1
2 /* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.6.24 [August 4, 2016]
5 * Copyright (c) 1998-2016 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
png_set_bKGD(png_const_structrp png_ptr,png_inforp info_ptr,png_const_color_16p background)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
png_set_cHRM_fixed(png_const_structrp png_ptr,png_inforp info_ptr,png_fixed_point white_x,png_fixed_point white_y,png_fixed_point red_x,png_fixed_point red_y,png_fixed_point green_x,png_fixed_point green_y,png_fixed_point blue_x,png_fixed_point blue_y)40 png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
41 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
42 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
43 png_fixed_point blue_x, png_fixed_point blue_y)
44 {
45 png_xy xy;
46
47 png_debug1(1, "in %s storage function", "cHRM fixed");
48
49 if (png_ptr == NULL || info_ptr == NULL)
50 return;
51
52 xy.redx = red_x;
53 xy.redy = red_y;
54 xy.greenx = green_x;
55 xy.greeny = green_y;
56 xy.bluex = blue_x;
57 xy.bluey = blue_y;
58 xy.whitex = white_x;
59 xy.whitey = white_y;
60
61 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
62 2/* override with app values*/) != 0)
63 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
64
65 png_colorspace_sync_info(png_ptr, info_ptr);
66 }
67
68 void PNGFAPI
png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr,png_inforp info_ptr,png_fixed_point int_red_X,png_fixed_point int_red_Y,png_fixed_point int_red_Z,png_fixed_point int_green_X,png_fixed_point int_green_Y,png_fixed_point int_green_Z,png_fixed_point int_blue_X,png_fixed_point int_blue_Y,png_fixed_point int_blue_Z)69 png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
70 png_fixed_point int_red_X, png_fixed_point int_red_Y,
71 png_fixed_point int_red_Z, png_fixed_point int_green_X,
72 png_fixed_point int_green_Y, png_fixed_point int_green_Z,
73 png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
74 png_fixed_point int_blue_Z)
75 {
76 png_XYZ XYZ;
77
78 png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
79
80 if (png_ptr == NULL || info_ptr == NULL)
81 return;
82
83 XYZ.red_X = int_red_X;
84 XYZ.red_Y = int_red_Y;
85 XYZ.red_Z = int_red_Z;
86 XYZ.green_X = int_green_X;
87 XYZ.green_Y = int_green_Y;
88 XYZ.green_Z = int_green_Z;
89 XYZ.blue_X = int_blue_X;
90 XYZ.blue_Y = int_blue_Y;
91 XYZ.blue_Z = int_blue_Z;
92
93 if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace,
94 &XYZ, 2) != 0)
95 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
96
97 png_colorspace_sync_info(png_ptr, info_ptr);
98 }
99
100 # ifdef PNG_FLOATING_POINT_SUPPORTED
101 void PNGAPI
png_set_cHRM(png_const_structrp png_ptr,png_inforp info_ptr,double white_x,double white_y,double red_x,double red_y,double green_x,double green_y,double blue_x,double blue_y)102 png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
103 double white_x, double white_y, double red_x, double red_y,
104 double green_x, double green_y, double blue_x, double blue_y)
105 {
106 png_set_cHRM_fixed(png_ptr, info_ptr,
107 png_fixed(png_ptr, white_x, "cHRM White X"),
108 png_fixed(png_ptr, white_y, "cHRM White Y"),
109 png_fixed(png_ptr, red_x, "cHRM Red X"),
110 png_fixed(png_ptr, red_y, "cHRM Red Y"),
111 png_fixed(png_ptr, green_x, "cHRM Green X"),
112 png_fixed(png_ptr, green_y, "cHRM Green Y"),
113 png_fixed(png_ptr, blue_x, "cHRM Blue X"),
114 png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
115 }
116
117 void PNGAPI
png_set_cHRM_XYZ(png_const_structrp png_ptr,png_inforp info_ptr,double red_X,double red_Y,double red_Z,double green_X,double green_Y,double green_Z,double blue_X,double blue_Y,double blue_Z)118 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
119 double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
120 double blue_X, double blue_Y, double blue_Z)
121 {
122 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
123 png_fixed(png_ptr, red_X, "cHRM Red X"),
124 png_fixed(png_ptr, red_Y, "cHRM Red Y"),
125 png_fixed(png_ptr, red_Z, "cHRM Red Z"),
126 png_fixed(png_ptr, green_X, "cHRM Green X"),
127 png_fixed(png_ptr, green_Y, "cHRM Green Y"),
128 png_fixed(png_ptr, green_Z, "cHRM Green Z"),
129 png_fixed(png_ptr, blue_X, "cHRM Blue X"),
130 png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
131 png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
132 }
133 # endif /* FLOATING_POINT */
134
135 #endif /* cHRM */
136
137 #ifdef PNG_gAMA_SUPPORTED
138 void PNGFAPI
png_set_gAMA_fixed(png_const_structrp png_ptr,png_inforp info_ptr,png_fixed_point file_gamma)139 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
140 png_fixed_point file_gamma)
141 {
142 png_debug1(1, "in %s storage function", "gAMA");
143
144 if (png_ptr == NULL || info_ptr == NULL)
145 return;
146
147 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
148 png_colorspace_sync_info(png_ptr, info_ptr);
149 }
150
151 # ifdef PNG_FLOATING_POINT_SUPPORTED
152 void PNGAPI
png_set_gAMA(png_const_structrp png_ptr,png_inforp info_ptr,double file_gamma)153 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
154 {
155 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
156 "png_set_gAMA"));
157 }
158 # endif
159 #endif
160
161 #ifdef PNG_hIST_SUPPORTED
162 void PNGAPI
png_set_hIST(png_const_structrp png_ptr,png_inforp info_ptr,png_const_uint_16p hist)163 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
164 png_const_uint_16p hist)
165 {
166 int i;
167
168 png_debug1(1, "in %s storage function", "hIST");
169
170 if (png_ptr == NULL || info_ptr == NULL)
171 return;
172
173 if (info_ptr->num_palette == 0 || info_ptr->num_palette
174 > PNG_MAX_PALETTE_LENGTH)
175 {
176 png_warning(png_ptr,
177 "Invalid palette size, hIST allocation skipped");
178
179 return;
180 }
181
182 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
183
184 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
185 * version 1.2.1
186 */
187 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
188 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
189
190 if (info_ptr->hist == NULL)
191 {
192 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
193
194 return;
195 }
196
197 info_ptr->free_me |= PNG_FREE_HIST;
198
199 for (i = 0; i < info_ptr->num_palette; i++)
200 info_ptr->hist[i] = hist[i];
201
202 info_ptr->valid |= PNG_INFO_hIST;
203 }
204 #endif
205
206 void PNGAPI
png_set_IHDR(png_const_structrp png_ptr,png_inforp info_ptr,png_uint_32 width,png_uint_32 height,int bit_depth,int color_type,int interlace_type,int compression_type,int filter_type)207 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
208 png_uint_32 width, png_uint_32 height, int bit_depth,
209 int color_type, int interlace_type, int compression_type,
210 int filter_type)
211 {
212 png_debug1(1, "in %s storage function", "IHDR");
213
214 if (png_ptr == NULL || info_ptr == NULL)
215 return;
216
217 info_ptr->width = width;
218 info_ptr->height = height;
219 info_ptr->bit_depth = (png_byte)bit_depth;
220 info_ptr->color_type = (png_byte)color_type;
221 info_ptr->compression_type = (png_byte)compression_type;
222 info_ptr->filter_type = (png_byte)filter_type;
223 info_ptr->interlace_type = (png_byte)interlace_type;
224
225 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
226 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
227 info_ptr->compression_type, info_ptr->filter_type);
228
229 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
230 info_ptr->channels = 1;
231
232 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
233 info_ptr->channels = 3;
234
235 else
236 info_ptr->channels = 1;
237
238 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
239 info_ptr->channels++;
240
241 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
242
243 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
244 }
245
246 #ifdef PNG_oFFs_SUPPORTED
247 void PNGAPI
png_set_oFFs(png_const_structrp png_ptr,png_inforp info_ptr,png_int_32 offset_x,png_int_32 offset_y,int unit_type)248 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
249 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
250 {
251 png_debug1(1, "in %s storage function", "oFFs");
252
253 if (png_ptr == NULL || info_ptr == NULL)
254 return;
255
256 info_ptr->x_offset = offset_x;
257 info_ptr->y_offset = offset_y;
258 info_ptr->offset_unit_type = (png_byte)unit_type;
259 info_ptr->valid |= PNG_INFO_oFFs;
260 }
261 #endif
262
263 #ifdef PNG_pCAL_SUPPORTED
264 void PNGAPI
png_set_pCAL(png_const_structrp png_ptr,png_inforp info_ptr,png_const_charp purpose,png_int_32 X0,png_int_32 X1,int type,int nparams,png_const_charp units,png_charpp params)265 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
266 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
267 int nparams, png_const_charp units, png_charpp params)
268 {
269 png_size_t length;
270 int i;
271
272 png_debug1(1, "in %s storage function", "pCAL");
273
274 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
275 || (nparams > 0 && params == NULL))
276 return;
277
278 length = strlen(purpose) + 1;
279 png_debug1(3, "allocating purpose for info (%lu bytes)",
280 (unsigned long)length);
281
282 /* TODO: validate format of calibration name and unit name */
283
284 /* Check that the type matches the specification. */
285 if (type < 0 || type > 3)
286 png_error(png_ptr, "Invalid pCAL equation type");
287
288 if (nparams < 0 || nparams > 255)
289 png_error(png_ptr, "Invalid pCAL parameter count");
290
291 /* Validate params[nparams] */
292 for (i=0; i<nparams; ++i)
293 {
294 if (params[i] == NULL ||
295 !png_check_fp_string(params[i], strlen(params[i])))
296 png_error(png_ptr, "Invalid format for pCAL parameter");
297 }
298
299 info_ptr->pcal_purpose = png_voidcast(png_charp,
300 png_malloc_warn(png_ptr, length));
301
302 if (info_ptr->pcal_purpose == NULL)
303 {
304 png_warning(png_ptr, "Insufficient memory for pCAL purpose");
305
306 return;
307 }
308
309 memcpy(info_ptr->pcal_purpose, purpose, length);
310
311 png_debug(3, "storing X0, X1, type, and nparams in info");
312 info_ptr->pcal_X0 = X0;
313 info_ptr->pcal_X1 = X1;
314 info_ptr->pcal_type = (png_byte)type;
315 info_ptr->pcal_nparams = (png_byte)nparams;
316
317 length = strlen(units) + 1;
318 png_debug1(3, "allocating units for info (%lu bytes)",
319 (unsigned long)length);
320
321 info_ptr->pcal_units = png_voidcast(png_charp,
322 png_malloc_warn(png_ptr, length));
323
324 if (info_ptr->pcal_units == NULL)
325 {
326 png_warning(png_ptr, "Insufficient memory for pCAL units");
327
328 return;
329 }
330
331 memcpy(info_ptr->pcal_units, units, length);
332
333 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
334 (png_size_t)((nparams + 1) * (sizeof (png_charp)))));
335
336 if (info_ptr->pcal_params == NULL)
337 {
338 png_warning(png_ptr, "Insufficient memory for pCAL params");
339
340 return;
341 }
342
343 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
344
345 for (i = 0; i < nparams; i++)
346 {
347 length = strlen(params[i]) + 1;
348 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
349 (unsigned long)length);
350
351 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
352
353 if (info_ptr->pcal_params[i] == NULL)
354 {
355 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
356
357 return;
358 }
359
360 memcpy(info_ptr->pcal_params[i], params[i], length);
361 }
362
363 info_ptr->valid |= PNG_INFO_pCAL;
364 info_ptr->free_me |= PNG_FREE_PCAL;
365 }
366 #endif
367
368 #ifdef PNG_sCAL_SUPPORTED
369 void PNGAPI
png_set_sCAL_s(png_const_structrp png_ptr,png_inforp info_ptr,int unit,png_const_charp swidth,png_const_charp sheight)370 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
371 int unit, png_const_charp swidth, png_const_charp sheight)
372 {
373 png_size_t lengthw = 0, lengthh = 0;
374
375 png_debug1(1, "in %s storage function", "sCAL");
376
377 if (png_ptr == NULL || info_ptr == NULL)
378 return;
379
380 /* Double check the unit (should never get here with an invalid
381 * unit unless this is an API call.)
382 */
383 if (unit != 1 && unit != 2)
384 png_error(png_ptr, "Invalid sCAL unit");
385
386 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
387 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
388 png_error(png_ptr, "Invalid sCAL width");
389
390 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
391 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
392 png_error(png_ptr, "Invalid sCAL height");
393
394 info_ptr->scal_unit = (png_byte)unit;
395
396 ++lengthw;
397
398 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
399
400 info_ptr->scal_s_width = png_voidcast(png_charp,
401 png_malloc_warn(png_ptr, lengthw));
402
403 if (info_ptr->scal_s_width == NULL)
404 {
405 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
406
407 return;
408 }
409
410 memcpy(info_ptr->scal_s_width, swidth, lengthw);
411
412 ++lengthh;
413
414 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
415
416 info_ptr->scal_s_height = png_voidcast(png_charp,
417 png_malloc_warn(png_ptr, lengthh));
418
419 if (info_ptr->scal_s_height == NULL)
420 {
421 png_free (png_ptr, info_ptr->scal_s_width);
422 info_ptr->scal_s_width = NULL;
423
424 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
425
426 return;
427 }
428
429 memcpy(info_ptr->scal_s_height, sheight, lengthh);
430
431 info_ptr->valid |= PNG_INFO_sCAL;
432 info_ptr->free_me |= PNG_FREE_SCAL;
433 }
434
435 # ifdef PNG_FLOATING_POINT_SUPPORTED
436 void PNGAPI
png_set_sCAL(png_const_structrp png_ptr,png_inforp info_ptr,int unit,double width,double height)437 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
438 double width, double height)
439 {
440 png_debug1(1, "in %s storage function", "sCAL");
441
442 /* Check the arguments. */
443 if (width <= 0)
444 png_warning(png_ptr, "Invalid sCAL width ignored");
445
446 else if (height <= 0)
447 png_warning(png_ptr, "Invalid sCAL height ignored");
448
449 else
450 {
451 /* Convert 'width' and 'height' to ASCII. */
452 char swidth[PNG_sCAL_MAX_DIGITS+1];
453 char sheight[PNG_sCAL_MAX_DIGITS+1];
454
455 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
456 PNG_sCAL_PRECISION);
457 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
458 PNG_sCAL_PRECISION);
459
460 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
461 }
462 }
463 # endif
464
465 # ifdef PNG_FIXED_POINT_SUPPORTED
466 void PNGAPI
png_set_sCAL_fixed(png_const_structrp png_ptr,png_inforp info_ptr,int unit,png_fixed_point width,png_fixed_point height)467 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
468 png_fixed_point width, png_fixed_point height)
469 {
470 png_debug1(1, "in %s storage function", "sCAL");
471
472 /* Check the arguments. */
473 if (width <= 0)
474 png_warning(png_ptr, "Invalid sCAL width ignored");
475
476 else if (height <= 0)
477 png_warning(png_ptr, "Invalid sCAL height ignored");
478
479 else
480 {
481 /* Convert 'width' and 'height' to ASCII. */
482 char swidth[PNG_sCAL_MAX_DIGITS+1];
483 char sheight[PNG_sCAL_MAX_DIGITS+1];
484
485 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
486 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
487
488 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
489 }
490 }
491 # endif
492 #endif
493
494 #ifdef PNG_pHYs_SUPPORTED
495 void PNGAPI
png_set_pHYs(png_const_structrp png_ptr,png_inforp info_ptr,png_uint_32 res_x,png_uint_32 res_y,int unit_type)496 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
497 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
498 {
499 png_debug1(1, "in %s storage function", "pHYs");
500
501 if (png_ptr == NULL || info_ptr == NULL)
502 return;
503
504 info_ptr->x_pixels_per_unit = res_x;
505 info_ptr->y_pixels_per_unit = res_y;
506 info_ptr->phys_unit_type = (png_byte)unit_type;
507 info_ptr->valid |= PNG_INFO_pHYs;
508 }
509 #endif
510
511 void PNGAPI
png_set_PLTE(png_structrp png_ptr,png_inforp info_ptr,png_const_colorp palette,int num_palette)512 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
513 png_const_colorp palette, int num_palette)
514 {
515
516 png_uint_32 max_palette_length;
517
518 png_debug1(1, "in %s storage function", "PLTE");
519
520 if (png_ptr == NULL || info_ptr == NULL)
521 return;
522
523 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
524 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
525
526 if (num_palette < 0 || num_palette > (int) max_palette_length)
527 {
528 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
529 png_error(png_ptr, "Invalid palette length");
530
531 else
532 {
533 png_warning(png_ptr, "Invalid palette length");
534
535 return;
536 }
537 }
538
539 if ((num_palette > 0 && palette == NULL) ||
540 (num_palette == 0
541 # ifdef PNG_MNG_FEATURES_SUPPORTED
542 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
543 # endif
544 ))
545 {
546 png_error(png_ptr, "Invalid palette");
547 }
548
549 /* It may not actually be necessary to set png_ptr->palette here;
550 * we do it for backward compatibility with the way the png_handle_tRNS
551 * function used to do the allocation.
552 *
553 * 1.6.0: the above statement appears to be incorrect; something has to set
554 * the palette inside png_struct on read.
555 */
556 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
557
558 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
559 * of num_palette entries, in case of an invalid PNG file or incorrect
560 * call to png_set_PLTE() with too-large sample values.
561 */
562 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
563 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
564
565 if (num_palette > 0)
566 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
567 info_ptr->palette = png_ptr->palette;
568 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
569
570 info_ptr->free_me |= PNG_FREE_PLTE;
571
572 info_ptr->valid |= PNG_INFO_PLTE;
573 }
574
575 #ifdef PNG_sBIT_SUPPORTED
576 void PNGAPI
png_set_sBIT(png_const_structrp png_ptr,png_inforp info_ptr,png_const_color_8p sig_bit)577 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
578 png_const_color_8p sig_bit)
579 {
580 png_debug1(1, "in %s storage function", "sBIT");
581
582 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
583 return;
584
585 info_ptr->sig_bit = *sig_bit;
586 info_ptr->valid |= PNG_INFO_sBIT;
587 }
588 #endif
589
590 #ifdef PNG_sRGB_SUPPORTED
591 void PNGAPI
png_set_sRGB(png_const_structrp png_ptr,png_inforp info_ptr,int srgb_intent)592 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
593 {
594 png_debug1(1, "in %s storage function", "sRGB");
595
596 if (png_ptr == NULL || info_ptr == NULL)
597 return;
598
599 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
600 png_colorspace_sync_info(png_ptr, info_ptr);
601 }
602
603 void PNGAPI
png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr,png_inforp info_ptr,int srgb_intent)604 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
605 int srgb_intent)
606 {
607 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
608
609 if (png_ptr == NULL || info_ptr == NULL)
610 return;
611
612 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
613 srgb_intent) != 0)
614 {
615 /* This causes the gAMA and cHRM to be written too */
616 info_ptr->colorspace.flags |=
617 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
618 }
619
620 png_colorspace_sync_info(png_ptr, info_ptr);
621 }
622 #endif /* sRGB */
623
624
625 #ifdef PNG_iCCP_SUPPORTED
626 void PNGAPI
png_set_iCCP(png_const_structrp png_ptr,png_inforp info_ptr,png_const_charp name,int compression_type,png_const_bytep profile,png_uint_32 proflen)627 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
628 png_const_charp name, int compression_type,
629 png_const_bytep profile, png_uint_32 proflen)
630 {
631 png_charp new_iccp_name;
632 png_bytep new_iccp_profile;
633 png_size_t length;
634
635 png_debug1(1, "in %s storage function", "iCCP");
636
637 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
638 return;
639
640 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
641 png_app_error(png_ptr, "Invalid iCCP compression method");
642
643 /* Set the colorspace first because this validates the profile; do not
644 * override previously set app cHRM or gAMA here (because likely as not the
645 * application knows better than libpng what the correct values are.) Pass
646 * the info_ptr color_type field to png_colorspace_set_ICC because in the
647 * write case it has not yet been stored in png_ptr.
648 */
649 {
650 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
651 proflen, profile, info_ptr->color_type);
652
653 png_colorspace_sync_info(png_ptr, info_ptr);
654
655 /* Don't do any of the copying if the profile was bad, or inconsistent. */
656 if (result == 0)
657 return;
658
659 /* But do write the gAMA and cHRM chunks from the profile. */
660 info_ptr->colorspace.flags |=
661 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
662 }
663
664 length = strlen(name)+1;
665 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
666
667 if (new_iccp_name == NULL)
668 {
669 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
670
671 return;
672 }
673
674 memcpy(new_iccp_name, name, length);
675 new_iccp_profile = png_voidcast(png_bytep,
676 png_malloc_warn(png_ptr, proflen));
677
678 if (new_iccp_profile == NULL)
679 {
680 png_free(png_ptr, new_iccp_name);
681 png_benign_error(png_ptr,
682 "Insufficient memory to process iCCP profile");
683
684 return;
685 }
686
687 memcpy(new_iccp_profile, profile, proflen);
688
689 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
690
691 info_ptr->iccp_proflen = proflen;
692 info_ptr->iccp_name = new_iccp_name;
693 info_ptr->iccp_profile = new_iccp_profile;
694 info_ptr->free_me |= PNG_FREE_ICCP;
695 info_ptr->valid |= PNG_INFO_iCCP;
696 }
697 #endif
698
699 #ifdef PNG_TEXT_SUPPORTED
700 void PNGAPI
png_set_text(png_const_structrp png_ptr,png_inforp info_ptr,png_const_textp text_ptr,int num_text)701 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
702 png_const_textp text_ptr, int num_text)
703 {
704 int ret;
705 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
706
707 if (ret != 0)
708 png_error(png_ptr, "Insufficient memory to store text");
709 }
710
711 int /* PRIVATE */
png_set_text_2(png_const_structrp png_ptr,png_inforp info_ptr,png_const_textp text_ptr,int num_text)712 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
713 png_const_textp text_ptr, int num_text)
714 {
715 int i;
716
717 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
718 (unsigned long)png_ptr->chunk_name);
719
720 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
721 return(0);
722
723 /* Make sure we have enough space in the "text" array in info_struct
724 * to hold all of the incoming text_ptr objects. This compare can't overflow
725 * because max_text >= num_text (anyway, subtract of two positive integers
726 * can't overflow in any case.)
727 */
728 if (num_text > info_ptr->max_text - info_ptr->num_text)
729 {
730 int old_num_text = info_ptr->num_text;
731 int max_text;
732 png_textp new_text = NULL;
733
734 /* Calculate an appropriate max_text, checking for overflow. */
735 max_text = old_num_text;
736 if (num_text <= INT_MAX - max_text)
737 {
738 max_text += num_text;
739
740 /* Round up to a multiple of 8 */
741 if (max_text < INT_MAX-8)
742 max_text = (max_text + 8) & ~0x7;
743
744 else
745 max_text = INT_MAX;
746
747 /* Now allocate a new array and copy the old members in; this does all
748 * the overflow checks.
749 */
750 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
751 info_ptr->text, old_num_text, max_text-old_num_text,
752 sizeof *new_text));
753 }
754
755 if (new_text == NULL)
756 {
757 png_chunk_report(png_ptr, "too many text chunks",
758 PNG_CHUNK_WRITE_ERROR);
759
760 return 1;
761 }
762
763 png_free(png_ptr, info_ptr->text);
764
765 info_ptr->text = new_text;
766 info_ptr->free_me |= PNG_FREE_TEXT;
767 info_ptr->max_text = max_text;
768 /* num_text is adjusted below as the entries are copied in */
769
770 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
771 }
772
773 for (i = 0; i < num_text; i++)
774 {
775 size_t text_length, key_len;
776 size_t lang_len, lang_key_len;
777 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
778
779 if (text_ptr[i].key == NULL)
780 continue;
781
782 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
783 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
784 {
785 png_chunk_report(png_ptr, "text compression mode is out of range",
786 PNG_CHUNK_WRITE_ERROR);
787 continue;
788 }
789
790 key_len = strlen(text_ptr[i].key);
791
792 if (text_ptr[i].compression <= 0)
793 {
794 lang_len = 0;
795 lang_key_len = 0;
796 }
797
798 else
799 # ifdef PNG_iTXt_SUPPORTED
800 {
801 /* Set iTXt data */
802
803 if (text_ptr[i].lang != NULL)
804 lang_len = strlen(text_ptr[i].lang);
805
806 else
807 lang_len = 0;
808
809 if (text_ptr[i].lang_key != NULL)
810 lang_key_len = strlen(text_ptr[i].lang_key);
811
812 else
813 lang_key_len = 0;
814 }
815 # else /* iTXt */
816 {
817 png_chunk_report(png_ptr, "iTXt chunk not supported",
818 PNG_CHUNK_WRITE_ERROR);
819 continue;
820 }
821 # endif
822
823 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
824 {
825 text_length = 0;
826 # ifdef PNG_iTXt_SUPPORTED
827 if (text_ptr[i].compression > 0)
828 textp->compression = PNG_ITXT_COMPRESSION_NONE;
829
830 else
831 # endif
832 textp->compression = PNG_TEXT_COMPRESSION_NONE;
833 }
834
835 else
836 {
837 text_length = strlen(text_ptr[i].text);
838 textp->compression = text_ptr[i].compression;
839 }
840
841 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
842 key_len + text_length + lang_len + lang_key_len + 4));
843
844 if (textp->key == NULL)
845 {
846 png_chunk_report(png_ptr, "text chunk: out of memory",
847 PNG_CHUNK_WRITE_ERROR);
848
849 return 1;
850 }
851
852 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
853 (unsigned long)(png_uint_32)
854 (key_len + lang_len + lang_key_len + text_length + 4),
855 textp->key);
856
857 memcpy(textp->key, text_ptr[i].key, key_len);
858 *(textp->key + key_len) = '\0';
859
860 if (text_ptr[i].compression > 0)
861 {
862 textp->lang = textp->key + key_len + 1;
863 memcpy(textp->lang, text_ptr[i].lang, lang_len);
864 *(textp->lang + lang_len) = '\0';
865 textp->lang_key = textp->lang + lang_len + 1;
866 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
867 *(textp->lang_key + lang_key_len) = '\0';
868 textp->text = textp->lang_key + lang_key_len + 1;
869 }
870
871 else
872 {
873 textp->lang=NULL;
874 textp->lang_key=NULL;
875 textp->text = textp->key + key_len + 1;
876 }
877
878 if (text_length != 0)
879 memcpy(textp->text, text_ptr[i].text, text_length);
880
881 *(textp->text + text_length) = '\0';
882
883 # ifdef PNG_iTXt_SUPPORTED
884 if (textp->compression > 0)
885 {
886 textp->text_length = 0;
887 textp->itxt_length = text_length;
888 }
889
890 else
891 # endif
892 {
893 textp->text_length = text_length;
894 textp->itxt_length = 0;
895 }
896
897 info_ptr->num_text++;
898 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
899 }
900
901 return(0);
902 }
903 #endif
904
905 #ifdef PNG_tIME_SUPPORTED
906 void PNGAPI
png_set_tIME(png_const_structrp png_ptr,png_inforp info_ptr,png_const_timep mod_time)907 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
908 png_const_timep mod_time)
909 {
910 png_debug1(1, "in %s storage function", "tIME");
911
912 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
913 (png_ptr->mode & PNG_WROTE_tIME) != 0)
914 return;
915
916 if (mod_time->month == 0 || mod_time->month > 12 ||
917 mod_time->day == 0 || mod_time->day > 31 ||
918 mod_time->hour > 23 || mod_time->minute > 59 ||
919 mod_time->second > 60)
920 {
921 png_warning(png_ptr, "Ignoring invalid time value");
922
923 return;
924 }
925
926 info_ptr->mod_time = *mod_time;
927 info_ptr->valid |= PNG_INFO_tIME;
928 }
929 #endif
930
931 #ifdef PNG_tRNS_SUPPORTED
932 void PNGAPI
png_set_tRNS(png_structrp png_ptr,png_inforp info_ptr,png_const_bytep trans_alpha,int num_trans,png_const_color_16p trans_color)933 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
934 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
935 {
936 png_debug1(1, "in %s storage function", "tRNS");
937
938 if (png_ptr == NULL || info_ptr == NULL)
939
940 return;
941
942 if (trans_alpha != NULL)
943 {
944 /* It may not actually be necessary to set png_ptr->trans_alpha here;
945 * we do it for backward compatibility with the way the png_handle_tRNS
946 * function used to do the allocation.
947 *
948 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
949 * relies on png_set_tRNS storing the information in png_struct
950 * (otherwise it won't be there for the code in pngrtran.c).
951 */
952
953 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
954
955 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
956 {
957 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
958 info_ptr->trans_alpha = png_voidcast(png_bytep,
959 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
960 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
961 }
962 png_ptr->trans_alpha = info_ptr->trans_alpha;
963 }
964
965 if (trans_color != NULL)
966 {
967 #ifdef PNG_WARNINGS_SUPPORTED
968 if (info_ptr->bit_depth < 16)
969 {
970 int sample_max = (1 << info_ptr->bit_depth) - 1;
971
972 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
973 trans_color->gray > sample_max) ||
974 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
975 (trans_color->red > sample_max ||
976 trans_color->green > sample_max ||
977 trans_color->blue > sample_max)))
978 png_warning(png_ptr,
979 "tRNS chunk has out-of-range samples for bit_depth");
980 }
981 #endif
982
983 info_ptr->trans_color = *trans_color;
984
985 if (num_trans == 0)
986 num_trans = 1;
987 }
988
989 info_ptr->num_trans = (png_uint_16)num_trans;
990
991 if (num_trans != 0)
992 {
993 info_ptr->valid |= PNG_INFO_tRNS;
994 info_ptr->free_me |= PNG_FREE_TRNS;
995 }
996 }
997 #endif
998
999 #ifdef PNG_sPLT_SUPPORTED
1000 void PNGAPI
png_set_sPLT(png_const_structrp png_ptr,png_inforp info_ptr,png_const_sPLT_tp entries,int nentries)1001 png_set_sPLT(png_const_structrp png_ptr,
1002 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1003 /*
1004 * entries - array of png_sPLT_t structures
1005 * to be added to the list of palettes
1006 * in the info structure.
1007 *
1008 * nentries - number of palette structures to be
1009 * added.
1010 */
1011 {
1012 png_sPLT_tp np;
1013
1014 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1015 return;
1016
1017 /* Use the internal realloc function, which checks for all the possible
1018 * overflows. Notice that the parameters are (int) and (size_t)
1019 */
1020 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1021 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1022 sizeof *np));
1023
1024 if (np == NULL)
1025 {
1026 /* Out of memory or too many chunks */
1027 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1028
1029 return;
1030 }
1031
1032 png_free(png_ptr, info_ptr->splt_palettes);
1033 info_ptr->splt_palettes = np;
1034 info_ptr->free_me |= PNG_FREE_SPLT;
1035
1036 np += info_ptr->splt_palettes_num;
1037
1038 do
1039 {
1040 png_size_t length;
1041
1042 /* Skip invalid input entries */
1043 if (entries->name == NULL || entries->entries == NULL)
1044 {
1045 /* png_handle_sPLT doesn't do this, so this is an app error */
1046 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1047 /* Just skip the invalid entry */
1048 continue;
1049 }
1050
1051 np->depth = entries->depth;
1052
1053 /* In the event of out-of-memory just return - there's no point keeping
1054 * on trying to add sPLT chunks.
1055 */
1056 length = strlen(entries->name) + 1;
1057 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1058
1059 if (np->name == NULL)
1060 break;
1061
1062 memcpy(np->name, entries->name, length);
1063
1064 /* IMPORTANT: we have memory now that won't get freed if something else
1065 * goes wrong; this code must free it. png_malloc_array produces no
1066 * warnings; use a png_chunk_report (below) if there is an error.
1067 */
1068 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1069 entries->nentries, sizeof (png_sPLT_entry)));
1070
1071 if (np->entries == NULL)
1072 {
1073 png_free(png_ptr, np->name);
1074 np->name = NULL;
1075 break;
1076 }
1077
1078 np->nentries = entries->nentries;
1079 /* This multiply can't overflow because png_malloc_array has already
1080 * checked it when doing the allocation.
1081 */
1082 memcpy(np->entries, entries->entries,
1083 entries->nentries * sizeof (png_sPLT_entry));
1084
1085 /* Note that 'continue' skips the advance of the out pointer and out
1086 * count, so an invalid entry is not added.
1087 */
1088 info_ptr->valid |= PNG_INFO_sPLT;
1089 ++(info_ptr->splt_palettes_num);
1090 ++np;
1091 }
1092 while (++entries, --nentries);
1093
1094 if (nentries > 0)
1095 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1096 }
1097 #endif /* sPLT */
1098
1099 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1100 static png_byte
check_location(png_const_structrp png_ptr,int location)1101 check_location(png_const_structrp png_ptr, int location)
1102 {
1103 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1104
1105 /* New in 1.6.0; copy the location and check it. This is an API
1106 * change; previously the app had to use the
1107 * png_set_unknown_chunk_location API below for each chunk.
1108 */
1109 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1110 {
1111 /* Write struct, so unknown chunks come from the app */
1112 png_app_warning(png_ptr,
1113 "png_set_unknown_chunks now expects a valid location");
1114 /* Use the old behavior */
1115 location = (png_byte)(png_ptr->mode &
1116 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1117 }
1118
1119 /* This need not be an internal error - if the app calls
1120 * png_set_unknown_chunks on a read pointer it must get the location right.
1121 */
1122 if (location == 0)
1123 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1124
1125 /* Now reduce the location to the top-most set bit by removing each least
1126 * significant bit in turn.
1127 */
1128 while (location != (location & -location))
1129 location &= ~(location & -location);
1130
1131 /* The cast is safe because 'location' is a bit mask and only the low four
1132 * bits are significant.
1133 */
1134 return (png_byte)location;
1135 }
1136
1137 void PNGAPI
png_set_unknown_chunks(png_const_structrp png_ptr,png_inforp info_ptr,png_const_unknown_chunkp unknowns,int num_unknowns)1138 png_set_unknown_chunks(png_const_structrp png_ptr,
1139 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1140 {
1141 png_unknown_chunkp np;
1142
1143 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1144 unknowns == NULL)
1145 return;
1146
1147 /* Check for the failure cases where support has been disabled at compile
1148 * time. This code is hardly ever compiled - it's here because
1149 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1150 * code) but may be meaningless if the read or write handling of unknown
1151 * chunks is not compiled in.
1152 */
1153 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1154 defined(PNG_READ_SUPPORTED)
1155 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1156 {
1157 png_app_error(png_ptr, "no unknown chunk support on read");
1158
1159 return;
1160 }
1161 # endif
1162 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1163 defined(PNG_WRITE_SUPPORTED)
1164 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1165 {
1166 png_app_error(png_ptr, "no unknown chunk support on write");
1167
1168 return;
1169 }
1170 # endif
1171
1172 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1173 * unknown critical chunks could be lost with just a warning resulting in
1174 * undefined behavior. Now png_chunk_report is used to provide behavior
1175 * appropriate to read or write.
1176 */
1177 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1178 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1179 sizeof *np));
1180
1181 if (np == NULL)
1182 {
1183 png_chunk_report(png_ptr, "too many unknown chunks",
1184 PNG_CHUNK_WRITE_ERROR);
1185
1186 return;
1187 }
1188
1189 png_free(png_ptr, info_ptr->unknown_chunks);
1190 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1191 info_ptr->free_me |= PNG_FREE_UNKN;
1192
1193 np += info_ptr->unknown_chunks_num;
1194
1195 /* Increment unknown_chunks_num each time round the loop to protect the
1196 * just-allocated chunk data.
1197 */
1198 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1199 {
1200 memcpy(np->name, unknowns->name, (sizeof np->name));
1201 np->name[(sizeof np->name)-1] = '\0';
1202 np->location = check_location(png_ptr, unknowns->location);
1203
1204 if (unknowns->size == 0)
1205 {
1206 np->data = NULL;
1207 np->size = 0;
1208 }
1209
1210 else
1211 {
1212 np->data = png_voidcast(png_bytep,
1213 png_malloc_base(png_ptr, unknowns->size));
1214
1215 if (np->data == NULL)
1216 {
1217 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1218 PNG_CHUNK_WRITE_ERROR);
1219 /* But just skip storing the unknown chunk */
1220 continue;
1221 }
1222
1223 memcpy(np->data, unknowns->data, unknowns->size);
1224 np->size = unknowns->size;
1225 }
1226
1227 /* These increments are skipped on out-of-memory for the data - the
1228 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1229 * This is correct in the read case (the chunk is just dropped.)
1230 */
1231 ++np;
1232 ++(info_ptr->unknown_chunks_num);
1233 }
1234 }
1235
1236 void PNGAPI
png_set_unknown_chunk_location(png_const_structrp png_ptr,png_inforp info_ptr,int chunk,int location)1237 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1238 int chunk, int location)
1239 {
1240 /* This API is pretty pointless in 1.6.0 because the location can be set
1241 * before the call to png_set_unknown_chunks.
1242 *
1243 * TODO: add a png_app_warning in 1.7
1244 */
1245 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1246 chunk < info_ptr->unknown_chunks_num)
1247 {
1248 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1249 {
1250 png_app_error(png_ptr, "invalid unknown chunk location");
1251 /* Fake out the pre 1.6.0 behavior: */
1252 if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1253 location = PNG_AFTER_IDAT;
1254
1255 else
1256 location = PNG_HAVE_IHDR; /* also undocumented */
1257 }
1258
1259 info_ptr->unknown_chunks[chunk].location =
1260 check_location(png_ptr, location);
1261 }
1262 }
1263 #endif /* STORE_UNKNOWN_CHUNKS */
1264
1265 #ifdef PNG_MNG_FEATURES_SUPPORTED
1266 png_uint_32 PNGAPI
png_permit_mng_features(png_structrp png_ptr,png_uint_32 mng_features)1267 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1268 {
1269 png_debug(1, "in png_permit_mng_features");
1270
1271 if (png_ptr == NULL)
1272 return 0;
1273
1274 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1275
1276 return png_ptr->mng_features_permitted;
1277 }
1278 #endif
1279
1280 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1281 static unsigned int
add_one_chunk(png_bytep list,unsigned int count,png_const_bytep add,int keep)1282 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1283 {
1284 unsigned int i;
1285
1286 /* Utility function: update the 'keep' state of a chunk if it is already in
1287 * the list, otherwise add it to the list.
1288 */
1289 for (i=0; i<count; ++i, list += 5)
1290 {
1291 if (memcmp(list, add, 4) == 0)
1292 {
1293 list[4] = (png_byte)keep;
1294
1295 return count;
1296 }
1297 }
1298
1299 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1300 {
1301 ++count;
1302 memcpy(list, add, 4);
1303 list[4] = (png_byte)keep;
1304 }
1305
1306 return count;
1307 }
1308
1309 void PNGAPI
png_set_keep_unknown_chunks(png_structrp png_ptr,int keep,png_const_bytep chunk_list,int num_chunks_in)1310 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1311 png_const_bytep chunk_list, int num_chunks_in)
1312 {
1313 png_bytep new_list;
1314 unsigned int num_chunks, old_num_chunks;
1315
1316 if (png_ptr == NULL)
1317 return;
1318
1319 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1320 {
1321 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1322
1323 return;
1324 }
1325
1326 if (num_chunks_in <= 0)
1327 {
1328 png_ptr->unknown_default = keep;
1329
1330 /* '0' means just set the flags, so stop here */
1331 if (num_chunks_in == 0)
1332 return;
1333 }
1334
1335 if (num_chunks_in < 0)
1336 {
1337 /* Ignore all unknown chunks and all chunks recognized by
1338 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1339 */
1340 static PNG_CONST png_byte chunks_to_ignore[] = {
1341 98, 75, 71, 68, '\0', /* bKGD */
1342 99, 72, 82, 77, '\0', /* cHRM */
1343 103, 65, 77, 65, '\0', /* gAMA */
1344 104, 73, 83, 84, '\0', /* hIST */
1345 105, 67, 67, 80, '\0', /* iCCP */
1346 105, 84, 88, 116, '\0', /* iTXt */
1347 111, 70, 70, 115, '\0', /* oFFs */
1348 112, 67, 65, 76, '\0', /* pCAL */
1349 112, 72, 89, 115, '\0', /* pHYs */
1350 115, 66, 73, 84, '\0', /* sBIT */
1351 115, 67, 65, 76, '\0', /* sCAL */
1352 115, 80, 76, 84, '\0', /* sPLT */
1353 115, 84, 69, 82, '\0', /* sTER */
1354 115, 82, 71, 66, '\0', /* sRGB */
1355 116, 69, 88, 116, '\0', /* tEXt */
1356 116, 73, 77, 69, '\0', /* tIME */
1357 122, 84, 88, 116, '\0' /* zTXt */
1358 };
1359
1360 chunk_list = chunks_to_ignore;
1361 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1362 }
1363
1364 else /* num_chunks_in > 0 */
1365 {
1366 if (chunk_list == NULL)
1367 {
1368 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1369 * which can be switched off.
1370 */
1371 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1372
1373 return;
1374 }
1375
1376 num_chunks = num_chunks_in;
1377 }
1378
1379 old_num_chunks = png_ptr->num_chunk_list;
1380 if (png_ptr->chunk_list == NULL)
1381 old_num_chunks = 0;
1382
1383 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1384 */
1385 if (num_chunks + old_num_chunks > UINT_MAX/5)
1386 {
1387 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1388
1389 return;
1390 }
1391
1392 /* If these chunks are being reset to the default then no more memory is
1393 * required because add_one_chunk above doesn't extend the list if the 'keep'
1394 * parameter is the default.
1395 */
1396 if (keep != 0)
1397 {
1398 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1399 5 * (num_chunks + old_num_chunks)));
1400
1401 if (old_num_chunks > 0)
1402 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1403 }
1404
1405 else if (old_num_chunks > 0)
1406 new_list = png_ptr->chunk_list;
1407
1408 else
1409 new_list = NULL;
1410
1411 /* Add the new chunks together with each one's handling code. If the chunk
1412 * already exists the code is updated, otherwise the chunk is added to the
1413 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1414 * the earlier convention that the last setting is the one that is used.)
1415 */
1416 if (new_list != NULL)
1417 {
1418 png_const_bytep inlist;
1419 png_bytep outlist;
1420 unsigned int i;
1421
1422 for (i=0; i<num_chunks; ++i)
1423 {
1424 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1425 chunk_list+5*i, keep);
1426 }
1427
1428 /* Now remove any spurious 'default' entries. */
1429 num_chunks = 0;
1430 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1431 {
1432 if (inlist[4])
1433 {
1434 if (outlist != inlist)
1435 memcpy(outlist, inlist, 5);
1436 outlist += 5;
1437 ++num_chunks;
1438 }
1439 }
1440
1441 /* This means the application has removed all the specialized handling. */
1442 if (num_chunks == 0)
1443 {
1444 if (png_ptr->chunk_list != new_list)
1445 png_free(png_ptr, new_list);
1446
1447 new_list = NULL;
1448 }
1449 }
1450
1451 else
1452 num_chunks = 0;
1453
1454 png_ptr->num_chunk_list = num_chunks;
1455
1456 if (png_ptr->chunk_list != new_list)
1457 {
1458 if (png_ptr->chunk_list != NULL)
1459 png_free(png_ptr, png_ptr->chunk_list);
1460
1461 png_ptr->chunk_list = new_list;
1462 }
1463 }
1464 #endif
1465
1466 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1467 void PNGAPI
png_set_read_user_chunk_fn(png_structrp png_ptr,png_voidp user_chunk_ptr,png_user_chunk_ptr read_user_chunk_fn)1468 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1469 png_user_chunk_ptr read_user_chunk_fn)
1470 {
1471 png_debug(1, "in png_set_read_user_chunk_fn");
1472
1473 if (png_ptr == NULL)
1474 return;
1475
1476 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1477 png_ptr->user_chunk_ptr = user_chunk_ptr;
1478 }
1479 #endif
1480
1481 #ifdef PNG_INFO_IMAGE_SUPPORTED
1482 void PNGAPI
png_set_rows(png_const_structrp png_ptr,png_inforp info_ptr,png_bytepp row_pointers)1483 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1484 png_bytepp row_pointers)
1485 {
1486 png_debug1(1, "in %s storage function", "rows");
1487
1488 if (png_ptr == NULL || info_ptr == NULL)
1489 return;
1490
1491 if (info_ptr->row_pointers != NULL &&
1492 (info_ptr->row_pointers != row_pointers))
1493 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1494
1495 info_ptr->row_pointers = row_pointers;
1496
1497 if (row_pointers != NULL)
1498 info_ptr->valid |= PNG_INFO_IDAT;
1499 }
1500 #endif
1501
1502 void PNGAPI
png_set_compression_buffer_size(png_structrp png_ptr,png_size_t size)1503 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
1504 {
1505 if (png_ptr == NULL)
1506 return;
1507
1508 if (size == 0 || size > PNG_UINT_31_MAX)
1509 png_error(png_ptr, "invalid compression buffer size");
1510
1511 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1512 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1513 {
1514 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1515 return;
1516 }
1517 # endif
1518
1519 # ifdef PNG_WRITE_SUPPORTED
1520 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1521 {
1522 if (png_ptr->zowner != 0)
1523 {
1524 png_warning(png_ptr,
1525 "Compression buffer size cannot be changed because it is in use");
1526
1527 return;
1528 }
1529
1530 #ifndef __COVERITY__
1531 /* Some compilers complain that this is always false. However, it
1532 * can be true when integer overflow happens.
1533 */
1534 if (size > ZLIB_IO_MAX)
1535 {
1536 png_warning(png_ptr,
1537 "Compression buffer size limited to system maximum");
1538 size = ZLIB_IO_MAX; /* must fit */
1539 }
1540 #endif
1541
1542 if (size < 6)
1543 {
1544 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1545 * if this is permitted.
1546 */
1547 png_warning(png_ptr,
1548 "Compression buffer size cannot be reduced below 6");
1549
1550 return;
1551 }
1552
1553 if (png_ptr->zbuffer_size != size)
1554 {
1555 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1556 png_ptr->zbuffer_size = (uInt)size;
1557 }
1558 }
1559 # endif
1560 }
1561
1562 void PNGAPI
png_set_invalid(png_const_structrp png_ptr,png_inforp info_ptr,int mask)1563 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1564 {
1565 if (png_ptr != NULL && info_ptr != NULL)
1566 info_ptr->valid &= ~mask;
1567 }
1568
1569
1570 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1571 /* This function was added to libpng 1.2.6 */
1572 void PNGAPI
png_set_user_limits(png_structrp png_ptr,png_uint_32 user_width_max,png_uint_32 user_height_max)1573 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1574 png_uint_32 user_height_max)
1575 {
1576 /* Images with dimensions larger than these limits will be
1577 * rejected by png_set_IHDR(). To accept any PNG datastream
1578 * regardless of dimensions, set both limits to 0x7fffffff.
1579 */
1580 if (png_ptr == NULL)
1581 return;
1582
1583 png_ptr->user_width_max = user_width_max;
1584 png_ptr->user_height_max = user_height_max;
1585 }
1586
1587 /* This function was added to libpng 1.4.0 */
1588 void PNGAPI
png_set_chunk_cache_max(png_structrp png_ptr,png_uint_32 user_chunk_cache_max)1589 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1590 {
1591 if (png_ptr != NULL)
1592 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1593 }
1594
1595 /* This function was added to libpng 1.4.1 */
1596 void PNGAPI
png_set_chunk_malloc_max(png_structrp png_ptr,png_alloc_size_t user_chunk_malloc_max)1597 png_set_chunk_malloc_max (png_structrp png_ptr,
1598 png_alloc_size_t user_chunk_malloc_max)
1599 {
1600 if (png_ptr != NULL)
1601 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1602 }
1603 #endif /* ?SET_USER_LIMITS */
1604
1605
1606 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1607 void PNGAPI
png_set_benign_errors(png_structrp png_ptr,int allowed)1608 png_set_benign_errors(png_structrp png_ptr, int allowed)
1609 {
1610 png_debug(1, "in png_set_benign_errors");
1611
1612 /* If allowed is 1, png_benign_error() is treated as a warning.
1613 *
1614 * If allowed is 0, png_benign_error() is treated as an error (which
1615 * is the default behavior if png_set_benign_errors() is not called).
1616 */
1617
1618 if (allowed != 0)
1619 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1620 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1621
1622 else
1623 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1624 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1625 }
1626 #endif /* BENIGN_ERRORS */
1627
1628 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1629 /* Whether to report invalid palette index; added at libng-1.5.10.
1630 * It is possible for an indexed (color-type==3) PNG file to contain
1631 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1632 * fewer entries than the image's bit-depth would allow. We recover
1633 * from this gracefully by filling any incomplete palette with zeros
1634 * (opaque black). By default, when this occurs libpng will issue
1635 * a benign error. This API can be used to override that behavior.
1636 */
1637 void PNGAPI
png_set_check_for_invalid_index(png_structrp png_ptr,int allowed)1638 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1639 {
1640 png_debug(1, "in png_set_check_for_invalid_index");
1641
1642 if (allowed > 0)
1643 png_ptr->num_palette_max = 0;
1644
1645 else
1646 png_ptr->num_palette_max = -1;
1647 }
1648 #endif
1649
1650 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1651 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1652 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1653 * and if invalid, correct the keyword rather than discarding the entire
1654 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1655 * length, forbids leading or trailing whitespace, multiple internal spaces,
1656 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1657 *
1658 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1659 * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1660 * valid one could not be generated, and the caller must png_error.
1661 */
1662 png_uint_32 /* PRIVATE */
png_check_keyword(png_structrp png_ptr,png_const_charp key,png_bytep new_key)1663 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1664 {
1665 #ifdef PNG_WARNINGS_SUPPORTED
1666 png_const_charp orig_key = key;
1667 #endif
1668 png_uint_32 key_len = 0;
1669 int bad_character = 0;
1670 int space = 1;
1671
1672 png_debug(1, "in png_check_keyword");
1673
1674 if (key == NULL)
1675 {
1676 *new_key = 0;
1677 return 0;
1678 }
1679
1680 while (*key && key_len < 79)
1681 {
1682 png_byte ch = (png_byte)*key++;
1683
1684 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1685 *new_key++ = ch, ++key_len, space = 0;
1686
1687 else if (space == 0)
1688 {
1689 /* A space or an invalid character when one wasn't seen immediately
1690 * before; output just a space.
1691 */
1692 *new_key++ = 32, ++key_len, space = 1;
1693
1694 /* If the character was not a space then it is invalid. */
1695 if (ch != 32)
1696 bad_character = ch;
1697 }
1698
1699 else if (bad_character == 0)
1700 bad_character = ch; /* just skip it, record the first error */
1701 }
1702
1703 if (key_len > 0 && space != 0) /* trailing space */
1704 {
1705 --key_len, --new_key;
1706 if (bad_character == 0)
1707 bad_character = 32;
1708 }
1709
1710 /* Terminate the keyword */
1711 *new_key = 0;
1712
1713 if (key_len == 0)
1714 return 0;
1715
1716 #ifdef PNG_WARNINGS_SUPPORTED
1717 /* Try to only output one warning per keyword: */
1718 if (*key != 0) /* keyword too long */
1719 png_warning(png_ptr, "keyword truncated");
1720
1721 else if (bad_character != 0)
1722 {
1723 PNG_WARNING_PARAMETERS(p)
1724
1725 png_warning_parameter(p, 1, orig_key);
1726 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1727
1728 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1729 }
1730 #else /* !WARNINGS */
1731 PNG_UNUSED(png_ptr)
1732 #endif /* !WARNINGS */
1733
1734 return key_len;
1735 }
1736 #endif /* TEXT || pCAL || iCCP || sPLT */
1737 #endif /* READ || WRITE */
1738