1
2 /* pngset.c - storage of image information into info struct
3 *
4 * Copyright (c) 2018-2022 Cosmin Truta
5 * Copyright (c) 1998-2018 Glenn Randers-Pehrson
6 * Copyright (c) 1996-1997 Andreas Dilger
7 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 *
13 * The functions here are used during reads to store data from the file
14 * into the info struct, and during writes to store application data
15 * into the info struct for writing into the file. This abstracts the
16 * info struct and allows us to change the structure in the future.
17 */
18
19 #include "pngpriv.h"
20
21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
22
23 #ifdef PNG_bKGD_SUPPORTED
24 void PNGAPI
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_eXIf_SUPPORTED
138 void PNGAPI
png_set_eXIf(png_const_structrp png_ptr,png_inforp info_ptr,png_bytep eXIf_buf)139 png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
140 png_bytep eXIf_buf)
141 {
142 png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
143 PNG_UNUSED(info_ptr)
144 PNG_UNUSED(eXIf_buf)
145 }
146
147 void PNGAPI
png_set_eXIf_1(png_const_structrp png_ptr,png_inforp info_ptr,png_uint_32 num_exif,png_bytep eXIf_buf)148 png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
149 png_uint_32 num_exif, png_bytep eXIf_buf)
150 {
151 int i;
152
153 png_debug1(1, "in %s storage function", "eXIf");
154
155 if (png_ptr == NULL || info_ptr == NULL)
156 return;
157
158 if (info_ptr->exif)
159 {
160 png_free(png_ptr, info_ptr->exif);
161 info_ptr->exif = NULL;
162 }
163
164 info_ptr->num_exif = num_exif;
165
166 info_ptr->exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr,
167 info_ptr->num_exif));
168
169 if (info_ptr->exif == NULL)
170 {
171 png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
172 return;
173 }
174
175 info_ptr->free_me |= PNG_FREE_EXIF;
176
177 for (i = 0; i < (int) info_ptr->num_exif; i++)
178 info_ptr->exif[i] = eXIf_buf[i];
179
180 info_ptr->valid |= PNG_INFO_eXIf;
181 }
182 #endif /* eXIf */
183
184 #ifdef PNG_gAMA_SUPPORTED
185 void PNGFAPI
png_set_gAMA_fixed(png_const_structrp png_ptr,png_inforp info_ptr,png_fixed_point file_gamma)186 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
187 png_fixed_point file_gamma)
188 {
189 png_debug1(1, "in %s storage function", "gAMA");
190
191 if (png_ptr == NULL || info_ptr == NULL)
192 return;
193
194 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
195 png_colorspace_sync_info(png_ptr, info_ptr);
196 }
197
198 # ifdef PNG_FLOATING_POINT_SUPPORTED
199 void PNGAPI
png_set_gAMA(png_const_structrp png_ptr,png_inforp info_ptr,double file_gamma)200 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
201 {
202 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
203 "png_set_gAMA"));
204 }
205 # endif
206 #endif
207
208 #ifdef PNG_hIST_SUPPORTED
209 void PNGAPI
png_set_hIST(png_const_structrp png_ptr,png_inforp info_ptr,png_const_uint_16p hist)210 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
211 png_const_uint_16p hist)
212 {
213 int i;
214
215 png_debug1(1, "in %s storage function", "hIST");
216
217 if (png_ptr == NULL || info_ptr == NULL)
218 return;
219
220 if (info_ptr->num_palette == 0 || info_ptr->num_palette
221 > PNG_MAX_PALETTE_LENGTH)
222 {
223 png_warning(png_ptr,
224 "Invalid palette size, hIST allocation skipped");
225
226 return;
227 }
228
229 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
230
231 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
232 * version 1.2.1
233 */
234 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
235 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
236
237 if (info_ptr->hist == NULL)
238 {
239 png_warning(png_ptr, "Insufficient memory for hIST chunk data");
240
241 return;
242 }
243
244 info_ptr->free_me |= PNG_FREE_HIST;
245
246 for (i = 0; i < info_ptr->num_palette; i++)
247 info_ptr->hist[i] = hist[i];
248
249 info_ptr->valid |= PNG_INFO_hIST;
250 }
251 #endif
252
253 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)254 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
255 png_uint_32 width, png_uint_32 height, int bit_depth,
256 int color_type, int interlace_type, int compression_type,
257 int filter_type)
258 {
259 png_debug1(1, "in %s storage function", "IHDR");
260
261 if (png_ptr == NULL || info_ptr == NULL)
262 return;
263
264 info_ptr->width = width;
265 info_ptr->height = height;
266 info_ptr->bit_depth = (png_byte)bit_depth;
267 info_ptr->color_type = (png_byte)color_type;
268 info_ptr->compression_type = (png_byte)compression_type;
269 info_ptr->filter_type = (png_byte)filter_type;
270 info_ptr->interlace_type = (png_byte)interlace_type;
271
272 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
273 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
274 info_ptr->compression_type, info_ptr->filter_type);
275
276 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
277 info_ptr->channels = 1;
278
279 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
280 info_ptr->channels = 3;
281
282 else
283 info_ptr->channels = 1;
284
285 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
286 info_ptr->channels++;
287
288 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
289
290 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
291 }
292
293 #ifdef PNG_oFFs_SUPPORTED
294 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)295 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
296 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
297 {
298 png_debug1(1, "in %s storage function", "oFFs");
299
300 if (png_ptr == NULL || info_ptr == NULL)
301 return;
302
303 info_ptr->x_offset = offset_x;
304 info_ptr->y_offset = offset_y;
305 info_ptr->offset_unit_type = (png_byte)unit_type;
306 info_ptr->valid |= PNG_INFO_oFFs;
307 }
308 #endif
309
310 #ifdef PNG_pCAL_SUPPORTED
311 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)312 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
313 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
314 int nparams, png_const_charp units, png_charpp params)
315 {
316 size_t length;
317 int i;
318
319 png_debug1(1, "in %s storage function", "pCAL");
320
321 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
322 || (nparams > 0 && params == NULL))
323 return;
324
325 length = strlen(purpose) + 1;
326 png_debug1(3, "allocating purpose for info (%lu bytes)",
327 (unsigned long)length);
328
329 /* TODO: validate format of calibration name and unit name */
330
331 /* Check that the type matches the specification. */
332 if (type < 0 || type > 3)
333 {
334 png_chunk_report(png_ptr, "Invalid pCAL equation type",
335 PNG_CHUNK_WRITE_ERROR);
336 return;
337 }
338
339 if (nparams < 0 || nparams > 255)
340 {
341 png_chunk_report(png_ptr, "Invalid pCAL parameter count",
342 PNG_CHUNK_WRITE_ERROR);
343 return;
344 }
345
346 /* Validate params[nparams] */
347 for (i=0; i<nparams; ++i)
348 {
349 if (params[i] == NULL ||
350 !png_check_fp_string(params[i], strlen(params[i])))
351 {
352 png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
353 PNG_CHUNK_WRITE_ERROR);
354 return;
355 }
356 }
357
358 info_ptr->pcal_purpose = png_voidcast(png_charp,
