Merge remote-tracking branch 'u-boot/master'
[platform/kernel/u-boot.git] / fs / fat / fat.c
1 /*
2  * fat.c
3  *
4  * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
5  *
6  * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
7  * 2003-03-10 - kharris@nexus-tech.net - ported to uboot
8  *
9  * See file CREDITS for list of people who contributed to this
10  * project.
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License as
14  * published by the Free Software Foundation; either version 2 of
15  * the License, or (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25  * MA 02111-1307 USA
26  */
27
28 #include <common.h>
29 #include <config.h>
30 #include <exports.h>
31 #include <fat.h>
32 #include <asm/byteorder.h>
33 #include <part.h>
34 #include <malloc.h>
35 #include <linux/compiler.h>
36
37 /*
38  * Convert a string to lowercase.
39  */
40 static void downcase(char *str)
41 {
42         while (*str != '\0') {
43                 TOLOWER(*str);
44                 str++;
45         }
46 }
47
48 static block_dev_desc_t *cur_dev;
49 static unsigned int cur_part_nr;
50 static disk_partition_t cur_part_info;
51
52 #define DOS_BOOT_MAGIC_OFFSET   0x1fe
53 #define DOS_FS_TYPE_OFFSET      0x36
54 #define DOS_FS32_TYPE_OFFSET    0x52
55
56 static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
57 {
58         if (!cur_dev || !cur_dev->block_read)
59                 return -1;
60
61         return cur_dev->block_read(cur_dev->dev,
62                         cur_part_info.start + block, nr_blocks, buf);
63 }
64
65 int fat_register_device(block_dev_desc_t * dev_desc, int part_no)
66 {
67         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
68
69         /* First close any currently found FAT filesystem */
70         cur_dev = NULL;
71
72 #if (defined(CONFIG_CMD_IDE) || \
73      defined(CONFIG_CMD_SATA) || \
74      defined(CONFIG_CMD_SCSI) || \
75      defined(CONFIG_CMD_USB) || \
76      defined(CONFIG_MMC) || \
77      defined(CONFIG_SYSTEMACE) )
78
79         /* Read the partition table, if present */
80         if (!get_partition_info(dev_desc, part_no, &cur_part_info)) {
81                 cur_dev = dev_desc;
82                 cur_part_nr = part_no;
83         }
84 #endif
85
86         /* Otherwise it might be a superfloppy (whole-disk FAT filesystem) */
87         if (!cur_dev) {
88                 if (part_no != 1) {
89                         printf("** Partition %d not valid on device %d **\n",
90                                         part_no, dev_desc->dev);
91                         return -1;
92                 }
93
94                 cur_dev = dev_desc;
95                 cur_part_nr = 1;
96                 cur_part_info.start = 0;
97                 cur_part_info.size = dev_desc->lba;
98                 cur_part_info.blksz = dev_desc->blksz;
99                 memset(cur_part_info.name, 0, sizeof(cur_part_info.name));
100                 memset(cur_part_info.type, 0, sizeof(cur_part_info.type));
101         }
102
103         /* Make sure it has a valid FAT header */
104         if (disk_read(0, 1, buffer) != 1) {
105                 cur_dev = NULL;
106                 return -1;
107         }
108
109         /* Check if it's actually a DOS volume */
110         if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) {
111                 cur_dev = NULL;
112                 return -1;
113         }
114
115         /* Check for FAT12/FAT16/FAT32 filesystem */
116         if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3))
117                 return 0;
118         if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5))
119                 return 0;
120
121         cur_dev = NULL;
122         return -1;
123 }
124
125
126 /*
127  * Get the first occurence of a directory delimiter ('/' or '\') in a string.
128  * Return index into string if found, -1 otherwise.
129  */
130 static int dirdelim(char *str)
131 {
132         char *start = str;
133
134         while (*str != '\0') {
135                 if (ISDIRDELIM(*str))
136                         return str - start;
137                 str++;
138         }
139         return -1;
140 }
141
142 /*
143  * Extract zero terminated short name from a directory entry.
144  */
145 static void get_name(dir_entry *dirent, char *s_name)
146 {
147         char *ptr;
148
149         memcpy(s_name, dirent->name, 8);
150         s_name[8] = '\0';
151         ptr = s_name;
152         while (*ptr && *ptr != ' ')
153                 ptr++;
154         if (dirent->ext[0] && dirent->ext[0] != ' ') {
155                 *ptr = '.';
156                 ptr++;
157                 memcpy(ptr, dirent->ext, 3);
158                 ptr[3] = '\0';
159                 while (*ptr && *ptr != ' ')
160                         ptr++;
161         }
162         *ptr = '\0';
163         if (*s_name == DELETED_FLAG)
164                 *s_name = '\0';
165         else if (*s_name == aRING)
166                 *s_name = DELETED_FLAG;
167         downcase(s_name);
168 }
169
170 /*
171  * Get the entry at index 'entry' in a FAT (12/16/32) table.
