1
2 /* pngset.c - storage of image information into info struct
3 *
4 * Copyright (c) 2018 Cosmin Truta
5 * Copyright (c) 1998-2018 Glenn Randers-Pehrson
6 * Copyright (c) 1996-1997 Andreas Dilger
7 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 *
13 * The functions here are used during reads to store data from the file
14 * into the info struct, and during writes to store application data
15 * into the info struct for writing into the file. This abstracts the
16 * info struct and allows us to change the structure in the future.
17 */
18
19 #include "pngpriv.h"
20
21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
22
23 #ifdef PNG_bKGD_SUPPORTED
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 #ifdef PNG_APNG_SUPPORTED
293 /* for non-animated png. this may be overwritten from an acTL chunk later */
294 info_ptr->num_frames = 1;
295 #endif
296 }
297
298 #ifdef PNG_oFFs_SUPPORTED
299 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)300 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
301 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
302 {
303 png_debug1(1, "in %s storage function", "oFFs");
304
305 if (png_ptr == NULL || info_ptr == NULL)
306 return;
307
308 info_ptr->x_offset = offset_x;
309 info_ptr->y_offset = offset_y;
310 info_ptr->offset_unit_type = (png_byte)unit_type;
311 info_ptr->valid |= PNG_INFO_oFFs;
312 }
313 #endif
314
315 #ifdef PNG_pCAL_SUPPORTED
316 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)317 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
318 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
319 int nparams, png_const_charp units, png_charpp params)
320 {
321 size_t length;
322 int i;
323
324 png_debug1(1, "in %s storage function", "pCAL");
325
326 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
327 || (nparams > 0 && params == NULL))
328 return;
329
330 length = strlen(purpose) + 1;
331 png_debug1(3, "allocating purpose for info (%lu bytes)",
332 (unsigned long)length);
333
334 /* TODO: validate format of calibration name and unit name */
335
336 /* Check that the type matches the specification. */
337 if (type < 0 || type > 3)
338 {
339 png_chunk_report(png_ptr, "Invalid pCAL equation type",
340 PNG_CHUNK_WRITE_ERROR);
341 return;
342 }
343
344 if (nparams < 0 || nparams > 255)
345 {
346 png_chunk_report(png_ptr, "Invalid pCAL parameter count",
347 PNG_CHUNK_WRITE_ERROR);
348 return;
349 }
350
351 /* Validate params[nparams] */
352 for (i=0; i<nparams; ++i)
353 {
354 if (params[i] == NULL ||
355 !png_check_fp_string(params[i], strlen(params[i])))
356 {
357 png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
358 PNG_CHUNK_WRITE_ERROR);
359 return;
360 }
361 }
362
363 info_ptr->pcal_purpose = png_voidcast(png_charp,
364 png_malloc_warn(png_ptr, length));
365
366 if (info_ptr->pcal_purpose == NULL)
367 {
368 png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
369 PNG_CHUNK_WRITE_ERROR);
370 return;
371 }
372
373 memcpy(info_ptr->pcal_purpose, purpose, length);
374
375 png_debug(3, "storing X0, X1, type, and nparams in info");
376 info_ptr->pcal_X0 = X0;
377 info_ptr->pcal_X1 = X1;
378 info_ptr->pcal_type = (png_byte)type;
379 info_ptr->pcal_nparams = (png_byte)nparams;
380
381 length = strlen(units) + 1;
382 png_debug1(3, "allocating units for info (%lu bytes)",
383 (unsigned long)length);
384
385 info_ptr->pcal_units = png_voidcast(png_charp,
386 png_malloc_warn(png_ptr, length));
387
388 if (info_ptr->pcal_units == NULL)
389 {
390 png_warning(png_ptr, "Insufficient memory for pCAL units");
391
392 return;
393 }
394
395 memcpy(info_ptr->pcal_units, units, length);
396
397 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
398 (size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
399
400 if (info_ptr->pcal_params == NULL)
401 {
402 png_warning(png_ptr, "Insufficient memory for pCAL params");
403
404 return;
405 }
406
407 memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
408 (sizeof (png_charp)));
409
410 for (i = 0; i < nparams; i++)
411 {
412 length = strlen(params[i]) + 1;
413 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
414 (unsigned long)length);
415
416 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
417
418 if (info_ptr->pcal_params[i] == NULL)
419 {
420 png_warning(png_ptr, "Insufficient memory for pCAL parameter");
421
422 return;
423 }
424
425 memcpy(info_ptr->pcal_params[i], params[i], length);
426 }
427
428 info_ptr->valid |= PNG_INFO_pCAL;
429 info_ptr->free_me |= PNG_FREE_PCAL;
430 }
431 #endif
432
433 #ifdef PNG_sCAL_SUPPORTED
434 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)435 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
436 int unit, png_const_charp swidth, png_const_charp sheight)
437 {
438 size_t lengthw = 0, lengthh = 0;
439
440 png_debug1(1, "in %s storage function", "sCAL");
441
442 if (png_ptr == NULL || info_ptr == NULL)
443 return;
444
445 /* Double check the unit (should never get here with an invalid
446 * unit unless this is an API call.)