359 png_malloc_warn(png_ptr, length));
360
361 if (info_ptr->pcal_purpose == NULL)
362 {
363 png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
364 PNG_CHUNK_WRITE_ERROR);
365 return;
366 }
367
368 memcpy(info_ptr->pcal_purpose, purpose, length);
369
370 png_debug(3, "storing X0, X1, type, and nparams in info");
371 info_ptr->pcal_X0 = X0;
372 info_ptr->pcal_X1 = X1;
373 info_ptr->pcal_type = (png_byte)type;
374 info_ptr->pcal_nparams = (png_byte)nparams;
375
376 length = strlen(units) + 1;
377 png_debug1(3, "allocating units for info (%lu bytes)",
378 (unsigned long)length);
379
380 info_ptr->pcal_units = png_voidcast(png_charp,
381 png_malloc_warn(png_ptr, length));
382
383 if (info_ptr->pcal_units == NULL)
384 {
385 png_warning(png_ptr, "Insufficient memory for pCAL units");
386
387 return;
388 }
389
390 memcpy(info_ptr->pcal_units, units, length);
391
392 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
393 (size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
394
395 if (info_ptr->pcal_params == NULL)
396 {
397 png_warning(png_ptr, "Insufficient memory for pCAL params");
398
399 return;
400 }
401
402 memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
403 (sizeof (png_charp)));
404
405 for (i = 0; i < nparams; i++)
406 {
407 length = strlen(params[i]) + 1;
408 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
409 (unsigned long)length);
410
411 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
412
413 if (info_ptr->pcal_params[i] == NULL)
414 {
415 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
416
417 return;
418 }
419
420 memcpy(info_ptr->pcal_params[i], params[i], length);
421 }
422
423 info_ptr->valid |= PNG_INFO_pCAL;
424 info_ptr->free_me |= PNG_FREE_PCAL;
425 }
426 #endif
427
428 #ifdef PNG_sCAL_SUPPORTED
429 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)430 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
431 int unit, png_const_charp swidth, png_const_charp sheight)
432 {
433 size_t lengthw = 0, lengthh = 0;
434
435 png_debug1(1, "in %s storage function", "sCAL");
436
437 if (png_ptr == NULL || info_ptr == NULL)
438 return;
439
440 /* Double check the unit (should never get here with an invalid
441 * unit unless this is an API call.)
442 */
443 if (unit != 1 && unit != 2)
444 png_error(png_ptr, "Invalid sCAL unit");
445
446 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
447 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
448 png_error(png_ptr, "Invalid sCAL width");
449
450 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
451 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
452 png_error(png_ptr, "Invalid sCAL height");
453
454 info_ptr->scal_unit = (png_byte)unit;
455
456 ++lengthw;
457
458 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
459
460 info_ptr->scal_s_width = png_voidcast(png_charp,
461 png_malloc_warn(png_ptr, lengthw));
462
463 if (info_ptr->scal_s_width == NULL)
464 {
465 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
466
467 return;
468 }
469
470 memcpy(info_ptr->scal_s_width, swidth, lengthw);
471
472 ++lengthh;
473
474 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
475
476 info_ptr->scal_s_height = png_voidcast(png_charp,
477 png_malloc_warn(png_ptr, lengthh));
478
479 if (info_ptr->scal_s_height == NULL)
480 {
481 png_free (png_ptr, info_ptr->scal_s_width);
482 info_ptr->scal_s_width = NULL;
483
484 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
485
486 return;
487 }
488
489 memcpy(info_ptr->scal_s_height, sheight, lengthh);
490
491 info_ptr->valid |= PNG_INFO_sCAL;
492 info_ptr->free_me |= PNG_FREE_SCAL;
493 }
494
495 # ifdef PNG_FLOATING_POINT_SUPPORTED
496 void PNGAPI
png_set_sCAL(png_const_structrp png_ptr,png_inforp info_ptr,int unit,double width,double height)497 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
498 double width, double height)
499 {
500 png_debug1(1, "in %s storage function", "sCAL");
501
502 /* Check the arguments. */
503 if (width <= 0)
504 png_warning(png_ptr, "Invalid sCAL width ignored");
505
506 else if (height <= 0)
507 png_warning(png_ptr, "Invalid sCAL height ignored");
508
509 else
510 {
511 /* Convert 'width' and 'height' to ASCII. */
512 char swidth[PNG_sCAL_MAX_DIGITS+1];
513 char sheight[PNG_sCAL_MAX_DIGITS+1];
514
515 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
516 PNG_sCAL_PRECISION);
517 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
518 PNG_sCAL_PRECISION);
519
520 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
521 }
522 }
523 # endif
524
525 # ifdef PNG_FIXED_POINT_SUPPORTED
526 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)527 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
528 png_fixed_point width, png_fixed_point height)
529 {
530 png_debug1(1, "in %s storage function", "sCAL");
531
532 /* Check the arguments. */
533 if (width <= 0)
534 png_warning(png_ptr, "Invalid sCAL width ignored");
535
536 else if (height <= 0)
537 png_warning(png_ptr, "Invalid sCAL height ignored");
538
539 else
540 {
541 /* Convert 'width' and 'height' to ASCII. */
542 char swidth[PNG_sCAL_MAX_DIGITS+1];
543 char sheight[PNG_sCAL_MAX_DIGITS+1];
544
545 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
546 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
547
548 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
549 }
550 }
551 # endif
552 #endif
553
554 #ifdef PNG_pHYs_SUPPORTED
555 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)556 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
557 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
558 {
559 png_debug1(1, "in %s storage function", "pHYs");
560
561 if (png_ptr == NULL || info_ptr == NULL)
562 return;
563
564 info_ptr->x_pixels_per_unit = res_x;
565 info_ptr->y_pixels_per_unit = res_y;
566 info_ptr->phys_unit_type = (png_byte)unit_type;
567 info_ptr->valid |= PNG_INFO_pHYs;
568 }
569 #endif
570
571 void PNGAPI
png_set_PLTE(png_structrp png_ptr,png_inforp info_ptr,png_const_colorp palette,int num_palette)572 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
573 png_const_colorp palette, int num_palette)
574 {
575
576 png_uint_32 max_palette_length;
577
578 png_debug1(1, "in %s storage function", "PLTE");
579
580 if (png_ptr == NULL || info_ptr == NULL)
581 return;
582
583 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
584 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
585
586 if (num_palette < 0 || num_palette > (int) max_palette_length)
587 {
588 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
589 png_error(png_ptr, "Invalid palette length");
590
591 else
592 {
593 png_warning(png_ptr, "Invalid palette length");
594
595 return;
596 }
597 }
598
599 if ((num_palette > 0 && palette == NULL) ||
600 (num_palette == 0
601 # ifdef PNG_MNG_FEATURES_SUPPORTED
602 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
603 # endif
604 ))
605 {
606 png_error(png_ptr, "Invalid palette");
607 }
608
609 /* It may not actually be necessary to set png_ptr->palette here;
610 * we do it for backward compatibility with the way the png_handle_tRNS
611 * function used to do the allocation.
612 *
613 * 1.6.0: the above statement appears to be incorrect; something has to set
614 * the palette inside png_struct on read.
615 */
616 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
617
618 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
619 * of num_palette entries, in case of an invalid PNG file or incorrect
620 * call to png_set_PLTE() with too-large sample values.
621 */
622 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
623 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
624
625 if (num_palette > 0)
626 memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
627 (sizeof (png_color)));
628 info_ptr->palette = png_ptr->palette;
629 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
630
631 info_ptr->free_me |= PNG_FREE_PLTE;
632
633 info_ptr->valid |= PNG_INFO_PLTE;
634 }
635
636 #ifdef PNG_sBIT_SUPPORTED
637 void PNGAPI
png_set_sBIT(png_const_structrp png_ptr,png_inforp info_ptr,png_const_color_8p sig_bit)638 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
639 png_const_color_8p sig_bit)
640 {
641 png_debug1(1, "in %s storage function", "sBIT");
642
643 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
644 return;
645
646 info_ptr->sig_bit = *sig_bit;
647 info_ptr->valid |= PNG_INFO_sBIT;
648 }
649 #endif
650
651 #ifdef PNG_sRGB_SUPPORTED
652 void PNGAPI
png_set_sRGB(png_const_structrp png_ptr,png_inforp info_ptr,int srgb_intent)653 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
654 {
655 png_debug1(1, "in %s storage function", "sRGB");
656
657 if (png_ptr == NULL || info_ptr == NULL)
658 return;
659
660 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
661 png_colorspace_sync_info(png_ptr, info_ptr);
662 }
663
664 void PNGAPI
png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr,png_inforp info_ptr,int srgb_intent)665 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
666 int srgb_intent)
667 {
668 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
669
670 if (png_ptr == NULL || info_ptr == NULL)
671 return;
672
673 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
674 srgb_intent) != 0)
675 {
676 /* This causes the gAMA and cHRM to be written too */
677 info_ptr->colorspace.flags |=
678 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
679 }
680
681 png_colorspace_sync_info(png_ptr, info_ptr);
682 }
683 #endif /* sRGB */
684
685
686 #ifdef PNG_iCCP_SUPPORTED
687 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)688 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
689 png_const_charp name, int compression_type,
690 png_const_bytep profile, png_uint_32 proflen)
691 {
692 png_charp new_iccp_name;
693 png_bytep new_iccp_profile;
694 size_t length;
695
696 png_debug1(1, "in %s storage function", "iCCP");
697
698 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
699 return;
700
701 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
702 png_app_error(png_ptr, "Invalid iCCP compression method");
703
704 /* Set the colorspace first because this validates the profile; do not
705 * override previously set app cHRM or gAMA here (because likely as not the
706 * application knows better than libpng what the correct values are.) Pass
707 * the info_ptr color_type field to png_colorspace_set_ICC because in the
708 * write case it has not yet been stored in png_ptr.
709 */
710 {
711 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
712 proflen, profile, info_ptr->color_type);
713
714 png_colorspace_sync_info(png_ptr, info_ptr);
715
716 /* Don't do any of the copying if the profile was bad, or inconsistent. */
717 if (result == 0)
718 return;
719
720 /* But do write the gAMA and cHRM chunks from the profile. */
721 info_ptr->colorspace.flags |=
722 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
723 }
724
725 length = strlen(name)+1;
726 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
727
728 if (new_iccp_name == NULL)
729 {
730 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
731
732 return;
733 }
734
735 memcpy(new_iccp_name, name, length);
736 new_iccp_profile = png_voidcast(png_bytep,
737 png_malloc_warn(png_ptr, proflen));
738
739 if (new_iccp_profile == NULL)
740 {
741 png_free(png_ptr, new_iccp_name);
742 png_benign_error(png_ptr,
743 "Insufficient memory to process iCCP profile");
744
745 return;
746 }
747
748 memcpy(new_iccp_profile, profile, proflen);
749
750 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
751
752 info_ptr->iccp_proflen = proflen;
753 info_ptr->iccp_name = new_iccp_name;
754 info_ptr->iccp_profile = new_iccp_profile;
755 info_ptr->free_me |= PNG_FREE_ICCP;
756 info_ptr->valid |= PNG_INFO_iCCP;
757 }
758 #endif
759
760 #ifdef PNG_TEXT_SUPPORTED
761 void PNGAPI
png_set_text(png_const_structrp png_ptr,png_inforp info_ptr,png_const_textp text_ptr,int num_text)762 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
763 png_const_textp text_ptr, int num_text)
764 {
765 int ret;
766 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
767
768 if (ret != 0)
769 png_error(png_ptr, "Insufficient memory to store text");
770 }
771
772 int /* PRIVATE */
png_set_text_2(png_const_structrp png_ptr,png_inforp info_ptr,png_const_textp text_ptr,int num_text)773 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
774 png_const_textp text_ptr, int num_text)
775 {
776 int i;
777
778 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
779 (unsigned long)png_ptr->chunk_name);
780
781 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
782 return(0);
783
784 /* Make sure we have enough space in the "text" array in info_struct
785 * to hold all of the incoming text_ptr objects. This compare can't overflow
786 * because max_text >= num_text (anyway, subtract of two positive integers
787 * can't overflow in any case.)
