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wdenk71f95112003-06-15 22:40:42 +00001/*
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 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02009 * SPDX-License-Identifier: GPL-2.0+
wdenk71f95112003-06-15 22:40:42 +000010 */
11
12#include <common.h>
Simon Glass2a981dc2016-02-29 15:25:52 -070013#include <blk.h>
wdenk71f95112003-06-15 22:40:42 +000014#include <config.h>
Sergei Shtylyovac497772011-08-08 09:38:33 +000015#include <exports.h>
wdenk71f95112003-06-15 22:40:42 +000016#include <fat.h>
Rob Clark1f403662017-09-09 13:15:56 -040017#include <fs.h>
wdenk71f95112003-06-15 22:40:42 +000018#include <asm/byteorder.h>
wdenk7205e402003-09-10 22:30:53 +000019#include <part.h>
Eric Nelson9a800ac2012-04-11 04:08:53 +000020#include <malloc.h>
Simon Glasscf92e052015-09-02 17:24:58 -060021#include <memalign.h>
Eric Nelson9a800ac2012-04-11 04:08:53 +000022#include <linux/compiler.h>
Richard Genoudfb7e16c2012-12-13 00:47:36 +000023#include <linux/ctype.h>
wdenk71f95112003-06-15 22:40:42 +000024
Richard Genoudcb940c72012-12-13 03:30:10 +000025#ifdef CONFIG_SUPPORT_VFAT
26static const int vfat_enabled = 1;
27#else
28static const int vfat_enabled = 0;
29#endif
30
wdenk71f95112003-06-15 22:40:42 +000031/*
Rob Clark21a24c32017-09-09 13:15:59 -040032 * 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.
wdenk71f95112003-06-15 22:40:42 +000035 */
Rob Clark21a24c32017-09-09 13:15:59 -040036static void downcase(char *str, size_t len)
wdenk71f95112003-06-15 22:40:42 +000037{
Rob Clark21a24c32017-09-09 13:15:59 -040038 while (*str != '\0' && len--) {
Richard Genoudfb7e16c2012-12-13 00:47:36 +000039 *str = tolower(*str);
wdenk71f95112003-06-15 22:40:42 +000040 str++;
41 }
42}
43
Simon Glass4101f682016-02-29 15:25:34 -070044static struct blk_desc *cur_dev;
Kyle Moffett9813b752011-12-21 07:08:10 +000045static disk_partition_t cur_part_info;
Wolfgang Denk7385c282010-07-19 11:37:00 +020046
Kyle Moffett9813b752011-12-21 07:08:10 +000047#define DOS_BOOT_MAGIC_OFFSET 0x1fe
wdenk7205e402003-09-10 22:30:53 +000048#define DOS_FS_TYPE_OFFSET 0x36
Wolfgang Denk66c2d732010-07-19 11:36:57 +020049#define DOS_FS32_TYPE_OFFSET 0x52
wdenk71f95112003-06-15 22:40:42 +000050
Kyle Moffett9813b752011-12-21 07:08:10 +000051static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
wdenk71f95112003-06-15 22:40:42 +000052{
Łukasz Majewski0a04ed82015-09-03 14:21:39 +020053 ulong ret;
54
Simon Glass2a981dc2016-02-29 15:25:52 -070055 if (!cur_dev)
wdenk7205e402003-09-10 22:30:53 +000056 return -1;
Wolfgang Denk7385c282010-07-19 11:37:00 +020057
Simon Glass2a981dc2016-02-29 15:25:52 -070058 ret = blk_dread(cur_dev, cur_part_info.start + block, nr_blocks, buf);
Łukasz Majewski0a04ed82015-09-03 14:21:39 +020059
Tom Rini42a9f142017-08-14 21:02:08 -040060 if (ret != nr_blocks)
Łukasz Majewski0a04ed82015-09-03 14:21:39 +020061 return -1;
62
63 return ret;
wdenk71f95112003-06-15 22:40:42 +000064}
65
Simon Glass4101f682016-02-29 15:25:34 -070066int fat_set_blk_dev(struct blk_desc *dev_desc, disk_partition_t *info)
wdenk71f95112003-06-15 22:40:42 +000067{
Eric Nelson9a800ac2012-04-11 04:08:53 +000068 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
wdenk7205e402003-09-10 22:30:53 +000069
Stephen Warren5e8f9832012-10-17 06:44:59 +000070 cur_dev = dev_desc;
71 cur_part_info = *info;
Kyle Moffett9813b752011-12-21 07:08:10 +000072
73 /* Make sure it has a valid FAT header */
74 if (disk_read(0, 1, buffer) != 1) {
75 cur_dev = NULL;
76 return -1;
77 }
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;
wdenk71f95112003-06-15 22:40:42 +000093}
94
Simon Glass4101f682016-02-29 15:25:34 -070095int fat_register_device(struct blk_desc *dev_desc, int part_no)
Stephen Warren5e8f9832012-10-17 06:44:59 +000096{
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 */
Simon Glass3e8bd462016-02-29 15:25:48 -0700103 if (part_get_info(dev_desc, part_no, &info)) {
Stephen Warren5e8f9832012-10-17 06:44:59 +0000104 if (part_no != 0) {
105 printf("** Partition %d not valid on device %d **\n",
Simon Glassbcce53d2016-02-29 15:25:51 -0700106 part_no, dev_desc->devnum);
Stephen Warren5e8f9832012-10-17 06:44:59 +0000107 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;
Patrick Delaunayb331cd62017-01-27 11:00:42 +0100116#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
Stephen Warren5e8f9832012-10-17 06:44:59 +0000117 info.uuid[0] = 0;
118#endif
119 }
120
121 return fat_set_blk_dev(dev_desc, &info);
122}
Kyle Moffett9813b752011-12-21 07:08:10 +0000123
wdenk71f95112003-06-15 22:40:42 +0000124/*
wdenk71f95112003-06-15 22:40:42 +0000125 * Extract zero terminated short name from a directory entry.
