src/png/pngset.c

   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)
  20 void PNGAPI
  21 png_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
  34 void PNGAPI
  35 png_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
  84 void PNGAPI
  85 png_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
 141 void PNGAPI
 142 png_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
 166 void PNGAPI
 167 png_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)
 204 void PNGAPI
 205 png_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
 244 void PNGAPI
 245 png_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)
 353 void PNGAPI
 354 png_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)
 369 void PNGAPI
 370 png_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
 439 void PNGAPI
 440 png_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
 455 void PNGAPI
 456 png_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)
 496 void PNGAPI
 497 png_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
 511 void PNGAPI
 512 png_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)
 548 void PNGAPI
 549 png_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)
 562 void PNGAPI
 563 png_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
 573 void PNGAPI
 574 png_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)
 645 void PNGAPI
 646 png_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)
 689 void PNGAPI
 690 png_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
 699 int /* PRIVATE */
 700 png_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)
 861 void PNGAPI
 862 png_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)
 875 void PNGAPI
 876 png_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)
 917 void PNGAPI
 918 png_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)
 965 void PNGAPI
 966 png_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 }
1016 void PNGAPI
1017 png_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)
1028 void PNGAPI
1029 png_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)
1043 png_uint_32 PNGAPI
1044 png_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)
1056 void PNGAPI
1057 png_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)
1100 void PNGAPI
1101 png_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)
1111 void PNGAPI
1112 png_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
1128 void PNGAPI
1129 png_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
1140 void PNGAPI
1141 png_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 */
1151 void PNGAPI
1152 png_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 */
1194 void PNGAPI
1195 png_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 */
1206 void PNGAPI
1207 png_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 */