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comparison lib/libpng/pngset.c @ 2296:6e178010fc29

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libpng
author Ritor1
date Mon, 17 Mar 2014 01:21:55 +0600
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2295:6fd03869f65c 2296:6e178010fc29
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
244 #ifdef PNG_oFFs_SUPPORTED
245 void PNGAPI
246 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
247 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
248 {
249 png_debug1(1, "in %s storage function", "oFFs");
250
251 if (png_ptr == NULL || info_ptr == NULL)
252 return;
253
254 info_ptr->x_offset = offset_x;
255 info_ptr->y_offset = offset_y;
256 info_ptr->offset_unit_type = (png_byte)unit_type;
257 info_ptr->valid |= PNG_INFO_oFFs;
258 }
259 #endif
260
261 #ifdef PNG_pCAL_SUPPORTED
262 void PNGAPI
263 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
264 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
265 int nparams, png_const_charp units, png_charpp params)
266 {
267 png_size_t length;
268 int i;
269
270 png_debug1(1, "in %s storage function", "pCAL");
271
272 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
273 || (nparams > 0 && params == NULL))
274 return;
275
276 length = strlen(purpose) + 1;
277 png_debug1(3, "allocating purpose for info (%lu bytes)",
278 (unsigned long)length);
279
280 /* TODO: validate format of calibration name and unit name */
281
282 /* Check that the type matches the specification. */
283 if (type < 0 || type > 3)
284 png_error(png_ptr, "Invalid pCAL equation type");
285
286 if (nparams < 0 || nparams > 255)
287 png_error(png_ptr, "Invalid pCAL parameter count");
288
289 /* Validate params[nparams] */
290 for (i=0; i<nparams; ++i)
291 if (params[i] == NULL ||
292 !png_check_fp_string(params[i], strlen(params[i])))
293 png_error(png_ptr, "Invalid format for pCAL parameter");
294
295 info_ptr->pcal_purpose = png_voidcast(png_charp,
296 png_malloc_warn(png_ptr, length));
297
298 if (info_ptr->pcal_purpose == NULL)
299 {
300 png_warning(png_ptr, "Insufficient memory for pCAL purpose");
301 return;
302 }
303
304 memcpy(info_ptr->pcal_purpose, purpose, length);
305
306 png_debug(3, "storing X0, X1, type, and nparams in info");
307 info_ptr->pcal_X0 = X0;
308 info_ptr->pcal_X1 = X1;
309 info_ptr->pcal_type = (png_byte)type;
310 info_ptr->pcal_nparams = (png_byte)nparams;
311
312 length = strlen(units) + 1;
313 png_debug1(3, "allocating units for info (%lu bytes)",
314 (unsigned long)length);
315
316 info_ptr->pcal_units = png_voidcast(png_charp,
317 png_malloc_warn(png_ptr, length));
318
319 if (info_ptr->pcal_units == NULL)
320 {
321 png_warning(png_ptr, "Insufficient memory for pCAL units");
322 return;
323 }
324
325 memcpy(info_ptr->pcal_units, units, length);
326
327 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
328 (png_size_t)((nparams + 1) * (sizeof (png_charp)))));
329
330 if (info_ptr->pcal_params == NULL)
331 {
332 png_warning(png_ptr, "Insufficient memory for pCAL params");
333 return;
334 }
335
336 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
337
338 for (i = 0; i < nparams; i++)
339 {
340 length = strlen(params[i]) + 1;
341 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
342 (unsigned long)length);
343
344 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
345
346 if (info_ptr->pcal_params[i] == NULL)
347 {
348 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
349 return;
350 }
351
352 memcpy(info_ptr->pcal_params[i], params[i], length);
353 }
354
355 info_ptr->valid |= PNG_INFO_pCAL;
356 info_ptr->free_me |= PNG_FREE_PCAL;
357 }
358 #endif
359
360 #ifdef PNG_sCAL_SUPPORTED
361 void PNGAPI
362 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
363 int unit, png_const_charp swidth, png_const_charp sheight)
364 {
365 png_size_t lengthw = 0, lengthh = 0;
366
367 png_debug1(1, "in %s storage function", "sCAL");
368
369 if (png_ptr == NULL || info_ptr == NULL)
370 return;
371
372 /* Double check the unit (should never get here with an invalid
373 * unit unless this is an API call.)
374 */
375 if (unit != 1 && unit != 2)
376 png_error(png_ptr, "Invalid sCAL unit");
377
378 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
379 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
380 png_error(png_ptr, "Invalid sCAL width");
381
382 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
383 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
384 png_error(png_ptr, "Invalid sCAL height");
385
386 info_ptr->scal_unit = (png_byte)unit;
387
388 ++lengthw;
389
390 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
391
392 info_ptr->scal_s_width = png_voidcast(png_charp,
393 png_malloc_warn(png_ptr, lengthw));
394
395 if (info_ptr->scal_s_width == NULL)
396 {
397 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
398 return;
399 }
400
401 memcpy(info_ptr->scal_s_width, swidth, lengthw);
402
403 ++lengthh;
404
405 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
406
407 info_ptr->scal_s_height = png_voidcast(png_charp,
408 png_malloc_warn(png_ptr, lengthh));
409
410 if (info_ptr->scal_s_height == NULL)
411 {
412 png_free (png_ptr, info_ptr->scal_s_width);
413 info_ptr->scal_s_width = NULL;
414
415 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
416 return;
417 }
418
419 memcpy(info_ptr->scal_s_height, sheight, lengthh);
420
421 info_ptr->valid |= PNG_INFO_sCAL;
422 info_ptr->free_me |= PNG_FREE_SCAL;
423 }
424
425 # ifdef PNG_FLOATING_POINT_SUPPORTED
426 void PNGAPI
427 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
428 double width, double height)
429 {
430 png_debug1(1, "in %s storage function", "sCAL");
431
432 /* Check the arguments. */
433 if (width <= 0)
434 png_warning(png_ptr, "Invalid sCAL width ignored");
435
436 else if (height <= 0)
437 png_warning(png_ptr, "Invalid sCAL height ignored");
438
439 else
440 {
441 /* Convert 'width' and 'height' to ASCII. */
442 char swidth[PNG_sCAL_MAX_DIGITS+1];
443 char sheight[PNG_sCAL_MAX_DIGITS+1];
444
445 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
446 PNG_sCAL_PRECISION);
447 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
448 PNG_sCAL_PRECISION);
449
450 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
451 }
452 }
453 # endif
454
455 # ifdef PNG_FIXED_POINT_SUPPORTED
456 void PNGAPI
457 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
458 png_fixed_point width, png_fixed_point height)
459 {
460 png_debug1(1, "in %s storage function", "sCAL");
461
462 /* Check the arguments. */
463 if (width <= 0)
464 png_warning(png_ptr, "Invalid sCAL width ignored");
465
466 else if (height <= 0)
467 png_warning(png_ptr, "Invalid sCAL height ignored");
468
469 else
470 {
471 /* Convert 'width' and 'height' to ASCII. */
472 char swidth[PNG_sCAL_MAX_DIGITS+1];
473 char sheight[PNG_sCAL_MAX_DIGITS+1];
474
475 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
476 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
477
478 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
479 }
480 }
481 # endif
482 #endif
483
484 #ifdef PNG_pHYs_SUPPORTED
485 void PNGAPI
486 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
487 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
488 {
489 png_debug1(1, "in %s storage function", "pHYs");
490
491 if (png_ptr == NULL || info_ptr == NULL)
492 return;
493
494 info_ptr->x_pixels_per_unit = res_x;
495 info_ptr->y_pixels_per_unit = res_y;
496 info_ptr->phys_unit_type = (png_byte)unit_type;
497 info_ptr->valid |= PNG_INFO_pHYs;
498 }
499 #endif
500
501 void PNGAPI
502 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
503 png_const_colorp palette, int num_palette)
504 {
505
506 png_debug1(1, "in %s storage function", "PLTE");
507
508 if (png_ptr == NULL || info_ptr == NULL)
509 return;
510
511 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
512 {
513 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
514 png_error(png_ptr, "Invalid palette length");
515
516 else
517 {
518 png_warning(png_ptr, "Invalid palette length");
519 return;
520 }
521 }
522
523 if ((num_palette > 0 && palette == NULL) ||
524 (num_palette == 0
525 # ifdef PNG_MNG_FEATURES_SUPPORTED
526 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
527 # endif
528 ))
529 {
530 png_error(png_ptr, "Invalid palette");
531 return;
532 }
533
534 /* It may not actually be necessary to set png_ptr->palette here;
535 * we do it for backward compatibility with the way the png_handle_tRNS
536 * function used to do the allocation.
537 *
538 * 1.6.0: the above statement appears to be incorrect; something has to set
539 * the palette inside png_struct on read.
540 */
541 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
542
543 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
544 * of num_palette entries, in case of an invalid PNG file that has
545 * too-large sample values.
546 */
547 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
548 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
549
550 if (num_palette > 0)
551 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
552 info_ptr->palette = png_ptr->palette;
553 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
554
555 info_ptr->free_me |= PNG_FREE_PLTE;
556
557 info_ptr->valid |= PNG_INFO_PLTE;
558 }
559
560 #ifdef PNG_sBIT_SUPPORTED
561 void PNGAPI
562 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
563 png_const_color_8p sig_bit)
564 {
565 png_debug1(1, "in %s storage function", "sBIT");
566
567 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
568 return;
569
570 info_ptr->sig_bit = *sig_bit;
571 info_ptr->valid |= PNG_INFO_sBIT;
572 }
573 #endif
574
575 #ifdef PNG_sRGB_SUPPORTED
576 void PNGAPI
577 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
578 {
579 png_debug1(1, "in %s storage function", "sRGB");
580
581 if (png_ptr == NULL || info_ptr == NULL)
582 return;
583
584 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
585 png_colorspace_sync_info(png_ptr, info_ptr);
586 }
587
588 void PNGAPI
589 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
590 int srgb_intent)
591 {
592 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
593
594 if (png_ptr == NULL || info_ptr == NULL)
595 return;
596
597 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent))
598 {
599 /* This causes the gAMA and cHRM to be written too */
600 info_ptr->colorspace.flags |=
601 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
602 }
603
604 png_colorspace_sync_info(png_ptr, info_ptr);
605 }
606 #endif /* sRGB */
607
608
609 #ifdef PNG_iCCP_SUPPORTED
610 void PNGAPI
611 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
612 png_const_charp name, int compression_type,
613 png_const_bytep profile, png_uint_32 proflen)
614 {
615 png_charp new_iccp_name;
616 png_bytep new_iccp_profile;
617 png_size_t length;
618
619 png_debug1(1, "in %s storage function", "iCCP");
620
621 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
622 return;
623
624 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
625 png_app_error(png_ptr, "Invalid iCCP compression method");
626
627 /* Set the colorspace first because this validates the profile; do not
628 * override previously set app cHRM or gAMA here (because likely as not the
629 * application knows better than libpng what the correct values are.) Pass
630 * the info_ptr color_type field to png_colorspace_set_ICC because in the
631 * write case it has not yet been stored in png_ptr.
632 */
633 {
634 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
635 proflen, profile, info_ptr->color_type);
636
637 png_colorspace_sync_info(png_ptr, info_ptr);
638
639 /* Don't do any of the copying if the profile was bad, or inconsistent. */
640 if (!result)
641 return;
642
643 /* But do write the gAMA and cHRM chunks from the profile. */
644 info_ptr->colorspace.flags |=
645 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
646 }
647
648 length = strlen(name)+1;
649 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
650
651 if (new_iccp_name == NULL)
652 {
653 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
654 return;
655 }
656
657 memcpy(new_iccp_name, name, length);
658 new_iccp_profile = png_voidcast(png_bytep,
659 png_malloc_warn(png_ptr, proflen));
660
661 if (new_iccp_profile == NULL)
662 {
663 png_free(png_ptr, new_iccp_name);
664 png_benign_error(png_ptr,
665 "Insufficient memory to process iCCP profile");
666 return;
667 }
668
669 memcpy(new_iccp_profile, profile, proflen);
670
671 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
672
673 info_ptr->iccp_proflen = proflen;
674 info_ptr->iccp_name = new_iccp_name;
675 info_ptr->iccp_profile = new_iccp_profile;
676 info_ptr->free_me |= PNG_FREE_ICCP;
677 info_ptr->valid |= PNG_INFO_iCCP;
678 }
679 #endif
680
681 #ifdef PNG_TEXT_SUPPORTED
682 void PNGAPI
683 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
684 png_const_textp text_ptr, int num_text)
685 {
686 int ret;
687 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
688
689 if (ret)
690 png_error(png_ptr, "Insufficient memory to store text");
691 }
692
693 int /* PRIVATE */
694 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
695 png_const_textp text_ptr, int num_text)
696 {
697 int i;
698
699 png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :
700 (unsigned long)png_ptr->chunk_name);
701
702 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
703 return(0);
704
705 /* Make sure we have enough space in the "text" array in info_struct
706 * to hold all of the incoming text_ptr objects. This compare can't overflow
707 * because max_text >= num_text (anyway, subtract of two positive integers
708 * can't overflow in any case.)
709 */
710 if (num_text > info_ptr->max_text - info_ptr->num_text)
711 {
712 int old_num_text = info_ptr->num_text;
713 int max_text;
714 png_textp new_text = NULL;
715
716 /* Calculate an appropriate max_text, checking for overflow. */
717 max_text = old_num_text;
718 if (num_text <= INT_MAX - max_text)
719 {
720 max_text += num_text;
721
722 /* Round up to a multiple of 8 */
723 if (max_text < INT_MAX-8)
724 max_text = (max_text + 8) & ~0x7;
725
726 else
727 max_text = INT_MAX;
728
729 /* Now allocate a new array and copy the old members in, this does all
730 * the overflow checks.
