pngset.c revision 893912bfc2683463dc3e2c445336752d012563d3 
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)
22void PNGAPI
23png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
24{
25   png_debug1(1, "in %s storage function\n", "bKGD");
26   if (png_ptr == NULL || info_ptr == NULL)
27      return;
28
29   png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
30   info_ptr->valid |= PNG_INFO_bKGD;
31}
32#endif
33
34#if defined(PNG_cHRM_SUPPORTED)
35#ifdef PNG_FLOATING_POINT_SUPPORTED
36void PNGAPI
37png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
38   double white_x, double white_y, double red_x, double red_y,
39   double green_x, double green_y, double blue_x, double blue_y)
40{
41   png_debug1(1, "in %s storage function\n", "cHRM");
42   if (png_ptr == NULL || info_ptr == NULL)
43      return;
44   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
92void PNGAPI
93png_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
156void PNGAPI
157png_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
181void PNGAPI
182png_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)
219void PNGAPI
220png_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
261void PNGAPI
262png_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)
370void PNGAPI
371png_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)
386void PNGAPI
387png_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
456void PNGAPI
457png_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
472void PNGAPI
473png_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)
516void PNGAPI
517png_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
531void PNGAPI
532png_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)
581void PNGAPI
582png_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)
595void PNGAPI
596png_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
606void PNGAPI
607png_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)
678void PNGAPI
679png_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)
724void PNGAPI
725png_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
734int /* PRIVATE */
735png_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)
895void PNGAPI
896png_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)
909void PNGAPI
910png_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)
965void PNGAPI
966png_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)
1029void PNGAPI
1030png_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}
1089void PNGAPI
1090png_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)
1102void PNGAPI
1103png_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)
1118png_uint_32 PNGAPI
1119png_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)
1131void PNGAPI
1132png_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)
1177void PNGAPI
1178png_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)
1190void PNGAPI
1191png_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
1207void PNGAPI
1208png_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
1220void PNGAPI
1221png_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 */
1231void PNGAPI
1232png_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 */
1240void PNGAPI
1241png_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 */
1253void PNGAPI
1254png_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 */
1269