libs/png/pngget.c

   1
   2 /* pngget.c - retrieval of values from info struct
   3  *
   4  * Copyright (c) 2018-2023 Cosmin Truta
   5  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
   6  * Copyright (c) 1996-1997 Andreas Dilger
   7  * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
   8  *
   9  * This code is released under the libpng license.
  10  * For conditions of distribution and use, see the disclaimer
  11  * and license in png.h
  12  *
  13  */
  14
  15 #include "pngpriv.h"
  16
  17 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
  18
  19 png_uint_32 PNGAPI
  20 png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr,
  21     png_uint_32 flag)
  22 {
  23    if (png_ptr != NULL && info_ptr != NULL)
  24    {
  25 #ifdef PNG_READ_tRNS_SUPPORTED
  26       /* png_handle_PLTE() may have canceled a valid tRNS chunk but left the
  27        * 'valid' flag for the detection of duplicate chunks. Do not report a
  28        * valid tRNS chunk in this case.
  29        */
  30       if (flag == PNG_INFO_tRNS && png_ptr->num_trans == 0)
  31          return(0);
  32 #endif
  33
  34       return(info_ptr->valid & flag);
  35    }
  36
  37    return(0);
  38 }
  39
  40 size_t PNGAPI
  41 png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
  42 {
  43    if (png_ptr != NULL && info_ptr != NULL)
  44       return(info_ptr->rowbytes);
  45
  46    return(0);
  47 }
  48
  49 #ifdef PNG_INFO_IMAGE_SUPPORTED
  50 png_bytepp PNGAPI
  51 png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
  52 {
  53    if (png_ptr != NULL && info_ptr != NULL)
  54       return(info_ptr->row_pointers);
  55
  56    return(0);
  57 }
  58 #endif
  59
  60 #ifdef PNG_EASY_ACCESS_SUPPORTED
  61 /* Easy access to info, added in libpng-0.99 */
  62 png_uint_32 PNGAPI
  63 png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
  64 {
  65    if (png_ptr != NULL && info_ptr != NULL)
  66       return info_ptr->width;
  67
  68    return (0);
  69 }
  70
  71 png_uint_32 PNGAPI
  72 png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
  73 {
  74    if (png_ptr != NULL && info_ptr != NULL)
  75       return info_ptr->height;
  76
  77    return (0);
  78 }
  79
  80 png_byte PNGAPI
  81 png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
  82 {
  83    if (png_ptr != NULL && info_ptr != NULL)
  84       return info_ptr->bit_depth;
  85
  86    return (0);
  87 }
  88
  89 png_byte PNGAPI
  90 png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
  91 {
  92    if (png_ptr != NULL && info_ptr != NULL)
  93       return info_ptr->color_type;
  94
  95    return (0);
  96 }
  97
  98 png_byte PNGAPI
  99 png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
 100 {
 101    if (png_ptr != NULL && info_ptr != NULL)
 102       return info_ptr->filter_type;
 103
 104    return (0);
 105 }
 106
 107 png_byte PNGAPI
 108 png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
 109 {
 110    if (png_ptr != NULL && info_ptr != NULL)
 111       return info_ptr->interlace_type;
 112
 113    return (0);
 114 }
 115
 116 png_byte PNGAPI
 117 png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
 118 {
 119    if (png_ptr != NULL && info_ptr != NULL)
 120       return info_ptr->compression_type;
 121
 122    return (0);
 123 }
 124
 125 png_uint_32 PNGAPI
 126 png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
 127    info_ptr)
 128 {
 129 #ifdef PNG_pHYs_SUPPORTED
 130    if (png_ptr != NULL && info_ptr != NULL &&
 131        (info_ptr->valid & PNG_INFO_pHYs) != 0)
 132       {
 133          png_debug1(1, "in %s retrieval function",
 134              "png_get_x_pixels_per_meter");
 135
 136          if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
 137             return (info_ptr->x_pixels_per_unit);
 138       }
 139 #else
 140    PNG_UNUSED(png_ptr)
 141    PNG_UNUSED(info_ptr)
 142 #endif
 143
 144    return (0);
 145 }
 146
 147 png_uint_32 PNGAPI
 148 png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
 149     info_ptr)
 150 {
 151 #ifdef PNG_pHYs_SUPPORTED
 152    if (png_ptr != NULL && info_ptr != NULL &&
 153        (info_ptr->valid & PNG_INFO_pHYs) != 0)
 154    {
 155       png_debug1(1, "in %s retrieval function",
 156           "png_get_y_pixels_per_meter");
 157
 158       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
 159          return (info_ptr->y_pixels_per_unit);
 160    }
 161 #else
 162    PNG_UNUSED(png_ptr)
 163    PNG_UNUSED(info_ptr)
 164 #endif
 165
 166    return (0);
 167 }
 168
 169 png_uint_32 PNGAPI
 170 png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
 171 {
 172 #ifdef PNG_pHYs_SUPPORTED
 173    if (png_ptr != NULL && info_ptr != NULL &&
 174        (info_ptr->valid & PNG_INFO_pHYs) != 0)
 175    {
 176       png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
 177
 178       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
 179           info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
 180          return (info_ptr->x_pixels_per_unit);
 181    }
 182 #else
 183    PNG_UNUSED(png_ptr)
