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/thirdparty/libpng/pngset.c

http://crashrpt.googlecode.com/
C | 1219 lines | 1034 code | 122 blank | 63 comment | 268 complexity | d085639e21c2f196d18089e8f379dc96 MD5 | raw file
   1
   2/* pngset.c - storage of image information into info struct
   3 *
   4 * libpng 1.2.7 - September 12, 2004
   5 * For conditions of distribution and use, see copyright notice in png.h
   6 * Copyright (c) 1998-2004 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_bKGD_SUPPORTED)
  20void PNGAPI
  21png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
  22{
  23   png_debug1(1, "in %s storage function\n", "bKGD");
  24   if (png_ptr == NULL || info_ptr == NULL)
  25      return;
  26
  27   png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
  28   info_ptr->valid |= PNG_INFO_bKGD;
  29}
  30#endif
  31
  32#if defined(PNG_cHRM_SUPPORTED)
  33#ifdef PNG_FLOATING_POINT_SUPPORTED
  34void PNGAPI
  35png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
  36   double white_x, double white_y, double red_x, double red_y,
  37   double green_x, double green_y, double blue_x, double blue_y)
  38{
  39   png_debug1(1, "in %s storage function\n", "cHRM");
  40   if (png_ptr == NULL || info_ptr == NULL)
  41      return;
  42
  43   if (white_x < 0.0 || white_y < 0.0 ||
  44         red_x < 0.0 ||   red_y < 0.0 ||
  45       green_x < 0.0 || green_y < 0.0 ||
  46        blue_x < 0.0 ||  blue_y < 0.0)
  47   {
  48      png_warning(png_ptr,
  49        "Ignoring attempt to set negative chromaticity value");
  50      return;
  51   }
  52   if (white_x > 21474.83 || white_y > 21474.83 ||
  53         red_x > 21474.83 ||   red_y > 21474.83 ||
  54       green_x > 21474.83 || green_y > 21474.83 ||
  55        blue_x > 21474.83 ||  blue_y > 21474.83)
  56   {
  57      png_warning(png_ptr,
  58        "Ignoring attempt to set chromaticity value exceeding 21474.83");
  59      return;
  60   }
  61
  62   info_ptr->x_white = (float)white_x;
  63   info_ptr->y_white = (float)white_y;
  64   info_ptr->x_red   = (float)red_x;
  65   info_ptr->y_red   = (float)red_y;
  66   info_ptr->x_green = (float)green_x;
  67   info_ptr->y_green = (float)green_y;
  68   info_ptr->x_blue  = (float)blue_x;
  69   info_ptr->y_blue  = (float)blue_y;
  70#ifdef PNG_FIXED_POINT_SUPPORTED
  71   info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
  72   info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
  73   info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000.+0.5);
  74   info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000.+0.5);
  75   info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
  76   info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
  77   info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000.+0.5);
  78   info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000.+0.5);
  79#endif
  80   info_ptr->valid |= PNG_INFO_cHRM;
  81}
  82#endif
  83#ifdef PNG_FIXED_POINT_SUPPORTED
  84void PNGAPI
  85png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
  86   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
  87   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
  88   png_fixed_point blue_x, png_fixed_point blue_y)
  89{
  90   png_debug1(1, "in %s storage function\n", "cHRM");
  91   if (png_ptr == NULL || info_ptr == NULL)
  92      return;
  93
  94   if (white_x < 0 || white_y < 0 ||
  95         red_x < 0 ||   red_y < 0 ||
  96       green_x < 0 || green_y < 0 ||
  97        blue_x < 0 ||  blue_y < 0)
  98   {
  99      png_warning(png_ptr,
 100        "Ignoring attempt to set negative chromaticity value");
 101      return;
 102   }
 103   if (white_x > (double) PNG_UINT_31_MAX ||
 104       white_y > (double) PNG_UINT_31_MAX ||
 105         red_x > (double) PNG_UINT_31_MAX ||
 106         red_y > (double) PNG_UINT_31_MAX ||
 107       green_x > (double) PNG_UINT_31_MAX ||
 108       green_y > (double) PNG_UINT_31_MAX ||
 109        blue_x > (double) PNG_UINT_31_MAX ||
 110        blue_y > (double) PNG_UINT_31_MAX)
 111   {
 112      png_warning(png_ptr,
 113        "Ignoring attempt to set chromaticity value exceeding 21474.83");
 114      return;
 115   }
 116   info_ptr->int_x_white = white_x;
 117   info_ptr->int_y_white = white_y;
 118   info_ptr->int_x_red   = red_x;
 119   info_ptr->int_y_red   = red_y;
 120   info_ptr->int_x_green = green_x;
 121   info_ptr->int_y_green = green_y;
 122   info_ptr->int_x_blue  = blue_x;
 123   info_ptr->int_y_blue  = blue_y;
 124#ifdef PNG_FLOATING_POINT_SUPPORTED
 125   info_ptr->x_white = (float)(white_x/100000.);
 126   info_ptr->y_white = (float)(white_y/100000.);
 127   info_ptr->x_red   = (float)(  red_x/100000.);
 128   info_ptr->y_red   = (float)(  red_y/100000.);
 129   info_ptr->x_green = (float)(green_x/100000.);
 130   info_ptr->y_green = (float)(green_y/100000.);
 131   info_ptr->x_blue  = (float)( blue_x/100000.);
