1
2 /* pngset.c - storage of image information into info struct
3 *
4 * Copyright (c) 2018-2023 Cosmin Truta
5 * Copyright (c) 1998-2018 Glenn Randers-Pehrson
6 * Copyright (c) 1996-1997 Andreas Dilger
7 * 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
24 void PNGAPI
25 png_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
39 void PNGFAPI
40 png_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
68 void PNGFAPI
69 png_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
101 void PNGAPI
102 png_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
117 void PNGAPI
118 png_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_eXIf_SUPPORTED
138 void PNGAPI
139 png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
140 png_bytep exif)
141 {
142 png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
143 PNG_UNUSED(info_ptr)
144 PNG_UNUSED(exif)
145 }
146
147 void PNGAPI
148 png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
149 png_uint_32 num_exif, png_bytep exif)
150 {
151 png_bytep new_exif;
152
153 png_debug1(1, "in %s storage function", "eXIf");
154
155 if (png_ptr == NULL || info_ptr == NULL ||
156 (png_ptr->mode & PNG_WROTE_eXIf) != 0)
157 return;
158
159 new_exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr, num_exif));
160
161 if (new_exif == NULL)
162 {
163 png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
164 return;
165 }
166
167 memcpy(new_exif, exif, (size_t)num_exif);
168
169 png_free_data(png_ptr, info_ptr, PNG_FREE_EXIF, 0);
170
171 info_ptr->num_exif = num_exif;
172 info_ptr->exif = new_exif;
173 info_ptr->free_me |= PNG_FREE_EXIF;
174 info_ptr->valid |= PNG_INFO_eXIf;
175 }
176 #endif /* eXIf */
177
178 #ifdef PNG_gAMA_SUPPORTED
179 void PNGFAPI
180 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
181 png_fixed_point file_gamma)
182 {
183 png_debug1(1, "in %s storage function", "gAMA");
184
185 if (png_ptr == NULL || info_ptr == NULL)
186 return;
187
188 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
189 png_colorspace_sync_info(png_ptr, info_ptr);
190 }
191
192 # ifdef PNG_FLOATING_POINT_SUPPORTED
193 void PNGAPI
194 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
195 {
196 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
197 "png_set_gAMA"));
198 }
199 # endif
200 #endif
201
202 #ifdef PNG_hIST_SUPPORTED
203 void PNGAPI
204 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
205 png_const_uint_16p hist)
206 {
207 int i;
208
209 png_debug1(1, "in %s storage function", "hIST");
210
211 if (png_ptr == NULL || info_ptr == NULL)
212 return;
213
214 if (info_ptr->num_palette == 0 || info_ptr->num_palette
215 > PNG_MAX_PALETTE_LENGTH)
216 {
217 png_warning(png_ptr,
218 "Invalid palette size, hIST allocation skipped");
219
220 return;
221 }
222
223 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
224
225 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
226 * version 1.2.1
227 */
228 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
229 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
230
231 if (info_ptr->hist == NULL)
232 {
233 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
234 return;
235 }
236
237 for (i = 0; i < info_ptr->num_palette; i++)
238 info_ptr->hist[i] = hist[i];
239
240 info_ptr->free_me |= PNG_FREE_HIST;
241 info_ptr->valid |= PNG_INFO_hIST;
242 }
243 #endif
244
245 void PNGAPI
246 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
247 png_uint_32 width, png_uint_32 height, int bit_depth,
248 int color_type, int interlace_type, int compression_type,
249 int filter_type)
250 {
251 png_debug1(1, "in %s storage function", "IHDR");
252
253 if (png_ptr == NULL || info_ptr == NULL)
254 return;
255
256 info_ptr->width = width;
257 info_ptr->height = height;
258 info_ptr->bit_depth = (png_byte)bit_depth;
259 info_ptr->color_type = (png_byte)color_type;
260 info_ptr->compression_type = (png_byte)compression_type;
261 info_ptr->filter_type = (png_byte)filter_type;
262 info_ptr->interlace_type = (png_byte)interlace_type;
263
264 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
265 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
266 info_ptr->compression_type, info_ptr->filter_type);
267
268 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
269 info_ptr->channels = 1;
270
271 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
272 info_ptr->channels = 3;
273
274 else
275 info_ptr->channels = 1;
276
277 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
278 info_ptr->channels++;
279
280 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
281
282 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
283 }
284
285 #ifdef PNG_oFFs_SUPPORTED
286 void PNGAPI
287 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
288 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
289 {
290 png_debug1(1, "in %s storage function", "oFFs");
291
292 if (png_ptr == NULL || info_ptr == NULL)
293 return;
294
295 info_ptr->x_offset = offset_x;
296 info_ptr->y_offset = offset_y;
297 info_ptr->offset_unit_type = (png_byte)unit_type;
298 info_ptr->valid |= PNG_INFO_oFFs;
299 }
300 #endif
301
302 #ifdef PNG_pCAL_SUPPORTED
303 void PNGAPI
304 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
305 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
306 int nparams, png_const_charp units, png_charpp params)
307 {
308 size_t length;
309 int i;
310
311 png_debug1(1, "in %s storage function", "pCAL");
312
313 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
314 || (nparams > 0 && params == NULL))
315 return;
316
317 length = strlen(purpose) + 1;
318 png_debug1(3, "allocating purpose for info (%lu bytes)",
319 (unsigned long)length);
320
321 /* TODO: validate format of calibration name and unit name */
322
323 /* Check that the type matches the specification. */
324 if (type < 0 || type > 3)
325 {
326 png_chunk_report(png_ptr, "Invalid pCAL equation type",
327 PNG_CHUNK_WRITE_ERROR);
328 return;
329 }
330
331 if (nparams < 0 || nparams > 255)
332 {
333 png_chunk_report(png_ptr, "Invalid pCAL parameter count",
334 PNG_CHUNK_WRITE_ERROR);
335 return;
336 }
337
338 /* Validate params[nparams] */
339 for (i=0; i<nparams; ++i)
340 {
341 if (params[i] == NULL ||
342 !png_check_fp_string(params[i], strlen(params[i])))
343 {
344 png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
345 PNG_CHUNK_WRITE_ERROR);
346 return;
347 }
348 }
349
350 info_ptr->pcal_purpose = png_voidcast(png_charp,
351 png_malloc_warn(png_ptr, length));
352
353 if (info_ptr->pcal_purpose == NULL)
354 {
355 png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
356 PNG_CHUNK_WRITE_ERROR);
