pngset.c revision 55f4e4a5ec657a017e3bf75299ad71fd1c968dd3 
1
2/* pngset.c - storage of image information into info struct
3 *
4 * Last changed in libpng 1.2.17 May 15, 2007
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2007 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 *
10 * The functions here are used during reads to store data from the file
11 * into the info struct, and during writes to store application data
12 * into the info struct for writing into the file.  This abstracts the
13 * info struct and allows us to change the structure in the future.
14 */
15
16#define PNG_INTERNAL
17#include "png.h"
18
19#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
20
21#if defined(PNG_bKGD_SUPPORTED)
22void PNGAPI
23png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
24{
25   png_debug1(1, "in %s storage function\n", "bKGD");
26   if (png_ptr == NULL || info_ptr == NULL)
27      return;
28
29   png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
30   info_ptr->valid |= PNG_INFO_bKGD;
31}
32#endif
33
34#if defined(PNG_cHRM_SUPPORTED)
35#ifdef PNG_FLOATING_POINT_SUPPORTED
36void PNGAPI
37png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
38   double white_x, double white_y, double red_x, double red_y,
39   double green_x, double green_y, double blue_x, double blue_y)
40{
41   png_debug1(1, "in %s storage function\n", "cHRM");
42   if (png_ptr == NULL || info_ptr == NULL)
43      return;
44
45   if (white_x < 0.0 || white_y < 0.0 ||
46         red_x < 0.0 ||   red_y < 0.0 ||
47       green_x < 0.0 || green_y < 0.0 ||
48        blue_x < 0.0 ||  blue_y < 0.0)
49   {
50      png_warning(png_ptr,
51        "Ignoring attempt to set negative chromaticity value");
52      return;
53   }
54   if (white_x > 21474.83 || white_y > 21474.83 ||
55         red_x > 21474.83 ||   red_y > 21474.83 ||
56       green_x > 21474.83 || green_y > 21474.83 ||
57        blue_x > 21474.83 ||  blue_y > 21474.83)
58   {
59      png_warning(png_ptr,
60        "Ignoring attempt to set chromaticity value exceeding 21474.83");
61      return;
62   }
63
64   info_ptr->x_white = (float)white_x;
65   info_ptr->y_white = (float)white_y;
66   info_ptr->x_red   = (float)red_x;
67   info_ptr->y_red   = (float)red_y;
68   info_ptr->x_green = (float)green_x;
69   info_ptr->y_green = (float)green_y;
70   info_ptr->x_blue  = (float)blue_x;
71   info_ptr->y_blue  = (float)blue_y;
72#ifdef PNG_FIXED_POINT_SUPPORTED
73   info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
74   info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
75   info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000.+0.5);
76   info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000.+0.5);
77   info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
78   info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
79   info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000.+0.5);
80   info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000.+0.5);
81#endif
82   info_ptr->valid |= PNG_INFO_cHRM;
83}
84#endif
85#ifdef PNG_FIXED_POINT_SUPPORTED
86void PNGAPI
87png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
88   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
89   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
90   png_fixed_point blue_x, png_fixed_point blue_y)
91{
92   png_debug1(1, "in %s storage function\n", "cHRM");
93   if (png_ptr == NULL || info_ptr == NULL)
94      return;
95
96   if (white_x < 0 || white_y < 0 ||
97         red_x < 0 ||   red_y < 0 ||
98       green_x < 0 || green_y < 0 ||
99        blue_x < 0 ||  blue_y < 0)
100   {
101      png_warning(png_ptr,
102        "Ignoring attempt to set negative chromaticity value");
103      return;
104   }
105#ifdef PNG_FLOATING_POINT_SUPPORTED
106   if (white_x > (double) PNG_UINT_31_MAX ||
107       white_y > (double) PNG_UINT_31_MAX ||
108         red_x > (double) PNG_UINT_31_MAX ||
109         red_y > (double) PNG_UINT_31_MAX ||
110       green_x > (double) PNG_UINT_31_MAX ||
111       green_y > (double) PNG_UINT_31_MAX ||
112        blue_x > (double) PNG_UINT_31_MAX ||
113        blue_y > (double) PNG_UINT_31_MAX)
114#else
115   if (white_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
116       white_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
117         red_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
118         red_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
119       green_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
120       green_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
121        blue_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||
122        blue_y > (png_fixed_point) PNG_UINT_31_MAX/100000L)
123#endif
124   {
125      png_warning(png_ptr,
126        "Ignoring attempt to set chromaticity value exceeding 21474.83");
127      return;
128   }
129   info_ptr->int_x_white = white_x;
130   info_ptr->int_y_white = white_y;
131   info_ptr->int_x_red   = red_x;
132   info_ptr->int_y_red   = red_y;
133   info_ptr->int_x_green = green_x;
134   info_ptr->int_y_green = green_y;
135   info_ptr->int_x_blue  = blue_x;
136   info_ptr->int_y_blue  = blue_y;
137#ifdef PNG_FLOATING_POINT_SUPPORTED
138   info_ptr->x_white = (float)(white_x/100000.);
139   info_ptr->y_white = (float)(white_y/100000.);
140   info_ptr->x_red   = (float)(  red_x/100000.);
141   info_ptr->y_red   = (float)(  red_y/100000.);
142   info_ptr->x_green = (float)(green_x/100000.);
143   info_ptr->y_green = (float)(green_y/100000.);
144   info_ptr->x_blue  = (float)( blue_x/100000.);
145   info_ptr->y_blue  = (float)( blue_y/100000.);
146#endif
147   info_ptr->valid |= PNG_INFO_cHRM;
148}
149#endif
150#endif
151
152#if defined(PNG_gAMA_SUPPORTED)
153#ifdef PNG_FLOATING_POINT_SUPPORTED
154void PNGAPI
155png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
156{
157   double gamma;
158   png_debug1(1, "in %s storage function\n", "gAMA");
159   if (png_ptr == NULL || info_ptr == NULL)
160      return;
161
162   /* Check for overflow */
163   if (file_gamma > 21474.83)
164   {
165      png_warning(png_ptr, "Limiting gamma to 21474.83");
166      gamma=21474.83;
167   }
168   else
169      gamma=file_gamma;
170   info_ptr->gamma = (float)gamma;
171#ifdef PNG_FIXED_POINT_SUPPORTED
172   info_ptr->int_gamma = (int)(gamma*100000.+.5);
173#endif
174   info_ptr->valid |= PNG_INFO_gAMA;
175   if(gamma == 0.0)
176      png_warning(png_ptr, "Setting gamma=0");
177}
178#endif
179void PNGAPI
180png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
181   int_gamma)
182{
183   png_fixed_point gamma;
184
185   png_debug1(1, "in %s storage function\n", "gAMA");
186   if (png_ptr == NULL || info_ptr == NULL)
187      return;
188
189   if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
190   {
191     png_warning(png_ptr, "Limiting gamma to 21474.83");
192     gamma=PNG_UINT_31_MAX;
193   }
194   else
195   {
196     if (int_gamma < 0)
197     {
198       png_warning(png_ptr, "Setting negative gamma to zero");
199       gamma=0;
200     }
201     else
202       gamma=int_gamma;
203   }
204#ifdef PNG_FLOATING_POINT_SUPPORTED
205   info_ptr->gamma = (float)(gamma/100000.);
206#endif
207#ifdef PNG_FIXED_POINT_SUPPORTED
208   info_ptr->int_gamma = gamma;
209#endif
210   info_ptr->valid |= PNG_INFO_gAMA;
211   if(gamma == 0)
212      png_warning(png_ptr, "Setting gamma=0");
213}
214#endif
215
216#if defined(PNG_hIST_SUPPORTED)
217void PNGAPI
218png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
219{
220   int i;
221
222   png_debug1(1, "in %s storage function\n", "hIST");
223   if (png_ptr == NULL || info_ptr == NULL)
224      return;
225   if (info_ptr->num_palette <= 0 || info_ptr->num_palette
226       > PNG_MAX_PALETTE_LENGTH)
227   {
228       png_warning(png_ptr,
229          "Invalid palette size, hIST allocation skipped.");
230       return;
231   }
232
233#ifdef PNG_FREE_ME_SUPPORTED
234   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
235#endif
236   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
237      1.2.1 */
238   png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
239      (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof (png_uint_16)));
240   if (png_ptr->hist == NULL)
241     {
242       png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
243       return;
244     }
245
246   for (i = 0; i < info_ptr->num_palette; i++)
247       png_ptr->hist[i] = hist[i];
248   info_ptr->hist = png_ptr->hist;
249   info_ptr->valid |= PNG_INFO_hIST;
250
251#ifdef PNG_FREE_ME_SUPPORTED
252   info_ptr->free_me |= PNG_FREE_HIST;
253#else
254   png_ptr->flags |= PNG_FLAG_FREE_HIST;
255#endif
256}
257#endif
258
259void PNGAPI
260png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
261   png_uint_32 width, png_uint_32 height, int bit_depth,
262   int color_type, int interlace_type, int compression_type,
263   int filter_type)
264{
265   png_debug1(1, "in %s storage function\n", "IHDR");
266   if (png_ptr == NULL || info_ptr == NULL)
267      return;
268
269   /* check for width and height valid values */
270   if (width == 0 || height == 0)
271      png_error(png_ptr, "Image width or height is zero in IHDR");
272#ifdef PNG_SET_USER_LIMITS_SUPPORTED
273   if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
274      png_error(png_ptr, "image size exceeds user limits in IHDR");
275#else
276   if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
277      png_error(png_ptr, "image size exceeds user limits in IHDR");
278#endif
279   if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
280      png_error(png_ptr, "Invalid image size in IHDR");
281   if ( width > (PNG_UINT_32_MAX
282                 >> 3)      /* 8-byte RGBA pixels */
283                 - 64       /* bigrowbuf hack */
284                 - 1        /* filter byte */
285                 - 7*8      /* rounding of width to multiple of 8 pixels */
286                 - 8)       /* extra max_pixel_depth pad */
287      png_warning(png_ptr, "Width is too large for libpng to process pixels");
288
289   /* check other values */
290   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
291      bit_depth != 8 && bit_depth != 16)
292      png_error(png_ptr, "Invalid bit depth in IHDR");
293
294   if (color_type < 0 || color_type == 1 ||
295      color_type == 5 || color_type > 6)
296      png_error(png_ptr, "Invalid color type in IHDR");
297
298   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
299       ((color_type == PNG_COLOR_TYPE_RGB ||
300         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
301         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
302      png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
303
304   if (interlace_type >= PNG_INTERLACE_LAST)
305      png_error(png_ptr, "Unknown interlace method in IHDR");
306
307   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
308      png_error(png_ptr, "Unknown compression method in IHDR");
309
310#if defined(PNG_MNG_FEATURES_SUPPORTED)
311   /* Accept filter_method 64 (intrapixel differencing) only if
312    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
313    * 2. Libpng did not read a PNG signature (this filter_method is only
314    *    used in PNG datastreams that are embedded in MNG datastreams) and
315    * 3. The application called png_permit_mng_features with a mask that
316    *    included PNG_FLAG_MNG_FILTER_64 and
317    * 4. The filter_method is 64 and
318    * 5. The color_type is RGB or RGBA
319    */
320   if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
321      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream");
322   if(filter_type != PNG_FILTER_TYPE_BASE)
323   {
324     if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
325        (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
326        ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
327        (color_type == PNG_COLOR_TYPE_RGB ||
328         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
329        png_error(png_ptr, "Unknown filter method in IHDR");
330     if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
331        png_warning(png_ptr, "Invalid filter method in IHDR");
332   }
333#else
334   if(filter_type != PNG_FILTER_TYPE_BASE)
335      png_error(png_ptr, "Unknown filter method in IHDR");
336#endif
337
338   info_ptr->width = width;
339   info_ptr->height = height;
340   info_ptr->bit_depth = (png_byte)bit_depth;
341   info_ptr->color_type =(png_byte) color_type;
342   info_ptr->compression_type = (png_byte)compression_type;
343   info_ptr->filter_type = (png_byte)filter_type;
344   info_ptr->interlace_type = (png_byte)interlace_type;
345   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
346      info_ptr->channels = 1;
347   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
348      info_ptr->channels = 3;
349   else
350      info_ptr->channels = 1;
351   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
352      info_ptr->channels++;
353   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
354
355   /* check for potential overflow */
356   if (width > (PNG_UINT_32_MAX
357                 >> 3)      /* 8-byte RGBA pixels */
358                 - 64       /* bigrowbuf hack */
359                 - 1        /* filter byte */
360                 - 7*8      /* rounding of width to multiple of 8 pixels */
361                 - 8)       /* extra max_pixel_depth pad */
362      info_ptr->rowbytes = (png_size_t)0;
363   else
364      info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width);
365}
366
367#if defined(PNG_oFFs_SUPPORTED)
368void PNGAPI
369png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
370   png_int_32 offset_x, png_int_32 offset_y, int unit_type)
371{
372   png_debug1(1, "in %s storage function\n", "oFFs");
373   if (png_ptr == NULL || info_ptr == NULL)
374      return;
375
376   info_ptr->x_offset = offset_x;
377   info_ptr->y_offset = offset_y;
378   info_ptr->offset_unit_type = (png_byte)unit_type;
379   info_ptr->valid |= PNG_INFO_oFFs;
380}
381#endif
382
383#if defined(PNG_pCAL_SUPPORTED)
384void PNGAPI
385png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
386   png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
387   png_charp units, png_charpp params)
388{
389   png_uint_32 length;
390   int i;
391
392   png_debug1(1, "in %s storage function\n", "pCAL");
393   if (png_ptr == NULL || info_ptr == NULL)
394      return;
395
396   length = png_strlen(purpose) + 1;
397   png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
398   info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
399   if (info_ptr->pcal_purpose == NULL)
400     {
401       png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
402       return;
403     }
404   png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
405
406   png_debug(3, "storing X0, X1, type, and nparams in info\n");
407   info_ptr->pcal_X0 = X0;
408   info_ptr->pcal_X1 = X1;
409   info_ptr->pcal_type = (png_byte)type;
410   info_ptr->pcal_nparams = (png_byte)nparams;
411
412   length = png_strlen(units) + 1;
413   png_debug1(3, "allocating units for info (%lu bytes)\n", length);
414   info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
415   if (info_ptr->pcal_units == NULL)
416     {
417       png_warning(png_ptr, "Insufficient memory for pCAL units.");
418       return;
419     }
420   png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
421
422   info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
423      (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
424   if (info_ptr->pcal_params == NULL)
425     {
426       png_warning(png_ptr, "Insufficient memory for pCAL params.");
427       return;
428     }
429
430   info_ptr->pcal_params[nparams] = NULL;
431
432   for (i = 0; i < nparams; i++)
433   {
434      length = png_strlen(params[i]) + 1;
435      png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
436      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
437      if (info_ptr->pcal_params[i] == NULL)
438        {
439          png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
440          return;
441        }
442      png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
443   }
444
445   info_ptr->valid |= PNG_INFO_pCAL;
446#ifdef PNG_FREE_ME_SUPPORTED
447   info_ptr->free_me |= PNG_FREE_PCAL;
448#endif
449}
450#endif
451
452#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
453#ifdef PNG_FLOATING_POINT_SUPPORTED
454void PNGAPI
455png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
456             int unit, double width, double height)
457{
458   png_debug1(1, "in %s storage function\n", "sCAL");
459   if (png_ptr == NULL || info_ptr == NULL)
460      return;
461
462   info_ptr->scal_unit = (png_byte)unit;
463   info_ptr->scal_pixel_width = width;
464   info_ptr->scal_pixel_height = height;
465
466   info_ptr->valid |= PNG_INFO_sCAL;
467}
468#else
469#ifdef PNG_FIXED_POINT_SUPPORTED
470void PNGAPI
471png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
472             int unit, png_charp swidth, png_charp sheight)
473{
474   png_uint_32 length;
475
476   png_debug1(1, "in %s storage function\n", "sCAL");
477   if (png_ptr == NULL || info_ptr == NULL)
478      return;
479
480   info_ptr->scal_unit = (png_byte)unit;
481
482   length = png_strlen(swidth) + 1;
483   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
484   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
485   if (info_ptr->scal_s_width == NULL)
486   {
487      png_warning(png_ptr,
488       "Memory allocation failed while processing sCAL.");
489   }
490   png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
491
492   length = png_strlen(sheight) + 1;
493   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
494   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
495   if (info_ptr->scal_s_height == NULL)
496   {
497      png_free (png_ptr, info_ptr->scal_s_width);
498      png_warning(png_ptr,
499       "Memory allocation failed while processing sCAL.");
500   }
501   png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
502
503   info_ptr->valid |= PNG_INFO_sCAL;
504#ifdef PNG_FREE_ME_SUPPORTED
505   info_ptr->free_me |= PNG_FREE_SCAL;
506#endif
507}
508#endif
509#endif
510#endif
511
512#if defined(PNG_pHYs_SUPPORTED)
513void PNGAPI
514png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
515   png_uint_32 res_x, png_uint_32 res_y, int unit_type)
516{
517   png_debug1(1, "in %s storage function\n", "pHYs");
518   if (png_ptr == NULL || info_ptr == NULL)
519      return;
520
521   info_ptr->x_pixels_per_unit = res_x;
522   info_ptr->y_pixels_per_unit = res_y;
523   info_ptr->phys_unit_type = (png_byte)unit_type;
524   info_ptr->valid |= PNG_INFO_pHYs;
525}
526#endif
527
528void PNGAPI
529png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
530   png_colorp palette, int num_palette)
531{
532
533   png_debug1(1, "in %s storage function\n", "PLTE");
534   if (png_ptr == NULL || info_ptr == NULL)
535      return;
536
537   if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
538     {
539       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
540         png_error(png_ptr, "Invalid palette length");
541       else
542       {
543         png_warning(png_ptr, "Invalid palette length");
544         return;
545       }
546     }
547
548   /*
549    * It may not actually be necessary to set png_ptr->palette here;
550    * we do it for backward compatibility with the way the png_handle_tRNS
551    * function used to do the allocation.
552    */
553#ifdef PNG_FREE_ME_SUPPORTED
554   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
555#endif
556
557   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
558      of num_palette entries,
559      in case of an invalid PNG file that has too-large sample values. */
560   png_ptr->palette = (png_colorp)png_malloc(png_ptr,
561      PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
562   png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
563      png_sizeof(png_color));
564   png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color));
565   info_ptr->palette = png_ptr->palette;
566   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
567
568#ifdef PNG_FREE_ME_SUPPORTED
569   info_ptr->free_me |= PNG_FREE_PLTE;
570#else
571   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
572#endif
573
574   info_ptr->valid |= PNG_INFO_PLTE;
575}
576
577#if defined(PNG_sBIT_SUPPORTED)
578void PNGAPI
579png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
580   png_color_8p sig_bit)
581{
582   png_debug1(1, "in %s storage function\n", "sBIT");
583   if (png_ptr == NULL || info_ptr == NULL)
584      return;
585
586   png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof (png_color_8));
587   info_ptr->valid |= PNG_INFO_sBIT;
588}
589#endif
590
591#if defined(PNG_sRGB_SUPPORTED)
592void PNGAPI
593png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
594{
595   png_debug1(1, "in %s storage function\n", "sRGB");
596   if (png_ptr == NULL || info_ptr == NULL)
597      return;
598
599   info_ptr->srgb_intent = (png_byte)intent;
600   info_ptr->valid |= PNG_INFO_sRGB;
601}
602
603void PNGAPI
604png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
605   int intent)
606{
607#if defined(PNG_gAMA_SUPPORTED)
608#ifdef PNG_FLOATING_POINT_SUPPORTED
609   float file_gamma;
610#endif
611#ifdef PNG_FIXED_POINT_SUPPORTED
612   png_fixed_point int_file_gamma;
613#endif
614#endif
615#if defined(PNG_cHRM_SUPPORTED)
616#ifdef PNG_FLOATING_POINT_SUPPORTED
617   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
618#endif
619#ifdef PNG_FIXED_POINT_SUPPORTED
620   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
621      int_green_y, int_blue_x, int_blue_y;
622#endif
623#endif
624   png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
625   if (png_ptr == NULL || info_ptr == NULL)
626      return;
627
628   png_set_sRGB(png_ptr, info_ptr, intent);
629
630#if defined(PNG_gAMA_SUPPORTED)
631#ifdef PNG_FLOATING_POINT_SUPPORTED
632   file_gamma = (float).45455;
633   png_set_gAMA(png_ptr, info_ptr, file_gamma);
634#endif
635#ifdef PNG_FIXED_POINT_SUPPORTED
636   int_file_gamma = 45455L;
637   png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
638#endif
639#endif
640
641#if defined(PNG_cHRM_SUPPORTED)
642#ifdef PNG_FIXED_POINT_SUPPORTED
643   int_white_x = 31270L;
644   int_white_y = 32900L;
645   int_red_x   = 64000L;
646   int_red_y   = 33000L;
647   int_green_x = 30000L;
648   int_green_y = 60000L;
649   int_blue_x  = 15000L;
650   int_blue_y  =  6000L;
651
652   png_set_cHRM_fixed(png_ptr, info_ptr,
653      int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
654      int_blue_x, int_blue_y);
655#endif
656#ifdef PNG_FLOATING_POINT_SUPPORTED
657   white_x = (float).3127;
658   white_y = (float).3290;
659   red_x   = (float).64;
660   red_y   = (float).33;
661   green_x = (float).30;
662   green_y = (float).60;
663   blue_x  = (float).15;
664   blue_y  = (float).06;
665
666   png_set_cHRM(png_ptr, info_ptr,
667      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
668#endif
669#endif
670}
671#endif
672
673
674#if defined(PNG_iCCP_SUPPORTED)
675void PNGAPI
676png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
677             png_charp name, int compression_type,
678             png_charp profile, png_uint_32 proflen)
679{
680   png_charp new_iccp_name;
681   png_charp new_iccp_profile;
682
683   png_debug1(1, "in %s storage function\n", "iCCP");
684   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
685      return;
686
687   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, png_strlen(name)+1);
688   if (new_iccp_name == NULL)
689   {
690      png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
691      return;
692   }
693   png_strncpy(new_iccp_name, name, png_sizeof(new_iccp_name));
694   new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
695   if (new_iccp_profile == NULL)
696   {
697      png_free (png_ptr, new_iccp_name);
698      png_warning(png_ptr, "Insufficient memory to process iCCP profile.");
699      return;
700   }
701   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
702
703   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
704
705   info_ptr->iccp_proflen = proflen;
706   info_ptr->iccp_name = new_iccp_name;
707   info_ptr->iccp_profile = new_iccp_profile;
708   /* Compression is always zero but is here so the API and info structure
709    * does not have to change if we introduce multiple compression types */
710   info_ptr->iccp_compression = (png_byte)compression_type;
711#ifdef PNG_FREE_ME_SUPPORTED
712   info_ptr->free_me |= PNG_FREE_ICCP;
713#endif
714   info_ptr->valid |= PNG_INFO_iCCP;
715}
716#endif
717
718#if defined(PNG_TEXT_SUPPORTED)
719void PNGAPI
720png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
721   int num_text)
722{
723   int ret;
724   ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
725   if (ret)
726     png_error(png_ptr, "Insufficient memory to store text");
727}
728
729int /* PRIVATE */
730png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
731   int num_text)
732{
733   int i;
734
735   png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
736      "text" : (png_const_charp)png_ptr->chunk_name));
737
738   if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
739      return(0);
740
741   /* Make sure we have enough space in the "text" array in info_struct
742    * to hold all of the incoming text_ptr objects.
743    */
744   if (info_ptr->num_text + num_text > info_ptr->max_text)
745   {
746      if (info_ptr->text != NULL)
747      {
748         png_textp old_text;
749         int old_max;
750
751         old_max = info_ptr->max_text;
752         info_ptr->max_text = info_ptr->num_text + num_text + 8;
753         old_text = info_ptr->text;
754         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
755            (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
756         if (info_ptr->text == NULL)
757           {
758             png_free(png_ptr, old_text);
759             return(1);
760           }
761         png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
762            png_sizeof(png_text)));
763         png_free(png_ptr, old_text);
764      }
765      else
766      {
767         info_ptr->max_text = num_text + 8;
768         info_ptr->num_text = 0;
769         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
770            (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
771         if (info_ptr->text == NULL)
772           return(1);
773#ifdef PNG_FREE_ME_SUPPORTED
774         info_ptr->free_me |= PNG_FREE_TEXT;
775#endif
776      }
777      png_debug1(3, "allocated %d entries for info_ptr->text\n",
778         info_ptr->max_text);
779   }
780   for (i = 0; i < num_text; i++)
781   {
782      png_size_t text_length,key_len;
783      png_size_t lang_len,lang_key_len;
784      png_textp textp = &(info_ptr->text[info_ptr->num_text]);
785
786      if (text_ptr[i].key == NULL)
787          continue;
788
789      key_len = png_strlen(text_ptr[i].key);
790
791      if(text_ptr[i].compression <= 0)
792      {
793        lang_len = 0;
794        lang_key_len = 0;
795      }
796      else
797#ifdef PNG_iTXt_SUPPORTED
798      {
799        /* set iTXt data */
800        if (text_ptr[i].lang != NULL)
801          lang_len = png_strlen(text_ptr[i].lang);
802        else
803          lang_len = 0;
804        if (text_ptr[i].lang_key != NULL)
805          lang_key_len = png_strlen(text_ptr[i].lang_key);
806        else
807          lang_key_len = 0;
808      }
809#else
810      {
811        png_warning(png_ptr, "iTXt chunk not supported.");
812        continue;
813      }
814#endif
815
816      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
817      {
818         text_length = 0;
819#ifdef PNG_iTXt_SUPPORTED
820         if(text_ptr[i].compression > 0)
821            textp->compression = PNG_ITXT_COMPRESSION_NONE;
822         else
823#endif
824            textp->compression = PNG_TEXT_COMPRESSION_NONE;
825      }
826      else
827      {
828         text_length = png_strlen(text_ptr[i].text);
829         textp->compression = text_ptr[i].compression;
830      }
831
832      textp->key = (png_charp)png_malloc_warn(png_ptr,
833         (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
834      if (textp->key == NULL)
835        return(1);
836      png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
837         (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
838         (int)textp->key);
839
840      png_memcpy(textp->key, text_ptr[i].key,
841         (png_size_t)(key_len));
842      *(textp->key+key_len) = '\0';
843#ifdef PNG_iTXt_SUPPORTED
844      if (text_ptr[i].compression > 0)
845      {
846         textp->lang=textp->key + key_len + 1;
847         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
848         *(textp->lang+lang_len) = '\0';
849         textp->lang_key=textp->lang + lang_len + 1;
850         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
851         *(textp->lang_key+lang_key_len) = '\0';
852         textp->text=textp->lang_key + lang_key_len + 1;
853      }
854      else
855#endif
856      {
857#ifdef PNG_iTXt_SUPPORTED
858         textp->lang=NULL;
859         textp->lang_key=NULL;
860#endif
861         textp->text=textp->key + key_len + 1;
862      }
863      if(text_length)
864         png_memcpy(textp->text, text_ptr[i].text,
865            (png_size_t)(text_length));
866      *(textp->text+text_length) = '\0';
867
868#ifdef PNG_iTXt_SUPPORTED
869      if(textp->compression > 0)
870      {
871         textp->text_length = 0;
872         textp->itxt_length = text_length;
873      }
874      else
875#endif
876      {
877         textp->text_length = text_length;
878#ifdef PNG_iTXt_SUPPORTED
879         textp->itxt_length = 0;
880#endif
881      }
882      info_ptr->num_text++;
883      png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
884   }
885   return(0);
886}
887#endif
888
889#if defined(PNG_tIME_SUPPORTED)
890void PNGAPI
891png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
892{
893   png_debug1(1, "in %s storage function\n", "tIME");
894   if (png_ptr == NULL || info_ptr == NULL ||
895       (png_ptr->mode & PNG_WROTE_tIME))
896      return;
897
898   png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof (png_time));
899   info_ptr->valid |= PNG_INFO_tIME;
900}
901#endif
902
903#if defined(PNG_tRNS_SUPPORTED)
904void PNGAPI
905png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
906   png_bytep trans, int num_trans, png_color_16p trans_values)
907{
908   png_debug1(1, "in %s storage function\n", "tRNS");
909   if (png_ptr == NULL || info_ptr == NULL)
910      return;
911
912   if (trans != NULL)
913   {
914       /*
915        * It may not actually be necessary to set png_ptr->trans here;
916        * we do it for backward compatibility with the way the png_handle_tRNS
917        * function used to do the allocation.
918        */
919#ifdef PNG_FREE_ME_SUPPORTED
920       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
921#endif
922       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
923       png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
924           (png_uint_32)PNG_MAX_PALETTE_LENGTH);
925       if (num_trans <= PNG_MAX_PALETTE_LENGTH)
926         png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
927#ifdef PNG_FREE_ME_SUPPORTED
928       info_ptr->free_me |= PNG_FREE_TRNS;
929#else
930       png_ptr->flags |= PNG_FLAG_FREE_TRNS;
931#endif
932   }
933
934   if (trans_values != NULL)
935   {
936      png_memcpy(&(info_ptr->trans_values), trans_values,
937         png_sizeof(png_color_16));
938      if (num_trans == 0)
939        num_trans = 1;
940   }
941   info_ptr->num_trans = (png_uint_16)num_trans;
942   info_ptr->valid |= PNG_INFO_tRNS;
943}
944#endif
945
946#if defined(PNG_sPLT_SUPPORTED)
947void PNGAPI
948png_set_sPLT(png_structp png_ptr,
949             png_infop info_ptr, png_sPLT_tp entries, int nentries)
950{
951    png_sPLT_tp np;
952    int i;
953
954    if (png_ptr == NULL || info_ptr == NULL)
955       return;
956
957    np = (png_sPLT_tp)png_malloc_warn(png_ptr,
958        (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t));
959    if (np == NULL)
960    {
961      png_warning(png_ptr, "No memory for sPLT palettes.");
962      return;
963    }
964
965    png_memcpy(np, info_ptr->splt_palettes,
966           info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
967    png_free(png_ptr, info_ptr->splt_palettes);
968    info_ptr->splt_palettes=NULL;
969
970    for (i = 0; i < nentries; i++)
971    {
972        png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
973        png_sPLT_tp from = entries + i;
974
975        to->name = (png_charp)png_malloc_warn(png_ptr,
976          png_strlen(from->name) + 1);
977        if (to->name == NULL)
978        {
979           png_warning(png_ptr,
980             "Out of memory while processing sPLT chunk");
981        }
982        /* TODO: use png_malloc_warn */
983        png_strncpy(to->name, from->name, png_strlen(from->name));
984        to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
985            from->nentries * png_sizeof(png_sPLT_entry));
986        /* TODO: use png_malloc_warn */
987        png_memcpy(to->entries, from->entries,
988            from->nentries * png_sizeof(png_sPLT_entry));
989        if (to->entries == NULL)
990        {
991           png_warning(png_ptr,
992             "Out of memory while processing sPLT chunk");
993           png_free(png_ptr,to->name);
994           to->name = NULL;
995        }
996        to->nentries = from->nentries;
997        to->depth = from->depth;
998    }
999
1000    info_ptr->splt_palettes = np;
1001    info_ptr->splt_palettes_num += nentries;
1002    info_ptr->valid |= PNG_INFO_sPLT;
1003#ifdef PNG_FREE_ME_SUPPORTED
1004    info_ptr->free_me |= PNG_FREE_SPLT;
1005#endif
1006}
1007#endif /* PNG_sPLT_SUPPORTED */
1008
1009#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1010void PNGAPI
1011png_set_unknown_chunks(png_structp png_ptr,
1012   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
1013{
1014    png_unknown_chunkp np;
1015    int i;
1016
1017    if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
1018        return;
1019
1020    np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
1021        (info_ptr->unknown_chunks_num + num_unknowns) *
1022        png_sizeof(png_unknown_chunk));
1023    if (np == NULL)
1024    {
1025       png_warning(png_ptr,
1026          "Out of memory while processing unknown chunk.");
1027       return;
1028    }
1029
1030    png_memcpy(np, info_ptr->unknown_chunks,
1031           info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
1032    png_free(png_ptr, info_ptr->unknown_chunks);
1033    info_ptr->unknown_chunks=NULL;
1034
1035    for (i = 0; i < num_unknowns; i++)
1036    {
1037        png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
1038        png_unknown_chunkp from = unknowns + i;
1039
1040        png_strncpy((png_charp)to->name, (png_charp)from->name, 5);
1041        to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
1042        if (to->data == NULL)
1043        {
1044           png_warning(png_ptr,
1045              "Out of memory while processing unknown chunk.");
1046        }
1047        else
1048        {
1049           png_memcpy(to->data, from->data, from->size);
1050           to->size = from->size;
1051
1052           /* note our location in the read or write sequence */
1053           to->location = (png_byte)(png_ptr->mode & 0xff);
1054        }
1055    }
1056
1057    info_ptr->unknown_chunks = np;
1058    info_ptr->unknown_chunks_num += num_unknowns;
1059#ifdef PNG_FREE_ME_SUPPORTED
1060    info_ptr->free_me |= PNG_FREE_UNKN;
1061#endif
1062}
1063void PNGAPI
1064png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
1065   int chunk, int location)
1066{
1067   if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
1068         (int)info_ptr->unknown_chunks_num)
1069      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1070}
1071#endif
1072
1073#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
1074#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1075    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1076void PNGAPI
1077png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
1078{
1079   /* This function is deprecated in favor of png_permit_mng_features()
1080      and will be removed from libpng-1.3.0 */
1081   png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
1082   if (png_ptr == NULL)
1083      return;
1084   png_ptr->mng_features_permitted = (png_byte)
1085     ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
1086     ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
1087}
1088#endif
1089#endif
1090
1091#if defined(PNG_MNG_FEATURES_SUPPORTED)
1092png_uint_32 PNGAPI
1093png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1094{
1095   png_debug(1, "in png_permit_mng_features\n");
1096   if (png_ptr == NULL)
1097      return (png_uint_32)0;
1098   png_ptr->mng_features_permitted =
1099     (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1100   return (png_uint_32)png_ptr->mng_features_permitted;
1101}
1102#endif
1103
1104#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1105void PNGAPI
1106png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1107   chunk_list, int num_chunks)
1108{
1109    png_bytep new_list, p;
1110    int i, old_num_chunks;
1111    if (png_ptr == NULL)
1112       return;
1113    if (num_chunks == 0)
1114    {
1115      if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
1116        png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1117      else
1118        png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1119
1120      if(keep == PNG_HANDLE_CHUNK_ALWAYS)
1121        png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1122      else
1123        png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1124      return;
1125    }
1126    if (chunk_list == NULL)
1127      return;
1128    old_num_chunks=png_ptr->num_chunk_list;
1129    new_list=(png_bytep)png_malloc(png_ptr,
1130       (png_uint_32)(5*(num_chunks+old_num_chunks)));
1131    if(png_ptr->chunk_list != NULL)
1132    {
1133       png_memcpy(new_list, png_ptr->chunk_list,
1134          (png_size_t)(5*old_num_chunks));
1135       png_free(png_ptr, png_ptr->chunk_list);
1136       png_ptr->chunk_list=NULL;
1137    }
1138    png_memcpy(new_list+5*old_num_chunks, chunk_list,
1139       (png_size_t)(5*num_chunks));
1140    for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
1141       *p=(png_byte)keep;
1142    png_ptr->num_chunk_list=old_num_chunks+num_chunks;
1143    png_ptr->chunk_list=new_list;
1144#ifdef PNG_FREE_ME_SUPPORTED
1145    png_ptr->free_me |= PNG_FREE_LIST;
1146#endif
1147}
1148#endif
1149
1150#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1151void PNGAPI
1152png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1153   png_user_chunk_ptr read_user_chunk_fn)
1154{
1155   png_debug(1, "in png_set_read_user_chunk_fn\n");
1156   if (png_ptr == NULL)
1157      return;
1158   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1159   png_ptr->user_chunk_ptr = user_chunk_ptr;
1160}
1161#endif
1162
1163#if defined(PNG_INFO_IMAGE_SUPPORTED)
1164void PNGAPI
1165png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1166{
1167   png_debug1(1, "in %s storage function\n", "rows");
1168
1169   if (png_ptr == NULL || info_ptr == NULL)
1170      return;
1171
1172   if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1173      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1174   info_ptr->row_pointers = row_pointers;
1175   if(row_pointers)
1176      info_ptr->valid |= PNG_INFO_IDAT;
1177}
1178#endif
1179
1180#ifdef PNG_WRITE_SUPPORTED
1181void PNGAPI
1182png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
1183{
1184    if (png_ptr == NULL)
1185       return;
1186    if(png_ptr->zbuf)
1187       png_free(png_ptr, png_ptr->zbuf);
1188    png_ptr->zbuf_size = (png_size_t)size;
1189    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1190    png_ptr->zstream.next_out = png_ptr->zbuf;
1191    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1192}
1193#endif
1194
1195void PNGAPI
1196png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1197{
1198   if (png_ptr && info_ptr)
1199      info_ptr->valid &= ~(mask);
1200}
1201
1202
1203#ifndef PNG_1_0_X
1204#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1205/* this function was added to libpng 1.2.0 and should always exist by default */
1206void PNGAPI
1207png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1208{
1209#ifdef PNG_MMX_CODE_SUPPORTED
1210    png_uint_32 settable_asm_flags;
1211    png_uint_32 settable_mmx_flags;
1212#endif
1213    if (png_ptr == NULL)
1214       return;
1215#ifdef PNG_MMX_CODE_SUPPORTED
1216
1217    settable_mmx_flags =
1218#ifdef PNG_HAVE_MMX_COMBINE_ROW
1219                         PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
1220#endif
1221#ifdef PNG_HAVE_MMX_READ_INTERLACE
1222                         PNG_ASM_FLAG_MMX_READ_INTERLACE    |
1223#endif
1224#ifdef PNG_HAVE_MMX_READ_FILTER_ROW
1225                         PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
1226                         PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
1227                         PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
1228                         PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
1229#endif
1230                         0;
1231
1232    /* could be some non-MMX ones in the future, but not currently: */
1233    settable_asm_flags = settable_mmx_flags;
1234
1235    if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
1236        !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
1237    {
1238        /* clear all MMX flags if MMX isn't supported */
1239        settable_asm_flags &= ~settable_mmx_flags;
1240        png_ptr->asm_flags &= ~settable_mmx_flags;
1241    }
1242
1243    /* we're replacing the settable bits with those passed in by the user,
1244     * so first zero them out of the master copy, then bitwise-OR in the
1245     * allowed subset that was requested */
1246
1247    png_ptr->asm_flags &= ~settable_asm_flags;               /* zero them */
1248    png_ptr->asm_flags |= (asm_flags & settable_asm_flags);  /* set them */
1249#endif /* ?PNG_MMX_CODE_SUPPORTED */
1250}
1251
1252/* this function was added to libpng 1.2.0 */
1253void PNGAPI
1254png_set_mmx_thresholds (png_structp png_ptr,
1255                        png_byte mmx_bitdepth_threshold,
1256                        png_uint_32 mmx_rowbytes_threshold)
1257{
1258    if (png_ptr == NULL)
1259       return;
1260#ifdef PNG_MMX_CODE_SUPPORTED
1261    png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
1262    png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
1263#endif /* ?PNG_MMX_CODE_SUPPORTED */
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 */
1269void PNGAPI
1270png_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) return;
1278    png_ptr->user_width_max = user_width_max;
1279    png_ptr->user_height_max = user_height_max;
1280}
1281#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1282
1283#endif /* ?PNG_1_0_X */
1284#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
1285