731 */
732 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
733 info_ptr->text, old_num_text, max_text-old_num_text,
734 sizeof *new_text));
735 }
736
737 if (new_text == NULL)
738 {
739 png_chunk_report(png_ptr, "too many text chunks",
740 PNG_CHUNK_WRITE_ERROR);
741 return 1;
742 }
743
744 png_free(png_ptr, info_ptr->text);
745
746 info_ptr->text = new_text;
747 info_ptr->free_me |= PNG_FREE_TEXT;
748 info_ptr->max_text = max_text;
749 /* num_text is adjusted below as the entries are copied in */
750
751 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
752 }
753
754 for (i = 0; i < num_text; i++)
755 {
756 size_t text_length, key_len;
757 size_t lang_len, lang_key_len;
758 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
759
760 if (text_ptr[i].key == NULL)
761 continue;
762
763 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
764 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
765 {
766 png_chunk_report(png_ptr, "text compression mode is out of range",
767 PNG_CHUNK_WRITE_ERROR);
768 continue;
769 }
770
771 key_len = strlen(text_ptr[i].key);
772
773 if (text_ptr[i].compression <= 0)
774 {
775 lang_len = 0;
776 lang_key_len = 0;
777 }
778
779 else
780 # ifdef PNG_iTXt_SUPPORTED
781 {
782 /* Set iTXt data */
783
784 if (text_ptr[i].lang != NULL)
785 lang_len = strlen(text_ptr[i].lang);
786
787 else
788 lang_len = 0;
789
790 if (text_ptr[i].lang_key != NULL)
791 lang_key_len = strlen(text_ptr[i].lang_key);
792
793 else
794 lang_key_len = 0;
795 }
796 # else /* PNG_iTXt_SUPPORTED */
797 {
798 png_chunk_report(png_ptr, "iTXt chunk not supported",
799 PNG_CHUNK_WRITE_ERROR);
800 continue;
801 }
802 # endif
803
804 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
805 {
806 text_length = 0;
807 # ifdef PNG_iTXt_SUPPORTED
808 if (text_ptr[i].compression > 0)
809 textp->compression = PNG_ITXT_COMPRESSION_NONE;
810
811 else
812 # endif
813 textp->compression = PNG_TEXT_COMPRESSION_NONE;
814 }
815
816 else
817 {
818 text_length = strlen(text_ptr[i].text);
819 textp->compression = text_ptr[i].compression;
820 }
821
822 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
823 key_len + text_length + lang_len + lang_key_len + 4));
824
825 if (textp->key == NULL)
826 {
827 png_chunk_report(png_ptr, "text chunk: out of memory",
828 PNG_CHUNK_WRITE_ERROR);
829 return 1;
830 }
831
832 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
833 (unsigned long)(png_uint_32)
834 (key_len + lang_len + lang_key_len + text_length + 4),
835 textp->key);
836
837 memcpy(textp->key, text_ptr[i].key, key_len);
838 *(textp->key + key_len) = '\0';
839
840 if (text_ptr[i].compression > 0)
841 {
842 textp->lang = textp->key + key_len + 1;
843 memcpy(textp->lang, text_ptr[i].lang, lang_len);
844 *(textp->lang + lang_len) = '\0';
845 textp->lang_key = textp->lang + lang_len + 1;
846 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
847 *(textp->lang_key + lang_key_len) = '\0';
848 textp->text = textp->lang_key + lang_key_len + 1;
849 }
850
851 else
852 {
853 textp->lang=NULL;
854 textp->lang_key=NULL;
855 textp->text = textp->key + key_len + 1;
856 }
857
858 if (text_length)
859 memcpy(textp->text, text_ptr[i].text, text_length);
860
861 *(textp->text + text_length) = '\0';
862
863 # ifdef PNG_iTXt_SUPPORTED
864 if (textp->compression > 0)
865 {
866 textp->text_length = 0;
867 textp->itxt_length = text_length;
868 }
869
870 else
871 # endif
872 {
873 textp->text_length = text_length;
874 textp->itxt_length = 0;
875 }
876
877 info_ptr->num_text++;
878 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
879 }
880
881 return(0);
882 }
883 #endif
884
885 #ifdef PNG_tIME_SUPPORTED
886 void PNGAPI
887 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
888 png_const_timep mod_time)
889 {
890 png_debug1(1, "in %s storage function", "tIME");
891
892 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
893 (png_ptr->mode & PNG_WROTE_tIME))
894 return;
895
896 if (mod_time->month == 0 || mod_time->month > 12 ||
897 mod_time->day == 0 || mod_time->day > 31 ||
898 mod_time->hour > 23 || mod_time->minute > 59 ||
899 mod_time->second > 60)
900 {
901 png_warning(png_ptr, "Ignoring invalid time value");
902 return;
903 }
904
905 info_ptr->mod_time = *mod_time;
906 info_ptr->valid |= PNG_INFO_tIME;
907 }
908 #endif
909
910 #ifdef PNG_tRNS_SUPPORTED
911 void PNGAPI
912 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
913 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
914 {
915 png_debug1(1, "in %s storage function", "tRNS");
916
917 if (png_ptr == NULL || info_ptr == NULL)
918 return;
919
920 if (trans_alpha != NULL)
921 {
922 /* It may not actually be necessary to set png_ptr->trans_alpha here;
923 * we do it for backward compatibility with the way the png_handle_tRNS
924 * function used to do the allocation.
925 *
926 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
927 * relies on png_set_tRNS storing the information in png_struct
928 * (otherwise it won't be there for the code in pngrtran.c).
929 */
930
931 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
932
933 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
934 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
935 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
936
937 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
938 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
939 }
940
941 if (trans_color != NULL)
942 {
943 int sample_max = (1 << info_ptr->bit_depth);
944
945 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
946 trans_color->gray > sample_max) ||
947 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
948 (trans_color->red > sample_max ||
949 trans_color->green > sample_max ||
950 trans_color->blue > sample_max)))
951 png_warning(png_ptr,
952 "tRNS chunk has out-of-range samples for bit_depth");
953
954 info_ptr->trans_color = *trans_color;
955
956 if (num_trans == 0)
957 num_trans = 1;
958 }
959
960 info_ptr->num_trans = (png_uint_16)num_trans;
961
962 if (num_trans != 0)
963 {
964 info_ptr->valid |= PNG_INFO_tRNS;
965 info_ptr->free_me |= PNG_FREE_TRNS;
966 }
967 }
968 #endif
969
970 #ifdef PNG_sPLT_SUPPORTED
971 void PNGAPI
972 png_set_sPLT(png_const_structrp png_ptr,
973 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
974 /*
975 * entries - array of png_sPLT_t structures
976 * to be added to the list of palettes
977 * in the info structure.
978 *
979 * nentries - number of palette structures to be
980 * added.
981 */
982 {
983 png_sPLT_tp np;
984
985 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
986 return;
987
988 /* Use the internal realloc function, which checks for all the possible
989 * overflows. Notice that the parameters are (int) and (size_t)
990 */
991 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
992 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
993 sizeof *np));
994
995 if (np == NULL)
996 {
997 /* Out of memory or too many chunks */
998 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
999 return;
1000 }
1001
1002 png_free(png_ptr, info_ptr->splt_palettes);
1003 info_ptr->splt_palettes = np;
1004 info_ptr->free_me |= PNG_FREE_SPLT;
1005
1006 np += info_ptr->splt_palettes_num;
1007
1008 do
1009 {
1010 png_size_t length;
1011
1012 /* Skip invalid input entries */
1013 if (entries->name == NULL || entries->entries == NULL)
1014 {
1015 /* png_handle_sPLT doesn't do this, so this is an app error */
1016 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1017 /* Just skip the invalid entry */
1018 continue;
1019 }
1020
1021 np->depth = entries->depth;
1022
1023 /* In the even of out-of-memory just return - there's no point keeping on
1024 * trying to add sPLT chunks.
1025 */
1026 length = strlen(entries->name) + 1;
1027 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1028
1029 if (np->name == NULL)
1030 break;
1031
1032 memcpy(np->name, entries->name, length);
1033
1034 /* IMPORTANT: we have memory now that won't get freed if something else
1035 * goes wrong, this code must free it. png_malloc_array produces no
1036 * warnings, use a png_chunk_report (below) if there is an error.
1037 */
1038 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1039 entries->nentries, sizeof (png_sPLT_entry)));
1040
1041 if (np->entries == NULL)
1042 {
1043 png_free(png_ptr, np->name);
1044 break;
1045 }
1046
1047 np->nentries = entries->nentries;
1048 /* This multiply can't overflow because png_malloc_array has already
1049 * checked it when doing the allocation.
1050 */
1051 memcpy(np->entries, entries->entries,
1052 entries->nentries * sizeof (png_sPLT_entry));
1053
1054 /* Note that 'continue' skips the advance of the out pointer and out
1055 * count, so an invalid entry is not added.
1056 */
1057 info_ptr->valid |= PNG_INFO_sPLT;
1058 ++(info_ptr->splt_palettes_num);
1059 ++np;
1060 }
1061 while (++entries, --nentries);
1062
1063 if (nentries > 0)
1064 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1065 }
1066 #endif /* PNG_sPLT_SUPPORTED */
1067
1068 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1069 static png_byte
1070 check_location(png_const_structrp png_ptr, int location)
1071 {
1072 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1073
1074 /* New in 1.6.0; copy the location and check it. This is an API
1075 * change, previously the app had to use the
1076 * png_set_unknown_chunk_location API below for each chunk.
1077 */
1078 if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT))
1079 {
1080 /* Write struct, so unknown chunks come from the app */
1081 png_app_warning(png_ptr,
1082 "png_set_unknown_chunks now expects a valid location");
1083 /* Use the old behavior */
1084 location = (png_byte)(png_ptr->mode &
1085 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1086 }
1087
1088 /* This need not be an internal error - if the app calls
1089 * png_set_unknown_chunks on a read pointer it must get the location right.
1090 */
1091 if (location == 0)
1092 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1093
1094 /* Now reduce the location to the top-most set bit by removing each least
1095 * significant bit in turn.
1096 */
1097 while (location != (location & -location))
1098 location &= ~(location & -location);
1099
1100 /* The cast is safe because 'location' is a bit mask and only the low four
1101 * bits are significant.
1102 */
1103 return (png_byte)location;
1104 }
1105
1106 void PNGAPI
1107 png_set_unknown_chunks(png_const_structrp png_ptr,
1108 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1109 {
1110 png_unknown_chunkp np;
1111
1112 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1113 unknowns == NULL)
1114 return;
1115
1116 /* Check for the failure cases where support has been disabled at compile
1117 * time. This code is hardly ever compiled - it's here because
1118 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1119 * code) but may be meaningless if the read or write handling of unknown
1120 * chunks is not compiled in.
1121 */
1122 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1123 defined(PNG_READ_SUPPORTED)
1124 if (png_ptr->mode & PNG_IS_READ_STRUCT)
1125 {
1126 png_app_error(png_ptr, "no unknown chunk support on read");
1127 return;
1128 }
1129 # endif
1130 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1131 defined(PNG_WRITE_SUPPORTED)
1132 if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
1133 {
1134 png_app_error(png_ptr, "no unknown chunk support on write");
1135 return;
1136 }
1137 # endif
1138
1139 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1140 * unknown critical chunks could be lost with just a warning resulting in
1141 * undefined behavior. Now png_chunk_report is used to provide behavior
1142 * appropriate to read or write.
1143 */
1144 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1145 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1146 sizeof *np));
1147
1148 if (np == NULL)
1149 {
1150 png_chunk_report(png_ptr, "too many unknown chunks",
1151 PNG_CHUNK_WRITE_ERROR);
1152 return;
1153 }
1154
1155 png_free(png_ptr, info_ptr->unknown_chunks);
1156 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1157 info_ptr->free_me |= PNG_FREE_UNKN;
1158
1159 np += info_ptr->unknown_chunks_num;
1160
1161 /* Increment unknown_chunks_num each time round the loop to protect the
1162 * just-allocated chunk data.
1163 */
1164 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1165 {
1166 memcpy(np->name, unknowns->name, (sizeof np->name));
1167 np->name[(sizeof np->name)-1] = '\0';
1168 np->location = check_location(png_ptr, unknowns->location);
1169
1170 if (unknowns->size == 0)
1171 {
1172 np->data = NULL;
1173 np->size = 0;
1174 }
1175
1176 else
1177 {
1178 np->data = png_voidcast(png_bytep,
1179 png_malloc_base(png_ptr, unknowns->size));
1180
1181 if (np->data == NULL)
1182 {
1183 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1184 PNG_CHUNK_WRITE_ERROR);
1185 /* But just skip storing the unknown chunk */
1186 continue;
1187 }
1188
1189 memcpy(np->data, unknowns->data, unknowns->size);
1190 np->size = unknowns->size;
1191 }
1192
1193 /* These increments are skipped on out-of-memory for the data - the
1194 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1195 * This is correct in the read case (the chunk is just dropped.)
1196 */
1197 ++np;
1198 ++(info_ptr->unknown_chunks_num);
1199 }
1200 }
1201
1202 void PNGAPI
1203 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1204 int chunk, int location)
1205 {
1206 /* This API is pretty pointless in 1.6.0 because the location can be set
1207 * before the call to png_set_unknown_chunks.
1208 *
1209 * TODO: add a png_app_warning in 1.7
1210 */
1211 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1212 chunk < info_ptr->unknown_chunks_num)
1213 {
1214 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1215 {
1216 png_app_error(png_ptr, "invalid unknown chunk location");
1217 /* Fake out the pre 1.6.0 behavior: */
1218 if ((location & PNG_HAVE_IDAT)) /* undocumented! */
1219 location = PNG_AFTER_IDAT;
1220
1221 else
1222 location = PNG_HAVE_IHDR; /* also undocumented */
1223 }
1224
1225 info_ptr->unknown_chunks[chunk].location =
1226 check_location(png_ptr, location);
1227 }
1228 }
1229 #endif
1230
1231
1232 #ifdef PNG_MNG_FEATURES_SUPPORTED
1233 png_uint_32 PNGAPI
1234 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1235 {
1236 png_debug(1, "in png_permit_mng_features");
1237
1238 if (png_ptr == NULL)
1239 return 0;
1240
1241 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1242
1243 return png_ptr->mng_features_permitted;
1244 }
1245 #endif
1246
1247 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1248 static unsigned int
1249 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1250 {
1251 unsigned int i;
1252
1253 /* Utility function: update the 'keep' state of a chunk if it is already in
1254 * the list, otherwise add it to the list.
