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[pub/USBasp.git] / Projects / Incomplete / StandaloneProgrammer / Lib / PetiteFATFs / pff.c
1 /*----------------------------------------------------------------------------/
2 / Petit FatFs - FAT file system module R0.01a (C)ChaN, 2010
3 /-----------------------------------------------------------------------------/
4 / Petit 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 terms.
7 /
8 / Copyright (C) 2010, ChaN, all right reserved.
9 /
10 / * The Petit 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 /-----------------------------------------------------------------------------/
16 / Jun 15,'09 R0.01a Branched from FatFs R0.07b
17 /----------------------------------------------------------------------------*/
18
19 #include "pff.h" /* Petit FatFs configurations and declarations */
20 #include "diskio.h" /* Declarations of low level disk I/O functions */
21
22
23 /*--------------------------------------------------------------------------
24
25 Private Work Area
26
27 ---------------------------------------------------------------------------*/
28
29 static
30 FATFS *FatFs; /* Pointer to the file system object (logical drive) */
31
32
33 /*--------------------------------------------------------------------------
34
35 Private Functions
36
37 ---------------------------------------------------------------------------*/
38
39
40 /*-----------------------------------------------------------------------*/
41 /* String functions */
42 /*-----------------------------------------------------------------------*/
43
44 /* Fill memory */
45 static
46 void mem_set (void* dst, int val, int cnt) {
47 char *d = (char*)dst;
48 while (cnt--) *d++ = (char)val;
49 }
50
51 /* Compare memory to memory */
52 static
53 int mem_cmp (const void* dst, const void* src, int cnt) {
54 const char *d = (const char *)dst, *s = (const char *)src;
55 int r = 0;
56 while (cnt-- && (r = *d++ - *s++) == 0) ;
57 return r;
58 }
59
60 /* Check if chr is contained in the string */
61 static
62 int chk_chr (const char* str, int chr) {
63 while (*str && *str != chr) str++;
64 return *str;
65 }
66
67
68
69 /*-----------------------------------------------------------------------*/
70 /* FAT access - Read value of a FAT entry */
71 /*-----------------------------------------------------------------------*/
72
73 static
74 CLUST get_fat ( /* 1:IO error, Else:Cluster status */
75 CLUST clst /* Cluster# to get the link information */
76 )
77 {
78 WORD wc, bc, ofs;
79 BYTE buf[4];
80 FATFS *fs = FatFs;
81
82
83 if (clst < 2 || clst >= fs->max_clust) /* Range check */
84 return 1;
85
86 switch (fs->fs_type) {
87 case FS_FAT12 :
88 bc = (WORD)clst; bc += bc / 2;
89 ofs = bc % 512; bc /= 512;
90 if (ofs != 511) {
91 if (disk_readp(buf, fs->fatbase + bc, ofs, 2)) break;
92 } else {
93 if (disk_readp(buf, fs->fatbase + bc, 511, 1)) break;
94 if (disk_readp(buf+1, fs->fatbase + bc + 1, 0, 1)) break;
95 }
96 wc = LD_WORD(buf);
97 return (clst & 1) ? (wc >> 4) : (wc & 0xFFF);
98
99 case FS_FAT16 :
100 if (disk_readp(buf, fs->fatbase + clst / 256, (WORD)(((WORD)clst % 256) * 2), 2)) break;
101 return LD_WORD(buf);
102 #if _FS_FAT32
103 case FS_FAT32 :
104 if (disk_readp(buf, fs->fatbase + clst / 128, (WORD)(((WORD)clst % 128) * 4), 4)) break;
105 return LD_DWORD(buf) & 0x0FFFFFFF;
106 #endif
107 }
108
109 return 1; /* An error occurred at the disk I/O layer */
110 }
111
112
113
114
115 /*-----------------------------------------------------------------------*/
116 /* Get sector# from cluster# */
117 /*-----------------------------------------------------------------------*/
118
119 static
120 DWORD clust2sect ( /* !=0: Sector number, 0: Failed - invalid cluster# */
121 CLUST clst /* Cluster# to be converted */
