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* Datasets becomes the new trunk and retires after that :-)
author mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
date Sun, 29 Jun 2008 18:44:17 +0000
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-1:000000000000 0:4a0efb7baf70
1
2 /* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.2.27 [April 29, 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 */
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)
22 void PNGAPI
23 png_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
36 void PNGAPI
37 png_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 if (!(white_x || white_y || red_x || red_y || green_x || green_y ||
45 blue_x || blue_y))
46 {
47 png_warning(png_ptr,
48 "Ignoring attempt to set all-zero chromaticity values");
49 return;
50 }
51 if (white_x < 0.0 || white_y < 0.0 ||
52 red_x < 0.0 || red_y < 0.0 ||
53 green_x < 0.0 || green_y < 0.0 ||
54 blue_x < 0.0 || blue_y < 0.0)
55 {
56 png_warning(png_ptr,
57 "Ignoring attempt to set negative chromaticity value");
58 return;
59 }
60 if (white_x > 21474.83 || white_y > 21474.83 ||
61 red_x > 21474.83 || red_y > 21474.83 ||
62 green_x > 21474.83 || green_y > 21474.83 ||
63 blue_x > 21474.83 || blue_y > 21474.83)
64 {
65 png_warning(png_ptr,
66 "Ignoring attempt to set chromaticity value exceeding 21474.83");
67 return;
68 }
69
70 info_ptr->x_white = (float)white_x;
71 info_ptr->y_white = (float)white_y;
72 info_ptr->x_red = (float)red_x;
73 info_ptr->y_red = (float)red_y;
74 info_ptr->x_green = (float)green_x;
75 info_ptr->y_green = (float)green_y;
76 info_ptr->x_blue = (float)blue_x;
77 info_ptr->y_blue = (float)blue_y;
78 #ifdef PNG_FIXED_POINT_SUPPORTED
79 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
80 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
81 info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5);
82 info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5);
83 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
84 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
85 info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5);
86 info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5);
87 #endif
88 info_ptr->valid |= PNG_INFO_cHRM;
89 }
90 #endif
91 #ifdef PNG_FIXED_POINT_SUPPORTED
92 void PNGAPI
93 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
94 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
95 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
96 png_fixed_point blue_x, png_fixed_point blue_y)
97 {
98 png_debug1(1, "in %s storage function\n", "cHRM");
99 if (png_ptr == NULL || info_ptr == NULL)
100 return;
101
102 if (!(white_x || white_y || red_x || red_y || green_x || green_y ||
103 blue_x || blue_y))
104 {
105 png_warning(png_ptr,
106 "Ignoring attempt to set all-zero chromaticity values");
107 return;
108 }
109 if (white_x < 0 || white_y < 0 ||
110 red_x < 0 || red_y < 0 ||
111 green_x < 0 || green_y < 0 ||
112 blue_x < 0 || blue_y < 0)
113 {
114 png_warning(png_ptr,
115 "Ignoring attempt to set negative chromaticity value");
116 return;
117 }
118 if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
119 white_y > (png_fixed_point) PNG_UINT_31_MAX ||
120 red_x > (png_fixed_point) PNG_UINT_31_MAX ||
121 red_y > (png_fixed_point) PNG_UINT_31_MAX ||
122 green_x > (png_fixed_point) PNG_UINT_31_MAX ||
123 green_y > (png_fixed_point) PNG_UINT_31_MAX ||
124 blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
125 blue_y > (png_fixed_point) PNG_UINT_31_MAX )
126 {
127 png_warning(png_ptr,
128 "Ignoring attempt to set chromaticity value exceeding 21474.83");
129 return;
130 }
131 info_ptr->int_x_white = white_x;
132 info_ptr->int_y_white = white_y;
133 info_ptr->int_x_red = red_x;
134 info_ptr->int_y_red = red_y;
135 info_ptr->int_x_green = green_x;
136 info_ptr->int_y_green = green_y;
137 info_ptr->int_x_blue = blue_x;
138 info_ptr->int_y_blue = blue_y;
139 #ifdef PNG_FLOATING_POINT_SUPPORTED
140 info_ptr->x_white = (float)(white_x/100000.);
141 info_ptr->y_white = (float)(white_y/100000.);
142 info_ptr->x_red = (float)( red_x/100000.);
143 info_ptr->y_red = (float)( red_y/100000.);
144 info_ptr->x_green = (float)(green_x/100000.);
145 info_ptr->y_green = (float)(green_y/100000.);
146 info_ptr->x_blue = (float)( blue_x/100000.);
147 info_ptr->y_blue = (float)( blue_y/100000.);
148 #endif
149 info_ptr->valid |= PNG_INFO_cHRM;
150 }
151 #endif
152 #endif
153
154 #if defined(PNG_gAMA_SUPPORTED)
155 #ifdef PNG_FLOATING_POINT_SUPPORTED
156 void PNGAPI
157 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
158 {
159 double gamma;
160 png_debug1(1, "in %s storage function\n", "gAMA");
161 if (png_ptr == NULL || info_ptr == NULL)
162 return;
163
164 /* Check for overflow */
165 if (file_gamma > 21474.83)
166 {
167 png_warning(png_ptr, "Limiting gamma to 21474.83");
168 gamma=21474.83;
169 }
170 else
171 gamma=file_gamma;
172 info_ptr->gamma = (float)gamma;
173 #ifdef PNG_FIXED_POINT_SUPPORTED
174 info_ptr->int_gamma = (int)(gamma*100000.+.5);
175 #endif
176 info_ptr->valid |= PNG_INFO_gAMA;
177 if(gamma == 0.0)
178 png_warning(png_ptr, "Setting gamma=0");
179 }
180 #endif
181 void PNGAPI
182 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
183 int_gamma)
184 {
185 png_fixed_point gamma;
186
187 png_debug1(1, "in %s storage function\n", "gAMA");
188 if (png_ptr == NULL || info_ptr == NULL)
189 return;
190
191 if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
192 {
193 png_warning(png_ptr, "Limiting gamma to 21474.83");
194 gamma=PNG_UINT_31_MAX;
195 }
196 else
197 {
198 if (int_gamma < 0)
199 {
200 png_warning(png_ptr, "Setting negative gamma to zero");
201 gamma=0;
202 }
203 else
204 gamma=int_gamma;
205 }
206 #ifdef PNG_FLOATING_POINT_SUPPORTED
207 info_ptr->gamma = (float)(gamma/100000.);
208 #endif
209 #ifdef PNG_FIXED_POINT_SUPPORTED
210 info_ptr->int_gamma = gamma;
211 #endif
212 info_ptr->valid |= PNG_INFO_gAMA;
213 if(gamma == 0)
214 png_warning(png_ptr, "Setting gamma=0");
215 }
216 #endif
217
218 #if defined(PNG_hIST_SUPPORTED)
219 void PNGAPI
220 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
221 {
222 int i;
223
224 png_debug1(1, "in %s storage function\n", "hIST");
225 if (png_ptr == NULL || info_ptr == NULL)
226 return;
227 if (info_ptr->num_palette == 0 || info_ptr->num_palette
228 > PNG_MAX_PALETTE_LENGTH)
229 {
230 png_warning(png_ptr,
231 "Invalid palette size, hIST allocation skipped.");
232 return;
233 }
234
235 #ifdef PNG_FREE_ME_SUPPORTED
236 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
237 #endif
238 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
239 1.2.1 */
240 png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
241 (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof (png_uint_16)));
242 if (png_ptr->hist == NULL)
243 {
244 png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
245 return;
246 }
247
248 for (i = 0; i < info_ptr->num_palette; i++)
249 png_ptr->hist[i] = hist[i];
250 info_ptr->hist = png_ptr->hist;
251 info_ptr->valid |= PNG_INFO_hIST;
252
253 #ifdef PNG_FREE_ME_SUPPORTED
254 info_ptr->free_me |= PNG_FREE_HIST;
255 #else
256 png_ptr->flags |= PNG_FLAG_FREE_HIST;
257 #endif
258 }
259 #endif
260
261 void PNGAPI
262 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
263 png_uint_32 width, png_uint_32 height, int bit_depth,
264 int color_type, int interlace_type, int compression_type,
265 int filter_type)
266 {
267 png_debug1(1, "in %s storage function\n", "IHDR");
268 if (png_ptr == NULL || info_ptr == NULL)
269 return;
270
271 /* check for width and height valid values */
272 if (width == 0 || height == 0)
273 png_error(png_ptr, "Image width or height is zero in IHDR");
274 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
275 if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
276 png_error(png_ptr, "image size exceeds user limits in IHDR");
277 #else
278 if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
279 png_error(png_ptr, "image size exceeds user limits in IHDR");
280 #endif
281 if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
282 png_error(png_ptr, "Invalid image size in IHDR");
283 if ( width > (PNG_UINT_32_MAX
284 >> 3) /* 8-byte RGBA pixels */
285 - 64 /* bigrowbuf hack */
286 - 1 /* filter byte */
287 - 7*8 /* rounding of width to multiple of 8 pixels */
288 - 8) /* extra max_pixel_depth pad */
289 png_warning(png_ptr, "Width is too large for libpng to process pixels");
290
291 /* check other values */
292 if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
293 bit_depth != 8 && bit_depth != 16)
294 png_error(png_ptr, "Invalid bit depth in IHDR");
295
296 if (color_type < 0 || color_type == 1 ||
297 color_type == 5 || color_type > 6)
298 png_error(png_ptr, "Invalid color type in IHDR");
299
300 if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
301 ((color_type == PNG_COLOR_TYPE_RGB ||
302 color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
303 color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
304 png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
305
306 if (interlace_type >= PNG_INTERLACE_LAST)
307 png_error(png_ptr, "Unknown interlace method in IHDR");
308
309 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
310 png_error(png_ptr, "Unknown compression method in IHDR");
311
312 #if defined(PNG_MNG_FEATURES_SUPPORTED)
313 /* Accept filter_method 64 (intrapixel differencing) only if
314 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
315 * 2. Libpng did not read a PNG signature (this filter_method is only
316 * used in PNG datastreams that are embedded in MNG datastreams) and
317 * 3. The application called png_permit_mng_features with a mask that
318 * included PNG_FLAG_MNG_FILTER_64 and
319 * 4. The filter_method is 64 and
320 * 5. The color_type is RGB or RGBA
321 */
322 if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
323 png_warning(png_ptr,"MNG features are not allowed in a PNG datastream");
324 if(filter_type != PNG_FILTER_TYPE_BASE)
325 {
326 if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
327 (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
328 ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
329 (color_type == PNG_COLOR_TYPE_RGB ||
330 color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
331 png_error(png_ptr, "Unknown filter method in IHDR");
332 if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
333 png_warning(png_ptr, "Invalid filter method in IHDR");
334 }
335 #else
336 if(filter_type != PNG_FILTER_TYPE_BASE)
337 png_error(png_ptr, "Unknown filter method in IHDR");
338 #endif
339
340 info_ptr->width = width;
341 info_ptr->height = height;
342 info_ptr->bit_depth = (png_byte)bit_depth;
343 info_ptr->color_type =(png_byte) color_type;
344 info_ptr->compression_type = (png_byte)compression_type;
345 info_ptr->filter_type = (png_byte)filter_type;
346 info_ptr->interlace_type = (png_byte)interlace_type;
347 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
348 info_ptr->channels = 1;
349 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
350 info_ptr->channels = 3;
351 else
352 info_ptr->channels = 1;
353 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
354 info_ptr->channels++;
355 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
356
357 /* check for potential overflow */
358 if (width > (PNG_UINT_32_MAX
359 >> 3) /* 8-byte RGBA pixels */
360 - 64 /* bigrowbuf hack */
361 - 1 /* filter byte */
362 - 7*8 /* rounding of width to multiple of 8 pixels */
363 - 8) /* extra max_pixel_depth pad */
364 info_ptr->rowbytes = (png_size_t)0;
365 else
366 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width);
367 }
368
369 #if defined(PNG_oFFs_SUPPORTED)
370 void PNGAPI
371 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
372 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
373 {
374 png_debug1(1, "in %s storage function\n", "oFFs");
375 if (png_ptr == NULL || info_ptr == NULL)
376 return;
377
378 info_ptr->x_offset = offset_x;
379 info_ptr->y_offset = offset_y;
380 info_ptr->offset_unit_type = (png_byte)unit_type;
381 info_ptr->valid |= PNG_INFO_oFFs;
382 }
383 #endif
384
385 #if defined(PNG_pCAL_SUPPORTED)
386 void PNGAPI
387 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
388 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
389 png_charp units, png_charpp params)
390 {
391 png_uint_32 length;
392 int i;
393
394 png_debug1(1, "in %s storage function\n", "pCAL");
395 if (png_ptr == NULL || info_ptr == NULL)
396 return;
397
398 length = png_strlen(purpose) + 1;
399 png_debug1(3, "allocating purpose for info (%lu bytes)\n", 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);
407
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;
413
414 length = png_strlen(units) + 1;
415 png_debug1(3, "allocating units for info (%lu bytes)\n", length);
416 info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
417 if (info_ptr->pcal_units == NULL)
418 {
419 png_warning(png_ptr, "Insufficient memory for pCAL units.");
420 return;
421 }
422 png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
423
424 info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
425 (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
426 if (info_ptr->pcal_params == NULL)
427 {
428 png_warning(png_ptr, "Insufficient memory for pCAL params.");
429 return;
430 }
431
432 info_ptr->pcal_params[nparams] = NULL;
433
434 for (i = 0; i < nparams; i++)
435 {
436 length = png_strlen(params[i]) + 1;
437 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
438 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
439 if (info_ptr->pcal_params[i] == NULL)
440 {
441 png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
442 return;
443 }
444 png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
445 }
446
447 info_ptr->valid |= PNG_INFO_pCAL;
448 #ifdef PNG_FREE_ME_SUPPORTED
449 info_ptr->free_me |= PNG_FREE_PCAL;
450 #endif
451 }
452 #endif
453
454 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
455 #ifdef PNG_FLOATING_POINT_SUPPORTED
456 void PNGAPI
457 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
458 int unit, double width, double height)
459 {
460 png_debug1(1, "in %s storage function\n", "sCAL");
461 if (png_ptr == NULL || info_ptr == NULL)
462 return;
463
464 info_ptr->scal_unit = (png_byte)unit;
465 info_ptr->scal_pixel_width = width;
466 info_ptr->scal_pixel_height = height;
467
468 info_ptr->valid |= PNG_INFO_sCAL;
469 }
470 #else
471 #ifdef PNG_FIXED_POINT_SUPPORTED
472 void PNGAPI
473 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
474 int unit, png_charp swidth, png_charp sheight)
475 {
476 png_uint_32 length;
477
478 png_debug1(1, "in %s storage function\n", "sCAL");
479 if (png_ptr == NULL || info_ptr == NULL)
480 return;
481
482 info_ptr->scal_unit = (png_byte)unit;
483
484 length = png_strlen(swidth) + 1;
485 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
486 info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
487 if (info_ptr->scal_s_width == NULL)
488 {
489 png_warning(png_ptr,
490 "Memory allocation failed while processing sCAL.");
491 return;
492 }
493 png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
494
495 length = png_strlen(sheight) + 1;
496 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
497 info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
498 if (info_ptr->scal_s_height == NULL)
499 {
500 png_free (png_ptr, info_ptr->scal_s_width);
501 png_warning(png_ptr,
502 "Memory allocation failed while processing sCAL.");
503 return;
504 }
505 png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
506 info_ptr->valid |= PNG_INFO_sCAL;
507 #ifdef PNG_FREE_ME_SUPPORTED
508 info_ptr->free_me |= PNG_FREE_SCAL;
509 #endif
510 }
511 #endif
512 #endif
513 #endif
514
515 #if defined(PNG_pHYs_SUPPORTED)
516 void PNGAPI
517 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
518 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
519 {
520 png_debug1(1, "in %s storage function\n", "pHYs");
521 if (png_ptr == NULL || info_ptr == NULL)
522 return;
523
524 info_ptr->x_pixels_per_unit = res_x;
525 info_ptr->y_pixels_per_unit = res_y;
526 info_ptr->phys_unit_type = (png_byte)unit_type;
527 info_ptr->valid |= PNG_INFO_pHYs;
528 }
529 #endif
530
531 void PNGAPI
532 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
533 png_colorp palette, int num_palette)
534 {
535
536 png_debug1(1, "in %s storage function\n", "PLTE");
537 if (png_ptr == NULL || info_ptr == NULL)
538 return;
539
540 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
541 {
542 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
543 png_error(png_ptr, "Invalid palette length");
544 else
545 {
546 png_warning(png_ptr, "Invalid palette length");
547 return;
548 }
549 }
550
551 /*
552 * It may not actually be necessary to set png_ptr->palette here;
553 * we do it for backward compatibility with the way the png_handle_tRNS
554 * function used to do the allocation.
555 */
556 #ifdef PNG_FREE_ME_SUPPORTED
557 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
558 #endif
559
560 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
561 of num_palette entries,
562 in case of an invalid PNG file that has too-large sample values. */
563 png_ptr->palette = (png_colorp)png_malloc(png_ptr,
564 PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
565 png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
566 png_sizeof(png_color));
567 png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color));
568 info_ptr->palette = png_ptr->palette;
569 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
570
571 #ifdef PNG_FREE_ME_SUPPORTED
572 info_ptr->free_me |= PNG_FREE_PLTE;
573 #else
574 png_ptr->flags |= PNG_FLAG_FREE_PLTE;
575 #endif
576
577 info_ptr->valid |= PNG_INFO_PLTE;
578 }
579
580 #if defined(PNG_sBIT_SUPPORTED)
581 void PNGAPI
582 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
583 png_color_8p sig_bit)
584 {
585 png_debug1(1, "in %s storage function\n", "sBIT");
586 if (png_ptr == NULL || info_ptr == NULL)
587 return;
588
589 png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof (png_color_8));
590 info_ptr->valid |= PNG_INFO_sBIT;
591 }
592 #endif
593
594 #if defined(PNG_sRGB_SUPPORTED)
595 void PNGAPI
596 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
597 {
598 png_debug1(1, "in %s storage function\n", "sRGB");
599 if (png_ptr == NULL || info_ptr == NULL)
600 return;
601
602 info_ptr->srgb_intent = (png_byte)intent;
603 info_ptr->valid |= PNG_INFO_sRGB;
604 }
605
606 void PNGAPI
607 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
608 int intent)
609 {
610 #if defined(PNG_gAMA_SUPPORTED)
611 #ifdef PNG_FLOATING_POINT_SUPPORTED
612 float file_gamma;
613 #endif
614 #ifdef PNG_FIXED_POINT_SUPPORTED
615 png_fixed_point int_file_gamma;
616 #endif
617 #endif
618 #if defined(PNG_cHRM_SUPPORTED)
619 #ifdef PNG_FLOATING_POINT_SUPPORTED
620 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
621 #endif
622 #ifdef PNG_FIXED_POINT_SUPPORTED
623 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
624 int_green_y, int_blue_x, int_blue_y;
625 #endif
626 #endif
627 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
628 if (png_ptr == NULL || info_ptr == NULL)
629 return;
630
631 png_set_sRGB(png_ptr, info_ptr, intent);
632
633 #if defined(PNG_gAMA_SUPPORTED)
634 #ifdef PNG_FLOATING_POINT_SUPPORTED
635 file_gamma = (float).45455;
636 png_set_gAMA(png_ptr, info_ptr, file_gamma);
637 #endif
638 #ifdef PNG_FIXED_POINT_SUPPORTED
639 int_file_gamma = 45455L;
640 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
641 #endif
642 #endif
643
644 #if defined(PNG_cHRM_SUPPORTED)
645 #ifdef PNG_FIXED_POINT_SUPPORTED
646 int_white_x = 31270L;
647 int_white_y = 32900L;
648 int_red_x = 64000L;
649 int_red_y = 33000L;
650 int_green_x = 30000L;
651 int_green_y = 60000L;
652 int_blue_x = 15000L;
653 int_blue_y = 6000L;
654
655 png_set_cHRM_fixed(png_ptr, info_ptr,
656 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
657 int_blue_x, int_blue_y);
658 #endif
659 #ifdef PNG_FLOATING_POINT_SUPPORTED
660 white_x = (float).3127;
661 white_y = (float).3290;
662 red_x = (float).64;
663 red_y = (float).33;
664 green_x = (float).30;
665 green_y = (float).60;
666 blue_x = (float).15;
667 blue_y = (float).06;
668
669 png_set_cHRM(png_ptr, info_ptr,
670 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
671 #endif
672 #endif
673 }
674 #endif
675
676
677 #if defined(PNG_iCCP_SUPPORTED)
678 void PNGAPI
679 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
680 png_charp name, int compression_type,
681 png_charp profile, png_uint_32 proflen)
682 {
683 png_charp new_iccp_name;
684 png_charp new_iccp_profile;
685 png_uint_32 length;
686
687 png_debug1(1, "in %s storage function\n", "iCCP");
688 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
689 return;
690
691 length = png_strlen(name)+1;
692 new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
693 if (new_iccp_name == NULL)
694 {
695 png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
696 return;
697 }
698 png_memcpy(new_iccp_name, name, length);
699 new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
700 if (new_iccp_profile == NULL)
701 {
702 png_free (png_ptr, new_iccp_name);
703 png_warning(png_ptr, "Insufficient memory to process iCCP profile.");
704 return;
705 }
706 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
707
708 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
709
710 info_ptr->iccp_proflen = proflen;
711 info_ptr->iccp_name = new_iccp_name;
712 info_ptr->iccp_profile = new_iccp_profile;
713 /* Compression is always zero but is here so the API and info structure
714 * does not have to change if we introduce multiple compression types */
715 info_ptr->iccp_compression = (png_byte)compression_type;
716 #ifdef PNG_FREE_ME_SUPPORTED
717 info_ptr->free_me |= PNG_FREE_ICCP;
718 #endif
719 info_ptr->valid |= PNG_INFO_iCCP;
720 }
721 #endif
722
723 #if defined(PNG_TEXT_SUPPORTED)
724 void PNGAPI
725 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
726 int num_text)
727 {
728 int ret;
729 ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
730 if (ret)
731 png_error(png_ptr, "Insufficient memory to store text");
732 }
733
734 int /* PRIVATE */
735 png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
736 int num_text)
737 {
738 int i;
739
740 png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
741 "text" : (png_const_charp)png_ptr->chunk_name));
742
743 if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
744 return(0);
745
746 /* Make sure we have enough space in the "text" array in info_struct
747 * to hold all of the incoming text_ptr objects.
748 */
749 if (info_ptr->num_text + num_text > info_ptr->max_text)
750 {
751 if (info_ptr->text != NULL)
752 {
753 png_textp old_text;
754 int old_max;
755
756 old_max = info_ptr->max_text;
757 info_ptr->max_text = info_ptr->num_text + num_text + 8;
758 old_text = info_ptr->text;
759 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
760 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
761 if (info_ptr->text == NULL)
762 {
763 png_free(png_ptr, old_text);
764 return(1);
765 }
766 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
767 png_sizeof(png_text)));
768 png_free(png_ptr, old_text);
769 }
770 else
771 {
772 info_ptr->max_text = num_text + 8;
773 info_ptr->num_text = 0;
774 info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
775 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
776 if (info_ptr->text == NULL)
777 return(1);
778 #ifdef PNG_FREE_ME_SUPPORTED
779 info_ptr->free_me |= PNG_FREE_TEXT;
780 #endif
781 }
782 png_debug1(3, "allocated %d entries for info_ptr->text\n",
783 info_ptr->max_text);
784 }
785 for (i = 0; i < num_text; i++)
786 {
787 png_size_t text_length,key_len;
788 png_size_t lang_len,lang_key_len;
789 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
790
791 if (text_ptr[i].key == NULL)
792 continue;
793
794 key_len = png_strlen(text_ptr[i].key);
795
796 if(text_ptr[i].compression <= 0)
797 {
798 lang_len = 0;
799 lang_key_len = 0;
800 }
801 else
802 #ifdef PNG_iTXt_SUPPORTED
803 {
804 /* set iTXt data */
805 if (text_ptr[i].lang != NULL)
806 lang_len = png_strlen(text_ptr[i].lang);
807 else
808 lang_len = 0;
809 if (text_ptr[i].lang_key != NULL)
810 lang_key_len = png_strlen(text_ptr[i].lang_key);
811 else
812 lang_key_len = 0;
813 }
814 #else
815 {
816 png_warning(png_ptr, "iTXt chunk not supported.");
817 continue;
818 }
819 #endif
820
821 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
822 {
823 text_length = 0;
824 #ifdef PNG_iTXt_SUPPORTED
825 if(text_ptr[i].compression > 0)
826 textp->compression = PNG_ITXT_COMPRESSION_NONE;
827 else
828 #endif
829 textp->compression = PNG_TEXT_COMPRESSION_NONE;
830 }
831 else
832 {
833 text_length = png_strlen(text_ptr[i].text);
834 textp->compression = text_ptr[i].compression;
835 }
836
837 textp->key = (png_charp)png_malloc_warn(png_ptr,
838 (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
839 if (textp->key == NULL)
840 return(1);
841 png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
842 (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
843 (int)textp->key);
844
845 png_memcpy(textp->key, text_ptr[i].key,
846 (png_size_t)(key_len));
847 *(textp->key+key_len) = '\0';
848 #ifdef PNG_iTXt_SUPPORTED
849 if (text_ptr[i].compression > 0)
850 {
851 textp->lang=textp->key + key_len + 1;
852 png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
853 *(textp->lang+lang_len) = '\0';
854 textp->lang_key=textp->lang + lang_len + 1;
855 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
856 *(textp->lang_key+lang_key_len) = '\0';
857 textp->text=textp->lang_key + lang_key_len + 1;
858 }
859 else
860 #endif
861 {
862 #ifdef PNG_iTXt_SUPPORTED
863 textp->lang=NULL;
864 textp->lang_key=NULL;
865 #endif
866 textp->text=textp->key + key_len + 1;
867 }
868 if(text_length)
869 png_memcpy(textp->text, text_ptr[i].text,
870 (png_size_t)(text_length));
871 *(textp->text+text_length) = '\0';
872
873 #ifdef PNG_iTXt_SUPPORTED
874 if(textp->compression > 0)
875 {
876 textp->text_length = 0;
877 textp->itxt_length = text_length;
878 }
879 else
880 #endif
881 {
882 textp->text_length = text_length;
883 #ifdef PNG_iTXt_SUPPORTED
884 textp->itxt_length = 0;
885 #endif
886 }
887 info_ptr->num_text++;
888 png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
889 }
890 return(0);
891 }
892 #endif
893
894 #if defined(PNG_tIME_SUPPORTED)
895 void PNGAPI
896 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
897 {
898 png_debug1(1, "in %s storage function\n", "tIME");
899 if (png_ptr == NULL || info_ptr == NULL ||
900 (png_ptr->mode & PNG_WROTE_tIME))
901 return;
902
903 png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof (png_time));
904 info_ptr->valid |= PNG_INFO_tIME;
905 }
906 #endif
907
908 #if defined(PNG_tRNS_SUPPORTED)
909 void PNGAPI
910 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
911 png_bytep trans, int num_trans, png_color_16p trans_values)
912 {
913 png_debug1(1, "in %s storage function\n", "tRNS");
914 if (png_ptr == NULL || info_ptr == NULL)
915 return;
916
917 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
918
919 if (trans != NULL)
920 {
921 /*
922 * It may not actually be necessary to set png_ptr->trans here;
923 * we do it for backward compatibility with the way the png_handle_tRNS
924 * function used to do the allocation.
925 */
926
927 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
928 png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
929 (png_uint_32)PNG_MAX_PALETTE_LENGTH);
930 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
931 png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
932 }
933
934 if (trans_values != NULL)
935 {
936 int sample_max = (1 << info_ptr->bit_depth);
937 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
938 (int)trans_values->gray > sample_max) ||
939 (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
940 ((int)trans_values->red > sample_max ||
941 (int)trans_values->green > sample_max ||
942 (int)trans_values->blue > sample_max)))
943 png_warning(png_ptr,
944 "tRNS chunk has out-of-range samples for bit_depth");
945 png_memcpy(&(info_ptr->trans_values), trans_values,
946 png_sizeof(png_color_16));
947 if (num_trans == 0)
948 num_trans = 1;
949 }
950
951 info_ptr->num_trans = (png_uint_16)num_trans;
952 if (num_trans != 0)
953 {
954 info_ptr->valid |= PNG_INFO_tRNS;
955 #ifdef PNG_FREE_ME_SUPPORTED
956 info_ptr->free_me |= PNG_FREE_TRNS;
957 #else
958 png_ptr->flags |= PNG_FLAG_FREE_TRNS;
959 #endif
960 }
961 }
962 #endif
963
964 #if defined(PNG_sPLT_SUPPORTED)
965 void PNGAPI
966 png_set_sPLT(png_structp png_ptr,
967 png_infop info_ptr, png_sPLT_tp entries, int nentries)
968 {
969 png_sPLT_tp np;
970 int i;
971
972 if (png_ptr == NULL || info_ptr == NULL)
973 return;
974
975 np = (png_sPLT_tp)png_malloc_warn(png_ptr,
976 (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t));
977 if (np == NULL)
978 {
979 png_warning(png_ptr, "No memory for sPLT palettes.");
980 return;
981 }
982
983 png_memcpy(np, info_ptr->splt_palettes,
984 info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
985 png_free(png_ptr, info_ptr->splt_palettes);
986 info_ptr->splt_palettes=NULL;
987
988 for (i = 0; i < nentries; i++)
989 {
990 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
991 png_sPLT_tp from = entries + i;
992 png_uint_32 length;
993
994 length = png_strlen(from->name) + 1;
995 to->name = (png_charp)png_malloc_warn(png_ptr, length);
996 if (to->name == NULL)
997 {
998 png_warning(png_ptr,
999 "Out of memory while processing sPLT chunk");
1000 continue;
1001 }
1002 png_memcpy(to->name, from->name, length);
1003 to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
1004 from->nentries * png_sizeof(png_sPLT_entry));
1005 if (to->entries == NULL)
1006 {
1007 png_warning(png_ptr,
1008 "Out of memory while processing sPLT chunk");
1009 png_free(png_ptr,to->name);
1010 to->name = NULL;
1011 continue;
1012 }
1013 png_memcpy(to->entries, from->entries,
1014 from->nentries * png_sizeof(png_sPLT_entry));
1015 to->nentries = from->nentries;
1016 to->depth = from->depth;
1017 }
1018
1019 info_ptr->splt_palettes = np;
1020 info_ptr->splt_palettes_num += nentries;
1021 info_ptr->valid |= PNG_INFO_sPLT;
1022 #ifdef PNG_FREE_ME_SUPPORTED
1023 info_ptr->free_me |= PNG_FREE_SPLT;
1024 #endif
1025 }
1026 #endif /* PNG_sPLT_SUPPORTED */
1027
1028 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1029 void PNGAPI
1030 png_set_unknown_chunks(png_structp png_ptr,
1031 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
1032 {
1033 png_unknown_chunkp np;
1034 int i;
1035
1036 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
1037 return;
1038
1039 np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
1040 (info_ptr->unknown_chunks_num + num_unknowns) *
1041 png_sizeof(png_unknown_chunk));
1042 if (np == NULL)
1043 {
1044 png_warning(png_ptr,
1045 "Out of memory while processing unknown chunk.");
1046 return;
1047 }
1048
1049 png_memcpy(np, info_ptr->unknown_chunks,
1050 info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
1051 png_free(png_ptr, info_ptr->unknown_chunks);
1052 info_ptr->unknown_chunks=NULL;
1053
1054 for (i = 0; i < num_unknowns; i++)
1055 {
1056 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
1057 png_unknown_chunkp from = unknowns + i;
1058
1059 png_memcpy((png_charp)to->name,
1060 (png_charp)from->name,
1061 png_sizeof(from->name));
1062 to->name[png_sizeof(to->name)-1] = '\0';
1063 to->size = from->size;
1064 /* note our location in the read or write sequence */
1065 to->location = (png_byte)(png_ptr->mode & 0xff);
1066
1067 if (from->size == 0)
1068 to->data=NULL;
1069 else
1070 {
1071 to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
1072 if (to->data == NULL)
1073 {
1074 png_warning(png_ptr,
1075 "Out of memory while processing unknown chunk.");
1076 to->size=0;
1077 }
1078 else
1079 png_memcpy(to->data, from->data, from->size);
1080 }
1081 }
1082
1083 info_ptr->unknown_chunks = np;
1084 info_ptr->unknown_chunks_num += num_unknowns;
1085 #ifdef PNG_FREE_ME_SUPPORTED
1086 info_ptr->free_me |= PNG_FREE_UNKN;
1087 #endif
1088 }
1089 void PNGAPI
1090 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
1091 int chunk, int location)
1092 {
1093 if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
1094 (int)info_ptr->unknown_chunks_num)
1095 info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1096 }
1097 #endif
1098
1099 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
1100 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1101 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1102 void PNGAPI
1103 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
1104 {
1105 /* This function is deprecated in favor of png_permit_mng_features()
1106 and will be removed from libpng-1.3.0 */
1107 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
1108 if (png_ptr == NULL)
1109 return;
1110 png_ptr->mng_features_permitted = (png_byte)
1111 ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) |
1112 ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
1113 }
1114 #endif
1115 #endif
1116
1117 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1118 png_uint_32 PNGAPI
1119 png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1120 {
1121 png_debug(1, "in png_permit_mng_features\n");
1122 if (png_ptr == NULL)
1123 return (png_uint_32)0;
1124 png_ptr->mng_features_permitted =
1125 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1126 return (png_uint_32)png_ptr->mng_features_permitted;
1127 }
1128 #endif
1129
1130 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1131 void PNGAPI
1132 png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1133 chunk_list, int num_chunks)
1134 {
1135 png_bytep new_list, p;
1136 int i, old_num_chunks;
1137 if (png_ptr == NULL)
1138 return;
1139 if (num_chunks == 0)
1140 {
1141 if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
1142 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1143 else
1144 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1145
1146 if(keep == PNG_HANDLE_CHUNK_ALWAYS)
1147 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1148 else
1149 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1150 return;
1151 }
1152 if (chunk_list == NULL)
1153 return;
1154 old_num_chunks=png_ptr->num_chunk_list;
1155 new_list=(png_bytep)png_malloc(png_ptr,
1156 (png_uint_32)(5*(num_chunks+old_num_chunks)));
1157 if(png_ptr->chunk_list != NULL)
1158 {
1159 png_memcpy(new_list, png_ptr->chunk_list,
1160 (png_size_t)(5*old_num_chunks));
1161 png_free(png_ptr, png_ptr->chunk_list);
1162 png_ptr->chunk_list=NULL;
1163 }
1164 png_memcpy(new_list+5*old_num_chunks, chunk_list,
1165 (png_size_t)(5*num_chunks));
1166 for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
1167 *p=(png_byte)keep;
1168 png_ptr->num_chunk_list=old_num_chunks+num_chunks;
1169 png_ptr->chunk_list=new_list;
1170 #ifdef PNG_FREE_ME_SUPPORTED
1171 png_ptr->free_me |= PNG_FREE_LIST;
1172 #endif
1173 }
1174 #endif
1175
1176 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1177 void PNGAPI
1178 png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1179 png_user_chunk_ptr read_user_chunk_fn)
1180 {
1181 png_debug(1, "in png_set_read_user_chunk_fn\n");
1182 if (png_ptr == NULL)
1183 return;
1184 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1185 png_ptr->user_chunk_ptr = user_chunk_ptr;
1186 }
1187 #endif
1188
1189 #if defined(PNG_INFO_IMAGE_SUPPORTED)
1190 void PNGAPI
1191 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1192 {
1193 png_debug1(1, "in %s storage function\n", "rows");
1194
1195 if (png_ptr == NULL || info_ptr == NULL)
1196 return;
1197
1198 if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1199 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1200 info_ptr->row_pointers = row_pointers;
1201 if(row_pointers)
1202 info_ptr->valid |= PNG_INFO_IDAT;
1203 }
1204 #endif
1205
1206 #ifdef PNG_WRITE_SUPPORTED
1207 void PNGAPI
1208 png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
1209 {
1210 if (png_ptr == NULL)
1211 return;
1212 png_free(png_ptr, png_ptr->zbuf);
1213 png_ptr->zbuf_size = (png_size_t)size;
1214 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1215 png_ptr->zstream.next_out = png_ptr->zbuf;
1216 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1217 }
1218 #endif
1219
1220 void PNGAPI
1221 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1222 {
1223 if (png_ptr && info_ptr)
1224 info_ptr->valid &= ~mask;
1225 }
1226
1227
1228 #ifndef PNG_1_0_X
1229 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1230 /* function was added to libpng 1.2.0 and should always exist by default */
1231 void PNGAPI
1232 png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1233 {
1234 /* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1235 if (png_ptr != NULL)
1236 png_ptr->asm_flags = 0;
1237 }
1238
1239 /* this function was added to libpng 1.2.0 */
1240 void PNGAPI
1241 png_set_mmx_thresholds (png_structp png_ptr,
1242 png_byte mmx_bitdepth_threshold,
1243 png_uint_32 mmx_rowbytes_threshold)
1244 {
1245 /* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1246 if (png_ptr == NULL)
1247 return;
1248 }
1249 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1250
1251 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1252 /* this function was added to libpng 1.2.6 */
1253 void PNGAPI
1254 png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
1255 png_uint_32 user_height_max)
1256 {
1257 /* Images with dimensions larger than these limits will be
1258 * rejected by png_set_IHDR(). To accept any PNG datastream
1259 * regardless of dimensions, set both limits to 0x7ffffffL.
1260 */
1261 if(png_ptr == NULL) return;
1262 png_ptr->user_width_max = user_width_max;
1263 png_ptr->user_height_max = user_height_max;
1264 }
1265 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1266
1267 #endif /* ?PNG_1_0_X */
1268 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */