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comparison: media/libpng/pngset.c

media/libpng/pngset.c

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1
2 /* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.6.8 [December 19, 2013]
5 * Copyright (c) 1998-2013 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 *
13 * The functions here are used during reads to store data from the file
14 * into the info struct, and during writes to store application data
15 * into the info struct for writing into the file. This abstracts the
16 * info struct and allows us to change the structure in the future.
17 */
18
19 #include "pngpriv.h"
20
21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
22
23 #ifdef PNG_bKGD_SUPPORTED
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*/))
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, &XYZ, 2))
94 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
95
96 png_colorspace_sync_info(png_ptr, info_ptr);
97 }
98
99 # ifdef PNG_FLOATING_POINT_SUPPORTED
100 void PNGAPI
101 png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
102 double white_x, double white_y, double red_x, double red_y,
103 double green_x, double green_y, double blue_x, double blue_y)
104 {
105 png_set_cHRM_fixed(png_ptr, info_ptr,
106 png_fixed(png_ptr, white_x, "cHRM White X"),
107 png_fixed(png_ptr, white_y, "cHRM White Y"),
108 png_fixed(png_ptr, red_x, "cHRM Red X"),
109 png_fixed(png_ptr, red_y, "cHRM Red Y"),
110 png_fixed(png_ptr, green_x, "cHRM Green X"),
111 png_fixed(png_ptr, green_y, "cHRM Green Y"),
112 png_fixed(png_ptr, blue_x, "cHRM Blue X"),
113 png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
114 }
115
116 void PNGAPI
117 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
118 double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
119 double blue_X, double blue_Y, double blue_Z)
120 {
121 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
122 png_fixed(png_ptr, red_X, "cHRM Red X"),
123 png_fixed(png_ptr, red_Y, "cHRM Red Y"),
124 png_fixed(png_ptr, red_Z, "cHRM Red Z"),
125 png_fixed(png_ptr, green_X, "cHRM Red X"),
126 png_fixed(png_ptr, green_Y, "cHRM Red Y"),
127 png_fixed(png_ptr, green_Z, "cHRM Red Z"),
128 png_fixed(png_ptr, blue_X, "cHRM Red X"),
129 png_fixed(png_ptr, blue_Y, "cHRM Red Y"),
130 png_fixed(png_ptr, blue_Z, "cHRM Red Z"));
131 }
132 # endif /* PNG_FLOATING_POINT_SUPPORTED */
133
134 #endif /* PNG_cHRM_SUPPORTED */
135
136 #ifdef PNG_gAMA_SUPPORTED
137 void PNGFAPI
138 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
139 png_fixed_point file_gamma)
140 {
141 png_debug1(1, "in %s storage function", "gAMA");
142
143 if (png_ptr == NULL || info_ptr == NULL)
144 return;
145
146 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
147 png_colorspace_sync_info(png_ptr, info_ptr);
148 }
149
150 # ifdef PNG_FLOATING_POINT_SUPPORTED
151 void PNGAPI
152 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
153 {
154 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
155 "png_set_gAMA"));
156 }
157 # endif
158 #endif
159
160 #ifdef PNG_hIST_SUPPORTED
161 void PNGAPI
162 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
163 png_const_uint_16p hist)
164 {
165 int i;
166
167 png_debug1(1, "in %s storage function", "hIST");
168
169 if (png_ptr == NULL || info_ptr == NULL)
170 return;
171
172 if (info_ptr->num_palette == 0 || info_ptr->num_palette
173 > PNG_MAX_PALETTE_LENGTH)
174 {
175 png_warning(png_ptr,
176 "Invalid palette size, hIST allocation skipped");
177
178 return;
179 }
180
181 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
182
183 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
184 * version 1.2.1
185 */
186 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
187 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
188
189 if (info_ptr->hist == NULL)
190 {
191 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
192 return;
193 }
194
195 info_ptr->free_me |= PNG_FREE_HIST;
196
197 for (i = 0; i < info_ptr->num_palette; i++)
198 info_ptr->hist[i] = hist[i];
199
200 info_ptr->valid |= PNG_INFO_hIST;
201 }
202 #endif
203
204 void PNGAPI
205 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
206 png_uint_32 width, png_uint_32 height, int bit_depth,
207 int color_type, int interlace_type, int compression_type,
208 int filter_type)
209 {
210 png_debug1(1, "in %s storage function", "IHDR");
211
212 if (png_ptr == NULL || info_ptr == NULL)
213 return;
214
215 info_ptr->width = width;
216 info_ptr->height = height;
217 info_ptr->bit_depth = (png_byte)bit_depth;
218 info_ptr->color_type = (png_byte)color_type;
219 info_ptr->compression_type = (png_byte)compression_type;
220 info_ptr->filter_type = (png_byte)filter_type;
221 info_ptr->interlace_type = (png_byte)interlace_type;
222
223 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
224 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
225 info_ptr->compression_type, info_ptr->filter_type);
226
227 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
228 info_ptr->channels = 1;
229
230 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
231 info_ptr->channels = 3;
232
233 else
234 info_ptr->channels = 1;
235
236 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
237 info_ptr->channels++;
238
239 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
240
241 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
242
243 #ifdef PNG_APNG_SUPPORTED
244 /* for non-animated png. this may be overwritten from an acTL chunk later */
245 info_ptr->num_frames = 1;
246 #endif
247 }
248
249 #ifdef PNG_oFFs_SUPPORTED
250 void PNGAPI
251 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
252 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
253 {
254 png_debug1(1, "in %s storage function", "oFFs");
255
256 if (png_ptr == NULL || info_ptr == NULL)
257 return;
258
259 info_ptr->x_offset = offset_x;
260 info_ptr->y_offset = offset_y;
261 info_ptr->offset_unit_type = (png_byte)unit_type;
262 info_ptr->valid |= PNG_INFO_oFFs;
263 }
264 #endif
265
266 #ifdef PNG_pCAL_SUPPORTED
267 void PNGAPI
268 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
269 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
270 int nparams, png_const_charp units, png_charpp params)
271 {
272 png_size_t length;
273 int i;
274
275 png_debug1(1, "in %s storage function", "pCAL");
276
277 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
278 || (nparams > 0 && params == NULL))
279 return;
280
281 length = strlen(purpose) + 1;
282 png_debug1(3, "allocating purpose for info (%lu bytes)",
283 (unsigned long)length);
284
285 /* TODO: validate format of calibration name and unit name */
286
287 /* Check that the type matches the specification. */
288 if (type < 0 || type > 3)
289 png_error(png_ptr, "Invalid pCAL equation type");
290
291 if (nparams < 0 || nparams > 255)