788 */
789 if (num_text > info_ptr->max_text - info_ptr->num_text)
790 {
791 int old_num_text = info_ptr->num_text;
792 int max_text;
793 png_textp new_text = NULL;
794
795 /* Calculate an appropriate max_text, checking for overflow. */
796 max_text = old_num_text;
797 if (num_text <= INT_MAX - max_text)
798 {
799 max_text += num_text;
800
801 /* Round up to a multiple of 8 */
802 if (max_text < INT_MAX-8)
803 max_text = (max_text + 8) & ~0x7;
804
805 else
806 max_text = INT_MAX;
807
808 /* Now allocate a new array and copy the old members in; this does all
809 * the overflow checks.
810 */
811 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
812 info_ptr->text, old_num_text, max_text-old_num_text,
813 sizeof *new_text));
814 }
815
816 if (new_text == NULL)
817 {
818 png_chunk_report(png_ptr, "too many text chunks",
819 PNG_CHUNK_WRITE_ERROR);
820
821 return 1;
822 }
823
824 png_free(png_ptr, info_ptr->text);
825
826 info_ptr->text = new_text;
827 info_ptr->free_me |= PNG_FREE_TEXT;
828 info_ptr->max_text = max_text;
829 /* num_text is adjusted below as the entries are copied in */
830
831 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
832 }
833
834 for (i = 0; i < num_text; i++)
835 {
836 size_t text_length, key_len;
837 size_t lang_len, lang_key_len;
838 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
839
840 if (text_ptr[i].key == NULL)
841 continue;
842
843 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
844 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
845 {
846 png_chunk_report(png_ptr, "text compression mode is out of range",
847 PNG_CHUNK_WRITE_ERROR);
848 continue;
849 }
850
851 key_len = strlen(text_ptr[i].key);
852
853 if (text_ptr[i].compression <= 0)
854 {
855 lang_len = 0;
856 lang_key_len = 0;
857 }
858
859 else
860 # ifdef PNG_iTXt_SUPPORTED
861 {
862 /* Set iTXt data */
863
864 if (text_ptr[i].lang != NULL)
865 lang_len = strlen(text_ptr[i].lang);
866
867 else
868 lang_len = 0;
869
870 if (text_ptr[i].lang_key != NULL)
871 lang_key_len = strlen(text_ptr[i].lang_key);
872
873 else
874 lang_key_len = 0;
875 }
876 # else /* iTXt */
877 {
878 png_chunk_report(png_ptr, "iTXt chunk not supported",
879 PNG_CHUNK_WRITE_ERROR);
880 continue;
881 }
882 # endif
883
884 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
885 {
886 text_length = 0;
887 # ifdef PNG_iTXt_SUPPORTED
888 if (text_ptr[i].compression > 0)
889 textp->compression = PNG_ITXT_COMPRESSION_NONE;
890
891 else
892 # endif
893 textp->compression = PNG_TEXT_COMPRESSION_NONE;
894 }
895
896 else
897 {
898 text_length = strlen(text_ptr[i].text);
899 textp->compression = text_ptr[i].compression;
900 }
901
902 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
903 key_len + text_length + lang_len + lang_key_len + 4));
904
905 if (textp->key == NULL)
906 {
907 png_chunk_report(png_ptr, "text chunk: out of memory",
908 PNG_CHUNK_WRITE_ERROR);
909
910 return 1;
911 }
912
913 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
914 (unsigned long)(png_uint_32)
915 (key_len + lang_len + lang_key_len + text_length + 4),
916 textp->key);
917
918 memcpy(textp->key, text_ptr[i].key, key_len);
919 *(textp->key + key_len) = '\0';
920
921 if (text_ptr[i].compression > 0)
922 {
923 textp->lang = textp->key + key_len + 1;
924 memcpy(textp->lang, text_ptr[i].lang, lang_len);
925 *(textp->lang + lang_len) = '\0';
926 textp->lang_key = textp->lang + lang_len + 1;
927 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
928 *(textp->lang_key + lang_key_len) = '\0';
929 textp->text = textp->lang_key + lang_key_len + 1;
930 }
931
932 else
933 {
934 textp->lang=NULL;
935 textp->lang_key=NULL;
936 textp->text = textp->key + key_len + 1;
937 }
938
939 if (text_length != 0)
940 memcpy(textp->text, text_ptr[i].text, text_length);
941
942 *(textp->text + text_length) = '\0';
943
944 # ifdef PNG_iTXt_SUPPORTED
945 if (textp->compression > 0)
946 {
947 textp->text_length = 0;
948 textp->itxt_length = text_length;
949 }
950
951 else
952 # endif
953 {
954 textp->text_length = text_length;
955 textp->itxt_length = 0;
956 }
957
958 info_ptr->num_text++;
959 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
960 }
961
962 return(0);
963 }
964 #endif
965
966 #ifdef PNG_tIME_SUPPORTED
967 void PNGAPI
png_set_tIME(png_const_structrp png_ptr,png_inforp info_ptr,png_const_timep mod_time)968 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
969 png_const_timep mod_time)
970 {
971 png_debug1(1, "in %s storage function", "tIME");
972
973 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
974 (png_ptr->mode & PNG_WROTE_tIME) != 0)
975 return;
976
977 if (mod_time->month == 0 || mod_time->month > 12 ||
978 mod_time->day == 0 || mod_time->day > 31 ||
979 mod_time->hour > 23 || mod_time->minute > 59 ||
980 mod_time->second > 60)
981 {
982 png_warning(png_ptr, "Ignoring invalid time value");
983
984 return;
985 }
986
987 info_ptr->mod_time = *mod_time;
988 info_ptr->valid |= PNG_INFO_tIME;
989 }
990 #endif
991
992 #ifdef PNG_tRNS_SUPPORTED
993 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)994 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
995 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
996 {
997 png_debug1(1, "in %s storage function", "tRNS");
998
999 if (png_ptr == NULL || info_ptr == NULL)
1000
1001 return;
1002
1003 if (trans_alpha != NULL)
1004 {
1005 /* It may not actually be necessary to set png_ptr->trans_alpha here;
1006 * we do it for backward compatibility with the way the png_handle_tRNS
1007 * function used to do the allocation.
