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Commit | Line | Data |
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71f95118 WD |
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 | * | |
1a459660 | 9 | * SPDX-License-Identifier: GPL-2.0+ |
71f95118 WD |
10 | */ |
11 | ||
12 | #include <common.h> | |
2a981dc2 | 13 | #include <blk.h> |
71f95118 | 14 | #include <config.h> |
ac497771 | 15 | #include <exports.h> |
71f95118 | 16 | #include <fat.h> |
1f40366b | 17 | #include <fs.h> |
71f95118 | 18 | #include <asm/byteorder.h> |
7205e407 | 19 | #include <part.h> |
9a800ac7 | 20 | #include <malloc.h> |
cf92e05c | 21 | #include <memalign.h> |
9a800ac7 | 22 | #include <linux/compiler.h> |
fb7e16cc | 23 | #include <linux/ctype.h> |
71f95118 | 24 | |
cb940c7e RG |
25 | #ifdef CONFIG_SUPPORT_VFAT |
26 | static const int vfat_enabled = 1; | |
27 | #else | |
28 | static const int vfat_enabled = 0; | |
29 | #endif | |
30 | ||
71f95118 | 31 | /* |
21a24c3b RC |
32 | * Convert a string to lowercase. Converts at most 'len' characters, |
33 | * 'len' may be larger than the length of 'str' if 'str' is NULL | |
34 | * terminated. | |
71f95118 | 35 | */ |
21a24c3b | 36 | static void downcase(char *str, size_t len) |
71f95118 | 37 | { |
21a24c3b | 38 | while (*str != '\0' && len--) { |
fb7e16cc | 39 | *str = tolower(*str); |
71f95118 WD |
40 | str++; |
41 | } | |
42 | } | |
43 | ||
4101f687 | 44 | static struct blk_desc *cur_dev; |
9813b750 | 45 | static disk_partition_t cur_part_info; |
7385c28e | 46 | |
9813b750 | 47 | #define DOS_BOOT_MAGIC_OFFSET 0x1fe |
7205e407 | 48 | #define DOS_FS_TYPE_OFFSET 0x36 |
66c2d73c | 49 | #define DOS_FS32_TYPE_OFFSET 0x52 |
71f95118 | 50 | |
9813b750 | 51 | static int disk_read(__u32 block, __u32 nr_blocks, void *buf) |
71f95118 | 52 | { |
0a04ed86 ŁM |
53 | ulong ret; |
54 | ||
2a981dc2 | 55 | if (!cur_dev) |
7205e407 | 56 | return -1; |
7385c28e | 57 | |
2a981dc2 | 58 | ret = blk_dread(cur_dev, cur_part_info.start + block, nr_blocks, buf); |
0a04ed86 | 59 | |
42a9f147 | 60 | if (ret != nr_blocks) |
0a04ed86 ŁM |
61 | return -1; |
62 | ||
63 | return ret; | |
71f95118 WD |
64 | } |
65 | ||
4101f687 | 66 | int fat_set_blk_dev(struct blk_desc *dev_desc, disk_partition_t *info) |
71f95118 | 67 | { |
9a800ac7 | 68 | ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); |
7205e407 | 69 | |
5e8f9831 SW |
70 | cur_dev = dev_desc; |
71 | cur_part_info = *info; | |
9813b750 KM |
72 | |
73 | /* Make sure it has a valid FAT header */ | |
74 | if (disk_read(0, 1, buffer) != 1) { | |
75 | cur_dev = NULL; | |
76 | return -1; | |
bf1060ea | 77 | } |
9813b750 KM |
78 | |
79 | /* Check if it's actually a DOS volume */ | |
80 | if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) { | |
81 | cur_dev = NULL; | |
82 | return -1; | |
83 | } | |
84 | ||
85 | /* Check for FAT12/FAT16/FAT32 filesystem */ | |
86 | if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3)) | |
87 | return 0; | |
88 | if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5)) | |
89 | return 0; | |
90 | ||
91 | cur_dev = NULL; | |
92 | return -1; | |
71f95118 WD |
93 | } |
94 | ||
4101f687 | 95 | int fat_register_device(struct blk_desc *dev_desc, int part_no) |
5e8f9831 SW |
96 | { |
97 | disk_partition_t info; | |
98 | ||
99 | /* First close any currently found FAT filesystem */ | |
100 | cur_dev = NULL; | |
101 | ||
102 | /* Read the partition table, if present */ | |
3e8bd469 | 103 | if (part_get_info(dev_desc, part_no, &info)) { |
5e8f9831 SW |
104 | if (part_no != 0) { |
105 | printf("** Partition %d not valid on device %d **\n", | |
bcce53d0 | 106 | part_no, dev_desc->devnum); |
5e8f9831 SW |
107 | return -1; |
108 | } | |
109 | ||
110 | info.start = 0; | |
111 | info.size = dev_desc->lba; | |
112 | info.blksz = dev_desc->blksz; | |
113 | info.name[0] = 0; | |
114 | info.type[0] = 0; | |
115 | info.bootable = 0; | |
b331cd62 | 116 | #if CONFIG_IS_ENABLED(PARTITION_UUIDS) |
5e8f9831 SW |
117 | info.uuid[0] = 0; |
118 | #endif | |
119 | } | |
120 | ||
121 | return fat_set_blk_dev(dev_desc, &info); | |
122 | } | |
9813b750 | 123 | |
71f95118 WD |
124 | /* |
125 | * Extract zero terminated short name from a directory entry. | |
126 | */ | |
9795e07b | 127 | static void get_name(dir_entry *dirent, char *s_name) |
71f95118 WD |
128 | { |
129 | char *ptr; | |
130 | ||
7385c28e | 131 | memcpy(s_name, dirent->name, 8); |
71f95118 WD |
132 | s_name[8] = '\0'; |
133 | ptr = s_name; | |
134 | while (*ptr && *ptr != ' ') | |
135 | ptr++; | |
21a24c3b RC |
136 | if (dirent->lcase & CASE_LOWER_BASE) |
137 | downcase(s_name, (unsigned)(ptr - s_name)); | |
71f95118 | 138 | if (dirent->ext[0] && dirent->ext[0] != ' ') { |
21a24c3b | 139 | *ptr++ = '.'; |
7385c28e | 140 | memcpy(ptr, dirent->ext, 3); |
21a24c3b RC |
141 | if (dirent->lcase & CASE_LOWER_EXT) |
142 | downcase(ptr, 3); | |
71f95118 WD |
143 | ptr[3] = '\0'; |
144 | while (*ptr && *ptr != ' ') | |
145 | ptr++; | |
146 | } | |
147 | *ptr = '\0'; | |
148 | if (*s_name == DELETED_FLAG) | |
149 | *s_name = '\0'; | |
150 | else if (*s_name == aRING) | |
3c2c2f42 | 151 | *s_name = DELETED_FLAG; |
