2 /* pngunknown.c - test the read side unknown chunk handling
4 * Last changed in libpng 1.6.0 [February 14, 2013]
5 * Copyright (c) 2013 Glenn Randers-Pehrson
6 * Written by John Cunningham Bowler
8 * This code is released under the libpng license.
9 * For conditions of distribution and use, see the disclaimer
10 * and license in png.h
13 * This is a C program that is intended to be linked against libpng. It
14 * allows the libpng unknown handling code to be tested by interpreting
15 * arguments to save or discard combinations of chunks. The program is
16 * currently just a minimal validation for the built-in libpng facilities.
24 /* Define the following to use this test against your installed libpng, rather
25 * than the one being built here:
27 #ifdef PNG_FREESTANDING_TESTS
30 # include "../../png.h"
33 /* Since this program tests the ability to change the unknown chunk handling
34 * these must be defined:
36 #if defined(PNG_SET_UNKNOWN_CHUNKS_SUPPORTED) &&\
37 defined(PNG_READ_SUPPORTED)
39 /* One of these must be defined to allow us to find out what happened. It is
40 * still useful to set unknown chunk handling without either of these in order
41 * to cause *known* chunks to be discarded. This can be a significant
42 * efficiency gain, but it can't really be tested here.
44 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) ||\
45 defined(PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED)
47 #if PNG_LIBPNG_VER < 10500
48 /* This deliberately lacks the PNG_CONST. */
49 typedef png_byte *png_const_bytep;
51 /* This is copied from 1.5.1 png.h: */
52 #define PNG_INTERLACE_ADAM7_PASSES 7
53 #define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7)
54 #define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7)
55 #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
56 #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
57 #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
58 -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
59 #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
60 -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
61 #define PNG_ROW_FROM_PASS_ROW(yIn, pass) \
62 (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
63 #define PNG_COL_FROM_PASS_COL(xIn, pass) \
64 (((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
65 #define PNG_PASS_MASK(pass,off) ( \
66 ((0x110145AFU>>(((7-(off))-(pass))<<2)) & 0xFU) | \
67 ((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U))
68 #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
69 ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
70 #define PNG_COL_IN_INTERLACE_PASS(x, pass) \
71 ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
73 /* These are needed too for the default build: */
74 #define PNG_WRITE_16BIT_SUPPORTED
75 #define PNG_READ_16BIT_SUPPORTED
77 /* This comes from pnglibconf.h afer 1.5: */
78 #define PNG_FP_1 100000
79 #define PNG_GAMMA_THRESHOLD_FIXED\
80 ((png_fixed_point)(PNG_GAMMA_THRESHOLD * PNG_FP_1))
83 #if PNG_LIBPNG_VER < 10600
84 /* 1.6.0 constifies many APIs. The following exists to allow pngvalid to be
85 * compiled against earlier versions.
87 # define png_const_structp png_structp
90 #if PNG_LIBPNG_VER < 10700
91 /* Copied from libpng 1.7.0 png.h */
92 #define PNG_u2(b1, b2) (((unsigned int)(b1) << 8) + (b2))
94 #define PNG_U16(b1, b2) ((png_uint_16)PNG_u2(b1, b2))
95 #define PNG_U32(b1, b2, b3, b4)\
96 (((png_uint_32)PNG_u2(b1, b2) << 16) + PNG_u2(b3, b4))
98 /* Constants for known chunk types.
