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source: vbox/trunk/src/libs/libpng-1.6.36/contrib/libtests/pngimage.c@ 77436

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1/* pngimage.c
2 *
3 * Copyright (c) 2015,2016 John Cunningham Bowler
4 *
5 * Last changed in libpng 1.6.24 [August 4, 2016]
6 *
7 * This code is released under the libpng license.
8 * For conditions of distribution and use, see the disclaimer
9 * and license in png.h
10 *
11 * Test the png_read_png and png_write_png interfaces. Given a PNG file load it
12 * using png_read_png and then write with png_write_png. Test all possible
13 * transforms.
14 */
15#include <stdarg.h>
16#include <stdlib.h>
17#include <string.h>
18#include <errno.h>
19#include <stdio.h>
20#include <assert.h>
21
22#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
23# include <config.h>
24#endif
25
26/* Define the following to use this test against your installed libpng, rather
27 * than the one being built here:
28 */
29#ifdef PNG_FREESTANDING_TESTS
30# include <png.h>
31#else
32# include "../../png.h"
33#endif
34
35#ifndef PNG_SETJMP_SUPPORTED
36# include <setjmp.h> /* because png.h did *not* include this */
37#endif
38
39/* 1.6.1 added support for the configure test harness, which uses 77 to indicate
40 * a skipped test, in earlier versions we need to succeed on a skipped test, so:
41 */
42#if PNG_LIBPNG_VER >= 10601 && defined(HAVE_CONFIG_H)
43# define SKIP 77
44#else
45# define SKIP 0
46#endif
47
48#if PNG_LIBPNG_VER < 10700
49 /* READ_PNG and WRITE_PNG were not defined, so: */
50# ifdef PNG_INFO_IMAGE_SUPPORTED
51# ifdef PNG_SEQUENTIAL_READ_SUPPORTED
52# define PNG_READ_PNG_SUPPORTED
53# endif /* SEQUENTIAL_READ */
54# ifdef PNG_WRITE_SUPPORTED
55# define PNG_WRITE_PNG_SUPPORTED
56# endif /* WRITE */
57# endif /* INFO_IMAGE */
58#endif /* pre 1.7.0 */
59
60#ifdef PNG_READ_PNG_SUPPORTED
61/* If a transform is valid on both read and write this implies that if the
62 * transform is applied to read it must also be applied on write to produce
63 * meaningful data. This is because these transforms when performed on read
64 * produce data with a memory format that does not correspond to a PNG format.
65 *
66 * Most of these transforms are invertible; after applying the transform on
67 * write the result is the original PNG data that would have would have been
68 * read if no transform were applied.
69 *
70 * The exception is _SHIFT, which destroys the low order bits marked as not
71 * significant in a PNG with the sBIT chunk.
72 *
73 * The following table lists, for each transform, the conditions under which it
74 * is expected to do anything. Conditions are defined as follows:
75 *
76 * 1) Color mask bits required - simply a mask to AND with color_type; one of
77 * these must be present for the transform to fire, except that 0 means
78 * 'always'.
79 * 2) Color mask bits which must be absent - another mask - none of these must
80 * be present.
81 * 3) Bit depths - a mask of component bit depths for the transform to fire.
82 * 4) 'read' - the transform works in png_read_png.
83 * 5) 'write' - the transform works in png_write_png.
84 * 6) PNG_INFO_chunk; a mask of the chunks that must be present for the
85 * transform to fire. All must be present - the requirement is that
86 * png_get_valid() & mask == mask, so if mask is 0 there is no requirement.
87 *
88 * The condition refers to the original image state - if multiple transforms are
89 * used together it is possible to cause a transform that wouldn't fire on the
90 * original image to fire.
91 */
92static struct transform_info
93{
94 const char *name;
95 int transform;
96 png_uint_32 valid_chunks;
97# define CHUNK_NONE 0
98# define CHUNK_sBIT PNG_INFO_sBIT
99# define CHUNK_tRNS PNG_INFO_tRNS
100 png_byte color_mask_required;
101 png_byte color_mask_absent;
102# define COLOR_MASK_X 0
103# define COLOR_MASK_P PNG_COLOR_MASK_PALETTE
104# define COLOR_MASK_C PNG_COLOR_MASK_COLOR
105# define COLOR_MASK_A PNG_COLOR_MASK_ALPHA
106# define COLOR_MASK_ALL (PALETTE+COLOR+ALPHA) /* absent = gray, no alpha */
107 png_byte bit_depths;
108# define BD_ALL (1 + 2 + 4 + 8 + 16)
109# define BD_PAL (1 + 2 + 4 + 8)
110# define BD_LOW (1 + 2 + 4)
111# define BD_16 16
112# define BD_TRUE (8+16) /* i.e. true-color depths */
113 png_byte when;
114# define TRANSFORM_R 1
115# define TRANSFORM_W 2
116# define TRANSFORM_RW 3
117 png_byte tested; /* the transform was tested somewhere */
118} transform_info[] =
119{
120 /* List ALL the PNG_TRANSFORM_ macros here. Check for support using the READ
121 * macros; even if the transform is supported on write it cannot be tested
122 * without the read support.
123 */
124# define T(name,chunk,cm_required,cm_absent,bd,when)\
125 { #name, PNG_TRANSFORM_ ## name, CHUNK_ ## chunk,\
126 COLOR_MASK_ ## cm_required, COLOR_MASK_ ## cm_absent, BD_ ## bd,\
127 TRANSFORM_ ## when, 0/*!tested*/ }
128
129#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
130 T(STRIP_16, NONE, X, X, 16, R),
131 /* drops the bottom 8 bits when bit depth is 16 */
132#endif
133#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
134 T(STRIP_ALPHA, NONE, A, X, ALL, R),
135 /* removes the alpha channel if present */
136#endif
137#ifdef PNG_WRITE_PACK_SUPPORTED
138# define TRANSFORM_RW_PACK TRANSFORM_RW
139#else
140# define TRANSFORM_RW_PACK TRANSFORM_R
141#endif
142#ifdef PNG_READ_PACK_SUPPORTED
143 T(PACKING, NONE, X, X, LOW, RW_PACK),
144 /* unpacks low-bit-depth components into 1 byte per component on read,
145 * reverses this on write.
146 */
147#endif
148#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
149# define TRANSFORM_RW_PACKSWAP TRANSFORM_RW
150#else
151# define TRANSFORM_RW_PACKSWAP TRANSFORM_R
152#endif
153#ifdef PNG_READ_PACKSWAP_SUPPORTED
154 T(PACKSWAP, NONE, X, X, LOW, RW_PACKSWAP),
155 /* reverses the order of low-bit-depth components packed into a byte */
156#endif
157#ifdef PNG_READ_EXPAND_SUPPORTED
158 T(EXPAND, NONE, P, X, ALL, R),
159 /* expands PLTE PNG files to RGB (no tRNS) or RGBA (tRNS) *
160 * Note that the 'EXPAND' transform does lots of different things: */
161 T(EXPAND, NONE, X, C, ALL, R),
162 /* expands grayscale PNG files to RGB, or RGBA */
163 T(EXPAND, tRNS, X, A, ALL, R),
164 /* expands the tRNS chunk in files without alpha */
165#endif
166#ifdef PNG_WRITE_INVERT_SUPPORTED
167# define TRANSFORM_RW_INVERT TRANSFORM_RW
168#else
169# define TRANSFORM_RW_INVERT TRANSFORM_R
170#endif
171#ifdef PNG_READ_INVERT_SUPPORTED
172 T(INVERT_MONO, NONE, X, C, ALL, RW_INVERT),
173 /* converts gray-scale components to 1..0 from 0..1 */
174#endif
175#ifdef PNG_WRITE_SHIFT_SUPPORTED
176# define TRANSFORM_RW_SHIFT TRANSFORM_RW
177#else
178# define TRANSFORM_RW_SHIFT TRANSFORM_R
179#endif
180#ifdef PNG_READ_SHIFT_SUPPORTED
181 T(SHIFT, sBIT, X, X, ALL, RW_SHIFT),
182 /* reduces component values to the original range based on the sBIT chunk,
183 * this is only partially reversible - the low bits are lost and cannot be
184 * recovered on write. In fact write code replicates the bits to generate
185 * new low-order bits.