 132   info_ptr->y_blue  = (float)( blue_y/100000.);
 133#endif
 134   info_ptr->valid |= PNG_INFO_cHRM;
 135}
 136#endif
 137#endif
 138
 139#if defined(PNG_gAMA_SUPPORTED)
 140#ifdef PNG_FLOATING_POINT_SUPPORTED
 141void PNGAPI
 142png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
 143{
 144   double gamma;
 145   png_debug1(1, "in %s storage function\n", "gAMA");
 146   if (png_ptr == NULL || info_ptr == NULL)
 147      return;
 148
 149   /* Check for overflow */
 150   if (file_gamma > 21474.83)
 151   {
 152      png_warning(png_ptr, "Limiting gamma to 21474.83");
 153      gamma=21474.83;
 154   }
 155   else
 156      gamma=file_gamma;
 157   info_ptr->gamma = (float)gamma;
 158#ifdef PNG_FIXED_POINT_SUPPORTED
 159   info_ptr->int_gamma = (int)(gamma*100000.+.5);
 160#endif
 161   info_ptr->valid |= PNG_INFO_gAMA;
 162   if(gamma == 0.0)
 163      png_warning(png_ptr, "Setting gamma=0");
 164}
 165#endif
 166void PNGAPI
 167png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
 168   int_gamma)
 169{
 170   png_fixed_point gamma;
 171
 172   png_debug1(1, "in %s storage function\n", "gAMA");
 173   if (png_ptr == NULL || info_ptr == NULL)
 174      return;
 175
 176   if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
 177   {
 178     png_warning(png_ptr, "Limiting gamma to 21474.83");
 179     gamma=PNG_UINT_31_MAX;
 180   }
 181   else
 182   {
 183     if (int_gamma < 0)
 184     {
 185       png_warning(png_ptr, "Setting negative gamma to zero");
 186       gamma=0;
 187     }
 188     else
 189       gamma=int_gamma;
 190   }
 191#ifdef PNG_FLOATING_POINT_SUPPORTED
 192   info_ptr->gamma = (float)(gamma/100000.);
 193#endif
 194#ifdef PNG_FIXED_POINT_SUPPORTED
 195   info_ptr->int_gamma = gamma;
 196#endif
 197   info_ptr->valid |= PNG_INFO_gAMA;
 198   if(gamma == 0)
 199      png_warning(png_ptr, "Setting gamma=0");
 200}
 201#endif
 202
 203#if defined(PNG_hIST_SUPPORTED)
 204void PNGAPI
 205png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
 206{
 207   int i;
 208
 209   png_debug1(1, "in %s storage function\n", "hIST");
 210   if (png_ptr == NULL || info_ptr == NULL)
 211      return;
 212   if (info_ptr->num_palette == 0)
 213   {
 214       png_warning(png_ptr,
 215          "Palette size 0, hIST allocation skipped.");
 216       return;
 217   }
 218
 219#ifdef PNG_FREE_ME_SUPPORTED
 220   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
 221#endif
 222   /* Changed from info->num_palette to 256 in version 1.2.1 */
 223   png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
 224      (png_uint_32)(256 * png_sizeof (png_uint_16)));
 225   if (png_ptr->hist == NULL)
 226     {
 227       png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
 228       return;
 229     }
 230
 231   for (i = 0; i < info_ptr->num_palette; i++)
 232       png_ptr->hist[i] = hist[i];
 233   info_ptr->hist = png_ptr->hist;
 234   info_ptr->valid |= PNG_INFO_hIST;
 235
 236#ifdef PNG_FREE_ME_SUPPORTED
 237   info_ptr->free_me |= PNG_FREE_HIST;
 238#else
 239   png_ptr->flags |= PNG_FLAG_FREE_HIST;
 240#endif
 241}
 242#endif
 243
 244void PNGAPI
 245png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
 246   png_uint_32 width, png_uint_32 height, int bit_depth,
 247   int color_type, int interlace_type, int compression_type,
 248   int filter_type)
 249{
 250   png_debug1(1, "in %s storage function\n", "IHDR");
 251   if (png_ptr == NULL || info_ptr == NULL)
 252      return;
 253
 254   /* check for width and height valid values */
 255   if (width == 0 || height == 0)
 256      png_error(png_ptr, "Image width or height is zero in IHDR");
 257#ifdef PNG_SET_USER_LIMITS_SUPPORTED
 258   if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
 259      png_error(png_ptr, "image size exceeds user limits in IHDR");
 260#else
 261   if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
 262      png_error(png_ptr, "image size exceeds user limits in IHDR");
 263#endif
 264   if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
 265      png_error(png_ptr, "Invalid image size in IHDR");
 266   if ( width > (PNG_UINT_32_MAX
 267                 >> 3)      /* 8-byte RGBA pixels */
 268                 - 64       /* bigrowbuf hack */
 269                 - 1        /* filter byte */
 270                 - 7*8      /* rounding of width to multiple of 8 pixels */
 271                 - 8)       /* extra max_pixel_depth pad */
 272      png_warning(png_ptr, "Width is too large for libpng to process pixels");
 273
 274   /* check other values */
 275   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
 276      bit_depth != 8 && bit_depth != 16)
 277      png_error(png_ptr, "Invalid bit depth in IHDR");
 278
 279   if (color_type < 0 || color_type == 1 ||
 280      color_type == 5 || color_type > 6)
 281      png_error(png_ptr, "Invalid color type in IHDR");
 282
 283   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
 284       ((color_type == PNG_COLOR_TYPE_RGB ||
 285         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
 286         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
 287      png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
 288
 289   if (interlace_type >= PNG_INTERLACE_LAST)
 290      png_error(png_ptr, "Unknown interlace method in IHDR");
 291
 292   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
 293      png_error(png_ptr, "Unknown compression method in IHDR");
 294
 295#if defined(PNG_MNG_FEATURES_SUPPORTED)
 296   /* Accept filter_method 64 (intrapixel differencing) only if
 297    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
 298    * 2. Libpng did not read a PNG signature (this filter_method is only
 299    *    used in PNG datastreams that are embedded in MNG datastreams) and
 300    * 3. The application called png_permit_mng_features with a mask that
 301    *    included PNG_FLAG_MNG_FILTER_64 and
 302    * 4. The filter_method is 64 and
 303    * 5. The color_type is RGB or RGBA
 304    */
 305   if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
 306      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
 307   if(filter_type != PNG_FILTER_TYPE_BASE)
 308   {
 309     if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
 310        (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
 311        ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
 312        (color_type == PNG_COLOR_TYPE_RGB || 
 313         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
 314        png_error(png_ptr, "Unknown filter method in IHDR");
 315     if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
 316        png_warning(png_ptr, "Invalid filter method in IHDR");
 317   }
 318#else
 319   if(filter_type != PNG_FILTER_TYPE_BASE)
 320      png_error(png_ptr, "Unknown filter method in IHDR");
 321#endif
 322
 323   info_ptr->width = width;
 324   info_ptr->height = height;
 325   info_ptr->bit_depth = (png_byte)bit_depth;
 326   info_ptr->color_type =(png_byte) color_type;
 327   info_ptr->compression_type = (png_byte)compression_type;
 328   info_ptr->filter_type = (png_byte)filter_type;
 329   info_ptr->interlace_type = (png_byte)interlace_type;
 330   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
 331      info_ptr->channels = 1;
 332   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
 333      info_ptr->channels = 3;
 334   else
 335      info_ptr->channels = 1;
 336   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
 337      info_ptr->channels++;
 338   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
 339
 340   /* check for potential overflow */
 341   if ( width > (PNG_UINT_32_MAX
 342                 >> 3)      /* 8-byte RGBA pixels */
 343                 - 64       /* bigrowbuf hack */
 344                 - 1        /* filter byte */
 345                 - 7*8      /* rounding of width to multiple of 8 pixels */
 346                 - 8)       /* extra max_pixel_depth pad */
 347      info_ptr->rowbytes = (png_size_t)0;
 348   else
 349      info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width);
 350}
 351
 352#if defined(PNG_oFFs_SUPPORTED)
 353void PNGAPI
 354png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
 355   png_int_32 offset_x, png_int_32 offset_y, int unit_type)
 356{
 357   png_debug1(1, "in %s storage function\n", "oFFs");
 358   if (png_ptr == NULL || info_ptr == NULL)
 359      return;
 360
 361   info_ptr->x_offset = offset_x;
 362   info_ptr->y_offset = offset_y;
 363   info_ptr->offset_unit_type = (png_byte)unit_type;
 364   info_ptr->valid |= PNG_INFO_oFFs;
 365}
 366#endif
 367
 368#if defined(PNG_pCAL_SUPPORTED)
 369void PNGAPI
 370png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
 371   png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
 372   png_charp units, png_charpp params)
 373{
 374   png_uint_32 length;
 375   int i;
 376
 377   png_debug1(1, "in %s storage function\n", "pCAL");
 378   if (png_ptr == NULL || info_ptr == NULL)
 379      return;
 380
 381   length = png_strlen(purpose) + 1;
 382   png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
 383   info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
 384   if (info_ptr->pcal_purpose == NULL)
 385     {
 386       png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
 387       return;
 388     }
 389   png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
 390
 391   png_debug(3, "storing X0, X1, type, and nparams in info\n");
 392   info_ptr->pcal_X0 = X0;
 393   info_ptr->pcal_X1 = X1;
 394   info_ptr->pcal_type = (png_byte)type;
 395   info_ptr->pcal_nparams = (png_byte)nparams;
 396
 397   length = png_strlen(units) + 1;
 398   png_debug1(3, "allocating units for info (%lu bytes)\n", length);
 399   info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
 400   if (info_ptr->pcal_units == NULL)
 401     {
 402       png_warning(png_ptr, "Insufficient memory for pCAL units.");
 403       return;
 404     }
