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1
2/* pngset.c - storage of image information into info struct
3 *
4 * Copyright (c) 2018 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
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_eXIf_SUPPORTED
138void PNGAPI
139png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
140 png_bytep eXIf_buf)
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_buf)
145}
146
147void PNGAPI
148png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
149 png_uint_32 num_exif, png_bytep eXIf_buf)
150{
151 int i;
152
153 png_debug1(1, "in %s storage function", "eXIf");
154
155 if (png_ptr == NULL || info_ptr == NULL)
156 return;
157
158 if (info_ptr->exif)
159 {
160 png_free(png_ptr, info_ptr->exif);
161 info_ptr->exif = NULL;
162 }
163
164 info_ptr->num_exif = num_exif;
165
166 info_ptr->exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr,
167 info_ptr->num_exif));
168
169 if (info_ptr->exif == NULL)
170 {
171 png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
172 return;
173 }
174
175 info_ptr->free_me |= PNG_FREE_EXIF;
176
177 for (i = 0; i < (int) info_ptr->num_exif; i++)
178 info_ptr->exif[i] = eXIf_buf[i];
179
180 info_ptr->valid |= PNG_INFO_eXIf;
181}
182#endif /* eXIf */
183
184#ifdef PNG_gAMA_SUPPORTED
185void PNGFAPI
186png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
187 png_fixed_point file_gamma)
188{
189 png_debug1(1, "in %s storage function", "gAMA");
190
191 if (png_ptr == NULL || info_ptr == NULL)
192 return;
193
194 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
195 png_colorspace_sync_info(png_ptr, info_ptr);
196}
197
198# ifdef PNG_FLOATING_POINT_SUPPORTED
199void PNGAPI
200png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
201{
202 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
203 "png_set_gAMA"));
204}
205# endif
206#endif
207
208#ifdef PNG_hIST_SUPPORTED
209void PNGAPI
210png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
211 png_const_uint_16p hist)
212{
213 int i;
214
215 png_debug1(1, "in %s storage function", "hIST");
216
217 if (png_ptr == NULL || info_ptr == NULL)
218 return;
219
220 if (info_ptr->num_palette == 0 || info_ptr->num_palette
221 > PNG_MAX_PALETTE_LENGTH)
222 {
223 png_warning(png_ptr,
224 "Invalid palette size, hIST allocation skipped");
225
226 return;
227 }
228
229 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
230
231 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
232 * version 1.2.1
233 */
234 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
235 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
236
237 if (info_ptr->hist == NULL)
238 {
239 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
240
241 return;
242 }
243
244 info_ptr->free_me |= PNG_FREE_HIST;
245
246 for (i = 0; i < info_ptr->num_palette; i++)
247 info_ptr->hist[i] = hist[i];
248
249 info_ptr->valid |= PNG_INFO_hIST;
250}
251#endif
252
253void PNGAPI
254png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
255 png_uint_32 width, png_uint_32 height, int bit_depth,
256 int color_type, int interlace_type, int compression_type,
257 int filter_type)
258{
259 png_debug1(1, "in %s storage function", "IHDR");
260
261 if (png_ptr == NULL || info_ptr == NULL)
262 return;
263
264 info_ptr->width = width;
265 info_ptr->height = height;
266 info_ptr->bit_depth = (png_byte)bit_depth;
267 info_ptr->color_type = (png_byte)color_type;
268 info_ptr->compression_type = (png_byte)compression_type;
269 info_ptr->filter_type = (png_byte)filter_type;
270 info_ptr->interlace_type = (png_byte)interlace_type;
271
272 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
273 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
274 info_ptr->compression_type, info_ptr->filter_type);
275
276 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
277 info_ptr->channels = 1;
278
279 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
280 info_ptr->channels = 3;
281
282 else
283 info_ptr->channels = 1;
284
285 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
286 info_ptr->channels++;
287
288 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
289
290 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
291}
292
293#ifdef PNG_oFFs_SUPPORTED
294void PNGAPI
295png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
296 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
297{
298 png_debug1(1, "in %s storage function", "oFFs");
299
300 if (png_ptr == NULL || info_ptr == NULL)
301 return;
302
303 info_ptr->x_offset = offset_x;
304 info_ptr->y_offset = offset_y;
305 info_ptr->offset_unit_type = (png_byte)unit_type;
306 info_ptr->valid |= PNG_INFO_oFFs;
307}
308#endif
309
310#ifdef PNG_pCAL_SUPPORTED
311void PNGAPI
312png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
313 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
314 int nparams, png_const_charp units, png_charpp params)
315{
316 size_t length;
317 int i;
318
319 png_debug1(1, "in %s storage function", "pCAL");
320
321 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
322 || (nparams > 0 && params == NULL))
323 return;
324
325 length = strlen(purpose) + 1;
326 png_debug1(3, "allocating purpose for info (%lu bytes)",
327 (unsigned long)length);
328
329 /* TODO: validate format of calibration name and unit name */
330
331 /* Check that the type matches the specification. */
332 if (type < 0 || type > 3)
333 {
334 png_chunk_report(png_ptr, "Invalid pCAL equation type",
335 PNG_CHUNK_WRITE_ERROR);
336 return;
337 }
338
339 if (nparams < 0 || nparams > 255)
340 {
341 png_chunk_report(png_ptr, "Invalid pCAL parameter count",
342 PNG_CHUNK_WRITE_ERROR);
343 return;
344 }
345
346 /* Validate params[nparams] */
347 for (i=0; i<nparams; ++i)
348 {
349 if (params[i] == NULL ||
350 !png_check_fp_string(params[i], strlen(params[i])))
351 {
352 png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
353 PNG_CHUNK_WRITE_ERROR);
354 return;
355 }
356 }
357
358 info_ptr->pcal_purpose = png_voidcast(png_charp,
359 png_malloc_warn(png_ptr, length));
360
361 if (info_ptr->pcal_purpose == NULL)
362 {
363 png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
364 PNG_CHUNK_WRITE_ERROR);
365 return;
366 }
367
368 memcpy(info_ptr->pcal_purpose, purpose, length);
369
370 png_debug(3, "storing X0, X1, type, and nparams in info");
371 info_ptr->pcal_X0 = X0;
372 info_ptr->pcal_X1 = X1;
