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source: trunk/src/3rdparty/libpng/pngset.c@ 686

Last change on this file since 686 was 561, checked in by Dmitry A. Kuminov, 16 years ago
trunk: Merged in qt 4.6.1 sources.
File size: 38.4 KB

Line
1
2	/* pngset.c - storage of image information into info struct
3	*
4	* Last changed in libpng 1.2.40 [September 10, 2009]
5	* Copyright (c) 1998-2009 Glenn Randers-Pehrson
6	* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7	* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8	*
9	* This code is released under the libpng license.
10	* For conditions of distribution and use, see the disclaimer
11	* and license in png.h
12	*
13	* The functions here are used during reads to store data from the file
14	* into the info struct, and during writes to store application data
15	* into the info struct for writing into the file. This abstracts the
16	* info struct and allows us to change the structure in the future.
17	*/
18
19	#define PNG_INTERNAL
20	#include "png.h"
21	#if defined(PNG_READ_SUPPORTED) \|\| defined(PNG_WRITE_SUPPORTED)
22
23	#if defined(PNG_bKGD_SUPPORTED)
24	void PNGAPI
25	png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
26	{
27	png_debug1(1, "in %s storage function", "bKGD");
28
29	if (png_ptr == NULL \|\| info_ptr == NULL)
30	return;
31
32	png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
33	info_ptr->valid \|= PNG_INFO_bKGD;
34	}
35	#endif
36
37	#if defined(PNG_cHRM_SUPPORTED)
38	#ifdef PNG_FLOATING_POINT_SUPPORTED
39	void PNGAPI
40	png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
41	double white_x, double white_y, double red_x, double red_y,
42	double green_x, double green_y, double blue_x, double blue_y)
43	{
44	png_debug1(1, "in %s storage function", "cHRM");
45
46	if (png_ptr == NULL \|\| info_ptr == NULL)
47	return;
48
49	info_ptr->x_white = (float)white_x;
50	info_ptr->y_white = (float)white_y;
51	info_ptr->x_red = (float)red_x;
52	info_ptr->y_red = (float)red_y;
53	info_ptr->x_green = (float)green_x;
54	info_ptr->y_green = (float)green_y;
55	info_ptr->x_blue = (float)blue_x;
56	info_ptr->y_blue = (float)blue_y;
57	#ifdef PNG_FIXED_POINT_SUPPORTED
58	info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
59	info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
60	info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5);
61	info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5);
62	info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
63	info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
64	info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5);
65	info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5);
66	#endif
67	info_ptr->valid \|= PNG_INFO_cHRM;
68	}
69	#endif /* PNG_FLOATING_POINT_SUPPORTED */
70
71	#ifdef PNG_FIXED_POINT_SUPPORTED
72	void PNGAPI
73	png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
74	png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
75	png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
76	png_fixed_point blue_x, png_fixed_point blue_y)
77	{
78	png_debug1(1, "in %s storage function", "cHRM fixed");
79
80	if (png_ptr == NULL \|\| info_ptr == NULL)
81	return;
82
83	#if !defined(PNG_NO_CHECK_cHRM)
84	if (png_check_cHRM_fixed(png_ptr,
85	white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
86	#endif
87	{
88	info_ptr->int_x_white = white_x;
89	info_ptr->int_y_white = white_y;
90	info_ptr->int_x_red = red_x;
91	info_ptr->int_y_red = red_y;
92	info_ptr->int_x_green = green_x;
93	info_ptr->int_y_green = green_y;
94	info_ptr->int_x_blue = blue_x;
95	info_ptr->int_y_blue = blue_y;
96	#ifdef PNG_FLOATING_POINT_SUPPORTED
97	info_ptr->x_white = (float)(white_x/100000.);
98	info_ptr->y_white = (float)(white_y/100000.);
99	info_ptr->x_red = (float)( red_x/100000.);
100	info_ptr->y_red = (float)( red_y/100000.);
101	info_ptr->x_green = (float)(green_x/100000.);
102	info_ptr->y_green = (float)(green_y/100000.);
103	info_ptr->x_blue = (float)( blue_x/100000.);
104	info_ptr->y_blue = (float)( blue_y/100000.);
105	#endif
106	info_ptr->valid \|= PNG_INFO_cHRM;
107	}
108	}
109	#endif /* PNG_FIXED_POINT_SUPPORTED */
110	#endif /* PNG_cHRM_SUPPORTED */
111
112	#if defined(PNG_gAMA_SUPPORTED)
113	#ifdef PNG_FLOATING_POINT_SUPPORTED
114	void PNGAPI
115	png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
116	{
117	double png_gamma;
118
119	png_debug1(1, "in %s storage function", "gAMA");
120
121	if (png_ptr == NULL \|\| info_ptr == NULL)
122	return;
123
124	/* Check for overflow */
125	if (file_gamma > 21474.83)
126	{
127	png_warning(png_ptr, "Limiting gamma to 21474.83");
128	png_gamma=21474.83;
129	}
130	else
131	png_gamma = file_gamma;
132	info_ptr->gamma = (float)png_gamma;
133	#ifdef PNG_FIXED_POINT_SUPPORTED
134	info_ptr->int_gamma = (int)(png_gamma*100000.+.5);
135	#endif
136	info_ptr->valid \|= PNG_INFO_gAMA;
137	if (png_gamma == 0.0)
138	png_warning(png_ptr, "Setting gamma=0");
139	}
140	#endif
