-----------------------------------------------------------------------*/
00503 /* Change window offset                                                  */
00504 /*-----------------------------------------------------------------------*/
00505 
00506 static
00507 FRESULT move_window (
00508     FATFS *fs,        /* File system object */
00509     DWORD sector    /* Sector number to make appearance in the fs->win[] */
00510 )                    /* Move to zero only writes back dirty window */
00511 {
00512     DWORD wsect;
00513 
00514 
00515     wsect = fs->winsect;
00516     if (wsect != sector) {    /* Changed current window */
00517 #if !_FS_READONLY
00518         if (fs->wflag) {    /* Write back dirty window if needed */
00519             if (disk_write(fs->drv, fs->win, wsect, 1) != RES_OK)
00520                 return FR_DISK_ERR;
00521             fs->wflag = 0;
00522             if (wsect < (fs->fatbase + fs->fsize)) {    /* In FAT area */
00523                 BYTE nf;
00524                 for (nf = fs->n_fats; nf > 1; nf--) {    /* Reflect the change to all FAT copies */
00525                     wsect += fs->fsize;
00526                     disk_write(fs->drv, fs->win, wsect, 1);
00527                 }
00528             }
00529         }
00530 #endif
00531         if (sector) {
00532             if (disk_read(fs->drv, fs->win, sector, 1) != RES_OK)
00533                 return FR_DISK_ERR;
00534             fs->winsect = sector;
00535         }
00536     }
00537 
00538     return FR_OK;
00539 }
00540 
00541 
00542 
00543 
00544 /*-----------------------------------------------------------------------*/
00545 /* Clean-up cached data                                                  */
00546 /*-----------------------------------------------------------------------*/
00547 #if !_FS_READONLY
00548 static
00549 FRESULT sync (    /* FR_OK: successful, FR_DISK_ERR: failed */
00550     FATFS *fs    /* File system object */
00551 )
00552 {
00553     FRESULT res;
00554 
00555 
00556     res = move_window(fs, 0);
00557     if (res == FR_OK) {
00558         /* Update FSInfo sector if needed */
00559         if (fs->fs_type == FS_FAT32 && fs->fsi_flag) {
00560             fs->winsect = 0;
00561             mem_set(fs->win, 0, 512);
00562             ST_WORD(fs->win+BS_55AA, 0xAA55);
00563             ST_DWORD(fs->win+FSI_LeadSig, 0x41615252);
00564             ST_DWORD(fs->win+FSI_StrucSig, 0x61417272);
00565             ST_DWORD(fs->win+FSI_Free_Count, fs->free_clust);
00566             ST_DWORD(fs->win+FSI_Nxt_Free, fs->last_clust);
00567             disk_write(fs->drv, fs->win, fs->fsi_sector, 1);
00568             fs->fsi_flag = 0;
00569         }
00570         /* Make sure that no pending write process in the physical drive */
00571         if (disk_ioctl(fs->drv, CTRL_SYNC, (void*)0) != RES_OK)
00572             res = FR_DISK_ERR;
00573     }
00574 
00575     return res;
00576 }
00577 #endif
00578 
00579 
00580 
00581 
00582 /*-----------------------------------------------------------------------*/
00583 /* Get sector# from cluster#                                             */
00584 /*-----------------------------------------------------------------------*/
00585 
00586 
00587 DWORD clust2sect (    /* !=0: Sector number, 0: Failed - invalid cluster# */
00588     FATFS *fs,        /* File system object */
00589     DWORD clst        /* Cluster# to be converted */
00590 )
00591 {
00592     clst -= 2;
00593     if (clst >= (fs->n_fatent - 2)) return 0;        /* Invalid cluster# */
00594     return clst * fs->csize + fs->database;
00595 }
00596 
00597 
00598 
00599 
00600 /*-----------------------------------------------------------------------*/
00601 /* FAT access - Read value of a FAT entry                                */
00602 /*-----------------------------------------------------------------------*/
00603 
00604 
00605 DWORD get_fat (    /* 0xFFFFFFFF:Disk error, 1:Internal error, Else:Cluster status */
00606     FATFS *fs,    /* File system object */
00607     DWORD clst    /* Cluster# to get the link information */
00608 )
00609 {
00610     UINT wc, bc;
00611     BYTE *p;
00612 
00613 
00614     if (clst < 2 || clst >= fs->n_fatent)    /* Chack range */
00615         return 1;
00616 
00617     switch (fs->fs_type) {
00618     case FS_FAT12 :
00619         bc = (UINT)clst; bc += bc / 2;
00620         if (move_window(fs, fs->fatbase + (bc / SS(fs)))) break;
00621         wc = fs->win[bc % SS(fs)]; bc++;
00622         if (move_window(fs, fs->fatbase + (bc / SS(fs)))) break;
00623         wc |= fs->win[bc % SS(fs)] << 8;
00624         return (clst & 1) ? (wc >> 4) : (wc & 0xFFF);
00625 
00626     case FS_FAT16 :
00627         if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)))) break;
00628         p = &fs->win[clst * 2 % SS(fs)];
00629         return LD_WORD(p);
00630 
00631     case FS_FAT32 :
00632         if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)))) break;
00633         p = &fs->win[clst * 4 % SS(fs)];
00634         return LD_DWORD(p) & 0x0FFFFFFF;
00635     }
00636 
00637     return 0xFFFFFFFF;    /* An error occurred at the disk I/O layer */
00638 }
00639 
00640 
00641 
00642 
00643 /*-----------------------------------------------------------------------*/
00644 /* FAT access - Change value of a FAT entry                              */
00645 /*-----------------------------------------------------------------------*/
00646 #if !_FS_READONLY
00647 
00648 FRESULT put_fat (
00649     FATFS *fs,    /* File system object */
00650     DWORD clst,    /* Cluster# to be changed in range of 2 to fs->n_fatent - 1 */
00651     DWORD val    /* New value to mark the cluster */
00652 )
00653 {
00654     UINT bc;
00655     BYTE *p;
00656     FRESULT res;
00657 
00658 
00659     if (clst < 2 || clst >= fs->n_fatent) {    /* Check range */
00660         res = FR_INT_ERR;
00661 
00662     } else {
00663         switch (fs->fs_type) {
00664         case FS_FAT12 :
00665             bc = clst; bc += bc / 2;
00666             res = move_window(fs, fs->fatbase + (bc / SS(fs)));
00667             if (res != FR_OK) break;
00668             p = &fs->win[bc % SS(fs)];
00669             *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
00670             bc++;
00671             fs->wflag = 1;
00672             res = move_window(fs, fs->fatbase + (bc / SS(fs)));
00673             if (res != FR_OK) break;
00674             p = &fs->win[bc % SS(fs)];
00675             *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
00676             break;
00677 
00678         case FS_FAT16 :
00679             res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
00680             if (res != FR_OK) break;
00681             p = &fs->win[clst * 2 % SS(fs)];
00682             ST_WORD(p, (WORD)val);
00683             break;
00684 
00685         case FS_FAT32 :
00686             res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
00687             if (res != FR_OK) break;
00688             p = &fs->win[clst * 4 % SS(fs)];
00689             val |= LD_DWORD(p) & 0xF0000000;
00690             ST_DWORD(p, val);
00691             break;
00692 
00693         default :
00694             res = FR_INT_ERR;
00695         }
00696         fs->wflag = 1;
00697     }
00698 
00699     return res;
00700 }
00701 #endif /* !_FS_READONLY */
00702 
00703 
00704 
00705 
00706 /*-----------------------------------------------------------------------*/
00707 /* FAT handling - Remove a cluster chain                                 */
00708 /*-----------------------------------------------------------------------*/
00709 #if !_FS_READONLY
00710 static
00711 FRESULT remove_chain (
00712     FATFS *fs,            /* File system object */
00713     DWORD clst            /* Cluster# to remove a chain from */
00714 )
00715 {
00716     FRESULT res;
00717     DWORD nxt;
00718 #if _USE_ERASE
00719     DWORD scl = clst, ecl = clst, resion[2];
00720 #endif
00721 
00722     if (clst < 2 || clst >= fs->n_fatent) {    /* Check range */
00723         res = FR_INT_ERR;
00724 
00725     } else {
00726         res = FR_OK;
00727         while (clst < fs->n_fatent) {            /* Not a last link? */
00728             nxt = get_fat(fs, clst);            /* Get cluster status */
00729             if (nxt == 0) break;                /* Empty cluster? */
00730             if (nxt == 1) { res = FR_INT_ERR; break; }    /* Internal error? */
00731             if (nxt == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }    /* Disk error? */
00732             res = put_fat(fs, clst, 0);            /* Mark the cluster "empty" */
00733             if (res != FR_OK) break;
00734             if (fs->free_clust != 0xFFFFFFFF) {    /* Update FSInfo */
00735                 fs->free_clust++;
00736                 fs->fsi_flag = 1;
00737             }
00738 #if _USE_ERASE
00739             if (ecl + 1 == nxt) {    /* Next cluster is contiguous */
00740                 ecl = nxt;
00741             } else {                /* End of contiguous clusters */ 
00742                 resion[0] = clust2sect(fs, scl);                    /* Start sector */
00743                 resion[1] = clust2sect(fs, ecl) + fs->csize - 1;    /* End sector */
00744                 disk_ioctl(fs->drv, CTRL_ERASE_SECTOR, resion);        /* Erase the block */
00745                 scl = ecl = nxt;
00746             }
00747 #endif
00748             clst = nxt;    /* Next cluster */
00749         }
00750     }
00751 
00752     return res;
00753 }
00754 #endif
00755 
00756 
00757 
00758 
00759 /*-----------------------------------------------------------------------*/
00760 /* FAT handling - Stretch or Create a cluster chain                      */
00761 /*-----------------------------------------------------------------------*/
00762 #if !_FS_READONLY
00763 static
00764 DWORD create_chain (    /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
00765     FATFS *fs,            /* File system object */
00766     DWORD clst            /* Cluster# to stretch. 0 means create a new chain. */
00767 )
00768 {
00769     DWORD cs, ncl, scl;
00770     FRESULT res;
00771 
00772 
00773     if (clst == 0) {        /* Create a new chain */
00774         scl = fs->last_clust;            /* Get suggested start point */
00775         if (!scl || scl >= fs->n_fatent) scl = 1;
00776     }
00777     else {                    /* Stretch the current chain */
00778         cs = get_fat(fs, clst);            /* Check the cluster status */
00779         if (cs < 2) return 1;            /* It is an invalid cluster */
00780         if (cs < fs->n_fatent) return cs;    /* It is already followed by next cluster */
00781         scl = clst;
00782     }
00783 
00784     ncl = scl;                /* Start cluster */
00785     for (;;) {
00786         ncl++;                            /* Next cluster */
00787         if (ncl >= fs->n_fatent) {        /* Wrap around */
00788             ncl = 2;
00789             if (ncl > scl) return 0;    /* No free cluster */
00790         }
00791         cs = get_fat(fs, ncl);            /* Get the cluster status */
00792         if (cs == 0) break;                /* Found a free cluster */
00793         if (cs == 0xFFFFFFFF || cs == 1)/* An error occurred */
00794             return cs;
00795         if (ncl == scl) return 0;        /* No free cluster */
00796     }
00797 
00798     res = put_fat(fs, ncl, 0x0FFFFFFF);    /* Mark the new cluster "last link" */
00799     if (res == FR_OK && clst != 0) {
00800         res = put_fat(fs, clst, ncl);    /* Link it to the previous one if needed */
00801     }
00802     if (res == FR_OK) {
00803         fs->last_clust = ncl;            /* Update FSINFO */
00804         if (fs->free_clust != 0xFFFFFFFF) {
00805             fs->free_clust--;
00806             fs->fsi_flag = 1;
00807         }
00808     } else {
00809         ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;
00810     }
00811 
00812     return ncl;        /* Return new cluster number or error code */
00813 }
00814 #endif /* !_FS_READONLY */
00815 
00816 
00817 
00818 
00819 /*-----------------------------------------------------------------------*/
00820 /* Directory handling - Set directory index                              */
00821 /*-----------------------------------------------------------------------*/
00822 
00823 static
00824 FRESULT dir_sdi (
00825     DIR *dj,        /* Pointer to directory object */
00826     WORD idx        /* Directory index number */
00827 )
00828 {
00829     DWORD clst;
00830     WORD ic;
00831 
00832 
00833     dj->index = idx;
00834     clst = dj->sclust;
00835     if (clst == 1 || clst >= dj->fs->n_fatent)    /* Check start cluster range */
00836         return FR_INT_ERR;
00837     if (!clst && dj->fs->fs_type == FS_FAT32)    /* Replace cluster# 0 with root cluster# if in FAT32 */
00838         clst = dj->fs->dirbase;
00839 
00840     if (clst == 0) {    /* Static table (root-dir in FAT12/16) */
00841         dj->clust = clst;
00842         if (idx >= dj->fs->n_rootdir)        /* Index is out of range */
00843             return FR_INT_ERR;
00844         dj->sect = dj->fs->dirbase + idx / (SS(dj->fs) / 32);    /* Sector# */
00845     }
00846     else {                /* Dynamic table (sub-dirs or root-dir in FAT32) */
00847         ic = SS(dj->fs) / 32 * dj->fs->csize;    /* Entries per cluster */
00848         while (idx >= ic) {    /* Follow cluster chain */
00849             clst = get_fat(dj->fs, clst);                /* Get next cluster */
00850             if (clst == 0xFFFFFFFF) return FR_DISK_ERR;    /* Disk error */
00851             if (clst < 2 || clst >= dj->fs->n_fatent)    /* Reached to end of table or int error */
00852                 return FR_INT_ERR;
00853             idx -= ic;
00854         }
00855         dj->clust = clst;
00856         dj->sect = clust2sect(dj->fs, clst) + idx / (SS(dj->fs) / 32);    /* Sector# */
00857     }
00858 
00859     dj->dir = dj->fs->win + (idx % (SS(dj->fs) / 32)) * 32;    /* Ptr to the entry in the sector */
00860 
00861     return FR_OK;    /* Seek succeeded */
00862 }
00863 
00864 
00865 
00866 
00867 /*-----------------------------------------------------------------------*/
00868 /* Directory handling - Move directory index next                        */
00869 /*-----------------------------------------------------------------------*/
00870 
00871 static
00872 FRESULT dir_next (    /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not stretch */
00873     DIR *dj,        /* Pointer to directory object */
00874     int stretch        /* 0: Do not stretch table, 1: Stretch table if needed */
00875 )
00876 {
00877     DWORD clst;
00878     WORD i;
00879 
00880 
00881     i = dj->index + 1;
00882     if (!i || !dj->sect)    /* Report EOT when index has reached 65535 */
00883         return FR_NO_FILE;
00884 
00885     if (!(i % (SS(dj->fs) / 32))) {    /* Sector changed? */
00886         dj->sect++;                    /* Next sector */
00887 
00888         if (dj->clust == 0) {    /* Static table */
00889             if (i >= dj->fs->n_rootdir)    /* Report EOT when end of table */
00890                 return FR_NO_FILE;
00891         }
00892         else {                    /* Dynamic table */
00893             if (((i / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0) {    /* Cluster changed? */
00894                 clst = get_fat(dj->fs, dj->clust);                /* Get next cluster */
00895                 if (clst <= 1) return FR_INT_ERR;
00896                 if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
00897                 if (clst >= dj->fs->n_fatent) {                    /* When it reached end of dynamic table */
00898 #if !_FS_READONLY
00899                     BYTE c;
00900                     if (!stretch) return FR_NO_FILE;            /* When do not stretch, report EOT */
00901                     clst = create_chain(dj->fs, dj->clust);        /* Stretch cluster chain */
00902                     if (clst == 0) return FR_DENIED;            /* No free cluster */
00903                     if (clst == 1) return FR_INT_ERR;
00904                     if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
00905                     /* Clean-up stretched table */
00906                     if (move_window(dj->fs, 0)) return FR_DISK_ERR;    /* Flush active window */
00907                     mem_set(dj->fs->win, 0, SS(dj->fs));            /* Clear window buffer */
00908                     dj->fs->winsect = clust2sect(dj->fs, clst);    /* Cluster start sector */
00909                     for (c = 0; c < dj->fs->csize; c++) {        /* Fill the new cluster with 0 */
00910                         dj->fs->wflag = 1;
00911                         if (move_window(dj->fs, 0)) return FR_DISK_ERR;
00912                         dj->fs->winsect++;
00913                     }
00914                     dj->fs->winsect -= c;                        /* Rewind window address */
00915 #else
00916                     return FR_NO_FILE;            /* Report EOT */
00917 #endif
00918                 }
00919                 dj->clust = clst;                /* Initialize data for new cluster */
00920                 dj->sect = clust2sect(dj->fs, clst);
00921             }
00922         }
00923     }
00924 
00925     dj->index = i;
00926     dj->dir = dj->fs->win + (i % (SS(dj->fs) / 32)) * 32;
00927 
00928     return FR_OK;
00929 }
00930 
00931 
00932 
00933 
00934 /*-----------------------------------------------------------------------*/
00935 /* LFN handling - Test/Pick/Fit an LFN segment from/to directory entry   */
00936 /*-----------------------------------------------------------------------*/
00937 #if _USE_LFN
00938 static
00939 const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};    /* Offset of LFN chars in the directory entry */
00940 
00941 
00942 static
00943 int cmp_lfn (            /* 1:Matched, 0:Not matched */
00944     WCHAR *lfnbuf,        /* Pointer to the LFN to be compared */
00945     BYTE *dir            /* Pointer to the directory entry containing a part of LFN */
00946 )
00947 {
00948     UINT i, s;
00949     WCHAR wc, uc;
00950 
00951 
00952     i = ((dir[LDIR_Ord] & 0xBF) - 1) * 13;    /* Get offset in the LFN buffer */
00953     s = 0; wc = 1;
00954     do {
00955         uc = LD_WORD(dir+LfnOfs[s]);    /* Pick an LFN character from the entry */
00956         if (wc) {    /* Last char has not been processed */
00957             wc = ff_wtoupper(uc);        /* Convert it to upper case */
00958             if (i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++]))    /* Compare it */
00959                 return 0;                /* Not matched */
00960         } else {
00961             if (uc != 0xFFFF) return 0;    /* Check filler */
00962         }
00963     } while (++s < 13);                /* Repeat until all chars in the entry are checked */
00964 
00965     if ((dir[LDIR_Ord] & 0x40) && wc && lfnbuf[i])    /* Last segment matched but different length */
00966         return 0;
00967 
00968     return 1;                        /* The part of LFN matched */
00969 }
00970 
00971 
00972 
00973 static
00974 int pick_lfn (            /* 1:Succeeded, 0:Buffer overflow */
00975     WCHAR *lfnbuf,        /* Pointer to the Unicode-LFN buffer */
00976     BYTE *dir            /* Pointer to the directory entry */
00977 )
00978 {
00979     UINT i, s;
00980     WCHAR wc, uc;
00981 
00982 
00983     i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;    /* Offset in the LFN buffer */
00984 
00985     s = 0; wc = 1;
00986     do {
00987         uc = LD_WORD(dir+LfnOfs[s]);        /* Pick an LFN character from the entry */
00988         if (wc) {    /* Last char has not been processed */
00989             if (i >= _MAX_LFN) return 0;    /* Buffer overflow? */
00990             lfnbuf[i++] = wc = uc;            /* Store it */
00991         } else {
00992             if (uc != 0xFFFF) return 0;        /* Check filler */
00993         }
00994     } while (++s < 13);                        /* Read all character in the entry */
00995 
00996     if (dir[LDIR_Ord] & 0x40) {                /* Put terminator if it is the last LFN part */
00997         if (i >= _MAX_LFN) return 0;        /* Buffer overflow? */
00998         lfnbuf[i] = 0;
00999     }
01000 
01001     return 1;
01002 }
01003 
01004 
01005 #if !_FS_READONLY
01006 static
01007 void fit_lfn (
01008     const WCHAR *lfnbuf,    /* Pointer to the LFN buffer */
01009     BYTE *dir,                /* Pointer to the directory entry */
01010     BYTE ord,                /* LFN order (1-20) */
01011     BYTE sum                /* SFN sum */
01012 )
01013 {
01014     UINT i, s;
01015     WCHAR wc;
01016 
01017 
01018     dir[LDIR_Chksum] = sum;            /* Set check sum */
01019     dir[LDIR_Attr] = AM_LFN;        /* Set attribute. LFN entry */
01020     dir[LDIR_Type] = 0;
01021     ST_WORD(dir+LDIR_FstClusLO, 0);
01022 
01023     i = (ord - 1) * 13;                /* Get offset in the LFN buffer */
01024     s = wc = 0;
01025     do {
01026         if (wc != 0xFFFF) wc = lfnbuf[i++];    /* Get an effective char */
01027         ST_WORD(dir+LfnOfs[s], wc);    /* Put it */
01028         if (!wc) wc = 0xFFFF;        /* Padding chars following last char */
01029     } while (++s < 13);
01030     if (wc == 0xFFFF || !lfnbuf[i]) ord |= 0x40;    /* Bottom LFN part is the start of LFN sequence */
01031     dir[LDIR_Ord] = ord;            /* Set the LFN order */
01032 }
01033 
01034 #endif
01035 #endif
01036 
01037 
01038 
01039 /*-----------------------------------------------------------------------*/
01040 /* Create numbered name                                                  */
01041 /*-----------------------------------------------------------------------*/
01042 #if _USE_LFN
01043 void gen_numname (
01044     BYTE *dst,            /* Pointer to generated SFN */
01045     const BYTE *src,    /* Pointer to source SFN to be modified */
01046     const WCHAR *lfn,    /* Pointer to LFN */
01047     WORD seq            /* Sequence number */
01048 )
01049 {
01050     BYTE ns[8], c;
01051     UINT i, j;
01052 
01053 
01054     mem_cpy(dst, src, 11);
01055 
01056     if (seq > 5) {    /* On many collisions, generate a hash number instead of sequential number */
01057         do seq = (seq >> 1) + (seq << 15) + (WORD)*lfn++; while (*lfn);
01058     }
01059 
01060     /* itoa */
01061     i = 7;
01062     do {
01063         c = (seq % 16) + '0';
01064         if (c > '9') c += 7;
01065         ns[i--] = c;
01066         seq /= 16;
01067     } while (seq);
01068     ns[i] = '~';
01069 
01070     /* Append the number */
01071     for (j = 0; j < i && dst[j] != ' '; j++) {
01072         if (IsDBCS1(dst[j])) {
01073             if (j == i - 1) break;
01074             j++;
01075         }
01076     }
01077     do {
01078         dst[j++] = (i < 8) ? ns[i++] : ' ';
01079     } while (j < 8);
01080 }
01081 #endif
01082 
01083 
01084 
01085 
01086 /*-----------------------------------------------------------------------*/
01087 /* Calculate sum of an SFN                                               */
01088 /*-----------------------------------------------------------------------*/
01089 #if _USE_LFN
01090 static
01091 BYTE sum_sfn (
01092     const BYTE *dir        /* Ptr to directory entry */
01093 )
01094 {
01095     BYTE sum = 0;
01096     UINT n = 11;
01097 
01098     do sum = (sum >> 1) + (sum << 7) + *dir++; while (--n);
01099     return sum;
01100 }
01101 #endif
01102 
01103 
01104 
01105 
01106 /*-----------------------------------------------------------------------*/
01107 /* Directory handling - Find an object in the directory                  */
01108 /*-----------------------------------------------------------------------*/
01109 
01110 static
01111 FRESULT dir_find (
01112     DIR *dj            /* Pointer to the directory object linked to the file name */
01113 )
01114 {
01115     FRESULT res;
01116     BYTE c, *dir;
01117 #if _USE_LFN
01118     BYTE a, ord, sum;
01119 #endif
01120 
01121     res = dir_sdi(dj, 0);            /* Rewind directory object */
01122     if (res != FR_OK) return res;
01123 
01124 #if _USE_LFN
01125     ord = sum = 0xFF;
01126 #endif
01127     do {
01128         res = move_window(dj->fs, dj->sect);
01129         if (res != FR_OK) break;
01130         dir = dj->dir;                    /* Ptr to the directory entry of current index */
01131         c = dir[DIR_Name];
01132         if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of table */
01133 #if _USE_LFN    /* LFN configuration */
01134         a = dir[DIR_Attr] & AM_MASK;
01135         if (c == 0xE5 || ((a & AM_VOL) && a != AM_LFN)) {    /* An entry without valid data */
01136             ord = 0xFF;
01137         } else {
01138             if (a == AM_LFN) {            /* An LFN entry is found */
01139                 if (dj->lfn) {
01140                     if (c & 0x40) {        /* Is it start of LFN sequence? */
01141                         sum = dir[LDIR_Chksum];
01142                         c &= 0xBF; ord = c;    /* LFN start order */
01143                         dj->lfn_idx = dj->index;
01144                     }
01145                     /* Check validity of the LFN entry and compare it with given name */
01146                     ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
01147                 }
01148             } else {                    /* An SFN entry is found */
01149                 if (!ord && sum == sum_sfn(dir)) break;    /* LFN matched? */
01150                 ord = 0xFF; dj->lfn_idx = 0xFFFF;    /* Reset LFN sequence */
01151                 if (!(dj->fn[NS] & NS_LOSS) && !mem_cmp(dir, dj->fn, 11)) break;    /* SFN matched? */
01152             }
01153         }
01154 #else        /* Non LFN configuration */
01155         if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */
01156             break;
01157 #endif
01158         res = dir_next(dj, 0);        /* Next entry */
01159     } while (res == FR_OK);
01160 
01161     return res;
01162 }
01163 
01164 
01165 
01166 
01167 /*-----------------------------------------------------------------------*/
01168 /* Read an object from the directory                                     */
01169 /*-----------------------------------------------------------------------*/
01170 #if _FS_MINIMIZE <= 1
01171 static
01172 FRESULT dir_read (
01173     DIR *dj            /* Pointer to the directory object that pointing the entry to be read */
01174 )
01175 {
01176     FRESULT res;
01177     BYTE c, *dir;
01178 #if _USE_LFN
01179     BYTE a, ord = 0xFF, sum = 0xFF;
01180 #endif
01181 
01182     res = FR_NO_FILE;
01183     while (dj->sect) {
01184         res = move_window(dj->fs, dj->sect);
01185         if (res != FR_OK) break;
01186         dir = dj->dir;                    /* Ptr to the directory entry of current index */
01187         c = dir[DIR_Name];
01188         if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of table */
01189 #if _USE_LFN    /* LFN configuration */
01190         a = dir[DIR_Attr] & AM_MASK;
01191         if (c == 0xE5 || (!_FS_RPATH && c == '.') || ((a & AM_VOL) && a != AM_LFN)) {    /* An entry without valid data */
01192             ord = 0xFF;
01193         } else {
01194             if (a == AM_LFN) {            /* An LFN entry is found */
01195                 if (c & 0x40) {            /* Is it start of LFN sequence? */
01196                     sum = dir[LDIR_Chksum];
01197                     c &= 0xBF; ord = c;
01198                     dj->lfn_idx = dj->index;
01199                 }
01200                 /* Check LFN validity and capture it */
01201                 ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
01202             } else {                    /* An SFN entry is found */
01203                 if (ord || sum != sum_sfn(dir))    /* Is there a valid LFN? */
01204                     dj->lfn_idx = 0xFFFF;        /* It has no LFN. */
01205                 break;
01206             }
01207         }
01208 #else        /* Non LFN configuration */
01209         if (c != 0xE5 && (_FS_RPATH || c != '.') && !(dir[DIR_Attr] & AM_VOL))    /* Is it a valid entry? */
01210             break;
01211 #endif
01212         res = dir_next(dj, 0);                /* Next entry */
01213         if (res != FR_OK) break;
01214     }
01215 
01216     if (res != FR_OK) dj->sect = 0;
01217 
01218     return res;
01219 }
01220 #endif
01221 
01222 
01223 
01224 /*-----------------------------------------------------------------------*/
01225 /* Register an object to the directory                                   */
01226 /*-----------------------------------------------------------------------*/
01227 #if !_FS_READONLY
01228 static
01229 FRESULT dir_register (    /* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */
01230     DIR *dj                /* Target directory with object name to be created */
01231 )
01232 {
01233     FRESULT res;
01234     BYTE c, *dir;
01235 #if _USE_LFN    /* LFN configuration */
01236     WORD n, ne, is;
01237     BYTE sn[12], *fn, sum;
01238     WCHAR *lfn;
01239 
01240 
01241     fn = dj->fn; lfn = dj->lfn;
01242     mem_cpy(sn, fn, 12);
01243 
01244     if (_FS_RPATH && (sn[NS] & NS_DOT))        /* Cannot create dot entry */
01245         return FR_INVALID_NAME;
01246 
01247     if (sn[NS] & NS_LOSS) {            /* When LFN is out of 8.3 format, generate a numbered name */
01248         fn[NS] = 0; dj->lfn = 0;            /* Find only SFN */
01249         for (n = 1; n < 100; n++) {
01250             gen_numname(fn, sn, lfn, n);    /* Generate a numbered name */
01251             res = dir_find(dj);                /* Check if the name collides with existing SFN */
01252             if (res != FR_OK) break;
01253         }
01254         if (n == 100) return FR_DENIED;        /* Abort if too many collisions */
01255         if (res != FR_NO_FILE) return res;    /* Abort if the result is other than 'not collided' */
01256         fn[NS] = sn[NS]; dj->lfn = lfn;
01257     }
01258 
01259     if (sn[NS] & NS_LFN) {            /* When LFN is to be created, reserve an SFN + LFN entries. */
01260         for (ne = 0; lfn[ne]; ne++) ;
01261         ne = (ne + 25) / 13;
01262     } else {                        /* Otherwise reserve only an SFN entry. */
01263         ne = 1;
01264     }
01265 
01266     /* Reserve contiguous entries */
01267     res = dir_sdi(dj, 0);
01268     if (res != FR_OK) return res;
01269     n = is = 0;
01270     do {
01271         res = move_window(dj->fs, dj->sect);
01272         if (res != FR_OK) break;
01273         c = *dj->dir;                /* Check the entry status */
01274         if (c == 0xE5 || c == 0) {    /* Is it a blank entry? */
01275             if (n == 0) is = dj->index;    /* First index of the contiguous entry */
01276             if (++n == ne) break;    /* A contiguous entry that required count is found */
01277         } else {
01278             n = 0;                    /* Not a blank entry. Restart to search */
01279         }
01280         res = dir_next(dj, 1);        /* Next entry with table stretch */
01281     } while (res == FR_OK);
01282 
01283     if (res == FR_OK && ne > 1) {    /* Initialize LFN entry if needed */
01284         res = dir_sdi(dj, is);
01285         if (res == FR_OK) {
01286             sum = sum_sfn(dj->fn);    /* Sum of the SFN tied to the LFN */
01287             ne--;
01288             do {                    /* Store LFN entries in bottom first */
01289                 res = move_window(dj->fs, dj->sect);
01290                 if (res != FR_OK) break;
01291                 fit_lfn(dj->lfn, dj->dir, (BYTE)ne, sum);
01292                 dj->fs->wflag = 1;
01293                 res = dir_next(dj, 0);    /* Next entry */
01294             } while (res == FR_OK && --ne);
01295         }
01296     }
01297 
01298 #else    /* Non LFN configuration */
01299     res = dir_sdi(dj, 0);
01300     if (res == FR_OK) {
01301         do {    /* Find a blank entry for the SFN */
01302             res = move_window(dj->fs, dj->sect);
01303             if (res != FR_OK) break;
01304             c = *dj->dir;
01305             if (c == 0xE5 || c == 0) break;    /* Is it a blank entry? */
01306             res = dir_next(dj, 1);            /* Next entry with table stretch */
01307         } while (res == FR_OK);
01308     }
01309 #endif
01310 
01311     if (res == FR_OK) {        /* Initialize the SFN entry */
01312         res = move_window(dj->fs, dj->sect);
01313         if (res == FR_OK) {
01314             dir = dj->dir;
01315             mem_set(dir, 0, 32);        /* Clean the entry */
01316             mem_cpy(dir, dj->fn, 11);    /* Put SFN */
01317 #if _USE_LFN
01318             dir[DIR_NTres] = *(dj->fn+NS) & (NS_BODY | NS_EXT);    /* Put NT flag */
01319 #endif
01320             dj->fs->wflag = 1;
01321         }
01322     }
01323 
01324     return res;
01325 }
01326 #endif /* !_FS_READONLY */
01327 
01328 
01329 
01330 
01331 /*-----------------------------------------------------------------------*/
01332 /* Remove an object from the directory                                   */
01333 /*-----------------------------------------------------------------------*/
01334 #if !_FS_READONLY && !_FS_MINIMIZE
01335 static
01336 FRESULT dir_remove (    /* FR_OK: Successful, FR_DISK_ERR: A disk error */
01337     DIR *dj                /* Directory object pointing the entry to be removed */
01338 )
01339 {
01340     FRESULT res;
01341 #if _USE_LFN    /* LFN configuration */
01342     WORD i;
01343 
01344     i = dj->index;    /* SFN index */
01345     res = dir_sdi(dj, (WORD)((dj->lfn_idx == 0xFFFF) ? i : dj->lfn_idx));    /* Goto the SFN or top of the LFN entries */
01346     if (res == FR_OK) {
01347         do {
01348             res = move_window(dj->fs, dj->sect);
01349             if (res != FR_OK) break;
01350             *dj->dir = 0xE5;            /* Mark the entry "deleted" */
01351             dj->fs->wflag = 1;
01352             if (dj->index >= i) break;    /* When reached SFN, all entries of the object has been deleted. */
01353             res = dir_next(dj, 0);        /* Next entry */
01354         } while (res == FR_OK);
01355         if (res == FR_NO_FILE) res = FR_INT_ERR;
01356     }
01357 
01358 #else            /* Non LFN configuration */
01359     res = dir_sdi(dj, dj->index);
01360     if (res == FR_OK) {
01361         res = move_window(dj->fs, dj->sect);
01362         if (res == FR_OK) {
01363             *dj->dir = 0xE5;            /* Mark the entry "deleted" */
01364             dj->fs->wflag = 1;
01365         }
01366     }
01367 #endif
01368 
01369     return res;
01370 }
01371 #endif /* !_FS_READONLY */
01372 
01373 
01374 
01375 
01376 /*-----------------------------------------------------------------------*/
01377 /* Pick a segment and create the object name in directory form           */
01378 /*-----------------------------------------------------------------------*/
01379 
01380 static
01381 FRESULT create_name (
01382     DIR *dj,            /* Pointer to the directory object */
01383     const TCHAR **path    /* Pointer to pointer to the segment in the path string */
01384 )
01385 {
01386 #ifdef _EXCVT
01387     static const BYTE excvt[] = _EXCVT;    /* Upper conversion table for extended chars */
01388 #endif
01389 
01390 #if _USE_LFN    /* LFN configuration */
01391     BYTE b, cf;
01392     WCHAR w, *lfn;
01393     UINT i, ni, si, di;
01394     const TCHAR *p;
01395 
01396     /* Create LFN in Unicode */
01397     si = di = 0;
01398     p = *path;
01399     lfn = dj->lfn;
01400     for (;;) {
01401         w = p[si++];                    /* Get a character */
01402         if (w < ' ' || w == '/' || w == '\\') break;    /* Break on end of segment */
01403         if (di >= _MAX_LFN)                /* Reject too long name */
01404             return FR_INVALID_NAME;
01405 #if !_LFN_UNICODE
01406         w &= 0xFF;
01407         if (IsDBCS1(w)) {                /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
01408             b = (BYTE)p[si++];            /* Get 2nd byte */
01409             if (!IsDBCS2(b))
01410                 return FR_INVALID_NAME;    /* Reject invalid sequence */
01411             w = (w << 8) + b;            /* Create a DBC */
01412         }
01413         w = ff_convert(w, 1);            /* Convert ANSI/OEM to Unicode */
01414         if (!w) return FR_INVALID_NAME;    /* Reject invalid code */
01415 #endif
01416         if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) /* Reject illegal chars for LFN */
01417             return FR_INVALID_NAME;
01418         lfn[di++] = w;                    /* Store the Unicode char */
01419     }
01420     *path = &p[si];                        /* Return pointer to the next segment */
01421     cf = (w < ' ') ? NS_LAST : 0;        /* Set last segment flag if end of path */
01422 #if _FS_RPATH
01423     if ((di == 1 && lfn[di-1] == '.') || /* Is this a dot entry? */
01424         (di == 2 && lfn[di-1] == '.' && lfn[di-2] == '.')) {
01425         lfn[di] = 0;
01426         for (i = 0; i < 11; i++)
01427             dj->fn[i] = (i < di) ? '.' : ' ';
01428         dj->fn[i] = cf | NS_DOT;        /* This is a dot entry */
01429         return FR_OK;
01430     }
01431 #endif
01432     while (di) {                        /* Strip trailing spaces and dots */
01433         w = lfn[di-1];
01434         if (w != ' ' && w != '.') break;
01435         di--;
01436     }
01437     if (!di) return FR_INVALID_NAME;    /* Reject nul string */
01438 
01439     lfn[di] = 0;                        /* LFN is created */
01440 
01441     /* Create SFN in directory form */
01442     mem_set(dj->fn, ' ', 11);
01443     for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++) ;    /* Strip leading spaces and dots */
01444     if (si) cf |= NS_LOSS | NS_LFN;
01445     while (di && lfn[di - 1] != '.') di--;    /* Find extension (di<=si: no extension) */
01446 
01447     b = i = 0; ni = 8;
01448     for (;;) {
01449         w = lfn[si++];                    /* Get an LFN char */
01450         if (!w) break;                    /* Break on end of the LFN */
01451         if (w == ' ' || (w == '.' && si != di)) {    /* Remove spaces and dots */
01452             cf |= NS_LOSS | NS_LFN; continue;
01453         }
01454 
01455         if (i >= ni || si == di) {        /* Extension or end of SFN */
01456             if (ni == 11) {                /* Long extension */
01457                 cf |= NS_LOSS | NS_LFN; break;
01458             }
01459             if (si != di) cf |= NS_LOSS | NS_LFN;    /* Out of 8.3 format */
01460             if (si > di) break;            /* No extension */
01461             si = di; i = 8; ni = 11;    /* Enter extension section */
01462             b <<= 2; continue;
01463         }
01464 
01465         if (w >= 0x80) {                /* Non ASCII char */
01466 #ifdef _EXCVT
01467             w = ff_convert(w, 0);        /* Unicode -> OEM code */
01468             if (w) w = excvt[w - 0x80];    /* Convert extended char to upper (SBCS) */
01469 #else
01470             w = ff_convert(ff_wtoupper(w), 0);    /* Upper converted Unicode -> OEM code */
01471 #endif
01472             cf |= NS_LFN;                /* Force create LFN entry */
01473         }
01474 
01475         if (_DF1S && w >= 0x100) {        /* Double byte char (always false on SBCS cfg) */
01476             if (i >= ni - 1) {
01477                 cf |= NS_LOSS | NS_LFN; i = ni; continue;
01478             }
01479             dj->fn[i++] = (BYTE)(w >> 8);
01480         } else {                        /* Single byte char */
01481             if (!w || chk_chr("+,;=[]", w)) {    /* Replace illegal chars for SFN */
01482                 w = '_'; cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
01483             } else {
01484                 if (IsUpper(w)) {        /* ASCII large capital */
01485                     b |= 2;
01486                 } else {
01487                     if (IsLower(w)) {    /* ASCII small capital */
01488                         b |= 1; w -= 0x20;
01489                     }
01490                 }
01491             }
01492         }
01493         dj->fn[i++] = (BYTE)w;
01494     }
01495 
01496     if (dj->fn[0] == 0xE5) dj->fn[0] = 0x05;    /* If the first char collides with deleted mark, replace it with 0x05 */
01497 
01498     if (ni == 8) b <<= 2;
01499     if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03)    /* Create LFN entry when there are composite capitals */
01500         cf |= NS_LFN;
01501     if (!(cf & NS_LFN)) {                        /* When LFN is in 8.3 format without extended char, NT flags are created */
01502         if ((b & 0x03) == 0x01) cf |= NS_EXT;    /* NT flag (Extension has only small capital) */
01503         if ((b & 0x0C) == 0x04) cf |= NS_BODY;    /* NT flag (Filename has only small capital) */
01504     }
01505 
01506     dj->fn[NS] = cf;    /* SFN is created */
01507 
01508     return FR_OK;
01509 
01510 
01511 #else    /* Non-LFN configuration */
01512     BYTE b, c, d, *sfn;
01513     UINT ni, si, i;
01514     const char *p;
01515 
01516     /* Create file name in directory form */
01517     sfn = dj->fn;
01518     mem_set(sfn, ' ', 11);
01519     si = i = b = 0; ni = 8;
01520     p = *path;
01521 #if _FS_RPATH
01522     if (p[si] == '.') { /* Is this a dot entry? */
01523         for (;;) {
01524             c = (BYTE)p[si++];
01525             if (c != '.' || si >= 3) break;
01526             sfn[i++] = c;
01527         }
01528         if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
01529         *path = &p[si];                                    /* Return pointer to the next segment */
01530         sfn[NS] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;    /* Set last segment flag if end of path */
01531         return FR_OK;
01532     }
01533 #endif
01534     for (;;) {
01535         c = (BYTE)p[si++];
01536         if (c <= ' ' || c == '/' || c == '\\') break;    /* Break on end of segment */
01537         if (c == '.' || i >= ni) {
01538             if (ni != 8 || c != '.') return FR_INVALID_NAME;
01539             i = 8; ni = 11;
01540             b <<= 2; continue;
01541         }
01542         if (c >= 0x80) {                /* Extended char? */
01543             b |= 3;                        /* Eliminate NT flag */
01544 #ifdef _EXCVT
01545             c = excvt[c-0x80];            /* Upper conversion (SBCS) */
01546 #else
01547 #if !_DF1S    /* ASCII only cfg */
01548             return FR_INVALID_NAME;
01549 #endif
01550 #endif
01551         }
01552         if (IsDBCS1(c)) {                /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
01553             d = (BYTE)p[si++];            /* Get 2nd byte */
01554             if (!IsDBCS2(d) || i >= ni - 1)    /* Reject invalid DBC */
01555                 return FR_INVALID_NAME;
01556             sfn[i++] = c;
01557             sfn[i++] = d;
01558         } else {                        /* Single byte code */
01559             if (chk_chr("\"*+,:;<=>\?[]|\x7F", c))    /* Reject illegal chrs for SFN */
01560                 return FR_INVALID_NAME;
01561             if (IsUpper(c)) {            /* ASCII large capital? */
01562                 b |= 2;
01563             } else {
01564                 if (IsLower(c)) {        /* ASCII small capital? */
01565                     b |= 1; c -= 0x20;
01566                 }
01567             }
01568             sfn[i++] = c;
01569         }
01570     }
01571     *path = &p[si];                        /* Return pointer to the next segment */
01572     c = (c <= ' ') ? NS_LAST : 0;        /* Set last segment flag if end of path */
01573 
01574     if (!i) return FR_INVALID_NAME;        /* Reject nul string */
01575     if (sfn[0] == 0xE5) sfn[0] = 0x05;    /* When first char collides with 0xE5, replace it with 0x05 */
01576 
01577     if (ni == 8) b <<= 2;
01578     if ((b & 0x03) == 0x01) c |= NS_EXT;    /* NT flag (Name extension has only small capital) */
01579     if ((b & 0x0C) == 0x04) c |= NS_BODY;    /* NT flag (Name body has only small capital) */
01580 
01581     sfn[NS] = c;        /* Store NT flag, File name is created */
01582 
01583     return FR_OK;
01584 #endif
01585 }
01586 
01587 
01588 
01589 
01590 /*-----------------------------------------------------------------------*/
01591 /* Get file information from directory entry                             */
01592 /*-----------------------------------------------------------------------*/
01593 #if _FS_MINIMIZE <= 1
01594 static
01595 void get_fileinfo (        /* No return code */
01596     DIR *dj,            /* Pointer to the directory object */
01597     FILINFO *fno         /* Pointer to the file information to be filled */
01598 )
01599 {
01600     UINT i;
01601     BYTE nt, *dir;
01602     TCHAR *p, c;
01603 
01604 
01605     p = fno->fname;
01606     if (dj->sect) {
01607         dir = dj->dir;
01608         nt = dir[DIR_NTres];        /* NT flag */
01609         for (i = 0; i < 8; i++) {    /* Copy name body */
01610             c = dir[i];
01611             if (c == ' ') break;
01612             if (c == 0x05) c = (TCHAR)0xE5;
01613             if (_USE_LFN && (nt & NS_BODY) && IsUpper(c)) c += 0x20;
01614 #if _LFN_UNICODE
01615             if (IsDBCS1(c) && i < 7 && IsDBCS2(dir[i+1]))
01616                 c = (c << 8) | dir[++i];
01617             c = ff_convert(c, 1);
01618             if (!c) c = '?';
01619 #endif
01620             *p++ = c;
01621         }
01622         if (dir[8] != ' ') {        /* Copy name extension */
01623             *p++ = '.';
01624             for (i = 8; i < 11; i++) {
01625                 c = dir[i];
01626                 if (c == ' ') break;
01627                 if (_USE_LFN && (nt & NS_EXT) && IsUpper(c)) c += 0x20;
01628 #if _LFN_UNICODE
01629                 if (IsDBCS1(c) && i < 10 && IsDBCS2(dir[i+1]))
01630                     c = (c << 8) | dir[++i];
01631                 c = ff_convert(c, 1);
01632                 if (!c) c = '?';
01633 #endif
01634                 *p++ = c;
01635             }
01636         }
01637         fno->fattrib = dir[DIR_Attr];                /* Attribute */
01638         fno->fsize = LD_DWORD(dir+DIR_FileSize);    /* Size */
01639         fno->fdate = LD_WORD(dir+DIR_WrtDate);        /* Date */
01640         fno->ftime = LD_WORD(dir+DIR_WrtTime);        /* Time */
01641     }
01642     *p = 0;        /* Terminate SFN str by a \0 */
01643 
01644 #if _USE_LFN
01645     if (fno->lfname && fno->lfsize) {
01646         TCHAR *tp = fno->lfname;
01647         WCHAR w, *lfn;
01648 
01649         i = 0;
01650         if (dj->sect && dj->lfn_idx != 0xFFFF) {/* Get LFN if available */
01651             lfn = dj->lfn;
01652             while ((w = *lfn++) != 0) {            /* Get an LFN char */
01653 #if !_LFN_UNICODE
01654                 w = ff_convert(w, 0);            /* Unicode -> OEM conversion */
01655                 if (!w) { i = 0; break; }        /* Could not convert, no LFN */
01656                 if (_DF1S && w >= 0x100)        /* Put 1st byte if it is a DBC (always false on SBCS cfg) */
01657                     tp[i++] = (TCHAR)(w >> 8);
01658 #endif
01659                 if (i >= fno->lfsize - 1) { i = 0; break; }    /* Buffer overflow, no LFN */
01660                 tp[i++] = (TCHAR)w;
01661             }
01662         }
01663         tp[i] = 0;    /* Terminate the LFN str by a \0 */
01664     }
01665 #endif
01666 }
01667 #endif /* _FS_MINIMIZE <= 1 */
01668 
01669 
01670 
01671 
01672 /*-----------------------------------------------------------------------*/
01673 /* Follow a file path                                                    */
01674 /*-----------------------------------------------------------------------*/
01675 
01676 static
01677 FRESULT follow_path (    /* FR_OK(0): successful, !=0: error code */
01678     DIR *dj,            /* Directory object to return last directory and found object */
01679     const TCHAR *path    /* Full-path string to find a file or directory */
01680 )
01681 {
01682     FRESULT res;
01683     BYTE *dir, ns;
01684 
01685 
01686 #if _FS_RPATH
01687     if (*path == '/' || *path == '\\') { /* There is a heading separator */
01688         path++;    dj->sclust = 0;        /* Strip it and start from the root dir */
01689     } else {                            /* No heading separator */
01690         dj->sclust = dj->fs->cdir;    /* Start from the current dir */
01691     }
01692 #else
01693     if (*path == '/' || *path == '\\')    /* Strip heading separator if exist */
01694         path++;
01695     dj->sclust = 0;                        /* Start from the root dir */
01696 #endif
01697 
01698     if ((UINT)*path < ' ') {            /* Nul path means the start directory itself */
01699         res = dir_sdi(dj, 0);
01700         dj->dir = 0;
01701 
01702     } else {                            /* Follow path */
01703         for (;;) {
01704             res = create_name(dj, &path);    /* Get a segment */
01705             if (res != FR_OK) break;
01706             res = dir_find(dj);                /* Find it */
01707             ns = *(dj->fn+NS);
01708             if (res != FR_OK) {                /* Failed to find the object */
01709                 if (res != FR_NO_FILE) break;    /* Abort if any hard error occured */
01710                 /* Object not found */
01711                 if (_FS_RPATH && (ns & NS_DOT)) {    /* If dot entry is not exit */
01712                     dj->sclust = 0; dj->dir = 0;    /* It is the root dir */
01713                     res = FR_OK;
01714                     if (!(ns & NS_LAST)) continue;
01715                 } else {                            /* Could not find the object */
01716                     if (!(ns & NS_LAST)) res = FR_NO_PATH;
01717                 }
01718                 break;
01719             }
01720             if (ns & NS_LAST) break;            /* Last segment match. Function completed. */
01721             dir = dj->dir;                        /* There is next segment. Follow the sub directory */
01722             if (!(dir[DIR_Attr] & AM_DIR)) {    /* Cannot follow because it is a file */
01723                 res = FR_NO_PATH; break;
01724             }
01725             dj->sclust = LD_CLUST(dir);
01726         }
01727     }
01728 
01729     return res;
01730 }
01731 
01732 
01733 
01734 
01735 /*-----------------------------------------------------------------------*/
01736 /* Load boot record and check if it is an FAT boot record                */
01737 /*-----------------------------------------------------------------------*/
01738 
01739 static
01740 BYTE check_fs (    /* 0:The FAT BR, 1:Valid BR but not an FAT, 2:Not a BR, 3:Disk error */
01741     FATFS *fs,    /* File system object */
01742     DWORD sect    /* Sector# (lba) to check if it is an FAT boot record or not */
01743 )
01744 {
01745     if (disk_read(fs->drv, fs->win, sect, 1) != RES_OK)    /* Load boot record */
01746         return 3;
01747     if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55)        /* Check record signature (always placed at offset 510 even if the sector size is >512) */
01748         return 2;
01749 
01750     if ((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146)    /* Check "FAT" string */
01751         return 0;
01752     if ((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146)
01753         return 0;
01754 
01755     return 1;
01756 }
01757 
01758 
01759 
01760 
01761 /*-----------------------------------------------------------------------*/
01762 /* Check if the file system object is valid or not                       */
01763 /*-----------------------------------------------------------------------*/
01764 
01765 static
01766 FRESULT chk_mounted (    /* FR_OK(0): successful, !=0: any error occurred */
01767     const TCHAR **path,    /* Pointer to pointer to the path name (drive number) */
01768     FATFS **rfs,        /* Pointer to pointer to the found file system object */
01769     BYTE chk_wp            /* !=0: Check media write protection for write access */
01770 )
01771 {
01772     BYTE fmt, b, *tbl;
01773     UINT vol;
01774     DSTATUS stat;
01775     DWORD bsect, fasize, tsect, sysect, nclst, szbfat;
01776     WORD nrsv;
01777     const TCHAR *p = *path;
01778     FATFS *fs;
01779 
01780     /* Get logical drive number from the path name */
01781     vol = p[0] - '0';                    /* Is there a drive number? */
01782     if (vol <= 9 && p[1] == ':') {        /* Found a drive number, get and strip it */
01783         p += 2; *path = p;                /* Return pointer to the path name */
01784     } else {                            /* No drive number is given */
01785 #if _FS_RPATH
01786         vol = CurrVol;                    /* Use current drive */
01787 #else
01788         vol = 0;                        /* Use drive 0 */
01789 #endif
01790     }
01791 
01792     /* Check if the logical drive is valid or not */
01793     if (vol >= _VOLUMES)                 /* Is the drive number valid? */
01794         return FR_INVALID_DRIVE;
01795     *rfs = fs = FatFs[vol];                /* Return pointer to the corresponding file system object */
01796     if (!fs) return FR_NOT_ENABLED;        /* Is the file system object available? */
01797 
01798     ENTER_FF(fs);                        /* Lock file system */
01799 
01800     if (fs->fs_type) {                    /* If the logical drive has been mounted */
01801         stat = disk_status(fs->drv);
01802         if (!(stat & STA_NOINIT)) {        /* and the physical drive is kept initialized (has not been changed), */
01803 #if !_FS_READONLY
01804             if (chk_wp && (stat & STA_PROTECT))    /* Check write protection if needed */
01805                 return FR_WRITE_PROTECTED;
01806 #endif
01807             return FR_OK;                /* The file system object is valid */
01808         }
01809     }
01810 
01811     /* The logical drive must be mounted. */
01812     /* Following code attempts to mount a volume. (analyze BPB and initialize the fs object) */
01813 
01814     fs->fs_type = 0;                    /* Clear the file system object */
01815     fs->drv = (BYTE)LD2PD(vol);            /* Bind the logical drive and a physical drive */
01816     stat = disk_initialize(fs->drv);    /* Initialize low level disk I/O layer */
01817     if (stat & STA_NOINIT)                /* Check if the initialization succeeded */
01818         return FR_NOT_READY;            /* Failed to initialize due to no media or hard error */
01819 #if _MAX_SS != 512                        /* Get disk sector size (variable sector size cfg only) */
01820     if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &fs->ssize) != RES_OK)
01821         return FR_DISK_ERR;
01822 #endif
01823 #if !_FS_READONLY
01824     if (chk_wp && (stat & STA_PROTECT))    /* Check disk write protection if needed */
01825         return FR_WRITE_PROTECTED;
01826 #endif
01827     /* Search FAT partition on the drive. Supports only generic partitionings, FDISK and SFD. */
01828     fmt = check_fs(fs, bsect = 0);        /* Check sector 0 if it is a VBR */
01829     if (fmt == 1) {                        /* Not an FAT-VBR, the disk may be partitioned */
01830         /* Check the partition listed in top of the partition table */
01831         tbl = &fs->win[MBR_Table + LD2PT(vol) * 16];    /* Partition table */
01832         if (tbl[4]) {                                    /* Is the partition existing? */
01833             bsect = LD_DWORD(&tbl[8]);                    /* Partition offset in LBA */
01834             fmt = check_fs(fs, bsect);                    /* Check the partition */
01835         }
01836     }
01837     if (fmt == 3) return FR_DISK_ERR;
01838     if (fmt) return FR_NO_FILESYSTEM;                    /* No FAT volume is found */
01839 
01840     /* Following code initializes the file system object */
01841 
01842     if (LD_WORD(fs->win+BPB_BytsPerSec) != SS(fs))        /* (BPB_BytsPerSec must be equal to the physical sector size) */
01843         return FR_NO_FILESYSTEM;
01844 
01845     fasize = LD_WORD(fs->win+BPB_FATSz16);                /* Number of sectors per FAT */
01846     if (!fasize) fasize = LD_DWORD(fs->win+BPB_FATSz32);
01847     fs->fsize = fasize;
01848 
01849     fs->n_fats = b = fs->win[BPB_NumFATs];                /* Number of FAT copies */
01850     if (b != 1 && b != 2) return FR_NO_FILESYSTEM;        /* (Must be 1 or 2) */
01851     fasize *= b;                                        /* Number of sectors for FAT area */
01852 
01853     fs->csize = b = fs->win[BPB_SecPerClus];            /* Number of sectors per cluster */
01854     if (!b || (b & (b - 1))) return FR_NO_FILESYSTEM;    /* (Must be power of 2) */
01855 
01856     fs->n_rootdir = LD_WORD(fs->win+BPB_RootEntCnt);    /* Number of root directory entries */
01857     if (fs->n_rootdir % (SS(fs) / 32)) return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must be sector aligned) */
01858 
01859     tsect = LD_WORD(fs->win+BPB_TotSec16);                /* Number of sectors on the volume */
01860     if (!tsect) tsect = LD_DWORD(fs->win+BPB_TotSec32);
01861 
01862     nrsv = LD_WORD(fs->win+BPB_RsvdSecCnt);                /* Number of reserved sectors */
01863     if (!nrsv) return FR_NO_FILESYSTEM;                    /* (BPB_RsvdSecCnt must not be 0) */
01864 
01865     /* Determine the FAT sub type */
01866     sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / 32);    /* RSV+FAT+DIR */
01867     if (tsect < sysect) return FR_NO_FILESYSTEM;        /* (Invalid volume size) */
01868     nclst = (tsect - sysect) / fs->csize;                /* Number of clusters */
01869     if (!nclst) return FR_NO_FILESYSTEM;                /* (Invalid volume size) */
01870     fmt = FS_FAT12;
01871     if (nclst >= MIN_FAT16) fmt = FS_FAT16;
01872     if (nclst >= MIN_FAT32) fmt = FS_FAT32;
01873 
01874     /* Boundaries and Limits */
01875     fs->n_fatent = nclst + 2;                            /* Number of FAT entries */
01876     fs->database = bsect + sysect;                        /* Data start sector */
01877     fs->fatbase = bsect + nrsv;                         /* FAT start sector */
01878     if (fmt == FS_FAT32) {
01879         if (fs->n_rootdir) return FR_NO_FILESYSTEM;        /* (BPB_RootEntCnt must be 0) */
01880         fs->dirbase = LD_DWORD(fs->win+BPB_RootClus);    /* Root directory start cluster */
01881         szbfat = fs->n_fatent * 4;                        /* (Required FAT size) */
01882     } else {
01883         if (!fs->n_rootdir)    return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must not be 0) */
01884         fs->dirbase = fs->fatbase + fasize;                /* Root directory start sector */
01885         szbfat = (fmt == FS_FAT16) ?                    /* (Required FAT size) */
01886             fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
01887     }
01888     if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs))    /* (FAT size must not be less than FAT sectors */
01889         return FR_NO_FILESYSTEM;
01890 
01891 #if !_FS_READONLY
01892     /* Initialize cluster allocation information */
01893     fs->free_clust = 0xFFFFFFFF;
01894     fs->last_clust = 0;
01895 
01896     /* Get fsinfo if available */
01897     if (fmt == FS_FAT32) {
01898          fs->fsi_flag = 0;
01899         fs->fsi_sector = bsect + LD_WORD(fs->win+BPB_FSInfo);
01900         if (disk_read(fs->drv, fs->win, fs->fsi_sector, 1) == RES_OK &&
01901             LD_WORD(fs->win+BS_55AA) == 0xAA55 &&
01902             LD_DWORD(fs->win+FSI_LeadSig) == 0x41615252 &&
01903             LD_DWORD(fs->win+FSI_StrucSig) == 0x61417272) {
01904                 fs->last_clust = LD_DWORD(fs->win+FSI_Nxt_Free);
01905                 fs->free_clust = LD_DWORD(fs->win+FSI_Free_Count);
01906         }
01907     }
01908 #endif
01909     fs->fs_type = fmt;        /* FAT sub-type */
01910     fs->id = ++Fsid;        /* File system mount ID */
01911     fs->winsect = 0;        /* Invalidate sector cache */
01912     fs->wflag = 0;
01913 #if _FS_RPATH
01914     fs->cdir = 0;            /* Current directory (root dir) */
01915 #endif
01916 #if _FS_SHARE                /* Clear file lock semaphores */
01917     clear_lock(fs);
01918 #endif
01919 
01920     return FR_OK;
01921 }
01922 
01923 
01924 
01925 
01926 /*-----------------------------------------------------------------------*/
01927 /* Check if the file/dir object is valid or not                          */
01928 /*-----------------------------------------------------------------------*/
01929 
01930 static
01931 FRESULT validate (    /* FR_OK(0): The object is valid, !=0: Invalid */
01932     FATFS *fs,        /* Pointer to the file system object */
01933     WORD id            /* Member id of the target object to be checked */
01934 )
01935 {
01936     if (!fs || !fs->fs_type || fs->id != id)
01937         return FR_INVALID_OBJECT;
01938 
01939     ENTER_FF(fs);        /* Lock file system */
01940 
01941     if (disk_status(fs->drv) & STA_NOINIT)
01942         return FR_NOT_READY;
01943 
01944     return FR_OK;
01945 }
01946 
01947 
01948 
01949 
01950 /*--------------------------------------------------------------------------
01951 
01952    Public Functions
01953 
01954 --------------------------------------------------------------------------*/
01955 
01956 
01957 
01958 /*-----------------------------------------------------------------------*/
01959 /* Mount/Unmount a Logical Drive                                         */
01960 /*-----------------------------------------------------------------------*/
01961 
01962 FRESULT f_mount (
01963     BYTE vol,        /* Logical drive number to be mounted/unmounted */
01964     FATFS *fs        /* Pointer to new file system object (NULL for unmount)*/
01965 )
01966 {
01967     FATFS *rfs;
01968 
01969 
01970     if (vol >= _VOLUMES)            /* Check if the drive number is valid */
01971         return FR_INVALID_DRIVE;
01972     rfs = FatFs[vol];                /* Get current fs object */
01973 
01974     if (rfs) {
01975 #if _FS_SHARE
01976         clear_lock(rfs);
01977 #endif
01978 #if _FS_REENTRANT                    /* Discard sync object of the current volume */
01979         if (!ff_del_syncobj(rfs->sobj)) return FR_INT_ERR;
01980 #endif
01981         rfs->fs_type = 0;            /* Clear old fs object */
01982     }
01983 
01984     if (fs) {
01985         fs->fs_type = 0;            /* Clear new fs object */
01986 #if _FS_REENTRANT                    /* Create sync object for the new volume */
01987         if (!ff_cre_syncobj(vol, &fs->sobj)) return FR_INT_ERR;
01988 #endif
01989     }
01990     FatFs[vol] = fs;                /* Register new fs object */
01991 
01992     return FR_OK;
01993 }
01994 
01995 
01996 
01997 
01998 /*-----------------------------------------------------------------------*/
01999 /* Open or Create a File                                                 */
02000 /*-----------------------------------------------------------------------*/
02001 
02002 FRESULT f_open (
02003     FIL *fp,            /* Pointer to the blank file object */
02004     const TCHAR *path,    /* Pointer to the file name */
02005     BYTE mode            /* Access mode and file open mode flags */
02006 )
02007 {
02008     FRESULT res;
02009     DIR dj;
02010     BYTE *dir;
02011     DEF_NAMEBUF;
02012 
02013 
02014     fp->fs = 0;            /* Clear file object */
02015 
02016 #if !_FS_READONLY
02017     mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
02018     res = chk_mounted(&path, &dj.fs, (BYTE)(mode & ~FA_READ));
02019 #else
02020     mode &= FA_READ;
02021     res = chk_mounted(&path, &dj.fs, 0);
02022 #endif
02023     INIT_BUF(dj);
02024     if (res == FR_OK)
02025         res = follow_path(&dj, path);    /* Follow the file path */
02026     dir = dj.dir;
02027 
02028 #if !_FS_READONLY    /* R/W configuration */
02029     if (res == FR_OK) {
02030         if (!dir)    /* Current dir itself */
02031             res = FR_INVALID_NAME;
02032 #if _FS_SHARE
02033         else
02034             res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
02035 #endif
02036     }
02037     /* Create or Open a file */
02038     if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
02039         DWORD dw, cl;
02040 
02041         if (res != FR_OK) {                    /* No file, create new */
02042             if (res == FR_NO_FILE)            /* There is no file to open, create a new entry */
02043 #if _FS_SHARE
02044                 res = enq_lock(dj.fs) ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
02045 #else
02046                 res = dir_register(&dj);
02047 #endif
02048             mode |= FA_CREATE_ALWAYS;        /* File is created */
02049             dir = dj.dir;                    /* New entry */
02050         }
02051         else {                                /* Any object is already existing */
02052             if (mode & FA_CREATE_NEW) {        /* Cannot create new */
02053                 res = FR_EXIST;
02054             } else {
02055                 if (dir[DIR_Attr] & (AM_RDO | AM_DIR))    /* Cannot overwrite it (R/O or DIR) */
02056                     res = FR_DENIED;
02057             }
02058         }
02059         if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {    /* Truncate it if overwrite mode */
02060             dw = get_fattime();                    /* Created time */
02061             ST_DWORD(dir+DIR_CrtTime, dw);
02062             dir[DIR_Attr] = 0;                    /* Reset attribute */
02063             ST_DWORD(dir+DIR_FileSize, 0);        /* size = 0 */
02064             cl = LD_CLUST(dir);                    /* Get start cluster */
02065             ST_CLUST(dir, 0);                    /* cluster = 0 */
02066             dj.fs->wflag = 1;
02067             if (cl) {                            /* Remove the cluster chain if exist */
02068                 dw = dj.fs->winsect;
02069                 res = remove_chain(dj.fs, cl);
02070                 if (res == FR_OK) {
02071                     dj.fs->last_clust = cl - 1;    /* Reuse the cluster hole */
02072                     res = move_window(dj.fs, dw);
02073                 }
02074             }
02075         }
02076     }
02077     else {    /* Open an existing file */
02078         if (res == FR_OK) {                        /* Follow succeeded */
02079             if (dir[DIR_Attr] & AM_DIR) {        /* It is a directory */
02080                 res = FR_NO_FILE;
02081             } else {
02082                 if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
02083                     res = FR_DENIED;
02084             }
02085         }
02086     }
02087     if (res == FR_OK) {
02088         if (mode & FA_CREATE_ALWAYS)            /* Set file change flag if created or overwritten */
02089             mode |= FA__WRITTEN;
02090         fp->dir_sect = dj.fs->winsect;            /* Pointer to the directory entry */
02091         fp->dir_ptr = dir;
02092 #if _FS_SHARE
02093         fp->lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
02094         if (!fp->lockid) res = FR_INT_ERR;
02095 #endif
02096     }
02097 
02098 #else                /* R/O configuration */
02099     if (res == FR_OK) {                    /* Follow succeeded */
02100         if (!dir) {                        /* Current dir itself */
02101             res = FR_INVALID_NAME;
02102         } else {
02103             if (dir[DIR_Attr] & AM_DIR)    /* It is a directory */
02104                 res = FR_NO_FILE;
02105         }
02106     }
02107 #endif
02108     FREE_BUF();
02109 
02110     if (res == FR_OK) {
02111         fp->flag = mode;                    /* File access mode */
02112         fp->org_clust =    LD_CLUST(dir);        /* File start cluster */
02113         fp->fsize = LD_DWORD(dir+DIR_FileSize);    /* File size */
02114         fp->fptr = 0;                        /* File pointer */
02115         fp->dsect = 0;
02116 #if _USE_FASTSEEK
02117         fp->cltbl = 0;                        /* No cluster link map table */
02118 #endif
02119         fp->fs = dj.fs; fp->id = dj.fs->id;    /* Validate file object */
02120     }
02121 
02122     LEAVE_FF(dj.fs, res);
02123 }
02124 
02125 
02126 
02127 
02128 /*-----------------------------------------------------------------------*/
02129 /* Read File                                                             */
02130 /*-----------------------------------------------------------------------*/
02131 
02132 FRESULT f_read (
02133     FIL *fp,         /* Pointer to the file object */
02134     void *buff,        /* Pointer to data buffer */
02135     UINT btr,        /* Number of bytes to read */
02136     UINT *br        /* Pointer to number of bytes read */
02137 )
02138 {
02139     FRESULT res;
02140     DWORD clst, sect, remain;
02141     UINT rcnt, cc;
02142     BYTE csect, *rbuff = (BYTE *)buff;
02143 
02144 
02145     *br = 0;    /* Initialize byte counter */
02146 
02147     res = validate(fp->fs, fp->id);                    /* Check validity of the object */
02148     if (res != FR_OK) LEAVE_FF(fp->fs, res);
02149     if (fp->flag & FA__ERROR)                        /* Check abort flag */
02150         LEAVE_FF(fp->fs, FR_INT_ERR);
02151     if (!(fp->flag & FA_READ))                         /* Check access mode */
02152         LEAVE_FF(fp->fs, FR_DENIED);
02153     remain = fp->fsize - fp->fptr;
02154     if (btr > remain) btr = (UINT)remain;            /* Truncate btr by remaining bytes */
02155 
02156     for ( ;  btr;                                    /* Repeat until all data transferred */
02157         rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
02158         if ((fp->fptr % SS(fp->fs)) == 0) {            /* On the sector boundary? */
02159             csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
02160             if (!csect) {                            /* On the cluster boundary? */
02161                 clst = (fp->fptr == 0) ?            /* On the top of the file? */
02162                     fp->org_clust : get_fat(fp->fs, fp->curr_clust);
02163                 if (clst <= 1) ABORT(fp->fs, FR_INT_ERR);
02164                 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
02165                 fp->curr_clust = clst;                /* Update current cluster */
02166             }
02167             sect = clust2sect(fp->fs, fp->curr_clust);    /* Get current sector */
02168             if (!sect) ABORT(fp->fs, FR_INT_ERR);
02169             sect += csect;
02170             cc = btr / SS(fp->fs);                    /* When remaining bytes >= sector size, */
02171             if (cc) {                                /* Read maximum contiguous sectors directly */
02172                 if (csect + cc > fp->fs->csize)        /* Clip at cluster boundary */
02173                     cc = fp->fs->csize - csect;
02174                 if (disk_read(fp->fs->drv, rbuff, sect, (BYTE)cc) != RES_OK)
02175                     ABORT(fp->fs, FR_DISK_ERR);
02176 #if !_FS_READONLY && _FS_MINIMIZE <= 2                /* Replace one of the read sectors with cached data if it contains a dirty sector */
02177 #if _FS_TINY
02178                 if (fp->fs->wflag && fp->fs->winsect - sect < cc)
02179                     mem_cpy(rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs));
02180 #else
02181                 if ((fp->flag & FA__DIRTY) && fp->dsect - sect < cc)
02182                     mem_cpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs));
02183 #endif
02184 #endif
02185                 rcnt = SS(fp->fs) * cc;                /* Number of bytes transferred */
02186                 continue;
02187             }
02188 #if !_FS_TINY
02189 #if !_FS_READONLY
02190             if (fp->flag & FA__DIRTY) {                /* Write sector I/O buffer if needed */
02191                 if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
02192                     ABORT(fp->fs, FR_DISK_ERR);
02193                 fp->flag &= ~FA__DIRTY;
02194             }
02195 #endif
02196             if (fp->dsect != sect) {                /* Fill sector buffer with file data */
02197                 if (disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)
02198                     ABORT(fp->fs, FR_DISK_ERR);
02199             }
02200 #endif
02201             fp->dsect = sect;
02202         }
02203         rcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs));    /* Get partial sector data from sector buffer */
02204         if (rcnt > btr) rcnt = btr;
02205 #if _FS_TINY
02206         if (move_window(fp->fs, fp->dsect))            /* Move sector window */
02207             ABORT(fp->fs, FR_DISK_ERR);
02208         mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt);    /* Pick partial sector */
02209 #else
02210         mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt);    /* Pick partial sector */
02211 #endif
02212     }
02213 
02214     LEAVE_FF(fp->fs, FR_OK);
02215 }
02216 
02217 
02218 
02219 
02220 #if !_FS_READONLY
02221 /*-----------------------------------------------------------------------*/
02222 /* Write File                                                            */
02223 /*-----------------------------------------------------------------------*/
02224 
02225 FRESULT f_write (
02226     FIL *fp,            /* Pointer to the file object */
02227     const void *buff,    /* Pointer to the data to be written */
02228     UINT btw,            /* Number of bytes to write */
02229     UINT *bw            /* Pointer to number of bytes written */
02230 )
02231 {
02232     FRESULT res;
02233     DWORD clst, sect;
02234     UINT wcnt, cc;
02235     const BYTE *wbuff = (const BYTE *)buff;
02236     BYTE csect;
02237 
02238 
02239     *bw = 0;    /* Initialize byte counter */
02240 
02241     res = validate(fp->fs, fp->id);                    /* Check validity of the object */
02242     if (res != FR_OK) LEAVE_FF(fp->fs, res);
02243     if (fp->flag & FA__ERROR)                        /* Check abort flag */
02244         LEAVE_FF(fp->fs, FR_INT_ERR);
02245     if (!(fp->flag & FA_WRITE))                        /* Check access mode */
02246         LEAVE_FF(fp->fs, FR_DENIED);
02247     if (fp->fsize + btw < fp->fsize) btw = 0;        /* File size cannot reach 4GB */
02248 
02249     for ( ;  btw;                                    /* Repeat until all data transferred */
02250         wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
02251         if ((fp->fptr % SS(fp->fs)) == 0) {            /* On the sector boundary? */
02252             csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
02253             if (!csect) {                            /* On the cluster boundary? */
02254                 if (fp->fptr == 0) {                /* On the top of the file? */
02255                     clst = fp->org_clust;            /* Follow from the origin */
02256                     if (clst == 0)                    /* When there is no cluster chain, */
02257                         fp->org_clust = clst = create_chain(fp->fs, 0);    /* Create a new cluster chain */
02258                 } else {                            /* Middle or end of the file */
02259                     clst = create_chain(fp->fs, fp->curr_clust);            /* Follow or stretch cluster chain */
02260                 }
02261                 if (clst == 0) break;                /* Could not allocate a new cluster (disk full) */
02262                 if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
02263                 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
02264                 fp->curr_clust = clst;                /* Update current cluster */
02265             }
02266 #if _FS_TINY
02267             if (fp->fs->winsect == fp->dsect && move_window(fp->fs, 0))    /* Write back data buffer prior to following direct transfer */
02268                 ABORT(fp->fs, FR_DISK_ERR);
02269 #else
02270             if (fp->flag & FA__DIRTY) {        /* Write back data buffer prior to following direct transfer */
02271                 if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
02272                     ABORT(fp->fs, FR_DISK_ERR);
02273                 fp->flag &= ~FA__DIRTY;
02274             }
02275 #endif
02276             sect = clust2sect(fp->fs, fp->curr_clust);    /* Get current sector */
02277             if (!sect) ABORT(fp->fs, FR_INT_ERR);
02278             sect += csect;
02279             cc = btw / SS(fp->fs);                    /* When remaining bytes >= sector size, */
02280             if (cc) {                                /* Write maximum contiguous sectors directly */
02281                 if (csect + cc > fp->fs->csize)        /* Clip at cluster boundary */
02282                     cc = fp->fs->csize - csect;
02283                 if (disk_write(fp->fs->drv, wbuff, sect, (BYTE)cc) != RES_OK)
02284                     ABORT(fp->fs, FR_DISK_ERR);
02285 #if _FS_TINY
02286                 if (fp->fs->winsect - sect < cc) {    /* Refill sector cache if it gets dirty by the direct write */
02287                     mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
02288                     fp->fs->wflag = 0;
02289                 }
02290 #else
02291                 if (fp->dsect - sect < cc) {        /* Refill sector cache if it gets dirty by the direct write */
02292                     mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
02293                     fp->flag &= ~FA__DIRTY;
02294                 }
02295 #endif
02296                 wcnt = SS(fp->fs) * cc;                /* Number of bytes transferred */
02297                 continue;
02298             }
02299 #if _FS_TINY
02300             if (fp->fptr >= fp->fsize) {            /* Avoid silly buffer filling at growing edge */
02301                 if (move_window(fp->fs, 0)) ABORT(fp->fs, FR_DISK_ERR);
02302                 fp->fs->winsect = sect;
02303             }
02304 #else
02305             if (fp->dsect != sect) {                /* Fill sector buffer with file data */
02306                 if (fp->fptr < fp->fsize &&
02307                     disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)
02308                         ABORT(fp->fs, FR_DISK_ERR);
02309             }
02310 #endif
02311             fp->dsect = sect;
02312         }
02313         wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs));/* Put partial sector into file I/O buffer */
02314         if (wcnt > btw) wcnt = btw;
02315 #if _FS_TINY
02316         if (move_window(fp->fs, fp->dsect))            /* Move sector window */
02317             ABORT(fp->fs, FR_DISK_ERR);
02318         mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt);    /* Fit partial sector */
02319         fp->fs->wflag = 1;
02320 #else
02321         mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt);    /* Fit partial sector */
02322         fp->flag |= FA__DIRTY;
02323 #endif
02324     }
02325 
02326     if (fp->fptr > fp->fsize) fp->fsize = fp->fptr;    /* Update file size if needed */
02327     fp->flag |= FA__WRITTEN;                        /* Set file change flag */
02328 
02329     LEAVE_FF(fp->fs, FR_OK);
02330 }
02331 
02332 
02333 
02334 
02335 /*-----------------------------------------------------------------------*/
02336 /* Synchronize the File Object                                           */
02337 /*-----------------------------------------------------------------------*/
02338 
02339 FRESULT f_sync (
02340     FIL *fp        /* Pointer to the file object */
02341 )
02342 {
02343     FRESULT res;
02344     DWORD tim;
02345     BYTE *dir;
02346 
02347 
02348     res = validate(fp->fs, fp->id);        /* Check validity of the object */
02349     if (res == FR_OK) {
02350         if (fp->flag & FA__WRITTEN) {    /* Has the file been written? */
02351 #if !_FS_TINY    /* Write-back dirty buffer */
02352             if (fp->flag & FA__DIRTY) {
02353                 if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
02354                     LEAVE_FF(fp->fs, FR_DISK_ERR);
02355                 fp->flag &= ~FA__DIRTY;
02356             }
02357 #endif
02358             /* Update the directory entry */
02359             res = move_window(fp->fs, fp->dir_sect);
02360             if (res == FR_OK) {
02361                 dir = fp->dir_ptr;
02362                 dir[DIR_Attr] |= AM_ARC;                    /* Set archive bit */
02363                 ST_DWORD(dir+DIR_FileSize, fp->fsize);        /* Update file size */
02364                 ST_CLUST(dir, fp->org_clust);                /* Update start cluster */
02365                 tim = get_fattime();                        /* Update updated time */
02366                 ST_DWORD(dir+DIR_WrtTime, tim);
02367                 fp->flag &= ~FA__WRITTEN;
02368                 fp->fs->wflag = 1;
02369                 res = sync(fp->fs);
02370             }
02371         }
02372     }
02373 
02374     LEAVE_FF(fp->fs, res);
02375 }
02376 
02377 #endif /* !_FS_READONLY */
02378 
02379 
02380 
02381 
02382 /*-----------------------------------------------------------------------*/
02383 /* Close File                                                            */
02384 /*-----------------------------------------------------------------------*/
02385 
02386 FRESULT f_close (
02387     FIL *fp        /* Pointer to the file object to be closed */
02388 )
02389 {
02390     FRESULT res;
02391 
02392 #if _FS_READONLY
02393     FATFS *fs = fp->fs;
02394     res = validate(fs, fp->id);
02395     if (res == FR_OK) fp->fs = 0;    /* Discard file object */
02396     LEAVE_FF(fs, res);
02397 
02398 #else
02399     res = f_sync(fp);        /* Flush cached data */
02400 #if _FS_SHARE
02401     if (res == FR_OK) {        /* Decrement open counter */
02402 #if _FS_REENTRANT
02403         res = validate(fp->fs, fp->id);
02404         if (res == FR_OK) {
02405             res = dec_lock(fp->lockid);    
02406             unlock_fs(fp->fs, FR_OK);
02407         }
02408 #else
02409         res = dec_lock(fp->lockid);
02410 #endif
02411     }
02412 #endif
02413     if (res == FR_OK) fp->fs = 0;    /* Discard file object */
02414     return res;
02415 #endif
02416 }
02417 
02418 
02419 
02420 
02421 /*-----------------------------------------------------------------------*/
02422 /* Current Drive/Directory Handlings                                     */
02423 /*-----------------------------------------------------------------------*/
02424 
02425 #if _FS_RPATH >= 1
02426 
02427 FRESULT f_chdrive (
02428     BYTE drv        /* Drive number */
02429 )
02430 {
02431     if (drv >= _VOLUMES) return FR_INVALID_DRIVE;
02432 
02433     CurrVol = drv;
02434 
02435     return FR_OK;
02436 }
02437 
02438 
02439 
02440 FRESULT f_chdir (
02441     const TCHAR *path    /* Pointer to the directory path */
02442 )
02443 {
02444     FRESULT res;
02445     DIR dj;
02446     DEF_NAMEBUF;
02447 
02448 
02449     res = chk_mounted(&path, &dj.fs, 0);
02450     if (res == FR_OK) {
02451         INIT_BUF(dj);
02452         res = follow_path(&dj, path);        /* Follow the path */
02453         FREE_BUF();
02454         if (res == FR_OK) {                    /* Follow completed */
02455             if (!dj.dir) {
02456                 dj.fs->cdir = dj.sclust;    /* Start directory itself */
02457             } else {
02458                 if (dj.dir[DIR_Attr] & AM_DIR)    /* Reached to the directory */
02459                     dj.fs->cdir = LD_CLUST(dj.dir);
02460                 else
02461                     res = FR_NO_PATH;        /* Reached but a file */
02462             }
02463         }
02464         if (res == FR_NO_FILE) res = FR_NO_PATH;
02465     }
02466 
02467     LEAVE_FF(dj.fs, res);
02468 }
02469 
02470 
02471 #if _FS_RPATH >= 2
02472 FRESULT f_getcwd (
02473     TCHAR *path,    /* Pointer to the directory path */
02474     UINT sz_path    /* Size of path */
02475 )
02476 {
02477     FRESULT res;
02478     DIR dj;
02479     UINT i, n;
02480     DWORD ccl;
02481     TCHAR *tp;
02482     FILINFO fno;
02483     DEF_NAMEBUF;
02484 
02485 
02486     *path = 0;
02487     res = chk_mounted((const TCHAR**)&path, &dj.fs, 0);    /* Get current volume */
02488     if (res == FR_OK) {
02489         INIT_BUF(dj);
02490         i = sz_path;        /* Bottom of buffer (dir stack base) */
02491         dj.sclust = dj.fs->cdir;            /* Start to follow upper dir from current dir */
02492         while ((ccl = dj.sclust) != 0) {    /* Repeat while current dir is a sub-dir */
02493             res = dir_sdi(&dj, 1);            /* Get parent dir */
02494             if (res != FR_OK) break;
02495             res = dir_read(&dj);
02496             if (res != FR_OK) break;
02497             dj.sclust = LD_CLUST(dj.dir);    /* Goto parent dir */
02498             res = dir_sdi(&dj, 0);
02499             if (res != FR_OK) break;
02500             do {                            /* Find the entry links to the child dir */
02501                 res = dir_read(&dj);
02502                 if (res != FR_OK) break;
02503                 if (ccl == LD_CLUST(dj.dir)) break;    /* Found the entry */
02504                 res = dir_next(&dj, 0);    
02505             } while (res == FR_OK);
02506             if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
02507             if (res != FR_OK) break;
02508 #if _USE_LFN
02509             fno.lfname = path;
02510             fno.lfsize = i;
02511 #endif
02512             get_fileinfo(&dj, &fno);        /* Get the dir name and push it to the buffer */
02513             tp = fno.fname;
02514             if (_USE_LFN && *path) tp = path;
02515             for (n = 0; tp[n]; n++) ;
02516             if (i < n + 3) {
02517                 res = FR_NOT_ENOUGH_CORE; break;
02518             }
02519             while (n) path[--i] = tp[--n];
02520             path[--i] = '/';
02521         }
02522         tp = path;
02523         if (res == FR_OK) {
02524             *tp++ = '0' + CurrVol;            /* Put drive number */
02525             *tp++ = ':';
02526             if (i == sz_path) {                /* Root-dir */
02527                 *tp++ = '/';
02528             } else {                        /* Sub-dir */
02529                 do        /* Add stacked path str */
02530                     *tp++ = path[i++];
02531                 while (i < sz_path);
02532             }
02533         }
02534         *tp = 0;
02535         FREE_BUF();
02536     }
02537 
02538     LEAVE_FF(dj.fs, res);
02539 }
02540 #endif /* _FS_RPATH >= 2 */
02541 #endif /* _FS_RPATH >= 1 */
02542 
02543 
02544 
02545 #if _FS_MINIMIZE <= 2
02546 /*-----------------------------------------------------------------------*/
02547 /* Seek File R/W Pointer                                                 */
02548 /*-----------------------------------------------------------------------*/
02549 
02550 FRESULT f_lseek (
02551     FIL *fp,        /* Pointer to the file object */
02552     DWORD ofs        /* File pointer from top of file */
02553 )
02554 {
02555     FRESULT res;
02556 
02557 
02558     res = validate(fp->fs, fp->id);        /* Check validity of the object */
02559     if (res != FR_OK) LEAVE_FF(fp->fs, res);
02560     if (fp->flag & FA__ERROR)            /* Check abort flag */
02561         LEAVE_FF(fp->fs, FR_INT_ERR);
02562 
02563 #if _USE_FASTSEEK
02564     if (fp->cltbl) {    /* Fast seek */
02565         DWORD cl, pcl, ncl, tcl, dsc, tlen, *tbl = fp->cltbl;
02566         BYTE csc;
02567 
02568         tlen = *tbl++;
02569         if (ofs == CREATE_LINKMAP) {    /* Create link map table */
02570             cl = fp->org_clust;
02571             if (cl) {
02572                 do {
02573                     if (tlen < 4) {    /* Not enough table items */
02574                         res = FR_NOT_ENOUGH_CORE; break;
02575                     }
02576                     tcl = cl; ncl = 0;
02577                     do {        /* Get a fragment and store the top and length */
02578                         pcl = cl; ncl++;
02579                         cl = get_fat(fp->fs, cl);
02580                         if (cl <= 1) ABORT(fp->fs, FR_INT_ERR);
02581                         if (cl == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
02582                     } while (cl == pcl + 1);
02583                     *tbl++ = ncl; *tbl++ = tcl;
02584                     tlen -= 2;
02585                 } while (cl < fp->fs->n_fatent);
02586             }
02587             *tbl = 0;    /* Terminate table */
02588 
02589         } else {                        /* Fast seek */
02590             if (ofs > fp->fsize)        /* Clip offset at the file size */
02591                 ofs = fp->fsize;
02592             fp->fptr = ofs;                /* Set file pointer */
02593             if (ofs) {
02594                 dsc = (ofs - 1) / SS(fp->fs);
02595                 cl = dsc / fp->fs->csize;
02596                 for (;;) {
02597                     ncl = *tbl++;
02598                     if (!ncl) ABORT(fp->fs, FR_INT_ERR);
02599                     if (cl < ncl) break;
02600                     cl -= ncl; tbl++;
02601                 }
02602                 fp->curr_clust = cl + *tbl;
02603                 csc = (BYTE)(dsc & (fp->fs->csize - 1));
02604                 dsc = clust2sect(fp->fs, fp->curr_clust);
02605                 if (!dsc) ABORT(fp->fs, FR_INT_ERR);
02606                 dsc += csc;
02607                 if (fp->fptr % SS(fp->fs) && dsc != fp->dsect) {
02608 #if !_FS_TINY
02609 #if !_FS_READONLY
02610                     if (fp->flag & FA__DIRTY) {        /* Flush dirty buffer if needed */
02611                         if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
02612                             ABORT(fp->fs, FR_DISK_ERR);
02613                         fp->flag &= ~FA__DIRTY;
02614                     }
02615 #endif
02616                     if (disk_read(fp->fs->drv, fp->buf, dsc, 1) != RES_OK)
02617                         ABORT(fp->fs, FR_DISK_ERR);
02618 #endif
02619                     fp->dsect = dsc;
02620                 }
02621             }
02622         }
02623     } else
02624 #endif
02625 
02626     /* Normal Seek */
02627     {
02628         DWORD clst, bcs, nsect, ifptr;
02629 
02630         if (ofs > fp->fsize                    /* In read-only mode, clip offset with the file size */
02631 #if !_FS_READONLY
02632              && !(fp->flag & FA_WRITE)
02633 #endif
02634             ) ofs = fp->fsize;
02635 
02636         ifptr = fp->fptr;
02637         fp->fptr = nsect = 0;
02638         if (ofs) {
02639             bcs = (DWORD)fp->fs->csize * SS(fp->fs);    /* Cluster size (byte) */
02640             if (ifptr > 0 &&
02641                 (ofs - 1) / bcs >= (ifptr - 1) / bcs) {    /* When seek to same or following cluster, */
02642                 fp->fptr = (ifptr - 1) & ~(bcs - 1);    /* start from the current cluster */
02643                 ofs -= fp->fptr;
02644                 clst = fp->curr_clust;
02645             } else {                                    /* When seek to back cluster, */
02646                 clst = fp->org_clust;                    /* start from the first cluster */
02647 #if !_FS_READONLY
02648                 if (clst == 0) {                        /* If no cluster chain, create a new chain */
02649                     clst = create_chain(fp->fs, 0);
02650                     if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
02651                     if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
02652                     fp->org_clust = clst;
02653                 }
02654 #endif
02655                 fp->curr_clust = clst;
02656             }
02657             if (clst != 0) {
02658                 while (ofs > bcs) {                        /* Cluster following loop */
02659 #if !_FS_READONLY
02660                     if (fp->flag & FA_WRITE) {            /* Check if in write mode or not */
02661                         clst = create_chain(fp->fs, clst);    /* Force stretch if in write mode */
02662                         if (clst == 0) {                /* When disk gets full, clip file size */
02663                             ofs = bcs; break;
02664                         }
02665                     } else
02666 #endif
02667                         clst = get_fat(fp->fs, clst);    /* Follow cluster chain if not in write mode */
02668                     if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
02669                     if (clst <= 1 || clst >= fp->fs->n_fatent) ABORT(fp->fs, FR_INT_ERR);
02670                     fp->curr_clust = clst;
02671                     fp->fptr += bcs;
02672                     ofs -= bcs;
02673                 }
02674                 fp->fptr += ofs;
02675                 if (ofs % SS(fp->fs)) {
02676                     nsect = clust2sect(fp->fs, clst);    /* Current sector */
02677                     if (!nsect) ABORT(fp->fs, FR_INT_ERR);
02678                     nsect += ofs / SS(fp->fs);
02679                 }
02680             }
02681         }
02682         if (fp->fptr % SS(fp->fs) && nsect != fp->dsect) {
02683 #if !_FS_TINY
02684 #if !_FS_READONLY
02685             if (fp->flag & FA__DIRTY) {            /* Flush dirty buffer if needed */
02686                 if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
02687                     ABORT(fp->fs, FR_DISK_ERR);
02688                 fp->flag &= ~FA__DIRTY;
02689             }
02690 #endif
02691             if (disk_read(fp->fs->drv, fp->buf, nsect, 1) != RES_OK)
02692                 ABORT(fp->fs, FR_DISK_ERR);
02693 #endif
02694             fp->dsect = nsect;
02695         }
02696 #if !_FS_READONLY
02697         if (fp->fptr > fp->fsize) {            /* Set change flag if the file size is extended */
02698             fp->fsize = fp->fptr;
02699             fp->flag |= FA__WRITTEN;
02700         }
02701 #endif
02702     }
02703 
02704     LEAVE_FF(fp->fs, res);
02705 }
02706 
02707 
02708 
02709 #if _FS_MINIMIZE <= 1
02710 /*-----------------------------------------------------------------------*/
02711 /* Create a Directroy Object                                             */
02712 /*-----------------------------------------------------------------------*/
02713 
02714 FRESULT f_opendir (
02715     DIR *dj,            /* Pointer to directory object to create */
02716     const TCHAR *path    /* Pointer to the directory path */
02717 )
02718 {
02719     FRESULT res;
02720     DEF_NAMEBUF;
02721 
02722 
02723     res = chk_mounted(&path, &dj->fs, 0);
02724     if (res == FR_OK) {
02725         INIT_BUF(*dj);
02726         res = follow_path(dj, path);            /* Follow the path to the directory */
02727         FREE_BUF();
02728         if (res == FR_OK) {                        /* Follow completed */
02729             if (dj->dir) {                        /* It is not the root dir */
02730                 if (dj->dir[DIR_Attr] & AM_DIR) {    /* The object is a directory */
02731                     dj->sclust = LD_CLUST(dj->dir);
02732                 } else {                        /* The object is not a directory */
02733                     res = FR_NO_PATH;
02734                 }
02735             }
02736             if (res == FR_OK) {
02737                 dj->id = dj->fs->id;
02738                 res = dir_sdi(dj, 0);            /* Rewind dir */
02739             }
02740         }
02741         if (res == FR_NO_FILE) res = FR_NO_PATH;
02742     }
02743 
02744     LEAVE_FF(dj->fs, res);
02745 }
02746 
02747 
02748 
02749 
02750 /*-----------------------------------------------------------------------*/
02751 /* Read Directory Entry in Sequense                                      */
02752 /*-----------------------------------------------------------------------*/
02753 
02754 FRESULT f_readdir (
02755     DIR *dj,            /* Pointer to the open directory object */
02756     FILINFO *fno        /* Pointer to file information to return */
02757 )
02758 {
02759     FRESULT res;
02760     DEF_NAMEBUF;
02761 
02762 
02763     res = validate(dj->fs, dj->id);            /* Check validity of the object */
02764     if (res == FR_OK) {
02765         if (!fno) {
02766             res = dir_sdi(dj, 0);            /* Rewind the directory object */
02767         } else {
02768             INIT_BUF(*dj);
02769             res = dir_read(dj);                /* Read an directory item */
02770             if (res == FR_NO_FILE) {        /* Reached end of dir */
02771                 dj->sect = 0;
02772                 res = FR_OK;
02773             }
02774             if (res == FR_OK) {                /* A valid entry is found */
02775                 get_fileinfo(dj, fno);        /* Get the object information */
02776                 res = dir_next(dj, 0);        /* Increment index for next */
02777                 if (res == FR_NO_FILE) {
02778                     dj->sect = 0;
02779                     res = FR_OK;
02780                 }
02781             }
02782             FREE_BUF();
02783         }
02784     }
02785 
02786     LEAVE_FF(dj->fs, res);
02787 }
02788 
02789 
02790 
02791 #if _FS_MINIMIZE == 0
02792 /*-----------------------------------------------------------------------*/
02793 /* Get File Status                                                       */
02794 /*-----------------------------------------------------------------------*/
02795 
02796 FRESULT f_stat (
02797     const TCHAR *path,    /* Pointer to the file path */
02798     FILINFO *fno        /* Pointer to file information to return */
02799 )
02800 {
02801     FRESULT res;
02802     DIR dj;
02803     DEF_NAMEBUF;
02804 
02805 
02806     res = chk_mounted(&path, &dj.fs, 0);
02807     if (res == FR_OK) {
02808         INIT_BUF(dj);
02809         res = follow_path(&dj, path);    /* Follow the file path */
02810         if (res == FR_OK) {                /* Follow completed */
02811             if (dj.dir)        /* Found an object */
02812                 get_fileinfo(&dj, fno);
02813             else            /* It is root dir */
02814                 res = FR_INVALID_NAME;
02815         }
02816         FREE_BUF();
02817     }
02818 
02819     LEAVE_FF(dj.fs, res);
02820 }
02821 
02822 
02823 
02824 #if !_FS_READONLY
02825 /*-----------------------------------------------------------------------*/
02826 /* Get Number of Free Clusters                                           */
02827 /*-----------------------------------------------------------------------*/
02828 
02829 FRESULT f_getfree (
02830     const TCHAR *path,    /* Pointer to the logical drive number (root dir) */
02831     DWORD *nclst,        /* Pointer to the variable to return number of free clusters */
02832     FATFS **fatfs        /* Pointer to pointer to corresponding file system object to return */
02833 )
02834 {
02835     FRESULT res;
02836     DWORD n, clst, sect, stat;
02837     UINT i;
02838     BYTE fat, *p;
02839 
02840 
02841     /* Get drive number */
02842     res = chk_mounted(&path, fatfs, 0);
02843     if (res == FR_OK) {
02844         /* If free_clust is valid, return it without full cluster scan */
02845         if ((*fatfs)->free_clust <= (*fatfs)->n_fatent - 2) {
02846             *nclst = (*fatfs)->free_clust;
02847         } else {
02848             /* Get number of free clusters */
02849             fat = (*fatfs)->fs_type;
02850             n = 0;
02851             if (fat == FS_FAT12) {
02852                 clst = 2;
02853                 do {
02854                     stat = get_fat(*fatfs, clst);
02855                     if (stat == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
02856                     if (stat == 1) { res = FR_INT_ERR; break; }
02857                     if (stat == 0) n++;
02858                 } while (++clst < (*fatfs)->n_fatent);
02859             } else {
02860                 clst = (*fatfs)->n_fatent;
02861                 sect = (*fatfs)->fatbase;
02862                 i = 0; p = 0;
02863                 do {
02864                     if (!i) {
02865                         res = move_window(*fatfs, sect++);
02866                         if (res != FR_OK) break;
02867                         p = (*fatfs)->win;
02868                         i = SS(*fatfs);
02869                     }
02870                     if (fat == FS_FAT16) {
02871                         if (LD_WORD(p) == 0) n++;
02872                         p += 2; i -= 2;
02873                     } else {
02874                         if ((LD_DWORD(p) & 0x0FFFFFFF) == 0) n++;
02875                         p += 4; i -= 4;
02876                     }
02877                 } while (--clst);
02878             }
02879             (*fatfs)->free_clust = n;
02880             if (fat == FS_FAT32) (*fatfs)->fsi_flag = 1;
02881             *nclst = n;
02882         }
02883     }
02884     LEAVE_FF(*fatfs, res);
02885 }
02886 
02887 
02888 
02889 
02890 /*-----------------------------------------------------------------------*/
02891 /* Truncate File                                                         */
02892 /*-----------------------------------------------------------------------*/
02893 
02894 FRESULT f_truncate (
02895     FIL *fp        /* Pointer to the file object */
02896 )
02897 {
02898     FRESULT res;
02899     DWORD ncl;
02900 
02901 
02902     res = validate(fp->fs, fp->id);        /* Check validity of the object */
02903     if (res == FR_OK) {
02904         if (fp->flag & FA__ERROR) {            /* Check abort flag */
02905             res = FR_INT_ERR;
02906         } else {
02907             if (!(fp->flag & FA_WRITE))        /* Check access mode */
02908                 res = FR_DENIED;
02909         }
02910     }
02911     if (res == FR_OK) {
02912         if (fp->fsize > fp->fptr) {
02913             fp->fsize = fp->fptr;    /* Set file size to current R/W point */
02914             fp->flag |= FA__WRITTEN;
02915             if (fp->fptr == 0) {    /* When set file size to zero, remove entire cluster chain */
02916                 res = remove_chain(fp->fs, fp->org_clust);
02917                 fp->org_clust = 0;
02918             } else {                /* When truncate a part of the file, remove remaining clusters */
02919                 ncl = get_fat(fp->fs, fp->curr_clust);
02920                 res = FR_OK;
02921                 if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
02922                 if (ncl == 1) res = FR_INT_ERR;
02923                 if (res == FR_OK && ncl < fp->fs->n_fatent) {
02924                     res = put_fat(fp->fs, fp->curr_clust, 0x0FFFFFFF);
02925                     if (res == FR_OK) res = remove_chain(fp->fs, ncl);
02926                 }
02927             }
02928         }
02929         if (res != FR_OK) fp->flag |= FA__ERROR;
02930     }
02931 
02932     LEAVE_FF(fp->fs, res);
02933 }
02934 
02935 
02936 
02937 
02938 /*-----------------------------------------------------------------------*/
02939 /* Delete a File or Directory                                            */
02940 /*-----------------------------------------------------------------------*/
02941 
02942 FRESULT f_unlink (
02943     const TCHAR *path        /* Pointer to the file or directory path */
02944 )
02945 {
02946     FRESULT res;
02947     DIR dj, sdj;
02948     BYTE *dir;
02949     DWORD dclst;
02950     DEF_NAMEBUF;
02951 
02952 
02953     res = chk_mounted(&path, &dj.fs, 1);
02954     if (res == FR_OK) {
02955         INIT_BUF(dj);
02956         res = follow_path(&dj, path);        /* Follow the file path */
02957         if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
02958             res = FR_INVALID_NAME;            /* Cannot remove dot entry */
02959 #if _FS_SHARE
02960         if (res == FR_OK) res = chk_lock(&dj, 2);    /* Cannot remove open file */
02961 #endif
02962         if (res == FR_OK) {                    /* The object is accessible */
02963             dir = dj.dir;
02964             if (!dir) {
02965                 res = FR_INVALID_NAME;        /* Cannot remove the start directory */
02966             } else {
02967                 if (dir[DIR_Attr] & AM_RDO)
02968                     res = FR_DENIED;        /* Cannot remove R/O object */
02969             }
02970             dclst = LD_CLUST(dir);
02971             if (res == FR_OK && (dir[DIR_Attr] & AM_DIR)) {    /* Is it a sub-dir? */
02972                 if (dclst < 2) {
02973                     res = FR_INT_ERR;
02974                 } else {
02975                     mem_cpy(&sdj, &dj, sizeof(DIR));    /* Check if the sub-dir is empty or not */
02976                     sdj.sclust = dclst;
02977                     res = dir_sdi(&sdj, 2);        /* Exclude dot entries */
02978                     if (res == FR_OK) {
02979                         res = dir_read(&sdj);
02980                         if (res == FR_OK            /* Not empty dir */
02981 #if _FS_RPATH
02982                         || dclst == sdj.fs->cdir    /* Current dir */
02983 #endif
02984                         ) res = FR_DENIED;
02985                         if (res == FR_NO_FILE) res = FR_OK;    /* Empty */
02986                     }
02987                 }
02988             }
02989             if (res == FR_OK) {
02990                 res = dir_remove(&dj);        /* Remove the directory entry */
02991                 if (res == FR_OK) {
02992                     if (dclst)                /* Remove the cluster chain if exist */
02993                         res = remove_chain(dj.fs, dclst);
02994                     if (res == FR_OK) res = sync(dj.fs);
02995                 }
02996             }
02997         }
02998         FREE_BUF();
02999     }
03000     LEAVE_FF(dj.fs, res);
03001 }
03002 
03003 
03004 
03005 
03006 /*-----------------------------------------------------------------------*/
03007 /* Create a Directory                                                    */
03008 /*-----------------------------------------------------------------------*/
03009 
03010 FRESULT f_mkdir (
03011     const TCHAR *path        /* Pointer to the directory path */
03012 )
03013 {
03014     FRESULT res;
03015     DIR dj;
03016     BYTE *dir, n;
03017     DWORD dsc, dcl, pcl, tim = get_fattime();
03018     DEF_NAMEBUF;
03019 
03020 
03021     res = chk_mounted(&path, &dj.fs, 1);
03022     if (res == FR_OK) {
03023         INIT_BUF(dj);
03024         res = follow_path(&dj, path);            /* Follow the file path */
03025         if (res == FR_OK) res = FR_EXIST;        /* Any object with same name is already existing */
03026         if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NS] & NS_DOT))
03027             res = FR_INVALID_NAME;
03028         if (res == FR_NO_FILE) {                /* Can create a new directory */
03029             dcl = create_chain(dj.fs, 0);        /* Allocate a cluster for the new directory table */
03030             res = FR_OK;
03031             if (dcl == 0) res = FR_DENIED;        /* No space to allocate a new cluster */
03032             if (dcl == 1) res = FR_INT_ERR;
03033             if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;
03034             if (res == FR_OK)                    /* Flush FAT */
03035                 res = move_window(dj.fs, 0);
03036             if (res == FR_OK) {                    /* Initialize the new directory table */
03037                 dsc = clust2sect(dj.fs, dcl);
03038                 dir = dj.fs->win;
03039                 mem_set(dir, 0, SS(dj.fs));
03040                 mem_set(dir+DIR_Name, ' ', 8+3);    /* Create "." entry */
03041                 dir[DIR_Name] = '.';
03042                 dir[DIR_Attr] = AM_DIR;
03043                 ST_DWORD(dir+DIR_WrtTime, tim);
03044                 ST_CLUST(dir, dcl);
03045                 mem_cpy(dir+32, dir, 32);             /* Create ".." entry */
03046                 dir[33] = '.'; pcl = dj.sclust;
03047                 if (dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase)
03048                     pcl = 0;
03049                 ST_CLUST(dir+32, pcl);
03050                 for (n = dj.fs->csize; n; n--) {    /* Write dot entries and clear following sectors */
03051                     dj.fs->winsect = dsc++;
03052                     dj.fs->wflag = 1;
03053                     res = move_window(dj.fs, 0);
03054                     if (res != FR_OK) break;
03055                     mem_set(dir, 0, SS(dj.fs));
03056                 }
03057             }
03058             if (res == FR_OK) res = dir_register(&dj);    /* Register the object to the directoy */
03059             if (res != FR_OK) {
03060                 remove_chain(dj.fs, dcl);            /* Could not register, remove cluster chain */
03061             } else {
03062                 dir = dj.dir;
03063                 dir[DIR_Attr] = AM_DIR;                /* Attribute */
03064                 ST_DWORD(dir+DIR_WrtTime, tim);        /* Created time */
03065                 ST_CLUST(dir, dcl);                    /* Table start cluster */
03066                 dj.fs->wflag = 1;
03067                 res = sync(dj.fs);
03068             }
03069         }
03070         FREE_BUF();
03071     }
03072 
03073     LEAVE_FF(dj.fs, res);
03074 }
03075 
03076 
03077 
03078 
03079 /*-----------------------------------------------------------------------*/
03080 /* Change Attribute                                                      */
03081 /*-----------------------------------------------------------------------*/
03082 
03083 FRESULT f_chmod (
03084     const TCHAR *path,    /* Pointer to the file path */
03085     BYTE value,            /* Attribute bits */
03086     BYTE mask            /* Attribute mask to change */
03087 )
03088 {
03089     FRESULT res;
03090     DIR dj;
03091     BYTE *dir;
03092     DEF_NAMEBUF;
03093 
03094 
03095     res = chk_mounted(&path, &dj.fs, 1);
03096     if (res == FR_OK) {
03097         INIT_BUF(dj);
03098         res = follow_path(&dj, path);        /* Follow the file path */
03099         FREE_BUF();
03100         if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
03101             res = FR_INVALID_NAME;
03102         if (res == FR_OK) {
03103             dir = dj.dir;
03104             if (!dir) {                        /* Is it a root directory? */
03105                 res = FR_INVALID_NAME;
03106             } else {                        /* File or sub directory */
03107                 mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;    /* Valid attribute mask */
03108                 dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask);    /* Apply attribute change */
03109                 dj.fs->wflag = 1;
03110                 res = sync(dj.fs);
03111             }
03112         }
03113     }
03114 
03115     LEAVE_FF(dj.fs, res);
03116 }
03117 
03118 
03119 
03120 
03121 /*-----------------------------------------------------------------------*/
03122 /* Change Timestamp                                                      */
03123 /*-----------------------------------------------------------------------*/
03124 
03125 FRESULT f_utime (
03126     const TCHAR *path,    /* Pointer to the file/directory name */
03127     const FILINFO *fno    /* Pointer to the time stamp to be set */
03128 )
03129 {
03130     FRESULT res;
03131     DIR dj;
03132     BYTE *dir;
03133     DEF_NAMEBUF;
03134 
03135 
03136     res = chk_mounted(&path, &dj.fs, 1);
03137     if (res == FR_OK) {
03138         INIT_BUF(dj);
03139         res = follow_path(&dj, path);    /* Follow the file path */
03140         FREE_BUF();
03141         if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
03142             res = FR_INVALID_NAME;
03143         if (res == FR_OK) {
03144             dir = dj.dir;
03145             if (!dir) {                    /* Root directory */
03146                 res = FR_INVALID_NAME;
03147             } else {                    /* File or sub-directory */
03148                 ST_WORD(dir+DIR_WrtTime, fno->ftime);
03149                 ST_WORD(dir+DIR_WrtDate, fno->fdate);
03150                 dj.fs->wflag = 1;
03151                 res = sync(dj.fs);
03152             }
03153         }
03154     }
03155 
03156     LEAVE_FF(dj.fs, res);
03157 }
03158 
03159 
03160 
03161 
03162 /*-----------------------------------------------------------------------*/
03163 /* Rename File/Directory                                                 */
03164 /*-----------------------------------------------------------------------*/
03165 
03166 FRESULT f_rename (
03167     const TCHAR *path_old,    /* Pointer to the old name */
03168     const TCHAR *path_new    /* Pointer to the new name */
03169 )
03170 {
03171     FRESULT res;
03172     DIR djo, djn;
03173     BYTE buf[21], *dir;
03174     DWORD dw;
03175     DEF_NAMEBUF;
03176 
03177 
03178     res = chk_mounted(&path_old, &djo.fs, 1);
03179     if (res == FR_OK) {
03180         djn.fs = djo.fs;
03181         INIT_BUF(djo);
03182         res = follow_path(&djo, path_old);        /* Check old object */
03183         if (_FS_RPATH && res == FR_OK && (djo.fn[NS] & NS_DOT))
03184             res = FR_INVALID_NAME;
03185 #if _FS_SHARE
03186         if (res == FR_OK) res = chk_lock(&djo, 2);
03187 #endif
03188         if (res == FR_OK) {                        /* Old object is found */
03189             if (!djo.dir) {                        /* Is root dir? */
03190                 res = FR_NO_FILE;
03191             } else {
03192                 mem_cpy(buf, djo.dir+DIR_Attr, 21);        /* Save the object information except for name */
03193                 mem_cpy(&djn, &djo, sizeof(DIR));        /* Check new object */
03194                 res = follow_path(&djn, path_new);
03195                 if (res == FR_OK) res = FR_EXIST;        /* The new object name is already existing */
03196                 if (res == FR_NO_FILE) {                 /* Is it a valid path and no name collision? */
03197 /* Start critical section that any interruption or error can cause cross-link */
03198                     res = dir_register(&djn);            /* Register the new entry */
03199                     if (res == FR_OK) {
03200                         dir = djn.dir;                    /* Copy object information except for name */
03201                         mem_cpy(dir+13, buf+2, 19);
03202                         dir[DIR_Attr] = buf[0] | AM_ARC;
03203                         djo.fs->wflag = 1;
03204                         if (djo.sclust != djn.sclust && (dir[DIR_Attr] & AM_DIR)) {        /* Update .. entry in the directory if needed */
03205                             dw = clust2sect(djn.fs, LD_CLUST(dir));
03206                             if (!dw) {
03207                                 res = FR_INT_ERR;
03208                             } else {
03209                                 res = move_window(djn.fs, dw);
03210                                 dir = djn.fs->win+32;    /* .. entry */
03211                                 if (res == FR_OK && dir[1] == '.') {
03212                                     dw = (djn.fs->fs_type == FS_FAT32 && djn.sclust == djn.fs->dirbase) ? 0 : djn.sclust;
03213                                     ST_CLUST(dir, dw);
03214                                     djn.fs->wflag = 1;
03215                                 }
03216                             }
03217                         }
03218                         if (res == FR_OK) {
03219                             res = dir_remove(&djo);        /* Remove old entry */
03220                             if (res == FR_OK)
03221                                 res = sync(djo.fs);
03222                         }
03223                     }
03224 /* End critical section */
03225                 }
03226             }
03227         }
03228         FREE_BUF();
03229     }
03230     LEAVE_FF(djo.fs, res);
03231 }
03232 
03233 #endif /* !_FS_READONLY */
03234 #endif /* _FS_MINIMIZE == 0 */
03235 #endif /* _FS_MINIMIZE <= 1 */
03236 #endif /* _FS_MINIMIZE <= 2 */
03237 
03238 
03239 
03240 /*-----------------------------------------------------------------------*/
03241 /* Forward data to the stream directly (available on only tiny cfg)      */
03242 /*-----------------------------------------------------------------------*/
03243 #if _USE_FORWARD && _FS_TINY
03244 
03245 FRESULT f_forward (
03246     FIL *fp,                         /* Pointer to the file object */
03247     UINT (*func)(const BYTE*,UINT),    /* Pointer to the streaming function */
03248     UINT btr,                        /* Number of bytes to forward */
03249     UINT *bf                        /* Pointer to number of bytes forwarded */
03250 )
03251 {
03252     FRESULT res;
03253     DWORD remain, clst, sect;
03254     UINT rcnt;
03255     BYTE csect;
03256 
03257 
03258     *bf = 0;    /* Initialize byte counter */
03259 
03260     res = validate(fp->fs, fp->id);                    /* Check validity of the object */
03261     if (res != FR_OK) LEAVE_FF(fp->fs, res);
03262     if (fp->flag & FA__ERROR)                        /* Check error flag */
03263         LEAVE_FF(fp->fs, FR_INT_ERR);
03264     if (!(fp->flag & FA_READ))                        /* Check access mode */
03265         LEAVE_FF(fp->fs, FR_DENIED);
03266 
03267     remain = fp->fsize - fp->fptr;
03268     if (btr > remain) btr = (UINT)remain;            /* Truncate btr by remaining bytes */
03269 
03270     for ( ;  btr && (*func)(0, 0);                    /* Repeat until all data transferred or stream becomes busy */
03271         fp->fptr += rcnt, *bf += rcnt, btr -= rcnt) {
03272         csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
03273         if ((fp->fptr % SS(fp->fs)) == 0) {            /* On the sector boundary? */
03274             if (!csect) {                            /* On the cluster boundary? */
03275                 clst = (fp->fptr == 0) ?            /* On the top of the file? */
03276                     fp->org_clust : get_fat(fp->fs, fp->curr_clust);
03277                 if (clst <= 1) ABORT(fp->fs, FR_INT_ERR);
03278                 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
03279                 fp->curr_clust = clst;                /* Update current cluster */
03280             }
03281         }
03282         sect = clust2sect(fp->fs, fp->curr_clust);    /* Get current data sector */
03283         if (!sect) ABORT(fp->fs, FR_INT_ERR);
03284         sect += csect;
03285         if (move_window(fp->fs, sect))                /* Move sector window */
03286             ABORT(fp->fs, FR_DISK_ERR);
03287         fp->dsect = sect;
03288         rcnt = SS(fp->fs) - (WORD)(fp->fptr % SS(fp->fs));    /* Forward data from sector window */
03289         if (rcnt > btr) rcnt = btr;
03290         rcnt = (*func)(&fp->fs->win[(WORD)fp->fptr % SS(fp->fs)], rcnt);
03291         if (!rcnt) ABORT(fp->fs, FR_INT_ERR);
03292     }
03293 
03294     LEAVE_FF(fp->fs, FR_OK);
03295 }
03296 #endif /* _USE_FORWARD */
03297 
03298 
03299 
03300 #if _USE_MKFS && !_FS_READONLY
03301 /*-----------------------------------------------------------------------*/
03302 /* Create File System on the Drive                                       */
03303 /*-----------------------------------------------------------------------*/
03304 #define N_ROOTDIR    512        /* Multiple of 32 */
03305 #define N_FATS        1        /* 1 or 2 */
03306 
03307 
03308 FRESULT f_mkfs (
03309     BYTE drv,        /* Logical drive number */
03310     BYTE sfd,        /* Partitioning rule 0:FDISK, 1:SFD */
03311     UINT au            /* Allocation unit size [bytes] */
03312 )
03313 {
03314     static const WORD vst[] = { 1024,   512,  256,  128,   64,    32,   16,    8,    4,    2,   0};
03315     static const WORD cst[] = {32768, 16384, 8192, 4096, 2048, 16384, 8192, 4096, 2048, 1024, 512};
03316     BYTE fmt, md, *tbl;
03317     DWORD n_clst, vs, n, wsect;
03318     UINT i;
03319     DWORD b_vol, b_fat, b_dir, b_data;    /* Offset (LBA) */
03320     DWORD n_vol, n_rsv, n_fat, n_dir;    /* Size */
03321     FATFS *fs;
03322     DSTATUS stat;
03323 
03324 
03325     /* Check mounted drive and clear work area */
03326     if (drv >= _VOLUMES) return FR_INVALID_DRIVE;
03327     fs = FatFs[drv];
03328     if (!fs) return FR_NOT_ENABLED;
03329     fs->fs_type = 0;
03330     drv = LD2PD(drv);
03331 
03332     /* Get disk statics */
03333     stat = disk_initialize(drv);
03334     if (stat & STA_NOINIT) return FR_NOT_READY;
03335     if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
03336 #if _MAX_SS != 512                    /* Get disk sector size */
03337     if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK)
03338         return FR_DISK_ERR;
03339 #endif
03340     if (disk_ioctl(drv, GET_SECTOR_COUNT, &n_vol) != RES_OK || n_vol < 128)
03341         return FR_DISK_ERR;
03342     b_vol = (sfd) ? 0 : 63;    /* Volume start sector */
03343     n_vol -= b_vol;
03344     if (au & (au - 1)) au = 0;        /* Check validity of the allocation unit size */
03345     if (!au) {                        /* AU auto selection */
03346         vs = n_vol / (2000 / (SS(fs) / 512));
03347         for (i = 0; vs < vst[i]; i++) ;
03348         au = cst[i];
03349     }
03350     au /= SS(fs);        /* Number of sectors per cluster */
03351     if (au == 0) au = 1;
03352     if (au > 128) au = 128;
03353 
03354     /* Pre-compute number of clusters and FAT syb-type */
03355     n_clst = n_vol / au;
03356     fmt = FS_FAT12;
03357     if (n_clst >= MIN_FAT16) fmt = FS_FAT16;
03358     if (n_clst >= MIN_FAT32) fmt = FS_FAT32;
03359 
03360     /* Determine offset and size of FAT structure */
03361     if (fmt == FS_FAT32) {
03362         n_fat = ((n_clst * 4) + 8 + SS(fs) - 1) / SS(fs);
03363         n_rsv = 32;
03364         n_dir = 0;
03365     } else {
03366         n_fat = (fmt == FS_FAT12) ? (n_clst * 3 + 1) / 2 + 3 : (n_clst * 2) + 4;
03367         n_fat = (n_fat + SS(fs) - 1) / SS(fs);
03368         n_rsv = 1;
03369         n_dir = N_ROOTDIR * 32UL / SS(fs);
03370     }
03371     b_fat = b_vol + n_rsv;                /* FAT area start sector */
03372     b_dir = b_fat + n_fat * N_FATS;        /* Directory area start sector */
03373     b_data = b_dir + n_dir;                /* Data area start sector */
03374     if (n_vol < b_data + au) return FR_MKFS_ABORTED;    /* Too small volume */
03375 
03376     /* Align data start sector to erase block boundary (for flash memory media) */
03377     if (disk_ioctl(drv, GET_BLOCK_SIZE, &n) != RES_OK || !n || n > 32768) n = 1;
03378     n = (b_data + n - 1) & ~(n - 1);    /* Next nearest erase block from current data start */
03379     n = (n - b_data) / N_FATS;
03380     if (fmt == FS_FAT32) {        /* FAT32: Move FAT offset */
03381         n_rsv += n;
03382         b_fat += n;
03383     } else {                    /* FAT12/16: Expand FAT size */
03384         n_fat += n;
03385     }
03386 
03387     /* Determine number of cluster and final check of validity of the FAT sub-type */
03388     n_clst = (n_vol - n_rsv - n_fat * N_FATS - n_dir) / au;
03389     if (   (fmt == FS_FAT16 && n_clst < MIN_FAT16)
03390         || (fmt == FS_FAT32 && n_clst < MIN_FAT32))
03391         return FR_MKFS_ABORTED;
03392 
03393     /* Create partition table if required */
03394     if (sfd) {
03395         md = 0xF0;
03396     } else {
03397         DWORD n_disk = b_vol + n_vol;
03398 
03399         mem_set(fs->win, 0, SS(fs));
03400         tbl = fs->win+MBR_Table;
03401         ST_DWORD(tbl, 0x00010180);            /* Partition start in CHS */
03402         if (n_disk < 63UL * 255 * 1024) {    /* Partition end in CHS */
03403             n_disk = n_disk / 63 / 255;
03404             tbl[7] = (BYTE)n_disk;
03405             tbl[6] = (BYTE)((n_disk >> 2) | 63);
03406         } else {
03407             ST_WORD(&tbl[6], 0xFFFF);
03408         }
03409         tbl[5] = 254;
03410         if (fmt != FS_FAT32)                /* System ID */
03411             tbl[4] = (n_vol < 0x10000) ? 0x04 : 0x06;
03412         else
03413             tbl[4] = 0x0c;
03414         ST_DWORD(tbl+8, 63);                /* Partition start in LBA */
03415         ST_DWORD(tbl+12, n_vol);            /* Partition size in LBA */
03416         ST_WORD(tbl+64, 0xAA55);            /* Signature */
03417         if (disk_write(drv, fs->win, 0, 1) != RES_OK)
03418             return FR_DISK_ERR;
03419         md = 0xF8;
03420     }
03421 
03422     /* Create volume boot record */
03423     tbl = fs->win;                            /* Clear sector */
03424     mem_set(tbl, 0, SS(fs));
03425     mem_cpy(tbl, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot code, OEM name */
03426     i = SS(fs);                                /* Sector size */
03427     ST_WORD(tbl+BPB_BytsPerSec, i);
03428     tbl[BPB_SecPerClus] = (BYTE)au;            /* Sectors per cluster */
03429     ST_WORD(tbl+BPB_RsvdSecCnt, n_rsv);        /* Reserved sectors */
03430     tbl[BPB_NumFATs] = N_FATS;                /* Number of FATs */
03431     i = (fmt == FS_FAT32) ? 0 : N_ROOTDIR;    /* Number of rootdir entries */
03432     ST_WORD(tbl+BPB_RootEntCnt, i);
03433     if (n_vol < 0x10000) {                    /* Number of total sectors */
03434         ST_WORD(tbl+BPB_TotSec16, n_vol);
03435     } else {
03436         ST_DWORD(tbl+BPB_TotSec32, n_vol);
03437     }
03438     tbl[BPB_Media] = md;                    /* Media descriptor */
03439     ST_WORD(tbl+BPB_SecPerTrk, 63);            /* Number of sectors per track */
03440     ST_WORD(tbl+BPB_NumHeads, 255);            /* Number of heads */
03441     ST_DWORD(tbl+BPB_HiddSec, b_vol);        /* Hidden sectors */
03442     n = get_fattime();                        /* Use current time as VSN */
03443     if (fmt == FS_FAT32) {
03444         ST_DWORD(tbl+BS_VolID32, n);        /* VSN */
03445         ST_DWORD(tbl+BPB_FATSz32, n_fat);    /* Number of sectors per FAT */
03446         ST_DWORD(tbl+BPB_RootClus, 2);        /* Root directory start cluster (2) */
03447         ST_WORD(tbl+BPB_FSInfo, 1);            /* FSInfo record offset (VBR+1) */
03448         ST_WORD(tbl+BPB_BkBootSec, 6);        /* Backup boot record offset (VBR+6) */
03449         tbl[BS_DrvNum32] = 0x80;            /* Drive number */
03450         tbl[BS_BootSig32] = 0x29;            /* Extended boot signature */
03451         mem_cpy(tbl+BS_VolLab32, "NO NAME    " "FAT32   ", 19);    /* Volume label, FAT signature */
03452     } else {
03453         ST_DWORD(tbl+BS_VolID, n);            /* VSN */
03454         ST_WORD(tbl+BPB_FATSz16, n_fat);    /* Number of sectors per FAT */
03455         tbl[BS_DrvNum] = 0x80;                /* Drive number */
03456         tbl[BS_BootSig] = 0x29;                /* Extended boot signature */
03457         mem_cpy(tbl+BS_VolLab, "NO NAME    " "FAT     ", 19);    /* Volume label, FAT signature */
03458     }
03459     ST_WORD(tbl+BS_55AA, 0xAA55);            /* Signature (Offset is fixed here regardless of sector size) */
03460     if (disk_write(drv, tbl, b_vol, 1) != RES_OK)/* Write original (VBR) */
03461         return FR_DISK_ERR;
03462     if (fmt == FS_FAT32)                    /* Write backup (VBR+6) */
03463         disk_write(drv, tbl, b_vol + 6, 1);
03464 
03465     /* Initialize FAT area */
03466     wsect = b_fat;
03467     for (i = 0; i < N_FATS; i++) {
03468         mem_set(tbl, 0, SS(fs));            /* 1st sector of the FAT  */
03469         n = md;                                /* Media descriptor byte */
03470         if (fmt != FS_FAT32) {
03471             n |= (fmt == FS_FAT12) ? 0x00FFFF00 : 0xFFFFFF00;
03472             ST_DWORD(tbl+0, n);                /* Reserve cluster #0-1 (FAT12/16) */
03473         } else {
03474             n |= 0xFFFFFF00;
03475             ST_DWORD(tbl+0, n);                /* Reserve cluster #0-1 (FAT32) */
03476             ST_DWORD(tbl+4, 0xFFFFFFFF);
03477             ST_DWORD(tbl+8, 0x0FFFFFFF);    /* Reserve cluster #2 for root dir */
03478         }
03479         if (disk_write(drv, tbl, wsect++, 1) != RES_OK)
03480             return FR_DISK_ERR;
03481         mem_set(tbl, 0, SS(fs));            /* Fill following FAT entries with zero */
03482         for (n = 1; n < n_fat; n++) {        /* This loop may take a time on FAT32 volume due to many single sector write */
03483             if (disk_write(drv, tbl, wsect++, 1) != RES_OK)
03484                 return FR_DISK_ERR;
03485         }
03486     }
03487 
03488     /* Initialize root directory */
03489     i = (fmt == FS_FAT32) ? au : n_dir;
03490     do {
03491         if (disk_write(drv, tbl, wsect++, 1) != RES_OK)
03492             return FR_DISK_ERR;
03493     } while (--i);
03494 
03495 #if _USE_ERASE    /* Erase data area if needed */
03496     {
03497         DWORD eb[2];
03498 
03499         eb[0] = wsect; eb[1] = wsect + n_clst * au - 1;
03500         disk_ioctl(drv, CTRL_ERASE_SECTOR, eb);
03501     }
03502 #endif
03503 
03504     /* Create FSInfo if needed */
03505     if (fmt == FS_FAT32) {
03506         ST_WORD(tbl+BS_55AA, 0xAA55);
03507         ST_DWORD(tbl+FSI_LeadSig, 0x41615252);
03508         ST_DWORD(tbl+FSI_StrucSig, 0x61417272);
03509         ST_DWORD(tbl+FSI_Free_Count, n_clst - 1);
03510         ST_DWORD(tbl+FSI_Nxt_Free, 0xFFFFFFFF);
03511         disk_write(drv, tbl, b_vol + 1, 1);    /* Write original (VBR+1) */
03512         disk_write(drv, tbl, b_vol + 7, 1);    /* Write backup (VBR+7) */
03513     }
03514 
03515     return (disk_ioctl(drv, CTRL_SYNC, (void*)0) == RES_OK) ? FR_OK : FR_DISK_ERR;
03516 }
03517 
03518 #endif /* _USE_MKFS && !_FS_READONLY */
03519 
03520 
03521 
03522 
03523 #if _USE_STRFUNC
03524 /*-----------------------------------------------------------------------*/
03525 /* Get a string from the file                                            */
03526 /*-----------------------------------------------------------------------*/
03527 TCHAR* f_gets (
03528     TCHAR* buff,    /* Pointer to the string buffer to read */
03529     int len,        /* Size of string buffer (characters) */
03530     FIL* fil        /* Pointer to the file object */
03531 )
03532 {
03533     int n = 0;
03534     TCHAR c, *p = buff;
03535     BYTE s[2];
03536     UINT rc;
03537 
03538 
03539     while (n < len - 1) {            /* Read bytes until buffer gets filled */
03540         f_read(fil, s, 1, &rc);
03541         if (rc != 1) break;            /* Break on EOF or error */
03542         c = s[0];
03543 #if _LFN_UNICODE                    /* Read a character in UTF-8 encoding */
03544         if (c >= 0x80) {
03545             if (c < 0xC0) continue;    /* Skip stray trailer */
03546             if (c < 0xE0) {            /* Two-byte sequense */
03547                 f_read(fil, s, 1, &rc);
03548                 if (rc != 1) break;
03549                 c = ((c & 0x1F) << 6) | (s[0] & 0x3F);
03550                 if (c < 0x80) c = '?';
03551             } else {
03552                 if (c < 0xF0) {        /* Three-byte sequense */
03553                     f_read(fil, s, 2, &rc);
03554                     if (rc != 2) break;
03555                     c = (c << 12) | ((s[0] & 0x3F) << 6) | (s[1] & 0x3F);
03556                     if (c < 0x800) c = '?';
03557                 } else {            /* Reject four-byte sequense */
03558                     c = '?';
03559                 }
03560             }
03561         }
03562 #endif
03563 #if _USE_STRFUNC >= 2
03564         if (c == '\r') continue;    /* Strip '\r' */
03565 #endif
03566         *p++ = c;
03567         n++;
03568         if (c == '\n') break;        /* Break on EOL */
03569     }
03570     *p = 0;
03571     return n ? buff : 0;            /* When no data read (eof or error), return with error. */
03572 }
03573 
03574 
03575 
03576 #if !_FS_READONLY
03577 #include <stdarg.h>
03578 /*-----------------------------------------------------------------------*/
03579 /* Put a character to the file                                           */
03580 /*-----------------------------------------------------------------------*/
03581 int f_putc (
03582     TCHAR c,    /* A character to be output */
03583     FIL* fil    /* Pointer to the file object */
03584 )
03585 {
03586     UINT bw, btw;
03587     BYTE s[3];
03588 
03589 
03590 #if _USE_STRFUNC >= 2
03591     if (c == '\n') f_putc ('\r', fil);    /* LF -> CRLF conversion */
03592 #endif
03593 
03594 #if _LFN_UNICODE    /* Write the character in UTF-8 encoding */
03595     if (c < 0x80) {            /* 7-bit */
03596         s[0] = (BYTE)c;
03597         btw = 1;
03598     } else {
03599         if (c < 0x800) {    /* 11-bit */
03600             s[0] = (BYTE)(0xC0 | (c >> 6));
03601             s[1] = (BYTE)(0x80 | (c & 0x3F));
03602             btw = 2;
03603         } else {            /* 16-bit */
03604             s[0] = (BYTE)(0xE0 | (c >> 12));
03605             s[1] = (BYTE)(0x80 | ((c >> 6) & 0x3F));
03606             s[2] = (BYTE)(0x80 | (c & 0x3F));
03607             btw = 3;
03608         }
03609     }
03610 #else                /* Write the character without conversion */
03611     s[0] = (BYTE)c;
03612     btw = 1;
03613 #endif
03614     f_write(fil, s, btw, &bw);        /* Write the char to the file */
03615     return (bw == btw) ? 1 : EOF;    /* Return the result */
03616 }
03617 
03618 
03619 
03620 
03621 /*-----------------------------------------------------------------------*/
03622 /* Put a string to the file                                              */
03623 /*-----------------------------------------------------------------------*/
03624 int f_puts (
03625     const TCHAR* str,    /* Pointer to the string to be output */
03626     FIL* fil            /* Pointer to the file object */
03627 )
03628 {
03629     int n;
03630 
03631 
03632     for (n = 0; *str; str++, n++) {
03633         if (f_putc(*str, fil) == EOF) return EOF;
03634     }
03635     return n;
03636 }
03637 
03638 
03639 
03640 
03641 /*-----------------------------------------------------------------------*/
03642 /* Put a formatted string to the file                                    */
03643 /*-----------------------------------------------------------------------*/
03644 int f_printf (
03645     FIL* fil,            /* Pointer to the file object */
03646     const TCHAR* str,    /* Pointer to the format string */
03647     ...                    /* Optional arguments... */
03648 )
03649 {
03650     va_list arp;
03651     BYTE f, r;
03652     UINT i, w;
03653     ULONG val;
03654     TCHAR c, d, s[16];
03655     int res, cc;
03656 
03657 
03658     va_start(arp, str);
03659 
03660     for (cc = res = 0; cc != EOF; res += cc) {
03661         c = *str++;
03662         if (c == 0) break;            /* End of string */
03663         if (c != '%') {                /* Non escape character */
03664             cc = f_putc(c, fil);
03665             if (cc != EOF) cc = 1;
03666             continue;
03667         }
03668         w = f = 0;
03669         c = *str++;
03670         if (c == '0') {                /* Flag: '0' padding */
03671             f = 1; c = *str++;
03672         }
03673         while (IsDigit(c)) {        /* Precision */
03674             w = w * 10 + c - '0';
03675             c = *str++;
03676         }
03677         if (c == 'l' || c == 'L') {    /* Prefix: Size is long int */
03678             f |= 2; c = *str++;
03679         }
03680         if (!c) break;
03681         d = c;
03682         if (IsLower(d)) d -= 0x20;
03683         switch (d) {                /* Type is... */
03684         case 'S' :                    /* String */
03685             cc = f_puts(va_arg(arp, TCHAR*), fil); continue;
03686         case 'C' :                    /* Character */
03687             cc = f_putc((TCHAR)va_arg(arp, int), fil); continue;
03688         case 'B' :                    /* Binary */
03689             r = 2; break;
03690         case 'O' :                    /* Octal */
03691             r = 8; break;
03692         case 'D' :                    /* Signed decimal */
03693         case 'U' :                    /* Unsigned decimal */
03694             r = 10; break;
03695         case 'X' :                    /* Hexdecimal */
03696             r = 16; break;
03697         default:                    /* Unknown */
03698             cc = f_putc(c, fil); continue;
03699         }
03700 
03701         /* Get an argument */
03702         val = (f & 2) ? va_arg(arp, long) : ((d == 'D') ? (long)va_arg(arp, int) : va_arg(arp, unsigned int));
03703         if (d == 'D' && (val & 0x80000000)) {
03704             val = 0 - val;
03705             f |= 4;
03706         }
03707         /* Put it in numeral string */
03708         i = 0;
03709         do {
03710             d = (TCHAR)(val % r); val /= r;
03711             if (d > 9) {
03712                 d += 7;
03713                 if (c == 'x') d += 0x20;
03714             }
03715             s[i++] = d + '0';
03716         } while (val && i < sizeof(s) / sizeof(s[0]));
03717         if (f & 4) s[i++] = '-';
03718         cc = 0;
03719         while (i < w-- && cc != EOF) {
03720             cc = f_putc((TCHAR)((f & 1) ? '0' : ' '), fil);
03721             res++;
03722         }
03723         do {
03724             cc = f_putc(s[--i], fil); 
03725             res++;
03726         } while (i && cc != EOF);
03727         if (cc != EOF) cc = 0;
03728     }
03729 
03730     va_end(arp);
03731     return (cc == EOF) ? cc : res;
03732 }
03733 
03734 #endif /* !_FS_READONLY */
03735 #endif /* _USE_STRFUNC */