71f95118 WD |
152 | } |
153 | ||
b8948d2a SB |
154 | static int flush_dirty_fat_buffer(fsdata *mydata); |
155 | #if !defined(CONFIG_FAT_WRITE) | |
156 | /* Stub for read only operation */ | |
157 | int flush_dirty_fat_buffer(fsdata *mydata) | |
158 | { | |
159 | (void)(mydata); | |
160 | return 0; | |
161 | } | |
162 | #endif | |
163 | ||
71f95118 WD |
164 | /* |
165 | * Get the entry at index 'entry' in a FAT (12/16/32) table. | |
166 | * On failure 0x00 is returned. | |
167 | */ | |
9795e07b | 168 | static __u32 get_fatent(fsdata *mydata, __u32 entry) |
71f95118 WD |
169 | { |
170 | __u32 bufnum; | |
b352caea | 171 | __u32 offset, off8; |
71f95118 WD |
172 | __u32 ret = 0x00; |
173 | ||
b8948d2a SB |
174 | if (CHECK_CLUST(entry, mydata->fatsize)) { |
175 | printf("Error: Invalid FAT entry: 0x%08x\n", entry); | |
176 | return ret; | |
177 | } | |
178 | ||
71f95118 WD |
179 | switch (mydata->fatsize) { |
180 | case 32: | |
181 | bufnum = entry / FAT32BUFSIZE; | |
182 | offset = entry - bufnum * FAT32BUFSIZE; | |
183 | break; | |
184 | case 16: | |
185 | bufnum = entry / FAT16BUFSIZE; | |
186 | offset = entry - bufnum * FAT16BUFSIZE; | |
187 | break; | |
188 | case 12: | |
189 | bufnum = entry / FAT12BUFSIZE; | |
190 | offset = entry - bufnum * FAT12BUFSIZE; | |
191 | break; | |
192 | ||
193 | default: | |
194 | /* Unsupported FAT size */ | |
195 | return ret; | |
196 | } | |
197 | ||
b8948d2a | 198 | debug("FAT%d: entry: 0x%08x = %d, offset: 0x%04x = %d\n", |
7385c28e | 199 | mydata->fatsize, entry, entry, offset, offset); |
2aa98c66 | 200 | |
71f95118 WD |
201 | /* Read a new block of FAT entries into the cache. */ |
202 | if (bufnum != mydata->fatbufnum) { | |
60b36f0f | 203 | __u32 getsize = FATBUFBLOCKS; |
71f95118 WD |
204 | __u8 *bufptr = mydata->fatbuf; |
205 | __u32 fatlength = mydata->fatlength; | |
206 | __u32 startblock = bufnum * FATBUFBLOCKS; | |
207 | ||
6c1a8080 | 208 | /* Cap length if fatlength is not a multiple of FATBUFBLOCKS */ |
8006dd2e BT |
209 | if (startblock + getsize > fatlength) |
210 | getsize = fatlength - startblock; | |
60b36f0f | 211 | |
71f95118 WD |
212 | startblock += mydata->fat_sect; /* Offset from start of disk */ |
213 | ||
b8948d2a SB |
214 | /* Write back the fatbuf to the disk */ |
215 | if (flush_dirty_fat_buffer(mydata) < 0) | |
216 | return -1; | |
217 | ||
71f95118 | 218 | if (disk_read(startblock, getsize, bufptr) < 0) { |
7385c28e | 219 | debug("Error reading FAT blocks\n"); |
71f95118 WD |
220 | return ret; |
221 | } | |
222 | mydata->fatbufnum = bufnum; | |
223 | } | |
224 | ||
225 | /* Get the actual entry from the table */ | |
226 | switch (mydata->fatsize) { | |
227 | case 32: | |
7385c28e | 228 | ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]); |
71f95118 WD |
229 | break; |
230 | case 16: | |
7385c28e | 231 | ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]); |
71f95118 | 232 | break; |
7385c28e | 233 | case 12: |
b352caea SB |
234 | off8 = (offset * 3) / 2; |
235 | /* fatbut + off8 may be unaligned, read in byte granularity */ | |
236 | ret = mydata->fatbuf[off8] + (mydata->fatbuf[off8 + 1] << 8); | |
8d48c92b SB |
237 | |
238 | if (offset & 0x1) | |
239 | ret >>= 4; | |
240 | ret &= 0xfff; | |
71f95118 | 241 | } |
b8948d2a SB |
242 | debug("FAT%d: ret: 0x%08x, entry: 0x%08x, offset: 0x%04x\n", |
243 | mydata->fatsize, ret, entry, offset); | |
71f95118 WD |
244 | |
245 | return ret; | |
246 | } | |
247 | ||
71f95118 WD |
248 | /* |
249 | * Read at most 'size' bytes from the specified cluster into 'buffer'. | |
250 | * Return 0 on success, -1 otherwise. | |
251 | */ | |
252 | static int | |
9795e07b | 253 | get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) |
71f95118 | 254 | { |
3f270f42 | 255 | __u32 idx = 0; |
71f95118 | 256 | __u32 startsect; |
46236b14 | 257 | int ret; |
71f95118 WD |
258 | |
259 | if (clustnum > 0) { | |
265edc03 | 260 | startsect = clust_to_sect(mydata, clustnum); |
71f95118 WD |
261 | } else { |
262 | startsect = mydata->rootdir_sect; | |
263 | } | |
264 | ||
7385c28e WD |
265 | debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); |
266 | ||
cc63b25e | 267 | if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) { |
9a800ac7 | 268 | ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); |
7385c28e | 269 | |
cc63b25e BT |
270 | printf("FAT: Misaligned buffer address (%p)\n", buffer); |
271 | ||
272 | while (size >= mydata->sect_size) { | |
273 | ret = disk_read(startsect++, 1, tmpbuf); | |
274 | if (ret != 1) { | |
275 | debug("Error reading data (got %d)\n", ret); | |
276 | return -1; | |
277 | } | |
278 | ||
279 | memcpy(buffer, tmpbuf, mydata->sect_size); | |
280 | buffer += mydata->sect_size; | |
281 | size -= mydata->sect_size; | |
282 | } | |
283 | } else { | |
ac497771 | 284 | idx = size / mydata->sect_size; |
cc63b25e BT |
285 | ret = disk_read(startsect, idx, buffer); |
286 | if (ret != idx) { | |
287 | debug("Error reading data (got %d)\n", ret); | |
288 | return -1; | |
289 | } | |
290 | startsect += idx; | |
291 | idx *= mydata->sect_size; | |
292 | buffer += idx; | |
293 | size -= idx; | |
294 | } | |
295 | if (size) { | |
