pngset.c revision a0bb96c34e65378853ee518bac502842d26c2d1a 
1
2/* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.2.38 [July 16, 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)
24void PNGAPI
25png_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   if (png_ptr == NULL || info_ptr == NULL)
29      return;
30
31   png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
32   info_ptr->valid |= PNG_INFO_bKGD;
33}
34#endif
35
36#if defined(PNG_cHRM_SUPPORTED)
37#ifdef PNG_FLOATING_POINT_SUPPORTED
38void PNGAPI
39png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
40   double white_x, double white_y, double red_x, double red_y,
41   double green_x, double green_y, double blue_x, double blue_y)
42{
43   png_debug1(1, "in %s storage function", "cHRM");
44   if (png_ptr == NULL || info_ptr == NULL)
45      return;
46
47   info_ptr->x_white = (float)white_x;
48   info_ptr->y_white = (float)white_y;
49   info_ptr->x_red   = (float)red_x;
50   info_ptr->y_red   = (float)red_y;
51   info_ptr->x_green = (float)green_x;
52   info_ptr->y_green = (float)green_y;
53   info_ptr->x_blue  = (float)blue_x;
54   info_ptr->y_blue  = (float)blue_y;
55#ifdef PNG_FIXED_POINT_SUPPORTED
56   info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
57   info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
58   info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000.+0.5);
59   info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000.+0.5);
60   info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
61   info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
62   info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000.+0.5);
63   info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000.+0.5);
64#endif
65   info_ptr->valid |= PNG_INFO_cHRM;
66}
67#endif /* PNG_FLOATING_POINT_SUPPORTED */
68
69#ifdef PNG_FIXED_POINT_SUPPORTED
70void PNGAPI
71png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
72   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
73   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
74   png_fixed_point blue_x, png_fixed_point blue_y)
75{
76   png_debug1(1, "in %s storage function", "cHRM fixed");
77   if (png_ptr == NULL || info_ptr == NULL)
78      return;
79
80#if !defined(PNG_NO_CHECK_cHRM)
81   if (png_check_cHRM_fixed(png_ptr,
82      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
83#endif
84   {
85      info_ptr->int_x_white = white_x;
86      info_ptr->int_y_white = white_y;
87      info_ptr->int_x_red   = red_x;
88      info_ptr->int_y_red   = red_y;
89      info_ptr->int_x_green = green_x;
90      info_ptr->int_y_green = green_y;
91      info_ptr->int_x_blue  = blue_x;
92      info_ptr->int_y_blue  = blue_y;
93#ifdef  PNG_FLOATING_POINT_SUPPORTED
94      info_ptr->x_white = (float)(white_x/100000.);
95      info_ptr->y_white = (float)(white_y/100000.);
96      info_ptr->x_red   = (float)(  red_x/100000.);
97      info_ptr->y_red   = (float)(  red_y/100000.);
98      info_ptr->x_green = (float)(green_x/100000.);
99      info_ptr->y_green = (float)(green_y/100000.);
100      info_ptr->x_blue  = (float)( blue_x/100000.);
101      info_ptr->y_blue  = (float)( blue_y/100000.);
102#endif
103      info_ptr->valid |= PNG_INFO_cHRM;
104   }
105}
106#endif /* PNG_FIXED_POINT_SUPPORTED */
107#endif /* PNG_cHRM_SUPPORTED */
108
109#if defined(PNG_gAMA_SUPPORTED)
110#ifdef PNG_FLOATING_POINT_SUPPORTED
111void PNGAPI
112png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
113{
114   double png_gamma;
115   png_debug1(1, "in %s storage function", "gAMA");
116   if (png_ptr == NULL || info_ptr == NULL)
117      return;
118
119   /* Check for overflow */
120   if (file_gamma > 21474.83)
121   {
122      png_warning(png_ptr, "Limiting gamma to 21474.83");
123      png_gamma=21474.83;
124   }
125   else
126      png_gamma = file_gamma;
127   info_ptr->gamma = (float)png_gamma;
128#ifdef PNG_FIXED_POINT_SUPPORTED
129   info_ptr->int_gamma = (int)(png_gamma*100000.+.5);
130#endif
131   info_ptr->valid |= PNG_INFO_gAMA;
132   if (png_gamma == 0.0)
133      png_warning(png_ptr, "Setting gamma=0");
134}
135#endif
136void PNGAPI
137png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
138   int_gamma)
139{
140   png_fixed_point png_gamma;
141
142   png_debug1(1, "in %s storage function", "gAMA");
143   if (png_ptr == NULL || info_ptr == NULL)
144      return;
145
146   if (int_gamma > (png_fixed_point)PNG_UINT_31_MAX)
147   {
148      png_warning(png_ptr, "Limiting gamma to 21474.83");
149      png_gamma=PNG_UINT_31_MAX;
150   }
151   else
152   {
153      if (int_gamma < 0)
154      {
155         png_warning(png_ptr, "Setting negative gamma to zero");
156         png_gamma = 0;
157      }
158      else
159         png_gamma = int_gamma;
160   }
161#ifdef PNG_FLOATING_POINT_SUPPORTED
162   info_ptr->gamma = (float)(png_gamma/100000.);
163#endif
164#ifdef PNG_FIXED_POINT_SUPPORTED
165   info_ptr->int_gamma = png_gamma;
166#endif
167   info_ptr->valid |= PNG_INFO_gAMA;
168   if (png_gamma == 0)
169      png_warning(png_ptr, "Setting gamma=0");
170}
171#endif
172
173#if defined(PNG_hIST_SUPPORTED)
174void PNGAPI
175png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
176{
177   int i;
178
179   png_debug1(1, "in %s storage function", "hIST");
180   if (png_ptr == NULL || info_ptr == NULL)
181      return;
182   if (info_ptr->num_palette == 0 || info_ptr->num_palette
183       > PNG_MAX_PALETTE_LENGTH)
184   {
185      png_warning(png_ptr,
186         "Invalid palette size, hIST allocation skipped.");
187      return;
188   }
189
190#ifdef PNG_FREE_ME_SUPPORTED
191   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
192#endif
193   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
194    * version 1.2.1
195    */
196   png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
197      (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));
198   if (png_ptr->hist == NULL)
199   {
200      png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
201      return;
202   }
203
204   for (i = 0; i < info_ptr->num_palette; i++)
205      png_ptr->hist[i] = hist[i];
206   info_ptr->hist = png_ptr->hist;
207   info_ptr->valid |= PNG_INFO_hIST;
208
209#ifdef PNG_FREE_ME_SUPPORTED
210   info_ptr->free_me |= PNG_FREE_HIST;
211#else
212   png_ptr->flags |= PNG_FLAG_FREE_HIST;
213#endif
214}
215#endif
216
217void PNGAPI
218png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
219   png_uint_32 width, png_uint_32 height, int bit_depth,
220   int color_type, int interlace_type, int compression_type,
221   int filter_type)
222{
223   png_debug1(1, "in %s storage function", "IHDR");
224   if (png_ptr == NULL || info_ptr == NULL)
225      return;
226
227   /* Check for width and height valid values */
228   if (width == 0 || height == 0)
229      png_error(png_ptr, "Image width or height is zero in IHDR");
230#ifdef PNG_SET_USER_LIMITS_SUPPORTED
231   if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
232      png_error(png_ptr, "image size exceeds user limits in IHDR");
233#else
234   if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
235      png_error(png_ptr, "image size exceeds user limits in IHDR");
236#endif
237   if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
238      png_error(png_ptr, "Invalid image size in IHDR");
239   if ( width > (PNG_UINT_32_MAX
240                 >> 3)      /* 8-byte RGBA pixels */
241                 - 64       /* bigrowbuf hack */
242                 - 1        /* filter byte */
243                 - 7*8      /* rounding of width to multiple of 8 pixels */
244                 - 8)       /* extra max_pixel_depth pad */
245      png_warning(png_ptr, "Width is too large for libpng to process pixels");
246
247   /* Check other values */
248   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
249       bit_depth != 8 && bit_depth != 16)
250      png_error(png_ptr, "Invalid bit depth in IHDR");
251
252   if (color_type < 0 || color_type == 1 ||
253       color_type == 5 || color_type > 6)
254      png_error(png_ptr, "Invalid color type in IHDR");
255
256   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
257       ((color_type == PNG_COLOR_TYPE_RGB ||
258         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
259         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
260      png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
261
262   if (interlace_type >= PNG_INTERLACE_LAST)
263      png_error(png_ptr, "Unknown interlace method in IHDR");
264
265   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
266      png_error(png_ptr, "Unknown compression method in IHDR");
267
268#if defined(PNG_MNG_FEATURES_SUPPORTED)
269   /* Accept filter_method 64 (intrapixel differencing) only if
270    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
271    * 2. Libpng did not read a PNG signature (this filter_method is only
272    *    used in PNG datastreams that are embedded in MNG datastreams) and
273    * 3. The application called png_permit_mng_features with a mask that
274    *    included PNG_FLAG_MNG_FILTER_64 and
275    * 4. The filter_method is 64 and
276    * 5. The color_type is RGB or RGBA
277    */
278   if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
279      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
280   if (filter_type != PNG_FILTER_TYPE_BASE)
281   {
282     if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
283         (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
284         ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
285         (color_type == PNG_COLOR_TYPE_RGB ||
286         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
287        png_error(png_ptr, "Unknown filter method in IHDR");
288     if (png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
289        png_warning(png_ptr, "Invalid filter method in IHDR");
290   }
291#else
292   if (filter_type != PNG_FILTER_TYPE_BASE)
293      png_error(png_ptr, "Unknown filter method in IHDR");
294#endif
295
296   info_ptr->width = width;
297   info_ptr->height = height;
298   info_ptr->bit_depth = (png_byte)bit_depth;
299   info_ptr->color_type =(png_byte) color_type;
300   info_ptr->compression_type = (png_byte)compression_type;
301   info_ptr->filter_type = (png_byte)filter_type;
302   info_ptr->interlace_type = (png_byte)interlace_type;
303   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
304      info_ptr->channels = 1;
305   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
306      info_ptr->channels = 3;
307   else
308      info_ptr->channels = 1;
309   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
310      info_ptr->channels++;
311   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
312
313   /* Check for potential overflow */
314   if (width > (PNG_UINT_32_MAX
315                 >> 3)      /* 8-byte RGBA pixels */
316                 - 64       /* bigrowbuf hack */
317                 - 1        /* filter byte */
318                 - 7*8      /* rounding of width to multiple of 8 pixels */
319                 - 8)       /* extra max_pixel_depth pad */
320      info_ptr->rowbytes = (png_size_t)0;
321   else
322      info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
323}
324
325#if defined(PNG_oFFs_SUPPORTED)
326void PNGAPI
327png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
328   png_int_32 offset_x, png_int_32 offset_y, int unit_type)
329{
330   png_debug1(1, "in %s storage function", "oFFs");
331   if (png_ptr == NULL || info_ptr == NULL)
332      return;
333
334   info_ptr->x_offset = offset_x;
335   info_ptr->y_offset = offset_y;
336   info_ptr->offset_unit_type = (png_byte)unit_type;
337   info_ptr->valid |= PNG_INFO_oFFs;
338}
339#endif
340
341#if defined(PNG_pCAL_SUPPORTED)
342void PNGAPI
343png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
344   png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
345   png_charp units, png_charpp params)
346{
347   png_uint_32 length;
348   int i;
349
350   png_debug1(1, "in %s storage function", "pCAL");
351   if (png_ptr == NULL || info_ptr == NULL)
352      return;
353
354   length = png_strlen(purpose) + 1;
355   png_debug1(3, "allocating purpose for info (%lu bytes)",
356     (unsigned long)length);
357   info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
358   if (info_ptr->pcal_purpose == NULL)
359   {
360      png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
361      return;
362   }
363   png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
364
365   png_debug(3, "storing X0, X1, type, and nparams in info");
366   info_ptr->pcal_X0 = X0;
367   info_ptr->pcal_X1 = X1;
368   info_ptr->pcal_type = (png_byte)type;
369   info_ptr->pcal_nparams = (png_byte)nparams;
370
371   length = png_strlen(units) + 1;
372   png_debug1(3, "allocating units for info (%lu bytes)",
373     (unsigned long)length);
374   info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
375   if (info_ptr->pcal_units == NULL)
376   {
377      png_warning(png_ptr, "Insufficient memory for pCAL units.");
378      return;
379   }
380   png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
381
382   info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
383      (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
384   if (info_ptr->pcal_params == NULL)
385   {
386      png_warning(png_ptr, "Insufficient memory for pCAL params.");
387      return;
388   }
389
390   png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));
391
392   for (i = 0; i < nparams; i++)
393   {
394      length = png_strlen(params[i]) + 1;
395      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
396        (unsigned long)length);
397      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
398      if (info_ptr->pcal_params[i] == NULL)
399      {
400         png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
401         return;
402      }
403      png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
404   }
405
406   info_ptr->valid |= PNG_INFO_pCAL;
407#ifdef PNG_FREE_ME_SUPPORTED
408   info_ptr->free_me |= PNG_FREE_PCAL;
409#endif
410}
411#endif
412
413#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
414#ifdef PNG_FLOATING_POINT_SUPPORTED
415void PNGAPI
416png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
417             int unit, double width, double height)
418{
419   png_debug1(1, "in %s storage function", "sCAL");
420   if (png_ptr == NULL || info_ptr == NULL)
421      return;
422
423   info_ptr->scal_unit = (png_byte)unit;
424   info_ptr->scal_pixel_width = width;
425   info_ptr->scal_pixel_height = height;
426
427   info_ptr->valid |= PNG_INFO_sCAL;
428}
429#else
430#ifdef PNG_FIXED_POINT_SUPPORTED
431void PNGAPI
432png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
433             int unit, png_charp swidth, png_charp sheight)
434{
435   png_uint_32 length;
436
437   png_debug1(1, "in %s storage function", "sCAL");
438   if (png_ptr == NULL || info_ptr == NULL)
439      return;
440
441   info_ptr->scal_unit = (png_byte)unit;
442
443   length = png_strlen(swidth) + 1;
444   png_debug1(3, "allocating unit for info (%u bytes)",
445      (unsigned int)length);
446   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
447   if (info_ptr->scal_s_width == NULL)
448   {
449      png_warning(png_ptr,
450       "Memory allocation failed while processing sCAL.");
451      return;
452   }
453   png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
454
455   length = png_strlen(sheight) + 1;
456   png_debug1(3, "allocating unit for info (%u bytes)",
457      (unsigned int)length);
458   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
459   if (info_ptr->scal_s_height == NULL)
460   {
461      png_free (png_ptr, info_ptr->scal_s_width);
462      info_ptr->scal_s_width = NULL;
463      png_warning(png_ptr,
464       "Memory allocation failed while processing sCAL.");
465      return;
466   }
467   png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
468   info_ptr->valid |= PNG_INFO_sCAL;
469#ifdef PNG_FREE_ME_SUPPORTED
470   info_ptr->free_me |= PNG_FREE_SCAL;
471#endif
472}
473#endif
474#endif
475#endif
476
477#if defined(PNG_pHYs_SUPPORTED)
478void PNGAPI
479png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
480   png_uint_32 res_x, png_uint_32 res_y, int unit_type)
481{
482   png_debug1(1, "in %s storage function", "pHYs");
483   if (png_ptr == NULL || info_ptr == NULL)
484      return;
485
486   info_ptr->x_pixels_per_unit = res_x;
487   info_ptr->y_pixels_per_unit = res_y;
488   info_ptr->phys_unit_type = (png_byte)unit_type;
489   info_ptr->valid |= PNG_INFO_pHYs;
490}
491#endif
492
493void PNGAPI
494png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
495   png_colorp palette, int num_palette)
496{
497
498   png_debug1(1, "in %s storage function", "PLTE");
499   if (png_ptr == NULL || info_ptr == NULL)
500      return;
501
502   if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
503   {
504      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
505         png_error(png_ptr, "Invalid palette length");
506      else
507      {
508         png_warning(png_ptr, "Invalid palette length");
509         return;
510      }
511   }
512
513   /*
514    * It may not actually be necessary to set png_ptr->palette here;
515    * we do it for backward compatibility with the way the png_handle_tRNS
516    * function used to do the allocation.
517    */
518#ifdef PNG_FREE_ME_SUPPORTED
519   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
520#endif
521
522   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
523    * of num_palette entries, in case of an invalid PNG file that has
524    * too-large sample values.
525    */
526   png_ptr->palette = (png_colorp)png_malloc(png_ptr,
527      PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
528   png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
529      png_sizeof(png_color));
530   png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
531   info_ptr->palette = png_ptr->palette;
532   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
533
534#ifdef PNG_FREE_ME_SUPPORTED
535   info_ptr->free_me |= PNG_FREE_PLTE;
536#else
537   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
538#endif
539
540   info_ptr->valid |= PNG_INFO_PLTE;
541}
542
543#if defined(PNG_sBIT_SUPPORTED)
544void PNGAPI
545png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
546   png_color_8p sig_bit)
547{
548   png_debug1(1, "in %s storage function", "sBIT");
549   if (png_ptr == NULL || info_ptr == NULL)
550      return;
551
552   png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
553   info_ptr->valid |= PNG_INFO_sBIT;
554}
555#endif
556
557#if defined(PNG_sRGB_SUPPORTED)
558void PNGAPI
559png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
560{
561   png_debug1(1, "in %s storage function", "sRGB");
562   if (png_ptr == NULL || info_ptr == NULL)
563      return;
564
565   info_ptr->srgb_intent = (png_byte)intent;
566   info_ptr->valid |= PNG_INFO_sRGB;
567}
568
569void PNGAPI
570png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
571   int intent)
572{
573#if defined(PNG_gAMA_SUPPORTED)
574#ifdef PNG_FLOATING_POINT_SUPPORTED
575   float file_gamma;
576#endif
577#ifdef PNG_FIXED_POINT_SUPPORTED
578   png_fixed_point int_file_gamma;
579#endif
580#endif
581#if defined(PNG_cHRM_SUPPORTED)
582#ifdef PNG_FLOATING_POINT_SUPPORTED
583   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
584#endif
585   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
586      int_green_y, int_blue_x, int_blue_y;
587#endif
588   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
589   if (png_ptr == NULL || info_ptr == NULL)
590      return;
591
592   png_set_sRGB(png_ptr, info_ptr, intent);
593
594#if defined(PNG_gAMA_SUPPORTED)
595#ifdef PNG_FLOATING_POINT_SUPPORTED
596   file_gamma = (float).45455;
597   png_set_gAMA(png_ptr, info_ptr, file_gamma);
598#endif
599#ifdef PNG_FIXED_POINT_SUPPORTED
600   int_file_gamma = 45455L;
601   png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
602#endif
603#endif
604
605#if defined(PNG_cHRM_SUPPORTED)
606   int_white_x = 31270L;
607   int_white_y = 32900L;
608   int_red_x   = 64000L;
609   int_red_y   = 33000L;
610   int_green_x = 30000L;
611   int_green_y = 60000L;
612   int_blue_x  = 15000L;
613   int_blue_y  =  6000L;
614
615#ifdef PNG_FLOATING_POINT_SUPPORTED
616   white_x = (float).3127;
617   white_y = (float).3290;
618   red_x   = (float).64;
619   red_y   = (float).33;
620   green_x = (float).30;
621   green_y = (float).60;
622   blue_x  = (float).15;
623   blue_y  = (float).06;
624#endif
625
626#if !defined(PNG_NO_CHECK_cHRM)
627   if (png_check_cHRM_fixed(png_ptr,
628       int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
629       int_green_y, int_blue_x, int_blue_y))
630#endif
631   {
632#ifdef PNG_FIXED_POINT_SUPPORTED
633      png_set_cHRM_fixed(png_ptr, info_ptr,
634          int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
635          int_green_y, int_blue_x, int_blue_y);
636#endif
637#ifdef PNG_FLOATING_POINT_SUPPORTED
638      png_set_cHRM(png_ptr, info_ptr,
639          white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
640#endif
641   }
642#endif /* cHRM */
643}
644#endif /* sRGB */
645
646
647#if defined(PNG_iCCP_SUPPORTED)
648void PNGAPI
649png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
650             png_charp name, int compression_type,
651             png_charp profile, png_uint_32 proflen)
652{
653   png_charp new_iccp_name;
654   png_charp new_iccp_profile;
655   png_uint_32 length;
656
657   png_debug1(1, "in %s storage function", "iCCP");
658   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
659      return;
660
661   length = png_strlen(name)+1;
662   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
663   if (new_iccp_name == NULL)
664   {
665      png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
666      return;
667   }
668   png_memcpy(new_iccp_name, name, length);
669   new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
670   if (new_iccp_profile == NULL)
671   {
672      png_free (png_ptr, new_iccp_name);
673      png_warning(png_ptr,
674      "Insufficient memory to process iCCP profile.");
675      return;
676   }
677   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
678
679   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
680
681   info_ptr->iccp_proflen = proflen;
682   info_ptr->iccp_name = new_iccp_name;
683   info_ptr->iccp_profile = new_iccp_profile;
684   /* Compression is always zero but is here so the API and info structure
685    * does not have to change if we introduce multiple compression types */
686   info_ptr->iccp_compression = (png_byte)compression_type;
687#ifdef PNG_FREE_ME_SUPPORTED
688   info_ptr->free_me |= PNG_FREE_ICCP;
689#endif
690   info_ptr->valid |= PNG_INFO_iCCP;
691}
692#endif
693
694#if defined(PNG_TEXT_SUPPORTED)
695void PNGAPI
696png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
697             int num_text)
698{
699   int ret;
700   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
701   if (ret)
702      png_error(png_ptr, "Insufficient memory to store text");
703}
704
705int /* PRIVATE */
706png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
707               int num_text)
708{
709   int i;
710
711   png_debug1(1, "in %s storage function", (png_ptr->chunk_name[0] == '\0' ?
712      "text" : (png_const_charp)png_ptr->chunk_name));
713
714   if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
715      return(0);
716
717   /* Make sure we have enough space in the "text" array in info_struct
718    * to hold all of the incoming text_ptr objects.
719    */
720   if (info_ptr->num_text + num_text > info_ptr->max_text)
721   {
722      if (info_ptr->text != NULL)
723      {
724         png_textp old_text;
725         int old_max;
726
727         old_max = info_ptr->max_text;
728         info_ptr->max_text = info_ptr->num_text + num_text + 8;
729         old_text = info_ptr->text;
730         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
731            (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
732         if (info_ptr->text == NULL)
733         {
734            png_free(png_ptr, old_text);
735            return(1);
736         }
737         png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
738            png_sizeof(png_text)));
739         png_free(png_ptr, old_text);
740      }
741      else
742      {
743         info_ptr->max_text = num_text + 8;
744         info_ptr->num_text = 0;
745         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
746            (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
747         if (info_ptr->text == NULL)
748            return(1);
749#ifdef PNG_FREE_ME_SUPPORTED
750         info_ptr->free_me |= PNG_FREE_TEXT;
751#endif
752      }
753      png_debug1(3, "allocated %d entries for info_ptr->text",
754         info_ptr->max_text);
755   }
756   for (i = 0; i < num_text; i++)
757   {
758      png_size_t text_length, key_len;
759      png_size_t lang_len, lang_key_len;
760      png_textp textp = &(info_ptr->text[info_ptr->num_text]);
761
762      if (text_ptr[i].key == NULL)
763          continue;
764
765      key_len = png_strlen(text_ptr[i].key);
766
767      if (text_ptr[i].compression <= 0)
768      {
769         lang_len = 0;
770         lang_key_len = 0;
771      }
772      else
773#ifdef PNG_iTXt_SUPPORTED
774      {
775         /* Set iTXt data */
776         if (text_ptr[i].lang != NULL)
777            lang_len = png_strlen(text_ptr[i].lang);
778         else
779            lang_len = 0;
780         if (text_ptr[i].lang_key != NULL)
781            lang_key_len = png_strlen(text_ptr[i].lang_key);
782         else
783            lang_key_len = 0;
784      }
785#else
786      {
787         png_warning(png_ptr, "iTXt chunk not supported.");
788         continue;
789      }
790#endif
791
792      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
793      {
794         text_length = 0;
795#ifdef PNG_iTXt_SUPPORTED
796         if (text_ptr[i].compression > 0)
797            textp->compression = PNG_ITXT_COMPRESSION_NONE;
798         else
799#endif
800            textp->compression = PNG_TEXT_COMPRESSION_NONE;
801      }
802      else
803      {
804         text_length = png_strlen(text_ptr[i].text);
805         textp->compression = text_ptr[i].compression;
806      }
807
808      textp->key = (png_charp)png_malloc_warn(png_ptr,
809         (png_uint_32)
810         (key_len + text_length + lang_len + lang_key_len + 4));
811      if (textp->key == NULL)
812         return(1);
813      png_debug2(2, "Allocated %lu bytes at %x in png_set_text",
814                 (png_uint_32)
815                 (key_len + lang_len + lang_key_len + text_length + 4),
816                 (int)textp->key);
817
818      png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
819      *(textp->key + key_len) = '\0';
820#ifdef PNG_iTXt_SUPPORTED
821      if (text_ptr[i].compression > 0)
822      {
823         textp->lang = textp->key + key_len + 1;
824         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
825         *(textp->lang + lang_len) = '\0';
826         textp->lang_key = textp->lang + lang_len + 1;
827         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
828         *(textp->lang_key + lang_key_len) = '\0';
829         textp->text = textp->lang_key + lang_key_len + 1;
830      }
831      else
832#endif
833      {
834#ifdef PNG_iTXt_SUPPORTED
835         textp->lang=NULL;
836         textp->lang_key=NULL;
837#endif
838         textp->text = textp->key + key_len + 1;
839      }
840      if (text_length)
841         png_memcpy(textp->text, text_ptr[i].text,
842            (png_size_t)(text_length));
843      *(textp->text + text_length) = '\0';
844
845#ifdef PNG_iTXt_SUPPORTED
846      if (textp->compression > 0)
847      {
848         textp->text_length = 0;
849         textp->itxt_length = text_length;
850      }
851      else
852#endif
853      {
854         textp->text_length = text_length;
855#ifdef PNG_iTXt_SUPPORTED
856         textp->itxt_length = 0;
857#endif
858      }
859      info_ptr->num_text++;
860      png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
861   }
862   return(0);
863}
864#endif
865
866#if defined(PNG_tIME_SUPPORTED)
867void PNGAPI
868png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
869{
870   png_debug1(1, "in %s storage function", "tIME");
871   if (png_ptr == NULL || info_ptr == NULL ||
872       (png_ptr->mode & PNG_WROTE_tIME))
873      return;
874
875   png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
876   info_ptr->valid |= PNG_INFO_tIME;
877}
878#endif
879
880#if defined(PNG_tRNS_SUPPORTED)
881void PNGAPI
882png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
883   png_bytep trans, int num_trans, png_color_16p trans_values)
884{
885   png_debug1(1, "in %s storage function", "tRNS");
886   if (png_ptr == NULL || info_ptr == NULL)
887      return;
888
889   if (trans != NULL)
890   {
891       /*
892        * It may not actually be necessary to set png_ptr->trans here;
893        * we do it for backward compatibility with the way the png_handle_tRNS
894        * function used to do the allocation.
895        */
896
897#ifdef PNG_FREE_ME_SUPPORTED
898       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
899#endif
900
901       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
902       png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
903           (png_uint_32)PNG_MAX_PALETTE_LENGTH);
904       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
905          png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
906   }
907
908   if (trans_values != NULL)
909   {
910      int sample_max = (1 << info_ptr->bit_depth);
911      if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
912          (int)trans_values->gray > sample_max) ||
913          (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
914          ((int)trans_values->red > sample_max ||
915          (int)trans_values->green > sample_max ||
916          (int)trans_values->blue > sample_max)))
917         png_warning(png_ptr,
918            "tRNS chunk has out-of-range samples for bit_depth");
919      png_memcpy(&(info_ptr->trans_values), trans_values,
920         png_sizeof(png_color_16));
921      if (num_trans == 0)
922         num_trans = 1;
923   }
924
925   info_ptr->num_trans = (png_uint_16)num_trans;
926   if (num_trans != 0)
927   {
928      info_ptr->valid |= PNG_INFO_tRNS;
929#ifdef PNG_FREE_ME_SUPPORTED
930      info_ptr->free_me |= PNG_FREE_TRNS;
931#else
932      png_ptr->flags |= PNG_FLAG_FREE_TRNS;
933#endif
934   }
935}
936#endif
937
938#if defined(PNG_sPLT_SUPPORTED)
939void PNGAPI
940png_set_sPLT(png_structp png_ptr,
941             png_infop info_ptr, png_sPLT_tp entries, int nentries)
942/*
943 *  entries        - array of png_sPLT_t structures
944 *                   to be added to the list of palettes
945 *                   in the info structure.
946 *  nentries       - number of palette structures to be
947 *                   added.
948 */
949{
950   png_sPLT_tp np;
951   int i;
952
953   if (png_ptr == NULL || info_ptr == NULL)
954      return;
955
956   np = (png_sPLT_tp)png_malloc_warn(png_ptr,
957       (info_ptr->splt_palettes_num + nentries) *
958        (png_uint_32)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      png_uint_32 length;
975
976      length = png_strlen(from->name) + 1;
977        to->name = (png_charp)png_malloc_warn(png_ptr, length);
978      if (to->name == NULL)
979      {
980         png_warning(png_ptr,
981           "Out of memory while processing sPLT chunk");
982         continue;
983      }
984      png_memcpy(to->name, from->name, length);
985      to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
986            (png_uint_32)(from->nentries * png_sizeof(png_sPLT_entry)));
987      if (to->entries == NULL)
988      {
989         png_warning(png_ptr,
990           "Out of memory while processing sPLT chunk");
991         png_free(png_ptr, to->name);
992         to->name = NULL;
993         continue;
994      }
995      png_memcpy(to->entries, from->entries,
996          from->nentries * png_sizeof(png_sPLT_entry));
997      to->nentries = from->nentries;
998      to->depth = from->depth;
999   }
1000
1001   info_ptr->splt_palettes = np;
1002   info_ptr->splt_palettes_num += nentries;
1003   info_ptr->valid |= PNG_INFO_sPLT;
1004#ifdef PNG_FREE_ME_SUPPORTED
1005   info_ptr->free_me |= PNG_FREE_SPLT;
1006#endif
1007}
1008#endif /* PNG_sPLT_SUPPORTED */
1009
1010#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1011void PNGAPI
1012png_set_unknown_chunks(png_structp png_ptr,
1013   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
1014{
1015   png_unknown_chunkp np;
1016   int i;
1017
1018   if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
1019      return;
1020
1021   np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
1022       (png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *
1023       png_sizeof(png_unknown_chunk)));
1024   if (np == NULL)
1025   {
1026      png_warning(png_ptr,
1027         "Out of memory while processing unknown chunk.");
1028      return;
1029   }
1030
1031   png_memcpy(np, info_ptr->unknown_chunks,
1032          info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
1033   png_free(png_ptr, info_ptr->unknown_chunks);
1034   info_ptr->unknown_chunks=NULL;
1035
1036   for (i = 0; i < num_unknowns; i++)
1037   {
1038      png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
1039      png_unknown_chunkp from = unknowns + i;
1040
1041      png_memcpy((png_charp)to->name,
1042                 (png_charp)from->name,
1043                 png_sizeof(from->name));
1044      to->name[png_sizeof(to->name)-1] = '\0';
1045      to->size = from->size;
1046      /* Note our location in the read or write sequence */
1047      to->location = (png_byte)(png_ptr->mode & 0xff);
1048
1049      if (from->size == 0)
1050         to->data=NULL;
1051      else
1052      {
1053         to->data = (png_bytep)png_malloc_warn(png_ptr,
1054           (png_uint_32)from->size);
1055         if (to->data == NULL)
1056         {
1057            png_warning(png_ptr,
1058             "Out of memory while processing unknown chunk.");
1059            to->size = 0;
1060         }
1061         else
1062            png_memcpy(to->data, from->data, from->size);
1063      }
1064   }
1065
1066   info_ptr->unknown_chunks = np;
1067   info_ptr->unknown_chunks_num += num_unknowns;
1068#ifdef PNG_FREE_ME_SUPPORTED
1069   info_ptr->free_me |= PNG_FREE_UNKN;
1070#endif
1071}
1072void PNGAPI
1073png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
1074   int chunk, int location)
1075{
1076   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
1077         (int)info_ptr->unknown_chunks_num)
1078      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1079}
1080#endif
1081
1082#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
1083#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1084    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1085void PNGAPI
1086png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
1087{
1088   /* This function is deprecated in favor of png_permit_mng_features()
1089      and will be removed from libpng-1.3.0 */
1090   png_debug(1, "in png_permit_empty_plte, DEPRECATED.");
1091   if (png_ptr == NULL)
1092      return;
1093   png_ptr->mng_features_permitted = (png_byte)
1094     ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) |
1095     ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
1096}
1097#endif
1098#endif
1099
1100#if defined(PNG_MNG_FEATURES_SUPPORTED)
1101png_uint_32 PNGAPI
1102png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1103{
1104   png_debug(1, "in png_permit_mng_features");
1105   if (png_ptr == NULL)
1106      return (png_uint_32)0;
1107   png_ptr->mng_features_permitted =
1108     (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1109   return (png_uint_32)png_ptr->mng_features_permitted;
1110}
1111#endif
1112
1113#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1114void PNGAPI
1115png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1116   chunk_list, int num_chunks)
1117{
1118   png_bytep new_list, p;
1119   int i, old_num_chunks;
1120   if (png_ptr == NULL)
1121      return;
1122   if (num_chunks == 0)
1123   {
1124      if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
1125         png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1126      else
1127         png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1128
1129      if (keep == PNG_HANDLE_CHUNK_ALWAYS)
1130         png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1131      else
1132         png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1133      return;
1134   }
1135   if (chunk_list == NULL)
1136      return;
1137   old_num_chunks = png_ptr->num_chunk_list;
1138   new_list=(png_bytep)png_malloc(png_ptr,
1139      (png_uint_32)
1140      (5*(num_chunks + old_num_chunks)));
1141   if (png_ptr->chunk_list != NULL)
1142   {
1143      png_memcpy(new_list, png_ptr->chunk_list,
1144         (png_size_t)(5*old_num_chunks));
1145      png_free(png_ptr, png_ptr->chunk_list);
1146      png_ptr->chunk_list=NULL;
1147   }
1148   png_memcpy(new_list + 5*old_num_chunks, chunk_list,
1149      (png_size_t)(5*num_chunks));
1150   for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
1151      *p=(png_byte)keep;
1152   png_ptr->num_chunk_list = old_num_chunks + num_chunks;
1153   png_ptr->chunk_list = new_list;
1154#ifdef PNG_FREE_ME_SUPPORTED
1155   png_ptr->free_me |= PNG_FREE_LIST;
1156#endif
1157}
1158#endif
1159
1160#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1161void PNGAPI
1162png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1163   png_user_chunk_ptr read_user_chunk_fn)
1164{
1165   png_debug(1, "in png_set_read_user_chunk_fn");
1166   if (png_ptr == NULL)
1167      return;
1168   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1169   png_ptr->user_chunk_ptr = user_chunk_ptr;
1170}
1171#endif
1172
1173#if defined(PNG_INFO_IMAGE_SUPPORTED)
1174void PNGAPI
1175png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1176{
1177   png_debug1(1, "in %s storage function", "rows");
1178
1179   if (png_ptr == NULL || info_ptr == NULL)
1180      return;
1181
1182   if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1183      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1184   info_ptr->row_pointers = row_pointers;
1185   if (row_pointers)
1186      info_ptr->valid |= PNG_INFO_IDAT;
1187}
1188#endif
1189
1190#ifdef PNG_WRITE_SUPPORTED
1191void PNGAPI
1192png_set_compression_buffer_size(png_structp png_ptr,
1193    png_uint_32 size)
1194{
1195    if (png_ptr == NULL)
1196       return;
1197    png_free(png_ptr, png_ptr->zbuf);
1198    png_ptr->zbuf_size = (png_size_t)size;
1199    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1200    png_ptr->zstream.next_out = png_ptr->zbuf;
1201    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1202}
1203#endif
1204
1205void PNGAPI
1206png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1207{
1208   if (png_ptr && info_ptr)
1209      info_ptr->valid &= ~mask;
1210}
1211
1212
1213#ifndef PNG_1_0_X
1214#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1215/* Function was added to libpng 1.2.0 and should always exist by default */
1216void PNGAPI
1217png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1218{
1219/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1220    if (png_ptr != NULL)
1221    png_ptr->asm_flags = 0;
1222    asm_flags = asm_flags; /* Quiet the compiler */
1223}
1224
1225/* This function was added to libpng 1.2.0 */
1226void PNGAPI
1227png_set_mmx_thresholds (png_structp png_ptr,
1228                        png_byte mmx_bitdepth_threshold,
1229                        png_uint_32 mmx_rowbytes_threshold)
1230{
1231/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
1232    if (png_ptr == NULL)
1233       return;
1234    /* Quiet the compiler */
1235    mmx_bitdepth_threshold = mmx_bitdepth_threshold;
1236    mmx_rowbytes_threshold = mmx_rowbytes_threshold;
1237}
1238#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1239
1240#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1241/* This function was added to libpng 1.2.6 */
1242void PNGAPI
1243png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
1244    png_uint_32 user_height_max)
1245{
1246   /* Images with dimensions larger than these limits will be
1247    * rejected by png_set_IHDR().  To accept any PNG datastream
1248    * regardless of dimensions, set both limits to 0x7ffffffL.
1249    */
1250   if (png_ptr == NULL)
1251      return;
1252   png_ptr->user_width_max = user_width_max;
1253   png_ptr->user_height_max = user_height_max;
1254}
1255#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1256
1257#endif /* ?PNG_1_0_X */
1258#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
1259