1
2/* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.6.21 [January 15, 2016]
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 Green X"),
127 png_fixed(png_ptr, green_Y, "cHRM Green Y"),
128 png_fixed(png_ptr, green_Z, "cHRM Green Z"),
129 png_fixed(png_ptr, blue_X, "cHRM Blue X"),
130 png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
131 png_fixed(png_ptr, blue_Z, "cHRM Blue 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_uint_32 max_palette_length;
517
518 png_debug1(1, "in %s storage function", "PLTE");
519
520 if (png_ptr == NULL || info_ptr == NULL)
521 return;
522
523 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
524 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
525
526 if (num_palette < 0 || num_palette > (int) max_palette_length)
527 {
528 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
529 png_error(png_ptr, "Invalid palette length");
530
531 else
532 {
533 png_warning(png_ptr, "Invalid palette length");
534
535 return;
536 }
537 }
538
539 if ((num_palette > 0 && palette == NULL) ||
540 (num_palette == 0
541# ifdef PNG_MNG_FEATURES_SUPPORTED
542 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
543# endif
544 ))
545 {
546 png_error(png_ptr, "Invalid palette");
547 }
548
549 /* It may not actually be necessary to set png_ptr->palette here;
550 * we do it for backward compatibility with the way the png_handle_tRNS
551 * function used to do the allocation.
552 *
553 * 1.6.0: the above statement appears to be incorrect; something has to set
554 * the palette inside png_struct on read.
555 */
556 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
557
558 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
559 * of num_palette entries, in case of an invalid PNG file or incorrect
560 * call to png_set_PLTE() with too-large sample values.
561 */
562 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
563 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
564
565 if (num_palette > 0)
566 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
567 info_ptr->palette = png_ptr->palette;
568 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
569
570 info_ptr->free_me |= PNG_FREE_PLTE;
571
572 info_ptr->valid |= PNG_INFO_PLTE;
573}
574
575#ifdef PNG_sBIT_SUPPORTED
576void PNGAPI
577png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
578 png_const_color_8p sig_bit)
579{
580 png_debug1(1, "in %s storage function", "sBIT");
581
582 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
583 return;
584
585 info_ptr->sig_bit = *sig_bit;
586 info_ptr->valid |= PNG_INFO_sBIT;
587}
588#endif
589
590#ifdef PNG_sRGB_SUPPORTED
591void PNGAPI
592png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
593{
594 png_debug1(1, "in %s storage function", "sRGB");
595
596 if (png_ptr == NULL || info_ptr == NULL)
597 return;
598
599 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
600 png_colorspace_sync_info(png_ptr, info_ptr);
601}
602
603void PNGAPI
604png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
605 int srgb_intent)
606{
607 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
608
609 if (png_ptr == NULL || info_ptr == NULL)
610 return;
611
612 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
613 srgb_intent) != 0)
614 {
615 /* This causes the gAMA and cHRM to be written too */
616 info_ptr->colorspace.flags |=
617 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
618 }
619
620 png_colorspace_sync_info(png_ptr, info_ptr);
621}
622#endif /* sRGB */
623
624
625#ifdef PNG_iCCP_SUPPORTED
626void PNGAPI
627png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
628 png_const_charp name, int compression_type,
629 png_const_bytep profile, png_uint_32 proflen)
630{
631 png_charp new_iccp_name;
632 png_bytep new_iccp_profile;
633 png_size_t length;
634
635 png_debug1(1, "in %s storage function", "iCCP");
636
637 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
638 return;
639
640 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
641 png_app_error(png_ptr, "Invalid iCCP compression method");
642
643 /* Set the colorspace first because this validates the profile; do not
644 * override previously set app cHRM or gAMA here (because likely as not the
645 * application knows better than libpng what the correct values are.) Pass
646 * the info_ptr color_type field to png_colorspace_set_ICC because in the
647 * write case it has not yet been stored in png_ptr.