296 | ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); | |
297 | ||
298 | ret = disk_read(startsect, 1, tmpbuf); | |
46236b14 KM |
299 | if (ret != 1) { |
300 | debug("Error reading data (got %d)\n", ret); | |
7205e407 | 301 | return -1; |
71f95118 | 302 | } |
7205e407 | 303 | |
cc63b25e | 304 | memcpy(buffer, tmpbuf, size); |
71f95118 WD |
305 | } |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
71f95118 | 310 | /* |
1170e634 | 311 | * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr' |
71f95118 | 312 | * into 'buffer'. |
1ad0b98a | 313 | * Update the number of bytes read in *gotsize or return -1 on fatal errors. |
71f95118 | 314 | */ |
1170e634 BT |
315 | __u8 get_contents_vfatname_block[MAX_CLUSTSIZE] |
316 | __aligned(ARCH_DMA_MINALIGN); | |
317 | ||
1ad0b98a SR |
318 | static int get_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos, |
319 | __u8 *buffer, loff_t maxsize, loff_t *gotsize) | |
71f95118 | 320 | { |
1ad0b98a | 321 | loff_t filesize = FAT2CPU32(dentptr->size); |
ac497771 | 322 | unsigned int bytesperclust = mydata->clust_size * mydata->sect_size; |
71f95118 | 323 | __u32 curclust = START(dentptr); |
7205e407 | 324 | __u32 endclust, newclust; |
1ad0b98a | 325 | loff_t actsize; |
71f95118 | 326 | |
1ad0b98a SR |
327 | *gotsize = 0; |
328 | debug("Filesize: %llu bytes\n", filesize); | |
71f95118 | 329 | |
1170e634 | 330 | if (pos >= filesize) { |
1ad0b98a SR |
331 | debug("Read position past EOF: %llu\n", pos); |
332 | return 0; | |
1170e634 BT |
333 | } |
334 | ||
335 | if (maxsize > 0 && filesize > pos + maxsize) | |
336 | filesize = pos + maxsize; | |
71f95118 | 337 | |
1ad0b98a | 338 | debug("%llu bytes\n", filesize); |
7385c28e | 339 | |
1170e634 BT |
340 | actsize = bytesperclust; |
341 | ||
342 | /* go to cluster at pos */ | |
343 | while (actsize <= pos) { | |
344 | curclust = get_fatent(mydata, curclust); | |
345 | if (CHECK_CLUST(curclust, mydata->fatsize)) { | |
346 | debug("curclust: 0x%x\n", curclust); | |
347 | debug("Invalid FAT entry\n"); | |
1ad0b98a | 348 | return 0; |
1170e634 BT |
349 | } |
350 | actsize += bytesperclust; | |
351 | } | |
352 | ||
353 | /* actsize > pos */ | |
354 | actsize -= bytesperclust; | |
355 | filesize -= actsize; | |
356 | pos -= actsize; | |
357 | ||
358 | /* align to beginning of next cluster if any */ | |
359 | if (pos) { | |
1ad0b98a | 360 | actsize = min(filesize, (loff_t)bytesperclust); |
1170e634 BT |
361 | if (get_cluster(mydata, curclust, get_contents_vfatname_block, |
362 | (int)actsize) != 0) { | |
363 | printf("Error reading cluster\n"); | |
364 | return -1; | |
365 | } | |
366 | filesize -= actsize; | |
367 | actsize -= pos; | |
368 | memcpy(buffer, get_contents_vfatname_block + pos, actsize); | |
1ad0b98a | 369 | *gotsize += actsize; |
1170e634 | 370 | if (!filesize) |
1ad0b98a | 371 | return 0; |
1170e634 BT |
372 | buffer += actsize; |
373 | ||
374 | curclust = get_fatent(mydata, curclust); | |
375 | if (CHECK_CLUST(curclust, mydata->fatsize)) { | |
376 | debug("curclust: 0x%x\n", curclust); | |
377 | debug("Invalid FAT entry\n"); | |
1ad0b98a | 378 | return 0; |
1170e634 BT |
379 | } |
380 | } | |
381 | ||
7385c28e WD |
382 | actsize = bytesperclust; |
383 | endclust = curclust; | |
71f95118 WD |
384 | |
385 | do { | |
7205e407 | 386 | /* search for consecutive clusters */ |
7385c28e | 387 | while (actsize < filesize) { |
7205e407 | 388 | newclust = get_fatent(mydata, endclust); |
7385c28e | 389 | if ((newclust - 1) != endclust) |
7205e407 | 390 | goto getit; |
8ce4e5c2 | 391 | if (CHECK_CLUST(newclust, mydata->fatsize)) { |
7385c28e WD |
392 | debug("curclust: 0x%x\n", newclust); |
393 | debug("Invalid FAT entry\n"); | |
1ad0b98a | 394 | return 0; |
7205e407 | 395 | } |
7385c28e WD |
396 | endclust = newclust; |
397 | actsize += bytesperclust; | |
7205e407 | 398 | } |
7385c28e | 399 | |
7205e407 | 400 | /* get remaining bytes */ |
7385c28e | 401 | actsize = filesize; |
0880e5bb | 402 | if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { |
7385c28e | 403 | printf("Error reading cluster\n"); |
7205e407 WD |
404 | return -1; |
405 | } | |
1ad0b98a SR |
406 | *gotsize += actsize; |
407 | return 0; | |
7205e407 WD |
408 | getit: |
409 | if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { | |
7385c28e | 410 | printf("Error reading cluster\n"); |
7205e407 WD |
411 | return -1; |
412 | } | |
1ad0b98a | 413 | *gotsize += (int)actsize; |
7205e407 WD |
414 | filesize -= actsize; |
415 | buffer += actsize; | |
7385c28e | 416 | |
7205e407 | 417 | curclust = get_fatent(mydata, endclust); |
8ce4e5c2 | 418 | if (CHECK_CLUST(curclust, mydata->fatsize)) { |
7385c28e WD |
419 | debug("curclust: 0x%x\n", curclust); |
420 | printf("Invalid FAT entry\n"); | |
1ad0b98a | 421 | return 0; |
71f95118 | 422 | } |
7385c28e WD |
423 | actsize = bytesperclust; |
424 | endclust = curclust; | |
71f95118 WD |
425 | } while (1); |
426 | } | |
427 | ||
71f95118 WD |
428 | /* |
429 | * Extract the file name information from 'slotptr' into 'l_name', | |
430 | * starting at l_name[*idx]. | |
431 | * Return 1 if terminator (zero byte) is found, 0 otherwise. | |
432 | */ | |
9795e07b | 433 | static int slot2str(dir_slot *slotptr, char *l_name, int *idx) |
71f95118 WD |
434 | { |
435 | int j; | |
436 | ||
437 | for (j = 0; j <= 8; j += 2) { | |
438 | l_name[*idx] = slotptr->name0_4[j]; | |
7385c28e WD |
439 | if (l_name[*idx] == 0x00) |
440 | return 1; | |
71f95118 WD |
441 | (*idx)++; |
442 | } | |
443 | for (j = 0; j <= 10; j += 2) { | |
444 | l_name[*idx] = slotptr->name5_10[j]; | |
7385c28e WD |
445 | if (l_name[*idx] == 0x00) |
446 | return 1; | |
71f95118 WD |
447 | (*idx)++; |
448 | } | |
449 | for (j = 0; j <= 2; j += 2) { | |
450 | l_name[*idx] = slotptr->name11_12[j]; | |
7385c28e WD |
451 | if (l_name[*idx] == 0x00) |
452 | return 1; | |
71f95118 WD |
453 | (*idx)++; |
454 | } | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
71f95118 | 459 | /* Calculate short name checksum */ |
ff04f6d1 | 460 | static __u8 mkcksum(const char name[8], const char ext[3]) |
71f95118 WD |
461 | { |
462 | int i; | |
7385c28e | 463 | |
71f95118 WD |
464 | __u8 ret = 0; |
465 | ||
6ad77d88 | 466 | for (i = 0; i < 8; i++) |
ff04f6d1 | 467 | ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i]; |
6ad77d88 | 468 | for (i = 0; i < 3; i++) |
ff04f6d1 | 469 | ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i]; |
71f95118 WD |
470 | |
471 | return ret; | |
472 | } | |
71f95118 WD |
473 | |
474 | /* | |
8eafae20 RC |
475 | * TODO these should go away once fat_write is reworked to use the |
476 | * directory iterator | |
71f95118 | 477 | */ |
9a800ac7 EN |
478 | __u8 get_dentfromdir_block[MAX_CLUSTSIZE] |
479 | __aligned(ARCH_DMA_MINALIGN); | |
8eafae20 RC |
480 | __u8 do_fat_read_at_block[MAX_CLUSTSIZE] |
481 | __aligned(ARCH_DMA_MINALIGN); | |
71f95118 | 482 | |
71f95118 WD |
483 | /* |
484 | * Read boot sector and volume info from a FAT filesystem | |
485 | */ | |
486 | static int | |
9795e07b | 487 | read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) |
71f95118 | 488 | { |
ac497771 | 489 | __u8 *block; |
71f95118 | 490 | volume_info *vistart; |
ac497771 SS |
491 | int ret = 0; |
492 | ||
493 | if (cur_dev == NULL) { | |
494 | debug("Error: no device selected\n"); | |
495 | return -1; | |
496 | } | |
497 | ||
9a800ac7 | 498 | block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz); |
ac497771 SS |
499 | if (block == NULL) { |
500 | debug("Error: allocating block\n"); | |
501 | return -1; | |
502 | } | |
71f95118 | 503 | |
9795e07b | 504 | if (disk_read(0, 1, block) < 0) { |
7385c28e | 505 | debug("Error: reading block\n"); |
ac497771 | 506 | goto fail; |
71f95118 WD |
507 | } |
508 | ||
509 | memcpy(bs, block, sizeof(boot_sector)); | |
7385c28e WD |
510 | bs->reserved = FAT2CPU16(bs->reserved); |
511 | bs->fat_length = FAT2CPU16(bs->fat_length); | |
512 | bs->secs_track = FAT2CPU16(bs->secs_track); | |
513 | bs->heads = FAT2CPU16(bs->heads); | |
514 | bs->total_sect = FAT2CPU32(bs->total_sect); | |
71f95118 WD |
515 | |
516 | /* FAT32 entries */ | |
517 | if (bs->fat_length == 0) { | |
518 | /* Assume FAT32 */ | |
519 | bs->fat32_length = FAT2CPU32(bs->fat32_length); | |
7385c28e | 520 | bs->flags = FAT2CPU16(bs->flags); |
71f95118 | 521 | bs->root_cluster = FAT2CPU32(bs->root_cluster); |
7385c28e WD |
522 | bs->info_sector = FAT2CPU16(bs->info_sector); |
523 | bs->backup_boot = FAT2CPU16(bs->backup_boot); | |
524 | vistart = (volume_info *)(block + sizeof(boot_sector)); | |
71f95118 WD |
525 | *fatsize = 32; |
526 | } else { | |
7385c28e | 527 | vistart = (volume_info *)&(bs->fat32_length); |
71f95118 WD |
528 | *fatsize = 0; |
529 | } | |
530 | memcpy(volinfo, vistart, sizeof(volume_info)); | |
531 | ||
71f95118 | 532 | if (*fatsize == 32) { |
7385c28e | 533 | if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) |
ac497771 | 534 | goto exit; |
71f95118 | 535 | } else { |
651351fe | 536 | if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { |
71f95118 | 537 | *fatsize = 12; |
ac497771 | 538 | goto exit; |
71f95118 | 539 | } |
651351fe | 540 | if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { |
71f95118 | 541 | *fatsize = 16; |
ac497771 | 542 | goto exit; |
71f95118 WD |
543 | } |
544 | } | |
545 | ||
7385c28e | 546 | debug("Error: broken fs_type sign\n"); |
ac497771 SS |
547 | fail: |
548 | ret = -1; | |
549 | exit: | |
550 | free(block); | |
551 | return ret; | |
71f95118 WD |
552 | } |
553 | ||
45449980 | 554 | static int get_fs_info(fsdata *mydata) |
71f95118 | 555 | { |
7385c28e WD |
556 | boot_sector bs; |
557 | volume_info volinfo; | |
45449980 | 558 | int ret; |
7385c28e | 559 | |
45449980 RC |
560 | ret = read_bootsectandvi(&bs, &volinfo, &mydata->fatsize); |
561 | if (ret) { | |
7385c28e | 562 | debug("Error: reading boot sector\n"); |
45449980 | 563 | return ret; |
7385c28e WD |
564 | } |
565 | ||
40e21916 | 566 | if (mydata->fatsize == 32) { |
7385c28e | 567 | mydata->fatlength = bs.fat32_length; |
40e21916 | 568 | } else { |
7385c28e | 569 | mydata->fatlength = bs.fat_length; |
40e21916 | 570 | } |
7385c28e WD |
571 | |
572 | mydata->fat_sect = bs.reserved; | |
573 | ||
45449980 | 574 | mydata->rootdir_sect = mydata->fat_sect + mydata->fatlength * bs.fats; |
7385c28e | 575 | |
ac497771 | 576 | mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0]; |
7385c28e | 577 | mydata->clust_size = bs.cluster_size; |
46236b14 KM |
578 | if (mydata->sect_size != cur_part_info.blksz) { |
579 | printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n", | |
580 | mydata->sect_size, cur_part_info.blksz); | |
581 | return -1; | |
582 | } | |
7385c28e WD |
583 | |
584 | if (mydata->fatsize == 32) { | |
585 | mydata->data_begin = mydata->rootdir_sect - | |
586 | (mydata->clust_size * 2); | |
c6e3baa5 | 587 | mydata->root_cluster = bs.root_cluster; |
7385c28e | 588 | } else { |
45449980 RC |
589 | mydata->rootdir_size = ((bs.dir_entries[1] * (int)256 + |
590 | bs.dir_entries[0]) * | |
591 | sizeof(dir_entry)) / | |
592 | mydata->sect_size; | |
7385c28e | 593 | mydata->data_begin = mydata->rootdir_sect + |
45449980 | 594 | mydata->rootdir_size - |
7385c28e | 595 | (mydata->clust_size * 2); |
265edc03 RC |
596 | mydata->root_cluster = |
597 | sect_to_clust(mydata, mydata->rootdir_sect); | |
7385c28e WD |
598 | } |
599 | ||
600 | mydata->fatbufnum = -1; | |
3c0ed9c3 | 601 | mydata->fat_dirty = 0; |
9a800ac7 | 602 | mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE); |
ac497771 SS |
603 | if (mydata->fatbuf == NULL) { |
604 | debug("Error: allocating memory\n"); | |
605 | return -1; | |
606 | } | |
71f95118 | 607 | |
cb940c7e RG |
608 | if (vfat_enabled) |
609 | debug("VFAT Support enabled\n"); | |
610 | ||
7385c28e WD |
611 | debug("FAT%d, fat_sect: %d, fatlength: %d\n", |
612 | mydata->fatsize, mydata->fat_sect, mydata->fatlength); | |
613 | debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" | |
614 | "Data begins at: %d\n", | |
c6e3baa5 | 615 | mydata->root_cluster, |
7385c28e | 616 | mydata->rootdir_sect, |
ac497771 SS |
617 | mydata->rootdir_sect * mydata->sect_size, mydata->data_begin); |
618 | debug("Sector size: %d, cluster size: %d\n", mydata->sect_size, | |
619 | mydata->clust_size); | |
7385c28e | 620 | |
45449980 RC |
621 | return 0; |
622 | } | |
623 | ||
c6e3baa5 RC |
624 | |
625 | /* | |
626 | * Directory iterator, to simplify filesystem traversal | |
627 | * | |
628 | * Implements an iterator pattern to traverse directory tables, | |
629 | * transparently handling directory tables split across multiple | |
630 | * clusters, and the difference between FAT12/FAT16 root directory | |
631 | * (contiguous) and subdirectories + FAT32 root (chained). | |
632 | * | |
633 | * Rough usage: | |
634 | * | |
635 | * for (fat_itr_root(&itr, fsdata); fat_itr_next(&itr); ) { | |
636 | * // to traverse down to a subdirectory pointed to by | |
637 | * // current iterator position: | |
638 | * fat_itr_child(&itr, &itr); | |
639 | * } | |
640 | * | |
641 | * For more complete example, see fat_itr_resolve() | |
642 | */ | |
643 | ||
644 | typedef struct { | |
645 | fsdata *fsdata; /* filesystem parameters */ | |
646 | unsigned clust; /* current cluster */ | |
647 | int last_cluster; /* set once we've read last cluster */ | |
648 | int is_root; /* is iterator at root directory */ | |
649 | int remaining; /* remaining dent's in current cluster */ | |
650 | ||
651 | /* current iterator position values: */ | |
652 | dir_entry *dent; /* current directory entry */ | |
653 | char l_name[VFAT_MAXLEN_BYTES]; /* long (vfat) name */ | |
654 | char s_name[14]; /* short 8.3 name */ | |
655 | char *name; /* l_name if there is one, else s_name */ | |
656 | ||
657 | /* storage for current cluster in memory: */ | |
658 | u8 block[MAX_CLUSTSIZE] __aligned(ARCH_DMA_MINALIGN); | |
659 | } fat_itr; | |
660 | ||
661 | static int fat_itr_isdir(fat_itr *itr); | |
662 | ||
663 | /** | |
664 | * fat_itr_root() - initialize an iterator to start at the root | |
665 | * directory | |
666 | * | |
667 | * @itr: iterator to initialize | |
668 | * @fsdata: filesystem data for the partition | |
669 | * @return 0 on success, else -errno | |
670 | */ | |
671 | static int fat_itr_root(fat_itr *itr, fsdata *fsdata) | |
672 | { | |
673 | if (get_fs_info(fsdata)) | |
674 | return -ENXIO; | |
675 | ||
676 | itr->fsdata = fsdata; | |
677 | itr->clust = fsdata->root_cluster; | |
678 | itr->dent = NULL; | |
679 | itr->remaining = 0; | |
680 | itr->last_cluster = 0; | |
681 | itr->is_root = 1; | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | /** | |
687 | * fat_itr_child() - initialize an iterator to descend into a sub- | |
688 | * directory | |
689 | * | |
690 | * Initializes 'itr' to iterate the contents of the directory at | |
691 | * the current cursor position of 'parent'. It is an error to | |
692 | * call this if the current cursor of 'parent' is pointing at a | |
693 | * regular file. | |
694 | * | |
695 | * Note that 'itr' and 'parent' can be the same pointer if you do | |
696 | * not need to preserve 'parent' after this call, which is useful | |
697 | * for traversing directory structure to resolve a file/directory. | |
698 | * | |
699 | * @itr: iterator to initialize | |
700 | * @parent: the iterator pointing at a directory entry in the | |
701 | * parent directory of the directory to iterate | |
702 | */ | |
