aboutsummaryrefslogtreecommitdiff
path: root/ubi-utils/src/unubi.c
blob: 5c1d3249b234e8ae2ca856a99878ab3dfb5a75dd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
/*
 * Copyright (c) International Business Machines Corp., 2006, 2007
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * Authors: Drake Dowsett, dowsett@de.ibm.com
 *          Frank Haverkamp, haver@vnet.ibm.com
 *
 * 1.2 Removed argp because we want to use uClibc.
 * 1.3 Minor cleanups.
 * 1.4 Meanwhile Drake had done a lot of changes, syncing those.
 * 1.5 Bugfixes, simplifications
 */

/*
 * unubi  reads  an  image  file containing blocks of UBI headers and data
 * (such as produced from nand2bin) and rebuilds the volumes within.   The
 * default  operation  (when  no  flags are given) is to rebuild all valid
 * volumes found in the image. unubi  can  also  read  straight  from  the
 * onboard MTD device (ex. /dev/mtdblock/NAND).
 */

/* TODO: consideration for dynamic vs. static volumes */

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <getopt.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <mtd/ubi-header.h>

#include "crc32.h"
#include "unubi_analyze.h"

#define EXEC		"unubi"
#define CONTACT		"haver@vnet.ibm.com"
#define VERSION		"1.5"

static char doc[] = "\nVersion: " VERSION "\n";
static int debug = 0;

static const char *optionsstr =
"Extract volumes and/or analysis information from an UBI data file.\n"
"When no parameters are flagged or given, the default operation is\n"
"to rebuild all valid complete UBI volumes found within the image.\n"
"\n"
" OPERATIONS\n"
"  -a, --analyze              Analyze image and create gnuplot graphs\n"
"  -i, --info-table           Extract volume information tables\n"
"  -r, --rebuild=<volume-id>  Extract and rebuild volume\n"
"\n"
" OPTIONS\n"
"  -b, --blocksize=<block-size>   Specify size of eraseblocks in image in bytes\n"
"                             (default 128KiB)\n"
"  -d, --dir=<output-dir>     Specify output directory\n"
"  -D, --debug                Enable debug output\n"
"  -s, --headersize=<header-size>   Specify size reserved for metadata in eraseblock\n"
	"                             in bytes (default 2048 Byte)\n"
 /* the -s option might be insufficient when using different vid
    offset than what we used when writing this tool ... Better would
    probably be --vid-hdr-offset or alike */
"\n"
" ADVANCED\n"
"  -e, --eb-split             Generate individual eraseblock images (all\n"
"                             eraseblocks)\n"
"  -v, --vol-split            Generate individual eraseblock images (valid\n"
"                             eraseblocks only)\n"
"  -V, --vol-split!           Raw split by eraseblock (valid eraseblocks only)\n"
"\n"
"  -?, --help                 Give this help list\n"
"      --usage                Give a short usage message\n"
"      --version              Print program version\n"
"\n";

static const char *usage =
"Usage: unubi [-aievV?] [-r <volume-id>] [-b <block-size>] [-d <output-dir>]\n"
"            [-s <header-size>] [--analyze] [--info-table]\n"
"            [--rebuild=<volume-id>] [--blocksize=<block-size>]\n"
"            [--dir=<output-dir>] [--headersize=<header-size>] [--eb-split]\n"
"            [--vol-split] [--vol-split!] [--help] [--usage] [--version]\n"
"            image-file\n";

#define ERR_MSG(fmt...)							\
	fprintf(stderr, EXEC ": " fmt)

#define SPLIT_DATA	1
#define SPLIT_RAW	2

#define DIR_FMT		"unubi_%s"
#define KIB		1024
#define MIB		(KIB * KIB)
#define MAXPATH		KIB

