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1 | |
2 /* pngset.c - storage of image information into info struct | |
3 * | |
4 * Last changed in libpng 1.6.19 [November 12, 2015] | |
5 * Copyright (c) 1998-2015 Glenn Randers-Pehrson | |
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | |
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | |
8 * | |
9 * This code is released under the libpng license. | |
10 * For conditions of distribution and use, see the disclaimer | |
11 * and license in png.h | |
12 * | |
13 * The functions here are used during reads to store data from the file | |
14 * into the info struct, and during writes to store application data | |
15 * into the info struct for writing into the file. This abstracts the | |
16 * info struct and allows us to change the structure in the future. | |
17 */ | |
18 | |
19 #include "pngpriv.h" | |
20 | |
21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) | |
22 | |
23 #ifdef PNG_bKGD_SUPPORTED | |
24 void PNGAPI | |
25 png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, | |
26 png_const_color_16p background) | |
27 { | |
28 png_debug1(1, "in %s storage function", "bKGD"); | |
29 | |
30 if (png_ptr == NULL || info_ptr == NULL || background == NULL) | |
31 return; | |
32 | |
33 info_ptr->background = *background; | |
34 info_ptr->valid |= PNG_INFO_bKGD; | |
35 } | |
36 #endif | |
37 | |
38 #ifdef PNG_cHRM_SUPPORTED | |
39 void PNGFAPI | |
40 png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
41 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, | |
42 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, | |
43 png_fixed_point blue_x, png_fixed_point blue_y) | |
44 { | |
45 png_xy xy; | |
46 | |
47 png_debug1(1, "in %s storage function", "cHRM fixed"); | |
48 | |
49 if (png_ptr == NULL || info_ptr == NULL) | |
50 return; | |
51 | |
52 xy.redx = red_x; | |
53 xy.redy = red_y; | |
54 xy.greenx = green_x; | |
55 xy.greeny = green_y; | |
56 xy.bluex = blue_x; | |
57 xy.bluey = blue_y; | |
58 xy.whitex = white_x; | |
59 xy.whitey = white_y; | |
60 | |
61 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, | |
62 2/* override with app values*/) != 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 | |
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 | |
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 | |
118 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, | |
119 double red_Y, double red_Z, double green_X, double green_Y, double green_Z, | |
120 double blue_X, double blue_Y, double blue_Z) | |
121 { | |
122 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, | |
123 png_fixed(png_ptr, red_X, "cHRM Red X"), | |
124 png_fixed(png_ptr, red_Y, "cHRM Red Y"), | |
125 png_fixed(png_ptr, red_Z, "cHRM Red Z"), | |
126 png_fixed(png_ptr, green_X, "cHRM Green X"), | |
127 png_fixed(png_ptr, green_Y, "cHRM Green Y"), | |
128 png_fixed(png_ptr, green_Z, "cHRM Green Z"), | |
129 png_fixed(png_ptr, blue_X, "cHRM Blue X"), | |
130 png_fixed(png_ptr, blue_Y, "cHRM Blue Y"), | |
131 png_fixed(png_ptr, blue_Z, "cHRM Blue Z")); | |
132 } | |
133 # endif /* FLOATING_POINT */ | |
134 | |
135 #endif /* cHRM */ | |
136 | |
137 #ifdef PNG_gAMA_SUPPORTED | |
138 void PNGFAPI | |
139 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
140 png_fixed_point file_gamma) | |
141 { | |
142 png_debug1(1, "in %s storage function", "gAMA"); | |
143 | |
144 if (png_ptr == NULL || info_ptr == NULL) | |
145 return; | |
146 | |
147 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); | |
148 png_colorspace_sync_info(png_ptr, info_ptr); | |
149 } | |
150 | |
151 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
152 void PNGAPI | |
153 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) | |
154 { | |
155 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, | |
156 "png_set_gAMA")); | |
157 } | |
158 # endif | |
159 #endif | |
160 | |
161 #ifdef PNG_hIST_SUPPORTED | |
162 void PNGAPI | |
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 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, | |
208 png_uint_32 width, png_uint_32 height, int bit_depth, | |
209 int color_type, int interlace_type, int compression_type, | |
210 int filter_type) | |
211 { | |
212 png_debug1(1, "in %s storage function", "IHDR"); | |
213 | |
214 if (png_ptr == NULL || info_ptr == NULL) | |
215 return; | |
216 | |
217 info_ptr->width = width; | |
218 info_ptr->height = height; | |
219 info_ptr->bit_depth = (png_byte)bit_depth; | |
220 info_ptr->color_type = (png_byte)color_type; | |
221 info_ptr->compression_type = (png_byte)compression_type; | |
222 info_ptr->filter_type = (png_byte)filter_type; | |
223 info_ptr->interlace_type = (png_byte)interlace_type; | |
224 | |
225 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, | |
226 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, | |
227 info_ptr->compression_type, info_ptr->filter_type); | |
228 | |
229 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
230 info_ptr->channels = 1; | |
231 | |
232 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0) | |
233 info_ptr->channels = 3; | |
234 | |
235 else | |
236 info_ptr->channels = 1; | |
237 | |
238 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0) | |
239 info_ptr->channels++; | |
240 | |
241 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); | |
242 | |
243 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); | |
244 } | |
245 | |
246 #ifdef PNG_oFFs_SUPPORTED | |
247 void PNGAPI | |
248 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, | |
249 png_int_32 offset_x, png_int_32 offset_y, int unit_type) | |
250 { | |
251 png_debug1(1, "in %s storage function", "oFFs"); | |
252 | |
253 if (png_ptr == NULL || info_ptr == NULL) | |
254 return; | |
255 | |
256 info_ptr->x_offset = offset_x; | |
257 info_ptr->y_offset = offset_y; | |
258 info_ptr->offset_unit_type = (png_byte)unit_type; | |
259 info_ptr->valid |= PNG_INFO_oFFs; | |
260 } | |
261 #endif | |
262 | |
263 #ifdef PNG_pCAL_SUPPORTED | |
264 void PNGAPI | |
265 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, | |
266 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, | |
267 int nparams, png_const_charp units, png_charpp params) | |
268 { | |
269 png_size_t length; | |
270 int i; | |
271 | |
272 png_debug1(1, "in %s storage function", "pCAL"); | |