172  * On failure 0x00 is returned.
173  */
174 static __u32 get_fatent(fsdata *mydata, __u32 entry)
175 {
176         __u32 bufnum;
177         __u32 off16, offset;
178         __u32 ret = 0x00;
179         __u16 val1, val2;
180
181         switch (mydata->fatsize) {
182         case 32:
183                 bufnum = entry / FAT32BUFSIZE;
184                 offset = entry - bufnum * FAT32BUFSIZE;
185                 break;
186         case 16:
187                 bufnum = entry / FAT16BUFSIZE;
188                 offset = entry - bufnum * FAT16BUFSIZE;
189                 break;
190         case 12:
191                 bufnum = entry / FAT12BUFSIZE;
192                 offset = entry - bufnum * FAT12BUFSIZE;
193                 break;
194
195         default:
196                 /* Unsupported FAT size */
197                 return ret;
198         }
199
200         debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
201                mydata->fatsize, entry, entry, offset, offset);
202
203         /* Read a new block of FAT entries into the cache. */
204         if (bufnum != mydata->fatbufnum) {
205                 __u32 getsize = FATBUFBLOCKS;
206                 __u8 *bufptr = mydata->fatbuf;
207                 __u32 fatlength = mydata->fatlength;
208                 __u32 startblock = bufnum * FATBUFBLOCKS;
209
210                 if (startblock + getsize > fatlength)
211                         getsize = fatlength - startblock;
212
213                 startblock += mydata->fat_sect; /* Offset from start of disk */
214
215                 if (disk_read(startblock, getsize, bufptr) < 0) {
216                         debug("Error reading FAT blocks\n");
217                         return ret;
218                 }
219                 mydata->fatbufnum = bufnum;
220         }
221
222         /* Get the actual entry from the table */
223         switch (mydata->fatsize) {
224         case 32:
225                 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
226                 break;
227         case 16:
228                 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
229                 break;
230         case 12:
231                 off16 = (offset * 3) / 4;
232
233                 switch (offset & 0x3) {
234                 case 0:
235                         ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
236                         ret &= 0xfff;
237                         break;
238                 case 1:
239                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
240                         val1 &= 0xf000;
241                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
242                         val2 &= 0x00ff;
243                         ret = (val2 << 4) | (val1 >> 12);
244                         break;
245                 case 2:
246                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
247                         val1 &= 0xff00;
248                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
249                         val2 &= 0x000f;
250                         ret = (val2 << 8) | (val1 >> 8);
251                         break;
252                 case 3:
253                         ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
254                         ret = (ret & 0xfff0) >> 4;
255                         break;
256                 default:
257                         break;
258                 }
259                 break;
260         }
261         debug("FAT%d: ret: %08x, offset: %04x\n",
262                mydata->fatsize, ret, offset);
263
264         return ret;
265 }
266
267 /*
268  * Read at most 'size' bytes from the specified cluster into 'buffer'.
269  * Return 0 on success, -1 otherwise.
270  */
271 static int
272 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
273 {
274         __u32 idx = 0;
275         __u32 startsect;
276         int ret;
277
278         if (clustnum > 0) {
279                 startsect = mydata->data_begin +
280                                 clustnum * mydata->clust_size;
281         } else {
282                 startsect = mydata->rootdir_sect;
283         }
284
285         debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
286
287         if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
288                 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
289
290                 printf("FAT: Misaligned buffer address (%p)\n", buffer);
291
292                 while (size >= mydata->sect_size) {
293                         ret = disk_read(startsect++, 1, tmpbuf);
294                         if (ret != 1) {
295                                 debug("Error reading data (got %d)\n", ret);
296                                 return -1;
297                         }
298
299                         memcpy(buffer, tmpbuf, mydata->sect_size);
300                         buffer += mydata->sect_size;
301                         size -= mydata->sect_size;
302                 }
303         } else {
304                 idx = size / mydata->sect_size;
305                 ret = disk_read(startsect, idx, buffer);
306                 if (ret != idx) {
307                         debug("Error reading data (got %d)\n", ret);
308                         return -1;
309                 }
310                 startsect += idx;
311                 idx *= mydata->sect_size;
312                 buffer += idx;
313                 size -= idx;
314         }
315         if (size) {
316                 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
317
318                 ret = disk_read(startsect, 1, tmpbuf);
319                 if (ret != 1) {
320                         debug("Error reading data (got %d)\n", ret);
321                         return -1;
322                 }
323
324                 memcpy(buffer, tmpbuf, size);
325         }
326
327         return 0;
328 }
329
330 /*
331  * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr'
332  * into 'buffer'.
333  * Return the number of bytes read or -1 on fatal errors.
