forked from devttys0/sasquatch
-
Notifications
You must be signed in to change notification settings - Fork 10
/
unsquashfs.c
3008 lines (2522 loc) · 77.4 KB
/
unsquashfs.c
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
/*
* Unsquash a squashfs filesystem. This is a highly compressed read only
* filesystem.
*
* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
* 2012, 2013, 2014
* Phillip Lougher <phillip@squashfs.org.uk>
*
* 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,
* 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* unsquashfs.c
*/
#include "unsquashfs.h"
#include "squashfs_swap.h"
#include "squashfs_compat.h"
#include "compressor.h"
#include "xattr.h"
#include "unsquashfs_info.h"
#include "stdarg.h"
#include <sys/sysinfo.h>
#include <sys/sysmacros.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <limits.h>
#include <ctype.h>
struct cache *fragment_cache, *data_cache;
struct queue *to_reader, *to_inflate, *to_writer, *from_writer;
pthread_t *thread, *inflator_thread;
pthread_mutex_t fragment_mutex;
/* user options that control parallelisation */
//int processors = -1;
// CJH: Temporarily set the default processor count to 1 to prevent threading bug
// until a proper fix is implemented.
int processors = 1;
struct super_block sBlk;
squashfs_operations s_ops;
// CJH: Initialize to NULL
struct compressor *comp = NULL;
// CJH: Add override struct
struct override_table override = { 0 };
// CJH: Initialize swap to -1
int bytes = 0, swap = -1, file_count = 0, dir_count = 0, sym_count = 0,
dev_count = 0, fifo_count = 0;
char *inode_table = NULL, *directory_table = NULL;
struct hash_table_entry *inode_table_hash[65536], *directory_table_hash[65536];
int fd;
unsigned int *uid_table, *guid_table;
unsigned int cached_frag = SQUASHFS_INVALID_FRAG;
char *fragment_data;
char *file_data;
char *data;
unsigned int block_size;
unsigned int block_log;
int lsonly = FALSE, info = FALSE, force = FALSE, short_ls = TRUE;
int use_regex = FALSE;
char **created_inode;
int root_process;
int columns;
int rotate = 0;
pthread_mutex_t screen_mutex;
int progress = TRUE, progress_enabled = FALSE;
unsigned int total_blocks = 0, total_files = 0, total_inodes = 0;
unsigned int cur_blocks = 0;
int inode_number = 1;
int no_xattrs = XATTR_DEF;
int user_xattrs = FALSE;
int lookup_type[] = {
0,
S_IFDIR,
S_IFREG,
S_IFLNK,
S_IFBLK,
S_IFCHR,
S_IFIFO,
S_IFSOCK,
S_IFDIR,
S_IFREG,
S_IFLNK,
S_IFBLK,
S_IFCHR,
S_IFIFO,
S_IFSOCK
};
struct test table[] = {
{ S_IFMT, S_IFSOCK, 0, 's' },
{ S_IFMT, S_IFLNK, 0, 'l' },
{ S_IFMT, S_IFBLK, 0, 'b' },
{ S_IFMT, S_IFDIR, 0, 'd' },
{ S_IFMT, S_IFCHR, 0, 'c' },
{ S_IFMT, S_IFIFO, 0, 'p' },
{ S_IRUSR, S_IRUSR, 1, 'r' },
{ S_IWUSR, S_IWUSR, 2, 'w' },
{ S_IRGRP, S_IRGRP, 4, 'r' },
{ S_IWGRP, S_IWGRP, 5, 'w' },
{ S_IROTH, S_IROTH, 7, 'r' },
{ S_IWOTH, S_IWOTH, 8, 'w' },
{ S_IXUSR | S_ISUID, S_IXUSR | S_ISUID, 3, 's' },
{ S_IXUSR | S_ISUID, S_ISUID, 3, 'S' },
{ S_IXUSR | S_ISUID, S_IXUSR, 3, 'x' },
{ S_IXGRP | S_ISGID, S_IXGRP | S_ISGID, 6, 's' },
{ S_IXGRP | S_ISGID, S_ISGID, 6, 'S' },
{ S_IXGRP | S_ISGID, S_IXGRP, 6, 'x' },
{ S_IXOTH | S_ISVTX, S_IXOTH | S_ISVTX, 9, 't' },
{ S_IXOTH | S_ISVTX, S_ISVTX, 9, 'T' },
{ S_IXOTH | S_ISVTX, S_IXOTH, 9, 'x' },
{ 0, 0, 0, 0}
};
void progress_bar(long long current, long long max, int columns);
#define MAX_LINE 16384
void prep_exit()
{
}
void sigwinch_handler()
{
struct winsize winsize;
if(ioctl(1, TIOCGWINSZ, &winsize) == -1) {
if(isatty(STDOUT_FILENO))
ERROR("TIOCGWINSZ ioctl failed, defaulting to 80 "
"columns\n");
columns = 80;
} else
columns = winsize.ws_col;
}
void sigalrm_handler()
{
rotate = (rotate + 1) % 4;
}
int add_overflow(int a, int b)
{
return (INT_MAX - a) < b;
}
int shift_overflow(int a, int shift)
{
return (INT_MAX >> shift) < a;
}
int multiply_overflow(int a, int multiplier)
{
return (INT_MAX / multiplier) < a;
}
struct queue *queue_init(int size)
{
struct queue *queue = malloc(sizeof(struct queue));
if(queue == NULL)
EXIT_UNSQUASH("Out of memory in queue_init\n");
if(add_overflow(size, 1) ||
multiply_overflow(size + 1, sizeof(void *)))
EXIT_UNSQUASH("Size too large in queue_init\n");
queue->data = malloc(sizeof(void *) * (size + 1));
if(queue->data == NULL)
EXIT_UNSQUASH("Out of memory in queue_init\n");
queue->size = size + 1;
queue->readp = queue->writep = 0;
pthread_mutex_init(&queue->mutex, NULL);
pthread_cond_init(&queue->empty, NULL);
pthread_cond_init(&queue->full, NULL);
return queue;
}
void queue_put(struct queue *queue, void *data)
{
int nextp;
pthread_mutex_lock(&queue->mutex);
while((nextp = (queue->writep + 1) % queue->size) == queue->readp)
pthread_cond_wait(&queue->full, &queue->mutex);
queue->data[queue->writep] = data;
queue->writep = nextp;
pthread_cond_signal(&queue->empty);
pthread_mutex_unlock(&queue->mutex);
}
void *queue_get(struct queue *queue)
{
void *data;
pthread_mutex_lock(&queue->mutex);
while(queue->readp == queue->writep)
pthread_cond_wait(&queue->empty, &queue->mutex);
data = queue->data[queue->readp];
queue->readp = (queue->readp + 1) % queue->size;
pthread_cond_signal(&queue->full);
pthread_mutex_unlock(&queue->mutex);
return data;
}
void dump_queue(struct queue *queue)
{
pthread_mutex_lock(&queue->mutex);
printf("Max size %d, size %d%s\n", queue->size - 1,
queue->readp <= queue->writep ? queue->writep - queue->readp :
queue->size - queue->readp + queue->writep,
queue->readp == queue->writep ? " (EMPTY)" :
((queue->writep + 1) % queue->size) == queue->readp ?
