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
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
|
/* pngunknown.c - test the read side unknown chunk handling
*
* Last changed in libpng 1.6.22 [May 26, 2016]
* Copyright (c) 2015,2016 Glenn Randers-Pehrson
* Written by John Cunningham Bowler
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* NOTES:
* This is a C program that is intended to be linked against libpng. It
* allows the libpng unknown handling code to be tested by interpreting
* arguments to save or discard combinations of chunks. The program is
* currently just a minimal validation for the built-in libpng facilities.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <setjmp.h>
/* Define the following to use this test against your installed libpng, rather
* than the one being built here:
*/
#ifdef PNG_FREESTANDING_TESTS
# include <png.h>
#else
# include "../../png.h"
#endif
/* 1.6.1 added support for the configure test harness, which uses 77 to indicate
* a skipped test, in earlier versions we need to succeed on a skipped test, so:
*/
#if PNG_LIBPNG_VER >= 10601 && defined(HAVE_CONFIG_H)
# define SKIP 77
#else
# define SKIP 0
#endif
/* Since this program tests the ability to change the unknown chunk handling
* these must be defined:
*/
#if defined(PNG_SET_UNKNOWN_CHUNKS_SUPPORTED) &&\
defined(PNG_STDIO_SUPPORTED) &&\
defined(PNG_READ_SUPPORTED)
/* One of these must be defined to allow us to find out what happened. It is
* still useful to set unknown chunk handling without either of these in order
* to cause *known* chunks to be discarded. This can be a significant
* efficiency gain, but it can't really be tested here.
*/
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED) ||\
defined(PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED)
#if PNG_LIBPNG_VER < 10500
/* This deliberately lacks the PNG_CONST. */
typedef png_byte *png_const_bytep;
/* This is copied from 1.5.1 png.h: */
#define PNG_INTERLACE_ADAM7_PASSES 7
#define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7)
#define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7)
#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
#define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
-1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
#define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
-1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \
(((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
#define PNG_COL_FROM_PASS_COL(xIn, pass) \
(((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
#define PNG_PASS_MASK(pass,off) ( \
((0x110145AFU>>(((7-(off))-(pass))<<2)) & 0xFU) | \
((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U))
#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
#define PNG_COL_IN_INTERLACE_PASS(x, pass) \
((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
/* These are needed too for the default build: */
#define PNG_WRITE_16BIT_SUPPORTED
#define PNG_READ_16BIT_SUPPORTED
/* This comes from pnglibconf.h afer 1.5: */
#define PNG_FP_1 100000
#define PNG_GAMMA_THRESHOLD_FIXED\
((png_fixed_point)(PNG_GAMMA_THRESHOLD * PNG_FP_1))
#endif
#if PNG_LIBPNG_VER < 10600
/* 1.6.0 constifies many APIs. The following exists to allow pngvalid to be
* compiled against earlier versions.
*/
# define png_const_structp png_structp
#endif
#if PNG_LIBPNG_VER < 10700
/* Copied from libpng 1.7.0 png.h */
#define PNG_u2(b1, b2) (((unsigned int)(b1) << 8) + (b2))
#define PNG_U16(b1, b2) ((png_uint_16)PNG_u2(b1, b2))
#define PNG_U32(b1, b2, b3, b4)\
(((png_uint_32)PNG_u2(b1, b2) << 16) + PNG_u2(b3, b4))
/* Constants for known chunk types.
*/
#define png_IDAT PNG_U32( 73, 68, 65, 84)
#define png_IEND PNG_U32( 73, 69, 78, 68)
#define png_IHDR PNG_U32( 73, 72, 68, 82)
#define png_PLTE PNG_U32( 80, 76, 84, 69)
#define png_bKGD PNG_U32( 98, 75, 71, 68)
#define png_cHRM PNG_U32( 99, 72, 82, 77)
#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
#define png_gAMA PNG_U32(103, 65, 77, 65)
#define png_gIFg PNG_U32(103, 73, 70, 103)
#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
#define png_gIFx PNG_U32(103, 73, 70, 120)
#define png_hIST PNG_U32(104, 73, 83, 84)
#define png_iCCP PNG_U32(105, 67, 67, 80)
#define png_iTXt PNG_U32(105, 84, 88, 116)
#define png_oFFs PNG_U32(111, 70, 70, 115)
#define png_pCAL PNG_U32(112, 67, 65, 76)
#define png_pHYs PNG_U32(112, 72, 89, 115)
#define png_sBIT PNG_U32(115, 66, 73, 84)
#define png_sCAL PNG_U32(115, 67, 65, 76)
#define png_sPLT PNG_U32(115, 80, 76, 84)
#define png_sRGB PNG_U32(115, 82, 71, 66)
#define png_sTER PNG_U32(115, 84, 69, 82)
#define png_tEXt PNG_U32(116, 69, 88, 116)
#define png_tIME PNG_U32(116, 73, 77, 69)
#define png_tRNS PNG_U32(116, 82, 78, 83)
#define png_zTXt PNG_U32(122, 84, 88, 116)
/* Test on flag values as defined in the spec (section 5.4): */
#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
#endif /* PNG_LIBPNG_VER < 10700 */
#ifdef __cplusplus
# define this not_the_cpp_this
# define new not_the_cpp_new
# define voidcast(type, value) static_cast<type>(value)
#else
# define voidcast(type, value) (value)
#endif /* __cplusplus */
/* Unused formal parameter errors are removed using the following macro which is
* expected to have no bad effects on performance.
