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  • Committer: Phil Dennis-Jordan
  • Date: 2017-07-21 08:03:43 UTC
  • mfrom: (1.1.1)
  • Revision ID: phil@philjordan.eu-20170721080343-2yr2vdj7713czahv
New upstream release 2.9.0.

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roms/u-boot/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
 * SPDX-License-Identifier:     GPL-2.0+
 
10
 */
 
11
 
 
12
#include <common.h>
 
13
#include <config.h>
 
14
#include <exports.h>
 
15
#include <fat.h>
 
16
#include <asm/byteorder.h>
 
17
#include <part.h>
 
18
#include <malloc.h>
 
19
#include <linux/compiler.h>
 
20
#include <linux/ctype.h>
 
21
 
 
22
#ifdef CONFIG_SUPPORT_VFAT
 
23
static const int vfat_enabled = 1;
 
24
#else
 
25
static const int vfat_enabled = 0;
 
26
#endif
 
27
 
 
28
/*
 
29
 * Convert a string to lowercase.
 
30
 */
 
31
static void downcase(char *str)
 
32
{
 
33
        while (*str != '\0') {
 
34
                *str = tolower(*str);
 
35
                str++;
 
36
        }
 
37
}
 
38
 
 
39
static block_dev_desc_t *cur_dev;
 
40
static disk_partition_t cur_part_info;
 
41
 
 
42
#define DOS_BOOT_MAGIC_OFFSET   0x1fe
 
43
#define DOS_FS_TYPE_OFFSET      0x36
 
44
#define DOS_FS32_TYPE_OFFSET    0x52
 
45
 
 
46
static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
 
47
{
 
48
        if (!cur_dev || !cur_dev->block_read)
 
49
                return -1;
 
50
 
 
51
        return cur_dev->block_read(cur_dev->dev,
 
52
                        cur_part_info.start + block, nr_blocks, buf);
 
53
}
 
54
 
 
55
int fat_set_blk_dev(block_dev_desc_t *dev_desc, disk_partition_t *info)
 
56
{
 
57
        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 
58
 
 
59
        cur_dev = dev_desc;
 
60
        cur_part_info = *info;
 
61
 
 
62
        /* Make sure it has a valid FAT header */
 
63
        if (disk_read(0, 1, buffer) != 1) {
 
64
                cur_dev = NULL;
 
65
                return -1;
 
66
        }
 
67
 
 
68
        /* Check if it's actually a DOS volume */
 
69
        if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) {
 
70
                cur_dev = NULL;
 
71
                return -1;
 
72
        }
 
73
 
 
74
        /* Check for FAT12/FAT16/FAT32 filesystem */
 
75
        if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3))
 
76
                return 0;
 
77
        if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5))
 
78
                return 0;
 
79
 
 
80
        cur_dev = NULL;
 
81
        return -1;
 
82
}
 
83
 
 
84
int fat_register_device(block_dev_desc_t *dev_desc, int part_no)
 
85
{
 
86
        disk_partition_t info;
 
87
 
 
88
        /* First close any currently found FAT filesystem */
 
89
        cur_dev = NULL;
 
90
 
 
91
        /* Read the partition table, if present */
 
92
        if (get_partition_info(dev_desc, part_no, &info)) {
 
93
                if (part_no != 0) {
 
94
                        printf("** Partition %d not valid on device %d **\n",
 
95
                                        part_no, dev_desc->dev);
 
96
                        return -1;
 
97
                }
 
98
 
 
99
                info.start = 0;
 
100
                info.size = dev_desc->lba;
 
101
                info.blksz = dev_desc->blksz;
 
102
                info.name[0] = 0;
 
103
                info.type[0] = 0;
 
104
                info.bootable = 0;
 
105
#ifdef CONFIG_PARTITION_UUIDS
 
106
                info.uuid[0] = 0;
 
107
#endif
 
108
        }
 
109
 
 
110
        return fat_set_blk_dev(dev_desc, &info);
 
111
}
 
112
 
 
113
/*
 
114
 * Get the first occurence of a directory delimiter ('/' or '\') in a string.
 
115
 * Return index into string if found, -1 otherwise.
 
116
 */
 
117
static int dirdelim(char *str)
 
118
{
 
119
        char *start = str;
 
120
 
 
121
        while (*str != '\0') {
 
122
                if (ISDIRDELIM(*str))
 
123
                        return str - start;
 
124
                str++;
 
125
        }
 
126
        return -1;
 
127
}
 
128
 
 
129
/*
 
130
 * Extract zero terminated short name from a directory entry.
 
131
 */
 
132
static void get_name(dir_entry *dirent, char *s_name)
 
133
{
 
134
        char *ptr;
 
135
 
 
136
        memcpy(s_name, dirent->name, 8);
 
137
        s_name[8] = '\0';
 
138
        ptr = s_name;
 
139
        while (*ptr && *ptr != ' ')
 
140
                ptr++;
 
141
        if (dirent->ext[0] && dirent->ext[0] != ' ') {
 
142
                *ptr = '.';
 
143
                ptr++;
 
144
                memcpy(ptr, dirent->ext, 3);
 
145
                ptr[3] = '\0';
 
146
                while (*ptr && *ptr != ' ')
 
147
                        ptr++;
 
148
        }
 
149
        *ptr = '\0';
 
150
        if (*s_name == DELETED_FLAG)
 
151
                *s_name = '\0';
 
152
        else if (*s_name == aRING)
 
153
                *s_name = DELETED_FLAG;
 
154
        downcase(s_name);
 
155
}
 
156
 
 
157
/*
 
158
 * Get the entry at index 'entry' in a FAT (12/16/32) table.
 
159
 * On failure 0x00 is returned.
 
160
 */
 
161
static __u32 get_fatent(fsdata *mydata, __u32 entry)
 
162
{
 
163
        __u32 bufnum;
 
164
        __u32 off16, offset;
 
165
        __u32 ret = 0x00;
 
166
        __u16 val1, val2;
 
167
 
 
168
        switch (mydata->fatsize) {
 
169
        case 32:
 
170
                bufnum = entry / FAT32BUFSIZE;
 
171
                offset = entry - bufnum * FAT32BUFSIZE;
 
172
                break;
 
173
        case 16:
 
174
                bufnum = entry / FAT16BUFSIZE;
 
175
                offset = entry - bufnum * FAT16BUFSIZE;
 
176
                break;
 
177
        case 12:
 
178
                bufnum = entry / FAT12BUFSIZE;
 
179
                offset = entry - bufnum * FAT12BUFSIZE;
 
180
                break;
 
181
 
 
182
        default:
 
183
                /* Unsupported FAT size */
 
184
                return ret;
 
185
        }
 
186
 
 
187
        debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
 
188
               mydata->fatsize, entry, entry, offset, offset);
 
189
 
 
190
        /* Read a new block of FAT entries into the cache. */
 
191
        if (bufnum != mydata->fatbufnum) {
 
192
                __u32 getsize = FATBUFBLOCKS;
 
193
                __u8 *bufptr = mydata->fatbuf;
 
194
                __u32 fatlength = mydata->fatlength;
 
195
                __u32 startblock = bufnum * FATBUFBLOCKS;
 
196
 
 
197
                if (startblock + getsize > fatlength)
 
198
                        getsize = fatlength - startblock;
 
199
 
 
200
                startblock += mydata->fat_sect; /* Offset from start of disk */
 
201
 
 
202
                if (disk_read(startblock, getsize, bufptr) < 0) {
 
203
                        debug("Error reading FAT blocks\n");
 
204
                        return ret;
 
205
                }
 
206
                mydata->fatbufnum = bufnum;
 
207
        }
 
208
 
 
209
        /* Get the actual entry from the table */
 
210
        switch (mydata->fatsize) {
 
211
        case 32:
 
212
                ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
 
213
                break;
 
214
        case 16:
 
215
                ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
 
216
                break;
 
217
        case 12:
 
218
                off16 = (offset * 3) / 4;
 
219
 
 
220
                switch (offset & 0x3) {
 
221
                case 0:
 
222
                        ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
 
223
                        ret &= 0xfff;
 
224
                        break;
 
225
                case 1:
 
226
                        val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 
227
                        val1 &= 0xf000;
 
228
                        val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
 
229
                        val2 &= 0x00ff;
 
230
                        ret = (val2 << 4) | (val1 >> 12);
 
231
                        break;
 
232
                case 2:
 
233
                        val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 
234
                        val1 &= 0xff00;
 
235
                        val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
 
236
                        val2 &= 0x000f;
 
237
                        ret = (val2 << 8) | (val1 >> 8);
 
238
                        break;
 
239
                case 3:
 
240
                        ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 
241
                        ret = (ret & 0xfff0) >> 4;
 
242
                        break;
 
243
                default:
 
244
                        break;
 
245
                }
 
246
                break;
 
247
        }
 
248
        debug("FAT%d: ret: %08x, offset: %04x\n",
 
249
               mydata->fatsize, ret, offset);
 
250
 
 
251
        return ret;
 
252
}
 
253
 
 
254
/*
 
255
 * Read at most 'size' bytes from the specified cluster into 'buffer'.
 
256
 * Return 0 on success, -1 otherwise.
 
257
 */
 
258
static int
 
259
get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
 
260
{
 
261
        __u32 idx = 0;
 
262
        __u32 startsect;
 
263
        int ret;
 
264
 
 
265
        if (clustnum > 0) {
 
266
                startsect = mydata->data_begin +
 
267
                                clustnum * mydata->clust_size;
 
268
        } else {
 
269
                startsect = mydata->rootdir_sect;
 
270
        }
 
271
 
 
272
        debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
 
273
 
 
274
        if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
 
275
                ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
 
276
 
 
277
                printf("FAT: Misaligned buffer address (%p)\n", buffer);
 
278
 
 
279
                while (size >= mydata->sect_size) {
 
280
                        ret = disk_read(startsect++, 1, tmpbuf);
 
281
                        if (ret != 1) {
 
282
                                debug("Error reading data (got %d)\n", ret);
 
283
                                return -1;
 
284
                        }
 
285
 
 
286
                        memcpy(buffer, tmpbuf, mydata->sect_size);
 
287
                        buffer += mydata->sect_size;
 
288
                        size -= mydata->sect_size;
 
289
                }
 
290
        } else {
 
291
                idx = size / mydata->sect_size;
 
292
                ret = disk_read(startsect, idx, buffer);
 
293
                if (ret != idx) {
 
294
                        debug("Error reading data (got %d)\n", ret);
 
295
                        return -1;
 
296
                }
 
297
                startsect += idx;
 
298
                idx *= mydata->sect_size;
 
299
                buffer += idx;
 
300
                size -= idx;
 
301
        }
 
302
        if (size) {
 
303
                ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
 
304
 
 
305
                ret = disk_read(startsect, 1, tmpbuf);
 
306
                if (ret != 1) {
 
307
                        debug("Error reading data (got %d)\n", ret);
 
308
                        return -1;
 
309
                }
 
310
 
 
311
                memcpy(buffer, tmpbuf, size);
 
312
        }
 
313
 
 
314
        return 0;
 
315
}
 
316
 
 
317
/*
 
318
 * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr'
 
319
 * into 'buffer'.
 
320
 * Return the number of bytes read or -1 on fatal errors.
 
321
 */
 
322
__u8 get_contents_vfatname_block[MAX_CLUSTSIZE]
 
323
        __aligned(ARCH_DMA_MINALIGN);
 
324
 
 
325
static long
 
326
get_contents(fsdata *mydata, dir_entry *dentptr, unsigned long pos,
 
327
             __u8 *buffer, unsigned long maxsize)
 
328
{
 
329
        unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
 
330
        unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
 
331
        __u32 curclust = START(dentptr);
 
332
        __u32 endclust, newclust;
 
333
        unsigned long actsize;
 
334
 
 
335
        debug("Filesize: %ld bytes\n", filesize);
 
336
 
 
337
        if (pos >= filesize) {
 
338
                debug("Read position past EOF: %lu\n", pos);
 
339
                return gotsize;
 
340
        }
 
341
 
 
342
        if (maxsize > 0 && filesize > pos + maxsize)
 
343
                filesize = pos + maxsize;
 
344
 
 
345
        debug("%ld bytes\n", filesize);
 
346
 
 
347
        actsize = bytesperclust;
 
348
 
 
349
        /* go to cluster at pos */
 
350
        while (actsize <= pos) {
 
351
                curclust = get_fatent(mydata, curclust);
 
352
                if (CHECK_CLUST(curclust, mydata->fatsize)) {
 
353
                        debug("curclust: 0x%x\n", curclust);
 
354
                        debug("Invalid FAT entry\n");
 
355
                        return gotsize;
 
356
                }
 
357
                actsize += bytesperclust;
 
358
        }
 
359
 
 
360
        /* actsize > pos */
 
361
        actsize -= bytesperclust;
 
362
        filesize -= actsize;
 
363
        pos -= actsize;
 
364
 
 
365
        /* align to beginning of next cluster if any */
 
366
        if (pos) {
 
367
                actsize = min(filesize, bytesperclust);
 
368
                if (get_cluster(mydata, curclust, get_contents_vfatname_block,
 
369
                                (int)actsize) != 0) {
 
370
                        printf("Error reading cluster\n");
 
371
                        return -1;
 
372
                }
 
373
                filesize -= actsize;
 
374
                actsize -= pos;
 
375
                memcpy(buffer, get_contents_vfatname_block + pos, actsize);
 
376
                gotsize += actsize;
 
377
                if (!filesize)
 
378
                        return gotsize;
 
379
                buffer += actsize;
 
380
 
 
381
                curclust = get_fatent(mydata, curclust);
 
382
                if (CHECK_CLUST(curclust, mydata->fatsize)) {
 
383
                        debug("curclust: 0x%x\n", curclust);
 
384
                        debug("Invalid FAT entry\n");
 
385
                        return gotsize;
 
386
                }
 
387
        }
 
388
 
 
389
        actsize = bytesperclust;
 
390
        endclust = curclust;
 
391
 
 
392
        do {
 
393
                /* search for consecutive clusters */
 
394
                while (actsize < filesize) {
 
395
                        newclust = get_fatent(mydata, endclust);
 
396
                        if ((newclust - 1) != endclust)
 
397
                                goto getit;
 
398
                        if (CHECK_CLUST(newclust, mydata->fatsize)) {
 
399
                                debug("curclust: 0x%x\n", newclust);
 
400
                                debug("Invalid FAT entry\n");
 
401
                                return gotsize;
 
402
                        }
 
403
                        endclust = newclust;
 
404
                        actsize += bytesperclust;
 
405
                }
 
406
 
 
407
                /* get remaining bytes */
 
408
                actsize = filesize;
 
409
                if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 
410
                        printf("Error reading cluster\n");
 
411
                        return -1;
 
412
                }
 
413
                gotsize += actsize;
 
414
                return gotsize;
 
415
getit:
 
416
                if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 
417
                        printf("Error reading cluster\n");
 
418
                        return -1;
 
419
                }
 
420
                gotsize += (int)actsize;
 
421
                filesize -= actsize;
 
422
                buffer += actsize;
 
423
 
 
424
                curclust = get_fatent(mydata, endclust);
 
425
                if (CHECK_CLUST(curclust, mydata->fatsize)) {
 
426
                        debug("curclust: 0x%x\n", curclust);
 
427
                        printf("Invalid FAT entry\n");
 
428
                        return gotsize;
 
429
                }
 
430
                actsize = bytesperclust;
 
431
                endclust = curclust;
 
432
        } while (1);
 
433
}
 
434
 
 
435
/*
 
436
 * Extract the file name information from 'slotptr' into 'l_name',
 
437
 * starting at l_name[*idx].
 
438
 * Return 1 if terminator (zero byte) is found, 0 otherwise.
 
439
 */
 
440
static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
 
441
{
 
442
        int j;
 
443
 
 
444
        for (j = 0; j <= 8; j += 2) {
 
445
                l_name[*idx] = slotptr->name0_4[j];
 
446
                if (l_name[*idx] == 0x00)
 
447
                        return 1;
 
448
                (*idx)++;
 
449
        }
 
450
        for (j = 0; j <= 10; j += 2) {
 
451
                l_name[*idx] = slotptr->name5_10[j];
 
452
                if (l_name[*idx] == 0x00)
 
453
                        return 1;
 
454
                (*idx)++;
 
455
        }
 
456
        for (j = 0; j <= 2; j += 2) {
 
457
                l_name[*idx] = slotptr->name11_12[j];
 
458
                if (l_name[*idx] == 0x00)
 
459
                        return 1;
 
460
                (*idx)++;
 
461
        }
 
462
 
 
463
        return 0;
 
464
}
 
465
 
 
466
/*
 
467
 * Extract the full long filename starting at 'retdent' (which is really
 
468
 * a slot) into 'l_name'. If successful also copy the real directory entry
 
469
 * into 'retdent'
 
470
 * Return 0 on success, -1 otherwise.
 
471
 */
 
472
static int
 
473
get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
 
474
             dir_entry *retdent, char *l_name)
 
475
{
 
476
        dir_entry *realdent;
 
477
        dir_slot *slotptr = (dir_slot *)retdent;
 
478
        __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
 
479
                                                        PREFETCH_BLOCKS :
 
480
                                                        mydata->clust_size);
 
481
        __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
 
482
        int idx = 0;
 
483
 
 
484
        if (counter > VFAT_MAXSEQ) {
 
485
                debug("Error: VFAT name is too long\n");
 
486
                return -1;
 
487
        }
 
488
 
 
489
        while ((__u8 *)slotptr < buflimit) {
 
490
                if (counter == 0)
 
491
                        break;
 
492
                if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
 
493
                        return -1;
 
494
                slotptr++;
 
495
                counter--;
 
496
        }
 
497
 
 
498
        if ((__u8 *)slotptr >= buflimit) {
 
499
                dir_slot *slotptr2;
 
500
 
 
501
                if (curclust == 0)
 
502
                        return -1;
 
503
                curclust = get_fatent(mydata, curclust);
 
504
                if (CHECK_CLUST(curclust, mydata->fatsize)) {
 
505
                        debug("curclust: 0x%x\n", curclust);
 
506
                        printf("Invalid FAT entry\n");
 
507
                        return -1;
 
508
                }
 
509
 
 
510
                if (get_cluster(mydata, curclust, get_contents_vfatname_block,
 
511
                                mydata->clust_size * mydata->sect_size) != 0) {
 
512
                        debug("Error: reading directory block\n");
 
513
                        return -1;
 
514
                }
 
515
 
 
516
                slotptr2 = (dir_slot *)get_contents_vfatname_block;
 
517
                while (counter > 0) {
 
518
                        if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
 
519
                            & 0xff) != counter)
 
520
                                return -1;
 
521
                        slotptr2++;
 
522
                        counter--;
 
523
                }
 
524
 
 
525
                /* Save the real directory entry */
 
526
                realdent = (dir_entry *)slotptr2;
 
527
                while ((__u8 *)slotptr2 > get_contents_vfatname_block) {
 
528
                        slotptr2--;
 
529
                        slot2str(slotptr2, l_name, &idx);
 
530
                }
 
531
        } else {
 
532
                /* Save the real directory entry */
 
533
                realdent = (dir_entry *)slotptr;
 
534
        }
 
535
 
 
536
        do {
 
537
                slotptr--;
 
538
                if (slot2str(slotptr, l_name, &idx))
 
539
                        break;
 
540
        } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
 
541
 
 
542
        l_name[idx] = '\0';
 
543
        if (*l_name == DELETED_FLAG)
 
544
                *l_name = '\0';
 
545
        else if (*l_name == aRING)
 
546
                *l_name = DELETED_FLAG;
 
547
        downcase(l_name);
 
548
 
 
549
        /* Return the real directory entry */
 
550
        memcpy(retdent, realdent, sizeof(dir_entry));
 
551
 
 
552
        return 0;
 
553
}
 
554
 
 
555
/* Calculate short name checksum */
 
556
static __u8 mkcksum(const char name[8], const char ext[3])
 
557
{
 
558
        int i;
 
559
 
 
560
        __u8 ret = 0;
 
561
 
 
562
        for (i = 0; i < 8; i++)
 
563
                ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i];
 
564
        for (i = 0; i < 3; i++)
 
565
                ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i];
 
566
 
 
567
        return ret;
 
568
}
 
569
 
 
570
/*
 
571
 * Get the directory entry associated with 'filename' from the directory
 
572
 * starting at 'startsect'
 
573
 */
 
574
__u8 get_dentfromdir_block[MAX_CLUSTSIZE]
 
575
        __aligned(ARCH_DMA_MINALIGN);
 
576
 
 
577
static dir_entry *get_dentfromdir(fsdata *mydata, int startsect,
 
578
                                  char *filename, dir_entry *retdent,
 
579
                                  int dols)
 
580
{
 
581
        __u16 prevcksum = 0xffff;
 
582
        __u32 curclust = START(retdent);
 
583
        int files = 0, dirs = 0;
 
584
 
 
585
        debug("get_dentfromdir: %s\n", filename);
 
586
 
 
587
        while (1) {
 
588
                dir_entry *dentptr;
 
589
 
 
590
                int i;
 
591
 
 
592
                if (get_cluster(mydata, curclust, get_dentfromdir_block,
 
593
                                mydata->clust_size * mydata->sect_size) != 0) {
 
594
                        debug("Error: reading directory block\n");
 
595
                        return NULL;
 
596
                }
 
597
 
 
598
                dentptr = (dir_entry *)get_dentfromdir_block;
 
599
 
 
600
                for (i = 0; i < DIRENTSPERCLUST; i++) {
 
601
                        char s_name[14], l_name[VFAT_MAXLEN_BYTES];
 
602
 
 
603
                        l_name[0] = '\0';
 
604
                        if (dentptr->name[0] == DELETED_FLAG) {
 
605
                                dentptr++;
 
606
                                continue;
 
607
                        }
 
608
                        if ((dentptr->attr & ATTR_VOLUME)) {
 
609
                                if (vfat_enabled &&
 
610
                                    (dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
 
611
                                    (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 
612
                                        prevcksum = ((dir_slot *)dentptr)->alias_checksum;
 
613
                                        get_vfatname(mydata, curclust,
 
614
                                                     get_dentfromdir_block,
 
615
                                                     dentptr, l_name);
 
616
                                        if (dols) {
 
617
                                                int isdir;
 
618
                                                char dirc;
 
619
                                                int doit = 0;
 
620
 
 
621
                                                isdir = (dentptr->attr & ATTR_DIR);
 
622
 
 
623
                                                if (isdir) {
 
624
                                                        dirs++;
 
625
                                                        dirc = '/';
 
626
                                                        doit = 1;
 
627
                                                } else {
 
628
                                                        dirc = ' ';
 
629
                                                        if (l_name[0] != 0) {
 
630
                                                                files++;
 
631
                                                                doit = 1;
 
632
                                                        }
 
633
                                                }
 
634
                                                if (doit) {
 
635
                                                        if (dirc == ' ') {
 
636
                                                                printf(" %8ld   %s%c\n",
 
637
                                                                        (long)FAT2CPU32(dentptr->size),
 
638
                                                                        l_name,
 
639
                                                                        dirc);
 
640
                                                        } else {
 
641
                                                                printf("            %s%c\n",
 
642
                                                                        l_name,
 
643
                                                                        dirc);
 
644
                                                        }
 
645
                                                }
 
646
                                                dentptr++;
 
647
                                                continue;
 
648
                                        }
 
649
                                        debug("vfatname: |%s|\n", l_name);
 
650
                                } else {
 
651
                                        /* Volume label or VFAT entry */
 
652
                                        dentptr++;
 
653
                                        continue;
 
654
                                }
 
655
                        }
 
656
                        if (dentptr->name[0] == 0) {
 
657
                                if (dols) {
 
658
                                        printf("\n%d file(s), %d dir(s)\n\n",
 
659
                                                files, dirs);
 
660
                                }
 
661
                                debug("Dentname == NULL - %d\n", i);
 
662
                                return NULL;
 
663
                        }
 
664
                        if (vfat_enabled) {
 
665
                                __u8 csum = mkcksum(dentptr->name, dentptr->ext);
 
666
                                if (dols && csum == prevcksum) {
 
667
                                        prevcksum = 0xffff;
 
668
                                        dentptr++;
 
669
                                        continue;
 
670
                                }
 
671
                        }
 
672
 
 
673
                        get_name(dentptr, s_name);
 
674
                        if (dols) {
 
675
                                int isdir = (dentptr->attr & ATTR_DIR);
 
676
                                char dirc;
 
677
                                int doit = 0;
 
678
 
 
679
                                if (isdir) {
 
680
                                        dirs++;
 
681
                                        dirc = '/';
 
682
                                        doit = 1;
 
683
                                } else {
 
684
                                        dirc = ' ';
 
685
                                        if (s_name[0] != 0) {
 
686
                                                files++;
 
687
                                                doit = 1;
 
688
                                        }
 
689
                                }
 
690
 
 
691
                                if (doit) {
 
692
                                        if (dirc == ' ') {
 
693
                                                printf(" %8ld   %s%c\n",
 
694
                                                        (long)FAT2CPU32(dentptr->size),
 
695
                                                        s_name, dirc);
 
696
                                        } else {
 
697
                                                printf("            %s%c\n",
 
698
                                                        s_name, dirc);
 
699
                                        }
 
700
                                }
 
701
 
 
702
                                dentptr++;
 
703
                                continue;
 
704
                        }
 
705
 
 
706
                        if (strcmp(filename, s_name)
 
707
                            && strcmp(filename, l_name)) {
 
708
                                debug("Mismatch: |%s|%s|\n", s_name, l_name);
 
709
                                dentptr++;
 
710
                                continue;
 
711
                        }
 
712
 
 
713
                        memcpy(retdent, dentptr, sizeof(dir_entry));
 
714
 
 
715
                        debug("DentName: %s", s_name);
 
716
                        debug(", start: 0x%x", START(dentptr));
 
717
                        debug(", size:  0x%x %s\n",
 
718
                              FAT2CPU32(dentptr->size),
 
719
                              (dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
 
720
 
 
721
                        return retdent;
 
722
                }
 
723
 
 
724
                curclust = get_fatent(mydata, curclust);
 
725
                if (CHECK_CLUST(curclust, mydata->fatsize)) {
 
726
                        debug("curclust: 0x%x\n", curclust);
 
727
                        printf("Invalid FAT entry\n");
 
728
                        return NULL;
 
729
                }
 
730
        }
 
731
 
 
732
        return NULL;
 
733
}
 
734
 
 
735
/*
 
736
 * Read boot sector and volume info from a FAT filesystem
 
737
 */
 
738
static int
 
739
read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
 
740
{
 
741
        __u8 *block;
 
742
        volume_info *vistart;
 
743
        int ret = 0;
 
744
 
 
745
        if (cur_dev == NULL) {
 
746
                debug("Error: no device selected\n");
 
747
                return -1;
 
748
        }
 
749
 
 
750
        block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz);
 
751
        if (block == NULL) {
 
752
                debug("Error: allocating block\n");
 
753
                return -1;
 
754
        }
 
755
 
 
756
        if (disk_read(0, 1, block) < 0) {
 
757
                debug("Error: reading block\n");
 
758
                goto fail;
 
759
        }
 
760
 
 
761
        memcpy(bs, block, sizeof(boot_sector));
 
762
        bs->reserved = FAT2CPU16(bs->reserved);
 
763
        bs->fat_length = FAT2CPU16(bs->fat_length);
 
764
        bs->secs_track = FAT2CPU16(bs->secs_track);
 
765
        bs->heads = FAT2CPU16(bs->heads);
 
766
        bs->total_sect = FAT2CPU32(bs->total_sect);
 
767
 
 
768
        /* FAT32 entries */
 
769
        if (bs->fat_length == 0) {
 
770
                /* Assume FAT32 */
 
771
                bs->fat32_length = FAT2CPU32(bs->fat32_length);
 
772
                bs->flags = FAT2CPU16(bs->flags);
 
773
                bs->root_cluster = FAT2CPU32(bs->root_cluster);
 
774
                bs->info_sector = FAT2CPU16(bs->info_sector);
 
775
                bs->backup_boot = FAT2CPU16(bs->backup_boot);
 
776
                vistart = (volume_info *)(block + sizeof(boot_sector));
 
777
                *fatsize = 32;
 
778
        } else {
 
779
                vistart = (volume_info *)&(bs->fat32_length);
 
780
                *fatsize = 0;
 
781
        }
 
782
        memcpy(volinfo, vistart, sizeof(volume_info));
 
783
 
 
784
        if (*fatsize == 32) {
 
785
                if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0)
 
786
                        goto exit;
 
787
        } else {
 
788
                if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
 
789
                        *fatsize = 12;
 
790
                        goto exit;
 
791
                }
 
792
                if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
 
793
                        *fatsize = 16;
 
794
                        goto exit;
 
795
                }
 
796
        }
 
797
 
 
798
        debug("Error: broken fs_type sign\n");
 
799
fail:
 
800
        ret = -1;
 
801
exit:
 
802
        free(block);
 
803
        return ret;
 
804
}
 
805
 
 
806
__u8 do_fat_read_at_block[MAX_CLUSTSIZE]
 
807
        __aligned(ARCH_DMA_MINALIGN);
 
808
 
 
809
long
 
810
do_fat_read_at(const char *filename, unsigned long pos, void *buffer,
 
811
               unsigned long maxsize, int dols, int dogetsize)
 
812
{
 
813
        char fnamecopy[2048];
 
814
        boot_sector bs;
 
815
        volume_info volinfo;
 
816
        fsdata datablock;
 
817
        fsdata *mydata = &datablock;
 
818
        dir_entry *dentptr = NULL;
 
819
        __u16 prevcksum = 0xffff;
 
820
        char *subname = "";
 
821
        __u32 cursect;
 
822
        int idx, isdir = 0;
 
823
        int files = 0, dirs = 0;
 
824
        long ret = -1;
 
825
        int firsttime;
 
826
        __u32 root_cluster = 0;
 
827
        int rootdir_size = 0;
 
828
        int j;
 
829
 
 
830
        if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
 
831
                debug("Error: reading boot sector\n");
 
832
                return -1;
 
833
        }
 
834
 
 
835
        if (mydata->fatsize == 32) {
 
836
                root_cluster = bs.root_cluster;
 
837
                mydata->fatlength = bs.fat32_length;
 
838
        } else {
 
839
                mydata->fatlength = bs.fat_length;
 
840
        }
 
841
 
 
842
        mydata->fat_sect = bs.reserved;
 
843
 
 
844
        cursect = mydata->rootdir_sect
 
845
                = mydata->fat_sect + mydata->fatlength * bs.fats;
 
846
 
 
847
        mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
 
848
        mydata->clust_size = bs.cluster_size;
 
849
        if (mydata->sect_size != cur_part_info.blksz) {
 
850
                printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n",
 
851
                                mydata->sect_size, cur_part_info.blksz);
 
852
                return -1;
 
853
        }
 
854
 
 
855
        if (mydata->fatsize == 32) {
 
856
                mydata->data_begin = mydata->rootdir_sect -
 
857
                                        (mydata->clust_size * 2);
 
858
        } else {
 
859
                rootdir_size = ((bs.dir_entries[1]  * (int)256 +
 
860
                                 bs.dir_entries[0]) *
 
861
                                 sizeof(dir_entry)) /
 
862
                                 mydata->sect_size;
 
863
                mydata->data_begin = mydata->rootdir_sect +
 
864
                                        rootdir_size -
 
865
                                        (mydata->clust_size * 2);
 
866
        }
 
867
 
 
868
        mydata->fatbufnum = -1;
 
869
        mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
 
870
        if (mydata->fatbuf == NULL) {
 
871
                debug("Error: allocating memory\n");
 
872
                return -1;
 
873
        }
 
874
 
 
875
        if (vfat_enabled)
 
876
                debug("VFAT Support enabled\n");
 
877
 
 
878
        debug("FAT%d, fat_sect: %d, fatlength: %d\n",
 
879
               mydata->fatsize, mydata->fat_sect, mydata->fatlength);
 
880
        debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n"
 
881
               "Data begins at: %d\n",
 
882
               root_cluster,
 
883
               mydata->rootdir_sect,
 
884
               mydata->rootdir_sect * mydata->sect_size, mydata->data_begin);
 
885
        debug("Sector size: %d, cluster size: %d\n", mydata->sect_size,
 
886
              mydata->clust_size);
 
887
 
 
888
        /* "cwd" is always the root... */
 
889
        while (ISDIRDELIM(*filename))
 
890
                filename++;
 
891
 
 
892
        /* Make a copy of the filename and convert it to lowercase */
 
893
        strcpy(fnamecopy, filename);
 
894
        downcase(fnamecopy);
 
895
 
 
896
        if (*fnamecopy == '\0') {
 
897
                if (!dols)
 
898
                        goto exit;
 
899
 
 
900
                dols = LS_ROOT;
 
901
        } else if ((idx = dirdelim(fnamecopy)) >= 0) {
 
902
                isdir = 1;
 
903
                fnamecopy[idx] = '\0';
 
904
                subname = fnamecopy + idx + 1;
 
905
 
 
906
                /* Handle multiple delimiters */
 
907
                while (ISDIRDELIM(*subname))
 
908
                        subname++;
 
909
        } else if (dols) {
 
910
                isdir = 1;
 
911
        }
 
912
 
 
913
        j = 0;
 
914
        while (1) {
 
915
                int i;
 
916
 
 
917
                if (j == 0) {
 
918
                        debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n",
 
919
                                cursect, mydata->clust_size, DIRENTSPERBLOCK);
 
920
 
 
921
                        if (disk_read(cursect,
 
922
                                        (mydata->fatsize == 32) ?
 
923
                                        (mydata->clust_size) :
 
924
                                        PREFETCH_BLOCKS,
 
925
                                        do_fat_read_at_block) < 0) {
 
926
                                debug("Error: reading rootdir block\n");
 
927
                                goto exit;
 
928
                        }
 
929
 
 
930
                        dentptr = (dir_entry *) do_fat_read_at_block;
 
931
                }
 
932
 
 
933
                for (i = 0; i < DIRENTSPERBLOCK; i++) {
 
934
                        char s_name[14], l_name[VFAT_MAXLEN_BYTES];
 
935
                        __u8 csum;
 
936
 
 
937
                        l_name[0] = '\0';
 
938
                        if (dentptr->name[0] == DELETED_FLAG) {
 
939
                                dentptr++;
 
940
                                continue;
 
941
                        }
 
942
 
 
943
                        if (vfat_enabled)
 
944
                                csum = mkcksum(dentptr->name, dentptr->ext);
 
945
 
 
946
                        if (dentptr->attr & ATTR_VOLUME) {
 
947
                                if (vfat_enabled &&
 
948
                                    (dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
 
949
                                    (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 
950
                                        prevcksum =
 
951
                                                ((dir_slot *)dentptr)->alias_checksum;
 
952
 
 
953
                                        get_vfatname(mydata,
 
954
                                                     root_cluster,
 
955
                                                     do_fat_read_at_block,
 
956
                                                     dentptr, l_name);
 
957
 
 
958
                                        if (dols == LS_ROOT) {
 
959
                                                char dirc;
 
960
                                                int doit = 0;
 
961
                                                int isdir =
 
962
                                                        (dentptr->attr & ATTR_DIR);
 
963
 
 
964
                                                if (isdir) {
 
965
                                                        dirs++;
 
966
                                                        dirc = '/';
 
967
                                                        doit = 1;
 
968
                                                } else {
 
969
                                                        dirc = ' ';
 
970
                                                        if (l_name[0] != 0) {
 
971
                                                                files++;
 
972
                                                                doit = 1;
 
973
                                                        }
 
974
                                                }
 
975
                                                if (doit) {
 
976
                                                        if (dirc == ' ') {
 
977
                                                                printf(" %8ld   %s%c\n",
 
978
                                                                        (long)FAT2CPU32(dentptr->size),
 
979
                                                                        l_name,
 
980
                                                                        dirc);
 
981
                                                        } else {
 
982
                                                                printf("            %s%c\n",
 
983
                                                                        l_name,
 
984
                                                                        dirc);
 
985
                                                        }
 
986
                                                }
 
987
                                                dentptr++;
 
988
                                                continue;
 
989
                                        }
 
990
                                        debug("Rootvfatname: |%s|\n",
 
991
                                               l_name);
 
992
                                } else {
 
993
                                        /* Volume label or VFAT entry */
 
994
                                        dentptr++;
 
995
                                        continue;
 
996
                                }
 
997
                        } else if (dentptr->name[0] == 0) {
 
998
                                debug("RootDentname == NULL - %d\n", i);
 
999
                                if (dols == LS_ROOT) {
 
1000
                                        printf("\n%d file(s), %d dir(s)\n\n",
 
1001
                                                files, dirs);
 
1002
                                        ret = 0;
 
1003
                                }
 
1004
                                goto exit;
 
1005
                        }
 
1006
                        else if (vfat_enabled &&
 
1007
                                 dols == LS_ROOT && csum == prevcksum) {
 
1008
                                prevcksum = 0xffff;
 
1009
                                dentptr++;
 
1010
                                continue;
 
1011
                        }
 
1012
 
 
1013
                        get_name(dentptr, s_name);
 
1014
 
 
1015
                        if (dols == LS_ROOT) {
 
1016
                                int isdir = (dentptr->attr & ATTR_DIR);
 
1017
                                char dirc;
 
1018
                                int doit = 0;
 
1019
 
 
1020
                                if (isdir) {
 
1021
                                        dirc = '/';
 
1022
                                        if (s_name[0] != 0) {
 
1023
                                                dirs++;
 
1024
                                                doit = 1;
 
1025
                                        }
 
1026
                                } else {
 
1027
                                        dirc = ' ';
 
1028
                                        if (s_name[0] != 0) {
 
1029
                                                files++;
 
1030
                                                doit = 1;
 
1031
                                        }
 
1032
                                }
 
1033
                                if (doit) {
 
1034
                                        if (dirc == ' ') {
 
1035
                                                printf(" %8ld   %s%c\n",
 
1036
                                                        (long)FAT2CPU32(dentptr->size),
 
1037
                                                        s_name, dirc);
 
1038
                                        } else {
 
1039
                                                printf("            %s%c\n",
 
1040
                                                        s_name, dirc);
 
1041
                                        }
 
1042
                                }
 
1043
                                dentptr++;
 
1044
                                continue;
 
1045
                        }
 
1046
 
 
1047
                        if (strcmp(fnamecopy, s_name)
 
1048
                            && strcmp(fnamecopy, l_name)) {
 
1049
                                debug("RootMismatch: |%s|%s|\n", s_name,
 
1050
                                       l_name);
 
1051
                                dentptr++;
 
1052
                                continue;
 
1053
                        }
 
1054
 
 
1055
                        if (isdir && !(dentptr->attr & ATTR_DIR))
 
1056
                                goto exit;
 
1057
 
 
1058
                        debug("RootName: %s", s_name);
 
1059
                        debug(", start: 0x%x", START(dentptr));
 
1060
                        debug(", size:  0x%x %s\n",
 
1061
                               FAT2CPU32(dentptr->size),
 
1062
                               isdir ? "(DIR)" : "");
 
1063
 
 
1064
                        goto rootdir_done;      /* We got a match */
 
1065
                }
 
1066
                debug("END LOOP: j=%d   clust_size=%d\n", j,
 
1067
                       mydata->clust_size);
 
1068
 
 
1069
                /*
 
1070
                 * On FAT32 we must fetch the FAT entries for the next
 
1071
                 * root directory clusters when a cluster has been
 
1072
                 * completely processed.
 
1073
                 */
 
1074
                ++j;
 
1075
                int rootdir_end = 0;
 
1076
                if (mydata->fatsize == 32) {
 
1077
                        if (j == mydata->clust_size) {
 
1078
                                int nxtsect = 0;
 
1079
                                int nxt_clust = 0;
 
1080
 
 
1081
                                nxt_clust = get_fatent(mydata, root_cluster);
 
1082
                                rootdir_end = CHECK_CLUST(nxt_clust, 32);
 
1083
 
 
1084
                                nxtsect = mydata->data_begin +
 
1085
                                        (nxt_clust * mydata->clust_size);
 
1086
 
 
1087
                                root_cluster = nxt_clust;
 
1088
 
 
1089
                                cursect = nxtsect;
 
1090
                                j = 0;
 
1091
                        }
 
1092
                } else {
 
1093
                        if (j == PREFETCH_BLOCKS)
 
1094
                                j = 0;
 
1095
 
 
1096
                        rootdir_end = (++cursect - mydata->rootdir_sect >=
 
1097
                                       rootdir_size);
 
1098
                }
 
1099
 
 
1100
                /* If end of rootdir reached */
 
1101
                if (rootdir_end) {
 
1102
                        if (dols == LS_ROOT) {
 
1103
                                printf("\n%d file(s), %d dir(s)\n\n",
 
1104
                                       files, dirs);
 
1105
                                ret = 0;
 
1106
                        }
 
1107
                        goto exit;
 
1108
                }
 
1109
        }
 
1110
rootdir_done:
 
1111
 
 
1112
        firsttime = 1;
 
1113
 
 
1114
        while (isdir) {
 
1115
                int startsect = mydata->data_begin
 
1116
                        + START(dentptr) * mydata->clust_size;
 
1117
                dir_entry dent;
 
1118
                char *nextname = NULL;
 
1119
 
 
1120
                dent = *dentptr;
 
1121
                dentptr = &dent;
 
1122
 
 
1123
                idx = dirdelim(subname);
 
1124
 
 
1125
                if (idx >= 0) {
 
1126
                        subname[idx] = '\0';
 
1127
                        nextname = subname + idx + 1;
 
1128
                        /* Handle multiple delimiters */
 
1129
                        while (ISDIRDELIM(*nextname))
 
1130
                                nextname++;
 
1131
                        if (dols && *nextname == '\0')
 
1132
                                firsttime = 0;
 
1133
                } else {
 
1134
                        if (dols && firsttime) {
 
1135
                                firsttime = 0;
 
1136
                        } else {
 
1137
                                isdir = 0;
 
1138
                        }
 
1139
                }
 
1140
 
 
1141
                if (get_dentfromdir(mydata, startsect, subname, dentptr,
 
1142
                                     isdir ? 0 : dols) == NULL) {
 
1143
                        if (dols && !isdir)
 
1144
                                ret = 0;
 
1145
                        goto exit;
 
1146
                }
 
1147
 
 
1148
                if (isdir && !(dentptr->attr & ATTR_DIR))
 
1149
                        goto exit;
 
1150
 
 
1151
                if (idx >= 0)
 
1152
                        subname = nextname;
 
1153
        }
 
1154
 
 
1155
        if (dogetsize)
 
1156
                ret = FAT2CPU32(dentptr->size);
 
1157
        else
 
1158
                ret = get_contents(mydata, dentptr, pos, buffer, maxsize);
 
1159
        debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret);
 
1160
 
 
1161
exit:
 
1162
        free(mydata->fatbuf);
 
1163
        return ret;
 
1164
}
 
1165
 
 
1166
long
 
1167
do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
 
1168
{
 
1169
        return do_fat_read_at(filename, 0, buffer, maxsize, dols, 0);
 
1170
}
 
1171
 
 
1172
int file_fat_detectfs(void)
 
1173
{
 
1174
        boot_sector bs;
 
1175
        volume_info volinfo;
 
1176
        int fatsize;
 
1177
        char vol_label[12];
 
1178
 
 
1179
        if (cur_dev == NULL) {
 
1180
                printf("No current device\n");
 
1181
                return 1;
 
1182
        }
 
1183
 
 
1184
#if defined(CONFIG_CMD_IDE) || \
 
1185
    defined(CONFIG_CMD_SATA) || \
 
1186
    defined(CONFIG_CMD_SCSI) || \
 
1187
    defined(CONFIG_CMD_USB) || \
 
1188
    defined(CONFIG_MMC)
 
1189
        printf("Interface:  ");
 
1190
        switch (cur_dev->if_type) {
 
1191
        case IF_TYPE_IDE:
 
1192
                printf("IDE");
 
1193
                break;
 
1194
        case IF_TYPE_SATA:
 
1195
                printf("SATA");
 
1196
                break;
 
1197
        case IF_TYPE_SCSI:
 
1198
                printf("SCSI");
 
1199
                break;
 
1200
        case IF_TYPE_ATAPI:
 
1201
                printf("ATAPI");
 
1202
                break;
 
1203
        case IF_TYPE_USB:
 
1204
                printf("USB");
 
1205
                break;
 
1206
        case IF_TYPE_DOC:
 
1207
                printf("DOC");
 
1208
                break;
 
1209
        case IF_TYPE_MMC:
 
1210
                printf("MMC");
 
1211
                break;
 
1212
        default:
 
1213
                printf("Unknown");
 
1214
        }
 
1215
 
 
1216
        printf("\n  Device %d: ", cur_dev->dev);
 
1217
        dev_print(cur_dev);
 
1218
#endif
 
1219
 
 
1220
        if (read_bootsectandvi(&bs, &volinfo, &fatsize)) {
 
1221
                printf("\nNo valid FAT fs found\n");
 
1222
                return 1;
 
1223
        }
 
1224
 
 
1225
        memcpy(vol_label, volinfo.volume_label, 11);
 
1226
        vol_label[11] = '\0';
 
1227
        volinfo.fs_type[5] = '\0';
 
1228
 
 
1229
        printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label);
 
1230
 
 
1231
        return 0;
 
1232
}
 
1233
 
 
1234
int file_fat_ls(const char *dir)
 
1235
{
 
1236
        return do_fat_read(dir, NULL, 0, LS_YES);
 
1237
}
 
1238
 
 
1239
int fat_exists(const char *filename)
 
1240
{
 
1241
        int sz;
 
1242
        sz = do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1);
 
1243
        return sz >= 0;
 
1244
}
 
1245
 
 
1246
long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
 
1247
                      unsigned long maxsize)
 
1248
{
 
1249
        printf("reading %s\n", filename);
 
1250
        return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO, 0);
 
1251
}
 
1252
 
 
1253
long file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
 
1254
{
 
1255
        return file_fat_read_at(filename, 0, buffer, maxsize);
 
1256
}
 
1257
 
 
1258
int fat_read_file(const char *filename, void *buf, int offset, int len)
 
1259
{
 
1260
        int len_read;
 
1261
 
 
1262
        len_read = file_fat_read_at(filename, offset, buf, len);
 
1263
        if (len_read == -1) {
 
1264
                printf("** Unable to read file %s **\n", filename);
 
1265
                return -1;
 
1266
        }
 
1267
 
 
1268
        return len_read;
 
1269
}
 
1270
 
 
1271
void fat_close(void)
 
1272
{
 
1273
}