pngset.c 39.6 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441

/* pngset.c - storage of image information into info struct
 *
 * Last changed in libpng 1.5.26 [December 17, 2015]
 * Copyright (c) 1998-2002,2004,2006-2015 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 *
 * The functions here are used during reads to store data from the file
 * into the info struct, and during writes to store application data
 * into the info struct for writing into the file.  This abstracts the
 * info struct and allows us to change the structure in the future.
 */

#include "pngpriv.h"

#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) ||\
    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
 * and if invalid, correct the keyword rather than discarding the entire
 * chunk.  The PNG 1.0 specification requires keywords 1-79 characters in
 * length, forbids leading or trailing whitespace, multiple internal spaces,
 * and the non-break space (0x80) from ISO 8859-1.  Returns keyword length.
 *
 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
 * trailing '\0').  If this routine returns 0 then there was no keyword, or a
 * valid one could not be generated, and the caller must handle the error by not
 * setting the keyword.
 */
static png_uint_32
png_check_keyword(png_const_charp key, png_bytep new_key)
{
   png_uint_32 key_len = 0;
   int space = 1;

   if (key == NULL)
   {
      *new_key = 0;
      return 0;
   }

   while (*key && key_len < 79)
   {
      png_byte ch = (png_byte)*key++;

      if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
         *new_key++ = ch, ++key_len, space = 0;

      else if (space == 0)
      {
         /* A space or an invalid character when one wasn't seen immediately
          * before; output just a space.
          */
         *new_key++ = 32, ++key_len, space = 1;
      }
   }

   if (key_len > 0 && space != 0) /* trailing space */
      --key_len, --new_key;

   /* Terminate the keyword */
   *new_key = 0;

   if (key_len == 0)
      return 0;

   return key_len;
}
#endif /* TEXT || pCAL || iCCP || sPLT */

#ifdef PNG_bKGD_SUPPORTED
void PNGAPI
png_set_bKGD(png_structp png_ptr, png_infop info_ptr,
    png_const_color_16p background)
{
   png_debug1(1, "in %s storage function", "bKGD");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
   info_ptr->valid |= PNG_INFO_bKGD;
}
#endif

#ifdef PNG_cHRM_SUPPORTED
void PNGFAPI
png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
    png_fixed_point blue_x, png_fixed_point blue_y)
{
   png_debug1(1, "in %s storage function", "cHRM fixed");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

#  ifdef PNG_CHECK_cHRM_SUPPORTED
   if (png_check_cHRM_fixed(png_ptr,
       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
#  endif
   {
      info_ptr->x_white = white_x;
      info_ptr->y_white = white_y;
      info_ptr->x_red   = red_x;
      info_ptr->y_red   = red_y;
      info_ptr->x_green = green_x;
      info_ptr->y_green = green_y;
      info_ptr->x_blue  = blue_x;
      info_ptr->y_blue  = blue_y;
      info_ptr->valid |= PNG_INFO_cHRM;
   }
}

void PNGFAPI
png_set_cHRM_XYZ_fixed(png_structp png_ptr, png_infop info_ptr,
    png_fixed_point int_red_X, png_fixed_point int_red_Y,
    png_fixed_point int_red_Z, png_fixed_point int_green_X,
    png_fixed_point int_green_Y, png_fixed_point int_green_Z,
    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
    png_fixed_point int_blue_Z)
{
   png_XYZ XYZ;
   png_xy xy;

   png_debug1(1, "in %s storage function", "cHRM XYZ fixed");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   XYZ.redX = int_red_X;
   XYZ.redY = int_red_Y;
   XYZ.redZ = int_red_Z;
   XYZ.greenX = int_green_X;
   XYZ.greenY = int_green_Y;
   XYZ.greenZ = int_green_Z;
   XYZ.blueX = int_blue_X;
   XYZ.blueY = int_blue_Y;
   XYZ.blueZ = int_blue_Z;

   if (png_xy_from_XYZ(&xy, XYZ))
      png_error(png_ptr, "XYZ values out of representable range");

   png_set_cHRM_fixed(png_ptr, info_ptr, xy.whitex, xy.whitey, xy.redx, xy.redy,
      xy.greenx, xy.greeny, xy.bluex, xy.bluey);
}

#  ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
    double white_x, double white_y, double red_x, double red_y,
    double green_x, double green_y, double blue_x, double blue_y)
{
   png_set_cHRM_fixed(png_ptr, info_ptr,
      png_fixed(png_ptr, white_x, "cHRM White X"),
      png_fixed(png_ptr, white_y, "cHRM White Y"),
      png_fixed(png_ptr, red_x, "cHRM Red X"),
      png_fixed(png_ptr, red_y, "cHRM Red Y"),
      png_fixed(png_ptr, green_x, "cHRM Green X"),
      png_fixed(png_ptr, green_y, "cHRM Green Y"),
      png_fixed(png_ptr, blue_x, "cHRM Blue X"),
      png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
}