 184    PNG_UNUSED(info_ptr)
 185 #endif
 186
 187    return (0);
 188 }
 189
 190 #ifdef PNG_FLOATING_POINT_SUPPORTED
 191 float PNGAPI
 192 png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
 193    info_ptr)
 194 {
 195 #ifdef PNG_READ_pHYs_SUPPORTED
 196    if (png_ptr != NULL && info_ptr != NULL &&
 197        (info_ptr->valid & PNG_INFO_pHYs) != 0)
 198    {
 199       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
 200
 201       if (info_ptr->x_pixels_per_unit != 0)
 202          return ((float)((float)info_ptr->y_pixels_per_unit
 203              /(float)info_ptr->x_pixels_per_unit));
 204    }
 205 #else
 206    PNG_UNUSED(png_ptr)
 207    PNG_UNUSED(info_ptr)
 208 #endif
 209
 210    return ((float)0.0);
 211 }
 212 #endif
 213
 214 #ifdef PNG_FIXED_POINT_SUPPORTED
 215 png_fixed_point PNGAPI
 216 png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
 217     png_const_inforp info_ptr)
 218 {
 219 #ifdef PNG_READ_pHYs_SUPPORTED
 220    if (png_ptr != NULL && info_ptr != NULL &&
 221        (info_ptr->valid & PNG_INFO_pHYs) != 0 &&
 222        info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 &&
 223        info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX &&
 224        info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
 225    {
 226       png_fixed_point res;
 227
 228       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");
 229
 230       /* The following casts work because a PNG 4 byte integer only has a valid
 231        * range of 0..2^31-1; otherwise the cast might overflow.
 232        */
 233       if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
 234           (png_int_32)info_ptr->x_pixels_per_unit) != 0)
 235          return res;
 236    }
 237 #else
 238    PNG_UNUSED(png_ptr)
 239    PNG_UNUSED(info_ptr)
 240 #endif
 241
 242    return 0;
 243 }
 244 #endif
 245
 246 png_int_32 PNGAPI
 247 png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
 248 {
 249 #ifdef PNG_oFFs_SUPPORTED
 250    if (png_ptr != NULL && info_ptr != NULL &&
 251        (info_ptr->valid & PNG_INFO_oFFs) != 0)
 252    {
 253       png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
 254
 255       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
 256          return (info_ptr->x_offset);
 257    }
 258 #else
 259    PNG_UNUSED(png_ptr)
 260    PNG_UNUSED(info_ptr)
 261 #endif
 262
 263    return (0);
 264 }
 265
 266 png_int_32 PNGAPI
 267 png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
 268 {
 269 #ifdef PNG_oFFs_SUPPORTED
 270    if (png_ptr != NULL && info_ptr != NULL &&
 271        (info_ptr->valid & PNG_INFO_oFFs) != 0)
 272    {
 273       png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
 274
 275       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
 276          return (info_ptr->y_offset);
 277    }
 278 #else
 279    PNG_UNUSED(png_ptr)
 280    PNG_UNUSED(info_ptr)
 281 #endif
 282
 283    return (0);
 284 }
 285
 286 png_int_32 PNGAPI
 287 png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 288 {
 289 #ifdef PNG_oFFs_SUPPORTED
 290    if (png_ptr != NULL && info_ptr != NULL &&
 291        (info_ptr->valid & PNG_INFO_oFFs) != 0)
 292    {
 293       png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");
 294
 295       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
 296          return (info_ptr->x_offset);
 297    }
 298 #else
 299    PNG_UNUSED(png_ptr)
 300    PNG_UNUSED(info_ptr)
 301 #endif
 302
 303    return (0);
 304 }
 305
 306 png_int_32 PNGAPI
 307 png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 308 {
 309 #ifdef PNG_oFFs_SUPPORTED
 310    if (png_ptr != NULL && info_ptr != NULL &&
 311        (info_ptr->valid & PNG_INFO_oFFs) != 0)
 312    {
 313       png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");
 314
 315       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
 316          return (info_ptr->y_offset);
 317    }
 318 #else
 319    PNG_UNUSED(png_ptr)
 320    PNG_UNUSED(info_ptr)
 321 #endif
 322
 323    return (0);
 324 }
 325
 326 #ifdef PNG_INCH_CONVERSIONS_SUPPORTED
 327 static png_uint_32
 328 ppi_from_ppm(png_uint_32 ppm)
 329 {
 330 #if 0
 331    /* The conversion is *(2.54/100), in binary (32 digits):
 332     * .00000110100000001001110101001001
 333     */
 334    png_uint_32 t1001, t1101;
 335    ppm >>= 1;                  /* .1 */
 336    t1001 = ppm + (ppm >> 3);   /* .1001 */
 337    t1101 = t1001 + (ppm >> 1); /* .1101 */
 338    ppm >>= 20;                 /* .000000000000000000001 */
 339    t1101 += t1101 >> 15;       /* .1101000000000001101 */
 340    t1001 >>= 11;               /* .000000000001001 */
 341    t1001 += t1001 >> 12;       /* .000000000001001000000001001 */
 342    ppm += t1001;               /* .000000000001001000001001001 */
 343    ppm += t1101;               /* .110100000001001110101001001 */
 344    return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
 345 #else
 346    /* The argument is a PNG unsigned integer, so it is not permitted
 347     * to be bigger than 2^31.
