-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
softmagic.c
1544 lines (1477 loc) · 38.8 KB
/
softmagic.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
/* $OpenBSD: softmagic.c,v 1.16 2010/01/17 20:36:21 chl Exp $ */
/*
* Copyright (c) Ian F. Darwin 1986-1995.
* Software written by Ian F. Darwin and others;
* maintained 1995-present by Christos Zoulas and others.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice immediately at the beginning of the file, without modification,
* this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* softmagic - interpret variable magic from MAGIC
*/
#include <r_userconf.h>
#if !USE_LIB_MAGIC
#include <r_util.h>
#include "file.h"
#include "r_regex.h"
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "r_util/r_time.h"
static int match(RMagic *, struct r_magic *, ut32, const ut8 *, size_t, int);
static int mget(RMagic *, const ut8 *, struct r_magic *, size_t, unsigned int);
static int magiccheck(RMagic *, struct r_magic *);
static st32 mprint(RMagic *, struct r_magic *);
static void mdebug(ut32, const char *, size_t);
static int mcopy(RMagic *, union VALUETYPE *, int, int, const ut8 *, ut32, size_t, size_t);
static int mconvert(RMagic *, struct r_magic *);
static int print_sep(RMagic *, int);
static void cvt_8(union VALUETYPE *, const struct r_magic *);
static void cvt_16(union VALUETYPE *, const struct r_magic *);
static void cvt_32(union VALUETYPE *, const struct r_magic *);
static void cvt_64(union VALUETYPE *, const struct r_magic *);
/*
* Macro to give description string according to whether we want plain
* text or MIME type
*/
#define R_MAGIC_DESC ((ms->flags & R_MAGIC_MIME) ? m->mimetype : m->desc)
/*
* softmagic - lookup one file in parsed, in-memory copy of database
* Passed the name and FILE * of one file to be typed.
*/
/*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */
int __magic_file_softmagic(RMagic *ms, const ut8 *buf, size_t nbytes, int mode) {
struct mlist *ml;
int rv;
for (ml = ms->mlist->next; ml != ms->mlist; ml = ml->next) {
if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, mode)) != 0) {
return rv;
}
}
return 0;
}
/*
* Go through the whole list, stopping if you find a match. Process all
* the continuations of that match before returning.
*
* We support multi-level continuations:
*
* At any time when processing a successful top-level match, there is a
* current continuation level; it represents the level of the last
* successfully matched continuation.
*
* Continuations above that level are skipped as, if we see one, it
* means that the continuation that controls them - i.e, the
* lower-level continuation preceding them - failed to match.
*
* Continuations below that level are processed as, if we see one,
* it means we've finished processing or skipping higher-level
* continuations under the control of a successful or unsuccessful
* lower-level continuation, and are now seeing the next lower-level
* continuation and should process it. The current continuation
* level reverts to the level of the one we're seeing.
*
* Continuations at the current level are processed as, if we see
* one, there's no lower-level continuation that may have failed.
*
* If a continuation matches, we bump the current continuation level
* so that higher-level continuations are processed.
*/
static int match(RMagic *ms, struct r_magic *magic, ut32 nmagic, const ut8 *s, size_t nbytes, int mode) {
ut32 magindex = 0;
unsigned int cont_level = 0;
int need_separator = 0;
int returnval = 0; /* if a match is found it is set to 1*/
int firstline = 1; /* a flag to print X\n X\n- X */
int printed_something = 0;
if (__magic_file_check_mem (ms, cont_level) == -1) {
return -1;
}
for (magindex = 0; magindex < nmagic; magindex++) {
int flush;
struct r_magic *m = &magic[magindex];
if ((m->flag & BINTEST) != mode) {
/* Skip sub-tests */
while (magic[magindex + 1].cont_level != 0 && ++magindex < nmagic - 1) {
continue;
}
continue; /* Skip to next top-level test*/
}
ms->offset = m->offset;
ms->line = m->lineno;
/* if main entry matches, print it... */
flush = !mget(ms, s, m, nbytes, cont_level);
if (flush) {
if (m->reln == '!') {
flush = 0;
}
} else {
int ret = magiccheck (ms, m);
if (ret == -1) {
return -1;
}
if (!ret) {
flush++;
}
}
if (flush) {
/*
* main entry didn't match,
* flush its continuations
*/
while (magindex < nmagic - 1 && magic[magindex + 1].cont_level) {
magindex++;
}
continue;
}
/*
* If we are going to print something, we'll need to print
* a blank before we print something else.