122 )
123 {
124 FATFS *fs = FatFs;
125
126
127 clst -= 2;
128 if (clst >= (fs->max_clust - 2)) return 0; /* Invalid cluster# */
129 return (DWORD)clst * fs->csize + fs->database;
130 }
131
132
133
134
135 /*-----------------------------------------------------------------------*/
136 /* Directory handling - Rewind directory index */
137 /*-----------------------------------------------------------------------*/
138
139 static
140 FRESULT dir_rewind (
141 DIR *dj /* Pointer to directory object */
142 )
143 {
144 CLUST clst;
145 FATFS *fs = FatFs;
146
147
148 dj->index = 0;
149 clst = dj->sclust;
150 if (clst == 1 || clst >= fs->max_clust) /* Check start cluster range */
151 return FR_DISK_ERR;
152 #if _FS_FAT32
153 if (!clst && fs->fs_type == FS_FAT32) /* Replace cluster# 0 with root cluster# if in FAT32 */
154 clst = fs->dirbase;
155 #endif
156 dj->clust = clst; /* Current cluster */
157 dj->sect = clst ? clust2sect(clst) : fs->dirbase; /* Current sector */
158
159 return FR_OK; /* Seek succeeded */
160 }
161
162
163
164
165 /*-----------------------------------------------------------------------*/
166 /* Directory handling - Move directory index next */
167 /*-----------------------------------------------------------------------*/
168
169 static
170 FRESULT dir_next ( /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:EOT and could not stretch */
171 DIR *dj /* Pointer to directory object */
172 )
173 {
174 CLUST clst;
175 WORD i;
176 FATFS *fs = FatFs;
177
178
179 i = dj->index + 1;
180 if (!i || !dj->sect) /* Report EOT when index has reached 65535 */
181 return FR_NO_FILE;
182
183 if (!(i & (16-1))) { /* Sector changed? */
184 dj->sect++; /* Next sector */
185
186 if (dj->clust == 0) { /* Static table */
187 if (i >= fs->n_rootdir) /* Report EOT when end of table */
188 return FR_NO_FILE;
189 }
190 else { /* Dynamic table */
191 if (((i / 16) & (fs->csize-1)) == 0) { /* Cluster changed? */
192 clst = get_fat(dj->clust); /* Get next cluster */
193 if (clst <= 1) return FR_DISK_ERR;
194 if (clst >= fs->max_clust) /* When it reached end of dynamic table */
195 return FR_NO_FILE; /* Report EOT */
196 dj->clust = clst; /* Initialize data for new cluster */
197 dj->sect = clust2sect(clst);
198 }
199 }
200 }
201
202 dj->index = i;
203
204 return FR_OK;
205 }
206
207
208
209
210 /*-----------------------------------------------------------------------*/
211 /* Directory handling - Find an object in the directory */
212 /*-----------------------------------------------------------------------*/
213
214 static
215 FRESULT dir_find (
216 DIR *dj /* Pointer to the directory object linked to the file name */
217 )
218 {
219 FRESULT res;
220 BYTE c, *dir;
221
222
223 res = dir_rewind(dj); /* Rewind directory object */
224 if (res != FR_OK) return res;
225
226 dir = FatFs->buf;
227 do {
228 res = disk_readp(dir, dj->sect, (WORD)((dj->index % 16) * 32), 32) /* Read an entry */
229 ? FR_DISK_ERR : FR_OK;
230 if (res != FR_OK) break;
231 c = dir[DIR_Name]; /* First character */
232 if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */
233 if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */
234 break;
235 res = dir_next(dj); /* Next entry */
236 } while (res == FR_OK);
237
238 return res;
239 }
240
241
242
243
244 /*-----------------------------------------------------------------------*/
245 /* Read an object from the directory */
246 /*-----------------------------------------------------------------------*/
247 #if _USE_DIR
248 static
249 FRESULT dir_read (
250 DIR *dj /* Pointer to the directory object to store read object name */
251 )
252 {
253 FRESULT res;
254 BYTE a, c, *dir;
255
256
257 res = FR_NO_FILE;
258 while (dj->sect) {
259 dir = FatFs->buf;
260 res = disk_readp(dir, dj->sect, (WORD)((dj->index % 16) * 32), 32) /* Read an entry */