/* filenames */
#define FN_INVAL	"%s/eb%04u%s"			/* invalid eraseblock */
#define FN_NSURE	"%s/eb%04u_%03u_%03u_%03x%s"	/* unsure eraseblock */
#define FN_VALID	"%s/eb%04u_%03u_%03u_%03x%s"	/* valid eraseblock */
#define FN_VOLSP	"%s/vol%03u_%03u_%03u_%04u"	/* split volume */
#define FN_VOLWH	"%s/volume%03u"			/* whole volume */
#define FN_VITBL	"%s/vol_info_table%u"		/* vol info table */

static uint32_t crc32_table[256];

/* struct args:
 *	bsize		int, blocksize of image blocks
 *	hsize		int, eraseblock header size
 *	analyze		flag, when non-zero produce analysis
 *	eb_split	flag, when non-zero output eb####
 *			note: SPLIT_DATA vs. SPLIT_RAW
 *	vol_split	flag, when non-zero output vol###_####
 *			note: SPLIT_DATA vs. SPLIT_RAW
 *	odir_path	string, directory to place volumes in
 *	img_path	string, file to read as ubi image
 *	vols		int array of size UBI_MAX_VOLUMES, where a 1 can be
 *			written for each --rebuild flag in the index specified
 *			then the array can be counted and collapsed using
 *			count_set() and collapse()
 */
struct args {
	int analyze;
	int itable;
	uint32_t *vols;

	size_t vid_hdr_offset;
	size_t data_offset;
	size_t bsize;		/* FIXME replace by vid_hdr/data offs? */
	size_t hsize;

	char *odir_path;
	int eb_split;
	int vol_split;
	char *img_path;

	char **options;
};

struct option long_options[] = {
	{ .name = "rebuild", .has_arg = 1, .flag = NULL, .val = 'r' },
	{ .name = "dir", .has_arg = 1, .flag = NULL, .val = 'd' },
	{ .name = "analyze", .has_arg = 0, .flag = NULL, .val = 'a' },
	{ .name = "blocksize", .has_arg = 1, .flag = NULL, .val = 'b' },
	{ .name = "eb-split", .has_arg = 0, .flag = NULL, .val = 'e' },
	{ .name = "vol-split", .has_arg = 0, .flag = NULL, .val = 'v' },
	{ .name = "vol-split!", .has_arg = 0, .flag = NULL, .val = 'e' },
	{ .name = "help", .has_arg = 0, .flag = NULL, .val = '?' },
	{ .name = "usage", .has_arg = 0, .flag = NULL, .val = 0 },
	{ .name = "version", .has_arg = 0, .flag = NULL, .val = 'J' },
	{ NULL, 0, NULL, 0}
};

/**
 * parses out a numerical value from a string of numbers followed by:
 *	k, K, kib, KiB for kibibyte
 *	m, M, mib, MiB for mebibyte
 **/
static uint32_t
str_to_num(char *str)
{
	char *s;
	ulong num;

	s = str;
	num = strtoul(s, &s, 0);

	if (*s != '\0') {
		if ((strcmp(s, "KiB") == 0) || (strcmp(s, "K") == 0) ||
		    (strcmp(s, "kib") == 0) || (strcmp(s, "k") == 0))
			num *= KIB;
		else if ((strcmp(s, "MiB") == 0) || (strcmp(s, "M") == 0) ||
		    (strcmp(s, "mib") == 0) || (strcmp(s, "m") == 0))
			num *= MIB;
		else
			ERR_MSG("couldn't parse '%s', assuming %lu\n",
				s, num);
	}
	return num;
}

static int
parse_opt(int argc, char **argv, struct args *args)
{
	uint32_t i;

	while (1) {
		int key;

		key = getopt_long(argc, argv, "ab:s:d:Deir:vV?J",
				  long_options, NULL);
		if (key == -1)
			break;

		switch (key) {
		case 'a': /* --analyze */
			args->analyze = 1;
			break;
		case 'b': /* --block-size=<block-size> */
			args->bsize = str_to_num(optarg);
			break;
		case 's': /* --header-size=<header-size> */
			args->hsize = str_to_num(optarg);
			break;
		case 'd': /* --dir=<output-dir> */
			args->odir_path = optarg;
			break;
		case 'D': /* --debug */
			/* I wanted to use -v but that was already
			   used ... */
			debug = 1;
			break;
		case 'e': /* --eb-split */
			args->eb_split = SPLIT_RAW;
			break;
		case 'i': /* --info-table */
			args->itable = 1;
			break;
		case 'r': /* --rebuild=<volume-id> */
			i = str_to_num(optarg);
			if (i < UBI_MAX_VOLUMES)
				args->vols[str_to_num(optarg)] = 1;
			else {
				ERR_MSG("volume-id out of bounds\n");
				return -1;
			}
			break;
		case 'v': /* --vol-split */
			if (args->vol_split != SPLIT_RAW)
				args->vol_split = SPLIT_DATA;
			break;
		case 'V': /* --vol-split! */
			args->vol_split = SPLIT_RAW;
			break;
		case '?': /* help */
			fprintf(stderr,	"Usage: unubi [OPTION...] "
				"image-file\n%s%s\nReport bugs to %s\n",
				doc, optionsstr, CONTACT);
			exit(0);
			break;
		case 'J':
			fprintf(stderr, "%s\n", VERSION);
			exit(0);
			break;
		default:
			fprintf(stderr, "%s", usage);
			exit(-1);
		}
	}

	/* FIXME I suppose hsize should be replaced! */
	args->vid_hdr_offset = args->hsize - UBI_VID_HDR_SIZE;
	args->data_offset = args->hsize;

	if (optind < argc)
		args->img_path = argv[optind++];
	return 0;
}


/**
 * counts the number of indicies which are flagged in full_array;
 * full_array is an array of flags (1/0);
 **/
static size_t
count_set(uint32_t *full_array, size_t full_len)
{
	size_t count, i;

	if (full_array == NULL)
		return 0;

	for (i = 0, count = 0; i < full_len; i++)
		if (full_array[i] != 0)
			count++;

	return count;
}


/**
 * generates coll_array from full_array;
 * full_array is an array of flags (1/0);
 * coll_array is an array of the indicies in full_array which are flagged (1);
 **/
static size_t
collapse(uint32_t *full_array, size_t full_len,
	 uint32_t *coll_array, size_t coll_len)
{
	size_t i, j;

	if ((full_array == NULL) || (coll_array == NULL))
		return 0;

	for (i = 0, j = 0; (i < full_len) && (j < coll_len); i++)
		if (full_array[i] != 0) {
			coll_array[j] = i;
			j++;
		}

	return j;
}

/**
 * data_crc: save the FILE* position, calculate the crc over a span,
 *	reset the position
 * returns non-zero when EOF encountered
 **/
static int
data_crc(FILE* fpin, size_t length, uint32_t *ret_crc)
{
	int rc;
	size_t i;
	char buf[length];
	uint32_t crc;
	fpos_t start;

	rc = fgetpos(fpin, &start);
	if (rc < 0)
		return -1;

	for (i = 0; i < length; i++) {
		int c = fgetc(fpin);
		if (c == EOF) {
			ERR_MSG("unexpected EOF\n");
			return -1;
		}
		buf[i] = (char)c;
	}

	rc = fsetpos(fpin, &start);
	if (rc < 0)
		return -1;

	crc = clc_crc32(crc32_table, UBI_CRC32_INIT, buf, length);
	*ret_crc = crc;
	return 0;
}


/**
 * reads data of size len from fpin and writes it to path
 **/
static int
extract_data(FILE* fpin, size_t len, const char *path)
{
	int rc;
	size_t i;
	FILE* fpout;

	rc = 0;
	fpout = NULL;

	fpout = fopen(path, "wb");
	if (fpout == NULL) {
		ERR_MSG("couldn't open file for writing: %s\n", path);
		rc = -1;
		goto err;
	}

	for (i = 0; i < len; i++) {
		int c = fgetc(fpin);
		if (c == EOF) {
			ERR_MSG("unexpected EOF while writing: %s\n", path);
			rc = -2;
			goto err;
		}
		c = fputc(c, fpout);
		if (c == EOF) {
			ERR_MSG("couldn't write: %s\n", path);
			rc = -3;
			goto err;
		}
	}

 err:
	if (fpout != NULL)
		fclose(fpout);
	return rc;
}


/**
 * extract volume information table from block. saves and reloads fpin
 * position
 * returns -1 when a fpos set or get fails, otherwise <= -2 on other
 * failure and 0 on success
 **/
static int
extract_itable(FILE *fpin, struct eb_info *cur, size_t bsize, size_t num,
	       const char *path)
{
	char filename[MAXPATH + 1];
	int rc;
	size_t i, max;
	fpos_t temp;
	FILE* fpout = NULL;
	struct ubi_vtbl_record rec;

	if (fpin == NULL || cur == NULL || path == NULL)
		return -2;

	/* remember position */
	rc = fgetpos(fpin, &temp);
	if (rc < 0)
		return -1;

	/* jump to top of eraseblock, skip to data section */
	fsetpos(fpin, &cur->eb_top);
	if (rc < 0)
		return -1;
	fseek(fpin, __be32_to_cpu(cur->ec.data_offset), SEEK_CUR);

	/* prepare output file */
	if (__be32_to_cpu(cur->vid.vol_id) != UBI_LAYOUT_VOL_ID)
		return -2;
	memset(filename, 0, MAXPATH + 1);
	snprintf(filename, MAXPATH, FN_VITBL, path, num);
	fpout = fopen(filename, "w");
	if (fpout == NULL)
		return -2;

	/* loop through entries */
	fprintf(fpout,
		"index\trpebs\talign\ttype\tcrc\t\tname\n");
	max = bsize - __be32_to_cpu(cur->ec.data_offset);
	for (i = 0; i < (max / sizeof(rec)); i++) {
		int blank = 1;
		char *ptr, *base;
		char name[UBI_VOL_NAME_MAX + 1];
		const char *type = "unknown\0";
		uint32_t crc;

		/* read record */
		rc = fread(&rec, 1, sizeof(rec), fpin);
		if (rc == 0)
			break;
		if (rc != sizeof(rec)) {
			ERR_MSG("reading volume information "
				"table record failed\n");
			rc = -3;
			goto exit;
		}

		/* check crc */
		crc = clc_crc32(crc32_table, UBI_CRC32_INIT, &rec,
				UBI_VTBL_RECORD_SIZE_CRC);
		if (crc != __be32_to_cpu(rec.crc))
			continue;

		/* check for empty */
		base = (char *)&rec;
		ptr = base;
		while (blank &&
		       ((unsigned)(ptr - base) < UBI_VTBL_RECORD_SIZE_CRC)) {
			if (*ptr != 0)
				blank = 0;
			ptr++;
		}

		if (blank)
			continue;

		/* prep type string */
		if (rec.vol_type == UBI_VID_DYNAMIC)
			type = "dynamic\0";
		else if (rec.vol_type == UBI_VID_STATIC)
			type = "static\0";

		/* prep name string */
		rec.name[__be16_to_cpu(rec.name_len)] = '\0';
		sprintf(name, "%s", rec.name);

		/* print record line to fpout */
		fprintf(fpout, "%u\t%u\t%u\t%s\t0x%08x\t%s\n",
			i,
			__be32_to_cpu(rec.reserved_pebs),
			__be32_to_cpu(rec.alignment),
			type,
			__be32_to_cpu(rec.crc),
			name);
	}

 exit:
	/* reset position */
	if (fsetpos(fpin, &temp) < 0)
		rc = -1;

	if (fpout != NULL)
		fclose(fpout);

	return rc;
}


/**
 * using eb chain, tries to rebuild the data of volume at vol_id, or for all
 * the known volumes, if vol_id is NULL;
 **/
static int
rebuild_volume(FILE * fpin, uint32_t *vol_id, struct eb_info **head,
	       const char *path, size_t block_size, size_t header_size)
{
	char filename[MAXPATH];
	int rc;
	uint32_t vol, num, data_size;
	FILE* fpout;
	struct eb_info *cur;

	rc = 0;

	if ((fpin == NULL) || (head == NULL) || (*head == NULL))
		return 0;

	/* when vol_id is null, then do all  */
	if (vol_id == NULL) {
		cur = *head;
		vol = __be32_to_cpu(cur->vid.vol_id);
	} else {
		vol = *vol_id;
		eb_chain_position(head, vol, NULL, &cur);
		if (cur == NULL) {
			if (debug)
				ERR_MSG("no valid volume %d was found\n", vol);
			return -1;
		}
	}

	num = 0;
	snprintf(filename, MAXPATH, FN_VOLWH, path, vol);
	fpout = fopen(filename, "wb");
	if (fpout == NULL) {
		ERR_MSG("couldn't open file for writing: %s\n", filename);
		return -1;
	}

	while (cur != NULL) {
		size_t i;

		if (__be32_to_cpu(cur->vid.vol_id) != vol) {
			/* close out file */
			fclose(fpout);

			/* only stay around if that was the only volume */
			if (vol_id != NULL)
				goto out;

			/* begin with next */
			vol = __be32_to_cpu(cur->vid.vol_id);
			num = 0;
			snprintf(filename, MAXPATH, FN_VOLWH, path, vol);
			fpout = fopen(filename, "wb");
			if (fpout == NULL) {
				ERR_MSG("couldn't open file for writing: %s\n",
					filename);
				return -1;
			}
		}

		while (num < __be32_to_cpu(cur->vid.lnum)) {
			/* FIXME haver: I hope an empty block is
			   written out so that the binary has no holes
			   ... */
			if (debug)
				ERR_MSG("missing valid block %d for volume %d\n",
					num, vol);
			num++;
		}

		rc = fsetpos(fpin, &(cur->eb_top));
		if (rc < 0)
			goto out;
		fseek(fpin, __be32_to_cpu(cur->ec.data_offset), SEEK_CUR);

		if (cur->vid.vol_type == UBI_VID_DYNAMIC)
			/* FIXME It might be that alignment has influence */
			data_size = block_size - header_size;
		else
			data_size = __be32_to_cpu(cur->vid.data_size);

		for (i = 0; i < data_size; i++) {
			int c = fgetc(fpin);
			if (c == EOF) {
				ERR_MSG("unexpected EOF while writing: %s\n",
					filename);
				rc = -2;
				goto out;
			}
			c = fputc(c, fpout);
			if (c == EOF) {
				ERR_MSG("couldn't write: %s\n", filename);
				rc = -3;
				goto out;
			}
		}

		cur = cur->next;
		num++;
	}

 out:
	if (vol_id == NULL)
		fclose(fpout);
	return rc;
}


/**
 * traverses FILE* trying to load complete, valid and accurate header data
 * into the eb chain;
 **/
static int
unubi_volumes(FILE* fpin, uint32_t *vols, size_t vc, struct args *a)
{
	char filename[MAXPATH + 1];
	char reason[MAXPATH + 1];
	int rc;
	size_t i, count, itable_num;
	/* relations:
	 * cur ~ head
	 * next ~ first */
	struct eb_info *head, *cur, *first, *next;
	struct eb_info **next_ptr;

	rc = 0;
	count = 0;
	itable_num = 0;
	head = NULL;
	first = NULL;
	next = NULL;
	cur = malloc(sizeof(*cur));
	if (cur == NULL) {
		ERR_MSG("out of memory\n");
		rc = -ENOMEM;
		goto err;
	}
	memset(cur, 0, sizeof(*cur));

	fgetpos(fpin, &(cur->eb_top));
	while (1) {
		const char *raw_path;
		uint32_t crc;

		cur->phys_addr = ftell(fpin);
		cur->phys_block = cur->phys_addr / a->bsize;
		cur->data_crc_ok = 0;
		cur->ec_crc_ok   = 0;
		cur->vid_crc_ok  = 0;

		memset(filename, 0, MAXPATH + 1);
		memset(reason, 0, MAXPATH + 1);

		/* in case of an incomplete ec header */
		raw_path = FN_INVAL;

		/* read erasecounter header */
		rc = fread(&cur->ec, 1, sizeof(cur->ec), fpin);
		if (rc == 0)
			goto out; /* EOF */
		if (rc != sizeof(cur->ec)) {
			ERR_MSG("reading ec-hdr failed\n");
			rc = -1;
			goto err;
		}

		/* check erasecounter header magic */
		if (__be32_to_cpu(cur->ec.magic) != UBI_EC_HDR_MAGIC) {
			snprintf(reason, MAXPATH, ".invalid.ec_magic");
			goto invalid;
		}

		/* check erasecounter header crc */
		crc = clc_crc32(crc32_table, UBI_CRC32_INIT, &(cur->ec),
				UBI_EC_HDR_SIZE_CRC);
		if (__be32_to_cpu(cur->ec.hdr_crc) != crc) {
			snprintf(reason, MAXPATH, ".invalid.ec_hdr_crc");
			goto invalid;
		}

		/* read volume id header */
		rc = fsetpos(fpin, &(cur->eb_top));
		if (rc != 0)
			goto err;
		fseek(fpin, __be32_to_cpu(cur->ec.vid_hdr_offset), SEEK_CUR);
		rc = fread(&cur->vid, 1, sizeof(cur->vid), fpin);
		if (rc == 0)
			goto out; /* EOF */
		if (rc != sizeof(cur->vid)) {
			ERR_MSG("reading vid-hdr failed\n");
			rc = -1;
			goto err;
		}

		/* if the magic number is 0xFFFFFFFF, then it's very likely
		 * that the volume is empty */
		if (__be32_to_cpu(cur->vid.magic) == 0xffffffff) {
			snprintf(reason, MAXPATH, ".empty");
			goto invalid;
		}

		/* vol_id should be in bounds */
		if ((__be32_to_cpu(cur->vid.vol_id) >= UBI_MAX_VOLUMES) &&
		    (__be32_to_cpu(cur->vid.vol_id) <
		     UBI_INTERNAL_VOL_START)) {
			snprintf(reason, MAXPATH, ".invalid");
			goto invalid;
		} else
			raw_path = FN_NSURE;

		/* check volume id header magic */
		if (__be32_to_cpu(cur->vid.magic) != UBI_VID_HDR_MAGIC) {
			snprintf(reason, MAXPATH, ".invalid.vid_magic");
			goto invalid;
		}
		cur->ec_crc_ok = 1;

		/* check volume id header crc */
		crc = clc_crc32(crc32_table, UBI_CRC32_INIT, &(cur->vid),
				UBI_VID_HDR_SIZE_CRC);
		if (__be32_to_cpu(cur->vid.hdr_crc) != crc) {
			snprintf(reason, MAXPATH, ".invalid.vid_hdr_crc");
			goto invalid;
		}
		cur->vid_crc_ok = 1;

		/* check data crc, but only for a static volume */
		if (cur->vid.vol_type == UBI_VID_STATIC) {
			rc = data_crc(fpin, __be32_to_cpu(cur->vid.data_size),
				      &crc);
			if (rc < 0)
				goto err;
			if (__be32_to_cpu(cur->vid.data_crc) != crc) {
				snprintf(reason, MAXPATH, ".invalid.data_crc");
				goto invalid;
			}
			cur->data_crc_ok = 1;
		}