 348     */
 349    png_fixed_point result;
 350    if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
 351        5000) != 0)
 352       return (png_uint_32)result;
 353
 354    /* Overflow. */
 355    return 0;
 356 #endif
 357 }
 358
 359 png_uint_32 PNGAPI
 360 png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 361 {
 362    return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
 363 }
 364
 365 png_uint_32 PNGAPI
 366 png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 367 {
 368    return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
 369 }
 370
 371 png_uint_32 PNGAPI
 372 png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 373 {
 374    return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
 375 }
 376
 377 #ifdef PNG_FIXED_POINT_SUPPORTED
 378 static png_fixed_point
 379 png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
 380 {
 381    /* Convert from meters * 1,000,000 to inches * 100,000, meters to
 382     * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
 383     * Notice that this can overflow - a warning is output and 0 is
 384     * returned.
 385     */
 386    return png_muldiv_warn(png_ptr, microns, 500, 127);
 387 }
 388
 389 png_fixed_point PNGAPI
 390 png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
 391     png_const_inforp info_ptr)
 392 {
 393    return png_fixed_inches_from_microns(png_ptr,
 394        png_get_x_offset_microns(png_ptr, info_ptr));
 395 }
 396 #endif
 397
 398 #ifdef PNG_FIXED_POINT_SUPPORTED
 399 png_fixed_point PNGAPI
 400 png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
 401     png_const_inforp info_ptr)
 402 {
 403    return png_fixed_inches_from_microns(png_ptr,
 404        png_get_y_offset_microns(png_ptr, info_ptr));
 405 }
 406 #endif
 407
 408 #ifdef PNG_FLOATING_POINT_SUPPORTED
 409 float PNGAPI
 410 png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
 411 {
 412    /* To avoid the overflow do the conversion directly in floating
 413     * point.
 414     */
 415    return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
 416 }
 417 #endif
 418
 419 #ifdef PNG_FLOATING_POINT_SUPPORTED
 420 float PNGAPI
 421 png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
 422 {
 423    /* To avoid the overflow do the conversion directly in floating
 424     * point.
 425     */
 426    return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
 427 }
 428 #endif
 429
 430 #ifdef PNG_pHYs_SUPPORTED
 431 png_uint_32 PNGAPI
 432 png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,
 433     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 434 {
 435    png_uint_32 retval = 0;
 436
 437    if (png_ptr != NULL && info_ptr != NULL &&
 438        (info_ptr->valid & PNG_INFO_pHYs) != 0)
 439    {
 440       png_debug1(1, "in %s retrieval function", "pHYs");
 441
 442       if (res_x != NULL)
 443       {
 444          *res_x = info_ptr->x_pixels_per_unit;
 445          retval |= PNG_INFO_pHYs;
 446       }
 447
 448       if (res_y != NULL)
 449       {
 450          *res_y = info_ptr->y_pixels_per_unit;
 451          retval |= PNG_INFO_pHYs;
 452       }
 453
 454       if (unit_type != NULL)
 455       {
 456          *unit_type = (int)info_ptr->phys_unit_type;
 457          retval |= PNG_INFO_pHYs;
 458
 459          if (*unit_type == 1)
 460          {
 461             if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
 462             if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
 463          }
 464       }
 465    }
 466
 467    return (retval);
 468 }
 469 #endif /* pHYs */
 470 #endif /* INCH_CONVERSIONS */
 471
 472 /* png_get_channels really belongs in here, too, but it's been around longer */
 473
 474 #endif /* EASY_ACCESS */
 475
 476
 477 png_byte PNGAPI
 478 png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 479 {
 480    if (png_ptr != NULL && info_ptr != NULL)
 481       return(info_ptr->channels);
 482
 483    return (0);
 484 }
 485
 486 #ifdef PNG_READ_SUPPORTED
 487 png_const_bytep PNGAPI
 488 png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
 489 {
 490    if (png_ptr != NULL && info_ptr != NULL)
 491       return(info_ptr->signature);
 492
 493    return (NULL);
 494 }
 495 #endif
 496
 497 #ifdef PNG_bKGD_SUPPORTED
 498 png_uint_32 PNGAPI
 499 png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
 500     png_color_16p *background)
 501 {
 502    if (png_ptr != NULL && info_ptr != NULL &&
 503        (info_ptr->valid & PNG_INFO_bKGD) != 0 &&
 504        background != NULL)
 505    {
 506       png_debug1(1, "in %s retrieval function", "bKGD");
 507
 508       *background = &(info_ptr->background);
 509       return (PNG_INFO_bKGD);
 510    }
 511
 512    return (0);
 513 }
 514 #endif
 515
 516 #ifdef PNG_cHRM_SUPPORTED
 517 /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
 518  * same time to correct the rgb grayscale coefficient defaults obtained from the
 519  * cHRM chunk in 1.5.4
 520  */
 521 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 522 png_uint_32 PNGAPI
 523 png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
 524     double *white_x, double *white_y, double *red_x, double *red_y,
 525     double *green_x, double *green_y, double *blue_x, double *blue_y)
 526 {
 527    /* Quiet API change: this code used to only return the end points if a cHRM
 528     * chunk was present, but the end points can also come from iCCP or sRGB
 529     * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
 530     * the png_set_ APIs merely check that set end points are mutually
 531     * consistent.