648 */
649 {
650 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
651 proflen, profile, info_ptr->color_type);
652
653 png_colorspace_sync_info(png_ptr, info_ptr);
654
655 /* Don't do any of the copying if the profile was bad, or inconsistent. */
656 if (result == 0)
657 return;
658
659 /* But do write the gAMA and cHRM chunks from the profile. */
660 info_ptr->colorspace.flags |=
661 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
662 }
663
664 length = strlen(name)+1;
665 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
666
667 if (new_iccp_name == NULL)
668 {
669 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
670
671 return;
672 }
673
674 memcpy(new_iccp_name, name, length);
675 new_iccp_profile = png_voidcast(png_bytep,
676 png_malloc_warn(png_ptr, proflen));
677
678 if (new_iccp_profile == NULL)
679 {
680 png_free(png_ptr, new_iccp_name);
681 png_benign_error(png_ptr,
682 "Insufficient memory to process iCCP profile");
683
684 return;
685 }
686
687 memcpy(new_iccp_profile, profile, proflen);
688
689 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
690
691 info_ptr->iccp_proflen = proflen;
692 info_ptr->iccp_name = new_iccp_name;
693 info_ptr->iccp_profile = new_iccp_profile;
694 info_ptr->free_me |= PNG_FREE_ICCP;
695 info_ptr->valid |= PNG_INFO_iCCP;
696}
697#endif
698
699#ifdef PNG_TEXT_SUPPORTED
700void PNGAPI
701png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
702 png_const_textp text_ptr, int num_text)
703{
704 int ret;
705 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
706
707 if (ret != 0)
708 png_error(png_ptr, "Insufficient memory to store text");
709}
710
711int /* PRIVATE */
712png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
713 png_const_textp text_ptr, int num_text)
714{
715 int i;
716
717 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
718 (unsigned long)png_ptr->chunk_name);
719
720 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
721 return(0);
722
723 /* Make sure we have enough space in the "text" array in info_struct
724 * to hold all of the incoming text_ptr objects. This compare can't overflow
725 * because max_text >= num_text (anyway, subtract of two positive integers
726 * can't overflow in any case.)
727 */
728 if (num_text > info_ptr->max_text - info_ptr->num_text)
729 {
730 int old_num_text = info_ptr->num_text;
731 int max_text;
732 png_textp new_text = NULL;
733
734 /* Calculate an appropriate max_text, checking for overflow. */
735 max_text = old_num_text;
736 if (num_text <= INT_MAX - max_text)
737 {
738 max_text += num_text;
739
740 /* Round up to a multiple of 8 */
741 if (max_text < INT_MAX-8)
742 max_text = (max_text + 8) & ~0x7;
743
744 else
745 max_text = INT_MAX;
746
747 /* Now allocate a new array and copy the old members in; this does all
748 * the overflow checks.
749 */
750 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
751 info_ptr->text, old_num_text, max_text-old_num_text,
752 sizeof *new_text));
753 }
754
755 if (new_text == NULL)
756 {
757 png_chunk_report(png_ptr, "too many text chunks",
758 PNG_CHUNK_WRITE_ERROR);
759
760 return 1;
761 }
762
763 png_free(png_ptr, info_ptr->text);
764
765 info_ptr->text = new_text;
766 info_ptr->free_me |= PNG_FREE_TEXT;
767 info_ptr->max_text = max_text;
768 /* num_text is adjusted below as the entries are copied in */
769
770 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
771 }
772
773 for (i = 0; i < num_text; i++)
774 {
775 size_t text_length, key_len;
776 size_t lang_len, lang_key_len;
777 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
778
779 if (text_ptr[i].key == NULL)
780 continue;
781
782 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
783 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
784 {
785 png_chunk_report(png_ptr, "text compression mode is out of range",
786 PNG_CHUNK_WRITE_ERROR);
787 continue;
788 }
789
790 key_len = strlen(text_ptr[i].key);
