Line data Source code
1 :
2 : /* pngset.c - storage of image information into info struct
3 : *
4 : * Last changed in libpng 1.6.26 [October 20, 2016]
5 : * Copyright (c) 1998-2016 Glenn Randers-Pehrson
6 : * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 : * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 : *
9 : * This code is released under the libpng license.
10 : * For conditions of distribution and use, see the disclaimer
11 : * and license in png.h
12 : *
13 : * The functions here are used during reads to store data from the file
14 : * into the info struct, and during writes to store application data
15 : * into the info struct for writing into the file. This abstracts the
16 : * info struct and allows us to change the structure in the future.
17 : */
18 :
19 : #include "pngpriv.h"
20 :
21 : #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
22 :
23 : #ifdef PNG_bKGD_SUPPORTED
24 : void PNGAPI
25 : png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
26 : png_const_color_16p background)
27 : {
28 : png_debug1(1, "in %s storage function", "bKGD");
29 :
30 : if (png_ptr == NULL || info_ptr == NULL || background == NULL)
31 : return;
32 :
33 : info_ptr->background = *background;
34 : info_ptr->valid |= PNG_INFO_bKGD;
35 : }
36 : #endif
37 :
38 : #ifdef PNG_cHRM_SUPPORTED
39 : void PNGFAPI
40 0 : 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 0 : if (png_ptr == NULL || info_ptr == NULL)
50 0 : return;
51 :
52 0 : xy.redx = red_x;
53 0 : xy.redy = red_y;
54 0 : xy.greenx = green_x;
55 0 : xy.greeny = green_y;
56 0 : xy.bluex = blue_x;
57 0 : xy.bluey = blue_y;
58 0 : xy.whitex = white_x;
59 0 : xy.whitey = white_y;
60 :
61 0 : if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
62 : 2/* override with app values*/) != 0)
63 0 : info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
64 :
65 0 : png_colorspace_sync_info(png_ptr, info_ptr);
66 : }
67 :
68 : void PNGFAPI
69 0 : 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 0 : if (png_ptr == NULL || info_ptr == NULL)
81 0 : return;
82 :
83 0 : XYZ.red_X = int_red_X;
84 0 : XYZ.red_Y = int_red_Y;
85 0 : XYZ.red_Z = int_red_Z;
86 0 : XYZ.green_X = int_green_X;
87 0 : XYZ.green_Y = int_green_Y;
88 0 : XYZ.green_Z = int_green_Z;
89 0 : XYZ.blue_X = int_blue_X;
90 0 : XYZ.blue_Y = int_blue_Y;
91 0 : XYZ.blue_Z = int_blue_Z;
92 :
93 0 : if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace,
94 : &XYZ, 2) != 0)
95 0 : info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
96 :
97 0 : png_colorspace_sync_info(png_ptr, info_ptr);
98 : }
99 :
100 : # ifdef PNG_FLOATING_POINT_SUPPORTED
101 : void PNGAPI
102 0 : 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 0 : 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 0 : }
116 :
117 : void PNGAPI
118 0 : 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 0 : 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 0 : }
133 : # endif /* FLOATING_POINT */
134 :
135 : #endif /* cHRM */
136 :
137 : #ifdef PNG_gAMA_SUPPORTED
138 : void PNGFAPI
139 0 : png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
140 : png_fixed_point file_gamma)
141 : {
142 : png_debug1(1, "in %s storage function", "gAMA");
143 :
144 0 : if (png_ptr == NULL || info_ptr == NULL)
145 0 : return;
146 :
147 0 : png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
148 0 : png_colorspace_sync_info(png_ptr, info_ptr);
149 : }
150 :
151 : # ifdef PNG_FLOATING_POINT_SUPPORTED
152 : void PNGAPI
153 0 : png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
154 : {
155 0 : png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
156 : "png_set_gAMA"));
157 0 : }
158 : # endif
159 : #endif
160 :
161 : #ifdef PNG_hIST_SUPPORTED
162 : void PNGAPI
163 : png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
164 : png_const_uint_16p hist)
165 : {
166 : int i;
167 :
168 : png_debug1(1, "in %s storage function", "hIST");
169 :
170 : if (png_ptr == NULL || info_ptr == NULL)
171 : return;
172 :
173 : if (info_ptr->num_palette == 0 || info_ptr->num_palette
174 : > PNG_MAX_PALETTE_LENGTH)
175 : {
176 : png_warning(png_ptr,
177 : "Invalid palette size, hIST allocation skipped");
178 :
179 : return;
180 : }
181 :
182 : png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
183 :
184 : /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
185 : * version 1.2.1
186 : */
187 : info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
188 : PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
189 :
190 : if (info_ptr->hist == NULL)
191 : {
192 : png_warning(png_ptr, "Insufficient memory for hIST chunk data");
193 :
194 : return;
195 : }
196 :
197 : info_ptr->free_me |= PNG_FREE_HIST;
198 :
199 : for (i = 0; i < info_ptr->num_palette; i++)
200 : info_ptr->hist[i] = hist[i];
201 :
202 : info_ptr->valid |= PNG_INFO_hIST;
203 : }
204 : #endif
205 :
206 : void PNGAPI
207 31 : png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
208 : png_uint_32 width, png_uint_32 height, int bit_depth,
209 : int color_type, int interlace_type, int compression_type,
210 : int filter_type)
211 : {
212 : png_debug1(1, "in %s storage function", "IHDR");
213 :
214 31 : if (png_ptr == NULL || info_ptr == NULL)
215 0 : return;
216 :
217 31 : info_ptr->width = width;
218 31 : info_ptr->height = height;
219 31 : info_ptr->bit_depth = (png_byte)bit_depth;
220 31 : info_ptr->color_type = (png_byte)color_type;
221 31 : info_ptr->compression_type = (png_byte)compression_type;
222 31 : info_ptr->filter_type = (png_byte)filter_type;
223 31 : info_ptr->interlace_type = (png_byte)interlace_type;
224 :
225 155 : png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
226 93 : info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
227 62 : info_ptr->compression_type, info_ptr->filter_type);
228 :
229 31 : if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
230 2 : info_ptr->channels = 1;
231 :
232 29 : else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
233 25 : info_ptr->channels = 3;
234 :
235 : else
236 4 : info_ptr->channels = 1;
237 :
238 31 : if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
239 29 : info_ptr->channels++;
240 :
241 31 : info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
242 :
243 31 : info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
244 :
245 : #ifdef PNG_APNG_SUPPORTED
246 : /* for non-animated png. this may be overwritten from an acTL chunk later */
247 31 : info_ptr->num_frames = 1;
248 : #endif
249 : }
250 :
251 : #ifdef PNG_oFFs_SUPPORTED
252 : void PNGAPI
253 : png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
254 : png_int_32 offset_x, png_int_32 offset_y, int unit_type)
255 : {
256 : png_debug1(1, "in %s storage function", "oFFs");
257 :
258 : if (png_ptr == NULL || info_ptr == NULL)
259 : return;
260 :
261 : info_ptr->x_offset = offset_x;
262 : info_ptr->y_offset = offset_y;
263 : info_ptr->offset_unit_type = (png_byte)unit_type;
264 : info_ptr->valid |= PNG_INFO_oFFs;
265 : }
266 : #endif
267 :
268 : #ifdef PNG_pCAL_SUPPORTED
269 : void PNGAPI
270 : png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
271 : png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
272 : int nparams, png_const_charp units, png_charpp params)
273 : {
274 : png_size_t length;
275 : int i;
276 :
277 : png_debug1(1, "in %s storage function", "pCAL");
278 :
279 : if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
280 : || (nparams > 0 && params == NULL))
281 : return;
282 :
283 : length = strlen(purpose) + 1;
284 : png_debug1(3, "allocating purpose for info (%lu bytes)",
285 : (unsigned long)length);
286 :
287 : /* TODO: validate format of calibration name and unit name */
288 :
289 : /* Check that the type matches the specification. */
290 : if (type < 0 || type > 3)
291 : {
292 : png_chunk_report(png_ptr, "Invalid pCAL equation type",
293 : PNG_CHUNK_WRITE_ERROR);
294 : return;
295 : }
296 :
297 : if (nparams < 0 || nparams > 255)