 532     */
 533    if (png_ptr != NULL && info_ptr != NULL &&
 534       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
 535    {
 536       png_debug1(1, "in %s retrieval function", "cHRM");
 537
 538       if (white_x != NULL)
 539          *white_x = png_float(png_ptr,
 540              info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
 541       if (white_y != NULL)
 542          *white_y = png_float(png_ptr,
 543              info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
 544       if (red_x != NULL)
 545          *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
 546              "cHRM red X");
 547       if (red_y != NULL)
 548          *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
 549              "cHRM red Y");
 550       if (green_x != NULL)
 551          *green_x = png_float(png_ptr,
 552              info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
 553       if (green_y != NULL)
 554          *green_y = png_float(png_ptr,
 555              info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
 556       if (blue_x != NULL)
 557          *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
 558              "cHRM blue X");
 559       if (blue_y != NULL)
 560          *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
 561              "cHRM blue Y");
 562       return (PNG_INFO_cHRM);
 563    }
 564
 565    return (0);
 566 }
 567
 568 png_uint_32 PNGAPI
 569 png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,
 570     double *red_X, double *red_Y, double *red_Z, double *green_X,
 571     double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
 572     double *blue_Z)
 573 {
 574    if (png_ptr != NULL && info_ptr != NULL &&
 575        (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
 576    {
 577       png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
 578
 579       if (red_X != NULL)
 580          *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,
 581              "cHRM red X");
 582       if (red_Y != NULL)
 583          *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,
 584              "cHRM red Y");
 585       if (red_Z != NULL)
 586          *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,
 587              "cHRM red Z");
 588       if (green_X != NULL)
 589          *green_X = png_float(png_ptr,
 590              info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");
 591       if (green_Y != NULL)
 592          *green_Y = png_float(png_ptr,
 593              info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");
 594       if (green_Z != NULL)
 595          *green_Z = png_float(png_ptr,
 596              info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");
 597       if (blue_X != NULL)
 598          *blue_X = png_float(png_ptr,
 599              info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");
 600       if (blue_Y != NULL)
 601          *blue_Y = png_float(png_ptr,
 602              info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");
 603       if (blue_Z != NULL)
 604          *blue_Z = png_float(png_ptr,
 605              info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z");
 606       return (PNG_INFO_cHRM);
 607    }
 608
 609    return (0);
 610 }
 611 #  endif
 612
 613 #  ifdef PNG_FIXED_POINT_SUPPORTED
 614 png_uint_32 PNGAPI
 615 png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 616     png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
 617     png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
 618     png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
 619     png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
 620     png_fixed_point *int_blue_Z)
 621 {
 622    if (png_ptr != NULL && info_ptr != NULL &&
 623       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
 624    {
 625       png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
 626
 627       if (int_red_X != NULL)
 628          *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;
 629       if (int_red_Y != NULL)
 630          *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;
 631       if (int_red_Z != NULL)
 632          *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;
 633       if (int_green_X != NULL)
 634          *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;
 635       if (int_green_Y != NULL)
