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view libs/libpng/pngset.c @ 13:ea928c313344
foo
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Mon, 28 Sep 2015 19:04:50 +0300 |
| parents | |
| children |
line source
2 /* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.2.30 [August 15, 2008]
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 *
10 * The functions here are used during reads to store data from the file
11 * into the info struct, and during writes to store application data
12 * into the info struct for writing into the file. This abstracts the
13 * info struct and allows us to change the structure in the future.
14 */
16 #define PNG_INTERNAL
17 #include "png.h"
18 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
20 #if defined(PNG_bKGD_SUPPORTED)
21 void PNGAPI
22 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
23 {
24 png_debug1(1, "in %s storage function\n", "bKGD");
25 if (png_ptr == NULL || info_ptr == NULL)
26 return;
28 png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
29 info_ptr->valid |= PNG_INFO_bKGD;
30 }
31 #endif
33 #if defined(PNG_cHRM_SUPPORTED)
34 #ifdef PNG_FLOATING_POINT_SUPPORTED
35 void PNGAPI
36 png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
37 double white_x, double white_y, double red_x, double red_y,
38 double green_x, double green_y, double blue_x, double blue_y)
39 {
40 png_debug1(1, "in %s storage function\n", "cHRM");
41 if (png_ptr == NULL || info_ptr == NULL)
42 return;
43 if (!(white_x || white_y || red_x || red_y || green_x || green_y ||
44 blue_x || blue_y))
45 {
46 png_warning(png_ptr,
47 "Ignoring attempt to set all-zero chromaticity values");
48 return;
49 }
50 if (white_x < 0.0 || white_y < 0.0 ||
51 red_x < 0.0 || red_y < 0.0 ||
52 green_x < 0.0 || green_y < 0.0 ||
53 blue_x < 0.0 || blue_y < 0.0)
54 {
55 png_warning(png_ptr,
56 "Ignoring attempt to set negative chromaticity value");
57 return;
58 }
59 if (white_x > 21474.83 || white_y > 21474.83 ||
60 red_x > 21474.83 || red_y > 21474.83 ||
61 green_x > 21474.83 || green_y > 21474.83 ||
62 blue_x > 21474.83 || blue_y > 21474.83)
63 {
64 png_warning(png_ptr,
65 "Ignoring attempt to set chromaticity value exceeding 21474.83");
66 return;
67 }
69 info_ptr->x_white = (float)white_x;
70 info_ptr->y_white = (float)white_y;
71 info_ptr->x_red = (float)red_x;
72 info_ptr->y_red = (float)red_y;
73 info_ptr->x_green = (float)green_x;
74 info_ptr->y_green = (float)green_y;
75 info_ptr->x_blue = (float)blue_x;
76 info_ptr->y_blue = (float)blue_y;
77 #ifdef PNG_FIXED_POINT_SUPPORTED
78 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
79 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
80 info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5);
81 info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5);
82 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
83 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
84 info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5);
85 info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5);
86 #endif
87 info_ptr->valid |= PNG_INFO_cHRM;
88 }
89 #endif
90 #ifdef PNG_FIXED_POINT_SUPPORTED
91 void PNGAPI
92 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
93 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
94 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
95 png_fixed_point blue_x, png_fixed_point blue_y)
96 {
97 png_debug1(1, "in %s storage function\n", "cHRM");
98 if (png_ptr == NULL || info_ptr == NULL)
99 return;
101 if (!(white_x || white_y || red_x || red_y || green_x || green_y ||
102 blue_x || blue_y))
103 {
104 png_warning(png_ptr,
105 "Ignoring attempt to set all-zero chromaticity values");
106 return;
107 }
108 if (white_x < 0 || white_y < 0 ||
109 red_x < 0 || red_y < 0 ||
110 green_x < 0 || green_y < 0 ||
111 blue_x < 0 || blue_y < 0)
112 {
113 png_warning(png_ptr,
114 "Ignoring attempt to set negative chromaticity value");
115 return;
116 }
117 if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
118 white_y > (png_fixed_point) PNG_UINT_31_MAX ||
119 red_x > (png_fixed_point) PNG_UINT_31_MAX ||
120 red_y > (png_fixed_point) PNG_UINT_31_MAX ||
121 green_x > (png_fixed_point) PNG_UINT_31_MAX ||
122 green_y > (png_fixed_point) PNG_UINT_31_MAX ||
123 blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
124 blue_y > (png_fixed_point) PNG_UINT_31_MAX )
125 {
126 png_warning(png_ptr,
127 "Ignoring attempt to set chromaticity value exceeding 21474.83");
128 return;
129 }
130 info_ptr->int_x_white = white_x;
131 info_ptr->int_y_white = white_y;
132 info_ptr->int_x_red = red_x;
133 info_ptr->int_y_red = red_y;
134 info_ptr->int_x_green = green_x;
135 info_ptr->int_y_green = green_y;
136 info_ptr->int_x_blue = blue_x;
137 info_ptr->int_y_blue = blue_y;
138 #ifdef PNG_FLOATING_POINT_SUPPORTED
139 info_ptr->x_white = (float)(white_x/100000.);
140 info_ptr->y_white = (float)(white_y/100000.);
141 info_ptr->x_red = (float)( red_x/100000.);
142 info_ptr->y_red = (float)( red_y/100000.);
143 info_ptr->x_green = (float)(green_x/100000.);
144 info_ptr->y_green = (float)(green_y/100000.);
145 info_ptr->x_blue = (float)( blue_x/100000.);
146 info_ptr->y_blue = (float)( blue_y/100000.);
147 #endif
148 info_ptr->valid |= PNG_INFO_cHRM;
149 }
150 #endif
151 #endif
153 #if defined(PNG_gAMA_SUPPORTED)
154 #ifdef PNG_FLOATING_POINT_SUPPORTED
155 void PNGAPI
156 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
157 {
158 double gamma;
159 png_debug1(1, "in %s storage function\n", "gAMA");
160 if (png_ptr == NULL || info_ptr == NULL)
161 return;
163 /* Check for overflow */
164 if (file_gamma > 21474.83)
165 {
166 png_warning(png_ptr, "Limiting gamma to 21474.83");
167 gamma=21474.83;
168 }
169 else
170 gamma = file_gamma;
171 info_ptr->gamma = (float)gamma;
172 #ifdef PNG_FIXED_POINT_SUPPORTED
173 info_ptr->int_gamma = (int)(gamma*100000.+.5);
174 #endif
175 info_ptr->valid |= PNG_INFO_gAMA;
176 if (gamma == 0.0)
177 png_warning(png_ptr, "Setting gamma=0");
178 }
179 #endif
180 void PNGAPI
181 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
182 int_gamma)
183 {
184 png_fixed_point gamma;
186 png_debug1(1, "in %s storage function\n", "gAMA");
187 if (png_ptr == NULL || info_ptr == NULL)
188 return;
190 if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
191 {
192 png_warning(png_ptr, "Limiting gamma to 21474.83");
193 gamma=PNG_UINT_31_MAX;
194 }
195 else
196 {
197 if (int_gamma < 0)
198 {
199 png_warning(png_ptr, "Setting negative gamma to zero");
200 gamma = 0;
201 }
202 else
203 gamma = int_gamma;
204 }
205 #ifdef PNG_FLOATING_POINT_SUPPORTED
206 info_ptr->gamma = (float)(gamma/100000.);
207 #endif
208 #ifdef PNG_FIXED_POINT_SUPPORTED
209 info_ptr->int_gamma = gamma;
210 #endif
211 info_ptr->valid |= PNG_INFO_gAMA;
212 if (gamma == 0)
213 png_warning(png_ptr, "Setting gamma=0");
214 }
215 #endif
217 #if defined(PNG_hIST_SUPPORTED)
218 void PNGAPI
219 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
220 {
221 int i;
223 png_debug1(1, "in %s storage function\n", "hIST");
224 if (png_ptr == NULL || info_ptr == NULL)
225 return;
226 if (info_ptr->num_palette == 0 || info_ptr->num_palette
227 > PNG_MAX_PALETTE_LENGTH)
228 {
229 png_warning(png_ptr,
230 "Invalid palette size, hIST allocation skipped.");
231 return;
232 }
234 #ifdef PNG_FREE_ME_SUPPORTED
235 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
236 #endif
237 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
238 1.2.1 */
239 png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
240 (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));
241 if (png_ptr->hist == NULL)
242 {
243 png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
244 return;
245 }
247 for (i = 0; i < info_ptr->num_palette; i++)
248 png_ptr->hist[i] = hist[i];
249 info_ptr->hist = png_ptr->hist;
250 info_ptr->valid |= PNG_INFO_hIST;
252 #ifdef PNG_FREE_ME_SUPPORTED
253 info_ptr->free_me |= PNG_FREE_HIST;
254 #else
255 png_ptr->flags |= PNG_FLAG_FREE_HIST;
256 #endif
257 }
258 #endif
260 void PNGAPI
261 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
262 png_uint_32 width, png_uint_32 height, int bit_depth,
263 int color_type, int interlace_type, int compression_type,
264 int filter_type)
265 {
266 png_debug1(1, "in %s storage function\n", "IHDR");
267 if (png_ptr == NULL || info_ptr == NULL)
268 return;
270 /* check for width and height valid values */
271 if (width == 0 || height == 0)
272 png_error(png_ptr, "Image width or height is zero in IHDR");
273 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
274 if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
275 png_error(png_ptr, "image size exceeds user limits in IHDR");
276 #else
277 if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
278 png_error(png_ptr, "image size exceeds user limits in IHDR");
279 #endif
280 if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
281 png_error(png_ptr, "Invalid image size in IHDR");
282 if ( width > (PNG_UINT_32_MAX
283 >> 3) /* 8-byte RGBA pixels */
284 - 64 /* bigrowbuf hack */
285 - 1 /* filter byte */
286 - 7*8 /* rounding of width to multiple of 8 pixels */
287 - 8) /* extra max_pixel_depth pad */
288 png_warning(png_ptr, "Width is too large for libpng to process pixels");
290 /* check other values */
291 if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
292 bit_depth != 8 && bit_depth != 16)
293 png_error(png_ptr, "Invalid bit depth in IHDR");
295 if (color_type < 0 || color_type == 1 ||