126 */
Benoît Thébaudeau9795e072012-07-20 15:18:44 +0200127static void get_name(dir_entry *dirent, char *s_name)
wdenk71f95112003-06-15 22:40:42 +0000128{
129 char *ptr;
130
Wolfgang Denk7385c282010-07-19 11:37:00 +0200131 memcpy(s_name, dirent->name, 8);
wdenk71f95112003-06-15 22:40:42 +0000132 s_name[8] = '\0';
133 ptr = s_name;
134 while (*ptr && *ptr != ' ')
135 ptr++;
Rob Clark21a24c32017-09-09 13:15:59 -0400136 if (dirent->lcase & CASE_LOWER_BASE)
137 downcase(s_name, (unsigned)(ptr - s_name));
wdenk71f95112003-06-15 22:40:42 +0000138 if (dirent->ext[0] && dirent->ext[0] != ' ') {
Rob Clark21a24c32017-09-09 13:15:59 -0400139 *ptr++ = '.';
Wolfgang Denk7385c282010-07-19 11:37:00 +0200140 memcpy(ptr, dirent->ext, 3);
Rob Clark21a24c32017-09-09 13:15:59 -0400141 if (dirent->lcase & CASE_LOWER_EXT)
142 downcase(ptr, 3);
wdenk71f95112003-06-15 22:40:42 +0000143 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)
Remy Bohmer3c2c2f42008-11-27 22:30:27 +0100151 *s_name = DELETED_FLAG;
wdenk71f95112003-06-15 22:40:42 +0000152}
153
Stefan Brünsb8948d22016-12-17 00:27:51 +0100154static int flush_dirty_fat_buffer(fsdata *mydata);
155#if !defined(CONFIG_FAT_WRITE)
156/* Stub for read only operation */
157int flush_dirty_fat_buffer(fsdata *mydata)
158{
159 (void)(mydata);
160 return 0;
161}
162#endif
163
wdenk71f95112003-06-15 22:40:42 +0000164/*
165 * Get the entry at index 'entry' in a FAT (12/16/32) table.
166 * On failure 0x00 is returned.
167 */
Benoît Thébaudeau9795e072012-07-20 15:18:44 +0200168static __u32 get_fatent(fsdata *mydata, __u32 entry)
wdenk71f95112003-06-15 22:40:42 +0000169{
170 __u32 bufnum;
Stefan Brünsb352cae2017-01-26 20:22:36 +0000171 __u32 offset, off8;
wdenk71f95112003-06-15 22:40:42 +0000172 __u32 ret = 0x00;
173
Stefan Brünsb8948d22016-12-17 00:27:51 +0100174 if (CHECK_CLUST(entry, mydata->fatsize)) {
175 printf("Error: Invalid FAT entry: 0x%08x\n", entry);
176 return ret;
177 }
178
wdenk71f95112003-06-15 22:40:42 +0000179 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
Stefan Brünsb8948d22016-12-17 00:27:51 +0100198 debug("FAT%d: entry: 0x%08x = %d, offset: 0x%04x = %d\n",
Wolfgang Denk7385c282010-07-19 11:37:00 +0200199 mydata->fatsize, entry, entry, offset, offset);
Wolfgang Denk2aa98c62010-07-19 11:36:58 +0200200
wdenk71f95112003-06-15 22:40:42 +0000201 /* Read a new block of FAT entries into the cache. */
202 if (bufnum != mydata->fatbufnum) {
Sergei Shtylyov60b36f02011-08-08 09:39:29 +0000203 __u32 getsize = FATBUFBLOCKS;
wdenk71f95112003-06-15 22:40:42 +0000204 __u8 *bufptr = mydata->fatbuf;
205 __u32 fatlength = mydata->fatlength;
206 __u32 startblock = bufnum * FATBUFBLOCKS;
207
Stefan Brüns6c1a8082016-12-17 00:27:50 +0100208 /* Cap length if fatlength is not a multiple of FATBUFBLOCKS */
Benoît Thébaudeau8006dd22012-07-20 15:19:29 +0200209 if (startblock + getsize > fatlength)
210 getsize = fatlength - startblock;
Sergei Shtylyov60b36f02011-08-08 09:39:29 +0000211
wdenk71f95112003-06-15 22:40:42 +0000212 startblock += mydata->fat_sect; /* Offset from start of disk */
213
Stefan Brünsb8948d22016-12-17 00:27:51 +0100214 /* Write back the fatbuf to the disk */
215 if (flush_dirty_fat_buffer(mydata) < 0)
216 return -1;
217
wdenk71f95112003-06-15 22:40:42 +0000218 if (disk_read(startblock, getsize, bufptr) < 0) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200219 debug("Error reading FAT blocks\n");
wdenk71f95112003-06-15 22:40:42 +0000220 return ret;
221 }
222 mydata->fatbufnum = bufnum;
223 }
224
225 /* Get the actual entry from the table */
226 switch (mydata->fatsize) {
227 case 32:
Wolfgang Denk7385c282010-07-19 11:37:00 +0200228 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
wdenk71f95112003-06-15 22:40:42 +0000229 break;
230 case 16:
Wolfgang Denk7385c282010-07-19 11:37:00 +0200231 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
wdenk71f95112003-06-15 22:40:42 +0000232 break;
Wolfgang Denk7385c282010-07-19 11:37:00 +0200233 case 12:
Stefan Brünsb352cae2017-01-26 20:22:36 +0000234 off8 = (offset * 3) / 2;
235 /* fatbut + off8 may be unaligned, read in byte granularity */
236 ret = mydata->fatbuf[off8] + (mydata->fatbuf[off8 + 1] << 8);
wdenk71f95112003-06-15 22:40:42 +0000237
Stefan Brüns8d48c922016-12-17 03:55:10 +0100238 if (offset & 0x1)
239 ret >>= 4;
240 ret &= 0xfff;
wdenk71f95112003-06-15 22:40:42 +0000241 }
Stefan Brünsb8948d22016-12-17 00:27:51 +0100242 debug("FAT%d: ret: 0x%08x, entry: 0x%08x, offset: 0x%04x\n",
243 mydata->fatsize, ret, entry, offset);
wdenk71f95112003-06-15 22:40:42 +0000244
245 return ret;
246}
247
wdenk71f95112003-06-15 22:40:42 +0000248/*
249 * Read at most 'size' bytes from the specified cluster into 'buffer'.
250 * Return 0 on success, -1 otherwise.