 636          *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;
 637       if (int_green_Z != NULL)
 638          *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;
 639       if (int_blue_X != NULL)
 640          *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;
 641       if (int_blue_Y != NULL)
 642          *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;
 643       if (int_blue_Z != NULL)
 644          *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z;
 645       return (PNG_INFO_cHRM);
 646    }
 647
 648    return (0);
 649 }
 650
 651 png_uint_32 PNGAPI
 652 png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 653     png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
 654     png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
 655     png_fixed_point *blue_x, png_fixed_point *blue_y)
 656 {
 657    png_debug1(1, "in %s retrieval function", "cHRM");
 658
 659    if (png_ptr != NULL && info_ptr != NULL &&
 660       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
 661    {
 662       if (white_x != NULL)
 663          *white_x = info_ptr->colorspace.end_points_xy.whitex;
 664       if (white_y != NULL)
 665          *white_y = info_ptr->colorspace.end_points_xy.whitey;
 666       if (red_x != NULL)
 667          *red_x = info_ptr->colorspace.end_points_xy.redx;
 668       if (red_y != NULL)
 669          *red_y = info_ptr->colorspace.end_points_xy.redy;
 670       if (green_x != NULL)
 671          *green_x = info_ptr->colorspace.end_points_xy.greenx;
 672       if (green_y != NULL)
 673          *green_y = info_ptr->colorspace.end_points_xy.greeny;
 674       if (blue_x != NULL)
 675          *blue_x = info_ptr->colorspace.end_points_xy.bluex;
 676       if (blue_y != NULL)
 677          *blue_y = info_ptr->colorspace.end_points_xy.bluey;
 678       return (PNG_INFO_cHRM);
 679    }
 680
 681    return (0);
 682 }
 683 #  endif
 684 #endif
 685
 686 #ifdef PNG_gAMA_SUPPORTED
 687 #  ifdef PNG_FIXED_POINT_SUPPORTED
 688 png_uint_32 PNGAPI
 689 png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 690     png_fixed_point *file_gamma)
 691 {
 692    png_debug1(1, "in %s retrieval function", "gAMA");
 693
 694    if (png_ptr != NULL && info_ptr != NULL &&
 695        (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
 696        file_gamma != NULL)
 697    {
 698       *file_gamma = info_ptr->colorspace.gamma;
 699       return (PNG_INFO_gAMA);
 700    }
 701
 702    return (0);
 703 }
 704 #  endif
 705
 706 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 707 png_uint_32 PNGAPI
 708 png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,
 709     double *file_gamma)
 710 {
 711    png_debug1(1, "in %s retrieval function", "gAMA(float)");
 712
 713    if (png_ptr != NULL && info_ptr != NULL &&
 714       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
 715       file_gamma != NULL)
 716    {
 717       *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,
 718           "png_get_gAMA");
 719       return (PNG_INFO_gAMA);
 720    }
 721
 722    return (0);
 723 }
 724 #  endif
 725 #endif
 726
 727 #ifdef PNG_sRGB_SUPPORTED
 728 png_uint_32 PNGAPI
 729 png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,
 730     int *file_srgb_intent)
 731 {
 732    png_debug1(1, "in %s retrieval function", "sRGB");
 733
 734    if (png_ptr != NULL && info_ptr != NULL &&
 735       (info_ptr->valid & PNG_INFO_sRGB) != 0 && file_srgb_intent != NULL)
 736    {
 737       *file_srgb_intent = info_ptr->colorspace.rendering_intent;
 738       return (PNG_INFO_sRGB);
 739    }
 740
 741    return (0);
 742 }
 743 #endif
 744
 745 #ifdef PNG_iCCP_SUPPORTED
 746 png_uint_32 PNGAPI
 747 png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
 748     png_charpp name, int *compression_type,
 749     png_bytepp profile, png_uint_32 *proflen)
 750 {
 751    png_debug1(1, "in %s retrieval function", "iCCP");
 752
 753    if (png_ptr != NULL && info_ptr != NULL &&
 754        (info_ptr->valid & PNG_INFO_iCCP) != 0 &&
 755        name != NULL && profile != NULL && proflen != NULL)
 756    {
 757       *name = info_ptr->iccp_name;
 758       *profile = info_ptr->iccp_profile;
 759       *proflen = png_get_uint_32(info_ptr->iccp_profile);
 760       /* This is somewhat irrelevant since the profile data returned has
 761        * actually been uncompressed.