1008 *
1009 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
1010 * relies on png_set_tRNS storing the information in png_struct
1011 * (otherwise it won't be there for the code in pngrtran.c).
1012 */
1013
1014 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
1015
1016 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
1017 {
1018 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
1019 info_ptr->trans_alpha = png_voidcast(png_bytep,
1020 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
1021 memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
1022
1023 info_ptr->valid |= PNG_INFO_tRNS;
1024 info_ptr->free_me |= PNG_FREE_TRNS;
1025 }
1026 png_ptr->trans_alpha = info_ptr->trans_alpha;
1027 }
1028
1029 if (trans_color != NULL)
1030 {
1031 #ifdef PNG_WARNINGS_SUPPORTED
1032 if (info_ptr->bit_depth < 16)
1033 {
1034 int sample_max = (1 << info_ptr->bit_depth) - 1;
1035
1036 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
1037 trans_color->gray > sample_max) ||
1038 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
1039 (trans_color->red > sample_max ||
1040 trans_color->green > sample_max ||
1041 trans_color->blue > sample_max)))
1042 png_warning(png_ptr,
1043 "tRNS chunk has out-of-range samples for bit_depth");
1044 }
1045 #endif
1046
1047 info_ptr->trans_color = *trans_color;
1048
1049 if (num_trans == 0)
1050 num_trans = 1;
1051 }
1052
1053 info_ptr->num_trans = (png_uint_16)num_trans;
1054
1055 if (num_trans != 0)
1056 {
1057 info_ptr->valid |= PNG_INFO_tRNS;
1058 info_ptr->free_me |= PNG_FREE_TRNS;
1059 }
1060 }
1061 #endif
1062
1063 #ifdef PNG_sPLT_SUPPORTED
1064 void PNGAPI
png_set_sPLT(png_const_structrp png_ptr,png_inforp info_ptr,png_const_sPLT_tp entries,int nentries)1065 png_set_sPLT(png_const_structrp png_ptr,
1066 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1067 /*
1068 * entries - array of png_sPLT_t structures
1069 * to be added to the list of palettes
1070 * in the info structure.
1071 *
1072 * nentries - number of palette structures to be
1073 * added.
1074 */
1075 {
1076 png_sPLT_tp np;
1077
1078 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1079 return;
1080
1081 /* Use the internal realloc function, which checks for all the possible
1082 * overflows. Notice that the parameters are (int) and (size_t)
1083 */
1084 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1085 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1086 sizeof *np));
1087
1088 if (np == NULL)
1089 {
1090 /* Out of memory or too many chunks */
1091 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1092
1093 return;
1094 }
1095
1096 png_free(png_ptr, info_ptr->splt_palettes);
1097 info_ptr->splt_palettes = np;
1098 info_ptr->free_me |= PNG_FREE_SPLT;
1099
1100 np += info_ptr->splt_palettes_num;
1101
1102 do
1103 {
1104 size_t length;
1105
1106 /* Skip invalid input entries */
1107 if (entries->name == NULL || entries->entries == NULL)
1108 {
1109 /* png_handle_sPLT doesn't do this, so this is an app error */
1110 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1111 /* Just skip the invalid entry */
1112 continue;
1113 }
1114
1115 np->depth = entries->depth;
1116
1117 /* In the event of out-of-memory just return - there's no point keeping
1118 * on trying to add sPLT chunks.
1119 */
1120 length = strlen(entries->name) + 1;
1121 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1122
1123 if (np->name == NULL)
1124 break;
1125
1126 memcpy(np->name, entries->name, length);
1127
1128 /* IMPORTANT: we have memory now that won't get freed if something else
1129 * goes wrong; this code must free it. png_malloc_array produces no
1130 * warnings; use a png_chunk_report (below) if there is an error.
1131 */
1132 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1133 entries->nentries, sizeof (png_sPLT_entry)));
1134
1135 if (np->entries == NULL)
1136 {
1137 png_free(png_ptr, np->name);
1138 np->name = NULL;
1139 break;
1140 }
1141
1142 np->nentries = entries->nentries;
1143 /* This multiply can't overflow because png_malloc_array has already
1144 * checked it when doing the allocation.
1145 */
1146 memcpy(np->entries, entries->entries,
1147 (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
1148
1149 /* Note that 'continue' skips the advance of the out pointer and out
1150 * count, so an invalid entry is not added.
1151 */
1152 info_ptr->valid |= PNG_INFO_sPLT;
1153 ++(info_ptr->splt_palettes_num);
1154 ++np;
1155 ++entries;
1156 }
1157 while (--nentries);
1158
1159 if (nentries > 0)
1160 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1161 }
1162 #endif /* sPLT */
1163
1164 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1165 static png_byte
check_location(png_const_structrp png_ptr,int location)1166 check_location(png_const_structrp png_ptr, int location)
1167 {
1168 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1169
1170 /* New in 1.6.0; copy the location and check it. This is an API
1171 * change; previously the app had to use the
1172 * png_set_unknown_chunk_location API below for each chunk.
1173 */
1174 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1175 {
1176 /* Write struct, so unknown chunks come from the app */
1177 png_app_warning(png_ptr,
1178 "png_set_unknown_chunks now expects a valid location");
1179 /* Use the old behavior */
1180 location = (png_byte)(png_ptr->mode &
1181 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1182 }
1183
1184 /* This need not be an internal error - if the app calls
1185 * png_set_unknown_chunks on a read pointer it must get the location right.
1186 */
1187 if (location == 0)
1188 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1189
1190 /* Now reduce the location to the top-most set bit by removing each least
1191 * significant bit in turn.
1192 */
1193 while (location != (location & -location))
1194 location &= ~(location & -location);
1195
1196 /* The cast is safe because 'location' is a bit mask and only the low four
1197 * bits are significant.