334  */
335 __u8 get_contents_vfatname_block[MAX_CLUSTSIZE]
336         __aligned(ARCH_DMA_MINALIGN);
337
338 static long
339 get_contents(fsdata *mydata, dir_entry *dentptr, unsigned long pos,
340              __u8 *buffer, unsigned long maxsize)
341 {
342         unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
343         unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
344         __u32 curclust = START(dentptr);
345         __u32 endclust, newclust;
346         unsigned long actsize;
347
348         debug("Filesize: %ld bytes\n", filesize);
349
350         if (pos >= filesize) {
351                 debug("Read position past EOF: %lu\n", pos);
352                 return gotsize;
353         }
354
355         if (maxsize > 0 && filesize > pos + maxsize)
356                 filesize = pos + maxsize;
357
358         debug("%ld bytes\n", filesize);
359
360         actsize = bytesperclust;
361
362         /* go to cluster at pos */
363         while (actsize <= pos) {
364                 curclust = get_fatent(mydata, curclust);
365                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
366                         debug("curclust: 0x%x\n", curclust);
367                         debug("Invalid FAT entry\n");
368                         return gotsize;
369                 }
370                 actsize += bytesperclust;
371         }
372
373         /* actsize > pos */
374         actsize -= bytesperclust;
375         filesize -= actsize;
376         pos -= actsize;
377
378         /* align to beginning of next cluster if any */
379         if (pos) {
380                 actsize = min(filesize, bytesperclust);
381                 if (get_cluster(mydata, curclust, get_contents_vfatname_block,
382                                 (int)actsize) != 0) {
383                         printf("Error reading cluster\n");
384                         return -1;
385                 }
386                 filesize -= actsize;
387                 actsize -= pos;
388                 memcpy(buffer, get_contents_vfatname_block + pos, actsize);
389                 gotsize += actsize;
390                 if (!filesize)
391                         return gotsize;
392                 buffer += actsize;
393
394                 curclust = get_fatent(mydata, curclust);
395                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
396                         debug("curclust: 0x%x\n", curclust);
397                         debug("Invalid FAT entry\n");
398                         return gotsize;
399                 }
400         }
401
402         actsize = bytesperclust;
403         endclust = curclust;
404
405         do {
406                 /* search for consecutive clusters */
407                 while (actsize < filesize) {
408                         newclust = get_fatent(mydata, endclust);
409                         if ((newclust - 1) != endclust)
410                                 goto getit;
411                         if (CHECK_CLUST(newclust, mydata->fatsize)) {
412                                 debug("curclust: 0x%x\n", newclust);
413                                 debug("Invalid FAT entry\n");
414                                 return gotsize;
415                         }
416                         endclust = newclust;
417                         actsize += bytesperclust;
418                 }
419
420                 /* get remaining bytes */
421                 actsize = filesize;
422                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
423                         printf("Error reading cluster\n");
424                         return -1;
425                 }
426                 gotsize += actsize;
427                 return gotsize;
428 getit:
429                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
430                         printf("Error reading cluster\n");
431                         return -1;
432                 }
433                 gotsize += (int)actsize;
434                 filesize -= actsize;
435                 buffer += actsize;
436
437                 curclust = get_fatent(mydata, endclust);
438                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
439                         debug("curclust: 0x%x\n", curclust);
440                         printf("Invalid FAT entry\n");
441                         return gotsize;
442                 }
443                 actsize = bytesperclust;
444                 endclust = curclust;
445         } while (1);
446 }
447
448 #ifdef CONFIG_SUPPORT_VFAT
449 /*
450  * Extract the file name information from 'slotptr' into 'l_name',
451  * starting at l_name[*idx].
452  * Return 1 if terminator (zero byte) is found, 0 otherwise.
453  */
454 static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
455 {
456         int j;
457
458         for (j = 0; j <= 8; j += 2) {
459                 l_name[*idx] = slotptr->name0_4[j];
460                 if (l_name[*idx] == 0x00)
461                         return 1;
462                 (*idx)++;
463         }
464         for (j = 0; j <= 10; j += 2) {
465                 l_name[*idx] = slotptr->name5_10[j];
466                 if (l_name[*idx] == 0x00)
467                         return 1;
468                 (*idx)++;
469         }
470         for (j = 0; j <= 2; j += 2) {
471                 l_name[*idx] = slotptr->name11_12[j];
472                 if (l_name[*idx] == 0x00)
473                         return 1;
474                 (*idx)++;
475         }
476
477         return 0;
478 }
479
480 /*
481  * Extract the full long filename starting at 'retdent' (which is really
482  * a slot) into 'l_name'. If successful also copy the real directory entry
483  * into 'retdent'
484  * Return 0 on success, -1 otherwise.
485  */
486 static int
487 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
488              dir_entry *retdent, char *l_name)
489 {
490         dir_entry *realdent;
491         dir_slot *slotptr = (dir_slot *)retdent;
492         __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
493                                                         PREFETCH_BLOCKS :
494                                                         mydata->clust_size);
495         __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
496         int idx = 0;
497
498         if (counter > VFAT_MAXSEQ) {
499                 debug("Error: VFAT name is too long\n");
500                 return -1;
501         }
502
503         while ((__u8 *)slotptr < buflimit) {
504                 if (counter == 0)
505                         break;
506                 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
507                         return -1;
508                 slotptr++;
509                 counter--;
510         }
511
512         if ((__u8 *)slotptr >= buflimit) {
513                 dir_slot *slotptr2;
514
515                 if (curclust == 0)
516                         return -1;
517                 curclust = get_fatent(mydata, curclust);
518                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
519                         debug("curclust: 0x%x\n", curclust);
520                         printf("Invalid FAT entry\n");
521                         return -1;
522                 }
523
524                 if (get_cluster(mydata, curclust, get_contents_vfatname_block,
525                                 mydata->clust_size * mydata->sect_size) != 0) {
526                         debug("Error: reading directory block\n");
527                         return -1;
528                 }
529
530                 slotptr2 = (dir_slot *)get_contents_vfatname_block;
531                 while (counter > 0) {
532                         if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
533                             & 0xff) != counter)
534                                 return -1;
535                         slotptr2++;
536                         counter--;
537                 }
538
539                 /* Save the real directory entry */
540                 realdent = (dir_entry *)slotptr2;
541                 while ((__u8 *)slotptr2 > get_contents_vfatname_block) {
542                         slotptr2--;
543                         slot2str(slotptr2, l_name, &idx);
544                 }
545         } else {
546                 /* Save the real directory entry */
547                 realdent = (dir_entry *)slotptr;
548         }
549
550         do {
551                 slotptr--;
552                 if (slot2str(slotptr, l_name, &idx))
553                         break;
554         } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
555
556         l_name[idx] = '\0';
557         if (*l_name == DELETED_FLAG)
558                 *l_name = '\0';
559         else if (*l_name == aRING)
560                 *l_name = DELETED_FLAG;
561         downcase(l_name);
562
563         /* Return the real directory entry */
564         memcpy(retdent, realdent, sizeof(dir_entry));
565
566         return 0;
567 }
568
569 /* Calculate short name checksum */
570 static __u8 mkcksum(const char *str)
571 {
572         int i;
573
574         __u8 ret = 0;
575
576         for (i = 0; i < 11; i++) {
577                 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i];
578         }
579
580         return ret;
581 }
582 #endif  /* CONFIG_SUPPORT_VFAT */
583
584 /*
585  * Get the directory entry associated with 'filename' from the directory
586  * starting at 'startsect'
587  */
588 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]
589         __aligned(ARCH_DMA_MINALIGN);
590
591 static dir_entry *get_dentfromdir(fsdata *mydata, int startsect,
592                                   char *filename, dir_entry *retdent,
593                                   int dols)
594 {
595         __u16 prevcksum = 0xffff;
596         __u32 curclust = START(retdent);
597         int files = 0, dirs = 0;
598
599         debug("get_dentfromdir: %s\n", filename);
600
601         while (1) {
602                 dir_entry *dentptr;
603
604                 int i;
605
606                 if (get_cluster(mydata, curclust, get_dentfromdir_block,
607                                 mydata->clust_size * mydata->sect_size) != 0) {
608                         debug("Error: reading directory block\n");
609                         return NULL;
610                 }
611
612                 dentptr = (dir_entry *)get_dentfromdir_block;
613
614                 for (i = 0; i < DIRENTSPERCLUST; i++) {
615                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
616
617                         l_name[0] = '\0';
618                         if (dentptr->name[0] == DELETED_FLAG) {
619                                 dentptr++;
620                                 continue;
621                         }
622                         if ((dentptr->attr & ATTR_VOLUME)) {
623 #ifdef CONFIG_SUPPORT_VFAT
624                                 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
625                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
626                                         prevcksum = ((dir_slot *)dentptr)->alias_checksum;
627                                         get_vfatname(mydata, curclust,
628                                                      get_dentfromdir_block,
629                                                      dentptr, l_name);
630                                         if (dols) {
631                                                 int isdir;
632                                                 char dirc;
633                                                 int doit = 0;
634
635                                                 isdir = (dentptr->attr & ATTR_DIR);
636
637                                                 if (isdir) {
638                                                         dirs++;
639                                                         dirc = '/';
640                                                         doit = 1;