186 */
187#endif
188#ifdef PNG_WRITE_BGR_SUPPORTED
189# define TRANSFORM_RW_BGR TRANSFORM_RW
190#else
191# define TRANSFORM_RW_BGR TRANSFORM_R
192#endif
193#ifdef PNG_READ_BGR_SUPPORTED
194 T(BGR, NONE, C, P, TRUE, RW_BGR),
195 /* reverses the rgb component values of true-color pixels */
196#endif
197#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
198# define TRANSFORM_RW_SWAP_ALPHA TRANSFORM_RW
199#else
200# define TRANSFORM_RW_SWAP_ALPHA TRANSFORM_R
201#endif
202#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
203 T(SWAP_ALPHA, NONE, A, X, TRUE, RW_SWAP_ALPHA),
204 /* swaps the alpha channel of RGBA or GA pixels to the front - ARGB or
205 * AG, on write reverses the process.
206 */
207#endif
208#ifdef PNG_WRITE_SWAP_SUPPORTED
209# define TRANSFORM_RW_SWAP TRANSFORM_RW
210#else
211# define TRANSFORM_RW_SWAP TRANSFORM_R
212#endif
213#ifdef PNG_READ_SWAP_SUPPORTED
214 T(SWAP_ENDIAN, NONE, X, P, 16, RW_SWAP),
215 /* byte-swaps 16-bit component values */
216#endif
217#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
218# define TRANSFORM_RW_INVERT_ALPHA TRANSFORM_RW
219#else
220# define TRANSFORM_RW_INVERT_ALPHA TRANSFORM_R
221#endif
222#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
223 T(INVERT_ALPHA, NONE, A, X, TRUE, RW_INVERT_ALPHA),
224 /* converts an alpha channel from 0..1 to 1..0 */
225#endif
226#ifdef PNG_WRITE_FILLER_SUPPORTED
227 T(STRIP_FILLER_BEFORE, NONE, A, P, TRUE, W), /* 'A' for a filler! */
228 /* on write skips a leading filler channel; testing requires data with a
229 * filler channel so this is produced from RGBA or GA images by removing
230 * the 'alpha' flag from the color type in place.
231 */
232 T(STRIP_FILLER_AFTER, NONE, A, P, TRUE, W),
233 /* on write strips a trailing filler channel */
234#endif
235#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
236 T(GRAY_TO_RGB, NONE, X, C, ALL, R),
237 /* expands grayscale images to RGB, also causes the palette part of
238 * 'EXPAND' to happen. Low bit depth grayscale images are expanded to
239 * 8-bits per component and no attempt is made to convert the image to a
240 * palette image. While this transform is partially reversible
241 * png_write_png does not currently support this.
242 */
243 T(GRAY_TO_RGB, NONE, P, X, ALL, R),
244 /* The 'palette' side effect mentioned above; a bit bogus but this is the
245 * way the libpng code works.
246 */
247#endif
248#ifdef PNG_READ_EXPAND_16_SUPPORTED
249 T(EXPAND_16, NONE, X, X, PAL, R),
250 /* expands images to 16-bits per component, as a side effect expands
251 * palette images to RGB and expands the tRNS chunk if present, so it can
252 * modify 16-bit per component images as well:
253 */
254 T(EXPAND_16, tRNS, X, A, 16, R),
255 /* side effect of EXPAND_16 - expands the tRNS chunk in an RGB or G 16-bit
256 * image.
257 */
258#endif
259#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
260 T(SCALE_16, NONE, X, X, 16, R),
261 /* scales 16-bit components to 8-bits. */
262#endif
263
264 { NULL /*name*/, 0, 0, 0, 0, 0, 0, 0/*!tested*/ }
265
266#undef T
267};
268
269#define ARRAY_SIZE(a) ((sizeof a)/(sizeof a[0]))
270#define TTABLE_SIZE ARRAY_SIZE(transform_info)
271
272/* Some combinations of options that should be reversible are not; these cases
273 * are bugs.
274 */
275static int known_bad_combos[][2] =
276{
277 /* problem, antidote */
278 { PNG_TRANSFORM_SHIFT | PNG_TRANSFORM_INVERT_ALPHA, 0/*antidote*/ }
279};
280
281static int
282is_combo(int transforms)
283{
284 return transforms & (transforms-1); /* non-zero if more than one set bit */
285}
286
287static int
288first_transform(int transforms)
289{
290 return transforms & -transforms; /* lowest set bit */
291}
292
293static int
294is_bad_combo(int transforms)
295{
296 unsigned int i;
297
298 for (i=0; i<ARRAY_SIZE(known_bad_combos); ++i)
299 {
300 int combo = known_bad_combos[i][0];
301
302 if ((combo & transforms) == combo &&
303 (transforms & known_bad_combos[i][1]) == 0)
304 return 1;
305 }
306
307 return 0; /* combo is ok */
308}
309
310static const char *
311transform_name(int t)
312 /* The name, if 't' has multiple bits set the name of the lowest set bit is
313 * returned.
314 */
315{
316 unsigned int i;
317
318 t &= -t; /* first set bit */
319
320 for (i=0; i<TTABLE_SIZE; ++i) if (transform_info[i].name != NULL)
321 {
322 if ((transform_info[i].transform & t) != 0)
323 return transform_info[i].name;
324 }
325
326 return "invalid transform";
327}
328
329/* Variables calculated by validate_T below and used to record all the supported
330 * transforms. Need (unsigned int) here because of the places where these
331 * values are used (unsigned compares in the 'exhaustive' iterator.)
332 */
333static unsigned int read_transforms, write_transforms, rw_transforms;
334
335static void
336validate_T(void)
337 /* Validate the above table - this just builds the above values */
338{
339 unsigned int i;
340
341 for (i=0; i<TTABLE_SIZE; ++i) if (transform_info[i].name != NULL)
342 {
343 if (transform_info[i].when & TRANSFORM_R)
344 read_transforms |= transform_info[i].transform;
345
346 if (transform_info[i].when & TRANSFORM_W)
347 write_transforms |= transform_info[i].transform;
348 }
349
350 /* Reversible transforms are those which are supported on both read and
351 * write.
352 */
353 rw_transforms = read_transforms & write_transforms;
354}
355
356/* FILE DATA HANDLING
357 * The original file is cached in memory. During write the output file is
358 * written to memory.
359 *
360 * In both cases the file data is held in a linked list of buffers - not all
361 * of these are in use at any time.