292 png_error(png_ptr, "Invalid pCAL parameter count");
293
294 /* Validate params[nparams] */
295 for (i=0; i<nparams; ++i)
296 if (params[i] == NULL ||
297 !png_check_fp_string(params[i], strlen(params[i])))
298 png_error(png_ptr, "Invalid format for pCAL parameter");
299
300 info_ptr->pcal_purpose = png_voidcast(png_charp,
301 png_malloc_warn(png_ptr, length));
302
303 if (info_ptr->pcal_purpose == NULL)
304 {
305 png_warning(png_ptr, "Insufficient memory for pCAL purpose");
306 return;
307 }
308
309 memcpy(info_ptr->pcal_purpose, purpose, length);
310
311 png_debug(3, "storing X0, X1, type, and nparams in info");
312 info_ptr->pcal_X0 = X0;
313 info_ptr->pcal_X1 = X1;
314 info_ptr->pcal_type = (png_byte)type;
315 info_ptr->pcal_nparams = (png_byte)nparams;
316
317 length = strlen(units) + 1;
318 png_debug1(3, "allocating units for info (%lu bytes)",
319 (unsigned long)length);
320
321 info_ptr->pcal_units = png_voidcast(png_charp,
322 png_malloc_warn(png_ptr, length));
323
324 if (info_ptr->pcal_units == NULL)
325 {
326 png_warning(png_ptr, "Insufficient memory for pCAL units");
327 return;
328 }
329
330 memcpy(info_ptr->pcal_units, units, length);
331
332 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
333 (png_size_t)((nparams + 1) * (sizeof (png_charp)))));
334
335 if (info_ptr->pcal_params == NULL)
336 {
337 png_warning(png_ptr, "Insufficient memory for pCAL params");
338 return;
339 }
340
341 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
342
343 for (i = 0; i < nparams; i++)
344 {
345 length = strlen(params[i]) + 1;
346 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
347 (unsigned long)length);
348
349 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
350
351 if (info_ptr->pcal_params[i] == NULL)
352 {
353 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
354 return;
355 }
356
357 memcpy(info_ptr->pcal_params[i], params[i], length);
358 }
359
360 info_ptr->valid |= PNG_INFO_pCAL;
361 info_ptr->free_me |= PNG_FREE_PCAL;
362 }
363 #endif
364
365 #ifdef PNG_sCAL_SUPPORTED
366 void PNGAPI
367 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
368 int unit, png_const_charp swidth, png_const_charp sheight)
369 {
370 png_size_t lengthw = 0, lengthh = 0;
371
372 png_debug1(1, "in %s storage function", "sCAL");
373
374 if (png_ptr == NULL || info_ptr == NULL)
375 return;
376
377 /* Double check the unit (should never get here with an invalid
378 * unit unless this is an API call.)
379 */
380 if (unit != 1 && unit != 2)
381 png_error(png_ptr, "Invalid sCAL unit");
382
383 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
384 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
385 png_error(png_ptr, "Invalid sCAL width");
386
387 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
388 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
389 png_error(png_ptr, "Invalid sCAL height");
390
391 info_ptr->scal_unit = (png_byte)unit;
392
393 ++lengthw;
394
395 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
396
397 info_ptr->scal_s_width = png_voidcast(png_charp,
398 png_malloc_warn(png_ptr, lengthw));
399
400 if (info_ptr->scal_s_width == NULL)
401 {
402 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
403 return;
404 }
405
406 memcpy(info_ptr->scal_s_width, swidth, lengthw);
407
408 ++lengthh;
409
410 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
411
412 info_ptr->scal_s_height = png_voidcast(png_charp,
413 png_malloc_warn(png_ptr, lengthh));
414
415 if (info_ptr->scal_s_height == NULL)
416 {
417 png_free (png_ptr, info_ptr->scal_s_width);
418 info_ptr->scal_s_width = NULL;
419
420 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
421 return;
422 }
423
424 memcpy(info_ptr->scal_s_height, sheight, lengthh);
425
426 info_ptr->valid |= PNG_INFO_sCAL;
427 info_ptr->free_me |= PNG_FREE_SCAL;
428 }
429
430 # ifdef PNG_FLOATING_POINT_SUPPORTED
431 void PNGAPI
432 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
433 double width, double height)
434 {
435 png_debug1(1, "in %s storage function", "sCAL");
436
437 /* Check the arguments. */
438 if (width <= 0)
439 png_warning(png_ptr, "Invalid sCAL width ignored");
440
441 else if (height <= 0)
442 png_warning(png_ptr, "Invalid sCAL height ignored");
443
444 else
445 {
446 /* Convert 'width' and 'height' to ASCII. */
447 char swidth[PNG_sCAL_MAX_DIGITS+1];
448 char sheight[PNG_sCAL_MAX_DIGITS+1];
449
450 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
451 PNG_sCAL_PRECISION);
452 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
453 PNG_sCAL_PRECISION);
454
455 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
456 }
457 }
458 # endif
459
460 # ifdef PNG_FIXED_POINT_SUPPORTED
461 void PNGAPI
462 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
463 png_fixed_point width, png_fixed_point height)
464 {
465 png_debug1(1, "in %s storage function", "sCAL");
466
467 /* Check the arguments. */
468 if (width <= 0)
469 png_warning(png_ptr, "Invalid sCAL width ignored");
470
471 else if (height <= 0)
472 png_warning(png_ptr, "Invalid sCAL height ignored");
473
474 else
475 {
476 /* Convert 'width' and 'height' to ASCII. */
477 char swidth[PNG_sCAL_MAX_DIGITS+1];
478 char sheight[PNG_sCAL_MAX_DIGITS+1];
479
480 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
481 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
482
483 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
484 }
485 }
486 # endif
487 #endif
488
489 #ifdef PNG_pHYs_SUPPORTED
490 void PNGAPI
491 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
492 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
493 {
494 png_debug1(1, "in %s storage function", "pHYs");
495
496 if (png_ptr == NULL || info_ptr == NULL)
497 return;
498
499 info_ptr->x_pixels_per_unit = res_x;
500 info_ptr->y_pixels_per_unit = res_y;
501 info_ptr->phys_unit_type = (png_byte)unit_type;
502 info_ptr->valid |= PNG_INFO_pHYs;
503 }
504 #endif
505
506 void PNGAPI
507 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
508 png_const_colorp palette, int num_palette)
509 {
510
511 png_debug1(1, "in %s storage function", "PLTE");
512
513 if (png_ptr == NULL || info_ptr == NULL)
514 return;
515
516 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
517 {
518 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
519 png_error(png_ptr, "Invalid palette length");
520
521 else
522 {
523 png_warning(png_ptr, "Invalid palette length");
524 return;
525 }
526 }
527
528 if ((num_palette > 0 && palette == NULL) ||
529 (num_palette == 0
530 # ifdef PNG_MNG_FEATURES_SUPPORTED
531 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
532 # endif
533 ))
534 {
535 png_error(png_ptr, "Invalid palette");
536 return;
537 }
538
539 /* It may not actually be necessary to set png_ptr->palette here;
540 * we do it for backward compatibility with the way the png_handle_tRNS
541 * function used to do the allocation.
542 *
543 * 1.6.0: the above statement appears to be incorrect; something has to set
544 * the palette inside png_struct on read.
545 */
546 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
547
548 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
549 * of num_palette entries, in case of an invalid PNG file that has
550 * too-large sample values.
551 */
552 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
553 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
554
555 if (num_palette > 0)
556 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
557 info_ptr->palette = png_ptr->palette;
558 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
559
560 info_ptr->free_me |= PNG_FREE_PLTE;
561
562 info_ptr->valid |= PNG_INFO_PLTE;
563 }
564
565 #ifdef PNG_sBIT_SUPPORTED
566 void PNGAPI
567 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
568 png_const_color_8p sig_bit)
569 {
570 png_debug1(1, "in %s storage function", "sBIT");
571
572 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
573 return;
574
575 info_ptr->sig_bit = *sig_bit;
576 info_ptr->valid |= PNG_INFO_sBIT;
577 }
578 #endif
579
580 #ifdef PNG_sRGB_SUPPORTED
581 void PNGAPI
582 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
583 {
584 png_debug1(1, "in %s storage function", "sRGB");
585
586 if (png_ptr == NULL || info_ptr == NULL)
587 return;
588
589 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
590 png_colorspace_sync_info(png_ptr, info_ptr);
591 }
592
593 void PNGAPI
594 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
595 int srgb_intent)
596 {
597 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
598
599 if (png_ptr == NULL || info_ptr == NULL)
600 return;
601
602 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent))
603 {
604 /* This causes the gAMA and cHRM to be written too */
605 info_ptr->colorspace.flags |=
606 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
607 }
608
609 png_colorspace_sync_info(png_ptr, info_ptr);
610 }
611 #endif /* sRGB */
612
613
614 #ifdef PNG_iCCP_SUPPORTED
615 void PNGAPI
616 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
617 png_const_charp name, int compression_type,
618 png_const_bytep profile, png_uint_32 proflen)
619 {
620 png_charp new_iccp_name;
621 png_bytep new_iccp_profile;
622 png_size_t length;
623
624 png_debug1(1, "in %s storage function", "iCCP");
625
626 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
627 return;
628
629 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
630 png_app_error(png_ptr, "Invalid iCCP compression method");
631
632 /* Set the colorspace first because this validates the profile; do not
633 * override previously set app cHRM or gAMA here (because likely as not the
634 * application knows better than libpng what the correct values are.) Pass
635 * the info_ptr color_type field to png_colorspace_set_ICC because in the
636 * write case it has not yet been stored in png_ptr.
637 */
638 {
639 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
640 proflen, profile, info_ptr->color_type);
641
642 png_colorspace_sync_info(png_ptr, info_ptr);
643
644 /* Don't do any of the copying if the profile was bad, or inconsistent. */
645 if (!result)
646 return;
647
648 /* But do write the gAMA and cHRM chunks from the profile. */
649 info_ptr->colorspace.flags |=
650 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
651 }
652
653 length = strlen(name)+1;
654 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
655
656 if (new_iccp_name == NULL)
657 {
658 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
659 return;
660 }
661
662 memcpy(new_iccp_name, name, length);
663 new_iccp_profile = png_voidcast(png_bytep,
664 png_malloc_warn(png_ptr, proflen));
665
666 if (new_iccp_profile == NULL)
667 {
668 png_free(png_ptr, new_iccp_name);
669 png_benign_error(png_ptr,
670 "Insufficient memory to process iCCP profile");
671 return;
672 }
673
674 memcpy(new_iccp_profile, profile, proflen);
675
676 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
677
678 info_ptr->iccp_proflen = proflen;
679 info_ptr->iccp_name = new_iccp_name;
680 info_ptr->iccp_profile = new_iccp_profile;
681 info_ptr->free_me |= PNG_FREE_ICCP;
682 info_ptr->valid |= PNG_INFO_iCCP;
683 }
684 #endif
685
686 #ifdef PNG_TEXT_SUPPORTED
687 void PNGAPI
688 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
689 png_const_textp text_ptr, int num_text)
690 {
691 int ret;
692 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
693
694 if (ret)
695 png_error(png_ptr, "Insufficient memory to store text");
696 }
697
698 int /* PRIVATE */
699 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
700 png_const_textp text_ptr, int num_text)
701 {
702 int i;
703
704 png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :
705 (unsigned long)png_ptr->chunk_name);
706
707 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
708 return(0);
709
710 /* Make sure we have enough space in the "text" array in info_struct
711 * to hold all of the incoming text_ptr objects. This compare can't overflow
712 * because max_text >= num_text (anyway, subtract of two positive integers
713 * can't overflow in any case.)
714 */
715 if (num_text > info_ptr->max_text - info_ptr->num_text)
716 {
717 int old_num_text = info_ptr->num_text;
718 int max_text;
719 png_textp new_text = NULL;
720
721 /* Calculate an appropriate max_text, checking for overflow. */
722 max_text = old_num_text;
723 if (num_text <= INT_MAX - max_text)
724 {
725 max_text += num_text;
726
727 /* Round up to a multiple of 8 */
728 if (max_text < INT_MAX-8)
729 max_text = (max_text + 8) & ~0x7;
730
731 else
732 max_text = INT_MAX;
733
734 /* Now allocate a new array and copy the old members in, this does all
735 * the overflow checks.
736 */
737 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
738 info_ptr->text, old_num_text, max_text-old_num_text,
739 sizeof *new_text));
740 }
741
742 if (new_text == NULL)
743 {
744 png_chunk_report(png_ptr, "too many text chunks",
745 PNG_CHUNK_WRITE_ERROR);
746 return 1;
747 }
748
749 png_free(png_ptr, info_ptr->text);
750
751 info_ptr->text = new_text;
752 info_ptr->free_me |= PNG_FREE_TEXT;
753 info_ptr->max_text = max_text;
754 /* num_text is adjusted below as the entries are copied in */
755
756 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
757 }
758
759 for (i = 0; i < num_text; i++)
760 {
761 size_t text_length, key_len;
762 size_t lang_len, lang_key_len;
763 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
764
765 if (text_ptr[i].key == NULL)
766 continue;
767
768 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
769 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
770 {
771 png_chunk_report(png_ptr, "text compression mode is out of range",
772 PNG_CHUNK_WRITE_ERROR);
773 continue;
774 }
775
776 key_len = strlen(text_ptr[i].key);
777
778 if (text_ptr[i].compression <= 0)
779 {
780 lang_len = 0;
781 lang_key_len = 0;
782 }
783
784 else
785 # ifdef PNG_iTXt_SUPPORTED
786 {
787 /* Set iTXt data */
788
789 if (text_ptr[i].lang != NULL)
790 lang_len = strlen(text_ptr[i].lang);
791
792 else
793 lang_len = 0;
794
795 if (text_ptr[i].lang_key != NULL)
796 lang_key_len = strlen(text_ptr[i].lang_key);
797
798 else
799 lang_key_len = 0;
800 }
801 # else /* PNG_iTXt_SUPPORTED */
802 {
803 png_chunk_report(png_ptr, "iTXt chunk not supported",
804 PNG_CHUNK_WRITE_ERROR);
805 continue;
806 }
807 # endif
808
809 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
810 {
811 text_length = 0;
812 # ifdef PNG_iTXt_SUPPORTED
813 if (text_ptr[i].compression > 0)
814 textp->compression = PNG_ITXT_COMPRESSION_NONE;
815
816 else
817 # endif
818 textp->compression = PNG_TEXT_COMPRESSION_NONE;
819 }
820
821 else
822 {
823 text_length = strlen(text_ptr[i].text);
824 textp->compression = text_ptr[i].compression;
825 }
826
827 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
828 key_len + text_length + lang_len + lang_key_len + 4));
829
830 if (textp->key == NULL)
831 {
832 png_chunk_report(png_ptr, "text chunk: out of memory",
833 PNG_CHUNK_WRITE_ERROR);
834 return 1;
835 }
836
837 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
838 (unsigned long)(png_uint_32)
839 (key_len + lang_len + lang_key_len + text_length + 4),
840 textp->key);
841
842 memcpy(textp->key, text_ptr[i].key, key_len);
843 *(textp->key + key_len) = '\0';
844
845 if (text_ptr[i].compression > 0)
846 {
847 textp->lang = textp->key + key_len + 1;
848 memcpy(textp->lang, text_ptr[i].lang, lang_len);
849 *(textp->lang + lang_len) = '\0';
850 textp->lang_key = textp->lang + lang_len + 1;
851 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
852 *(textp->lang_key + lang_key_len) = '\0';
853 textp->text = textp->lang_key + lang_key_len + 1;
854 }
855
856 else
857 {
858 textp->lang=NULL;
859 textp->lang_key=NULL;
860 textp->text = textp->key + key_len + 1;
861 }
862
863 if (text_length)
864 memcpy(textp->text, text_ptr[i].text, text_length);
865
866 *(textp->text + text_length) = '\0';
867
868 # ifdef PNG_iTXt_SUPPORTED
869 if (textp->compression > 0)
870 {
871 textp->text_length = 0;
872 textp->itxt_length = text_length;
873 }
874
875 else
876 # endif
877 {
878 textp->text_length = text_length;
879 textp->itxt_length = 0;
880 }
881
882 info_ptr->num_text++;
883 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
884 }
885
886 return(0);
887 }
888 #endif
889
890 #ifdef PNG_tIME_SUPPORTED
891 void PNGAPI
892 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
893 png_const_timep mod_time)
894 {
895 png_debug1(1, "in %s storage function", "tIME");
896
897 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
898 (png_ptr->mode & PNG_WROTE_tIME))
899 return;
900
901 if (mod_time->month == 0 || mod_time->month > 12 ||
902 mod_time->day == 0 || mod_time->day > 31 ||
903 mod_time->hour > 23 || mod_time->minute > 59 ||
904 mod_time->second > 60)
905 {
906 png_warning(png_ptr, "Ignoring invalid time value");
907 return;
908 }
909
910 info_ptr->mod_time = *mod_time;
911 info_ptr->valid |= PNG_INFO_tIME;
912 }
913 #endif
914
915 #ifdef PNG_tRNS_SUPPORTED
916 void PNGAPI
917 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
918 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
919 {
920 png_debug1(1, "in %s storage function", "tRNS");
921
922 if (png_ptr == NULL || info_ptr == NULL)
923 return;
924
925 if (trans_alpha != NULL)
926 {
927 /* It may not actually be necessary to set png_ptr->trans_alpha here;
928 * we do it for backward compatibility with the way the png_handle_tRNS
929 * function used to do the allocation.
930 *
931 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
932 * relies on png_set_tRNS storing the information in png_struct
933 * (otherwise it won't be there for the code in pngrtran.c).
934 */
935
936 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
937
938 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
939 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
940 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
941
942 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
943 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
944 }
945
946 if (trans_color != NULL)
947 {
948 int sample_max = (1 << info_ptr->bit_depth);
949
950 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
951 trans_color->gray > sample_max) ||
952 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
953 (trans_color->red > sample_max ||
954 trans_color->green > sample_max ||
955 trans_color->blue > sample_max)))
956 png_warning(png_ptr,
957 "tRNS chunk has out-of-range samples for bit_depth");
958
959 info_ptr->trans_color = *trans_color;
960
961 if (num_trans == 0)
962 num_trans = 1;
963 }
964
965 info_ptr->num_trans = (png_uint_16)num_trans;
966
967 if (num_trans != 0)
968 {
969 info_ptr->valid |= PNG_INFO_tRNS;
970 info_ptr->free_me |= PNG_FREE_TRNS;
971 }
972 }
973 #endif
974
975 #ifdef PNG_sPLT_SUPPORTED
976 void PNGAPI
977 png_set_sPLT(png_const_structrp png_ptr,
978 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
979 /*
980 * entries - array of png_sPLT_t structures
981 * to be added to the list of palettes
982 * in the info structure.
983 *
984 * nentries - number of palette structures to be
985 * added.
986 */
987 {
988 png_sPLT_tp np;
989
990 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
991 return;
992
993 /* Use the internal realloc function, which checks for all the possible
994 * overflows. Notice that the parameters are (int) and (size_t)
995 */
996 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
997 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
998 sizeof *np));
999
1000 if (np == NULL)
1001 {
1002 /* Out of memory or too many chunks */
1003 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1004 return;
1005 }
1006
1007 png_free(png_ptr, info_ptr->splt_palettes);
1008 info_ptr->splt_palettes = np;
1009 info_ptr->free_me |= PNG_FREE_SPLT;
1010
1011 np += info_ptr->splt_palettes_num;
1012
1013 do
1014 {
1015 png_size_t length;
1016
1017 /* Skip invalid input entries */
1018 if (entries->name == NULL || entries->entries == NULL)
1019 {
1020 /* png_handle_sPLT doesn't do this, so this is an app error */
1021 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1022 /* Just skip the invalid entry */
1023 continue;
1024 }
1025
1026 np->depth = entries->depth;
1027
1028 /* In the even of out-of-memory just return - there's no point keeping on
1029 * trying to add sPLT chunks.
1030 */
1031 length = strlen(entries->name) + 1;
1032 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1033
1034 if (np->name == NULL)
1035 break;
1036
1037 memcpy(np->name, entries->name, length);
1038
1039 /* IMPORTANT: we have memory now that won't get freed if something else
1040 * goes wrong, this code must free it. png_malloc_array produces no
1041 * warnings, use a png_chunk_report (below) if there is an error.
1042 */
1043 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1044 entries->nentries, sizeof (png_sPLT_entry)));
1045
1046 if (np->entries == NULL)
1047 {
1048 png_free(png_ptr, np->name);
1049 break;
1050 }
1051
1052 np->nentries = entries->nentries;
1053 /* This multiply can't overflow because png_malloc_array has already
1054 * checked it when doing the allocation.
1055 */
1056 memcpy(np->entries, entries->entries,
1057 entries->nentries * sizeof (png_sPLT_entry));
1058
1059 /* Note that 'continue' skips the advance of the out pointer and out
1060 * count, so an invalid entry is not added.
1061 */
1062 info_ptr->valid |= PNG_INFO_sPLT;
1063 ++(info_ptr->splt_palettes_num);
1064 ++np;
1065 }
1066 while (++entries, --nentries);
1067
1068 if (nentries > 0)
1069 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1070 }
1071 #endif /* PNG_sPLT_SUPPORTED */
1072
1073 #ifdef PNG_APNG_SUPPORTED
1074 png_uint_32 PNGAPI
1075 png_set_acTL(png_structp png_ptr, png_infop info_ptr,
1076 png_uint_32 num_frames, png_uint_32 num_plays)
1077 {
1078 png_debug1(1, "in %s storage function", "acTL");
1079
1080 if (png_ptr == NULL || info_ptr == NULL)
1081 {
1082 png_warning(png_ptr,
1083 "Call to png_set_acTL() with NULL png_ptr "
1084 "or info_ptr ignored");
1085 return (0);
1086 }
1087 if (num_frames == 0)
1088 {
1089 png_warning(png_ptr,
1090 "Ignoring attempt to set acTL with num_frames zero");
1091 return (0);
1092 }
1093 if (num_frames > PNG_UINT_31_MAX)
1094 {
1095 png_warning(png_ptr,
1096 "Ignoring attempt to set acTL with num_frames > 2^31-1");
1097 return (0);
1098 }
1099 if (num_plays > PNG_UINT_31_MAX)
1100 {
1101 png_warning(png_ptr,
1102 "Ignoring attempt to set acTL with num_plays "
1103 "> 2^31-1");
1104 return (0);
1105 }
1106
1107 info_ptr->num_frames = num_frames;
1108 info_ptr->num_plays = num_plays;
1109
1110 info_ptr->valid |= PNG_INFO_acTL;
1111
1112 return (1);
1113 }
1114
1115 /* delay_num and delay_den can hold any 16-bit values including zero */
1116 png_uint_32 PNGAPI
1117 png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
1118 png_uint_32 width, png_uint_32 height,
1119 png_uint_32 x_offset, png_uint_32 y_offset,
1120 png_uint_16 delay_num, png_uint_16 delay_den,
1121 png_byte dispose_op, png_byte blend_op)
1122 {
1123 png_debug1(1, "in %s storage function", "fcTL");
1124
1125 if (png_ptr == NULL || info_ptr == NULL)
1126 {
1127 png_warning(png_ptr,
1128 "Call to png_set_fcTL() with NULL png_ptr or info_ptr "
1129 "ignored");
1130 return (0);
1131 }
1132
1133 png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
1134 delay_num, delay_den, dispose_op, blend_op);
1135
1136 if (blend_op == PNG_BLEND_OP_OVER)
1137 {