641                                                 } else {
642                                                         dirc = ' ';
643                                                         if (l_name[0] != 0) {
644                                                                 files++;
645                                                                 doit = 1;
646                                                         }
647                                                 }
648                                                 if (doit) {
649                                                         if (dirc == ' ') {
650                                                                 printf(" %8ld   %s%c\n",
651                                                                         (long)FAT2CPU32(dentptr->size),
652                                                                         l_name,
653                                                                         dirc);
654                                                         } else {
655                                                                 printf("            %s%c\n",
656                                                                         l_name,
657                                                                         dirc);
658                                                         }
659                                                 }
660                                                 dentptr++;
661                                                 continue;
662                                         }
663                                         debug("vfatname: |%s|\n", l_name);
664                                 } else
665 #endif
666                                 {
667                                         /* Volume label or VFAT entry */
668                                         dentptr++;
669                                         continue;
670                                 }
671                         }
672                         if (dentptr->name[0] == 0) {
673                                 if (dols) {
674                                         printf("\n%d file(s), %d dir(s)\n\n",
675                                                 files, dirs);
676                                 }
677                                 debug("Dentname == NULL - %d\n", i);
678                                 return NULL;
679                         }
680 #ifdef CONFIG_SUPPORT_VFAT
681                         if (dols && mkcksum(dentptr->name) == prevcksum) {
682                                 prevcksum = 0xffff;
683                                 dentptr++;
684                                 continue;
685                         }
686 #endif
687                         get_name(dentptr, s_name);
688                         if (dols) {
689                                 int isdir = (dentptr->attr & ATTR_DIR);
690                                 char dirc;
691                                 int doit = 0;
692
693                                 if (isdir) {
694                                         dirs++;
695                                         dirc = '/';
696                                         doit = 1;
697                                 } else {
698                                         dirc = ' ';
699                                         if (s_name[0] != 0) {
700                                                 files++;
701                                                 doit = 1;
702                                         }
703                                 }
704
705                                 if (doit) {
706                                         if (dirc == ' ') {
707                                                 printf(" %8ld   %s%c\n",
708                                                         (long)FAT2CPU32(dentptr->size),
709                                                         s_name, dirc);
710                                         } else {
711                                                 printf("            %s%c\n",
712                                                         s_name, dirc);
713                                         }
714                                 }
715
716                                 dentptr++;
717                                 continue;
718                         }
719
720                         if (strcmp(filename, s_name)
721                             && strcmp(filename, l_name)) {
722                                 debug("Mismatch: |%s|%s|\n", s_name, l_name);
723                                 dentptr++;
724                                 continue;
725                         }
726
727                         memcpy(retdent, dentptr, sizeof(dir_entry));
728
729                         debug("DentName: %s", s_name);
730                         debug(", start: 0x%x", START(dentptr));
731                         debug(", size:  0x%x %s\n",
732                               FAT2CPU32(dentptr->size),
733                               (dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
734
735                         return retdent;
736                 }
737
738                 curclust = get_fatent(mydata, curclust);
739                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
740                         debug("curclust: 0x%x\n", curclust);
741                         printf("Invalid FAT entry\n");
742                         return NULL;
743                 }
744         }
745
746         return NULL;
747 }
748
749 /*
750  * Read boot sector and volume info from a FAT filesystem
751  */
752 static int
753 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
754 {
755         __u8 *block;
756         volume_info *vistart;
757         int ret = 0;
758
759         if (cur_dev == NULL) {
760                 debug("Error: no device selected\n");
761                 return -1;
762         }
763
764         block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz);
765         if (block == NULL) {
766                 debug("Error: allocating block\n");
767                 return -1;
768         }
769
770         if (disk_read(0, 1, block) < 0) {
771                 debug("Error: reading block\n");