 762        */
 763       if (compression_type != NULL)
 764          *compression_type = PNG_COMPRESSION_TYPE_BASE;
 765       return (PNG_INFO_iCCP);
 766    }
 767
 768    return (0);
 769
 770 }
 771 #endif
 772
 773 #ifdef PNG_sPLT_SUPPORTED
 774 int PNGAPI
 775 png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,
 776     png_sPLT_tpp spalettes)
 777 {
 778    if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
 779    {
 780       *spalettes = info_ptr->splt_palettes;
 781       return info_ptr->splt_palettes_num;
 782    }
 783
 784    return (0);
 785 }
 786 #endif
 787
 788 #ifdef PNG_eXIf_SUPPORTED
 789 png_uint_32 PNGAPI
 790 png_get_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
 791     png_bytep *exif)
 792 {
 793   png_warning(png_ptr, "png_get_eXIf does not work; use png_get_eXIf_1");
 794   PNG_UNUSED(info_ptr)
 795   PNG_UNUSED(exif)
 796   return 0;
 797 }
 798
 799 png_uint_32 PNGAPI
 800 png_get_eXIf_1(png_const_structrp png_ptr, png_const_inforp info_ptr,
 801     png_uint_32 *num_exif, png_bytep *exif)
 802 {
 803    png_debug1(1, "in %s retrieval function", "eXIf");
 804
 805    if (png_ptr != NULL && info_ptr != NULL &&
 806        (info_ptr->valid & PNG_INFO_eXIf) != 0 && exif != NULL)
 807    {
 808       *num_exif = info_ptr->num_exif;
 809       *exif = info_ptr->exif;
 810       return (PNG_INFO_eXIf);
 811    }
 812
 813    return (0);
 814 }
 815 #endif
 816
 817 #ifdef PNG_hIST_SUPPORTED
 818 png_uint_32 PNGAPI
 819 png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
 820     png_uint_16p *hist)
 821 {
 822    png_debug1(1, "in %s retrieval function", "hIST");
 823
 824    if (png_ptr != NULL && info_ptr != NULL &&
 825        (info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL)
 826    {
 827       *hist = info_ptr->hist;
 828       return (PNG_INFO_hIST);
 829    }
 830
 831    return (0);
 832 }
 833 #endif
 834
 835 png_uint_32 PNGAPI
 836 png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
 837     png_uint_32 *width, png_uint_32 *height, int *bit_depth,
 838     int *color_type, int *interlace_type, int *compression_type,
 839     int *filter_type)
 840 {
 841    png_debug1(1, "in %s retrieval function", "IHDR");
 842
 843    if (png_ptr == NULL || info_ptr == NULL)
 844       return (0);
 845
 846    if (width != NULL)
 847        *width = info_ptr->width;
 848
 849    if (height != NULL)
 850        *height = info_ptr->height;
 851
 852    if (bit_depth != NULL)
 853        *bit_depth = info_ptr->bit_depth;
 854
 855    if (color_type != NULL)
 856        *color_type = info_ptr->color_type;
 857
 858    if (compression_type != NULL)
 859       *compression_type = info_ptr->compression_type;
 860
 861    if (filter_type != NULL)
 862       *filter_type = info_ptr->filter_type;
 863
 864    if (interlace_type != NULL)
 865       *interlace_type = info_ptr->interlace_type;
 866
 867    /* This is redundant if we can be sure that the info_ptr values were all
 868     * assigned in png_set_IHDR().  We do the check anyhow in case an
 869     * application has ignored our advice not to mess with the members
 870     * of info_ptr directly.
 871     */
 872    png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
 873        info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
 874        info_ptr->compression_type, info_ptr->filter_type);
 875
 876    return (1);
 877 }
 878
 879 #ifdef PNG_oFFs_SUPPORTED
 880 png_uint_32 PNGAPI
 881 png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
 882     png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 883 {
 884    png_debug1(1, "in %s retrieval function", "oFFs");
 885
 886    if (png_ptr != NULL && info_ptr != NULL &&
 887        (info_ptr->valid & PNG_INFO_oFFs) != 0 &&
 888        offset_x != NULL && offset_y != NULL && unit_type != NULL)
 889    {
 890       *offset_x = info_ptr->x_offset;
 891       *offset_y = info_ptr->y_offset;
 892       *unit_type = (int)info_ptr->offset_unit_type;
 893       return (PNG_INFO_oFFs);
 894    }
 895
 896    return (0);
 897 }
 898 #endif
 899
 900 #ifdef PNG_pCAL_SUPPORTED
 901 png_uint_32 PNGAPI
 902 png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
 903     png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
 904     png_charp *units, png_charpp *params)
 905 {
 906    png_debug1(1, "in %s retrieval function", "pCAL");
 907
 908    if (png_ptr != NULL && info_ptr != NULL &&
 909        (info_ptr->valid & PNG_INFO_pCAL) != 0 &&
 910        purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
 911        nparams != NULL && units != NULL && params != NULL)
 912    {
 913       *purpose = info_ptr->pcal_purpose;
 914       *X0 = info_ptr->pcal_X0;
 915       *X1 = info_ptr->pcal_X1;
 916       *type = (int)info_ptr->pcal_type;
 917       *nparams = (int)info_ptr->pcal_nparams;
 918       *units = info_ptr->pcal_units;
 919       *params = info_ptr->pcal_params;
 920       return (PNG_INFO_pCAL);
 921    }
 922
 923    return (0);
 924 }
 925 #endif
 926
 927 #ifdef PNG_sCAL_SUPPORTED
 928 #  ifdef PNG_FIXED_POINT_SUPPORTED
 929 #    if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
 930          defined(PNG_FLOATING_POINT_SUPPORTED)
 931 png_uint_32 PNGAPI
 932 png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 933     int *unit, png_fixed_point *width, png_fixed_point *height)
 934 {
 935    if (png_ptr != NULL && info_ptr != NULL &&
 936        (info_ptr->valid & PNG_INFO_sCAL) != 0)
 937    {
 938       *unit = info_ptr->scal_unit;
 939       /*TODO: make this work without FP support; the API is currently eliminated
 940        * if neither floating point APIs nor internal floating point arithmetic
 941        * are enabled.