141	void PNGAPI
142	png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
143	int_gamma)
144	{
145	png_fixed_point png_gamma;
146
147	png_debug1(1, "in %s storage function", "gAMA");
148
149	if (png_ptr == NULL \|\| info_ptr == NULL)
150	return;
151
152	if (int_gamma > (png_fixed_point)PNG_UINT_31_MAX)
153	{
154	png_warning(png_ptr, "Limiting gamma to 21474.83");
155	png_gamma=PNG_UINT_31_MAX;
156	}
157	else
158	{
159	if (int_gamma < 0)
160	{
161	png_warning(png_ptr, "Setting negative gamma to zero");
162	png_gamma = 0;
163	}
164	else
165	png_gamma = int_gamma;
166	}
167	#ifdef PNG_FLOATING_POINT_SUPPORTED
168	info_ptr->gamma = (float)(png_gamma/100000.);
169	#endif
170	#ifdef PNG_FIXED_POINT_SUPPORTED
171	info_ptr->int_gamma = png_gamma;
172	#endif
173	info_ptr->valid \|= PNG_INFO_gAMA;
174	if (png_gamma == 0)
175	png_warning(png_ptr, "Setting gamma=0");
176	}
177	#endif
178
179	#if defined(PNG_hIST_SUPPORTED)
180	void PNGAPI
181	png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
182	{
183	int i;
184
185	png_debug1(1, "in %s storage function", "hIST");
186
187	if (png_ptr == NULL \|\| info_ptr == NULL)
188	return;
189
190	if (info_ptr->num_palette == 0 \|\| info_ptr->num_palette
191	> PNG_MAX_PALETTE_LENGTH)
192	{
193	png_warning(png_ptr,
194	"Invalid palette size, hIST allocation skipped.");
195	return;
196	}
197
198	#ifdef PNG_FREE_ME_SUPPORTED
199	png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
200	#endif
201	/* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
202	* version 1.2.1
203	*/
204	png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
205	(png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));
206	if (png_ptr->hist == NULL)
207	{
208	png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
209	return;
210	}
211
212	for (i = 0; i < info_ptr->num_palette; i++)
213	png_ptr->hist[i] = hist[i];
214	info_ptr->hist = png_ptr->hist;
215	info_ptr->valid \|= PNG_INFO_hIST;
216
217	#ifdef PNG_FREE_ME_SUPPORTED
218	info_ptr->free_me \|= PNG_FREE_HIST;
219	#else
220	png_ptr->flags \|= PNG_FLAG_FREE_HIST;
221	#endif
222	}
223	#endif
224
225	void PNGAPI
226	png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
227	png_uint_32 width, png_uint_32 height, int bit_depth,
228	int color_type, int interlace_type, int compression_type,
229	int filter_type)
230	{
231	png_debug1(1, "in %s storage function", "IHDR");
232
233	if (png_ptr == NULL \|\| info_ptr == NULL)
234	return;
235
236	/* Check for width and height valid values */
237	if (width == 0 \|\| height == 0)
238	png_error(png_ptr, "Image width or height is zero in IHDR");
239	#ifdef PNG_SET_USER_LIMITS_SUPPORTED
240	if (width > png_ptr->user_width_max \|\| height > png_ptr->user_height_max)
241	png_error(png_ptr, "image size exceeds user limits in IHDR");
242	#else
243	if (width > PNG_USER_WIDTH_MAX \|\| height > PNG_USER_HEIGHT_MAX)
244	png_error(png_ptr, "image size exceeds user limits in IHDR");
245	#endif
246	if (width > PNG_UINT_31_MAX \|\| height > PNG_UINT_31_MAX)
247	png_error(png_ptr, "Invalid image size in IHDR");
248	if ( width > (PNG_UINT_32_MAX
249	>> 3) /* 8-byte RGBA pixels */
250	- 64 /* bigrowbuf hack */
251	- 1 /* filter byte */
252	- 78 / rounding of width to multiple of 8 pixels */
253	- 8) /* extra max_pixel_depth pad */
254	png_warning(png_ptr, "Width is too large for libpng to process pixels");
255
256	/* Check other values */
257	if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
258	bit_depth != 8 && bit_depth != 16)
259	png_error(png_ptr, "Invalid bit depth in IHDR");
260
261	if (color_type < 0 \|\| color_type == 1 \|\|
262	color_type == 5 \|\| color_type > 6)
263	png_error(png_ptr, "Invalid color type in IHDR");
264
265	if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) \|\|
266	((color_type == PNG_COLOR_TYPE_RGB \|\|
267	color_type == PNG_COLOR_TYPE_GRAY_ALPHA \|\|
268	color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
269	png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
270
271	if (interlace_type >= PNG_INTERLACE_LAST)
272	png_error(png_ptr, "Unknown interlace method in IHDR");
273
274	if (compression_type != PNG_COMPRESSION_TYPE_BASE)
275	png_error(png_ptr, "Unknown compression method in IHDR");
276
277	#if defined(PNG_MNG_FEATURES_SUPPORTED)
278	/* Accept filter_method 64 (intrapixel differencing) only if
279	* 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
280	* 2. Libpng did not read a PNG signature (this filter_method is only
281	* used in PNG datastreams that are embedded in MNG datastreams) and
282	* 3. The application called png_permit_mng_features with a mask that
283	* included PNG_FLAG_MNG_FILTER_64 and
284	* 4. The filter_method is 64 and
285	* 5. The color_type is RGB or RGBA
286	*/
287	if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
288	png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
289	if (filter_type != PNG_FILTER_TYPE_BASE)
290	{
291	if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
