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1
2/* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.2.17 May 15, 2007
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2007 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 */
15
16#define PNG_INTERNAL
17#include "png.h"
18
19#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
20
21#if defined(PNG_bKGD_SUPPORTED)
22void PNGAPI
23png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
24{
25 png_debug1(1, "in %s storage function\n", "bKGD");
26 if (png_ptr == NULL || info_ptr == NULL)
27 return;
28
29 png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
30 info_ptr->valid |= PNG_INFO_bKGD;
31}
32#endif
33
34#if defined(PNG_cHRM_SUPPORTED)
35#ifdef PNG_FLOATING_POINT_SUPPORTED
36void PNGAPI
37png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
38 double white_x, double white_y, double red_x, double red_y,
39 double green_x, double green_y, double blue_x, double blue_y)
40{
41 png_debug1(1, "in %s storage function\n", "cHRM");
42 if (png_ptr == NULL || info_ptr == NULL)
43 return;
44
45 if (white_x < 0.0 || white_y < 0.0 ||
46 red_x < 0.0 || red_y < 0.0 ||
47 green_x < 0.0 || green_y < 0.0 ||
48 blue_x < 0.0 || blue_y < 0.0)
49 {
50 png_warning(png_ptr,
51 "Ignoring attempt to set negative chromaticity value");
52 return;
53 }
54 if (white_x > 21474.83 || white_y > 21474.83 ||
55 red_x > 21474.83 || red_y > 21474.83 ||
56 green_x > 21474.83 || green_y > 21474.83 ||
57 blue_x > 21474.83 || blue_y > 21474.83)
58 {
59 png_warning(png_ptr,
60 "Ignoring attempt to set chromaticity value exceeding 21474.83");
61 return;
62 }
63
64 info_ptr->x_white = (float)white_x;
65 info_ptr->y_white = (float)white_y;
66 info_ptr->x_red = (float)red_x;
67 info_ptr->y_red = (float)red_y;
68 info_ptr->x_green = (float)green_x;
69 info_ptr->y_green = (float)green_y;
70 info_ptr->x_blue = (float)blue_x;
71 info_ptr->y_blue = (float)blue_y;
72#ifdef PNG_FIXED_POINT_SUPPORTED
73 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
74 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
75 info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5);
76 info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5);
77 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
78 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
79 info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5);
80 info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5);
81#endif
82 info_ptr->valid |= PNG_INFO_cHRM;
83}
84#endif
85#ifdef PNG_FIXED_POINT_SUPPORTED
86void PNGAPI
87png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
88 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
89 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
90 png_fixed_point blue_x, png_fixed_point blue_y)
91{
92 png_debug1(1, "in %s storage function\n", "cHRM");
93 if (png_ptr == NULL || info_ptr == NULL)
94 return;
95
96 if (white_x < 0 || white_y < 0 ||
97 red_x < 0 || red_y < 0 ||
98 green_x < 0 || green_y < 0 ||
99 blue_x < 0 || blue_y < 0)
100 {
101 png_warning(png_ptr,
102 "Ignoring attempt to set negative chromaticity value");
103 return;
104 }
105#ifdef PNG_FLOATING_POINT_SUPPORTED
106 if (white_x > (double) PNG_UINT_31_MAX ||
107 white_y > (double) PNG_UINT_31_MAX ||
108 red_x > (double) PNG_UINT_31_MAX ||
109 red_y > (double) PNG_UINT_31_MAX ||
110 green_x > (double) PNG_UINT_31_MAX ||
111 green_y > (double) PNG_UINT_31_MAX ||
112 blue_x > (double) PNG_UINT_31_MAX ||
113 blue_y > (double) PNG_UINT_31_MAX)
114#else
115 if (white_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
116 white_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
117 red_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
118 red_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
119 green_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
120 green_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
121 blue_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
122 blue_y > (png_fixed_point) PNG_UINT_31_MAX/100000L)
123#endif
124 {
125 png_warning(png_ptr,
126 "Ignoring attempt to set chromaticity value exceeding 21474.83");
127 return;
128 }
129 info_ptr->int_x_white = white_x;
130 info_ptr->int_y_white = white_y;
131 info_ptr->int_x_red = red_x;
132 info_ptr->int_y_red = red_y;
133 info_ptr->int_x_green = green_x;
134 info_ptr->int_y_green = green_y;
135 info_ptr->int_x_blue = blue_x;
136 info_ptr->int_y_blue = blue_y;
137#ifdef PNG_FLOATING_POINT_SUPPORTED
138 info_ptr->x_white = (float)(white_x/100000.);
139 info_ptr->y_white = (float)(white_y/100000.);
140 info_ptr->x_red = (float)( red_x/100000.);
141 info_ptr->y_red = (float)( red_y/100000.);
142 info_ptr->x_green = (float)(green_x/100000.);
143 info_ptr->y_green = (float)(green_y/100000.);
144 info_ptr->x_blue = (float)( blue_x/100000.);
145 info_ptr->y_blue = (float)( blue_y/100000.);
146#endif
147 info_ptr->valid |= PNG_INFO_cHRM;
148}
149#endif
150#endif
151
152#if defined(PNG_gAMA_SUPPORTED)
153#ifdef PNG_FLOATING_POINT_SUPPORTED
154void PNGAPI
155png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
156{
157 double gamma;
158 png_debug1(1, "in %s storage function\n", "gAMA");
159 if (png_ptr == NULL || info_ptr == NULL)
160 return;
161
162 /* Check for overflow */
163 if (file_gamma > 21474.83)
164 {
165 png_warning(png_ptr, "Limiting gamma to 21474.83");
166 gamma=21474.83;
167 }
168 else
169 gamma=file_gamma;
170 info_ptr->gamma = (float)gamma;
171#ifdef PNG_FIXED_POINT_SUPPORTED
172 info_ptr->int_gamma = (int)(gamma*100000.+.5);
173#endif
174 info_ptr->valid |= PNG_INFO_gAMA;
175 if(gamma == 0.0)
176 png_warning(png_ptr, "Setting gamma=0");
177}
178#endif
179void PNGAPI
180png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
181 int_gamma)
182{
183 png_fixed_point gamma;
184
185 png_debug1(1, "in %s storage function\n", "gAMA");
186 if (png_ptr == NULL || info_ptr == NULL)
187 return;
188
189 if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
190 {
191 png_warning(png_ptr, "Limiting gamma to 21474.83");
192 gamma=PNG_UINT_31_MAX;
193 }
194 else
195 {
196 if (int_gamma < 0)
197 {
198 png_warning(png_ptr, "Setting negative gamma to zero");
199 gamma=0;
200 }
201 else
202 gamma=int_gamma;
203 }
204#ifdef PNG_FLOATING_POINT_SUPPORTED
205 info_ptr->gamma = (float)(gamma/100000.);
206#endif
207#ifdef PNG_FIXED_POINT_SUPPORTED
208 info_ptr->int_gamma = gamma;
209#endif
210 info_ptr->valid |= PNG_INFO_gAMA;
211 if(gamma == 0)
212 png_warning(png_ptr, "Setting gamma=0");
213}
214#endif
215
216#if defined(PNG_hIST_SUPPORTED)
217void PNGAPI
218png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
219{
220 int i;
221
222 png_debug1(1, "in %s storage function\n", "hIST");
223 if (png_ptr == NULL || info_ptr == NULL)
224 return;
225 if (info_ptr->num_palette <= 0 || info_ptr->num_palette
226 > PNG_MAX_PALETTE_LENGTH)
227 {
228 png_warning(png_ptr,
229 "Invalid palette size, hIST allocation skipped.");
230 return;
231 }
232
233#ifdef PNG_FREE_ME_SUPPORTED
234 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
235#endif
236 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
237 1.2.1 */
238 png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
239 (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof (png_uint_16)));
240 if (png_ptr->hist == NULL)
241 {
242 png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
243 return;
244 }
245
246 for (i = 0; i < info_ptr->num_palette; i++)
247 png_ptr->hist[i] = hist[i];
248 info_ptr->hist = png_ptr->hist;
249 info_ptr->valid |= PNG_INFO_hIST;
250
251#ifdef PNG_FREE_ME_SUPPORTED
252 info_ptr->free_me |= PNG_FREE_HIST;
253#else
254 png_ptr->flags |= PNG_FLAG_FREE_HIST;
255#endif
256}
257#endif
258
259void PNGAPI
260png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
261 png_uint_32 width, png_uint_32 height, int bit_depth,
262 int color_type, int interlace_type, int compression_type,
263 int filter_type)
264{
265 png_debug1(1, "in %s storage function\n", "IHDR");
266 if (png_ptr == NULL || info_ptr == NULL)
267 return;
268
269 /* check for width and height valid values */
270 if (width == 0 || height == 0)
271 png_error(png_ptr, "Image width or height is zero in IHDR");
272#ifdef PNG_SET_USER_LIMITS_SUPPORTED
273 if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
274 png_error(png_ptr, "image size exceeds user limits in IHDR");
275#else
276 if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
277 png_error(png_ptr, "image size exceeds user limits in IHDR");
278#endif
279 if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
280 png_error(png_ptr, "Invalid image size in IHDR");
281 if ( width > (PNG_UINT_32_MAX
282 >> 3) /* 8-byte RGBA pixels */
283 - 64 /* bigrowbuf hack */
284 - 1 /* filter byte */
285 - 7*8 /* rounding of width to multiple of 8 pixels */
286 - 8) /* extra max_pixel_depth pad */
287 png_warning(png_ptr, "Width is too large for libpng to process pixels");
288
289 /* check other values */
290 if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
291 bit_depth != 8 && bit_depth != 16)
292 png_error(png_ptr, "Invalid bit depth in IHDR");
293
294 if (color_type < 0 || color_type == 1 ||
295 color_type == 5 || color_type > 6)
296 png_error(png_ptr, "Invalid color type in IHDR");
297
298 if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
299 ((color_type == PNG_COLOR_TYPE_RGB ||
300 color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
301 color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
302 png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
303
304 if (interlace_type >= PNG_INTERLACE_LAST)
305 png_error(png_ptr, "Unknown interlace method in IHDR");
306
307 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
308 png_error(png_ptr, "Unknown compression method in IHDR");
309
310#if defined(PNG_MNG_FEATURES_SUPPORTED)
311 /* Accept filter_method 64 (intrapixel differencing) only if
312 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
313 * 2. Libpng did not read a PNG signature (this filter_method is only
314 * used in PNG datastreams that are embedded in MNG datastreams) and
315 * 3. The application called png_permit_mng_features with a mask that
316 * included PNG_FLAG_MNG_FILTER_64 and
317 * 4. The filter_method is 64 and
318 * 5. The color_type is RGB or RGBA
319 */
320 if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
321 png_warning(png_ptr,"MNG features are not allowed in a PNG datastream");
322 if(filter_type != PNG_FILTER_TYPE_BASE)
323 {
324 if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
325 (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
326 ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
327 (color_type == PNG_COLOR_TYPE_RGB ||
328 color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
329 png_error(png_ptr, "Unknown filter method in IHDR");
330 if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
331 png_warning(png_ptr, "Invalid filter method in IHDR");
332 }
333#else
334 if(filter_type != PNG_FILTER_TYPE_BASE)
335 png_error(png_ptr, "Unknown filter method in IHDR");
336#endif
337
338 info_ptr->width = width;
339 info_ptr->height = height;
340 info_ptr->bit_depth = (png_byte)bit_depth;
341 info_ptr->color_type =(png_byte) color_type;
342 info_ptr->compression_type = (png_byte)compression_type;
343 info_ptr->filter_type = (png_byte)filter_type;
344 info_ptr->interlace_type = (png_byte)interlace_type;
345 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
346 info_ptr->channels = 1;
347 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
348 info_ptr->channels = 3;
349 else
350 info_ptr->channels = 1;
351 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
352 info_ptr->channels++;
353 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
354
355 /* check for potential overflow */
356 if (width > (PNG_UINT_32_MAX
357 >> 3) /* 8-byte RGBA pixels */
358 - 64 /* bigrowbuf hack */
359 - 1 /* filter byte */
360 - 7*8 /* rounding of width to multiple of 8 pixels */
361 - 8) /* extra max_pixel_depth pad */
362 info_ptr->rowbytes = (png_size_t)0;
363 else
364 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width);
365}
366
367#if defined(PNG_oFFs_SUPPORTED)
368void PNGAPI
369png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
370 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
371{
372 png_debug1(1, "in %s storage function\n", "oFFs");
373 if (png_ptr == NULL || info_ptr == NULL)
374 return;
375
376 info_ptr->x_offset = offset_x;
377 info_ptr->y_offset = offset_y;
378 info_ptr->offset_unit_type = (png_byte)unit_type;
379 info_ptr->valid |= PNG_INFO_oFFs;
380}
381#endif
382
383#if defined(PNG_pCAL_SUPPORTED)
384void PNGAPI
385png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
386 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
387 png_charp units, png_charpp params)
388{
389 png_uint_32 length;
390 int i;
391
392 png_debug1(1, "in %s storage function\n", "pCAL");
393 if (png_ptr == NULL || info_ptr == NULL)
394 return;
395
396 length = png_strlen(purpose) + 1;
397 png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
398 info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
399 if (info_ptr->pcal_purpose == NULL)
400 {
401 png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
402 return;
403 }
404 png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
405
406 png_debug(3, "storing X0, X1, type, and nparams in info\n");
407 info_ptr->pcal_X0 = X0;
408 info_ptr->pcal_X1 = X1;
409 info_ptr->pcal_type = (png_byte)type;
410 info_ptr->pcal_nparams = (png_byte)nparams;
411
412 length = png_strlen(units) + 1;
413 png_debug1(3, "allocating units for info (%lu bytes)\n", length);
414 info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
415 if (info_ptr->pcal_units == NULL)
416 {
417 png_warning(png_ptr, "Insufficient memory for pCAL units.");
418 return;
419 }
420 png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
421
422 info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
423 (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
424 if (info_ptr->pcal_params == NULL)
425 {
426 png_warning(png_ptr, "Insufficient memory for pCAL params.");
427 return;
428 }
429
430 info_ptr->pcal_params[nparams] = NULL;
431
432 for (i = 0; i < nparams; i++)
433 {
434 length = png_strlen(params[i]) + 1;
435 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
436 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
437 if (info_ptr->pcal_params[i] == NULL)
438 {
439 png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
440 return;
441 }
442 png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
443 }
444
445 info_ptr->valid |= PNG_INFO_pCAL;
446#ifdef PNG_FREE_ME_SUPPORTED
447 info_ptr->free_me |= PNG_FREE_PCAL;
448#endif
449}
450#endif
451
452#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
453#ifdef PNG_FLOATING_POINT_SUPPORTED
454void PNGAPI
455png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
456 int unit, double width, double height)
457{
458 png_debug1(1, "in %s storage function\n", "sCAL");
459 if (png_ptr == NULL || info_ptr == NULL)
460 return;
461
462 info_ptr->scal_unit = (png_byte)unit;
463 info_ptr->scal_pixel_width = width;
464 info_ptr->scal_pixel_height = height;
465
466 info_ptr->valid |= PNG_INFO_sCAL;
467}
468#else
469#ifdef PNG_FIXED_POINT_SUPPORTED
470void PNGAPI
471png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
472 int unit, png_charp swidth, png_charp sheight)
473{
474 png_uint_32 length;
475
476 png_debug1(1, "in %s storage function\n", "sCAL");
477 if (png_ptr == NULL || info_ptr == NULL)
478 return;
479
480 info_ptr->scal_unit = (png_byte)unit;
481
482 length = png_strlen(swidth) + 1;
483 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
484 info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
485 if (info_ptr->scal_s_width == NULL)
486 {
487 png_warning(png_ptr,
488 "Memory allocation failed while processing sCAL.");
489 }
490 png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
491
492 length = png_strlen(sheight) + 1;
493 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
494 info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
495 if (info_ptr->scal_s_height == NULL)
496 {
497 png_free (png_ptr, info_ptr->scal_s_width);
498 png_warning(png_ptr,
499 "Memory allocation failed while processing sCAL.");
500 }
501 png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
502
503 info_ptr->valid |= PNG_INFO_sCAL;
504#ifdef PNG_FREE_ME_SUPPORTED
505 info_ptr->free_me |= PNG_FREE_SCAL;
506#endif
507}
508#endif
509#endif
510#endif
511
512#if defined(PNG_pHYs_SUPPORTED)
513void PNGAPI
514png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
515 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
516{
517 png_debug1(1, "in %s storage function\n", "pHYs");
518 if (png_ptr == NULL || info_ptr == NULL)
519 return;
520
521 info_ptr->x_pixels_per_unit = res_x;
522 info_ptr->y_pixels_per_unit = res_y;
523 info_ptr->phys_unit_type = (png_byte)unit_type;
524 info_ptr->valid |= PNG_INFO_pHYs;
525}
526#endif
527
528void PNGAPI
529png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
530 png_colorp palette, int num_palette)
531{
532
533 png_debug1(1, "in %s storage function\n", "PLTE");
534 if (png_ptr == NULL || info_ptr == NULL)
535 return;
536
537 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
538 {
539 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
540 png_error(png_ptr, "Invalid palette length");
541 else
542 {
543 png_warning(png_ptr, "Invalid palette length");
544 return;
545 }
546 }
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#ifdef PNG_FREE_ME_SUPPORTED
554 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
555#endif
556
557 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
558 of num_palette entries,
559 in case of an invalid PNG file that has too-large sample values. */
560 png_ptr->palette = (png_colorp)png_malloc(png_ptr,
561 PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
562 png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
563 png_sizeof(png_color));
564 png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color));
565 info_ptr->palette = png_ptr->palette;
566 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
567
568#ifdef PNG_FREE_ME_SUPPORTED
569 info_ptr->free_me |= PNG_FREE_PLTE;
570#else
571 png_ptr->flags |= PNG_FLAG_FREE_PLTE;
572#endif
573
574 info_ptr->valid |= PNG_INFO_PLTE;
575}
576
577#if defined(PNG_sBIT_SUPPORTED)
578void PNGAPI
579png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
580 png_color_8p sig_bit)
581{
582 png_debug1(1, "in %s storage function\n", "sBIT");
583 if (png_ptr == NULL || info_ptr == NULL)
584 return;
585
586 png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof (png_color_8));
587 info_ptr->valid |= PNG_INFO_sBIT;
588}
589#endif
590
591#if defined(PNG_sRGB_SUPPORTED)
592void PNGAPI
593png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
594{
595 png_debug1(1, "in %s storage function\n", "sRGB");
596 if (png_ptr == NULL || info_ptr == NULL)
597 return;
598
599 info_ptr->srgb_intent = (png_byte)intent;
600 info_ptr->valid |= PNG_INFO_sRGB;
601}
602
603void PNGAPI
604png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
605 int intent)
606{
607#if defined(PNG_gAMA_SUPPORTED)
608#ifdef PNG_FLOATING_POINT_SUPPORTED
609 float file_gamma;
610#endif
611#ifdef PNG_FIXED_POINT_SUPPORTED
612 png_fixed_point int_file_gamma;
613#endif
614#endif
615#if defined(PNG_cHRM_SUPPORTED)
616#ifdef PNG_FLOATING_POINT_SUPPORTED
617 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
618#endif
619#ifdef PNG_FIXED_POINT_SUPPORTED
620 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
621 int_green_y, int_blue_x, int_blue_y;
622#endif
623#endif
624 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
625 if (png_ptr == NULL || info_ptr == NULL)
626 return;
627
628 png_set_sRGB(png_ptr, info_ptr, intent);
629
630#if defined(PNG_gAMA_SUPPORTED)
631#ifdef PNG_FLOATING_POINT_SUPPORTED
632 file_gamma = (float).45455;
633 png_set_gAMA(png_ptr, info_ptr, file_gamma);
634#endif
635#ifdef PNG_FIXED_POINT_SUPPORTED
636 int_file_gamma = 45455L;
637 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
638#endif
639#endif
640
641#if defined(PNG_cHRM_SUPPORTED)
642#ifdef PNG_FIXED_POINT_SUPPORTED
643 int_white_x = 31270L;
644 int_white_y = 32900L;
645 int_red_x = 64000L;
646 int_red_y = 33000L;
647 int_green_x = 30000L;
648 int_green_y = 60000L;
649 int_blue_x = 15000L;
650 int_blue_y = 6000L;
651
652 png_set_cHRM_fixed(png_ptr, info_ptr,
653 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
654 int_blue_x, int_blue_y);
655#endif
656#ifdef PNG_FLOATING_POINT_SUPPORTED
657 white_x = (float).3127;
658 white_y = (float).3290;
659 red_x = (float).64;
660 red_y = (float).33;
661 green_x = (float).30;
662 green_y = (float).60;
663 blue_x = (float).15;
664 blue_y = (float).06;
665
666 png_set_cHRM(png_ptr, info_ptr,
667 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
668#endif
669#endif
670}
671#endif
672
673
674#if defined(PNG_iCCP_SUPPORTED)
675void PNGAPI
676png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
677 png_charp name, int compression_type,
678 png_charp profile, png_uint_32 proflen)
679{
680 png_charp new_iccp_name;
681 png_charp new_iccp_profile;
682
683 png_debug1(1, "in %s storage function\n", "iCCP");
684 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
685 return;
686
687 new_iccp_name = (png_charp)png_malloc_warn(png_ptr, png_strlen(name)+1);
688 if (new_iccp_name == NULL)
689 {
690 png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
691 return;
692 }
693 png_strncpy(new_iccp_name, name, png_sizeof(new_iccp_name));
694 new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
695 if (new_iccp_profile == NULL)
696 {
697 png_free (png_ptr, new_iccp_name);
698 png_warning(png_ptr, "Insufficient memory to process iCCP profile.");
699 return;
700 }
701 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
702
703 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
704
705 info_ptr->iccp_proflen = proflen;
706 info_ptr->iccp_name = new_iccp_name;
707 info_ptr->iccp_profile = new_iccp_profile;
708 /* Compression is always zero but is here so the API and info structure
709 * does not have to change if we introduce multiple compression types */
710 info_ptr->iccp_compression = (png_byte)compression_type;
711#ifdef PNG_FREE_ME_SUPPORTED
712 info_ptr->free_me |= PNG_FREE_ICCP;
713#endif
714 info_ptr->valid |= PNG_INFO_iCCP;
715}
716#endif
717
718#if defined(PNG_TEXT_SUPPORTED)
719void PNGAPI
720png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
721 int num_text)
722{
723 int ret;
724 ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
725 if (ret)
726 png_error(png_ptr, "Insufficient memory to store text");
727}
728
729int /* PRIVATE */
730png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
731 int num_text)
732{
733 int i;
734
735 png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
736 "text" : (png_const_charp)png_ptr->chunk_name));
737
738 if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
739 return(0);
740
741 /* Make sure we have enough space in the "text" array in info_struct
742 * to hold all of the incoming text_ptr objects.
743 */
744 if (info_ptr->num_text + num_text > info_ptr->max_text)
745 {
746 if (info_ptr->text != NULL)
747 {
748 png_textp old_text;
749 int old_max;
750
751 old_max = info_ptr->max_text;
752 info_ptr->max_text = info_ptr->num_text + num_text + 8;
753 old_text = info_ptr->text;
754 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
755 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
756 if (info_ptr->text == NULL)
757 {
758 png_free(png_ptr, old_text);
759 return(1);
760 }
761 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
762 png_sizeof(png_text)));
763 png_free(png_ptr, old_text);
764 }
765 else
766 {
767 info_ptr->max_text = num_text + 8;
768 info_ptr->num_text = 0;
769 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
770 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
771 if (info_ptr->text == NULL)
772 return(1);
773#ifdef PNG_FREE_ME_SUPPORTED
774 info_ptr->free_me |= PNG_FREE_TEXT;
775#endif
776 }
777 png_debug1(3, "allocated %d entries for info_ptr->text\n",
778 info_ptr->max_text);
779 }
780 for (i = 0; i < num_text; i++)
781 {
782 png_size_t text_length,key_len;
783 png_size_t lang_len,lang_key_len;
784 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
785
786 if (text_ptr[i].key == NULL)
787 continue;
788
789 key_len = png_strlen(text_ptr[i].key);
790
791 if(text_ptr[i].compression <= 0)
792 {
793 lang_len = 0;
794 lang_key_len = 0;
795 }
796 else
797#ifdef PNG_iTXt_SUPPORTED
798 {
799 /* set iTXt data */
800 if (text_ptr[i].lang != NULL)
801 lang_len = png_strlen(text_ptr[i].lang);
802 else
803 lang_len = 0;
804 if (text_ptr[i].lang_key != NULL)
805 lang_key_len = png_strlen(text_ptr[i].lang_key);
806 else
807 lang_key_len = 0;
808 }
809#else
810 {
811 png_warning(png_ptr, "iTXt chunk not supported.");
812 continue;
813 }
814#endif
815
816 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
817 {
818 text_length = 0;
819#ifdef PNG_iTXt_SUPPORTED
820 if(text_ptr[i].compression > 0)
821 textp->compression = PNG_ITXT_COMPRESSION_NONE;
822 else
823#endif
824 textp->compression = PNG_TEXT_COMPRESSION_NONE;
825 }
826 else
827 {
828 text_length = png_strlen(text_ptr[i].text);
829 textp->compression = text_ptr[i].compression;
830 }
831
832 textp->key = (png_charp)png_malloc_warn(png_ptr,
833 (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
834 if (textp->key == NULL)
835 return(1);
836 png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
837 (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
838 (int)textp->key);
839
840 png_memcpy(textp->key, text_ptr[i].key,
841 (png_size_t)(key_len));
842 *(textp->key+key_len) = '\0';
843#ifdef PNG_iTXt_SUPPORTED
844 if (text_ptr[i].compression > 0)
845 {
846 textp->lang=textp->key + key_len + 1;
847 png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
848 *(textp->lang+lang_len) = '\0';
849 textp->lang_key=textp->lang + lang_len + 1;
850 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
851 *(textp->lang_key+lang_key_len) = '\0';
852 textp->text=textp->lang_key + lang_key_len + 1;
853 }
854 else
855#endif
856 {
857#ifdef PNG_iTXt_SUPPORTED
858 textp->lang=NULL;
859 textp->lang_key=NULL;
860#endif
861 textp->text=textp->key + key_len + 1;
862 }
863 if(text_length)
864 png_memcpy(textp->text, text_ptr[i].text,
865 (png_size_t)(text_length));
866 *(textp->text+text_length) = '\0';
867
868#ifdef PNG_iTXt_SUPPORTED
869 if(textp->compression > 0)
870 {
871 textp->text_length = 0;
872 textp->itxt_length = text_length;
873 }
874 else
875#endif
876 {
877 textp->text_length = text_length;
878#ifdef PNG_iTXt_SUPPORTED
879 textp->itxt_length = 0;
880#endif
881 }
882 info_ptr->num_text++;
883 png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
884 }
885 return(0);
886}
887#endif
888
889#if defined(PNG_tIME_SUPPORTED)
890void PNGAPI
891png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
892{
893 png_debug1(1, "in %s storage function\n", "tIME");
894 if (png_ptr == NULL || info_ptr == NULL ||
895 (png_ptr->mode & PNG_WROTE_tIME))
896 return;
897
898 png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof (png_time));
899 info_ptr->valid |= PNG_INFO_tIME;
900}
901#endif
902
903#if defined(PNG_tRNS_SUPPORTED)
904void PNGAPI
905png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
906 png_bytep trans, int num_trans, png_color_16p trans_values)
907{
908 png_debug1(1, "in %s storage function\n", "tRNS");
909 if (png_ptr == NULL || info_ptr == NULL)
910 return;
911
912 if (trans != NULL)
913 {
914 /*
915 * It may not actually be necessary to set png_ptr->trans here;
916 * we do it for backward compatibility with the way the png_handle_tRNS
917 * function used to do the allocation.
918 */
919#ifdef PNG_FREE_ME_SUPPORTED
920 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
921#endif
922 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
923 png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
924 (png_uint_32)PNG_MAX_PALETTE_LENGTH);
925 if (num_trans <= PNG_MAX_PALETTE_LENGTH)
926 png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
927#ifdef PNG_FREE_ME_SUPPORTED
928 info_ptr->free_me |= PNG_FREE_TRNS;
929#else
930 png_ptr->flags |= PNG_FLAG_FREE_TRNS;
931#endif
932 }
933
934 if (trans_values != NULL)
935 {
936 png_memcpy(&(info_ptr->trans_values), trans_values,
937 png_sizeof(png_color_16));
938 if (num_trans == 0)
939 num_trans = 1;
940 }
941 info_ptr->num_trans = (png_uint_16)num_trans;
942 info_ptr->valid |= PNG_INFO_tRNS;
943}
944#endif
945
946#if defined(PNG_sPLT_SUPPORTED)
947void PNGAPI
948png_set_sPLT(png_structp png_ptr,
949 png_infop info_ptr, png_sPLT_tp entries, int nentries)
950{
951 png_sPLT_tp np;
952 int i;
953
954 if (png_ptr == NULL || info_ptr == NULL)
955 return;
956
957 np = (png_sPLT_tp)png_malloc_warn(png_ptr,
958 (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t));
959 if (np == NULL)
960 {
961 png_warning(png_ptr, "No memory for sPLT palettes.");
962 return;
963 }
964
965 png_memcpy(np, info_ptr->splt_palettes,
966 info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
967 png_free(png_ptr, info_ptr->splt_palettes);
968 info_ptr->splt_palettes=NULL;
969
970 for (i = 0; i < nentries; i++)
971 {
972 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
973 png_sPLT_tp from = entries + i;
974
975 to->name = (png_charp)png_malloc_warn(png_ptr,
976 png_strlen(from->name) + 1);
977 if (to->name == NULL)
978 {
979 png_warning(png_ptr,
980 "Out of memory while processing sPLT chunk");
981 }
982 /* TODO: use png_malloc_warn */
983 png_strncpy(to->name, from->name, png_strlen(from->name));
984 to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
985 from->nentries * png_sizeof(png_sPLT_entry));
986 /* TODO: use png_malloc_warn */
987 png_memcpy(to->entries, from->entries,
988 from->nentries * png_sizeof(png_sPLT_entry));
989 if (to->entries == NULL)
990 {
991 png_warning(png_ptr,
992 "Out of memory while processing sPLT chunk");
993 png_free(png_ptr,to->name);
994 to->name = NULL;
995 }
996 to->nentries = from->nentries;
997 to->depth = from->depth;
998 }
999
1000 info_ptr->splt_palettes = np;
1001 info_ptr->splt_palettes_num += nentries;
1002 info_ptr->valid |= PNG_INFO_sPLT;
1003#ifdef PNG_FREE_ME_SUPPORTED
1004 info_ptr->free_me |= PNG_FREE_SPLT;
1005#endif
1006}
1007#endif /* PNG_sPLT_SUPPORTED */
1008
1009#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1010void PNGAPI
1011png_set_unknown_chunks(png_structp png_ptr,
1012 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
1013{
1014 png_unknown_chunkp np;
1015 int i;
1016
1017 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
1018 return;
1019
1020 np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
1021 (info_ptr->unknown_chunks_num + num_unknowns) *
1022 png_sizeof(png_unknown_chunk));
1023 if (np == NULL)
1024 {
1025 png_warning(png_ptr,
1026 "Out of memory while processing unknown chunk.");
1027 return;
1028 }
1029
1030 png_memcpy(np, info_ptr->unknown_chunks,
1031 info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
1032 png_free(png_ptr, info_ptr->unknown_chunks);
1033 info_ptr->unknown_chunks=NULL;
1034
1035 for (i = 0; i < num_unknowns; i++)
1036 {
1037 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
1038 png_unknown_chunkp from = unknowns + i;
1039
1040 png_strncpy((png_charp)to->name, (png_charp)from->name, 5);
1041 to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
1042 if (to->data == NULL)
1043 {
1044 png_warning(png_ptr,
1045 "Out of memory while processing unknown chunk.");
1046 }
1047 else
1048 {
1049 png_memcpy(to->data, from->data, from->size);
1050 to->size = from->size;
1051
1052 /* note our location in the read or write sequence */
1053 to->location = (png_byte)(png_ptr->mode & 0xff);
1054 }
1055 }
1056
1057 info_ptr->unknown_chunks = np;
1058 info_ptr->unknown_chunks_num += num_unknowns;
1059#ifdef PNG_FREE_ME_SUPPORTED
1060 info_ptr->free_me |= PNG_FREE_UNKN;
1061#endif
1062}
1063void PNGAPI
1064png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
1065 int chunk, int location)
1066{
1067 if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
1068 (int)info_ptr->unknown_chunks_num)
1069 info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1070}
1071#endif
1072
1073#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
1074#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1075 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1076void PNGAPI
1077png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
1078{
1079 /* This function is deprecated in favor of png_permit_mng_features()
1080 and will be removed from libpng-1.3.0 */
1081 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
1082 if (png_ptr == NULL)
1083 return;
1084 png_ptr->mng_features_permitted = (png_byte)
1085 ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
1086 ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
1087}
1088#endif
1089#endif
1090
1091#if defined(PNG_MNG_FEATURES_SUPPORTED)
1092png_uint_32 PNGAPI
1093png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1094{
1095 png_debug(1, "in png_permit_mng_features\n");
1096 if (png_ptr == NULL)
1097 return (png_uint_32)0;
1098 png_ptr->mng_features_permitted =
1099 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1100 return (png_uint_32)png_ptr->mng_features_permitted;
1101}
1102#endif
1103
1104#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1105void PNGAPI
1106png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1107 chunk_list, int num_chunks)
1108{
1109 png_bytep new_list, p;
1110 int i, old_num_chunks;
1111 if (png_ptr == NULL)
1112 return;
1113 if (num_chunks == 0)
1114 {
1115 if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
1116 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1117 else
1118 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1119
1120 if(keep == PNG_HANDLE_CHUNK_ALWAYS)
1121 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1122 else
1123 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1124 return;
1125 }
1126 if (chunk_list == NULL)
1127 return;
1128 old_num_chunks=png_ptr->num_chunk_list;
1129 new_list=(png_bytep)png_malloc(png_ptr,
1130 (png_uint_32)(5*(num_chunks+old_num_chunks)));
1131 if(png_ptr->chunk_list != NULL)
1132 {
1133 png_memcpy(new_list, png_ptr->chunk_list,
1134 (png_size_t)(5*old_num_chunks));
1135 png_free(png_ptr, png_ptr->chunk_list);
1136 png_ptr->chunk_list=NULL;
1137 }
1138 png_memcpy(new_list+5*old_num_chunks, chunk_list,
1139 (png_size_t)(5*num_chunks));
1140 for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
1141 *p=(png_byte)keep;
1142 png_ptr->num_chunk_list=old_num_chunks+num_chunks;
1143 png_ptr->chunk_list=new_list;
1144#ifdef PNG_FREE_ME_SUPPORTED
1145 png_ptr->free_me |= PNG_FREE_LIST;
1146#endif
1147}
1148#endif
1149
1150#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1151void PNGAPI
1152png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1153 png_user_chunk_ptr read_user_chunk_fn)
1154{
1155 png_debug(1, "in png_set_read_user_chunk_fn\n");
1156 if (png_ptr == NULL)
1157 return;
1158 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1159 png_ptr->user_chunk_ptr = user_chunk_ptr;
1160}
1161#endif
1162
1163#if defined(PNG_INFO_IMAGE_SUPPORTED)
1164void PNGAPI
1165png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1166{
1167 png_debug1(1, "in %s storage function\n", "rows");
1168
1169 if (png_ptr == NULL || info_ptr == NULL)
1170 return;
1171
1172 if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1173 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1174 info_ptr->row_pointers = row_pointers;
1175 if(row_pointers)
1176 info_ptr->valid |= PNG_INFO_IDAT;
1177}
1178#endif
1179
1180#ifdef PNG_WRITE_SUPPORTED
1181void PNGAPI
1182png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
1183{
1184 if (png_ptr == NULL)
1185 return;
1186 if(png_ptr->zbuf)
1187 png_free(png_ptr, png_ptr->zbuf);
1188 png_ptr->zbuf_size = (png_size_t)size;
1189 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1190 png_ptr->zstream.next_out = png_ptr->zbuf;
1191 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1192}
1193#endif
1194
1195void PNGAPI
1196png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1197{
1198 if (png_ptr && info_ptr)
1199 info_ptr->valid &= ~(mask);
1200}
1201
1202
1203#ifndef PNG_1_0_X
1204#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1205/* function was added to libpng 1.2.0 and should always exist by default */
1206void PNGAPI
1207png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1208{
1209/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1210 if (png_ptr != NULL)
1211 png_ptr->asm_flags = 0;
1212}
1213
1214/* this function was added to libpng 1.2.0 */
1215void PNGAPI
1216png_set_mmx_thresholds (png_structp png_ptr,
1217 png_byte mmx_bitdepth_threshold,
1218 png_uint_32 mmx_rowbytes_threshold)
1219{
1220/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1221 if (png_ptr == NULL)
1222 return;
1223}
1224#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1225
1226#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1227/* this function was added to libpng 1.2.6 */
1228void PNGAPI
1229png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
1230 png_uint_32 user_height_max)
1231{
1232 /* Images with dimensions larger than these limits will be
1233 * rejected by png_set_IHDR(). To accept any PNG datastream
1234 * regardless of dimensions, set both limits to 0x7ffffffL.
1235 */
1236 if(png_ptr == NULL) return;
1237 png_ptr->user_width_max = user_width_max;
1238 png_ptr->user_height_max = user_height_max;
1239}
1240#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1241
1242#endif /* ?PNG_1_0_X */
1243#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
wxWidgets (Impactor)