		/* enlist this vol, it's valid */
		raw_path = FN_VALID;
		cur->linear = count;
		rc = eb_chain_insert(&head, cur);
		if (rc < 0) {
			if (rc == -ENOMEM) {
				ERR_MSG("out of memory\n");
				goto err;
			}
			ERR_MSG("unknown and unexpected error, please contact "
				CONTACT "\n");
			goto err;
		}

		/* extract info-table */
		if (a->itable &&
		    (__be32_to_cpu(cur->vid.vol_id) == UBI_LAYOUT_VOL_ID)) {
			extract_itable(fpin, cur, a->bsize,
				       itable_num, a->odir_path);
			itable_num++;
		}

		/* split volumes */
		if (a->vol_split) {
			size_t size = 0;

			rc = fsetpos(fpin, &(cur->eb_top));
			if (rc != 0)
				goto err;

			/*
			 * FIXME For dynamic UBI volumes we must write
			 * the maximum available data. The
			 * vid.data_size field is not used in this
			 * case. The dynamic volume user is
			 * responsible for the content.
			 */
			if (a->vol_split == SPLIT_DATA) {
				/* Write only data section */
				if (cur->vid.vol_type == UBI_VID_DYNAMIC) {
					/* FIXME Formular is not
					   always right ... */
					size = a->bsize - a->hsize;
				} else
					size = __be32_to_cpu(cur->vid.data_size);

				fseek(fpin,
				      __be32_to_cpu(cur->ec.data_offset),
				      SEEK_CUR);
			}
			else if (a->vol_split == SPLIT_RAW)
				/* write entire eraseblock */
				size = a->bsize;

			snprintf(filename, MAXPATH, FN_VOLSP,
				 a->odir_path,
				 __be32_to_cpu(cur->vid.vol_id),
				 __be32_to_cpu(cur->vid.lnum),
				 __be32_to_cpu(cur->vid.leb_ver), count);
			rc = extract_data(fpin, size, filename);
			if (rc < 0)
				goto err;
		}

 invalid:
		/* split eraseblocks */
		if (a->eb_split) {
			/* jump to top of block */
			rc = fsetpos(fpin, &(cur->eb_top));
			if (rc != 0)
				goto err;

			if (strcmp(raw_path, FN_INVAL) == 0)
				snprintf(filename, MAXPATH, raw_path,
					 a->odir_path, count, reason);
			else
				snprintf(filename, MAXPATH, raw_path,
					 a->odir_path,
					 count,
					 __be32_to_cpu(cur->vid.vol_id),
					 __be32_to_cpu(cur->vid.lnum),
					 __be32_to_cpu(cur->vid.leb_ver),
					 reason);

			rc = extract_data(fpin, a->bsize, filename);
			if (rc < 0)
				goto err;
		}

		/* append to simple linked list */
		if (first == NULL)
			next_ptr = &first;
		else
			next_ptr = &next->next;

		*next_ptr = malloc(sizeof(**next_ptr));
		if (*next_ptr == NULL) {
			ERR_MSG("out of memory\n");
			rc = -ENOMEM;
			goto err;
		}
		memset(*next_ptr, 0, sizeof(**next_ptr));

		next = *next_ptr;
		memcpy(next, cur, sizeof(*next));
		next->next = NULL;

		count++;
		rc = fsetpos(fpin, &(cur->eb_top));
		if (rc != 0)
			goto err;
		fseek(fpin, a->bsize, SEEK_CUR);
		memset(cur, 0, sizeof(*cur));

		fgetpos(fpin, &(cur->eb_top));
	}

 out:
	for (i = 0; i < vc; i++) {
		rc = rebuild_volume(fpin, &vols[i], &head, a->odir_path,
			       a->bsize, a->hsize);
		if (rc < 0)
			goto err;
	}

	/* if there were no volumes specified, rebuild them all,
	 * UNLESS eb_ or vol_ split or analyze was specified */
	if ((vc == 0) && (!a->eb_split) && (!a->vol_split) &&
	    (!a->analyze) && (!a->itable)) {
		rc = rebuild_volume(fpin, NULL, &head, a->odir_path, a->bsize,
				    a->hsize);
		if (rc < 0)
			goto err;
	}

 err:
	free(cur);

	if (a->analyze) {
		char fname[PATH_MAX];
		FILE *fp;

		unubi_analyze(&head, first, a->odir_path);

		/* prepare output files */
		memset(fname, 0, PATH_MAX + 1);
		snprintf(fname, PATH_MAX, "%s/%s", a->odir_path, FN_EH_STAT);
		fp = fopen(fname, "w");
		if (fp != NULL) {
			eb_chain_print(fp, head);
			fclose(fp);
		}
	}
	eb_chain_destroy(&head);
	eb_chain_destroy(&first);

	return rc;
}


/**
 * handles command line arguments, then calls unubi_volumes
 **/
int
main(int argc, char *argv[])
{
	int rc, free_a_odir;
	size_t vols_len;
	uint32_t *vols;
	FILE* fpin;
	struct args a;

	rc = 0;
	free_a_odir = 0;
	vols_len = 0;
	vols = NULL;
	fpin = NULL;
	init_crc32_table(crc32_table);

	/* setup struct args a */
	memset(&a, 0, sizeof(a));
	a.bsize = 128 * KIB;
	a.hsize = 2 * KIB;
	a.vols = malloc(sizeof(*a.vols) * UBI_MAX_VOLUMES);
	if (a.vols == NULL) {
		ERR_MSG("out of memory\n");
		rc = ENOMEM;
		goto err;
	}
	memset(a.vols, 0, sizeof(*a.vols) * UBI_MAX_VOLUMES);

	/* parse args and check for validity */
	parse_opt(argc, argv, &a);
	if (a.img_path == NULL) {
		ERR_MSG("no image file specified\n");
		rc = EINVAL;
		goto err;
	}
	else if (a.odir_path == NULL) {
		char *ptr;
		int len;

		ptr = strrchr(a.img_path, '/');
		if (ptr == NULL)
			ptr = a.img_path;
		else
			ptr++;

		len = strlen(DIR_FMT) + strlen(ptr);
		free_a_odir = 1;
		a.odir_path = malloc(sizeof(*a.odir_path) * len);
		if (a.odir_path == NULL) {
			ERR_MSG("out of memory\n");
			rc = ENOMEM;
			goto err;
		}
		snprintf(a.odir_path, len, DIR_FMT, ptr);
	}

	fpin = fopen(a.img_path, "rb");
	if (fpin == NULL) {
		ERR_MSG("couldn't open file for reading: "
			"%s\n", a.img_path);
		rc = EINVAL;
		goto err;
	}

	rc = mkdir(a.odir_path, 0777);
	if ((rc < 0) && (errno != EEXIST)) {
		ERR_MSG("couldn't create ouput directory: "
			"%s\n", a.odir_path);
		rc = -rc;
		goto err;
	}

	/* fill in vols array */
	vols_len = count_set(a.vols, UBI_MAX_VOLUMES);
	if (vols_len > 0) {
		vols = malloc(sizeof(*vols) * vols_len);
		if (vols == NULL) {
			ERR_MSG("out of memory\n");
			rc = ENOMEM;
			goto err;
		}
		collapse(a.vols, UBI_MAX_VOLUMES, vols, vols_len);
	}

	/* unubi volumes */
	rc = unubi_volumes(fpin, vols, vols_len, &a);
	if (rc < 0) {
		/* ERR_MSG("error encountered while working on image file: "
		   "%s\n", a.img_path); */
		rc = -rc;
		goto err;
	}

 err:
	free(a.vols);
	if (free_a_odir != 0)
		free(a.odir_path);
	if (fpin != NULL)
		fclose(fpin);
	if (vols_len > 0)
		free(vols);
	return rc;
}