261 ? FR_DISK_ERR : FR_OK;
262 if (res != FR_OK) break;
263 c = dir[DIR_Name];
264 if (c == 0) { res = FR_NO_FILE; break; } /* Reached to end of table */
265 a = dir[DIR_Attr] & AM_MASK;
266 if (c != 0xE5 && c != '.' && !(a & AM_VOL)) /* Is it a valid entry? */
267 break;
268 res = dir_next(dj); /* Next entry */
269 if (res != FR_OK) break;
270 }
271
272 if (res != FR_OK) dj->sect = 0;
273
274 return res;
275 }
276 #endif
277
278
279
280 /*-----------------------------------------------------------------------*/
281 /* Pick a segment and create the object name in directory form */
282 /*-----------------------------------------------------------------------*/
283
284
285 static
286 FRESULT create_name (
287 DIR *dj, /* Pointer to the directory object */
288 const char **path /* Pointer to pointer to the segment in the path string */
289 )
290 {
291 BYTE c, ni, si, i, *sfn;
292 const char *p;
293
294 /* Create file name in directory form */
295 sfn = dj->fn;
296 mem_set(sfn, ' ', 11);
297 si = i = 0; ni = 8;
298 p = *path;
299 for (;;) {
300 c = p[si++];
301 if (c < ' ' || c == '/') break; /* Break on end of segment */
302 if (c == '.' || i >= ni) {
303 if (ni != 8 || c != '.') return FR_INVALID_NAME;
304 i = 8; ni = 11;
305 continue;
306 }
307 if (c >= 0x7F || chk_chr(" +,;[=\\]\"*:<>\?|", c)) /* Reject unallowable chrs for SFN */
308 return FR_INVALID_NAME;
309 if (c >='a' && c <= 'z') c -= 0x20;
310 sfn[i++] = c;
311 }
312 if (!i) return FR_INVALID_NAME; /* Reject null string */
313 *path = &p[si]; /* Rerun pointer to the next segment */
314
315 sfn[11] = (c < ' ') ? 1 : 0; /* Set last segment flag if end of path */
316
317 return FR_OK;
318 }
319
320
321
322
323 /*-----------------------------------------------------------------------*/
324 /* Get file information from directory entry */
325 /*-----------------------------------------------------------------------*/
326 #if _USE_DIR
327 static
328 void get_fileinfo ( /* No return code */
329 DIR *dj, /* Pointer to the directory object */
330 FILINFO *fno /* Pointer to store the file information */
331 )
332 {
333 BYTE i, c, *dir;
334 char *p;
335
336
337 p = fno->fname;
338 if (dj->sect) {
339 dir = FatFs->buf;
340 for (i = 0; i < 8; i++) { /* Copy file name body */
341 c = dir[i];
342 if (c == ' ') break;
343 if (c == 0x05) c = 0xE5;
344 *p++ = c;
345 }
346 if (dir[8] != ' ') { /* Copy file name extension */
347 *p++ = '.';
348 for (i = 8; i < 11; i++) {
349 c = dir[i];
350 if (c == ' ') break;
351 *p++ = c;
352 }
353 }
354 fno->fattrib = dir[DIR_Attr]; /* Attribute */
355 fno->fsize = LD_DWORD(dir+DIR_FileSize); /* Size */
356 fno->fdate = LD_WORD(dir+DIR_WrtDate); /* Date */
357 fno->ftime = LD_WORD(dir+DIR_WrtTime); /* Time */
358 }
359 *p = 0;
360 }
361 #endif /* _USE_DIR */
362
363
364
365 /*-----------------------------------------------------------------------*/
366 /* Follow a file path */
367 /*-----------------------------------------------------------------------*/
368
369 static
370 FRESULT follow_path ( /* FR_OK(0): successful, !=0: error code */
371 DIR *dj, /* Directory object to return last directory and found object */
372 const char *path /* Full-path string to find a file or directory */
373 )
374 {
375 FRESULT res;
376 BYTE *dir;
377
378
379 if (*path == '/') path++; /* Strip heading separator */
380 dj->sclust = 0; /* Set start directory (always root dir) */
381
382 if ((BYTE)*path < ' ') { /* Null path means the root directory */
383 res = dir_rewind(dj);
384 FatFs->buf[0] = 0;
385
386 } else { /* Follow path */
387 for (;;) {
388 res = create_name(dj, &path); /* Get a segment */
389 if (res != FR_OK) break;
390 res = dir_find(dj); /* Find it */
391 if (res != FR_OK) { /* Could not find the object */
392 if (res == FR_NO_FILE && !*(dj->fn+11))
393 res = FR_NO_PATH;
394 break;
395 }
396 if (*(dj->fn+11)) break; /* Last segment match. Function completed. */
397 dir = FatFs->buf; /* There is next segment. Follow the sub directory */
398 if (!(dir[DIR_Attr] & AM_DIR)) { /* Cannot follow because it is a file */
399 res = FR_NO_PATH; break;
400 }
401 dj->sclust =
402 #if _FS_FAT32
403 ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) |
404 #endif
405 LD_WORD(dir+DIR_FstClusLO);
406 }
407 }
408
409 return res;
410 }
411
412
413
414
415 /*-----------------------------------------------------------------------*/
416 /* Check a sector if it is an FAT boot record */
417 /*-----------------------------------------------------------------------*/
418
419 static
420 BYTE check_fs ( /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record, 3:Error */
421 BYTE *buf, /* Working buffer */
422 DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */
423 )
424 {
425 if (disk_readp(buf, sect, 510, 2)) /* Read the boot sector */
426 return 3;
427 if (LD_WORD(buf) != 0xAA55) /* Check record signature */
428 return 2;
429
430 if (!disk_readp(buf, sect, BS_FilSysType, 2) && LD_WORD(buf) == 0x4146) /* Check FAT12/16 */
431 return 0;
432 #if _FS_FAT32
433 if (!disk_readp(buf, sect, BS_FilSysType32, 2) && LD_WORD(buf) == 0x4146) /* Check FAT32 */
434 return 0;
435 #endif
436 return 1;
437 }
438
439
440
441
442 /*--------------------------------------------------------------------------
443
444 Public Functions
445
446 --------------------------------------------------------------------------*/
447
448
449
450 /*-----------------------------------------------------------------------*/
451 /* Mount/Unmount a Logical Drive */
452 /*-----------------------------------------------------------------------*/
453
454 FRESULT pf_mount (
455 FATFS *fs /* Pointer to new file system object (NULL: Unmount) */
456 )
457 {
458 BYTE fmt, buf[36];
459 DWORD bsect, fsize, tsect, mclst;
460
461
462 FatFs = 0;
463 if (!fs) return FR_OK; /* Unregister fs object */
464
465 if (disk_initialize() & STA_NOINIT) /* Check if the drive is ready or not */
466 return FR_NOT_READY;
467
468 /* Search FAT partition on the drive */
469 bsect = 0;
470 fmt = check_fs(buf, bsect); /* Check sector 0 as an SFD format */
471 if (fmt == 1) { /* Not an FAT boot record, it may be FDISK format */
472 /* Check a partition listed in top of the partition table */
473 if (disk_readp(buf, bsect, MBR_Table, 16)) { /* 1st partition entry */
474 fmt = 3;
475 } else {
476 if (buf[4]) { /* Is the partition existing? */
477 bsect = LD_DWORD(&buf[8]); /* Partition offset in LBA */
478 fmt = check_fs(buf, bsect); /* Check the partition */
479 }
480 }
481 }
482 if (fmt == 3) return FR_DISK_ERR;
483 if (fmt) return FR_NO_FILESYSTEM; /* No valid FAT partition is found */
484
485 /* Initialize the file system object */
486 if (disk_readp(buf, bsect, 13, sizeof(buf))) return FR_DISK_ERR;
487
488 fsize = LD_WORD(buf+BPB_FATSz16-13); /* Number of sectors per FAT */
489 if (!fsize) fsize = LD_DWORD(buf+BPB_FATSz32-13);
490
491 fsize *= buf[BPB_NumFATs-13]; /* Number of sectors in FAT area */
492 fs->fatbase = bsect + LD_WORD(buf+BPB_RsvdSecCnt-13); /* FAT start sector (lba) */
493 fs->csize = buf[BPB_SecPerClus-13]; /* Number of sectors per cluster */
494 fs->n_rootdir = LD_WORD(buf+BPB_RootEntCnt-13); /* Number of root directory entries */
495 tsect = LD_WORD(buf+BPB_TotSec16-13); /* Number of sectors on the file system */
496 if (!tsect) tsect = LD_DWORD(buf+BPB_TotSec32-13);
497 mclst = (tsect /* Last cluster# + 1 */
498 - LD_WORD(buf+BPB_RsvdSecCnt-13) - fsize - fs->n_rootdir / 16
499 ) / fs->csize + 2;
500 fs->max_clust = (CLUST)mclst;
501
502 fmt = FS_FAT12; /* Determine the FAT sub type */