 405   png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
 406
 407   info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
 408      (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
 409   if (info_ptr->pcal_params == NULL)
 410     {
 411       png_warning(png_ptr, "Insufficient memory for pCAL params.");
 412       return;
 413     }
 414
 415   info_ptr->pcal_params[nparams] = NULL;
 416
 417   for (i = 0; i < nparams; i++)
 418   {
 419      length = png_strlen(params[i]) + 1;
 420      png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
 421      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
 422      if (info_ptr->pcal_params[i] == NULL)
 423        {
 424          png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
 425          return;
 426        }
 427      png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
 428   }
 429
 430   info_ptr->valid |= PNG_INFO_pCAL;
 431#ifdef PNG_FREE_ME_SUPPORTED
 432   info_ptr->free_me |= PNG_FREE_PCAL;
 433#endif
 434}
 435#endif
 436
 437#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
 438#ifdef PNG_FLOATING_POINT_SUPPORTED
 439void PNGAPI
 440png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
 441             int unit, double width, double height)
 442{
 443   png_debug1(1, "in %s storage function\n", "sCAL");
 444   if (png_ptr == NULL || info_ptr == NULL)
 445      return;
 446
 447   info_ptr->scal_unit = (png_byte)unit;
 448   info_ptr->scal_pixel_width = width;
 449   info_ptr->scal_pixel_height = height;
 450
 451   info_ptr->valid |= PNG_INFO_sCAL;
 452}
 453#else
 454#ifdef PNG_FIXED_POINT_SUPPORTED
 455void PNGAPI
 456png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
 457             int unit, png_charp swidth, png_charp sheight)
 458{
 459   png_uint_32 length;
 460
 461   png_debug1(1, "in %s storage function\n", "sCAL");
 462   if (png_ptr == NULL || info_ptr == NULL)
 463      return;
 464
 465   info_ptr->scal_unit = (png_byte)unit;
 466
 467   length = png_strlen(swidth) + 1;
 468   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
 469   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
 470   if (info_ptr->scal_s_width == NULL)
 471   {
 472      png_warning(png_ptr, "Memory allocation failed while processing sCAL.");
 473   }
 474   png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
 475
 476   length = png_strlen(sheight) + 1;
 477   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
 478   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
 479   if (info_ptr->scal_s_height == NULL)
 480   {
 481      png_free (png_ptr, info_ptr->scal_s_width);
 482      png_warning(png_ptr, "Memory allocation failed while processing sCAL.");
 483   }
 484   png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
 485
 486   info_ptr->valid |= PNG_INFO_sCAL;
 487#ifdef PNG_FREE_ME_SUPPORTED
 488   info_ptr->free_me |= PNG_FREE_SCAL;
 489#endif
 490}
 491#endif
 492#endif
 493#endif
 494
 495#if defined(PNG_pHYs_SUPPORTED)
 496void PNGAPI
 497png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
 498   png_uint_32 res_x, png_uint_32 res_y, int unit_type)
 499{
 500   png_debug1(1, "in %s storage function\n", "pHYs");
 501   if (png_ptr == NULL || info_ptr == NULL)
 502      return;
 503
 504   info_ptr->x_pixels_per_unit = res_x;
 505   info_ptr->y_pixels_per_unit = res_y;
 506   info_ptr->phys_unit_type = (png_byte)unit_type;
 507   info_ptr->valid |= PNG_INFO_pHYs;
 508}
 509#endif
 510
 511void PNGAPI
 512png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
 513   png_colorp palette, int num_palette)
 514{
 515
 516   png_debug1(1, "in %s storage function\n", "PLTE");
 517   if (png_ptr == NULL || info_ptr == NULL)
 518      return;
 519
 520   /*
 521    * It may not actually be necessary to set png_ptr->palette here;
 522    * we do it for backward compatibility with the way the png_handle_tRNS
 523    * function used to do the allocation.
 524    */
 525#ifdef PNG_FREE_ME_SUPPORTED
 526   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
 527#endif
 528
 529   /* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
 530      in case of an invalid PNG file that has too-large sample values. */
 531   png_ptr->palette = (png_colorp)png_malloc(png_ptr,
 532      256 * png_sizeof(png_color));
 533   png_memset(png_ptr->palette, 0, 256 * png_sizeof(png_color));
 534   png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color));
 535   info_ptr->palette = png_ptr->palette;
 536   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
 537
 538#ifdef PNG_FREE_ME_SUPPORTED
 539   info_ptr->free_me |= PNG_FREE_PLTE;
 540#else
 541   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
 542#endif
 543
 544   info_ptr->valid |= PNG_INFO_PLTE;
 545}
 546
 547#if defined(PNG_sBIT_SUPPORTED)
 548void PNGAPI
 549png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
 550   png_color_8p sig_bit)
 551{
 552   png_debug1(1, "in %s storage function\n", "sBIT");