1138 if (!(png_ptr->color_type & PNG_COLOR_MASK_ALPHA) &&
1139 !(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
1140 {
1141 png_warning(png_ptr, "PNG_BLEND_OP_OVER is meaningless "
1142 "and wasteful for opaque images, ignored");
1143 blend_op = PNG_BLEND_OP_SOURCE;
1144 }
1145 }
1146
1147 info_ptr->next_frame_width = width;
1148 info_ptr->next_frame_height = height;
1149 info_ptr->next_frame_x_offset = x_offset;
1150 info_ptr->next_frame_y_offset = y_offset;
1151 info_ptr->next_frame_delay_num = delay_num;
1152 info_ptr->next_frame_delay_den = delay_den;
1153 info_ptr->next_frame_dispose_op = dispose_op;
1154 info_ptr->next_frame_blend_op = blend_op;
1155
1156 info_ptr->valid |= PNG_INFO_fcTL;
1157
1158 return (1);
1159 }
1160
1161 void /* PRIVATE */
1162 png_ensure_fcTL_is_valid(png_structp png_ptr,
1163 png_uint_32 width, png_uint_32 height,
1164 png_uint_32 x_offset, png_uint_32 y_offset,
1165 png_uint_16 delay_num, png_uint_16 delay_den,
1166 png_byte dispose_op, png_byte blend_op)
1167 {
1168 if (width > PNG_UINT_31_MAX)
1169 png_error(png_ptr, "invalid width in fcTL (> 2^31-1)");
1170 if (height > PNG_UINT_31_MAX)
1171 png_error(png_ptr, "invalid height in fcTL (> 2^31-1)");
1172 if (x_offset > PNG_UINT_31_MAX)
1173 png_error(png_ptr, "invalid x_offset in fcTL (> 2^31-1)");
1174 if (y_offset > PNG_UINT_31_MAX)
1175 png_error(png_ptr, "invalid y_offset in fcTL (> 2^31-1)");
1176 if (width + x_offset > png_ptr->first_frame_width ||
1177 height + y_offset > png_ptr->first_frame_height)
1178 png_error(png_ptr, "dimensions of a frame are greater than"
1179 "the ones in IHDR");
1180
1181 if (dispose_op != PNG_DISPOSE_OP_NONE &&
1182 dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
1183 dispose_op != PNG_DISPOSE_OP_PREVIOUS)
1184 png_error(png_ptr, "invalid dispose_op in fcTL");
1185
1186 if (blend_op != PNG_BLEND_OP_SOURCE &&
1187 blend_op != PNG_BLEND_OP_OVER)
1188 png_error(png_ptr, "invalid blend_op in fcTL");
1189
1190 PNG_UNUSED(delay_num)
1191 PNG_UNUSED(delay_den)
1192 }
1193
1194 png_uint_32 PNGAPI
1195 png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
1196 png_byte is_hidden)
1197 {
1198 png_debug(1, "in png_first_frame_is_hidden()");
1199
1200 if (png_ptr == NULL)
1201 return 0;
1202
1203 if (is_hidden)
1204 png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
1205 else
1206 png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
1207
1208 PNG_UNUSED(info_ptr)
1209
1210 return 1;
1211 }
1212 #endif /* PNG_APNG_SUPPORTED */
1213
1214 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1215 static png_byte
1216 check_location(png_const_structrp png_ptr, int location)
1217 {
1218 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1219
1220 /* New in 1.6.0; copy the location and check it. This is an API
1221 * change, previously the app had to use the
1222 * png_set_unknown_chunk_location API below for each chunk.
1223 */
1224 if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT))
1225 {
1226 /* Write struct, so unknown chunks come from the app */
1227 png_app_warning(png_ptr,
1228 "png_set_unknown_chunks now expects a valid location");
1229 /* Use the old behavior */
1230 location = (png_byte)(png_ptr->mode &
1231 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1232 }
1233
1234 /* This need not be an internal error - if the app calls
1235 * png_set_unknown_chunks on a read pointer it must get the location right.
1236 */
1237 if (location == 0)
1238 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1239
1240 /* Now reduce the location to the top-most set bit by removing each least
1241 * significant bit in turn.
1242 */
1243 while (location != (location & -location))
1244 location &= ~(location & -location);
1245
1246 /* The cast is safe because 'location' is a bit mask and only the low four
1247 * bits are significant.
1248 */
1249 return (png_byte)location;
1250 }
1251
1252 void PNGAPI
1253 png_set_unknown_chunks(png_const_structrp png_ptr,
1254 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1255 {
1256 png_unknown_chunkp np;
1257
1258 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1259 unknowns == NULL)
1260 return;
1261
1262 /* Check for the failure cases where support has been disabled at compile
1263 * time. This code is hardly ever compiled - it's here because
1264 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1265 * code) but may be meaningless if the read or write handling of unknown
1266 * chunks is not compiled in.
1267 */
1268 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1269 defined(PNG_READ_SUPPORTED)
1270 if (png_ptr->mode & PNG_IS_READ_STRUCT)
1271 {
1272 png_app_error(png_ptr, "no unknown chunk support on read");
1273 return;
1274 }
1275 # endif
1276 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1277 defined(PNG_WRITE_SUPPORTED)
1278 if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
1279 {
1280 png_app_error(png_ptr, "no unknown chunk support on write");
1281 return;
1282 }
1283 # endif
1284
1285 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1286 * unknown critical chunks could be lost with just a warning resulting in
1287 * undefined behavior. Now png_chunk_report is used to provide behavior
1288 * appropriate to read or write.
1289 */
1290 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1291 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1292 sizeof *np));
1293
1294 if (np == NULL)
1295 {
1296 png_chunk_report(png_ptr, "too many unknown chunks",
1297 PNG_CHUNK_WRITE_ERROR);
1298 return;
1299 }
1300
1301 png_free(png_ptr, info_ptr->unknown_chunks);
1302 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1303 info_ptr->free_me |= PNG_FREE_UNKN;
1304
1305 np += info_ptr->unknown_chunks_num;
1306
1307 /* Increment unknown_chunks_num each time round the loop to protect the
1308 * just-allocated chunk data.
1309 */
1310 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1311 {
1312 memcpy(np->name, unknowns->name, (sizeof np->name));
1313 np->name[(sizeof np->name)-1] = '\0';
1314 np->location = check_location(png_ptr, unknowns->location);
1315
1316 if (unknowns->size == 0)
1317 {
1318 np->data = NULL;
1319 np->size = 0;
1320 }
1321
1322 else
1323 {
1324 np->data = png_voidcast(png_bytep,
1325 png_malloc_base(png_ptr, unknowns->size));
1326
1327 if (np->data == NULL)
1328 {
1329 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1330 PNG_CHUNK_WRITE_ERROR);
1331 /* But just skip storing the unknown chunk */
1332 continue;
1333 }
1334
1335 memcpy(np->data, unknowns->data, unknowns->size);
1336 np->size = unknowns->size;
1337 }
1338
1339 /* These increments are skipped on out-of-memory for the data - the
1340 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1341 * This is correct in the read case (the chunk is just dropped.)
1342 */
1343 ++np;
1344 ++(info_ptr->unknown_chunks_num);
1345 }
1346 }
1347
1348 void PNGAPI
1349 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1350 int chunk, int location)
1351 {
1352 /* This API is pretty pointless in 1.6.0 because the location can be set
1353 * before the call to png_set_unknown_chunks.
1354 *
1355 * TODO: add a png_app_warning in 1.7
1356 */
1357 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1358 chunk < info_ptr->unknown_chunks_num)
1359 {
1360 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1361 {
1362 png_app_error(png_ptr, "invalid unknown chunk location");
1363 /* Fake out the pre 1.6.0 behavior: */
1364 if ((location & PNG_HAVE_IDAT)) /* undocumented! */
1365 location = PNG_AFTER_IDAT;
1366
1367 else
1368 location = PNG_HAVE_IHDR; /* also undocumented */
1369 }
1370
1371 info_ptr->unknown_chunks[chunk].location =
1372 check_location(png_ptr, location);
1373 }
1374 }
1375 #endif
1376
1377
1378 #ifdef PNG_MNG_FEATURES_SUPPORTED
1379 png_uint_32 PNGAPI
1380 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1381 {
1382 png_debug(1, "in png_permit_mng_features");
1383
1384 if (png_ptr == NULL)
1385 return 0;
1386
1387 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1388
1389 return png_ptr->mng_features_permitted;
1390 }
1391 #endif
1392
1393 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1394 static unsigned int
1395 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1396 {
1397 unsigned int i;
1398
1399 /* Utility function: update the 'keep' state of a chunk if it is already in
1400 * the list, otherwise add it to the list.
1401 */
1402 for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0)
1403 {
1404 list[4] = (png_byte)keep;
1405 return count;
1406 }
1407
1408 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1409 {
1410 ++count;
1411 memcpy(list, add, 4);
1412 list[4] = (png_byte)keep;
1413 }
1414
1415 return count;
1416 }
1417
1418 void PNGAPI
1419 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1420 png_const_bytep chunk_list, int num_chunks_in)
1421 {
1422 png_bytep new_list;
1423 unsigned int num_chunks, old_num_chunks;
1424
1425 if (png_ptr == NULL)
1426 return;
1427
1428 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1429 {
1430 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1431 return;
1432 }
1433
1434 if (num_chunks_in <= 0)
1435 {
1436 png_ptr->unknown_default = keep;
1437
1438 /* '0' means just set the flags, so stop here */
1439 if (num_chunks_in == 0)
1440 return;
1441 }
1442
1443 if (num_chunks_in < 0)
1444 {
1445 /* Ignore all unknown chunks and all chunks recognized by
1446 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1447 */
1448 static PNG_CONST png_byte chunks_to_ignore[] = {
1449 98, 75, 71, 68, '\0', /* bKGD */
1450 99, 72, 82, 77, '\0', /* cHRM */
1451 103, 65, 77, 65, '\0', /* gAMA */
1452 104, 73, 83, 84, '\0', /* hIST */
1453 105, 67, 67, 80, '\0', /* iCCP */
1454 105, 84, 88, 116, '\0', /* iTXt */
1455 111, 70, 70, 115, '\0', /* oFFs */
1456 112, 67, 65, 76, '\0', /* pCAL */
1457 112, 72, 89, 115, '\0', /* pHYs */
1458 115, 66, 73, 84, '\0', /* sBIT */
1459 115, 67, 65, 76, '\0', /* sCAL */
1460 115, 80, 76, 84, '\0', /* sPLT */
1461 115, 84, 69, 82, '\0', /* sTER */
1462 115, 82, 71, 66, '\0', /* sRGB */
1463 116, 69, 88, 116, '\0', /* tEXt */
1464 116, 73, 77, 69, '\0', /* tIME */
1465 122, 84, 88, 116, '\0' /* zTXt */
1466 };
1467
1468 chunk_list = chunks_to_ignore;
1469 num_chunks = (sizeof chunks_to_ignore)/5;
1470 }
1471
1472 else /* num_chunks_in > 0 */
1473 {
1474 if (chunk_list == NULL)
1475 {
1476 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1477 * which can be switched off.
1478 */
1479 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1480 return;
1481 }
1482
1483 num_chunks = num_chunks_in;
1484 }
1485
1486 old_num_chunks = png_ptr->num_chunk_list;
1487 if (png_ptr->chunk_list == NULL)
1488 old_num_chunks = 0;
1489
1490 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1491 */
1492 if (num_chunks + old_num_chunks > UINT_MAX/5)
1493 {
1494 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1495 return;
1496 }
1497
1498 /* If these chunks are being reset to the default then no more memory is
1499 * required because add_one_chunk above doesn't extend the list if the 'keep'
1500 * parameter is the default.
1501 */
1502 if (keep)
1503 {
1504 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1505 5 * (num_chunks + old_num_chunks)));
1506
1507 if (old_num_chunks > 0)
1508 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1509 }
1510
1511 else if (old_num_chunks > 0)
1512 new_list = png_ptr->chunk_list;
1513
1514 else
1515 new_list = NULL;
1516
1517 /* Add the new chunks together with each one's handling code. If the chunk
1518 * already exists the code is updated, otherwise the chunk is added to the
1519 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1520 * the earlier convention that the last setting is the one that is used.)
1521 */
1522 if (new_list != NULL)
1523 {
1524 png_const_bytep inlist;
1525 png_bytep outlist;
1526 unsigned int i;
1527
1528 for (i=0; i<num_chunks; ++i)
1529 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1530 chunk_list+5*i, keep);
1531
1532 /* Now remove any spurious 'default' entries. */
1533 num_chunks = 0;
1534 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1535 if (inlist[4])
1536 {
1537 if (outlist != inlist)
1538 memcpy(outlist, inlist, 5);
1539 outlist += 5;
1540 ++num_chunks;
1541 }
1542
1543 /* This means the application has removed all the specialized handling. */
1544 if (num_chunks == 0)
1545 {
1546 if (png_ptr->chunk_list != new_list)
1547 png_free(png_ptr, new_list);
1548
1549 new_list = NULL;
1550 }
1551 }
1552
1553 else
1554 num_chunks = 0;
1555
1556 png_ptr->num_chunk_list = num_chunks;
1557
1558 if (png_ptr->chunk_list != new_list)
1559 {
1560 if (png_ptr->chunk_list != NULL)
1561 png_free(png_ptr, png_ptr->chunk_list);
1562
1563 png_ptr->chunk_list = new_list;
1564 }
1565 }
1566 #endif
1567
1568 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1569 void PNGAPI
1570 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1571 png_user_chunk_ptr read_user_chunk_fn)
1572 {
1573 png_debug(1, "in png_set_read_user_chunk_fn");
1574
1575 if (png_ptr == NULL)
1576 return;
1577
1578 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1579 png_ptr->user_chunk_ptr = user_chunk_ptr;
1580 }
1581 #endif
1582
1583 #ifdef PNG_INFO_IMAGE_SUPPORTED
1584 void PNGAPI
1585 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1586 png_bytepp row_pointers)
1587 {
1588 png_debug1(1, "in %s storage function", "rows");
1589
1590 if (png_ptr == NULL || info_ptr == NULL)
1591 return;
1592
1593 if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1594 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1595
1596 info_ptr->row_pointers = row_pointers;
1597
1598 if (row_pointers)
1599 info_ptr->valid |= PNG_INFO_IDAT;
1600 }
1601 #endif
1602
1603 void PNGAPI
1604 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
1605 {
1606 if (png_ptr == NULL)
1607 return;
1608
1609 if (size == 0 || size > PNG_UINT_31_MAX)
1610 png_error(png_ptr, "invalid compression buffer size");
1611
1612 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1613 if (png_ptr->mode & PNG_IS_READ_STRUCT)
1614 {
1615 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1616 return;
1617 }
1618 # endif
1619
1620 # ifdef PNG_WRITE_SUPPORTED
1621 if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
1622 {
1623 if (png_ptr->zowner != 0)
1624 {
1625 png_warning(png_ptr,
1626 "Compression buffer size cannot be changed because it is in use");
1627 return;
1628 }
1629
1630 if (size > ZLIB_IO_MAX)
1631 {
1632 png_warning(png_ptr,
1633 "Compression buffer size limited to system maximum");
1634 size = ZLIB_IO_MAX; /* must fit */
1635 }
1636
1637 else if (size < 6)
1638 {
1639 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1640 * if this is permitted.
1641 */
1642 png_warning(png_ptr,
1643 "Compression buffer size cannot be reduced below 6");
1644 return;
1645 }
1646
1647 if (png_ptr->zbuffer_size != size)
1648 {
1649 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1650 png_ptr->zbuffer_size = (uInt)size;
1651 }
1652 }
1653 # endif
1654 }
1655
1656 void PNGAPI
1657 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1658 {
1659 if (png_ptr && info_ptr)
1660 info_ptr->valid &= ~mask;
1661 }
1662
1663
1664 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1665 /* This function was added to libpng 1.2.6 */
1666 void PNGAPI
1667 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1668 png_uint_32 user_height_max)
1669 {
1670 /* Images with dimensions larger than these limits will be
1671 * rejected by png_set_IHDR(). To accept any PNG datastream
1672 * regardless of dimensions, set both limits to 0x7ffffffL.
1673 */
1674 if (png_ptr == NULL)
1675 return;
1676
1677 png_ptr->user_width_max = user_width_max;
1678 png_ptr->user_height_max = user_height_max;
1679 }
1680
1681 /* This function was added to libpng 1.4.0 */
1682 void PNGAPI
1683 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1684 {
1685 if (png_ptr)
1686 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1687 }
1688
1689 /* This function was added to libpng 1.4.1 */
1690 void PNGAPI
1691 png_set_chunk_malloc_max (png_structrp png_ptr,
1692 png_alloc_size_t user_chunk_malloc_max)
1693 {
1694 if (png_ptr)
1695 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1696 }
1697 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1698
1699
1700 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1701 void PNGAPI
1702 png_set_benign_errors(png_structrp png_ptr, int allowed)
1703 {
1704 png_debug(1, "in png_set_benign_errors");
1705
1706 /* If allowed is 1, png_benign_error() is treated as a warning.
1707 *
1708 * If allowed is 0, png_benign_error() is treated as an error (which
1709 * is the default behavior if png_set_benign_errors() is not called).
1710 */
1711
1712 if (allowed)
1713 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1714 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1715
1716 else
1717 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1718 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1719 }
1720 #endif /* PNG_BENIGN_ERRORS_SUPPORTED */
1721
1722 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1723 /* Whether to report invalid palette index; added at libng-1.5.10.
1724 * It is possible for an indexed (color-type==3) PNG file to contain
1725 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1726 * fewer entries than the image's bit-depth would allow. We recover
1727 * from this gracefully by filling any incomplete palette with zeroes
1728 * (opaque black). By default, when this occurs libpng will issue
1729 * a benign error. This API can be used to override that behavior.
1730 */
1731 void PNGAPI
1732 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1733 {
1734 png_debug(1, "in png_set_check_for_invalid_index");
1735
1736 if (allowed > 0)
1737 png_ptr->num_palette_max = 0;
1738
1739 else
1740 png_ptr->num_palette_max = -1;
1741 }
1742 #endif
1743 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

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