503 if (mclst >= 0xFF7) fmt = FS_FAT16; /* Number of clusters >= 0xFF5 */
504 if (mclst >= 0xFFF7) /* Number of clusters >= 0xFFF5 */
505 #if _FS_FAT32
506 fmt = FS_FAT32;
507 #else
508 return FR_NO_FILESYSTEM;
509 #endif
510
511 fs->fs_type = fmt; /* FAT sub-type */
512 #if _FS_FAT32
513 if (fmt == FS_FAT32)
514 fs->dirbase = LD_DWORD(buf+(BPB_RootClus-13)); /* Root directory start cluster */
515 else
516 #endif
517 fs->dirbase = fs->fatbase + fsize; /* Root directory start sector (lba) */
518 fs->database = fs->fatbase + fsize + fs->n_rootdir / 16; /* Data start sector (lba) */
519
520 fs->flag = 0;
521 FatFs = fs;
522
523 return FR_OK;
524 }
525
526
527
528
529 /*-----------------------------------------------------------------------*/
530 /* Open or Create a File */
531 /*-----------------------------------------------------------------------*/
532
533 FRESULT pf_open (
534 const char *path /* Pointer to the file name */
535 )
536 {
537 FRESULT res;
538 DIR dj;
539 BYTE sp[12], dir[32];
540 FATFS *fs = FatFs;
541
542
543 if (!fs) /* Check file system */
544 return FR_NOT_ENABLED;
545
546 fs->flag = 0;
547 fs->buf = dir;
548 dj.fn = sp;
549 res = follow_path(&dj, path); /* Follow the file path */
550 if (res != FR_OK) return res; /* Follow failed */
551 if (!dir[0] || (dir[DIR_Attr] & AM_DIR)) /* It is a directory */
552 return FR_NO_FILE;
553
554 fs->org_clust = /* File start cluster */
555 #if _FS_FAT32
556 ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) |
557 #endif
558 LD_WORD(dir+DIR_FstClusLO);
559 fs->fsize = LD_DWORD(dir+DIR_FileSize); /* File size */
560 fs->fptr = 0; /* File pointer */
561 fs->flag = FA_READ;
562
563 return FR_OK;
564 }
565
566
567
568
569 /*-----------------------------------------------------------------------*/
570 /* Read File */
571 /*-----------------------------------------------------------------------*/
572
573 FRESULT pf_read (
574 void* dest, /* Pointer to the destination object */
575 WORD btr, /* Number of bytes to read (bit15:destination) */
576 WORD* br /* Pointer to number of bytes read */
577 )
578 {
579 DRESULT dr;
580 CLUST clst;
581 DWORD sect, remain;
582 WORD rcnt;
583 BYTE *rbuff = dest;
584 FATFS *fs = FatFs;
585
586
587 *br = 0;
588 if (!fs) return FR_NOT_ENABLED; /* Check file system */
589 if (!(fs->flag & FA_READ))
590 return FR_INVALID_OBJECT;
591
592 remain = fs->fsize - fs->fptr;
593 if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */
594
595 for ( ; btr; /* Repeat until all data transferred */
596 rbuff += rcnt, fs->fptr += rcnt, *br += rcnt, btr -= rcnt) {
597 if ((fs->fptr % 512) == 0) { /* On the sector boundary? */
598 if ((fs->fptr / 512 % fs->csize) == 0) { /* On the cluster boundary? */
599 clst = (fs->fptr == 0) ? /* On the top of the file? */
600 fs->org_clust : get_fat(fs->curr_clust);
601 if (clst <= 1) {
602 fs->flag = 0; return FR_DISK_ERR;
603 }
604 fs->curr_clust = clst; /* Update current cluster */
605 fs->csect = 0; /* Reset sector offset in the cluster */
606 }
607 sect = clust2sect(fs->curr_clust); /* Get current sector */
608 if (!sect) {
609 fs->flag = 0; return FR_DISK_ERR;
610 }
611 sect += fs->csect;
612 fs->dsect = sect;
613 fs->csect++; /* Next sector address in the cluster */
614 }
615 rcnt = 512 - ((WORD)fs->fptr % 512); /* Get partial sector data from sector buffer */
616 if (rcnt > btr) rcnt = btr;
617 if (fs->flag & FA_STREAM) {
618 dr = disk_readp(dest, fs->dsect, (WORD)(fs->fptr % 512), (WORD)(rcnt | 0x8000));
619 } else {
620 dr = disk_readp(rbuff, fs->dsect, (WORD)(fs->fptr % 512), rcnt);
621 }
622 if (dr) {
623 fs->flag = 0;
624 return (dr == RES_STRERR) ? FR_STREAM_ERR : FR_DISK_ERR;
625 }
626 }
627
628 return FR_OK;
629 }
630
631
632
633
634 #if _USE_LSEEK
635 /*-----------------------------------------------------------------------*/
636 /* Seek File R/W Pointer */
637 /*-----------------------------------------------------------------------*/
638
639 FRESULT pf_lseek (
640 DWORD ofs /* File pointer from top of file */
641 )
642 {
643 CLUST clst;
644 DWORD bcs, nsect, ifptr;
645 FATFS *fs = FatFs;
646
647
648 if (!fs) return FR_NOT_ENABLED; /* Check file system */
649 if (!(fs->flag & FA_READ))
650 return FR_INVALID_OBJECT;
651
652 if (ofs > fs->fsize) ofs = fs->fsize; /* Clip offset with the file size */
653 ifptr = fs->fptr;
654 fs->fptr = 0;
655 if (ofs > 0) {
656 bcs = (DWORD)fs->csize * 512; /* Cluster size (byte) */
657 if (ifptr > 0 &&
658 (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
659 fs->fptr = (ifptr - 1) & ~(bcs - 1); /* start from the current cluster */
660 ofs -= fs->fptr;
661 clst = fs->curr_clust;
662 } else { /* When seek to back cluster, */
663 clst = fs->org_clust; /* start from the first cluster */
664 fs->curr_clust = clst;
665 }
666 while (ofs > bcs) { /* Cluster following loop */
667 clst = get_fat(clst); /* Follow cluster chain if not in write mode */
668 if (clst <= 1 || clst >= fs->max_clust) {
669 fs->flag = 0; return FR_DISK_ERR;
670 }
671 fs->curr_clust = clst;
672 fs->fptr += bcs;
673 ofs -= bcs;
674 }
675 fs->fptr += ofs;
676 fs->csect = (BYTE)(ofs / 512) + 1; /* Sector offset in the cluster */
677 nsect = clust2sect(clst); /* Current sector */
678 if (!nsect) {
679 fs->flag = 0; return FR_DISK_ERR;
680 }
681 fs->dsect = nsect + fs->csect - 1;
682 }
683
684 return FR_OK;
685 }
686 #endif
687
688
689 #if _USE_DIR
690 /*-----------------------------------------------------------------------*/
691 /* Create a Directory Object */
692 /*-----------------------------------------------------------------------*/
693
694 FRESULT pf_opendir (
695 DIR *dj, /* Pointer to directory object to create */
696 const char *path /* Pointer to the directory path */
697 )
698 {
699 FRESULT res;
700 BYTE sp[12], dir[32];
701 FATFS *fs = FatFs;
702
703
704 if (!fs) { /* Check file system */
705 res = FR_NOT_ENABLED;
706 } else {
707 fs->buf = dir;
708 dj->fn = sp;
709 res = follow_path(dj, path); /* Follow the path to the directory */
710 if (res == FR_OK) { /* Follow completed */
711 if (dir[0]) { /* It is not the root dir */
712 if (dir[DIR_Attr] & AM_DIR) { /* The object is a directory */
713 dj->sclust =
714 #if _FS_FAT32
715 ((DWORD)LD_WORD(dir+DIR_FstClusHI) << 16) |
716 #endif
717 LD_WORD(dir+DIR_FstClusLO);
718 } else { /* The object is not a directory */
719 res = FR_NO_PATH;
720 }
721 }
722 if (res == FR_OK) {
723 res = dir_rewind(dj); /* Rewind dir */
724 }
725 }
726 if (res == FR_NO_FILE) res = FR_NO_PATH;
727 }
728
729 return res;
730 }
731
732
733
734
735 /*-----------------------------------------------------------------------*/
736 /* Read Directory Entry in Sequence */
737 /*-----------------------------------------------------------------------*/
738
739 FRESULT pf_readdir (
740 DIR *dj, /* Pointer to the open directory object */
741 FILINFO *fno /* Pointer to file information to return */
742 )
743 {
744 FRESULT res;
745 BYTE sp[12], dir[32];
746 FATFS *fs = FatFs;
747
748
749 if (!fs) { /* Check file system */
750 res = FR_NOT_ENABLED;
751 } else {
752 fs->buf = dir;
753 dj->fn = sp;
754 if (!fno) {
755 res = dir_rewind(dj);
756 } else {
757 res = dir_read(dj);
758 if (res == FR_NO_FILE) {
759 dj->sect = 0;
760 res = FR_OK;
761 }
762 if (res == FR_OK) { /* A valid entry is found */
763 get_fileinfo(dj, fno); /* Get the object information */
764 res = dir_next(dj); /* Increment index for next */
765 if (res == FR_NO_FILE) {
766 dj->sect = 0;
767 res = FR_OK;
768 }
769 }
770 }
771 }
772
773 return res;
774 }
775
776 #endif /* _FS_DIR */
777
USB isp AVR programmer