Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1 | /* |
| 2 | * fat_write.c |
| 3 | * |
| 4 | * R/W (V)FAT 12/16/32 filesystem implementation by Donggeun Kim |
| 5 | * |
Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 6 | * SPDX-License-Identifier: GPL-2.0+ |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include <common.h> |
| 10 | #include <command.h> |
| 11 | #include <config.h> |
| 12 | #include <fat.h> |
| 13 | #include <asm/byteorder.h> |
| 14 | #include <part.h> |
Richard Genoud | 2e37202 | 2012-12-13 00:47:36 +0000 | [diff] [blame] | 15 | #include <linux/ctype.h> |
Tom Rini | a17b7bc | 2014-11-24 11:50:46 -0500 | [diff] [blame] | 16 | #include <div64.h> |
| 17 | #include <linux/math64.h> |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 18 | #include "fat.c" |
| 19 | |
| 20 | static void uppercase(char *str, int len) |
| 21 | { |
| 22 | int i; |
| 23 | |
| 24 | for (i = 0; i < len; i++) { |
Richard Genoud | 2e37202 | 2012-12-13 00:47:36 +0000 | [diff] [blame] | 25 | *str = toupper(*str); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 26 | str++; |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | static int total_sector; |
Donggeun Kim | cb5f3bc | 2012-03-22 04:38:55 +0000 | [diff] [blame] | 31 | static int disk_write(__u32 block, __u32 nr_blocks, void *buf) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 32 | { |
Donggeun Kim | cb5f3bc | 2012-03-22 04:38:55 +0000 | [diff] [blame] | 33 | if (!cur_dev || !cur_dev->block_write) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 34 | return -1; |
| 35 | |
Donggeun Kim | cb5f3bc | 2012-03-22 04:38:55 +0000 | [diff] [blame] | 36 | if (cur_part_info.start + block + nr_blocks > |
| 37 | cur_part_info.start + total_sector) { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 38 | printf("error: overflow occurs\n"); |
| 39 | return -1; |
| 40 | } |
| 41 | |
Donggeun Kim | cb5f3bc | 2012-03-22 04:38:55 +0000 | [diff] [blame] | 42 | return cur_dev->block_write(cur_dev->dev, |
| 43 | cur_part_info.start + block, nr_blocks, buf); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | /* |
| 47 | * Set short name in directory entry |
| 48 | */ |
| 49 | static void set_name(dir_entry *dirent, const char *filename) |
| 50 | { |
| 51 | char s_name[VFAT_MAXLEN_BYTES]; |
| 52 | char *period; |
| 53 | int period_location, len, i, ext_num; |
| 54 | |
| 55 | if (filename == NULL) |
| 56 | return; |
| 57 | |
| 58 | len = strlen(filename); |
| 59 | if (len == 0) |
| 60 | return; |
| 61 | |
Piotr Wilczek | 65a43e3 | 2013-10-11 15:43:33 +0200 | [diff] [blame] | 62 | strcpy(s_name, filename); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 63 | uppercase(s_name, len); |
| 64 | |
| 65 | period = strchr(s_name, '.'); |
| 66 | if (period == NULL) { |
| 67 | period_location = len; |
| 68 | ext_num = 0; |
| 69 | } else { |
| 70 | period_location = period - s_name; |
| 71 | ext_num = len - period_location - 1; |
| 72 | } |
| 73 | |
| 74 | /* Pad spaces when the length of file name is shorter than eight */ |
| 75 | if (period_location < 8) { |
| 76 | memcpy(dirent->name, s_name, period_location); |
| 77 | for (i = period_location; i < 8; i++) |
| 78 | dirent->name[i] = ' '; |
| 79 | } else if (period_location == 8) { |
| 80 | memcpy(dirent->name, s_name, period_location); |
| 81 | } else { |
| 82 | memcpy(dirent->name, s_name, 6); |
| 83 | dirent->name[6] = '~'; |
| 84 | dirent->name[7] = '1'; |
| 85 | } |
| 86 | |
| 87 | if (ext_num < 3) { |
| 88 | memcpy(dirent->ext, s_name + period_location + 1, ext_num); |
| 89 | for (i = ext_num; i < 3; i++) |
| 90 | dirent->ext[i] = ' '; |
| 91 | } else |
| 92 | memcpy(dirent->ext, s_name + period_location + 1, 3); |
| 93 | |
| 94 | debug("name : %s\n", dirent->name); |
| 95 | debug("ext : %s\n", dirent->ext); |
| 96 | } |
| 97 | |
Donggeun Kim | af57ce2 | 2011-12-20 18:34:27 +0000 | [diff] [blame] | 98 | static __u8 num_of_fats; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 99 | /* |
| 100 | * Write fat buffer into block device |
| 101 | */ |
| 102 | static int flush_fat_buffer(fsdata *mydata) |
| 103 | { |
| 104 | int getsize = FATBUFBLOCKS; |
| 105 | __u32 fatlength = mydata->fatlength; |
| 106 | __u8 *bufptr = mydata->fatbuf; |
| 107 | __u32 startblock = mydata->fatbufnum * FATBUFBLOCKS; |
| 108 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 109 | startblock += mydata->fat_sect; |
| 110 | |
| 111 | if (getsize > fatlength) |
| 112 | getsize = fatlength; |
| 113 | |
| 114 | /* Write FAT buf */ |
| 115 | if (disk_write(startblock, getsize, bufptr) < 0) { |
| 116 | debug("error: writing FAT blocks\n"); |
| 117 | return -1; |
| 118 | } |
| 119 | |
Donggeun Kim | af57ce2 | 2011-12-20 18:34:27 +0000 | [diff] [blame] | 120 | if (num_of_fats == 2) { |
| 121 | /* Update corresponding second FAT blocks */ |
| 122 | startblock += mydata->fatlength; |
| 123 | if (disk_write(startblock, getsize, bufptr) < 0) { |
| 124 | debug("error: writing second FAT blocks\n"); |
| 125 | return -1; |
| 126 | } |
| 127 | } |
| 128 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | /* |
| 133 | * Get the entry at index 'entry' in a FAT (12/16/32) table. |
| 134 | * On failure 0x00 is returned. |
| 135 | * When bufnum is changed, write back the previous fatbuf to the disk. |
| 136 | */ |
| 137 | static __u32 get_fatent_value(fsdata *mydata, __u32 entry) |
| 138 | { |
| 139 | __u32 bufnum; |
| 140 | __u32 off16, offset; |
| 141 | __u32 ret = 0x00; |
| 142 | __u16 val1, val2; |
| 143 | |
Wu, Josh | 675b23c | 2014-05-08 16:14:07 +0800 | [diff] [blame] | 144 | if (CHECK_CLUST(entry, mydata->fatsize)) { |
| 145 | printf("Error: Invalid FAT entry: 0x%08x\n", entry); |
| 146 | return ret; |
| 147 | } |
| 148 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 149 | switch (mydata->fatsize) { |
| 150 | case 32: |
| 151 | bufnum = entry / FAT32BUFSIZE; |
| 152 | offset = entry - bufnum * FAT32BUFSIZE; |
| 153 | break; |
| 154 | case 16: |
| 155 | bufnum = entry / FAT16BUFSIZE; |
| 156 | offset = entry - bufnum * FAT16BUFSIZE; |
| 157 | break; |
| 158 | case 12: |
| 159 | bufnum = entry / FAT12BUFSIZE; |
| 160 | offset = entry - bufnum * FAT12BUFSIZE; |
| 161 | break; |
| 162 | |
| 163 | default: |
| 164 | /* Unsupported FAT size */ |
| 165 | return ret; |
| 166 | } |
| 167 | |
| 168 | debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n", |
| 169 | mydata->fatsize, entry, entry, offset, offset); |
| 170 | |
| 171 | /* Read a new block of FAT entries into the cache. */ |
| 172 | if (bufnum != mydata->fatbufnum) { |
| 173 | int getsize = FATBUFBLOCKS; |
| 174 | __u8 *bufptr = mydata->fatbuf; |
| 175 | __u32 fatlength = mydata->fatlength; |
| 176 | __u32 startblock = bufnum * FATBUFBLOCKS; |
| 177 | |
| 178 | if (getsize > fatlength) |
| 179 | getsize = fatlength; |
| 180 | |
| 181 | fatlength *= mydata->sect_size; /* We want it in bytes now */ |
| 182 | startblock += mydata->fat_sect; /* Offset from start of disk */ |
| 183 | |
| 184 | /* Write back the fatbuf to the disk */ |
| 185 | if (mydata->fatbufnum != -1) { |
| 186 | if (flush_fat_buffer(mydata) < 0) |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | if (disk_read(startblock, getsize, bufptr) < 0) { |
| 191 | debug("Error reading FAT blocks\n"); |
| 192 | return ret; |
| 193 | } |
| 194 | mydata->fatbufnum = bufnum; |
| 195 | } |
| 196 | |
| 197 | /* Get the actual entry from the table */ |
| 198 | switch (mydata->fatsize) { |
| 199 | case 32: |
| 200 | ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]); |
| 201 | break; |
| 202 | case 16: |
| 203 | ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]); |
| 204 | break; |
| 205 | case 12: |
| 206 | off16 = (offset * 3) / 4; |
| 207 | |
| 208 | switch (offset & 0x3) { |
| 209 | case 0: |
| 210 | ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]); |
| 211 | ret &= 0xfff; |
| 212 | break; |
| 213 | case 1: |
| 214 | val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); |
| 215 | val1 &= 0xf000; |
| 216 | val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); |
| 217 | val2 &= 0x00ff; |
| 218 | ret = (val2 << 4) | (val1 >> 12); |
| 219 | break; |
| 220 | case 2: |
| 221 | val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); |
| 222 | val1 &= 0xff00; |
| 223 | val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); |
| 224 | val2 &= 0x000f; |
| 225 | ret = (val2 << 8) | (val1 >> 8); |
| 226 | break; |
| 227 | case 3: |
| 228 | ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); |
| 229 | ret = (ret & 0xfff0) >> 4; |
| 230 | break; |
| 231 | default: |
| 232 | break; |
| 233 | } |
| 234 | break; |
| 235 | } |
| 236 | debug("FAT%d: ret: %08x, entry: %08x, offset: %04x\n", |
| 237 | mydata->fatsize, ret, entry, offset); |
| 238 | |
| 239 | return ret; |
| 240 | } |
| 241 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 242 | /* |
| 243 | * Set the file name information from 'name' into 'slotptr', |
| 244 | */ |
| 245 | static int str2slot(dir_slot *slotptr, const char *name, int *idx) |
| 246 | { |
| 247 | int j, end_idx = 0; |
| 248 | |
| 249 | for (j = 0; j <= 8; j += 2) { |
| 250 | if (name[*idx] == 0x00) { |
| 251 | slotptr->name0_4[j] = 0; |
| 252 | slotptr->name0_4[j + 1] = 0; |
| 253 | end_idx++; |
| 254 | goto name0_4; |
| 255 | } |
| 256 | slotptr->name0_4[j] = name[*idx]; |
| 257 | (*idx)++; |
| 258 | end_idx++; |
| 259 | } |
| 260 | for (j = 0; j <= 10; j += 2) { |
| 261 | if (name[*idx] == 0x00) { |
| 262 | slotptr->name5_10[j] = 0; |
| 263 | slotptr->name5_10[j + 1] = 0; |
| 264 | end_idx++; |
| 265 | goto name5_10; |
| 266 | } |
| 267 | slotptr->name5_10[j] = name[*idx]; |
| 268 | (*idx)++; |
| 269 | end_idx++; |
| 270 | } |
| 271 | for (j = 0; j <= 2; j += 2) { |
| 272 | if (name[*idx] == 0x00) { |
| 273 | slotptr->name11_12[j] = 0; |
| 274 | slotptr->name11_12[j + 1] = 0; |
| 275 | end_idx++; |
| 276 | goto name11_12; |
| 277 | } |
| 278 | slotptr->name11_12[j] = name[*idx]; |
| 279 | (*idx)++; |
| 280 | end_idx++; |
| 281 | } |
| 282 | |
| 283 | if (name[*idx] == 0x00) |
| 284 | return 1; |
| 285 | |
| 286 | return 0; |
| 287 | /* Not used characters are filled with 0xff 0xff */ |
| 288 | name0_4: |
| 289 | for (; end_idx < 5; end_idx++) { |
| 290 | slotptr->name0_4[end_idx * 2] = 0xff; |
| 291 | slotptr->name0_4[end_idx * 2 + 1] = 0xff; |
| 292 | } |
| 293 | end_idx = 5; |
| 294 | name5_10: |
| 295 | end_idx -= 5; |
| 296 | for (; end_idx < 6; end_idx++) { |
| 297 | slotptr->name5_10[end_idx * 2] = 0xff; |
| 298 | slotptr->name5_10[end_idx * 2 + 1] = 0xff; |
| 299 | } |
| 300 | end_idx = 11; |
| 301 | name11_12: |
| 302 | end_idx -= 11; |
| 303 | for (; end_idx < 2; end_idx++) { |
| 304 | slotptr->name11_12[end_idx * 2] = 0xff; |
| 305 | slotptr->name11_12[end_idx * 2 + 1] = 0xff; |
| 306 | } |
| 307 | |
| 308 | return 1; |
| 309 | } |
| 310 | |
| 311 | static int is_next_clust(fsdata *mydata, dir_entry *dentptr); |
| 312 | static void flush_dir_table(fsdata *mydata, dir_entry **dentptr); |
| 313 | |
| 314 | /* |
| 315 | * Fill dir_slot entries with appropriate name, id, and attr |
| 316 | * The real directory entry is returned by 'dentptr' |
| 317 | */ |
| 318 | static void |
| 319 | fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name) |
| 320 | { |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 321 | dir_slot *slotptr = (dir_slot *)get_contents_vfatname_block; |
Anatolij Gustschin | f4f9d5d | 2011-12-15 03:12:14 +0000 | [diff] [blame] | 322 | __u8 counter = 0, checksum; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 323 | int idx = 0, ret; |
| 324 | char s_name[16]; |
| 325 | |
| 326 | /* Get short file name and checksum value */ |
| 327 | strncpy(s_name, (*dentptr)->name, 16); |
Marek Vasut | 47a470f | 2012-10-09 07:20:22 +0000 | [diff] [blame] | 328 | checksum = mkcksum((*dentptr)->name, (*dentptr)->ext); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 329 | |
| 330 | do { |
| 331 | memset(slotptr, 0x00, sizeof(dir_slot)); |
| 332 | ret = str2slot(slotptr, l_name, &idx); |
| 333 | slotptr->id = ++counter; |
| 334 | slotptr->attr = ATTR_VFAT; |
| 335 | slotptr->alias_checksum = checksum; |
| 336 | slotptr++; |
| 337 | } while (ret == 0); |
| 338 | |
| 339 | slotptr--; |
| 340 | slotptr->id |= LAST_LONG_ENTRY_MASK; |
| 341 | |
| 342 | while (counter >= 1) { |
| 343 | if (is_next_clust(mydata, *dentptr)) { |
| 344 | /* A new cluster is allocated for directory table */ |
| 345 | flush_dir_table(mydata, dentptr); |
| 346 | } |
| 347 | memcpy(*dentptr, slotptr, sizeof(dir_slot)); |
| 348 | (*dentptr)++; |
| 349 | slotptr--; |
| 350 | counter--; |
| 351 | } |
| 352 | |
| 353 | if (is_next_clust(mydata, *dentptr)) { |
| 354 | /* A new cluster is allocated for directory table */ |
| 355 | flush_dir_table(mydata, dentptr); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | static __u32 dir_curclust; |
| 360 | |
| 361 | /* |
| 362 | * Extract the full long filename starting at 'retdent' (which is really |
| 363 | * a slot) into 'l_name'. If successful also copy the real directory entry |
| 364 | * into 'retdent' |
| 365 | * If additional adjacent cluster for directory entries is read into memory, |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 366 | * then 'get_contents_vfatname_block' is copied into 'get_dentfromdir_block' and |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 367 | * the location of the real directory entry is returned by 'retdent' |
| 368 | * Return 0 on success, -1 otherwise. |
| 369 | */ |
| 370 | static int |
| 371 | get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster, |
| 372 | dir_entry **retdent, char *l_name) |
| 373 | { |
| 374 | dir_entry *realdent; |
| 375 | dir_slot *slotptr = (dir_slot *)(*retdent); |
| 376 | dir_slot *slotptr2 = NULL; |
| 377 | __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ? |
| 378 | PREFETCH_BLOCKS : |
| 379 | mydata->clust_size); |
| 380 | __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; |
| 381 | int idx = 0, cur_position = 0; |
| 382 | |
| 383 | if (counter > VFAT_MAXSEQ) { |
| 384 | debug("Error: VFAT name is too long\n"); |
| 385 | return -1; |
| 386 | } |
| 387 | |
| 388 | while ((__u8 *)slotptr < buflimit) { |
| 389 | if (counter == 0) |
| 390 | break; |
| 391 | if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) |
| 392 | return -1; |
| 393 | slotptr++; |
| 394 | counter--; |
| 395 | } |
| 396 | |
| 397 | if ((__u8 *)slotptr >= buflimit) { |
| 398 | if (curclust == 0) |
| 399 | return -1; |
| 400 | curclust = get_fatent_value(mydata, dir_curclust); |
| 401 | if (CHECK_CLUST(curclust, mydata->fatsize)) { |
| 402 | debug("curclust: 0x%x\n", curclust); |
| 403 | printf("Invalid FAT entry\n"); |
| 404 | return -1; |
| 405 | } |
| 406 | |
| 407 | dir_curclust = curclust; |
| 408 | |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 409 | if (get_cluster(mydata, curclust, get_contents_vfatname_block, |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 410 | mydata->clust_size * mydata->sect_size) != 0) { |
| 411 | debug("Error: reading directory block\n"); |
| 412 | return -1; |
| 413 | } |
| 414 | |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 415 | slotptr2 = (dir_slot *)get_contents_vfatname_block; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 416 | while (counter > 0) { |
| 417 | if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK) |
| 418 | & 0xff) != counter) |
| 419 | return -1; |
| 420 | slotptr2++; |
| 421 | counter--; |
| 422 | } |
| 423 | |
| 424 | /* Save the real directory entry */ |
| 425 | realdent = (dir_entry *)slotptr2; |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 426 | while ((__u8 *)slotptr2 > get_contents_vfatname_block) { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 427 | slotptr2--; |
| 428 | slot2str(slotptr2, l_name, &idx); |
| 429 | } |
| 430 | } else { |
| 431 | /* Save the real directory entry */ |
| 432 | realdent = (dir_entry *)slotptr; |
| 433 | } |
| 434 | |
| 435 | do { |
| 436 | slotptr--; |
| 437 | if (slot2str(slotptr, l_name, &idx)) |
| 438 | break; |
| 439 | } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); |
| 440 | |
| 441 | l_name[idx] = '\0'; |
| 442 | if (*l_name == DELETED_FLAG) |
| 443 | *l_name = '\0'; |
| 444 | else if (*l_name == aRING) |
| 445 | *l_name = DELETED_FLAG; |
| 446 | downcase(l_name); |
| 447 | |
| 448 | /* Return the real directory entry */ |
| 449 | *retdent = realdent; |
| 450 | |
| 451 | if (slotptr2) { |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 452 | memcpy(get_dentfromdir_block, get_contents_vfatname_block, |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 453 | mydata->clust_size * mydata->sect_size); |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 454 | cur_position = (__u8 *)realdent - get_contents_vfatname_block; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 455 | *retdent = (dir_entry *) &get_dentfromdir_block[cur_position]; |
| 456 | } |
| 457 | |
| 458 | return 0; |
| 459 | } |
| 460 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 461 | /* |
| 462 | * Set the entry at index 'entry' in a FAT (16/32) table. |
| 463 | */ |
| 464 | static int set_fatent_value(fsdata *mydata, __u32 entry, __u32 entry_value) |
| 465 | { |
| 466 | __u32 bufnum, offset; |
| 467 | |
| 468 | switch (mydata->fatsize) { |
| 469 | case 32: |
| 470 | bufnum = entry / FAT32BUFSIZE; |
| 471 | offset = entry - bufnum * FAT32BUFSIZE; |
| 472 | break; |
| 473 | case 16: |
| 474 | bufnum = entry / FAT16BUFSIZE; |
| 475 | offset = entry - bufnum * FAT16BUFSIZE; |
| 476 | break; |
| 477 | default: |
| 478 | /* Unsupported FAT size */ |
| 479 | return -1; |
| 480 | } |
| 481 | |
| 482 | /* Read a new block of FAT entries into the cache. */ |
| 483 | if (bufnum != mydata->fatbufnum) { |
| 484 | int getsize = FATBUFBLOCKS; |
| 485 | __u8 *bufptr = mydata->fatbuf; |
| 486 | __u32 fatlength = mydata->fatlength; |
| 487 | __u32 startblock = bufnum * FATBUFBLOCKS; |
| 488 | |
| 489 | fatlength *= mydata->sect_size; |
| 490 | startblock += mydata->fat_sect; |
| 491 | |
| 492 | if (getsize > fatlength) |
| 493 | getsize = fatlength; |
| 494 | |
| 495 | if (mydata->fatbufnum != -1) { |
| 496 | if (flush_fat_buffer(mydata) < 0) |
| 497 | return -1; |
| 498 | } |
| 499 | |
| 500 | if (disk_read(startblock, getsize, bufptr) < 0) { |
| 501 | debug("Error reading FAT blocks\n"); |
| 502 | return -1; |
| 503 | } |
| 504 | mydata->fatbufnum = bufnum; |
| 505 | } |
| 506 | |
| 507 | /* Set the actual entry */ |
| 508 | switch (mydata->fatsize) { |
| 509 | case 32: |
| 510 | ((__u32 *) mydata->fatbuf)[offset] = cpu_to_le32(entry_value); |
| 511 | break; |
| 512 | case 16: |
| 513 | ((__u16 *) mydata->fatbuf)[offset] = cpu_to_le16(entry_value); |
| 514 | break; |
| 515 | default: |
| 516 | return -1; |
| 517 | } |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Determine the entry value at index 'entry' in a FAT (16/32) table |
| 524 | */ |
| 525 | static __u32 determine_fatent(fsdata *mydata, __u32 entry) |
| 526 | { |
| 527 | __u32 next_fat, next_entry = entry + 1; |
| 528 | |
| 529 | while (1) { |
| 530 | next_fat = get_fatent_value(mydata, next_entry); |
| 531 | if (next_fat == 0) { |
| 532 | set_fatent_value(mydata, entry, next_entry); |
| 533 | break; |
| 534 | } |
| 535 | next_entry++; |
| 536 | } |
| 537 | debug("FAT%d: entry: %08x, entry_value: %04x\n", |
| 538 | mydata->fatsize, entry, next_entry); |
| 539 | |
| 540 | return next_entry; |
| 541 | } |
| 542 | |
| 543 | /* |
| 544 | * Write at most 'size' bytes from 'buffer' into the specified cluster. |
| 545 | * Return 0 on success, -1 otherwise. |
| 546 | */ |
| 547 | static int |
| 548 | set_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, |
| 549 | unsigned long size) |
| 550 | { |
| 551 | int idx = 0; |
| 552 | __u32 startsect; |
| 553 | |
| 554 | if (clustnum > 0) |
| 555 | startsect = mydata->data_begin + |
| 556 | clustnum * mydata->clust_size; |
| 557 | else |
| 558 | startsect = mydata->rootdir_sect; |
| 559 | |
| 560 | debug("clustnum: %d, startsect: %d\n", clustnum, startsect); |
| 561 | |
Wu, Josh | b0e38dd | 2013-07-24 17:55:30 +0800 | [diff] [blame] | 562 | if ((size / mydata->sect_size) > 0) { |
| 563 | if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) { |
| 564 | debug("Error writing data\n"); |
| 565 | return -1; |
| 566 | } |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | if (size % mydata->sect_size) { |
| 570 | __u8 tmpbuf[mydata->sect_size]; |
| 571 | |
| 572 | idx = size / mydata->sect_size; |
| 573 | buffer += idx * mydata->sect_size; |
| 574 | memcpy(tmpbuf, buffer, size % mydata->sect_size); |
| 575 | |
| 576 | if (disk_write(startsect + idx, 1, tmpbuf) < 0) { |
| 577 | debug("Error writing data\n"); |
| 578 | return -1; |
| 579 | } |
| 580 | |
| 581 | return 0; |
| 582 | } |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * Find the first empty cluster |
| 589 | */ |
| 590 | static int find_empty_cluster(fsdata *mydata) |
| 591 | { |
| 592 | __u32 fat_val, entry = 3; |
| 593 | |
| 594 | while (1) { |
| 595 | fat_val = get_fatent_value(mydata, entry); |
| 596 | if (fat_val == 0) |
| 597 | break; |
| 598 | entry++; |
| 599 | } |
| 600 | |
| 601 | return entry; |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Write directory entries in 'get_dentfromdir_block' to block device |
| 606 | */ |
| 607 | static void flush_dir_table(fsdata *mydata, dir_entry **dentptr) |
| 608 | { |
| 609 | int dir_newclust = 0; |
| 610 | |
| 611 | if (set_cluster(mydata, dir_curclust, |
| 612 | get_dentfromdir_block, |
| 613 | mydata->clust_size * mydata->sect_size) != 0) { |
| 614 | printf("error: wrinting directory entry\n"); |
| 615 | return; |
| 616 | } |
| 617 | dir_newclust = find_empty_cluster(mydata); |
| 618 | set_fatent_value(mydata, dir_curclust, dir_newclust); |
| 619 | if (mydata->fatsize == 32) |
| 620 | set_fatent_value(mydata, dir_newclust, 0xffffff8); |
| 621 | else if (mydata->fatsize == 16) |
| 622 | set_fatent_value(mydata, dir_newclust, 0xfff8); |
| 623 | |
| 624 | dir_curclust = dir_newclust; |
| 625 | |
| 626 | if (flush_fat_buffer(mydata) < 0) |
| 627 | return; |
| 628 | |
| 629 | memset(get_dentfromdir_block, 0x00, |
| 630 | mydata->clust_size * mydata->sect_size); |
| 631 | |
| 632 | *dentptr = (dir_entry *) get_dentfromdir_block; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Set empty cluster from 'entry' to the end of a file |
| 637 | */ |
| 638 | static int clear_fatent(fsdata *mydata, __u32 entry) |
| 639 | { |
| 640 | __u32 fat_val; |
| 641 | |
| 642 | while (1) { |
| 643 | fat_val = get_fatent_value(mydata, entry); |
| 644 | if (fat_val != 0) |
| 645 | set_fatent_value(mydata, entry, 0); |
| 646 | else |
| 647 | break; |
| 648 | |
| 649 | if (fat_val == 0xfffffff || fat_val == 0xffff) |
| 650 | break; |
| 651 | |
| 652 | entry = fat_val; |
| 653 | } |
| 654 | |
| 655 | /* Flush fat buffer */ |
| 656 | if (flush_fat_buffer(mydata) < 0) |
| 657 | return -1; |
| 658 | |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * Write at most 'maxsize' bytes from 'buffer' into |
| 664 | * the file associated with 'dentptr' |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 665 | * Update the number of bytes written in *gotsize and return 0 |
| 666 | * or return -1 on fatal errors. |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 667 | */ |
| 668 | static int |
| 669 | set_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 670 | loff_t maxsize, loff_t *gotsize) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 671 | { |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 672 | loff_t filesize = FAT2CPU32(dentptr->size); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 673 | unsigned int bytesperclust = mydata->clust_size * mydata->sect_size; |
| 674 | __u32 curclust = START(dentptr); |
| 675 | __u32 endclust = 0, newclust = 0; |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 676 | loff_t actsize; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 677 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 678 | *gotsize = 0; |
| 679 | debug("Filesize: %llu bytes\n", filesize); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 680 | |
| 681 | if (maxsize > 0 && filesize > maxsize) |
| 682 | filesize = maxsize; |
| 683 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 684 | debug("%llu bytes\n", filesize); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 685 | |
| 686 | actsize = bytesperclust; |
| 687 | endclust = curclust; |
| 688 | do { |
| 689 | /* search for consecutive clusters */ |
| 690 | while (actsize < filesize) { |
| 691 | newclust = determine_fatent(mydata, endclust); |
| 692 | |
| 693 | if ((newclust - 1) != endclust) |
| 694 | goto getit; |
| 695 | |
| 696 | if (CHECK_CLUST(newclust, mydata->fatsize)) { |
| 697 | debug("curclust: 0x%x\n", newclust); |
| 698 | debug("Invalid FAT entry\n"); |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 699 | return 0; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 700 | } |
| 701 | endclust = newclust; |
| 702 | actsize += bytesperclust; |
| 703 | } |
| 704 | /* actsize >= file size */ |
| 705 | actsize -= bytesperclust; |
| 706 | /* set remaining clusters */ |
| 707 | if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) { |
| 708 | debug("error: writing cluster\n"); |
| 709 | return -1; |
| 710 | } |
| 711 | |
| 712 | /* set remaining bytes */ |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 713 | *gotsize += actsize; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 714 | filesize -= actsize; |
| 715 | buffer += actsize; |
| 716 | actsize = filesize; |
| 717 | |
| 718 | if (set_cluster(mydata, endclust, buffer, (int)actsize) != 0) { |
| 719 | debug("error: writing cluster\n"); |
| 720 | return -1; |
| 721 | } |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 722 | *gotsize += actsize; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 723 | |
| 724 | /* Mark end of file in FAT */ |
| 725 | if (mydata->fatsize == 16) |
| 726 | newclust = 0xffff; |
| 727 | else if (mydata->fatsize == 32) |
| 728 | newclust = 0xfffffff; |
| 729 | set_fatent_value(mydata, endclust, newclust); |
| 730 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 731 | return 0; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 732 | getit: |
| 733 | if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) { |
| 734 | debug("error: writing cluster\n"); |
| 735 | return -1; |
| 736 | } |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 737 | *gotsize += actsize; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 738 | filesize -= actsize; |
| 739 | buffer += actsize; |
| 740 | |
| 741 | if (CHECK_CLUST(curclust, mydata->fatsize)) { |
| 742 | debug("curclust: 0x%x\n", curclust); |
| 743 | debug("Invalid FAT entry\n"); |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 744 | return 0; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 745 | } |
| 746 | actsize = bytesperclust; |
| 747 | curclust = endclust = newclust; |
| 748 | } while (1); |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * Fill dir_entry |
| 753 | */ |
| 754 | static void fill_dentry(fsdata *mydata, dir_entry *dentptr, |
| 755 | const char *filename, __u32 start_cluster, __u32 size, __u8 attr) |
| 756 | { |
| 757 | if (mydata->fatsize == 32) |
| 758 | dentptr->starthi = |
| 759 | cpu_to_le16((start_cluster & 0xffff0000) >> 16); |
| 760 | dentptr->start = cpu_to_le16(start_cluster & 0xffff); |
| 761 | dentptr->size = cpu_to_le32(size); |
| 762 | |
| 763 | dentptr->attr = attr; |
| 764 | |
| 765 | set_name(dentptr, filename); |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * Check whether adding a file makes the file system to |
| 770 | * exceed the size of the block device |
| 771 | * Return -1 when overflow occurs, otherwise return 0 |
| 772 | */ |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 773 | static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 774 | { |
Tom Rini | a17b7bc | 2014-11-24 11:50:46 -0500 | [diff] [blame] | 775 | __u32 startsect, sect_num, offset; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 776 | |
| 777 | if (clustnum > 0) { |
| 778 | startsect = mydata->data_begin + |
| 779 | clustnum * mydata->clust_size; |
| 780 | } else { |
| 781 | startsect = mydata->rootdir_sect; |
| 782 | } |
| 783 | |
Tom Rini | a17b7bc | 2014-11-24 11:50:46 -0500 | [diff] [blame] | 784 | sect_num = div_u64_rem(size, mydata->sect_size, &offset); |
| 785 | |
| 786 | if (offset != 0) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 787 | sect_num++; |
| 788 | |
Donggeun Kim | cb5f3bc | 2012-03-22 04:38:55 +0000 | [diff] [blame] | 789 | if (startsect + sect_num > cur_part_info.start + total_sector) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 790 | return -1; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 791 | return 0; |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * Check if adding several entries exceed one cluster boundary |
| 796 | */ |
| 797 | static int is_next_clust(fsdata *mydata, dir_entry *dentptr) |
| 798 | { |
| 799 | int cur_position; |
| 800 | |
| 801 | cur_position = (__u8 *)dentptr - get_dentfromdir_block; |
| 802 | |
| 803 | if (cur_position >= mydata->clust_size * mydata->sect_size) |
| 804 | return 1; |
| 805 | else |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | static dir_entry *empty_dentptr; |
| 810 | /* |
| 811 | * Find a directory entry based on filename or start cluster number |
| 812 | * If the directory entry is not found, |
| 813 | * the new position for writing a directory entry will be returned |
| 814 | */ |
| 815 | static dir_entry *find_directory_entry(fsdata *mydata, int startsect, |
| 816 | char *filename, dir_entry *retdent, __u32 start) |
| 817 | { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 818 | __u32 curclust = (startsect - mydata->data_begin) / mydata->clust_size; |
| 819 | |
| 820 | debug("get_dentfromdir: %s\n", filename); |
| 821 | |
| 822 | while (1) { |
| 823 | dir_entry *dentptr; |
| 824 | |
| 825 | int i; |
| 826 | |
| 827 | if (get_cluster(mydata, curclust, get_dentfromdir_block, |
| 828 | mydata->clust_size * mydata->sect_size) != 0) { |
| 829 | printf("Error: reading directory block\n"); |
| 830 | return NULL; |
| 831 | } |
| 832 | |
| 833 | dentptr = (dir_entry *)get_dentfromdir_block; |
| 834 | |
| 835 | dir_curclust = curclust; |
| 836 | |
| 837 | for (i = 0; i < DIRENTSPERCLUST; i++) { |
| 838 | char s_name[14], l_name[VFAT_MAXLEN_BYTES]; |
| 839 | |
| 840 | l_name[0] = '\0'; |
| 841 | if (dentptr->name[0] == DELETED_FLAG) { |
| 842 | dentptr++; |
| 843 | if (is_next_clust(mydata, dentptr)) |
| 844 | break; |
| 845 | continue; |
| 846 | } |
| 847 | if ((dentptr->attr & ATTR_VOLUME)) { |
Richard Genoud | a43f41f | 2012-12-13 03:30:10 +0000 | [diff] [blame] | 848 | if (vfat_enabled && |
| 849 | (dentptr->attr & ATTR_VFAT) && |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 850 | (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 851 | get_long_file_name(mydata, curclust, |
| 852 | get_dentfromdir_block, |
| 853 | &dentptr, l_name); |
| 854 | debug("vfatname: |%s|\n", l_name); |
Richard Genoud | a43f41f | 2012-12-13 03:30:10 +0000 | [diff] [blame] | 855 | } else { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 856 | /* Volume label or VFAT entry */ |
| 857 | dentptr++; |
| 858 | if (is_next_clust(mydata, dentptr)) |
| 859 | break; |
| 860 | continue; |
| 861 | } |
| 862 | } |
| 863 | if (dentptr->name[0] == 0) { |
| 864 | debug("Dentname == NULL - %d\n", i); |
| 865 | empty_dentptr = dentptr; |
| 866 | return NULL; |
| 867 | } |
| 868 | |
| 869 | get_name(dentptr, s_name); |
| 870 | |
| 871 | if (strcmp(filename, s_name) |
| 872 | && strcmp(filename, l_name)) { |
| 873 | debug("Mismatch: |%s|%s|\n", |
| 874 | s_name, l_name); |
| 875 | dentptr++; |
| 876 | if (is_next_clust(mydata, dentptr)) |
| 877 | break; |
| 878 | continue; |
| 879 | } |
| 880 | |
| 881 | memcpy(retdent, dentptr, sizeof(dir_entry)); |
| 882 | |
| 883 | debug("DentName: %s", s_name); |
| 884 | debug(", start: 0x%x", START(dentptr)); |
| 885 | debug(", size: 0x%x %s\n", |
| 886 | FAT2CPU32(dentptr->size), |
| 887 | (dentptr->attr & ATTR_DIR) ? |
| 888 | "(DIR)" : ""); |
| 889 | |
| 890 | return dentptr; |
| 891 | } |
| 892 | |
Wu, Josh | 675b23c | 2014-05-08 16:14:07 +0800 | [diff] [blame] | 893 | /* |
| 894 | * In FAT16/12, the root dir is locate before data area, shows |
| 895 | * in following: |
| 896 | * ------------------------------------------------------------- |
| 897 | * | Boot | FAT1 & 2 | Root dir | Data (start from cluster #2) | |
| 898 | * ------------------------------------------------------------- |
| 899 | * |
| 900 | * As a result if curclust is in Root dir, it is a negative |
| 901 | * number or 0, 1. |
| 902 | * |
| 903 | */ |
| 904 | if (mydata->fatsize != 32 && (int)curclust <= 1) { |
| 905 | /* Current clust is in root dir, set to next clust */ |
| 906 | curclust++; |
| 907 | if ((int)curclust <= 1) |
| 908 | continue; /* continue to find */ |
| 909 | |
| 910 | /* Reach the end of root dir */ |
| 911 | empty_dentptr = dentptr; |
| 912 | return NULL; |
| 913 | } |
| 914 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 915 | curclust = get_fatent_value(mydata, dir_curclust); |
Wu, Josh | 10c8f7a | 2014-05-08 16:14:06 +0800 | [diff] [blame] | 916 | if (IS_LAST_CLUST(curclust, mydata->fatsize)) { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 917 | empty_dentptr = dentptr; |
| 918 | return NULL; |
| 919 | } |
| 920 | if (CHECK_CLUST(curclust, mydata->fatsize)) { |
| 921 | debug("curclust: 0x%x\n", curclust); |
| 922 | debug("Invalid FAT entry\n"); |
| 923 | return NULL; |
| 924 | } |
| 925 | } |
| 926 | |
| 927 | return NULL; |
| 928 | } |
| 929 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 930 | static int do_fat_write(const char *filename, void *buffer, loff_t size, |
| 931 | loff_t *actwrite) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 932 | { |
| 933 | dir_entry *dentptr, *retdent; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 934 | __u32 startsect; |
| 935 | __u32 start_cluster; |
| 936 | boot_sector bs; |
| 937 | volume_info volinfo; |
| 938 | fsdata datablock; |
| 939 | fsdata *mydata = &datablock; |
| 940 | int cursect; |
Anatolij Gustschin | 074438c | 2012-03-24 23:40:56 +0100 | [diff] [blame] | 941 | int ret = -1, name_len; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 942 | char l_filename[VFAT_MAXLEN_BYTES]; |
| 943 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 944 | *actwrite = size; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 945 | dir_curclust = 0; |
| 946 | |
| 947 | if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { |
| 948 | debug("error: reading boot sector\n"); |
| 949 | return -1; |
| 950 | } |
| 951 | |
| 952 | total_sector = bs.total_sect; |
| 953 | if (total_sector == 0) |
Steve Rae | d30cbae | 2014-05-26 11:52:23 -0700 | [diff] [blame] | 954 | total_sector = (int)cur_part_info.size; /* cast of lbaint_t */ |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 955 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 956 | if (mydata->fatsize == 32) |
| 957 | mydata->fatlength = bs.fat32_length; |
| 958 | else |
| 959 | mydata->fatlength = bs.fat_length; |
| 960 | |
| 961 | mydata->fat_sect = bs.reserved; |
| 962 | |
| 963 | cursect = mydata->rootdir_sect |
| 964 | = mydata->fat_sect + mydata->fatlength * bs.fats; |
Donggeun Kim | af57ce2 | 2011-12-20 18:34:27 +0000 | [diff] [blame] | 965 | num_of_fats = bs.fats; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 966 | |
| 967 | mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0]; |
| 968 | mydata->clust_size = bs.cluster_size; |
| 969 | |
| 970 | if (mydata->fatsize == 32) { |
| 971 | mydata->data_begin = mydata->rootdir_sect - |
| 972 | (mydata->clust_size * 2); |
| 973 | } else { |
| 974 | int rootdir_size; |
| 975 | |
| 976 | rootdir_size = ((bs.dir_entries[1] * (int)256 + |
| 977 | bs.dir_entries[0]) * |
| 978 | sizeof(dir_entry)) / |
| 979 | mydata->sect_size; |
| 980 | mydata->data_begin = mydata->rootdir_sect + |
| 981 | rootdir_size - |
| 982 | (mydata->clust_size * 2); |
| 983 | } |
| 984 | |
| 985 | mydata->fatbufnum = -1; |
Nobuhiro Iwamatsu | ec6e525 | 2014-04-08 11:12:46 +0900 | [diff] [blame] | 986 | mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 987 | if (mydata->fatbuf == NULL) { |
| 988 | debug("Error: allocating memory\n"); |
| 989 | return -1; |
| 990 | } |
| 991 | |
| 992 | if (disk_read(cursect, |
| 993 | (mydata->fatsize == 32) ? |
| 994 | (mydata->clust_size) : |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 995 | PREFETCH_BLOCKS, do_fat_read_at_block) < 0) { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 996 | debug("Error: reading rootdir block\n"); |
| 997 | goto exit; |
| 998 | } |
Benoît Thébaudeau | 5295aa8 | 2012-09-18 08:14:56 +0000 | [diff] [blame] | 999 | dentptr = (dir_entry *) do_fat_read_at_block; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1000 | |
| 1001 | name_len = strlen(filename); |
Anatolij Gustschin | f4f9d5d | 2011-12-15 03:12:14 +0000 | [diff] [blame] | 1002 | if (name_len >= VFAT_MAXLEN_BYTES) |
| 1003 | name_len = VFAT_MAXLEN_BYTES - 1; |
| 1004 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1005 | memcpy(l_filename, filename, name_len); |
Anatolij Gustschin | f4f9d5d | 2011-12-15 03:12:14 +0000 | [diff] [blame] | 1006 | l_filename[name_len] = 0; /* terminate the string */ |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1007 | downcase(l_filename); |
| 1008 | |
| 1009 | startsect = mydata->rootdir_sect; |
| 1010 | retdent = find_directory_entry(mydata, startsect, |
| 1011 | l_filename, dentptr, 0); |
| 1012 | if (retdent) { |
| 1013 | /* Update file size and start_cluster in a directory entry */ |
| 1014 | retdent->size = cpu_to_le32(size); |
| 1015 | start_cluster = FAT2CPU16(retdent->start); |
| 1016 | if (mydata->fatsize == 32) |
| 1017 | start_cluster |= |
| 1018 | (FAT2CPU16(retdent->starthi) << 16); |
| 1019 | |
| 1020 | ret = check_overflow(mydata, start_cluster, size); |
| 1021 | if (ret) { |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1022 | printf("Error: %llu overflow\n", size); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1023 | goto exit; |
| 1024 | } |
| 1025 | |
| 1026 | ret = clear_fatent(mydata, start_cluster); |
| 1027 | if (ret) { |
| 1028 | printf("Error: clearing FAT entries\n"); |
| 1029 | goto exit; |
| 1030 | } |
| 1031 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1032 | ret = set_contents(mydata, retdent, buffer, size, actwrite); |
Anatolij Gustschin | f4f9d5d | 2011-12-15 03:12:14 +0000 | [diff] [blame] | 1033 | if (ret < 0) { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1034 | printf("Error: writing contents\n"); |
| 1035 | goto exit; |
| 1036 | } |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1037 | debug("attempt to write 0x%llx bytes\n", *actwrite); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1038 | |
| 1039 | /* Flush fat buffer */ |
| 1040 | ret = flush_fat_buffer(mydata); |
| 1041 | if (ret) { |
| 1042 | printf("Error: flush fat buffer\n"); |
| 1043 | goto exit; |
| 1044 | } |
| 1045 | |
| 1046 | /* Write directory table to device */ |
| 1047 | ret = set_cluster(mydata, dir_curclust, |
| 1048 | get_dentfromdir_block, |
| 1049 | mydata->clust_size * mydata->sect_size); |
| 1050 | if (ret) { |
Anatolij Gustschin | f4f9d5d | 2011-12-15 03:12:14 +0000 | [diff] [blame] | 1051 | printf("Error: writing directory entry\n"); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1052 | goto exit; |
| 1053 | } |
| 1054 | } else { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1055 | /* Set short name to set alias checksum field in dir_slot */ |
| 1056 | set_name(empty_dentptr, filename); |
| 1057 | fill_dir_slot(mydata, &empty_dentptr, filename); |
| 1058 | |
| 1059 | ret = start_cluster = find_empty_cluster(mydata); |
| 1060 | if (ret < 0) { |
| 1061 | printf("Error: finding empty cluster\n"); |
| 1062 | goto exit; |
| 1063 | } |
| 1064 | |
| 1065 | ret = check_overflow(mydata, start_cluster, size); |
| 1066 | if (ret) { |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1067 | printf("Error: %llu overflow\n", size); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1068 | goto exit; |
| 1069 | } |
| 1070 | |
| 1071 | /* Set attribute as archieve for regular file */ |
| 1072 | fill_dentry(mydata, empty_dentptr, filename, |
| 1073 | start_cluster, size, 0x20); |
| 1074 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1075 | ret = set_contents(mydata, empty_dentptr, buffer, size, |
| 1076 | actwrite); |
Anatolij Gustschin | f4f9d5d | 2011-12-15 03:12:14 +0000 | [diff] [blame] | 1077 | if (ret < 0) { |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1078 | printf("Error: writing contents\n"); |
| 1079 | goto exit; |
| 1080 | } |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1081 | debug("attempt to write 0x%llx bytes\n", *actwrite); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1082 | |
| 1083 | /* Flush fat buffer */ |
| 1084 | ret = flush_fat_buffer(mydata); |
| 1085 | if (ret) { |
| 1086 | printf("Error: flush fat buffer\n"); |
| 1087 | goto exit; |
| 1088 | } |
| 1089 | |
| 1090 | /* Write directory table to device */ |
| 1091 | ret = set_cluster(mydata, dir_curclust, |
| 1092 | get_dentfromdir_block, |
| 1093 | mydata->clust_size * mydata->sect_size); |
| 1094 | if (ret) { |
| 1095 | printf("Error: writing directory entry\n"); |
| 1096 | goto exit; |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | exit: |
| 1101 | free(mydata->fatbuf); |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1102 | return ret; |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1103 | } |
| 1104 | |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1105 | int file_fat_write(const char *filename, void *buffer, loff_t offset, |
| 1106 | loff_t maxsize, loff_t *actwrite) |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1107 | { |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1108 | if (offset != 0) { |
| 1109 | printf("Error: non zero offset is currently not suported.\n"); |
| 1110 | return -1; |
| 1111 | } |
| 1112 | |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1113 | printf("writing %s\n", filename); |
Suriyan Ramasami | 441c223 | 2014-11-17 14:39:35 -0800 | [diff] [blame] | 1114 | return do_fat_write(filename, buffer, maxsize, actwrite); |
Donggeun Kim | 8f81400 | 2011-10-24 21:15:28 +0000 | [diff] [blame] | 1115 | } |