void PNGAPI
png_set_cHRM_XYZ(png_structp png_ptr, png_infop info_ptr, double red_X,
    double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
    double blue_X, double blue_Y, double blue_Z)
{
   png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
      png_fixed(png_ptr, red_X, "cHRM Red X"),
      png_fixed(png_ptr, red_Y, "cHRM Red Y"),
      png_fixed(png_ptr, red_Z, "cHRM Red Z"),
      png_fixed(png_ptr, green_X, "cHRM Green X"),
      png_fixed(png_ptr, green_Y, "cHRM Green Y"),
      png_fixed(png_ptr, green_Z, "cHRM Green Z"),
      png_fixed(png_ptr, blue_X, "cHRM Blue X"),
      png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
      png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
}
#  endif /* PNG_FLOATING_POINT_SUPPORTED */

#endif /* PNG_cHRM_SUPPORTED */

#ifdef PNG_gAMA_SUPPORTED
void PNGFAPI
png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
    file_gamma)
{
   png_debug1(1, "in %s storage function", "gAMA");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   /* Changed in libpng-1.5.4 to limit the values to ensure overflow can't
    * occur.  Since the fixed point representation is assymetrical it is
    * possible for 1/gamma to overflow the limit of 21474 and this means the
    * gamma value must be at least 5/100000 and hence at most 20000.0.  For
    * safety the limits here are a little narrower.  The values are 0.00016 to
    * 6250.0, which are truly ridiculous gamma values (and will produce
    * displays that are all black or all white.)
    */
   if (file_gamma < 16 || file_gamma > 625000000)
      png_warning(png_ptr, "Out of range gamma value ignored");

   else
   {
      info_ptr->gamma = file_gamma;
      info_ptr->valid |= PNG_INFO_gAMA;
   }
}

#  ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
{
   png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
       "png_set_gAMA"));
}
#  endif
#endif

#ifdef PNG_hIST_SUPPORTED
void PNGAPI
png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_const_uint_16p hist)
{
   int i;

   png_debug1(1, "in %s storage function", "hIST");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   if (info_ptr->num_palette == 0 || info_ptr->num_palette
       > PNG_MAX_PALETTE_LENGTH)
   {
      png_warning(png_ptr,
          "Invalid palette size, hIST allocation skipped");

      return;
   }

   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);

   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
    * version 1.2.1
    */
   png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
       PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16));

   if (png_ptr->hist == NULL)
   {
      png_warning(png_ptr, "Insufficient memory for hIST chunk data");
      return;
   }

   for (i = 0; i < info_ptr->num_palette; i++)
      png_ptr->hist[i] = hist[i];

   info_ptr->hist = png_ptr->hist;
   info_ptr->valid |= PNG_INFO_hIST;
   info_ptr->free_me |= PNG_FREE_HIST;
}
#endif

void PNGAPI
png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 width, png_uint_32 height, int bit_depth,
    int color_type, int interlace_type, int compression_type,
    int filter_type)
{
   png_debug1(1, "in %s storage function", "IHDR");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   info_ptr->width = width;
   info_ptr->height = height;
   info_ptr->bit_depth = (png_byte)bit_depth;
   info_ptr->color_type = (png_byte)color_type;
   info_ptr->compression_type = (png_byte)compression_type;
   info_ptr->filter_type = (png_byte)filter_type;
   info_ptr->interlace_type = (png_byte)interlace_type;

   png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
       info_ptr->compression_type, info_ptr->filter_type);

   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
      info_ptr->channels = 1;

   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
      info_ptr->channels = 3;

   else
      info_ptr->channels = 1;

   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
      info_ptr->channels++;

   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);

   info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
}

#ifdef PNG_oFFs_SUPPORTED
void PNGAPI
png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
    png_int_32 offset_x, png_int_32 offset_y, int unit_type)
{
   png_debug1(1, "in %s storage function", "oFFs");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   info_ptr->x_offset = offset_x;
   info_ptr->y_offset = offset_y;
   info_ptr->offset_unit_type = (png_byte)unit_type;
   info_ptr->valid |= PNG_INFO_oFFs;
}
#endif

#ifdef PNG_pCAL_SUPPORTED
void PNGAPI
png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
    int nparams, png_const_charp units, png_charpp params)
{
   png_byte new_purpose[80];
   png_size_t length;
   int i;

   png_debug1(1, "in %s storage function", "pCAL");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   length = png_check_keyword(purpose, new_purpose);

   if (length == 0)
   {
      png_warning(png_ptr, "pCAL: invalid purpose keyword");
      return;
   }
      
   ++length;
   png_debug1(3, "allocating purpose for info (%lu bytes)",
       (unsigned long)length);

   /* TODO: validate format of calibration name and unit name */

   /* Check that the type matches the specification. */
   if (type < 0 || type > 3)
      png_error(png_ptr, "Invalid pCAL equation type");