296 color_type == 5 || color_type > 6)
297 png_error(png_ptr, "Invalid color type in IHDR");
299 if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
300 ((color_type == PNG_COLOR_TYPE_RGB ||
301 color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
302 color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
303 png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
305 if (interlace_type >= PNG_INTERLACE_LAST)
306 png_error(png_ptr, "Unknown interlace method in IHDR");
308 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
309 png_error(png_ptr, "Unknown compression method in IHDR");
311 #if defined(PNG_MNG_FEATURES_SUPPORTED)
312 /* Accept filter_method 64 (intrapixel differencing) only if
313 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
314 * 2. Libpng did not read a PNG signature (this filter_method is only
315 * used in PNG datastreams that are embedded in MNG datastreams) and
316 * 3. The application called png_permit_mng_features with a mask that
317 * included PNG_FLAG_MNG_FILTER_64 and
318 * 4. The filter_method is 64 and
319 * 5. The color_type is RGB or RGBA
320 */
321 if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
322 png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
323 if (filter_type != PNG_FILTER_TYPE_BASE)
324 {
325 if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
326 (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
327 ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
328 (color_type == PNG_COLOR_TYPE_RGB ||
329 color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
330 png_error(png_ptr, "Unknown filter method in IHDR");
331 if (png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
332 png_warning(png_ptr, "Invalid filter method in IHDR");
333 }
334 #else
335 if (filter_type != PNG_FILTER_TYPE_BASE)
336 png_error(png_ptr, "Unknown filter method in IHDR");
337 #endif
339 info_ptr->width = width;
340 info_ptr->height = height;
341 info_ptr->bit_depth = (png_byte)bit_depth;
342 info_ptr->color_type =(png_byte) color_type;
343 info_ptr->compression_type = (png_byte)compression_type;
344 info_ptr->filter_type = (png_byte)filter_type;
345 info_ptr->interlace_type = (png_byte)interlace_type;
346 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
347 info_ptr->channels = 1;
348 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
349 info_ptr->channels = 3;
350 else
351 info_ptr->channels = 1;
352 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
353 info_ptr->channels++;
354 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
356 /* check for potential overflow */
357 if (width > (PNG_UINT_32_MAX
358 >> 3) /* 8-byte RGBA pixels */
359 - 64 /* bigrowbuf hack */
360 - 1 /* filter byte */
361 - 7*8 /* rounding of width to multiple of 8 pixels */
362 - 8) /* extra max_pixel_depth pad */
363 info_ptr->rowbytes = (png_size_t)0;
364 else
365 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
366 }
368 #if defined(PNG_oFFs_SUPPORTED)
369 void PNGAPI
370 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
371 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
372 {
373 png_debug1(1, "in %s storage function\n", "oFFs");
374 if (png_ptr == NULL || info_ptr == NULL)
375 return;
377 info_ptr->x_offset = offset_x;
378 info_ptr->y_offset = offset_y;
379 info_ptr->offset_unit_type = (png_byte)unit_type;
380 info_ptr->valid |= PNG_INFO_oFFs;
381 }
382 #endif
384 #if defined(PNG_pCAL_SUPPORTED)
385 void PNGAPI
386 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
387 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
388 png_charp units, png_charpp params)
389 {
390 png_uint_32 length;
391 int i;
393 png_debug1(1, "in %s storage function\n", "pCAL");
394 if (png_ptr == NULL || info_ptr == NULL)
395 return;
397 length = png_strlen(purpose) + 1;
398 png_debug1(3, "allocating purpose for info (%lu bytes)\n",
399 (unsigned long)length);
400 info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
401 if (info_ptr->pcal_purpose == NULL)
402 {
403 png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
404 return;
405 }
406 png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
408 png_debug(3, "storing X0, X1, type, and nparams in info\n");
409 info_ptr->pcal_X0 = X0;
410 info_ptr->pcal_X1 = X1;
411 info_ptr->pcal_type = (png_byte)type;
412 info_ptr->pcal_nparams = (png_byte)nparams;
414 length = png_strlen(units) + 1;
415 png_debug1(3, "allocating units for info (%lu bytes)\n",
416 (unsigned long)length);
417 info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
418 if (info_ptr->pcal_units == NULL)
419 {
420 png_warning(png_ptr, "Insufficient memory for pCAL units.");
421 return;
422 }
423 png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