251 */
252static int
Benoît Thébaudeau9795e072012-07-20 15:18:44 +0200253get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
wdenk71f95112003-06-15 22:40:42 +0000254{
Erik Hansen3f270f42011-03-24 10:15:37 +0100255 __u32 idx = 0;
wdenk71f95112003-06-15 22:40:42 +0000256 __u32 startsect;
Kyle Moffett46236b12011-12-20 07:41:13 +0000257 int ret;
wdenk71f95112003-06-15 22:40:42 +0000258
259 if (clustnum > 0) {
Rob Clark265edc02017-09-09 13:16:00 -0400260 startsect = clust_to_sect(mydata, clustnum);
wdenk71f95112003-06-15 22:40:42 +0000261 } else {
262 startsect = mydata->rootdir_sect;
263 }
264
Wolfgang Denk7385c282010-07-19 11:37:00 +0200265 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
266
Benoît Thébaudeaucc63b252012-07-20 15:21:08 +0200267 if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
Eric Nelson9a800ac2012-04-11 04:08:53 +0000268 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
Wolfgang Denk7385c282010-07-19 11:37:00 +0200269
Benoît Thébaudeaucc63b252012-07-20 15:21:08 +0200270 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 {
Sergei Shtylyovac497772011-08-08 09:38:33 +0000284 idx = size / mydata->sect_size;
Benoît Thébaudeaucc63b252012-07-20 15:21:08 +0200285 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);
Kyle Moffett46236b12011-12-20 07:41:13 +0000299 if (ret != 1) {
300 debug("Error reading data (got %d)\n", ret);
wdenk7205e402003-09-10 22:30:53 +0000301 return -1;
wdenk71f95112003-06-15 22:40:42 +0000302 }
wdenk7205e402003-09-10 22:30:53 +0000303
Benoît Thébaudeaucc63b252012-07-20 15:21:08 +0200304 memcpy(buffer, tmpbuf, size);
wdenk71f95112003-06-15 22:40:42 +0000305 }
306
307 return 0;
308}
309
wdenk71f95112003-06-15 22:40:42 +0000310/*
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000311 * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr'
wdenk71f95112003-06-15 22:40:42 +0000312 * into 'buffer'.
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800313 * Update the number of bytes read in *gotsize or return -1 on fatal errors.
wdenk71f95112003-06-15 22:40:42 +0000314 */
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000315__u8 get_contents_vfatname_block[MAX_CLUSTSIZE]
316 __aligned(ARCH_DMA_MINALIGN);
317
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800318static int get_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos,
319 __u8 *buffer, loff_t maxsize, loff_t *gotsize)
wdenk71f95112003-06-15 22:40:42 +0000320{
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800321 loff_t filesize = FAT2CPU32(dentptr->size);
Sergei Shtylyovac497772011-08-08 09:38:33 +0000322 unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
wdenk71f95112003-06-15 22:40:42 +0000323 __u32 curclust = START(dentptr);
wdenk7205e402003-09-10 22:30:53 +0000324 __u32 endclust, newclust;
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800325 loff_t actsize;
wdenk71f95112003-06-15 22:40:42 +0000326
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800327 *gotsize = 0;
328 debug("Filesize: %llu bytes\n", filesize);
wdenk71f95112003-06-15 22:40:42 +0000329
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000330 if (pos >= filesize) {
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800331 debug("Read position past EOF: %llu\n", pos);
332 return 0;
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000333 }
334
335 if (maxsize > 0 && filesize > pos + maxsize)
336 filesize = pos + maxsize;
wdenk71f95112003-06-15 22:40:42 +0000337
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800338 debug("%llu bytes\n", filesize);
wdenk71f95112003-06-15 22:40:42 +0000339
Wolfgang Denk7385c282010-07-19 11:37:00 +0200340 actsize = bytesperclust;
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000341
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");
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800348 return 0;
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000349 }
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) {
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800360 actsize = min(filesize, (loff_t)bytesperclust);
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000361 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);
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800369 *gotsize += actsize;
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000370 if (!filesize)
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800371 return 0;
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000372 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");
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800378 return 0;
Benoît Thébaudeau1170e632012-09-18 08:14:56 +0000379 }
380 }
381
382 actsize = bytesperclust;
Wolfgang Denk7385c282010-07-19 11:37:00 +0200383 endclust = curclust;
384
wdenk71f95112003-06-15 22:40:42 +0000385 do {
wdenk7205e402003-09-10 22:30:53 +0000386 /* search for consecutive clusters */
Wolfgang Denk7385c282010-07-19 11:37:00 +0200387 while (actsize < filesize) {
wdenk7205e402003-09-10 22:30:53 +0000388 newclust = get_fatent(mydata, endclust);
Wolfgang Denk7385c282010-07-19 11:37:00 +0200389 if ((newclust - 1) != endclust)
wdenk7205e402003-09-10 22:30:53 +0000390 goto getit;
michael8ce4e5c2008-03-02 23:33:46 +0100391 if (CHECK_CLUST(newclust, mydata->fatsize)) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200392 debug("curclust: 0x%x\n", newclust);
393 debug("Invalid FAT entry\n");
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800394 return 0;
wdenk7205e402003-09-10 22:30:53 +0000395 }
Wolfgang Denk7385c282010-07-19 11:37:00 +0200396 endclust = newclust;
397 actsize += bytesperclust;
wdenk7205e402003-09-10 22:30:53 +0000398 }
Wolfgang Denk7385c282010-07-19 11:37:00 +0200399
wdenk7205e402003-09-10 22:30:53 +0000400 /* get remaining bytes */
Wolfgang Denk7385c282010-07-19 11:37:00 +0200401 actsize = filesize;