357 return;
358 }
359
360 memcpy(info_ptr->pcal_purpose, purpose, length);
361
362 info_ptr->free_me |= PNG_FREE_PCAL;
363
364 png_debug(3, "storing X0, X1, type, and nparams in info");
365 info_ptr->pcal_X0 = X0;
366 info_ptr->pcal_X1 = X1;
367 info_ptr->pcal_type = (png_byte)type;
368 info_ptr->pcal_nparams = (png_byte)nparams;
369
370 length = strlen(units) + 1;
371 png_debug1(3, "allocating units for info (%lu bytes)",
372 (unsigned long)length);
373
374 info_ptr->pcal_units = png_voidcast(png_charp,
375 png_malloc_warn(png_ptr, length));
376
377 if (info_ptr->pcal_units == NULL)
378 {
379 png_warning(png_ptr, "Insufficient memory for pCAL units");
380 return;
381 }
382
383 memcpy(info_ptr->pcal_units, units, length);
384
385 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
386 (size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
387
388 if (info_ptr->pcal_params == NULL)
389 {
390 png_warning(png_ptr, "Insufficient memory for pCAL params");
391 return;
392 }
393
394 memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
395 (sizeof (png_charp)));
396
397 for (i = 0; i < nparams; i++)
398 {
399 length = strlen(params[i]) + 1;
400 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
401 (unsigned long)length);
402
403 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
404
405 if (info_ptr->pcal_params[i] == NULL)
406 {
407 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
408 return;
409 }
410
411 memcpy(info_ptr->pcal_params[i], params[i], length);
412 }
413
414 info_ptr->valid |= PNG_INFO_pCAL;
415 }
416 #endif
417
418 #ifdef PNG_sCAL_SUPPORTED
419 void PNGAPI
420 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
421 int unit, png_const_charp swidth, png_const_charp sheight)
422 {
423 size_t lengthw = 0, lengthh = 0;
424
425 png_debug1(1, "in %s storage function", "sCAL");
426
427 if (png_ptr == NULL || info_ptr == NULL)
428 return;
429
430 /* Double check the unit (should never get here with an invalid
431 * unit unless this is an API call.)
432 */
433 if (unit != 1 && unit != 2)
434 png_error(png_ptr, "Invalid sCAL unit");
435
436 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
437 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
438 png_error(png_ptr, "Invalid sCAL width");
439
440 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
441 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
442 png_error(png_ptr, "Invalid sCAL height");
443
444 info_ptr->scal_unit = (png_byte)unit;
445
446 ++lengthw;
447
448 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
449
450 info_ptr->scal_s_width = png_voidcast(png_charp,
451 png_malloc_warn(png_ptr, lengthw));
452
453 if (info_ptr->scal_s_width == NULL)
454 {
455 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
456
457 return;
458 }
459
460 memcpy(info_ptr->scal_s_width, swidth, lengthw);
461
462 ++lengthh;
463
464 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
465
466 info_ptr->scal_s_height = png_voidcast(png_charp,
467 png_malloc_warn(png_ptr, lengthh));
468
469 if (info_ptr->scal_s_height == NULL)
470 {
471 png_free(png_ptr, info_ptr->scal_s_width);
472 info_ptr->scal_s_width = NULL;
473
474 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
475 return;
476 }
477
478 memcpy(info_ptr->scal_s_height, sheight, lengthh);
479
480 info_ptr->free_me |= PNG_FREE_SCAL;
481 info_ptr->valid |= PNG_INFO_sCAL;
482 }
483
484 # ifdef PNG_FLOATING_POINT_SUPPORTED
485 void PNGAPI
486 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
487 double width, double height)
488 {
489 png_debug1(1, "in %s storage function", "sCAL");
490
491 /* Check the arguments. */
492 if (width <= 0)
493 png_warning(png_ptr, "Invalid sCAL width ignored");
494
495 else if (height <= 0)
496 png_warning(png_ptr, "Invalid sCAL height ignored");
497
498 else
499 {
500 /* Convert 'width' and 'height' to ASCII. */
501 char swidth[PNG_sCAL_MAX_DIGITS+1];
502 char sheight[PNG_sCAL_MAX_DIGITS+1];
503
504 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
505 PNG_sCAL_PRECISION);
506 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
507 PNG_sCAL_PRECISION);
508
509 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
510 }
511 }
512 # endif
513
514 # ifdef PNG_FIXED_POINT_SUPPORTED
515 void PNGAPI
516 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
517 png_fixed_point width, png_fixed_point height)
518 {
519 png_debug1(1, "in %s storage function", "sCAL");
520
521 /* Check the arguments. */
522 if (width <= 0)
523 png_warning(png_ptr, "Invalid sCAL width ignored");
524
525 else if (height <= 0)
526 png_warning(png_ptr, "Invalid sCAL height ignored");
527
528 else
529 {
530 /* Convert 'width' and 'height' to ASCII. */
531 char swidth[PNG_sCAL_MAX_DIGITS+1];
532 char sheight[PNG_sCAL_MAX_DIGITS+1];
533
534 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
535 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
536
537 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
538 }
539 }
540 # endif
541 #endif
542
543 #ifdef PNG_pHYs_SUPPORTED
544 void PNGAPI
545 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
546 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
547 {
548 png_debug1(1, "in %s storage function", "pHYs");
549
550 if (png_ptr == NULL || info_ptr == NULL)
551 return;
552
553 info_ptr->x_pixels_per_unit = res_x;
554 info_ptr->y_pixels_per_unit = res_y;
555 info_ptr->phys_unit_type = (png_byte)unit_type;
556 info_ptr->valid |= PNG_INFO_pHYs;
557 }
558 #endif
559
560 void PNGAPI
561 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
562 png_const_colorp palette, int num_palette)
563 {
564
565 png_uint_32 max_palette_length;
566
567 png_debug1(1, "in %s storage function", "PLTE");
568
569 if (png_ptr == NULL || info_ptr == NULL)
570 return;
571
572 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
573 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
574
575 if (num_palette < 0 || num_palette > (int) max_palette_length)
576 {
577 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
578 png_error(png_ptr, "Invalid palette length");
579
580 else
581 {
582 png_warning(png_ptr, "Invalid palette length");
583
584 return;
585 }
586 }
587
588 if ((num_palette > 0 && palette == NULL) ||
589 (num_palette == 0
590 # ifdef PNG_MNG_FEATURES_SUPPORTED
591 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
592 # endif
593 ))
594 {
595 png_error(png_ptr, "Invalid palette");
596 }
597
598 /* It may not actually be necessary to set png_ptr->palette here;
599 * we do it for backward compatibility with the way the png_handle_tRNS
600 * function used to do the allocation.
601 *
602 * 1.6.0: the above statement appears to be incorrect; something has to set
603 * the palette inside png_struct on read.
604 */
605 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
606
607 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
608 * of num_palette entries, in case of an invalid PNG file or incorrect
609 * call to png_set_PLTE() with too-large sample values.
610 */
611 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
612 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
613
614 if (num_palette > 0)
615 memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
616 (sizeof (png_color)));
617
618 info_ptr->palette = png_ptr->palette;
619 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
620 info_ptr->free_me |= PNG_FREE_PLTE;
621 info_ptr->valid |= PNG_INFO_PLTE;
622 }
623
624 #ifdef PNG_sBIT_SUPPORTED
625 void PNGAPI
626 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
627 png_const_color_8p sig_bit)
628 {
629 png_debug1(1, "in %s storage function", "sBIT");
630
631 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
632 return;
633
634 info_ptr->sig_bit = *sig_bit;
635 info_ptr->valid |= PNG_INFO_sBIT;
636 }
637 #endif
638
639 #ifdef PNG_sRGB_SUPPORTED
640 void PNGAPI
641 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
642 {
643 png_debug1(1, "in %s storage function", "sRGB");
644
645 if (png_ptr == NULL || info_ptr == NULL)
646 return;
647
648 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
649 png_colorspace_sync_info(png_ptr, info_ptr);
650 }
651
652 void PNGAPI
653 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
654 int srgb_intent)
655 {
656 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
657
658 if (png_ptr == NULL || info_ptr == NULL)
659 return;
660
661 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
662 srgb_intent) != 0)
663 {
664 /* This causes the gAMA and cHRM to be written too */
665 info_ptr->colorspace.flags |=
666 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
667 }
668
669 png_colorspace_sync_info(png_ptr, info_ptr);
670 }
671 #endif /* sRGB */
672
673
674 #ifdef PNG_iCCP_SUPPORTED
675 void PNGAPI
676 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
677 png_const_charp name, int compression_type,
678 png_const_bytep profile, png_uint_32 proflen)
679 {
680 png_charp new_iccp_name;
681 png_bytep new_iccp_profile;
682 size_t length;
683
684 png_debug1(1, "in %s storage function", "iCCP");
685
686 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
687 return;
688
689 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
690 png_app_error(png_ptr, "Invalid iCCP compression method");
691
692 /* Set the colorspace first because this validates the profile; do not
693 * override previously set app cHRM or gAMA here (because likely as not the
694 * application knows better than libpng what the correct values are.) Pass
695 * the info_ptr color_type field to png_colorspace_set_ICC because in the
696 * write case it has not yet been stored in png_ptr.
697 */
698 {
699 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
700 proflen, profile, info_ptr->color_type);
701
702 png_colorspace_sync_info(png_ptr, info_ptr);
703
704 /* Don't do any of the copying if the profile was bad, or inconsistent. */
705 if (result == 0)
706 return;
707
708 /* But do write the gAMA and cHRM chunks from the profile. */
709 info_ptr->colorspace.flags |=
710 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
711 }
712
713 length = strlen(name)+1;
714 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
715
716 if (new_iccp_name == NULL)
717 {
718 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
719
720 return;
721 }
722
723 memcpy(new_iccp_name, name, length);
724 new_iccp_profile = png_voidcast(png_bytep,
725 png_malloc_warn(png_ptr, proflen));
726
727 if (new_iccp_profile == NULL)
728 {
729 png_free(png_ptr, new_iccp_name);
730 png_benign_error(png_ptr,
731 "Insufficient memory to process iCCP profile");
732
733 return;
734 }
735
736 memcpy(new_iccp_profile, profile, proflen);
737
738 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
739
740 info_ptr->iccp_proflen = proflen;
741 info_ptr->iccp_name = new_iccp_name;
742 info_ptr->iccp_profile = new_iccp_profile;
743 info_ptr->free_me |= PNG_FREE_ICCP;
744 info_ptr->valid |= PNG_INFO_iCCP;
745 }
746 #endif
747
748 #ifdef PNG_TEXT_SUPPORTED
749 void PNGAPI
750 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
751 png_const_textp text_ptr, int num_text)
752 {
753 int ret;
754 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
755
756 if (ret != 0)
757 png_error(png_ptr, "Insufficient memory to store text");
758 }
759
760 int /* PRIVATE */
761 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
762 png_const_textp text_ptr, int num_text)
763 {
764 int i;
765
766 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
767 (unsigned long)png_ptr->chunk_name);
768
769 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
770 return(0);
771
772 /* Make sure we have enough space in the "text" array in info_struct
773 * to hold all of the incoming text_ptr objects. This compare can't overflow
774 * because max_text >= num_text (anyway, subtract of two positive integers
775 * can't overflow in any case.)
776 */
777 if (num_text > info_ptr->max_text - info_ptr->num_text)
778 {
779 int old_num_text = info_ptr->num_text;
780 int max_text;
781 png_textp new_text = NULL;
782
783 /* Calculate an appropriate max_text, checking for overflow. */
784 max_text = old_num_text;
785 if (num_text <= INT_MAX - max_text)
786 {
787 max_text += num_text;
788
789 /* Round up to a multiple of 8 */
790 if (max_text < INT_MAX-8)
791 max_text = (max_text + 8) & ~0x7;
792
793 else
794 max_text = INT_MAX;
795
796 /* Now allocate a new array and copy the old members in; this does all
797 * the overflow checks.
798 */
799 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
800 info_ptr->text, old_num_text, max_text-old_num_text,
801 sizeof *new_text));
802 }
803
804 if (new_text == NULL)
805 {
806 png_chunk_report(png_ptr, "too many text chunks",
807 PNG_CHUNK_WRITE_ERROR);
808
809 return 1;
810 }
811
812 png_free(png_ptr, info_ptr->text);
813
814 info_ptr->text = new_text;
815 info_ptr->free_me |= PNG_FREE_TEXT;
816 info_ptr->max_text = max_text;
817 /* num_text is adjusted below as the entries are copied in */
818
819 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
820 }
821
822 for (i = 0; i < num_text; i++)
823 {
824 size_t text_length, key_len;
825 size_t lang_len, lang_key_len;
826 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
827
828 if (text_ptr[i].key == NULL)
829 continue;
830
831 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
832 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
833 {
834 png_chunk_report(png_ptr, "text compression mode is out of range",
835 PNG_CHUNK_WRITE_ERROR);
836 continue;
837 }
838
839 key_len = strlen(text_ptr[i].key);
840
841 if (text_ptr[i].compression <= 0)
842 {
843 lang_len = 0;
844 lang_key_len = 0;
845 }
846
847 else
848 # ifdef PNG_iTXt_SUPPORTED
849 {
850 /* Set iTXt data */
851
852 if (text_ptr[i].lang != NULL)
853 lang_len = strlen(text_ptr[i].lang);
854
855 else
856 lang_len = 0;
857
858 if (text_ptr[i].lang_key != NULL)
859 lang_key_len = strlen(text_ptr[i].lang_key);
860
861 else
862 lang_key_len = 0;
863 }
864 # else /* iTXt */
865 {
866 png_chunk_report(png_ptr, "iTXt chunk not supported",
867 PNG_CHUNK_WRITE_ERROR);
868 continue;
869 }
870 # endif
871
872 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
873 {
874 text_length = 0;
875 # ifdef PNG_iTXt_SUPPORTED
876 if (text_ptr[i].compression > 0)
877 textp->compression = PNG_ITXT_COMPRESSION_NONE;
878
879 else
880 # endif
881 textp->compression = PNG_TEXT_COMPRESSION_NONE;
882 }
883
884 else
885 {
886 text_length = strlen(text_ptr[i].text);
887 textp->compression = text_ptr[i].compression;
888 }
889
890 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
891 key_len + text_length + lang_len + lang_key_len + 4));
892
893 if (textp->key == NULL)
894 {
895 png_chunk_report(png_ptr, "text chunk: out of memory",
896 PNG_CHUNK_WRITE_ERROR);
897
898 return 1;
899 }
900
901 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
902 (unsigned long)(png_uint_32)
903 (key_len + lang_len + lang_key_len + text_length + 4),
904 textp->key);
905
906 memcpy(textp->key, text_ptr[i].key, key_len);
907 *(textp->key + key_len) = '\0';
908
909 if (text_ptr[i].compression > 0)
910 {
911 textp->lang = textp->key + key_len + 1;
912 memcpy(textp->lang, text_ptr[i].lang, lang_len);
913 *(textp->lang + lang_len) = '\0';
914 textp->lang_key = textp->lang + lang_len + 1;
915 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
916 *(textp->lang_key + lang_key_len) = '\0';
917 textp->text = textp->lang_key + lang_key_len + 1;
918 }
919
920 else
921 {
922 textp->lang=NULL;
923 textp->lang_key=NULL;
924 textp->text = textp->key + key_len + 1;
925 }
926
927 if (text_length != 0)
928 memcpy(textp->text, text_ptr[i].text, text_length);
929
930 *(textp->text + text_length) = '\0';
931
932 # ifdef PNG_iTXt_SUPPORTED
933 if (textp->compression > 0)
934 {
935 textp->text_length = 0;
936 textp->itxt_length = text_length;
937 }
938
939 else
940 # endif
941 {
942 textp->text_length = text_length;
943 textp->itxt_length = 0;
944 }
945
946 info_ptr->num_text++;
947 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
948 }
949
950 return(0);
951 }
952 #endif
953
954 #ifdef PNG_tIME_SUPPORTED
955 void PNGAPI
956 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
957 png_const_timep mod_time)
958 {
959 png_debug1(1, "in %s storage function", "tIME");
960
961 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
962 (png_ptr->mode & PNG_WROTE_tIME) != 0)
963 return;
964
965 if (mod_time->month == 0 || mod_time->month > 12 ||
966 mod_time->day == 0 || mod_time->day > 31 ||
967 mod_time->hour > 23 || mod_time->minute > 59 ||
968 mod_time->second > 60)
969 {
970 png_warning(png_ptr, "Ignoring invalid time value");
971
972 return;
973 }
974
975 info_ptr->mod_time = *mod_time;
976 info_ptr->valid |= PNG_INFO_tIME;
977 }
978 #endif
979
980 #ifdef PNG_tRNS_SUPPORTED
981 void PNGAPI
982 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
983 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
984 {
985 png_debug1(1, "in %s storage function", "tRNS");
986
987 if (png_ptr == NULL || info_ptr == NULL)
988
989 return;
990
991 if (trans_alpha != NULL)
992 {
993 /* It may not actually be necessary to set png_ptr->trans_alpha here;
994 * we do it for backward compatibility with the way the png_handle_tRNS
995 * function used to do the allocation.
996 *
997 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
998 * relies on png_set_tRNS storing the information in png_struct
999 * (otherwise it won't be there for the code in pngrtran.c).
1000 */
1001
1002 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
1003
1004 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
1005 {
1006 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
1007 info_ptr->trans_alpha = png_voidcast(png_bytep,
1008 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
1009 memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
1010
1011 info_ptr->free_me |= PNG_FREE_TRNS;
1012 info_ptr->valid |= PNG_INFO_tRNS;
1013 }
1014 png_ptr->trans_alpha = info_ptr->trans_alpha;
1015 }
1016
1017 if (trans_color != NULL)
1018 {
1019 #ifdef PNG_WARNINGS_SUPPORTED
1020 if (info_ptr->bit_depth < 16)
1021 {
1022 int sample_max = (1 << info_ptr->bit_depth) - 1;
1023
1024 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
1025 trans_color->gray > sample_max) ||
1026 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
1027 (trans_color->red > sample_max ||
1028 trans_color->green > sample_max ||
1029 trans_color->blue > sample_max)))
1030 png_warning(png_ptr,
1031 "tRNS chunk has out-of-range samples for bit_depth");
1032 }
1033 #endif
1034
1035 info_ptr->trans_color = *trans_color;
1036
1037 if (num_trans == 0)
1038 num_trans = 1;
1039 }
1040
1041 info_ptr->num_trans = (png_uint_16)num_trans;
1042
1043 if (num_trans != 0)
1044 {
1045 info_ptr->free_me |= PNG_FREE_TRNS;
1046 info_ptr->valid |= PNG_INFO_tRNS;
1047 }
1048 }
1049 #endif
1050
1051 #ifdef PNG_sPLT_SUPPORTED
1052 void PNGAPI
1053 png_set_sPLT(png_const_structrp png_ptr,
1054 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1055 /*
1056 * entries - array of png_sPLT_t structures
1057 * to be added to the list of palettes
1058 * in the info structure.
1059 *
1060 * nentries - number of palette structures to be
1061 * added.
1062 */
1063 {
1064 png_sPLT_tp np;
1065
1066 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1067 return;
1068
1069 /* Use the internal realloc function, which checks for all the possible
1070 * overflows. Notice that the parameters are (int) and (size_t)
1071 */
1072 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1073 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1074 sizeof *np));
1075
1076 if (np == NULL)
1077 {
1078 /* Out of memory or too many chunks */
1079 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1080 return;
1081 }
1082
1083 png_free(png_ptr, info_ptr->splt_palettes);
1084
1085 info_ptr->splt_palettes = np;
1086 info_ptr->free_me |= PNG_FREE_SPLT;
1087
1088 np += info_ptr->splt_palettes_num;
1089
1090 do
1091 {
1092 size_t length;
1093
1094 /* Skip invalid input entries */
1095 if (entries->name == NULL || entries->entries == NULL)
1096 {
1097 /* png_handle_sPLT doesn't do this, so this is an app error */
1098 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1099 /* Just skip the invalid entry */
1100 continue;
1101 }
1102
1103 np->depth = entries->depth;
1104
1105 /* In the event of out-of-memory just return - there's no point keeping
1106 * on trying to add sPLT chunks.
1107 */
1108 length = strlen(entries->name) + 1;
1109 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1110
1111 if (np->name == NULL)
1112 break;
1113
1114 memcpy(np->name, entries->name, length);
1115
1116 /* IMPORTANT: we have memory now that won't get freed if something else
1117 * goes wrong; this code must free it. png_malloc_array produces no
1118 * warnings; use a png_chunk_report (below) if there is an error.
1119 */
1120 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1121 entries->nentries, sizeof (png_sPLT_entry)));
1122
1123 if (np->entries == NULL)
1124 {
1125 png_free(png_ptr, np->name);
1126 np->name = NULL;
1127 break;
1128 }
1129
1130 np->nentries = entries->nentries;
1131 /* This multiply can't overflow because png_malloc_array has already
1132 * checked it when doing the allocation.
1133 */
1134 memcpy(np->entries, entries->entries,
1135 (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
1136
1137 /* Note that 'continue' skips the advance of the out pointer and out
1138 * count, so an invalid entry is not added.
1139 */
1140 info_ptr->valid |= PNG_INFO_sPLT;
1141 ++(info_ptr->splt_palettes_num);
1142 ++np;
1143 ++entries;
1144 }
1145 while (--nentries);
1146
1147 if (nentries > 0)
1148 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1149 }
1150 #endif /* sPLT */
1151
1152 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1153 static png_byte
1154 check_location(png_const_structrp png_ptr, int location)
1155 {
1156 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1157
1158 /* New in 1.6.0; copy the location and check it. This is an API
1159 * change; previously the app had to use the
1160 * png_set_unknown_chunk_location API below for each chunk.
1161 */
1162 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1163 {
1164 /* Write struct, so unknown chunks come from the app */
1165 png_app_warning(png_ptr,
1166 "png_set_unknown_chunks now expects a valid location");
1167 /* Use the old behavior */
1168 location = (png_byte)(png_ptr->mode &
1169 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1170 }
1171
1172 /* This need not be an internal error - if the app calls
1173 * png_set_unknown_chunks on a read pointer it must get the location right.
1174 */
1175 if (location == 0)
1176 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1177
1178 /* Now reduce the location to the top-most set bit by removing each least
1179 * significant bit in turn.
1180 */
1181 while (location != (location & -location))
1182 location &= ~(location & -location);
1183
1184 /* The cast is safe because 'location' is a bit mask and only the low four
1185 * bits are significant.
1186 */
1187 return (png_byte)location;
1188 }
1189
1190 void PNGAPI
1191 png_set_unknown_chunks(png_const_structrp png_ptr,
1192 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1193 {
1194 png_unknown_chunkp np;
1195
1196 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1197 unknowns == NULL)
1198 return;
1199
1200 /* Check for the failure cases where support has been disabled at compile
1201 * time. This code is hardly ever compiled - it's here because
1202 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1203 * code) but may be meaningless if the read or write handling of unknown
1204 * chunks is not compiled in.
1205 */
1206 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1207 defined(PNG_READ_SUPPORTED)
1208 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1209 {
1210 png_app_error(png_ptr, "no unknown chunk support on read");
1211
1212 return;
1213 }
1214 # endif
1215 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1216 defined(PNG_WRITE_SUPPORTED)
1217 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1218 {
1219 png_app_error(png_ptr, "no unknown chunk support on write");
1220
1221 return;
1222 }
1223 # endif
1224
1225 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1226 * unknown critical chunks could be lost with just a warning resulting in
1227 * undefined behavior. Now png_chunk_report is used to provide behavior
1228 * appropriate to read or write.
1229 */
1230 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1231 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1232 sizeof *np));
1233
1234 if (np == NULL)
1235 {
1236 png_chunk_report(png_ptr, "too many unknown chunks",
1237 PNG_CHUNK_WRITE_ERROR);
1238 return;
1239 }
1240
1241 png_free(png_ptr, info_ptr->unknown_chunks);
1242
1243 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1244 info_ptr->free_me |= PNG_FREE_UNKN;
1245
1246 np += info_ptr->unknown_chunks_num;
1247
1248 /* Increment unknown_chunks_num each time round the loop to protect the
1249 * just-allocated chunk data.
1250 */
1251 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1252 {
1253 memcpy(np->name, unknowns->name, (sizeof np->name));
1254 np->name[(sizeof np->name)-1] = '\0';
1255 np->location = check_location(png_ptr, unknowns->location);
1256
1257 if (unknowns->size == 0)
1258 {
1259 np->data = NULL;
1260 np->size = 0;
1261 }
1262
1263 else
1264 {
1265 np->data = png_voidcast(png_bytep,
1266 png_malloc_base(png_ptr, unknowns->size));
1267
1268 if (np->data == NULL)
1269 {
1270 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1271 PNG_CHUNK_WRITE_ERROR);
1272 /* But just skip storing the unknown chunk */
1273 continue;
1274 }
1275
1276 memcpy(np->data, unknowns->data, unknowns->size);
1277 np->size = unknowns->size;
1278 }
1279
1280 /* These increments are skipped on out-of-memory for the data - the
1281 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1282 * This is correct in the read case (the chunk is just dropped.)
1283 */
1284 ++np;
1285 ++(info_ptr->unknown_chunks_num);
1286 }
1287 }
1288
1289 void PNGAPI
1290 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1291 int chunk, int location)
1292 {
1293 /* This API is pretty pointless in 1.6.0 because the location can be set
1294 * before the call to png_set_unknown_chunks.
1295 *
1296 * TODO: add a png_app_warning in 1.7
1297 */
1298 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1299 chunk < info_ptr->unknown_chunks_num)
1300 {
1301 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1302 {
1303 png_app_error(png_ptr, "invalid unknown chunk location");
1304 /* Fake out the pre 1.6.0 behavior: */
1305 if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1306 location = PNG_AFTER_IDAT;
1307
1308 else
1309 location = PNG_HAVE_IHDR; /* also undocumented */
1310 }
1311
1312 info_ptr->unknown_chunks[chunk].location =
1313 check_location(png_ptr, location);
1314 }
1315 }
1316 #endif /* STORE_UNKNOWN_CHUNKS */
1317
1318 #ifdef PNG_MNG_FEATURES_SUPPORTED
1319 png_uint_32 PNGAPI
1320 png_permit_mng_features(png_structrp png_ptr, png_uint_32 mng_features)
1321 {
1322 png_debug(1, "in png_permit_mng_features");
1323
1324 if (png_ptr == NULL)
1325 return 0;
1326
1327 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1328
1329 return png_ptr->mng_features_permitted;
1330 }
1331 #endif
1332
1333 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1334 static unsigned int
1335 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1336 {
1337 unsigned int i;
1338
1339 /* Utility function: update the 'keep' state of a chunk if it is already in
1340 * the list, otherwise add it to the list.
1341 */
1342 for (i=0; i<count; ++i, list += 5)
1343 {
1344 if (memcmp(list, add, 4) == 0)
1345 {
1346 list[4] = (png_byte)keep;
1347
1348 return count;
1349 }
1350 }
1351
1352 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1353 {
1354 ++count;
1355 memcpy(list, add, 4);
1356 list[4] = (png_byte)keep;
1357 }
1358
1359 return count;
1360 }
1361
1362 void PNGAPI
1363 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1364 png_const_bytep chunk_list, int num_chunks_in)
1365 {
1366 png_bytep new_list;
1367 unsigned int num_chunks, old_num_chunks;
1368
1369 if (png_ptr == NULL)
1370 return;
1371
1372 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1373 {
1374 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1375
1376 return;
1377 }
1378
1379 if (num_chunks_in <= 0)
1380 {
1381 png_ptr->unknown_default = keep;
1382
1383 /* '0' means just set the flags, so stop here */
1384 if (num_chunks_in == 0)
1385 return;
1386 }
1387
1388 if (num_chunks_in < 0)
1389 {
1390 /* Ignore all unknown chunks and all chunks recognized by
1391 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1392 */
1393 static const png_byte chunks_to_ignore[] = {
1394 98, 75, 71, 68, '\0', /* bKGD */
1395 99, 72, 82, 77, '\0', /* cHRM */
1396 101, 88, 73, 102, '\0', /* eXIf */
1397 103, 65, 77, 65, '\0', /* gAMA */
1398 104, 73, 83, 84, '\0', /* hIST */
1399 105, 67, 67, 80, '\0', /* iCCP */
1400 105, 84, 88, 116, '\0', /* iTXt */
1401 111, 70, 70, 115, '\0', /* oFFs */
1402 112, 67, 65, 76, '\0', /* pCAL */
1403 112, 72, 89, 115, '\0', /* pHYs */
1404 115, 66, 73, 84, '\0', /* sBIT */
1405 115, 67, 65, 76, '\0', /* sCAL */
1406 115, 80, 76, 84, '\0', /* sPLT */
1407 115, 84, 69, 82, '\0', /* sTER */
1408 115, 82, 71, 66, '\0', /* sRGB */
1409 116, 69, 88, 116, '\0', /* tEXt */
1410 116, 73, 77, 69, '\0', /* tIME */
1411 122, 84, 88, 116, '\0' /* zTXt */
1412 };
1413
1414 chunk_list = chunks_to_ignore;
1415 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1416 }
1417
1418 else /* num_chunks_in > 0 */
1419 {
1420 if (chunk_list == NULL)
1421 {
1422 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1423 * which can be switched off.
1424 */
1425 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1426
1427 return;
1428 }
1429
1430 num_chunks = (unsigned int)num_chunks_in;
1431 }
1432
1433 old_num_chunks = png_ptr->num_chunk_list;
1434 if (png_ptr->chunk_list == NULL)
1435 old_num_chunks = 0;
1436
1437 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1438 */
1439 if (num_chunks + old_num_chunks > UINT_MAX/5)
1440 {
1441 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1442
1443 return;
1444 }
1445
1446 /* If these chunks are being reset to the default then no more memory is
1447 * required because add_one_chunk above doesn't extend the list if the 'keep'
1448 * parameter is the default.
1449 */
1450 if (keep != 0)
1451 {
1452 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1453 5 * (num_chunks + old_num_chunks)));
1454
1455 if (old_num_chunks > 0)
1456 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1457 }
1458
1459 else if (old_num_chunks > 0)
1460 new_list = png_ptr->chunk_list;
1461
1462 else
1463 new_list = NULL;
1464
1465 /* Add the new chunks together with each one's handling code. If the chunk
1466 * already exists the code is updated, otherwise the chunk is added to the
1467 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1468 * the earlier convention that the last setting is the one that is used.)
1469 */
1470 if (new_list != NULL)
1471 {
1472 png_const_bytep inlist;
1473 png_bytep outlist;
1474 unsigned int i;
1475
1476 for (i=0; i<num_chunks; ++i)
1477 {
1478 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1479 chunk_list+5*i, keep);
1480 }
1481
1482 /* Now remove any spurious 'default' entries. */
1483 num_chunks = 0;
1484 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1485 {
1486 if (inlist[4])
1487 {
1488 if (outlist != inlist)
1489 memcpy(outlist, inlist, 5);
1490 outlist += 5;
1491 ++num_chunks;
1492 }
1493 }
1494
1495 /* This means the application has removed all the specialized handling. */
1496 if (num_chunks == 0)
1497 {
1498 if (png_ptr->chunk_list != new_list)
1499 png_free(png_ptr, new_list);
1500
1501 new_list = NULL;
1502 }
1503 }
1504
1505 else
1506 num_chunks = 0;
1507
1508 png_ptr->num_chunk_list = num_chunks;
1509
1510 if (png_ptr->chunk_list != new_list)
1511 {
1512 if (png_ptr->chunk_list != NULL)
1513 png_free(png_ptr, png_ptr->chunk_list);
1514
1515 png_ptr->chunk_list = new_list;
1516 }
1517 }
1518 #endif
1519
1520 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1521 void PNGAPI
1522 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1523 png_user_chunk_ptr read_user_chunk_fn)
1524 {
1525 png_debug(1, "in png_set_read_user_chunk_fn");
1526
1527 if (png_ptr == NULL)
1528 return;
1529
1530 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1531 png_ptr->user_chunk_ptr = user_chunk_ptr;
1532 }
1533 #endif
1534
1535 #ifdef PNG_INFO_IMAGE_SUPPORTED
1536 void PNGAPI
1537 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1538 png_bytepp row_pointers)
1539 {
1540 png_debug1(1, "in %s storage function", "rows");
1541
1542 if (png_ptr == NULL || info_ptr == NULL)
1543 return;
1544
1545 if (info_ptr->row_pointers != NULL &&
1546 (info_ptr->row_pointers != row_pointers))
1547 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1548
1549 info_ptr->row_pointers = row_pointers;
1550
1551 if (row_pointers != NULL)
1552 info_ptr->valid |= PNG_INFO_IDAT;
1553 }
1554 #endif
1555
1556 void PNGAPI
1557 png_set_compression_buffer_size(png_structrp png_ptr, size_t size)
1558 {
1559 if (png_ptr == NULL)
1560 return;
1561
1562 if (size == 0 || size > PNG_UINT_31_MAX)
1563 png_error(png_ptr, "invalid compression buffer size");
1564
1565 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1566 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1567 {
1568 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1569 return;
1570 }
1571 # endif
1572
1573 # ifdef PNG_WRITE_SUPPORTED
1574 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1575 {
1576 if (png_ptr->zowner != 0)
1577 {
1578 png_warning(png_ptr,
1579 "Compression buffer size cannot be changed because it is in use");
1580
1581 return;
1582 }
1583
1584 #ifndef __COVERITY__
1585 /* Some compilers complain that this is always false. However, it
1586 * can be true when integer overflow happens.
1587 */
1588 if (size > ZLIB_IO_MAX)
1589 {
1590 png_warning(png_ptr,
1591 "Compression buffer size limited to system maximum");
1592 size = ZLIB_IO_MAX; /* must fit */
1593 }
1594 #endif
1595
1596 if (size < 6)
1597 {
1598 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1599 * if this is permitted.
1600 */
1601 png_warning(png_ptr,
1602 "Compression buffer size cannot be reduced below 6");
1603
1604 return;
1605 }
1606
1607 if (png_ptr->zbuffer_size != size)
1608 {
1609 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1610 png_ptr->zbuffer_size = (uInt)size;
1611 }
1612 }
1613 # endif
1614 }
1615
1616 void PNGAPI
1617 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1618 {
1619 if (png_ptr != NULL && info_ptr != NULL)
1620 info_ptr->valid &= (unsigned int)(~mask);
1621 }
1622
1623
1624 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1625 /* This function was added to libpng 1.2.6 */
1626 void PNGAPI
1627 png_set_user_limits(png_structrp png_ptr, png_uint_32 user_width_max,
1628 png_uint_32 user_height_max)
1629 {
1630 /* Images with dimensions larger than these limits will be
1631 * rejected by png_set_IHDR(). To accept any PNG datastream
1632 * regardless of dimensions, set both limits to 0x7fffffff.
1633 */
1634 if (png_ptr == NULL)
1635 return;
1636
1637 png_ptr->user_width_max = user_width_max;
1638 png_ptr->user_height_max = user_height_max;
1639 }
1640
1641 /* This function was added to libpng 1.4.0 */
1642 void PNGAPI
1643 png_set_chunk_cache_max(png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1644 {
1645 if (png_ptr != NULL)
1646 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1647 }
1648
1649 /* This function was added to libpng 1.4.1 */
1650 void PNGAPI
1651 png_set_chunk_malloc_max(png_structrp png_ptr,
1652 png_alloc_size_t user_chunk_malloc_max)
1653 {
1654 if (png_ptr != NULL)
1655 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1656 }
1657 #endif /* ?SET_USER_LIMITS */
1658
1659
1660 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1661 void PNGAPI
1662 png_set_benign_errors(png_structrp png_ptr, int allowed)
1663 {
1664 png_debug(1, "in png_set_benign_errors");
1665
1666 /* If allowed is 1, png_benign_error() is treated as a warning.
1667 *
1668 * If allowed is 0, png_benign_error() is treated as an error (which
1669 * is the default behavior if png_set_benign_errors() is not called).
1670 */
1671
1672 if (allowed != 0)
1673 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1674 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1675
1676 else
1677 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1678 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1679 }
1680 #endif /* BENIGN_ERRORS */
1681
1682 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1683 /* Whether to report invalid palette index; added at libng-1.5.10.
1684 * It is possible for an indexed (color-type==3) PNG file to contain
1685 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1686 * fewer entries than the image's bit-depth would allow. We recover
1687 * from this gracefully by filling any incomplete palette with zeros
1688 * (opaque black). By default, when this occurs libpng will issue
1689 * a benign error. This API can be used to override that behavior.
1690 */
1691 void PNGAPI
1692 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1693 {
1694 png_debug(1, "in png_set_check_for_invalid_index");
1695
1696 if (allowed > 0)
1697 png_ptr->num_palette_max = 0;
1698
1699 else
1700 png_ptr->num_palette_max = -1;
1701 }
1702 #endif
1703
1704 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1705 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1706 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1707 * and if invalid, correct the keyword rather than discarding the entire
1708 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1709 * length, forbids leading or trailing whitespace, multiple internal spaces,
1710 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1711 *
1712 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1713 * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1714 * valid one could not be generated, and the caller must png_error.
1715 */
1716 png_uint_32 /* PRIVATE */
1717 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1718 {
1719 #ifdef PNG_WARNINGS_SUPPORTED
1720 png_const_charp orig_key = key;
1721 #endif
1722 png_uint_32 key_len = 0;
1723 int bad_character = 0;
1724 int space = 1;
1725
1726 png_debug(1, "in png_check_keyword");
1727
1728 if (key == NULL)
1729 {
1730 *new_key = 0;
1731 return 0;
1732 }
1733
1734 while (*key && key_len < 79)
1735 {
1736 png_byte ch = (png_byte)*key++;
1737
1738 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1739 {
1740 *new_key++ = ch; ++key_len; space = 0;
1741 }
1742
1743 else if (space == 0)
1744 {
1745 /* A space or an invalid character when one wasn't seen immediately
1746 * before; output just a space.
1747 */
1748 *new_key++ = 32; ++key_len; space = 1;
1749
1750 /* If the character was not a space then it is invalid. */
1751 if (ch != 32)
1752 bad_character = ch;
1753 }
1754
1755 else if (bad_character == 0)
1756 bad_character = ch; /* just skip it, record the first error */
1757 }
1758
1759 if (key_len > 0 && space != 0) /* trailing space */
1760 {
1761 --key_len; --new_key;
1762 if (bad_character == 0)
1763 bad_character = 32;
1764 }
1765
1766 /* Terminate the keyword */
1767 *new_key = 0;
1768
1769 if (key_len == 0)
1770 return 0;
1771
1772 #ifdef PNG_WARNINGS_SUPPORTED
1773 /* Try to only output one warning per keyword: */
1774 if (*key != 0) /* keyword too long */
1775 png_warning(png_ptr, "keyword truncated");
1776
1777 else if (bad_character != 0)
1778 {
1779 PNG_WARNING_PARAMETERS(p)
1780
1781 png_warning_parameter(p, 1, orig_key);
1782 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1783
1784 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1785 }
1786 #else /* !WARNINGS */
1787 PNG_UNUSED(png_ptr)
1788 #endif /* !WARNINGS */
1789
1790 return key_len;
1791 }
1792 #endif /* TEXT || pCAL || iCCP || sPLT */
1793 #endif /* READ || WRITE */