362 */
363#define NEW(type) ((type *)malloc(sizeof (type)))
364#define DELETE(ptr) (free(ptr))
365
366struct buffer_list
367{
368 struct buffer_list *next; /* next buffer in list */
369 png_byte buffer[1024]; /* the actual buffer */
370};
371
372struct buffer
373{
374 struct buffer_list *last; /* last buffer in use */
375 size_t end_count; /* bytes in the last buffer */
376 struct buffer_list *current; /* current buffer being read */
377 size_t read_count; /* count of bytes read from current */
378 struct buffer_list first; /* the very first buffer */
379};
380
381static void
382buffer_init(struct buffer *buffer)
383 /* Call this only once for a given buffer */
384{
385 buffer->first.next = NULL;
386 buffer->last = NULL;
387 buffer->current = NULL;
388}
389
390static void
391buffer_destroy_list(struct buffer_list *list)
392{
393 if (list != NULL)
394 {
395 struct buffer_list *next = list->next;
396 DELETE(list);
397 buffer_destroy_list(next);
398 }
399}
400
401static void
402buffer_destroy(struct buffer *buffer)
403{
404 struct buffer_list *list = buffer->first.next;
405 buffer_init(buffer);
406 buffer_destroy_list(list);
407}
408
409#ifdef PNG_WRITE_PNG_SUPPORTED
410static void
411buffer_start_write(struct buffer *buffer)
412{
413 buffer->last = &buffer->first;
414 buffer->end_count = 0;
415 buffer->current = NULL;
416}
417#endif
418
419static void
420buffer_start_read(struct buffer *buffer)
421{
422 buffer->current = &buffer->first;
423 buffer->read_count = 0;
424}
425
426#ifdef ENOMEM /* required by POSIX 1003.1 */
427# define MEMORY ENOMEM
428#else
429# define MEMORY ERANGE /* required by ANSI-C */
430#endif
431static struct buffer *
432get_buffer(png_structp pp)
433 /* Used from libpng callbacks to get the current buffer */
434{
435 return (struct buffer*)png_get_io_ptr(pp);
436}
437
438static struct buffer_list *
439buffer_extend(struct buffer_list *current)
440{
441 struct buffer_list *add;
442
443 assert(current->next == NULL);
444
445 add = NEW(struct buffer_list);
446 if (add == NULL)
447 return NULL;
448
449 add->next = NULL;
450 current->next = add;
451
452 return add;
453}
454
455/* Load a buffer from a file; does the equivalent of buffer_start_write. On a
456 * read error returns an errno value, else returns 0.
457 */
458static int
459buffer_from_file(struct buffer *buffer, FILE *fp)
460{
461 struct buffer_list *last = &buffer->first;
462 size_t count = 0;
463
464 for (;;)
465 {
466 size_t r = fread(last->buffer+count, 1/*size*/,
467 (sizeof last->buffer)-count, fp);
468
469 if (r > 0)
470 {
471 count += r;
472
473 if (count >= sizeof last->buffer)
474 {
475 assert(count == sizeof last->buffer);
476 count = 0;
477
478 if (last->next == NULL)
479 {
480 last = buffer_extend(last);
481 if (last == NULL)
482 return MEMORY;
483 }
484
485 else
486 last = last->next;
487 }
488 }
489
490 else /* fread failed - probably end of file */
491 {
492 if (feof(fp))
493 {
494 buffer->last = last;
495 buffer->end_count = count;
496 return 0; /* no error */
497 }
498
499 /* Some kind of funky error; errno should be non-zero */
500 return errno == 0 ? ERANGE : errno;
501 }
502 }
503}
504
505/* This structure is used to control the test of a single file. */
506typedef enum
507{
508 VERBOSE, /* switches on all messages */
509 INFORMATION,
510 WARNINGS, /* switches on warnings */
511 LIBPNG_WARNING,
512 APP_WARNING,
513 ERRORS, /* just errors */
514 APP_FAIL, /* continuable error - no need to longjmp */
515 LIBPNG_ERROR, /* this and higher cause a longjmp */
516 LIBPNG_BUG, /* erroneous behavior in libpng */
517 APP_ERROR, /* such as out-of-memory in a callback */
518 QUIET, /* no normal messages */
519 USER_ERROR, /* such as file-not-found */
520 INTERNAL_ERROR
521} error_level;
522#define LEVEL_MASK 0xf /* where the level is in 'options' */
523
524#define EXHAUSTIVE 0x010 /* Test all combinations of active options */
525#define STRICT 0x020 /* Fail on warnings as well as errors */
526#define LOG 0x040 /* Log pass/fail to stdout */
527#define CONTINUE 0x080 /* Continue on APP_FAIL errors */
528#define SKIP_BUGS 0x100 /* Skip over known bugs */
529#define LOG_SKIPPED 0x200 /* Log skipped bugs */
530#define FIND_BAD_COMBOS 0x400 /* Attempt to deduce bad combos */
531#define LIST_COMBOS 0x800 /* List combos by name */
532
533/* Result masks apply to the result bits in the 'results' field below; these
534 * bits are simple 1U<<error_level. A pass requires either nothing worse than
535 * warnings (--relaxes) or nothing worse than information (--strict)
536 */
537#define RESULT_STRICT(r) (((r) & ~((1U<<WARNINGS)-1)) == 0)
538#define RESULT_RELAXED(r) (((r) & ~((1U<<ERRORS)-1)) == 0)
539
540struct display
541{
542 jmp_buf error_return; /* Where to go to on error */
543
544 const char *filename; /* The name of the original file */
545 const char *operation; /* Operation being performed */
546 int transforms; /* Transform used in operation */
547 png_uint_32 options; /* See display_log below */
548 png_uint_32 results; /* A mask of errors seen */
549
550
551 png_structp original_pp; /* used on the original read */
552 png_infop original_ip; /* set by the original read */
553
554 size_t original_rowbytes; /* of the original rows: */
555 png_bytepp original_rows; /* from the original read */
556
557 /* Original chunks valid */
558 png_uint_32 chunks;
559
560 /* Original IHDR information */
561 png_uint_32 width;
562 png_uint_32 height;
563 int bit_depth;
564 int color_type;
565 int interlace_method;
566 int compression_method;
567 int filter_method;
568
569 /* Derived information for the original image. */
570 int active_transforms; /* transforms that do something on read */
571 int ignored_transforms; /* transforms that should do nothing */
572
573 /* Used on a read, both the original read and when validating a written
574 * image.
575 */
576 png_structp read_pp;
577 png_infop read_ip;
578
579# ifdef PNG_WRITE_PNG_SUPPORTED
580 /* Used to write a new image (the original info_ptr is used) */
581 png_structp write_pp;
582 struct buffer written_file; /* where the file gets written */
583# endif
584
585 struct buffer original_file; /* Data read from the original file */
586};
587
588static void
589display_init(struct display *dp)
590 /* Call this only once right at the start to initialize the control
591 * structure, the (struct buffer) lists are maintained across calls - the
592 * memory is not freed.
593 */
594{
595 memset(dp, 0, sizeof *dp);
596 dp->options = WARNINGS; /* default to !verbose, !quiet */
597 dp->filename = NULL;
598 dp->operation = NULL;
599 dp->original_pp = NULL;
600 dp->original_ip = NULL;
601 dp->original_rows = NULL;
602 dp->read_pp = NULL;
603 dp->read_ip = NULL;
604 buffer_init(&dp->original_file);
605
606# ifdef PNG_WRITE_PNG_SUPPORTED
607 dp->write_pp = NULL;
608 buffer_init(&dp->written_file);
609# endif
610}
611
612static void
613display_clean_read(struct display *dp)
614{
615 if (dp->read_pp != NULL)
616 png_destroy_read_struct(&dp->read_pp, &dp->read_ip, NULL);
617}
618
619#ifdef PNG_WRITE_PNG_SUPPORTED
620static void
621display_clean_write(struct display *dp)
622{
623 if (dp->write_pp != NULL)
624 png_destroy_write_struct(&dp->write_pp, NULL);
625}
626#endif
627
628static void
629display_clean(struct display *dp)
630{
631# ifdef PNG_WRITE_PNG_SUPPORTED
632 display_clean_write(dp);
633# endif
634 display_clean_read(dp);
635
636 dp->original_rowbytes = 0;
637 dp->original_rows = NULL;
638 dp->chunks = 0;
639
640 png_destroy_read_struct(&dp->original_pp, &dp->original_ip, NULL);
641 /* leave the filename for error detection */
642 dp->results = 0; /* reset for next time */
643}
644
645static void
646display_destroy(struct display *dp)
647{
648 /* Release any memory held in the display. */
649# ifdef PNG_WRITE_PNG_SUPPORTED
650 buffer_destroy(&dp->written_file);
651# endif
652
653 buffer_destroy(&dp->original_file);
654}
655
656static struct display *
657get_dp(png_structp pp)
658 /* The display pointer is always stored in the png_struct error pointer */
659{
660 struct display *dp = (struct display*)png_get_error_ptr(pp);
661
662 if (dp == NULL)
663 {
664 fprintf(stderr, "pngimage: internal error (no display)\n");
665 exit(99); /* prevents a crash */
666 }
667
668 return dp;
669}
670
671/* error handling */
672#ifdef __GNUC__
673# define VGATTR __attribute__((__format__ (__printf__,3,4)))
674 /* Required to quiet GNUC warnings when the compiler sees a stdarg function
675 * that calls one of the stdio v APIs.
676 */
677#else
678# define VGATTR
679#endif
680static void VGATTR
681display_log(struct display *dp, error_level level, const char *fmt, ...)
682 /* 'level' is as above, fmt is a stdio style format string. This routine
683 * does not return if level is above LIBPNG_WARNING
684 */
685{
686 dp->results |= 1U << level;
687
688 if (level > (error_level)(dp->options & LEVEL_MASK))
689 {
690 const char *lp;
691 va_list ap;
692
693 switch (level)
694 {
695 case INFORMATION: lp = "information"; break;
696 case LIBPNG_WARNING: lp = "warning(libpng)"; break;
697 case APP_WARNING: lp = "warning(pngimage)"; break;
698 case APP_FAIL: lp = "error(continuable)"; break;
699 case LIBPNG_ERROR: lp = "error(libpng)"; break;
700 case LIBPNG_BUG: lp = "bug(libpng)"; break;
701 case APP_ERROR: lp = "error(pngimage)"; break;
702 case USER_ERROR: lp = "error(user)"; break;
703
704 case INTERNAL_ERROR: /* anything unexpected is an internal error: */
705 case VERBOSE: case WARNINGS: case ERRORS: case QUIET:
706 default: lp = "bug(pngimage)"; break;
707 }
708
709 fprintf(stderr, "%s: %s: %s",
710 dp->filename != NULL ? dp->filename : "<stdin>", lp, dp->operation);
711
712 if (dp->transforms != 0)
713 {
714 int tr = dp->transforms;
715
716 if (is_combo(tr))
717 {
718 if (dp->options & LIST_COMBOS)
719 {
720 int trx = tr;
721
722 fprintf(stderr, "(");
723 if (trx)
724 {
725 int start = 0;
726
727 while (trx)
728 {
729 int trz = trx & -trx;
730
731 if (start) fprintf(stderr, "+");
732 fprintf(stderr, "%s", transform_name(trz));
733 start = 1;
734 trx &= ~trz;
735 }
736 }
737
738 else
739 fprintf(stderr, "-");
740 fprintf(stderr, ")");
741 }
742
743 else
744 fprintf(stderr, "(0x%x)", tr);
745 }
746
747 else
748 fprintf(stderr, "(%s)", transform_name(tr));
749 }
750
751 fprintf(stderr, ": ");
752
753 va_start(ap, fmt);
754 vfprintf(stderr, fmt, ap);
755 va_end(ap);
756
757 fputc('\n', stderr);
758 }
759 /* else do not output any message */
760
761 /* Errors cause this routine to exit to the fail code */
762 if (level > APP_FAIL || (level > ERRORS && !(dp->options & CONTINUE)))
763 longjmp(dp->error_return, level);
764}
765
766/* error handler callbacks for libpng */
767static void PNGCBAPI
768display_warning(png_structp pp, png_const_charp warning)
769{
770 display_log(get_dp(pp), LIBPNG_WARNING, "%s", warning);
771}
772
773static void PNGCBAPI
774display_error(png_structp pp, png_const_charp error)
775{
776 struct display *dp = get_dp(pp);
777
778 display_log(dp, LIBPNG_ERROR, "%s", error);
779}
780
781static void
782display_cache_file(struct display *dp, const char *filename)
783 /* Does the initial cache of the file. */
784{
785 FILE *fp;
786 int ret;
787
788 dp->filename = filename;
789
790 if (filename != NULL)
791 {
792 fp = fopen(filename, "rb");
793 if (fp == NULL)
794 display_log(dp, USER_ERROR, "open failed: %s", strerror(errno));
795 }
796
797 else
798 fp = stdin;
799
800 ret = buffer_from_file(&dp->original_file, fp);
801
802 fclose(fp);
803
804 if (ret != 0)
805 display_log(dp, APP_ERROR, "read failed: %s", strerror(ret));
806}
807
808static void
809buffer_read(struct display *dp, struct buffer *bp, png_bytep data,
810 size_t size)
811{
812 struct buffer_list *last = bp->current;
813 size_t read_count = bp->read_count;
814
815 while (size > 0)
816 {
817 size_t avail;
818
819 if (last == NULL ||
820 (last == bp->last && read_count >= bp->end_count))
821 {
822 display_log(dp, USER_ERROR, "file truncated (%lu bytes)",
823 (unsigned long)size);
824 /*NOTREACHED*/
825 break;
826 }
827
828 else if (read_count >= sizeof last->buffer)
829 {
830 /* Move to the next buffer: */
831 last = last->next;
832 read_count = 0;
833 bp->current = last; /* Avoid update outside the loop */
834
835 /* And do a sanity check (the EOF case is caught above) */
836 if (last == NULL)
837 {
838 display_log(dp, INTERNAL_ERROR, "damaged buffer list");
839 /*NOTREACHED*/
840 break;
841 }
842 }
843
844 avail = (sizeof last->buffer) - read_count;
845 if (avail > size)
846 avail = size;
847
848 memcpy(data, last->buffer + read_count, avail);
849 read_count += avail;
850 size -= avail;
851 data += avail;
852 }
853
854 bp->read_count = read_count;
855}
856
857static void PNGCBAPI
858read_function(png_structp pp, png_bytep data, size_t size)
859{
860 buffer_read(get_dp(pp), get_buffer(pp), data, size);
861}
862
863static void
864read_png(struct display *dp, struct buffer *bp, const char *operation,
865 int transforms)
866{
867 png_structp pp;
868 png_infop ip;
869
870 /* This cleans out any previous read and sets operation and transforms to
871 * empty.
872 */
873 display_clean_read(dp);
874
875 if (operation != NULL) /* else this is a verify and do not overwrite info */
876 {
877 dp->operation = operation;
878 dp->transforms = transforms;
879 }
880
881 dp->read_pp = pp = png_create_read_struct(PNG_LIBPNG_VER_STRING, dp,
882 display_error, display_warning);
883 if (pp == NULL)
884 display_log(dp, LIBPNG_ERROR, "failed to create read struct");
885
886 /* The png_read_png API requires us to make the info struct, but it does the
887 * call to png_read_info.
888 */
889 dp->read_ip = ip = png_create_info_struct(pp);
890 if (ip == NULL)
891 display_log(dp, LIBPNG_ERROR, "failed to create info struct");
892
893# ifdef PNG_SET_USER_LIMITS_SUPPORTED
894 /* Remove the user limits, if any */
895 png_set_user_limits(pp, 0x7fffffff, 0x7fffffff);
896# endif
897
898 /* Set the IO handling */
899 buffer_start_read(bp);
900 png_set_read_fn(pp, bp, read_function);
901
902 png_read_png(pp, ip, transforms, NULL/*params*/);
903
904#if 0 /* crazy debugging */
905 {
906 png_bytep pr = png_get_rows(pp, ip)[0];
907 size_t rb = png_get_rowbytes(pp, ip);
908 size_t cb;
909 char c = ' ';
910
911 fprintf(stderr, "%.4x %2d (%3lu bytes):", transforms, png_get_bit_depth(pp,ip), (unsigned long)rb);
912
913 for (cb=0; cb<rb; ++cb)
914 fputc(c, stderr), fprintf(stderr, "%.2x", pr[cb]), c='.';
915
916 fputc('\n', stderr);
917 }
918#endif
919}
920
921static void
922update_display(struct display *dp)
923 /* called once after the first read to update all the info, original_pp and
924 * original_ip must have been filled in.
925 */
926{
927 png_structp pp;
928 png_infop ip;
929
930 /* Now perform the initial read with a 0 transform. */
931 read_png(dp, &dp->original_file, "original read", 0/*no transform*/);
932
933 /* Move the result to the 'original' fields */
934 dp->original_pp = pp = dp->read_pp, dp->read_pp = NULL;
935 dp->original_ip = ip = dp->read_ip, dp->read_ip = NULL;
936
937 dp->original_rowbytes = png_get_rowbytes(pp, ip);
938 if (dp->original_rowbytes == 0)
939 display_log(dp, LIBPNG_BUG, "png_get_rowbytes returned 0");
940
941 dp->chunks = png_get_valid(pp, ip, 0xffffffff);
942 if ((dp->chunks & PNG_INFO_IDAT) == 0) /* set by png_read_png */
943 display_log(dp, LIBPNG_BUG, "png_read_png did not set IDAT flag");
944
945 dp->original_rows = png_get_rows(pp, ip);
946 if (dp->original_rows == NULL)
947 display_log(dp, LIBPNG_BUG, "png_read_png did not create row buffers");
948
949 if (!png_get_IHDR(pp, ip,
950 &dp->width, &dp->height, &dp->bit_depth, &dp->color_type,
951 &dp->interlace_method, &dp->compression_method, &dp->filter_method))
952 display_log(dp, LIBPNG_BUG, "png_get_IHDR failed");
953
954 /* 'active' transforms are discovered based on the original image format;
955 * running one active transform can activate others. At present the code
956 * does not attempt to determine the closure.
957 */
958 {
959 png_uint_32 chunks = dp->chunks;
960 int active = 0, inactive = 0;
961 int ct = dp->color_type;
962 int bd = dp->bit_depth;
963 unsigned int i;
964
965 for (i=0; i<TTABLE_SIZE; ++i) if (transform_info[i].name != NULL)
966 {
967 int transform = transform_info[i].transform;
968
969 if ((transform_info[i].valid_chunks == 0 ||
970 (transform_info[i].valid_chunks & chunks) != 0) &&
971 (transform_info[i].color_mask_required & ct) ==
972 transform_info[i].color_mask_required &&
973 (transform_info[i].color_mask_absent & ct) == 0 &&
974 (transform_info[i].bit_depths & bd) != 0 &&
975 (transform_info[i].when & TRANSFORM_R) != 0)
976 active |= transform;
977
978 else if ((transform_info[i].when & TRANSFORM_R) != 0)
979 inactive |= transform;
980 }
981
982 /* Some transforms appear multiple times in the table; the 'active' status
983 * is the logical OR of these and the inactive status must be adjusted to
984 * take this into account.
985 */
986 inactive &= ~active;
987
988 dp->active_transforms = active;
989 dp->ignored_transforms = inactive; /* excluding write-only transforms */
990 }
991}
992
993static int
994compare_read(struct display *dp, int applied_transforms)
995{
996 /* Compare the png_info from read_ip with original_info */
997 size_t rowbytes;
998 png_uint_32 width, height;
999 int bit_depth, color_type;
1000 int interlace_method, compression_method, filter_method;
1001 const char *e = NULL;
1002
1003 png_get_IHDR(dp->read_pp, dp->read_ip, &width, &height, &bit_depth,
1004 &color_type, &interlace_method, &compression_method, &filter_method);
1005
1006# define C(item) if (item != dp->item) \
1007 display_log(dp, APP_WARNING, "IHDR " #item "(%lu) changed to %lu",\
1008 (unsigned long)dp->item, (unsigned long)item), e = #item
1009
1010 /* The IHDR should be identical: */
1011 C(width);
1012 C(height);
1013 C(bit_depth);
1014 C(color_type);
1015 C(interlace_method);
1016 C(compression_method);
1017 C(filter_method);
1018
1019 /* 'e' remains set to the name of the last thing changed: */
1020 if (e)
1021 display_log(dp, APP_ERROR, "IHDR changed (%s)", e);
1022
1023 /* All the chunks from the original PNG should be preserved in the output PNG
1024 * because the PNG format has not been changed.
1025 */
1026 {
1027 unsigned long chunks =
1028 png_get_valid(dp->read_pp, dp->read_ip, 0xffffffff);
1029
1030 if (chunks != dp->chunks)
1031 display_log(dp, APP_FAIL, "PNG chunks changed from 0x%lx to 0x%lx",
1032 (unsigned long)dp->chunks, chunks);
1033 }
1034
1035 /* rowbytes should be the same */
1036 rowbytes = png_get_rowbytes(dp->read_pp, dp->read_ip);
1037
1038 /* NOTE: on 64-bit systems this may trash the top bits of rowbytes,
1039 * which could lead to weird error messages.
1040 */
1041 if (rowbytes != dp->original_rowbytes)
1042 display_log(dp, APP_ERROR, "PNG rowbytes changed from %lu to %lu",
1043 (unsigned long)dp->original_rowbytes, (unsigned long)rowbytes);
1044
1045 /* The rows should be the same too, unless the applied transforms includes
1046 * the shift transform, in which case low bits may have been lost.
1047 */
1048 {
1049 png_bytepp rows = png_get_rows(dp->read_pp, dp->read_ip);
1050 unsigned int mask; /* mask (if not zero) for the final byte */
1051
1052 if (bit_depth < 8)
1053 {
1054 /* Need the stray bits at the end, this depends only on the low bits
1055 * of the image width; overflow does not matter. If the width is an
1056 * exact multiple of 8 bits this gives a mask of 0, not 0xff.
1057 */
1058 mask = 0xff & (0xff00 >> ((bit_depth * width) & 7));
1059 }
1060
1061 else
1062 mask = 0;
1063
1064 if (rows == NULL)
1065 display_log(dp, LIBPNG_BUG, "png_get_rows returned NULL");
1066
1067 if ((applied_transforms & PNG_TRANSFORM_SHIFT) == 0 ||
1068 (dp->active_transforms & PNG_TRANSFORM_SHIFT) == 0 ||
1069 color_type == PNG_COLOR_TYPE_PALETTE)
1070 {
1071 unsigned long y;
1072
1073 for (y=0; y<height; ++y)
1074 {
1075 png_bytep row = rows[y];
1076 png_bytep orig = dp->original_rows[y];
1077
1078 if (memcmp(row, orig, rowbytes-(mask != 0)) != 0 || (mask != 0 &&
1079 ((row[rowbytes-1] & mask) != (orig[rowbytes-1] & mask))))
1080 {
1081 size_t x;
1082
1083 /* Find the first error */
1084 for (x=0; x<rowbytes-1; ++x) if (row[x] != orig[x])
1085 break;
1086
1087 display_log(dp, APP_FAIL,
1088 "byte(%lu,%lu) changed 0x%.2x -> 0x%.2x",
1089 (unsigned long)x, (unsigned long)y, orig[x], row[x]);
1090 return 0; /* don't keep reporting failed rows on 'continue' */
1091 }
1092 }
1093 }
1094
1095 else
1096# ifdef PNG_sBIT_SUPPORTED
1097 {
1098 unsigned long y;
1099 int bpp; /* bits-per-pixel then bytes-per-pixel */
1100 /* components are up to 8 bytes in size */
1101 png_byte sig_bits[8];
1102 png_color_8p sBIT;
1103
1104 if (png_get_sBIT(dp->read_pp, dp->read_ip, &sBIT) != PNG_INFO_sBIT)
1105 display_log(dp, INTERNAL_ERROR,
1106 "active shift transform but no sBIT in file");
1107
1108 switch (color_type)
1109 {
1110 case PNG_COLOR_TYPE_GRAY:
1111 sig_bits[0] = sBIT->gray;
1112 bpp = bit_depth;
1113 break;
1114
1115 case PNG_COLOR_TYPE_GA:
1116 sig_bits[0] = sBIT->gray;
1117 sig_bits[1] = sBIT->alpha;
1118 bpp = 2 * bit_depth;
1119 break;
1120
1121 case PNG_COLOR_TYPE_RGB:
1122 sig_bits[0] = sBIT->red;
1123 sig_bits[1] = sBIT->green;
1124 sig_bits[2] = sBIT->blue;
1125 bpp = 3 * bit_depth;
1126 break;
1127
1128 case PNG_COLOR_TYPE_RGBA:
1129 sig_bits[0] = sBIT->red;
1130 sig_bits[1] = sBIT->green;
1131 sig_bits[2] = sBIT->blue;
1132 sig_bits[3] = sBIT->alpha;
1133 bpp = 4 * bit_depth;
1134 break;
1135
1136 default:
1137 display_log(dp, LIBPNG_ERROR, "invalid colour type %d",
1138 color_type);
1139 /*NOTREACHED*/
1140 bpp = 0;
1141 break;
1142 }
1143
1144 {
1145 int b;
1146
1147 for (b=0; 8*b<bpp; ++b)
1148 {
1149 /* libpng should catch this; if not there is a security issue
1150 * because an app (like this one) may overflow an array. In fact
1151 * libpng doesn't catch this at present.
1152 */
1153 if (sig_bits[b] == 0 || sig_bits[b] > bit_depth/*!palette*/)
1154 display_log(dp, LIBPNG_BUG,
1155 "invalid sBIT[%u] value %d returned for PNG bit depth %d",
1156 b, sig_bits[b], bit_depth);
1157 }
1158 }
1159
1160 if (bpp < 8 && bpp != bit_depth)
1161 {
1162 /* sanity check; this is a grayscale PNG; something is wrong in the
1163 * code above.
1164 */
1165 display_log(dp, INTERNAL_ERROR, "invalid bpp %u for bit_depth %u",
1166 bpp, bit_depth);
1167 }
1168
1169 switch (bit_depth)
1170 {
1171 int b;
1172
1173 case 16: /* Two bytes per component, big-endian */
1174 for (b = (bpp >> 4); b > 0; --b)
1175 {
1176 unsigned int sig = (unsigned int)(0xffff0000 >> sig_bits[b]);
1177
1178 sig_bits[2*b+1] = (png_byte)sig;
1179 sig_bits[2*b+0] = (png_byte)(sig >> 8); /* big-endian */
1180 }
1181 break;
1182
1183 case 8: /* One byte per component */
1184 for (b=0; b*8 < bpp; ++b)
1185 sig_bits[b] = (png_byte)(0xff00 >> sig_bits[b]);
1186 break;
1187
1188 case 1: /* allowed, but dumb */
1189 /* Value is 1 */
1190 sig_bits[0] = 0xff;
1191 break;
1192
1193 case 2: /* Replicate 4 times */
1194 /* Value is 1 or 2 */
1195 b = 0x3 & ((0x3<<2) >> sig_bits[0]);
1196 b |= b << 2;
1197 b |= b << 4;
1198 sig_bits[0] = (png_byte)b;
1199 break;
1200
1201 case 4: /* Relicate twice */
1202 /* Value is 1, 2, 3 or 4 */
1203 b = 0xf & ((0xf << 4) >> sig_bits[0]);
1204 b |= b << 4;
1205 sig_bits[0] = (png_byte)b;
1206 break;
1207
1208 default:
1209 display_log(dp, LIBPNG_BUG, "invalid bit depth %d", bit_depth);
1210 break;
1211 }
1212
1213 /* Convert bpp to bytes; this gives '1' for low-bit depth grayscale,
1214 * where there are multiple pixels per byte.
1215 */
1216 bpp = (bpp+7) >> 3;
1217
1218 /* The mask can be combined with sig_bits[0] */
1219 if (mask != 0)
1220 {
1221 mask &= sig_bits[0];
1222
1223 if (bpp != 1 || mask == 0)
1224 display_log(dp, INTERNAL_ERROR, "mask calculation error %u, %u",
1225 bpp, mask);
1226 }
1227
1228 for (y=0; y<height; ++y)
1229 {
1230 png_bytep row = rows[y];
1231 png_bytep orig = dp->original_rows[y];
1232 unsigned long x;
1233
1234 for (x=0; x<(width-(mask!=0)); ++x)
1235 {
1236 int b;
1237
1238 for (b=0; b<bpp; ++b)
1239 {
1240 if ((*row++ & sig_bits[b]) != (*orig++ & sig_bits[b]))
1241 {
1242 display_log(dp, APP_FAIL,
1243 "significant bits at (%lu[%u],%lu) changed %.2x->%.2x",
1244 x, b, y, orig[-1], row[-1]);
1245 return 0;
1246 }
1247 }
1248 }
1249
1250 if (mask != 0 && (*row & mask) != (*orig & mask))
1251 {
1252 display_log(dp, APP_FAIL,
1253 "significant bits at (%lu[end],%lu) changed", x, y);
1254 return 0;
1255 }
1256 } /* for y */
1257 }
1258# else /* !sBIT */
1259 display_log(dp, INTERNAL_ERROR,
1260 "active shift transform but no sBIT support");
1261# endif /* !sBIT */
1262 }
1263
1264 return 1; /* compare succeeded */
1265}
1266
1267#ifdef PNG_WRITE_PNG_SUPPORTED
1268static void
1269buffer_write(struct display *dp, struct buffer *buffer, png_bytep data,
1270 size_t size)
1271 /* Generic write function used both from the write callback provided to
1272 * libpng and from the generic read code.
1273 */
1274{
1275 /* Write the data into the buffer, adding buffers as required */
1276 struct buffer_list *last = buffer->last;
1277 size_t end_count = buffer->end_count;
1278
1279 while (size > 0)
1280 {
1281 size_t avail;
1282
1283 if (end_count >= sizeof last->buffer)
1284 {
1285 if (last->next == NULL)
1286 {
1287 last = buffer_extend(last);
1288
1289 if (last == NULL)
1290 display_log(dp, APP_ERROR, "out of memory saving file");
1291 }
1292
1293 else
1294 last = last->next;
1295
1296 buffer->last = last; /* avoid the need to rewrite every time */
1297 end_count = 0;
1298 }
1299
1300 avail = (sizeof last->buffer) - end_count;
1301 if (avail > size)
1302 avail = size;
1303
1304 memcpy(last->buffer + end_count, data, avail);
1305 end_count += avail;
1306 size -= avail;
1307 data += avail;
1308 }
1309
1310 buffer->end_count = end_count;
1311}
1312
1313static void PNGCBAPI
1314write_function(png_structp pp, png_bytep data, size_t size)
1315{
1316 buffer_write(get_dp(pp), get_buffer(pp), data, size);
1317}
1318
1319static void
1320write_png(struct display *dp, png_infop ip, int transforms)
1321{
1322 display_clean_write(dp); /* safety */
1323
1324 buffer_start_write(&dp->written_file);
1325 dp->operation = "write";
1326 dp->transforms = transforms;
1327
1328 dp->write_pp = png_create_write_struct(PNG_LIBPNG_VER_STRING, dp,
1329 display_error, display_warning);
1330
1331 if (dp->write_pp == NULL)
1332 display_log(dp, APP_ERROR, "failed to create write png_struct");
1333
1334 png_set_write_fn(dp->write_pp, &dp->written_file, write_function,
1335 NULL/*flush*/);
1336
1337# ifdef PNG_SET_USER_LIMITS_SUPPORTED
1338 /* Remove the user limits, if any */
1339 png_set_user_limits(dp->write_pp, 0x7fffffff, 0x7fffffff);
1340# endif
1341
1342 /* Certain transforms require the png_info to be zapped to allow the
1343 * transform to work correctly.
1344 */
1345 if (transforms & (PNG_TRANSFORM_PACKING|
1346 PNG_TRANSFORM_STRIP_FILLER|
1347 PNG_TRANSFORM_STRIP_FILLER_BEFORE))
1348 {
1349 int ct = dp->color_type;
1350
1351 if (transforms & (PNG_TRANSFORM_STRIP_FILLER|
1352 PNG_TRANSFORM_STRIP_FILLER_BEFORE))
1353 ct &= ~PNG_COLOR_MASK_ALPHA;
1354
1355 png_set_IHDR(dp->write_pp, ip, dp->width, dp->height, dp->bit_depth, ct,
1356 dp->interlace_method, dp->compression_method, dp->filter_method);
1357 }
1358
1359 png_write_png(dp->write_pp, ip, transforms, NULL/*params*/);
1360
1361 /* Clean it on the way out - if control returns to the caller then the
1362 * written_file contains the required data.
1363 */
1364 display_clean_write(dp);
1365}
1366#endif /* WRITE_PNG */
1367
1368static int
1369skip_transform(struct display *dp, int tr)
1370 /* Helper to test for a bad combo and log it if it is skipped */
1371{
1372 if ((dp->options & SKIP_BUGS) != 0 && is_bad_combo(tr))
1373 {
1374 /* Log this to stdout if logging is on, otherwise just do an information
1375 * display_log.
1376 */
1377 if ((dp->options & LOG_SKIPPED) != 0)
1378 {
1379 printf("SKIP: %s transforms ", dp->filename);
1380
1381 while (tr != 0)
1382 {
1383 int next = first_transform(tr);
1384 tr &= ~next;
1385
1386 printf("%s", transform_name(next));
1387 if (tr != 0)
1388 putchar('+');
1389 }
1390
1391 putchar('\n');
1392 }
1393
1394 else
1395 display_log(dp, INFORMATION, "%s: skipped known bad combo 0x%x",
1396 dp->filename, tr);
1397
1398 return 1; /* skip */
1399 }
1400
1401 return 0; /* don't skip */
1402}
1403
1404static void
1405test_one_file(struct display *dp, const char *filename)
1406{
1407 /* First cache the file and update the display original file
1408 * information for the new file.
1409 */
1410 dp->operation = "cache file";
1411 dp->transforms = 0;
1412 display_cache_file(dp, filename);
1413 update_display(dp);
1414
1415 /* First test: if there are options that should be ignored for this file
1416 * verify that they really are ignored.
1417 */
1418 if (dp->ignored_transforms != 0)
1419 {
1420 read_png(dp, &dp->original_file, "ignored transforms",
1421 dp->ignored_transforms);
1422
1423 /* The result should be identical to the original_rows */
1424 if (!compare_read(dp, 0/*transforms applied*/))
1425 return; /* no point testing more */
1426 }
1427
1428#ifdef PNG_WRITE_PNG_SUPPORTED
1429 /* Second test: write the original PNG data out to a new file (to test the
1430 * write side) then read the result back in and make sure that it hasn't
1431 * changed.
1432 */
1433 dp->operation = "write";
1434 write_png(dp, dp->original_ip, 0/*transforms*/);
1435 read_png(dp, &dp->written_file, NULL, 0/*transforms*/);
1436 if (!compare_read(dp, 0/*transforms applied*/))
1437 return;
1438#endif
1439
1440 /* Third test: the active options. Test each in turn, or, with the
1441 * EXHAUSTIVE option, test all possible combinations.
1442 */
1443 {
1444 /* Use unsigned int here because the code below to increment through all
1445 * the possibilities exhaustively has to use a compare and that must be
1446 * unsigned, because some transforms are negative on a 16-bit system.
1447 */
1448 unsigned int active = dp->active_transforms;
1449 int exhaustive = (dp->options & EXHAUSTIVE) != 0;
1450 unsigned int current = first_transform(active);
1451 unsigned int bad_transforms = 0;
1452 unsigned int bad_combo = ~0U; /* bitwise AND of failing transforms */
1453 unsigned int bad_combo_list = 0; /* bitwise OR of failures */
1454
1455 for (;;)
1456 {
1457 read_png(dp, &dp->original_file, "active transforms", current);
1458
1459 /* If this involved any irreversible transformations then if we write
1460 * it out with just the reversible transformations and read it in again
1461 * with the same transforms we should get the same thing. At present
1462 * this isn't done - it just seems like a waste of time and it would
1463 * require two sets of read png_struct/png_info.
1464 *
1465 * If there were no irreversible transformations then if we write it
1466 * out and read it back in again (without the reversible transforms)
1467 * we should get back to the place where we started.
1468 */
1469#ifdef PNG_WRITE_PNG_SUPPORTED
1470 if ((current & write_transforms) == current)
1471 {
1472 /* All transforms reversible: write the PNG with the transformations
1473 * reversed, then read it back in with no transformations. The
1474 * result should be the same as the original apart from the loss of
1475 * low order bits because of the SHIFT/sBIT transform.
1476 */
1477 dp->operation = "reversible transforms";
1478 write_png(dp, dp->read_ip, current);
1479
1480 /* And if this is read back in, because all the transformations were
1481 * reversible, the result should be the same.
1482 */
1483 read_png(dp, &dp->written_file, NULL, 0);
1484 if (!compare_read(dp, current/*for the SHIFT/sBIT transform*/))
1485 {
1486 /* This set of transforms failed. If a single bit is set - if
1487 * there is just one transform - don't include this in further
1488 * 'exhaustive' tests. Notice that each transform is tested on
1489 * its own before testing combos in the exhaustive case.
1490 */
1491 if (is_combo(current))
1492 {
1493 bad_combo &= current;
1494 bad_combo_list |= current;
1495 }
1496
1497 else
1498 bad_transforms |= current;
1499 }
1500 }
1501#endif
1502
1503 /* Now move to the next transform */
1504 if (exhaustive) /* all combinations */
1505 {
1506 unsigned int next = current;
1507
1508 do
1509 {
1510 if (next == read_transforms) /* Everything tested */
1511 goto combo;
1512
1513 ++next;
1514 } /* skip known bad combos if the relevant option is set; skip
1515 * combos involving known bad single transforms in all cases.
1516 */
1517 while ( (next & read_transforms) <= current
1518 || (next & active) == 0 /* skip cases that do nothing */
1519 || (next & bad_transforms) != 0
1520 || skip_transform(dp, next));
1521
1522 assert((next & read_transforms) == next);
1523 current = next;
1524 }
1525
1526 else /* one at a time */
1527 {
1528 active &= ~current;
1529
1530 if (active == 0)
1531 goto combo;
1532
1533 current = first_transform(active);
1534 }
1535 }
1536
1537combo:
1538 if (dp->options & FIND_BAD_COMBOS)
1539 {
1540 /* bad_combos identifies the combos that occur in all failing cases;
1541 * bad_combo_list identifies transforms that do not prevent the
1542 * failure.
1543 */
1544 if (bad_combo != ~0U)
1545 printf("%s[0x%x]: PROBLEM: 0x%x[0x%x] ANTIDOTE: 0x%x\n",
1546 dp->filename, active, bad_combo, bad_combo_list,
1547 rw_transforms & ~bad_combo_list);
1548
1549 else
1550 printf("%s: no %sbad combos found\n", dp->filename,
1551 (dp->options & SKIP_BUGS) ? "additional " : "");
1552 }
1553 }
1554}
1555
1556static int
1557do_test(struct display *dp, const char *file)
1558 /* Exists solely to isolate the setjmp clobbers */
1559{
1560 int ret = setjmp(dp->error_return);
1561
1562 if (ret == 0)
1563 {
1564 test_one_file(dp, file);
1565 return 0;
1566 }
1567
1568 else if (ret < ERRORS) /* shouldn't longjmp on warnings */
1569 display_log(dp, INTERNAL_ERROR, "unexpected return code %d", ret);
1570
1571 return ret;
1572}
1573
1574int
1575main(int argc, char **argv)
1576{
1577 /* For each file on the command line test it with a range of transforms */
1578 int option_end, ilog = 0;
1579 struct display d;
1580
1581 validate_T();
1582 display_init(&d);
1583
1584 for (option_end=1; option_end<argc; ++option_end)
1585 {
1586 const char *name = argv[option_end];
1587
1588 if (strcmp(name, "--verbose") == 0)
1589 d.options = (d.options & ~LEVEL_MASK) | VERBOSE;
1590
1591 else if (strcmp(name, "--warnings") == 0)
1592 d.options = (d.options & ~LEVEL_MASK) | WARNINGS;
1593
1594 else if (strcmp(name, "--errors") == 0)
1595 d.options = (d.options & ~LEVEL_MASK) | ERRORS;
1596
1597 else if (strcmp(name, "--quiet") == 0)
1598 d.options = (d.options & ~LEVEL_MASK) | QUIET;
1599
1600 else if (strcmp(name, "--exhaustive") == 0)
1601 d.options |= EXHAUSTIVE;
1602
1603 else if (strcmp(name, "--fast") == 0)
1604 d.options &= ~EXHAUSTIVE;
1605
1606 else if (strcmp(name, "--strict") == 0)
1607 d.options |= STRICT;
1608
1609 else if (strcmp(name, "--relaxed") == 0)
1610 d.options &= ~STRICT;
1611
1612 else if (strcmp(name, "--log") == 0)
1613 {
1614 ilog = option_end; /* prevent display */
1615 d.options |= LOG;
1616 }
1617
1618 else if (strcmp(name, "--nolog") == 0)
1619 d.options &= ~LOG;
1620
1621 else if (strcmp(name, "--continue") == 0)
1622 d.options |= CONTINUE;
1623
1624 else if (strcmp(name, "--stop") == 0)
1625 d.options &= ~CONTINUE;
1626
1627 else if (strcmp(name, "--skip-bugs") == 0)
1628 d.options |= SKIP_BUGS;
1629
1630 else if (strcmp(name, "--test-all") == 0)
1631 d.options &= ~SKIP_BUGS;
1632
1633 else if (strcmp(name, "--log-skipped") == 0)
1634 d.options |= LOG_SKIPPED;
1635
1636 else if (strcmp(name, "--nolog-skipped") == 0)
1637 d.options &= ~LOG_SKIPPED;
1638
1639 else if (strcmp(name, "--find-bad-combos") == 0)
1640 d.options |= FIND_BAD_COMBOS;
1641
1642 else if (strcmp(name, "--nofind-bad-combos") == 0)
1643 d.options &= ~FIND_BAD_COMBOS;
1644
1645 else if (strcmp(name, "--list-combos") == 0)
1646 d.options |= LIST_COMBOS;
1647
1648 else if (strcmp(name, "--nolist-combos") == 0)
1649 d.options &= ~LIST_COMBOS;
1650
1651 else if (name[0] == '-' && name[1] == '-')
1652 {
1653 fprintf(stderr, "pngimage: %s: unknown option\n", name);
1654 return 99;
1655 }
1656
1657 else
1658 break; /* Not an option */
1659 }
1660
1661 {
1662 int i;
1663 int errors = 0;
1664
1665 for (i=option_end; i<argc; ++i)
1666 {
1667 {
1668 int ret = do_test(&d, argv[i]);
1669
1670 if (ret > QUIET) /* abort on user or internal error */
1671 return 99;
1672 }
1673
1674 /* Here on any return, including failures, except user/internal issues
1675 */
1676 {
1677 int pass = (d.options & STRICT) ?
1678 RESULT_STRICT(d.results) : RESULT_RELAXED(d.results);
1679
1680 if (!pass)
1681 ++errors;
1682
1683 if (d.options & LOG)
1684 {
1685 int j;
1686
1687 printf("%s: pngimage ", pass ? "PASS" : "FAIL");
1688
1689 for (j=1; j<option_end; ++j) if (j != ilog)
1690 printf("%s ", argv[j]);
1691
1692 printf("%s\n", d.filename);
1693 }
1694 }
1695
1696 display_clean(&d);
1697 }
1698
1699 /* Release allocated memory */
1700 display_destroy(&d);
1701
1702 return errors != 0;
1703 }
1704}
1705#else /* !READ_PNG */
1706int
1707main(void)
1708{
1709 fprintf(stderr, "pngimage: no support for png_read/write_image\n");
1710 return SKIP;
1711}
1712#endif
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