791
792 if (text_ptr[i].compression <= 0)
793 {
794 lang_len = 0;
795 lang_key_len = 0;
796 }
797
798 else
799# ifdef PNG_iTXt_SUPPORTED
800 {
801 /* Set iTXt data */
802
803 if (text_ptr[i].lang != NULL)
804 lang_len = strlen(text_ptr[i].lang);
805
806 else
807 lang_len = 0;
808
809 if (text_ptr[i].lang_key != NULL)
810 lang_key_len = strlen(text_ptr[i].lang_key);
811
812 else
813 lang_key_len = 0;
814 }
815# else /* iTXt */
816 {
817 png_chunk_report(png_ptr, "iTXt chunk not supported",
818 PNG_CHUNK_WRITE_ERROR);
819 continue;
820 }
821# endif
822
823 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
824 {
825 text_length = 0;
826# ifdef PNG_iTXt_SUPPORTED
827 if (text_ptr[i].compression > 0)
828 textp->compression = PNG_ITXT_COMPRESSION_NONE;
829
830 else
831# endif
832 textp->compression = PNG_TEXT_COMPRESSION_NONE;
833 }
834
835 else
836 {
837 text_length = strlen(text_ptr[i].text);
838 textp->compression = text_ptr[i].compression;
839 }
840
841 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
842 key_len + text_length + lang_len + lang_key_len + 4));
843
844 if (textp->key == NULL)
845 {
846 png_chunk_report(png_ptr, "text chunk: out of memory",
847 PNG_CHUNK_WRITE_ERROR);
848
849 return 1;
850 }
851
852 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
853 (unsigned long)(png_uint_32)
854 (key_len + lang_len + lang_key_len + text_length + 4),
855 textp->key);
856
857 memcpy(textp->key, text_ptr[i].key, key_len);
858 *(textp->key + key_len) = '\0';
859
860 if (text_ptr[i].compression > 0)
861 {
862 textp->lang = textp->key + key_len + 1;
863 memcpy(textp->lang, text_ptr[i].lang, lang_len);
864 *(textp->lang + lang_len) = '\0';
865 textp->lang_key = textp->lang + lang_len + 1;
866 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
867 *(textp->lang_key + lang_key_len) = '\0';
868 textp->text = textp->lang_key + lang_key_len + 1;
869 }
870
871 else
872 {
873 textp->lang=NULL;
874 textp->lang_key=NULL;
875 textp->text = textp->key + key_len + 1;
876 }
877
878 if (text_length != 0)
879 memcpy(textp->text, text_ptr[i].text, text_length);
880
881 *(textp->text + text_length) = '\0';
882
883# ifdef PNG_iTXt_SUPPORTED
884 if (textp->compression > 0)
885 {
886 textp->text_length = 0;
887 textp->itxt_length = text_length;
888 }
889
890 else
891# endif
892 {
893 textp->text_length = text_length;
894 textp->itxt_length = 0;
895 }
896
897 info_ptr->num_text++;
898 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
899 }
900
901 return(0);
902}
903#endif
904
905#ifdef PNG_tIME_SUPPORTED
906void PNGAPI
907png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
908 png_const_timep mod_time)
909{
910 png_debug1(1, "in %s storage function", "tIME");
911
912 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
913 (png_ptr->mode & PNG_WROTE_tIME) != 0)
914 return;
915
916 if (mod_time->month == 0 || mod_time->month > 12 ||
917 mod_time->day == 0 || mod_time->day > 31 ||
918 mod_time->hour > 23 || mod_time->minute > 59 ||
919 mod_time->second > 60)
920 {
921 png_warning(png_ptr, "Ignoring invalid time value");
922
923 return;
924 }
925
926 info_ptr->mod_time = *mod_time;
927 info_ptr->valid |= PNG_INFO_tIME;
928}
929#endif
930
931#ifdef PNG_tRNS_SUPPORTED
932void PNGAPI
933png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
934 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
935{
936 png_debug1(1, "in %s storage function", "tRNS");
937
938 if (png_ptr == NULL || info_ptr == NULL)
939
940 return;
941
942 if (trans_alpha != NULL)
943 {
944 /* It may not actually be necessary to set png_ptr->trans_alpha here;
945 * we do it for backward compatibility with the way the png_handle_tRNS
946 * function used to do the allocation.
947 *
948 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
949 * relies on png_set_tRNS storing the information in png_struct
950 * (otherwise it won't be there for the code in pngrtran.c).