373 info_ptr->pcal_type = (png_byte)type;
374 info_ptr->pcal_nparams = (png_byte)nparams;
375
376 length = strlen(units) + 1;
377 png_debug1(3, "allocating units for info (%lu bytes)",
378 (unsigned long)length);
379
380 info_ptr->pcal_units = png_voidcast(png_charp,
381 png_malloc_warn(png_ptr, length));
382
383 if (info_ptr->pcal_units == NULL)
384 {
385 png_warning(png_ptr, "Insufficient memory for pCAL units");
386
387 return;
388 }
389
390 memcpy(info_ptr->pcal_units, units, length);
391
392 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
393 (size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
394
395 if (info_ptr->pcal_params == NULL)
396 {
397 png_warning(png_ptr, "Insufficient memory for pCAL params");
398
399 return;
400 }
401
402 memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
403 (sizeof (png_charp)));
404
405 for (i = 0; i < nparams; i++)
406 {
407 length = strlen(params[i]) + 1;
408 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
409 (unsigned long)length);
410
411 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
412
413 if (info_ptr->pcal_params[i] == NULL)
414 {
415 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
416
417 return;
418 }
419
420 memcpy(info_ptr->pcal_params[i], params[i], length);
421 }
422
423 info_ptr->valid |= PNG_INFO_pCAL;
424 info_ptr->free_me |= PNG_FREE_PCAL;
425}
426#endif
427
428#ifdef PNG_sCAL_SUPPORTED
429void PNGAPI
430png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
431 int unit, png_const_charp swidth, png_const_charp sheight)
432{
433 size_t lengthw = 0, lengthh = 0;
434
435 png_debug1(1, "in %s storage function", "sCAL");
436
437 if (png_ptr == NULL || info_ptr == NULL)
438 return;
439
440 /* Double check the unit (should never get here with an invalid
441 * unit unless this is an API call.)
442 */
443 if (unit != 1 && unit != 2)
444 png_error(png_ptr, "Invalid sCAL unit");
445
446 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
447 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
448 png_error(png_ptr, "Invalid sCAL width");
449
450 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
451 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
452 png_error(png_ptr, "Invalid sCAL height");
453
454 info_ptr->scal_unit = (png_byte)unit;
455
456 ++lengthw;
457
458 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
459
460 info_ptr->scal_s_width = png_voidcast(png_charp,
461 png_malloc_warn(png_ptr, lengthw));
462
463 if (info_ptr->scal_s_width == NULL)
464 {
465 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
466
467 return;
468 }
469
470 memcpy(info_ptr->scal_s_width, swidth, lengthw);
471
472 ++lengthh;
473
474 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
475
476 info_ptr->scal_s_height = png_voidcast(png_charp,
477 png_malloc_warn(png_ptr, lengthh));
478
479 if (info_ptr->scal_s_height == NULL)
480 {
481 png_free (png_ptr, info_ptr->scal_s_width);
482 info_ptr->scal_s_width = NULL;
483
484 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
485
486 return;
487 }
488
489 memcpy(info_ptr->scal_s_height, sheight, lengthh);
490
491 info_ptr->valid |= PNG_INFO_sCAL;
492 info_ptr->free_me |= PNG_FREE_SCAL;
493}
494
495# ifdef PNG_FLOATING_POINT_SUPPORTED
496void PNGAPI
497png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
498 double width, double height)
499{
500 png_debug1(1, "in %s storage function", "sCAL");
501
502 /* Check the arguments. */
503 if (width <= 0)
504 png_warning(png_ptr, "Invalid sCAL width ignored");
505
506 else if (height <= 0)
507 png_warning(png_ptr, "Invalid sCAL height ignored");
508
509 else
510 {
511 /* Convert 'width' and 'height' to ASCII. */
512 char swidth[PNG_sCAL_MAX_DIGITS+1];
513 char sheight[PNG_sCAL_MAX_DIGITS+1];
514
515 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
516 PNG_sCAL_PRECISION);
517 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
518 PNG_sCAL_PRECISION);
519
520 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
521 }
522}
523# endif
524
525# ifdef PNG_FIXED_POINT_SUPPORTED
526void PNGAPI
527png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
528 png_fixed_point width, png_fixed_point height)
529{
530 png_debug1(1, "in %s storage function", "sCAL");
531
532 /* Check the arguments. */
533 if (width <= 0)
534 png_warning(png_ptr, "Invalid sCAL width ignored");
535
536 else if (height <= 0)
537 png_warning(png_ptr, "Invalid sCAL height ignored");
538
539 else
540 {
541 /* Convert 'width' and 'height' to ASCII. */
542 char swidth[PNG_sCAL_MAX_DIGITS+1];
543 char sheight[PNG_sCAL_MAX_DIGITS+1];
544
545 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
546 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
547
548 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
549 }
550}
551# endif
552#endif
553
554#ifdef PNG_pHYs_SUPPORTED
555void PNGAPI
556png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
557 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
558{
559 png_debug1(1, "in %s storage function", "pHYs");
560
561 if (png_ptr == NULL || info_ptr == NULL)
562 return;
563
564 info_ptr->x_pixels_per_unit = res_x;
565 info_ptr->y_pixels_per_unit = res_y;
566 info_ptr->phys_unit_type = (png_byte)unit_type;
567 info_ptr->valid |= PNG_INFO_pHYs;
568}
569#endif
570
571void PNGAPI
572png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
573 png_const_colorp palette, int num_palette)
574{
575
576 png_uint_32 max_palette_length;
577
578 png_debug1(1, "in %s storage function", "PLTE");
579
580 if (png_ptr == NULL || info_ptr == NULL)
581 return;
582
583 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
584 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
585
586 if (num_palette < 0 || num_palette > (int) max_palette_length)
587 {
588 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
589 png_error(png_ptr, "Invalid palette length");
590
591 else
592 {
593 png_warning(png_ptr, "Invalid palette length");
594
595 return;
596 }
597 }
598
599 if ((num_palette > 0 && palette == NULL) ||
600 (num_palette == 0
601# ifdef PNG_MNG_FEATURES_SUPPORTED
602 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
603# endif
604 ))
605 {
606 png_error(png_ptr, "Invalid palette");
607 }
608
609 /* It may not actually be necessary to set png_ptr->palette here;
610 * we do it for backward compatibility with the way the png_handle_tRNS
611 * function used to do the allocation.
612 *
613 * 1.6.0: the above statement appears to be incorrect; something has to set
614 * the palette inside png_struct on read.
615 */
616 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
617
618 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
619 * of num_palette entries, in case of an invalid PNG file or incorrect
620 * call to png_set_PLTE() with too-large sample values.
621 */
622 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
623 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
624
625 if (num_palette > 0)
626 memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
627 (sizeof (png_color)));
628 info_ptr->palette = png_ptr->palette;
629 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
630
631 info_ptr->free_me |= PNG_FREE_PLTE;
632
633 info_ptr->valid |= PNG_INFO_PLTE;
634}
635
636#ifdef PNG_sBIT_SUPPORTED
637void PNGAPI
638png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
639 png_const_color_8p sig_bit)
640{
641 png_debug1(1, "in %s storage function", "sBIT");
642
643 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
644 return;
645
646 info_ptr->sig_bit = *sig_bit;
647 info_ptr->valid |= PNG_INFO_sBIT;
648}
649#endif
650
651#ifdef PNG_sRGB_SUPPORTED
652void PNGAPI
653png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
654{
655 png_debug1(1, "in %s storage function", "sRGB");
656
657 if (png_ptr == NULL || info_ptr == NULL)
658 return;
659
660 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
661 png_colorspace_sync_info(png_ptr, info_ptr);
662}
663
664void PNGAPI
665png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
666 int srgb_intent)
667{
668 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
669
670 if (png_ptr == NULL || info_ptr == NULL)
671 return;
672
673 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
674 srgb_intent) != 0)
675 {
676 /* This causes the gAMA and cHRM to be written too */
677 info_ptr->colorspace.flags |=
678 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
679 }
680
681 png_colorspace_sync_info(png_ptr, info_ptr);
682}
683#endif /* sRGB */
684
685
686#ifdef PNG_iCCP_SUPPORTED
687void PNGAPI
688png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
689 png_const_charp name, int compression_type,
690 png_const_bytep profile, png_uint_32 proflen)
691{
692 png_charp new_iccp_name;
693 png_bytep new_iccp_profile;
694 size_t length;
695
696 png_debug1(1, "in %s storage function", "iCCP");
697
698 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
699 return;
700
701 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
702 png_app_error(png_ptr, "Invalid iCCP compression method");
703
704 /* Set the colorspace first because this validates the profile; do not
705 * override previously set app cHRM or gAMA here (because likely as not the
706 * application knows better than libpng what the correct values are.) Pass
707 * the info_ptr color_type field to png_colorspace_set_ICC because in the
708 * write case it has not yet been stored in png_ptr.
709 */
710 {
711 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
712 proflen, profile, info_ptr->color_type);
713
714 png_colorspace_sync_info(png_ptr, info_ptr);
715
716 /* Don't do any of the copying if the profile was bad, or inconsistent. */
717 if (result == 0)
718 return;
719
720 /* But do write the gAMA and cHRM chunks from the profile. */
721 info_ptr->colorspace.flags |=
722 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
723 }
724
725 length = strlen(name)+1;
726 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
727
728 if (new_iccp_name == NULL)
729 {
730 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
731
732 return;
733 }
734
735 memcpy(new_iccp_name, name, length);
736 new_iccp_profile = png_voidcast(png_bytep,
737 png_malloc_warn(png_ptr, proflen));
738
739 if (new_iccp_profile == NULL)
740 {
741 png_free(png_ptr, new_iccp_name);
742 png_benign_error(png_ptr,
743 "Insufficient memory to process iCCP profile");
744
745 return;
746 }
747
748 memcpy(new_iccp_profile, profile, proflen);
749
750 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
751
752 info_ptr->iccp_proflen = proflen;
753 info_ptr->iccp_name = new_iccp_name;
754 info_ptr->iccp_profile = new_iccp_profile;
755 info_ptr->free_me |= PNG_FREE_ICCP;
756 info_ptr->valid |= PNG_INFO_iCCP;
757}
758#endif
759
760#ifdef PNG_TEXT_SUPPORTED
761void PNGAPI
762png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
763 png_const_textp text_ptr, int num_text)
764{
765 int ret;
766 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
767
768 if (ret != 0)
769 png_error(png_ptr, "Insufficient memory to store text");
770}
771
772int /* PRIVATE */
773png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
774 png_const_textp text_ptr, int num_text)
775{
776 int i;
777
778 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
779 (unsigned long)png_ptr->chunk_name);
780
781 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
782 return(0);
783
784 /* Make sure we have enough space in the "text" array in info_struct
785 * to hold all of the incoming text_ptr objects. This compare can't overflow
786 * because max_text >= num_text (anyway, subtract of two positive integers
787 * can't overflow in any case.)
788 */
789 if (num_text > info_ptr->max_text - info_ptr->num_text)
790 {
791 int old_num_text = info_ptr->num_text;
792 int max_text;
793 png_textp new_text = NULL;
794
795 /* Calculate an appropriate max_text, checking for overflow. */
796 max_text = old_num_text;
797 if (num_text <= INT_MAX - max_text)
798 {
799 max_text += num_text;
800
801 /* Round up to a multiple of 8 */
802 if (max_text < INT_MAX-8)
803 max_text = (max_text + 8) & ~0x7;
804
805 else
806 max_text = INT_MAX;
807
808 /* Now allocate a new array and copy the old members in; this does all
809 * the overflow checks.
810 */
811 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
812 info_ptr->text, old_num_text, max_text-old_num_text,
813 sizeof *new_text));
814 }
815
816 if (new_text == NULL)
817 {
818 png_chunk_report(png_ptr, "too many text chunks",
819 PNG_CHUNK_WRITE_ERROR);
820
821 return 1;
822 }
823
824 png_free(png_ptr, info_ptr->text);
825
826 info_ptr->text = new_text;
827 info_ptr->free_me |= PNG_FREE_TEXT;
828 info_ptr->max_text = max_text;
829 /* num_text is adjusted below as the entries are copied in */
830
831 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
832 }
833
834 for (i = 0; i < num_text; i++)
835 {
836 size_t text_length, key_len;
837 size_t lang_len, lang_key_len;
838 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
839
840 if (text_ptr[i].key == NULL)
841 continue;
842
843 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
844 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
845 {
846 png_chunk_report(png_ptr, "text compression mode is out of range",
847 PNG_CHUNK_WRITE_ERROR);
848 continue;
849 }
850
851 key_len = strlen(text_ptr[i].key);
852
853 if (text_ptr[i].compression <= 0)
854 {
855 lang_len = 0;
856 lang_key_len = 0;
857 }
858
859 else
860# ifdef PNG_iTXt_SUPPORTED
861 {
862 /* Set iTXt data */
863
864 if (text_ptr[i].lang != NULL)
865 lang_len = strlen(text_ptr[i].lang);
866
867 else
868 lang_len = 0;
869
870 if (text_ptr[i].lang_key != NULL)
871 lang_key_len = strlen(text_ptr[i].lang_key);
872
873 else
874 lang_key_len = 0;
875 }
876# else /* iTXt */
877 {
878 png_chunk_report(png_ptr, "iTXt chunk not supported",
879 PNG_CHUNK_WRITE_ERROR);
880 continue;
881 }
882# endif
883
884 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
885 {
886 text_length = 0;
887# ifdef PNG_iTXt_SUPPORTED
888 if (text_ptr[i].compression > 0)
889 textp->compression = PNG_ITXT_COMPRESSION_NONE;
890
891 else
892# endif
893 textp->compression = PNG_TEXT_COMPRESSION_NONE;
894 }
895
896 else
897 {
898 text_length = strlen(text_ptr[i].text);
899 textp->compression = text_ptr[i].compression;
900 }
901
902 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
903 key_len + text_length + lang_len + lang_key_len + 4));
904
905 if (textp->key == NULL)
906 {
907 png_chunk_report(png_ptr, "text chunk: out of memory",
908 PNG_CHUNK_WRITE_ERROR);
909
910 return 1;
911 }
912
913 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
914 (unsigned long)(png_uint_32)
915 (key_len + lang_len + lang_key_len + text_length + 4),
916 textp->key);
917
918 memcpy(textp->key, text_ptr[i].key, key_len);
919 *(textp->key + key_len) = '\0';
920
921 if (text_ptr[i].compression > 0)
922 {
923 textp->lang = textp->key + key_len + 1;
924 memcpy(textp->lang, text_ptr[i].lang, lang_len);
925 *(textp->lang + lang_len) = '\0';
926 textp->lang_key = textp->lang + lang_len + 1;
927 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
928 *(textp->lang_key + lang_key_len) = '\0';
929 textp->text = textp->lang_key + lang_key_len + 1;
930 }
931
932 else
933 {
934 textp->lang=NULL;
935 textp->lang_key=NULL;
936 textp->text = textp->key + key_len + 1;
937 }
938
939 if (text_length != 0)
940 memcpy(textp->text, text_ptr[i].text, text_length);
941
942 *(textp->text + text_length) = '\0';
943
944# ifdef PNG_iTXt_SUPPORTED
945 if (textp->compression > 0)
946 {
947 textp->text_length = 0;
948 textp->itxt_length = text_length;
949 }
950
951 else
952# endif
953 {
954 textp->text_length = text_length;
955 textp->itxt_length = 0;
956 }
957
958 info_ptr->num_text++;
959 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
960 }
961
962 return(0);
963}
964#endif
965
966#ifdef PNG_tIME_SUPPORTED
967void PNGAPI
968png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
969 png_const_timep mod_time)
970{
971 png_debug1(1, "in %s storage function", "tIME");
972
973 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
974 (png_ptr->mode & PNG_WROTE_tIME) != 0)
975 return;
976
977 if (mod_time->month == 0 || mod_time->month > 12 ||
978 mod_time->day == 0 || mod_time->day > 31 ||
979 mod_time->hour > 23 || mod_time->minute > 59 ||
980 mod_time->second > 60)
981 {
982 png_warning(png_ptr, "Ignoring invalid time value");
983
984 return;
985 }
986
987 info_ptr->mod_time = *mod_time;
988 info_ptr->valid |= PNG_INFO_tIME;
989}
990#endif
991
992#ifdef PNG_tRNS_SUPPORTED
993void PNGAPI
994png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
995 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
996{
997 png_debug1(1, "in %s storage function", "tRNS");
998
999 if (png_ptr == NULL || info_ptr == NULL)
1000
1001 return;
1002
1003 if (trans_alpha != NULL)
1004 {
1005 /* It may not actually be necessary to set png_ptr->trans_alpha here;
1006 * we do it for backward compatibility with the way the png_handle_tRNS
1007 * function used to do the allocation.