100 #define png_IDAT PNG_U32( 73, 68, 65, 84)
101 #define png_IEND PNG_U32( 73, 69, 78, 68)
102 #define png_IHDR PNG_U32( 73, 72, 68, 82)
103 #define png_PLTE PNG_U32( 80, 76, 84, 69)
104 #define png_bKGD PNG_U32( 98, 75, 71, 68)
105 #define png_cHRM PNG_U32( 99, 72, 82, 77)
106 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
107 #define png_gAMA PNG_U32(103, 65, 77, 65)
108 #define png_gIFg PNG_U32(103, 73, 70, 103)
109 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
110 #define png_gIFx PNG_U32(103, 73, 70, 120)
111 #define png_hIST PNG_U32(104, 73, 83, 84)
112 #define png_iCCP PNG_U32(105, 67, 67, 80)
113 #define png_iTXt PNG_U32(105, 84, 88, 116)
114 #define png_oFFs PNG_U32(111, 70, 70, 115)
115 #define png_pCAL PNG_U32(112, 67, 65, 76)
116 #define png_pHYs PNG_U32(112, 72, 89, 115)
117 #define png_sBIT PNG_U32(115, 66, 73, 84)
118 #define png_sCAL PNG_U32(115, 67, 65, 76)
119 #define png_sPLT PNG_U32(115, 80, 76, 84)
120 #define png_sRGB PNG_U32(115, 82, 71, 66)
121 #define png_sTER PNG_U32(115, 84, 69, 82)
122 #define png_tEXt PNG_U32(116, 69, 88, 116)
123 #define png_tIME PNG_U32(116, 73, 77, 69)
124 #define png_tRNS PNG_U32(116, 82, 78, 83)
125 #define png_zTXt PNG_U32(122, 84, 88, 116)
127 /* Test on flag values as defined in the spec (section 5.4): */
128 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
129 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
130 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
131 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
132 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
134 #endif /* PNG_LIBPNG_VER < 10700 */
137 # define this not_the_cpp_this
138 # define new not_the_cpp_new
139 # define voidcast(type, value) static_cast<type>(value)
141 # define voidcast(type, value) (value)
142 #endif /* __cplusplus */
144 /* Unused formal parameter errors are removed using the following macro which is
145 * expected to have no bad effects on performance.
148 # if defined(__GNUC__) || defined(_MSC_VER)
149 # define UNUSED(param) (void)param;
151 # define UNUSED(param)
155 /* Types of chunks not known to libpng */
156 #define png_vpAg PNG_U32(118, 112, 65, 103)
158 /* Chunk information */
159 #define PNG_INFO_tEXt 0x10000000U
160 #define PNG_INFO_iTXt 0x20000000U
161 #define PNG_INFO_zTXt 0x40000000U
163 #define PNG_INFO_sTER 0x01000000U
164 #define PNG_INFO_vpAg 0x02000000U
175 int unknown; /* Chunk not known to libpng */
176 int all; /* Chunk set by the '-1' option */
177 int position; /* position in pngtest.png */
178 int keep; /* unknown handling setting */
180 /* Critical chunks */
181 { "IDAT", PNG_INFO_IDAT, png_IDAT, 0, 0, START, 0 }, /* must be [0] */
182 { "PLTE", PNG_INFO_PLTE, png_PLTE, 0, 0, ABSENT, 0 },
184 /* Non-critical chunks that libpng handles */
185 /* This is a mess but it seems to be the only way to do it - there is no way
186 * to check for a definition outside a #if.