Benoît Thébaudeau0880e5b2012-07-20 15:21:37 +0200402 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200403 printf("Error reading cluster\n");
wdenk7205e402003-09-10 22:30:53 +0000404 return -1;
405 }
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800406 *gotsize += actsize;
407 return 0;
wdenk7205e402003-09-10 22:30:53 +0000408getit:
409 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200410 printf("Error reading cluster\n");
wdenk7205e402003-09-10 22:30:53 +0000411 return -1;
412 }
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800413 *gotsize += (int)actsize;
wdenk7205e402003-09-10 22:30:53 +0000414 filesize -= actsize;
415 buffer += actsize;
Wolfgang Denk7385c282010-07-19 11:37:00 +0200416
wdenk7205e402003-09-10 22:30:53 +0000417 curclust = get_fatent(mydata, endclust);
michael8ce4e5c2008-03-02 23:33:46 +0100418 if (CHECK_CLUST(curclust, mydata->fatsize)) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200419 debug("curclust: 0x%x\n", curclust);
420 printf("Invalid FAT entry\n");
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -0800421 return 0;
wdenk71f95112003-06-15 22:40:42 +0000422 }
Wolfgang Denk7385c282010-07-19 11:37:00 +0200423 actsize = bytesperclust;
424 endclust = curclust;
wdenk71f95112003-06-15 22:40:42 +0000425 } while (1);
426}
427
wdenk71f95112003-06-15 22:40:42 +0000428/*
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 */
Benoît Thébaudeau9795e072012-07-20 15:18:44 +0200433static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
wdenk71f95112003-06-15 22:40:42 +0000434{
435 int j;
436
437 for (j = 0; j <= 8; j += 2) {
438 l_name[*idx] = slotptr->name0_4[j];
Wolfgang Denk7385c282010-07-19 11:37:00 +0200439 if (l_name[*idx] == 0x00)
440 return 1;
wdenk71f95112003-06-15 22:40:42 +0000441 (*idx)++;
442 }
443 for (j = 0; j <= 10; j += 2) {
444 l_name[*idx] = slotptr->name5_10[j];
Wolfgang Denk7385c282010-07-19 11:37:00 +0200445 if (l_name[*idx] == 0x00)
446 return 1;
wdenk71f95112003-06-15 22:40:42 +0000447 (*idx)++;
448 }
449 for (j = 0; j <= 2; j += 2) {
450 l_name[*idx] = slotptr->name11_12[j];
Wolfgang Denk7385c282010-07-19 11:37:00 +0200451 if (l_name[*idx] == 0x00)
452 return 1;
wdenk71f95112003-06-15 22:40:42 +0000453 (*idx)++;
454 }
455
456 return 0;
457}
458
wdenk71f95112003-06-15 22:40:42 +0000459/* Calculate short name checksum */
Marek Vasutff04f6d2012-10-09 07:20:22 +0000460static __u8 mkcksum(const char name[8], const char ext[3])
wdenk71f95112003-06-15 22:40:42 +0000461{
462 int i;
Wolfgang Denk7385c282010-07-19 11:37:00 +0200463
wdenk71f95112003-06-15 22:40:42 +0000464 __u8 ret = 0;
465
Marek Vasut6ad77d82013-01-11 03:35:48 +0000466 for (i = 0; i < 8; i++)
Marek Vasutff04f6d2012-10-09 07:20:22 +0000467 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i];
Marek Vasut6ad77d82013-01-11 03:35:48 +0000468 for (i = 0; i < 3; i++)
Marek Vasutff04f6d2012-10-09 07:20:22 +0000469 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i];
wdenk71f95112003-06-15 22:40:42 +0000470
471 return ret;
472}
wdenk71f95112003-06-15 22:40:42 +0000473
474/*
Rob Clark8eafae22017-09-09 13:15:54 -0400475 * TODO these should go away once fat_write is reworked to use the
476 * directory iterator
wdenk71f95112003-06-15 22:40:42 +0000477 */
Eric Nelson9a800ac2012-04-11 04:08:53 +0000478__u8 get_dentfromdir_block[MAX_CLUSTSIZE]
479 __aligned(ARCH_DMA_MINALIGN);
Rob Clark8eafae22017-09-09 13:15:54 -0400480__u8 do_fat_read_at_block[MAX_CLUSTSIZE]
481 __aligned(ARCH_DMA_MINALIGN);
wdenk71f95112003-06-15 22:40:42 +0000482
wdenk71f95112003-06-15 22:40:42 +0000483/*
484 * Read boot sector and volume info from a FAT filesystem
485 */
486static int
Benoît Thébaudeau9795e072012-07-20 15:18:44 +0200487read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
wdenk71f95112003-06-15 22:40:42 +0000488{
Sergei Shtylyovac497772011-08-08 09:38:33 +0000489 __u8 *block;
wdenk71f95112003-06-15 22:40:42 +0000490 volume_info *vistart;
Sergei Shtylyovac497772011-08-08 09:38:33 +0000491 int ret = 0;
492
493 if (cur_dev == NULL) {
494 debug("Error: no device selected\n");
495 return -1;
496 }
497
Tuomas Tynkkynen09fa9642017-10-01 02:25:21 +0300498 block = malloc_cache_aligned(cur_dev->blksz);
Sergei Shtylyovac497772011-08-08 09:38:33 +0000499 if (block == NULL) {
500 debug("Error: allocating block\n");
501 return -1;
502 }
wdenk71f95112003-06-15 22:40:42 +0000503
Benoît Thébaudeau9795e072012-07-20 15:18:44 +0200504 if (disk_read(0, 1, block) < 0) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200505 debug("Error: reading block\n");
Sergei Shtylyovac497772011-08-08 09:38:33 +0000506 goto fail;
wdenk71f95112003-06-15 22:40:42 +0000507 }
508
509 memcpy(bs, block, sizeof(boot_sector));
Wolfgang Denk7385c282010-07-19 11:37:00 +0200510 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);
wdenk71f95112003-06-15 22:40:42 +0000515
516 /* FAT32 entries */
517 if (bs->fat_length == 0) {
518 /* Assume FAT32 */
519 bs->fat32_length = FAT2CPU32(bs->fat32_length);
Wolfgang Denk7385c282010-07-19 11:37:00 +0200520 bs->flags = FAT2CPU16(bs->flags);
wdenk71f95112003-06-15 22:40:42 +0000521 bs->root_cluster = FAT2CPU32(bs->root_cluster);
Wolfgang Denk7385c282010-07-19 11:37:00 +0200522 bs->info_sector = FAT2CPU16(bs->info_sector);
523 bs->backup_boot = FAT2CPU16(bs->backup_boot);
524 vistart = (volume_info *)(block + sizeof(boot_sector));
wdenk71f95112003-06-15 22:40:42 +0000525 *fatsize = 32;
526 } else {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200527 vistart = (volume_info *)&(bs->fat32_length);
wdenk71f95112003-06-15 22:40:42 +0000528 *fatsize = 0;
529 }
530 memcpy(volinfo, vistart, sizeof(volume_info));
531
wdenk71f95112003-06-15 22:40:42 +0000532 if (*fatsize == 32) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200533 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0)
Sergei Shtylyovac497772011-08-08 09:38:33 +0000534 goto exit;
wdenk71f95112003-06-15 22:40:42 +0000535 } else {
Tom Rix651351f2009-05-20 07:55:41 -0500536 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
wdenk71f95112003-06-15 22:40:42 +0000537 *fatsize = 12;
Sergei Shtylyovac497772011-08-08 09:38:33 +0000538 goto exit;
wdenk71f95112003-06-15 22:40:42 +0000539 }
Tom Rix651351f2009-05-20 07:55:41 -0500540 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
wdenk71f95112003-06-15 22:40:42 +0000541 *fatsize = 16;
Sergei Shtylyovac497772011-08-08 09:38:33 +0000542 goto exit;
wdenk71f95112003-06-15 22:40:42 +0000543 }
544 }
545
Wolfgang Denk7385c282010-07-19 11:37:00 +0200546 debug("Error: broken fs_type sign\n");
Sergei Shtylyovac497772011-08-08 09:38:33 +0000547fail:
548 ret = -1;
549exit:
550 free(block);
551 return ret;
wdenk71f95112003-06-15 22:40:42 +0000552}
553
Rob Clark45449982017-09-09 13:15:52 -0400554static int get_fs_info(fsdata *mydata)
wdenk71f95112003-06-15 22:40:42 +0000555{
Wolfgang Denk7385c282010-07-19 11:37:00 +0200556 boot_sector bs;
557 volume_info volinfo;
Rob Clark45449982017-09-09 13:15:52 -0400558 int ret;
wdenk71f95112003-06-15 22:40:42 +0000559
Rob Clark45449982017-09-09 13:15:52 -0400560 ret = read_bootsectandvi(&bs, &volinfo, &mydata->fatsize);
561 if (ret) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200562 debug("Error: reading boot sector\n");
Rob Clark45449982017-09-09 13:15:52 -0400563 return ret;
Wolfgang Denk7385c282010-07-19 11:37:00 +0200564 }
565
Sergei Shtylyov40e21912011-08-19 09:32:34 +0000566 if (mydata->fatsize == 32) {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200567 mydata->fatlength = bs.fat32_length;
Sergei Shtylyov40e21912011-08-19 09:32:34 +0000568 } else {
Wolfgang Denk7385c282010-07-19 11:37:00 +0200569 mydata->fatlength = bs.fat_length;
Sergei Shtylyov40e21912011-08-19 09:32:34 +0000570 }
wdenk71f95112003-06-15 22:40:42 +0000571
Wolfgang Denk7385c282010-07-19 11:37:00 +0200572 mydata->fat_sect = bs.reserved;
wdenk71f95112003-06-15 22:40:42 +0000573
Rob Clark45449982017-09-09 13:15:52 -0400574 mydata->rootdir_sect = mydata->fat_sect + mydata->fatlength * bs.fats;
wdenk71f95112003-06-15 22:40:42 +0000575
Sergei Shtylyovac497772011-08-08 09:38:33 +0000576 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
Wolfgang Denk7385c282010-07-19 11:37:00 +0200577 mydata->clust_size = bs.cluster_size;
Kyle Moffett46236b12011-12-20 07:41:13 +0000578 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 }
wdenk71f95112003-06-15 22:40:42 +0000583
Wolfgang Denk7385c282010-07-19 11:37:00 +0200584 if (mydata->fatsize == 32) {
585 mydata->data_begin = mydata->rootdir_sect -
586 (mydata->clust_size * 2);
Rob Clarkc6e3baa2017-09-09 13:15:53 -0400587 mydata->root_cluster = bs.root_cluster;
Wolfgang Denk7385c282010-07-19 11:37:00 +0200588 } else {
Rob Clark45449982017-09-09 13:15:52 -0400589 mydata->rootdir_size = ((bs.dir_entries[1] * (int)256 +
590 bs.dir_entries[0]) *
591 sizeof(dir_entry)) /
592 mydata->sect_size;
Wolfgang Denk7385c282010-07-19 11:37:00 +0200593 mydata->data_begin = mydata->rootdir_sect +
Rob Clark45449982017-09-09 13:15:52 -0400594 mydata->rootdir_size -
Wolfgang Denk7385c282010-07-19 11:37:00 +0200595 (mydata->clust_size * 2);
Rob Clark265edc02017-09-09 13:16:00 -0400596 mydata->root_cluster =
597 sect_to_clust(mydata, mydata->rootdir_sect);
wdenk71f95112003-06-15 22:40:42 +0000598 }
wdenk71f95112003-06-15 22:40:42 +0000599
Wolfgang Denk7385c282010-07-19 11:37:00 +0200600 mydata->fatbufnum = -1;
Stefan Brüns3c0ed9c2016-09-11 22:51:40 +0200601 mydata->fat_dirty = 0;
Tuomas Tynkkynen09fa9642017-10-01 02:25:21 +0300602 mydata->fatbuf = malloc_cache_aligned(FATBUFSIZE);
Sergei Shtylyovac497772011-08-08 09:38:33 +0000603 if (mydata->fatbuf == NULL) {
604 debug("Error: allocating memory\n");
605 return -1;
606 }
Wolfgang Denk7385c282010-07-19 11:37:00 +0200607
Richard Genoudcb940c72012-12-13 03:30:10 +0000608 if (vfat_enabled)
609 debug("VFAT Support enabled\n");
610
Wolfgang Denk7385c282010-07-19 11:37:00 +0200611 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",
Rob Clarkc6e3baa2017-09-09 13:15:53 -0400615 mydata->root_cluster,
Wolfgang Denk7385c282010-07-19 11:37:00 +0200616 mydata->rootdir_sect,
Sergei Shtylyovac497772011-08-08 09:38:33 +0000617 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);
Wolfgang Denk7385c282010-07-19 11:37:00 +0200620
Rob Clark45449982017-09-09 13:15:52 -0400621 return 0;
622}
623
Rob Clarkc6e3baa2017-09-09 13:15:53 -0400624
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
644typedef 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
661static 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 */
671static 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 */
703static 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;
Tuomas Tynkkynen8df87312017-09-25 22:06:33 +0300713 itr->is_root = 0;
Rob Clarkc6e3baa2017-09-09 13:15:53 -0400714 } else {
715 itr->clust = parent->fsdata->root_cluster;
Tuomas Tynkkynen8df87312017-09-25 22:06:33 +0300716 itr->is_root = 1;
Rob Clarkc6e3baa2017-09-09 13:15:53 -0400717 }
718 itr->dent = NULL;
719 itr->remaining = 0;
720 itr->last_cluster = 0;
Rob Clarkc6e3baa2017-09-09 13:15:53 -0400721}
722
723static void *next_cluster(fat_itr *itr)
724{
725 fsdata *mydata = itr->fsdata; /* for silly macros */
726 int ret;
727 u32 sect;
728
729 /* have we reached the end? */
730 if (itr->last_cluster)
731 return NULL;
732
733 sect = clust_to_sect(itr->fsdata, itr->clust);
734
735 debug("FAT read(sect=%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n",
736 sect, itr->fsdata->clust_size, DIRENTSPERBLOCK);
737
738 /*
739 * NOTE: do_fat_read_at() had complicated logic to deal w/
740 * vfat names that span multiple clusters in the fat16 case,
741 * which get_dentfromdir() probably also needed (and was
742 * missing). And not entirely sure what fat32 didn't have
743 * the same issue.. We solve that by only caring about one
744 * dent at a time and iteratively constructing the vfat long
745 * name.
746 */
747 ret = disk_read(sect, itr->fsdata->clust_size,
748 itr->block);
749 if (ret < 0) {
750 debug("Error: reading block\n");
751 return NULL;
752 }
753
754 if (itr->is_root && itr->fsdata->fatsize != 32) {
755 itr->clust++;
756 sect = clust_to_sect(itr->fsdata, itr->clust);
757 if (sect - itr->fsdata->rootdir_sect >=
758 itr->fsdata->rootdir_size) {
759 debug("cursect: 0x%x\n", itr->clust);
760 itr->last_cluster = 1;
761 }
762 } else {
763 itr->clust = get_fatent(itr->fsdata, itr->clust);
764 if (CHECK_CLUST(itr->clust, itr->fsdata->fatsize)) {
765 debug("cursect: 0x%x\n", itr->clust);
766 itr->last_cluster = 1;
767 }
768 }
769
770 return itr->block;
771}
772
773static dir_entry *next_dent(fat_itr *itr)
774{
775 if (itr->remaining == 0) {
776 struct dir_entry *dent = next_cluster(itr);
777 unsigned nbytes = itr->fsdata->sect_size *
778 itr->fsdata->clust_size;
779
780 /* have we reached the last cluster? */
781 if (!dent)
782 return NULL;
783
784 itr->remaining = nbytes / sizeof(dir_entry) - 1;
785 itr->dent = dent;
786 } else {
787 itr->remaining--;
788 itr->dent++;
789 }
790
791 /* have we reached the last valid entry? */
792 if (itr->dent->name[0] == 0)
793 return NULL;
794
795 return itr->dent;
796}
797
798static dir_entry *extract_vfat_name(fat_itr *itr)
799{
800 struct dir_entry *dent = itr->dent;
801 int seqn = itr->dent->name[0] & ~LAST_LONG_ENTRY_MASK;
802 u8 chksum, alias_checksum = ((dir_slot *)dent)->alias_checksum;
803 int n = 0;
804
805 while (seqn--) {
806 char buf[13];
807 int idx = 0;
808
809 slot2str((dir_slot *)dent, buf, &idx);
810
811 /* shift accumulated long-name up and copy new part in: */
812 memmove(itr->l_name + idx, itr->l_name, n);
813 memcpy(itr->l_name, buf, idx);
814 n += idx;
815
816 dent = next_dent(itr);
817 if (!dent)
818 return NULL;
819 }
820
821 itr->l_name[n] = '\0';
822
823 chksum = mkcksum(dent->name, dent->ext);
824
825 /* checksum mismatch could mean deleted file, etc.. skip it: */
826 if (chksum != alias_checksum) {
827 debug("** chksum=%x, alias_checksum=%x, l_name=%s, s_name=%8s.%3s\n",
828 chksum, alias_checksum, itr->l_name, dent->name, dent->ext);
829 return NULL;
830 }
831
832 return dent;
833}
834
835/**
836 * fat_itr_next() - step to the next entry in a directory
837 *
838 * Must be called once on a new iterator before the cursor is valid.
839 *
840 * @itr: the iterator to iterate
841 * @return boolean, 1 if success or 0 if no more entries in the
842 * current directory
843 */
844static int fat_itr_next(fat_itr *itr)
845{
846 dir_entry *dent;
847
848 itr->name = NULL;
849
850 while (1) {
851 dent = next_dent(itr);
852 if (!dent)
853 return 0;
854
855 if (dent->name[0] == DELETED_FLAG ||
856 dent->name[0] == aRING)
857 continue;
858
859 if (dent->attr & ATTR_VOLUME) {
860 if (vfat_enabled &&
861 (dent->attr & ATTR_VFAT) == ATTR_VFAT &&
862 (dent->name[0] & LAST_LONG_ENTRY_MASK)) {
863 dent = extract_vfat_name(itr);
864 if (!dent)
865 continue;
866 itr->name = itr->l_name;
867 break;
868 } else {
869 /* Volume label or VFAT entry, skip */
870 continue;
871 }
872 }
873
874 break;
875 }
876
877 get_name(dent, itr->s_name);
878 if (!itr->name)
879 itr->name = itr->s_name;
880
881 return 1;
882}
883
884/**
885 * fat_itr_isdir() - is current cursor position pointing to a directory
886 *
887 * @itr: the iterator
888 * @return true if cursor is at a directory
889 */
890static int fat_itr_isdir(fat_itr *itr)
891{
892 return !!(itr->dent->attr & ATTR_DIR);
893}
894
895/*
896 * Helpers:
897 */
898
899#define TYPE_FILE 0x1
900#define TYPE_DIR 0x2
901#define TYPE_ANY (TYPE_FILE | TYPE_DIR)
902
903/**
904 * fat_itr_resolve() - traverse directory structure to resolve the
905 * requested path.
906 *
907 * Traverse directory structure to the requested path. If the specified
908 * path is to a directory, this will descend into the directory and
909 * leave it iterator at the start of the directory. If the path is to a
910 * file, it will leave the iterator in the parent directory with current
911 * cursor at file's entry in the directory.
912 *
913 * @itr: iterator initialized to root
914 * @path: the requested path
915 * @type: bitmask of allowable file types
916 * @return 0 on success or -errno
917 */
918static int fat_itr_resolve(fat_itr *itr, const char *path, unsigned type)
919{
920 const char *next;
921
922 /* chomp any extra leading slashes: */
923 while (path[0] && ISDIRDELIM(path[0]))
924 path++;
925
926 /* are we at the end? */
927 if (strlen(path) == 0) {
928 if (!(type & TYPE_DIR))
929 return -ENOENT;
930 return 0;
931 }
932
933 /* find length of next path entry: */
934 next = path;
935 while (next[0] && !ISDIRDELIM(next[0]))
936 next++;
937
938 while (fat_itr_next(itr)) {
939 int match = 0;
940 unsigned n = max(strlen(itr->name), (size_t)(next - path));
941
942 /* check both long and short name: */
943 if (!strncasecmp(path, itr->name, n))
944 match = 1;
945 else if (itr->name != itr->s_name &&
946 !strncasecmp(path, itr->s_name, n))
947 match = 1;
948
949 if (!match)
950 continue;
951
952 if (fat_itr_isdir(itr)) {
953 /* recurse into directory: */
954 fat_itr_child(itr, itr);
955 return fat_itr_resolve(itr, next, type);
956 } else if (next[0]) {
957 /*
958 * If next is not empty then we have a case
959 * like: /path/to/realfile/nonsense
960 */
961 debug("bad trailing path: %s\n", next);
962 return -ENOENT;
963 } else if (!(type & TYPE_FILE)) {
964 return -ENOTDIR;
965 } else {
966 return 0;
967 }
968 }
969
970 return -ENOENT;
971}
972
Benoît Thébaudeau9795e072012-07-20 15:18:44 +0200973int file_fat_detectfs(void)
wdenk71f95112003-06-15 22:40:42 +0000974{
Wolfgang Denk7385c282010-07-19 11:37:00 +0200975 boot_sector bs;
976 volume_info volinfo;
977 int fatsize;
978 char vol_label[12];
wdenk71f95112003-06-15 22:40:42 +0000979
Wolfgang Denk7385c282010-07-19 11:37:00 +0200980 if (cur_dev == NULL) {
wdenk7205e402003-09-10 22:30:53 +0000981 printf("No current device\n");
982 return 1;
983 }
Wolfgang Denk7385c282010-07-19 11:37:00 +0200984
Simon Glassfc843a02017-05-17 03:25:30 -0600985#if defined(CONFIG_IDE) || \
Simon Glass10e40d52017-06-14 21:28:25 -0600986 defined(CONFIG_SATA) || \
Simon Glassc649e3c2016-05-01 11:36:02 -0600987 defined(CONFIG_SCSI) || \
Jon Loeligerdd60d122007-07-09 17:56:50 -0500988 defined(CONFIG_CMD_USB) || \
Andy Fleming21f6f962008-01-16 13:06:59 -0600989 defined(CONFIG_MMC)
wdenk7205e402003-09-10 22:30:53 +0000990 printf("Interface: ");
Wolfgang Denk7385c282010-07-19 11:37:00 +0200991 switch (cur_dev->if_type) {
992 case IF_TYPE_IDE:
993 printf("IDE");
994 break;
995 case IF_TYPE_SATA:
996 printf("SATA");
997 break;
998 case IF_TYPE_SCSI:
999 printf("SCSI");
1000 break;
1001 case IF_TYPE_ATAPI:
1002 printf("ATAPI");
1003 break;
1004 case IF_TYPE_USB:
1005 printf("USB");
1006 break;
1007 case IF_TYPE_DOC:
1008 printf("DOC");
1009 break;
1010 case IF_TYPE_MMC:
1011 printf("MMC");
1012 break;
1013 default:
1014 printf("Unknown");
wdenk7205e402003-09-10 22:30:53 +00001015 }
Wolfgang Denk7385c282010-07-19 11:37:00 +02001016
Simon Glassbcce53d2016-02-29 15:25:51 -07001017 printf("\n Device %d: ", cur_dev->devnum);
wdenk7205e402003-09-10 22:30:53 +00001018 dev_print(cur_dev);
1019#endif
Wolfgang Denk7385c282010-07-19 11:37:00 +02001020
1021 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) {
wdenk7205e402003-09-10 22:30:53 +00001022 printf("\nNo valid FAT fs found\n");
1023 return 1;
1024 }
Wolfgang Denk7385c282010-07-19 11:37:00 +02001025
1026 memcpy(vol_label, volinfo.volume_label, 11);
wdenk7205e402003-09-10 22:30:53 +00001027 vol_label[11] = '\0';
Wolfgang Denk7385c282010-07-19 11:37:00 +02001028 volinfo.fs_type[5] = '\0';
1029
Stephen Warren461f86e2012-10-17 06:44:57 +00001030 printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label);
Wolfgang Denk7385c282010-07-19 11:37:00 +02001031
wdenk7205e402003-09-10 22:30:53 +00001032 return 0;
wdenk71f95112003-06-15 22:40:42 +00001033}
1034
Stephen Warrenb7b5f312014-02-03 13:21:10 -07001035int fat_exists(const char *filename)
1036{
Rob Clark8eafae22017-09-09 13:15:54 -04001037 fsdata fsdata;
Tom Rini24600982017-09-22 07:37:43 -04001038 fat_itr *itr;
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -08001039 int ret;
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -08001040
Tuomas Tynkkynen09fa9642017-10-01 02:25:21 +03001041 itr = malloc_cache_aligned(sizeof(fat_itr));
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001042 if (!itr)
1043 return 0;
Rob Clark8eafae22017-09-09 13:15:54 -04001044 ret = fat_itr_root(itr, &fsdata);
1045 if (ret)
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001046 goto out;
Rob Clark8eafae22017-09-09 13:15:54 -04001047
1048 ret = fat_itr_resolve(itr, filename, TYPE_ANY);
Rob Clark725ffdb2017-09-12 16:40:01 -04001049 free(fsdata.fatbuf);
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001050out:
Tom Rini24600982017-09-22 07:37:43 -04001051 free(itr);
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -08001052 return ret == 0;
Stephen Warrenb7b5f312014-02-03 13:21:10 -07001053}
1054
Suriyan Ramasamid455d872014-11-17 14:39:38 -08001055int fat_size(const char *filename, loff_t *size)
Stephen Warrencf659812014-06-11 12:47:26 -06001056{
Rob Clark8eafae22017-09-09 13:15:54 -04001057 fsdata fsdata;
Tom Rini24600982017-09-22 07:37:43 -04001058 fat_itr *itr;
Rob Clark8eafae22017-09-09 13:15:54 -04001059 int ret;
1060
Tuomas Tynkkynen09fa9642017-10-01 02:25:21 +03001061 itr = malloc_cache_aligned(sizeof(fat_itr));
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001062 if (!itr)
1063 return -ENOMEM;
Rob Clark8eafae22017-09-09 13:15:54 -04001064 ret = fat_itr_root(itr, &fsdata);
1065 if (ret)
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001066 goto out_free_itr;
Rob Clark8eafae22017-09-09 13:15:54 -04001067
1068 ret = fat_itr_resolve(itr, filename, TYPE_FILE);
1069 if (ret) {
1070 /*
1071 * Directories don't have size, but fs_size() is not
1072 * expected to fail if passed a directory path:
1073 */
Rob Clark725ffdb2017-09-12 16:40:01 -04001074 free(fsdata.fatbuf);
Rob Clark8eafae22017-09-09 13:15:54 -04001075 fat_itr_root(itr, &fsdata);
1076 if (!fat_itr_resolve(itr, filename, TYPE_DIR)) {
1077 *size = 0;
Rob Clark725ffdb2017-09-12 16:40:01 -04001078 ret = 0;
Rob Clark8eafae22017-09-09 13:15:54 -04001079 }
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001080 goto out_free_both;
Rob Clark8eafae22017-09-09 13:15:54 -04001081 }
1082
1083 *size = FAT2CPU32(itr->dent->size);
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001084out_free_both:
Rob Clark725ffdb2017-09-12 16:40:01 -04001085 free(fsdata.fatbuf);
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001086out_free_itr:
Tom Rini24600982017-09-22 07:37:43 -04001087 free(itr);
Rob Clark725ffdb2017-09-12 16:40:01 -04001088 return ret;
Stephen Warrencf659812014-06-11 12:47:26 -06001089}
1090
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -08001091int file_fat_read_at(const char *filename, loff_t pos, void *buffer,
1092 loff_t maxsize, loff_t *actread)
wdenk71f95112003-06-15 22:40:42 +00001093{
Rob Clark8eafae22017-09-09 13:15:54 -04001094 fsdata fsdata;
Tom Rini24600982017-09-22 07:37:43 -04001095 fat_itr *itr;
Rob Clark8eafae22017-09-09 13:15:54 -04001096 int ret;
1097
Tuomas Tynkkynen09fa9642017-10-01 02:25:21 +03001098 itr = malloc_cache_aligned(sizeof(fat_itr));
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001099 if (!itr)
1100 return -ENOMEM;
Rob Clark8eafae22017-09-09 13:15:54 -04001101 ret = fat_itr_root(itr, &fsdata);
1102 if (ret)
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001103 goto out_free_itr;
Rob Clark8eafae22017-09-09 13:15:54 -04001104
1105 ret = fat_itr_resolve(itr, filename, TYPE_FILE);
1106 if (ret)
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001107 goto out_free_both;
Rob Clark8eafae22017-09-09 13:15:54 -04001108
Heinrich Schuchardtd2f71582018-01-01 21:31:58 +01001109 debug("reading %s\n", filename);
Rob Clark725ffdb2017-09-12 16:40:01 -04001110 ret = get_contents(&fsdata, itr->dent, pos, buffer, maxsize, actread);
1111
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001112out_free_both:
Rob Clark725ffdb2017-09-12 16:40:01 -04001113 free(fsdata.fatbuf);
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001114out_free_itr:
Tom Rini24600982017-09-22 07:37:43 -04001115 free(itr);
Rob Clark725ffdb2017-09-12 16:40:01 -04001116 return ret;
Benoît Thébaudeau1170e632012-09-18 08:14:56 +00001117}
1118
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -08001119int file_fat_read(const char *filename, void *buffer, int maxsize)
Benoît Thébaudeau1170e632012-09-18 08:14:56 +00001120{
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -08001121 loff_t actread;
1122 int ret;
1123
1124 ret = file_fat_read_at(filename, 0, buffer, maxsize, &actread);
1125 if (ret)
1126 return ret;
1127 else
1128 return actread;
wdenk71f95112003-06-15 22:40:42 +00001129}
Simon Glasse6d52412012-12-26 09:53:33 +00001130
Suriyan Ramasamid455d872014-11-17 14:39:38 -08001131int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
1132 loff_t *actread)
Simon Glasse6d52412012-12-26 09:53:33 +00001133{
Suriyan Ramasami1ad0b982014-11-17 14:39:35 -08001134 int ret;
Simon Glasse6d52412012-12-26 09:53:33 +00001135
Suriyan Ramasamid455d872014-11-17 14:39:38 -08001136 ret = file_fat_read_at(filename, offset, buf, len, actread);
1137 if (ret)
Simon Glasse6d52412012-12-26 09:53:33 +00001138 printf("** Unable to read file %s **\n", filename);
Simon Glasse6d52412012-12-26 09:53:33 +00001139
Suriyan Ramasamid455d872014-11-17 14:39:38 -08001140 return ret;
Simon Glasse6d52412012-12-26 09:53:33 +00001141}
1142
Rob Clark1f403662017-09-09 13:15:56 -04001143typedef struct {
1144 struct fs_dir_stream parent;
1145 struct fs_dirent dirent;
1146 fsdata fsdata;
1147 fat_itr itr;
1148} fat_dir;
1149
1150int fat_opendir(const char *filename, struct fs_dir_stream **dirsp)
1151{
Neil Armstrong34dd8532017-11-24 09:54:41 +01001152 fat_dir *dir;
Rob Clark1f403662017-09-09 13:15:56 -04001153 int ret;
1154
Neil Armstrong34dd8532017-11-24 09:54:41 +01001155 dir = malloc_cache_aligned(sizeof(*dir));
Rob Clark1f403662017-09-09 13:15:56 -04001156 if (!dir)
1157 return -ENOMEM;
Neil Armstrong34dd8532017-11-24 09:54:41 +01001158 memset(dir, 0, sizeof(*dir));
Rob Clark1f403662017-09-09 13:15:56 -04001159
1160 ret = fat_itr_root(&dir->itr, &dir->fsdata);
1161 if (ret)
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001162 goto fail_free_dir;
Rob Clark1f403662017-09-09 13:15:56 -04001163
1164 ret = fat_itr_resolve(&dir->itr, filename, TYPE_DIR);
1165 if (ret)
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001166 goto fail_free_both;
Rob Clark1f403662017-09-09 13:15:56 -04001167
1168 *dirsp = (struct fs_dir_stream *)dir;
1169 return 0;
1170
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001171fail_free_both:
Rob Clark725ffdb2017-09-12 16:40:01 -04001172 free(dir->fsdata.fatbuf);
Tuomas Tynkkynenaf609e32017-10-01 02:25:22 +03001173fail_free_dir:
Rob Clark1f403662017-09-09 13:15:56 -04001174 free(dir);
1175 return ret;
1176}
1177
1178int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp)
1179{
1180 fat_dir *dir = (fat_dir *)dirs;
1181 struct fs_dirent *dent = &dir->dirent;
1182
1183 if (!fat_itr_next(&dir->itr))
1184 return -ENOENT;
1185
1186 memset(dent, 0, sizeof(*dent));
1187 strcpy(dent->name, dir->itr.name);
1188
1189 if (fat_itr_isdir(&dir->itr)) {
1190 dent->type = FS_DT_DIR;
1191 } else {
1192 dent->type = FS_DT_REG;
1193 dent->size = FAT2CPU32(dir->itr.dent->size);
1194 }
1195
1196 *dentp = dent;
1197
1198 return 0;
1199}
1200
1201void fat_closedir(struct fs_dir_stream *dirs)
1202{
1203 fat_dir *dir = (fat_dir *)dirs;
Rob Clark725ffdb2017-09-12 16:40:01 -04001204 free(dir->fsdata.fatbuf);
Rob Clark1f403662017-09-09 13:15:56 -04001205 free(dir);
1206}
1207
Simon Glasse6d52412012-12-26 09:53:33 +00001208void fat_close(void)
1209{
1210}