 942        */
 943       *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
 944       *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
 945           "sCAL height");
 946       return (PNG_INFO_sCAL);
 947    }
 948
 949    return(0);
 950 }
 951 #    endif /* FLOATING_ARITHMETIC */
 952 #  endif /* FIXED_POINT */
 953 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 954 png_uint_32 PNGAPI
 955 png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
 956     int *unit, double *width, double *height)
 957 {
 958    if (png_ptr != NULL && info_ptr != NULL &&
 959        (info_ptr->valid & PNG_INFO_sCAL) != 0)
 960    {
 961       *unit = info_ptr->scal_unit;
 962       *width = atof(info_ptr->scal_s_width);
 963       *height = atof(info_ptr->scal_s_height);
 964       return (PNG_INFO_sCAL);
 965    }
 966
 967    return(0);
 968 }
 969 #  endif /* FLOATING POINT */
 970 png_uint_32 PNGAPI
 971 png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
 972     int *unit, png_charpp width, png_charpp height)
 973 {
 974    if (png_ptr != NULL && info_ptr != NULL &&
 975        (info_ptr->valid & PNG_INFO_sCAL) != 0)
 976    {
 977       *unit = info_ptr->scal_unit;
 978       *width = info_ptr->scal_s_width;
 979       *height = info_ptr->scal_s_height;
 980       return (PNG_INFO_sCAL);
 981    }
 982
 983    return(0);
 984 }
 985 #endif /* sCAL */
 986
 987 #ifdef PNG_pHYs_SUPPORTED
 988 png_uint_32 PNGAPI
 989 png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
 990     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 991 {
 992    png_uint_32 retval = 0;
 993
 994    png_debug1(1, "in %s retrieval function", "pHYs");
 995
 996    if (png_ptr != NULL && info_ptr != NULL &&
 997        (info_ptr->valid & PNG_INFO_pHYs) != 0)
 998    {
 999       if (res_x != NULL)
1000       {
1001          *res_x = info_ptr->x_pixels_per_unit;
1002          retval |= PNG_INFO_pHYs;
1003       }
1004
1005       if (res_y != NULL)
1006       {
1007          *res_y = info_ptr->y_pixels_per_unit;
1008          retval |= PNG_INFO_pHYs;
1009       }
1010
1011       if (unit_type != NULL)
1012       {
1013          *unit_type = (int)info_ptr->phys_unit_type;
1014          retval |= PNG_INFO_pHYs;
1015       }
1016    }
1017
1018    return (retval);
1019 }
1020 #endif /* pHYs */
1021
1022 png_uint_32 PNGAPI
1023 png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
1024     png_colorp *palette, int *num_palette)
1025 {
1026    png_debug1(1, "in %s retrieval function", "PLTE");
1027
1028    if (png_ptr != NULL && info_ptr != NULL &&
1029        (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL)
1030    {
1031       *palette = info_ptr->palette;
1032       *num_palette = info_ptr->num_palette;
1033       png_debug1(3, "num_palette = %d", *num_palette);
1034       return (PNG_INFO_PLTE);
1035    }
1036
1037    return (0);
1038 }
1039
1040 #ifdef PNG_sBIT_SUPPORTED
1041 png_uint_32 PNGAPI
1042 png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
1043     png_color_8p *sig_bit)
1044 {
1045    png_debug1(1, "in %s retrieval function", "sBIT");
1046
1047    if (png_ptr != NULL && info_ptr != NULL &&
1048        (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL)
1049    {
1050       *sig_bit = &(info_ptr->sig_bit);
1051       return (PNG_INFO_sBIT);
1052    }
1053
1054    return (0);
1055 }
1056 #endif
1057
1058 #ifdef PNG_TEXT_SUPPORTED
1059 int PNGAPI
1060 png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,
1061     png_textp *text_ptr, int *num_text)
1062 {
1063    if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
1064    {
1065       png_debug1(1, "in 0x%lx retrieval function",
1066          (unsigned long)png_ptr->chunk_name);
1067
1068       if (text_ptr != NULL)
1069          *text_ptr = info_ptr->text;
1070
1071       if (num_text != NULL)
1072          *num_text = info_ptr->num_text;
1073
1074       return info_ptr->num_text;
1075    }
1076
1077    if (num_text != NULL)
1078       *num_text = 0;
1079
1080    return(0);
1081 }
1082 #endif
1083
1084 #ifdef PNG_tIME_SUPPORTED
1085 png_uint_32 PNGAPI
1086 png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
1087     png_timep *mod_time)
1088 {
1089    png_debug1(1, "in %s retrieval function", "tIME");
1090
1091    if (png_ptr != NULL && info_ptr != NULL &&
1092        (info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL)
1093    {
1094       *mod_time = &(info_ptr->mod_time);
1095       return (PNG_INFO_tIME);
1096    }
1097
1098    return (0);
1099 }
1100 #endif
1101
1102 #ifdef PNG_tRNS_SUPPORTED
1103 png_uint_32 PNGAPI
1104 png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
1105     png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
1106 {
1107    png_uint_32 retval = 0;
1108    if (png_ptr != NULL && info_ptr != NULL &&
1109        (info_ptr->valid & PNG_INFO_tRNS) != 0)
1110    {
1111       png_debug1(1, "in %s retrieval function", "tRNS");
1112
1113       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
1114       {
1115          if (trans_alpha != NULL)
1116          {
1117             *trans_alpha = info_ptr->trans_alpha;
1118             retval |= PNG_INFO_tRNS;
1119          }
1120
1121          if (trans_color != NULL)
1122             *trans_color = &(info_ptr->trans_color);
1123       }
1124
1125       else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
1126       {
1127          if (trans_color != NULL)
1128          {
1129             *trans_color = &(info_ptr->trans_color);
1130             retval |= PNG_INFO_tRNS;
1131          }
1132
1133          if (trans_alpha != NULL)
1134             *trans_alpha = NULL;
1135       }
1136
1137       if (num_trans != NULL)
1138       {
1139          *num_trans = info_ptr->num_trans;
1140          retval |= PNG_INFO_tRNS;
1141       }
1142    }
1143
1144    return (retval);
1145 }
1146 #endif
1147
1148 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1149 int PNGAPI
1150 png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
1151     png_unknown_chunkpp unknowns)
1152 {
1153    if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
1154    {
1155       *unknowns = info_ptr->unknown_chunks;
1156       return info_ptr->unknown_chunks_num;
1157    }
1158
1159    return (0);
1160 }
1161 #endif
1162
1163 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1164 png_byte PNGAPI
1165 png_get_rgb_to_gray_status(png_const_structrp png_ptr)
1166 {
1167    return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
1168 }
1169 #endif
1170
1171 #ifdef PNG_USER_CHUNKS_SUPPORTED
1172 png_voidp PNGAPI
1173 png_get_user_chunk_ptr(png_const_structrp png_ptr)
1174 {
1175    return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
1176 }
1177 #endif
1178
1179 size_t PNGAPI
1180 png_get_compression_buffer_size(png_const_structrp png_ptr)
1181 {
1182    if (png_ptr == NULL)
1183       return 0;
1184
1185 #ifdef PNG_WRITE_SUPPORTED
1186    if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1187 #endif
1188    {
1189 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1190       return png_ptr->IDAT_read_size;
1191 #else
1192       return PNG_IDAT_READ_SIZE;
1193 #endif
1194    }
1195
1196 #ifdef PNG_WRITE_SUPPORTED
1197    else
1198       return png_ptr->zbuffer_size;
1199 #endif
1200 }
1201
1202 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1203 /* These functions were added to libpng 1.2.6 and were enabled
1204  * by default in libpng-1.4.0 */
1205 png_uint_32 PNGAPI
1206 png_get_user_width_max(png_const_structrp png_ptr)
1207 {
1208    return (png_ptr ? png_ptr->user_width_max : 0);
1209 }
1210
1211 png_uint_32 PNGAPI
1212 png_get_user_height_max(png_const_structrp png_ptr)
1213 {
1214    return (png_ptr ? png_ptr->user_height_max : 0);
1215 }
1216
1217 /* This function was added to libpng 1.4.0 */
1218 png_uint_32 PNGAPI
1219 png_get_chunk_cache_max(png_const_structrp png_ptr)
1220 {
1221    return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
1222 }
1223
1224 /* This function was added to libpng 1.4.1 */
1225 png_alloc_size_t PNGAPI
1226 png_get_chunk_malloc_max(png_const_structrp png_ptr)
1227 {
1228    return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
1229 }
1230 #endif /* SET_USER_LIMITS */
1231
1232 /* These functions were added to libpng 1.4.0 */
1233 #ifdef PNG_IO_STATE_SUPPORTED
1234 png_uint_32 PNGAPI
1235 png_get_io_state(png_const_structrp png_ptr)
1236 {
1237    return png_ptr->io_state;
1238 }
1239
1240 png_uint_32 PNGAPI
1241 png_get_io_chunk_type(png_const_structrp png_ptr)
1242 {
1243    return png_ptr->chunk_name;
1244 }
1245 #endif /* IO_STATE */
1246
1247 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1248 #  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
1249 int PNGAPI
1250 png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
1251 {
1252    if (png_ptr != NULL && info_ptr != NULL)
1253       return png_ptr->num_palette_max;
1254
1255    return (-1);
1256 }
1257 #  endif
1258 #endif
1259
1260 #endif /* READ || WRITE */