188 { "bKGD", PNG_INFO_bKGD, png_bKGD,
189 # ifdef PNG_READ_bKGD_SUPPORTED
195 { "cHRM", PNG_INFO_cHRM, png_cHRM,
196 # ifdef PNG_READ_cHRM_SUPPORTED
202 { "gAMA", PNG_INFO_gAMA, png_gAMA,
203 # ifdef PNG_READ_gAMA_SUPPORTED
209 { "hIST", PNG_INFO_hIST, png_hIST,
210 # ifdef PNG_READ_hIST_SUPPORTED
216 { "iCCP", PNG_INFO_iCCP, png_iCCP,
217 # ifdef PNG_READ_iCCP_SUPPORTED
223 { "iTXt", PNG_INFO_iTXt, png_iTXt,
224 # ifdef PNG_READ_iTXt_SUPPORTED
230 { "oFFs", PNG_INFO_oFFs, png_oFFs,
231 # ifdef PNG_READ_oFFs_SUPPORTED
237 { "pCAL", PNG_INFO_pCAL, png_pCAL,
238 # ifdef PNG_READ_pCAL_SUPPORTED
244 { "pHYs", PNG_INFO_pHYs, png_pHYs,
245 # ifdef PNG_READ_pHYs_SUPPORTED
251 { "sBIT", PNG_INFO_sBIT, png_sBIT,
252 # ifdef PNG_READ_sBIT_SUPPORTED
258 { "sCAL", PNG_INFO_sCAL, png_sCAL,
259 # ifdef PNG_READ_sCAL_SUPPORTED
265 { "sPLT", PNG_INFO_sPLT, png_sPLT,
266 # ifdef PNG_READ_sPLT_SUPPORTED
272 { "sRGB", PNG_INFO_sRGB, png_sRGB,
273 # ifdef PNG_READ_sRGB_SUPPORTED
279 { "tEXt", PNG_INFO_tEXt, png_tEXt,
280 # ifdef PNG_READ_tEXt_SUPPORTED
286 { "tIME", PNG_INFO_tIME, png_tIME,
287 # ifdef PNG_READ_tIME_SUPPORTED
293 { "tRNS", PNG_INFO_tRNS, png_tRNS,
294 # ifdef PNG_READ_tRNS_SUPPORTED
300 { "zTXt", PNG_INFO_zTXt, png_zTXt,
301 # ifdef PNG_READ_zTXt_SUPPORTED
308 /* No libpng handling */
309 { "sTER", PNG_INFO_sTER, png_sTER, 1, 1, START, 0 },
310 { "vpAg", PNG_INFO_vpAg, png_vpAg, 1, 0, START, 0 },
313 #define NINFO ((int)((sizeof chunk_info)/(sizeof chunk_info[0])))
320 chunk_info[i].keep = 0;
324 find(const char *name)
329 if (memcmp(chunk_info[i].name, name, 4) == 0)
337 findb(const png_byte *name)
342 if (memcmp(chunk_info[i].name, name, 4) == 0)
350 find_by_flag(png_uint_32 flag)
354 while (--i >= 0) if (chunk_info[i].flag == flag) return i;
356 fprintf(stderr, "pngunknown: internal error\n");
361 ancillary(const char *name)
363 return PNG_CHUNK_ANCILLARY(PNG_U32(name[0], name[1], name[2], name[3]));
366 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
368 ancillaryb(const png_byte *name)
370 return PNG_CHUNK_ANCILLARY(PNG_U32(name[0], name[1], name[2], name[3]));
374 /* Type of an error_ptr */
377 jmp_buf error_return;
379 png_infop info_ptr, end_ptr;
380 png_uint_32 before_IDAT;
381 png_uint_32 after_IDAT;
384 int keep; /* the default value */
390 static const char init[] = "initialization";
391 static const char cmd[] = "command line";
394 init_display(display *d, const char *program)
396 memset(d, 0, sizeof *d);
398 d->info_ptr = d->end_ptr = NULL;
399 d->error_count = d->warning_count = 0;
400 d->program = program;
406 clean_display(display *d)
408 png_destroy_read_struct(&d->png_ptr, &d->info_ptr, &d->end_ptr);
410 /* This must not happen - it might cause an app crash */
411 if (d->png_ptr != NULL || d->info_ptr != NULL || d->end_ptr != NULL)
413 fprintf(stderr, "%s(%s): png_destroy_read_struct error\n", d->file,
419 PNG_FUNCTION(void, display_exit, (display *d), static PNG_NORETURN)
423 if (d->png_ptr != NULL)
426 /* During initialization and if this is a single command line argument set
427 * exit now - there is only one test, otherwise longjmp to do the next test.