273 | |
274 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL | |
275 || (nparams > 0 && params == NULL)) | |
276 return; | |
277 | |
278 length = strlen(purpose) + 1; | |
279 png_debug1(3, "allocating purpose for info (%lu bytes)", | |
280 (unsigned long)length); | |
281 | |
282 /* TODO: validate format of calibration name and unit name */ | |
283 | |
284 /* Check that the type matches the specification. */ | |
285 if (type < 0 || type > 3) | |
286 png_error(png_ptr, "Invalid pCAL equation type"); | |
287 | |
288 if (nparams < 0 || nparams > 255) | |
289 png_error(png_ptr, "Invalid pCAL parameter count"); | |
290 | |
291 /* Validate params[nparams] */ | |
292 for (i=0; i<nparams; ++i) | |
293 { | |
294 if (params[i] == NULL || | |
295 !png_check_fp_string(params[i], strlen(params[i]))) | |
296 png_error(png_ptr, "Invalid format for pCAL parameter"); | |
297 } | |
298 | |
299 info_ptr->pcal_purpose = png_voidcast(png_charp, | |
300 png_malloc_warn(png_ptr, length)); | |
301 | |
302 if (info_ptr->pcal_purpose == NULL) | |
303 { | |
304 png_warning(png_ptr, "Insufficient memory for pCAL purpose"); | |
305 | |
306 return; | |
307 } | |
308 | |
309 memcpy(info_ptr->pcal_purpose, purpose, length); | |
310 | |
311 png_debug(3, "storing X0, X1, type, and nparams in info"); | |
312 info_ptr->pcal_X0 = X0; | |
313 info_ptr->pcal_X1 = X1; | |
314 info_ptr->pcal_type = (png_byte)type; | |
315 info_ptr->pcal_nparams = (png_byte)nparams; | |
316 | |
317 length = strlen(units) + 1; | |
318 png_debug1(3, "allocating units for info (%lu bytes)", | |
319 (unsigned long)length); | |
320 | |
321 info_ptr->pcal_units = png_voidcast(png_charp, | |
322 png_malloc_warn(png_ptr, length)); | |
323 | |
324 if (info_ptr->pcal_units == NULL) | |
325 { | |
326 png_warning(png_ptr, "Insufficient memory for pCAL units"); | |
327 | |
328 return; | |
329 } | |
330 | |
331 memcpy(info_ptr->pcal_units, units, length); | |
332 | |
333 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, | |
334 (png_size_t)((nparams + 1) * (sizeof (png_charp))))); | |
335 | |
336 if (info_ptr->pcal_params == NULL) | |
337 { | |
338 png_warning(png_ptr, "Insufficient memory for pCAL params"); | |
339 | |
340 return; | |
341 } | |
342 | |
343 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); | |
344 | |
345 for (i = 0; i < nparams; i++) | |
346 { | |
347 length = strlen(params[i]) + 1; | |
348 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, | |
349 (unsigned long)length); | |
350 | |
351 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); | |
352 | |
353 if (info_ptr->pcal_params[i] == NULL) | |
354 { | |
355 png_warning(png_ptr, "Insufficient memory for pCAL parameter"); | |
356 | |
357 return; | |
358 } | |
359 | |
360 memcpy(info_ptr->pcal_params[i], params[i], length); | |
361 } | |
362 | |
363 info_ptr->valid |= PNG_INFO_pCAL; | |
364 info_ptr->free_me |= PNG_FREE_PCAL; | |
365 } | |
366 #endif | |
367 | |
368 #ifdef PNG_sCAL_SUPPORTED | |
369 void PNGAPI | |
370 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, | |
371 int unit, png_const_charp swidth, png_const_charp sheight) | |
372 { | |
373 png_size_t lengthw = 0, lengthh = 0; | |
374 | |
375 png_debug1(1, "in %s storage function", "sCAL"); | |
376 | |
377 if (png_ptr == NULL || info_ptr == NULL) | |
378 return; | |
379 | |
380 /* Double check the unit (should never get here with an invalid | |
381 * unit unless this is an API call.) | |
382 */ | |
383 if (unit != 1 && unit != 2) | |
384 png_error(png_ptr, "Invalid sCAL unit"); | |
385 | |
386 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || | |
387 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) | |
388 png_error(png_ptr, "Invalid sCAL width"); | |
389 | |
390 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || | |
391 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) | |
392 png_error(png_ptr, "Invalid sCAL height"); | |
393 | |
394 info_ptr->scal_unit = (png_byte)unit; | |
395 | |
396 ++lengthw; | |
397 | |
398 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); | |
399 | |
400 info_ptr->scal_s_width = png_voidcast(png_charp, | |
401 png_malloc_warn(png_ptr, lengthw)); | |
402 | |
403 if (info_ptr->scal_s_width == NULL) | |
404 { | |
405 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); | |
406 | |
407 return; | |
408 } | |
409 | |
410 memcpy(info_ptr->scal_s_width, swidth, lengthw); | |
411 | |
412 ++lengthh; | |
413 | |
414 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); | |
415 | |
416 info_ptr->scal_s_height = png_voidcast(png_charp, | |
417 png_malloc_warn(png_ptr, lengthh)); | |
418 | |
419 if (info_ptr->scal_s_height == NULL) | |
420 { | |
421 png_free (png_ptr, info_ptr->scal_s_width); | |
422 info_ptr->scal_s_width = NULL; | |
423 | |
424 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); | |
425 | |
426 return; | |
427 } | |
428 | |
429 memcpy(info_ptr->scal_s_height, sheight, lengthh); | |
430 | |
431 info_ptr->valid |= PNG_INFO_sCAL; | |
432 info_ptr->free_me |= PNG_FREE_SCAL; | |
433 } | |
434 | |
435 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
436 void PNGAPI | |
437 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, | |
438 double width, double height) | |
439 { | |
440 png_debug1(1, "in %s storage function", "sCAL"); | |
441 | |
442 /* Check the arguments. */ | |
443 if (width <= 0) | |
444 png_warning(png_ptr, "Invalid sCAL width ignored"); | |
445 | |
446 else if (height <= 0) | |
447 png_warning(png_ptr, "Invalid sCAL height ignored"); | |
448 | |
449 else | |
450 { | |
451 /* Convert 'width' and 'height' to ASCII. */ | |
452 char swidth[PNG_sCAL_MAX_DIGITS+1]; | |
453 char sheight[PNG_sCAL_MAX_DIGITS+1]; | |
454 | |
455 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, | |
456 PNG_sCAL_PRECISION); | |
457 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, | |
458 PNG_sCAL_PRECISION); | |
459 | |
460 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); | |
461 } | |
462 } | |
463 # endif | |
464 | |
465 # ifdef PNG_FIXED_POINT_SUPPORTED | |
466 void PNGAPI | |
467 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, | |
468 png_fixed_point width, png_fixed_point height) | |
469 { | |
470 png_debug1(1, "in %s storage function", "sCAL"); | |
471 | |
472 /* Check the arguments. */ | |
473 if (width <= 0) | |
