Andy K
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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 */
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