429 if (d->test == init || d->test == cmd)
432 longjmp(d->error_return, 1);
436 display_rc(const display *d, int strict)
438 return d->error_count + (strict ? d->warning_count : 0);
441 /* libpng error and warning callbacks */
442 PNG_FUNCTION(void, (PNGCBAPI error), (png_structp png_ptr, const char *message),
445 display *d = (display*)png_get_error_ptr(png_ptr);
447 fprintf(stderr, "%s(%s): libpng error: %s\n", d->file, d->test, message);
452 warning(png_structp png_ptr, const char *message)
454 display *d = (display*)png_get_error_ptr(png_ptr);
456 fprintf(stderr, "%s(%s): libpng warning: %s\n", d->file, d->test, message);
457 ++(d->warning_count);
461 get_valid(display *d, png_infop info_ptr)
463 png_uint_32 flags = png_get_valid(d->png_ptr, info_ptr, (png_uint_32)~0);
465 /* Map the text chunks back into the flags */
468 png_uint_32 ntext = png_get_text(d->png_ptr, info_ptr, &text, NULL);
470 while (ntext-- > 0) switch (text[ntext].compression)
473 flags |= PNG_INFO_tEXt;
476 flags |= PNG_INFO_zTXt;
480 flags |= PNG_INFO_iTXt;
483 fprintf(stderr, "%s(%s): unknown text compression %d\n", d->file,
484 d->test, text[ntext].compression);
492 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
494 read_callback(png_structp pp, png_unknown_chunkp pc)
496 /* This function mimics the behavior of png_set_keep_unknown_chunks by
497 * returning '0' to keep the chunk and '1' to discard it.
499 display *d = voidcast(display*, png_get_user_chunk_ptr(pp));
500 int chunk = findb(pc->name);
503 if (chunk < 0) /* not one in our list, so not a known chunk */
508 keep = chunk_info[chunk].keep;
509 if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
511 /* See the comments in png.h - use the default for unknown chunks,
512 * do not keep known chunks.
514 if (chunk_info[chunk].unknown)
518 keep = PNG_HANDLE_CHUNK_NEVER;
525 fprintf(stderr, "%s(%s): %d: unrecognized chunk option\n", d->file,
526 d->test, chunk_info[chunk].keep);
529 case PNG_HANDLE_CHUNK_AS_DEFAULT:
530 case PNG_HANDLE_CHUNK_NEVER:
531 discard = 1/*handled; discard*/;
534 case PNG_HANDLE_CHUNK_IF_SAFE:
535 case PNG_HANDLE_CHUNK_ALWAYS:
536 discard = 0/*not handled; keep*/;
540 /* Also store information about this chunk in the display, the relevant flag
541 * is set if the chunk is to be kept ('not handled'.)
543 if (chunk >= 0) if (!discard) /* stupidity to stop a GCC warning */
545 png_uint_32 flag = chunk_info[chunk].flag;
547 if (pc->location & PNG_AFTER_IDAT)
548 d->after_IDAT |= flag;
551 d->before_IDAT |= flag;
554 /* However if there is no support to store unknown chunks don't ask libpng to
555 * do it; there will be an png_error.
557 # ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
560 return 1; /*handled; discard*/
563 #endif /* READ_USER_CHUNKS_SUPPORTED */
565 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
567 get_unknown(display *d, png_infop info_ptr, int after_IDAT)
569 /* Create corresponding 'unknown' flags */
570 png_uint_32 flags = 0;
575 png_unknown_chunkp unknown;
576 int num_unknown = png_get_unknown_chunks(d->png_ptr, info_ptr, &unknown);
578 while (--num_unknown >= 0)
580 int chunk = findb(unknown[num_unknown].name);
582 /* Chunks not known to pngunknown must be validated here; since they
583 * must also be unknown to libpng the 'display->keep' behavior should
586 if (chunk < 0) switch (d->keep)
588 default: /* impossible */
589 case PNG_HANDLE_CHUNK_AS_DEFAULT:
590 case PNG_HANDLE_CHUNK_NEVER:
591 fprintf(stderr, "%s(%s): %s: %s: unknown chunk saved\n",
592 d->file, d->test, d->keep ? "discard" : "default",
593 unknown[num_unknown].name);
597 case PNG_HANDLE_CHUNK_IF_SAFE:
598 if (!ancillaryb(unknown[num_unknown].name))
601 "%s(%s): if-safe: %s: unknown critical chunk saved\n",
602 d->file, d->test, unknown[num_unknown].name);
606 /* FALL THROUGH (safe) */
607 case PNG_HANDLE_CHUNK_ALWAYS:
612 flags |= chunk_info[chunk].flag;
620 get_unknown(display *d, png_infop info_ptr, int after_IDAT)
621 /* Otherwise this will return the cached values set by any user callback */
626 return d->after_IDAT;
629 return d->before_IDAT;
632 # ifndef PNG_READ_USER_CHUNKS_SUPPORTED
633 /* The #defines above should mean this is never reached, it's just here as
634 * a check to ensure the logic is correct.