*/
#ifndef UNUSED
# if defined(__GNUC__) || defined(_MSC_VER)
# define UNUSED(param) (void)param;
# else
# define UNUSED(param)
# endif
#endif
/* Types of chunks not known to libpng */
#define png_vpAg PNG_U32(118, 112, 65, 103)
/* Chunk information */
#define PNG_INFO_tEXt 0x10000000U
#define PNG_INFO_iTXt 0x20000000U
#define PNG_INFO_zTXt 0x40000000U
#define PNG_INFO_sTER 0x01000000U
#define PNG_INFO_vpAg 0x02000000U
#define ABSENT 0
#define START 1
#define END 2
static struct
{
char name[5];
png_uint_32 flag;
png_uint_32 tag;
int unknown; /* Chunk not known to libpng */
int all; /* Chunk set by the '-1' option */
int position; /* position in pngtest.png */
int keep; /* unknown handling setting */
} chunk_info[] = {
/* Critical chunks */
{ "IDAT", PNG_INFO_IDAT, png_IDAT, 0, 0, START, 0 }, /* must be [0] */
{ "PLTE", PNG_INFO_PLTE, png_PLTE, 0, 0, ABSENT, 0 },
/* Non-critical chunks that libpng handles */
/* This is a mess but it seems to be the only way to do it - there is no way
* to check for a definition outside a #if.
*/
{ "bKGD", PNG_INFO_bKGD, png_bKGD,
# ifdef PNG_READ_bKGD_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "cHRM", PNG_INFO_cHRM, png_cHRM,
# ifdef PNG_READ_cHRM_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "gAMA", PNG_INFO_gAMA, png_gAMA,
# ifdef PNG_READ_gAMA_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "hIST", PNG_INFO_hIST, png_hIST,
# ifdef PNG_READ_hIST_SUPPORTED
0,
# else
1,
# endif
1, ABSENT, 0 },
{ "iCCP", PNG_INFO_iCCP, png_iCCP,
# ifdef PNG_READ_iCCP_SUPPORTED
0,
# else
1,
# endif
1, ABSENT, 0 },
{ "iTXt", PNG_INFO_iTXt, png_iTXt,
# ifdef PNG_READ_iTXt_SUPPORTED
0,
# else
1,
# endif
1, ABSENT, 0 },
{ "oFFs", PNG_INFO_oFFs, png_oFFs,
# ifdef PNG_READ_oFFs_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "pCAL", PNG_INFO_pCAL, png_pCAL,
# ifdef PNG_READ_pCAL_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "pHYs", PNG_INFO_pHYs, png_pHYs,
# ifdef PNG_READ_pHYs_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "sBIT", PNG_INFO_sBIT, png_sBIT,
# ifdef PNG_READ_sBIT_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "sCAL", PNG_INFO_sCAL, png_sCAL,
# ifdef PNG_READ_sCAL_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "sPLT", PNG_INFO_sPLT, png_sPLT,
# ifdef PNG_READ_sPLT_SUPPORTED
0,
# else
1,
# endif
1, ABSENT, 0 },
{ "sRGB", PNG_INFO_sRGB, png_sRGB,
# ifdef PNG_READ_sRGB_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "tEXt", PNG_INFO_tEXt, png_tEXt,
# ifdef PNG_READ_tEXt_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "tIME", PNG_INFO_tIME, png_tIME,
# ifdef PNG_READ_tIME_SUPPORTED
0,
# else
1,
# endif
1, START, 0 },
{ "tRNS", PNG_INFO_tRNS, png_tRNS,
# ifdef PNG_READ_tRNS_SUPPORTED
0,
# else
1,
# endif
0, ABSENT, 0 },
{ "zTXt", PNG_INFO_zTXt, png_zTXt,
# ifdef PNG_READ_zTXt_SUPPORTED
0,
# else
1,
# endif
1, END, 0 },
/* No libpng handling */
{ "sTER", PNG_INFO_sTER, png_sTER, 1, 1, START, 0 },
{ "vpAg", PNG_INFO_vpAg, png_vpAg, 1, 0, START, 0 },
};
#define NINFO ((int)((sizeof chunk_info)/(sizeof chunk_info[0])))
static void
clear_keep(void)
{
int i = NINFO;
while (--i >= 0)
chunk_info[i].keep = 0;
}
static int
find(const char *name)
{
int i = NINFO;
while (--i >= 0)
{
if (memcmp(chunk_info[i].name, name, 4) == 0)
break;
}
return i;
}
static int
findb(const png_byte *name)
{
int i = NINFO;
while (--i >= 0)