298 : {
299 : png_chunk_report(png_ptr, "Invalid pCAL parameter count",
300 : PNG_CHUNK_WRITE_ERROR);
301 : return;
302 : }
303 :
304 : /* Validate params[nparams] */
305 : for (i=0; i<nparams; ++i)
306 : {
307 : if (params[i] == NULL ||
308 : !png_check_fp_string(params[i], strlen(params[i])))
309 : {
310 : png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
311 : PNG_CHUNK_WRITE_ERROR);
312 : return;
313 : }
314 : }
315 :
316 : info_ptr->pcal_purpose = png_voidcast(png_charp,
317 : png_malloc_warn(png_ptr, length));
318 :
319 : if (info_ptr->pcal_purpose == NULL)
320 : {
321 : png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
322 : PNG_CHUNK_WRITE_ERROR);
323 : return;
324 : }
325 :
326 : memcpy(info_ptr->pcal_purpose, purpose, length);
327 :
328 : png_debug(3, "storing X0, X1, type, and nparams in info");
329 : info_ptr->pcal_X0 = X0;
330 : info_ptr->pcal_X1 = X1;
331 : info_ptr->pcal_type = (png_byte)type;
332 : info_ptr->pcal_nparams = (png_byte)nparams;
333 :
334 : length = strlen(units) + 1;
335 : png_debug1(3, "allocating units for info (%lu bytes)",
336 : (unsigned long)length);
337 :
338 : info_ptr->pcal_units = png_voidcast(png_charp,
339 : png_malloc_warn(png_ptr, length));
340 :
341 : if (info_ptr->pcal_units == NULL)
342 : {
343 : png_warning(png_ptr, "Insufficient memory for pCAL units");
344 :
345 : return;
346 : }
347 :
348 : memcpy(info_ptr->pcal_units, units, length);
349 :
350 : info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
351 : (png_size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
352 :
353 : if (info_ptr->pcal_params == NULL)
354 : {
355 : png_warning(png_ptr, "Insufficient memory for pCAL params");
356 :
357 : return;
358 : }
359 :
360 : memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
361 : (sizeof (png_charp)));
362 :
363 : for (i = 0; i < nparams; i++)
364 : {
365 : length = strlen(params[i]) + 1;
366 : png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
367 : (unsigned long)length);
368 :
369 : info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
370 :
371 : if (info_ptr->pcal_params[i] == NULL)
372 : {
373 : png_warning(png_ptr, "Insufficient memory for pCAL parameter");
374 :
375 : return;
376 : }
377 :
378 : memcpy(info_ptr->pcal_params[i], params[i], length);
379 : }
380 :
381 : info_ptr->valid |= PNG_INFO_pCAL;
382 : info_ptr->free_me |= PNG_FREE_PCAL;
383 : }
384 : #endif
385 :
386 : #ifdef PNG_sCAL_SUPPORTED
387 : void PNGAPI
388 : png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
389 : int unit, png_const_charp swidth, png_const_charp sheight)
390 : {
391 : png_size_t lengthw = 0, lengthh = 0;
392 :
393 : png_debug1(1, "in %s storage function", "sCAL");
394 :
395 : if (png_ptr == NULL || info_ptr == NULL)
396 : return;
397 :
398 : /* Double check the unit (should never get here with an invalid
399 : * unit unless this is an API call.)
400 : */
401 : if (unit != 1 && unit != 2)
402 : png_error(png_ptr, "Invalid sCAL unit");
403 :
404 : if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
405 : swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
406 : png_error(png_ptr, "Invalid sCAL width");
407 :
408 : if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
409 : sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
410 : png_error(png_ptr, "Invalid sCAL height");
411 :
412 : info_ptr->scal_unit = (png_byte)unit;
413 :
414 : ++lengthw;
415 :
416 : png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
417 :
418 : info_ptr->scal_s_width = png_voidcast(png_charp,
419 : png_malloc_warn(png_ptr, lengthw));
420 :
421 : if (info_ptr->scal_s_width == NULL)
422 : {
423 : png_warning(png_ptr, "Memory allocation failed while processing sCAL");
424 :
425 : return;
426 : }
427 :
428 : memcpy(info_ptr->scal_s_width, swidth, lengthw);
429 :
430 : ++lengthh;
431 :
432 : png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
433 :
434 : info_ptr->scal_s_height = png_voidcast(png_charp,
435 : png_malloc_warn(png_ptr, lengthh));
436 :
437 : if (info_ptr->scal_s_height == NULL)
438 : {
439 : png_free (png_ptr, info_ptr->scal_s_width);
440 : info_ptr->scal_s_width = NULL;
441 :
442 : png_warning(png_ptr, "Memory allocation failed while processing sCAL");
443 :
444 : return;
445 : }
446 :
447 : memcpy(info_ptr->scal_s_height, sheight, lengthh);
448 :
449 : info_ptr->valid |= PNG_INFO_sCAL;
450 : info_ptr->free_me |= PNG_FREE_SCAL;
451 : }
452 :
453 : # ifdef PNG_FLOATING_POINT_SUPPORTED
454 : void PNGAPI
455 : png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
456 : double width, double height)
457 : {
458 : png_debug1(1, "in %s storage function", "sCAL");
459 :
460 : /* Check the arguments. */
461 : if (width <= 0)
462 : png_warning(png_ptr, "Invalid sCAL width ignored");
463 :
464 : else if (height <= 0)
465 : png_warning(png_ptr, "Invalid sCAL height ignored");
466 :
467 : else
468 : {
469 : /* Convert 'width' and 'height' to ASCII. */
470 : char swidth[PNG_sCAL_MAX_DIGITS+1];
471 : char sheight[PNG_sCAL_MAX_DIGITS+1];
472 :
473 : png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
474 : PNG_sCAL_PRECISION);
475 : png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
476 : PNG_sCAL_PRECISION);
477 :
478 : png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
479 : }
480 : }
481 : # endif
482 :
483 : # ifdef PNG_FIXED_POINT_SUPPORTED
484 : void PNGAPI
485 : png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
486 : png_fixed_point width, png_fixed_point height)
487 : {
488 : png_debug1(1, "in %s storage function", "sCAL");
489 :
490 : /* Check the arguments. */
491 : if (width <= 0)
492 : png_warning(png_ptr, "Invalid sCAL width ignored");
493 :
494 : else if (height <= 0)
495 : png_warning(png_ptr, "Invalid sCAL height ignored");
496 :
497 : else
498 : {
499 : /* Convert 'width' and 'height' to ASCII. */
500 : char swidth[PNG_sCAL_MAX_DIGITS+1];
501 : char sheight[PNG_sCAL_MAX_DIGITS+1];
502 :
503 : png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
504 : png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
505 :
506 : png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
507 : }
508 : }
509 : # endif
510 : #endif
511 :
512 : #ifdef PNG_pHYs_SUPPORTED
513 : void PNGAPI
514 : png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
515 : png_uint_32 res_x, png_uint_32 res_y, int unit_type)
516 : {
517 : png_debug1(1, "in %s storage function", "pHYs");
518 :
519 : if (png_ptr == NULL || info_ptr == NULL)
520 : return;
521 :
522 : info_ptr->x_pixels_per_unit = res_x;
523 : info_ptr->y_pixels_per_unit = res_y;
524 : info_ptr->phys_unit_type = (png_byte)unit_type;
525 : info_ptr->valid |= PNG_INFO_pHYs;
526 : }
527 : #endif
528 :
529 : void PNGAPI
530 2 : png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
531 : png_const_colorp palette, int num_palette)
532 : {
533 :
534 : png_uint_32 max_palette_length;
535 :
536 : png_debug1(1, "in %s storage function", "PLTE");
537 :
538 2 : if (png_ptr == NULL || info_ptr == NULL)
539 0 : return;
540 :
541 4 : max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
542 2 : (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
543 :
544 2 : if (num_palette < 0 || num_palette > (int) max_palette_length)
545 : {
546 0 : if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
547 0 : png_error(png_ptr, "Invalid palette length");
548 :
549 : else
550 : {
551 0 : png_warning(png_ptr, "Invalid palette length");
552 :
553 0 : return;
554 : }
555 : }
556 :
557 2 : if ((num_palette > 0 && palette == NULL) ||
558 : (num_palette == 0
559 : # ifdef PNG_MNG_FEATURES_SUPPORTED
560 : && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
561 : # endif
562 : ))
563 : {
564 0 : png_error(png_ptr, "Invalid palette");
565 : }
566 :
567 : /* It may not actually be necessary to set png_ptr->palette here;
568 : * we do it for backward compatibility with the way the png_handle_tRNS
569 : * function used to do the allocation.