*/
if (*R_MAGIC_DESC) {
need_separator = 1;
printed_something = 1;
if (print_sep (ms, firstline) == -1) {
return -1;
}
}
if ((ms->c.li[cont_level].off = mprint (ms, m)) == -1) {
return -1;
}
/* and any continuations that match */
if (__magic_file_check_mem(ms, ++cont_level) == -1) {
return -1;
}
while (++magindex < nmagic - 1 && magic[magindex].cont_level != 0) {
m = &magic[magindex];
ms->line = m->lineno; /* for messages */
if (cont_level < m->cont_level) {
continue;
}
if (cont_level > m->cont_level) {
/*
* We're at the end of the level
* "cont_level" continuations.
*/
cont_level = m->cont_level;
}
ms->offset = m->offset;
if (m->flag & OFFADD) {
ms->offset += ms->c.li[cont_level - 1].off;
}
if (m->cond == COND_ELSE || m->cond == COND_ELIF) {
if (ms->c.li[cont_level].last_match == 1) {
continue;
}
}
flush = !mget(ms, s, m, nbytes, cont_level);
if (flush && m->reln != '!') {
continue;
}
switch (flush ? 1 : magiccheck(ms, m)) {
case -1:
return -1;
case 0:
ms->c.li[cont_level].last_match = 0;
break;
default:
ms->c.li[cont_level].last_match = 1;
if (m->type != FILE_DEFAULT) {
ms->c.li[cont_level].got_match = 1;
} else if (ms->c.li[cont_level].got_match) {
ms->c.li[cont_level].got_match = 0;
break;
}
/*
* If we are going to print something,
* make sure that we have a separator first.
*/
if (*R_MAGIC_DESC) {
printed_something = 1;
if (print_sep (ms, firstline) == -1) {
return -1;
}
}
/*
* This continuation matched. Print
* its message, with a blank before it
* if the previous item printed and
* this item isn't empty.
*/
/* space if previous printed */
if (need_separator
&& ((m->flag & NOSPACE) == 0)
&& *R_MAGIC_DESC) {
if (__magic_file_printf (ms, " ") == -1) {
return -1;
}
need_separator = 0;
}
if ((ms->c.li[cont_level].off = mprint (ms, m)) == -1) {
return -1;
}
if (*R_MAGIC_DESC) {
need_separator = 1;
}
/*
* If we see any continuations
* at a higher level,
* process them.
*/
if (__magic_file_check_mem (ms, ++cont_level) == -1) {
return -1;
}
break;
}
}
if (printed_something) {
firstline = 0;
returnval = 1;
}
if ((ms->flags & R_MAGIC_CONTINUE) == 0 && printed_something) {
return 1; /* don't keep searching */
}
}
return returnval; /* This is hit if -k is set or there is no match */
}
static int check_fmt(RMagic *ms, struct r_magic *m) {
RRegex rx;
int rc;
if (!strchr (R_MAGIC_DESC, '%')) {
return 0;
}
rc = r_regex_init (&rx, "%[-0-9\\.]*s", R_REGEX_EXTENDED|R_REGEX_NOSUB);
if (rc) {
char *errmsg = r_regex_error (&rx, rc);
__magic_file_magerror (ms, "regex error %d, (%s)", rc, errmsg);
free (errmsg);
return -1;
} else {
rc = r_regex_exec (&rx, R_MAGIC_DESC, 0, 0, 0);
r_regex_fini (&rx);
return !rc;
}
}
char * strdupn(const char *str, size_t n) {
size_t len;
char *copy;
for (len = 0; len < n && str[len]; len++) {}
if (!(copy = malloc (len + 1))) {
return NULL;
}
(void)memcpy (copy, str, len);
copy[len] = '\0';
return copy;
}
static st32 mprint(RMagic *ms, struct r_magic *m) {
ut64 v;
float vf;
double vd;
ut64 t = 0;
char *buf = NULL;
union VALUETYPE *p = &ms->ms_value;
char pp[ASCTIME_BUF_MAXLEN];
switch (m->type) {
case FILE_BYTE:
v = __magic_file_signextend(ms, m, (ut64)p->b);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (2);
if (snprintf (buf, 2, "%c", (ut8)v)<0) {
free (buf);
return -1;
}
if (__magic_file_printf (ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (__magic_file_printf (ms, R_MAGIC_DESC, (ut8)v) == -1) {
return -1;
}
break;
}
t = ms->offset + sizeof (char);
break;
case FILE_SHORT:
case FILE_BESHORT:
case FILE_LESHORT:
v = __magic_file_signextend (ms, m, (ut64)p->h);
switch (check_fmt (ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%hu", (unsigned short)v) < 0) {
free (buf);
return -1;
}
if (__magic_file_printf(ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (__magic_file_printf (ms, R_MAGIC_DESC, (unsigned short)v) == -1) {
return -1;
}
break;
}
t = ms->offset + sizeof (short);
break;
case FILE_LONG:
case FILE_BELONG:
case FILE_LELONG:
case FILE_MELONG:
v = __magic_file_signextend(ms, m, (ut64)p->l);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%u", (ut32)v) < 0) {
free (buf);
return -1;
}
if (__magic_file_printf(ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (__magic_file_printf (ms, R_MAGIC_DESC, (ut32)v) == -1) {
return -1;
}
break;
}
t = ms->offset + sizeof (st32);
break;
case FILE_QUAD:
case FILE_BEQUAD:
case FILE_LEQUAD:
v = __magic_file_signextend(ms, m, p->q);
if (__magic_file_printf (ms, R_MAGIC_DESC, (ut64)v) == -1) {
return -1;
}
t = ms->offset + sizeof (ut64);
break;
case FILE_STRING:
case FILE_PSTRING:
case FILE_BESTRING16:
case FILE_LESTRING16:
if (m->reln == '=' || m->reln == '!') {
if (__magic_file_printf (ms, R_MAGIC_DESC, m->value.s) == -1) {
return -1;
}
t = ms->offset + m->vallen;
}
else {
if (*m->value.s == '\0') {
p->s[strcspn (p->s, "\n")] = '\0';
}
if (__magic_file_printf (ms, R_MAGIC_DESC, p->s) == -1) {
return -1;
}
t = ms->offset + strlen (p->s);
if (m->type == FILE_PSTRING) {
t++;
}
}
break;
case FILE_DATE:
case FILE_BEDATE:
case FILE_LEDATE:
case FILE_MEDATE:
if (__magic_file_printf (ms, R_MAGIC_DESC, __magic_file_fmttime (p->l, 1, pp)) == -1) {
return -1;
}
t = ms->offset + sizeof (time_t);
break;
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MELDATE:
if (__magic_file_printf (ms, R_MAGIC_DESC, __magic_file_fmttime (p->l, 0, pp)) == -1) {
return -1;
}
t = ms->offset + sizeof (time_t);
break;
case FILE_QDATE:
case FILE_BEQDATE:
case FILE_LEQDATE:
if (__magic_file_printf (ms, R_MAGIC_DESC, __magic_file_fmttime ((ut32)p->q, 1, pp)) == -1) {
return -1;
}
t = ms->offset + sizeof (ut64);