636 # error No store support and no user chunk support, this will not work
641 check(FILE *fp, int argc, const char **argv, png_uint_32p flags/*out*/,
642 display *d, int set_callback)
644 int i, npasses, ipass;
647 d->keep = PNG_HANDLE_CHUNK_AS_DEFAULT;
651 /* Some of these errors are permanently fatal and cause an exit here, others
652 * are per-test and cause an error return.
654 d->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, d, error,
656 if (d->png_ptr == NULL)
658 fprintf(stderr, "%s(%s): could not allocate png struct\n", d->file,
660 /* Terminate here, this error is not test specific. */
664 d->info_ptr = png_create_info_struct(d->png_ptr);
665 d->end_ptr = png_create_info_struct(d->png_ptr);
666 if (d->info_ptr == NULL || d->end_ptr == NULL)
668 fprintf(stderr, "%s(%s): could not allocate png info\n", d->file,
674 png_init_io(d->png_ptr, fp);
676 # ifdef PNG_READ_USER_CHUNKS_SUPPORTED
677 /* This is only done if requested by the caller; it interferes with the
678 * standard store/save mechanism.
681 png_set_read_user_chunk_fn(d->png_ptr, d, read_callback);
686 /* Handle each argument in turn; multiple settings are possible for the same
687 * chunk and multiple calls will occur (the last one should override all
690 for (i=0; i<argc; ++i)
692 const char *equals = strchr(argv[i], '=');
698 if (strcmp(equals+1, "default") == 0)
699 option = PNG_HANDLE_CHUNK_AS_DEFAULT;
700 else if (strcmp(equals+1, "discard") == 0)
701 option = PNG_HANDLE_CHUNK_NEVER;
702 else if (strcmp(equals+1, "if-safe") == 0)
703 option = PNG_HANDLE_CHUNK_IF_SAFE;
704 else if (strcmp(equals+1, "save") == 0)
705 option = PNG_HANDLE_CHUNK_ALWAYS;
708 fprintf(stderr, "%s(%s): %s: unrecognized chunk option\n", d->file,
713 switch (equals - argv[i])
715 case 4: /* chunk name */
716 chunk = find(argv[i]);
720 /* These #if tests have the effect of skipping the arguments
721 * if SAVE support is unavailable - we can't do a useful test
722 * in this case, so we just check the arguments! This could
723 * be improved in the future by using the read callback.
727 memcpy(name, chunk_info[chunk].name, 5);
728 png_set_keep_unknown_chunks(d->png_ptr, option, name, 1);
729 chunk_info[chunk].keep = option;
735 case 7: /* default */
736 if (memcmp(argv[i], "default", 7) == 0)
738 png_set_keep_unknown_chunks(d->png_ptr, option, NULL, 0);
746 if (memcmp(argv[i], "all", 3) == 0)
748 png_set_keep_unknown_chunks(d->png_ptr, option, NULL, -1);
751 for (chunk = 0; chunk < NINFO; ++chunk)
752 if (chunk_info[chunk].all)
753 chunk_info[chunk].keep = option;
759 default: /* some misplaced = */
765 fprintf(stderr, "%s(%s): %s: unrecognized chunk argument\n", d->file,
770 png_read_info(d->png_ptr, d->info_ptr);
772 switch (png_get_interlace_type(d->png_ptr, d->info_ptr))
774 case PNG_INTERLACE_NONE:
778 case PNG_INTERLACE_ADAM7:
779 npasses = PNG_INTERLACE_ADAM7_PASSES;
783 /* Hard error because it is not test specific */
784 fprintf(stderr, "%s(%s): invalid interlace type\n", d->file, d->test);
789 /* Skip the image data, if IDAT is not being handled then don't do this
790 * because it will cause a CRC error.
792 if (chunk_info[0/*IDAT*/].keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
794 png_start_read_image(d->png_ptr);
795 height = png_get_image_height(d->png_ptr, d->info_ptr);
799 png_uint_32 width = png_get_image_width(d->png_ptr, d->info_ptr);
801 for (ipass=0; ipass<npasses; ++ipass)
803 png_uint_32 wPass = PNG_PASS_COLS(width, ipass);
809 for (y=0; y<height; ++y) if (PNG_ROW_IN_INTERLACE_PASS(y, ipass))
810 png_read_row(d->png_ptr, NULL, NULL);
815 else /* not interlaced */
819 for (y=0; y<height; ++y)
820 png_read_row(d->png_ptr, NULL, NULL);
824 png_read_end(d->png_ptr, d->end_ptr);
826 flags[0] = get_valid(d, d->info_ptr);
827 flags[1] = get_unknown(d, d->info_ptr, 0/*before IDAT*/);
829 /* Only png_read_png sets PNG_INFO_IDAT! */
830 flags[chunk_info[0/*IDAT*/].keep != PNG_HANDLE_CHUNK_AS_DEFAULT] |=
833 flags[2] = get_valid(d, d->end_ptr);
834 flags[3] = get_unknown(d, d->end_ptr, 1/*after IDAT*/);
842 check_error(display *d, png_uint_32 flags, const char *message)
846 png_uint_32 flag = flags & -(png_int_32)flags;
847 int i = find_by_flag(flag);
849 fprintf(stderr, "%s(%s): chunk %s: %s\n", d->file, d->test,
850 chunk_info[i].name, message);
858 check_handling(display *d, int def, png_uint_32 chunks, png_uint_32 known,
859 png_uint_32 unknown, const char *position, int set_callback)
863 png_uint_32 flag = chunks & -(png_int_32)chunks;
864 int i = find_by_flag(flag);
865 int keep = chunk_info[i].keep;
867 const char *errorx = NULL;
869 if (chunk_info[i].unknown)
871 if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
873 type = "UNKNOWN (default)";
878 type = "UNKNOWN (specified)";
881 errorx = "chunk processed";
885 case PNG_HANDLE_CHUNK_AS_DEFAULT:
887 errorx = "DEFAULT: unknown chunk saved";
890 case PNG_HANDLE_CHUNK_NEVER:
892 errorx = "DISCARD: unknown chunk saved";
895 case PNG_HANDLE_CHUNK_IF_SAFE:
896 if (ancillary(chunk_info[i].name))
898 if (!(flag & unknown))
899 errorx = "IF-SAFE: unknown ancillary chunk lost";
902 else if (flag & unknown)
903 errorx = "IF-SAFE: unknown critical chunk saved";
906 case PNG_HANDLE_CHUNK_ALWAYS:
907 if (!(flag & unknown))
908 errorx = "SAVE: unknown chunk lost";
912 errorx = "internal error: bad keep";
915 } /* unknown chunk */
917 else /* known chunk */
923 /* chunk was processed, it won't have been saved because that is
924 * caught below when checking for inconsistent processing.
926 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
927 errorx = "!DEFAULT: known chunk processed";
930 else /* not processed */ switch (keep)
932 case PNG_HANDLE_CHUNK_AS_DEFAULT:
933 errorx = "DEFAULT: known chunk not processed";
936 case PNG_HANDLE_CHUNK_NEVER:
938 errorx = "DISCARD: known chunk saved";
941 case PNG_HANDLE_CHUNK_IF_SAFE:
942 if (ancillary(chunk_info[i].name))
944 if (!(flag & unknown))
945 errorx = "IF-SAFE: known ancillary chunk lost";
948 else if (flag & unknown)
949 errorx = "IF-SAFE: known critical chunk saved";
952 case PNG_HANDLE_CHUNK_ALWAYS:
953 if (!(flag & unknown))
954 errorx = "SAVE: known chunk lost";
958 errorx = "internal error: bad keep (2)";
966 fprintf(stderr, "%s(%s%s): %s %s %s: %s\n", d->file, d->test,
967 set_callback ? ",callback" : "",
968 type, chunk_info[i].name, position, errorx);
976 perform_one_test(FILE *fp, int argc, const char **argv,
977 png_uint_32 *default_flags, display *d, int set_callback)
980 png_uint_32 flags[2][4];
984 memcpy(flags[0], default_flags, sizeof flags[0]);
986 def = check(fp, argc, argv, flags[1], d, set_callback);
988 /* Chunks should either be known or unknown, never both and this should apply
989 * whether the chunk is before or after the IDAT (actually, the app can
990 * probably change this by swapping the handling after the image, but this
991 * test does not do that.)
993 check_error(d, (flags[0][0]|flags[0][2]) & (flags[0][1]|flags[0][3]),
994 "chunk handled inconsistently in count tests");
995 check_error(d, (flags[1][0]|flags[1][2]) & (flags[1][1]|flags[1][3]),
996 "chunk handled inconsistently in option tests");
998 /* Now find out what happened to each chunk before and after the IDAT and
999 * determine if the behavior was correct. First some basic sanity checks,
1000 * any known chunk should be known in the original count, any unknown chunk
1001 * should be either known or unknown in the original.
1006 test = flags[1][0] & ~flags[0][0];
1007 check_error(d, test, "new known chunk before IDAT");
1008 test = flags[1][1] & ~(flags[0][0] | flags[0][1]);
1009 check_error(d, test, "new unknown chunk before IDAT");
1010 test = flags[1][2] & ~flags[0][2];
1011 check_error(d, test, "new known chunk after IDAT");
1012 test = flags[1][3] & ~(flags[0][2] | flags[0][3]);
1013 check_error(d, test, "new unknown chunk after IDAT");
1016 /* Now each chunk in the original list should have been handled according to
1017 * the options set for that chunk, regardless of whether libpng knows about
1020 check_handling(d, def, flags[0][0] | flags[0][1], flags[1][0], flags[1][1],
1021 "before IDAT", set_callback);
1022 check_handling(d, def, flags[0][2] | flags[0][3], flags[1][2], flags[1][3],
1023 "after IDAT", set_callback);
1027 perform_one_test_safe(FILE *fp, int argc, const char **argv,
1028 png_uint_32 *default_flags, display *d, const char *test)
1030 if (setjmp(d->error_return) == 0)
1032 d->test = test; /* allow use of d->error_return */
1033 # ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
1034 perform_one_test(fp, argc, argv, default_flags, d, 0);
1036 # ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1037 perform_one_test(fp, argc, argv, default_flags, d, 1);
1039 d->test = init; /* prevent use of d->error_return */
1043 static const char *standard_tests[] =
1045 "discard", "default=discard", 0,
1046 "save", "default=save", 0,
1047 "if-safe", "default=if-safe", 0,
1048 "vpAg", "vpAg=if-safe", 0,
1049 "sTER", "sTER=if-safe", 0,
1050 "IDAT", "default=discard", "IDAT=save", 0,
1051 "sAPI", "bKGD=save", "cHRM=save", "gAMA=save", "all=discard", "iCCP=save",
1052 "sBIT=save", "sRGB=save", 0,
1056 static PNG_NORETURN void
1057 usage(const char *program, const char *reason)
1059 fprintf(stderr, "pngunknown: %s: usage:\n %s [--strict] "
1060 "--default|{(CHNK|default|all)=(default|discard|if-safe|save)} "
1061 "testfile.png\n", reason, program);
1066 main(int argc, const char **argv)
1069 png_uint_32 default_flags[4/*valid,unknown{before,after}*/];
1070 int strict = 0, default_tests = 0;
1071 const char *count_argv = "default=save";
1072 const char *touch_file = NULL;
1075 init_display(&d, argv[0]);
1077 while (++argv, --argc > 0)
1079 if (strcmp(*argv, "--strict") == 0)
1082 else if (strcmp(*argv, "--default") == 0)
1085 else if (strcmp(*argv, "--touch") == 0)
1088 touch_file = *++argv, --argc;
1091 usage(d.program, "--touch: missing file name");
1098 /* A file name is required, but there should be no other arguments if
1099 * --default was specified.