772                 goto fail;
773         }
774
775         memcpy(bs, block, sizeof(boot_sector));
776         bs->reserved = FAT2CPU16(bs->reserved);
777         bs->fat_length = FAT2CPU16(bs->fat_length);
778         bs->secs_track = FAT2CPU16(bs->secs_track);
779         bs->heads = FAT2CPU16(bs->heads);
780         bs->total_sect = FAT2CPU32(bs->total_sect);
781
782         /* FAT32 entries */
783         if (bs->fat_length == 0) {
784                 /* Assume FAT32 */
785                 bs->fat32_length = FAT2CPU32(bs->fat32_length);
786                 bs->flags = FAT2CPU16(bs->flags);
787                 bs->root_cluster = FAT2CPU32(bs->root_cluster);
788                 bs->info_sector = FAT2CPU16(bs->info_sector);
789                 bs->backup_boot = FAT2CPU16(bs->backup_boot);
790                 vistart = (volume_info *)(block + sizeof(boot_sector));
791                 *fatsize = 32;
792         } else {
793                 vistart = (volume_info *)&(bs->fat32_length);
794                 *fatsize = 0;
795         }
796         memcpy(volinfo, vistart, sizeof(volume_info));
797
798         if (*fatsize == 32) {
799                 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0)
800                         goto exit;
801         } else {
802                 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
803                         *fatsize = 12;
804                         goto exit;
805                 }
806                 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
807                         *fatsize = 16;
808                         goto exit;
809                 }
810         }
811
812         debug("Error: broken fs_type sign\n");
813 fail:
814         ret = -1;
815 exit:
816         free(block);
817         return ret;
818 }
819
820 __u8 do_fat_read_at_block[MAX_CLUSTSIZE]
821         __aligned(ARCH_DMA_MINALIGN);
822
823 long
824 do_fat_read_at(const char *filename, unsigned long pos, void *buffer,
825                unsigned long maxsize, int dols)
826 {
827         char fnamecopy[2048];
828         boot_sector bs;
829         volume_info volinfo;
830         fsdata datablock;
831         fsdata *mydata = &datablock;
832         dir_entry *dentptr = NULL;
833         __u16 prevcksum = 0xffff;
834         char *subname = "";
835         __u32 cursect;
836         int idx, isdir = 0;
837         int files = 0, dirs = 0;
838         long ret = -1;
839         int firsttime;
840         __u32 root_cluster = 0;
841         int rootdir_size = 0;
842         int j;
843
844         if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
845                 debug("Error: reading boot sector\n");
846                 return -1;
847         }
848
849         if (mydata->fatsize == 32) {
850                 root_cluster = bs.root_cluster;
851                 mydata->fatlength = bs.fat32_length;
852         } else {
853                 mydata->fatlength = bs.fat_length;
854         }
855
856         mydata->fat_sect = bs.reserved;
857
858         cursect = mydata->rootdir_sect
859                 = mydata->fat_sect + mydata->fatlength * bs.fats;
860
861         mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
862         mydata->clust_size = bs.cluster_size;
863         if (mydata->sect_size != cur_part_info.blksz) {
864                 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n",
865                                 mydata->sect_size, cur_part_info.blksz);
866                 return -1;
867         }
868
869         if (mydata->fatsize == 32) {
870                 mydata->data_begin = mydata->rootdir_sect -
871                                         (mydata->clust_size * 2);
872         } else {
873                 rootdir_size = ((bs.dir_entries[1]  * (int)256 +
874                                  bs.dir_entries[0]) *
875                                  sizeof(dir_entry)) /
876                                  mydata->sect_size;
877                 mydata->data_begin = mydata->rootdir_sect +
878                                         rootdir_size -
879                                         (mydata->clust_size * 2);
880         }
881
882         mydata->fatbufnum = -1;
883         mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
884         if (mydata->fatbuf == NULL) {
885                 debug("Error: allocating memory\n");
886                 return -1;
887         }
888
889 #ifdef CONFIG_SUPPORT_VFAT
890         debug("VFAT Support enabled\n");
891 #endif
892         debug("FAT%d, fat_sect: %d, fatlength: %d\n",
893                mydata->fatsize, mydata->fat_sect, mydata->fatlength);
894         debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n"
895                "Data begins at: %d\n",
896                root_cluster,
897                mydata->rootdir_sect,
898                mydata->rootdir_sect * mydata->sect_size, mydata->data_begin);
899         debug("Sector size: %d, cluster size: %d\n", mydata->sect_size,
900               mydata->clust_size);
901
902         /* "cwd" is always the root... */
903         while (ISDIRDELIM(*filename))
904                 filename++;
905
906         /* Make a copy of the filename and convert it to lowercase */
907         strcpy(fnamecopy, filename);
908         downcase(fnamecopy);
909
910         if (*fnamecopy == '\0') {
911                 if (!dols)
912                         goto exit;
913
914                 dols = LS_ROOT;
915         } else if ((idx = dirdelim(fnamecopy)) >= 0) {
916                 isdir = 1;
917                 fnamecopy[idx] = '\0';
918                 subname = fnamecopy + idx + 1;
919
920                 /* Handle multiple delimiters */
921                 while (ISDIRDELIM(*subname))
922                         subname++;
923         } else if (dols) {
924                 isdir = 1;
925         }
926
927         j = 0;
928         while (1) {
929                 int i;
930
931                 if (j == 0) {
932                         debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n",
933                                 cursect, mydata->clust_size, DIRENTSPERBLOCK);
934
935                         if (disk_read(cursect,
936                                         (mydata->fatsize == 32) ?