{
if (memcmp(chunk_info[i].name, name, 4) == 0)
break;
}
return i;
}
static int
find_by_flag(png_uint_32 flag)
{
int i = NINFO;
while (--i >= 0) if (chunk_info[i].flag == flag) return i;
fprintf(stderr, "pngunknown: internal error\n");
exit(4);
}
static int
ancillary(const char *name)
{
return PNG_CHUNK_ANCILLARY(PNG_U32(name[0], name[1], name[2], name[3]));
}
#ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
static int
ancillaryb(const png_byte *name)
{
return PNG_CHUNK_ANCILLARY(PNG_U32(name[0], name[1], name[2], name[3]));
}
#endif
/* Type of an error_ptr */
typedef struct
{
jmp_buf error_return;
png_structp png_ptr;
png_infop info_ptr, end_ptr;
png_uint_32 before_IDAT;
png_uint_32 after_IDAT;
int error_count;
int warning_count;
int keep; /* the default value */
const char *program;
const char *file;
const char *test;
} display;
static const char init[] = "initialization";
static const char cmd[] = "command line";
static void
init_display(display *d, const char *program)
{
memset(d, 0, sizeof *d);
d->png_ptr = NULL;
d->info_ptr = d->end_ptr = NULL;
d->error_count = d->warning_count = 0;
d->program = program;
d->file = program;
d->test = init;
}
static void
clean_display(display *d)
{
png_destroy_read_struct(&d->png_ptr, &d->info_ptr, &d->end_ptr);
/* This must not happen - it might cause an app crash */
if (d->png_ptr != NULL || d->info_ptr != NULL || d->end_ptr != NULL)
{
fprintf(stderr, "%s(%s): png_destroy_read_struct error\n", d->file,
d->test);
exit(1);
}
}
PNG_FUNCTION(void, display_exit, (display *d), static PNG_NORETURN)
{
++(d->error_count);
if (d->png_ptr != NULL)
clean_display(d);
/* During initialization and if this is a single command line argument set
* exit now - there is only one test, otherwise longjmp to do the next test.
*/
if (d->test == init || d->test == cmd)
exit(1);
longjmp(d->error_return, 1);
}
static int
display_rc(const display *d, int strict)
{
return d->error_count + (strict ? d->warning_count : 0);
}
/* libpng error and warning callbacks */
PNG_FUNCTION(void, (PNGCBAPI error), (png_structp png_ptr, const char *message),
static PNG_NORETURN)
{
display *d = (display*)png_get_error_ptr(png_ptr);
fprintf(stderr, "%s(%s): libpng error: %s\n", d->file, d->test, message);
display_exit(d);
}
static void PNGCBAPI
warning(png_structp png_ptr, const char *message)
{
display *d = (display*)png_get_error_ptr(png_ptr);
fprintf(stderr, "%s(%s): libpng warning: %s\n", d->file, d->test, message);
++(d->warning_count);
}
static png_uint_32
get_valid(display *d, png_infop info_ptr)
{
png_uint_32 flags = png_get_valid(d->png_ptr, info_ptr, (png_uint_32)~0);
/* Map the text chunks back into the flags */
{
png_textp text;
png_uint_32 ntext = png_get_text(d->png_ptr, info_ptr, &text, NULL);
while (ntext-- > 0) switch (text[ntext].compression)
{
case -1:
flags |= PNG_INFO_tEXt;
break;
case 0:
flags |= PNG_INFO_zTXt;
break;
case 1:
case 2:
flags |= PNG_INFO_iTXt;
break;
default:
fprintf(stderr, "%s(%s): unknown text compression %d\n", d->file,
d->test, text[ntext].compression);
display_exit(d);
}
}
return flags;
}
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
static int PNGCBAPI
read_callback(png_structp pp, png_unknown_chunkp pc)
{
/* This function mimics the behavior of png_set_keep_unknown_chunks by
* returning '0' to keep the chunk and '1' to discard it.
*/
display *d = voidcast(display*, png_get_user_chunk_ptr(pp));
int chunk = findb(pc->name);
int keep, discard;
if (chunk < 0) /* not one in our list, so not a known chunk */
keep = d->keep;
else
{
keep = chunk_info[chunk].keep;
if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
{
/* See the comments in png.h - use the default for unknown chunks,
* do not keep known chunks.
*/
if (chunk_info[chunk].unknown)
keep = d->keep;
else
keep = PNG_HANDLE_CHUNK_NEVER;
}
}
switch (keep)
{
default:
fprintf(stderr, "%s(%s): %d: unrecognized chunk option\n", d->file,
d->test, chunk_info[chunk].keep);
display_exit(d);
case PNG_HANDLE_CHUNK_AS_DEFAULT:
case PNG_HANDLE_CHUNK_NEVER:
discard = 1/*handled; discard*/;
break;
case PNG_HANDLE_CHUNK_IF_SAFE:
case PNG_HANDLE_CHUNK_ALWAYS:
discard = 0/*not handled; keep*/;
break;
}
/* Also store information about this chunk in the display, the relevant flag
* is set if the chunk is to be kept ('not handled'.)
*/
if (chunk >= 0) if (!discard) /* stupidity to stop a GCC warning */
{
png_uint_32 flag = chunk_info[chunk].flag;
if (pc->location & PNG_AFTER_IDAT)
d->after_IDAT |= flag;
else
d->before_IDAT |= flag;
}
/* However if there is no support to store unknown chunks don't ask libpng to
* do it; there will be an png_error.
*/
# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
return discard;
# else
return 1; /*handled; discard*/
# endif
}
#endif /* READ_USER_CHUNKS_SUPPORTED */
#ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
static png_uint_32
get_unknown(display *d, png_infop info_ptr, int after_IDAT)
{
/* Create corresponding 'unknown' flags */
png_uint_32 flags = 0;
UNUSED(after_IDAT)
{
png_unknown_chunkp unknown;
int num_unknown = png_get_unknown_chunks(d->png_ptr, info_ptr, &unknown);
while (--num_unknown >= 0)
{
int chunk = findb(unknown[num_unknown].name);
/* Chunks not known to pngunknown must be validated here; since they
* must also be unknown to libpng the 'display->keep' behavior should
* have been used.
*/
if (chunk < 0) switch (d->keep)
{
default: /* impossible */
case PNG_HANDLE_CHUNK_AS_DEFAULT:
case PNG_HANDLE_CHUNK_NEVER:
fprintf(stderr, "%s(%s): %s: %s: unknown chunk saved\n",
d->file, d->test, d->keep ? "discard" : "default",
unknown[num_unknown].name);
++(d->error_count);
break;
case PNG_HANDLE_CHUNK_IF_SAFE:
if (!ancillaryb(unknown[num_unknown].name))
{
fprintf(stderr,
"%s(%s): if-safe: %s: unknown critical chunk saved\n",
d->file, d->test, unknown[num_unknown].name);
++(d->error_count);
break;
}
/* FALL THROUGH (safe) */
case PNG_HANDLE_CHUNK_ALWAYS:
break;
}
else
flags |= chunk_info[chunk].flag;
}
}
return flags;
}
#else /* SAVE_UNKNOWN_CHUNKS */
static png_uint_32
get_unknown(display *d, png_infop info_ptr, int after_IDAT)
/* Otherwise this will return the cached values set by any user callback */
{
UNUSED(info_ptr);
if (after_IDAT)
return d->after_IDAT;
else
return d->before_IDAT;
}
# ifndef PNG_READ_USER_CHUNKS_SUPPORTED
/* The #defines above should mean this is never reached, it's just here as
* a check to ensure the logic is correct.
*/
# error No store support and no user chunk support, this will not work
# endif /* READ_USER_CHUNKS */
#endif /* SAVE_UNKNOWN_CHUNKS */
static int
check(FILE *fp, int argc, const char **argv, png_uint_32p flags/*out*/,
display *d, int set_callback)
{
int i, npasses, ipass;
png_uint_32 height;
d->keep = PNG_HANDLE_CHUNK_AS_DEFAULT;
d->before_IDAT = 0;
d->after_IDAT = 0;
/* Some of these errors are permanently fatal and cause an exit here, others
* are per-test and cause an error return.
*/
d->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, d, error,
warning);
if (d->png_ptr == NULL)
{
fprintf(stderr, "%s(%s): could not allocate png struct\n", d->file,
d->test);
/* Terminate here, this error is not test specific. */
exit(1);
}
d->info_ptr = png_create_info_struct(d->png_ptr);
d->end_ptr = png_create_info_struct(d->png_ptr);
if (d->info_ptr == NULL || d->end_ptr == NULL)
{
fprintf(stderr, "%s(%s): could not allocate png info\n", d->file,
d->test);
clean_display(d);
exit(1);
}
png_init_io(d->png_ptr, fp);
# ifdef PNG_READ_USER_CHUNKS_SUPPORTED
/* This is only done if requested by the caller; it interferes with the
* standard store/save mechanism.
*/
if (set_callback)
png_set_read_user_chunk_fn(d->png_ptr, d, read_callback);
# else
UNUSED(set_callback)
# endif
/* Handle each argument in turn; multiple settings are possible for the same
* chunk and multiple calls will occur (the last one should override all
* preceding ones).
*/
for (i=0; i<argc; ++i)
{
const char *equals = strchr(argv[i], '=');
if (equals != NULL)
{
int chunk, option;
if (strcmp(equals+1, "default") == 0)
option = PNG_HANDLE_CHUNK_AS_DEFAULT;
else if (strcmp(equals+1, "discard") == 0)
option = PNG_HANDLE_CHUNK_NEVER;
else if (strcmp(equals+1, "if-safe") == 0)
option = PNG_HANDLE_CHUNK_IF_SAFE;
else if (strcmp(equals+1, "save") == 0)
option = PNG_HANDLE_CHUNK_ALWAYS;
else
{
fprintf(stderr, "%s(%s): %s: unrecognized chunk option\n", d->file,
d->test, argv[i]);
display_exit(d);
}
switch (equals - argv[i])
{
case 4: /* chunk name */
chunk = find(argv[i]);
if (chunk >= 0)
{
/* These #if tests have the effect of skipping the arguments
* if SAVE support is unavailable - we can't do a useful test
* in this case, so we just check the arguments! This could
* be improved in the future by using the read callback.
*/
# if PNG_LIBPNG_VER >= 10700 &&\
!defined(PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED)
if (option < PNG_HANDLE_CHUNK_IF_SAFE)
# endif /* 1.7+ SAVE_UNKNOWN_CHUNKS */
{
png_byte name[5];
memcpy(name, chunk_info[chunk].name, 5);
png_set_keep_unknown_chunks(d->png_ptr, option, name, 1);
chunk_info[chunk].keep = option;
}
continue;
}
break;
case 7: /* default */
if (memcmp(argv[i], "default", 7) == 0)
{
# if PNG_LIBPNG_VER >= 10700 &&\
!defined(PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED)
if (option < PNG_HANDLE_CHUNK_IF_SAFE)
# endif /* 1.7+ SAVE_UNKNOWN_CHUNKS */
png_set_keep_unknown_chunks(d->png_ptr, option, NULL, 0);
d->keep = option;
continue;
}
break;
case 3: /* all */
if (memcmp(argv[i], "all", 3) == 0)
{
# if PNG_LIBPNG_VER >= 10700 &&\
!defined(PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED)
if (option < PNG_HANDLE_CHUNK_IF_SAFE)
# endif /* 1.7+ SAVE_UNKNOWN_CHUNKS */
png_set_keep_unknown_chunks(d->png_ptr, option, NULL, -1);
d->keep = option;
for (chunk = 0; chunk < NINFO; ++chunk)
if (chunk_info[chunk].all)
chunk_info[chunk].keep = option;
continue;
}
break;
default: /* some misplaced = */
break;
}
}
fprintf(stderr, "%s(%s): %s: unrecognized chunk argument\n", d->file,
d->test, argv[i]);
display_exit(d);
}
png_read_info(d->png_ptr, d->info_ptr);
switch (png_get_interlace_type(d->png_ptr, d->info_ptr))
{
case PNG_INTERLACE_NONE:
npasses = 1;
break;
case PNG_INTERLACE_ADAM7:
npasses = PNG_INTERLACE_ADAM7_PASSES;
break;
default:
/* Hard error because it is not test specific */
fprintf(stderr, "%s(%s): invalid interlace type\n", d->file, d->test);
clean_display(d);
exit(1);
}
/* Skip the image data, if IDAT is not being handled then don't do this
* because it will cause a CRC error.
*/
if (chunk_info[0/*IDAT*/].keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
{
png_start_read_image(d->png_ptr);
height = png_get_image_height(d->png_ptr, d->info_ptr);
if (npasses > 1)
{
png_uint_32 width = png_get_image_width(d->png_ptr, d->info_ptr);
for (ipass=0; ipass<npasses; ++ipass)
{
png_uint_32 wPass = PNG_PASS_COLS(width, ipass);
if (wPass > 0)
{
png_uint_32 y;
for (y=0; y<height; ++y) if (PNG_ROW_IN_INTERLACE_PASS(y, ipass))
png_read_row(d->png_ptr, NULL, NULL);
}
}
} /* interlaced */
else /* not interlaced */
{
png_uint_32 y;
for (y=0; y<height; ++y)
png_read_row(d->png_ptr, NULL, NULL);
}
}
png_read_end(d->png_ptr, d->end_ptr);
flags[0] = get_valid(d, d->info_ptr);
flags[1] = get_unknown(d, d->info_ptr, 0/*before IDAT*/);
/* Only png_read_png sets PNG_INFO_IDAT! */
flags[chunk_info[0/*IDAT*/].keep != PNG_HANDLE_CHUNK_AS_DEFAULT] |=
PNG_INFO_IDAT;
flags[2] = get_valid(d, d->end_ptr);
flags[3] = get_unknown(d, d->end_ptr, 1/*after IDAT*/);
clean_display(d);
return d->keep;
}
static void
check_error(display *d, png_uint_32 flags, const char *message)
{
while (flags)
{
png_uint_32 flag = flags & -(png_int_32)flags;
int i = find_by_flag(flag);
fprintf(stderr, "%s(%s): chunk %s: %s\n", d->file, d->test,
chunk_info[i].name, message);
++(d->error_count);
flags &= ~flag;
}
}
static void
check_handling(display *d, int def, png_uint_32 chunks, png_uint_32 known,
png_uint_32 unknown, const char *position, int set_callback)
{
while (chunks)
{
png_uint_32 flag = chunks & -(png_int_32)chunks;
int i = find_by_flag(flag);
int keep = chunk_info[i].keep;
const char *type;
const char *errorx = NULL;
if (chunk_info[i].unknown)
{
if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
{
type = "UNKNOWN (default)";
keep = def;
}
else
type = "UNKNOWN (specified)";
if (flag & known)
errorx = "chunk processed";
else switch (keep)
{
case PNG_HANDLE_CHUNK_AS_DEFAULT:
if (flag & unknown)
errorx = "DEFAULT: unknown chunk saved";
break;
case PNG_HANDLE_CHUNK_NEVER:
if (flag & unknown)
errorx = "DISCARD: unknown chunk saved";
break;
case PNG_HANDLE_CHUNK_IF_SAFE:
if (ancillary(chunk_info[i].name))
{
if (!(flag & unknown))
errorx = "IF-SAFE: unknown ancillary chunk lost";
}
else if (flag & unknown)
errorx = "IF-SAFE: unknown critical chunk saved";
break;
case PNG_HANDLE_CHUNK_ALWAYS:
if (!(flag & unknown))
errorx = "SAVE: unknown chunk lost";
break;
default:
errorx = "internal error: bad keep";
break;
}
} /* unknown chunk */
else /* known chunk */
{
type = "KNOWN";
if (flag & known)
{
/* chunk was processed, it won't have been saved because that is
* caught below when checking for inconsistent processing.
*/
if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
errorx = "!DEFAULT: known chunk processed";
}
else /* not processed */ switch (keep)
{
case PNG_HANDLE_CHUNK_AS_DEFAULT:
errorx = "DEFAULT: known chunk not processed";
break;
case PNG_HANDLE_CHUNK_NEVER:
if (flag & unknown)
errorx = "DISCARD: known chunk saved";
break;
case PNG_HANDLE_CHUNK_IF_SAFE:
if (ancillary(chunk_info[i].name))
{
if (!(flag & unknown))
errorx = "IF-SAFE: known ancillary chunk lost";
}
else if (flag & unknown)
errorx = "IF-SAFE: known critical chunk saved";
break;
case PNG_HANDLE_CHUNK_ALWAYS:
if (!(flag & unknown))
errorx = "SAVE: known chunk lost";
break;
default:
errorx = "internal error: bad keep (2)";
break;
}
}
if (errorx != NULL)
{
++(d->error_count);
fprintf(stderr, "%s(%s%s): %s %s %s: %s\n", d->file, d->test,
set_callback ? ",callback" : "",
type, chunk_info[i].name, position, errorx);
}
chunks &= ~flag;
}
}
static void
perform_one_test(FILE *fp, int argc, const char **argv,
png_uint_32 *default_flags, display *d, int set_callback)
{
int def;
png_uint_32 flags[2][4];
rewind(fp);
clear_keep();
memcpy(flags[0], default_flags, sizeof flags[0]);
def = check(fp, argc, argv, flags[1], d, set_callback);
/* If IDAT is being handled as unknown the image read is skipped and all the
* IDATs after the first end up in the end info struct, so in this case add
* IDAT to the list of unknowns. (Do this after 'check' above sets the
* chunk_info 'keep' fields.)
*
* Note that the flag setting has to be in the 'known' field to avoid
* triggering the consistency check below and the flag must only be set if
* there are multiple IDATs, so if the check above did find an unknown IDAT
* after IDAT.
*/
if (chunk_info[0/*IDAT*/].keep != PNG_HANDLE_CHUNK_AS_DEFAULT &&
(flags[1][3] & PNG_INFO_IDAT) != 0)
flags[0][2] |= PNG_INFO_IDAT;
/* Chunks should either be known or unknown, never both and this should apply
* whether the chunk is before or after the IDAT (actually, the app can
* probably change this by swapping the handling after the image, but this
* test does not do that.)
*/
check_error(d, (flags[0][0]|flags[0][2]) & (flags[0][1]|flags[0][3]),
"chunk handled inconsistently in count tests");
check_error(d, (flags[1][0]|flags[1][2]) & (flags[1][1]|flags[1][3]),
"chunk handled inconsistently in option tests");
/* Now find out what happened to each chunk before and after the IDAT and
* determine if the behavior was correct. First some basic sanity checks,
* any known chunk should be known in the original count, any unknown chunk
* should be either known or unknown in the original.
*/
{
png_uint_32 test;
test = flags[1][0] & ~flags[0][0];
check_error(d, test, "new known chunk before IDAT");
test = flags[1][1] & ~(flags[0][0] | flags[0][1]);
check_error(d, test, "new unknown chunk before IDAT");
test = flags[1][2] & ~flags[0][2];
check_error(d, test, "new known chunk after IDAT");
test = flags[1][3] & ~(flags[0][2] | flags[0][3]);
check_error(d, test, "new unknown chunk after IDAT");
}
/* Now each chunk in the original list should have been handled according to
* the options set for that chunk, regardless of whether libpng knows about
* it or not.
*/
check_handling(d, def, flags[0][0] | flags[0][1], flags[1][0], flags[1][1],
"before IDAT", set_callback);
check_handling(d, def, flags[0][2] | flags[0][3], flags[1][2], flags[1][3],
"after IDAT", set_callback);
}
static void
perform_one_test_safe(FILE *fp, int argc, const char **argv,
png_uint_32 *default_flags, display *d, const char *test)
{
if (setjmp(d->error_return) == 0)
{
d->test = test; /* allow use of d->error_return */
# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
perform_one_test(fp, argc, argv, default_flags, d, 0);
# endif
# ifdef PNG_READ_USER_CHUNKS_SUPPORTED
perform_one_test(fp, argc, argv, default_flags, d, 1);
# endif
d->test = init; /* prevent use of d->error_return */
}
}
static const char *standard_tests[] =
{
"discard", "default=discard", 0,
"save", "default=save", 0,
"if-safe", "default=if-safe", 0,
"vpAg", "vpAg=if-safe", 0,
"sTER", "sTER=if-safe", 0,
"IDAT", "default=discard", "IDAT=save", 0,
"sAPI", "bKGD=save", "cHRM=save", "gAMA=save", "all=discard", "iCCP=save",
"sBIT=save", "sRGB=save", 0,
0/*end*/
};
static PNG_NORETURN void
usage(const char *program, const char *reason)
{
fprintf(stderr, "pngunknown: %s: usage:\n %s [--strict] "
"--default|{(CHNK|default|all)=(default|discard|if-safe|save)} "
"testfile.png\n", reason, program);
exit(99);
}
int
main(int argc, const char **argv)
{
FILE *fp;
png_uint_32 default_flags[4/*valid,unknown{before,after}*/];
int strict = 0, default_tests = 0;
const char *count_argv = "default=save";
const char *touch_file = NULL;
display d;
init_display(&d, argv[0]);
while (++argv, --argc > 0)
{
if (strcmp(*argv, "--strict") == 0)
strict = 1;
else if (strcmp(*argv, "--default") == 0)
default_tests = 1;
else if (strcmp(*argv, "--touch") == 0)
{
if (argc > 1)
touch_file = *++argv, --argc;
else
usage(d.program, "--touch: missing file name");
}
else
break;
}
/* A file name is required, but there should be no other arguments if
* --default was specified.
*/
if (argc <= 0)
usage(d.program, "missing test file");
/* GCC BUG: if (default_tests && argc != 1) triggers some weird GCC argc
* optimization which causes warnings with -Wstrict-overflow!
*/
else if (default_tests) if (argc != 1)
usage(d.program, "extra arguments");
/* The name of the test file is the last argument; remove it. */
d.file = argv[--argc];
fp = fopen(d.file, "rb");
if (fp == NULL)
{
perror(d.file);
exit(99);
}
/* First find all the chunks, known and unknown, in the test file, a failure
* here aborts the whole test.
*
* If 'save' is supported then the normal saving method should happen,
* otherwise if 'read' is supported then the read callback will do the
* same thing. If both are supported the 'read' callback won't be
* instantiated by default. If 'save' is *not* supported then a user
* callback is required even though we can call png_get_unknown_chunks.
*/
if (check(fp, 1, &count_argv, default_flags, &d,
# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
0
# else
1
# endif
) != PNG_HANDLE_CHUNK_ALWAYS)
{
fprintf(stderr, "%s: %s: internal error\n", d.program, d.file);
exit(99);
}
/* Now find what the various supplied options cause to change: */
if (!default_tests)
{
d.test = cmd; /* acts as a flag to say exit, do not longjmp */
# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
perform_one_test(fp, argc, argv, default_flags, &d, 0);
# endif
# ifdef PNG_READ_USER_CHUNKS_SUPPORTED
perform_one_test(fp, argc, argv, default_flags, &d, 1);
# endif
d.test = init;
}
else
{
const char **test = standard_tests;
/* Set the exit_test pointer here so we can continue after a libpng error.
* NOTE: this leaks memory because the png_struct data from the failing
* test is never freed.
*/
while (*test)
{
const char *this_test = *test++;
const char **next = test;
int count = display_rc(&d, strict), new_count;
const char *result;
int arg_count = 0;
while (*next) ++next, ++arg_count;
perform_one_test_safe(fp, arg_count, test, default_flags, &d,
this_test);
new_count = display_rc(&d, strict);
if (new_count == count)
result = "PASS";
else
result = "FAIL";
printf("%s: %s %s\n", result, d.program, this_test);
test = next+1;
}
}
fclose(fp);
if (display_rc(&d, strict) == 0)
{
/* Success, touch the success file if appropriate */
if (touch_file != NULL)
{
FILE *fsuccess = fopen(touch_file, "wt");
if (fsuccess != NULL)
{
int err = 0;
fprintf(fsuccess, "PNG unknown tests succeeded\n");
fflush(fsuccess);
err = ferror(fsuccess);
if (fclose(fsuccess) || err)
{
fprintf(stderr, "%s: write failed\n", touch_file);
exit(99);
}
}
else
{
fprintf(stderr, "%s: open failed\n", touch_file);
exit(99);
}
}
return 0;
}
return 1;
}
#else /* !(READ_USER_CHUNKS || SAVE_UNKNOWN_CHUNKS) */
int
main(void)
{
fprintf(stderr,
" test ignored: no support to find out about unknown chunks\n");
/* So the test is skipped: */
return SKIP;
}
#endif /* READ_USER_CHUNKS || SAVE_UNKNOWN_CHUNKS */
#else /* !(SET_UNKNOWN_CHUNKS && READ) */
int
main(void)
{
fprintf(stderr,
" test ignored: no support to modify unknown chunk handling\n");
/* So the test is skipped: */
return SKIP;
}
#endif /* SET_UNKNOWN_CHUNKS && READ*/
|