951 */
952
953 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
954
955 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
956 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
957 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
958
959 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
960 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
961 }
962
963 if (trans_color != NULL)
964 {
965#ifdef PNG_WARNINGS_SUPPORTED
966 if (info_ptr->bit_depth < 16)
967 {
968 int sample_max = (1 << info_ptr->bit_depth) - 1;
969
970 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
971 trans_color->gray > sample_max) ||
972 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
973 (trans_color->red > sample_max ||
974 trans_color->green > sample_max ||
975 trans_color->blue > sample_max)))
976 png_warning(png_ptr,
977 "tRNS chunk has out-of-range samples for bit_depth");
978 }
979#endif
980
981 info_ptr->trans_color = *trans_color;
982
983 if (num_trans == 0)
984 num_trans = 1;
985 }
986
987 info_ptr->num_trans = (png_uint_16)num_trans;
988
989 if (num_trans != 0)
990 {
991 info_ptr->valid |= PNG_INFO_tRNS;
992 info_ptr->free_me |= PNG_FREE_TRNS;
993 }
994}
995#endif
996
997#ifdef PNG_sPLT_SUPPORTED
998void PNGAPI
999png_set_sPLT(png_const_structrp png_ptr,
1000 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1001/*
1002 * entries - array of png_sPLT_t structures
1003 * to be added to the list of palettes
1004 * in the info structure.
1005 *
1006 * nentries - number of palette structures to be
1007 * added.
1008 */
1009{
1010 png_sPLT_tp np;
1011
1012 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1013 return;
1014
1015 /* Use the internal realloc function, which checks for all the possible
1016 * overflows. Notice that the parameters are (int) and (size_t)
1017 */
1018 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1019 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1020 sizeof *np));
1021
1022 if (np == NULL)
1023 {
1024 /* Out of memory or too many chunks */
1025 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1026
1027 return;
1028 }
1029
1030 png_free(png_ptr, info_ptr->splt_palettes);
1031 info_ptr->splt_palettes = np;
1032 info_ptr->free_me |= PNG_FREE_SPLT;
1033
1034 np += info_ptr->splt_palettes_num;
1035
1036 do
1037 {
1038 png_size_t length;
1039
1040 /* Skip invalid input entries */
1041 if (entries->name == NULL || entries->entries == NULL)
1042 {
1043 /* png_handle_sPLT doesn't do this, so this is an app error */
1044 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1045 /* Just skip the invalid entry */
1046 continue;
1047 }
1048
1049 np->depth = entries->depth;
1050
1051 /* In the event of out-of-memory just return - there's no point keeping
1052 * on trying to add sPLT chunks.
1053 */
1054 length = strlen(entries->name) + 1;
1055 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1056
1057 if (np->name == NULL)
1058 break;
1059
1060 memcpy(np->name, entries->name, length);
1061
1062 /* IMPORTANT: we have memory now that won't get freed if something else
1063 * goes wrong; this code must free it. png_malloc_array produces no
1064 * warnings; use a png_chunk_report (below) if there is an error.
1065 */
1066 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1067 entries->nentries, sizeof (png_sPLT_entry)));
1068
1069 if (np->entries == NULL)
1070 {
1071 png_free(png_ptr, np->name);
1072 np->name = NULL;
1073 break;
1074 }
1075
1076 np->nentries = entries->nentries;
1077 /* This multiply can't overflow because png_malloc_array has already
1078 * checked it when doing the allocation.
1079 */
1080 memcpy(np->entries, entries->entries,
1081 entries->nentries * sizeof (png_sPLT_entry));
1082
1083 /* Note that 'continue' skips the advance of the out pointer and out
1084 * count, so an invalid entry is not added.
1085 */
1086 info_ptr->valid |= PNG_INFO_sPLT;
1087 ++(info_ptr->splt_palettes_num);
1088 ++np;
1089 }
1090 while (++entries, --nentries);
1091
1092 if (nentries > 0)
1093 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1094}
1095#endif /* sPLT */
1096
1097#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1098static png_byte
1099check_location(png_const_structrp png_ptr, int location)
1100{
1101 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1102
1103 /* New in 1.6.0; copy the location and check it. This is an API
1104 * change; previously the app had to use the
1105 * png_set_unknown_chunk_location API below for each chunk.
1106 */
1107 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1108 {
1109 /* Write struct, so unknown chunks come from the app */
1110 png_app_warning(png_ptr,
1111 "png_set_unknown_chunks now expects a valid location");
1112 /* Use the old behavior */
1113 location = (png_byte)(png_ptr->mode &
1114 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1115 }
1116
1117 /* This need not be an internal error - if the app calls
1118 * png_set_unknown_chunks on a read pointer it must get the location right.
1119 */
1120 if (location == 0)
1121 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1122
1123 /* Now reduce the location to the top-most set bit by removing each least
1124 * significant bit in turn.