937                                         (mydata->clust_size) :
938                                         PREFETCH_BLOCKS,
939                                         do_fat_read_at_block) < 0) {
940                                 debug("Error: reading rootdir block\n");
941                                 goto exit;
942                         }
943
944                         dentptr = (dir_entry *) do_fat_read_at_block;
945                 }
946
947                 for (i = 0; i < DIRENTSPERBLOCK; i++) {
948                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
949
950                         l_name[0] = '\0';
951                         if (dentptr->name[0] == DELETED_FLAG) {
952                                 dentptr++;
953                                 continue;
954                         }
955                         if ((dentptr->attr & ATTR_VOLUME)) {
956 #ifdef CONFIG_SUPPORT_VFAT
957                                 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
958                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
959                                         prevcksum =
960                                                 ((dir_slot *)dentptr)->alias_checksum;
961
962                                         get_vfatname(mydata,
963                                                      root_cluster,
964                                                      do_fat_read_at_block,
965                                                      dentptr, l_name);
966
967                                         if (dols == LS_ROOT) {
968                                                 char dirc;
969                                                 int doit = 0;
970                                                 int isdir =
971                                                         (dentptr->attr & ATTR_DIR);
972
973                                                 if (isdir) {
974                                                         dirs++;
975                                                         dirc = '/';
976                                                         doit = 1;
977                                                 } else {
978                                                         dirc = ' ';
979                                                         if (l_name[0] != 0) {
980                                                                 files++;
981                                                                 doit = 1;
982                                                         }
983                                                 }
984                                                 if (doit) {
985                                                         if (dirc == ' ') {
986                                                                 printf(" %8ld   %s%c\n",
987                                                                         (long)FAT2CPU32(dentptr->size),
988                                                                         l_name,
989                                                                         dirc);
990                                                         } else {
991                                                                 printf("            %s%c\n",
992                                                                         l_name,
993                                                                         dirc);
994                                                         }
995                                                 }
996                                                 dentptr++;
997                                                 continue;
998                                         }
999                                         debug("Rootvfatname: |%s|\n",
1000                                                l_name);
1001                                 } else
1002 #endif
1003                                 {
1004                                         /* Volume label or VFAT entry */
1005                                         dentptr++;
1006                                         continue;
1007                                 }
1008                         } else if (dentptr->name[0] == 0) {
1009                                 debug("RootDentname == NULL - %d\n", i);
1010                                 if (dols == LS_ROOT) {
1011                                         printf("\n%d file(s), %d dir(s)\n\n",
1012                                                 files, dirs);
1013                                         ret = 0;
1014                                 }
1015                                 goto exit;
1016                         }
1017 #ifdef CONFIG_SUPPORT_VFAT
1018                         else if (dols == LS_ROOT &&
1019                                  mkcksum(dentptr->name) == prevcksum) {
1020                                 prevcksum = 0xffff;
1021                                 dentptr++;
1022                                 continue;
1023                         }
1024 #endif
1025                         get_name(dentptr, s_name);
1026
1027                         if (dols == LS_ROOT) {
1028                                 int isdir = (dentptr->attr & ATTR_DIR);
1029                                 char dirc;
1030                                 int doit = 0;
1031
1032                                 if (isdir) {
1033                                         dirc = '/';
1034                                         if (s_name[0] != 0) {
1035                                                 dirs++;
1036                                                 doit = 1;
1037                                         }
1038                                 } else {
1039                                         dirc = ' ';
1040                                         if (s_name[0] != 0) {
1041                                                 files++;
1042                                                 doit = 1;
1043                                         }
1044                                 }
1045                                 if (doit) {
1046                                         if (dirc == ' ') {
1047                                                 printf(" %8ld   %s%c\n",
1048                                                         (long)FAT2CPU32(dentptr->size),
1049                                                         s_name, dirc);
1050                                         } else {
1051                                                 printf("            %s%c\n",
1052                                                         s_name, dirc);
1053                                         }
1054                                 }
1055                                 dentptr++;
1056                                 continue;
1057                         }
1058
1059                         if (strcmp(fnamecopy, s_name)
1060                             && strcmp(fnamecopy, l_name)) {
1061                                 debug("RootMismatch: |%s|%s|\n", s_name,
1062                                        l_name);
1063                                 dentptr++;
1064                                 continue;
1065                         }
1066
1067                         if (isdir && !(dentptr->attr & ATTR_DIR))
1068                                 goto exit;
1069
1070                         debug("RootName: %s", s_name);
1071                         debug(", start: 0x%x", START(dentptr));
1072                         debug(", size:  0x%x %s\n",
1073                                FAT2CPU32(dentptr->size),
1074                                isdir ? "(DIR)" : "");
1075
1076                         goto rootdir_done;      /* We got a match */
1077                 }
1078                 debug("END LOOP: j=%d   clust_size=%d\n", j,
1079                        mydata->clust_size);
1080
1081                 /*
1082                  * On FAT32 we must fetch the FAT entries for the next
1083                  * root directory clusters when a cluster has been
1084                  * completely processed.
1085                  */
1086                 ++j;
1087                 int rootdir_end = 0;
1088                 if (mydata->fatsize == 32) {
1089                         if (j == mydata->clust_size) {
1090                                 int nxtsect = 0;
1091                                 int nxt_clust = 0;
1092
1093                                 nxt_clust = get_fatent(mydata, root_cluster);
1094                                 rootdir_end = CHECK_CLUST(nxt_clust, 32);
1095
1096                                 nxtsect = mydata->data_begin +
1097                                         (nxt_clust * mydata->clust_size);
1098
1099                                 root_cluster = nxt_clust;
1100
1101                                 cursect = nxtsect;
1102                                 j = 0;
1103                         }
1104                 } else {
1105                         if (j == PREFETCH_BLOCKS)
1106                                 j = 0;
1107
1108                         rootdir_end = (++cursect - mydata->rootdir_sect >=
1109                                        rootdir_size);
1110                 }
1111
1112                 /* If end of rootdir reached */
1113                 if (rootdir_end) {
1114                         if (dols == LS_ROOT) {
1115                                 printf("\n%d file(s), %d dir(s)\n\n",
1116                                        files, dirs);
1117                                 ret = 0;
1118                         }
1119                         goto exit;
1120                 }
1121         }
1122 rootdir_done:
1123
1124         firsttime = 1;
1125
1126         while (isdir) {
1127                 int startsect = mydata->data_begin
1128                         + START(dentptr) * mydata->clust_size;
1129                 dir_entry dent;
1130                 char *nextname = NULL;
1131
1132                 dent = *dentptr;
1133                 dentptr = &dent;
1134
1135                 idx = dirdelim(subname);
1136
1137                 if (idx >= 0) {
1138                         subname[idx] = '\0';
1139                         nextname = subname + idx + 1;
1140                         /* Handle multiple delimiters */
1141                         while (ISDIRDELIM(*nextname))
1142                                 nextname++;
1143                         if (dols && *nextname == '\0')
1144                                 firsttime = 0;
1145                 } else {
1146                         if (dols && firsttime) {
1147                                 firsttime = 0;
1148                         } else {
1149                                 isdir = 0;
1150                         }
1151                 }
1152
1153                 if (get_dentfromdir(mydata, startsect, subname, dentptr,
1154                                      isdir ? 0 : dols) == NULL) {
1155                         if (dols && !isdir)
1156                                 ret = 0;
1157                         goto exit;
1158                 }
1159
1160                 if (isdir && !(dentptr->attr & ATTR_DIR))
1161                         goto exit;
1162
1163                 if (idx >= 0)
1164                         subname = nextname;
1165         }
1166
1167         ret = get_contents(mydata, dentptr, pos, buffer, maxsize);
1168         debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret);
1169
1170 exit:
1171         free(mydata->fatbuf);
1172         return ret;
1173 }
1174
1175 long
1176 do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
1177 {
1178         return do_fat_read_at(filename, 0, buffer, maxsize, dols);
1179 }
1180
1181 int file_fat_detectfs(void)
1182 {
1183         boot_sector bs;
1184         volume_info volinfo;
1185         int fatsize;
1186         char vol_label[12];
1187
1188         if (cur_dev == NULL) {
1189                 printf("No current device\n");
1190                 return 1;
1191         }
1192
1193 #if defined(CONFIG_CMD_IDE) || \
1194     defined(CONFIG_CMD_SATA) || \
1195     defined(CONFIG_CMD_SCSI) || \
1196     defined(CONFIG_CMD_USB) || \
1197     defined(CONFIG_MMC)
1198         printf("Interface:  ");
1199         switch (cur_dev->if_type) {
1200         case IF_TYPE_IDE:
1201                 printf("IDE");
1202                 break;
1203         case IF_TYPE_SATA:
1204                 printf("SATA");
1205                 break;
1206         case IF_TYPE_SCSI:
1207                 printf("SCSI");
1208                 break;
1209         case IF_TYPE_ATAPI:
1210                 printf("ATAPI");
1211                 break;
1212         case IF_TYPE_USB:
1213                 printf("USB");
1214                 break;
1215         case IF_TYPE_DOC:
1216                 printf("DOC");
1217                 break;
1218         case IF_TYPE_MMC:
1219                 printf("MMC");
1220                 break;
1221         default:
1222                 printf("Unknown");
1223         }
1224
1225         printf("\n  Device %d: ", cur_dev->dev);
1226         dev_print(cur_dev);
1227 #endif
1228
1229         if (read_bootsectandvi(&bs, &volinfo, &fatsize)) {
1230                 printf("\nNo valid FAT fs found\n");
1231                 return 1;
1232         }
1233
1234         memcpy(vol_label, volinfo.volume_label, 11);
1235         vol_label[11] = '\0';
1236         volinfo.fs_type[5] = '\0';
1237
1238         printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part_nr,
1239                 volinfo.fs_type, vol_label);
1240
1241         return 0;
1242 }
1243
1244 int file_fat_ls(const char *dir)
1245 {
1246         return do_fat_read(dir, NULL, 0, LS_YES);
1247 }
1248
1249 long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
1250                       unsigned long maxsize)
1251 {
1252         printf("reading %s\n", filename);
1253         return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO);
1254 }
1255
1256 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
1257 {
1258         return file_fat_read_at(filename, 0, buffer, maxsize);
1259 }