1255 */
1256 for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0)
1257 {
1258 list[4] = (png_byte)keep;
1259 return count;
1260 }
1261
1262 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1263 {
1264 ++count;
1265 memcpy(list, add, 4);
1266 list[4] = (png_byte)keep;
1267 }
1268
1269 return count;
1270 }
1271
1272 void PNGAPI
1273 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1274 png_const_bytep chunk_list, int num_chunks_in)
1275 {
1276 png_bytep new_list;
1277 unsigned int num_chunks, old_num_chunks;
1278
1279 if (png_ptr == NULL)
1280 return;
1281
1282 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1283 {
1284 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1285 return;
1286 }
1287
1288 if (num_chunks_in <= 0)
1289 {
1290 png_ptr->unknown_default = keep;
1291
1292 /* '0' means just set the flags, so stop here */
1293 if (num_chunks_in == 0)
1294 return;
1295 }
1296
1297 if (num_chunks_in < 0)
1298 {
1299 /* Ignore all unknown chunks and all chunks recognized by
1300 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1301 */
1302 static PNG_CONST png_byte chunks_to_ignore[] = {
1303 98, 75, 71, 68, '\0', /* bKGD */
1304 99, 72, 82, 77, '\0', /* cHRM */
1305 103, 65, 77, 65, '\0', /* gAMA */
1306 104, 73, 83, 84, '\0', /* hIST */
1307 105, 67, 67, 80, '\0', /* iCCP */
1308 105, 84, 88, 116, '\0', /* iTXt */
1309 111, 70, 70, 115, '\0', /* oFFs */
1310 112, 67, 65, 76, '\0', /* pCAL */
1311 112, 72, 89, 115, '\0', /* pHYs */
1312 115, 66, 73, 84, '\0', /* sBIT */
1313 115, 67, 65, 76, '\0', /* sCAL */
1314 115, 80, 76, 84, '\0', /* sPLT */
1315 115, 84, 69, 82, '\0', /* sTER */
1316 115, 82, 71, 66, '\0', /* sRGB */
1317 116, 69, 88, 116, '\0', /* tEXt */
1318 116, 73, 77, 69, '\0', /* tIME */
1319 122, 84, 88, 116, '\0' /* zTXt */
1320 };
1321
1322 chunk_list = chunks_to_ignore;
1323 num_chunks = (sizeof chunks_to_ignore)/5;
1324 }
1325
1326 else /* num_chunks_in > 0 */
1327 {
1328 if (chunk_list == NULL)
1329 {
1330 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1331 * which can be switched off.
1332 */
1333 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1334 return;
1335 }
1336
1337 num_chunks = num_chunks_in;
1338 }
1339
1340 old_num_chunks = png_ptr->num_chunk_list;
1341 if (png_ptr->chunk_list == NULL)
1342 old_num_chunks = 0;
1343
1344 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1345 */
1346 if (num_chunks + old_num_chunks > UINT_MAX/5)
1347 {
1348 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1349 return;
1350 }
1351
1352 /* If these chunks are being reset to the default then no more memory is
1353 * required because add_one_chunk above doesn't extend the list if the 'keep'
1354 * parameter is the default.
1355 */
1356 if (keep)
1357 {
1358 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1359 5 * (num_chunks + old_num_chunks)));
1360
1361 if (old_num_chunks > 0)
1362 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1363 }
1364
1365 else if (old_num_chunks > 0)
1366 new_list = png_ptr->chunk_list;
1367
1368 else
1369 new_list = NULL;
1370
1371 /* Add the new chunks together with each one's handling code. If the chunk
1372 * already exists the code is updated, otherwise the chunk is added to the
1373 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1374 * the earlier convention that the last setting is the one that is used.)
1375 */
1376 if (new_list != NULL)
1377 {
1378 png_const_bytep inlist;
1379 png_bytep outlist;
1380 unsigned int i;
1381
1382 for (i=0; i<num_chunks; ++i)
1383 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1384 chunk_list+5*i, keep);
1385
1386 /* Now remove any spurious 'default' entries. */
1387 num_chunks = 0;
1388 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1389 if (inlist[4])
1390 {
1391 if (outlist != inlist)
1392 memcpy(outlist, inlist, 5);
1393 outlist += 5;
1394 ++num_chunks;
1395 }
1396
1397 /* This means the application has removed all the specialized handling. */
1398 if (num_chunks == 0)
1399 {
1400 if (png_ptr->chunk_list != new_list)
1401 png_free(png_ptr, new_list);
1402
1403 new_list = NULL;
1404 }
1405 }
1406
1407 else
1408 num_chunks = 0;
1409
1410 png_ptr->num_chunk_list = num_chunks;
1411
1412 if (png_ptr->chunk_list != new_list)
1413 {
1414 if (png_ptr->chunk_list != NULL)
1415 png_free(png_ptr, png_ptr->chunk_list);
1416
1417 png_ptr->chunk_list = new_list;
1418 }
1419 }
1420 #endif
1421
1422 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1423 void PNGAPI
1424 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1425 png_user_chunk_ptr read_user_chunk_fn)
1426 {
1427 png_debug(1, "in png_set_read_user_chunk_fn");
1428
1429 if (png_ptr == NULL)
1430 return;
1431
1432 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1433 png_ptr->user_chunk_ptr = user_chunk_ptr;
1434 }
1435 #endif
1436
1437 #ifdef PNG_INFO_IMAGE_SUPPORTED
1438 void PNGAPI
1439 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1440 png_bytepp row_pointers)
1441 {
1442 png_debug1(1, "in %s storage function", "rows");
1443
1444 if (png_ptr == NULL || info_ptr == NULL)
1445 return;
1446
1447 if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1448 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1449
1450 info_ptr->row_pointers = row_pointers;
1451
1452 if (row_pointers)
1453 info_ptr->valid |= PNG_INFO_IDAT;
1454 }
1455 #endif
1456
1457 void PNGAPI
1458 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
1459 {
1460 if (png_ptr == NULL)
1461 return;
1462
1463 if (size == 0 || size > PNG_UINT_31_MAX)
1464 png_error(png_ptr, "invalid compression buffer size");
1465
1466 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1467 if (png_ptr->mode & PNG_IS_READ_STRUCT)
1468 {
1469 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1470 return;
1471 }
1472 # endif
1473
1474 # ifdef PNG_WRITE_SUPPORTED
1475 if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
1476 {
1477 if (png_ptr->zowner != 0)
1478 {
1479 png_warning(png_ptr,
1480 "Compression buffer size cannot be changed because it is in use");
1481 return;
1482 }
1483
1484 if (size > ZLIB_IO_MAX)
1485 {
1486 png_warning(png_ptr,
1487 "Compression buffer size limited to system maximum");
1488 size = ZLIB_IO_MAX; /* must fit */
1489 }
1490
1491 else if (size < 6)
1492 {
1493 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1494 * if this is permitted.
1495 */
1496 png_warning(png_ptr,
1497 "Compression buffer size cannot be reduced below 6");
1498 return;
1499 }
1500
1501 if (png_ptr->zbuffer_size != size)
1502 {
1503 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1504 png_ptr->zbuffer_size = (uInt)size;
1505 }
1506 }
1507 # endif
1508 }
1509
1510 void PNGAPI
1511 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1512 {
1513 if (png_ptr && info_ptr)
1514 info_ptr->valid &= ~mask;
1515 }
1516
1517
1518 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1519 /* This function was added to libpng 1.2.6 */
1520 void PNGAPI
1521 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1522 png_uint_32 user_height_max)
1523 {
1524 /* Images with dimensions larger than these limits will be
1525 * rejected by png_set_IHDR(). To accept any PNG datastream
1526 * regardless of dimensions, set both limits to 0x7ffffffL.
1527 */
1528 if (png_ptr == NULL)
1529 return;
1530
1531 png_ptr->user_width_max = user_width_max;
1532 png_ptr->user_height_max = user_height_max;
1533 }
1534
1535 /* This function was added to libpng 1.4.0 */
1536 void PNGAPI
1537 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1538 {
1539 if (png_ptr)
1540 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1541 }
1542
1543 /* This function was added to libpng 1.4.1 */
1544 void PNGAPI
1545 png_set_chunk_malloc_max (png_structrp png_ptr,
1546 png_alloc_size_t user_chunk_malloc_max)
1547 {
1548 if (png_ptr)
1549 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1550 }
1551 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1552
1553
1554 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1555 void PNGAPI
1556 png_set_benign_errors(png_structrp png_ptr, int allowed)
1557 {
1558 png_debug(1, "in png_set_benign_errors");
1559
1560 /* If allowed is 1, png_benign_error() is treated as a warning.
1561 *
1562 * If allowed is 0, png_benign_error() is treated as an error (which
1563 * is the default behavior if png_set_benign_errors() is not called).
1564 */
1565
1566 if (allowed)
1567 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1568 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1569
1570 else
1571 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1572 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1573 }
1574 #endif /* PNG_BENIGN_ERRORS_SUPPORTED */
1575
1576 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1577 /* Whether to report invalid palette index; added at libng-1.5.10.
1578 * It is possible for an indexed (color-type==3) PNG file to contain
1579 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1580 * fewer entries than the image's bit-depth would allow. We recover
1581 * from this gracefully by filling any incomplete palette with zeroes
1582 * (opaque black). By default, when this occurs libpng will issue
1583 * a benign error. This API can be used to override that behavior.
1584 */
1585 void PNGAPI
1586 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1587 {
1588 png_debug(1, "in png_set_check_for_invalid_index");
1589
1590 if (allowed > 0)
1591 png_ptr->num_palette_max = 0;
1592
1593 else
1594 png_ptr->num_palette_max = -1;
1595 }
1596 #endif
1597 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */