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Added boot process information to help someone find out what really happens.
[bootos.git] / stage2 / ff.c
blob7bbedbadf0680b1480a8c5a44ff1aa1c13396052
1 /*----------------------------------------------------------------------------/
2 / FatFs - FAT file system module R0.07a (C)ChaN, 2009
3 /-----------------------------------------------------------------------------/
4 / FatFs module is an open source software to implement FAT file system to
5 / small embedded systems. This is a free software and is opened for education,
6 / research and commercial developments under license policy of following trems.
7 /
8 / Copyright (C) 2009, ChaN, all right reserved.
9 /
10 / * The FatFs module is a free software and there is NO WARRANTY.
11 / * No restriction on use. You can use, modify and redistribute it for
12 / personal, non-profit or commercial use UNDER YOUR RESPONSIBILITY.
13 / * Redistributions of source code must retain the above copyright notice.
14 //-----------------------------------------------------------------------------/
15 / Feb 26,'06 R0.00 Prototype.
16 /
17 / Apr 29,'06 R0.01 First stable version.
18 /
19 / Jun 01,'06 R0.02 Added FAT12 support.
20 / Removed unbuffered mode.
21 / Fixed a problem on small (<32M) patition.
22 / Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
23 /
24 / Sep 22,'06 R0.03 Added f_rename().
25 / Changed option _FS_MINIMUM to _FS_MINIMIZE.
26 / Dec 11,'06 R0.03a Improved cluster scan algolithm to write files fast.
27 / Fixed f_mkdir() creates incorrect directory on FAT32.
28 /
29 / Feb 04,'07 R0.04 Supported multiple drive system.
30 / Changed some interfaces for multiple drive system.
31 / Changed f_mountdrv() to f_mount().
32 / Added f_mkfs().
33 / Apr 01,'07 R0.04a Supported multiple partitions on a plysical drive.
34 / Added a capability of extending file size to f_lseek().
35 / Added minimization level 3.
36 / Fixed an endian sensitive code in f_mkfs().
37 / May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
38 / Added FSInfo support.
39 / Fixed DBCS name can result FR_INVALID_NAME.
40 / Fixed short seek (<= csize) collapses the file object.
41 /
42 / Aug 25,'07 R0.05 Changed arguments of f_read(), f_write() and f_mkfs().
43 / Fixed f_mkfs() on FAT32 creates incorrect FSInfo.
44 / Fixed f_mkdir() on FAT32 creates incorrect directory.
45 / Feb 03,'08 R0.05a Added f_truncate() and f_utime().
46 / Fixed off by one error at FAT sub-type determination.
47 / Fixed btr in f_read() can be mistruncated.
48 / Fixed cached sector is not flushed when create and close
49 / without write.
50 /
51 / Apr 01,'08 R0.06 Added fputc(), fputs(), fprintf() and fgets().
52 / Improved performance of f_lseek() on moving to the same
53 / or following cluster.
54 /
55 / Apr 01,'09 R0.07 Merged Tiny-FatFs as a buffer configuration option.
56 / Added long file name support.
57 / Added multiple code page support.
58 / Added re-entrancy for multitask operation.
59 / Added auto cluster size selection to f_mkfs().
60 / Added rewind option to f_readdir().
61 / Changed result code of critical errors.
62 / Renamed string functions to avoid name collision.
63 / Apr 14,'09 R0.07a Separated out OS dependent code on reentrant cfg.
64 / Added multiple sector size support.
65 /---------------------------------------------------------------------------*/
66
67 #include "ff.h" /* FatFs configurations and declarations */
68 #include "diskio.h" /* Declarations of low level disk I/O functions */
69
70
71 /*--------------------------------------------------------------------------
72
73 Module Private Definitions
74
75 ---------------------------------------------------------------------------*/
76
77 #if _FS_REENTRANT
78 #if _USE_LFN == 1
79 #error Static LFN work area must not be used in re-entrant configuration.
80 #endif
81 #define ENTER_FF(fs) { if (!lock_fs(fs)) return FR_TIMEOUT; }
82 #define LEAVE_FF(fs, res) { unlock_fs(fs, res); return res; }
83
84 #else
85 #define ENTER_FF(fs)
86 #define LEAVE_FF(fs, res) return res
87
88 #endif
89
90 #define ABORT(fs, res) { fp->flag |= FA__ERROR; LEAVE_FF(fs, res); }
91
92 #ifndef NULL
93 #define NULL 0
94 #endif
95
96
97 /*--------------------------------------------------------------------------
98
99 Private Work Area
100
101 ---------------------------------------------------------------------------*/
102
103 static
104 FATFS *FatFs[_DRIVES]; /* Pointer to the file system objects (logical drives) */
105 static
106 WORD Fsid; /* File system mount ID */
107
108
109 #if _USE_LFN == 1 /* LFN with static LFN working buffer */
110 static
111 WORD LfnBuf[_MAX_LFN + 1];
112 #define NAMEBUF(sp,lp) BYTE sp[12]; WCHAR *lp = LfnBuf
113 #define INITBUF(dj,sp,lp) dj.fn = sp; dj.lfn = lp
114
115 #elif _USE_LFN > 1 /* LFN with dynamic LFN working buffer */
116 #define NAMEBUF(sp,lp) BYTE sp[12]; WCHAR lbuf[_MAX_LFN + 1], *lp = lbuf
117 #define INITBUF(dj,sp,lp) dj.fn = sp; dj.lfn = lp
118
119 #else /* No LFN */
120 #define NAMEBUF(sp,lp) BYTE sp[12]
121 #define INITBUF(dj,sp,lp) dj.fn = sp
122
123 #endif
124
125
126
127
128 /*--------------------------------------------------------------------------
129
130 Private Functions
131
132 ---------------------------------------------------------------------------*/
133
134
135 /*-----------------------------------------------------------------------*/
136 /* String functions */
137 /*-----------------------------------------------------------------------*/
138
139 /* Copy memory to memory */
140 static
141 void mem_cpy (void* dst, const void* src, int cnt) {
142 char *d = (char*)dst;
143 const char *s = (const char *)src;
144 while (cnt--) *d++ = *s++;
145 }
146
147 /* Fill memory */
148 static
149 void mem_set (void* dst, int val, int cnt) {
150 char *d = (char*)dst;
151 while (cnt--) *d++ = (char)val;
152 }
153
154 /* Compare memory to memory */
155 static
156 int mem_cmp (const void* dst, const void* src, int cnt) {
157 const char *d = (const char *)dst, *s = (const char *)src;
158 int r = 0;
159 while (cnt-- && (r = *d++ - *s++) == 0) ;
160 return r;
161 }
162
163 /* Check if chr is contained in the string */
164 static
165 int chk_chr (const char* str, int chr) {
166 while (*str && *str != chr) str++;
167 return *str;
168 }
169
170
171
172 /*-----------------------------------------------------------------------*/
173 /* Request/Release grant to access the volume */
174 /*-----------------------------------------------------------------------*/
175 #if _FS_REENTRANT
176
177 static
178 BOOL lock_fs (
179 FATFS *fs /* File system object */
180 )
181 {
182 return ff_req_grant(fs->sobj);
183 }
184
185
186 static
187 void unlock_fs (
188 FATFS *fs, /* File system object */
189 FRESULT res /* Result code to be returned */
190 )
191 {
192 if (res != FR_NOT_ENABLED &&
193 res != FR_INVALID_DRIVE &&
194 res != FR_INVALID_OBJECT &&
195 res != FR_TIMEOUT) {
196 ff_rel_grant(fs->sobj);
197 }
198 }
199 #endif
200
201
202
203 /*-----------------------------------------------------------------------*/
204 /* Change window offset */
205 /*-----------------------------------------------------------------------*/
206
207 static
208 FRESULT move_window (
209 FATFS *fs, /* File system object */
210 DWORD sector /* Sector number to make apperance in the fs->win[] */
211 ) /* Move to zero only writes back dirty window */
212 {
213 DWORD wsect;
214
215
216 wsect = fs->winsect;
217 if (wsect != sector) { /* Changed current window */
218 #if !_FS_READONLY
219 if (fs->wflag) { /* Write back dirty window if needed */
220 if (disk_write(fs->drive, fs->win, wsect, 1) != RES_OK)
221 return FR_DISK_ERR;
222 fs->wflag = 0;
223 if (wsect < (fs->fatbase + fs->sects_fat)) { /* In FAT area */
224 BYTE nf;
225 for (nf = fs->n_fats; nf >= 2; nf--) { /* Refrect the change to FAT copy */
226 wsect += fs->sects_fat;
227 disk_write(fs->drive, fs->win, wsect, 1);
228 }
229 }
230 }
231 #endif
232 if (sector) {
233 if (disk_read(fs->drive, fs->win, sector, 1) != RES_OK)
234 return FR_DISK_ERR;
235 fs->winsect = sector;
236 }
237 }
238
239 return FR_OK;
240 }
241
242
243
244
245 /*-----------------------------------------------------------------------*/
246 /* Clean-up cached data */
247 /*-----------------------------------------------------------------------*/
248 #if !_FS_READONLY
249 static
250 FRESULT sync ( /* FR_OK: successful, FR_DISK_ERR: failed */
251 FATFS *fs /* File system object */
252 )
253 {
254 FRESULT res;
255
256
257 res = move_window(fs, 0);
258 if (res == FR_OK) {
259 /* Update FSInfo sector if needed */
260 if (fs->fs_type == FS_FAT32 && fs->fsi_flag) {
261 fs->winsect = 0;
262 mem_set(fs->win, 0, 512);
263 ST_WORD(fs->win+BS_55AA, 0xAA55);
264 ST_DWORD(fs->win+FSI_LeadSig, 0x41615252);
265 ST_DWORD(fs->win+FSI_StrucSig, 0x61417272);
266 ST_DWORD(fs->win+FSI_Free_Count, fs->free_clust);
267 ST_DWORD(fs->win+FSI_Nxt_Free, fs->last_clust);
268 disk_write(fs->drive, fs->win, fs->fsi_sector, 1);
269 fs->fsi_flag = 0;
270 }
271 /* Make sure that no pending write process in the physical drive */
272 if (disk_ioctl(fs->drive, CTRL_SYNC, (void*)NULL) != RES_OK)
273 res = FR_DISK_ERR;
274 }
275
276 return res;
277 }
278 #endif
279
280
281
282
283 /*-----------------------------------------------------------------------*/
284 /* Get a cluster status */
285 /*-----------------------------------------------------------------------*/
286
287 static
288 DWORD get_cluster ( /* 0xFFFFFFFF:Disk error, 1:Interal error, Else:Cluster status */
289 FATFS *fs, /* File system object */
290 DWORD clst /* Cluster# to get the link information */
291 )
292 {
293 WORD wc, bc;
294 DWORD fsect;
295
296
297 if (clst < 2 || clst >= fs->max_clust) /* Check cluster address range */
298 return 1;
299
300 fsect = fs->fatbase;
301 switch (fs->fs_type) {
302 case FS_FAT12 :
303 bc = (WORD)clst * 3 / 2;
304 if (move_window(fs, fsect + (bc / SS(fs)))) break;
305 wc = fs->win[bc & (SS(fs) - 1)]; bc++;
306 if (move_window(fs, fsect + (bc / SS(fs)))) break;
307 wc |= (WORD)fs->win[bc & (SS(fs) - 1)] << 8;
308 return (clst & 1) ? (wc >> 4) : (wc & 0xFFF);
309
310 case FS_FAT16 :
311 if (move_window(fs, fsect + (clst / (SS(fs) / 2)))) break;
312 return LD_WORD(&fs->win[((WORD)clst * 2) & (SS(fs) - 1)]);
313
314 case FS_FAT32 :
315 if (move_window(fs, fsect + (clst / (SS(fs) / 4)))) break;
316 return LD_DWORD(&fs->win[((WORD)clst * 4) & (SS(fs) - 1)]) & 0x0FFFFFFF;
317 }
318
319 return 0xFFFFFFFF; /* An error occured at the disk I/O layer */
320 }
321
322
323
324
325 /*-----------------------------------------------------------------------*/
326 /* Change a cluster status */
327 /*-----------------------------------------------------------------------*/
328 #if !_FS_READONLY
329 static
330 FRESULT put_cluster (
331 FATFS *fs, /* File system object */
332 DWORD clst, /* Cluster# to be changed (must be 2 to fs->max_clust-1) */
333 DWORD val /* New value to mark the cluster */
334 )
335 {
336 WORD bc;
337 BYTE *p;
338 DWORD fsect;
339 FRESULT res;
340
341
342 if (clst < 2 || clst >= fs->max_clust) { /* Check cluster address range */
343 res = FR_INT_ERR;
344
345 } else {
346 fsect = fs->fatbase;
347 switch (fs->fs_type) {
348 case FS_FAT12 :
349 bc = (WORD)clst * 3 / 2;
350 res = move_window(fs, fsect + (bc / SS(fs)));
351 if (res != FR_OK) break;
352 p = &fs->win[bc & (SS(fs) - 1)];
353 *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
354 bc++;
355 fs->wflag = 1;
356 res = move_window(fs, fsect + (bc / SS(fs)));
357 if (res != FR_OK) break;
358 p = &fs->win[bc & (SS(fs) - 1)];
359 *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
360 break;
361
362 case FS_FAT16 :
363 res = move_window(fs, fsect + (clst / (SS(fs) / 2)));
364 if (res != FR_OK) break;
365 ST_WORD(&fs->win[((WORD)clst * 2) & (SS(fs) - 1)], (WORD)val);
366 break;
367
368 case FS_FAT32 :
369 res = move_window(fs, fsect + (clst / (SS(fs) / 4)));
370 if (res != FR_OK) break;
371 ST_DWORD(&fs->win[((WORD)clst * 4) & (SS(fs) - 1)], val);
372 break;
373
374 default :
375 res = FR_INT_ERR;
376 }
377 fs->wflag = 1;
378 }
379
380 return res;
381 }
382 #endif /* !_FS_READONLY */
383
384
385
386
387 /*-----------------------------------------------------------------------*/
388 /* Remove a cluster chain */
389 /*-----------------------------------------------------------------------*/
390 #if !_FS_READONLY
391 static
392 FRESULT remove_chain (
393 FATFS *fs, /* File system object */
394 DWORD clst /* Cluster# to remove chain from */
395 )
396 {
397 FRESULT res;
398 DWORD nxt;
399
400
401 if (clst < 2 || clst >= fs->max_clust) { /* Check cluster address range */
402 res = FR_INT_ERR;
403
404 } else {
405 res = FR_OK;
406 while (clst < fs->max_clust) { /* Not a last link? */
407 nxt = get_cluster(fs, clst); /* Get cluster status */
408 if (nxt == 0) break; /* Empty cluster? */
409 if (nxt == 1) { res = FR_INT_ERR; break; } /* Internal error? */
410 if (nxt == 0xFFFFFFFF) { res = FR_DISK_ERR; break; } /* Disk error? */
411 res = put_cluster(fs, clst, 0); /* Mark the cluster "empty" */
412 if (res != FR_OK) break;
413 if (fs->free_clust != 0xFFFFFFFF) { /* Update FSInfo */
414 fs->free_clust++;
415 fs->fsi_flag = 1;
416 }
417 clst = nxt; /* Next cluster */
418 }
419 }
420
421 return res;
422 }
423 #endif
424
425
426
427
428 /*-----------------------------------------------------------------------*/
429 /* Stretch or create a cluster chain */
430 /*-----------------------------------------------------------------------*/
431 #if !_FS_READONLY
432 static
433 DWORD create_chain ( /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
434 FATFS *fs, /* File system object */
435 DWORD clst /* Cluster# to stretch. 0 means create a new chain. */
436 )
437 {
438 DWORD cs, ncl, scl, mcl;
439
440
441 mcl = fs->max_clust;
442 if (clst == 0) { /* Create new chain */
443 scl = fs->last_clust; /* Get suggested start point */
444 if (scl == 0 || scl >= mcl) scl = 1;
445 }
446 else { /* Stretch existing chain */
447 cs = get_cluster(fs, clst); /* Check the cluster status */
448 if (cs < 2) return 1; /* It is an invalid cluster */
449 if (cs < mcl) return cs; /* It is already followed by next cluster */
450 scl = clst;
451 }
452
453 ncl = scl; /* Start cluster */
454 for (;;) {
455 ncl++; /* Next cluster */
456 if (ncl >= mcl) { /* Wrap around */
457 ncl = 2;
458 if (ncl > scl) return 0; /* No free custer */
459 }
460 cs = get_cluster(fs, ncl); /* Get the cluster status */
461 if (cs == 0) break; /* Found a free cluster */
462 if (cs == 0xFFFFFFFF || cs == 1)/* An error occured */
463 return cs;
464 if (ncl == scl) return 0; /* No free custer */
465 }
466
467 if (put_cluster(fs, ncl, 0x0FFFFFFF)) /* Mark the new cluster "in use" */
468 return 0xFFFFFFFF;
469 if (clst != 0) { /* Link it to previous one if needed */
470 if (put_cluster(fs, clst, ncl))
471 return 0xFFFFFFFF;
472 }
473
474 fs->last_clust = ncl; /* Update FSINFO */
475 if (fs->free_clust != 0xFFFFFFFF) {
476 fs->free_clust--;
477 fs->fsi_flag = 1;
478 }
479
480 return ncl; /* Return new cluster number */
481 }
482 #endif /* !_FS_READONLY */
483
484
485
486
487 /*-----------------------------------------------------------------------*/
488 /* Get sector# from cluster# */
489 /*-----------------------------------------------------------------------*/
490
491 static
492 DWORD clust2sect ( /* !=0: sector number, 0: failed - invalid cluster# */
493 FATFS *fs, /* File system object */
494 DWORD clst /* Cluster# to be converted */
495 )
496 {
497 clst -= 2;
498 if (clst >= (fs->max_clust - 2)) return 0; /* Invalid cluster# */
499 return clst * fs->csize + fs->database;
500 }
501
502
503
504
505 /*-----------------------------------------------------------------------*/
506 /* Seek directory index */
507 /*-----------------------------------------------------------------------*/
508
509 static
510 FRESULT dir_seek (
511 DIR *dj, /* Pointer to directory object */
512 WORD idx /* Directory index number */
513 )
514 {
515 DWORD clst;
516 WORD ic;
517
518
519 dj->index = idx;
520 clst = dj->sclust;
521 if (clst == 1 || clst >= dj->fs->max_clust) /* Check start cluster range */
522 return FR_INT_ERR;
523
524 if (clst == 0) { /* Static table */
525 if (idx >= dj->fs->n_rootdir) /* Index is out of range */
526 return FR_INT_ERR;
527 dj->sect = dj->fs->dirbase + idx / (SS(dj->fs) / 32);
528 }
529 else { /* Dynamic table */
530 ic = SS(dj->fs) / 32 * dj->fs->csize; /* Indexes per cluster */
531 while (idx >= ic) { /* Follow cluster chain */
532 clst = get_cluster(dj->fs, clst); /* Get next cluster */
533 if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
534 if (clst < 2 || clst >= dj->fs->max_clust) /* Reached to end of table or int error */
535 return FR_INT_ERR;
536 idx -= ic;
537 }
538 dj->clust = clst;
539 dj->sect = clust2sect(dj->fs, clst) + idx / (SS(dj->fs) / 32);
540 }
541 dj->dir = dj->fs->win + (idx % (SS(dj->fs) / 32)) * 32;
542
543 return FR_OK; /* Seek succeeded */
544 }
545
546
547
548
549 /*-----------------------------------------------------------------------*/
550 /* Move directory index next */
551 /*-----------------------------------------------------------------------*/
552
553 static
554 FRESULT dir_next ( /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not streach */
555 DIR *dj, /* Pointer to directory object */
556 BOOL streach /* FALSE: Do not streach table, TRUE: Streach table if needed */
557 )
558 {
559 DWORD clst;
560 WORD i;
561
562
563 i = dj->index + 1;
564 if (!i || !dj->sect) /* Report EOT when index has reached 65535 */
565 return FR_NO_FILE;
566
567 if (!(i % (SS(dj->fs) / 32))) { /* Sector changed? */
568 dj->sect++; /* Next sector */
569
570 if (dj->sclust == 0) { /* Static table */
571 if (i >= dj->fs->n_rootdir) /* Report EOT when end of table */
572 return FR_NO_FILE;
573 }
574 else { /* Dynamic table */
575 if (((i / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0) { /* Cluster changed? */
576 clst = get_cluster(dj->fs, dj->clust); /* Get next cluster */
577 if (clst <= 1) return FR_INT_ERR;
578 if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
579 if (clst >= dj->fs->max_clust) { /* When it reached end of dinamic table */
580 #if !_FS_READONLY
581 BYTE c;
582 if (!streach) return FR_NO_FILE; /* When do not streach, report EOT */
583 clst = create_chain(dj->fs, dj->clust); /* Streach cluster chain */
584 if (clst == 0) return FR_DENIED; /* No free cluster */
585 if (clst == 1) return FR_INT_ERR;
586 if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
587 /* Clean-up streached table */
588 if (move_window(dj->fs, 0)) return FR_DISK_ERR; /* Flush active window */
589 mem_set(dj->fs->win, 0, SS(dj->fs)); /* Clear window buffer */
590 dj->fs->winsect = clust2sect(dj->fs, clst); /* Cluster start sector */
591 for (c = 0; c < dj->fs->csize; c++) { /* Fill the new cluster with 0 */
592 dj->fs->wflag = 1;
593 if (move_window(dj->fs, 0)) return FR_DISK_ERR;
594 dj->fs->winsect++;
595 }
596 dj->fs->winsect -= c; /* Rewind window address */
597 #else
598 return FR_NO_FILE; /* Report EOT */
599 #endif
600 }
601 dj->clust = clst; /* Initialize data for new cluster */
602 dj->sect = clust2sect(dj->fs, clst);
603 }
604 }
605 }
606
607 dj->index = i;
608 dj->dir = dj->fs->win + (i % (SS(dj->fs) / 32)) * 32;
609
610 return FR_OK;
611 }
612
613
614
615
616 /*-----------------------------------------------------------------------*/
617 /* Test/Pick/Fit an LFN segment from/to directory entry */
618 /*-----------------------------------------------------------------------*/
619 #if _USE_LFN
620 static
621 const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30}; /* Offset of LFN chars in the directory entry */
622
623
624 static
625 BOOL test_lfn ( /* TRUE:Matched, FALSE:Not matched */
626 WCHAR *lfnbuf, /* Pointer to the LFN to be compared */
627 BYTE *dir /* Pointer to the directory entry containing a part of LFN */
628 )
629 {
630 int i, s;
631 WCHAR wc1, wc2;
632
633
634 i = ((dir[LDIR_Ord] & 0xBF) - 1) * 13; /* Offset in the LFN buffer */
635 s = 0;
636 do {
637 if (i >= _MAX_LFN) return FALSE; /* Out of buffer range? */
638 wc1 = LD_WORD(dir+LfnOfs[s]); /* Get both characters to compare */
639 wc2 = lfnbuf[i++];
640 if (IsLower(wc1)) wc1 -= 0x20; /* Compare it (ignore case) */
641 if (IsLower(wc2)) wc2 -= 0x20;
642 if (wc1 != wc2) return FALSE;
643 } while (++s < 13 && wc1); /* Repeat until last char or a NUL char is processed */
644
645 return TRUE; /* The LFN entry matched */
646 }
647
648
649
650 static
651 BOOL pick_lfn ( /* TRUE:Succeeded, FALSE:Buffer overflow */
652 WCHAR *lfnbuf, /* Pointer to the Unicode-LFN buffer */
653 BYTE *dir /* Pointer to the directory entry */
654 )
655 {
656 int i, s;
657 WCHAR wchr;
658
659
660 i = ((dir[LDIR_Ord] & 0xBF) - 1) * 13; /* Offset in the LFN buffer */
661 s = 0;
662 do {
663 wchr = LD_WORD(dir+LfnOfs[s]); /* Get an LFN char */
664 if (!wchr) break; /* End of LFN? */
665 if (i >= _MAX_LFN) return FALSE; /* Buffer overflow */
666 lfnbuf[i++] = wchr; /* Store it */
667 } while (++s < 13); /* Repeat until last char is copied */
668 if (dir[LDIR_Ord] & 0x40) lfnbuf[i] = 0; /* Put terminator if last LFN entry */
669
670 return TRUE;
671 }
672
673
674 #if !_FS_READONLY
675 static
676 void fit_lfn (
677 const WCHAR *lfnbuf, /* Pointer to the LFN buffer */
678 BYTE *dir, /* Pointer to the directory entry */
679 BYTE ord, /* LFN order (1-20) */
680 BYTE sum /* SFN sum */
681 )
682 {
683 int i, s;
684 WCHAR wchr;
685
686
687 dir[LDIR_Chksum] = sum; /* Set check sum */
688 dir[LDIR_Attr] = AM_LFN; /* Set attribute. LFN entry */
689 dir[LDIR_Type] = 0;
690 ST_WORD(dir+LDIR_FstClusLO, 0);
691
692 i = (ord - 1) * 13; /* Offset in the LFN buffer */
693 s = wchr = 0;
694 do {
695 if (wchr != 0xFFFF) wchr = lfnbuf[i++]; /* Get an effective char */
696 ST_WORD(dir+LfnOfs[s], wchr); /* Put it */
697 if (!wchr) wchr = 0xFFFF; /* Padding chars following last char */
698 } while (++s < 13);
699 if (wchr == 0xFFFF || !lfnbuf[i]) ord |= 0x40;/* Bottom LFN part is the start of LFN sequence */
700 dir[LDIR_Ord] = ord; /* Set the LFN order */
701 }
702
703 #endif
704 #endif
705
706
707
708 /*-----------------------------------------------------------------------*/
709 /* Create numbered name */
710 /*-----------------------------------------------------------------------*/
711 #if _USE_LFN
712 void gen_numname (
713 BYTE *dst, /* Pointer to genartated SFN */
714 const BYTE *src, /* Pointer to source SFN to be modified */
715 const WCHAR *lfn, /* Pointer to LFN */
716 WORD num /* Sequense number */
717 )
718 {
719 char ns[8];
720 int i, j;
721
722
723 mem_cpy(dst, src, 11);
724
725 if (num > 5) { /* On many collisions, generate a hash number instead of sequencial number */
726 do num = (num >> 1) + (num << 15) + (WORD)*lfn++; while (*lfn);
727 }
728
729 /* itoa */
730 i = 7;
731 do {
732 ns[i--] = (num % 10) + '0';
733 num /= 10;
734 } while (num);
735 ns[i] = '~';
736
737 /* Append the number */
738 for (j = 0; j < i && dst[j] != ' '; j++) {
739 if (IsDBCS1(dst[j])) {
740 if (j == i - 1) break;
741 j++;
742 }
743 }
744 do {
745 dst[j++] = (i < 8) ? ns[i++] : ' ';
746 } while (j < 8);
747 }
748 #endif
749
750
751
752
753 /*-----------------------------------------------------------------------*/
754 /* Calculate sum of an SFN */
755 /*-----------------------------------------------------------------------*/
756 #if _USE_LFN
757 static
758 BYTE sum_sfn (
759 const BYTE *dir /* Ptr to directory entry */
760 )
761 {
762 BYTE sum = 0;
763 int n = 11;
764
765 do sum = (sum >> 1) + (sum << 7) + *dir++; while (--n);
766 return sum;
767 }
768 #endif
769
770
771
772
773 /*-----------------------------------------------------------------------*/
774 /* Find an object in the directory */
775 /*-----------------------------------------------------------------------*/
776
777 static
778 FRESULT dir_find (
779 DIR *dj /* Pointer to the directory object linked to the file name */
780 )
781 {
782 FRESULT res;
783 BYTE a, c, lfen, ord, sum, *dir;
784
785
786 res = dir_seek(dj, 0); /* Rewind directory object */
787 if (res != FR_OK) return res;
788
789 ord = sum = 0xFF; lfen = *(dj->fn+11) & 1;
790 do {
791 res = move_window(dj->fs, dj->sect);
792 if (res != FR_OK) break;
793 dir = dj->dir; /* Ptr to the directory entry of current index */
794 c = dir[DIR_Name];
795 if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */
796 a = dir[DIR_Attr] & AM_MASK;
797 #if _USE_LFN /* LFN configuration */
798 if (c == 0xE5 || c == '.' || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */
799 ord = 0xFF;
800 } else {
801 if (a == AM_LFN) { /* An LFN entry is found */
802 if (dj->lfn) {
803 if (c & 0x40) { /* Is it start of LFN sequence? */
804 sum = dir[LDIR_Chksum];
805 c &= 0xBF; ord = c; /* LFN start order */
806 dj->lfn_idx = dj->index;
807 }
808 /* Check LFN validity. Compare LFN if it is out of 8.3 format */
809 ord = (c == ord && sum == dir[LDIR_Chksum] && (!lfen || test_lfn(dj->lfn, dir))) ? ord - 1 : 0xFF;
810 }
811 } else { /* An SFN entry is found */
812 if (ord || sum != sum_sfn(dir)) { /* Did not LFN match? */
813 dj->lfn_idx = 0xFFFF;
814 ord = 0xFF;
815 }
816 if (lfen) { /* Match LFN if it is out of 8.3 format */
817 if (ord == 0) break;
818 } else { /* Match SFN if LFN is in 8.3 format */
819 if (!mem_cmp(dir, dj->fn, 11)) break;
820 }
821 }
822 }
823 #else /* Non LFN configuration */
824 if (c != 0xE5 && c != '.' && !(a & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */
825 break;
826 #endif
827 res = dir_next(dj, FALSE); /* Next entry */
828 } while (res == FR_OK);
829
830 return res;
831 }
832
833
834
835
836 /*-----------------------------------------------------------------------*/
837 /* Read an object from the directory */
838 /*-----------------------------------------------------------------------*/
839 #if _FS_MINIMIZE <= 2
840 static
841 FRESULT dir_read (
842 DIR *dj /* Pointer to the directory object to store read object name */
843 )
844 {
845 FRESULT res;
846 BYTE a, c, ord, sum, *dir;
847
848
849 ord = sum = 0xFF;
850 res = FR_NO_FILE;
851 while (dj->sect) {
852 res = move_window(dj->fs, dj->sect);
853 if (res != FR_OK) break;
854 dir = dj->dir; /* Ptr to the directory entry of current index */
855 c = dir[DIR_Name];
856 if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */
857 a = dir[DIR_Attr] & AM_MASK;
858 #if _USE_LFN /* LFN configuration */
859 if (c == 0xE5 || c == '.' || ((a & AM_VOL) && a != AM_LFN)) { /* An entry without valid data */
860 ord = 0xFF;
861 } else {
862 if (a == AM_LFN) { /* An LFN entry is found */
863 if (c & 0x40) { /* Is it start of LFN sequence? */
864 sum = dir[LDIR_Chksum];
865 c &= 0xBF; ord = c;
866 dj->lfn_idx = dj->index;
867 }
868 /* Check LFN validity and capture it */
869 ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dj->lfn, dir)) ? ord - 1 : 0xFF;
870 } else { /* An SFN entry is found */
871 if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN entry? */
872 dj->lfn_idx = 0xFFFF; /* No LFN. */
873 break;
874 }
875 }
876 #else /* Non LFN configuration */
877 if (c != 0xE5 && c != '.' && !(a & AM_VOL)) /* Is it a valid entry? */
878 break;
879 #endif
880 res = dir_next(dj, FALSE); /* Next entry */
881 if (res != FR_OK) break;
882 }
883
884 if (res != FR_OK) dj->sect = 0;
885
886 return res;
887 }
888 #endif
889
890
891
892 /*-----------------------------------------------------------------------*/
893 /* Register an object to the directory */
894 /*-----------------------------------------------------------------------*/
895 #if !_FS_READONLY
896 static
897 FRESULT dir_register ( /* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */
898 DIR *dj /* Target directory with object name to be created */
899 )
900 {
901 FRESULT res;
902 BYTE c, *dir;
903
904 #if _USE_LFN /* LFN configuration */
905 WORD n, ne, is;
906 BYTE sn[12], *fn, sum;
907 WCHAR *lfn;
908
909 fn = dj->fn; lfn = dj->lfn;
910 mem_cpy(sn, fn, 12);
911 if (sn[11] & 1) { /* When LFN is out of 8.3 format, generate a numbered name */
912 fn[11] = 0; dj->lfn = NULL; /* Find only SFN */
913 for (n = 1; n < 100; n++) {
914 gen_numname(fn, sn, lfn, n); /* Generate a numbered name */
915 res = dir_find(dj); /* Check if the name collides with existing SFN */
916 if (res != FR_OK) break;
917 }
918 if (n == 100) return FR_DENIED; /* Abort if too many collisions */
919 if (res != FR_NO_FILE) return res; /* Abort if the result is other than 'not collided' */
920 fn[11] = sn[11]; dj->lfn = lfn;
921 }
922 if (sn[11] & 2) { /* When eliminate LFN, reserve only an SFN entry. */
923 ne = 1;
924 } else { /* Otherwise reserve an SFN + LFN entries. */
925 for (ne = 0; lfn[ne]; ne++) ;
926 ne = (ne + 25) / 13;
927 }
928
929 /* Reserve contiguous entries */
930 res = dir_seek(dj, 0);
931 if (res != FR_OK) return res;
932 n = is = 0;
933 do {
934 res = move_window(dj->fs, dj->sect);
935 if (res != FR_OK) break;
936 c = *dj->dir; /* Check the entry status */
937 if (c == 0xE5 || c == 0) { /* Is it a blank entry? */
938 if (n == 0) is = dj->index; /* First index of the contigulus entry */
939 if (++n == ne) break; /* A contiguous entry that requiered count is found */
940 } else {
941 n = 0; /* Not a blank entry. Restart to search */
942 }
943 res = dir_next(dj, TRUE); /* Next entry with table streach */
944 } while (res == FR_OK);
945
946 if (res == FR_OK && ne > 1) { /* Initialize LFN entry if needed */
947 res = dir_seek(dj, is);
948 if (res == FR_OK) {
949 sum = sum_sfn(dj->fn); /* Sum of the SFN tied to the LFN */
950 ne--;
951 do { /* Store LFN entries in bottom first */
952 res = move_window(dj->fs, dj->sect);
953 if (res != FR_OK) break;
954 fit_lfn(dj->lfn, dj->dir, (BYTE)ne, sum);
955 dj->fs->wflag = 1;
956 res = dir_next(dj, FALSE); /* Next entry */
957 } while (res == FR_OK && --ne);
958 }
959 }
960
961 #else /* Non LFN configuration */
962 res = dir_seek(dj, 0);
963 if (res == FR_OK) {
964 do { /* Find a blank entry for the SFN */
965 res = move_window(dj->fs, dj->sect);
966 if (res != FR_OK) break;
967 c = *dj->dir;
968 if (c == 0xE5 || c == 0) break; /* Is it a blank entry? */
969 res = dir_next(dj, TRUE); /* Next entry with table streach */
970 } while (res == FR_OK);
971 }
972 #endif
973
974 if (res == FR_OK) { /* Initialize the SFN entry */
975 res = move_window(dj->fs, dj->sect);
976 if (res == FR_OK) {
977 dir = dj->dir;
978 mem_set(dir, 0, 32); /* Clean the entry */
979 mem_cpy(dir, dj->fn, 11); /* Put SFN */
980 dir[DIR_NTres] = *(dj->fn+11) & 0x18; /* Put NT flag */
981 dj->fs->wflag = 1;
982 }
983 }
984
985 return res;
986 }
987 #endif /* !_FS_READONLY */
988
989
990
991
992 /*-----------------------------------------------------------------------*/
993 /* Remove an object from the directory */
994 /*-----------------------------------------------------------------------*/
995 #if !_FS_READONLY && !_FS_MINIMIZE
996 static
997 FRESULT dir_remove ( /* FR_OK: Successful, FR_DISK_ERR: A disk error */
998 DIR *dj /* Directory object pointing the entry to be removed */
999 )
1000 {
1001 FRESULT res;
1002
1003 #if _USE_LFN /* LFN configuration */
1004 WORD i;
1005
1006 i = dj->index; /* SFN index */
1007 res = dir_seek(dj, (WORD)((dj->lfn_idx == 0xFFFF) ? i : dj->lfn_idx)); /* Goto the SFN or top of the LFN entries */
1008 if (res == FR_OK) {
1009 do {
1010 res = move_window(dj->fs, dj->sect);
1011 if (res != FR_OK) break;
1012 *dj->dir = 0xE5; /* Mark the entry "deleted" */
1013 dj->fs->wflag = 1;
1014 if (dj->index >= i) break; /* When SFN is deleted, all entries of the object is deleted. */
1015 res = dir_next(dj, FALSE); /* Next entry */
1016 } while (res == FR_OK);
1017 if (res == FR_NO_FILE) res = FR_INT_ERR;
1018 }
1019
1020 #else /* Non LFN configuration */
1021 res = dir_seek(dj, dj->index);
1022 if (res == FR_OK) {
1023 res = move_window(dj->fs, dj->sect);
1024 if (res == FR_OK) {
1025 *dj->dir = 0xE5; /* Mark the entry "deleted" */
1026 dj->fs->wflag = 1;
1027 }
1028 }
1029 #endif
1030
1031 return res;
1032 }
1033 #endif /* !_FS_READONLY */
1034
1035
1036
1037
1038 /*-----------------------------------------------------------------------*/
1039 /* Pick a segment and create the object name in directory form */
1040 /*-----------------------------------------------------------------------*/
1041
1042 static
1043 FRESULT create_name (
1044 DIR *dj, /* Pointer to the directory object */
1045 const char **path /* Pointer to pointer to the segment in the path string */
1046 )
1047 {
1048 #if _USE_LFN
1049 BYTE c, b, cf, *sfn;
1050 WCHAR w, *lfn;
1051 int i, ni, si, di;
1052 const char *p;
1053
1054 /* Create LFN in Unicode */
1055 si = di = 0;
1056 p = *path;
1057 lfn = dj->lfn;
1058 for (;;) {
1059 w = (BYTE)p[si++]; /* Get a character */
1060 if (w < ' ' || w == '/' || w == '\\') break; /* Break on end of segment */
1061 if (IsDBCS1(w)) { /* If it is DBC 1st byte */
1062 c = p[si++]; /* Get 2nd byte */
1063 if (!IsDBCS2(c)) /* Reject invalid DBC */
1064 return FR_INVALID_NAME;
1065 w = (w << 8) + c;
1066 } else {
1067 if (chk_chr("\"*:<>\?|\x7F", w)) /* Reject unallowable chars for LFN */
1068 return FR_INVALID_NAME;
1069 }
1070 w = ff_convert(w, 1); /* Convert OEM to Unicode, store it */
1071 if (!w || di >= _MAX_LFN) /* Reject invalid code or too long name */
1072 return FR_INVALID_NAME;
1073 lfn[di++] = w;
1074 }
1075 *path = &p[si]; /* Rerurn pointer to the next segment */
1076 cf = (w < ' ') ? 4 : 0; /* Set last segment flag if end of path */
1077
1078 while (di) { /* Strip trailing spaces and dots */
1079 w = lfn[di - 1];
1080 if (w != ' ' && w != '.') break;
1081 di--;
1082 }
1083 if (!di) return FR_INVALID_NAME; /* Reject null string */
1084
1085 lfn[di] = 0; /* LFN is created */
1086
1087 /* Create SFN in directory form */
1088 sfn = dj->fn;
1089 mem_set(sfn, ' ', 11);
1090 for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++) ; /* Strip leading spaces and dots */
1091 if (si) cf |= 1;
1092 while (di && lfn[di - 1] != '.') di--; /* Find extension (di<=si: no extension) */
1093
1094 b = i = 0; ni = 8;
1095 for (;;) {
1096 w = lfn[si++]; /* Get an LFN char */
1097 if (w == 0) break; /* Break when enf of the LFN */
1098 if (w == ' ' || (w == '.' && si != di)) { /* Remove spaces and dots */
1099 cf |= 1; continue;
1100 }
1101 if (i >= ni || si == di) { /* Here is extension or end of SFN */
1102 if (ni == 11) { /* Extension is longer than 3 bytes */
1103 cf |= 1; break;
1104 }
1105 if (si != di) cf |= 1; /* File name is longer than 8 bytes */
1106 if (si > di) break; /* No extension */
1107 si = di; i = 8; ni = 11; /* Enter extension section */
1108 b <<= 2; continue;
1109 }
1110 w = ff_convert(w, 0); /* Unicode -> OEM code */
1111 if (w >= 0x80) cf |= 0x20; /* If there is any extended char, force create an LFN */
1112 if (w >= 0x100) { /* Double byte char */
1113 if (i >= ni - 1) {
1114 cf |= 1; i = ni; continue;
1115 }
1116 sfn[i++] = (BYTE)(w >> 8);
1117 } else { /* Single byte char */
1118 if (chk_chr("+,;[=]", w)) { /* Replace unallowable chars for SFN */
1119 w = '_'; cf |= 1;
1120 } else {
1121 if (IsUpper(w)) { /* Large capital */
1122 b |= 2;
1123 } else {
1124 if (IsLower(w)) { /* Small capital */
1125 b |= 1; w -= 0x20;
1126 }
1127 }
1128 }
1129 }
1130 sfn[i++] = (BYTE)w;
1131 }
1132 if (sfn[0] == 0xE5) sfn[0] = 0x05; /* When first char collides with 0xE5, replace it with 0x05 */
1133
1134 if (ni == 8) b <<= 2;
1135 if ((cf & 0x21) == 0) { /* When LFN is in 8.3 format without extended char, NT flags are created */
1136 if ((b & 0x03) == 0x01) cf |= 0x10; /* NT flag (Extension has only small capital) */
1137 if ((b & 0x0C) == 0x04) cf |= 0x08; /* NT flag (Filename has only small capital) */
1138 if ((b & 0x0C) != 0x0C && (b & 0x03) != 0x03) cf |= 2; /* Eliminate LFN when non composite capitals */
1139 }
1140
1141 sfn[11] = cf; /* SFN is created */
1142
1143 #else
1144 BYTE c, d, b, *sfn;
1145 int ni, si, i;
1146 const char *p;
1147
1148 /* Create file name in directory form */
1149 sfn = dj->fn;
1150 mem_set(sfn, ' ', 11);
1151 si = i = b = 0; ni = 8;
1152 p = *path;
1153 for (;;) {
1154 c = p[si++];
1155 if (c < ' ' || c == '/' || c == '\\') break; /* Break on end of segment */
1156 if (c == '.' || i >= ni) {
1157 if (ni != 8 || c != '.') return FR_INVALID_NAME;
1158 i = 8; ni = 11;
1159 b <<= 2; continue;
1160 }
1161 if (c >= 0x80) b |= 3; /* If there is any extended char, eliminate NT flag */
1162 if (IsDBCS1(c)) { /* If it is DBC 1st byte */
1163 d = p[si++]; /* Get 2nd byte */
1164 if (!IsDBCS2(d) || i >= ni - 1) /* Reject invalid DBC */
1165 return FR_INVALID_NAME;
1166 sfn[i++] = c;
1167 sfn[i++] = d;
1168 } else {
1169 if (chk_chr(" +,;[=]\"*:<>\?|\x7F", c)) /* Reject unallowable chrs for SFN */
1170 return FR_INVALID_NAME;
1171 if (IsUpper(c)) {
1172 b |= 2;
1173 } else {
1174 if (IsLower(c)) {
1175 b |= 1; c -= 0x20;
1176 }
1177 }
1178 sfn[i++] = c;
1179 }
1180 }
1181 *path = &p[si]; /* Rerurn pointer to the next segment */
1182 c = (c < ' ') ? 4 : 0; /* Set last segment flag if end of path */
1183
1184 if (!i) return FR_INVALID_NAME; /* Reject null string */
1185 if (sfn[0] == 0xE5) sfn[0] = 0x05; /* When first char collides with 0xE5, replace it with 0x05 */
1186
1187 if (ni == 8) b <<= 2;
1188 if ((b & 0x03) == 0x01) c |= 0x10; /* NT flag (Extension has only small capital) */
1189 if ((b & 0x0C) == 0x04) c |= 0x08; /* NT flag (Filename has only small capital) */
1190
1191 sfn[11] = c; /* Store NT flag, File name is created */
1192 #endif
1193
1194 return FR_OK;
1195 }
1196
1197
1198
1199
1200 /*-----------------------------------------------------------------------*/
1201 /* Get file information from directory entry */
1202 /*-----------------------------------------------------------------------*/
1203 #if _FS_MINIMIZE <= 1
1204 static
1205 void get_fileinfo ( /* No return code */
1206 DIR *dj, /* Pointer to the directory object */
1207 FILINFO *fno /* Pointer to store the file information */
1208 )
1209 {
1210 int i;
1211 BYTE c, nt, *dir;
1212 char *p;
1213
1214
1215 p = fno->fname;
1216 if (dj->sect) {
1217 dir = dj->dir;
1218 nt = dir[DIR_NTres]; /* NT flag */
1219 for (i = 0; i < 8; i++) { /* Copy file name body */
1220 c = dir[i];
1221 if (c == ' ') break;
1222 if (c == 0x05) c = 0xE5;
1223 if ((nt & 0x08) && IsUpper(c)) c += 0x20;
1224 *p++ = c;
1225 }
1226 if (dir[8] != ' ') { /* Copy file name extension */
1227 *p++ = '.';
1228 for (i = 8; i < 11; i++) {
1229 c = dir[i];
1230 if (c == ' ') break;
1231 if ((nt & 0x10) && IsUpper(c)) c += 0x20;
1232 *p++ = c;
1233 }
1234 }
1235 fno->fattrib = dir[DIR_Attr]; /* Attribute */
1236 fno->fsize = LD_DWORD(dir+DIR_FileSize); /* Size */
1237 fno->fdate = LD_WORD(dir+DIR_WrtDate); /* Date */
1238 fno->ftime = LD_WORD(dir+DIR_WrtTime); /* Time */
1239 }
1240 *p = 0;
1241
1242 #if _USE_LFN
1243 p = fno->lfname;
1244 if (p) {
1245 WCHAR wchr, *lfn;
1246
1247 i = 0;
1248 if (dj->sect && dj->lfn_idx != 0xFFFF) {/* Get LFN if available */
1249 lfn = dj->lfn;
1250 while ((wchr = *lfn++) != 0) { /* Get an LFN char */
1251 wchr = ff_convert(wchr, 0); /* Unicode -> OEM code */
1252 if (!wchr) { i = 0; break; } /* Conversion error, no LFN */
1253 if (_DF1S && wchr >= 0x100) /* Put 1st byte if it is a DBC */
1254 p[i++] = (char)(wchr >> 8);
1255 p[i++] = (char)wchr;
1256 if (i >= fno->lfsize) { i = 0; break; } /* Buffer overrun, no LFN */
1257 }
1258 }
1259 p[i] = 0; /* Terminator */
1260 }
1261 #endif
1262 }
1263 #endif /* _FS_MINIMIZE <= 1 */
1264
1265
1266
1267
1268 /*-----------------------------------------------------------------------*/
1269 /* Follow a file path */
1270 /*-----------------------------------------------------------------------*/
1271
1272 static
1273 FRESULT follow_path ( /* FR_OK(0): successful, !=0: error code */
1274 DIR *dj, /* Directory object to return last directory and found object */
1275 const char *path /* Full-path string to find a file or directory */
1276 )
1277 {
1278 FRESULT res;
1279 BYTE *dir, last;
1280
1281
1282 if (*path == '/' || *path == '\\' ) path++; /* Strip heading separator */
1283
1284 dj->sclust = /* Set start directory (root dir) */
1285 (dj->fs->fs_type == FS_FAT32) ? dj->fs->dirbase : 0;
1286
1287 if ((BYTE)*path < ' ') { /* Null path means the root directory */
1288 res = dir_seek(dj, 0);
1289 dj->dir = NULL;
1290
1291 } else { /* Follow path */
1292 for (;;) {
1293 res = create_name(dj, &path); /* Get a segment */
1294 if (res != FR_OK) break;
1295 res = dir_find(dj); /* Find it */
1296 last = *(dj->fn+11) & 4;
1297 if (res != FR_OK) { /* Could not find the object */
1298 if (res == FR_NO_FILE && !last)
1299 res = FR_NO_PATH;
1300 break;
1301 }
1302 if (last) break; /* Last segment match. Function completed. */
1303 dir = dj->dir; /* There is next segment. Follow the sub directory */
1304 if (!(dir[DIR_Attr] & AM_DIR)) { /* Cannot follow because it is a file */
1305 res = FR_NO_PATH; break;
1306 }
1307 dj->sclust = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO);
1308 }
1309 }
1310
1311 return res;
1312 }
1313
1314
1315
1316
1317 /*-----------------------------------------------------------------------*/
1318 /* Load boot record and check if it is an FAT boot record */
1319 /*-----------------------------------------------------------------------*/
1320
1321 static
1322 BYTE check_fs ( /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record, 3:Error */
1323 FATFS *fs, /* File system object */
1324 DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */
1325 )
1326 {
1327 if (disk_read(fs->drive, fs->win, sect, 1) != RES_OK) /* Load boot record */
1328 return 3;
1329 if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55) /* Check record signature (always placed at offset 510 even if the sector size is >512) */
1330 return 2;
1331
1332 if (!mem_cmp(&fs->win[BS_FilSysType], "FAT", 3)) /* Check FAT signature */
1333 return 0;
1334 if (!mem_cmp(&fs->win[BS_FilSysType32], "FAT32", 5) && !(fs->win[BPB_ExtFlags] & 0x80))
1335 return 0;
1336
1337 return 1;
1338 }
1339
1340
1341
1342
1343 /*-----------------------------------------------------------------------*/
1344 /* Make sure that the file system is valid */
1345 /*-----------------------------------------------------------------------*/
1346
1347 static
1348 FRESULT auto_mount ( /* FR_OK(0): successful, !=0: any error occured */
1349 const char **path, /* Pointer to pointer to the path name (drive number) */
1350 FATFS **rfs, /* Pointer to pointer to the found file system object */
1351 BYTE chk_wp /* !=0: Check media write protection for write access */
1352 )
1353 {
1354 FRESULT res;
1355 BYTE vol, fmt, *tbl;
1356 DSTATUS stat;
1357 DWORD bsect, fsize, tsect, mclst;
1358 const char *p = *path;
1359 FATFS *fs;
1360
1361
1362 /* Get logical drive number from the path name */
1363 vol = p[0] - '0'; /* Is there a drive number? */
1364 if (vol <= 9 && p[1] == ':') {
1365 p += 2; /* Found a drive number, get and strip it */
1366 *path = p; /* Return pointer to the path name */
1367 } else {
1368 vol = 0; /* No drive number is given, use drive number 0 as default */
1369 }
1370
1371 /* Check if the logical drive number is valid or not */
1372 if (vol >= _DRIVES) return FR_INVALID_DRIVE; /* Is the drive number valid? */
1373 *rfs = fs = FatFs[vol]; /* Returen pointer to the corresponding file system object */
1374 if (!fs) return FR_NOT_ENABLED; /* Is the file system object registered? */
1375
1376 ENTER_FF(fs); /* Lock file system */
1377
1378 if (fs->fs_type) { /* If the logical drive has been mounted */
1379 stat = disk_status(fs->drive);
1380 if (!(stat & STA_NOINIT)) { /* and physical drive is kept initialized (has not been changed), */
1381 #if !_FS_READONLY
1382 if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
1383 return FR_WRITE_PROTECTED;
1384 #endif
1385 return FR_OK; /* The file system object is valid */
1386 }
1387 }
1388
1389 /* The logical drive must be re-mounted. Following code attempts to mount the volume */
1390
1391 fs->fs_type = 0; /* Clear the file system object */
1392 fs->drive = LD2PD(vol); /* Bind the logical drive and a physical drive */
1393 stat = disk_initialize(fs->drive); /* Initialize low level disk I/O layer */
1394 if (stat & STA_NOINIT) /* Check if the drive is ready */
1395 return FR_NOT_READY;
1396 #if _MAX_SS != 512 /* Get disk sector size if needed */
1397 if (disk_ioctl(fs->drive, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS)
1398 return FR_NO_FILESYSTEM;
1399 #endif
1400 #if !_FS_READONLY
1401 if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
1402 return FR_WRITE_PROTECTED;
1403 #endif
1404 /* Search FAT partition on the drive */
1405 fmt = check_fs(fs, bsect = 0); /* Check sector 0 as an SFD format */
1406 if (fmt == 1) { /* Not an FAT boot record, it may be patitioned */
1407 /* Check a partition listed in top of the partition table */
1408 tbl = &fs->win[MBR_Table + LD2PT(vol) * 16]; /* Partition table */
1409 if (tbl[4]) { /* Is the partition existing? */
1410 bsect = LD_DWORD(&tbl[8]); /* Partition offset in LBA */
1411 fmt = check_fs(fs, bsect); /* Check the partition */
1412 }
1413 }
1414 if (fmt == 3) return FR_DISK_ERR;
1415 if (fmt || LD_WORD(fs->win+BPB_BytsPerSec) != SS(fs)) /* No valid FAT patition is found */
1416 return FR_NO_FILESYSTEM;
1417
1418 /* Initialize the file system object */
1419 fsize = LD_WORD(fs->win+BPB_FATSz16); /* Number of sectors per FAT */
1420 if (!fsize) fsize = LD_DWORD(fs->win+BPB_FATSz32);
1421 fs->sects_fat = fsize;
1422 fs->n_fats = fs->win[BPB_NumFATs]; /* Number of FAT copies */
1423 fsize *= fs->n_fats; /* (Number of sectors in FAT area) */
1424 fs->fatbase = bsect + LD_WORD(fs->win+BPB_RsvdSecCnt); /* FAT start sector (lba) */
1425 fs->csize = fs->win[BPB_SecPerClus]; /* Number of sectors per cluster */
1426 fs->n_rootdir = LD_WORD(fs->win+BPB_RootEntCnt); /* Nmuber of root directory entries */
1427 tsect = LD_WORD(fs->win+BPB_TotSec16); /* Number of sectors on the file system */
1428 if (!tsect) tsect = LD_DWORD(fs->win+BPB_TotSec32);
1429 fs->max_clust = mclst = (tsect /* Last cluster# + 1 */
1430 - LD_WORD(fs->win+BPB_RsvdSecCnt) - fsize - fs->n_rootdir / (SS(fs)/32)
1431 ) / fs->csize + 2;
1432
1433 fmt = FS_FAT12; /* Determine the FAT sub type */
1434 if (mclst >= 0xFF7) fmt = FS_FAT16; /* Number of clusters >= 0xFF5 */
1435 if (mclst >= 0xFFF7) fmt = FS_FAT32; /* Number of clusters >= 0xFFF5 */
1436
1437 if (fmt == FS_FAT32)
1438 fs->dirbase = LD_DWORD(fs->win+BPB_RootClus); /* Root directory start cluster */
1439 else
1440 fs->dirbase = fs->fatbase + fsize; /* Root directory start sector (lba) */
1441 fs->database = fs->fatbase + fsize + fs->n_rootdir / (SS(fs)/32); /* Data start sector (lba) */
1442
1443 #if !_FS_READONLY
1444 /* Initialize allocation information */
1445 fs->free_clust = 0xFFFFFFFF;
1446 fs->wflag = 0;
1447 /* Get fsinfo if needed */
1448 if (fmt == FS_FAT32) {
1449 fs->fsi_sector = bsect + LD_WORD(fs->win+BPB_FSInfo);
1450 fs->fsi_flag = 0;
1451 if (disk_read(fs->drive, fs->win, fs->fsi_sector, 1) == RES_OK &&
1452 LD_WORD(fs->win+BS_55AA) == 0xAA55 &&
1453 LD_DWORD(fs->win+FSI_LeadSig) == 0x41615252 &&
1454 LD_DWORD(fs->win+FSI_StrucSig) == 0x61417272) {
1455 fs->last_clust = LD_DWORD(fs->win+FSI_Nxt_Free);
1456 fs->free_clust = LD_DWORD(fs->win+FSI_Free_Count);
1457 }
1458 }
1459 #endif
1460 fs->winsect = 0;
1461 fs->fs_type = fmt; /* FAT syb-type */
1462 fs->id = ++Fsid; /* File system mount ID */
1463 res = FR_OK;
1464
1465 return res;
1466 }
1467
1468
1469
1470
1471 /*-----------------------------------------------------------------------*/
1472 /* Check if the file/dir object is valid or not */
1473 /*-----------------------------------------------------------------------*/
1474
1475 static
1476 FRESULT validate ( /* FR_OK(0): The object is valid, !=0: Invalid */
1477 FATFS *fs, /* Pointer to the file system object */
1478 WORD id /* Member id of the target object to be checked */
1479 )
1480 {
1481 if (!fs || !fs->fs_type || fs->id != id)
1482 return FR_INVALID_OBJECT;
1483
1484 ENTER_FF(fs); /* Lock file system */
1485
1486 if (disk_status(fs->drive) & STA_NOINIT)
1487 return FR_NOT_READY;
1488
1489 return FR_OK;
1490 }
1491
1492
1493
1494
1495 /*--------------------------------------------------------------------------
1496
1497 Public Functions
1498
1499 --------------------------------------------------------------------------*/
1500
1501
1502
1503 /*-----------------------------------------------------------------------*/
1504 /* Mount/Unmount a Locical Drive */
1505 /*-----------------------------------------------------------------------*/
1506
1507 FRESULT f_mount (
1508 BYTE vol, /* Logical drive number to be mounted/unmounted */
1509 FATFS *fs /* Pointer to new file system object (NULL for unmount)*/
1510 )
1511 {
1512 FATFS *rfs;
1513
1514
1515 if (vol >= _DRIVES) /* Check if the drive number is valid */
1516 return FR_INVALID_DRIVE;
1517 rfs = FatFs[vol]; /* Get current state */
1518
1519 if (rfs) {
1520 #if _FS_REENTRANT /* Discard sync object of the current volume */
1521 if (!ff_del_syncobj(fs->sobj)) return FR_INT_ERR;
1522 #endif
1523 rfs->fs_type = 0; /* Clear old fs object */
1524 }
1525
1526 if (fs) {
1527 fs->fs_type = 0; /* Clear new fs object */
1528 #if _FS_REENTRANT /* Create sync object for the new volume */
1529 if (!ff_cre_syncobj(vol, &fs->sobj)) return FR_INT_ERR;
1530 #endif
1531 }
1532 FatFs[vol] = fs; /* Register new fs object */
1533
1534 return FR_OK;
1535 }
1536
1537
1538
1539
1540 /*-----------------------------------------------------------------------*/
1541 /* Open or Create a File */
1542 /*-----------------------------------------------------------------------*/
1543
1544 FRESULT f_open (
1545 FIL *fp, /* Pointer to the blank file object */
1546 const char *path, /* Pointer to the file name */
1547 BYTE mode /* Access mode and file open mode flags */
1548 )
1549 {
1550 FRESULT res;
1551 DIR dj;
1552 NAMEBUF(sfn, lfn);
1553 BYTE *dir;
1554
1555
1556 fp->fs = NULL; /* Clear file object */
1557 #if !_FS_READONLY
1558 mode &= (FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW);
1559 res = auto_mount(&path, &dj.fs, (BYTE)(mode & (FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)));
1560 #else
1561 mode &= FA_READ;
1562 res = auto_mount(&path, &dj.fs, 0);
1563 #endif
1564 if (res != FR_OK) LEAVE_FF(dj.fs, res);
1565 INITBUF(dj, sfn, lfn);
1566 res = follow_path(&dj, path); /* Follow the file path */
1567
1568 #if !_FS_READONLY
1569 /* Create or Open a file */
1570 if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
1571 DWORD ps, cl;
1572
1573 if (res != FR_OK) { /* No file, create new */
1574 if (res == FR_NO_FILE)
1575 res = dir_register(&dj);
1576 if (res != FR_OK) LEAVE_FF(dj.fs, res);
1577 mode |= FA_CREATE_ALWAYS;
1578 dir = dj.dir;
1579 }
1580 else { /* Any object is already existing */
1581 if (mode & FA_CREATE_NEW) /* Cannot create new */
1582 LEAVE_FF(dj.fs, FR_EXIST);
1583 dir = dj.dir;
1584 if (!dir || (dir[DIR_Attr] & (AM_RDO | AM_DIR))) /* Cannot overwrite it (R/O or DIR) */
1585 LEAVE_FF(dj.fs, FR_DENIED);
1586 if (mode & FA_CREATE_ALWAYS) { /* Resize it to zero if needed */
1587 cl = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO); /* Get start cluster */
1588 ST_WORD(dir+DIR_FstClusHI, 0); /* cluster = 0 */
1589 ST_WORD(dir+DIR_FstClusLO, 0);
1590 ST_DWORD(dir+DIR_FileSize, 0); /* size = 0 */
1591 dj.fs->wflag = 1;
1592 ps = dj.fs->winsect; /* Remove the cluster chain */
1593 if (cl) {
1594 res = remove_chain(dj.fs, cl);
1595 if (res) LEAVE_FF(dj.fs, res);
1596 dj.fs->last_clust = cl - 1; /* Reuse the cluster hole */
1597 }
1598 res = move_window(dj.fs, ps);
1599 if (res != FR_OK) LEAVE_FF(dj.fs, res);
1600 }
1601 }
1602 if (mode & FA_CREATE_ALWAYS) {
1603 dir[DIR_Attr] = 0; /* Reset attribute */
1604 ps = get_fattime();
1605 ST_DWORD(dir+DIR_CrtTime, ps); /* Created time */
1606 dj.fs->wflag = 1;
1607 mode |= FA__WRITTEN; /* Set file changed flag */
1608 }
1609 }
1610 /* Open an existing file */
1611 else {
1612 #endif /* !_FS_READONLY */
1613 if (res != FR_OK) LEAVE_FF(dj.fs, res); /* Follow failed */
1614 dir = dj.dir;
1615 if (!dir || (dir[DIR_Attr] & AM_DIR)) /* It is a directory */
1616 LEAVE_FF(dj.fs, FR_NO_FILE);
1617 #if !_FS_READONLY
1618 if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
1619 LEAVE_FF(dj.fs, FR_DENIED);
1620 }
1621 fp->dir_sect = dj.fs->winsect; /* Pointer to the directory entry */
1622 fp->dir_ptr = dj.dir;
1623 #endif
1624 fp->flag = mode; /* File access mode */
1625 fp->org_clust = /* File start cluster */
1626 ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO);
1627 fp->fsize = LD_DWORD(dir+DIR_FileSize); /* File size */
1628 fp->fptr = 0; fp->csect = 255; /* File pointer */
1629 fp->dsect = 0;
1630 fp->fs = dj.fs; fp->id = dj.fs->id; /* Owner file system object of the file */
1631
1632 LEAVE_FF(dj.fs, FR_OK);
1633 }
1634
1635
1636
1637
1638 /*-----------------------------------------------------------------------*/
1639 /* Read File */
1640 /*-----------------------------------------------------------------------*/
1641
1642 FRESULT f_read (
1643 FIL *fp, /* Pointer to the file object */
1644 void *buff, /* Pointer to data buffer */
1645 UINT btr, /* Number of bytes to read */
1646 UINT *br /* Pointer to number of bytes read */
1647 )
1648 {
1649 FRESULT res;
1650 DWORD clst, sect, remain;
1651 UINT rcnt, cc;
1652 BYTE *rbuff = buff;
1653
1654
1655 *br = 0;
1656
1657 res = validate(fp->fs, fp->id); /* Check validity of the object */
1658 if (res != FR_OK) LEAVE_FF(fp->fs, res);
1659 if (fp->flag & FA__ERROR) /* Check abort flag */
1660 LEAVE_FF(fp->fs, FR_INT_ERR);
1661 if (!(fp->flag & FA_READ)) /* Check access mode */
1662 LEAVE_FF(fp->fs, FR_DENIED);
1663 remain = fp->fsize - fp->fptr;
1664 if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */
1665
1666 for ( ; btr; /* Repeat until all data transferred */
1667 rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
1668 if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
1669 if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */
1670 clst = (fp->fptr == 0) ? /* On the top of the file? */
1671 fp->org_clust : get_cluster(fp->fs, fp->curr_clust);
1672 if (clst <= 1) ABORT(fp->fs, FR_INT_ERR);
1673 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
1674 fp->curr_clust = clst; /* Update current cluster */
1675 fp->csect = 0; /* Reset sector offset in the cluster */
1676 }
1677 sect = clust2sect(fp->fs, fp->curr_clust); /* Get current sector */
1678 if (!sect) ABORT(fp->fs, FR_INT_ERR);
1679 sect += fp->csect;
1680 cc = btr / SS(fp->fs); /* When remaining bytes >= sector size, */
1681 if (cc) { /* Read maximum contiguous sectors directly */
1682 if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */
1683 cc = fp->fs->csize - fp->csect;
1684 if (disk_read(fp->fs->drive, rbuff, sect, (BYTE)cc) != RES_OK)
1685 ABORT(fp->fs, FR_DISK_ERR);
1686 fp->csect += (BYTE)cc; /* Next sector address in the cluster */
1687 rcnt = SS(fp->fs) * cc; /* Number of bytes transferred */
1688 continue;
1689 }
1690 #if !_FS_TINY
1691 #if !_FS_READONLY
1692 if (fp->flag & FA__DIRTY) { /* Write sector I/O buffer if needed */
1693 if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK)
1694 ABORT(fp->fs, FR_DISK_ERR);
1695 fp->flag &= (BYTE)~FA__DIRTY;
1696 }
1697 #endif
1698 if (fp->dsect != sect) { /* Fill sector buffer with file data */
1699 if (disk_read(fp->fs->drive, fp->buf, sect, 1) != RES_OK)
1700 ABORT(fp->fs, FR_DISK_ERR);
1701 }
1702 #endif
1703 fp->dsect = sect;
1704 fp->csect++; /* Next sector address in the cluster */
1705 }
1706 rcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Get partial sector data from sector buffer */
1707 if (rcnt > btr) rcnt = btr;
1708 #if _FS_TINY
1709 if (move_window(fp->fs, fp->dsect)) /* Move sector window */
1710 ABORT(fp->fs, FR_DISK_ERR);
1711 mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt); /* Pick partial sector */
1712 #else
1713 mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt); /* Pick partial sector */
1714 #endif
1715 }
1716
1717
1718 LEAVE_FF(fp->fs, FR_OK);
1719 }
1720
1721
1722
1723
1724 #if !_FS_READONLY
1725 /*-----------------------------------------------------------------------*/
1726 /* Write File */
1727 /*-----------------------------------------------------------------------*/
1728
1729 FRESULT f_write (
1730 FIL *fp, /* Pointer to the file object */
1731 const void *buff, /* Pointer to the data to be written */
1732 UINT btw, /* Number of bytes to write */
1733 UINT *bw /* Pointer to number of bytes written */
1734 )
1735 {
1736 FRESULT res;
1737 DWORD clst, sect;
1738 UINT wcnt, cc;
1739 const BYTE *wbuff = buff;
1740
1741
1742 *bw = 0;
1743
1744 res = validate(fp->fs, fp->id); /* Check validity of the object */
1745 if (res != FR_OK) LEAVE_FF(fp->fs, res);
1746 if (fp->flag & FA__ERROR) /* Check abort flag */
1747 LEAVE_FF(fp->fs, FR_INT_ERR);
1748 if (!(fp->flag & FA_WRITE)) /* Check access mode */
1749 LEAVE_FF(fp->fs, FR_DENIED);
1750 if (fp->fsize + btw < fp->fsize) btw = 0; /* File size cannot reach 4GB */
1751
1752 for ( ; btw; /* Repeat until all data transferred */
1753 wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
1754 if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
1755 if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */
1756 if (fp->fptr == 0) { /* On the top of the file? */
1757 clst = fp->org_clust; /* Follow from the origin */
1758 if (clst == 0) /* When there is no cluster chain, */
1759 fp->org_clust = clst = create_chain(fp->fs, 0); /* Create a new cluster chain */
1760 } else { /* Middle or end of the file */
1761 clst = create_chain(fp->fs, fp->curr_clust); /* Follow or streach cluster chain */
1762 }
1763 if (clst == 0) break; /* Could not allocate a new cluster (disk full) */
1764 if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
1765 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
1766 fp->curr_clust = clst; /* Update current cluster */
1767 fp->csect = 0; /* Reset sector address in the cluster */
1768 }
1769 #if _FS_TINY
1770 if (fp->fs->winsect == fp->dsect && move_window(fp->fs, 0)) /* Write back data buffer prior to following direct transfer */
1771 ABORT(fp->fs, FR_DISK_ERR);
1772 #else
1773 if (fp->flag & FA__DIRTY) { /* Write back data buffer prior to following direct transfer */
1774 if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK)
1775 ABORT(fp->fs, FR_DISK_ERR);
1776 fp->flag &= (BYTE)~FA__DIRTY;
1777 }
1778 #endif
1779 sect = clust2sect(fp->fs, fp->curr_clust); /* Get current sector */
1780 if (!sect) ABORT(fp->fs, FR_INT_ERR);
1781 sect += fp->csect;
1782 cc = btw / SS(fp->fs); /* When remaining bytes >= sector size, */
1783 if (cc) { /* Write maximum contiguous sectors directly */
1784 if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */
1785 cc = fp->fs->csize - fp->csect;
1786 if (disk_write(fp->fs->drive, wbuff, sect, (BYTE)cc) != RES_OK)
1787 ABORT(fp->fs, FR_DISK_ERR);
1788 #if _FS_TINY
1789 if (fp->fs->winsect - sect < cc) { /* Refill sector cache if it gets dirty by the direct write */
1790 mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
1791 fp->fs->wflag = 0;
1792 }
1793 #else
1794 if (fp->dsect - sect < cc) { /* Refill sector cache if it gets dirty by the direct write */
1795 mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
1796 fp->flag &= ~FA__DIRTY;
1797 }
1798 #endif
1799 fp->csect += (BYTE)cc; /* Next sector address in the cluster */
1800 wcnt = SS(fp->fs) * cc; /* Number of bytes transferred */
1801 continue;
1802 }
1803 #if _FS_TINY
1804 if (fp->fptr >= fp->fsize) { /* Avoid silly buffer filling at growing edge */
1805 if (move_window(fp->fs, 0)) ABORT(fp->fs, FR_DISK_ERR);
1806 fp->fs->winsect = sect;
1807 }
1808 #else
1809 if (fp->dsect != sect) { /* Fill sector buffer with file data */
1810 if (fp->fptr < fp->fsize &&
1811 disk_read(fp->fs->drive, fp->buf, sect, 1) != RES_OK)
1812 ABORT(fp->fs, FR_DISK_ERR);
1813 }
1814 #endif
1815 fp->dsect = sect;
1816 fp->csect++; /* Next sector address in the cluster */
1817 }
1818 wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Put partial sector into file I/O buffer */
1819 if (wcnt > btw) wcnt = btw;
1820 #if _FS_TINY
1821 if (move_window(fp->fs, fp->dsect)) /* Move sector window */
1822 ABORT(fp->fs, FR_DISK_ERR);
1823 mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt); /* Fit partial sector */
1824 fp->fs->wflag = 1;
1825 #else
1826 mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt); /* Fit partial sector */
1827 fp->flag |= FA__DIRTY;
1828 #endif
1829 }
1830
1831 if (fp->fptr > fp->fsize) fp->fsize = fp->fptr; /* Update file size if needed */
1832 fp->flag |= FA__WRITTEN; /* Set file changed flag */
1833
1834 LEAVE_FF(fp->fs, FR_OK);
1835 }
1836
1837
1838
1839
1840 /*-----------------------------------------------------------------------*/
1841 /* Synchronize the File Object */
1842 /*-----------------------------------------------------------------------*/
1843
1844 FRESULT f_sync (
1845 FIL *fp /* Pointer to the file object */
1846 )
1847 {
1848 FRESULT res;
1849 DWORD tim;
1850 BYTE *dir;
1851
1852
1853 res = validate(fp->fs, fp->id); /* Check validity of the object */
1854 if (res == FR_OK) {
1855 if (fp->flag & FA__WRITTEN) { /* Has the file been written? */
1856 #if !_FS_TINY /* Write-back dirty buffer */
1857 if (fp->flag & FA__DIRTY) {
1858 if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK)
1859 LEAVE_FF(fp->fs, FR_DISK_ERR);
1860 fp->flag &= (BYTE)~FA__DIRTY;
1861 }
1862 #endif
1863 /* Update the directory entry */
1864 res = move_window(fp->fs, fp->dir_sect);
1865 if (res == FR_OK) {
1866 dir = fp->dir_ptr;
1867 dir[DIR_Attr] |= AM_ARC; /* Set archive bit */
1868 ST_DWORD(dir+DIR_FileSize, fp->fsize); /* Update file size */
1869 ST_WORD(dir+DIR_FstClusLO, fp->org_clust); /* Update start cluster */
1870 ST_WORD(dir+DIR_FstClusHI, fp->org_clust >> 16);
1871 tim = get_fattime(); /* Updated time */
1872 ST_DWORD(dir+DIR_WrtTime, tim);
1873 fp->flag &= (BYTE)~FA__WRITTEN;
1874 fp->fs->wflag = 1;
1875 res = sync(fp->fs);
1876 }
1877 }
1878 }
1879
1880 LEAVE_FF(fp->fs, res);
1881 }
1882
1883 #endif /* !_FS_READONLY */
1884
1885
1886
1887
1888 /*-----------------------------------------------------------------------*/
1889 /* Close File */
1890 /*-----------------------------------------------------------------------*/
1891
1892 FRESULT f_close (
1893 FIL *fp /* Pointer to the file object to be closed */
1894 )
1895 {
1896 FRESULT res;
1897
1898
1899 #if _FS_READONLY
1900 res = validate(fp->fs, fp->id);
1901 if (res == FR_OK) fp->fs = NULL;
1902 LEAVE_FF(fp->fs, res);
1903 #else
1904 res = f_sync(fp);
1905 if (res == FR_OK) fp->fs = NULL;
1906 return res;
1907 #endif
1908 }
1909
1910
1911
1912
1913 #if _FS_MINIMIZE <= 2
1914 /*-----------------------------------------------------------------------*/
1915 /* Seek File R/W Pointer */
1916 /*-----------------------------------------------------------------------*/
1917
1918 FRESULT f_lseek (
1919 FIL *fp, /* Pointer to the file object */
1920 DWORD ofs /* File pointer from top of file */
1921 )
1922 {
1923 FRESULT res;
1924 DWORD clst, bcs, nsect, ifptr;
1925
1926
1927 res = validate(fp->fs, fp->id); /* Check validity of the object */
1928 if (res != FR_OK) LEAVE_FF(fp->fs, res);
1929 if (fp->flag & FA__ERROR) /* Check abort flag */
1930 LEAVE_FF(fp->fs, FR_INT_ERR);
1931 if (ofs > fp->fsize /* In read-only mode, clip offset with the file size */
1932 #if !_FS_READONLY
1933 && !(fp->flag & FA_WRITE)
1934 #endif
1935 ) ofs = fp->fsize;
1936
1937 ifptr = fp->fptr;
1938 fp->fptr = 0; fp->csect = 255;
1939 nsect = 0;
1940 if (ofs > 0) {
1941 bcs = (DWORD)fp->fs->csize * SS(fp->fs); /* Cluster size (byte) */
1942 if (ifptr > 0 &&
1943 (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
1944 fp->fptr = (ifptr - 1) & ~(bcs - 1); /* start from the current cluster */
1945 ofs -= fp->fptr;
1946 clst = fp->curr_clust;
1947 } else { /* When seek to back cluster, */
1948 clst = fp->org_clust; /* start from the first cluster */
1949 #if !_FS_READONLY
1950 if (clst == 0) { /* If no cluster chain, create a new chain */
1951 clst = create_chain(fp->fs, 0);
1952 if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
1953 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
1954 fp->org_clust = clst;
1955 }
1956 #endif
1957 fp->curr_clust = clst;
1958 }
1959 if (clst != 0) {
1960 while (ofs > bcs) { /* Cluster following loop */
1961 #if !_FS_READONLY
1962 if (fp->flag & FA_WRITE) { /* Check if in write mode or not */
1963 clst = create_chain(fp->fs, clst); /* Force streached if in write mode */
1964 if (clst == 0) { /* When disk gets full, clip file size */
1965 ofs = bcs; break;
1966 }
1967 } else
1968 #endif
1969 clst = get_cluster(fp->fs, clst); /* Follow cluster chain if not in write mode */
1970 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
1971 if (clst <= 1 || clst >= fp->fs->max_clust) ABORT(fp->fs, FR_INT_ERR);
1972 fp->curr_clust = clst;
1973 fp->fptr += bcs;
1974 ofs -= bcs;
1975 }
1976 fp->fptr += ofs;
1977 fp->csect = (BYTE)(ofs / SS(fp->fs)); /* Sector offset in the cluster */
1978 if (ofs % SS(fp->fs)) {
1979 nsect = clust2sect(fp->fs, clst); /* Current sector */
1980 if (!nsect) ABORT(fp->fs, FR_INT_ERR);
1981 nsect += fp->csect;
1982 fp->csect++;
1983 }
1984 }
1985 }
1986 if (nsect && nsect != fp->dsect && fp->fptr % SS(fp->fs)) {
1987 #if !_FS_TINY
1988 #if !_FS_READONLY
1989 if (fp->flag & FA__DIRTY) { /* Write-back dirty buffer if needed */
1990 if (disk_write(fp->fs->drive, fp->buf, fp->dsect, 1) != RES_OK)
1991 ABORT(fp->fs, FR_DISK_ERR);
1992 fp->flag &= (BYTE)~FA__DIRTY;
1993 }
1994 #endif
1995 if (disk_read(fp->fs->drive, fp->buf, nsect, 1) != RES_OK)
1996 ABORT(fp->fs, FR_DISK_ERR);
1997 #endif
1998 fp->dsect = nsect;
1999 }
2000 #if !_FS_READONLY
2001 if (fp->fptr > fp->fsize) { /* Set changed flag if the file size is extended */
2002 fp->fsize = fp->fptr;
2003 fp->flag |= FA__WRITTEN;
2004 }
2005 #endif
2006
2007 LEAVE_FF(fp->fs, res);
2008 }
2009
2010
2011
2012
2013 #if _FS_MINIMIZE <= 1
2014 /*-----------------------------------------------------------------------*/
2015 /* Create a Directroy Object */
2016 /*-----------------------------------------------------------------------*/
2017
2018 FRESULT f_opendir (
2019 DIR *dj, /* Pointer to directory object to create */
2020 const char *path /* Pointer to the directory path */
2021 )
2022 {
2023 FRESULT res;
2024 NAMEBUF(sfn, lfn);
2025 BYTE *dir;
2026
2027
2028 res = auto_mount(&path, &dj->fs, 0);
2029 if (res == FR_OK) {
2030 INITBUF((*dj), sfn, lfn);
2031 res = follow_path(dj, path); /* Follow the path to the directory */
2032 if (res == FR_OK) { /* Follow completed */
2033 dir = dj->dir;
2034 if (dir) { /* It is not the root dir */
2035 if (dir[DIR_Attr] & AM_DIR) { /* The object is a directory */
2036 dj->sclust = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO);
2037 } else { /* The object is not a directory */
2038 res = FR_NO_PATH;
2039 }
2040 } else { /* It is the root dir */
2041 dj->sclust = (dj->fs->fs_type == FS_FAT32) ? dj->fs->dirbase : 0;
2042 }
2043 if (res == FR_OK) res = dir_seek(dj, 0);
2044 dj->id = dj->fs->id;
2045 } else {
2046 if (res == FR_NO_FILE) res = FR_NO_PATH;
2047 }
2048 }
2049
2050 LEAVE_FF(dj->fs, res);
2051 }
2052
2053
2054
2055
2056 /*-----------------------------------------------------------------------*/
2057 /* Read Directory Entry in Sequense */
2058 /*-----------------------------------------------------------------------*/
2059
2060 FRESULT f_readdir (
2061 DIR *dj, /* Pointer to the open directory object */
2062 FILINFO *fno /* Pointer to file information to return */
2063 )
2064 {
2065 FRESULT res;
2066 NAMEBUF(sfn, lfn);
2067
2068
2069 res = validate(dj->fs, dj->id); /* Check validity of the object */
2070 if (res == FR_OK) {
2071 INITBUF((*dj), sfn, lfn);
2072 if (!fno) {
2073 res = dir_seek(dj, 0);
2074 } else {
2075 res = dir_read(dj);
2076 if (res == FR_NO_FILE) {
2077 dj->sect = 0;
2078 res = FR_OK;
2079 }
2080 if (res == FR_OK) { /* A valid entry is found */
2081 get_fileinfo(dj, fno); /* Get the object information */
2082 res = dir_next(dj, FALSE); /* Increment index for next */
2083 if (res == FR_NO_FILE) {
2084 dj->sect = 0;
2085 res = FR_OK;
2086 }
2087 }
2088 }
2089 }
2090
2091 LEAVE_FF(dj->fs, res);
2092 }
2093
2094
2095
2096 #if _FS_MINIMIZE == 0
2097 /*-----------------------------------------------------------------------*/
2098 /* Get File Status */
2099 /*-----------------------------------------------------------------------*/
2100
2101 FRESULT f_stat (
2102 const char *path, /* Pointer to the file path */
2103 FILINFO *fno /* Pointer to file information to return */
2104 )
2105 {
2106 FRESULT res;
2107 DIR dj;
2108 NAMEBUF(sfn, lfn);
2109
2110
2111 res = auto_mount(&path, &dj.fs, 0);
2112 if (res == FR_OK) {
2113 INITBUF(dj, sfn, lfn);
2114 res = follow_path(&dj, path); /* Follow the file path */
2115 if (res == FR_OK) { /* Follwo completed */
2116 if (dj.dir) /* Found an object */
2117 get_fileinfo(&dj, fno);
2118 else /* It is root dir */
2119 res = FR_INVALID_NAME;
2120 }
2121 }
2122
2123 LEAVE_FF(dj.fs, res);
2124 }
2125
2126
2127
2128 #if !_FS_READONLY
2129 /*-----------------------------------------------------------------------*/
2130 /* Truncate File */
2131 /*-----------------------------------------------------------------------*/
2132
2133 FRESULT f_truncate (
2134 FIL *fp /* Pointer to the file object */
2135 )
2136 {
2137 FRESULT res;
2138 DWORD ncl;
2139
2140
2141 res = validate(fp->fs, fp->id); /* Check validity of the object */
2142 if (res != FR_OK) LEAVE_FF(fp->fs, res);
2143 if (fp->flag & FA__ERROR) /* Check abort flag */
2144 LEAVE_FF(fp->fs, FR_INT_ERR);
2145 if (!(fp->flag & FA_WRITE)) /* Check access mode */
2146 LEAVE_FF(fp->fs, FR_DENIED);
2147
2148 if (fp->fsize > fp->fptr) {
2149 fp->fsize = fp->fptr; /* Set file size to current R/W point */
2150 fp->flag |= FA__WRITTEN;
2151 if (fp->fptr == 0) { /* When set file size to zero, remove entire cluster chain */
2152 res = remove_chain(fp->fs, fp->org_clust);
2153 fp->org_clust = 0;
2154 } else { /* When truncate a part of the file, remove remaining clusters */
2155 ncl = get_cluster(fp->fs, fp->curr_clust);
2156 res = FR_OK;
2157 if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
2158 if (ncl == 1) res = FR_INT_ERR;
2159 if (res == FR_OK && ncl < fp->fs->max_clust) {
2160 res = put_cluster(fp->fs, fp->curr_clust, 0x0FFFFFFF);
2161 if (res == FR_OK) res = remove_chain(fp->fs, ncl);
2162 }
2163 }
2164 }
2165 if (res != FR_OK) fp->flag |= FA__ERROR;
2166
2167 LEAVE_FF(fp->fs, res);
2168 }
2169
2170
2171
2172
2173 /*-----------------------------------------------------------------------*/
2174 /* Get Number of Free Clusters */
2175 /*-----------------------------------------------------------------------*/
2176
2177 FRESULT f_getfree (
2178 const char *path, /* Pointer to the logical drive number (root dir) */
2179 DWORD *nclst, /* Pointer to the variable to return number of free clusters */
2180 FATFS **fatfs /* Pointer to pointer to corresponding file system object to return */
2181 )
2182 {
2183 FRESULT res;
2184 DWORD n, clst, sect;
2185 BYTE fat, f, *p;
2186
2187
2188 /* Get drive number */
2189 res = auto_mount(&path, fatfs, 0);
2190 if (res != FR_OK) LEAVE_FF(*fatfs, res);
2191
2192 /* If number of free cluster is valid, return it without cluster scan. */
2193 if ((*fatfs)->free_clust <= (*fatfs)->max_clust - 2) {
2194 *nclst = (*fatfs)->free_clust;
2195 LEAVE_FF(*fatfs, FR_OK);
2196 }
2197
2198 /* Get number of free clusters */
2199 fat = (*fatfs)->fs_type;
2200 n = 0;
2201 if (fat == FS_FAT12) {
2202 clst = 2;
2203 do {
2204 if ((WORD)get_cluster(*fatfs, clst) == 0) n++;
2205 } while (++clst < (*fatfs)->max_clust);
2206 } else {
2207 clst = (*fatfs)->max_clust;
2208 sect = (*fatfs)->fatbase;
2209 f = 0; p = 0;
2210 do {
2211 if (!f) {
2212 res = move_window(*fatfs, sect++);
2213 if (res != FR_OK)
2214 LEAVE_FF(*fatfs, res);
2215 p = (*fatfs)->win;
2216 }
2217 if (fat == FS_FAT16) {
2218 if (LD_WORD(p) == 0) n++;
2219 p += 2; f += 1;
2220 } else {
2221 if (LD_DWORD(p) == 0) n++;
2222 p += 4; f += 2;
2223 }
2224 } while (--clst);
2225 }
2226 (*fatfs)->free_clust = n;
2227 if (fat == FS_FAT32) (*fatfs)->fsi_flag = 1;
2228 *nclst = n;
2229
2230 LEAVE_FF(*fatfs, FR_OK);
2231 }
2232
2233
2234
2235
2236 /*-----------------------------------------------------------------------*/
2237 /* Delete a File or Directory */
2238 /*-----------------------------------------------------------------------*/
2239
2240 FRESULT f_unlink (
2241 const char *path /* Pointer to the file or directory path */
2242 )
2243 {
2244 FRESULT res;
2245 DIR dj, sdj;
2246 NAMEBUF(sfn, lfn);
2247 BYTE *dir;
2248 DWORD dclst;
2249
2250
2251 res = auto_mount(&path, &dj.fs, 1);
2252 if (res != FR_OK) LEAVE_FF(dj.fs, res);
2253
2254 INITBUF(dj, sfn, lfn);
2255 res = follow_path(&dj, path); /* Follow the file path */
2256 if (res != FR_OK) LEAVE_FF(dj.fs, res); /* Follow failed */
2257
2258 dir = dj.dir;
2259 if (!dir) /* Is it the root directory? */
2260 LEAVE_FF(dj.fs, FR_INVALID_NAME);
2261 if (dir[DIR_Attr] & AM_RDO) /* Is it a R/O object? */
2262 LEAVE_FF(dj.fs, FR_DENIED);
2263 dclst = ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) | LD_WORD(dir+DIR_FstClusLO);
2264
2265 if (dir[DIR_Attr] & AM_DIR) { /* It is a sub-directory */
2266 if (dclst < 2) LEAVE_FF(dj.fs, FR_INT_ERR);
2267 mem_cpy(&sdj, &dj, sizeof(DIR)); /* Check if the sub-dir is empty or not */
2268 sdj.sclust = dclst;
2269 res = dir_seek(&sdj, 0);
2270 if (res != FR_OK) LEAVE_FF(dj.fs, res);
2271 res = dir_read(&sdj);
2272 if (res == FR_OK) res = FR_DENIED; /* Not empty sub-dir */
2273 if (res != FR_NO_FILE) LEAVE_FF(dj.fs, res);
2274 }
2275
2276 res = dir_remove(&dj); /* Remove directory entry */
2277 if (res == FR_OK) {
2278 if (dclst)
2279 res = remove_chain(dj.fs, dclst); /* Remove the cluster chain */
2280 if (res == FR_OK) res = sync(dj.fs);
2281 }
2282
2283 LEAVE_FF(dj.fs, res);
2284 }
2285
2286
2287
2288
2289 /*-----------------------------------------------------------------------*/
2290 /* Create a Directory */
2291 /*-----------------------------------------------------------------------*/
2292
2293 FRESULT f_mkdir (
2294 const char *path /* Pointer to the directory path */
2295 )
2296 {
2297 FRESULT res;
2298 DIR dj;
2299 NAMEBUF(sfn, lfn);
2300 BYTE *dir, n;
2301 DWORD dsect, dclst, pclst, tim;
2302
2303
2304 res = auto_mount(&path, &dj.fs, 1);
2305 if (res != FR_OK) LEAVE_FF(dj.fs, res);
2306
2307 INITBUF(dj, sfn, lfn);
2308 res = follow_path(&dj, path); /* Follow the file path */
2309 if (res == FR_OK) res = FR_EXIST; /* Any file or directory is already existing */
2310 if (res != FR_NO_FILE) /* Any error occured */
2311 LEAVE_FF(dj.fs, res);
2312
2313 dclst = create_chain(dj.fs, 0); /* Allocate a new cluster for new directory table */
2314 res = FR_OK;
2315 if (dclst == 0) res = FR_DENIED;
2316 if (dclst == 1) res = FR_INT_ERR;
2317 if (dclst == 0xFFFFFFFF) res = FR_DISK_ERR;
2318 if (res == FR_OK)
2319 res = move_window(dj.fs, 0);
2320 if (res != FR_OK) LEAVE_FF(dj.fs, res);
2321 dsect = clust2sect(dj.fs, dclst);
2322
2323 dir = dj.fs->win; /* Initialize the new directory table */
2324 mem_set(dir, 0, SS(dj.fs));
2325 mem_set(dir+DIR_Name, ' ', 8+3); /* Create "." entry */
2326 dir[DIR_Name] = '.';
2327 dir[DIR_Attr] = AM_DIR;
2328 tim = get_fattime();
2329 ST_DWORD(dir+DIR_WrtTime, tim);
2330 ST_WORD(dir+DIR_FstClusLO, dclst);
2331 ST_WORD(dir+DIR_FstClusHI, dclst >> 16);
2332 mem_cpy(dir+32, dir, 32); /* Create ".." entry */
2333 dir[33] = '.';
2334 pclst = dj.sclust;
2335 if (dj.fs->fs_type == FS_FAT32 && pclst == dj.fs->dirbase)
2336 pclst = 0;
2337 ST_WORD(dir+32+DIR_FstClusLO, pclst);
2338 ST_WORD(dir+32+DIR_FstClusHI, pclst >> 16);
2339 for (n = 0; n < dj.fs->csize; n++) { /* Write dot entries and clear left sectors */
2340 dj.fs->winsect = dsect++;
2341 dj.fs->wflag = 1;
2342 res = move_window(dj.fs, 0);
2343 if (res) LEAVE_FF(dj.fs, res);
2344 mem_set(dir, 0, SS(dj.fs));
2345 }
2346
2347 res = dir_register(&dj);
2348 if (res != FR_OK) {
2349 remove_chain(dj.fs, dclst);
2350 } else {
2351 dir = dj.dir;
2352 dir[DIR_Attr] = AM_DIR; /* Attribute */
2353 ST_DWORD(dir+DIR_WrtTime, tim); /* Crated time */
2354 ST_WORD(dir+DIR_FstClusLO, dclst); /* Table start cluster */
2355 ST_WORD(dir+DIR_FstClusHI, dclst >> 16);
2356 dj.fs->wflag = 1;
2357 res = sync(dj.fs);
2358 }
2359
2360 LEAVE_FF(dj.fs, res);
2361 }
2362
2363
2364
2365
2366 /*-----------------------------------------------------------------------*/
2367 /* Change File Attribute */
2368 /*-----------------------------------------------------------------------*/
2369
2370 FRESULT f_chmod (
2371 const char *path, /* Pointer to the file path */
2372 BYTE value, /* Attribute bits */
2373 BYTE mask /* Attribute mask to change */
2374 )
2375 {
2376 FRESULT res;
2377 DIR dj;
2378 NAMEBUF(sfn, lfn);
2379 BYTE *dir;
2380
2381
2382 res = auto_mount(&path, &dj.fs, 1);
2383 if (res == FR_OK) {
2384 INITBUF(dj, sfn, lfn);
2385 res = follow_path(&dj, path); /* Follow the file path */
2386 if (res == FR_OK) {
2387 dir = dj.dir;
2388 if (!dir) { /* Is it a root directory? */
2389 res = FR_INVALID_NAME;
2390 } else { /* File or sub directory */
2391 mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC; /* Valid attribute mask */
2392 dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask); /* Apply attribute change */
2393 dj.fs->wflag = 1;
2394 res = sync(dj.fs);
2395 }
2396 }
2397 }
2398
2399 LEAVE_FF(dj.fs, res);
2400 }
2401
2402
2403
2404
2405 /*-----------------------------------------------------------------------*/
2406 /* Change Timestamp */
2407 /*-----------------------------------------------------------------------*/
2408
2409 FRESULT f_utime (
2410 const char *path, /* Pointer to the file/directory name */
2411 const FILINFO *fno /* Pointer to the timestamp to be set */
2412 )
2413 {
2414 FRESULT res;
2415 DIR dj;
2416 NAMEBUF(sfn, lfn);
2417 BYTE *dir;
2418
2419
2420 res = auto_mount(&path, &dj.fs, 1);
2421 if (res == FR_OK) {
2422 INITBUF(dj, sfn, lfn);
2423 res = follow_path(&dj, path); /* Follow the file path */
2424 if (res == FR_OK) {
2425 dir = dj.dir;
2426 if (!dir) { /* Root directory */
2427 res = FR_INVALID_NAME;
2428 } else { /* File or sub-directory */
2429 ST_WORD(dir+DIR_WrtTime, fno->ftime);
2430 ST_WORD(dir+DIR_WrtDate, fno->fdate);
2431 dj.fs->wflag = 1;
2432 res = sync(dj.fs);
2433 }
2434 }
2435 }
2436
2437 LEAVE_FF(dj.fs, res);
2438 }
2439
2440
2441
2442
2443 /*-----------------------------------------------------------------------*/
2444 /* Rename File/Directory */
2445 /*-----------------------------------------------------------------------*/
2446
2447 FRESULT f_rename (
2448 const char *path_old, /* Pointer to the old name */
2449 const char *path_new /* Pointer to the new name */
2450 )
2451 {
2452 FRESULT res;
2453 DIR dj_old, dj_new;
2454 NAMEBUF(sfn, lfn);
2455 BYTE buf[21], *dir;
2456 DWORD dw;
2457
2458
2459 INITBUF(dj_old, sfn, lfn);
2460 res = auto_mount(&path_old, &dj_old.fs, 1);
2461 if (res == FR_OK) {
2462 dj_new.fs = dj_old.fs;
2463 res = follow_path(&dj_old, path_old); /* Check old object */
2464 }
2465 if (res != FR_OK) LEAVE_FF(dj_old.fs, res); /* The old object is not found */
2466
2467 if (!dj_old.dir) LEAVE_FF(dj_old.fs, FR_NO_FILE); /* Is root dir? */
2468 mem_cpy(buf, dj_old.dir+DIR_Attr, 21); /* Save the object information */
2469
2470 mem_cpy(&dj_new, &dj_old, sizeof(DIR));
2471 res = follow_path(&dj_new, path_new); /* Check new object */
2472 if (res == FR_OK) res = FR_EXIST; /* The new object name is already existing */
2473 if (res == FR_NO_FILE) { /* Is it a valid path and no name collision? */
2474 res = dir_register(&dj_new); /* Register the new object */
2475 if (res == FR_OK) {
2476 dir = dj_new.dir; /* Copy object information into new entry */
2477 mem_cpy(dir+13, buf+2, 19);
2478 dir[DIR_Attr] = buf[0];
2479 dj_old.fs->wflag = 1;
2480 if (dir[DIR_Attr] & AM_DIR) { /* Update .. entry in the directory if needed */
2481 dw = clust2sect(dj_new.fs, (DWORD)LD_WORD(dir+DIR_FstClusHI) | LD_WORD(dir+DIR_FstClusLO));
2482 if (!dw) {
2483 res = FR_INT_ERR;
2484 } else {
2485 res = move_window(dj_new.fs, dw);
2486 dir = dj_new.fs->win+32;
2487 if (res == FR_OK && dir[1] == '.') {
2488 dw = (dj_new.fs->fs_type == FS_FAT32 && dj_new.sclust == dj_new.fs->dirbase) ? 0 : dj_new.sclust;
2489 ST_WORD(dir+DIR_FstClusLO, dw);
2490 ST_WORD(dir+DIR_FstClusHI, dw >> 16);
2491 dj_new.fs->wflag = 1;
2492 }
2493 }
2494 }
2495 if (res == FR_OK) {
2496 res = dir_remove(&dj_old); /* Remove old entry */
2497 if (res == FR_OK)
2498 res = sync(dj_old.fs);
2499 }
2500 }
2501 }
2502
2503 LEAVE_FF(dj_old.fs, res);
2504 }
2505
2506 #endif /* !_FS_READONLY */
2507 #endif /* _FS_MINIMIZE == 0 */
2508 #endif /* _FS_MINIMIZE <= 1 */
2509 #endif /* _FS_MINIMIZE <= 2 */
2510
2511
2512
2513 /*-----------------------------------------------------------------------*/
2514 /* Forward data to the stream directly (Available on only _FS_TINY cfg) */
2515 /*-----------------------------------------------------------------------*/
2516 #if _USE_FORWARD && _FS_TINY
2517
2518 FRESULT f_forward (
2519 FIL *fp, /* Pointer to the file object */
2520 UINT (*func)(const BYTE*,UINT), /* Pointer to the streaming function */
2521 UINT btr, /* Number of bytes to forward */
2522 UINT *bf /* Pointer to number of bytes forwarded */
2523 )
2524 {
2525 FRESULT res;
2526 DWORD remain, clst, sect;
2527 UINT rcnt;
2528
2529
2530 *bf = 0;
2531
2532 res = validate(fp->fs, fp->id); /* Check validity of the object */
2533 if (res != FR_OK) LEAVE_FF(fp->fs, res);
2534 if (fp->flag & FA__ERROR) /* Check error flag */
2535 LEAVE_FF(fp->fs, FR_INT_ERR);
2536 if (!(fp->flag & FA_READ)) /* Check access mode */
2537 LEAVE_FF(fp->fs, FR_DENIED);
2538
2539 remain = fp->fsize - fp->fptr;
2540 if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */
2541
2542 for ( ; btr && (*func)(NULL, 0); /* Repeat until all data transferred or stream becomes busy */
2543 fp->fptr += rcnt, *bf += rcnt, btr -= rcnt) {
2544 if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
2545 if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */
2546 clst = (fp->fptr == 0) ? /* On the top of the file? */
2547 fp->org_clust : get_cluster(fp->fs, fp->curr_clust);
2548 if (clst <= 1) ABORT(fp->fs, FR_INT_ERR);
2549 if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
2550 fp->curr_clust = clst; /* Update current cluster */
2551 fp->csect = 0; /* Reset sector address in the cluster */
2552 }
2553 fp->csect++; /* Next sector address in the cluster */
2554 }
2555 sect = clust2sect(fp->fs, fp->curr_clust); /* Get current data sector */
2556 if (!sect) ABORT(fp->fs, FR_INT_ERR);
2557 sect += fp->csect - 1;
2558 if (move_window(fp->fs, sect)) /* Move sector window */
2559 ABORT(fp->fs, FR_DISK_ERR);
2560 fp->dsect = sect;
2561 rcnt = SS(fp->fs) - (WORD)(fp->fptr % SS(fp->fs)); /* Forward data from sector window */
2562 if (rcnt > btr) rcnt = btr;
2563 rcnt = (*func)(&fp->fs->win[(WORD)fp->fptr % SS(fp->fs)], rcnt);
2564 if (!rcnt) ABORT(fp->fs, FR_INT_ERR);
2565 }
2566
2567 LEAVE_FF(fp->fs, FR_OK);
2568 }
2569 #endif /* _USE_FORWARD */
2570
2571
2572
2573 #if _USE_MKFS && !_FS_READONLY
2574 /*-----------------------------------------------------------------------*/
2575 /* Create File System on the Drive */
2576 /*-----------------------------------------------------------------------*/
2577 #define N_ROOTDIR 512 /* Multiple of 32 and <= 2048 */
2578 #define N_FATS 1 /* 1 or 2 */
2579 #define MAX_SECTOR 131072000UL /* Maximum partition size */
2580 #define MIN_SECTOR 2000UL /* Minimum partition size */
2581
2582
2583 FRESULT f_mkfs (
2584 BYTE drv, /* Logical drive number */
2585 BYTE partition, /* Partitioning rule 0:FDISK, 1:SFD */
2586 WORD allocsize /* Allocation unit size [bytes] */
2587 )
2588 {
2589 static const DWORD sstbl[] = { 2048000, 1024000, 512000, 256000, 128000, 64000, 32000, 16000, 8000, 4000, 0 };
2590 static const WORD cstbl[] = { 32768, 16384, 8192, 4096, 2048, 16384, 8192, 4096, 2048, 1024, 512 };
2591 BYTE fmt, m, *tbl;
2592 DWORD b_part, b_fat, b_dir, b_data; /* Area offset (LBA) */
2593 DWORD n_part, n_rsv, n_fat, n_dir; /* Area size */
2594 DWORD n_clst, n;
2595 WORD as;
2596 FATFS *fs;
2597 DSTATUS stat;
2598
2599
2600 /* Check validity of the parameters */
2601 if (drv >= _DRIVES) return FR_INVALID_DRIVE;
2602 if (partition >= 2) return FR_MKFS_ABORTED;
2603
2604 /* Check mounted drive and clear work area */
2605 fs = FatFs[drv];
2606 if (!fs) return FR_NOT_ENABLED;
2607 fs->fs_type = 0;
2608 drv = LD2PD(drv);
2609
2610 /* Get disk statics */
2611 stat = disk_initialize(drv);
2612 if (stat & STA_NOINIT) return FR_NOT_READY;
2613 if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
2614 if (disk_ioctl(drv, GET_SECTOR_COUNT, &n_part) != RES_OK || n_part < MIN_SECTOR)
2615 return FR_MKFS_ABORTED;
2616 if (n_part > MAX_SECTOR) n_part = MAX_SECTOR;
2617 b_part = (!partition) ? 63 : 0; /* Boot sector */
2618 n_part -= b_part;
2619 #if _MAX_SS == 512
2620 if (!allocsize) { /* Auto selection of cluster size */
2621 for (n = 0; n_part < sstbl[n]; n++) ;
2622 allocsize = cstbl[n];
2623 }
2624 #endif
2625 for (as = 512; as <= 32768U && as != allocsize; as <<= 1);
2626 if (as != allocsize) return FR_MKFS_ABORTED;
2627 #if _MAX_SS != 512 /* Check disk sector size */
2628 if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK
2629 || SS(fs) > _MAX_SS
2630 || SS(fs) > allocsize)
2631 return FR_MKFS_ABORTED;
2632 #endif
2633 allocsize /= SS(fs); /* Number of sectors per cluster */
2634
2635 /* Pre-compute number of clusters and FAT type */
2636 n_clst = n_part / allocsize;
2637 fmt = FS_FAT12;
2638 if (n_clst >= 0xFF5) fmt = FS_FAT16;
2639 if (n_clst >= 0xFFF5) fmt = FS_FAT32;
2640
2641 /* Determine offset and size of FAT structure */
2642 switch (fmt) {
2643 case FS_FAT12:
2644 n_fat = ((n_clst * 3 + 1) / 2 + 3 + SS(fs) - 1) / SS(fs);
2645 n_rsv = 1 + partition;
2646 n_dir = N_ROOTDIR * 32 / SS(fs);
2647 break;
2648 case FS_FAT16:
2649 n_fat = ((n_clst * 2) + 4 + SS(fs) - 1) / SS(fs);
2650 n_rsv = 1 + partition;
2651 n_dir = N_ROOTDIR * 32 / SS(fs);
2652 break;
2653 default:
2654 n_fat = ((n_clst * 4) + 8 + SS(fs) - 1) / SS(fs);
2655 n_rsv = 33 - partition;
2656 n_dir = 0;
2657 }
2658 b_fat = b_part + n_rsv; /* FATs start sector */
2659 b_dir = b_fat + n_fat * N_FATS; /* Directory start sector */
2660 b_data = b_dir + n_dir; /* Data start sector */
2661
2662 /* Align data start sector to erase block boundary (for flash memory media) */
2663 if (disk_ioctl(drv, GET_BLOCK_SIZE, &n) != RES_OK) return FR_MKFS_ABORTED;
2664 n = (b_data + n - 1) & ~(n - 1);
2665 n_fat += (n - b_data) / N_FATS;
2666 /* b_dir and b_data are no longer used below */
2667
2668 /* Determine number of cluster and final check of validity of the FAT type */
2669 n_clst = (n_part - n_rsv - n_fat * N_FATS - n_dir) / allocsize;
2670 if ( (fmt == FS_FAT16 && n_clst < 0xFF5)
2671 || (fmt == FS_FAT32 && n_clst < 0xFFF5))
2672 return FR_MKFS_ABORTED;
2673
2674 /* Create partition table if needed */
2675 if (!partition) {
2676 DWORD n_disk = b_part + n_part;
2677
2678 tbl = fs->win+MBR_Table;
2679 ST_DWORD(tbl, 0x00010180); /* Partition start in CHS */
2680 if (n_disk < 63UL * 255 * 1024) { /* Partition end in CHS */
2681 n_disk = n_disk / 63 / 255;
2682 tbl[7] = (BYTE)n_disk;
2683 tbl[6] = (BYTE)((n_disk >> 2) | 63);
2684 } else {
2685 ST_WORD(&tbl[6], 0xFFFF);
2686 }
2687 tbl[5] = 254;
2688 if (fmt != FS_FAT32) /* System ID */
2689 tbl[4] = (n_part < 0x10000) ? 0x04 : 0x06;
2690 else
2691 tbl[4] = 0x0c;
2692 ST_DWORD(tbl+8, 63); /* Partition start in LBA */
2693 ST_DWORD(tbl+12, n_part); /* Partition size in LBA */
2694 ST_WORD(tbl+64, 0xAA55); /* Signature */
2695 if (disk_write(drv, fs->win, 0, 1) != RES_OK)
2696 return FR_DISK_ERR;
2697 }
2698
2699 /* Create boot record */
2700 tbl = fs->win; /* Clear buffer */
2701 mem_set(tbl, 0, SS(fs));
2702 ST_DWORD(tbl+BS_jmpBoot, 0x90FEEB); /* Boot code (jmp $, nop) */
2703 ST_WORD(tbl+BPB_BytsPerSec, SS(fs)); /* Sector size */
2704 tbl[BPB_SecPerClus] = (BYTE)allocsize; /* Sectors per cluster */
2705 ST_WORD(tbl+BPB_RsvdSecCnt, n_rsv); /* Reserved sectors */
2706 tbl[BPB_NumFATs] = N_FATS; /* Number of FATs */
2707 ST_WORD(tbl+BPB_RootEntCnt, SS(fs) / 32 * n_dir); /* Number of rootdir entries */
2708 if (n_part < 0x10000) { /* Number of total sectors */
2709 ST_WORD(tbl+BPB_TotSec16, n_part);
2710 } else {
2711 ST_DWORD(tbl+BPB_TotSec32, n_part);
2712 }
2713 tbl[BPB_Media] = 0xF8; /* Media descripter */
2714 ST_WORD(tbl+BPB_SecPerTrk, 63); /* Number of sectors per track */
2715 ST_WORD(tbl+BPB_NumHeads, 255); /* Number of heads */
2716 ST_DWORD(tbl+BPB_HiddSec, b_part); /* Hidden sectors */
2717 n = get_fattime(); /* Use current time as a VSN */
2718 if (fmt != FS_FAT32) {
2719 ST_DWORD(tbl+BS_VolID, n); /* Volume serial number */
2720 ST_WORD(tbl+BPB_FATSz16, n_fat); /* Number of secters per FAT */
2721 tbl[BS_DrvNum] = 0x80; /* Drive number */
2722 tbl[BS_BootSig] = 0x29; /* Extended boot signature */
2723 mem_cpy(tbl+BS_VolLab, "NO NAME FAT ", 19); /* Volume lavel, FAT signature */
2724 } else {
2725 ST_DWORD(tbl+BS_VolID32, n); /* Volume serial number */
2726 ST_DWORD(tbl+BPB_FATSz32, n_fat); /* Number of secters per FAT */
2727 ST_DWORD(tbl+BPB_RootClus, 2); /* Root directory cluster (2) */
2728 ST_WORD(tbl+BPB_FSInfo, 1); /* FSInfo record offset (bs+1) */
2729 ST_WORD(tbl+BPB_BkBootSec, 6); /* Backup boot record offset (bs+6) */
2730 tbl[BS_DrvNum32] = 0x80; /* Drive number */
2731 tbl[BS_BootSig32] = 0x29; /* Extended boot signature */
2732 mem_cpy(tbl+BS_VolLab32, "NO NAME FAT32 ", 19); /* Volume lavel, FAT signature */
2733 }
2734 ST_WORD(tbl+BS_55AA, 0xAA55); /* Signature */
2735 if (disk_write(drv, tbl, b_part+0, 1) != RES_OK)
2736 return FR_DISK_ERR;
2737 if (fmt == FS_FAT32)
2738 disk_write(drv, tbl, b_part+6, 1);
2739
2740 /* Initialize FAT area */
2741 for (m = 0; m < N_FATS; m++) {
2742 mem_set(tbl, 0, SS(fs)); /* 1st sector of the FAT */
2743 if (fmt != FS_FAT32) {
2744 n = (fmt == FS_FAT12) ? 0x00FFFFF8 : 0xFFFFFFF8;
2745 ST_DWORD(tbl, n); /* Reserve cluster #0-1 (FAT12/16) */
2746 } else {
2747 ST_DWORD(tbl+0, 0xFFFFFFF8); /* Reserve cluster #0-1 (FAT32) */
2748 ST_DWORD(tbl+4, 0xFFFFFFFF);
2749 ST_DWORD(tbl+8, 0x0FFFFFFF); /* Reserve cluster #2 for root dir */
2750 }
2751 if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)
2752 return FR_DISK_ERR;
2753 mem_set(tbl, 0, SS(fs)); /* Following FAT entries are filled by zero */
2754 for (n = 1; n < n_fat; n++) {
2755 if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)
2756 return FR_DISK_ERR;
2757 }
2758 }
2759
2760 /* Initialize Root directory */
2761 m = (BYTE)((fmt == FS_FAT32) ? allocsize : n_dir);
2762 do {
2763 if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)
2764 return FR_DISK_ERR;
2765 } while (--m);
2766
2767 /* Create FSInfo record if needed */
2768 if (fmt == FS_FAT32) {
2769 ST_WORD(tbl+BS_55AA, 0xAA55);
2770 ST_DWORD(tbl+FSI_LeadSig, 0x41615252);
2771 ST_DWORD(tbl+FSI_StrucSig, 0x61417272);
2772 ST_DWORD(tbl+FSI_Free_Count, n_clst - 1);
2773 ST_DWORD(tbl+FSI_Nxt_Free, 0xFFFFFFFF);
2774 disk_write(drv, tbl, b_part+1, 1);
2775 disk_write(drv, tbl, b_part+7, 1);
2776 }
2777
2778 return (disk_ioctl(drv, CTRL_SYNC, (void*)NULL) == RES_OK) ? FR_OK : FR_DISK_ERR;
2779 }
2780
2781 #endif /* _USE_MKFS && !_FS_READONLY */
2782
2783
2784
2785
2786 #if _USE_STRFUNC
2787 /*-----------------------------------------------------------------------*/
2788 /* Get a string from the file */
2789 /*-----------------------------------------------------------------------*/
2790 char* f_gets (
2791 char* buff, /* Pointer to the string buffer to read */
2792 int len, /* Size of string buffer */
2793 FIL* fil /* Pointer to the file object */
2794 )
2795 {
2796 int i = 0;
2797 char *p = buff;
2798 UINT rc;
2799
2800
2801 while (i < len - 1) { /* Read bytes until buffer gets filled */
2802 f_read(fil, p, 1, &rc);
2803 if (rc != 1) break; /* Break when no data to read */
2804 #if _USE_STRFUNC >= 2
2805 if (*p == '\r') continue; /* Strip '\r' */
2806 #endif
2807 i++;
2808 if (*p++ == '\n') break; /* Break when reached end of line */
2809 }
2810 *p = 0;
2811 return i ? buff : NULL; /* When no data read (eof or error), return with error. */
2812 }
2813
2814
2815
2816 #if !_FS_READONLY
2817 #include <stdarg.h>
2818 /*-----------------------------------------------------------------------*/
2819 /* Put a character to the file */
2820 /*-----------------------------------------------------------------------*/
2821 int f_putc (
2822 int chr, /* A character to be output */
2823 FIL* fil /* Ponter to the file object */
2824 )
2825 {
2826 UINT bw;
2827 char c;
2828
2829
2830 #if _USE_STRFUNC >= 2
2831 if (chr == '\n') f_putc ('\r', fil); /* LF -> CRLF conversion */
2832 #endif
2833 if (!fil) { /* Special value may be used to switch the destination to any other device */
2834 /* put_console(chr); */
2835 return chr;
2836 }
2837 c = (char)chr;
2838 f_write(fil, &c, 1, &bw); /* Write a byte to the file */
2839 return bw ? chr : EOF; /* Return the result */
2840 }
2841
2842
2843
2844
2845 /*-----------------------------------------------------------------------*/
2846 /* Put a string to the file */
2847 /*-----------------------------------------------------------------------*/
2848 int f_puts (
2849 const char* str, /* Pointer to the string to be output */
2850 FIL* fil /* Pointer to the file object */
2851 )
2852 {
2853 int n;
2854
2855
2856 for (n = 0; *str; str++, n++) {
2857 if (f_putc(*str, fil) == EOF) return EOF;
2858 }
2859 return n;
2860 }
2861
2862
2863
2864
2865 /*-----------------------------------------------------------------------*/
2866 /* Put a formatted string to the file */
2867 /*-----------------------------------------------------------------------*/
2868 int f_printf (
2869 FIL* fil, /* Pointer to the file object */
2870 const char* str, /* Pointer to the format string */
2871 ... /* Optional arguments... */
2872 )
2873 {
2874 va_list arp;
2875 UCHAR c, f, r;
2876 ULONG val;
2877 char s[16];
2878 int i, w, res, cc;
2879
2880
2881 va_start(arp, str);
2882
2883 for (cc = res = 0; cc != EOF; res += cc) {
2884 c = *str++;
2885 if (c == 0) break; /* End of string */
2886 if (c != '%') { /* Non escape cahracter */
2887 cc = f_putc(c, fil);
2888 if (cc != EOF) cc = 1;
2889 continue;
2890 }
2891 w = f = 0;
2892 c = *str++;
2893 if (c == '0') { /* Flag: '0' padding */
2894 f = 1; c = *str++;
2895 }
2896 while (c >= '0' && c <= '9') { /* Precision */
2897 w = w * 10 + (c - '0');
2898 c = *str++;
2899 }
2900 if (c == 'l') { /* Prefix: Size is long int */
2901 f |= 2; c = *str++;
2902 }
2903 if (c == 's') { /* Type is string */
2904 cc = f_puts(va_arg(arp, char*), fil);
2905 continue;
2906 }
2907 if (c == 'c') { /* Type is character */
2908 cc = f_putc(va_arg(arp, int), fil);
2909 if (cc != EOF) cc = 1;
2910 continue;
2911 }
2912 r = 0;
2913 if (c == 'd') r = 10; /* Type is signed decimal */
2914 if (c == 'u') r = 10; /* Type is unsigned decimal */
2915 if (c == 'X') r = 16; /* Type is unsigned hexdecimal */
2916 if (r == 0) break; /* Unknown type */
2917 if (f & 2) { /* Get the value */
2918 val = (ULONG)va_arg(arp, long);
2919 } else {
2920 val = (c == 'd') ? (ULONG)(long)va_arg(arp, int) : (ULONG)va_arg(arp, unsigned int);
2921 }
2922 /* Put numeral string */
2923 if (c == 'd') {
2924 if (val & 0x80000000) {
2925 val = 0 - val;
2926 f |= 4;
2927 }
2928 }
2929 i = sizeof(s) - 1; s[i] = 0;
2930 do {
2931 c = (UCHAR)(val % r + '0');
2932 if (c > '9') c += 7;
2933 s[--i] = c;
2934 val /= r;
2935 } while (i && val);
2936 if (i && (f & 4)) s[--i] = '-';
2937 w = sizeof(s) - 1 - w;
2938 while (i && i > w) s[--i] = (f & 1) ? '0' : ' ';
2939 cc = f_puts(&s[i], fil);
2940 }
2941
2942 va_end(arp);
2943 return (cc == EOF) ? cc : res;
2944 }
2945
2946 #endif /* !_FS_READONLY */
2947 #endif /* _USE_STRFUNC */
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