1008 *
1009 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
1010 * relies on png_set_tRNS storing the information in png_struct
1011 * (otherwise it won't be there for the code in pngrtran.c).
1012 */
1013
1014 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
1015
1016 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
1017 {
1018 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
1019 info_ptr->trans_alpha = png_voidcast(png_bytep,
1020 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
1021 memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
1022 }
1023 png_ptr->trans_alpha = info_ptr->trans_alpha;
1024 }
1025
1026 if (trans_color != NULL)
1027 {
1028#ifdef PNG_WARNINGS_SUPPORTED
1029 if (info_ptr->bit_depth < 16)
1030 {
1031 int sample_max = (1 << info_ptr->bit_depth) - 1;
1032
1033 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
1034 trans_color->gray > sample_max) ||
1035 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
1036 (trans_color->red > sample_max ||
1037 trans_color->green > sample_max ||
1038 trans_color->blue > sample_max)))
1039 png_warning(png_ptr,
1040 "tRNS chunk has out-of-range samples for bit_depth");
1041 }
1042#endif
1043
1044 info_ptr->trans_color = *trans_color;
1045
1046 if (num_trans == 0)
1047 num_trans = 1;
1048 }
1049
1050 info_ptr->num_trans = (png_uint_16)num_trans;
1051
1052 if (num_trans != 0)
1053 {
1054 info_ptr->valid |= PNG_INFO_tRNS;
1055 info_ptr->free_me |= PNG_FREE_TRNS;
1056 }
1057}
1058#endif
1059
1060#ifdef PNG_sPLT_SUPPORTED
1061void PNGAPI
1062png_set_sPLT(png_const_structrp png_ptr,
1063 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1064/*
1065 * entries - array of png_sPLT_t structures
1066 * to be added to the list of palettes
1067 * in the info structure.
1068 *
1069 * nentries - number of palette structures to be
1070 * added.
1071 */
1072{
1073 png_sPLT_tp np;
1074
1075 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1076 return;
1077
1078 /* Use the internal realloc function, which checks for all the possible
1079 * overflows. Notice that the parameters are (int) and (size_t)
1080 */
1081 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1082 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1083 sizeof *np));
1084
1085 if (np == NULL)
1086 {
1087 /* Out of memory or too many chunks */
1088 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1089
1090 return;
1091 }
1092
1093 png_free(png_ptr, info_ptr->splt_palettes);
1094 info_ptr->splt_palettes = np;
1095 info_ptr->free_me |= PNG_FREE_SPLT;
1096
1097 np += info_ptr->splt_palettes_num;
1098
1099 do
1100 {
1101 size_t length;
1102
1103 /* Skip invalid input entries */
1104 if (entries->name == NULL || entries->entries == NULL)
1105 {
1106 /* png_handle_sPLT doesn't do this, so this is an app error */
1107 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1108 /* Just skip the invalid entry */
1109 continue;
1110 }
1111
1112 np->depth = entries->depth;
1113
1114 /* In the event of out-of-memory just return - there's no point keeping
1115 * on trying to add sPLT chunks.
1116 */
1117 length = strlen(entries->name) + 1;
1118 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1119
1120 if (np->name == NULL)
1121 break;
1122
1123 memcpy(np->name, entries->name, length);
1124
1125 /* IMPORTANT: we have memory now that won't get freed if something else
1126 * goes wrong; this code must free it. png_malloc_array produces no
1127 * warnings; use a png_chunk_report (below) if there is an error.
1128 */
1129 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1130 entries->nentries, sizeof (png_sPLT_entry)));
1131
1132 if (np->entries == NULL)
1133 {
1134 png_free(png_ptr, np->name);
1135 np->name = NULL;
1136 break;
1137 }
1138
1139 np->nentries = entries->nentries;
1140 /* This multiply can't overflow because png_malloc_array has already
1141 * checked it when doing the allocation.
1142 */
1143 memcpy(np->entries, entries->entries,
1144 (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
1145
1146 /* Note that 'continue' skips the advance of the out pointer and out
1147 * count, so an invalid entry is not added.
1148 */
1149 info_ptr->valid |= PNG_INFO_sPLT;
1150 ++(info_ptr->splt_palettes_num);
1151 ++np;
1152 ++entries;
1153 }
1154 while (--nentries);
1155
1156 if (nentries > 0)
1157 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1158}
1159#endif /* sPLT */
1160
1161#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1162static png_byte
1163check_location(png_const_structrp png_ptr, int location)
1164{
1165 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1166
1167 /* New in 1.6.0; copy the location and check it. This is an API
1168 * change; previously the app had to use the
1169 * png_set_unknown_chunk_location API below for each chunk.
1170 */
1171 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1172 {
1173 /* Write struct, so unknown chunks come from the app */
1174 png_app_warning(png_ptr,
1175 "png_set_unknown_chunks now expects a valid location");
1176 /* Use the old behavior */
1177 location = (png_byte)(png_ptr->mode &
1178 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1179 }
1180
1181 /* This need not be an internal error - if the app calls
1182 * png_set_unknown_chunks on a read pointer it must get the location right.
1183 */
1184 if (location == 0)
1185 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1186
1187 /* Now reduce the location to the top-most set bit by removing each least
1188 * significant bit in turn.
1189 */
1190 while (location != (location & -location))
1191 location &= ~(location & -location);
1192
1193 /* The cast is safe because 'location' is a bit mask and only the low four
1194 * bits are significant.