474 png_warning(png_ptr, "Invalid sCAL width ignored"); | |
475 | |
476 else if (height <= 0) | |
477 png_warning(png_ptr, "Invalid sCAL height ignored"); | |
478 | |
479 else | |
480 { | |
481 /* Convert 'width' and 'height' to ASCII. */ | |
482 char swidth[PNG_sCAL_MAX_DIGITS+1]; | |
483 char sheight[PNG_sCAL_MAX_DIGITS+1]; | |
484 | |
485 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); | |
486 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); | |
487 | |
488 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); | |
489 } | |
490 } | |
491 # endif | |
492 #endif | |
493 | |
494 #ifdef PNG_pHYs_SUPPORTED | |
495 void PNGAPI | |
496 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, | |
497 png_uint_32 res_x, png_uint_32 res_y, int unit_type) | |
498 { | |
499 png_debug1(1, "in %s storage function", "pHYs"); | |
500 | |
501 if (png_ptr == NULL || info_ptr == NULL) | |
502 return; | |
503 | |
504 info_ptr->x_pixels_per_unit = res_x; | |
505 info_ptr->y_pixels_per_unit = res_y; | |
506 info_ptr->phys_unit_type = (png_byte)unit_type; | |
507 info_ptr->valid |= PNG_INFO_pHYs; | |
508 } | |
509 #endif | |
510 | |
511 void PNGAPI | |
512 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, | |
513 png_const_colorp palette, int num_palette) | |
514 { | |
515 | |
516 png_uint_32 max_palette_length; | |
517 | |
518 png_debug1(1, "in %s storage function", "PLTE"); | |
519 | |
520 if (png_ptr == NULL || info_ptr == NULL) | |
521 return; | |
522 | |
523 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ? | |
524 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH; | |
525 | |
526 if (num_palette < 0 || num_palette > (int) max_palette_length) | |
527 { | |
528 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
529 png_error(png_ptr, "Invalid palette length"); | |
530 | |
531 else | |
532 { | |
533 png_warning(png_ptr, "Invalid palette length"); | |
534 | |
535 return; | |
536 } | |
537 } | |
538 | |
539 if ((num_palette > 0 && palette == NULL) || | |
540 (num_palette == 0 | |
541 # ifdef PNG_MNG_FEATURES_SUPPORTED | |
542 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 | |
543 # endif | |
544 )) | |
545 { | |
546 png_error(png_ptr, "Invalid palette"); | |
547 } | |
548 | |
549 /* It may not actually be necessary to set png_ptr->palette here; | |
550 * we do it for backward compatibility with the way the png_handle_tRNS | |
551 * function used to do the allocation. | |
552 * | |
553 * 1.6.0: the above statement appears to be incorrect; something has to set | |
554 * the palette inside png_struct on read. | |
555 */ | |
556 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); | |
557 | |
558 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead | |
559 * of num_palette entries, in case of an invalid PNG file or incorrect | |
560 * call to png_set_PLTE() with too-large sample values. | |
561 */ | |
562 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, | |
563 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); | |
564 | |
565 if (num_palette > 0) | |
566 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); | |
567 info_ptr->palette = png_ptr->palette; | |
568 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; | |
569 | |
570 info_ptr->free_me |= PNG_FREE_PLTE; | |
571 | |
572 info_ptr->valid |= PNG_INFO_PLTE; | |
573 } | |
574 | |
575 #ifdef PNG_sBIT_SUPPORTED | |
576 void PNGAPI | |
577 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, | |
578 png_const_color_8p sig_bit) | |
579 { | |
580 png_debug1(1, "in %s storage function", "sBIT"); | |
581 | |
582 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) | |
583 return; | |
584 | |
585 info_ptr->sig_bit = *sig_bit; | |
586 info_ptr->valid |= PNG_INFO_sBIT; | |
587 } | |
588 #endif | |
589 | |
590 #ifdef PNG_sRGB_SUPPORTED | |
591 void PNGAPI | |
592 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) | |
593 { | |
594 png_debug1(1, "in %s storage function", "sRGB"); | |
595 | |
596 if (png_ptr == NULL || info_ptr == NULL) | |
597 return; | |
598 | |
599 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); | |
600 png_colorspace_sync_info(png_ptr, info_ptr); | |
601 } | |
602 | |
603 void PNGAPI | |
604 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, | |
605 int srgb_intent) | |
606 { | |
607 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); | |
608 | |
609 if (png_ptr == NULL || info_ptr == NULL) | |
610 return; | |
611 | |
612 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, | |
613 srgb_intent) != 0) | |
614 { | |
615 /* This causes the gAMA and cHRM to be written too */ | |
616 info_ptr->colorspace.flags |= | |
617 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; | |
618 } | |
619 | |
620 png_colorspace_sync_info(png_ptr, info_ptr); | |
621 } | |
622 #endif /* sRGB */ | |
623 | |
624 | |
625 #ifdef PNG_iCCP_SUPPORTED | |
626 void PNGAPI | |
627 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, | |
628 png_const_charp name, int compression_type, | |
629 png_const_bytep profile, png_uint_32 proflen) | |
630 { | |
631 png_charp new_iccp_name; | |
632 png_bytep new_iccp_profile; | |
633 png_size_t length; | |
634 | |
635 png_debug1(1, "in %s storage function", "iCCP"); | |
636 | |
637 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) | |
638 return; | |
639 | |
640 if (compression_type != PNG_COMPRESSION_TYPE_BASE) | |
641 png_app_error(png_ptr, "Invalid iCCP compression method"); | |
642 | |
643 /* Set the colorspace first because this validates the profile; do not | |
644 * override previously set app cHRM or gAMA here (because likely as not the | |
645 * application knows better than libpng what the correct values are.) Pass | |
646 * the info_ptr color_type field to png_colorspace_set_ICC because in the | |
647 * write case it has not yet been stored in png_ptr. | |
648 */ | |
649 { | |
650 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, | |
651 proflen, profile, info_ptr->color_type); | |
652 | |
653 png_colorspace_sync_info(png_ptr, info_ptr); | |
654 | |
655 /* Don't do any of the copying if the profile was bad, or inconsistent. */ | |
656 if (result == 0) | |
657 return; | |
658 | |
659 /* But do write the gAMA and cHRM chunks from the profile. */ | |
660 info_ptr->colorspace.flags |= | |
661 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; | |
662 } | |
663 | |
664 length = strlen(name)+1; | |
665 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); | |
666 | |
667 if (new_iccp_name == NULL) | |
668 { | |
669 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); | |
670 | |
671 return; | |
672 } | |
673 | |
674 memcpy(new_iccp_name, name, length); | |
675 new_iccp_profile = png_voidcast(png_bytep, | |
676 png_malloc_warn(png_ptr, proflen)); | |
677 | |
678 if (new_iccp_profile == NULL) | |
679 { | |
680 png_free(png_ptr, new_iccp_name); | |
681 png_benign_error(png_ptr, | |
682 "Insufficient memory to process iCCP profile"); | |
683 | |
684 return; | |
685 } | |
686 | |
687 memcpy(new_iccp_profile, profile, proflen); | |
688 | |
689 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); | |
690 | |
691 info_ptr->iccp_proflen = proflen; | |
692 info_ptr->iccp_name = new_iccp_name; | |
693 info_ptr->iccp_profile = new_iccp_profile; | |
694 info_ptr->free_me |= PNG_FREE_ICCP; | |
695 info_ptr->valid |= PNG_INFO_iCCP; | |
696 } | |
697 #endif | |
698 | |
699 #ifdef PNG_TEXT_SUPPORTED | |
700 void PNGAPI | |
701 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, | |
702 png_const_textp text_ptr, int num_text) | |
703 { | |
704 int ret; | |
705 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); | |
706 | |
707 if (ret != 0) | |
708 png_error(png_ptr, "Insufficient memory to store text"); | |
709 } | |
710 | |
711 int /* PRIVATE */ | |
712 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, | |
713 png_const_textp text_ptr, int num_text) | |
714 { | |
715 int i; | |
716 | |
717 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U : | |
718 (unsigned long)png_ptr->chunk_name); | |
719 | |
720 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) | |
721 return(0); | |
722 | |
723 /* Make sure we have enough space in the "text" array in info_struct | |
724 * to hold all of the incoming text_ptr objects. This compare can't overflow | |
725 * because max_text >= num_text (anyway, subtract of two positive integers | |
726 * can't overflow in any case.) | |
727 */ | |
728 if (num_text > info_ptr->max_text - info_ptr->num_text) | |
729 { | |
730 int old_num_text = info_ptr->num_text; | |
731 int max_text; | |
732 png_textp new_text = NULL; | |
733 | |
734 /* Calculate an appropriate max_text, checking for overflow. */ | |
735 max_text = old_num_text; | |
736 if (num_text <= INT_MAX - max_text) | |
737 { | |
738 max_text += num_text; | |
739 | |
740 /* Round up to a multiple of 8 */ | |
741 if (max_text < INT_MAX-8) | |
742 max_text = (max_text + 8) & ~0x7; | |
743 | |
744 else | |
745 max_text = INT_MAX; | |
746 | |
747 /* Now allocate a new array and copy the old members in; this does all | |
748 * the overflow checks. | |
749 */ | |
750 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, | |
751 info_ptr->text, old_num_text, max_text-old_num_text, | |
752 sizeof *new_text)); | |
753 } | |
754 | |
755 if (new_text == NULL) | |
756 { | |
757 png_chunk_report(png_ptr, "too many text chunks", | |
758 PNG_CHUNK_WRITE_ERROR); | |
759 | |
760 return 1; | |
761 } | |
762 | |
763 png_free(png_ptr, info_ptr->text); | |
764 | |
765 info_ptr->text = new_text; | |
766 info_ptr->free_me |= PNG_FREE_TEXT; | |
767 info_ptr->max_text = max_text; | |
768 /* num_text is adjusted below as the entries are copied in */ | |
769 | |
770 png_debug1(3, "allocated %d entries for info_ptr->text", max_text); | |
771 } | |
772 | |
773 for (i = 0; i < num_text; i++) | |
774 { | |
775 size_t text_length, key_len; | |
776 size_t lang_len, lang_key_len; | |
777 png_textp textp = &(info_ptr->text[info_ptr->num_text]); | |
778 | |
779 if (text_ptr[i].key == NULL) | |
780 continue; | |
781 | |
782 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || | |
783 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) | |
784 { | |
785 png_chunk_report(png_ptr, "text compression mode is out of range", | |
786 PNG_CHUNK_WRITE_ERROR); | |
787 continue; | |
788 } | |
789 | |
790 key_len = strlen(text_ptr[i].key); | |
791 | |
792 if (text_ptr[i].compression <= 0) | |
793 { | |
794 lang_len = 0; | |
795 lang_key_len = 0; | |
796 } | |
797 | |
798 else | |
799 # ifdef PNG_iTXt_SUPPORTED | |
800 { | |
801 /* Set iTXt data */ | |
802 | |
803 if (text_ptr[i].lang != NULL) | |
804 lang_len = strlen(text_ptr[i].lang); | |
805 | |
806 else | |
807 lang_len = 0; | |
808 | |
809 if (text_ptr[i].lang_key != NULL) | |
810 lang_key_len = strlen(text_ptr[i].lang_key); | |
811 | |
812 else | |
813 lang_key_len = 0; | |
814 } | |
815 # else /* iTXt */ | |
816 { | |
817 png_chunk_report(png_ptr, "iTXt chunk not supported", | |
818 PNG_CHUNK_WRITE_ERROR); | |
819 continue; | |
820 } | |
821 # endif | |
822 | |
823 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') | |
824 { | |
825 text_length = 0; | |
826 # ifdef PNG_iTXt_SUPPORTED | |
827 if (text_ptr[i].compression > 0) | |
828 textp->compression = PNG_ITXT_COMPRESSION_NONE; | |
829 | |
830 else | |
831 # endif | |
832 textp->compression = PNG_TEXT_COMPRESSION_NONE; | |
833 } | |
834 | |
835 else | |
836 { | |
837 text_length = strlen(text_ptr[i].text); | |
838 textp->compression = text_ptr[i].compression; | |
839 } | |
840 | |
841 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, | |
842 key_len + text_length + lang_len + lang_key_len + 4)); | |
843 | |
844 if (textp->key == NULL) | |
845 { | |
846 png_chunk_report(png_ptr, "text chunk: out of memory", | |
847 PNG_CHUNK_WRITE_ERROR); | |
848 | |
849 return 1; | |
850 } | |
851 | |
852 png_debug2(2, "Allocated %lu bytes at %p in png_set_text", | |
853 (unsigned long)(png_uint_32) | |
854 (key_len + lang_len + lang_key_len + text_length + 4), | |
855 textp->key); | |
856 | |
857 memcpy(textp->key, text_ptr[i].key, key_len); | |
858 *(textp->key + key_len) = '\0'; | |
859 | |
860 if (text_ptr[i].compression > 0) | |
861 { | |
862 textp->lang = textp->key + key_len + 1; | |
863 memcpy(textp->lang, text_ptr[i].lang, lang_len); | |
864 *(textp->lang + lang_len) = '\0'; | |
865 textp->lang_key = textp->lang + lang_len + 1; | |
866 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); | |
867 *(textp->lang_key + lang_key_len) = '\0'; | |
868 textp->text = textp->lang_key + lang_key_len + 1; | |
869 } | |
870 | |
871 else | |
872 { | |
873 textp->lang=NULL; | |
874 textp->lang_key=NULL; | |
875 textp->text = textp->key + key_len + 1; | |
876 } | |
877 | |
878 if (text_length != 0) | |
879 memcpy(textp->text, text_ptr[i].text, text_length); | |
880 | |
881 *(textp->text + text_length) = '\0'; | |
882 | |
883 # ifdef PNG_iTXt_SUPPORTED | |
884 if (textp->compression > 0) | |
885 { | |
886 textp->text_length = 0; | |
887 textp->itxt_length = text_length; | |
888 } | |
889 | |
890 else | |
891 # endif | |
892 { | |
893 textp->text_length = text_length; | |
894 textp->itxt_length = 0; | |
895 } | |
896 | |
897 info_ptr->num_text++; | |
898 png_debug1(3, "transferred text chunk %d", info_ptr->num_text); | |
899 } | |
900 | |
901 return(0); | |
902 } | |
903 #endif | |
904 | |
905 #ifdef PNG_tIME_SUPPORTED | |
906 void PNGAPI | |
907 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, | |
908 png_const_timep mod_time) | |
909 { | |
910 png_debug1(1, "in %s storage function", "tIME"); | |
911 | |
912 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || | |
913 (png_ptr->mode & PNG_WROTE_tIME) != 0) | |
914 return; | |
915 | |
916 if (mod_time->month == 0 || mod_time->month > 12 || | |
917 mod_time->day == 0 || mod_time->day > 31 || | |
918 mod_time->hour > 23 || mod_time->minute > 59 || | |
919 mod_time->second > 60) | |
920 { | |
921 png_warning(png_ptr, "Ignoring invalid time value"); | |
922 | |
923 return; | |
924 } | |
925 | |
926 info_ptr->mod_time = *mod_time; | |
927 info_ptr->valid |= PNG_INFO_tIME; | |
928 } | |
929 #endif | |
930 | |
931 #ifdef PNG_tRNS_SUPPORTED | |
932 void PNGAPI | |
933 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, | |
934 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) | |
935 { | |
936 png_debug1(1, "in %s storage function", "tRNS"); | |
937 | |
938 if (png_ptr == NULL || info_ptr == NULL) | |
939 | |
940 return; | |
941 | |
942 if (trans_alpha != NULL) | |
943 { | |
944 /* It may not actually be necessary to set png_ptr->trans_alpha here; | |
945 * we do it for backward compatibility with the way the png_handle_tRNS | |
946 * function used to do the allocation. | |
947 * | |
948 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively | |
949 * relies on png_set_tRNS storing the information in png_struct | |
950 * (otherwise it won't be there for the code in pngrtran.c). | |
951 */ | |
952 | |
953 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); | |
954 | |
955 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ | |
956 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, | |
957 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); | |
958 | |
959 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) | |
960 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); | |
961 } | |
962 | |
963 if (trans_color != NULL) | |
964 { | |
965 #ifdef PNG_WARNINGS_SUPPORTED | |
966 if (info_ptr->bit_depth < 16) | |
967 { | |
968 int sample_max = (1 << info_ptr->bit_depth) - 1; | |
969 | |
970 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && | |
971 trans_color->gray > sample_max) || | |
972 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && | |
973 (trans_color->red > sample_max || | |
974 trans_color->green > sample_max || | |
975 trans_color->blue > sample_max))) | |
976 png_warning(png_ptr, | |
977 "tRNS chunk has out-of-range samples for bit_depth"); | |
978 } | |
979 #endif | |
980 | |
981 info_ptr->trans_color = *trans_color; | |
982 | |
983 if (num_trans == 0) | |
984 num_trans = 1; | |
985 } | |
986 | |
987 info_ptr->num_trans = (png_uint_16)num_trans; | |
988 | |
989 if (num_trans != 0) | |
990 { | |
991 info_ptr->valid |= PNG_INFO_tRNS; | |
992 info_ptr->free_me |= PNG_FREE_TRNS; | |
993 } | |
994 } | |
995 #endif | |
996 | |
997 #ifdef PNG_sPLT_SUPPORTED | |
998 void PNGAPI | |
999 png_set_sPLT(png_const_structrp png_ptr, | |
1000 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) | |
1001 /* | |
1002 * entries - array of png_sPLT_t structures | |
1003 * to be added to the list of palettes | |
1004 * in the info structure. | |
1005 * | |
1006 * nentries - number of palette structures to be | |
1007 * added. | |
1008 */ | |
1009 { | |
1010 png_sPLT_tp np; | |
1011 | |
1012 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) | |
1013 return; | |
1014 | |
1015 /* Use the internal realloc function, which checks for all the possible | |
1016 * overflows. Notice that the parameters are (int) and (size_t) | |
1017 */ | |
1018 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, | |
1019 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, | |
1020 sizeof *np)); | |
1021 | |
1022 if (np == NULL) | |
1023 { | |
1024 /* Out of memory or too many chunks */ | |
1025 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); | |
1026 | |
1027 return; | |
1028 } | |
1029 | |
1030 png_free(png_ptr, info_ptr->splt_palettes); | |
1031 info_ptr->splt_palettes = np; | |
1032 info_ptr->free_me |= PNG_FREE_SPLT; | |
1033 | |
1034 np += info_ptr->splt_palettes_num; | |
1035 | |
1036 do | |
1037 { | |
1038 png_size_t length; | |
1039 | |
1040 /* Skip invalid input entries */ | |
1041 if (entries->name == NULL || entries->entries == NULL) | |
1042 { | |
1043 /* png_handle_sPLT doesn't do this, so this is an app error */ | |
1044 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); | |
1045 /* Just skip the invalid entry */ | |
1046 continue; | |
1047 } | |
1048 | |
1049 np->depth = entries->depth; | |
1050 | |
1051 /* In the event of out-of-memory just return - there's no point keeping | |
1052 * on trying to add sPLT chunks. | |
1053 */ | |
1054 length = strlen(entries->name) + 1; | |
1055 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); | |
1056 | |
1057 if (np->name == NULL) | |
1058 break; | |
1059 | |
1060 memcpy(np->name, entries->name, length); | |
1061 | |
1062 /* IMPORTANT: we have memory now that won't get freed if something else | |
1063 * goes wrong; this code must free it. png_malloc_array produces no | |
1064 * warnings; use a png_chunk_report (below) if there is an error. | |
1065 */ | |
1066 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, | |
1067 entries->nentries, sizeof (png_sPLT_entry))); | |
1068 | |
1069 if (np->entries == NULL) | |
1070 { | |
1071 png_free(png_ptr, np->name); | |
1072 np->name = NULL; | |
1073 break; | |
1074 } | |
1075 | |
1076 np->nentries = entries->nentries; | |
1077 /* This multiply can't overflow because png_malloc_array has already | |
1078 * checked it when doing the allocation. | |
1079 */ | |
1080 memcpy(np->entries, entries->entries, | |
1081 entries->nentries * sizeof (png_sPLT_entry)); | |
1082 | |
1083 /* Note that 'continue' skips the advance of the out pointer and out | |
1084 * count, so an invalid entry is not added. | |
1085 */ | |
1086 info_ptr->valid |= PNG_INFO_sPLT; | |
1087 ++(info_ptr->splt_palettes_num); | |
1088 ++np; | |
1089 } | |
1090 while (++entries, --nentries); | |
1091 | |
1092 if (nentries > 0) | |
1093 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); | |
1094 } | |
1095 #endif /* sPLT */ | |
1096 | |
1097 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED | |
1098 static png_byte | |
1099 check_location(png_const_structrp png_ptr, int location) | |
1100 { | |
1101 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); | |
1102 | |
1103 /* New in 1.6.0; copy the location and check it. This is an API | |
1104 * change; previously the app had to use the | |
1105 * png_set_unknown_chunk_location API below for each chunk. | |
1106 */ | |
1107 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0) | |
1108 { | |
1109 /* Write struct, so unknown chunks come from the app */ | |
1110 png_app_warning(png_ptr, | |
1111 "png_set_unknown_chunks now expects a valid location"); | |
1112 /* Use the old behavior */ | |
1113 location = (png_byte)(png_ptr->mode & | |
1114 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); | |
1115 } | |
1116 | |
1117 /* This need not be an internal error - if the app calls | |
1118 * png_set_unknown_chunks on a read pointer it must get the location right. | |
1119 */ | |
1120 if (location == 0) | |
1121 png_error(png_ptr, "invalid location in png_set_unknown_chunks"); | |
1122 | |
1123 /* Now reduce the location to the top-most set bit by removing each least | |
1124 * significant bit in turn. | |
1125 */ | |
1126 while (location != (location & -location)) | |
1127 location &= ~(location & -location); | |
1128 | |
1129 /* The cast is safe because 'location' is a bit mask and only the low four | |
1130 * bits are significant. | |
1131 */ | |
1132 return (png_byte)location; | |
1133 } | |
1134 | |
1135 void PNGAPI | |
1136 png_set_unknown_chunks(png_const_structrp png_ptr, | |
1137 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) | |
1138 { | |
1139 png_unknown_chunkp np; | |
1140 | |
1141 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || | |
1142 unknowns == NULL) | |
1143 return; | |
1144 | |
1145 /* Check for the failure cases where support has been disabled at compile | |
1146 * time. This code is hardly ever compiled - it's here because | |
1147 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this | |
1148 * code) but may be meaningless if the read or write handling of unknown | |
1149 * chunks is not compiled in. | |
1150 */ | |
1151 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ | |
1152 defined(PNG_READ_SUPPORTED) | |
1153 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) | |
1154 { | |
1155 png_app_error(png_ptr, "no unknown chunk support on read"); | |
1156 | |
1157 return; | |
1158 } | |
1159 # endif | |
1160 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ | |
1161 defined(PNG_WRITE_SUPPORTED) | |
1162 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) | |
1163 { | |
1164 png_app_error(png_ptr, "no unknown chunk support on write"); | |
1165 | |
1166 return; | |
1167 } | |
1168 # endif | |
1169 | |
1170 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that | |
1171 * unknown critical chunks could be lost with just a warning resulting in | |
1172 * undefined behavior. Now png_chunk_report is used to provide behavior | |
1173 * appropriate to read or write. | |
1174 */ | |
1175 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, | |
1176 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, | |
1177 sizeof *np)); | |
1178 | |
1179 if (np == NULL) | |
1180 { | |
1181 png_chunk_report(png_ptr, "too many unknown chunks", | |
1182 PNG_CHUNK_WRITE_ERROR); | |
1183 | |
1184 return; | |
1185 } | |
1186 | |
1187 png_free(png_ptr, info_ptr->unknown_chunks); | |
1188 info_ptr->unknown_chunks = np; /* safe because it is initialized */ | |
1189 info_ptr->free_me |= PNG_FREE_UNKN; | |
1190 | |
1191 np += info_ptr->unknown_chunks_num; | |
1192 | |
1193 /* Increment unknown_chunks_num each time round the loop to protect the | |
1194 * just-allocated chunk data. | |
1195 */ | |
1196 for (; num_unknowns > 0; --num_unknowns, ++unknowns) | |
1197 { | |
1198 memcpy(np->name, unknowns->name, (sizeof np->name)); | |
1199 np->name[(sizeof np->name)-1] = '\0'; | |
1200 np->location = check_location(png_ptr, unknowns->location); | |
1201 | |
1202 if (unknowns->size == 0) | |
1203 { | |
1204 np->data = NULL; | |
1205 np->size = 0; | |
1206 } | |
1207 | |
1208 else | |
1209 { | |
1210 np->data = png_voidcast(png_bytep, | |
1211 png_malloc_base(png_ptr, unknowns->size)); | |
1212 | |
1213 if (np->data == NULL) | |
1214 { | |
1215 png_chunk_report(png_ptr, "unknown chunk: out of memory", | |
1216 PNG_CHUNK_WRITE_ERROR); | |
1217 /* But just skip storing the unknown chunk */ | |
1218 continue; | |
1219 } | |
1220 | |
1221 memcpy(np->data, unknowns->data, unknowns->size); | |
1222 np->size = unknowns->size; | |
1223 } | |
1224 | |
1225 /* These increments are skipped on out-of-memory for the data - the | |
1226 * unknown chunk entry gets overwritten if the png_chunk_report returns. | |
1227 * This is correct in the read case (the chunk is just dropped.) | |
1228 */ | |
1229 ++np; | |
1230 ++(info_ptr->unknown_chunks_num); | |
1231 } | |
1232 } | |
1233 | |
1234 void PNGAPI | |
1235 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, | |
1236 int chunk, int location) | |
1237 { | |
1238 /* This API is pretty pointless in 1.6.0 because the location can be set | |
1239 * before the call to png_set_unknown_chunks. | |
1240 * | |
1241 * TODO: add a png_app_warning in 1.7 | |
1242 */ | |
1243 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && | |
1244 chunk < info_ptr->unknown_chunks_num) | |
1245 { | |
1246 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) | |
1247 { | |
1248 png_app_error(png_ptr, "invalid unknown chunk location"); | |
1249 /* Fake out the pre 1.6.0 behavior: */ | |
1250 if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */ | |
1251 location = PNG_AFTER_IDAT; | |
1252 | |
1253 else | |
1254 location = PNG_HAVE_IHDR; /* also undocumented */ | |
1255 } | |
1256 | |
1257 info_ptr->unknown_chunks[chunk].location = | |
1258 check_location(png_ptr, location); | |
1259 } | |
1260 } | |
1261 #endif /* STORE_UNKNOWN_CHUNKS */ | |
1262 | |
1263 #ifdef PNG_MNG_FEATURES_SUPPORTED | |
1264 png_uint_32 PNGAPI | |
1265 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) | |
1266 { | |
1267 png_debug(1, "in png_permit_mng_features"); | |
1268 | |
1269 if (png_ptr == NULL) | |
1270 return 0; | |
1271 | |
1272 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; | |
1273 | |
1274 return png_ptr->mng_features_permitted; | |
1275 } | |
1276 #endif | |
1277 | |
1278 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED | |
1279 static unsigned int | |
1280 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) | |
1281 { | |
1282 unsigned int i; | |
1283 | |
1284 /* Utility function: update the 'keep' state of a chunk if it is already in | |
1285 * the list, otherwise add it to the list. | |
1286 */ | |
1287 for (i=0; i<count; ++i, list += 5) | |
1288 { | |
1289 if (memcmp(list, add, 4) == 0) | |
1290 { | |
1291 list[4] = (png_byte)keep; | |
1292 | |
1293 return count; | |
1294 } | |
1295 } | |
1296 | |
1297 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) | |
1298 { | |
1299 ++count; | |
1300 memcpy(list, add, 4); | |
1301 list[4] = (png_byte)keep; | |
1302 } | |
1303 | |
1304 return count; | |
1305 } | |
1306 | |
1307 void PNGAPI | |
1308 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, | |
1309 png_const_bytep chunk_list, int num_chunks_in) | |
1310 { | |
1311 png_bytep new_list; | |
1312 unsigned int num_chunks, old_num_chunks; | |
1313 | |
1314 if (png_ptr == NULL) | |
1315 return; | |
1316 | |
1317 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) | |
1318 { | |
1319 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); | |
1320 | |
1321 return; | |
1322 } | |
1323 | |
1324 if (num_chunks_in <= 0) | |
1325 { | |
1326 png_ptr->unknown_default = keep; | |
1327 | |
1328 /* '0' means just set the flags, so stop here */ | |
1329 if (num_chunks_in == 0) | |
1330 return; | |
1331 } | |
1332 | |
1333 if (num_chunks_in < 0) | |
1334 { | |
1335 /* Ignore all unknown chunks and all chunks recognized by | |
1336 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND | |
1337 */ | |
1338 static PNG_CONST png_byte chunks_to_ignore[] = { | |
1339 98, 75, 71, 68, '\0', /* bKGD */ | |
1340 99, 72, 82, 77, '\0', /* cHRM */ | |
1341 103, 65, 77, 65, '\0', /* gAMA */ | |
1342 104, 73, 83, 84, '\0', /* hIST */ | |
1343 105, 67, 67, 80, '\0', /* iCCP */ | |
1344 105, 84, 88, 116, '\0', /* iTXt */ | |
1345 111, 70, 70, 115, '\0', /* oFFs */ | |
1346 112, 67, 65, 76, '\0', /* pCAL */ | |
1347 112, 72, 89, 115, '\0', /* pHYs */ | |
1348 115, 66, 73, 84, '\0', /* sBIT */ | |
1349 115, 67, 65, 76, '\0', /* sCAL */ | |
1350 115, 80, 76, 84, '\0', /* sPLT */ | |
1351 115, 84, 69, 82, '\0', /* sTER */ | |
1352 115, 82, 71, 66, '\0', /* sRGB */ | |
1353 116, 69, 88, 116, '\0', /* tEXt */ | |
1354 116, 73, 77, 69, '\0', /* tIME */ | |
1355 122, 84, 88, 116, '\0' /* zTXt */ | |
1356 }; | |
1357 | |
1358 chunk_list = chunks_to_ignore; | |
1359 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U; | |
1360 } | |
1361 | |
1362 else /* num_chunks_in > 0 */ | |
1363 { | |
1364 if (chunk_list == NULL) | |
1365 { | |
1366 /* Prior to 1.6.0 this was silently ignored, now it is an app_error | |
1367 * which can be switched off. | |
1368 */ | |
1369 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); | |
1370 | |
1371 return; | |
1372 } | |
1373 | |
1374 num_chunks = num_chunks_in; | |
1375 } | |
1376 | |
1377 old_num_chunks = png_ptr->num_chunk_list; | |
1378 if (png_ptr->chunk_list == NULL) | |
1379 old_num_chunks = 0; | |
1380 | |
1381 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. | |
1382 */ | |
1383 if (num_chunks + old_num_chunks > UINT_MAX/5) | |
1384 { | |
1385 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); | |
1386 | |
1387 return; | |
1388 } | |
1389 | |
1390 /* If these chunks are being reset to the default then no more memory is | |
1391 * required because add_one_chunk above doesn't extend the list if the 'keep' | |
1392 * parameter is the default. | |
1393 */ | |
1394 if (keep != 0) | |
1395 { | |
1396 new_list = png_voidcast(png_bytep, png_malloc(png_ptr, | |
1397 5 * (num_chunks + old_num_chunks))); | |
1398 | |
1399 if (old_num_chunks > 0) | |
1400 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); | |
1401 } | |
1402 | |
1403 else if (old_num_chunks > 0) | |
1404 new_list = png_ptr->chunk_list; | |
1405 | |
1406 else | |
1407 new_list = NULL; | |
1408 | |
1409 /* Add the new chunks together with each one's handling code. If the chunk | |
1410 * already exists the code is updated, otherwise the chunk is added to the | |
1411 * end. (In libpng 1.6.0 order no longer matters because this code enforces | |
1412 * the earlier convention that the last setting is the one that is used.) | |
1413 */ | |
1414 if (new_list != NULL) | |
1415 { | |
1416 png_const_bytep inlist; | |
1417 png_bytep outlist; | |
1418 unsigned int i; | |
1419 | |
1420 for (i=0; i<num_chunks; ++i) | |
1421 { | |
1422 old_num_chunks = add_one_chunk(new_list, old_num_chunks, | |
1423 chunk_list+5*i, keep); | |
1424 } | |
1425 | |
1426 /* Now remove any spurious 'default' entries. */ | |
1427 num_chunks = 0; | |
1428 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5) | |
1429 { | |
1430 if (inlist[4]) | |
1431 { | |
1432 if (outlist != inlist) | |
1433 memcpy(outlist, inlist, 5); | |
1434 outlist += 5; | |
1435 ++num_chunks; | |
1436 } | |
1437 } | |
1438 | |
1439 /* This means the application has removed all the specialized handling. */ | |
1440 if (num_chunks == 0) | |
1441 { | |
1442 if (png_ptr->chunk_list != new_list) | |
1443 png_free(png_ptr, new_list); | |
1444 | |
1445 new_list = NULL; | |
1446 } | |
1447 } | |
1448 | |
1449 else | |
1450 num_chunks = 0; | |
1451 | |
1452 png_ptr->num_chunk_list = num_chunks; | |
1453 | |
1454 if (png_ptr->chunk_list != new_list) | |
1455 { | |
1456 if (png_ptr->chunk_list != NULL) | |
1457 png_free(png_ptr, png_ptr->chunk_list); | |
1458 | |
1459 png_ptr->chunk_list = new_list; | |
1460 } | |
1461 } | |
1462 #endif | |
1463 | |
1464 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED | |
1465 void PNGAPI | |
1466 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, | |
1467 png_user_chunk_ptr read_user_chunk_fn) | |
1468 { | |
1469 png_debug(1, "in png_set_read_user_chunk_fn"); | |
1470 | |
1471 if (png_ptr == NULL) | |
1472 return; | |
1473 | |
1474 png_ptr->read_user_chunk_fn = read_user_chunk_fn; | |
1475 png_ptr->user_chunk_ptr = user_chunk_ptr; | |
1476 } | |
1477 #endif | |
1478 | |
1479 #ifdef PNG_INFO_IMAGE_SUPPORTED | |
1480 void PNGAPI | |
1481 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, | |
1482 png_bytepp row_pointers) | |
1483 { | |
1484 png_debug1(1, "in %s storage function", "rows"); | |
1485 | |
1486 if (png_ptr == NULL || info_ptr == NULL) | |
1487 return; | |
1488 | |
1489 if (info_ptr->row_pointers != NULL && | |
1490 (info_ptr->row_pointers != row_pointers)) | |
1491 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); | |
1492 | |
1493 info_ptr->row_pointers = row_pointers; | |
1494 | |
1495 if (row_pointers != NULL) | |
1496 info_ptr->valid |= PNG_INFO_IDAT; | |
1497 } | |
1498 #endif | |
1499 | |
1500 void PNGAPI | |
1501 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) | |
1502 { | |
1503 if (png_ptr == NULL) | |
1504 return; | |
1505 | |
1506 if (size == 0 || size > PNG_UINT_31_MAX) | |
1507 png_error(png_ptr, "invalid compression buffer size"); | |
1508 | |
1509 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
1510 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) | |
1511 { | |
1512 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ | |
1513 return; | |
1514 } | |
1515 # endif | |
1516 | |
1517 # ifdef PNG_WRITE_SUPPORTED | |
1518 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) | |
1519 { | |
1520 if (png_ptr->zowner != 0) | |
1521 { | |
1522 png_warning(png_ptr, | |
1523 "Compression buffer size cannot be changed because it is in use"); | |
1524 | |
1525 return; | |
1526 } | |
1527 | |
1528 #ifndef __COVERITY__ | |
1529 /* Some compilers complain that this is always false. However, it | |
1530 * can be true when integer overflow happens. | |
1531 */ | |
1532 if (size > ZLIB_IO_MAX) | |
1533 { | |
1534 png_warning(png_ptr, | |
1535 "Compression buffer size limited to system maximum"); | |
1536 size = ZLIB_IO_MAX; /* must fit */ | |
1537 } | |
1538 #endif | |
1539 | |
1540 if (size < 6) | |
1541 { | |
1542 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH | |
1543 * if this is permitted. | |
1544 */ | |
1545 png_warning(png_ptr, | |
1546 "Compression buffer size cannot be reduced below 6"); | |
1547 | |
1548 return; | |
1549 } | |
1550 | |
1551 if (png_ptr->zbuffer_size != size) | |
1552 { | |
1553 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); | |
1554 png_ptr->zbuffer_size = (uInt)size; | |
1555 } | |
1556 } | |
1557 # endif | |
1558 } | |
1559 | |
1560 void PNGAPI | |
1561 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) | |
1562 { | |
1563 if (png_ptr != NULL && info_ptr != NULL) | |
1564 info_ptr->valid &= ~mask; | |
1565 } | |
1566 | |
1567 | |
1568 #ifdef PNG_SET_USER_LIMITS_SUPPORTED | |
1569 /* This function was added to libpng 1.2.6 */ | |
1570 void PNGAPI | |
1571 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, | |
1572 png_uint_32 user_height_max) | |
1573 { | |
1574 /* Images with dimensions larger than these limits will be | |
1575 * rejected by png_set_IHDR(). To accept any PNG datastream | |
1576 * regardless of dimensions, set both limits to 0x7fffffff. | |
1577 */ | |
1578 if (png_ptr == NULL) | |
1579 return; | |
1580 | |
1581 png_ptr->user_width_max = user_width_max; | |
1582 png_ptr->user_height_max = user_height_max; | |
1583 } | |
1584 | |
1585 /* This function was added to libpng 1.4.0 */ | |
1586 void PNGAPI | |
1587 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) | |
1588 { | |
1589 if (png_ptr != NULL) | |
1590 png_ptr->user_chunk_cache_max = user_chunk_cache_max; | |
1591 } | |
1592 | |
1593 /* This function was added to libpng 1.4.1 */ | |
1594 void PNGAPI | |
1595 png_set_chunk_malloc_max (png_structrp png_ptr, | |
1596 png_alloc_size_t user_chunk_malloc_max) | |
1597 { | |
1598 if (png_ptr != NULL) | |
1599 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; | |
1600 } | |
1601 #endif /* ?SET_USER_LIMITS */ | |
1602 | |
1603 | |
1604 #ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
1605 void PNGAPI | |
1606 png_set_benign_errors(png_structrp png_ptr, int allowed) | |
1607 { | |
1608 png_debug(1, "in png_set_benign_errors"); | |
1609 | |
1610 /* If allowed is 1, png_benign_error() is treated as a warning. | |
1611 * | |
1612 * If allowed is 0, png_benign_error() is treated as an error (which | |
1613 * is the default behavior if png_set_benign_errors() is not called). | |
1614 */ | |
1615 | |
1616 if (allowed != 0) | |
1617 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | | |
1618 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; | |
1619 | |
1620 else | |
1621 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | | |
1622 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); | |
1623 } | |
1624 #endif /* BENIGN_ERRORS */ | |
1625 | |
1626 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED | |
1627 /* Whether to report invalid palette index; added at libng-1.5.10. | |
1628 * It is possible for an indexed (color-type==3) PNG file to contain | |
1629 * pixels with invalid (out-of-range) indexes if the PLTE chunk has | |
1630 * fewer entries than the image's bit-depth would allow. We recover | |
1631 * from this gracefully by filling any incomplete palette with zeros | |
1632 * (opaque black). By default, when this occurs libpng will issue | |
1633 * a benign error. This API can be used to override that behavior. | |
1634 */ | |
1635 void PNGAPI | |
1636 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) | |
1637 { | |
1638 png_debug(1, "in png_set_check_for_invalid_index"); | |
1639 | |
1640 if (allowed > 0) | |
1641 png_ptr->num_palette_max = 0; | |
1642 | |
1643 else | |
1644 png_ptr->num_palette_max = -1; | |
1645 } | |
1646 #endif | |
1647 #endif /* READ || WRITE */ | |
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