1125 */
1126 while (location != (location & -location))
1127 location &= ~(location & -location);
1128
1129 /* The cast is safe because 'location' is a bit mask and only the low four
1130 * bits are significant.
1131 */
1132 return (png_byte)location;
1133}
1134
1135void PNGAPI
1136png_set_unknown_chunks(png_const_structrp png_ptr,
1137 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1138{
1139 png_unknown_chunkp np;
1140
1141 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1142 unknowns == NULL)
1143 return;
1144
1145 /* Check for the failure cases where support has been disabled at compile
1146 * time. This code is hardly ever compiled - it's here because
1147 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1148 * code) but may be meaningless if the read or write handling of unknown
1149 * chunks is not compiled in.
1150 */
1151# if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1152 defined(PNG_READ_SUPPORTED)
1153 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1154 {
1155 png_app_error(png_ptr, "no unknown chunk support on read");
1156
1157 return;
1158 }
1159# endif
1160# if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1161 defined(PNG_WRITE_SUPPORTED)
1162 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1163 {
1164 png_app_error(png_ptr, "no unknown chunk support on write");
1165
1166 return;
1167 }
1168# endif
1169
1170 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1171 * unknown critical chunks could be lost with just a warning resulting in
1172 * undefined behavior. Now png_chunk_report is used to provide behavior
1173 * appropriate to read or write.
1174 */
1175 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1176 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1177 sizeof *np));
1178
1179 if (np == NULL)
1180 {
1181 png_chunk_report(png_ptr, "too many unknown chunks",
1182 PNG_CHUNK_WRITE_ERROR);
1183
1184 return;
1185 }
1186
1187 png_free(png_ptr, info_ptr->unknown_chunks);
1188 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1189 info_ptr->free_me |= PNG_FREE_UNKN;
1190
1191 np += info_ptr->unknown_chunks_num;
1192
1193 /* Increment unknown_chunks_num each time round the loop to protect the
1194 * just-allocated chunk data.
1195 */
1196 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1197 {
1198 memcpy(np->name, unknowns->name, (sizeof np->name));
1199 np->name[(sizeof np->name)-1] = '\0';
1200 np->location = check_location(png_ptr, unknowns->location);
1201
1202 if (unknowns->size == 0)
1203 {
1204 np->data = NULL;
1205 np->size = 0;
1206 }
1207
1208 else
1209 {
1210 np->data = png_voidcast(png_bytep,
1211 png_malloc_base(png_ptr, unknowns->size));
1212
1213 if (np->data == NULL)
1214 {
1215 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1216 PNG_CHUNK_WRITE_ERROR);
1217 /* But just skip storing the unknown chunk */
1218 continue;
1219 }
1220
1221 memcpy(np->data, unknowns->data, unknowns->size);
1222 np->size = unknowns->size;
1223 }
1224
1225 /* These increments are skipped on out-of-memory for the data - the
1226 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1227 * This is correct in the read case (the chunk is just dropped.)
1228 */
1229 ++np;
1230 ++(info_ptr->unknown_chunks_num);
1231 }
1232}
1233
1234void PNGAPI
1235png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1236 int chunk, int location)
1237{
1238 /* This API is pretty pointless in 1.6.0 because the location can be set
1239 * before the call to png_set_unknown_chunks.
1240 *
1241 * TODO: add a png_app_warning in 1.7
1242 */
1243 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1244 chunk < info_ptr->unknown_chunks_num)
1245 {
1246 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1247 {
1248 png_app_error(png_ptr, "invalid unknown chunk location");
1249 /* Fake out the pre 1.6.0 behavior: */
1250 if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1251 location = PNG_AFTER_IDAT;
1252
1253 else
1254 location = PNG_HAVE_IHDR; /* also undocumented */
1255 }
1256
1257 info_ptr->unknown_chunks[chunk].location =
1258 check_location(png_ptr, location);
1259 }
1260}
1261#endif /* STORE_UNKNOWN_CHUNKS */
1262
1263#ifdef PNG_MNG_FEATURES_SUPPORTED
1264png_uint_32 PNGAPI
1265png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1266{
1267 png_debug(1, "in png_permit_mng_features");
1268
1269 if (png_ptr == NULL)
1270 return 0;
1271
1272 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1273
1274 return png_ptr->mng_features_permitted;
1275}
1276#endif
1277
1278#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1279static unsigned int
1280add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1281{
1282 unsigned int i;
1283
1284 /* Utility function: update the 'keep' state of a chunk if it is already in
1285 * the list, otherwise add it to the list.
1286 */
1287 for (i=0; i<count; ++i, list += 5)
1288 {
1289 if (memcmp(list, add, 4) == 0)
1290 {
1291 list[4] = (png_byte)keep;
1292
1293 return count;
1294 }
1295 }
1296
1297 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1298 {
1299 ++count;
1300 memcpy(list, add, 4);
1301 list[4] = (png_byte)keep;
1302 }
1303
1304 return count;
1305}
1306
1307void PNGAPI
1308png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1309 png_const_bytep chunk_list, int num_chunks_in)
1310{
1311 png_bytep new_list;
1312 unsigned int num_chunks, old_num_chunks;
1313
1314 if (png_ptr == NULL)
1315 return;
1316
1317 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1318 {
1319 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1320
1321 return;
1322 }
1323
1324 if (num_chunks_in <= 0)
1325 {
1326 png_ptr->unknown_default = keep;
1327
1328 /* '0' means just set the flags, so stop here */
1329 if (num_chunks_in == 0)
1330 return;
1331 }
1332
1333 if (num_chunks_in < 0)
1334 {
1335 /* Ignore all unknown chunks and all chunks recognized by
1336 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1337 */
1338 static PNG_CONST png_byte chunks_to_ignore[] = {
1339 98, 75, 71, 68, '\0', /* bKGD */
1340 99, 72, 82, 77, '\0', /* cHRM */
1341 103, 65, 77, 65, '\0', /* gAMA */
1342 104, 73, 83, 84, '\0', /* hIST */
1343 105, 67, 67, 80, '\0', /* iCCP */
1344 105, 84, 88, 116, '\0', /* iTXt */
1345 111, 70, 70, 115, '\0', /* oFFs */
1346 112, 67, 65, 76, '\0', /* pCAL */
1347 112, 72, 89, 115, '\0', /* pHYs */
1348 115, 66, 73, 84, '\0', /* sBIT */
1349 115, 67, 65, 76, '\0', /* sCAL */
1350 115, 80, 76, 84, '\0', /* sPLT */
1351 115, 84, 69, 82, '\0', /* sTER */
1352 115, 82, 71, 66, '\0', /* sRGB */
1353 116, 69, 88, 116, '\0', /* tEXt */
1354 116, 73, 77, 69, '\0', /* tIME */
1355 122, 84, 88, 116, '\0' /* zTXt */
1356 };
1357
1358 chunk_list = chunks_to_ignore;
1359 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1360 }
1361
1362 else /* num_chunks_in > 0 */
1363 {
1364 if (chunk_list == NULL)
1365 {
1366 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1367 * which can be switched off.
1368 */
1369 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1370
1371 return;
1372 }
1373
1374 num_chunks = num_chunks_in;
1375 }
1376
1377 old_num_chunks = png_ptr->num_chunk_list;
1378 if (png_ptr->chunk_list == NULL)
1379 old_num_chunks = 0;
1380
1381 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1382 */
1383 if (num_chunks + old_num_chunks > UINT_MAX/5)
1384 {
1385 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1386
1387 return;
1388 }
1389
1390 /* If these chunks are being reset to the default then no more memory is
1391 * required because add_one_chunk above doesn't extend the list if the 'keep'
1392 * parameter is the default.
1393 */
1394 if (keep != 0)
1395 {
1396 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1397 5 * (num_chunks + old_num_chunks)));
1398
1399 if (old_num_chunks > 0)
1400 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1401 }
1402
1403 else if (old_num_chunks > 0)
1404 new_list = png_ptr->chunk_list;
1405
1406 else
1407 new_list = NULL;
1408
1409 /* Add the new chunks together with each one's handling code. If the chunk
1410 * already exists the code is updated, otherwise the chunk is added to the
1411 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1412 * the earlier convention that the last setting is the one that is used.)
1413 */
1414 if (new_list != NULL)
1415 {
1416 png_const_bytep inlist;
1417 png_bytep outlist;
1418 unsigned int i;
1419
1420 for (i=0; i<num_chunks; ++i)
1421 {
1422 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1423 chunk_list+5*i, keep);
1424 }
1425
1426 /* Now remove any spurious 'default' entries. */
1427 num_chunks = 0;
1428 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1429 {
1430 if (inlist[4])
1431 {
1432 if (outlist != inlist)
1433 memcpy(outlist, inlist, 5);
1434 outlist += 5;
1435 ++num_chunks;
1436 }
1437 }
1438
1439 /* This means the application has removed all the specialized handling. */
1440 if (num_chunks == 0)
1441 {
1442 if (png_ptr->chunk_list != new_list)
1443 png_free(png_ptr, new_list);
1444
1445 new_list = NULL;
1446 }
1447 }
1448
1449 else
1450 num_chunks = 0;
1451
1452 png_ptr->num_chunk_list = num_chunks;
1453
1454 if (png_ptr->chunk_list != new_list)
1455 {
1456 if (png_ptr->chunk_list != NULL)
1457 png_free(png_ptr, png_ptr->chunk_list);
1458
1459 png_ptr->chunk_list = new_list;
1460 }
1461}
1462#endif
1463
1464#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1465void PNGAPI
1466png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1467 png_user_chunk_ptr read_user_chunk_fn)
1468{
1469 png_debug(1, "in png_set_read_user_chunk_fn");
1470
1471 if (png_ptr == NULL)
1472 return;
1473
1474 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1475 png_ptr->user_chunk_ptr = user_chunk_ptr;
1476}
1477#endif
1478
1479#ifdef PNG_INFO_IMAGE_SUPPORTED
1480void PNGAPI
1481png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1482 png_bytepp row_pointers)
1483{
1484 png_debug1(1, "in %s storage function", "rows");
1485
1486 if (png_ptr == NULL || info_ptr == NULL)
1487 return;
1488
1489 if (info_ptr->row_pointers != NULL &&
1490 (info_ptr->row_pointers != row_pointers))
1491 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1492
1493 info_ptr->row_pointers = row_pointers;
1494
1495 if (row_pointers != NULL)
1496 info_ptr->valid |= PNG_INFO_IDAT;
1497}
1498#endif
1499
1500void PNGAPI
1501png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
1502{
1503 if (png_ptr == NULL)
1504 return;
1505
1506 if (size == 0 || size > PNG_UINT_31_MAX)
1507 png_error(png_ptr, "invalid compression buffer size");
1508
1509# ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1510 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1511 {
1512 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1513 return;
1514 }
1515# endif
1516
1517# ifdef PNG_WRITE_SUPPORTED
1518 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1519 {
1520 if (png_ptr->zowner != 0)
1521 {
1522 png_warning(png_ptr,
1523 "Compression buffer size cannot be changed because it is in use");
1524
1525 return;
1526 }
1527
1528#ifndef __COVERITY__
1529 /* Some compilers complain that this is always false. However, it
1530 * can be true when integer overflow happens.
1531 */
1532 if (size > ZLIB_IO_MAX)
1533 {
1534 png_warning(png_ptr,
1535 "Compression buffer size limited to system maximum");
1536 size = ZLIB_IO_MAX; /* must fit */
1537 }
1538#endif
1539
1540 if (size < 6)
1541 {
1542 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1543 * if this is permitted.
1544 */
1545 png_warning(png_ptr,
1546 "Compression buffer size cannot be reduced below 6");
1547
1548 return;
1549 }
1550
1551 if (png_ptr->zbuffer_size != size)
1552 {
1553 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1554 png_ptr->zbuffer_size = (uInt)size;
1555 }
1556 }
1557# endif
1558}
1559
1560void PNGAPI
1561png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1562{
1563 if (png_ptr != NULL && info_ptr != NULL)
1564 info_ptr->valid &= ~mask;
1565}
1566
1567
1568#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1569/* This function was added to libpng 1.2.6 */
1570void PNGAPI
1571png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1572 png_uint_32 user_height_max)
1573{
1574 /* Images with dimensions larger than these limits will be
1575 * rejected by png_set_IHDR(). To accept any PNG datastream
1576 * regardless of dimensions, set both limits to 0x7fffffff.
1577 */
1578 if (png_ptr == NULL)
1579 return;
1580
1581 png_ptr->user_width_max = user_width_max;
1582 png_ptr->user_height_max = user_height_max;
1583}
1584
1585/* This function was added to libpng 1.4.0 */
1586void PNGAPI
1587png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1588{
1589 if (png_ptr != NULL)
1590 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1591}
1592
1593/* This function was added to libpng 1.4.1 */
1594void PNGAPI
1595png_set_chunk_malloc_max (png_structrp png_ptr,
1596 png_alloc_size_t user_chunk_malloc_max)
1597{
1598 if (png_ptr != NULL)
1599 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1600}
1601#endif /* ?SET_USER_LIMITS */
1602
1603
1604#ifdef PNG_BENIGN_ERRORS_SUPPORTED
1605void PNGAPI
1606png_set_benign_errors(png_structrp png_ptr, int allowed)
1607{
1608 png_debug(1, "in png_set_benign_errors");
1609
1610 /* If allowed is 1, png_benign_error() is treated as a warning.
1611 *
1612 * If allowed is 0, png_benign_error() is treated as an error (which
1613 * is the default behavior if png_set_benign_errors() is not called).
1614 */
1615
1616 if (allowed != 0)
1617 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1618 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1619
1620 else
1621 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1622 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1623}
1624#endif /* BENIGN_ERRORS */
1625
1626#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1627 /* Whether to report invalid palette index; added at libng-1.5.10.
1628 * It is possible for an indexed (color-type==3) PNG file to contain
1629 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1630 * fewer entries than the image's bit-depth would allow. We recover
1631 * from this gracefully by filling any incomplete palette with zeros
1632 * (opaque black). By default, when this occurs libpng will issue
1633 * a benign error. This API can be used to override that behavior.
1634 */
1635void PNGAPI
1636png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1637{
1638 png_debug(1, "in png_set_check_for_invalid_index");
1639
1640 if (allowed > 0)
1641 png_ptr->num_palette_max = 0;
1642
1643 else
1644 png_ptr->num_palette_max = -1;
1645}
1646#endif
1647
1648#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1649 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1650/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1651 * and if invalid, correct the keyword rather than discarding the entire
1652 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1653 * length, forbids leading or trailing whitespace, multiple internal spaces,
1654 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1655 *
1656 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1657 * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1658 * valid one could not be generated, and the caller must png_error.
1659 */
1660png_uint_32 /* PRIVATE */
1661png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1662{
1663 png_const_charp orig_key = key;
1664 png_uint_32 key_len = 0;
1665 int bad_character = 0;
1666 int space = 1;
1667
1668 png_debug(1, "in png_check_keyword");
1669
1670 if (key == NULL)
1671 {
1672 *new_key = 0;
1673 return 0;
1674 }
1675
1676 while (*key && key_len < 79)
1677 {
1678 png_byte ch = (png_byte)*key++;
1679
1680 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1681 *new_key++ = ch, ++key_len, space = 0;
1682
1683 else if (space == 0)
1684 {
1685 /* A space or an invalid character when one wasn't seen immediately
1686 * before; output just a space.
1687 */
1688 *new_key++ = 32, ++key_len, space = 1;
1689
1690 /* If the character was not a space then it is invalid. */
1691 if (ch != 32)
1692 bad_character = ch;
1693 }
1694
1695 else if (bad_character == 0)
1696 bad_character = ch; /* just skip it, record the first error */
1697 }
1698
1699 if (key_len > 0 && space != 0) /* trailing space */
1700 {
1701 --key_len, --new_key;
1702 if (bad_character == 0)
1703 bad_character = 32;
1704 }
1705
1706 /* Terminate the keyword */
1707 *new_key = 0;
1708
1709 if (key_len == 0)
1710 return 0;
1711
1712#ifdef PNG_WARNINGS_SUPPORTED
1713 /* Try to only output one warning per keyword: */
1714 if (*key != 0) /* keyword too long */
1715 png_warning(png_ptr, "keyword truncated");
1716
1717 else if (bad_character != 0)
1718 {
1719 PNG_WARNING_PARAMETERS(p)
1720
1721 png_warning_parameter(p, 1, orig_key);
1722 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1723
1724 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1725 }
1726#endif /* WARNINGS */
1727
1728 return key_len;
1729}
1730#endif /* TEXT || pCAL || iCCP || sPLT */
1731#endif /* READ || WRITE */
1732