 553   if (png_ptr == NULL || info_ptr == NULL)
 554      return;
 555
 556   png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof (png_color_8));
 557   info_ptr->valid |= PNG_INFO_sBIT;
 558}
 559#endif
 560
 561#if defined(PNG_sRGB_SUPPORTED)
 562void PNGAPI
 563png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
 564{
 565   png_debug1(1, "in %s storage function\n", "sRGB");
 566   if (png_ptr == NULL || info_ptr == NULL)
 567      return;
 568
 569   info_ptr->srgb_intent = (png_byte)intent;
 570   info_ptr->valid |= PNG_INFO_sRGB;
 571}
 572
 573void PNGAPI
 574png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 575   int intent)
 576{
 577#if defined(PNG_gAMA_SUPPORTED)
 578#ifdef PNG_FLOATING_POINT_SUPPORTED
 579   float file_gamma;
 580#endif
 581#ifdef PNG_FIXED_POINT_SUPPORTED
 582   png_fixed_point int_file_gamma;
 583#endif
 584#endif
 585#if defined(PNG_cHRM_SUPPORTED)
 586#ifdef PNG_FLOATING_POINT_SUPPORTED
 587   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
 588#endif
 589#ifdef PNG_FIXED_POINT_SUPPORTED
 590   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
 591      int_green_y, int_blue_x, int_blue_y;
 592#endif
 593#endif
 594   png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
 595   if (png_ptr == NULL || info_ptr == NULL)
 596      return;
 597
 598   png_set_sRGB(png_ptr, info_ptr, intent);
 599
 600#if defined(PNG_gAMA_SUPPORTED)
 601#ifdef PNG_FLOATING_POINT_SUPPORTED
 602   file_gamma = (float).45455;
 603   png_set_gAMA(png_ptr, info_ptr, file_gamma);
 604#endif
 605#ifdef PNG_FIXED_POINT_SUPPORTED
 606   int_file_gamma = 45455L;
 607   png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
 608#endif
 609#endif
 610
 611#if defined(PNG_cHRM_SUPPORTED)
 612#ifdef PNG_FIXED_POINT_SUPPORTED
 613   int_white_x = 31270L;
 614   int_white_y = 32900L;
 615   int_red_x   = 64000L;
 616   int_red_y   = 33000L;
 617   int_green_x = 30000L;
 618   int_green_y = 60000L;
 619   int_blue_x  = 15000L;
 620   int_blue_y  =  6000L;
 621
 622   png_set_cHRM_fixed(png_ptr, info_ptr,
 623      int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
 624      int_blue_x, int_blue_y);
 625#endif
 626#ifdef PNG_FLOATING_POINT_SUPPORTED
 627   white_x = (float).3127;
 628   white_y = (float).3290;
 629   red_x   = (float).64;
 630   red_y   = (float).33;
 631   green_x = (float).30;
 632   green_y = (float).60;
 633   blue_x  = (float).15;
 634   blue_y  = (float).06;
 635
 636   png_set_cHRM(png_ptr, info_ptr,
 637      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
 638#endif
 639#endif
 640}
 641#endif
 642
 643
 644#if defined(PNG_iCCP_SUPPORTED)
 645void PNGAPI
 646png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
 647             png_charp name, int compression_type,
 648             png_charp profile, png_uint_32 proflen)
 649{
 650   png_charp new_iccp_name;
 651   png_charp new_iccp_profile;
 652
 653   png_debug1(1, "in %s storage function\n", "iCCP");
 654   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
 655      return;
 656
 657   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, png_strlen(name)+1);
 658   if (new_iccp_name == NULL)
 659   {
 660      png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
 661      return;
 662   }
 663   png_strcpy(new_iccp_name, name);
 664   new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
 665   if (new_iccp_profile == NULL)
 666   {
 667      png_free (png_ptr, new_iccp_name);
 668      png_warning(png_ptr, "Insufficient memory to process iCCP profile.");
 669      return;
 670   }
 671   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
 672
 673   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
 674
 675   info_ptr->iccp_proflen = proflen;
 676   info_ptr->iccp_name = new_iccp_name;
 677   info_ptr->iccp_profile = new_iccp_profile;
 678   /* Compression is always zero but is here so the API and info structure
 679    * does not have to change if we introduce multiple compression types */
 680   info_ptr->iccp_compression = (png_byte)compression_type;
 681#ifdef PNG_FREE_ME_SUPPORTED
 682   info_ptr->free_me |= PNG_FREE_ICCP;
 683#endif
 684   info_ptr->valid |= PNG_INFO_iCCP;
 685}
 686#endif
 687
 688#if defined(PNG_TEXT_SUPPORTED)
 689void PNGAPI
 690png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 691   int num_text)
 692{
 693   int ret;
 694   ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
 695   if (ret)
 696     png_error(png_ptr, "Insufficient memory to store text");
 697}
 698
 699int /* PRIVATE */
 700png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 701   int num_text)
 702{
 703   int i;
 704
 705   png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
 706      "text" : (png_const_charp)png_ptr->chunk_name));
 707
 708   if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
 709      return(0);
 710
 711   /* Make sure we have enough space in the "text" array in info_struct
 712    * to hold all of the incoming text_ptr objects.
 713    */
 714   if (info_ptr->num_text + num_text > info_ptr->max_text)
 715   {
 716      if (info_ptr->text != NULL)
 717      {
 718         png_textp old_text;
 719         int old_max;
 720
 721         old_max = info_ptr->max_text;
 722         info_ptr->max_text = info_ptr->num_text + num_text + 8;
 723         old_text = info_ptr->text;
 724         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
 725            (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
 726         if (info_ptr->text == NULL)
 727           {
 728             png_free(png_ptr, old_text);
 729             return(1);
 730           }
 731         png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
 732            png_sizeof(png_text)));
 733         png_free(png_ptr, old_text);
 734      }
 735      else
 736      {
 737         info_ptr->max_text = num_text + 8;
 738         info_ptr->num_text = 0;
 739         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
 740            (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
 741         if (info_ptr->text == NULL)
 742           return(1);
 743#ifdef PNG_FREE_ME_SUPPORTED
 744         info_ptr->free_me |= PNG_FREE_TEXT;
 745#endif
 746      }
 747      png_debug1(3, "allocated %d entries for info_ptr->text\n",
 748         info_ptr->max_text);
 749   }
 750   for (i = 0; i < num_text; i++)
 751   {
 752      png_size_t text_length,key_len;
 753      png_size_t lang_len,lang_key_len;
 754      png_textp textp = &(info_ptr->text[info_ptr->num_text]);
 755
 756      if (text_ptr[i].key == NULL)
 757          continue;
 758
 759      key_len = png_strlen(text_ptr[i].key);
 760
 761      if(text_ptr[i].compression <= 0)
 762      {
 763        lang_len = 0;
 764        lang_key_len = 0;
 765      }
 766      else
 767#ifdef PNG_iTXt_SUPPORTED
 768      {
 769        /* set iTXt data */
 770        if (text_ptr[i].lang != NULL)
 771          lang_len = png_strlen(text_ptr[i].lang);
 772        else
 773          lang_len = 0;
 774        if (text_ptr[i].lang_key != NULL)
 775          lang_key_len = png_strlen(text_ptr[i].lang_key);
 776        else
 777          lang_key_len = 0;
 778      }
 779#else
 780      {
 781        png_warning(png_ptr, "iTXt chunk not supported.");
 782        continue;
 783      }
 784#endif
 785
 786      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
 787      {
 788         text_length = 0;
 789#ifdef PNG_iTXt_SUPPORTED
 790         if(text_ptr[i].compression > 0)
 791            textp->compression = PNG_ITXT_COMPRESSION_NONE;
 792         else
 793#endif
 794            textp->compression = PNG_TEXT_COMPRESSION_NONE;
 795      }
 796      else
 797      {
 798         text_length = png_strlen(text_ptr[i].text);
 799         textp->compression = text_ptr[i].compression;
 800      }
 801
 802      textp->key = (png_charp)png_malloc_warn(png_ptr,
 803         (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
 804      if (textp->key == NULL)
 805        return(1);
 806      png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
 807         (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
 808         (int)textp->key);
 809
 810      png_memcpy(textp->key, text_ptr[i].key,
 811         (png_size_t)(key_len));
 812      *(textp->key+key_len) = '\0';
 813#ifdef PNG_iTXt_SUPPORTED
 814      if (text_ptr[i].compression > 0)
 815      {
 816         textp->lang=textp->key + key_len + 1;
 817         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
 818         *(textp->lang+lang_len) = '\0';
 819         textp->lang_key=textp->lang + lang_len + 1;
 820         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
 821         *(textp->lang_key+lang_key_len) = '\0';
 822         textp->text=textp->lang_key + lang_key_len + 1;
 823      }
 824      else
 825#endif
 826      {
 827#ifdef PNG_iTXt_SUPPORTED
 828         textp->lang=NULL;
 829         textp->lang_key=NULL;
 830#endif
 831         textp->text=textp->key + key_len + 1;
 832      }
 833      if(text_length)
 834         png_memcpy(textp->text, text_ptr[i].text,
 835            (png_size_t)(text_length));
 836      *(textp->text+text_length) = '\0';
 837
 838#ifdef PNG_iTXt_SUPPORTED
 839      if(textp->compression > 0)
 840      {
 841         textp->text_length = 0;
 842         textp->itxt_length = text_length;
 843      }
 844      else
 845#endif
 846      {
 847         textp->text_length = text_length;
 848#ifdef PNG_iTXt_SUPPORTED
 849         textp->itxt_length = 0;
 850#endif
 851      }
 852      info_ptr->text[info_ptr->num_text]= *textp;
 853      info_ptr->num_text++;
 854      png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
 855   }
 856   return(0);
 857}
 858#endif
 859
 860#if defined(PNG_tIME_SUPPORTED)
 861void PNGAPI
 862png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
 863{
 864   png_debug1(1, "in %s storage function\n", "tIME");
 865   if (png_ptr == NULL || info_ptr == NULL ||
 866       (png_ptr->mode & PNG_WROTE_tIME))
 867      return;
 868
 869   png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof (png_time));
 870   info_ptr->valid |= PNG_INFO_tIME;
 871}
 872#endif
 873
 874#if defined(PNG_tRNS_SUPPORTED)
 875void PNGAPI
 876png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
 877   png_bytep trans, int num_trans, png_color_16p trans_values)
 878{
 879   png_debug1(1, "in %s storage function\n", "tRNS");
 880   if (png_ptr == NULL || info_ptr == NULL)
 881      return;
 882
 883   if (trans != NULL)
 884   {
 885       /*
 886        * It may not actually be necessary to set png_ptr->trans here;
 887        * we do it for backward compatibility with the way the png_handle_tRNS
 888        * function used to do the allocation.
 889        */
 890#ifdef PNG_FREE_ME_SUPPORTED
 891       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
 892#endif
 893       /* Changed from num_trans to 256 in version 1.2.1 */
 894       png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
 895           (png_uint_32)256);
 896       png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
 897#ifdef PNG_FREE_ME_SUPPORTED
 898       info_ptr->free_me |= PNG_FREE_TRNS;
 899#else
 900       png_ptr->flags |= PNG_FLAG_FREE_TRNS;
 901#endif
 902   }
 903
 904   if (trans_values != NULL)
 905   {
 906      png_memcpy(&(info_ptr->trans_values), trans_values,
 907         png_sizeof(png_color_16));
 908      if (num_trans == 0)
 909        num_trans = 1;
 910   }
 911   info_ptr->num_trans = (png_uint_16)num_trans;
 912   info_ptr->valid |= PNG_INFO_tRNS;
 913}
 914#endif
 915
 916#if defined(PNG_sPLT_SUPPORTED)
 917void PNGAPI
 918png_set_sPLT(png_structp png_ptr,
 919             png_infop info_ptr, png_sPLT_tp entries, int nentries)
 920{
 921    png_sPLT_tp np;
 922    int i;
 923
 924    np = (png_sPLT_tp)png_malloc_warn(png_ptr,
 925        (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t));
 926    if (np == NULL)
 927    {
 928      png_warning(png_ptr, "No memory for sPLT palettes.");
 929      return;
 930    }
 931
 932    png_memcpy(np, info_ptr->splt_palettes,
 933           info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
 934    png_free(png_ptr, info_ptr->splt_palettes);
 935    info_ptr->splt_palettes=NULL;
 936
 937    for (i = 0; i < nentries; i++)
 938    {
 939        png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
 940        png_sPLT_tp from = entries + i;
 941
 942        to->name = (png_charp)png_malloc(png_ptr,
 943            png_strlen(from->name) + 1);
 944        /* TODO: use png_malloc_warn */
 945        png_strcpy(to->name, from->name);
 946        to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
 947            from->nentries * png_sizeof(png_sPLT_t));
 948        /* TODO: use png_malloc_warn */
 949        png_memcpy(to->entries, from->entries,
 950            from->nentries * png_sizeof(png_sPLT_t));
 951        to->nentries = from->nentries;
 952        to->depth = from->depth;
 953    }
 954
 955    info_ptr->splt_palettes = np;
 956    info_ptr->splt_palettes_num += nentries;
 957    info_ptr->valid |= PNG_INFO_sPLT;
 958#ifdef PNG_FREE_ME_SUPPORTED
 959    info_ptr->free_me |= PNG_FREE_SPLT;
 960#endif
 961}
 962#endif /* PNG_sPLT_SUPPORTED */
 963
 964#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 965void PNGAPI
 966png_set_unknown_chunks(png_structp png_ptr,
 967   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
 968{
 969    png_unknown_chunkp np;
 970    int i;
 971
 972    if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
 973        return;
 974
 975    np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
 976        (info_ptr->unknown_chunks_num + num_unknowns) *
 977        png_sizeof(png_unknown_chunk));
 978    if (np == NULL)
 979    {
 980       png_warning(png_ptr, "Out of memory while processing unknown chunk.");
 981       return;
 982    }
 983
 984    png_memcpy(np, info_ptr->unknown_chunks,
 985           info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
 986    png_free(png_ptr, info_ptr->unknown_chunks);
 987    info_ptr->unknown_chunks=NULL;
 988
 989    for (i = 0; i < num_unknowns; i++)
 990    {
 991        png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
 992        png_unknown_chunkp from = unknowns + i;
 993
 994        png_strncpy((png_charp)to->name, (png_charp)from->name, 5);
 995        to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
 996        if (to->data == NULL)
 997        {
 998           png_warning(png_ptr, "Out of memory processing unknown chunk.");
 999        }
1000        else
1001        {
1002           png_memcpy(to->data, from->data, from->size);
1003           to->size = from->size;
1004
1005           /* note our location in the read or write sequence */
1006           to->location = (png_byte)(png_ptr->mode & 0xff);
1007        }
1008    }
1009
1010    info_ptr->unknown_chunks = np;
1011    info_ptr->unknown_chunks_num += num_unknowns;
1012#ifdef PNG_FREE_ME_SUPPORTED
1013    info_ptr->free_me |= PNG_FREE_UNKN;
1014#endif
1015}
1016void PNGAPI
1017png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
1018   int chunk, int location)
1019{
1020   if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
1021         (int)info_ptr->unknown_chunks_num)
1022      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
1023}
1024#endif
1025
1026#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1027    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1028void PNGAPI
1029png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
1030{
1031   /* This function is deprecated in favor of png_permit_mng_features()
1032      and will be removed from libpng-2.0.0 */
1033   png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
1034   if (png_ptr == NULL)
1035      return;
1036   png_ptr->mng_features_permitted = (png_byte)
1037     ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
1038     ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
1039}
1040#endif
1041
1042#if defined(PNG_MNG_FEATURES_SUPPORTED)
1043png_uint_32 PNGAPI
1044png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
1045{
1046   png_debug(1, "in png_permit_mng_features\n");
1047   if (png_ptr == NULL)
1048      return (png_uint_32)0;
1049   png_ptr->mng_features_permitted =
1050     (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
1051   return (png_uint_32)png_ptr->mng_features_permitted;
1052}
1053#endif
1054
1055#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1056void PNGAPI
1057png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
1058   chunk_list, int num_chunks)
1059{
1060    png_bytep new_list, p;
1061    int i, old_num_chunks;
1062    if (num_chunks == 0)
1063    {
1064      if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
1065        png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1066      else
1067        png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
1068
1069      if(keep == PNG_HANDLE_CHUNK_ALWAYS)
1070        png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1071      else
1072        png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
1073      return;
1074    }
1075    if (chunk_list == NULL)
1076      return;
1077    old_num_chunks=png_ptr->num_chunk_list;
1078    new_list=(png_bytep)png_malloc(png_ptr,
1079       (png_uint_32)(5*(num_chunks+old_num_chunks)));
1080    if(png_ptr->chunk_list != NULL)
1081    {
1082       png_memcpy(new_list, png_ptr->chunk_list,
1083          (png_size_t)(5*old_num_chunks));
1084       png_free(png_ptr, png_ptr->chunk_list);
1085       png_ptr->chunk_list=NULL;
1086    }
1087    png_memcpy(new_list+5*old_num_chunks, chunk_list,
1088       (png_size_t)(5*num_chunks));
1089    for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
1090       *p=(png_byte)keep;
1091    png_ptr->num_chunk_list=old_num_chunks+num_chunks;
1092    png_ptr->chunk_list=new_list;
1093#ifdef PNG_FREE_ME_SUPPORTED
1094    png_ptr->free_me |= PNG_FREE_LIST;
1095#endif
1096}
1097#endif
1098
1099#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
1100void PNGAPI
1101png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
1102   png_user_chunk_ptr read_user_chunk_fn)
1103{
1104   png_debug(1, "in png_set_read_user_chunk_fn\n");
1105   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
1106   png_ptr->user_chunk_ptr = user_chunk_ptr;
1107}
1108#endif
1109
1110#if defined(PNG_INFO_IMAGE_SUPPORTED)
1111void PNGAPI
1112png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
1113{
1114   png_debug1(1, "in %s storage function\n", "rows");
1115
1116   if (png_ptr == NULL || info_ptr == NULL)
1117      return;
1118
1119   if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
1120      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1121   info_ptr->row_pointers = row_pointers;
1122   if(row_pointers)
1123      info_ptr->valid |= PNG_INFO_IDAT;
1124}
1125#endif
1126
1127#ifdef PNG_WRITE_SUPPORTED
1128void PNGAPI
1129png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
1130{
1131    if(png_ptr->zbuf)
1132       png_free(png_ptr, png_ptr->zbuf);
1133    png_ptr->zbuf_size = (png_size_t)size;
1134    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
1135    png_ptr->zstream.next_out = png_ptr->zbuf;
1136    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1137}
1138#endif
1139
1140void PNGAPI
1141png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
1142{
1143   if (png_ptr && info_ptr)
1144      info_ptr->valid &= ~(mask);
1145}
1146
1147
1148#ifndef PNG_1_0_X
1149#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1150/* this function was added to libpng 1.2.0 and should always exist by default */
1151void PNGAPI
1152png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
1153{
1154    png_uint_32 settable_asm_flags;
1155    png_uint_32 settable_mmx_flags;
1156
1157    settable_mmx_flags =
1158#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
1159                         PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
1160#endif
1161#ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
1162                         PNG_ASM_FLAG_MMX_READ_INTERLACE    |
1163#endif
1164#ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
1165                         PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
1166                         PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
1167                         PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
1168                         PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
1169#endif
1170                         0;
1171
1172    /* could be some non-MMX ones in the future, but not currently: */
1173    settable_asm_flags = settable_mmx_flags;
1174
1175    if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
1176        !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
1177    {
1178        /* clear all MMX flags if MMX isn't supported */
1179        settable_asm_flags &= ~settable_mmx_flags;
1180        png_ptr->asm_flags &= ~settable_mmx_flags;
1181    }
1182
1183    /* we're replacing the settable bits with those passed in by the user,
1184     * so first zero them out of the master copy, then logical-OR in the
1185     * allowed subset that was requested */
1186
1187    png_ptr->asm_flags &= ~settable_asm_flags;               /* zero them */
1188    png_ptr->asm_flags |= (asm_flags & settable_asm_flags);  /* set them */
1189}
1190#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1191
1192#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1193/* this function was added to libpng 1.2.0 */
1194void PNGAPI
1195png_set_mmx_thresholds (png_structp png_ptr,
1196                        png_byte mmx_bitdepth_threshold,
1197                        png_uint_32 mmx_rowbytes_threshold)
1198{
1199    png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
1200    png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
1201}
1202#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
1203
1204#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1205/* this function was added to libpng 1.2.6 */
1206void PNGAPI
1207png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
1208    png_uint_32 user_height_max)
1209{
1210    /* Images with dimensions larger than these limits will be
1211     * rejected by png_set_IHDR().  To accept any PNG datastream
1212     * regardless of dimensions, set both limits to 0x7ffffffL.
1213     */
1214    png_ptr->user_width_max = user_width_max;
1215    png_ptr->user_height_max = user_height_max;
1216}
1217#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1218
1219#endif /* ?PNG_1_0_X */