src/third-party/libpng/pngset.c (view raw)
1
2/* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.6.17 [March 26, 2015]
5 * Copyright (c) 1998-2015 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 *
13 * The functions here are used during reads to store data from the file
14 * into the info struct, and during writes to store application data
15 * into the info struct for writing into the file. This abstracts the
16 * info struct and allows us to change the structure in the future.
17 */
18
19#include "pngpriv.h"
20
21#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
22
23#ifdef PNG_bKGD_SUPPORTED
24void PNGAPI
25png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
26 png_const_color_16p background)
27{
28 png_debug1(1, "in %s storage function", "bKGD");
29
30 if (png_ptr == NULL || info_ptr == NULL || background == NULL)
31 return;
32
33 info_ptr->background = *background;
34 info_ptr->valid |= PNG_INFO_bKGD;
35}
36#endif
37
38#ifdef PNG_cHRM_SUPPORTED
39void PNGFAPI
40png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
41 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
42 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
43 png_fixed_point blue_x, png_fixed_point blue_y)
44{
45 png_xy xy;
46
47 png_debug1(1, "in %s storage function", "cHRM fixed");
48
49 if (png_ptr == NULL || info_ptr == NULL)
50 return;
51
52 xy.redx = red_x;
53 xy.redy = red_y;
54 xy.greenx = green_x;
55 xy.greeny = green_y;
56 xy.bluex = blue_x;
57 xy.bluey = blue_y;
58 xy.whitex = white_x;
59 xy.whitey = white_y;
60
61 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
62 2/* override with app values*/) != 0)
63 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
64
65 png_colorspace_sync_info(png_ptr, info_ptr);
66}
67
68void PNGFAPI
69png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
70 png_fixed_point int_red_X, png_fixed_point int_red_Y,
71 png_fixed_point int_red_Z, png_fixed_point int_green_X,
72 png_fixed_point int_green_Y, png_fixed_point int_green_Z,
73 png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
74 png_fixed_point int_blue_Z)
75{
76 png_XYZ XYZ;
77
78 png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
79
80 if (png_ptr == NULL || info_ptr == NULL)
81 return;
82
83 XYZ.red_X = int_red_X;
84 XYZ.red_Y = int_red_Y;
85 XYZ.red_Z = int_red_Z;
86 XYZ.green_X = int_green_X;
87 XYZ.green_Y = int_green_Y;
88 XYZ.green_Z = int_green_Z;
89 XYZ.blue_X = int_blue_X;
90 XYZ.blue_Y = int_blue_Y;
91 XYZ.blue_Z = int_blue_Z;
92
93 if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace,
94 &XYZ, 2) != 0)
95 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
96
97 png_colorspace_sync_info(png_ptr, info_ptr);
98}
99
100# ifdef PNG_FLOATING_POINT_SUPPORTED
101void PNGAPI
102png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
103 double white_x, double white_y, double red_x, double red_y,
104 double green_x, double green_y, double blue_x, double blue_y)
105{
106 png_set_cHRM_fixed(png_ptr, info_ptr,
107 png_fixed(png_ptr, white_x, "cHRM White X"),
108 png_fixed(png_ptr, white_y, "cHRM White Y"),
109 png_fixed(png_ptr, red_x, "cHRM Red X"),
110 png_fixed(png_ptr, red_y, "cHRM Red Y"),
111 png_fixed(png_ptr, green_x, "cHRM Green X"),
112 png_fixed(png_ptr, green_y, "cHRM Green Y"),
113 png_fixed(png_ptr, blue_x, "cHRM Blue X"),
114 png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
115}
116
117void PNGAPI
118png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
119 double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
120 double blue_X, double blue_Y, double blue_Z)
121{
122 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
123 png_fixed(png_ptr, red_X, "cHRM Red X"),
124 png_fixed(png_ptr, red_Y, "cHRM Red Y"),
125 png_fixed(png_ptr, red_Z, "cHRM Red Z"),
126 png_fixed(png_ptr, green_X, "cHRM Red X"),
127 png_fixed(png_ptr, green_Y, "cHRM Red Y"),
128 png_fixed(png_ptr, green_Z, "cHRM Red Z"),
129 png_fixed(png_ptr, blue_X, "cHRM Red X"),
130 png_fixed(png_ptr, blue_Y, "cHRM Red Y"),
131 png_fixed(png_ptr, blue_Z, "cHRM Red Z"));
132}
133# endif /* FLOATING_POINT */
134
135#endif /* cHRM */
136
137#ifdef PNG_gAMA_SUPPORTED
138void PNGFAPI
139png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
140 png_fixed_point file_gamma)
141{
142 png_debug1(1, "in %s storage function", "gAMA");
143
144 if (png_ptr == NULL || info_ptr == NULL)
145 return;
146
147 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
148 png_colorspace_sync_info(png_ptr, info_ptr);
149}
150
151# ifdef PNG_FLOATING_POINT_SUPPORTED
152void PNGAPI
153png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
154{
155 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
156 "png_set_gAMA"));
157}
158# endif
159#endif
160
161#ifdef PNG_hIST_SUPPORTED
162void PNGAPI
163png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
164 png_const_uint_16p hist)
165{
166 int i;
167
168 png_debug1(1, "in %s storage function", "hIST");
169
170 if (png_ptr == NULL || info_ptr == NULL)
171 return;
172
173 if (info_ptr->num_palette == 0 || info_ptr->num_palette
174 > PNG_MAX_PALETTE_LENGTH)
175 {
176 png_warning(png_ptr,
177 "Invalid palette size, hIST allocation skipped");
178
179 return;
180 }
181
182 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
183
184 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
185 * version 1.2.1
186 */
187 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