447 */
448 if (unit != 1 && unit != 2)
449 png_error(png_ptr, "Invalid sCAL unit");
450
451 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
452 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
453 png_error(png_ptr, "Invalid sCAL width");
454
455 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
456 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
457 png_error(png_ptr, "Invalid sCAL height");
458
459 info_ptr->scal_unit = (png_byte)unit;
460
461 ++lengthw;
462
463 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
464
465 info_ptr->scal_s_width = png_voidcast(png_charp,
466 png_malloc_warn(png_ptr, lengthw));
467
468 if (info_ptr->scal_s_width == NULL)
469 {
470 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
471
472 return;
473 }
474
475 memcpy(info_ptr->scal_s_width, swidth, lengthw);
476
477 ++lengthh;
478
479 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
480
481 info_ptr->scal_s_height = png_voidcast(png_charp,
482 png_malloc_warn(png_ptr, lengthh));
483
484 if (info_ptr->scal_s_height == NULL)
485 {
486 png_free (png_ptr, info_ptr->scal_s_width);
487 info_ptr->scal_s_width = NULL;
488
489 png_warning(png_ptr, "Memory allocation failed while processing sCAL");
490
491 return;
492 }
493
494 memcpy(info_ptr->scal_s_height, sheight, lengthh);
495
496 info_ptr->valid |= PNG_INFO_sCAL;
497 info_ptr->free_me |= PNG_FREE_SCAL;
498 }
499
500 # ifdef PNG_FLOATING_POINT_SUPPORTED
501 void PNGAPI
png_set_sCAL(png_const_structrp png_ptr,png_inforp info_ptr,int unit,double width,double height)502 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
503 double width, double height)
504 {
505 png_debug1(1, "in %s storage function", "sCAL");
506
507 /* Check the arguments. */
508 if (width <= 0)
509 png_warning(png_ptr, "Invalid sCAL width ignored");
510
511 else if (height <= 0)
512 png_warning(png_ptr, "Invalid sCAL height ignored");
513
514 else
515 {
516 /* Convert 'width' and 'height' to ASCII. */
517 char swidth[PNG_sCAL_MAX_DIGITS+1];
518 char sheight[PNG_sCAL_MAX_DIGITS+1];
519
520 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
521 PNG_sCAL_PRECISION);
522 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
523 PNG_sCAL_PRECISION);
524
525 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
526 }
527 }
528 # endif
529
530 # ifdef PNG_FIXED_POINT_SUPPORTED
531 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)532 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
533 png_fixed_point width, png_fixed_point height)
534 {
535 png_debug1(1, "in %s storage function", "sCAL");
536
537 /* Check the arguments. */
538 if (width <= 0)
539 png_warning(png_ptr, "Invalid sCAL width ignored");
540
541 else if (height <= 0)
542 png_warning(png_ptr, "Invalid sCAL height ignored");
543
544 else
545 {
546 /* Convert 'width' and 'height' to ASCII. */
547 char swidth[PNG_sCAL_MAX_DIGITS+1];
548 char sheight[PNG_sCAL_MAX_DIGITS+1];
549
550 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
551 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
552
553 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
554 }
555 }
556 # endif
557 #endif
558
559 #ifdef PNG_pHYs_SUPPORTED
560 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)561 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
562 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
563 {
564 png_debug1(1, "in %s storage function", "pHYs");
565
566 if (png_ptr == NULL || info_ptr == NULL)
567 return;
568
569 info_ptr->x_pixels_per_unit = res_x;
570 info_ptr->y_pixels_per_unit = res_y;
571 info_ptr->phys_unit_type = (png_byte)unit_type;
572 info_ptr->valid |= PNG_INFO_pHYs;
573 }
574 #endif
575
576 void PNGAPI
png_set_PLTE(png_structrp png_ptr,png_inforp info_ptr,png_const_colorp palette,int num_palette)577 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
578 png_const_colorp palette, int num_palette)
579 {
580
581 png_uint_32 max_palette_length;
582
583 png_debug1(1, "in %s storage function", "PLTE");
584
585 if (png_ptr == NULL || info_ptr == NULL)
586 return;
587
588 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
589 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
590
591 if (num_palette < 0 || num_palette > (int) max_palette_length)
592 {
593 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
594 png_error(png_ptr, "Invalid palette length");
595
596 else
597 {
598 png_warning(png_ptr, "Invalid palette length");
599
600 return;
601 }
602 }
603
604 if ((num_palette > 0 && palette == NULL) ||
605 (num_palette == 0
606 # ifdef PNG_MNG_FEATURES_SUPPORTED
607 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
608 # endif
609 ))
610 {
611 png_error(png_ptr, "Invalid palette");
612 }
613
614 /* It may not actually be necessary to set png_ptr->palette here;
615 * we do it for backward compatibility with the way the png_handle_tRNS
616 * function used to do the allocation.
617 *
618 * 1.6.0: the above statement appears to be incorrect; something has to set
619 * the palette inside png_struct on read.
620 */
621 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
622
623 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
624 * of num_palette entries, in case of an invalid PNG file or incorrect
625 * call to png_set_PLTE() with too-large sample values.
626 */
627 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
628 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
629
630 if (num_palette > 0)
631 memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
632 (sizeof (png_color)));
633 info_ptr->palette = png_ptr->palette;
634 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
635
636 info_ptr->free_me |= PNG_FREE_PLTE;
637
638 info_ptr->valid |= PNG_INFO_PLTE;
639 }
640
641 #ifdef PNG_sBIT_SUPPORTED
642 void PNGAPI
png_set_sBIT(png_const_structrp png_ptr,png_inforp info_ptr,png_const_color_8p sig_bit)643 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
644 png_const_color_8p sig_bit)
645 {
646 png_debug1(1, "in %s storage function", "sBIT");
647
648 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
649 return;
650
651 info_ptr->sig_bit = *sig_bit;
652 info_ptr->valid |= PNG_INFO_sBIT;
653 }
654 #endif
655
656 #ifdef PNG_sRGB_SUPPORTED
657 void PNGAPI
png_set_sRGB(png_const_structrp png_ptr,png_inforp info_ptr,int srgb_intent)658 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
659 {
660 png_debug1(1, "in %s storage function", "sRGB");
661
662 if (png_ptr == NULL || info_ptr == NULL)
663 return;
664
665 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
666 png_colorspace_sync_info(png_ptr, info_ptr);
667 }
668
669 void PNGAPI
png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr,png_inforp info_ptr,int srgb_intent)670 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
671 int srgb_intent)
672 {
673 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
674
675 if (png_ptr == NULL || info_ptr == NULL)
676 return;
677
678 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
679 srgb_intent) != 0)
680 {
681 /* This causes the gAMA and cHRM to be written too */
682 info_ptr->colorspace.flags |=
683 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
684 }
685
686 png_colorspace_sync_info(png_ptr, info_ptr);
687 }
688 #endif /* sRGB */
689
690
691 #ifdef PNG_iCCP_SUPPORTED
692 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)693 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
694 png_const_charp name, int compression_type,
695 png_const_bytep profile, png_uint_32 proflen)
696 {
697 png_charp new_iccp_name;
698 png_bytep new_iccp_profile;
699 size_t length;
700
701 png_debug1(1, "in %s storage function", "iCCP");
702
703 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
704 return;
705
706 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
707 png_app_error(png_ptr, "Invalid iCCP compression method");
708
709 /* Set the colorspace first because this validates the profile; do not
710 * override previously set app cHRM or gAMA here (because likely as not the
711 * application knows better than libpng what the correct values are.) Pass
712 * the info_ptr color_type field to png_colorspace_set_ICC because in the
713 * write case it has not yet been stored in png_ptr.
714 */
715 {
716 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
717 proflen, profile, info_ptr->color_type);
718
719 png_colorspace_sync_info(png_ptr, info_ptr);
720
721 /* Don't do any of the copying if the profile was bad, or inconsistent. */
722 if (result == 0)
723 return;
724
725 /* But do write the gAMA and cHRM chunks from the profile. */
726 info_ptr->colorspace.flags |=
727 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
728 }
729
730 length = strlen(name)+1;
731 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
732
733 if (new_iccp_name == NULL)
734 {
735 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
736
737 return;
738 }
739
740 memcpy(new_iccp_name, name, length);
741 new_iccp_profile = png_voidcast(png_bytep,
742 png_malloc_warn(png_ptr, proflen));
743
744 if (new_iccp_profile == NULL)
745 {
746 png_free(png_ptr, new_iccp_name);
747 png_benign_error(png_ptr,
748 "Insufficient memory to process iCCP profile");
749
750 return;
751 }
752
753 memcpy(new_iccp_profile, profile, proflen);
754
755 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
756
757 info_ptr->iccp_proflen = proflen;
758 info_ptr->iccp_name = new_iccp_name;
759 info_ptr->iccp_profile = new_iccp_profile;
760 info_ptr->free_me |= PNG_FREE_ICCP;
761 info_ptr->valid |= PNG_INFO_iCCP;
762 }
763 #endif
764
765 #ifdef PNG_TEXT_SUPPORTED
766 void PNGAPI
png_set_text(png_const_structrp png_ptr,png_inforp info_ptr,png_const_textp text_ptr,int num_text)767 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
768 png_const_textp text_ptr, int num_text)
769 {
770 int ret;
771 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
772
773 if (ret != 0)
774 png_error(png_ptr, "Insufficient memory to store text");
775 }
776
777 int /* PRIVATE */
png_set_text_2(png_const_structrp png_ptr,png_inforp info_ptr,png_const_textp text_ptr,int num_text)778 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
779 png_const_textp text_ptr, int num_text)
780 {
781 int i;
782
783 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
784 (unsigned long)png_ptr->chunk_name);
785
786 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
787 return(0);
788
789 /* Make sure we have enough space in the "text" array in info_struct
790 * to hold all of the incoming text_ptr objects. This compare can't overflow
791 * because max_text >= num_text (anyway, subtract of two positive integers
792 * can't overflow in any case.)
793 */
794 if (num_text > info_ptr->max_text - info_ptr->num_text)
795 {
796 int old_num_text = info_ptr->num_text;
797 int max_text;
798 png_textp new_text = NULL;
799
800 /* Calculate an appropriate max_text, checking for overflow. */
801 max_text = old_num_text;
802 if (num_text <= INT_MAX - max_text)
803 {
804 max_text += num_text;
805
806 /* Round up to a multiple of 8 */
807 if (max_text < INT_MAX-8)
808 max_text = (max_text + 8) & ~0x7;
809
810 else
811 max_text = INT_MAX;
812
813 /* Now allocate a new array and copy the old members in; this does all
814 * the overflow checks.
815 */
816 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
817 info_ptr->text, old_num_text, max_text-old_num_text,
818 sizeof *new_text));
819 }
820
821 if (new_text == NULL)
822 {
823 png_chunk_report(png_ptr, "too many text chunks",
824 PNG_CHUNK_WRITE_ERROR);
825
826 return 1;
827 }
828
829 png_free(png_ptr, info_ptr->text);
830
831 info_ptr->text = new_text;
832 info_ptr->free_me |= PNG_FREE_TEXT;
833 info_ptr->max_text = max_text;
834 /* num_text is adjusted below as the entries are copied in */
835
836 png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
837 }
838
839 for (i = 0; i < num_text; i++)
840 {
841 size_t text_length, key_len;
842 size_t lang_len, lang_key_len;
843 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
844
845 if (text_ptr[i].key == NULL)
846 continue;
847
848 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
849 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
850 {
851 png_chunk_report(png_ptr, "text compression mode is out of range",
852 PNG_CHUNK_WRITE_ERROR);
853 continue;
854 }
855
856 key_len = strlen(text_ptr[i].key);
857
858 if (text_ptr[i].compression <= 0)
859 {
860 lang_len = 0;
861 lang_key_len = 0;
862 }
863
864 else
865 # ifdef PNG_iTXt_SUPPORTED
866 {
867 /* Set iTXt data */
868
869 if (text_ptr[i].lang != NULL)
870 lang_len = strlen(text_ptr[i].lang);
871
872 else
873 lang_len = 0;
874
875 if (text_ptr[i].lang_key != NULL)
876 lang_key_len = strlen(text_ptr[i].lang_key);
877
878 else
879 lang_key_len = 0;
880 }
881 # else /* iTXt */
882 {
883 png_chunk_report(png_ptr, "iTXt chunk not supported",
884 PNG_CHUNK_WRITE_ERROR);
885 continue;
886 }
887 # endif
888
889 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
890 {
891 text_length = 0;
892 # ifdef PNG_iTXt_SUPPORTED
893 if (text_ptr[i].compression > 0)
894 textp->compression = PNG_ITXT_COMPRESSION_NONE;
895
896 else
897 # endif
898 textp->compression = PNG_TEXT_COMPRESSION_NONE;
899 }
900
901 else
902 {
903 text_length = strlen(text_ptr[i].text);
904 textp->compression = text_ptr[i].compression;
905 }
906
907 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
908 key_len + text_length + lang_len + lang_key_len + 4));
909
910 if (textp->key == NULL)
911 {
912 png_chunk_report(png_ptr, "text chunk: out of memory",
913 PNG_CHUNK_WRITE_ERROR);
914
915 return 1;
916 }
917
918 png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
919 (unsigned long)(png_uint_32)
920 (key_len + lang_len + lang_key_len + text_length + 4),
921 textp->key);
922
923 memcpy(textp->key, text_ptr[i].key, key_len);
924 *(textp->key + key_len) = '\0';
925
926 if (text_ptr[i].compression > 0)
927 {
928 textp->lang = textp->key + key_len + 1;
929 memcpy(textp->lang, text_ptr[i].lang, lang_len);
930 *(textp->lang + lang_len) = '\0';
931 textp->lang_key = textp->lang + lang_len + 1;
932 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
933 *(textp->lang_key + lang_key_len) = '\0';
934 textp->text = textp->lang_key + lang_key_len + 1;
935 }
936
937 else
938 {
939 textp->lang=NULL;
940 textp->lang_key=NULL;
941 textp->text = textp->key + key_len + 1;
942 }
943
944 if (text_length != 0)
945 memcpy(textp->text, text_ptr[i].text, text_length);
946
947 *(textp->text + text_length) = '\0';
948
949 # ifdef PNG_iTXt_SUPPORTED
950 if (textp->compression > 0)
951 {
952 textp->text_length = 0;
953 textp->itxt_length = text_length;
954 }
955
956 else
957 # endif
958 {
959 textp->text_length = text_length;
960 textp->itxt_length = 0;
961 }
962
963 info_ptr->num_text++;
964 png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
965 }
966
967 return(0);
968 }
969 #endif
970
971 #ifdef PNG_tIME_SUPPORTED
972 void PNGAPI
png_set_tIME(png_const_structrp png_ptr,png_inforp info_ptr,png_const_timep mod_time)973 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
974 png_const_timep mod_time)
975 {
976 png_debug1(1, "in %s storage function", "tIME");
977
978 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
979 (png_ptr->mode & PNG_WROTE_tIME) != 0)
980 return;
981
982 if (mod_time->month == 0 || mod_time->month > 12 ||
983 mod_time->day == 0 || mod_time->day > 31 ||
984 mod_time->hour > 23 || mod_time->minute > 59 ||
985 mod_time->second > 60)
986 {
987 png_warning(png_ptr, "Ignoring invalid time value");
988
989 return;
990 }
991
992 info_ptr->mod_time = *mod_time;
993 info_ptr->valid |= PNG_INFO_tIME;
994 }
995 #endif
996
997 #ifdef PNG_tRNS_SUPPORTED
998 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)999 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
1000 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
1001 {
1002 png_debug1(1, "in %s storage function", "tRNS");
1003
1004 if (png_ptr == NULL || info_ptr == NULL)
1005
1006 return;
1007
1008 if (trans_alpha != NULL)
1009 {
1010 /* It may not actually be necessary to set png_ptr->trans_alpha here;
1011 * we do it for backward compatibility with the way the png_handle_tRNS
1012 * function used to do the allocation.
1013 *
1014 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
1015 * relies on png_set_tRNS storing the information in png_struct
1016 * (otherwise it won't be there for the code in pngrtran.c).
1017 */
1018
1019 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
1020
1021 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
1022 {
1023 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
1024 info_ptr->trans_alpha = png_voidcast(png_bytep,
1025 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
1026 memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
1027 }
1028 png_ptr->trans_alpha = info_ptr->trans_alpha;
1029 }
1030
1031 if (trans_color != NULL)
1032 {
1033 #ifdef PNG_WARNINGS_SUPPORTED
1034 if (info_ptr->bit_depth < 16)
1035 {
1036 int sample_max = (1 << info_ptr->bit_depth) - 1;
1037
1038 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
1039 trans_color->gray > sample_max) ||
1040 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
1041 (trans_color->red > sample_max ||
1042 trans_color->green > sample_max ||
1043 trans_color->blue > sample_max)))
1044 png_warning(png_ptr,
1045 "tRNS chunk has out-of-range samples for bit_depth");
1046 }
1047 #endif
1048
1049 info_ptr->trans_color = *trans_color;
1050
1051 if (num_trans == 0)
1052 num_trans = 1;
1053 }
1054
1055 info_ptr->num_trans = (png_uint_16)num_trans;
1056
1057 if (num_trans != 0)
1058 {
1059 info_ptr->valid |= PNG_INFO_tRNS;
1060 info_ptr->free_me |= PNG_FREE_TRNS;
1061 }
1062 }
1063 #endif
1064
1065 #ifdef PNG_sPLT_SUPPORTED
1066 void PNGAPI
png_set_sPLT(png_const_structrp png_ptr,png_inforp info_ptr,png_const_sPLT_tp entries,int nentries)1067 png_set_sPLT(png_const_structrp png_ptr,
1068 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1069 /*
1070 * entries - array of png_sPLT_t structures
1071 * to be added to the list of palettes
1072 * in the info structure.
1073 *
1074 * nentries - number of palette structures to be
1075 * added.
1076 */
1077 {
1078 png_sPLT_tp np;
1079
1080 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1081 return;
1082
1083 /* Use the internal realloc function, which checks for all the possible
1084 * overflows. Notice that the parameters are (int) and (size_t)
1085 */
1086 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1087 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1088 sizeof *np));
1089
1090 if (np == NULL)
1091 {
1092 /* Out of memory or too many chunks */
1093 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1094
1095 return;
1096 }
1097
1098 png_free(png_ptr, info_ptr->splt_palettes);
1099 info_ptr->splt_palettes = np;
1100 info_ptr->free_me |= PNG_FREE_SPLT;
1101
1102 np += info_ptr->splt_palettes_num;
1103
1104 do
1105 {
1106 size_t length;
1107
1108 /* Skip invalid input entries */
1109 if (entries->name == NULL || entries->entries == NULL)
1110 {
1111 /* png_handle_sPLT doesn't do this, so this is an app error */
1112 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1113 /* Just skip the invalid entry */
1114 continue;
1115 }
1116
1117 np->depth = entries->depth;
1118
1119 /* In the event of out-of-memory just return - there's no point keeping
1120 * on trying to add sPLT chunks.
1121 */
1122 length = strlen(entries->name) + 1;
1123 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1124
1125 if (np->name == NULL)
1126 break;
1127
1128 memcpy(np->name, entries->name, length);
1129
1130 /* IMPORTANT: we have memory now that won't get freed if something else
1131 * goes wrong; this code must free it. png_malloc_array produces no
1132 * warnings; use a png_chunk_report (below) if there is an error.
1133 */
1134 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1135 entries->nentries, sizeof (png_sPLT_entry)));
1136
1137 if (np->entries == NULL)
1138 {
1139 png_free(png_ptr, np->name);
1140 np->name = NULL;
1141 break;
1142 }
1143
1144 np->nentries = entries->nentries;
1145 /* This multiply can't overflow because png_malloc_array has already
1146 * checked it when doing the allocation.
1147 */
1148 memcpy(np->entries, entries->entries,
1149 (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
1150
1151 /* Note that 'continue' skips the advance of the out pointer and out
1152 * count, so an invalid entry is not added.
1153 */
1154 info_ptr->valid |= PNG_INFO_sPLT;
1155 ++(info_ptr->splt_palettes_num);
1156 ++np;
1157 ++entries;
1158 }
1159 while (--nentries);
1160
1161 if (nentries > 0)
1162 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1163 }
1164 #endif /* sPLT */
1165
1166 #ifdef PNG_APNG_SUPPORTED
1167 png_uint_32 PNGAPI
png_set_acTL(png_structp png_ptr,png_infop info_ptr,png_uint_32 num_frames,png_uint_32 num_plays)1168 png_set_acTL(png_structp png_ptr, png_infop info_ptr,
1169 png_uint_32 num_frames, png_uint_32 num_plays)
1170 {
1171 png_debug1(1, "in %s storage function", "acTL");
1172
1173 if (png_ptr == NULL || info_ptr == NULL)
1174 {
1175 png_warning(png_ptr,
1176 "Call to png_set_acTL() with NULL png_ptr "
1177 "or info_ptr ignored");
1178 return (0);
1179 }
1180 if (num_frames == 0)
1181 {
1182 png_warning(png_ptr,
1183 "Ignoring attempt to set acTL with num_frames zero");
1184 return (0);
1185 }
1186 if (num_frames > PNG_UINT_31_MAX)
1187 {
1188 png_warning(png_ptr,
1189 "Ignoring attempt to set acTL with num_frames > 2^31-1");
1190 return (0);
1191 }
1192 if (num_plays > PNG_UINT_31_MAX)
1193 {
1194 png_warning(png_ptr,
1195 "Ignoring attempt to set acTL with num_plays > 2^31-1");
1196 return (0);
1197 }
1198
1199 info_ptr->num_frames = num_frames;
1200 info_ptr->num_plays = num_plays;
1201
1202 info_ptr->valid |= PNG_INFO_acTL;
1203
1204 return (1);
1205 }
1206
1207 /* delay_num and delay_den can hold any 16-bit values including zero */
1208 png_uint_32 PNGAPI
png_set_next_frame_fcTL(png_structp png_ptr,png_infop info_ptr,png_uint_32 width,png_uint_32 height,png_uint_32 x_offset,png_uint_32 y_offset,png_uint_16 delay_num,png_uint_16 delay_den,png_byte dispose_op,png_byte blend_op)1209 png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
1210 png_uint_32 width, png_uint_32 height,
1211 png_uint_32 x_offset, png_uint_32 y_offset,
1212 png_uint_16 delay_num, png_uint_16 delay_den,
1213 png_byte dispose_op, png_byte blend_op)
1214 {
1215 png_debug1(1, "in %s storage function", "fcTL");
1216
1217 if (png_ptr == NULL || info_ptr == NULL)
1218 {
1219 png_warning(png_ptr,
1220 "Call to png_set_fcTL() with NULL png_ptr or info_ptr "
1221 "ignored");
1222 return (0);
1223 }
1224
1225 png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
1226 delay_num, delay_den, dispose_op, blend_op);
1227
1228 if (blend_op == PNG_BLEND_OP_OVER)
1229 {
1230 if ((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) == 0 &&
1231 png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) == 0)
1232 {
1233 png_warning(png_ptr, "PNG_BLEND_OP_OVER is meaningless "
1234 "and wasteful for opaque images, ignored");
1235 blend_op = PNG_BLEND_OP_SOURCE;
1236 }
1237 }
1238
1239 info_ptr->next_frame_width = width;
1240 info_ptr->next_frame_height = height;
1241 info_ptr->next_frame_x_offset = x_offset;
1242 info_ptr->next_frame_y_offset = y_offset;
1243 info_ptr->next_frame_delay_num = delay_num;
1244 info_ptr->next_frame_delay_den = delay_den;
1245 info_ptr->next_frame_dispose_op = dispose_op;
1246 info_ptr->next_frame_blend_op = blend_op;
1247
1248 info_ptr->valid |= PNG_INFO_fcTL;
1249
1250 return (1);
1251 }
1252
1253 void /* PRIVATE */
png_ensure_fcTL_is_valid(png_structp png_ptr,png_uint_32 width,png_uint_32 height,png_uint_32 x_offset,png_uint_32 y_offset,png_uint_16 delay_num,png_uint_16 delay_den,png_byte dispose_op,png_byte blend_op)1254 png_ensure_fcTL_is_valid(png_structp png_ptr,
1255 png_uint_32 width, png_uint_32 height,
1256 png_uint_32 x_offset, png_uint_32 y_offset,
1257 png_uint_16 delay_num, png_uint_16 delay_den,
1258 png_byte dispose_op, png_byte blend_op)
1259 {
1260 if (width == 0 || width > PNG_UINT_31_MAX)
1261 png_error(png_ptr, "invalid width in fcTL (0 or > 2^31-1)");
1262 if (height == 0 || height > PNG_UINT_31_MAX)
1263 png_error(png_ptr, "invalid height in fcTL (0 or > 2^31-1)");
1264 if (x_offset > PNG_UINT_31_MAX)
1265 png_error(png_ptr, "invalid x_offset in fcTL (> 2^31-1)");
1266 if (y_offset > PNG_UINT_31_MAX)
1267 png_error(png_ptr, "invalid y_offset in fcTL (> 2^31-1)");
1268 if (width + x_offset > png_ptr->first_frame_width ||
1269 height + y_offset > png_ptr->first_frame_height)
1270 png_error(png_ptr, "dimensions of a frame are greater than "
1271 "the ones in IHDR");
1272
1273 if (dispose_op != PNG_DISPOSE_OP_NONE &&
1274 dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
1275 dispose_op != PNG_DISPOSE_OP_PREVIOUS)
1276 png_error(png_ptr, "invalid dispose_op in fcTL");
1277
1278 if (blend_op != PNG_BLEND_OP_SOURCE &&
1279 blend_op != PNG_BLEND_OP_OVER)
1280 png_error(png_ptr, "invalid blend_op in fcTL");
1281
1282 PNG_UNUSED(delay_num)
1283 PNG_UNUSED(delay_den)
1284 }
1285
1286 png_uint_32 PNGAPI
png_set_first_frame_is_hidden(png_structp png_ptr,png_infop info_ptr,png_byte is_hidden)1287 png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
1288 png_byte is_hidden)
1289 {
1290 png_debug(1, "in png_first_frame_is_hidden()");
1291
1292 if (png_ptr == NULL)
1293 return 0;
1294
1295 if (is_hidden != 0)
1296 png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
1297 else
1298 png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
1299
1300 PNG_UNUSED(info_ptr)
1301
1302 return 1;
1303 }
1304 #endif /* APNG */
1305
1306 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1307 static png_byte
check_location(png_const_structrp png_ptr,int location)1308 check_location(png_const_structrp png_ptr, int location)
1309 {
1310 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1311
1312 /* New in 1.6.0; copy the location and check it. This is an API
1313 * change; previously the app had to use the
1314 * png_set_unknown_chunk_location API below for each chunk.
1315 */
1316 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1317 {
1318 /* Write struct, so unknown chunks come from the app */
1319 png_app_warning(png_ptr,
1320 "png_set_unknown_chunks now expects a valid location");
1321 /* Use the old behavior */
1322 location = (png_byte)(png_ptr->mode &
1323 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1324 }
1325
1326 /* This need not be an internal error - if the app calls
1327 * png_set_unknown_chunks on a read pointer it must get the location right.
1328 */
1329 if (location == 0)
1330 png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1331
1332 /* Now reduce the location to the top-most set bit by removing each least
1333 * significant bit in turn.
1334 */
1335 while (location != (location & -location))
1336 location &= ~(location & -location);
1337
1338 /* The cast is safe because 'location' is a bit mask and only the low four
1339 * bits are significant.
1340 */
1341 return (png_byte)location;
1342 }
1343
1344 void PNGAPI
png_set_unknown_chunks(png_const_structrp png_ptr,png_inforp info_ptr,png_const_unknown_chunkp unknowns,int num_unknowns)1345 png_set_unknown_chunks(png_const_structrp png_ptr,
1346 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1347 {
1348 png_unknown_chunkp np;
1349
1350 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1351 unknowns == NULL)
1352 return;
1353
1354 /* Check for the failure cases where support has been disabled at compile
1355 * time. This code is hardly ever compiled - it's here because
1356 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1357 * code) but may be meaningless if the read or write handling of unknown
1358 * chunks is not compiled in.
1359 */
1360 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1361 defined(PNG_READ_SUPPORTED)
1362 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1363 {
1364 png_app_error(png_ptr, "no unknown chunk support on read");
1365
1366 return;
1367 }
1368 # endif
1369 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1370 defined(PNG_WRITE_SUPPORTED)
1371 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1372 {
1373 png_app_error(png_ptr, "no unknown chunk support on write");
1374
1375 return;
1376 }
1377 # endif
1378
1379 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1380 * unknown critical chunks could be lost with just a warning resulting in
1381 * undefined behavior. Now png_chunk_report is used to provide behavior
1382 * appropriate to read or write.
1383 */
1384 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1385 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1386 sizeof *np));
1387
1388 if (np == NULL)
1389 {
1390 png_chunk_report(png_ptr, "too many unknown chunks",
1391 PNG_CHUNK_WRITE_ERROR);
1392
1393 return;
1394 }
1395
1396 png_free(png_ptr, info_ptr->unknown_chunks);
1397 info_ptr->unknown_chunks = np; /* safe because it is initialized */
1398 info_ptr->free_me |= PNG_FREE_UNKN;
1399
1400 np += info_ptr->unknown_chunks_num;
1401
1402 /* Increment unknown_chunks_num each time round the loop to protect the
1403 * just-allocated chunk data.
1404 */
1405 for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1406 {
1407 memcpy(np->name, unknowns->name, (sizeof np->name));
1408 np->name[(sizeof np->name)-1] = '\0';
1409 np->location = check_location(png_ptr, unknowns->location);
1410
1411 if (unknowns->size == 0)
1412 {
1413 np->data = NULL;
1414 np->size = 0;
1415 }
1416
1417 else
1418 {
1419 np->data = png_voidcast(png_bytep,
1420 png_malloc_base(png_ptr, unknowns->size));
1421
1422 if (np->data == NULL)
1423 {
1424 png_chunk_report(png_ptr, "unknown chunk: out of memory",
1425 PNG_CHUNK_WRITE_ERROR);
1426 /* But just skip storing the unknown chunk */
1427 continue;
1428 }
1429
1430 memcpy(np->data, unknowns->data, unknowns->size);
1431 np->size = unknowns->size;
1432 }
1433
1434 /* These increments are skipped on out-of-memory for the data - the
1435 * unknown chunk entry gets overwritten if the png_chunk_report returns.
1436 * This is correct in the read case (the chunk is just dropped.)
1437 */
1438 ++np;
1439 ++(info_ptr->unknown_chunks_num);
1440 }
1441 }
1442
1443 void PNGAPI
png_set_unknown_chunk_location(png_const_structrp png_ptr,png_inforp info_ptr,int chunk,int location)1444 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1445 int chunk, int location)
1446 {
1447 /* This API is pretty pointless in 1.6.0 because the location can be set
1448 * before the call to png_set_unknown_chunks.
1449 *
1450 * TODO: add a png_app_warning in 1.7
1451 */
1452 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1453 chunk < info_ptr->unknown_chunks_num)
1454 {
1455 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1456 {
1457 png_app_error(png_ptr, "invalid unknown chunk location");
1458 /* Fake out the pre 1.6.0 behavior: */
1459 if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1460 location = PNG_AFTER_IDAT;
1461
1462 else
1463 location = PNG_HAVE_IHDR; /* also undocumented */
1464 }
1465
1466 info_ptr->unknown_chunks[chunk].location =
1467 check_location(png_ptr, location);
1468 }
1469 }
1470 #endif /* STORE_UNKNOWN_CHUNKS */
1471
1472 #ifdef PNG_MNG_FEATURES_SUPPORTED
1473 png_uint_32 PNGAPI
png_permit_mng_features(png_structrp png_ptr,png_uint_32 mng_features)1474 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1475 {
1476 png_debug(1, "in png_permit_mng_features");
1477
1478 if (png_ptr == NULL)
1479 return 0;
1480
1481 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1482
1483 return png_ptr->mng_features_permitted;
1484 }
1485 #endif
1486
1487 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1488 static unsigned int
add_one_chunk(png_bytep list,unsigned int count,png_const_bytep add,int keep)1489 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1490 {
1491 unsigned int i;
1492
1493 /* Utility function: update the 'keep' state of a chunk if it is already in
1494 * the list, otherwise add it to the list.
1495 */
1496 for (i=0; i<count; ++i, list += 5)
1497 {
1498 if (memcmp(list, add, 4) == 0)
1499 {
1500 list[4] = (png_byte)keep;
1501
1502 return count;
1503 }
1504 }
1505
1506 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1507 {
1508 ++count;
1509 memcpy(list, add, 4);
1510 list[4] = (png_byte)keep;
1511 }
1512
1513 return count;
1514 }
1515
1516 void PNGAPI
png_set_keep_unknown_chunks(png_structrp png_ptr,int keep,png_const_bytep chunk_list,int num_chunks_in)1517 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1518 png_const_bytep chunk_list, int num_chunks_in)
1519 {
1520 png_bytep new_list;
1521 unsigned int num_chunks, old_num_chunks;
1522
1523 if (png_ptr == NULL)
1524 return;
1525
1526 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1527 {
1528 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1529
1530 return;
1531 }
1532
1533 if (num_chunks_in <= 0)
1534 {
1535 png_ptr->unknown_default = keep;
1536
1537 /* '0' means just set the flags, so stop here */
1538 if (num_chunks_in == 0)
1539 return;
1540 }
1541
1542 if (num_chunks_in < 0)
1543 {
1544 /* Ignore all unknown chunks and all chunks recognized by
1545 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1546 */
1547 static const png_byte chunks_to_ignore[] = {
1548 98, 75, 71, 68, '\0', /* bKGD */
1549 99, 72, 82, 77, '\0', /* cHRM */
1550 101, 88, 73, 102, '\0', /* eXIf */
1551 103, 65, 77, 65, '\0', /* gAMA */
1552 104, 73, 83, 84, '\0', /* hIST */
1553 105, 67, 67, 80, '\0', /* iCCP */
1554 105, 84, 88, 116, '\0', /* iTXt */
1555 111, 70, 70, 115, '\0', /* oFFs */
1556 112, 67, 65, 76, '\0', /* pCAL */
1557 112, 72, 89, 115, '\0', /* pHYs */
1558 115, 66, 73, 84, '\0', /* sBIT */
1559 115, 67, 65, 76, '\0', /* sCAL */
1560 115, 80, 76, 84, '\0', /* sPLT */
1561 115, 84, 69, 82, '\0', /* sTER */
1562 115, 82, 71, 66, '\0', /* sRGB */
1563 116, 69, 88, 116, '\0', /* tEXt */
1564 116, 73, 77, 69, '\0', /* tIME */
1565 122, 84, 88, 116, '\0' /* zTXt */
1566 };
1567
1568 chunk_list = chunks_to_ignore;
1569 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1570 }
1571
1572 else /* num_chunks_in > 0 */
1573 {
1574 if (chunk_list == NULL)
1575 {
1576 /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1577 * which can be switched off.
1578 */
1579 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1580
1581 return;
1582 }
1583
1584 num_chunks = (unsigned int)num_chunks_in;
1585 }
1586
1587 old_num_chunks = png_ptr->num_chunk_list;
1588 if (png_ptr->chunk_list == NULL)
1589 old_num_chunks = 0;
1590
1591 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1592 */
1593 if (num_chunks + old_num_chunks > UINT_MAX/5)
1594 {
1595 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1596
1597 return;
1598 }
1599
1600 /* If these chunks are being reset to the default then no more memory is
1601 * required because add_one_chunk above doesn't extend the list if the 'keep'
1602 * parameter is the default.
1603 */
1604 if (keep != 0)
1605 {
1606 new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1607 5 * (num_chunks + old_num_chunks)));
1608
1609 if (old_num_chunks > 0)
1610 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1611 }
1612
1613 else if (old_num_chunks > 0)
1614 new_list = png_ptr->chunk_list;
1615
1616 else
1617 new_list = NULL;
1618
1619 /* Add the new chunks together with each one's handling code. If the chunk
1620 * already exists the code is updated, otherwise the chunk is added to the
1621 * end. (In libpng 1.6.0 order no longer matters because this code enforces
1622 * the earlier convention that the last setting is the one that is used.)
1623 */
1624 if (new_list != NULL)
1625 {
1626 png_const_bytep inlist;
1627 png_bytep outlist;
1628 unsigned int i;
1629
1630 for (i=0; i<num_chunks; ++i)
1631 {
1632 old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1633 chunk_list+5*i, keep);
1634 }
1635
1636 /* Now remove any spurious 'default' entries. */
1637 num_chunks = 0;
1638 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1639 {
1640 if (inlist[4])
1641 {
1642 if (outlist != inlist)
1643 memcpy(outlist, inlist, 5);
1644 outlist += 5;
1645 ++num_chunks;
1646 }
1647 }
1648
1649 /* This means the application has removed all the specialized handling. */
1650 if (num_chunks == 0)
1651 {
1652 if (png_ptr->chunk_list != new_list)
1653 png_free(png_ptr, new_list);
1654
1655 new_list = NULL;
1656 }
1657 }
1658
1659 else
1660 num_chunks = 0;
1661
1662 png_ptr->num_chunk_list = num_chunks;
1663
1664 if (png_ptr->chunk_list != new_list)
1665 {
1666 if (png_ptr->chunk_list != NULL)
1667 png_free(png_ptr, png_ptr->chunk_list);
1668
1669 png_ptr->chunk_list = new_list;
1670 }
1671 }
1672 #endif
1673
1674 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1675 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)1676 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1677 png_user_chunk_ptr read_user_chunk_fn)
1678 {
1679 png_debug(1, "in png_set_read_user_chunk_fn");
1680
1681 if (png_ptr == NULL)
1682 return;
1683
1684 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1685 png_ptr->user_chunk_ptr = user_chunk_ptr;
1686 }
1687 #endif
1688
1689 #ifdef PNG_INFO_IMAGE_SUPPORTED
1690 void PNGAPI
png_set_rows(png_const_structrp png_ptr,png_inforp info_ptr,png_bytepp row_pointers)1691 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1692 png_bytepp row_pointers)
1693 {
1694 png_debug1(1, "in %s storage function", "rows");
1695
1696 if (png_ptr == NULL || info_ptr == NULL)
1697 return;
1698
1699 if (info_ptr->row_pointers != NULL &&
1700 (info_ptr->row_pointers != row_pointers))
1701 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1702
1703 info_ptr->row_pointers = row_pointers;
1704
1705 if (row_pointers != NULL)
1706 info_ptr->valid |= PNG_INFO_IDAT;
1707 }
1708 #endif
1709
1710 void PNGAPI
png_set_compression_buffer_size(png_structrp png_ptr,size_t size)1711 png_set_compression_buffer_size(png_structrp png_ptr, size_t size)
1712 {
1713 if (png_ptr == NULL)
1714 return;
1715
1716 if (size == 0 || size > PNG_UINT_31_MAX)
1717 png_error(png_ptr, "invalid compression buffer size");
1718
1719 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1720 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1721 {
1722 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1723 return;
1724 }
1725 # endif
1726
1727 # ifdef PNG_WRITE_SUPPORTED
1728 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1729 {
1730 if (png_ptr->zowner != 0)
1731 {
1732 png_warning(png_ptr,
1733 "Compression buffer size cannot be changed because it is in use");
1734
1735 return;
1736 }
1737
1738 #ifndef __COVERITY__
1739 /* Some compilers complain that this is always false. However, it
1740 * can be true when integer overflow happens.
1741 */
1742 if (size > ZLIB_IO_MAX)
1743 {
1744 png_warning(png_ptr,
1745 "Compression buffer size limited to system maximum");
1746 size = ZLIB_IO_MAX; /* must fit */
1747 }
1748 #endif
1749
1750 if (size < 6)
1751 {
1752 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1753 * if this is permitted.
1754 */
1755 png_warning(png_ptr,
1756 "Compression buffer size cannot be reduced below 6");
1757
1758 return;
1759 }
1760
1761 if (png_ptr->zbuffer_size != size)
1762 {
1763 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1764 png_ptr->zbuffer_size = (uInt)size;
1765 }
1766 }
1767 # endif
1768 }
1769
1770 void PNGAPI
png_set_invalid(png_const_structrp png_ptr,png_inforp info_ptr,int mask)1771 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1772 {
1773 if (png_ptr != NULL && info_ptr != NULL)
1774 info_ptr->valid &= (unsigned int)(~mask);
1775 }
1776
1777
1778 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1779 /* This function was added to libpng 1.2.6 */
1780 void PNGAPI
png_set_user_limits(png_structrp png_ptr,png_uint_32 user_width_max,png_uint_32 user_height_max)1781 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1782 png_uint_32 user_height_max)
1783 {
1784 /* Images with dimensions larger than these limits will be
1785 * rejected by png_set_IHDR(). To accept any PNG datastream
1786 * regardless of dimensions, set both limits to 0x7fffffff.
1787 */
1788 if (png_ptr == NULL)
1789 return;
1790
1791 png_ptr->user_width_max = user_width_max;
1792 png_ptr->user_height_max = user_height_max;
1793 }
1794
1795 /* This function was added to libpng 1.4.0 */
1796 void PNGAPI
png_set_chunk_cache_max(png_structrp png_ptr,png_uint_32 user_chunk_cache_max)1797 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1798 {
1799 if (png_ptr != NULL)
1800 png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1801 }
1802
1803 /* This function was added to libpng 1.4.1 */
1804 void PNGAPI
png_set_chunk_malloc_max(png_structrp png_ptr,png_alloc_size_t user_chunk_malloc_max)1805 png_set_chunk_malloc_max (png_structrp png_ptr,
1806 png_alloc_size_t user_chunk_malloc_max)
1807 {
1808 if (png_ptr != NULL)
1809 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1810 }
1811 #endif /* ?SET_USER_LIMITS */
1812
1813
1814 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1815 void PNGAPI
png_set_benign_errors(png_structrp png_ptr,int allowed)1816 png_set_benign_errors(png_structrp png_ptr, int allowed)
1817 {
1818 png_debug(1, "in png_set_benign_errors");
1819
1820 /* If allowed is 1, png_benign_error() is treated as a warning.
1821 *
1822 * If allowed is 0, png_benign_error() is treated as an error (which
1823 * is the default behavior if png_set_benign_errors() is not called).
1824 */
1825
1826 if (allowed != 0)
1827 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1828 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1829
1830 else
1831 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1832 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1833 }
1834 #endif /* BENIGN_ERRORS */
1835
1836 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1837 /* Whether to report invalid palette index; added at libng-1.5.10.
1838 * It is possible for an indexed (color-type==3) PNG file to contain
1839 * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1840 * fewer entries than the image's bit-depth would allow. We recover
1841 * from this gracefully by filling any incomplete palette with zeros
1842 * (opaque black). By default, when this occurs libpng will issue
1843 * a benign error. This API can be used to override that behavior.
1844 */
1845 void PNGAPI
png_set_check_for_invalid_index(png_structrp png_ptr,int allowed)1846 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1847 {
1848 png_debug(1, "in png_set_check_for_invalid_index");
1849
1850 if (allowed > 0)
1851 png_ptr->num_palette_max = 0;
1852
1853 else
1854 png_ptr->num_palette_max = -1;
1855 }
1856 #endif
1857
1858 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1859 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1860 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1861 * and if invalid, correct the keyword rather than discarding the entire
1862 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1863 * length, forbids leading or trailing whitespace, multiple internal spaces,
1864 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1865 *
1866 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1867 * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1868 * valid one could not be generated, and the caller must png_error.
1869 */
1870 png_uint_32 /* PRIVATE */
png_check_keyword(png_structrp png_ptr,png_const_charp key,png_bytep new_key)1871 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1872 {
1873 #ifdef PNG_WARNINGS_SUPPORTED
1874 png_const_charp orig_key = key;
1875 #endif
1876 png_uint_32 key_len = 0;
1877 int bad_character = 0;
1878 int space = 1;
1879
1880 png_debug(1, "in png_check_keyword");
1881
1882 if (key == NULL)
1883 {
1884 *new_key = 0;
1885 return 0;
1886 }
1887
1888 while (*key && key_len < 79)
1889 {
1890 png_byte ch = (png_byte)*key++;
1891
1892 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1893 {
1894 *new_key++ = ch; ++key_len; space = 0;
1895 }
1896
1897 else if (space == 0)
1898 {
1899 /* A space or an invalid character when one wasn't seen immediately
1900 * before; output just a space.
1901 */
1902 *new_key++ = 32; ++key_len; space = 1;
1903
1904 /* If the character was not a space then it is invalid. */
1905 if (ch != 32)
1906 bad_character = ch;
1907 }
1908
1909 else if (bad_character == 0)
1910 bad_character = ch; /* just skip it, record the first error */
1911 }
1912
1913 if (key_len > 0 && space != 0) /* trailing space */
1914 {
1915 --key_len; --new_key;
1916 if (bad_character == 0)
1917 bad_character = 32;
1918 }
1919
1920 /* Terminate the keyword */
1921 *new_key = 0;
1922
1923 if (key_len == 0)
1924 return 0;
1925
1926 #ifdef PNG_WARNINGS_SUPPORTED
1927 /* Try to only output one warning per keyword: */
1928 if (*key != 0) /* keyword too long */
1929 png_warning(png_ptr, "keyword truncated");
1930
1931 else if (bad_character != 0)
1932 {
1933 PNG_WARNING_PARAMETERS(p)
1934
1935 png_warning_parameter(p, 1, orig_key);
1936 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1937
1938 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1939 }
1940 #else /* !WARNINGS */
1941 PNG_UNUSED(png_ptr)
1942 #endif /* !WARNINGS */
1943
1944 return key_len;
1945 }
1946 #endif /* TEXT || pCAL || iCCP || sPLT */
1947 #endif /* READ || WRITE */
1948