425 info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
426 (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
427 if (info_ptr->pcal_params == NULL)
428 {
429 png_warning(png_ptr, "Insufficient memory for pCAL params.");
430 return;
431 }
433 info_ptr->pcal_params[nparams] = NULL;
435 for (i = 0; i < nparams; i++)
436 {
437 length = png_strlen(params[i]) + 1;
438 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i,
439 (unsigned long)length);
440 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
441 if (info_ptr->pcal_params[i] == NULL)
442 {
443 png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
444 return;
445 }
446 png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
447 }
449 info_ptr->valid |= PNG_INFO_pCAL;
450 #ifdef PNG_FREE_ME_SUPPORTED
451 info_ptr->free_me |= PNG_FREE_PCAL;
452 #endif
453 }
454 #endif
456 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
457 #ifdef PNG_FLOATING_POINT_SUPPORTED
458 void PNGAPI
459 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
460 int unit, double width, double height)
461 {
462 png_debug1(1, "in %s storage function\n", "sCAL");
463 if (png_ptr == NULL || info_ptr == NULL)
464 return;
466 info_ptr->scal_unit = (png_byte)unit;
467 info_ptr->scal_pixel_width = width;
468 info_ptr->scal_pixel_height = height;
470 info_ptr->valid |= PNG_INFO_sCAL;
471 }
472 #else
473 #ifdef PNG_FIXED_POINT_SUPPORTED
474 void PNGAPI
475 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
476 int unit, png_charp swidth, png_charp sheight)
477 {
478 png_uint_32 length;
480 png_debug1(1, "in %s storage function\n", "sCAL");
481 if (png_ptr == NULL || info_ptr == NULL)
482 return;
484 info_ptr->scal_unit = (png_byte)unit;
486 length = png_strlen(swidth) + 1;
487 png_debug1(3, "allocating unit for info (%u bytes)\n",
488 (unsigned int)length);
489 info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
490 if (info_ptr->scal_s_width == NULL)
491 {
492 png_warning(png_ptr,
493 "Memory allocation failed while processing sCAL.");
494 return;
495 }
496 png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
498 length = png_strlen(sheight) + 1;
499 png_debug1(3, "allocating unit for info (%u bytes)\n",
500 (unsigned int)length);
501 info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
502 if (info_ptr->scal_s_height == NULL)
503 {
504 png_free (png_ptr, info_ptr->scal_s_width);
505 info_ptr->scal_s_width = NULL;
506 png_warning(png_ptr,
507 "Memory allocation failed while processing sCAL.");
508 return;
509 }
510 png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
511 info_ptr->valid |= PNG_INFO_sCAL;
512 #ifdef PNG_FREE_ME_SUPPORTED
513 info_ptr->free_me |= PNG_FREE_SCAL;
514 #endif
515 }
516 #endif
517 #endif
518 #endif
520 #if defined(PNG_pHYs_SUPPORTED)
521 void PNGAPI
522 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
523 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
524 {
525 png_debug1(1, "in %s storage function\n", "pHYs");
526 if (png_ptr == NULL || info_ptr == NULL)
527 return;
529 info_ptr->x_pixels_per_unit = res_x;
530 info_ptr->y_pixels_per_unit = res_y;
531 info_ptr->phys_unit_type = (png_byte)unit_type;
532 info_ptr->valid |= PNG_INFO_pHYs;
533 }
534 #endif
536 void PNGAPI
537 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
538 png_colorp palette, int num_palette)
539 {
541 png_debug1(1, "in %s storage function\n", "PLTE");
542 if (png_ptr == NULL || info_ptr == NULL)
543 return;
545 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
546 {
547 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
548 png_error(png_ptr, "Invalid palette length");
549 else
550 {
551 png_warning(png_ptr, "Invalid palette length");
552 return;
553 }
554 }
556 /*
557 * It may not actually be necessary to set png_ptr->palette here;
558 * we do it for backward compatibility with the way the png_handle_tRNS
559 * function used to do the allocation.
560 */
561 #ifdef PNG_FREE_ME_SUPPORTED
562 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
563 #endif
565 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
566 of num_palette entries,
567 in case of an invalid PNG file that has too-large sample values. */
568 png_ptr->palette = (png_colorp)png_malloc(png_ptr,
569 PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
570 png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
571 png_sizeof(png_color));
572 png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
573 info_ptr->palette = png_ptr->palette;
574 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
576 #ifdef PNG_FREE_ME_SUPPORTED
577 info_ptr->free_me |= PNG_FREE_PLTE;
578 #else
579 png_ptr->flags |= PNG_FLAG_FREE_PLTE;
580 #endif
582 info_ptr->valid |= PNG_INFO_PLTE;
583 }
585 #if defined(PNG_sBIT_SUPPORTED)