1198 */
1199 return (png_byte)location;
1200 }
1201
1202 void PNGAPI
png_set_unknown_chunks(png_const_structrp png_ptr,png_inforp info_ptr,png_const_unknown_chunkp unknowns,int num_unknowns)1203 png_set_unknown_chunks(png_const_structrp png_ptr,
1204 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1205 {
1206 png_unknown_chunkp np;
1207
1208 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1209 unknowns == NULL)
1210 return;
1211
1212 /* Check for the failure cases where support has been disabled at compile
1213 * time. This code is hardly ever compiled - it's here because
1214 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1215 * code) but may be meaningless if the read or write handling of unknown
1216 * chunks is not compiled in.
1217 */
1218 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1219 defined(PNG_READ_SUPPORTED)
1220 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1221 {
1222 png_app_error(png_ptr, "no unknown chunk support on read");
1223
1224 return;
1225 }
1226 # endif
1227 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1228 defined(PNG_WRITE_SUPPORTED)
1229 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1230 {
1231 png_app_error(png_ptr, "no unknown chunk support on write");
1232
1233 return;
1234 }
1235 # endif
1236
1237 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1238 * unknown critical chunks could be lost with just a warning resulting in
1239 * undefined behavior. Now png_chunk_report is used to provide behavior
1240 * appropriate to read or write.
1241 */
1242 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1243 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1244 sizeof *np));
1245
1246 if (np == NULL)
1247 {
1248 png_chunk_report(png_ptr, "too many unknown chunks",
1249 PNG_CHUNK_WRITE_ERROR);
1250
1251 return;
1252 }
1253
1254 png_free(png_ptr, info_ptr->unknown_chunks);
1255 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1256 info_ptr->free_me |= PNG_FREE_UNKN;
1257
1258 np += info_ptr->unknown_chunks_num;
1259
1260 /* Increment unknown_chunks_num each time round the loop to protect the
1261 * just-allocated chunk data.
1262 */
1263 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1264 {
1265 memcpy(np->name, unknowns->name, (sizeof np->name));
1266 np->name[(sizeof np->name)-1] = '\0';
1267 np->location = check_location(png_ptr, unknowns->location);
1268
1269 if (unknowns->size == 0)
1270 {
1271 np->data = NULL;
1272 np->size = 0;
1273 }
1274
1275 else
1276 {
1277 np->data = png_voidcast(png_bytep,
1278 png_malloc_base(png_ptr, unknowns->size));
1279
1280 if (np->data == NULL)
1281 {
1282 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1283 PNG_CHUNK_WRITE_ERROR);
1284 /* But just skip storing the unknown chunk */
1285 continue;
1286 }
1287
1288 memcpy(np->data, unknowns->data, unknowns->size);
1289 np->size = unknowns->size;
1290 }
1291
1292 /* These increments are skipped on out-of-memory for the data - the
1293 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1294 * This is correct in the read case (the chunk is just dropped.)
1295 */
1296 ++np;
1297 ++(info_ptr->unknown_chunks_num);
1298 }
1299 }
1300
1301 void PNGAPI
png_set_unknown_chunk_location(png_const_structrp png_ptr,png_inforp info_ptr,int chunk,int location)1302 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1303 int chunk, int location)
1304 {
1305 /* This API is pretty pointless in 1.6.0 because the location can be set
1306 * before the call to png_set_unknown_chunks.
1307 *
1308 * TODO: add a png_app_warning in 1.7
1309 */
1310 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1311 chunk < info_ptr->unknown_chunks_num)
1312 {
1313 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1314 {
1315 png_app_error(png_ptr, "invalid unknown chunk location");
1316 /* Fake out the pre 1.6.0 behavior: */
1317 if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1318 location = PNG_AFTER_IDAT;
1319
1320 else
1321 location = PNG_HAVE_IHDR; /* also undocumented */
1322 }
1323
1324 info_ptr->unknown_chunks[chunk].location =
1325 check_location(png_ptr, location);
1326 }
1327 }
1328 #endif /* STORE_UNKNOWN_CHUNKS */
1329
1330 #ifdef PNG_MNG_FEATURES_SUPPORTED
1331 png_uint_32 PNGAPI
png_permit_mng_features(png_structrp png_ptr,png_uint_32 mng_features)1332 png_permit_mng_features(png_structrp png_ptr, png_uint_32 mng_features)
1333 {
1334 png_debug(1, "in png_permit_mng_features");
1335
1336 if (png_ptr == NULL)
1337 return 0;
1338
1339 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1340
1341 return png_ptr->mng_features_permitted;
1342 }
1343 #endif
1344
1345 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1346 static unsigned int
add_one_chunk(png_bytep list,unsigned int count,png_const_bytep add,int keep)1347 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1348 {
1349 unsigned int i;
1350
1351 /* Utility function: update the 'keep' state of a chunk if it is already in
1352 * the list, otherwise add it to the list.
1353 */
1354 for (i=0; i<count; ++i, list += 5)
1355 {
1356 if (memcmp(list, add, 4) == 0)
1357 {
1358 list[4] = (png_byte)keep;
1359
1360 return count;
1361 }
1362 }
1363
1364 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1365 {
1366 ++count;
1367 memcpy(list, add, 4);
1368 list[4] = (png_byte)keep;
1369 }
1370
1371 return count;
1372 }
1373
1374 void PNGAPI
png_set_keep_unknown_chunks(png_structrp png_ptr,int keep,png_const_bytep chunk_list,int num_chunks_in)1375 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1376 png_const_bytep chunk_list, int num_chunks_in)
1377 {
1378 png_bytep new_list;
1379 unsigned int num_chunks, old_num_chunks;
1380
1381 if (png_ptr == NULL)
1382 return;
1383
1384 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1385 {
1386 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1387
1388 return;
1389 }
1390
1391 if (num_chunks_in <= 0)
1392 {
1393 png_ptr->unknown_default = keep;
1394
1395 /* '0' means just set the flags, so stop here */
1396 if (num_chunks_in == 0)
1397 return;
1398 }
1399
1400 if (num_chunks_in < 0)
1401 {
1402 /* Ignore all unknown chunks and all chunks recognized by
1403 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1404 */
1405 static const png_byte chunks_to_ignore[] = {
1406 98, 75, 71, 68, '\0', /* bKGD */
1407 99, 72, 82, 77, '\0', /* cHRM */
1408 101, 88, 73, 102, '\0', /* eXIf */
1409 103, 65, 77, 65, '\0', /* gAMA */
1410 104, 73, 83, 84, '\0', /* hIST */
1411 105, 67, 67, 80, '\0', /* iCCP */
1412 105, 84, 88, 116, '\0', /* iTXt */
1413 111, 70, 70, 115, '\0', /* oFFs */
1414 112, 67, 65, 76, '\0', /* pCAL */
1415 112, 72, 89, 115, '\0', /* pHYs */
1416 115, 66, 73, 84, '\0', /* sBIT */
1417 115, 67, 65, 76, '\0', /* sCAL */
1418 115, 80, 76, 84, '\0', /* sPLT */
1419 115, 84, 69, 82, '\0', /* sTER */
1420 115, 82, 71, 66, '\0', /* sRGB */
1421 116, 69, 88, 116, '\0', /* tEXt */
1422 116, 73, 77, 69, '\0', /* tIME */
1423 122, 84, 88, 116, '\0' /* zTXt */
1424 };
1425
1426 chunk_list = chunks_to_ignore;
1427 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1428 }
1429
1430 else /* num_chunks_in > 0 */
1431 {
1432 if (chunk_list == NULL)
1433 {
1434 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1435 * which can be switched off.
1436 */
1437 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1438
1439 return;
1440 }
1441
1442 num_chunks = (unsigned int)num_chunks_in;
1443 }
1444
1445 old_num_chunks = png_ptr->num_chunk_list;
1446 if (png_ptr->chunk_list == NULL)
1447 old_num_chunks = 0;
1448
1449 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1450 */
1451 if (num_chunks + old_num_chunks > UINT_MAX/5)
1452 {
1453 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1454
1455 return;
1456 }
1457
1458 /* If these chunks are being reset to the default then no more memory is
1459 * required because add_one_chunk above doesn't extend the list if the 'keep'
1460 * parameter is the default.
1461 */
1462 if (keep != 0)
1463 {
1464 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1465 5 * (num_chunks + old_num_chunks)));
1466
1467 if (old_num_chunks > 0)
1468 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1469 }
1470
1471 else if (old_num_chunks > 0)
1472 new_list = png_ptr->chunk_list;
1473
1474 else
1475 new_list = NULL;
1476
1477 /* Add the new chunks together with each one's handling code. If the chunk
1478 * already exists the code is updated, otherwise the chunk is added to the
1479 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1480 * the earlier convention that the last setting is the one that is used.)
1481 */
1482 if (new_list != NULL)
1483 {
1484 png_const_bytep inlist;
1485 png_bytep outlist;
1486 unsigned int i;
1487
1488 for (i=0; i<num_chunks; ++i)
1489 {
1490 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1491 chunk_list+5*i, keep);
1492 }
1493
1494 /* Now remove any spurious 'default' entries. */
1495 num_chunks = 0;
1496 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1497 {
1498 if (inlist[4])
1499 {
1500 if (outlist != inlist)
1501 memcpy(outlist, inlist, 5);
1502 outlist += 5;
1503 ++num_chunks;
1504 }
1505 }
1506
1507 /* This means the application has removed all the specialized handling. */
1508 if (num_chunks == 0)
1509 {
1510 if (png_ptr->chunk_list != new_list)
1511 png_free(png_ptr, new_list);
1512
1513 new_list = NULL;
1514 }
1515 }
1516
1517 else
1518 num_chunks = 0;
1519
1520 png_ptr->num_chunk_list = num_chunks;
1521
1522 if (png_ptr->chunk_list != new_list)
1523 {
1524 if (png_ptr->chunk_list != NULL)
1525 png_free(png_ptr, png_ptr->chunk_list);
1526
1527 png_ptr->chunk_list = new_list;
1528 }
1529 }
1530 #endif
1531
1532 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1533 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)1534 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1535 png_user_chunk_ptr read_user_chunk_fn)
1536 {
1537 png_debug(1, "in png_set_read_user_chunk_fn");
1538
1539 if (png_ptr == NULL)
1540 return;
1541
1542 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1543 png_ptr->user_chunk_ptr = user_chunk_ptr;
1544 }
1545 #endif
1546
1547 #ifdef PNG_INFO_IMAGE_SUPPORTED
1548 void PNGAPI
png_set_rows(png_const_structrp png_ptr,png_inforp info_ptr,png_bytepp row_pointers)1549 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1550 png_bytepp row_pointers)
1551 {
1552 png_debug1(1, "in %s storage function", "rows");
1553
1554 if (png_ptr == NULL || info_ptr == NULL)
1555 return;
1556
1557 if (info_ptr->row_pointers != NULL &&
1558 (info_ptr->row_pointers != row_pointers))
1559 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1560
1561 info_ptr->row_pointers = row_pointers;
1562
1563 if (row_pointers != NULL)
1564 info_ptr->valid |= PNG_INFO_IDAT;
1565 }
1566 #endif
1567
1568 void PNGAPI
png_set_compression_buffer_size(png_structrp png_ptr,size_t size)1569 png_set_compression_buffer_size(png_structrp png_ptr, size_t size)
1570 {
1571 if (png_ptr == NULL)
1572 return;
1573
1574 if (size == 0 || size > PNG_UINT_31_MAX)
1575 png_error(png_ptr, "invalid compression buffer size");
1576
1577 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1578 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1579 {
1580 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1581 return;
1582 }
1583 # endif
1584
1585 # ifdef PNG_WRITE_SUPPORTED
1586 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1587 {
1588 if (png_ptr->zowner != 0)
1589 {
1590 png_warning(png_ptr,
1591 "Compression buffer size cannot be changed because it is in use");
1592
1593 return;
1594 }
1595
1596 #ifndef __COVERITY__
1597 /* Some compilers complain that this is always false. However, it
1598 * can be true when integer overflow happens.
1599 */
1600 if (size > ZLIB_IO_MAX)
1601 {
1602 png_warning(png_ptr,
1603 "Compression buffer size limited to system maximum");
1604 size = ZLIB_IO_MAX; /* must fit */
1605 }
1606 #endif
1607
1608 if (size < 6)
1609 {
1610 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1611 * if this is permitted.
1612 */
1613 png_warning(png_ptr,
1614 "Compression buffer size cannot be reduced below 6");
1615
1616 return;
1617 }
1618
1619 if (png_ptr->zbuffer_size != size)
1620 {
1621 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1622 png_ptr->zbuffer_size = (uInt)size;
1623 }
1624 }
1625 # endif
1626 }
1627
1628 void PNGAPI
png_set_invalid(png_const_structrp png_ptr,png_inforp info_ptr,int mask)1629 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1630 {
1631 if (png_ptr != NULL && info_ptr != NULL)
1632 info_ptr->valid &= (unsigned int)(~mask);
1633 }
1634
1635
1636 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1637 /* This function was added to libpng 1.2.6 */
1638 void PNGAPI
png_set_user_limits(png_structrp png_ptr,png_uint_32 user_width_max,png_uint_32 user_height_max)1639 png_set_user_limits(png_structrp png_ptr, png_uint_32 user_width_max,
1640 png_uint_32 user_height_max)
1641 {
1642 /* Images with dimensions larger than these limits will be
1643 * rejected by png_set_IHDR(). To accept any PNG datastream
1644 * regardless of dimensions, set both limits to 0x7fffffff.
1645 */
1646 if (png_ptr == NULL)
1647 return;
1648
1649 png_ptr->user_width_max = user_width_max;
1650 png_ptr->user_height_max = user_height_max;
1651 }
1652
1653 /* This function was added to libpng 1.4.0 */
1654 void PNGAPI
png_set_chunk_cache_max(png_structrp png_ptr,png_uint_32 user_chunk_cache_max)1655 png_set_chunk_cache_max(png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1656 {
1657 if (png_ptr != NULL)
1658 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1659 }
1660
1661 /* This function was added to libpng 1.4.1 */
1662 void PNGAPI
png_set_chunk_malloc_max(png_structrp png_ptr,png_alloc_size_t user_chunk_malloc_max)1663 png_set_chunk_malloc_max(png_structrp png_ptr,
1664 png_alloc_size_t user_chunk_malloc_max)
1665 {
1666 if (png_ptr != NULL)
1667 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1668 }
1669 #endif /* ?SET_USER_LIMITS */
1670
1671
1672 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1673 void PNGAPI
png_set_benign_errors(png_structrp png_ptr,int allowed)1674 png_set_benign_errors(png_structrp png_ptr, int allowed)
1675 {
1676 png_debug(1, "in png_set_benign_errors");
1677
1678 /* If allowed is 1, png_benign_error() is treated as a warning.
1679 *
1680 * If allowed is 0, png_benign_error() is treated as an error (which
1681 * is the default behavior if png_set_benign_errors() is not called).
1682 */
1683
1684 if (allowed != 0)
1685 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1686 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1687
1688 else
1689 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1690 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1691 }
1692 #endif /* BENIGN_ERRORS */
1693
1694 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1695 /* Whether to report invalid palette index; added at libng-1.5.10.
1696 * It is possible for an indexed (color-type==3) PNG file to contain
1697 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1698 * fewer entries than the image's bit-depth would allow. We recover
1699 * from this gracefully by filling any incomplete palette with zeros
1700 * (opaque black). By default, when this occurs libpng will issue
1701 * a benign error. This API can be used to override that behavior.
1702 */
1703 void PNGAPI
png_set_check_for_invalid_index(png_structrp png_ptr,int allowed)1704 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1705 {
1706 png_debug(1, "in png_set_check_for_invalid_index");
1707
1708 if (allowed > 0)
1709 png_ptr->num_palette_max = 0;
1710
1711 else
1712 png_ptr->num_palette_max = -1;
1713 }
1714 #endif
1715
1716 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1717 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1718 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1719 * and if invalid, correct the keyword rather than discarding the entire
1720 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1721 * length, forbids leading or trailing whitespace, multiple internal spaces,
1722 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1723 *
1724 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1725 * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1726 * valid one could not be generated, and the caller must png_error.
1727 */
1728 png_uint_32 /* PRIVATE */
png_check_keyword(png_structrp png_ptr,png_const_charp key,png_bytep new_key)1729 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1730 {
1731 #ifdef PNG_WARNINGS_SUPPORTED
1732 png_const_charp orig_key = key;
1733 #endif
1734 png_uint_32 key_len = 0;
1735 int bad_character = 0;
1736 int space = 1;
1737
1738 png_debug(1, "in png_check_keyword");
1739
1740 if (key == NULL)
1741 {
1742 *new_key = 0;
1743 return 0;
1744 }
1745
1746 while (*key && key_len < 79)
1747 {
1748 png_byte ch = (png_byte)*key++;
1749
1750 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1751 {
1752 *new_key++ = ch; ++key_len; space = 0;
1753 }
1754
1755 else if (space == 0)
1756 {
1757 /* A space or an invalid character when one wasn't seen immediately
1758 * before; output just a space.
1759 */
1760 *new_key++ = 32; ++key_len; space = 1;
1761
1762 /* If the character was not a space then it is invalid. */
1763 if (ch != 32)
1764 bad_character = ch;
1765 }
1766
1767 else if (bad_character == 0)
1768 bad_character = ch; /* just skip it, record the first error */
1769 }
1770
1771 if (key_len > 0 && space != 0) /* trailing space */
1772 {
1773 --key_len; --new_key;
1774 if (bad_character == 0)
1775 bad_character = 32;
1776 }
1777
1778 /* Terminate the keyword */
1779 *new_key = 0;
1780
1781 if (key_len == 0)
1782 return 0;
1783
1784 #ifdef PNG_WARNINGS_SUPPORTED
1785 /* Try to only output one warning per keyword: */
1786 if (*key != 0) /* keyword too long */
1787 png_warning(png_ptr, "keyword truncated");
1788
1789 else if (bad_character != 0)
1790 {
1791 PNG_WARNING_PARAMETERS(p)
1792
1793 png_warning_parameter(p, 1, orig_key);
1794 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1795
1796 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1797 }
1798 #else /* !WARNINGS */
1799 PNG_UNUSED(png_ptr)
1800 #endif /* !WARNINGS */
1801
1802 return key_len;
1803 }
1804 #endif /* TEXT || pCAL || iCCP || sPLT */
1805 #endif /* READ || WRITE */
1806