1102 usage(d.program, "missing test file");
1104 /* GCC BUG: if (default_tests && argc != 1) triggers some weird GCC argc
1105 * optimization which causes warnings with -Wstrict-overflow!
1107 else if (default_tests) if (argc != 1)
1108 usage(d.program, "extra arguments");
1110 /* The name of the test file is the last argument; remove it. */
1111 d.file = argv[--argc];
1113 fp = fopen(d.file, "rb");
1120 /* First find all the chunks, known and unknown, in the test file, a failure
1121 * here aborts the whole test.
1123 * If 'save' is supported then the normal saving method should happen,
1124 * otherwise if 'read' is supported then the read callback will do the
1125 * same thing. If both are supported the 'read' callback won't be
1126 * instantiated by default. If 'save' is *not* supported then a user
1127 * callback is required even though we can call png_get_unknown_chunks.
1129 if (check(fp, 1, &count_argv, default_flags, &d,
1130 # ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
1135 ) != PNG_HANDLE_CHUNK_ALWAYS)
1137 fprintf(stderr, "%s: %s: internal error\n", d.program, d.file);
1141 /* Now find what the various supplied options cause to change: */
1144 d.test = cmd; /* acts as a flag to say exit, do not longjmp */
1145 # ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
1146 perform_one_test(fp, argc, argv, default_flags, &d, 0);
1148 # ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1149 perform_one_test(fp, argc, argv, default_flags, &d, 1);
1156 const char **test = standard_tests;
1158 /* Set the exit_test pointer here so we can continue after a libpng error.
1159 * NOTE: this leaks memory because the png_struct data from the failing
1160 * test is never freed.
1164 const char *this_test = *test++;
1165 const char **next = test;
1166 int count = display_rc(&d, strict), new_count;
1170 while (*next) ++next, ++arg_count;
1172 perform_one_test_safe(fp, arg_count, test, default_flags, &d,
1175 new_count = display_rc(&d, strict);
1177 if (new_count == count)
1183 printf("%s: %s %s\n", result, d.program, this_test);
1191 if (display_rc(&d, strict) == 0)
1193 /* Success, touch the success file if appropriate */
1194 if (touch_file != NULL)
1196 FILE *fsuccess = fopen(touch_file, "wt");
1198 if (fsuccess != NULL)
1201 fprintf(fsuccess, "PNG unknown tests succeeded\n");
1203 err = ferror(fsuccess);
1205 if (fclose(fsuccess) || err)
1207 fprintf(stderr, "%s: write failed\n", touch_file);
1214 fprintf(stderr, "%s: open failed\n", touch_file);
1225 #else /* !(READ_USER_CHUNKS || SAVE_UNKNOWN_CHUNKS) */
1230 " test ignored: no support to find out about unknown chunks\n");
1231 /* So the test is skipped: */
1234 #endif /* READ_USER_CHUNKS || SAVE_UNKNOWN_CHUNKS */
1236 #else /* !(SET_UNKNOWN_CHUNKS && READ) */
1241 " test ignored: no support to modify unknown chunk handling\n");
1242 /* So the test is skipped: */
1245 #endif /* SET_UNKNOWN_CHUNKS && READ*/