188 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
189
190 if (info_ptr->hist == NULL)
191 {
192 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
193
194 return;
195 }
196
197 info_ptr->free_me |= PNG_FREE_HIST;
198
199 for (i = 0; i < info_ptr->num_palette; i++)
200 info_ptr->hist[i] = hist[i];
201
202 info_ptr->valid |= PNG_INFO_hIST;
203}
204#endif
205
206void PNGAPI
207png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
208 png_uint_32 width, png_uint_32 height, int bit_depth,
209 int color_type, int interlace_type, int compression_type,
210 int filter_type)
211{
212 png_debug1(1, "in %s storage function", "IHDR");
213
214 if (png_ptr == NULL || info_ptr == NULL)
215 return;
216
217 info_ptr->width = width;
218 info_ptr->height = height;
219 info_ptr->bit_depth = (png_byte)bit_depth;
220 info_ptr->color_type = (png_byte)color_type;
221 info_ptr->compression_type = (png_byte)compression_type;
222 info_ptr->filter_type = (png_byte)filter_type;
223 info_ptr->interlace_type = (png_byte)interlace_type;
224
225 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
226 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
227 info_ptr->compression_type, info_ptr->filter_type);
228
229 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
230 info_ptr->channels = 1;
231
232 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
233 info_ptr->channels = 3;
234
235 else
236 info_ptr->channels = 1;
237
238 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
239 info_ptr->channels++;
240
241 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
242
243 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
244}
245
246#ifdef PNG_oFFs_SUPPORTED
247void PNGAPI
248png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
249 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
250{
251 png_debug1(1, "in %s storage function", "oFFs");
252
253 if (png_ptr == NULL || info_ptr == NULL)
254 return;
255
256 info_ptr->x_offset = offset_x;
257 info_ptr->y_offset = offset_y;
258 info_ptr->offset_unit_type = (png_byte)unit_type;
259 info_ptr->valid |= PNG_INFO_oFFs;
260}
261#endif
262
263#ifdef PNG_pCAL_SUPPORTED
264void PNGAPI
265png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
266 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
267 int nparams, png_const_charp units, png_charpp params)
268{
269 png_size_t length;
270 int i;
271
272 png_debug1(1, "in %s storage function", "pCAL");
273
274 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
275 || (nparams > 0 && params == NULL))
276 return;
277
278 length = strlen(purpose) + 1;
279 png_debug1(3, "allocating purpose for info (%lu bytes)",
280 (unsigned long)length);
281
282 /* TODO: validate format of calibration name and unit name */
283
284 /* Check that the type matches the specification. */
285 if (type < 0 || type > 3)
286 png_error(png_ptr, "Invalid pCAL equation type");
287
288 if (nparams < 0 || nparams > 255)
289 png_error(png_ptr, "Invalid pCAL parameter count");
290
291 /* Validate params[nparams] */
292 for (i=0; i<nparams; ++i)
293 {
294 if (params[i] == NULL ||
295 !png_check_fp_string(params[i], strlen(params[i])))
296 png_error(png_ptr, "Invalid format for pCAL parameter");
297 }
298
299 info_ptr->pcal_purpose = png_voidcast(png_charp,
300 png_malloc_warn(png_ptr, length));
301
302 if (info_ptr->pcal_purpose == NULL)
303 {
304 png_warning(png_ptr, "Insufficient memory for pCAL purpose");
305
306 return;
307 }
308
309 memcpy(info_ptr->pcal_purpose, purpose, length);
310
311 png_debug(3, "storing X0, X1, type, and nparams in info");
312 info_ptr->pcal_X0 = X0;
313 info_ptr->pcal_X1 = X1;
314 info_ptr->pcal_type = (png_byte)type;
315 info_ptr->pcal_nparams = (png_byte)nparams;
316
317 length = strlen(units) + 1;
318 png_debug1(3, "allocating units for info (%lu bytes)",
319 (unsigned long)length);
320
321 info_ptr->pcal_units = png_voidcast(png_charp,
322 png_malloc_warn(png_ptr, length));
323
324 if (info_ptr->pcal_units == NULL)
325 {
326 png_warning(png_ptr, "Insufficient memory for pCAL units");
327
328 return;
329 }
330
331 memcpy(info_ptr->pcal_units, units, length);
332
333 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
334 (png_size_t)((nparams + 1) * (sizeof (png_charp)))));
335
336 if (info_ptr->pcal_params == NULL)
337 {
338 png_warning(png_ptr, "Insufficient memory for pCAL params");
339
340 return;
341 }
342
343 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
344
345 for (i = 0; i < nparams; i++)
346 {
347 length = strlen(params[i]) + 1;
348 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
349 (unsigned long)length);
350
351 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
352
353 if (info_ptr->pcal_params[i] == NULL)
354 {
355 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
356
357 return;
358 }
359
360 memcpy(info_ptr->pcal_params[i], params[i], length);
361 }
362
363 info_ptr->valid |= PNG_INFO_pCAL;
364 info_ptr->free_me |= PNG_FREE_PCAL;
365}
366#endif
367
368#ifdef PNG_sCAL_SUPPORTED
369void PNGAPI
370png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
371 int unit, png_const_charp swidth, png_const_charp sheight)
372{
373 png_size_t lengthw = 0, lengthh = 0;
374
375 png_debug1(1, "in %s storage function", "sCAL");
376
377 if (png_ptr == NULL || info_ptr == NULL)
378 return;
379
380 /* Double check the unit (should never get here with an invalid
381 * unit unless this is an API call.)
382 */
383 if (unit != 1 && unit != 2)
384 png_error(png_ptr, "Invalid sCAL unit");
385
386 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
387 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
388 png_error(png_ptr, "Invalid sCAL width");
389
390 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
391 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
392 png_error(png_ptr, "Invalid sCAL height");
393
394 info_ptr->scal_unit = (png_byte)unit;
395
396 ++lengthw;
397
398 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
399
400 info_ptr->scal_s_width = png_voidcast(png_charp,
401 png_malloc_warn(png_ptr, lengthw));
402
403 if (info_ptr->scal_s_width == NULL)
404 {
405 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
406
407 return;
408 }
409
410 memcpy(info_ptr->scal_s_width, swidth, lengthw);
411
412 ++lengthh;
413
414 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
415
416 info_ptr->scal_s_height = png_voidcast(png_charp,
417 png_malloc_warn(png_ptr, lengthh));
418
419 if (info_ptr->scal_s_height == NULL)
420 {
421 png_free (png_ptr, info_ptr->scal_s_width);
422 info_ptr->scal_s_width = NULL;
423
424 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
425
426 return;
427 }
428
429 memcpy(info_ptr->scal_s_height, sheight, lengthh);
430
431 info_ptr->valid |= PNG_INFO_sCAL;
432 info_ptr->free_me |= PNG_FREE_SCAL;
433}
434
435# ifdef PNG_FLOATING_POINT_SUPPORTED
436void PNGAPI
437png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
438 double width, double height)
439{
440 png_debug1(1, "in %s storage function", "sCAL");
441
442 /* Check the arguments. */
443 if (width <= 0)
444 png_warning(png_ptr, "Invalid sCAL width ignored");
445
446 else if (height <= 0)
447 png_warning(png_ptr, "Invalid sCAL height ignored");
448
449 else
450 {
451 /* Convert 'width' and 'height' to ASCII. */
452 char swidth[PNG_sCAL_MAX_DIGITS+1];
453 char sheight[PNG_sCAL_MAX_DIGITS+1];
454
455 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
456 PNG_sCAL_PRECISION);
457 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
458 PNG_sCAL_PRECISION);
459
460 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
461 }
462}
463# endif
464
465# ifdef PNG_FIXED_POINT_SUPPORTED
466void PNGAPI
467png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
468 png_fixed_point width, png_fixed_point height)
469{
470 png_debug1(1, "in %s storage function", "sCAL");
471
472 /* Check the arguments. */
473 if (width <= 0)
474 png_warning(png_ptr, "Invalid sCAL width ignored");
475
476 else if (height <= 0)
477 png_warning(png_ptr, "Invalid sCAL height ignored");
478
479 else
480 {
481 /* Convert 'width' and 'height' to ASCII. */
482 char swidth[PNG_sCAL_MAX_DIGITS+1];
483 char sheight[PNG_sCAL_MAX_DIGITS+1];
484
485 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
486 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
487
488 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
489 }
490}
491# endif
492#endif
493
494#ifdef PNG_pHYs_SUPPORTED
495void PNGAPI
496png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
497 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
498{
499 png_debug1(1, "in %s storage function", "pHYs");
500
501 if (png_ptr == NULL || info_ptr == NULL)
502 return;
503
504 info_ptr->x_pixels_per_unit = res_x;
505 info_ptr->y_pixels_per_unit = res_y;
506 info_ptr->phys_unit_type = (png_byte)unit_type;
507 info_ptr->valid |= PNG_INFO_pHYs;
508}
509#endif
510
511void PNGAPI
512png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
513 png_const_colorp palette, int num_palette)
514{
515
516 png_debug1(1, "in %s storage function", "PLTE");
517
518 if (png_ptr == NULL || info_ptr == NULL)
519 return;
520
521 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
522 {
523 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
524 png_error(png_ptr, "Invalid palette length");
525
526 else
527 {
528 png_warning(png_ptr, "Invalid palette length");
529
530 return;
531 }
532 }
533
534 if ((num_palette > 0 && palette == NULL) ||
535 (num_palette == 0
536# ifdef PNG_MNG_FEATURES_SUPPORTED
537 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
538# endif
539 ))
540 {
541 png_error(png_ptr, "Invalid palette");
542 }
543
544 /* It may not actually be necessary to set png_ptr->palette here;
545 * we do it for backward compatibility with the way the png_handle_tRNS
546 * function used to do the allocation.
547 *
548 * 1.6.0: the above statement appears to be incorrect; something has to set
549 * the palette inside png_struct on read.
550 */
551 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
552
553 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
554 * of num_palette entries, in case of an invalid PNG file that has
555 * too-large sample values.
556 */
557 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
558 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
559
560 if (num_palette > 0)
561 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
562 info_ptr->palette = png_ptr->palette;
563 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
564
565 info_ptr->free_me |= PNG_FREE_PLTE;
566
567 info_ptr->valid |= PNG_INFO_PLTE;
568}
569
570#ifdef PNG_sBIT_SUPPORTED
571void PNGAPI
572png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
573 png_const_color_8p sig_bit)
574{
575 png_debug1(1, "in %s storage function", "sBIT");
576
577 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
578 return;
579
580 info_ptr->sig_bit = *sig_bit;
581 info_ptr->valid |= PNG_INFO_sBIT;
582}
583#endif
584
585#ifdef PNG_sRGB_SUPPORTED
586void PNGAPI
587png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
588{
589 png_debug1(1, "in %s storage function", "sRGB");
590
591 if (png_ptr == NULL || info_ptr == NULL)
592 return;
593
594 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
595 png_colorspace_sync_info(png_ptr, info_ptr);
596}
597
598void PNGAPI
599png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
600 int srgb_intent)
601{
602 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
603
604 if (png_ptr == NULL || info_ptr == NULL)
605 return;
606
607 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
608 srgb_intent) != 0)
609 {
610 /* This causes the gAMA and cHRM to be written too */
611 info_ptr->colorspace.flags |=
612 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
613 }
614
615 png_colorspace_sync_info(png_ptr, info_ptr);
616}
617#endif /* sRGB */
618
619
620#ifdef PNG_iCCP_SUPPORTED
621void PNGAPI
622png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
623 png_const_charp name, int compression_type,
624 png_const_bytep profile, png_uint_32 proflen)
625{
626 png_charp new_iccp_name;
627 png_bytep new_iccp_profile;
628 png_size_t length;
629
630 png_debug1(1, "in %s storage function", "iCCP");
631
632 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
633 return;
634
635 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
636 png_app_error(png_ptr, "Invalid iCCP compression method");
637
638 /* Set the colorspace first because this validates the profile; do not
639 * override previously set app cHRM or gAMA here (because likely as not the
640 * application knows better than libpng what the correct values are.) Pass
641 * the info_ptr color_type field to png_colorspace_set_ICC because in the
642 * write case it has not yet been stored in png_ptr.
643 */
644 {
645 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
646 proflen, profile, info_ptr->color_type);
647
648 png_colorspace_sync_info(png_ptr, info_ptr);
649
650 /* Don't do any of the copying if the profile was bad, or inconsistent. */
651 if (result == 0)
652 return;
653
654 /* But do write the gAMA and cHRM chunks from the profile. */
655 info_ptr->colorspace.flags |=
656 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
657 }
658
659 length = strlen(name)+1;
660 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
661
662 if (new_iccp_name == NULL)
663 {
664 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
665
666 return;
667 }
668
669 memcpy(new_iccp_name, name, length);
670 new_iccp_profile = png_voidcast(png_bytep,
671 png_malloc_warn(png_ptr, proflen));
672
673 if (new_iccp_profile == NULL)
674 {
675 png_free(png_ptr, new_iccp_name);
676 new_iccp_name = NULL;
677 png_benign_error(png_ptr,
678 "Insufficient memory to process iCCP profile");
679
680 return;
681 }
682
683 memcpy(new_iccp_profile, profile, proflen);
684
685 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
686
687 info_ptr->iccp_proflen = proflen;
688 info_ptr->iccp_name = new_iccp_name;
689 info_ptr->iccp_profile = new_iccp_profile;
690 info_ptr->free_me |= PNG_FREE_ICCP;
691 info_ptr->valid |= PNG_INFO_iCCP;
692}
693#endif
694
695#ifdef PNG_TEXT_SUPPORTED
696void PNGAPI
697png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
698 png_const_textp text_ptr, int num_text)
699{
700 int ret;
701 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
702
703 if (ret != 0)
704 png_error(png_ptr, "Insufficient memory to store text");
705}
706
707int /* PRIVATE */
708png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
709 png_const_textp text_ptr, int num_text)
710{
711 int i;
712
713 png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :
714 (unsigned long)png_ptr->chunk_name);
715
716 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
717 return(0);
718
719 /* Make sure we have enough space in the "text" array in info_struct
720 * to hold all of the incoming text_ptr objects. This compare can't overflow
721 * because max_text >= num_text (anyway, subtract of two positive integers
722 * can't overflow in any case.)
723 */
724 if (num_text > info_ptr->max_text - info_ptr->num_text)
725 {
726 int old_num_text = info_ptr->num_text;
727 int max_text;
728 png_textp new_text = NULL;
729
730 /* Calculate an appropriate max_text, checking for overflow. */
731 max_text = old_num_text;
732 if (num_text <= INT_MAX - max_text)
733 {
734 max_text += num_text;
735
736 /* Round up to a multiple of 8 */
737 if (max_text < INT_MAX-8)
738 max_text = (max_text + 8) & ~0x7;
739
740 else
741 max_text = INT_MAX;
742
743 /* Now allocate a new array and copy the old members in; this does all
744 * the overflow checks.
745 */
746 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
747 info_ptr->text, old_num_text, max_text-old_num_text,
748 sizeof *new_text));
749 }
750
751 if (new_text == NULL)
752 {
753 png_chunk_report(png_ptr, "too many text chunks",
754 PNG_CHUNK_WRITE_ERROR);
755
756 return 1;
757 }
758
759 png_free(png_ptr, info_ptr->text);
760
761 info_ptr->text = new_text;
762 info_ptr->free_me |= PNG_FREE_TEXT;
763 info_ptr->max_text = max_text;
764 /* num_text is adjusted below as the entries are copied in */
765
766 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
767 }
768
769 for (i = 0; i < num_text; i++)
770 {
771 size_t text_length, key_len;
772 size_t lang_len, lang_key_len;
773 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
774
775 if (text_ptr[i].key == NULL)
776 continue;
777
778 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
779 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
780 {
781 png_chunk_report(png_ptr, "text compression mode is out of range",
782 PNG_CHUNK_WRITE_ERROR);
783 continue;
784 }
785
786 key_len = strlen(text_ptr[i].key);
787
788 if (text_ptr[i].compression <= 0)
789 {
790 lang_len = 0;
791 lang_key_len = 0;
792 }
793
794 else
795# ifdef PNG_iTXt_SUPPORTED
796 {
797 /* Set iTXt data */
798
799 if (text_ptr[i].lang != NULL)
800 lang_len = strlen(text_ptr[i].lang);
801
802 else
803 lang_len = 0;
804
805 if (text_ptr[i].lang_key != NULL)
806 lang_key_len = strlen(text_ptr[i].lang_key);
807
808 else
809 lang_key_len = 0;
810 }
811# else /* iTXt */
812 {
813 png_chunk_report(png_ptr, "iTXt chunk not supported",
814 PNG_CHUNK_WRITE_ERROR);
815 continue;
816 }
817# endif
818
819 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
820 {
821 text_length = 0;
822# ifdef PNG_iTXt_SUPPORTED
823 if (text_ptr[i].compression > 0)
824 textp->compression = PNG_ITXT_COMPRESSION_NONE;
825
826 else
827# endif
828 textp->compression = PNG_TEXT_COMPRESSION_NONE;
829 }
830
831 else
832 {
833 text_length = strlen(text_ptr[i].text);
834 textp->compression = text_ptr[i].compression;
835 }
836
837 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
838 key_len + text_length + lang_len + lang_key_len + 4));
839
840 if (textp->key == NULL)
841 {
842 png_chunk_report(png_ptr, "text chunk: out of memory",
843 PNG_CHUNK_WRITE_ERROR);
844
845 return 1;
846 }
847
848 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
849 (unsigned long)(png_uint_32)
850 (key_len + lang_len + lang_key_len + text_length + 4),
851 textp->key);
852
853 memcpy(textp->key, text_ptr[i].key, key_len);
854 *(textp->key + key_len) = '\0';
855
856 if (text_ptr[i].compression > 0)
857 {
858 textp->lang = textp->key + key_len + 1;
859 memcpy(textp->lang, text_ptr[i].lang, lang_len);
860 *(textp->lang + lang_len) = '\0';
861 textp->lang_key = textp->lang + lang_len + 1;
862 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
863 *(textp->lang_key + lang_key_len) = '\0';
864 textp->text = textp->lang_key + lang_key_len + 1;
865 }
866
867 else
868 {
869 textp->lang=NULL;
870 textp->lang_key=NULL;
871 textp->text = textp->key + key_len + 1;
872 }
873
874 if (text_length != 0)
875 memcpy(textp->text, text_ptr[i].text, text_length);
876
877 *(textp->text + text_length) = '\0';
878
879# ifdef PNG_iTXt_SUPPORTED
880 if (textp->compression > 0)
881 {
882 textp->text_length = 0;
883 textp->itxt_length = text_length;
884 }
885
886 else
887# endif
888 {
889 textp->text_length = text_length;
890 textp->itxt_length = 0;
891 }
892
893 info_ptr->num_text++;
894 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
895 }
896
897 return(0);
898}
899#endif
900
901#ifdef PNG_tIME_SUPPORTED
902void PNGAPI
903png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
904 png_const_timep mod_time)
905{
906 png_debug1(1, "in %s storage function", "tIME");
907
908 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
909 (png_ptr->mode & PNG_WROTE_tIME) != 0)
910 return;
911
912 if (mod_time->month == 0 || mod_time->month > 12 ||
913 mod_time->day == 0 || mod_time->day > 31 ||
914 mod_time->hour > 23 || mod_time->minute > 59 ||
915 mod_time->second > 60)
916 {
917 png_warning(png_ptr, "Ignoring invalid time value");
918
919 return;
920 }
921
922 info_ptr->mod_time = *mod_time;
923 info_ptr->valid |= PNG_INFO_tIME;
924}
925#endif
926
927#ifdef PNG_tRNS_SUPPORTED
928void PNGAPI
929png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
930 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
931{
932 png_debug1(1, "in %s storage function", "tRNS");
933
934 if (png_ptr == NULL || info_ptr == NULL)
935
936 return;
937
938 if (trans_alpha != NULL)
939 {
940 /* It may not actually be necessary to set png_ptr->trans_alpha here;
941 * we do it for backward compatibility with the way the png_handle_tRNS
942 * function used to do the allocation.
943 *
944 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
945 * relies on png_set_tRNS storing the information in png_struct
946 * (otherwise it won't be there for the code in pngrtran.c).
947 */
948
949 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
950
951 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
952 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
953 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
954
955 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
956 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
957 }
958
959 if (trans_color != NULL)
960 {
961#ifdef PNG_WARNINGS_SUPPORTED
962 if (info_ptr->bit_depth < 16)
963 {
964 int sample_max = (1 << info_ptr->bit_depth) - 1;
965
966 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
967 trans_color->gray > sample_max) ||
968 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
969 (trans_color->red > sample_max ||
970 trans_color->green > sample_max ||
971 trans_color->blue > sample_max)))
972 png_warning(png_ptr,
973 "tRNS chunk has out-of-range samples for bit_depth");
974 }
975#endif
976
977 info_ptr->trans_color = *trans_color;
978
979 if (num_trans == 0)
980 num_trans = 1;
981 }
982
983 info_ptr->num_trans = (png_uint_16)num_trans;
984
985 if (num_trans != 0)
986 {
987 info_ptr->valid |= PNG_INFO_tRNS;
988 info_ptr->free_me |= PNG_FREE_TRNS;
989 }
990}
991#endif
992
993#ifdef PNG_sPLT_SUPPORTED
994void PNGAPI
995png_set_sPLT(png_const_structrp png_ptr,
996 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
997/*
998 * entries - array of png_sPLT_t structures
999 * to be added to the list of palettes
1000 * in the info structure.
1001 *
1002 * nentries - number of palette structures to be
1003 * added.
1004 */
1005{
1006 png_sPLT_tp np;
1007
1008 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1009 return;
1010
1011 /* Use the internal realloc function, which checks for all the possible
1012 * overflows. Notice that the parameters are (int) and (size_t)
1013 */
1014 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1015 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1016 sizeof *np));
1017
1018 if (np == NULL)
1019 {
1020 /* Out of memory or too many chunks */
1021 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1022
1023 return;
1024 }
1025
1026 png_free(png_ptr, info_ptr->splt_palettes);
1027 info_ptr->splt_palettes = np;
1028 info_ptr->free_me |= PNG_FREE_SPLT;
1029
1030 np += info_ptr->splt_palettes_num;
1031
1032 do
1033 {
1034 png_size_t length;
1035
1036 /* Skip invalid input entries */
1037 if (entries->name == NULL || entries->entries == NULL)
1038 {
1039 /* png_handle_sPLT doesn't do this, so this is an app error */
1040 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1041 /* Just skip the invalid entry */
1042 continue;
1043 }
1044
1045 np->depth = entries->depth;
1046
1047 /* In the event of out-of-memory just return - there's no point keeping
1048 * on trying to add sPLT chunks.
1049 */
1050 length = strlen(entries->name) + 1;
1051 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1052
1053 if (np->name == NULL)
1054 break;
1055
1056 memcpy(np->name, entries->name, length);
1057
1058 /* IMPORTANT: we have memory now that won't get freed if something else
1059 * goes wrong; this code must free it. png_malloc_array produces no
1060 * warnings; use a png_chunk_report (below) if there is an error.
1061 */
1062 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1063 entries->nentries, sizeof (png_sPLT_entry)));
1064
1065 if (np->entries == NULL)
1066 {
1067 png_free(png_ptr, np->name);
1068 np->name = NULL;
1069 break;
1070 }
1071
1072 np->nentries = entries->nentries;
1073 /* This multiply can't overflow because png_malloc_array has already
1074 * checked it when doing the allocation.
1075 */
1076 memcpy(np->entries, entries->entries,
1077 entries->nentries * sizeof (png_sPLT_entry));
1078
1079 /* Note that 'continue' skips the advance of the out pointer and out
1080 * count, so an invalid entry is not added.
1081 */
1082 info_ptr->valid |= PNG_INFO_sPLT;
1083 ++(info_ptr->splt_palettes_num);
1084 ++np;
1085 }
1086 while (++entries, --nentries);
1087
1088 if (nentries > 0)
1089 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1090}
1091#endif /* sPLT */
1092
1093#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1094static png_byte
1095check_location(png_const_structrp png_ptr, int location)
1096{
1097 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1098
1099 /* New in 1.6.0; copy the location and check it. This is an API
1100 * change; previously the app had to use the
1101 * png_set_unknown_chunk_location API below for each chunk.
1102 */
1103 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1104 {
1105 /* Write struct, so unknown chunks come from the app */
1106 png_app_warning(png_ptr,
1107 "png_set_unknown_chunks now expects a valid location");
1108 /* Use the old behavior */
1109 location = (png_byte)(png_ptr->mode &
1110 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1111 }
1112
1113 /* This need not be an internal error - if the app calls
1114 * png_set_unknown_chunks on a read pointer it must get the location right.
1115 */
1116 if (location == 0)
1117 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1118
1119 /* Now reduce the location to the top-most set bit by removing each least
1120 * significant bit in turn.
1121 */
1122 while (location != (location & -location))
1123 location &= ~(location & -location);
1124
1125 /* The cast is safe because 'location' is a bit mask and only the low four
1126 * bits are significant.
1127 */
1128 return (png_byte)location;
1129}
1130
1131void PNGAPI
1132png_set_unknown_chunks(png_const_structrp png_ptr,
1133 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1134{
1135 png_unknown_chunkp np;
1136
1137 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1138 unknowns == NULL)
1139 return;
1140
1141 /* Check for the failure cases where support has been disabled at compile
1142 * time. This code is hardly ever compiled - it's here because
1143 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1144 * code) but may be meaningless if the read or write handling of unknown
1145 * chunks is not compiled in.
1146 */
1147# if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1148 defined(PNG_READ_SUPPORTED)
1149 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1150 {
1151 png_app_error(png_ptr, "no unknown chunk support on read");
1152
1153 return;
1154 }
1155# endif
1156# if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1157 defined(PNG_WRITE_SUPPORTED)
1158 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1159 {
1160 png_app_error(png_ptr, "no unknown chunk support on write");
1161
1162 return;
1163 }
1164# endif
1165
1166 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1167 * unknown critical chunks could be lost with just a warning resulting in
1168 * undefined behavior. Now png_chunk_report is used to provide behavior
1169 * appropriate to read or write.
1170 */
1171 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1172 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1173 sizeof *np));
1174
1175 if (np == NULL)
1176 {
1177 png_chunk_report(png_ptr, "too many unknown chunks",
1178 PNG_CHUNK_WRITE_ERROR);
1179
1180 return;
1181 }
1182
1183 png_free(png_ptr, info_ptr->unknown_chunks);
1184 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1185 info_ptr->free_me |= PNG_FREE_UNKN;
1186
1187 np += info_ptr->unknown_chunks_num;
1188
1189 /* Increment unknown_chunks_num each time round the loop to protect the
1190 * just-allocated chunk data.
1191 */
1192 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1193 {
1194 memcpy(np->name, unknowns->name, (sizeof np->name));
1195 np->name[(sizeof np->name)-1] = '\0';
1196 np->location = check_location(png_ptr, unknowns->location);
1197
1198 if (unknowns->size == 0)
1199 {
1200 np->data = NULL;
1201 np->size = 0;
1202 }
1203
1204 else
1205 {
1206 np->data = png_voidcast(png_bytep,
1207 png_malloc_base(png_ptr, unknowns->size));
1208
1209 if (np->data == NULL)
1210 {
1211 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1212 PNG_CHUNK_WRITE_ERROR);
1213 /* But just skip storing the unknown chunk */
1214 continue;
1215 }
1216
1217 memcpy(np->data, unknowns->data, unknowns->size);
1218 np->size = unknowns->size;
1219 }
1220
1221 /* These increments are skipped on out-of-memory for the data - the
1222 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1223 * This is correct in the read case (the chunk is just dropped.)
1224 */
1225 ++np;
1226 ++(info_ptr->unknown_chunks_num);
1227 }
1228}
1229
1230void PNGAPI
1231png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1232 int chunk, int location)
1233{
1234 /* This API is pretty pointless in 1.6.0 because the location can be set
1235 * before the call to png_set_unknown_chunks.
1236 *
1237 * TODO: add a png_app_warning in 1.7
1238 */
1239 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1240 chunk < info_ptr->unknown_chunks_num)
1241 {
1242 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1243 {
1244 png_app_error(png_ptr, "invalid unknown chunk location");
1245 /* Fake out the pre 1.6.0 behavior: */
1246 if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1247 location = PNG_AFTER_IDAT;
1248
1249 else
1250 location = PNG_HAVE_IHDR; /* also undocumented */
1251 }
1252
1253 info_ptr->unknown_chunks[chunk].location =
1254 check_location(png_ptr, location);
1255 }
1256}
1257#endif /* STORE_UNKNOWN_CHUNKS */
1258
1259#ifdef PNG_MNG_FEATURES_SUPPORTED
1260png_uint_32 PNGAPI
1261png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1262{
1263 png_debug(1, "in png_permit_mng_features");
1264
1265 if (png_ptr == NULL)
1266 return 0;
1267
1268 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1269
1270 return png_ptr->mng_features_permitted;
1271}
1272#endif
1273
1274#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1275static unsigned int
1276add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1277{
1278 unsigned int i;
1279
1280 /* Utility function: update the 'keep' state of a chunk if it is already in
1281 * the list, otherwise add it to the list.
1282 */
1283 for (i=0; i<count; ++i, list += 5)
1284 {
1285 if (memcmp(list, add, 4) == 0)
1286 {
1287 list[4] = (png_byte)keep;
1288
1289 return count;
1290 }
1291 }
1292
1293 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1294 {
1295 ++count;
1296 memcpy(list, add, 4);
1297 list[4] = (png_byte)keep;
1298 }
1299
1300 return count;
1301}
1302
1303void PNGAPI
1304png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1305 png_const_bytep chunk_list, int num_chunks_in)
1306{
1307 png_bytep new_list;
1308 unsigned int num_chunks, old_num_chunks;
1309
1310 if (png_ptr == NULL)
1311 return;
1312
1313 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1314 {
1315 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1316
1317 return;
1318 }
1319
1320 if (num_chunks_in <= 0)
1321 {
1322 png_ptr->unknown_default = keep;
1323
1324 /* '0' means just set the flags, so stop here */
1325 if (num_chunks_in == 0)
1326 return;
1327 }
1328
1329 if (num_chunks_in < 0)
1330 {
1331 /* Ignore all unknown chunks and all chunks recognized by
1332 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1333 */
1334 static PNG_CONST png_byte chunks_to_ignore[] = {
1335 98, 75, 71, 68, '\0', /* bKGD */
1336 99, 72, 82, 77, '\0', /* cHRM */
1337 103, 65, 77, 65, '\0', /* gAMA */
1338 104, 73, 83, 84, '\0', /* hIST */
1339 105, 67, 67, 80, '\0', /* iCCP */
1340 105, 84, 88, 116, '\0', /* iTXt */
1341 111, 70, 70, 115, '\0', /* oFFs */
1342 112, 67, 65, 76, '\0', /* pCAL */
1343 112, 72, 89, 115, '\0', /* pHYs */
1344 115, 66, 73, 84, '\0', /* sBIT */
1345 115, 67, 65, 76, '\0', /* sCAL */
1346 115, 80, 76, 84, '\0', /* sPLT */
1347 115, 84, 69, 82, '\0', /* sTER */
1348 115, 82, 71, 66, '\0', /* sRGB */
1349 116, 69, 88, 116, '\0', /* tEXt */
1350 116, 73, 77, 69, '\0', /* tIME */
1351 122, 84, 88, 116, '\0' /* zTXt */
1352 };
1353
1354 chunk_list = chunks_to_ignore;
1355 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1356 }
1357
1358 else /* num_chunks_in > 0 */
1359 {
1360 if (chunk_list == NULL)
1361 {
1362 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1363 * which can be switched off.
1364 */
1365 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1366
1367 return;
1368 }
1369
1370 num_chunks = num_chunks_in;
1371 }
1372
1373 old_num_chunks = png_ptr->num_chunk_list;
1374 if (png_ptr->chunk_list == NULL)
1375 old_num_chunks = 0;
1376
1377 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1378 */
1379 if (num_chunks + old_num_chunks > UINT_MAX/5)
1380 {
1381 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1382
1383 return;
1384 }
1385
1386 /* If these chunks are being reset to the default then no more memory is
1387 * required because add_one_chunk above doesn't extend the list if the 'keep'
1388 * parameter is the default.
1389 */
1390 if (keep != 0)
1391 {
1392 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1393 5 * (num_chunks + old_num_chunks)));
1394
1395 if (old_num_chunks > 0)
1396 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1397 }
1398
1399 else if (old_num_chunks > 0)
1400 new_list = png_ptr->chunk_list;
1401
1402 else
1403 new_list = NULL;
1404
1405 /* Add the new chunks together with each one's handling code. If the chunk
1406 * already exists the code is updated, otherwise the chunk is added to the
1407 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1408 * the earlier convention that the last setting is the one that is used.)
1409 */
1410 if (new_list != NULL)
1411 {
1412 png_const_bytep inlist;
1413 png_bytep outlist;
1414 unsigned int i;
1415
1416 for (i=0; i<num_chunks; ++i)
1417 {
1418 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1419 chunk_list+5*i, keep);
1420 }
1421
1422 /* Now remove any spurious 'default' entries. */
1423 num_chunks = 0;
1424 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1425 {
1426 if (inlist[4])
1427 {
1428 if (outlist != inlist)
1429 memcpy(outlist, inlist, 5);
1430 outlist += 5;
1431 ++num_chunks;
1432 }
1433 }
1434
1435 /* This means the application has removed all the specialized handling. */
1436 if (num_chunks == 0)
1437 {
1438 if (png_ptr->chunk_list != new_list)
1439 png_free(png_ptr, new_list);
1440
1441 new_list = NULL;
1442 }
1443 }
1444
1445 else
1446 num_chunks = 0;
1447
1448 png_ptr->num_chunk_list = num_chunks;
1449
1450 if (png_ptr->chunk_list != new_list)
1451 {
1452 if (png_ptr->chunk_list != NULL)
1453 png_free(png_ptr, png_ptr->chunk_list);
1454
1455 png_ptr->chunk_list = new_list;
1456 }
1457}
1458#endif
1459
1460#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1461void PNGAPI
1462png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1463 png_user_chunk_ptr read_user_chunk_fn)
1464{
1465 png_debug(1, "in png_set_read_user_chunk_fn");
1466
1467 if (png_ptr == NULL)
1468 return;
1469
1470 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1471 png_ptr->user_chunk_ptr = user_chunk_ptr;
1472}
1473#endif
1474
1475#ifdef PNG_INFO_IMAGE_SUPPORTED
1476void PNGAPI
1477png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1478 png_bytepp row_pointers)
1479{
1480 png_debug1(1, "in %s storage function", "rows");
1481
1482 if (png_ptr == NULL || info_ptr == NULL)
1483 return;
1484
1485 if (info_ptr->row_pointers != NULL &&
1486 (info_ptr->row_pointers != row_pointers))
1487 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1488
1489 info_ptr->row_pointers = row_pointers;
1490
1491 if (row_pointers != NULL)
1492 info_ptr->valid |= PNG_INFO_IDAT;
1493}
1494#endif
1495
1496void PNGAPI
1497png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
1498{
1499 if (png_ptr == NULL)
1500 return;
1501
1502 if (size == 0 || size > PNG_UINT_31_MAX)
1503 png_error(png_ptr, "invalid compression buffer size");
1504
1505# ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1506 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1507 {
1508 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1509 return;
1510 }
1511# endif
1512
1513# ifdef PNG_WRITE_SUPPORTED
1514 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1515 {
1516 if (png_ptr->zowner != 0)
1517 {
1518 png_warning(png_ptr,
1519 "Compression buffer size cannot be changed because it is in use");
1520
1521 return;
1522 }
1523
1524#ifndef __COVERITY__
1525 if (size > ZLIB_IO_MAX)
1526 {
1527 png_warning(png_ptr,
1528 "Compression buffer size limited to system maximum");
1529 size = ZLIB_IO_MAX; /* must fit */
1530 }
1531#endif
1532
1533 if (size < 6)
1534 {
1535 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1536 * if this is permitted.
1537 */
1538 png_warning(png_ptr,
1539 "Compression buffer size cannot be reduced below 6");
1540
1541 return;
1542 }
1543
1544 if (png_ptr->zbuffer_size != size)
1545 {
1546 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1547 png_ptr->zbuffer_size = (uInt)size;
1548 }
1549 }
1550# endif
1551}
1552
1553void PNGAPI
1554png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1555{
1556 if (png_ptr != NULL && info_ptr != NULL)
1557 info_ptr->valid &= ~mask;
1558}
1559
1560
1561#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1562/* This function was added to libpng 1.2.6 */
1563void PNGAPI
1564png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1565 png_uint_32 user_height_max)
1566{
1567 /* Images with dimensions larger than these limits will be
1568 * rejected by png_set_IHDR(). To accept any PNG datastream
1569 * regardless of dimensions, set both limits to 0x7ffffffL.
1570 */
1571 if (png_ptr == NULL)
1572 return;
1573
1574 png_ptr->user_width_max = user_width_max;
1575 png_ptr->user_height_max = user_height_max;
1576}
1577
1578/* This function was added to libpng 1.4.0 */
1579void PNGAPI
1580png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1581{
1582 if (png_ptr != NULL)
1583 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1584}
1585
1586/* This function was added to libpng 1.4.1 */
1587void PNGAPI
1588png_set_chunk_malloc_max (png_structrp png_ptr,
1589 png_alloc_size_t user_chunk_malloc_max)
1590{
1591 if (png_ptr != NULL)
1592 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1593}
1594#endif /* ?SET_USER_LIMITS */
1595
1596
1597#ifdef PNG_BENIGN_ERRORS_SUPPORTED
1598void PNGAPI
1599png_set_benign_errors(png_structrp png_ptr, int allowed)
1600{
1601 png_debug(1, "in png_set_benign_errors");
1602
1603 /* If allowed is 1, png_benign_error() is treated as a warning.
1604 *
1605 * If allowed is 0, png_benign_error() is treated as an error (which
1606 * is the default behavior if png_set_benign_errors() is not called).
1607 */
1608
1609 if (allowed != 0)
1610 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1611 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1612
1613 else
1614 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1615 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1616}
1617#endif /* BENIGN_ERRORS */
1618
1619#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1620 /* Whether to report invalid palette index; added at libng-1.5.10.
1621 * It is possible for an indexed (color-type==3) PNG file to contain
1622 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1623 * fewer entries than the image's bit-depth would allow. We recover
1624 * from this gracefully by filling any incomplete palette with zeros
1625 * (opaque black). By default, when this occurs libpng will issue
1626 * a benign error. This API can be used to override that behavior.
1627 */
1628void PNGAPI
1629png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1630{
1631 png_debug(1, "in png_set_check_for_invalid_index");
1632
1633 if (allowed > 0)
1634 png_ptr->num_palette_max = 0;
1635
1636 else
1637 png_ptr->num_palette_max = -1;
1638}
1639#endif
1640#endif /* READ || WRITE */