703 | static void fat_itr_child(fat_itr *itr, fat_itr *parent) | |
704 | { | |
705 | fsdata *mydata = parent->fsdata; /* for silly macros */ | |
706 | unsigned clustnum = START(parent->dent); | |
707 | ||
708 | assert(fat_itr_isdir(parent)); | |
709 | ||
710 | itr->fsdata = parent->fsdata; | |
711 | if (clustnum > 0) { | |
712 | itr->clust = clustnum; | |
713 | } else { | |
714 | itr->clust = parent->fsdata->root_cluster; | |
715 | } | |
716 | itr->dent = NULL; | |
717 | itr->remaining = 0; | |
718 | itr->last_cluster = 0; | |
719 | itr->is_root = 0; | |
720 | } | |
721 | ||
722 | static void *next_cluster(fat_itr *itr) | |
723 | { | |
724 | fsdata *mydata = itr->fsdata; /* for silly macros */ | |
725 | int ret; | |
726 | u32 sect; | |
727 | ||
728 | /* have we reached the end? */ | |
729 | if (itr->last_cluster) | |
730 | return NULL; | |
731 | ||
732 | sect = clust_to_sect(itr->fsdata, itr->clust); | |
733 | ||
734 | debug("FAT read(sect=%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n", | |
735 | sect, itr->fsdata->clust_size, DIRENTSPERBLOCK); | |
736 | ||
737 | /* | |
738 | * NOTE: do_fat_read_at() had complicated logic to deal w/ | |
739 | * vfat names that span multiple clusters in the fat16 case, | |
740 | * which get_dentfromdir() probably also needed (and was | |
741 | * missing). And not entirely sure what fat32 didn't have | |
742 | * the same issue.. We solve that by only caring about one | |
743 | * dent at a time and iteratively constructing the vfat long | |
744 | * name. | |
745 | */ | |
746 | ret = disk_read(sect, itr->fsdata->clust_size, | |
747 | itr->block); | |
748 | if (ret < 0) { | |
749 | debug("Error: reading block\n"); | |
750 | return NULL; | |
751 | } | |
752 | ||
753 | if (itr->is_root && itr->fsdata->fatsize != 32) { | |
754 | itr->clust++; | |
755 | sect = clust_to_sect(itr->fsdata, itr->clust); | |
756 | if (sect - itr->fsdata->rootdir_sect >= | |
757 | itr->fsdata->rootdir_size) { | |
758 | debug("cursect: 0x%x\n", itr->clust); | |
759 | itr->last_cluster = 1; | |
760 | } | |
761 | } else { | |
762 | itr->clust = get_fatent(itr->fsdata, itr->clust); | |
763 | if (CHECK_CLUST(itr->clust, itr->fsdata->fatsize)) { | |
764 | debug("cursect: 0x%x\n", itr->clust); | |
765 | itr->last_cluster = 1; | |
766 | } | |
767 | } | |
768 | ||
769 | return itr->block; | |
770 | } | |
771 | ||
772 | static dir_entry *next_dent(fat_itr *itr) | |
773 | { | |
774 | if (itr->remaining == 0) { | |
775 | struct dir_entry *dent = next_cluster(itr); | |
776 | unsigned nbytes = itr->fsdata->sect_size * | |
777 | itr->fsdata->clust_size; | |
778 | ||
779 | /* have we reached the last cluster? */ | |
780 | if (!dent) | |
781 | return NULL; | |
782 | ||
783 | itr->remaining = nbytes / sizeof(dir_entry) - 1; | |
784 | itr->dent = dent; | |
785 | } else { | |
786 | itr->remaining--; | |
787 | itr->dent++; | |
788 | } | |
789 | ||
790 | /* have we reached the last valid entry? */ | |
791 | if (itr->dent->name[0] == 0) | |
792 | return NULL; | |
793 | ||
794 | return itr->dent; | |
795 | } | |
796 | ||
797 | static dir_entry *extract_vfat_name(fat_itr *itr) | |
798 | { | |
799 | struct dir_entry *dent = itr->dent; | |
800 | int seqn = itr->dent->name[0] & ~LAST_LONG_ENTRY_MASK; | |
801 | u8 chksum, alias_checksum = ((dir_slot *)dent)->alias_checksum; | |
802 | int n = 0; | |
803 | ||
804 | while (seqn--) { | |
805 | char buf[13]; | |
806 | int idx = 0; | |
807 | ||
808 | slot2str((dir_slot *)dent, buf, &idx); | |
809 | ||
810 | /* shift accumulated long-name up and copy new part in: */ | |
811 | memmove(itr->l_name + idx, itr->l_name, n); | |
812 | memcpy(itr->l_name, buf, idx); | |
813 | n += idx; | |
814 | ||
815 | dent = next_dent(itr); | |
816 | if (!dent) | |
817 | return NULL; | |
818 | } | |
819 | ||
820 | itr->l_name[n] = '\0'; | |
821 | ||
822 | chksum = mkcksum(dent->name, dent->ext); | |
823 | ||
824 | /* checksum mismatch could mean deleted file, etc.. skip it: */ | |
825 | if (chksum != alias_checksum) { | |
826 | debug("** chksum=%x, alias_checksum=%x, l_name=%s, s_name=%8s.%3s\n", | |
827 | chksum, alias_checksum, itr->l_name, dent->name, dent->ext); | |
828 | return NULL; | |
829 | } | |
830 | ||
831 | return dent; | |
832 | } | |
833 | ||
834 | /** | |
835 | * fat_itr_next() - step to the next entry in a directory | |
836 | * | |
837 | * Must be called once on a new iterator before the cursor is valid. | |
838 | * | |
839 | * @itr: the iterator to iterate | |
840 | * @return boolean, 1 if success or 0 if no more entries in the | |
841 | * current directory | |
842 | */ | |
843 | static int fat_itr_next(fat_itr *itr) | |
844 | { | |
845 | dir_entry *dent; | |
846 | ||
847 | itr->name = NULL; | |
848 | ||
849 | while (1) { | |
850 | dent = next_dent(itr); | |
851 | if (!dent) | |
852 | return 0; | |
853 | ||
854 | if (dent->name[0] == DELETED_FLAG || | |
855 | dent->name[0] == aRING) | |
856 | continue; | |
857 | ||
858 | if (dent->attr & ATTR_VOLUME) { | |
859 | if (vfat_enabled && | |
860 | (dent->attr & ATTR_VFAT) == ATTR_VFAT && | |
861 | (dent->name[0] & LAST_LONG_ENTRY_MASK)) { | |
862 | dent = extract_vfat_name(itr); | |