1195 */
1196 return (png_byte)location;
1197}
1198
1199void PNGAPI
1200png_set_unknown_chunks(png_const_structrp png_ptr,
1201 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1202{
1203 png_unknown_chunkp np;
1204
1205 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1206 unknowns == NULL)
1207 return;
1208
1209 /* Check for the failure cases where support has been disabled at compile
1210 * time. This code is hardly ever compiled - it's here because
1211 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1212 * code) but may be meaningless if the read or write handling of unknown
1213 * chunks is not compiled in.
1214 */
1215# if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1216 defined(PNG_READ_SUPPORTED)
1217 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1218 {
1219 png_app_error(png_ptr, "no unknown chunk support on read");
1220
1221 return;
1222 }
1223# endif
1224# if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1225 defined(PNG_WRITE_SUPPORTED)
1226 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1227 {
1228 png_app_error(png_ptr, "no unknown chunk support on write");
1229
1230 return;
1231 }
1232# endif
1233
1234 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1235 * unknown critical chunks could be lost with just a warning resulting in
1236 * undefined behavior. Now png_chunk_report is used to provide behavior
1237 * appropriate to read or write.
1238 */
1239 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1240 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1241 sizeof *np));
1242
1243 if (np == NULL)
1244 {
1245 png_chunk_report(png_ptr, "too many unknown chunks",
1246 PNG_CHUNK_WRITE_ERROR);
1247
1248 return;
1249 }
1250
1251 png_free(png_ptr, info_ptr->unknown_chunks);
1252 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1253 info_ptr->free_me |= PNG_FREE_UNKN;
1254
1255 np += info_ptr->unknown_chunks_num;
1256
1257 /* Increment unknown_chunks_num each time round the loop to protect the
1258 * just-allocated chunk data.
1259 */
1260 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1261 {
1262 memcpy(np->name, unknowns->name, (sizeof np->name));
1263 np->name[(sizeof np->name)-1] = '\0';
1264 np->location = check_location(png_ptr, unknowns->location);
1265
1266 if (unknowns->size == 0)
1267 {
1268 np->data = NULL;
1269 np->size = 0;
1270 }
1271
1272 else
1273 {
1274 np->data = png_voidcast(png_bytep,
1275 png_malloc_base(png_ptr, unknowns->size));
1276
1277 if (np->data == NULL)
1278 {
1279 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1280 PNG_CHUNK_WRITE_ERROR);
1281 /* But just skip storing the unknown chunk */
1282 continue;
1283 }
1284
1285 memcpy(np->data, unknowns->data, unknowns->size);
1286 np->size = unknowns->size;
1287 }
1288
1289 /* These increments are skipped on out-of-memory for the data - the
1290 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1291 * This is correct in the read case (the chunk is just dropped.)
1292 */
1293 ++np;
1294 ++(info_ptr->unknown_chunks_num);
1295 }
1296}
1297
1298void PNGAPI
1299png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1300 int chunk, int location)
1301{
1302 /* This API is pretty pointless in 1.6.0 because the location can be set
1303 * before the call to png_set_unknown_chunks.
1304 *
1305 * TODO: add a png_app_warning in 1.7
1306 */
1307 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1308 chunk < info_ptr->unknown_chunks_num)
1309 {
1310 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1311 {
1312 png_app_error(png_ptr, "invalid unknown chunk location");
1313 /* Fake out the pre 1.6.0 behavior: */
1314 if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1315 location = PNG_AFTER_IDAT;
1316
1317 else
1318 location = PNG_HAVE_IHDR; /* also undocumented */
1319 }
1320
1321 info_ptr->unknown_chunks[chunk].location =
1322 check_location(png_ptr, location);
1323 }
1324}
1325#endif /* STORE_UNKNOWN_CHUNKS */
1326
1327#ifdef PNG_MNG_FEATURES_SUPPORTED
1328png_uint_32 PNGAPI
1329png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1330{
1331 png_debug(1, "in png_permit_mng_features");
1332
1333 if (png_ptr == NULL)
1334 return 0;
1335
1336 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1337
1338 return png_ptr->mng_features_permitted;
1339}
1340#endif
1341
1342#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1343static unsigned int
1344add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1345{
1346 unsigned int i;
1347
1348 /* Utility function: update the 'keep' state of a chunk if it is already in
1349 * the list, otherwise add it to the list.
1350 */
1351 for (i=0; i<count; ++i, list += 5)
1352 {
1353 if (memcmp(list, add, 4) == 0)
1354 {
1355 list[4] = (png_byte)keep;
1356
1357 return count;
1358 }
1359 }
1360
1361 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1362 {
1363 ++count;
1364 memcpy(list, add, 4);
1365 list[4] = (png_byte)keep;
1366 }
1367
1368 return count;
1369}
1370
1371void PNGAPI
1372png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1373 png_const_bytep chunk_list, int num_chunks_in)
1374{
1375 png_bytep new_list;
1376 unsigned int num_chunks, old_num_chunks;
1377
1378 if (png_ptr == NULL)
1379 return;
1380
1381 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1382 {
1383 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1384
1385 return;
1386 }
1387
1388 if (num_chunks_in <= 0)
1389 {
1390 png_ptr->unknown_default = keep;
1391
1392 /* '0' means just set the flags, so stop here */
1393 if (num_chunks_in == 0)
1394 return;
1395 }
1396
1397 if (num_chunks_in < 0)
1398 {
1399 /* Ignore all unknown chunks and all chunks recognized by
1400 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1401 */
1402 static const png_byte chunks_to_ignore[] = {
1403 98, 75, 71, 68, '\0', /* bKGD */
1404 99, 72, 82, 77, '\0', /* cHRM */
1405 101, 88, 73, 102, '\0', /* eXIf */
1406 103, 65, 77, 65, '\0', /* gAMA */
1407 104, 73, 83, 84, '\0', /* hIST */
1408 105, 67, 67, 80, '\0', /* iCCP */
1409 105, 84, 88, 116, '\0', /* iTXt */
1410 111, 70, 70, 115, '\0', /* oFFs */
1411 112, 67, 65, 76, '\0', /* pCAL */
1412 112, 72, 89, 115, '\0', /* pHYs */
1413 115, 66, 73, 84, '\0', /* sBIT */
1414 115, 67, 65, 76, '\0', /* sCAL */
1415 115, 80, 76, 84, '\0', /* sPLT */
1416 115, 84, 69, 82, '\0', /* sTER */
1417 115, 82, 71, 66, '\0', /* sRGB */
1418 116, 69, 88, 116, '\0', /* tEXt */
1419 116, 73, 77, 69, '\0', /* tIME */
1420 122, 84, 88, 116, '\0' /* zTXt */
1421 };
1422
1423 chunk_list = chunks_to_ignore;
1424 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1425 }
1426
1427 else /* num_chunks_in > 0 */
1428 {
1429 if (chunk_list == NULL)
1430 {
1431 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1432 * which can be switched off.
1433 */
1434 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1435
1436 return;
1437 }
1438
1439 num_chunks = (unsigned int)num_chunks_in;
1440 }
1441
1442 old_num_chunks = png_ptr->num_chunk_list;
1443 if (png_ptr->chunk_list == NULL)
1444 old_num_chunks = 0;
1445
1446 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1447 */
1448 if (num_chunks + old_num_chunks > UINT_MAX/5)
1449 {
1450 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1451
1452 return;
1453 }
1454
1455 /* If these chunks are being reset to the default then no more memory is
1456 * required because add_one_chunk above doesn't extend the list if the 'keep'
1457 * parameter is the default.
1458 */
1459 if (keep != 0)
1460 {
1461 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1462 5 * (num_chunks + old_num_chunks)));
1463
1464 if (old_num_chunks > 0)
1465 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1466 }
1467
1468 else if (old_num_chunks > 0)
1469 new_list = png_ptr->chunk_list;
1470
1471 else
1472 new_list = NULL;
1473
1474 /* Add the new chunks together with each one's handling code. If the chunk
1475 * already exists the code is updated, otherwise the chunk is added to the
1476 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1477 * the earlier convention that the last setting is the one that is used.)
1478 */
1479 if (new_list != NULL)
1480 {
1481 png_const_bytep inlist;
1482 png_bytep outlist;
1483 unsigned int i;
1484
1485 for (i=0; i<num_chunks; ++i)
1486 {
1487 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1488 chunk_list+5*i, keep);
1489 }
1490
1491 /* Now remove any spurious 'default' entries. */
1492 num_chunks = 0;
1493 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1494 {
1495 if (inlist[4])
1496 {
1497 if (outlist != inlist)
1498 memcpy(outlist, inlist, 5);
1499 outlist += 5;
1500 ++num_chunks;
1501 }
1502 }
1503
1504 /* This means the application has removed all the specialized handling. */
1505 if (num_chunks == 0)
1506 {
1507 if (png_ptr->chunk_list != new_list)
1508 png_free(png_ptr, new_list);
1509
1510 new_list = NULL;
1511 }
1512 }
1513
1514 else
1515 num_chunks = 0;
1516
1517 png_ptr->num_chunk_list = num_chunks;
1518
1519 if (png_ptr->chunk_list != new_list)
1520 {
1521 if (png_ptr->chunk_list != NULL)
1522 png_free(png_ptr, png_ptr->chunk_list);
1523
1524 png_ptr->chunk_list = new_list;
1525 }
1526}
1527#endif
1528
1529#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1530void PNGAPI
1531png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1532 png_user_chunk_ptr read_user_chunk_fn)
1533{
1534 png_debug(1, "in png_set_read_user_chunk_fn");
1535
1536 if (png_ptr == NULL)
1537 return;
1538
1539 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1540 png_ptr->user_chunk_ptr = user_chunk_ptr;
1541}
1542#endif
1543
1544#ifdef PNG_INFO_IMAGE_SUPPORTED
1545void PNGAPI
1546png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1547 png_bytepp row_pointers)
1548{
1549 png_debug1(1, "in %s storage function", "rows");
1550
1551 if (png_ptr == NULL || info_ptr == NULL)
1552 return;
1553
1554 if (info_ptr->row_pointers != NULL &&
1555 (info_ptr->row_pointers != row_pointers))
1556 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1557
1558 info_ptr->row_pointers = row_pointers;
1559
1560 if (row_pointers != NULL)
1561 info_ptr->valid |= PNG_INFO_IDAT;
1562}
1563#endif
1564
1565void PNGAPI
1566png_set_compression_buffer_size(png_structrp png_ptr, size_t size)
1567{
1568 if (png_ptr == NULL)
1569 return;
1570
1571 if (size == 0 || size > PNG_UINT_31_MAX)
1572 png_error(png_ptr, "invalid compression buffer size");
1573
1574# ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1575 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1576 {
1577 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1578 return;
1579 }
1580# endif
1581
1582# ifdef PNG_WRITE_SUPPORTED
1583 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1584 {
1585 if (png_ptr->zowner != 0)
1586 {
1587 png_warning(png_ptr,
1588 "Compression buffer size cannot be changed because it is in use");
1589
1590 return;
1591 }
1592
1593#ifndef __COVERITY__
1594 /* Some compilers complain that this is always false. However, it
1595 * can be true when integer overflow happens.
1596 */
1597 if (size > ZLIB_IO_MAX)
1598 {
1599 png_warning(png_ptr,
1600 "Compression buffer size limited to system maximum");
1601 size = ZLIB_IO_MAX; /* must fit */
1602 }
1603#endif
1604
1605 if (size < 6)
1606 {
1607 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1608 * if this is permitted.
1609 */
1610 png_warning(png_ptr,
1611 "Compression buffer size cannot be reduced below 6");
1612
1613 return;
1614 }
1615
1616 if (png_ptr->zbuffer_size != size)
1617 {
1618 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1619 png_ptr->zbuffer_size = (uInt)size;
1620 }
1621 }
1622# endif
1623}
1624
1625void PNGAPI
1626png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1627{
1628 if (png_ptr != NULL && info_ptr != NULL)
1629 info_ptr->valid &= (unsigned int)(~mask);
1630}
1631
1632
1633#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1634/* This function was added to libpng 1.2.6 */
1635void PNGAPI
1636png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1637 png_uint_32 user_height_max)
1638{
1639 /* Images with dimensions larger than these limits will be
1640 * rejected by png_set_IHDR(). To accept any PNG datastream
1641 * regardless of dimensions, set both limits to 0x7fffffff.
1642 */
1643 if (png_ptr == NULL)
1644 return;
1645
1646 png_ptr->user_width_max = user_width_max;
1647 png_ptr->user_height_max = user_height_max;
1648}
1649
1650/* This function was added to libpng 1.4.0 */
1651void PNGAPI
1652png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1653{
1654 if (png_ptr != NULL)
1655 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1656}
1657
1658/* This function was added to libpng 1.4.1 */
1659void PNGAPI
1660png_set_chunk_malloc_max (png_structrp png_ptr,
1661 png_alloc_size_t user_chunk_malloc_max)
1662{
1663 if (png_ptr != NULL)
1664 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1665}
1666#endif /* ?SET_USER_LIMITS */
1667
1668
1669#ifdef PNG_BENIGN_ERRORS_SUPPORTED
1670void PNGAPI
1671png_set_benign_errors(png_structrp png_ptr, int allowed)
1672{
1673 png_debug(1, "in png_set_benign_errors");
1674
1675 /* If allowed is 1, png_benign_error() is treated as a warning.
1676 *
1677 * If allowed is 0, png_benign_error() is treated as an error (which
1678 * is the default behavior if png_set_benign_errors() is not called).
1679 */
1680
1681 if (allowed != 0)
1682 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1683 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1684
1685 else
1686 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1687 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1688}
1689#endif /* BENIGN_ERRORS */
1690
1691#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1692 /* Whether to report invalid palette index; added at libng-1.5.10.
1693 * It is possible for an indexed (color-type==3) PNG file to contain
1694 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1695 * fewer entries than the image's bit-depth would allow. We recover
1696 * from this gracefully by filling any incomplete palette with zeros
1697 * (opaque black). By default, when this occurs libpng will issue
1698 * a benign error. This API can be used to override that behavior.
1699 */
1700void PNGAPI
1701png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1702{
1703 png_debug(1, "in png_set_check_for_invalid_index");
1704
1705 if (allowed > 0)
1706 png_ptr->num_palette_max = 0;
1707
1708 else
1709 png_ptr->num_palette_max = -1;
1710}
1711#endif
1712
1713#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1714 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1715/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1716 * and if invalid, correct the keyword rather than discarding the entire
1717 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1718 * length, forbids leading or trailing whitespace, multiple internal spaces,
1719 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1720 *
1721 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1722 * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1723 * valid one could not be generated, and the caller must png_error.
1724 */
1725png_uint_32 /* PRIVATE */
1726png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1727{
1728#ifdef PNG_WARNINGS_SUPPORTED
1729 png_const_charp orig_key = key;
1730#endif
1731 png_uint_32 key_len = 0;
1732 int bad_character = 0;
1733 int space = 1;
1734
1735 png_debug(1, "in png_check_keyword");
1736
1737 if (key == NULL)
1738 {
1739 *new_key = 0;
1740 return 0;
1741 }
1742
1743 while (*key && key_len < 79)
1744 {
1745 png_byte ch = (png_byte)*key++;
1746
1747 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1748 {
1749 *new_key++ = ch; ++key_len; space = 0;
1750 }
1751
1752 else if (space == 0)
1753 {
1754 /* A space or an invalid character when one wasn't seen immediately
1755 * before; output just a space.
1756 */
1757 *new_key++ = 32; ++key_len; space = 1;
1758
1759 /* If the character was not a space then it is invalid. */
1760 if (ch != 32)
1761 bad_character = ch;
1762 }
1763
1764 else if (bad_character == 0)
1765 bad_character = ch; /* just skip it, record the first error */
1766 }
1767
1768 if (key_len > 0 && space != 0) /* trailing space */
1769 {
1770 --key_len; --new_key;
1771 if (bad_character == 0)
1772 bad_character = 32;
1773 }
1774
1775 /* Terminate the keyword */
1776 *new_key = 0;
1777
1778 if (key_len == 0)
1779 return 0;
1780
1781#ifdef PNG_WARNINGS_SUPPORTED
1782 /* Try to only output one warning per keyword: */
1783 if (*key != 0) /* keyword too long */
1784 png_warning(png_ptr, "keyword truncated");
1785
1786 else if (bad_character != 0)
1787 {
1788 PNG_WARNING_PARAMETERS(p)
1789
1790 png_warning_parameter(p, 1, orig_key);
1791 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1792
1793 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1794 }
1795#else /* !WARNINGS */
1796 PNG_UNUSED(png_ptr)
1797#endif /* !WARNINGS */
1798
1799 return key_len;
1800}
1801#endif /* TEXT || pCAL || iCCP || sPLT */
1802#endif /* READ || WRITE */
1803

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