570 : *
571 : * 1.6.0: the above statement appears to be incorrect; something has to set
572 : * the palette inside png_struct on read.
573 : */
574 2 : png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
575 :
576 : /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
577 : * of num_palette entries, in case of an invalid PNG file or incorrect
578 : * call to png_set_PLTE() with too-large sample values.
579 : */
580 2 : png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
581 : PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
582 :
583 2 : if (num_palette > 0)
584 2 : memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
585 : (sizeof (png_color)));
586 2 : info_ptr->palette = png_ptr->palette;
587 2 : info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
588 :
589 2 : info_ptr->free_me |= PNG_FREE_PLTE;
590 :
591 2 : info_ptr->valid |= PNG_INFO_PLTE;
592 : }
593 :
594 : #ifdef PNG_sBIT_SUPPORTED
595 : void PNGAPI
596 : png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
597 : png_const_color_8p sig_bit)
598 : {
599 : png_debug1(1, "in %s storage function", "sBIT");
600 :
601 : if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
602 : return;
603 :
604 : info_ptr->sig_bit = *sig_bit;
605 : info_ptr->valid |= PNG_INFO_sBIT;
606 : }
607 : #endif
608 :
609 : #ifdef PNG_sRGB_SUPPORTED
610 : void PNGAPI
611 0 : png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
612 : {
613 : png_debug1(1, "in %s storage function", "sRGB");
614 :
615 0 : if (png_ptr == NULL || info_ptr == NULL)
616 0 : return;
617 :
618 0 : (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
619 0 : png_colorspace_sync_info(png_ptr, info_ptr);
620 : }
621 :
622 : void PNGAPI
623 0 : png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
624 : int srgb_intent)
625 : {
626 : png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
627 :
628 0 : if (png_ptr == NULL || info_ptr == NULL)
629 0 : return;
630 :
631 0 : if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
632 : srgb_intent) != 0)
633 : {
634 : /* This causes the gAMA and cHRM to be written too */
635 0 : info_ptr->colorspace.flags |=
636 : PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
637 : }
638 :
639 0 : png_colorspace_sync_info(png_ptr, info_ptr);
640 : }
641 : #endif /* sRGB */
642 :
643 :
644 : #ifdef PNG_iCCP_SUPPORTED
645 : void PNGAPI
646 0 : png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
647 : png_const_charp name, int compression_type,
648 : png_const_bytep profile, png_uint_32 proflen)
649 : {
650 : png_charp new_iccp_name;
651 : png_bytep new_iccp_profile;
652 : png_size_t length;
653 :
654 : png_debug1(1, "in %s storage function", "iCCP");
655 :
656 0 : if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
657 0 : return;
658 :
659 0 : if (compression_type != PNG_COMPRESSION_TYPE_BASE)
660 0 : png_app_error(png_ptr, "Invalid iCCP compression method");
661 :
662 : /* Set the colorspace first because this validates the profile; do not
663 : * override previously set app cHRM or gAMA here (because likely as not the
664 : * application knows better than libpng what the correct values are.) Pass
665 : * the info_ptr color_type field to png_colorspace_set_ICC because in the
666 : * write case it has not yet been stored in png_ptr.
667 : */
668 : {
669 0 : int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
670 0 : proflen, profile, info_ptr->color_type);
671 :
672 0 : png_colorspace_sync_info(png_ptr, info_ptr);
673 :
674 : /* Don't do any of the copying if the profile was bad, or inconsistent. */
675 0 : if (result == 0)
676 0 : return;
677 :
678 : /* But do write the gAMA and cHRM chunks from the profile. */
679 0 : info_ptr->colorspace.flags |=
680 : PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
681 : }
682 :
683 0 : length = strlen(name)+1;
684 0 : new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
685 :
686 0 : if (new_iccp_name == NULL)
687 : {
688 0 : png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
689 :
690 0 : return;
691 : }
692 :
693 0 : memcpy(new_iccp_name, name, length);
694 0 : new_iccp_profile = png_voidcast(png_bytep,
695 : png_malloc_warn(png_ptr, proflen));
696 :
697 0 : if (new_iccp_profile == NULL)
698 : {
699 0 : png_free(png_ptr, new_iccp_name);
700 0 : png_benign_error(png_ptr,
701 : "Insufficient memory to process iCCP profile");
702 :
703 0 : return;
704 : }
705 :
706 0 : memcpy(new_iccp_profile, profile, proflen);
707 :
708 0 : png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
709 :
710 0 : info_ptr->iccp_proflen = proflen;
711 0 : info_ptr->iccp_name = new_iccp_name;
712 0 : info_ptr->iccp_profile = new_iccp_profile;
713 0 : info_ptr->free_me |= PNG_FREE_ICCP;
714 0 : info_ptr->valid |= PNG_INFO_iCCP;
715 : }
716 : #endif
717 :
718 : #ifdef PNG_TEXT_SUPPORTED
719 : void PNGAPI
720 : png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
721 : png_const_textp text_ptr, int num_text)
722 : {
723 : int ret;
724 : ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
725 :
726 : if (ret != 0)
727 : png_error(png_ptr, "Insufficient memory to store text");
728 : }
729 :
730 : int /* PRIVATE */
731 : png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
732 : png_const_textp text_ptr, int num_text)
733 : {
734 : int i;
735 :
736 : png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
737 : (unsigned long)png_ptr->chunk_name);
738 :
739 : if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
740 : return(0);
741 :
742 : /* Make sure we have enough space in the "text" array in info_struct
743 : * to hold all of the incoming text_ptr objects. This compare can't overflow
744 : * because max_text >= num_text (anyway, subtract of two positive integers
745 : * can't overflow in any case.)
746 : */
747 : if (num_text > info_ptr->max_text - info_ptr->num_text)
748 : {
749 : int old_num_text = info_ptr->num_text;
750 : int max_text;
751 : png_textp new_text = NULL;
752 :
753 : /* Calculate an appropriate max_text, checking for overflow. */
754 : max_text = old_num_text;
755 : if (num_text <= INT_MAX - max_text)
756 : {
757 : max_text += num_text;
758 :
759 : /* Round up to a multiple of 8 */
760 : if (max_text < INT_MAX-8)
761 : max_text = (max_text + 8) & ~0x7;
762 :
763 : else
764 : max_text = INT_MAX;
765 :
766 : /* Now allocate a new array and copy the old members in; this does all
767 : * the overflow checks.
768 : */
769 : new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
770 : info_ptr->text, old_num_text, max_text-old_num_text,
771 : sizeof *new_text));
772 : }
773 :
774 : if (new_text == NULL)
775 : {
776 : png_chunk_report(png_ptr, "too many text chunks",
777 : PNG_CHUNK_WRITE_ERROR);
778 :
779 : return 1;
780 : }
781 :
782 : png_free(png_ptr, info_ptr->text);
783 :
784 : info_ptr->text = new_text;
785 : info_ptr->free_me |= PNG_FREE_TEXT;
786 : info_ptr->max_text = max_text;
787 : /* num_text is adjusted below as the entries are copied in */
788 :
789 : png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
790 : }
791 :
792 : for (i = 0; i < num_text; i++)
793 : {
794 : size_t text_length, key_len;
795 : size_t lang_len, lang_key_len;
796 : png_textp textp = &(info_ptr->text[info_ptr->num_text]);
797 :
798 : if (text_ptr[i].key == NULL)
799 : continue;
800 :
801 : if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
802 : text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
803 : {
804 : png_chunk_report(png_ptr, "text compression mode is out of range",
805 : PNG_CHUNK_WRITE_ERROR);
806 : continue;
807 : }
808 :
809 : key_len = strlen(text_ptr[i].key);
810 :
811 : if (text_ptr[i].compression <= 0)
812 : {
813 : lang_len = 0;
814 : lang_key_len = 0;
815 : }
816 :
817 : else
818 : # ifdef PNG_iTXt_SUPPORTED
819 : {
820 : /* Set iTXt data */
821 :
822 : if (text_ptr[i].lang != NULL)
823 : lang_len = strlen(text_ptr[i].lang);
824 :
825 : else
826 : lang_len = 0;
827 :
828 : if (text_ptr[i].lang_key != NULL)
829 : lang_key_len = strlen(text_ptr[i].lang_key);
830 :
831 : else
832 : lang_key_len = 0;
833 : }
834 : # else /* iTXt */
835 : {
836 : png_chunk_report(png_ptr, "iTXt chunk not supported",
837 : PNG_CHUNK_WRITE_ERROR);
838 : continue;
839 : }
840 : # endif
841 :
842 : if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
843 : {
844 : text_length = 0;
845 : # ifdef PNG_iTXt_SUPPORTED
846 : if (text_ptr[i].compression > 0)
847 : textp->compression = PNG_ITXT_COMPRESSION_NONE;
848 :
849 : else
850 : # endif
851 : textp->compression = PNG_TEXT_COMPRESSION_NONE;
852 : }
853 :
854 : else
855 : {
856 : text_length = strlen(text_ptr[i].text);
857 : textp->compression = text_ptr[i].compression;
858 : }
859 :
860 : textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
861 : key_len + text_length + lang_len + lang_key_len + 4));
862 :
863 : if (textp->key == NULL)
864 : {
865 : png_chunk_report(png_ptr, "text chunk: out of memory",
866 : PNG_CHUNK_WRITE_ERROR);
867 :
868 : return 1;
869 : }
870 :
871 : png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
872 : (unsigned long)(png_uint_32)
873 : (key_len + lang_len + lang_key_len + text_length + 4),
874 : textp->key);
875 :
876 : memcpy(textp->key, text_ptr[i].key, key_len);
877 : *(textp->key + key_len) = '\0';
878 :
879 : if (text_ptr[i].compression > 0)
880 : {
881 : textp->lang = textp->key + key_len + 1;
882 : memcpy(textp->lang, text_ptr[i].lang, lang_len);
883 : *(textp->lang + lang_len) = '\0';
884 : textp->lang_key = textp->lang + lang_len + 1;
885 : memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
886 : *(textp->lang_key + lang_key_len) = '\0';
887 : textp->text = textp->lang_key + lang_key_len + 1;
888 : }
889 :
890 : else
891 : {
892 : textp->lang=NULL;
893 : textp->lang_key=NULL;
894 : textp->text = textp->key + key_len + 1;
895 : }
896 :
897 : if (text_length != 0)
898 : memcpy(textp->text, text_ptr[i].text, text_length);
899 :
900 : *(textp->text + text_length) = '\0';
901 :
902 : # ifdef PNG_iTXt_SUPPORTED
903 : if (textp->compression > 0)
904 : {
905 : textp->text_length = 0;
906 : textp->itxt_length = text_length;
907 : }
908 :
909 : else
910 : # endif
911 : {
912 : textp->text_length = text_length;
913 : textp->itxt_length = 0;
914 : }
915 :
916 : info_ptr->num_text++;
917 : png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
918 : }
919 :
920 : return(0);
921 : }
922 : #endif
923 :
924 : #ifdef PNG_tIME_SUPPORTED
925 : void PNGAPI
926 : png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
927 : png_const_timep mod_time)
928 : {
929 : png_debug1(1, "in %s storage function", "tIME");
930 :
931 : if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
932 : (png_ptr->mode & PNG_WROTE_tIME) != 0)
933 : return;
934 :
935 : if (mod_time->month == 0 || mod_time->month > 12 ||
936 : mod_time->day == 0 || mod_time->day > 31 ||
937 : mod_time->hour > 23 || mod_time->minute > 59 ||
938 : mod_time->second > 60)
939 : {
940 : png_warning(png_ptr, "Ignoring invalid time value");
941 :
942 : return;
943 : }
944 :
945 : info_ptr->mod_time = *mod_time;
946 : info_ptr->valid |= PNG_INFO_tIME;
947 : }
948 : #endif
949 :
950 : #ifdef PNG_tRNS_SUPPORTED
951 : void PNGAPI
952 2 : png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
953 : png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
954 : {
955 : png_debug1(1, "in %s storage function", "tRNS");
956 :
957 2 : if (png_ptr == NULL || info_ptr == NULL)
958 :
959 0 : return;
960 :
961 2 : if (trans_alpha != NULL)
962 : {
963 : /* It may not actually be necessary to set png_ptr->trans_alpha here;
964 : * we do it for backward compatibility with the way the png_handle_tRNS
965 : * function used to do the allocation.
966 : *
967 : * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
968 : * relies on png_set_tRNS storing the information in png_struct
969 : * (otherwise it won't be there for the code in pngrtran.c).
970 : */
971 :
972 2 : png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
973 :
974 2 : if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
975 : {
976 : /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
977 2 : info_ptr->trans_alpha = png_voidcast(png_bytep,
978 : png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
979 2 : memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
980 : }
981 2 : png_ptr->trans_alpha = info_ptr->trans_alpha;
982 : }
983 :
984 2 : if (trans_color != NULL)
985 : {
986 : #ifdef PNG_WARNINGS_SUPPORTED
987 2 : if (info_ptr->bit_depth < 16)
988 : {
989 2 : int sample_max = (1 << info_ptr->bit_depth) - 1;
990 :
991 2 : if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
992 2 : trans_color->gray > sample_max) ||
993 2 : (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
994 0 : (trans_color->red > sample_max ||
995 0 : trans_color->green > sample_max ||
996 0 : trans_color->blue > sample_max)))
997 0 : png_warning(png_ptr,
998 : "tRNS chunk has out-of-range samples for bit_depth");
999 : }
1000 : #endif
1001 :
1002 2 : info_ptr->trans_color = *trans_color;
1003 :
1004 2 : if (num_trans == 0)
1005 0 : num_trans = 1;
1006 : }
1007 :
1008 2 : info_ptr->num_trans = (png_uint_16)num_trans;
1009 :
1010 2 : if (num_trans != 0)
1011 : {
1012 2 : info_ptr->valid |= PNG_INFO_tRNS;
1013 2 : info_ptr->free_me |= PNG_FREE_TRNS;
1014 : }
1015 : }
1016 : #endif
1017 :
1018 : #ifdef PNG_sPLT_SUPPORTED
1019 : void PNGAPI
1020 : png_set_sPLT(png_const_structrp png_ptr,
1021 : png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
1022 : /*
1023 : * entries - array of png_sPLT_t structures
1024 : * to be added to the list of palettes
1025 : * in the info structure.