586 void PNGAPI
587 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
588 png_color_8p sig_bit)
589 {
590 png_debug1(1, "in %s storage function\n", "sBIT");
591 if (png_ptr == NULL || info_ptr == NULL)
592 return;
594 png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
595 info_ptr->valid |= PNG_INFO_sBIT;
596 }
597 #endif
599 #if defined(PNG_sRGB_SUPPORTED)
600 void PNGAPI
601 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
602 {
603 png_debug1(1, "in %s storage function\n", "sRGB");
604 if (png_ptr == NULL || info_ptr == NULL)
605 return;
607 info_ptr->srgb_intent = (png_byte)intent;
608 info_ptr->valid |= PNG_INFO_sRGB;
609 }
611 void PNGAPI
612 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
613 int intent)
614 {
615 #if defined(PNG_gAMA_SUPPORTED)
616 #ifdef PNG_FLOATING_POINT_SUPPORTED
617 float file_gamma;
618 #endif
619 #ifdef PNG_FIXED_POINT_SUPPORTED
620 png_fixed_point int_file_gamma;
621 #endif
622 #endif
623 #if defined(PNG_cHRM_SUPPORTED)
624 #ifdef PNG_FLOATING_POINT_SUPPORTED
625 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
626 #endif
627 #ifdef PNG_FIXED_POINT_SUPPORTED
628 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
629 int_green_y, int_blue_x, int_blue_y;
630 #endif
631 #endif
632 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
633 if (png_ptr == NULL || info_ptr == NULL)
634 return;
636 png_set_sRGB(png_ptr, info_ptr, intent);
638 #if defined(PNG_gAMA_SUPPORTED)
639 #ifdef PNG_FLOATING_POINT_SUPPORTED
640 file_gamma = (float).45455;
641 png_set_gAMA(png_ptr, info_ptr, file_gamma);
642 #endif
643 #ifdef PNG_FIXED_POINT_SUPPORTED
644 int_file_gamma = 45455L;
645 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
646 #endif
647 #endif
649 #if defined(PNG_cHRM_SUPPORTED)
650 #ifdef PNG_FIXED_POINT_SUPPORTED
651 int_white_x = 31270L;
652 int_white_y = 32900L;
653 int_red_x = 64000L;
654 int_red_y = 33000L;
655 int_green_x = 30000L;
656 int_green_y = 60000L;
657 int_blue_x = 15000L;
658 int_blue_y = 6000L;
660 png_set_cHRM_fixed(png_ptr, info_ptr,
661 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
662 int_blue_x, int_blue_y);
663 #endif
664 #ifdef PNG_FLOATING_POINT_SUPPORTED
665 white_x = (float).3127;
666 white_y = (float).3290;
667 red_x = (float).64;
668 red_y = (float).33;
669 green_x = (float).30;
670 green_y = (float).60;
671 blue_x = (float).15;
672 blue_y = (float).06;
674 png_set_cHRM(png_ptr, info_ptr,
675 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
676 #endif
677 #endif
678 }
679 #endif
682 #if defined(PNG_iCCP_SUPPORTED)
683 void PNGAPI
684 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
685 png_charp name, int compression_type,
686 png_charp profile, png_uint_32 proflen)
687 {
688 png_charp new_iccp_name;
689 png_charp new_iccp_profile;
690 png_uint_32 length;
692 png_debug1(1, "in %s storage function\n", "iCCP");
693 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
694 return;
696 length = png_strlen(name)+1;
697 new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
698 if (new_iccp_name == NULL)
699 {
700 png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
701 return;
702 }
703 png_memcpy(new_iccp_name, name, length);
704 new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
705 if (new_iccp_profile == NULL)
706 {
707 png_free (png_ptr, new_iccp_name);
708 png_warning(png_ptr,
709 "Insufficient memory to process iCCP profile.");
710 return;
711 }
712 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
714 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
716 info_ptr->iccp_proflen = proflen;
717 info_ptr->iccp_name = new_iccp_name;
718 info_ptr->iccp_profile = new_iccp_profile;
719 /* Compression is always zero but is here so the API and info structure
720 * does not have to change if we introduce multiple compression types */
721 info_ptr->iccp_compression = (png_byte)compression_type;
722 #ifdef PNG_FREE_ME_SUPPORTED
723 info_ptr->free_me |= PNG_FREE_ICCP;
724 #endif
725 info_ptr->valid |= PNG_INFO_iCCP;
726 }
727 #endif
729 #if defined(PNG_TEXT_SUPPORTED)
730 void PNGAPI
731 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
732 int num_text)
733 {
734 int ret;
735 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
736 if (ret)
737 png_error(png_ptr, "Insufficient memory to store text");
738 }
740 int /* PRIVATE */
741 png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
742 int num_text)
743 {
744 int i;
746 png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
747 "text" : (png_const_charp)png_ptr->chunk_name));
749 if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
750 return(0);
752 /* Make sure we have enough space in the "text" array in info_struct
753 * to hold all of the incoming text_ptr objects.
754 */
755 if (info_ptr->num_text + num_text > info_ptr->max_text)
756 {
757 if (info_ptr->text != NULL)
758 {
759 png_textp old_text;
760 int old_max;
762 old_max = info_ptr->max_text;
763 info_ptr->max_text = info_ptr->num_text + num_text + 8;
764 old_text = info_ptr->text;
765 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
766 (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
767 if (info_ptr->text == NULL)
768 {
769 png_free(png_ptr, old_text);
770 return(1);
771 }
772 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
773 png_sizeof(png_text)));
774 png_free(png_ptr, old_text);
775 }
776 else
777 {
778 info_ptr->max_text = num_text + 8;
779 info_ptr->num_text = 0;
780 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
781 (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
782 if (info_ptr->text == NULL)
783 return(1);
784 #ifdef PNG_FREE_ME_SUPPORTED
785 info_ptr->free_me |= PNG_FREE_TEXT;
786 #endif
787 }
788 png_debug1(3, "allocated %d entries for info_ptr->text\n",
789 info_ptr->max_text);
790 }
791 for (i = 0; i < num_text; i++)
792 {
793 png_size_t text_length, key_len;
794 png_size_t lang_len, lang_key_len;
795 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
797 if (text_ptr[i].key == NULL)
798 continue;
800 key_len = png_strlen(text_ptr[i].key);
802 if (text_ptr[i].compression <= 0)
803 {
804 lang_len = 0;
805 lang_key_len = 0;
806 }
807 else
808 #ifdef PNG_iTXt_SUPPORTED
809 {
810 /* set iTXt data */
811 if (text_ptr[i].lang != NULL)
812 lang_len = png_strlen(text_ptr[i].lang);
813 else
814 lang_len = 0;
815 if (text_ptr[i].lang_key != NULL)
816 lang_key_len = png_strlen(text_ptr[i].lang_key);
817 else
818 lang_key_len = 0;
819 }
820 #else
821 {
822 png_warning(png_ptr, "iTXt chunk not supported.");
823 continue;
824 }
825 #endif
827 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
828 {
829 text_length = 0;
830 #ifdef PNG_iTXt_SUPPORTED
831 if (text_ptr[i].compression > 0)
832 textp->compression = PNG_ITXT_COMPRESSION_NONE;
833 else
834 #endif
835 textp->compression = PNG_TEXT_COMPRESSION_NONE;
836 }
837 else
838 {
839 text_length = png_strlen(text_ptr[i].text);
840 textp->compression = text_ptr[i].compression;
841 }
843 textp->key = (png_charp)png_malloc_warn(png_ptr,
844 (png_uint_32)
845 (key_len + text_length + lang_len + lang_key_len + 4));
846 if (textp->key == NULL)
847 return(1);
848 png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
849 (png_uint_32)
850 (key_len + lang_len + lang_key_len + text_length + 4),
851 (int)textp->key);
853 png_memcpy(textp->key, text_ptr[i].key,
854 (png_size_t)(key_len));
855 *(textp->key + key_len) = '\0';
856 #ifdef PNG_iTXt_SUPPORTED
857 if (text_ptr[i].compression > 0)
858 {
859 textp->lang = textp->key + key_len + 1;
860 png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
861 *(textp->lang + lang_len) = '\0';
862 textp->lang_key = textp->lang + lang_len + 1;
863 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
864 *(textp->lang_key + lang_key_len) = '\0';
865 textp->text = textp->lang_key + lang_key_len + 1;
866 }
867 else
868 #endif
869 {
870 #ifdef PNG_iTXt_SUPPORTED
871 textp->lang=NULL;
872 textp->lang_key=NULL;
873 #endif
874 textp->text = textp->key + key_len + 1;
875 }
876 if (text_length)
877 png_memcpy(textp->text, text_ptr[i].text,
878 (png_size_t)(text_length));
879 *(textp->text + text_length) = '\0';
881 #ifdef PNG_iTXt_SUPPORTED
882 if (textp->compression > 0)
883 {
884 textp->text_length = 0;
885 textp->itxt_length = text_length;
886 }
887 else
888 #endif
889 {
890 textp->text_length = text_length;
891 #ifdef PNG_iTXt_SUPPORTED
892 textp->itxt_length = 0;
893 #endif
894 }
895 info_ptr->num_text++;
896 png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
897 }
898 return(0);
899 }
900 #endif
902 #if defined(PNG_tIME_SUPPORTED)
903 void PNGAPI
904 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
905 {
906 png_debug1(1, "in %s storage function\n", "tIME");
907 if (png_ptr == NULL || info_ptr == NULL ||
908 (png_ptr->mode & PNG_WROTE_tIME))
909 return;
911 png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
912 info_ptr->valid |= PNG_INFO_tIME;
913 }
914 #endif
916 #if defined(PNG_tRNS_SUPPORTED)
917 void PNGAPI
918 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
919 png_bytep trans, int num_trans, png_color_16p trans_values)
920 {
921 png_debug1(1, "in %s storage function\n", "tRNS");
922 if (png_ptr == NULL || info_ptr == NULL)
923 return;
925 if (trans != NULL)
926 {
927 /*
928 * It may not actually be necessary to set png_ptr->trans here;
929 * we do it for backward compatibility with the way the png_handle_tRNS
930 * function used to do the allocation.
931 */
933 #ifdef PNG_FREE_ME_SUPPORTED
934 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
935 #endif
937 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
938 png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
939 (png_uint_32)PNG_MAX_PALETTE_LENGTH);
940 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
941 png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
942 }
944 if (trans_values != NULL)
945 {
946 int sample_max = (1 << info_ptr->bit_depth);
947 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
948 (int)trans_values->gray > sample_max) ||
949 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
950 ((int)trans_values->red > sample_max ||
951 (int)trans_values->green > sample_max ||
952 (int)trans_values->blue > sample_max)))
953 png_warning(png_ptr,
954 "tRNS chunk has out-of-range samples for bit_depth");
955 png_memcpy(&(info_ptr->trans_values), trans_values,
956 png_sizeof(png_color_16));
957 if (num_trans == 0)
958 num_trans = 1;
959 }
961 info_ptr->num_trans = (png_uint_16)num_trans;
962 if (num_trans != 0)
963 {
964 info_ptr->valid |= PNG_INFO_tRNS;
965 #ifdef PNG_FREE_ME_SUPPORTED
966 info_ptr->free_me |= PNG_FREE_TRNS;
967 #else
968 png_ptr->flags |= PNG_FLAG_FREE_TRNS;
969 #endif
970 }
971 }
972 #endif
974 #if defined(PNG_sPLT_SUPPORTED)
975 void PNGAPI
976 png_set_sPLT(png_structp png_ptr,
977 png_infop info_ptr, png_sPLT_tp entries, int nentries)
978 /*
979 * entries - array of png_sPLT_t structures
980 * to be added to the list of palettes
981 * in the info structure.
982 * nentries - number of palette structures to be
983 * added.
984 */
985 {
986 png_sPLT_tp np;
987 int i;
989 if (png_ptr == NULL || info_ptr == NULL)
990 return;
992 np = (png_sPLT_tp)png_malloc_warn(png_ptr,
993 (info_ptr->splt_palettes_num + nentries) *
994 (png_uint_32)png_sizeof(png_sPLT_t));
995 if (np == NULL)
996 {
997 png_warning(png_ptr, "No memory for sPLT palettes.");
998 return;
999 }
1001 png_memcpy(np, info_ptr->splt_palettes,
1002 info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
1003 png_free(png_ptr, info_ptr->splt_palettes);
1004 info_ptr->splt_palettes=NULL;
1006 for (i = 0; i < nentries; i++)
1007 {
1008 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
1009 png_sPLT_tp from = entries + i;
1010 png_uint_32 length;
1012 length = png_strlen(from->name) + 1;
1013 to->name = (png_charp)png_malloc_warn(png_ptr, length);
1014 if (to->name == NULL)
1015 {
1016 png_warning(png_ptr,
1017 "Out of memory while processing sPLT chunk");
1018 continue;
1019 }
1020 png_memcpy(to->name, from->name, length);
1021 to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
1022 (png_uint_32)(from->nentries * png_sizeof(png_sPLT_entry)));
1023 if (to->entries == NULL)
1024 {
1025 png_warning(png_ptr,
1026 "Out of memory while processing sPLT chunk");
1027 png_free(png_ptr, to->name);
1028 to->name = NULL;
1029 continue;
1030 }
1031 png_memcpy(to->entries, from->entries,
1032 from->nentries * png_sizeof(png_sPLT_entry));
1033 to->nentries = from->nentries;
1034 to->depth = from->depth;
1035 }
1037 info_ptr->splt_palettes = np;
1038 info_ptr->splt_palettes_num += nentries;
1039 info_ptr->valid |= PNG_INFO_sPLT;
1040 #ifdef PNG_FREE_ME_SUPPORTED
1041 info_ptr->free_me |= PNG_FREE_SPLT;
1042 #endif
1043 }
1044 #endif /* PNG_sPLT_SUPPORTED */
1046 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1047 void PNGAPI
1048 png_set_unknown_chunks(png_structp png_ptr,
1049 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
1050 {
1051 png_unknown_chunkp np;
1052 int i;
1054 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
1055 return;
1057 np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
1058 (png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *
1059 png_sizeof(png_unknown_chunk)));
1060 if (np == NULL)
1061 {
1062 png_warning(png_ptr,
1063 "Out of memory while processing unknown chunk.");
1064 return;
1065 }
1067 png_memcpy(np, info_ptr->unknown_chunks,
1068 info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
1069 png_free(png_ptr, info_ptr->unknown_chunks);
1070 info_ptr->unknown_chunks=NULL;
1072 for (i = 0; i < num_unknowns; i++)
1073 {
1074 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
1075 png_unknown_chunkp from = unknowns + i;
1077 png_memcpy((png_charp)to->name,
1078 (png_charp)from->name,
1079 png_sizeof(from->name));
1080 to->name[png_sizeof(to->name)-1] = '\0';
1081 to->size = from->size;
1082 /* note our location in the read or write sequence */
1083 to->location = (png_byte)(png_ptr->mode & 0xff);
1085 if (from->size == 0)
1086 to->data=NULL;
1087 else
1088 {
1089 to->data = (png_bytep)png_malloc_warn(png_ptr,
1090 (png_uint_32)from->size);
1091 if (to->data == NULL)
1092 {
1093 png_warning(png_ptr,
1094 "Out of memory while processing unknown chunk.");
1095 to->size = 0;
1096 }
1097 else
1098 png_memcpy(to->data, from->data, from->size);
1099 }
1100 }
1102 info_ptr->unknown_chunks = np;
1103 info_ptr->unknown_chunks_num += num_unknowns;
1104 #ifdef PNG_FREE_ME_SUPPORTED
1105 info_ptr->free_me |= PNG_FREE_UNKN;
1106 #endif
1107 }
1108 void PNGAPI
1109 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
1110 int chunk, int location)
1111 {
1112 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
1113 (int)info_ptr->unknown_chunks_num)
1114 info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1115 }
1116 #endif
1118 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
1119 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1120 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1121 void PNGAPI
1122 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
1123 {
1124 /* This function is deprecated in favor of png_permit_mng_features()
1125 and will be removed from libpng-1.3.0 */
1126 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
1127 if (png_ptr == NULL)
1128 return;
1129 png_ptr->mng_features_permitted = (png_byte)
1130 ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) |
1131 ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
1132 }
1133 #endif
1134 #endif
1136 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1137 png_uint_32 PNGAPI
1138 png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1139 {
1140 png_debug(1, "in png_permit_mng_features\n");
1141 if (png_ptr == NULL)
1142 return (png_uint_32)0;
1143 png_ptr->mng_features_permitted =
1144 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1145 return (png_uint_32)png_ptr->mng_features_permitted;
1146 }
1147 #endif
1149 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1150 void PNGAPI
1151 png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1152 chunk_list, int num_chunks)
1153 {
1154 png_bytep new_list, p;
1155 int i, old_num_chunks;
1156 if (png_ptr == NULL)
1157 return;
1158 if (num_chunks == 0)
1159 {
1160 if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
1161 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1162 else
1163 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1165 if (keep == PNG_HANDLE_CHUNK_ALWAYS)
1166 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1167 else
1168 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1169 return;
1170 }
1171 if (chunk_list == NULL)
1172 return;
1173 old_num_chunks = png_ptr->num_chunk_list;
1174 new_list=(png_bytep)png_malloc(png_ptr,
1175 (png_uint_32)
1176 (5*(num_chunks + old_num_chunks)));
1177 if (png_ptr->chunk_list != NULL)
1178 {
1179 png_memcpy(new_list, png_ptr->chunk_list,
1180 (png_size_t)(5*old_num_chunks));
1181 png_free(png_ptr, png_ptr->chunk_list);
1182 png_ptr->chunk_list=NULL;
1183 }
1184 png_memcpy(new_list + 5*old_num_chunks, chunk_list,
1185 (png_size_t)(5*num_chunks));
1186 for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
1187 *p=(png_byte)keep;
1188 png_ptr->num_chunk_list = old_num_chunks + num_chunks;
1189 png_ptr->chunk_list = new_list;
1190 #ifdef PNG_FREE_ME_SUPPORTED
1191 png_ptr->free_me |= PNG_FREE_LIST;
1192 #endif
1193 }
1194 #endif
1196 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1197 void PNGAPI
1198 png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1199 png_user_chunk_ptr read_user_chunk_fn)
1200 {
1201 png_debug(1, "in png_set_read_user_chunk_fn\n");
1202 if (png_ptr == NULL)
1203 return;
1204 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1205 png_ptr->user_chunk_ptr = user_chunk_ptr;
1206 }
1207 #endif
1209 #if defined(PNG_INFO_IMAGE_SUPPORTED)
1210 void PNGAPI
1211 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1212 {
1213 png_debug1(1, "in %s storage function\n", "rows");
1215 if (png_ptr == NULL || info_ptr == NULL)
1216 return;
1218 if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1219 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1220 info_ptr->row_pointers = row_pointers;
1221 if (row_pointers)
1222 info_ptr->valid |= PNG_INFO_IDAT;
1223 }
1224 #endif
1226 #ifdef PNG_WRITE_SUPPORTED
1227 void PNGAPI
1228 png_set_compression_buffer_size(png_structp png_ptr,
1229 png_uint_32 size)
1230 {
1231 if (png_ptr == NULL)
1232 return;
1233 png_free(png_ptr, png_ptr->zbuf);
1234 png_ptr->zbuf_size = (png_size_t)size;
1235 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1236 png_ptr->zstream.next_out = png_ptr->zbuf;
1237 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1238 }
1239 #endif
1241 void PNGAPI
1242 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1243 {
1244 if (png_ptr && info_ptr)
1245 info_ptr->valid &= ~mask;
1246 }
1249 #ifndef PNG_1_0_X
1250 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1251 /* function was added to libpng 1.2.0 and should always exist by default */
1252 void PNGAPI
1253 png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1254 {
1255 /* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1256 if (png_ptr != NULL)
1257 png_ptr->asm_flags = 0;
1258 asm_flags = asm_flags; /* Quiet the compiler */
1259 }
1261 /* this function was added to libpng 1.2.0 */
1262 void PNGAPI
1263 png_set_mmx_thresholds (png_structp png_ptr,
1264 png_byte mmx_bitdepth_threshold,
1265 png_uint_32 mmx_rowbytes_threshold)
1266 {
1267 /* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1268 if (png_ptr == NULL)
1269 return;
1270 /* Quiet the compiler */
1271 mmx_bitdepth_threshold = mmx_bitdepth_threshold;
1272 mmx_rowbytes_threshold = mmx_rowbytes_threshold;
1273 }
1274 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1276 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1277 /* this function was added to libpng 1.2.6 */
1278 void PNGAPI
1279 png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
1280 png_uint_32 user_height_max)
1281 {
1282 /* Images with dimensions larger than these limits will be
1283 * rejected by png_set_IHDR(). To accept any PNG datastream
1284 * regardless of dimensions, set both limits to 0x7ffffffL.
1285 */
1286 if (png_ptr == NULL) return;
1287 png_ptr->user_width_max = user_width_max;
1288 png_ptr->user_height_max = user_height_max;
1289 }
1290 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1292 #endif /* ?PNG_1_0_X */
1293 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */