source: mainline/uspace/app/mkexfat/mkexfat.c@ 3e6a98c5

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 3e6a98c5 was 3e6a98c5, checked in by Jiri Svoboda <jiri@…>, 13 years ago

Standards-compliant boolean type.
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File size: 23.7 KB
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1/*
2 * Copyright (c) 2012 Maurizio Lombardi
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup fs
30 * @{
31 */
32
33/**
34 * @file mkexfat.c
35 * @brief Tool for creating new exFAT file systems.
36 *
37 */
38
39#include <stdio.h>
40#include <block.h>
41#include <assert.h>
42#include <errno.h>
43#include <malloc.h>
44#include <byteorder.h>
45#include <align.h>
46#include <sys/types.h>
47#include <sys/typefmt.h>
48#include <stdbool.h>
49#include <str.h>
50#include <getopt.h>
51#include <macros.h>
52#include "exfat.h"
53#include "upcase.h"
54
55#define NAME "mkexfat"
56
57/** First sector of the FAT */
58#define FAT_SECTOR_START 128
59
60/** First sector of the Main Extended Boot Region */
61#define EBS_SECTOR_START 1
62
63/** First sector of the Main Extended Boot Region Backup */
64#define EBS_BACKUP_SECTOR_START 13
65
66/** First sector of the Main Boot Sector */
67#define MBS_SECTOR 0
68
69/** First sector of the Main Boot Sector Backup */
70#define MBS_BACKUP_SECTOR 12
71
72/** VBR Checksum sector */
73#define VBR_CHECKSUM_SECTOR 11
74
75/** VBR Backup Checksum sector */
76#define VBR_BACKUP_CHECKSUM_SECTOR 23
77
78/** Size of the Main Extended Boot Region */
79#define EBS_SIZE 8
80
81/** Divide and round up. */
82#define div_round_up(a, b) (((a) + (b) - 1) / (b))
83
84/** The default size of each cluster is 4096 byte */
85#define DEFAULT_CLUSTER_SIZE 4096
86
87/** Index of the first free cluster on the device */
88#define FIRST_FREE_CLUSTER 2
89
90
91typedef struct exfat_cfg {
92 aoff64_t volume_start;
93 aoff64_t volume_count;
94 unsigned long fat_sector_count;
95 unsigned long data_start_sector;
96 unsigned long rootdir_cluster;
97 unsigned long upcase_table_cluster;
98 unsigned long bitmap_cluster;
99 unsigned long total_clusters;
100 unsigned long allocated_clusters;
101 size_t bitmap_size;
102 size_t sector_size;
103 size_t cluster_size;
104} exfat_cfg_t;
105
106
107static unsigned log2(unsigned n);
108
109static uint32_t
110vbr_checksum_start(void const *octets, size_t nbytes);
111
112static void
113vbr_checksum_update(void const *octets, size_t nbytes, uint32_t *checksum);
114
115static int
116ebs_write(service_id_t service_id, exfat_cfg_t *cfg,
117 int base, uint32_t *chksum);
118
119static int
120bitmap_write(service_id_t service_id, exfat_cfg_t *cfg);
121
122static uint32_t
123upcase_table_checksum(void const *data, size_t nbytes);
124
125static struct option const long_options[] = {
126 {"help", no_argument, 0, 'h'},
127 {"cluster-size", required_argument, 0, 'c'},
128 {"fs-size", required_argument, 0, 's'},
129};
130
131static void usage(void)
132{
133 printf("Usage: mkexfat [options] <device>\n"
134 "-c, --cluster-size ## Specify the cluster size (Kb)\n"
135 "-s, --fs-size ## Specify the filesystem size (sectors)\n");
136}
137
138/** Initialize the exFAT params structure.
139 *
140 * @param cfg Pointer to the exFAT params structure to initialize.
141 */
142static void
143cfg_params_initialize(exfat_cfg_t *cfg)
144{
145 unsigned long fat_bytes;
146 unsigned long fat_cls;
147 aoff64_t const volume_bytes = (cfg->volume_count - FAT_SECTOR_START) *
148 cfg->sector_size;
149
150 if (cfg->cluster_size != 0) {
151 /* The user already choose the cluster size he wants */
152 cfg->total_clusters = volume_bytes / cfg->cluster_size;
153 goto skip_cluster_size_set;
154 }
155
156 cfg->total_clusters = volume_bytes / DEFAULT_CLUSTER_SIZE;
157 cfg->cluster_size = DEFAULT_CLUSTER_SIZE;
158
159 /* Compute the required cluster size to index
160 * the entire storage device and to keep the FAT
161 * size less or equal to 64 Mb.
162 */
163 while (cfg->total_clusters > 16000000ULL &&
164 (cfg->cluster_size < 32 * 1024 * 1024)) {
165
166 cfg->cluster_size <<= 1;
167 cfg->total_clusters = volume_bytes / cfg->cluster_size;
168 }
169
170skip_cluster_size_set:
171
172 /* Compute the FAT size in sectors */
173 fat_bytes = (cfg->total_clusters + 3) * sizeof(uint32_t);
174 cfg->fat_sector_count = div_round_up(fat_bytes, cfg->sector_size);
175
176 /* Compute the number of the first data sector */
177 cfg->data_start_sector = ROUND_UP(FAT_SECTOR_START +
178 cfg->fat_sector_count, cfg->cluster_size / cfg->sector_size);
179
180 /* Subtract the FAT space from the total
181 * number of available clusters.
182 */
183 fat_cls = div_round_up((cfg->data_start_sector -
184 FAT_SECTOR_START) * cfg->sector_size,
185 cfg->cluster_size);
186 if (fat_cls >= cfg->total_clusters) {
187 /* Insufficient disk space on device */
188 cfg->total_clusters = 0;
189 return;
190 }
191 cfg->total_clusters -= fat_cls;
192
193 /* Compute the bitmap size */
194 cfg->bitmap_size = div_round_up(cfg->total_clusters, 8);
195
196 /* Compute the number of clusters reserved to the bitmap */
197 cfg->allocated_clusters = div_round_up(cfg->bitmap_size,
198 cfg->cluster_size);
199
200 /* This account for the root directory */
201 cfg->allocated_clusters++;
202
203 /* Compute the number of clusters reserved to the upcase table */
204 cfg->allocated_clusters += div_round_up(sizeof(upcase_table),
205 cfg->cluster_size);
206
207 /* Will be set later */
208 cfg->rootdir_cluster = 0;
209
210 /* Bitmap always starts at the first free cluster */
211 cfg->bitmap_cluster = FIRST_FREE_CLUSTER;
212
213 /* The first sector of the partition is zero */
214 cfg->volume_start = 0;
215}
216
217/** Prints the exFAT structure values
218 *
219 * @param cfg Pointer to the exfat_cfg_t structure.
220 */
221static void
222cfg_print_info(exfat_cfg_t *cfg)
223{
224 printf("Sector size: %lu\n",
225 (unsigned long) cfg->sector_size);
226 printf("Cluster size: %lu\n",
227 (unsigned long) cfg->cluster_size);
228 printf("FAT size in sectors: %lu\n", cfg->fat_sector_count);
229 printf("Data start sector: %lu\n", cfg->data_start_sector);
230 printf("Total num of clusters: %lu\n", cfg->total_clusters);
231 printf("Total used clusters: %lu\n", cfg->allocated_clusters);
232 printf("Bitmap size: %lu\n", (unsigned long)
233 div_round_up(cfg->bitmap_size, cfg->cluster_size));
234 printf("Upcase table size: %lu\n", (unsigned long)
235 div_round_up(sizeof(upcase_table), cfg->cluster_size));
236}
237
238/** Initialize the Main Boot Sector fields.
239 *
240 * @param mbs Pointer to the Main Boot Sector structure.
241 * @param cfg Pointer to the exFAT configuration structure.
242 * @return Initial checksum value.
243 */
244static uint32_t
245vbr_initialize(exfat_bs_t *mbs, exfat_cfg_t *cfg)
246{
247 /* Fill the structure with zeroes */
248 memset(mbs, 0, sizeof(exfat_bs_t));
249
250 /* Init Jump Boot section */
251 mbs->jump[0] = 0xEB;
252 mbs->jump[1] = 0x76;
253 mbs->jump[2] = 0x90;
254
255 /* Set the filesystem name */
256 memcpy(mbs->oem_name, "EXFAT ", sizeof(mbs->oem_name));
257
258 mbs->volume_start = host2uint64_t_le(cfg->volume_start);
259 mbs->volume_count = host2uint64_t_le(cfg->volume_count);
260 mbs->fat_sector_start = host2uint32_t_le(FAT_SECTOR_START);
261 mbs->fat_sector_count = host2uint32_t_le(cfg->fat_sector_count);
262 mbs->data_start_sector = host2uint32_t_le(cfg->data_start_sector);
263
264 mbs->data_clusters = host2uint32_t_le(cfg->total_clusters);
265
266 mbs->rootdir_cluster = host2uint32_t_le(cfg->rootdir_cluster);
267 mbs->volume_serial = host2uint32_t_le(0xe1028172);
268 mbs->version.major = 1;
269 mbs->version.minor = 0;
270 mbs->volume_flags = host2uint16_t_le(0);
271 mbs->bytes_per_sector = log2(cfg->sector_size);
272 mbs->sec_per_cluster = log2(cfg->cluster_size / cfg->sector_size);
273
274 /* Maximum cluster size is 32 Mb */
275 assert((mbs->bytes_per_sector + mbs->sec_per_cluster) <= 25);
276
277 mbs->fat_count = 1;
278 mbs->drive_no = 0x80;
279 mbs->allocated_percent = 0;
280 mbs->signature = host2uint16_t_le(0xAA55);
281
282 return vbr_checksum_start(mbs, sizeof(exfat_bs_t));
283}
284
285static int
286bootsec_write(service_id_t service_id, exfat_cfg_t *cfg)
287{
288 exfat_bs_t mbs;
289 uint32_t vbr_checksum;
290 uint32_t *chksum_sector;
291 int rc;
292 unsigned idx;
293
294 chksum_sector = calloc(cfg->sector_size, sizeof(uint8_t));
295 if (!chksum_sector)
296 return ENOMEM;
297
298 vbr_checksum = vbr_initialize(&mbs, cfg);
299
300 /* Write the Main Boot Sector to disk */
301 rc = block_write_direct(service_id, MBS_SECTOR, 1, &mbs);
302 if (rc != EOK)
303 goto exit;
304
305 /* Write the Main extended boot sectors to disk */
306 rc = ebs_write(service_id, cfg, EBS_SECTOR_START, &vbr_checksum);
307 if (rc != EOK)
308 goto exit;
309
310 /* Write the Main Boot Sector backup to disk */
311 rc = block_write_direct(service_id, MBS_BACKUP_SECTOR, 1, &mbs);
312 if (rc != EOK)
313 goto exit;
314
315 /* Initialize the checksum sectors */
316 for (idx = 0; idx < cfg->sector_size / sizeof(uint32_t); ++idx)
317 chksum_sector[idx] = host2uint32_t_le(vbr_checksum);
318
319 /* Write the main checksum sector to disk */
320 rc = block_write_direct(service_id,
321 VBR_CHECKSUM_SECTOR, 1, chksum_sector);
322 if (rc != EOK)
323 goto exit;
324
325 /* Write the backup checksum sector to disk */
326 rc = block_write_direct(service_id,
327 VBR_BACKUP_CHECKSUM_SECTOR, 1, chksum_sector);
328 if (rc != EOK)
329 goto exit;
330
331 /* Write the Main extended boot sectors backup to disk */
332 rc = ebs_write(service_id, cfg,
333 EBS_BACKUP_SECTOR_START, &vbr_checksum);
334
335exit:
336 free(chksum_sector);
337 return rc;
338}
339
340/** Write the Main Extended Boot Sector to disk
341 *
342 * @param service_id The service id.
343 * @param cfg Pointer to the exFAT configuration structure.
344 * @param base Base sector of the EBS.
345 * @return EOK on success or a negative error code.
346 */
347static int
348ebs_write(service_id_t service_id, exfat_cfg_t *cfg, int base,
349 uint32_t *chksum)
350{
351 uint32_t *ebs = calloc(cfg->sector_size, sizeof(uint8_t));
352 int i, rc;
353
354 if (!ebs)
355 return ENOMEM;
356
357 ebs[cfg->sector_size / 4 - 1] = host2uint32_t_le(0xAA550000);
358
359 for (i = 0; i < EBS_SIZE; ++i) {
360 vbr_checksum_update(ebs, cfg->sector_size, chksum);
361
362 rc = block_write_direct(service_id,
363 i + base, 1, ebs);
364
365 if (rc != EOK)
366 goto exit;
367 }
368
369 /* The OEM record is not yet used
370 * by the official exFAT implementation, we'll fill
371 * it with zeroes.
372 */
373
374 memset(ebs, 0, cfg->sector_size);
375 vbr_checksum_update(ebs, cfg->sector_size, chksum);
376
377 rc = block_write_direct(service_id, i++ + base, 1, ebs);
378 if (rc != EOK)
379 goto exit;
380
381 /* The next sector is reserved, fill it with zeroes too */
382 vbr_checksum_update(ebs, cfg->sector_size, chksum);
383
384 rc = block_write_direct(service_id, i + base, 1, ebs);
385 if (rc != EOK)
386 goto exit;
387
388exit:
389 free(ebs);
390 return rc;
391}
392
393/** Initialize the FAT table.
394 *
395 * @param service_id The service id.
396 * @param cfg Pointer to the exfat_cfg structure.
397 * @return EOK on success or a negative error code.
398 */
399static int
400fat_initialize(service_id_t service_id, exfat_cfg_t *cfg)
401{
402 unsigned long i;
403 uint32_t *pfat;
404 int rc;
405
406 pfat = calloc(cfg->sector_size, 1);
407 if (!pfat)
408 return ENOMEM;
409
410 pfat[0] = host2uint32_t_le(0xFFFFFFF8);
411 pfat[1] = host2uint32_t_le(0xFFFFFFFF);
412
413 rc = block_write_direct(service_id, FAT_SECTOR_START, 1, pfat);
414 if (rc != EOK)
415 goto error;
416
417 pfat[0] = pfat[1] = 0;
418
419 for (i = 1; i < cfg->fat_sector_count; ++i) {
420 rc = block_write_direct(service_id,
421 FAT_SECTOR_START + i, 1, pfat);
422 if (rc != EOK)
423 goto error;
424 }
425
426error:
427 free(pfat);
428 return rc;
429}
430
431/** Allocate a given number of clusters and create a cluster chain.
432 *
433 * @param service_id The service id.
434 * @param cfg Pointer to the exfat configuration structure.
435 * @param cur_cls Cluster index from where to start the allocation.
436 * @param ncls Number of clusters to allocate.
437 * @return EOK on success or a negative error code.
438 */
439static int
440fat_allocate_clusters(service_id_t service_id, exfat_cfg_t *cfg,
441 uint32_t cur_cls, unsigned long ncls)
442{
443 int rc;
444 unsigned const fat_entries = cfg->sector_size / sizeof(uint32_t);
445 aoff64_t fat_sec = cur_cls / fat_entries + FAT_SECTOR_START;
446 uint32_t *fat;
447 uint32_t next_cls = cur_cls;
448
449 cur_cls %= fat_entries;
450
451 fat = malloc(cfg->sector_size);
452 if (!fat)
453 return ENOMEM;
454
455loop:
456 rc = block_read_direct(service_id, fat_sec, 1, fat);
457 if (rc != EOK)
458 goto exit;
459
460 assert(fat[cur_cls] == 0);
461 assert(ncls > 0);
462
463 for (; cur_cls < fat_entries && ncls > 1; ++cur_cls, --ncls)
464 fat[cur_cls] = host2uint32_t_le(++next_cls);
465
466 if (cur_cls == fat_entries) {
467 /* This sector is full, there are no more free entries,
468 * commit the changes to disk and restart from the next
469 * sector.
470 */
471 rc = block_write_direct(service_id, fat_sec++, 1, fat);
472 if (rc != EOK)
473 goto exit;
474 cur_cls = 0;
475 goto loop;
476 } else if (ncls == 1) {
477 /* This is the last cluster of this chain, mark it
478 * with EOF.
479 */
480 fat[cur_cls] = host2uint32_t_le(0xFFFFFFFF);
481 }
482
483 rc = block_write_direct(service_id, fat_sec, 1, fat);
484
485exit:
486 free(fat);
487 return rc;
488}
489
490/** Initialize the allocation bitmap.
491 *
492 * @param service_id The service id.
493 * @param cfg Pointer to the exfat configuration structure.
494 * @return EOK on success or a negative error code.
495 */
496static int
497bitmap_write(service_id_t service_id, exfat_cfg_t *cfg)
498{
499 unsigned long i, sec;
500 unsigned long allocated_cls;
501 int rc = EOK;
502 bool need_reset = true;
503
504 /* Bitmap size in sectors */
505 size_t const bss = div_round_up(cfg->bitmap_size, cfg->sector_size);
506
507 uint8_t *bitmap = malloc(cfg->sector_size);
508 if (!bitmap)
509 return ENOMEM;
510
511 allocated_cls = cfg->allocated_clusters;
512
513 for (sec = 0; sec < bss; ++sec) {
514 if (need_reset) {
515 need_reset = false;
516 memset(bitmap, 0, cfg->sector_size);
517 }
518 if (allocated_cls > 0) {
519 for (i = 0; i < allocated_cls; ++i) {
520 unsigned byte_idx = i / 8;
521 unsigned bit_idx = i % 8;
522
523 if (byte_idx == cfg->sector_size)
524 break;
525 bitmap[byte_idx] |= 1 << bit_idx;
526 }
527
528 allocated_cls -= i;
529 need_reset = true;
530 }
531
532 rc = block_write_direct(service_id,
533 cfg->data_start_sector + sec, 1, bitmap);
534 if (rc != EOK)
535 goto exit;
536 }
537
538exit:
539 free(bitmap);
540 return rc;
541}
542
543/** Write the upcase table to disk. */
544static int
545upcase_table_write(service_id_t service_id, exfat_cfg_t *cfg)
546{
547 int rc = EOK;
548 aoff64_t start_sec, nsecs, i;
549 uint8_t *table_ptr;
550 uint8_t *buf;
551 size_t table_size = sizeof(upcase_table);
552
553 buf = malloc(cfg->sector_size);
554 if (!buf)
555 return ENOENT;
556
557 /* Compute the start sector of the upcase table */
558 start_sec = cfg->data_start_sector;
559 start_sec += ((cfg->upcase_table_cluster - 2) * cfg->cluster_size) /
560 cfg->sector_size;
561
562 /* Compute the number of sectors needed to store the table on disk */
563 nsecs = div_round_up(sizeof(upcase_table), cfg->sector_size);
564 table_ptr = (uint8_t *) upcase_table;
565
566 for (i = 0; i < nsecs; ++i,
567 table_ptr += min(table_size, cfg->sector_size),
568 table_size -= cfg->sector_size) {
569
570 if (table_size < cfg->sector_size) {
571 /* Reset the content of the unused part
572 * of the last sector.
573 */
574 memset(buf, 0, cfg->sector_size);
575 }
576 memcpy(buf, table_ptr, min(table_size, cfg->sector_size));
577
578 rc = block_write_direct(service_id,
579 start_sec + i, 1, buf);
580 if (rc != EOK)
581 goto exit;
582 }
583
584exit:
585 free(buf);
586 return rc;
587}
588
589/** Initialize and write the root directory entries to disk.
590 *
591 * @param service_id The service id.
592 * @param cfg Pointer to the exFAT configuration structure.
593 * @return EOK on success or a negative error code.
594 */
595static int
596root_dentries_write(service_id_t service_id, exfat_cfg_t *cfg)
597{
598 exfat_dentry_t *d;
599 aoff64_t rootdir_sec;
600 int rc;
601 uint8_t *data;
602 unsigned long i;
603
604 data = calloc(cfg->sector_size, 1);
605 if (!data)
606 return ENOMEM;
607
608 d = (exfat_dentry_t *) data;
609
610 /* Initialize the volume label dentry */
611 d->type = EXFAT_TYPE_VOLLABEL;
612 str_to_utf16(d->vollabel.label, 8, "HELENOS ");
613 d->vollabel.size = 8;
614
615 d++;
616
617 /* Initialize the allocation bitmap dentry */
618 d->type = EXFAT_TYPE_BITMAP;
619 d->bitmap.flags = 0; /* First FAT */
620 d->bitmap.firstc = host2uint32_t_le(cfg->bitmap_cluster);
621 d->bitmap.size = host2uint64_t_le(cfg->bitmap_size);
622
623 d++;
624
625 /* Initialize the upcase table dentry */
626 d->type = EXFAT_TYPE_UCTABLE;
627 d->uctable.checksum = host2uint32_t_le(upcase_table_checksum(
628 upcase_table, sizeof(upcase_table)));
629 d->uctable.firstc = host2uint32_t_le(cfg->upcase_table_cluster);
630 d->uctable.size = host2uint64_t_le(sizeof(upcase_table));
631
632 /* Compute the number of the sector where the rootdir resides */
633
634 rootdir_sec = cfg->data_start_sector;
635 rootdir_sec += ((cfg->rootdir_cluster - 2) * cfg->cluster_size) /
636 cfg->sector_size;
637
638 rc = block_write_direct(service_id, rootdir_sec, 1, data);
639 if (rc != EOK)
640 goto exit;
641
642 /* Fill the content of the sectors not used by the
643 * root directory with zeroes.
644 */
645 memset(data, 0, cfg->sector_size);
646 for (i = 1; i < cfg->cluster_size / cfg->sector_size; ++i) {
647 rc = block_write_direct(service_id, rootdir_sec + i, 1, data);
648 if (rc != EOK)
649 goto exit;
650 }
651
652exit:
653 free(data);
654 return rc;
655}
656
657/** Given a number (n), returns the result of log2(n).
658 *
659 * It works only if n is a power of two.
660 */
661static unsigned
662log2(unsigned n)
663{
664 unsigned r;
665
666 for (r = 0;n >> r != 1; ++r);
667
668 return r;
669}
670
671/** Initialize the VBR checksum calculation */
672static uint32_t
673vbr_checksum_start(void const *data, size_t nbytes)
674{
675 uint32_t checksum = 0;
676 size_t index;
677 uint8_t const *octets = (uint8_t *) data;
678
679 for (index = 0; index < nbytes; ++index) {
680 if (index == 106 || index == 107 || index == 112) {
681 /* Skip volume_flags and allocated_percent fields */
682 continue;
683 }
684
685 checksum = ((checksum << 31) | (checksum >> 1)) +
686 octets[index];
687 }
688
689 return checksum;
690}
691
692/** Update the VBR checksum */
693static void
694vbr_checksum_update(void const *data, size_t nbytes, uint32_t *checksum)
695{
696 size_t index;
697 uint8_t const *octets = (uint8_t *) data;
698
699 for (index = 0; index < nbytes; ++index) {
700 *checksum = ((*checksum << 31) | (*checksum >> 1)) +
701 octets[index];
702 }
703}
704
705/** Compute the checksum of the upcase table.
706 *
707 * @param data Pointer to the upcase table.
708 * @param nbytes size of the upcase table in bytes.
709 * @return Checksum value.
710 */
711static uint32_t
712upcase_table_checksum(void const *data, size_t nbytes)
713{
714 size_t index;
715 uint32_t chksum = 0;
716 uint8_t const *octets = (uint8_t *) data;
717
718 for (index = 0; index < nbytes; ++index)
719 chksum = ((chksum << 31) | (chksum >> 1)) + octets[index];
720
721 return chksum;
722}
723
724/** Check if a given number is a power of two.
725 *
726 * @param n The number to check.
727 * @return true if n is a power of two, false otherwise.
728 */
729static bool
730is_power_of_two(unsigned long n)
731{
732 if (n == 0)
733 return false;
734
735 return (n & (n - 1)) == 0;
736}
737
738int main (int argc, char **argv)
739{
740 exfat_cfg_t cfg;
741 uint32_t next_cls;
742 char *dev_path;
743 service_id_t service_id;
744 int rc, c, opt_ind;
745 aoff64_t user_fs_size = 0;
746
747 if (argc < 2) {
748 printf(NAME ": Error, argument missing\n");
749 usage();
750 return 1;
751 }
752
753 cfg.cluster_size = 0;
754
755 for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
756 c = getopt_long(argc, argv, "hs:c:",
757 long_options, &opt_ind);
758 switch (c) {
759 case 'h':
760 usage();
761 return 0;
762 case 's':
763 user_fs_size = (aoff64_t) strtol(optarg, NULL, 10);
764 break;
765
766 case 'c':
767 cfg.cluster_size = strtol(optarg, NULL, 10) * 1024;
768 if (cfg.cluster_size < 4096) {
769 printf(NAME ": Error, cluster size can't"
770 " be less than 4096 byte.\n");
771 return 1;
772 } else if (cfg.cluster_size > 32 * 1024 * 1024) {
773 printf(NAME ": Error, cluster size can't"
774 " be greater than 32 Mb");
775 return 1;
776 }
777
778 if (!is_power_of_two(cfg.cluster_size)) {
779 printf(NAME ": Error, the size of the cluster"
780 " must be a power of two.\n");
781 return 1;
782 }
783 break;
784 }
785 }
786
787 argv += optind;
788 dev_path = *argv;
789
790 if (!dev_path) {
791 printf(NAME ": Error, you must specify a valid block"
792 " device.\n");
793 usage();
794 return 1;
795 }
796
797 printf("Device = %s\n", dev_path);
798
799 rc = loc_service_get_id(dev_path, &service_id, 0);
800 if (rc != EOK) {
801 printf(NAME ": Error resolving device `%s'.\n", dev_path);
802 return 2;
803 }
804
805 rc = block_init(EXCHANGE_SERIALIZE, service_id, 2048);
806 if (rc != EOK) {
807 printf(NAME ": Error initializing libblock.\n");
808 return 2;
809 }
810
811 rc = block_get_bsize(service_id, &cfg.sector_size);
812 if (rc != EOK) {
813 printf(NAME ": Error determining device sector size.\n");
814 return 2;
815 }
816
817 user_fs_size *= cfg.sector_size;
818 if (user_fs_size > 0 && user_fs_size < 1024 * 1024) {
819 printf(NAME ": Error, fs size can't be less"
820 " than 1 Mb.\n");
821 return 1;
822 }
823
824
825 if (cfg.sector_size > 4096) {
826 printf(NAME ": Error, sector size can't be greater" \
827 " than 4096 bytes.\n");
828 return 2;
829 }
830
831 rc = block_get_nblocks(service_id, &cfg.volume_count);
832 if (rc != EOK) {
833 printf(NAME ": Warning, failed to obtain" \
834 " block device size.\n");
835
836 if (user_fs_size == 0) {
837 printf(NAME ": You must specify the" \
838 " filesystem size.\n");
839 return 1;
840 }
841 } else {
842 printf("Block device has %" PRIuOFF64 " blocks.\n",
843 cfg.volume_count);
844 }
845
846 if (user_fs_size != 0) {
847 if (user_fs_size > cfg.volume_count * cfg.sector_size) {
848 printf(NAME ": Error, the device is not big enough"
849 " to create a filesystem of"
850 " the specified size.\n");
851 return 1;
852 }
853
854 cfg.volume_count = user_fs_size / cfg.sector_size;
855 }
856
857 cfg_params_initialize(&cfg);
858 cfg_print_info(&cfg);
859
860 if (cfg.total_clusters <= cfg.allocated_clusters + 2) {
861 printf(NAME ": Error, insufficient disk space on device.\n");
862 return 2;
863 }
864
865 printf("Writing the allocation table.\n");
866
867 /* Initialize the FAT table */
868 rc = fat_initialize(service_id, &cfg);
869 if (rc != EOK) {
870 printf(NAME ": Error, failed to write the FAT to disk\n");
871 return 2;
872 }
873
874 /* Allocate clusters for the bitmap */
875 rc = fat_allocate_clusters(service_id, &cfg, cfg.bitmap_cluster,
876 div_round_up(cfg.bitmap_size, cfg.cluster_size));
877 if (rc != EOK) {
878 printf(NAME ": Error, failed to allocate" \
879 " clusters for bitmap.\n");
880 return 2;
881 }
882
883 next_cls = cfg.bitmap_cluster +
884 div_round_up(cfg.bitmap_size, cfg.cluster_size);
885 cfg.upcase_table_cluster = next_cls;
886
887 /* Allocate clusters for the upcase table */
888 rc = fat_allocate_clusters(service_id, &cfg, next_cls,
889 div_round_up(sizeof(upcase_table), cfg.cluster_size));
890 if (rc != EOK) {
891 printf(NAME ":Error, failed to allocate clusters" \
892 " for the upcase table.\n");
893 return 2;
894 }
895
896 next_cls += div_round_up(sizeof(upcase_table), cfg.cluster_size);
897 cfg.rootdir_cluster = next_cls;
898
899 /* Allocate a cluster for the root directory entry */
900 rc = fat_allocate_clusters(service_id, &cfg, next_cls, 1);
901 if (rc != EOK) {
902 printf(NAME ": Error, failed to allocate cluster" \
903 " for the root dentry.\n");
904 return 2;
905 }
906
907 printf("Writing the allocation bitmap.\n");
908
909 /* Write the allocation bitmap to disk */
910 rc = bitmap_write(service_id, &cfg);
911 if (rc != EOK) {
912 printf(NAME ": Error, failed to write the allocation" \
913 " bitmap to disk.\n");
914 return 2;
915 }
916
917 printf("Writing the upcase table.\n");
918
919 /* Write the upcase table to disk */
920 rc = upcase_table_write(service_id, &cfg);
921 if (rc != EOK) {
922 printf(NAME ": Error, failed to write the" \
923 " upcase table to disk.\n");
924 return 2;
925 }
926
927 printf("Writing the root directory.\n");
928
929 rc = root_dentries_write(service_id, &cfg);
930 if (rc != EOK) {
931 printf(NAME ": Error, failed to write the root directory" \
932 " entries to disk.\n");
933 return 2;
934 }
935
936 printf("Writing the boot sectors.\n");
937
938 rc = bootsec_write(service_id, &cfg);
939 if (rc != EOK) {
940 printf(NAME ": Error, failed to write the VBR to disk\n");
941 return 2;
942 }
943
944 printf("Success.\n");
945
946 return 0;
947}
948
949/**
950 * @}
951 */
952
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