break;
case FILE_QLDATE:
case FILE_BEQLDATE:
case FILE_LEQLDATE:
if (__magic_file_printf (ms, R_MAGIC_DESC, __magic_file_fmttime ((ut32)p->q, 0, pp)) == -1) {
return -1;
}
t = ms->offset + sizeof (ut64);
break;
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
vf = p->f;
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%g", vf) < 0) {
free (buf);
return -1;
}
if (__magic_file_printf (ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (__magic_file_printf (ms, R_MAGIC_DESC, vf) == -1) {
return -1;
}
break;
}
t = ms->offset + sizeof (float);
break;
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
vd = p->d;
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%g", vd) < 0) {
free (buf);
return -1;
}
if (__magic_file_printf (ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (__magic_file_printf (ms, R_MAGIC_DESC, vd) == -1) {
return -1;
}
break;
}
t = ms->offset + sizeof (double);
break;
case FILE_REGEX: {
char *cp = r_str_ndup ((const char *)ms->search.s, ms->search.rm_len);
if (!cp) {
__magic_file_oomem(ms, ms->search.rm_len);
return -1;
}
int rval = __magic_file_printf(ms, R_MAGIC_DESC, cp);
free (cp);
if (rval == -1) {
return -1;
}
if ((m->str_flags & REGEX_OFFSET_START)) {
t = ms->search.offset;
} else {
t = ms->search.offset + ms->search.rm_len;
}
break;
}
case FILE_SEARCH:
if (__magic_file_printf (ms, R_MAGIC_DESC, m->value.s) == -1) {
return -1;
}
if ((m->str_flags & REGEX_OFFSET_START)) {
t = ms->search.offset;
} else {
t = ms->search.offset + m->vallen;
}
break;
case FILE_DEFAULT:
if (__magic_file_printf (ms, R_MAGIC_DESC, m->value.s) == -1) {
return -1;
}
t = ms->offset;
break;
default:
__magic_file_magerror(ms, "invalid m->type (%d) in mprint()", m->type);
return -1;
}
free (buf);
return t;
}
#define DO_CVT(fld, cast) \
if (m->num_mask) \
switch (m->mask_op & FILE_OPS_MASK) { \
case FILE_OPAND: \
p->fld &= cast m->num_mask; \
break; \
case FILE_OPOR: \
p->fld |= cast m->num_mask; \
break; \
case FILE_OPXOR: \
p->fld ^= cast m->num_mask; \
break; \
case FILE_OPADD: \
p->fld += cast m->num_mask; \
break; \
case FILE_OPMINUS: \
p->fld -= cast m->num_mask; \
break; \
case FILE_OPMULTIPLY: \
p->fld *= cast m->num_mask; \
break; \
case FILE_OPDIVIDE: \
p->fld /= cast m->num_mask; \
break; \
case FILE_OPMODULO: \
p->fld %= cast m->num_mask; \
break; \
} \
if (m->mask_op & FILE_OPINVERSE) \
p->fld = ~p->fld \
static void cvt_8(union VALUETYPE *p, const struct r_magic *m) {
DO_CVT (b, (ut8));
}
static void cvt_16(union VALUETYPE *p, const struct r_magic *m) {
DO_CVT (h, (ut16));
}
static void cvt_32(union VALUETYPE *p, const struct r_magic *m) {
DO_CVT (l, (ut32));
}
static void cvt_64(union VALUETYPE *p, const struct r_magic *m) {
DO_CVT (q, (ut64));
}
#define DO_CVT2(fld, cast) \
if (m->num_mask) \
switch (m->mask_op & FILE_OPS_MASK) { \
case FILE_OPADD: \
p->fld += cast m->num_mask; \
break; \
case FILE_OPMINUS: \
p->fld -= cast m->num_mask; \
break; \
case FILE_OPMULTIPLY: \
p->fld *= cast m->num_mask; \
break; \
case FILE_OPDIVIDE: \
p->fld /= cast m->num_mask; \
break; \
} \
static void cvt_float(union VALUETYPE *p, const struct r_magic *m) {
DO_CVT2 (f, (float));
}
static void cvt_double(union VALUETYPE *p, const struct r_magic *m) {
DO_CVT2 (d, (double));
}
/*
* Convert the byte order of the data we are looking at
* While we're here, let's apply the mask operation
* (unless you have a better idea)
*/
static int mconvert(RMagic *ms, struct r_magic *m) {
union VALUETYPE *p = &ms->ms_value;
switch (m->type) {
case FILE_BYTE:
cvt_8(p, m);
return 1;
case FILE_SHORT:
cvt_16(p, m);
return 1;
case FILE_LONG:
case FILE_DATE:
case FILE_LDATE:
cvt_32(p, m);
return 1;
case FILE_QUAD:
case FILE_QDATE:
case FILE_QLDATE:
cvt_64(p, m);
return 1;
case FILE_STRING:
case FILE_BESTRING16:
case FILE_LESTRING16: {
size_t len;
/* Null terminate and eat *trailing* return */
p->s[sizeof (p->s) - 1] = '\0';
len = strlen(p->s);
if (len-- && p->s[len] == '\n') {
p->s[len] = '\0';
}
return 1;
}
case FILE_PSTRING: {
char *ptr1 = p->s, *ptr2 = ptr1 + 1;
size_t len = *p->s;
if (len >= sizeof (p->s)) {
len = sizeof (p->s) - 1;
}
while (len--) {
*ptr1++ = *ptr2++;
}
*ptr1 = '\0';
len = strlen(p->s);
if (len-- && p->s[len] == '\n') {
p->s[len] = '\0';
}
return 1;
}
case FILE_BESHORT:
p->h = (short)((p->hs[0]<<8)|(p->hs[1]));
cvt_16(p, m);
return 1;
case FILE_BELONG:
case FILE_BEDATE:
case FILE_BELDATE:
p->l = (st32) r_read_be32 (p->hl);
cvt_32(p, m);
return 1;
case FILE_BEQUAD:
case FILE_BEQDATE:
case FILE_BEQLDATE:
p->q = (ut64)
(((ut64)p->hq[0]<<56)|((ut64)p->hq[1]<<48)|
((ut64)p->hq[2]<<40)|((ut64)p->hq[3]<<32)|
((ut64)p->hq[4]<<24)|((ut64)p->hq[5]<<16)|
((ut64)p->hq[6]<<8)|((ut64)p->hq[7]));
cvt_64(p, m);
return 1;
case FILE_LESHORT:
p->h = (short)((p->hs[1]<<8)|(p->hs[0]));
cvt_16(p, m);
return 1;
case FILE_LELONG:
case FILE_LEDATE:
case FILE_LELDATE:
p->l = (st32) r_read_le32 (p->hl);
cvt_32(p, m);
return 1;
case FILE_LEQUAD:
case FILE_LEQDATE:
case FILE_LEQLDATE:
p->q = (ut64)
(((ut64)p->hq[7]<<56)|((ut64)p->hq[6]<<48)|
((ut64)p->hq[5]<<40)|((ut64)p->hq[4]<<32)|
((ut64)p->hq[3]<<24)|((ut64)p->hq[2]<<16)|
((ut64)p->hq[1]<<8)|((ut64)p->hq[0]));
cvt_64(p, m);
return 1;
case FILE_MELONG:
case FILE_MEDATE:
case FILE_MELDATE:
p->l = (st32)
((p->hl[1]<<24)|(p->hl[0]<<16)|(p->hl[3]<<8)|(p->hl[2]));
cvt_32(p, m);
return 1;
case FILE_FLOAT:
cvt_float(p, m);
return 1;
case FILE_BEFLOAT:
p->l = ((ut32)p->hl[0]<<24)|((ut32)p->hl[1]<<16)|
((ut32)p->hl[2]<<8) |((ut32)p->hl[3]);
cvt_float(p, m);
return 1;
case FILE_LEFLOAT:
p->l = ((ut32)p->hl[3]<<24)|((ut32)p->hl[2]<<16)|
((ut32)p->hl[1]<<8) |((ut32)p->hl[0]);
cvt_float(p, m);
return 1;
case FILE_DOUBLE:
cvt_double(p, m);
return 1;
case FILE_BEDOUBLE:
p->q = ((ut64)p->hq[0]<<56)|((ut64)p->hq[1]<<48)|
((ut64)p->hq[2]<<40)|((ut64)p->hq[3]<<32)|
((ut64)p->hq[4]<<24)|((ut64)p->hq[5]<<16)|
((ut64)p->hq[6]<<8) |((ut64)p->hq[7]);
cvt_double(p, m);
return 1;
case FILE_LEDOUBLE:
p->q = ((ut64)p->hq[7]<<56)|((ut64)p->hq[6]<<48)|
((ut64)p->hq[5]<<40)|((ut64)p->hq[4]<<32)|
((ut64)p->hq[3]<<24)|((ut64)p->hq[2]<<16)|
((ut64)p->hq[1]<<8) |((ut64)p->hq[0]);
cvt_double(p, m);
return 1;
case FILE_REGEX:
case FILE_SEARCH:
case FILE_DEFAULT:
return 1;
default:
__magic_file_magerror(ms, "invalid type %d in mconvert()", m->type);
return 0;
}
}
static void mdebug(ut32 offset, const char *str, size_t len) {
eprintf ("mget @%d: ", offset);
__magic_file_showstr (stderr, str, len);
(void) fputc('\n', stderr);
(void) fputc('\n', stderr);
}
static int mcopy(RMagic *ms, union VALUETYPE *p, int type, int indir, const ut8 *s, ut32 offset, size_t nbytes, size_t linecnt) {
/*
* Note: FILE_SEARCH and FILE_REGEX do not actually copy
* anything, but setup pointers into the source
*/
if (indir == 0) {
switch (type) {
case FILE_SEARCH:
ms->search.s = (const char *)s + offset;
ms->search.s_len = nbytes - offset;
ms->search.offset = offset;
return 0;
case FILE_REGEX: {
const char *b;
const char *c;
const char *last; /* end of search region */
const char *buf; /* start of search region */
size_t lines;
if (!s) {
ms->search.s_len = 0;
ms->search.s = NULL;
return 0;
}
buf = (const char *)s + offset;
last = (const char *)s + nbytes;
/* mget() guarantees buf <= last */
for (lines = linecnt, b = buf;
lines && ((b = strchr(c = b, '\n')) || (b = strchr(c, '\r')));
lines--, b++) {
last = b;
if (b[0] == '\r' && b[1] == '\n') {
b++;
}
}
if (lines) {
last = (const char *)s + nbytes;
}
ms->search.s = buf;
ms->search.s_len = last - buf;
ms->search.offset = offset;
ms->search.rm_len = 0;
return 0;
}
case FILE_BESTRING16:
case FILE_LESTRING16: {
const ut8 *src = s + offset;
const ut8 *esrc = s + nbytes;
char *dst = p->s;
char *edst = &p->s[sizeof (p->s) - 1];
if (type == FILE_BESTRING16) {
src++;
}
/* check for pointer overflow */
if (src < s) {
__magic_file_magerror(ms, "invalid offset %u in mcopy()",
offset);
return -1;
}
for (/*EMPTY*/; src < esrc; src += 2, dst++) {
if (dst < edst) {
*dst = *src;
} else {
break;
}
if (*dst == '\0') {
if (type == FILE_BESTRING16 ? *(src - 1) != '\0' : *(src + 1) != '\0') {
*dst = ' ';
}
}
}
*edst = '\0';
return 0;
}
case FILE_STRING: /* XXX - these two should not need */
case FILE_PSTRING: /* to copy anything, but do anyway. */
default:
break;
}
}
if (offset >= nbytes) {
(void)memset(p, '\0', sizeof (*p));
return 0;
}
nbytes = (nbytes - offset < sizeof (*p))?
nbytes - offset: sizeof (*p);
(void)memcpy(p, s + offset, nbytes);
/*
* the usefulness of padding with zeroes eludes me, it
* might even cause problems
*/
if (nbytes < sizeof (*p)) {
(void)memset (((char *)(void *)p) + nbytes, '\0',
sizeof (*p) - nbytes);
}
return 0;
}
static int mget(RMagic *ms, const ut8 *s, struct r_magic *m, size_t nbytes, unsigned int cont_level) {
ut32 offset = ms->offset;
ut32 count = m->str_range;
union VALUETYPE *p = &ms->ms_value;
if (mcopy (ms, p, m->type, m->flag & INDIR, s, offset, nbytes, count) == -1) {
return -1;
}
if ((ms->flags & R_MAGIC_DEBUG) != 0) {
mdebug (offset, (char *)(void *)p, sizeof (union VALUETYPE));
__magic_file_mdump (ms, m);
}
if (m->flag & INDIR) {
int off = m->in_offset;
if (m->in_op & FILE_OPINDIRECT) {
const union VALUETYPE *q =
((const void *)(s + offset + off));
switch (m->in_type) {
case FILE_BYTE:
off = q->b;
break;
case FILE_SHORT:
off = q->h;
break;
case FILE_BESHORT:
off = (short)((q->hs[0]<<8)|(q->hs[1]));
break;
case FILE_LESHORT:
off = (short)((q->hs[1]<<8)|(q->hs[0]));
break;
case FILE_LONG:
off = q->l;
break;
case FILE_BELONG:
off = (st32)((q->hl[0]<<24)|(q->hl[1]<<16)| (q->hl[2]<<8)|(q->hl[3]));
break;
case FILE_LELONG:
off = (st32)((q->hl[3]<<24)|(q->hl[2]<<16)| (q->hl[1]<<8)|(q->hl[0]));
break;
case FILE_MELONG:
off = (st32)((q->hl[1]<<24)|(q->hl[0]<<16)| (q->hl[3]<<8)|(q->hl[2]));
break;
}
}
switch (m->in_type) {
case FILE_BYTE:
if (nbytes < (offset + 1)) {
return 0;
}
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
case FILE_OPAND: offset = p->b & off; break;
case FILE_OPOR: offset = p->b | off; break;
case FILE_OPXOR: offset = p->b ^ off; break;
case FILE_OPADD: offset = p->b + off; break;
case FILE_OPMINUS: offset = p->b - off; break;
case FILE_OPMULTIPLY: offset = p->b * off; break;
case FILE_OPDIVIDE: offset = p->b / off; break;
case FILE_OPMODULO: offset = p->b % off; break;
}
} else {
offset = p->b;
}
if (m->in_op & FILE_OPINVERSE) {
offset = ~offset;
}
break;
case FILE_BESHORT:
if (nbytes < (offset + 2)) {
return 0;
}
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
case FILE_OPAND: offset = (short)((p->hs[0]<<8)| (p->hs[1])) & off; break;
case FILE_OPOR: offset = (short)((p->hs[0]<<8)| (p->hs[1])) | off; break;
case FILE_OPXOR: offset = (short)((p->hs[0]<<8)| (p->hs[1])) ^ off; break;
case FILE_OPADD: offset = (short)((p->hs[0]<<8)| (p->hs[1])) + off; break;
case FILE_OPMINUS: offset = (short)((p->hs[0]<<8)| (p->hs[1])) - off; break;
case FILE_OPMULTIPLY: offset = (short)((p->hs[0]<<8)| (p->hs[1])) * off; break;
case FILE_OPDIVIDE: offset = (short)((p->hs[0]<<8)| (p->hs[1])) / off; break;
case FILE_OPMODULO: offset = (short)((p->hs[0]<<8)| (p->hs[1])) % off; break;
}
} else {
offset = (short)((p->hs[0] << 8) |
(p->hs[1]));
}
if (m->in_op & FILE_OPINVERSE) {
offset = ~offset;
}
break;
case FILE_LESHORT:
if (nbytes < (offset + 2)) {
return 0;
}
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
case FILE_OPAND: offset = (short)((p->hs[1]<<8)| (p->hs[0])) & off; break;
case FILE_OPOR: offset = (short)((p->hs[1]<<8)| (p->hs[0])) | off; break;
case FILE_OPXOR: offset = (short)((p->hs[1]<<8)| (p->hs[0])) ^ off; break;
case FILE_OPADD: offset = (short)((p->hs[1]<<8)| (p->hs[0])) + off; break;
case FILE_OPMINUS: offset = (short)((p->hs[1]<<8)| (p->hs[0])) - off; break;
case FILE_OPMULTIPLY: offset = (short)((p->hs[1]<<8)| (p->hs[0])) * off; break;
case FILE_OPDIVIDE: offset = (short)((p->hs[1]<<8)| (p->hs[0])) / off; break;
case FILE_OPMODULO: offset = (short)((p->hs[1]<<8)| (p->hs[0])) % off; break;
}
} else {
offset = (short)((p->hs[1] << 8) | (p->hs[0]));
}
if (m->in_op & FILE_OPINVERSE) {
offset = ~offset;
}
break;
case FILE_SHORT:
if (nbytes < (offset + 2)) {
return 0;