292	(filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
293	((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
294	(color_type == PNG_COLOR_TYPE_RGB \|\|
295	color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
296	png_error(png_ptr, "Unknown filter method in IHDR");
297	if (png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
298	png_warning(png_ptr, "Invalid filter method in IHDR");
299	}
300	#else
301	if (filter_type != PNG_FILTER_TYPE_BASE)
302	png_error(png_ptr, "Unknown filter method in IHDR");
303	#endif
304
305	info_ptr->width = width;
306	info_ptr->height = height;
307	info_ptr->bit_depth = (png_byte)bit_depth;
308	info_ptr->color_type =(png_byte) color_type;
309	info_ptr->compression_type = (png_byte)compression_type;
310	info_ptr->filter_type = (png_byte)filter_type;
311	info_ptr->interlace_type = (png_byte)interlace_type;
312	if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
313	info_ptr->channels = 1;
314	else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
315	info_ptr->channels = 3;
316	else
317	info_ptr->channels = 1;
318	if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
319	info_ptr->channels++;
320	info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
321
322	/* Check for potential overflow */
323	if (width > (PNG_UINT_32_MAX
324	>> 3) /* 8-byte RGBA pixels */
325	- 64 /* bigrowbuf hack */
326	- 1 /* filter byte */
327	- 78 / rounding of width to multiple of 8 pixels */
328	- 8) /* extra max_pixel_depth pad */
329	info_ptr->rowbytes = (png_size_t)0;
330	else
331	info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
332	}
333
334	#if defined(PNG_oFFs_SUPPORTED)
335	void PNGAPI
336	png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
337	png_int_32 offset_x, png_int_32 offset_y, int unit_type)
338	{
339	png_debug1(1, "in %s storage function", "oFFs");
340
341	if (png_ptr == NULL \|\| info_ptr == NULL)
342	return;
343
344	info_ptr->x_offset = offset_x;
345	info_ptr->y_offset = offset_y;
346	info_ptr->offset_unit_type = (png_byte)unit_type;
347	info_ptr->valid \|= PNG_INFO_oFFs;
348	}
349	#endif
350
351	#if defined(PNG_pCAL_SUPPORTED)
352	void PNGAPI
353	png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
354	png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
355	png_charp units, png_charpp params)
356	{
357	png_uint_32 length;
358	int i;
359
360	png_debug1(1, "in %s storage function", "pCAL");
361
362	if (png_ptr == NULL \|\| info_ptr == NULL)
363	return;
364
365	length = png_strlen(purpose) + 1;
366	png_debug1(3, "allocating purpose for info (%lu bytes)",
367	(unsigned long)length);
368	info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
369	if (info_ptr->pcal_purpose == NULL)
370	{
371	png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
372	return;
373	}
374	png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
375
376	png_debug(3, "storing X0, X1, type, and nparams in info");
377	info_ptr->pcal_X0 = X0;
378	info_ptr->pcal_X1 = X1;
379	info_ptr->pcal_type = (png_byte)type;
380	info_ptr->pcal_nparams = (png_byte)nparams;
381
382	length = png_strlen(units) + 1;
383	png_debug1(3, "allocating units for info (%lu bytes)",
384	(unsigned long)length);
385	info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
386	if (info_ptr->pcal_units == NULL)
387	{
388	png_warning(png_ptr, "Insufficient memory for pCAL units.");
389	return;
390	}
391	png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
392
393	info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
394	(png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
395	if (info_ptr->pcal_params == NULL)
396	{
397	png_warning(png_ptr, "Insufficient memory for pCAL params.");
398	return;
399	}
400
401	png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));
402
403	for (i = 0; i < nparams; i++)
404	{
405	length = png_strlen(params[i]) + 1;
406	png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
407	(unsigned long)length);
408	info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
409	if (info_ptr->pcal_params[i] == NULL)
410	{
411	png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
412	return;
413	}
414	png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
415	}
416
417	info_ptr->valid \|= PNG_INFO_pCAL;
418	#ifdef PNG_FREE_ME_SUPPORTED
419	info_ptr->free_me \|= PNG_FREE_PCAL;
420	#endif
421	}
422	#endif
423
424	#if defined(PNG_READ_sCAL_SUPPORTED) \|\| defined(PNG_WRITE_sCAL_SUPPORTED)
425	#ifdef PNG_FLOATING_POINT_SUPPORTED
426	void PNGAPI
427	png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
428	int unit, double width, double height)
429	{
430	png_debug1(1, "in %s storage function", "sCAL");
431
432	if (png_ptr == NULL \|\| info_ptr == NULL)
433	return;
434
435	info_ptr->scal_unit = (png_byte)unit;
436	info_ptr->scal_pixel_width = width;
437	info_ptr->scal_pixel_height = height;
438
439	info_ptr->valid \|= PNG_INFO_sCAL;
440	}
441	#else
442	#ifdef PNG_FIXED_POINT_SUPPORTED
443	void PNGAPI
444	png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
445	int unit, png_charp swidth, png_charp sheight)
446	{
447	png_uint_32 length;
448
449	png_debug1(1, "in %s storage function", "sCAL");
450
451	if (png_ptr == NULL \|\| info_ptr == NULL)
452	return;
453
454	info_ptr->scal_unit = (png_byte)unit;
455
456	length = png_strlen(swidth) + 1;
457	png_debug1(3, "allocating unit for info (%u bytes)",
458	(unsigned int)length);
459	info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
460	if (info_ptr->scal_s_width == NULL)
461	{
462	png_warning(png_ptr,
463	"Memory allocation failed while processing sCAL.");
464	return;
465	}
466	png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
467
468	length = png_strlen(sheight) + 1;
469	png_debug1(3, "allocating unit for info (%u bytes)",
470	(unsigned int)length);
471	info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
472	if (info_ptr->scal_s_height == NULL)
473	{
474	png_free (png_ptr, info_ptr->scal_s_width);
475	info_ptr->scal_s_width = NULL;
476	png_warning(png_ptr,
477	"Memory allocation failed while processing sCAL.");
478	return;
479	}
480	png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
481	info_ptr->valid \|= PNG_INFO_sCAL;
482	#ifdef PNG_FREE_ME_SUPPORTED
483	info_ptr->free_me \|= PNG_FREE_SCAL;
484	#endif
485	}
486	#endif
487	#endif
488	#endif
489
490	#if defined(PNG_pHYs_SUPPORTED)
491	void PNGAPI
492	png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
493	png_uint_32 res_x, png_uint_32 res_y, int unit_type)
494	{
495	png_debug1(1, "in %s storage function", "pHYs");
496
497	if (png_ptr == NULL \|\| info_ptr == NULL)
498	return;
499
500	info_ptr->x_pixels_per_unit = res_x;
501	info_ptr->y_pixels_per_unit = res_y;
502	info_ptr->phys_unit_type = (png_byte)unit_type;
503	info_ptr->valid \|= PNG_INFO_pHYs;
504	}
505	#endif
506
507	void PNGAPI
508	png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
509	png_colorp palette, int num_palette)
510	{
511
512	png_debug1(1, "in %s storage function", "PLTE");
513
514	if (png_ptr == NULL \|\| info_ptr == NULL)
515	return;
516
517	if (num_palette < 0 \|\| num_palette > PNG_MAX_PALETTE_LENGTH)
518	{
519	if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
520	png_error(png_ptr, "Invalid palette length");
521	else
522	{
523	png_warning(png_ptr, "Invalid palette length");
524	return;
525	}
526	}
527
528	/*
529	* It may not actually be necessary to set png_ptr->palette here;
530	* we do it for backward compatibility with the way the png_handle_tRNS
531	* function used to do the allocation.
532	*/
533	#ifdef PNG_FREE_ME_SUPPORTED
534	png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
535	#endif
536
537	/* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
538	* of num_palette entries, in case of an invalid PNG file that has
539	* too-large sample values.
540	*/
541	png_ptr->palette = (png_colorp)png_malloc(png_ptr,
542	PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
543	png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
544	png_sizeof(png_color));
545	png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
546	info_ptr->palette = png_ptr->palette;
547	info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
548
549	#ifdef PNG_FREE_ME_SUPPORTED
550	info_ptr->free_me \|= PNG_FREE_PLTE;
551	#else
552	png_ptr->flags \|= PNG_FLAG_FREE_PLTE;
553	#endif
554
555	info_ptr->valid \|= PNG_INFO_PLTE;
556	}
557
558	#if defined(PNG_sBIT_SUPPORTED)
559	void PNGAPI
560	png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
561	png_color_8p sig_bit)
562	{
563	png_debug1(1, "in %s storage function", "sBIT");
564
565	if (png_ptr == NULL \|\| info_ptr == NULL)
566	return;
567
568	png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
569	info_ptr->valid \|= PNG_INFO_sBIT;
570	}
571	#endif
572
573	#if defined(PNG_sRGB_SUPPORTED)
574	void PNGAPI
575	png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
576	{
577	png_debug1(1, "in %s storage function", "sRGB");
578
579	if (png_ptr == NULL \|\| info_ptr == NULL)
580	return;
581
582	info_ptr->srgb_intent = (png_byte)intent;
583	info_ptr->valid \|= PNG_INFO_sRGB;
584	}
585
586	void PNGAPI
587	png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
588	int intent)
589	{
590	#if defined(PNG_gAMA_SUPPORTED)
591	#ifdef PNG_FLOATING_POINT_SUPPORTED
592	float file_gamma;
593	#endif
594	#ifdef PNG_FIXED_POINT_SUPPORTED
595	png_fixed_point int_file_gamma;
596	#endif
597	#endif
598	#if defined(PNG_cHRM_SUPPORTED)
599	#ifdef PNG_FLOATING_POINT_SUPPORTED
600	float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
601	#endif
602	png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
603	int_green_y, int_blue_x, int_blue_y;
604	#endif
605	png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
606
607	if (png_ptr == NULL \|\| info_ptr == NULL)
608	return;
609
610	png_set_sRGB(png_ptr, info_ptr, intent);
611
612	#if defined(PNG_gAMA_SUPPORTED)
613	#ifdef PNG_FLOATING_POINT_SUPPORTED
614	file_gamma = (float).45455;
615	png_set_gAMA(png_ptr, info_ptr, file_gamma);
616	#endif
617	#ifdef PNG_FIXED_POINT_SUPPORTED
618	int_file_gamma = 45455L;
619	png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
620	#endif
621	#endif
622
623	#if defined(PNG_cHRM_SUPPORTED)
624	int_white_x = 31270L;
625	int_white_y = 32900L;
626	int_red_x = 64000L;
627	int_red_y = 33000L;
628	int_green_x = 30000L;
629	int_green_y = 60000L;
630	int_blue_x = 15000L;
631	int_blue_y = 6000L;
632
633	#ifdef PNG_FLOATING_POINT_SUPPORTED
634	white_x = (float).3127;
635	white_y = (float).3290;
636	red_x = (float).64;
637	red_y = (float).33;
638	green_x = (float).30;
639	green_y = (float).60;
640	blue_x = (float).15;
641	blue_y = (float).06;
642	#endif
643
644	#if !defined(PNG_NO_CHECK_cHRM)
645	if (png_check_cHRM_fixed(png_ptr,
646	int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
647	int_green_y, int_blue_x, int_blue_y))
648	#endif
649	{
650	#ifdef PNG_FIXED_POINT_SUPPORTED
651	png_set_cHRM_fixed(png_ptr, info_ptr,
652	int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
653	int_green_y, int_blue_x, int_blue_y);
654	#endif
655	#ifdef PNG_FLOATING_POINT_SUPPORTED
656	png_set_cHRM(png_ptr, info_ptr,
657	white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
658	#endif
659	}
660	#endif /* cHRM */
661	}
662	#endif /* sRGB */
663
664
665	#if defined(PNG_iCCP_SUPPORTED)
666	void PNGAPI
667	png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
668	png_charp name, int compression_type,
669	png_charp profile, png_uint_32 proflen)
670	{
671	png_charp new_iccp_name;
672	png_charp new_iccp_profile;
673	png_uint_32 length;
674
675	png_debug1(1, "in %s storage function", "iCCP");
676
677	if (png_ptr == NULL \|\| info_ptr == NULL \|\| name == NULL \|\| profile == NULL)
678	return;
679
680	length = png_strlen(name)+1;
681	new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
682	if (new_iccp_name == NULL)
683	{
684	png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
685	return;
686	}
687	png_memcpy(new_iccp_name, name, length);
688	new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
689	if (new_iccp_profile == NULL)
690	{
691	png_free (png_ptr, new_iccp_name);
692	png_warning(png_ptr,
693	"Insufficient memory to process iCCP profile.");
694	return;
695	}
696	png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
697
698	png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
699
700	info_ptr->iccp_proflen = proflen;
701	info_ptr->iccp_name = new_iccp_name;
702	info_ptr->iccp_profile = new_iccp_profile;
703	/* Compression is always zero but is here so the API and info structure
704	* does not have to change if we introduce multiple compression types */
705	info_ptr->iccp_compression = (png_byte)compression_type;
706	#ifdef PNG_FREE_ME_SUPPORTED
707	info_ptr->free_me \|= PNG_FREE_ICCP;
708	#endif
709	info_ptr->valid \|= PNG_INFO_iCCP;
710	}
711	#endif
712
713	#if defined(PNG_TEXT_SUPPORTED)
714	void PNGAPI
715	png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
716	int num_text)
717	{
718	int ret;
719	ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
720	if (ret)
721	png_error(png_ptr, "Insufficient memory to store text");
722	}
723
724	int /* PRIVATE */
725	png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
726	int num_text)
727	{
728	int i;
729
730	png_debug1(1, "in %s storage function", ((png_ptr == NULL \|\|
731	png_ptr->chunk_name[0] == '\0') ?
732	"text" : (png_const_charp)png_ptr->chunk_name));
733
734	if (png_ptr == NULL \|\| info_ptr == NULL \|\| num_text == 0)
735	return(0);
736
737	/* Make sure we have enough space in the "text" array in info_struct
738	* to hold all of the incoming text_ptr objects.
739	*/
740	if (info_ptr->num_text + num_text > info_ptr->max_text)
741	{
742	if (info_ptr->text != NULL)
743	{
744	png_textp old_text;
745	int old_max;
746
747	old_max = info_ptr->max_text;
748	info_ptr->max_text = info_ptr->num_text + num_text + 8;
749	old_text = info_ptr->text;
750	info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
751	(png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
752	if (info_ptr->text == NULL)
753	{
754	png_free(png_ptr, old_text);
755	return(1);
756	}
757	png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
758	png_sizeof(png_text)));
759	png_free(png_ptr, old_text);
760	}
761	else
762	{
763	info_ptr->max_text = num_text + 8;
764	info_ptr->num_text = 0;
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	return(1);
769	#ifdef PNG_FREE_ME_SUPPORTED
770	info_ptr->free_me \|= PNG_FREE_TEXT;
771	#endif
772	}
773	png_debug1(3, "allocated %d entries for info_ptr->text",
774	info_ptr->max_text);
775	}
776	for (i = 0; i < num_text; i++)
777	{
778	png_size_t text_length, key_len;
779	png_size_t lang_len, lang_key_len;
780	png_textp textp = &(info_ptr->text[info_ptr->num_text]);
781
782	if (text_ptr[i].key == NULL)
783	continue;
784
785	key_len = png_strlen(text_ptr[i].key);
786
787	if (text_ptr[i].compression <= 0)
788	{
789	lang_len = 0;
790	lang_key_len = 0;
791	}
792	else
793	#ifdef PNG_iTXt_SUPPORTED
794	{
795	/* Set iTXt data */
796	if (text_ptr[i].lang != NULL)
797	lang_len = png_strlen(text_ptr[i].lang);
798	else
799	lang_len = 0;
800	if (text_ptr[i].lang_key != NULL)
801	lang_key_len = png_strlen(text_ptr[i].lang_key);
802	else
803	lang_key_len = 0;
804	}
805	#else
806	{
807	png_warning(png_ptr, "iTXt chunk not supported.");
808	continue;
809	}
810	#endif
811
812	if (text_ptr[i].text == NULL \|\| text_ptr[i].text[0] == '\0')
813	{
814	text_length = 0;
815	#ifdef PNG_iTXt_SUPPORTED
816	if (text_ptr[i].compression > 0)
817	textp->compression = PNG_ITXT_COMPRESSION_NONE;
818	else
819	#endif
820	textp->compression = PNG_TEXT_COMPRESSION_NONE;
821	}
822	else
823	{
824	text_length = png_strlen(text_ptr[i].text);
825	textp->compression = text_ptr[i].compression;
826	}
827
828	textp->key = (png_charp)png_malloc_warn(png_ptr,
829	(png_uint_32)
830	(key_len + text_length + lang_len + lang_key_len + 4));
831	if (textp->key == NULL)
832	return(1);
833	png_debug2(2, "Allocated %lu bytes at %x in png_set_text",
834	(png_uint_32)
835	(key_len + lang_len + lang_key_len + text_length + 4),
836	(int)textp->key);
837
838	png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
839	*(textp->key + key_len) = '\0';
840	#ifdef PNG_iTXt_SUPPORTED
841	if (text_ptr[i].compression > 0)
842	{
843	textp->lang = textp->key + key_len + 1;
844	png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
845	*(textp->lang + lang_len) = '\0';
846	textp->lang_key = textp->lang + lang_len + 1;
847	png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
848	*(textp->lang_key + lang_key_len) = '\0';
849	textp->text = textp->lang_key + lang_key_len + 1;
850	}
851	else
852	#endif
853	{
854	#ifdef PNG_iTXt_SUPPORTED
855	textp->lang=NULL;
856	textp->lang_key=NULL;
857	#endif
858	textp->text = textp->key + key_len + 1;
859	}
860	if (text_length)
861	png_memcpy(textp->text, text_ptr[i].text,
862	(png_size_t)(text_length));
863	*(textp->text + text_length) = '\0';
864
865	#ifdef PNG_iTXt_SUPPORTED
866	if (textp->compression > 0)
867	{
868	textp->text_length = 0;
869	textp->itxt_length = text_length;
870	}
871	else
872	#endif
873	{
874	textp->text_length = text_length;
875	#ifdef PNG_iTXt_SUPPORTED
876	textp->itxt_length = 0;
877	#endif
878	}
879	info_ptr->num_text++;
880	png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
881	}
882	return(0);
883	}
884	#endif
885
886	#if defined(PNG_tIME_SUPPORTED)
887	void PNGAPI
888	png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
889	{
890	png_debug1(1, "in %s storage function", "tIME");
891
892	if (png_ptr == NULL \|\| info_ptr == NULL \|\|
893	(png_ptr->mode & PNG_WROTE_tIME))
894	return;
895
896	png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
897	info_ptr->valid \|= PNG_INFO_tIME;
898	}
899	#endif
900
901	#if defined(PNG_tRNS_SUPPORTED)
902	void PNGAPI
903	png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
904	png_bytep trans, int num_trans, png_color_16p trans_values)
905	{
906	png_debug1(1, "in %s storage function", "tRNS");
907
908	if (png_ptr == NULL \|\| info_ptr == NULL)
909	return;
910
911	if (trans != NULL)
912	{
913	/*
914	* It may not actually be necessary to set png_ptr->trans here;
915	* we do it for backward compatibility with the way the png_handle_tRNS
916	* function used to do the allocation.
917	*/
918
919	#ifdef PNG_FREE_ME_SUPPORTED
920	png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
921	#endif
922
923	/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
924	png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
925	(png_uint_32)PNG_MAX_PALETTE_LENGTH);
926	if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
927	png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
928	}
929
930	if (trans_values != NULL)
931	{
932	int sample_max = (1 << info_ptr->bit_depth);
933	if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
934	(int)trans_values->gray > sample_max) \|\|
935	(info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
936	((int)trans_values->red > sample_max \|\|
937	(int)trans_values->green > sample_max \|\|
938	(int)trans_values->blue > sample_max)))
939	png_warning(png_ptr,
940	"tRNS chunk has out-of-range samples for bit_depth");
941	png_memcpy(&(info_ptr->trans_values), trans_values,
942	png_sizeof(png_color_16));
943	if (num_trans == 0)
944	num_trans = 1;
945	}
946
947	info_ptr->num_trans = (png_uint_16)num_trans;
948	if (num_trans != 0)
949	{
950	info_ptr->valid \|= PNG_INFO_tRNS;
951	#ifdef PNG_FREE_ME_SUPPORTED
952	info_ptr->free_me \|= PNG_FREE_TRNS;
953	#else
954	png_ptr->flags \|= PNG_FLAG_FREE_TRNS;
955	#endif
956	}
957	}
958	#endif
959
960	#if defined(PNG_sPLT_SUPPORTED)
961	void PNGAPI
962	png_set_sPLT(png_structp png_ptr,
963	png_infop info_ptr, png_sPLT_tp entries, int nentries)
964	/*
965	* entries - array of png_sPLT_t structures
966	* to be added to the list of palettes
967	* in the info structure.
968	* nentries - number of palette structures to be
969	* added.
970	*/
971	{
972	png_sPLT_tp np;
973	int i;
974
975	if (png_ptr == NULL \|\| info_ptr == NULL)
976	return;
977
978	np = (png_sPLT_tp)png_malloc_warn(png_ptr,
979	(info_ptr->splt_palettes_num + nentries) *
980	(png_uint_32)png_sizeof(png_sPLT_t));
981	if (np == NULL)
982	{
983	png_warning(png_ptr, "No memory for sPLT palettes.");
984	return;
985	}
986
987	png_memcpy(np, info_ptr->splt_palettes,
988	info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
989	png_free(png_ptr, info_ptr->splt_palettes);
990	info_ptr->splt_palettes=NULL;
991
992	for (i = 0; i < nentries; i++)
993	{
994	png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
995	png_sPLT_tp from = entries + i;
996	png_uint_32 length;
997
998	length = png_strlen(from->name) + 1;
999	to->name = (png_charp)png_malloc_warn(png_ptr, length);
1000	if (to->name == NULL)
1001	{
1002	png_warning(png_ptr,
1003	"Out of memory while processing sPLT chunk");
1004	continue;
1005	}
1006	png_memcpy(to->name, from->name, length);
1007	to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
1008	(png_uint_32)(from->nentries * png_sizeof(png_sPLT_entry)));
1009	if (to->entries == NULL)
1010	{
1011	png_warning(png_ptr,
1012	"Out of memory while processing sPLT chunk");
1013	png_free(png_ptr, to->name);
1014	to->name = NULL;
1015	continue;
1016	}
1017	png_memcpy(to->entries, from->entries,
1018	from->nentries * png_sizeof(png_sPLT_entry));
1019	to->nentries = from->nentries;
1020	to->depth = from->depth;
1021	}
1022
1023	info_ptr->splt_palettes = np;
1024	info_ptr->splt_palettes_num += nentries;
1025	info_ptr->valid \|= PNG_INFO_sPLT;
1026	#ifdef PNG_FREE_ME_SUPPORTED
1027	info_ptr->free_me \|= PNG_FREE_SPLT;
1028	#endif
1029	}
1030	#endif /* PNG_sPLT_SUPPORTED */
1031
1032	#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1033	void PNGAPI
1034	png_set_unknown_chunks(png_structp png_ptr,
1035	png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
1036	{
1037	png_unknown_chunkp np;
1038	int i;
1039
1040	if (png_ptr == NULL \|\| info_ptr == NULL \|\| num_unknowns == 0)
1041	return;
1042
1043	np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
1044	(png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *
1045	png_sizeof(png_unknown_chunk)));
1046	if (np == NULL)
1047	{
1048	png_warning(png_ptr,
1049	"Out of memory while processing unknown chunk.");
1050	return;
1051	}
1052
1053	png_memcpy(np, info_ptr->unknown_chunks,
1054	info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
1055	png_free(png_ptr, info_ptr->unknown_chunks);
1056	info_ptr->unknown_chunks=NULL;
1057
1058	for (i = 0; i < num_unknowns; i++)
1059	{
1060	png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
1061	png_unknown_chunkp from = unknowns + i;
1062
1063	png_memcpy((png_charp)to->name,
1064	(png_charp)from->name,
1065	png_sizeof(from->name));
1066	to->name[png_sizeof(to->name)-1] = '\0';
1067	to->size = from->size;
1068	/* Note our location in the read or write sequence */
1069	to->location = (png_byte)(png_ptr->mode & 0xff);
1070
1071	if (from->size == 0)
1072	to->data=NULL;
1073	else
1074	{
1075	to->data = (png_bytep)png_malloc_warn(png_ptr,
1076	(png_uint_32)from->size);
1077	if (to->data == NULL)
1078	{
1079	png_warning(png_ptr,
1080	"Out of memory while processing unknown chunk.");
1081	to->size = 0;
1082	}
1083	else
1084	png_memcpy(to->data, from->data, from->size);
1085	}
1086	}
1087
1088	info_ptr->unknown_chunks = np;
1089	info_ptr->unknown_chunks_num += num_unknowns;
1090	#ifdef PNG_FREE_ME_SUPPORTED
1091	info_ptr->free_me \|= PNG_FREE_UNKN;
1092	#endif
1093	}
1094	void PNGAPI
1095	png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
1096	int chunk, int location)
1097	{
1098	if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
1099	(int)info_ptr->unknown_chunks_num)
1100	info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1101	}
1102	#endif
1103
1104	#if defined(PNG_1_0_X) \|\| defined(PNG_1_2_X)
1105	#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) \|\| \
1106	defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1107	void PNGAPI
1108	png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
1109	{
1110	/* This function is deprecated in favor of png_permit_mng_features()
1111	and will be removed from libpng-1.3.0 */
1112
1113	png_debug(1, "in png_permit_empty_plte, DEPRECATED.");
1114
1115	if (png_ptr == NULL)
1116	return;
1117	png_ptr->mng_features_permitted = (png_byte)
1118	((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) \|
1119	((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
1120	}
1121	#endif
1122	#endif
1123
1124	#if defined(PNG_MNG_FEATURES_SUPPORTED)
1125	png_uint_32 PNGAPI
1126	png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1127	{
1128	png_debug(1, "in png_permit_mng_features");
1129
1130	if (png_ptr == NULL)
1131	return (png_uint_32)0;
1132	png_ptr->mng_features_permitted =
1133	(png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1134	return (png_uint_32)png_ptr->mng_features_permitted;
1135	}
1136	#endif
1137
1138	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1139	void PNGAPI
1140	png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1141	chunk_list, int num_chunks)
1142	{
1143	png_bytep new_list, p;
1144	int i, old_num_chunks;
1145	if (png_ptr == NULL)
1146	return;
1147	if (num_chunks == 0)
1148	{
1149	if (keep == PNG_HANDLE_CHUNK_ALWAYS \|\| keep == PNG_HANDLE_CHUNK_IF_SAFE)
1150	png_ptr->flags \|= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1151	else
1152	png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1153
1154	if (keep == PNG_HANDLE_CHUNK_ALWAYS)
1155	png_ptr->flags \|= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1156	else
1157	png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1158	return;
1159	}
1160	if (chunk_list == NULL)
1161	return;
1162	old_num_chunks = png_ptr->num_chunk_list;
1163	new_list=(png_bytep)png_malloc(png_ptr,
1164	(png_uint_32)
1165	(5*(num_chunks + old_num_chunks)));
1166	if (png_ptr->chunk_list != NULL)
1167	{
1168	png_memcpy(new_list, png_ptr->chunk_list,
1169	(png_size_t)(5*old_num_chunks));
1170	png_free(png_ptr, png_ptr->chunk_list);
1171	png_ptr->chunk_list=NULL;
1172	}
1173	png_memcpy(new_list + 5*old_num_chunks, chunk_list,
1174	(png_size_t)(5*num_chunks));
1175	for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
1176	*p=(png_byte)keep;
1177	png_ptr->num_chunk_list = old_num_chunks + num_chunks;
1178	png_ptr->chunk_list = new_list;
1179	#ifdef PNG_FREE_ME_SUPPORTED
1180	png_ptr->free_me \|= PNG_FREE_LIST;
1181	#endif
1182	}
1183	#endif
1184
1185	#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1186	void PNGAPI
1187	png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1188	png_user_chunk_ptr read_user_chunk_fn)
1189	{
1190	png_debug(1, "in png_set_read_user_chunk_fn");
1191
1192	if (png_ptr == NULL)
1193	return;
1194
1195	png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1196	png_ptr->user_chunk_ptr = user_chunk_ptr;
1197	}
1198	#endif
1199
1200	#if defined(PNG_INFO_IMAGE_SUPPORTED)
1201	void PNGAPI
1202	png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1203	{
1204	png_debug1(1, "in %s storage function", "rows");
1205
1206	if (png_ptr == NULL \|\| info_ptr == NULL)
1207	return;
1208
1209	if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1210	png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1211	info_ptr->row_pointers = row_pointers;
1212	if (row_pointers)
1213	info_ptr->valid \|= PNG_INFO_IDAT;
1214	}
1215	#endif
1216
1217	#ifdef PNG_WRITE_SUPPORTED
1218	void PNGAPI
1219	png_set_compression_buffer_size(png_structp png_ptr,
1220	png_uint_32 size)
1221	{
1222	if (png_ptr == NULL)
1223	return;
1224	png_free(png_ptr, png_ptr->zbuf);
1225	png_ptr->zbuf_size = (png_size_t)size;
1226	png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1227	png_ptr->zstream.next_out = png_ptr->zbuf;
1228	png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1229	}
1230	#endif
1231
1232	void PNGAPI
1233	png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1234	{
1235	if (png_ptr && info_ptr)
1236	info_ptr->valid &= ~mask;
1237	}
1238
1239
1240	#ifndef PNG_1_0_X
1241	#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1242	/* Function was added to libpng 1.2.0 and should always exist by default */
1243	void PNGAPI
1244	png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1245	{
1246	/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1247	if (png_ptr != NULL)
1248	png_ptr->asm_flags = 0;
1249	asm_flags = asm_flags; /* Quiet the compiler */
1250	}
1251
1252	/* This function was added to libpng 1.2.0 */
1253	void PNGAPI
1254	png_set_mmx_thresholds (png_structp png_ptr,
1255	png_byte mmx_bitdepth_threshold,
1256	png_uint_32 mmx_rowbytes_threshold)
1257	{
1258	/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1259	if (png_ptr == NULL)
1260	return;
1261	/* Quiet the compiler */
1262	mmx_bitdepth_threshold = mmx_bitdepth_threshold;
1263	mmx_rowbytes_threshold = mmx_rowbytes_threshold;
1264	}
1265	#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1266
1267	#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1268	/* This function was added to libpng 1.2.6 */
1269	void PNGAPI
1270	png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
1271	png_uint_32 user_height_max)
1272	{
1273	/* Images with dimensions larger than these limits will be
1274	* rejected by png_set_IHDR(). To accept any PNG datastream
1275	* regardless of dimensions, set both limits to 0x7ffffffL.
1276	*/
1277	if (png_ptr == NULL)
1278	return;
1279	png_ptr->user_width_max = user_width_max;
1280	png_ptr->user_height_max = user_height_max;
1281	}
1282	#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1283
1284	#endif /* ?PNG_1_0_X */
1285	#endif /* PNG_READ_SUPPORTED \|\| PNG_WRITE_SUPPORTED */

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