863 | if (!dent) | |
864 | continue; | |
865 | itr->name = itr->l_name; | |
866 | break; | |
867 | } else { | |
868 | /* Volume label or VFAT entry, skip */ | |
869 | continue; | |
870 | } | |
871 | } | |
872 | ||
873 | break; | |
874 | } | |
875 | ||
876 | get_name(dent, itr->s_name); | |
877 | if (!itr->name) | |
878 | itr->name = itr->s_name; | |
879 | ||
880 | return 1; | |
881 | } | |
882 | ||
883 | /** | |
884 | * fat_itr_isdir() - is current cursor position pointing to a directory | |
885 | * | |
886 | * @itr: the iterator | |
887 | * @return true if cursor is at a directory | |
888 | */ | |
889 | static int fat_itr_isdir(fat_itr *itr) | |
890 | { | |
891 | return !!(itr->dent->attr & ATTR_DIR); | |
892 | } | |
893 | ||
894 | /* | |
895 | * Helpers: | |
896 | */ | |
897 | ||
898 | #define TYPE_FILE 0x1 | |
899 | #define TYPE_DIR 0x2 | |
900 | #define TYPE_ANY (TYPE_FILE | TYPE_DIR) | |
901 | ||
902 | /** | |
903 | * fat_itr_resolve() - traverse directory structure to resolve the | |
904 | * requested path. | |
905 | * | |
906 | * Traverse directory structure to the requested path. If the specified | |
907 | * path is to a directory, this will descend into the directory and | |
908 | * leave it iterator at the start of the directory. If the path is to a | |
909 | * file, it will leave the iterator in the parent directory with current | |
910 | * cursor at file's entry in the directory. | |
911 | * | |
912 | * @itr: iterator initialized to root | |
913 | * @path: the requested path | |
914 | * @type: bitmask of allowable file types | |
915 | * @return 0 on success or -errno | |
916 | */ | |
917 | static int fat_itr_resolve(fat_itr *itr, const char *path, unsigned type) | |
918 | { | |
919 | const char *next; | |
920 | ||
921 | /* chomp any extra leading slashes: */ | |
922 | while (path[0] && ISDIRDELIM(path[0])) | |
923 | path++; | |
924 | ||
925 | /* are we at the end? */ | |
926 | if (strlen(path) == 0) { | |
927 | if (!(type & TYPE_DIR)) | |
928 | return -ENOENT; | |
929 | return 0; | |
930 | } | |
931 | ||
932 | /* find length of next path entry: */ | |
933 | next = path; | |
934 | while (next[0] && !ISDIRDELIM(next[0])) | |
935 | next++; | |
936 | ||
937 | while (fat_itr_next(itr)) { | |
938 | int match = 0; | |
939 | unsigned n = max(strlen(itr->name), (size_t)(next - path)); | |
940 | ||
941 | /* check both long and short name: */ | |
942 | if (!strncasecmp(path, itr->name, n)) | |
943 | match = 1; | |
944 | else if (itr->name != itr->s_name && | |
945 | !strncasecmp(path, itr->s_name, n)) | |
946 | match = 1; | |
947 | ||
948 | if (!match) | |
949 | continue; | |
950 | ||
951 | if (fat_itr_isdir(itr)) { | |
952 | /* recurse into directory: */ | |
953 | fat_itr_child(itr, itr); | |
954 | return fat_itr_resolve(itr, next, type); | |
955 | } else if (next[0]) { | |
956 | /* | |
957 | * If next is not empty then we have a case | |
958 | * like: /path/to/realfile/nonsense | |
959 | */ | |
960 | debug("bad trailing path: %s\n", next); | |
961 | return -ENOENT; | |
962 | } else if (!(type & TYPE_FILE)) { | |
963 | return -ENOTDIR; | |
964 | } else { | |
965 | return 0; | |
966 | } | |
967 | } | |
968 | ||
969 | return -ENOENT; | |
970 | } | |
971 | ||
9795e07b | 972 | int file_fat_detectfs(void) |
71f95118 | 973 | { |
7385c28e WD |
974 | boot_sector bs; |
975 | volume_info volinfo; | |
976 | int fatsize; | |
977 | char vol_label[12]; | |
71f95118 | 978 | |
7385c28e | 979 | if (cur_dev == NULL) { |
7205e407 WD |
980 | printf("No current device\n"); |
981 | return 1; | |
982 | } | |
7385c28e | 983 | |
fc843a02 | 984 | #if defined(CONFIG_IDE) || \ |
10e40d54 | 985 | defined(CONFIG_SATA) || \ |
c649e3c9 | 986 | defined(CONFIG_SCSI) || \ |
dd60d122 | 987 | defined(CONFIG_CMD_USB) || \ |
21f6f963 | 988 | defined(CONFIG_MMC) |
7205e407 | 989 | printf("Interface: "); |
7385c28e WD |
990 | switch (cur_dev->if_type) { |
991 | case IF_TYPE_IDE: | |
992 | printf("IDE"); | |
993 | break; | |
994 | case IF_TYPE_SATA: | |
995 | printf("SATA"); | |
996 | break; | |
997 | case IF_TYPE_SCSI: | |
998 | printf("SCSI"); | |
999 | break; | |
1000 | case IF_TYPE_ATAPI: | |
1001 | printf("ATAPI"); | |
1002 | break; | |
1003 | case IF_TYPE_USB: | |
1004 | printf("USB"); | |
1005 | break; | |
1006 | case IF_TYPE_DOC: | |
1007 | printf("DOC"); | |
1008 | break; | |
1009 | case IF_TYPE_MMC: | |
1010 | printf("MMC"); | |
1011 | break; | |
1012 | default: | |
1013 | printf("Unknown"); | |
7205e407 | 1014 | } |
7385c28e | 1015 | |
bcce53d0 | 1016 | printf("\n Device %d: ", cur_dev->devnum); |
7205e407 WD |
1017 | dev_print(cur_dev); |
1018 | #endif | |
7385c28e WD |
1019 | |
1020 | if (read_bootsectandvi(&bs, &volinfo, &fatsize)) { | |
7205e407 WD |
1021 | printf("\nNo valid FAT fs found\n"); |
1022 | return 1; | |
1023 | } | |
7385c28e WD |
1024 | |
1025 | memcpy(vol_label, volinfo.volume_label, 11); | |
7205e407 | 1026 | vol_label[11] = '\0'; |
7385c28e WD |
1027 | volinfo.fs_type[5] = '\0'; |
1028 | ||
461f86e6 | 1029 | printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label); |
7385c28e | 1030 | |
7205e407 | 1031 | return 0; |
71f95118 WD |
1032 | } |
1033 | ||
b7b5f319 SW |
1034 | int fat_exists(const char *filename) |
1035 | { | |
8eafae20 | 1036 | fsdata fsdata; |
2460098c | 1037 | fat_itr *itr; |
1ad0b98a | 1038 | int ret; |
1ad0b98a | 1039 | |
2460098c | 1040 | itr = malloc(sizeof(fat_itr)); |
8eafae20 RC |
1041 | ret = fat_itr_root(itr, &fsdata); |
1042 | if (ret) | |
1043 | return 0; | |
1044 | ||
1045 | ret = fat_itr_resolve(itr, filename, TYPE_ANY); | |
725ffdb5 | 1046 | free(fsdata.fatbuf); |
2460098c | 1047 | free(itr); |
1ad0b98a | 1048 | return ret == 0; |
b7b5f319 SW |
1049 | } |
1050 | ||
d455d878 | 1051 | int fat_size(const char *filename, loff_t *size) |
cf659819 | 1052 | { |
8eafae20 | 1053 | fsdata fsdata; |
2460098c | 1054 | fat_itr *itr; |
8eafae20 RC |
1055 | int ret; |
1056 | ||
2460098c | 1057 | itr = malloc(sizeof(fat_itr)); |
8eafae20 RC |
1058 | ret = fat_itr_root(itr, &fsdata); |
1059 | if (ret) | |
1060 | return ret; | |
1061 | ||
1062 | ret = fat_itr_resolve(itr, filename, TYPE_FILE); | |
1063 | if (ret) { | |
1064 | /* | |
1065 | * Directories don't have size, but fs_size() is not | |
1066 | * expected to fail if passed a directory path: | |
1067 | */ | |
725ffdb5 | 1068 | free(fsdata.fatbuf); |
8eafae20 RC |
1069 | fat_itr_root(itr, &fsdata); |
1070 | if (!fat_itr_resolve(itr, filename, TYPE_DIR)) { | |
1071 | *size = 0; | |
725ffdb5 | 1072 | ret = 0; |
8eafae20 | 1073 | } |
725ffdb5 | 1074 | goto out; |
8eafae20 RC |
1075 | } |
1076 | ||
1077 | *size = FAT2CPU32(itr->dent->size); | |
725ffdb5 | 1078 | free(fsdata.fatbuf); |
2460098c TR |
1079 | out: |
1080 | free(itr); | |
725ffdb5 | 1081 | return ret; |
cf659819 SW |
1082 | } |
1083 | ||
1ad0b98a SR |
1084 | int file_fat_read_at(const char *filename, loff_t pos, void *buffer, |
1085 | loff_t maxsize, loff_t *actread) | |
71f95118 | 1086 | { |
8eafae20 | 1087 | fsdata fsdata; |
2460098c | 1088 | fat_itr *itr; |
8eafae20 RC |
1089 | int ret; |
1090 | ||
2460098c | 1091 | itr = malloc(sizeof(fat_itr)); |
8eafae20 RC |
1092 | ret = fat_itr_root(itr, &fsdata); |
1093 | if (ret) | |
1094 | return ret; | |
1095 | ||
1096 | ret = fat_itr_resolve(itr, filename, TYPE_FILE); | |
1097 | if (ret) | |
725ffdb5 | 1098 | goto out; |
8eafae20 | 1099 | |
7385c28e | 1100 | printf("reading %s\n", filename); |
725ffdb5 RC |
1101 | ret = get_contents(&fsdata, itr->dent, pos, buffer, maxsize, actread); |
1102 | ||
1103 | out: | |
1104 | free(fsdata.fatbuf); | |
2460098c | 1105 | free(itr); |
725ffdb5 | 1106 | return ret; |
1170e634 BT |
1107 | } |
1108 | ||
1ad0b98a | 1109 | int file_fat_read(const char *filename, void *buffer, int maxsize) |
1170e634 | 1110 | { |
1ad0b98a SR |
1111 | loff_t actread; |
1112 | int ret; | |
1113 | ||
1114 | ret = file_fat_read_at(filename, 0, buffer, maxsize, &actread); | |
1115 | if (ret) | |
1116 | return ret; | |
1117 | else | |
1118 | return actread; | |
71f95118 | 1119 | } |
e6d52415 | 1120 | |
d455d878 SR |
1121 | int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len, |
1122 | loff_t *actread) | |
e6d52415 | 1123 | { |
1ad0b98a | 1124 | int ret; |
e6d52415 | 1125 | |
d455d878 SR |
1126 | ret = file_fat_read_at(filename, offset, buf, len, actread); |
1127 | if (ret) | |
e6d52415 | 1128 | printf("** Unable to read file %s **\n", filename); |
e6d52415 | 1129 | |
d455d878 | 1130 | return ret; |
e6d52415 SG |
1131 | } |
1132 | ||
1f40366b RC |
1133 | typedef struct { |
1134 | struct fs_dir_stream parent; | |
1135 | struct fs_dirent dirent; | |
1136 | fsdata fsdata; | |
1137 | fat_itr itr; | |
1138 | } fat_dir; | |
1139 | ||
1140 | int fat_opendir(const char *filename, struct fs_dir_stream **dirsp) | |
1141 | { | |
725ffdb5 | 1142 | fat_dir *dir = calloc(1, sizeof(*dir)); |
1f40366b RC |
1143 | int ret; |
1144 | ||
1145 | if (!dir) | |
1146 | return -ENOMEM; | |
1147 | ||
1148 | ret = fat_itr_root(&dir->itr, &dir->fsdata); | |
1149 | if (ret) | |
1150 | goto fail; | |
1151 | ||
1152 | ret = fat_itr_resolve(&dir->itr, filename, TYPE_DIR); | |
1153 | if (ret) | |
1154 | goto fail; | |
1155 | ||
1156 | *dirsp = (struct fs_dir_stream *)dir; | |
1157 | return 0; | |
1158 | ||
1159 | fail: | |
725ffdb5 | 1160 | free(dir->fsdata.fatbuf); |
1f40366b RC |
1161 | free(dir); |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp) | |
1166 | { | |
1167 | fat_dir *dir = (fat_dir *)dirs; | |
1168 | struct fs_dirent *dent = &dir->dirent; | |
1169 | ||
1170 | if (!fat_itr_next(&dir->itr)) | |
1171 | return -ENOENT; | |
1172 | ||
1173 | memset(dent, 0, sizeof(*dent)); | |
1174 | strcpy(dent->name, dir->itr.name); | |
1175 | ||
1176 | if (fat_itr_isdir(&dir->itr)) { | |
1177 | dent->type = FS_DT_DIR; | |
1178 | } else { | |
1179 | dent->type = FS_DT_REG; | |
1180 | dent->size = FAT2CPU32(dir->itr.dent->size); | |
1181 | } | |
1182 | ||
1183 | *dentp = dent; | |
1184 | ||
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | void fat_closedir(struct fs_dir_stream *dirs) | |
1189 | { | |
1190 | fat_dir *dir = (fat_dir *)dirs; | |
725ffdb5 | 1191 | free(dir->fsdata.fatbuf); |
1f40366b RC |
1192 | free(dir); |
1193 | } | |
1194 | ||
e6d52415 SG |
1195 | void fat_close(void) |
1196 | { | |
1197 | } |