1026 : *
1027 : * nentries - number of palette structures to be
1028 : * added.
1029 : */
1030 : {
1031 : png_sPLT_tp np;
1032 :
1033 : if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
1034 : return;
1035 :
1036 : /* Use the internal realloc function, which checks for all the possible
1037 : * overflows. Notice that the parameters are (int) and (size_t)
1038 : */
1039 : np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
1040 : info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
1041 : sizeof *np));
1042 :
1043 : if (np == NULL)
1044 : {
1045 : /* Out of memory or too many chunks */
1046 : png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
1047 :
1048 : return;
1049 : }
1050 :
1051 : png_free(png_ptr, info_ptr->splt_palettes);
1052 : info_ptr->splt_palettes = np;
1053 : info_ptr->free_me |= PNG_FREE_SPLT;
1054 :
1055 : np += info_ptr->splt_palettes_num;
1056 :
1057 : do
1058 : {
1059 : png_size_t length;
1060 :
1061 : /* Skip invalid input entries */
1062 : if (entries->name == NULL || entries->entries == NULL)
1063 : {
1064 : /* png_handle_sPLT doesn't do this, so this is an app error */
1065 : png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
1066 : /* Just skip the invalid entry */
1067 : continue;
1068 : }
1069 :
1070 : np->depth = entries->depth;
1071 :
1072 : /* In the event of out-of-memory just return - there's no point keeping
1073 : * on trying to add sPLT chunks.
1074 : */
1075 : length = strlen(entries->name) + 1;
1076 : np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
1077 :
1078 : if (np->name == NULL)
1079 : break;
1080 :
1081 : memcpy(np->name, entries->name, length);
1082 :
1083 : /* IMPORTANT: we have memory now that won't get freed if something else
1084 : * goes wrong; this code must free it. png_malloc_array produces no
1085 : * warnings; use a png_chunk_report (below) if there is an error.
1086 : */
1087 : np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
1088 : entries->nentries, sizeof (png_sPLT_entry)));
1089 :
1090 : if (np->entries == NULL)
1091 : {
1092 : png_free(png_ptr, np->name);
1093 : np->name = NULL;
1094 : break;
1095 : }
1096 :
1097 : np->nentries = entries->nentries;
1098 : /* This multiply can't overflow because png_malloc_array has already
1099 : * checked it when doing the allocation.
1100 : */
1101 : memcpy(np->entries, entries->entries,
1102 : (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
1103 :
1104 : /* Note that 'continue' skips the advance of the out pointer and out
1105 : * count, so an invalid entry is not added.
1106 : */
1107 : info_ptr->valid |= PNG_INFO_sPLT;
1108 : ++(info_ptr->splt_palettes_num);
1109 : ++np;
1110 : }
1111 : while (++entries, --nentries);
1112 :
1113 : if (nentries > 0)
1114 : png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
1115 : }
1116 : #endif /* sPLT */
1117 :
1118 : #ifdef PNG_APNG_SUPPORTED
1119 : png_uint_32 PNGAPI
1120 4 : png_set_acTL(png_structp png_ptr, png_infop info_ptr,
1121 : png_uint_32 num_frames, png_uint_32 num_plays)
1122 : {
1123 : png_debug1(1, "in %s storage function", "acTL");
1124 :
1125 4 : if (png_ptr == NULL || info_ptr == NULL)
1126 : {
1127 0 : png_warning(png_ptr,
1128 : "Call to png_set_acTL() with NULL png_ptr "
1129 : "or info_ptr ignored");
1130 0 : return (0);
1131 : }
1132 4 : if (num_frames == 0)
1133 : {
1134 0 : png_warning(png_ptr,
1135 : "Ignoring attempt to set acTL with num_frames zero");
1136 0 : return (0);
1137 : }
1138 4 : if (num_frames > PNG_UINT_31_MAX)
1139 : {
1140 0 : png_warning(png_ptr,
1141 : "Ignoring attempt to set acTL with num_frames > 2^31-1");
1142 0 : return (0);
1143 : }
1144 4 : if (num_plays > PNG_UINT_31_MAX)
1145 : {
1146 0 : png_warning(png_ptr,
1147 : "Ignoring attempt to set acTL with num_plays > 2^31-1");
1148 0 : return (0);
1149 : }
1150 :
1151 4 : info_ptr->num_frames = num_frames;
1152 4 : info_ptr->num_plays = num_plays;
1153 :
1154 4 : info_ptr->valid |= PNG_INFO_acTL;
1155 :
1156 4 : return (1);
1157 : }
1158 :
1159 : /* delay_num and delay_den can hold any 16-bit values including zero */
1160 : png_uint_32 PNGAPI
1161 38 : png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
1162 : png_uint_32 width, png_uint_32 height,
1163 : png_uint_32 x_offset, png_uint_32 y_offset,
1164 : png_uint_16 delay_num, png_uint_16 delay_den,
1165 : png_byte dispose_op, png_byte blend_op)
1166 : {
1167 : png_debug1(1, "in %s storage function", "fcTL");
1168 :
1169 38 : if (png_ptr == NULL || info_ptr == NULL)
1170 : {
1171 0 : png_warning(png_ptr,
1172 : "Call to png_set_fcTL() with NULL png_ptr or info_ptr "
1173 : "ignored");
1174 0 : return (0);
1175 : }
1176 :
1177 38 : png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
1178 : delay_num, delay_den, dispose_op, blend_op);
1179 :
1180 38 : if (blend_op == PNG_BLEND_OP_OVER)
1181 : {
1182 0 : if ((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) == 0 &&
1183 0 : png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) == 0)
1184 : {
1185 0 : png_warning(png_ptr, "PNG_BLEND_OP_OVER is meaningless "
1186 : "and wasteful for opaque images, ignored");
1187 0 : blend_op = PNG_BLEND_OP_SOURCE;
1188 : }
1189 : }
1190 :
1191 38 : info_ptr->next_frame_width = width;
1192 38 : info_ptr->next_frame_height = height;
1193 38 : info_ptr->next_frame_x_offset = x_offset;
1194 38 : info_ptr->next_frame_y_offset = y_offset;
1195 38 : info_ptr->next_frame_delay_num = delay_num;
1196 38 : info_ptr->next_frame_delay_den = delay_den;
1197 38 : info_ptr->next_frame_dispose_op = dispose_op;
1198 38 : info_ptr->next_frame_blend_op = blend_op;
1199 :
1200 38 : info_ptr->valid |= PNG_INFO_fcTL;
1201 :
1202 38 : return (1);
1203 : }
1204 :
1205 : void /* PRIVATE */
1206 38 : png_ensure_fcTL_is_valid(png_structp png_ptr,
1207 : png_uint_32 width, png_uint_32 height,
1208 : png_uint_32 x_offset, png_uint_32 y_offset,
1209 : png_uint_16 delay_num, png_uint_16 delay_den,
1210 : png_byte dispose_op, png_byte blend_op)
1211 : {
1212 38 : if (width == 0 || width > PNG_UINT_31_MAX)
1213 0 : png_error(png_ptr, "invalid width in fcTL (0 or > 2^31-1)");
1214 38 : if (height == 0 || height > PNG_UINT_31_MAX)
1215 0 : png_error(png_ptr, "invalid height in fcTL (0 or > 2^31-1)");
1216 38 : if (x_offset > PNG_UINT_31_MAX)
1217 0 : png_error(png_ptr, "invalid x_offset in fcTL (> 2^31-1)");
1218 38 : if (y_offset > PNG_UINT_31_MAX)
1219 0 : png_error(png_ptr, "invalid y_offset in fcTL (> 2^31-1)");
1220 76 : if (width + x_offset > png_ptr->first_frame_width ||
1221 38 : height + y_offset > png_ptr->first_frame_height)
1222 0 : png_error(png_ptr, "dimensions of a frame are greater than "
1223 : "the ones in IHDR");
1224 :
1225 38 : if (dispose_op != PNG_DISPOSE_OP_NONE &&
1226 0 : dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
1227 : dispose_op != PNG_DISPOSE_OP_PREVIOUS)
1228 0 : png_error(png_ptr, "invalid dispose_op in fcTL");
1229 :
1230 38 : if (blend_op != PNG_BLEND_OP_SOURCE &&
1231 : blend_op != PNG_BLEND_OP_OVER)
1232 0 : png_error(png_ptr, "invalid blend_op in fcTL");
1233 :
1234 : PNG_UNUSED(delay_num)
1235 : PNG_UNUSED(delay_den)
1236 38 : }
1237 :
1238 : png_uint_32 PNGAPI
1239 0 : png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
1240 : png_byte is_hidden)
1241 : {
1242 : png_debug(1, "in png_first_frame_is_hidden()");
1243 :
1244 0 : if (png_ptr == NULL)
1245 0 : return 0;
1246 :
1247 0 : if (is_hidden != 0)
1248 0 : png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
1249 : else
1250 0 : png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
1251 :
1252 : PNG_UNUSED(info_ptr)
1253 :
1254 0 : return 1;
1255 : }
1256 : #endif /* APNG */
1257 :
1258 : #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1259 : static png_byte
1260 : check_location(png_const_structrp png_ptr, int location)
1261 : {
1262 : location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
1263 :
1264 : /* New in 1.6.0; copy the location and check it. This is an API
1265 : * change; previously the app had to use the
1266 : * png_set_unknown_chunk_location API below for each chunk.
1267 : */
1268 : if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1269 : {
1270 : /* Write struct, so unknown chunks come from the app */
1271 : png_app_warning(png_ptr,
1272 : "png_set_unknown_chunks now expects a valid location");
1273 : /* Use the old behavior */
1274 : location = (png_byte)(png_ptr->mode &
1275 : (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
1276 : }
1277 :
1278 : /* This need not be an internal error - if the app calls
1279 : * png_set_unknown_chunks on a read pointer it must get the location right.
1280 : */
1281 : if (location == 0)
1282 : png_error(png_ptr, "invalid location in png_set_unknown_chunks");
1283 :
1284 : /* Now reduce the location to the top-most set bit by removing each least
1285 : * significant bit in turn.
1286 : */
1287 : while (location != (location & -location))
1288 : location &= ~(location & -location);
1289 :
1290 : /* The cast is safe because 'location' is a bit mask and only the low four
1291 : * bits are significant.
1292 : */
1293 : return (png_byte)location;
1294 : }
1295 :
1296 : void PNGAPI
1297 : png_set_unknown_chunks(png_const_structrp png_ptr,
1298 : png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
1299 : {
1300 : png_unknown_chunkp np;
1301 :
1302 : if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
1303 : unknowns == NULL)
1304 : return;
1305 :
1306 : /* Check for the failure cases where support has been disabled at compile
1307 : * time. This code is hardly ever compiled - it's here because
1308 : * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
1309 : * code) but may be meaningless if the read or write handling of unknown
1310 : * chunks is not compiled in.
1311 : */
1312 : # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
1313 : defined(PNG_READ_SUPPORTED)
1314 : if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1315 : {
1316 : png_app_error(png_ptr, "no unknown chunk support on read");
1317 :
1318 : return;
1319 : }
1320 : # endif
1321 : # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
1322 : defined(PNG_WRITE_SUPPORTED)
1323 : if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1324 : {
1325 : png_app_error(png_ptr, "no unknown chunk support on write");
1326 :
1327 : return;
1328 : }
1329 : # endif
1330 :
1331 : /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
1332 : * unknown critical chunks could be lost with just a warning resulting in
1333 : * undefined behavior. Now png_chunk_report is used to provide behavior
1334 : * appropriate to read or write.
1335 : */
1336 : np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
1337 : info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
1338 : sizeof *np));
1339 :
1340 : if (np == NULL)
1341 : {
1342 : png_chunk_report(png_ptr, "too many unknown chunks",
1343 : PNG_CHUNK_WRITE_ERROR);
1344 :
1345 : return;
1346 : }
1347 :
1348 : png_free(png_ptr, info_ptr->unknown_chunks);
1349 : info_ptr->unknown_chunks = np; /* safe because it is initialized */
1350 : info_ptr->free_me |= PNG_FREE_UNKN;
1351 :
1352 : np += info_ptr->unknown_chunks_num;
1353 :
1354 : /* Increment unknown_chunks_num each time round the loop to protect the
1355 : * just-allocated chunk data.
1356 : */
1357 : for (; num_unknowns > 0; --num_unknowns, ++unknowns)
1358 : {
1359 : memcpy(np->name, unknowns->name, (sizeof np->name));
1360 : np->name[(sizeof np->name)-1] = '\0';
1361 : np->location = check_location(png_ptr, unknowns->location);
1362 :
1363 : if (unknowns->size == 0)
1364 : {
1365 : np->data = NULL;
1366 : np->size = 0;
1367 : }
1368 :
1369 : else
1370 : {
1371 : np->data = png_voidcast(png_bytep,
1372 : png_malloc_base(png_ptr, unknowns->size));
1373 :
1374 : if (np->data == NULL)
1375 : {
1376 : png_chunk_report(png_ptr, "unknown chunk: out of memory",
1377 : PNG_CHUNK_WRITE_ERROR);
1378 : /* But just skip storing the unknown chunk */
1379 : continue;
1380 : }
1381 :
1382 : memcpy(np->data, unknowns->data, unknowns->size);
1383 : np->size = unknowns->size;
1384 : }
1385 :
1386 : /* These increments are skipped on out-of-memory for the data - the
1387 : * unknown chunk entry gets overwritten if the png_chunk_report returns.
1388 : * This is correct in the read case (the chunk is just dropped.)
1389 : */
1390 : ++np;
1391 : ++(info_ptr->unknown_chunks_num);
1392 : }
1393 : }
1394 :
1395 : void PNGAPI
1396 : png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
1397 : int chunk, int location)
1398 : {
1399 : /* This API is pretty pointless in 1.6.0 because the location can be set
1400 : * before the call to png_set_unknown_chunks.
1401 : *
1402 : * TODO: add a png_app_warning in 1.7
1403 : */
1404 : if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
1405 : chunk < info_ptr->unknown_chunks_num)
1406 : {
1407 : if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
1408 : {
1409 : png_app_error(png_ptr, "invalid unknown chunk location");
1410 : /* Fake out the pre 1.6.0 behavior: */
1411 : if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
1412 : location = PNG_AFTER_IDAT;
1413 :
1414 : else
1415 : location = PNG_HAVE_IHDR; /* also undocumented */
1416 : }
1417 :
1418 : info_ptr->unknown_chunks[chunk].location =
1419 : check_location(png_ptr, location);
1420 : }
1421 : }
1422 : #endif /* STORE_UNKNOWN_CHUNKS */
1423 :
1424 : #ifdef PNG_MNG_FEATURES_SUPPORTED
1425 : png_uint_32 PNGAPI
1426 : png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
1427 : {
1428 : png_debug(1, "in png_permit_mng_features");
1429 :
1430 : if (png_ptr == NULL)
1431 : return 0;
1432 :
1433 : png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
1434 :
1435 : return png_ptr->mng_features_permitted;
1436 : }
1437 : #endif
1438 :
1439 : #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1440 : static unsigned int
1441 : add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
1442 : {
1443 : unsigned int i;
1444 :
1445 : /* Utility function: update the 'keep' state of a chunk if it is already in
1446 : * the list, otherwise add it to the list.
1447 : */
1448 : for (i=0; i<count; ++i, list += 5)
1449 : {
1450 : if (memcmp(list, add, 4) == 0)
1451 : {
1452 : list[4] = (png_byte)keep;
1453 :
1454 : return count;
1455 : }
1456 : }
1457 :
1458 : if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
1459 : {
1460 : ++count;
1461 : memcpy(list, add, 4);
1462 : list[4] = (png_byte)keep;
1463 : }
1464 :
1465 : return count;
1466 : }
1467 :
1468 : void PNGAPI
1469 : png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
1470 : png_const_bytep chunk_list, int num_chunks_in)
1471 : {
1472 : png_bytep new_list;
1473 : unsigned int num_chunks, old_num_chunks;
1474 :
1475 : if (png_ptr == NULL)
1476 : return;
1477 :
1478 : if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
1479 : {
1480 : png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
1481 :
1482 : return;
1483 : }
1484 :
1485 : if (num_chunks_in <= 0)
1486 : {
1487 : png_ptr->unknown_default = keep;
1488 :
1489 : /* '0' means just set the flags, so stop here */
1490 : if (num_chunks_in == 0)
1491 : return;
1492 : }
1493 :
1494 : if (num_chunks_in < 0)
1495 : {
1496 : /* Ignore all unknown chunks and all chunks recognized by
1497 : * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
1498 : */
1499 : static PNG_CONST png_byte chunks_to_ignore[] = {
1500 : 98, 75, 71, 68, '\0', /* bKGD */
1501 : 99, 72, 82, 77, '\0', /* cHRM */
1502 : 103, 65, 77, 65, '\0', /* gAMA */
1503 : 104, 73, 83, 84, '\0', /* hIST */
1504 : 105, 67, 67, 80, '\0', /* iCCP */
1505 : 105, 84, 88, 116, '\0', /* iTXt */
1506 : 111, 70, 70, 115, '\0', /* oFFs */
1507 : 112, 67, 65, 76, '\0', /* pCAL */
1508 : 112, 72, 89, 115, '\0', /* pHYs */
1509 : 115, 66, 73, 84, '\0', /* sBIT */
1510 : 115, 67, 65, 76, '\0', /* sCAL */
1511 : 115, 80, 76, 84, '\0', /* sPLT */
1512 : 115, 84, 69, 82, '\0', /* sTER */
1513 : 115, 82, 71, 66, '\0', /* sRGB */
1514 : 116, 69, 88, 116, '\0', /* tEXt */
1515 : 116, 73, 77, 69, '\0', /* tIME */
1516 : 122, 84, 88, 116, '\0' /* zTXt */
1517 : };
1518 :
1519 : chunk_list = chunks_to_ignore;
1520 : num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
1521 : }
1522 :
1523 : else /* num_chunks_in > 0 */
1524 : {
1525 : if (chunk_list == NULL)
1526 : {
1527 : /* Prior to 1.6.0 this was silently ignored, now it is an app_error
1528 : * which can be switched off.
1529 : */
1530 : png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
1531 :
1532 : return;
1533 : }
1534 :
1535 : num_chunks = (unsigned int)num_chunks_in;
1536 : }
1537 :
1538 : old_num_chunks = png_ptr->num_chunk_list;
1539 : if (png_ptr->chunk_list == NULL)
1540 : old_num_chunks = 0;
1541 :
1542 : /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
1543 : */
1544 : if (num_chunks + old_num_chunks > UINT_MAX/5)
1545 : {
1546 : png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
1547 :
1548 : return;
1549 : }
1550 :
1551 : /* If these chunks are being reset to the default then no more memory is
1552 : * required because add_one_chunk above doesn't extend the list if the 'keep'
1553 : * parameter is the default.
1554 : */
1555 : if (keep != 0)
1556 : {
1557 : new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
1558 : 5 * (num_chunks + old_num_chunks)));
1559 :
1560 : if (old_num_chunks > 0)
1561 : memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
1562 : }
1563 :
1564 : else if (old_num_chunks > 0)
1565 : new_list = png_ptr->chunk_list;
1566 :
1567 : else
1568 : new_list = NULL;
1569 :
1570 : /* Add the new chunks together with each one's handling code. If the chunk
1571 : * already exists the code is updated, otherwise the chunk is added to the
1572 : * end. (In libpng 1.6.0 order no longer matters because this code enforces
1573 : * the earlier convention that the last setting is the one that is used.)
1574 : */
1575 : if (new_list != NULL)
1576 : {
1577 : png_const_bytep inlist;
1578 : png_bytep outlist;
1579 : unsigned int i;
1580 :
1581 : for (i=0; i<num_chunks; ++i)
1582 : {
1583 : old_num_chunks = add_one_chunk(new_list, old_num_chunks,
1584 : chunk_list+5*i, keep);
1585 : }
1586 :
1587 : /* Now remove any spurious 'default' entries. */
1588 : num_chunks = 0;
1589 : for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
1590 : {
1591 : if (inlist[4])
1592 : {
1593 : if (outlist != inlist)
1594 : memcpy(outlist, inlist, 5);
1595 : outlist += 5;
1596 : ++num_chunks;
1597 : }
1598 : }
1599 :
1600 : /* This means the application has removed all the specialized handling. */
1601 : if (num_chunks == 0)
1602 : {
1603 : if (png_ptr->chunk_list != new_list)
1604 : png_free(png_ptr, new_list);
1605 :
1606 : new_list = NULL;
1607 : }
1608 : }
1609 :
1610 : else
1611 : num_chunks = 0;
1612 :
1613 : png_ptr->num_chunk_list = num_chunks;
1614 :
1615 : if (png_ptr->chunk_list != new_list)
1616 : {
1617 : if (png_ptr->chunk_list != NULL)
1618 : png_free(png_ptr, png_ptr->chunk_list);
1619 :
1620 : png_ptr->chunk_list = new_list;
1621 : }
1622 : }
1623 : #endif
1624 :
1625 : #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1626 : void PNGAPI
1627 : png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
1628 : png_user_chunk_ptr read_user_chunk_fn)
1629 : {
1630 : png_debug(1, "in png_set_read_user_chunk_fn");
1631 :
1632 : if (png_ptr == NULL)
1633 : return;
1634 :
1635 : png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1636 : png_ptr->user_chunk_ptr = user_chunk_ptr;
1637 : }
1638 : #endif
1639 :
1640 : #ifdef PNG_INFO_IMAGE_SUPPORTED
1641 : void PNGAPI
1642 : png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
1643 : png_bytepp row_pointers)
1644 : {
1645 : png_debug1(1, "in %s storage function", "rows");
1646 :
1647 : if (png_ptr == NULL || info_ptr == NULL)
1648 : return;
1649 :
1650 : if (info_ptr->row_pointers != NULL &&
1651 : (info_ptr->row_pointers != row_pointers))
1652 : png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1653 :
1654 : info_ptr->row_pointers = row_pointers;
1655 :
1656 : if (row_pointers != NULL)
1657 : info_ptr->valid |= PNG_INFO_IDAT;
1658 : }
1659 : #endif
1660 :
1661 : void PNGAPI
1662 0 : png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
1663 : {
1664 0 : if (png_ptr == NULL)
1665 0 : return;
1666 :
1667 0 : if (size == 0 || size > PNG_UINT_31_MAX)
1668 0 : png_error(png_ptr, "invalid compression buffer size");
1669 :
1670 : # ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1671 : if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1672 : {
1673 : png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
1674 : return;
1675 : }
1676 : # endif
1677 :
1678 : # ifdef PNG_WRITE_SUPPORTED
1679 0 : if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
1680 : {
1681 0 : if (png_ptr->zowner != 0)
1682 : {
1683 0 : png_warning(png_ptr,
1684 : "Compression buffer size cannot be changed because it is in use");
1685 :
1686 0 : return;
1687 : }
1688 :
1689 : #ifndef __COVERITY__
1690 : /* Some compilers complain that this is always false. However, it
1691 : * can be true when integer overflow happens.
1692 : */
1693 0 : if (size > ZLIB_IO_MAX)
1694 : {
1695 0 : png_warning(png_ptr,
1696 : "Compression buffer size limited to system maximum");
1697 0 : size = ZLIB_IO_MAX; /* must fit */
1698 : }
1699 : #endif
1700 :
1701 0 : if (size < 6)
1702 : {
1703 : /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
1704 : * if this is permitted.
1705 : */
1706 0 : png_warning(png_ptr,
1707 : "Compression buffer size cannot be reduced below 6");
1708 :
1709 0 : return;
1710 : }
1711 :
1712 0 : if (png_ptr->zbuffer_size != size)
1713 : {
1714 0 : png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
1715 0 : png_ptr->zbuffer_size = (uInt)size;
1716 : }
1717 : }
1718 : # endif
1719 : }
1720 :
1721 : void PNGAPI
1722 0 : png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
1723 : {
1724 0 : if (png_ptr != NULL && info_ptr != NULL)
1725 0 : info_ptr->valid &= (unsigned int)(~mask);
1726 0 : }
1727 :
1728 :
1729 : #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1730 : /* This function was added to libpng 1.2.6 */
1731 : void PNGAPI
1732 31 : png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
1733 : png_uint_32 user_height_max)
1734 : {
1735 : /* Images with dimensions larger than these limits will be
1736 : * rejected by png_set_IHDR(). To accept any PNG datastream
1737 : * regardless of dimensions, set both limits to 0x7fffffff.
1738 : */
1739 31 : if (png_ptr == NULL)
1740 0 : return;
1741 :
1742 31 : png_ptr->user_width_max = user_width_max;
1743 31 : png_ptr->user_height_max = user_height_max;
1744 : }
1745 :
1746 : /* This function was added to libpng 1.4.0 */
1747 : void PNGAPI
1748 0 : png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
1749 : {
1750 0 : if (png_ptr != NULL)
1751 0 : png_ptr->user_chunk_cache_max = user_chunk_cache_max;
1752 0 : }
1753 :
1754 : /* This function was added to libpng 1.4.1 */
1755 : void PNGAPI
1756 31 : png_set_chunk_malloc_max (png_structrp png_ptr,
1757 : png_alloc_size_t user_chunk_malloc_max)
1758 : {
1759 31 : if (png_ptr != NULL)
1760 31 : png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
1761 31 : }
1762 : #endif /* ?SET_USER_LIMITS */
1763 :
1764 :
1765 : #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1766 : void PNGAPI
1767 0 : png_set_benign_errors(png_structrp png_ptr, int allowed)
1768 : {
1769 : png_debug(1, "in png_set_benign_errors");
1770 :
1771 : /* If allowed is 1, png_benign_error() is treated as a warning.
1772 : *
1773 : * If allowed is 0, png_benign_error() is treated as an error (which
1774 : * is the default behavior if png_set_benign_errors() is not called).
1775 : */
1776 :
1777 0 : if (allowed != 0)
1778 0 : png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
1779 : PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
1780 :
1781 : else
1782 0 : png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
1783 : PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
1784 0 : }
1785 : #endif /* BENIGN_ERRORS */
1786 :
1787 : #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1788 : /* Whether to report invalid palette index; added at libng-1.5.10.
1789 : * It is possible for an indexed (color-type==3) PNG file to contain
1790 : * pixels with invalid (out-of-range) indexes if the PLTE chunk has
1791 : * fewer entries than the image's bit-depth would allow. We recover
1792 : * from this gracefully by filling any incomplete palette with zeros
1793 : * (opaque black). By default, when this occurs libpng will issue
1794 : * a benign error. This API can be used to override that behavior.
1795 : */
1796 : void PNGAPI
1797 : png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
1798 : {
1799 : png_debug(1, "in png_set_check_for_invalid_index");
1800 :
1801 : if (allowed > 0)
1802 : png_ptr->num_palette_max = 0;
1803 :
1804 : else
1805 : png_ptr->num_palette_max = -1;
1806 : }
1807 : #endif
1808 :
1809 : #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
1810 : defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
1811 : /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
1812 : * and if invalid, correct the keyword rather than discarding the entire
1813 : * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
1814 : * length, forbids leading or trailing whitespace, multiple internal spaces,
1815 : * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
1816 : *
1817 : * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
1818 : * trailing '\0'). If this routine returns 0 then there was no keyword, or a
1819 : * valid one could not be generated, and the caller must png_error.
1820 : */
1821 : png_uint_32 /* PRIVATE */
1822 0 : png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
1823 : {
1824 : #ifdef PNG_WARNINGS_SUPPORTED
1825 0 : png_const_charp orig_key = key;
1826 : #endif
1827 0 : png_uint_32 key_len = 0;
1828 0 : int bad_character = 0;
1829 0 : int space = 1;
1830 :
1831 : png_debug(1, "in png_check_keyword");
1832 :
1833 0 : if (key == NULL)
1834 : {
1835 0 : *new_key = 0;
1836 0 : return 0;
1837 : }
1838 :
1839 0 : while (*key && key_len < 79)
1840 : {
1841 0 : png_byte ch = (png_byte)*key++;
1842 :
1843 0 : if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
1844 0 : *new_key++ = ch, ++key_len, space = 0;
1845 :
1846 0 : else if (space == 0)
1847 : {
1848 : /* A space or an invalid character when one wasn't seen immediately
1849 : * before; output just a space.
1850 : */
1851 0 : *new_key++ = 32, ++key_len, space = 1;
1852 :
1853 : /* If the character was not a space then it is invalid. */
1854 0 : if (ch != 32)
1855 0 : bad_character = ch;
1856 : }
1857 :
1858 0 : else if (bad_character == 0)
1859 0 : bad_character = ch; /* just skip it, record the first error */
1860 : }
1861 :
1862 0 : if (key_len > 0 && space != 0) /* trailing space */
1863 : {
1864 0 : --key_len, --new_key;
1865 0 : if (bad_character == 0)
1866 0 : bad_character = 32;
1867 : }
1868 :
1869 : /* Terminate the keyword */
1870 0 : *new_key = 0;
1871 :
1872 0 : if (key_len == 0)
1873 0 : return 0;
1874 :
1875 : #ifdef PNG_WARNINGS_SUPPORTED
1876 : /* Try to only output one warning per keyword: */
1877 0 : if (*key != 0) /* keyword too long */
1878 0 : png_warning(png_ptr, "keyword truncated");
1879 :
1880 0 : else if (bad_character != 0)
1881 : {
1882 : PNG_WARNING_PARAMETERS(p)
1883 :
1884 0 : png_warning_parameter(p, 1, orig_key);
1885 0 : png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
1886 :
1887 0 : png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
1888 : }
1889 : #else /* !WARNINGS */
1890 : PNG_UNUSED(png_ptr)
1891 : #endif /* !WARNINGS */
1892 :
1893 0 : return key_len;
1894 : }
1895 : #endif /* TEXT || pCAL || iCCP || sPLT */
1896 : #endif /* READ || WRITE */
|