" (FULL)" : "");
pthread_mutex_unlock(&queue->mutex);
}
/* Called with the cache mutex held */
void insert_hash_table(struct cache *cache, struct cache_entry *entry)
{
int hash = CALCULATE_HASH(entry->block);
entry->hash_next = cache->hash_table[hash];
cache->hash_table[hash] = entry;
entry->hash_prev = NULL;
if(entry->hash_next)
entry->hash_next->hash_prev = entry;
}
/* Called with the cache mutex held */
void remove_hash_table(struct cache *cache, struct cache_entry *entry)
{
if(entry->hash_prev)
entry->hash_prev->hash_next = entry->hash_next;
else
cache->hash_table[CALCULATE_HASH(entry->block)] =
entry->hash_next;
if(entry->hash_next)
entry->hash_next->hash_prev = entry->hash_prev;
entry->hash_prev = entry->hash_next = NULL;
}
/* Called with the cache mutex held */
void insert_free_list(struct cache *cache, struct cache_entry *entry)
{
if(cache->free_list) {
entry->free_next = cache->free_list;
entry->free_prev = cache->free_list->free_prev;
cache->free_list->free_prev->free_next = entry;
cache->free_list->free_prev = entry;
} else {
cache->free_list = entry;
entry->free_prev = entry->free_next = entry;
}
}
/* Called with the cache mutex held */
void remove_free_list(struct cache *cache, struct cache_entry *entry)
{
if(entry->free_prev == NULL || entry->free_next == NULL)
/* not in free list */
return;
else if(entry->free_prev == entry && entry->free_next == entry) {
/* only this entry in the free list */
cache->free_list = NULL;
} else {
/* more than one entry in the free list */
entry->free_next->free_prev = entry->free_prev;
entry->free_prev->free_next = entry->free_next;
if(cache->free_list == entry)
cache->free_list = entry->free_next;
}
entry->free_prev = entry->free_next = NULL;
}
struct cache *cache_init(int buffer_size, int max_buffers)
{
struct cache *cache = malloc(sizeof(struct cache));
if(cache == NULL)
EXIT_UNSQUASH("Out of memory in cache_init\n");
cache->max_buffers = max_buffers;
cache->buffer_size = buffer_size;
cache->count = 0;
cache->used = 0;
cache->free_list = NULL;
memset(cache->hash_table, 0, sizeof(struct cache_entry *) * 65536);
cache->wait_free = FALSE;
cache->wait_pending = FALSE;
pthread_mutex_init(&cache->mutex, NULL);
pthread_cond_init(&cache->wait_for_free, NULL);
pthread_cond_init(&cache->wait_for_pending, NULL);
return cache;
}
struct cache_entry *cache_get(struct cache *cache, long long block, int size)
{
/*
* Get a block out of the cache. If the block isn't in the cache
* it is added and queued to the reader() and inflate() threads for
* reading off disk and decompression. The cache grows until max_blocks
* is reached, once this occurs existing discarded blocks on the free
* list are reused
*/
int hash = CALCULATE_HASH(block);
struct cache_entry *entry;
pthread_mutex_lock(&cache->mutex);
for(entry = cache->hash_table[hash]; entry; entry = entry->hash_next)
if(entry->block == block)
break;
if(entry) {
/*
* found the block in the cache. If the block is currently unused
* remove it from the free list and increment cache used count.
*/
if(entry->used == 0) {
cache->used ++;
remove_free_list(cache, entry);
}
entry->used ++;
pthread_mutex_unlock(&cache->mutex);
} else {
/*
* not in the cache
*
* first try to allocate new block
*/
if(cache->count < cache->max_buffers) {
entry = malloc(sizeof(struct cache_entry));
if(entry == NULL)
EXIT_UNSQUASH("Out of memory in cache_get\n");
entry->data = malloc(cache->buffer_size);
if(entry->data == NULL)
EXIT_UNSQUASH("Out of memory in cache_get\n");
entry->cache = cache;
entry->free_prev = entry->free_next = NULL;
cache->count ++;
} else {
/*
* try to get from free list
*/
while(cache->free_list == NULL) {
cache->wait_free = TRUE;
pthread_cond_wait(&cache->wait_for_free,
&cache->mutex);
}
entry = cache->free_list;
remove_free_list(cache, entry);
remove_hash_table(cache, entry);
}
/*
* Initialise block and insert into the hash table.
* Increment used which tracks how many buffers in the
* cache are actively in use (the other blocks, count - used,
* are in the cache and available for lookup, but can also be
* re-used).
*/
entry->block = block;
entry->size = size;
entry->used = 1;
entry->error = FALSE;
entry->pending = TRUE;
insert_hash_table(cache, entry);
cache->used ++;
/*
* queue to read thread to read and ultimately (via the
* decompress threads) decompress the buffer
*/
pthread_mutex_unlock(&cache->mutex);
queue_put(to_reader, entry);
}
return entry;
}
void cache_block_ready(struct cache_entry *entry, int error)
{
/*
* mark cache entry as being complete, reading and (if necessary)
* decompression has taken place, and the buffer is valid for use.
* If an error occurs reading or decompressing, the buffer also
* becomes ready but with an error...
*/
pthread_mutex_lock(&entry->cache->mutex);
entry->pending = FALSE;
entry->error = error;
/*
* if the wait_pending flag is set, one or more threads may be waiting
* on this buffer
*/
if(entry->cache->wait_pending) {
entry->cache->wait_pending = FALSE;
pthread_cond_broadcast(&entry->cache->wait_for_pending);
}
pthread_mutex_unlock(&entry->cache->mutex);
}
void cache_block_wait(struct cache_entry *entry)
{
/*
* wait for this cache entry to become ready, when reading and (if
* necessary) decompression has taken place
*/
pthread_mutex_lock(&entry->cache->mutex);
while(entry->pending) {
entry->cache->wait_pending = TRUE;
pthread_cond_wait(&entry->cache->wait_for_pending,
&entry->cache->mutex);
}
pthread_mutex_unlock(&entry->cache->mutex);
}
void cache_block_put(struct cache_entry *entry)
{
/*
* finished with this cache entry, once the usage count reaches zero it
* can be reused and is put onto the free list. As it remains
* accessible via the hash table it can be found getting a new lease of
* life before it is reused.
*/
pthread_mutex_lock(&entry->cache->mutex);
entry->used --;
if(entry->used == 0) {
insert_free_list(entry->cache, entry);
entry->cache->used --;
/*
* if the wait_free flag is set, one or more threads may be
* waiting on this buffer
*/
if(entry->cache->wait_free) {
entry->cache->wait_free = FALSE;
pthread_cond_broadcast(&entry->cache->wait_for_free);
}
}
pthread_mutex_unlock(&entry->cache->mutex);
}
void dump_cache(struct cache *cache)
{
pthread_mutex_lock(&cache->mutex);
printf("Max buffers %d, Current size %d, Used %d, %s\n",
cache->max_buffers, cache->count, cache->used,
cache->free_list ? "Free buffers" : "No free buffers");
pthread_mutex_unlock(&cache->mutex);
}
char *modestr(char *str, int mode)
{
int i;
strcpy(str, "----------");
for(i = 0; table[i].mask != 0; i++) {
if((mode & table[i].mask) == table[i].value)
str[table[i].position] = table[i].mode;
}
return str;
}
#define TOTALCHARS 25
int print_filename(char *pathname, struct inode *inode)
{
char str[11], dummy[12], dummy2[12]; /* overflow safe */
char *userstr, *groupstr;
int padchars;
struct passwd *user;
struct group *group;
struct tm *t;
if(short_ls) {
printf("%s\n", pathname);
return 1;
}
user = getpwuid(inode->uid);
if(user == NULL) {
int res = snprintf(dummy, 12, "%d", inode->uid);
if(res < 0)
EXIT_UNSQUASH("snprintf failed in print_filename()\n");
else if(res >= 12)
/* unsigned int shouldn't ever need more than 11 bytes
* (including terminating '\0') to print in base 10 */
userstr = "*";
else
userstr = dummy;
} else
userstr = user->pw_name;
group = getgrgid(inode->gid);
if(group == NULL) {
int res = snprintf(dummy2, 12, "%d", inode->gid);
if(res < 0)
EXIT_UNSQUASH("snprintf failed in print_filename()\n");
else if(res >= 12)
/* unsigned int shouldn't ever need more than 11 bytes
* (including terminating '\0') to print in base 10 */
groupstr = "*";
else
groupstr = dummy2;
} else
groupstr = group->gr_name;
printf("%s %s/%s ", modestr(str, inode->mode), userstr, groupstr);
switch(inode->mode & S_IFMT) {
case S_IFREG:
case S_IFDIR:
case S_IFSOCK:
case S_IFIFO:
case S_IFLNK:
padchars = TOTALCHARS - strlen(userstr) -
strlen(groupstr);
printf("%*lld ", padchars > 0 ? padchars : 0,
inode->data);
break;
case S_IFCHR:
case S_IFBLK:
padchars = TOTALCHARS - strlen(userstr) -
strlen(groupstr) - 7;
printf("%*s%3d,%3d ", padchars > 0 ? padchars : 0, " ",
(int) inode->data >> 8, (int) inode->data &
0xff);
break;
}
t = localtime(&inode->time);
printf("%d-%02d-%02d %02d:%02d %s", t->tm_year + 1900, t->tm_mon + 1,
t->tm_mday, t->tm_hour, t->tm_min, pathname);
if((inode->mode & S_IFMT) == S_IFLNK)
printf(" -> %s", inode->symlink);
printf("\n");
return 1;
}
void add_entry(struct hash_table_entry *hash_table[], long long start,
int bytes)
{
int hash = CALCULATE_HASH(start);
struct hash_table_entry *hash_table_entry;
hash_table_entry = malloc(sizeof(struct hash_table_entry));
if(hash_table_entry == NULL)
EXIT_UNSQUASH("Out of memory in add_entry\n");
hash_table_entry->start = start;
hash_table_entry->bytes = bytes;
hash_table_entry->next = hash_table[hash];
hash_table[hash] = hash_table_entry;
}
int lookup_entry(struct hash_table_entry *hash_table[], long long start)
{
int hash = CALCULATE_HASH(start);
struct hash_table_entry *hash_table_entry;
for(hash_table_entry = hash_table[hash]; hash_table_entry;
hash_table_entry = hash_table_entry->next)
if(hash_table_entry->start == start)
return hash_table_entry->bytes;
return -1;
}
int read_fs_bytes(int fd, long long byte, int bytes, void *buff)
{
off_t off = byte;
int res, count;
TRACE("read_bytes: reading from position 0x%llx, bytes %d\n", byte,
bytes);
if(lseek(fd, off, SEEK_SET) == -1) {
ERROR("Lseek failed because %s\n", strerror(errno));
return FALSE;
}
for(count = 0; count < bytes; count += res) {
res = read(fd, buff + count, bytes - count);
if(res < 1) {
if(res == 0) {
ERROR("Read on filesystem failed because "
"EOF\n");
return FALSE;
} else if(errno != EINTR) {
ERROR("Read on filesystem failed because %s\n",
strerror(errno));
return FALSE;
} else
res = 0;
}
}
return TRUE;
}
int read_block(int fd, long long start, long long *next, int expected,
void *block)
{
unsigned short c_byte;
int offset = 2, res, compressed;
int outlen = expected ? expected : SQUASHFS_METADATA_SIZE;
if(swap) {
if(read_fs_bytes(fd, start, 2, &c_byte) == FALSE)
goto failed;
c_byte = (c_byte >> 8) | ((c_byte & 0xff) << 8);
} else
if(read_fs_bytes(fd, start, 2, &c_byte) == FALSE)
goto failed;
TRACE("read_block: block @0x%llx, %d %s bytes\n", start,
SQUASHFS_COMPRESSED_SIZE(c_byte), SQUASHFS_COMPRESSED(c_byte) ?
"compressed" : "uncompressed");
if(SQUASHFS_CHECK_DATA(sBlk.s.flags))
offset = 3;
compressed = SQUASHFS_COMPRESSED(c_byte);
c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
/*
* The block size should not be larger than
* the uncompressed size (or max uncompressed size if
* expected is 0)
*/
if(c_byte > outlen)
return 0;
if(compressed) {
char buffer[c_byte];
int error;
res = read_fs_bytes(fd, start + offset, c_byte, buffer);
if(res == FALSE)
goto failed;
res = compressor_uncompress(comp, block, buffer, c_byte,
outlen, &error);
if(res == -1) {
// CJH: Compression errors are displayed elsewhere
//ERROR("%s uncompress failed with error code %d\n",
// comp->name, error);
goto failed;
}
} else {
res = read_fs_bytes(fd, start + offset, c_byte, block);
if(res == FALSE)
goto failed;
res = c_byte;
}
if(next)
*next = start + offset + c_byte;
/*
* if expected, then check the (uncompressed) return data
* is of the expected size
*/
if(expected && expected != res)
{
ERROR("Decompressed size did not match the expected size! [%d != %d]\n", res, expected);
return 0;
}
else
return res;
failed:
ERROR("read_block: failed to read block @0x%llx\n", start);
return FALSE;
}
int read_data_block(long long start, unsigned int size, char *block)
{
int error, res;
int c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(size);
TRACE("read_data_block: block @0x%llx, %d %s bytes\n", start,
c_byte, SQUASHFS_COMPRESSED_BLOCK(size) ? "compressed" :
"uncompressed");
if(SQUASHFS_COMPRESSED_BLOCK(size)) {
if(read_fs_bytes(fd, start, c_byte, data) == FALSE)
goto failed;
res = compressor_uncompress(comp, block, data, c_byte,
block_size, &error);
if(res == -1) {
// CJH: Compression errors are displayed elsewhere
//ERROR("%s uncompress failed with error code %d\n",
// comp->name, error);
goto failed;
}
return res;
} else {
if(read_fs_bytes(fd, start, c_byte, block) == FALSE)
goto failed;
return c_byte;
}
failed:
ERROR("read_data_block: failed to read block @0x%llx, size %d\n", start,
c_byte);
return FALSE;
}
int read_inode_table(long long start, long long end)
{
int size = 0, bytes = 0, res;
TRACE("read_inode_table: start %lld, end %lld\n", start, end);
while(start < end) {
if(size - bytes < SQUASHFS_METADATA_SIZE) {
inode_table = realloc(inode_table, size +=
SQUASHFS_METADATA_SIZE);
if(inode_table == NULL) {
ERROR("Out of memory in read_inode_table");
goto failed;
}
}
add_entry(inode_table_hash, start, bytes);
res = read_block(fd, start, &start, 0, inode_table + bytes);
if(res == 0) {
ERROR("read_inode_table: failed to read block\n");
goto failed;
}
bytes += res;
/*
* If this is not the last metadata block in the inode table
* then it should be SQUASHFS_METADATA_SIZE in size.
* Note, we can't use expected in read_block() above for this
* because we don't know if this is the last block until
* after reading.
*/
if(start != end && res != SQUASHFS_METADATA_SIZE) {
ERROR("read_inode_table: metadata block should be %d "
"bytes in length, it is %d bytes\n",
SQUASHFS_METADATA_SIZE, res);
goto failed;
}
}
return TRUE;
failed:
free(inode_table);
return FALSE;
}
int set_attributes(char *pathname, int mode, uid_t uid, gid_t guid, time_t time,
unsigned int xattr, unsigned int set_mode)
{
struct utimbuf times = { time, time };
write_xattr(pathname, xattr);
if(utime(pathname, ×) == -1) {
ERROR("set_attributes: failed to set time on %s, because %s\n",
pathname, strerror(errno));
return FALSE;
}
if(root_process) {
if(chown(pathname, uid, guid) == -1) {
ERROR("set_attributes: failed to change uid and gids "
"on %s, because %s\n", pathname,
strerror(errno));
return FALSE;
}
} else
mode &= ~07000;
if((set_mode || (mode & 07000)) && chmod(pathname, (mode_t) mode) == -1) {
ERROR("set_attributes: failed to change mode %s, because %s\n",
pathname, strerror(errno));
return FALSE;
}
return TRUE;
}
int write_bytes(int fd, char *buff, int bytes)
{
int res, count;
for(count = 0; count < bytes; count += res) {
res = write(fd, buff + count, bytes - count);
if(res == -1) {
if(errno != EINTR) {
ERROR("Write on output file failed because "
"%s\n", strerror(errno));
return -1;
}
res = 0;
}
}
return 0;
}
int lseek_broken = FALSE;
char *zero_data = NULL;
int write_block(int file_fd, char *buffer, int size, long long hole, int sparse)
{
off_t off = hole;
if(hole) {
if(sparse && lseek_broken == FALSE) {
int error = lseek(file_fd, off, SEEK_CUR);
if(error == -1)
/* failed to seek beyond end of file */
lseek_broken = TRUE;
}
if((sparse == FALSE || lseek_broken) && zero_data == NULL) {
if((zero_data = malloc(block_size)) == NULL)
EXIT_UNSQUASH("write_block: failed to alloc "
"zero data block\n");
memset(zero_data, 0, block_size);
}
if(sparse == FALSE || lseek_broken) {
int blocks = (hole + block_size -1) / block_size;
int avail_bytes, i;
for(i = 0; i < blocks; i++, hole -= avail_bytes) {
avail_bytes = hole > block_size ? block_size :
hole;
if(write_bytes(file_fd, zero_data, avail_bytes)
== -1)
goto failure;
}
}
}
if(write_bytes(file_fd, buffer, size) == -1)
goto failure;
return TRUE;
failure:
return FALSE;
}
pthread_mutex_t open_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t open_empty = PTHREAD_COND_INITIALIZER;
int open_unlimited, open_count;
#define OPEN_FILE_MARGIN 10
void open_init(int count)
{
open_count = count;
open_unlimited = count == -1;
}
int open_wait(char *pathname, int flags, mode_t mode)
{
if (!open_unlimited) {
pthread_mutex_lock(&open_mutex);
while (open_count == 0)
pthread_cond_wait(&open_empty, &open_mutex);
open_count --;
pthread_mutex_unlock(&open_mutex);
}
return open(pathname, flags, mode);
}
void close_wake(int fd)
{
close(fd);
if (!open_unlimited) {
pthread_mutex_lock(&open_mutex);
open_count ++;
pthread_cond_signal(&open_empty);
pthread_mutex_unlock(&open_mutex);
}
}
void queue_file(char *pathname, int file_fd, struct inode *inode)
{
struct squashfs_file *file = malloc(sizeof(struct squashfs_file));
if(file == NULL)
EXIT_UNSQUASH("queue_file: unable to malloc file\n");
file->fd = file_fd;
file->file_size = inode->data;
file->mode = inode->mode;
file->gid = inode->gid;
file->uid = inode->uid;
file->time = inode->time;
file->pathname = strdup(pathname);
file->blocks = inode->blocks + (inode->frag_bytes > 0);
file->sparse = inode->sparse;
file->xattr = inode->xattr;
queue_put(to_writer, file);
}
void queue_dir(char *pathname, struct dir *dir)
{
struct squashfs_file *file = malloc(sizeof(struct squashfs_file));
if(file == NULL)
EXIT_UNSQUASH("queue_dir: unable to malloc file\n");
file->fd = -1;
file->mode = dir->mode;
file->gid = dir->guid;
file->uid = dir->uid;
file->time = dir->mtime;
file->pathname = strdup(pathname);
file->xattr = dir->xattr;