   /* Validate params[nparams] */
   for (i=0; i<nparams; ++i)
      if (!png_check_fp_string(params[i], png_strlen(params[i])))
         png_error(png_ptr, "Invalid format for pCAL parameter");

   info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);

   if (info_ptr->pcal_purpose == NULL)
   {
      png_warning(png_ptr, "Insufficient memory for pCAL purpose");
      return;
   }

   png_memcpy(info_ptr->pcal_purpose, new_purpose, length);

   png_debug(3, "storing X0, X1, type, and nparams in info");
   info_ptr->pcal_X0 = X0;
   info_ptr->pcal_X1 = X1;
   info_ptr->pcal_type = (png_byte)type;
   info_ptr->pcal_nparams = (png_byte)nparams;

   length = png_strlen(units) + 1;
   png_debug1(3, "allocating units for info (%lu bytes)",
     (unsigned long)length);

   info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);

   if (info_ptr->pcal_units == NULL)
   {
      png_warning(png_ptr, "Insufficient memory for pCAL units");
      return;
   }

   png_memcpy(info_ptr->pcal_units, units, length);

   info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
       (png_size_t)((nparams + 1) * png_sizeof(png_charp)));

   if (info_ptr->pcal_params == NULL)
   {
      png_warning(png_ptr, "Insufficient memory for pCAL params");
      return;
   }

   png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));

   for (i = 0; i < nparams; i++)
   {
      length = png_strlen(params[i]) + 1;
      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
          (unsigned long)length);

      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);

      if (info_ptr->pcal_params[i] == NULL)
      {
         png_warning(png_ptr, "Insufficient memory for pCAL parameter");
         return;
      }

      png_memcpy(info_ptr->pcal_params[i], params[i], length);
   }

   info_ptr->valid |= PNG_INFO_pCAL;
   info_ptr->free_me |= PNG_FREE_PCAL;
}
#endif

#ifdef PNG_sCAL_SUPPORTED
void PNGAPI
png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
    int unit, png_const_charp swidth, png_const_charp sheight)
{
   png_size_t lengthw = 0, lengthh = 0;

   png_debug1(1, "in %s storage function", "sCAL");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   /* Double check the unit (should never get here with an invalid
    * unit unless this is an API call.)
    */
   if (unit != 1 && unit != 2)
      png_error(png_ptr, "Invalid sCAL unit");

   if (swidth == NULL || (lengthw = png_strlen(swidth)) == 0 ||
       swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
      png_error(png_ptr, "Invalid sCAL width");

   if (sheight == NULL || (lengthh = png_strlen(sheight)) == 0 ||
       sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
      png_error(png_ptr, "Invalid sCAL height");

   info_ptr->scal_unit = (png_byte)unit;

   ++lengthw;

   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);

   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, lengthw);

   if (info_ptr->scal_s_width == NULL)
   {
      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
      return;
   }

   png_memcpy(info_ptr->scal_s_width, swidth, lengthw);

   ++lengthh;

   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);

   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, lengthh);

   if (info_ptr->scal_s_height == NULL)
   {
      png_free (png_ptr, info_ptr->scal_s_width);
      info_ptr->scal_s_width = NULL;

      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
      return;
   }

   png_memcpy(info_ptr->scal_s_height, sheight, lengthh);

   info_ptr->valid |= PNG_INFO_sCAL;
   info_ptr->free_me |= PNG_FREE_SCAL;
}

#  ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_sCAL(png_structp png_ptr, png_infop info_ptr, int unit, double width,
    double height)
{
   png_debug1(1, "in %s storage function", "sCAL");

   /* Check the arguments. */
   if (width <= 0)
      png_warning(png_ptr, "Invalid sCAL width ignored");

   else if (height <= 0)
      png_warning(png_ptr, "Invalid sCAL height ignored");

   else
   {
      /* Convert 'width' and 'height' to ASCII. */
      char swidth[PNG_sCAL_MAX_DIGITS+1];
      char sheight[PNG_sCAL_MAX_DIGITS+1];

      png_ascii_from_fp(png_ptr, swidth, sizeof swidth, width,
         PNG_sCAL_PRECISION);
      png_ascii_from_fp(png_ptr, sheight, sizeof sheight, height,
         PNG_sCAL_PRECISION);

      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
   }
}
#  endif

#  ifdef PNG_FIXED_POINT_SUPPORTED
void PNGAPI
png_set_sCAL_fixed(png_structp png_ptr, png_infop info_ptr, int unit,
    png_fixed_point width, png_fixed_point height)
{
   png_debug1(1, "in %s storage function", "sCAL");

   /* Check the arguments. */
   if (width <= 0)
      png_warning(png_ptr, "Invalid sCAL width ignored");

   else if (height <= 0)
      png_warning(png_ptr, "Invalid sCAL height ignored");

   else
   {
      /* Convert 'width' and 'height' to ASCII. */
      char swidth[PNG_sCAL_MAX_DIGITS+1];
      char sheight[PNG_sCAL_MAX_DIGITS+1];

      png_ascii_from_fixed(png_ptr, swidth, sizeof swidth, width);
      png_ascii_from_fixed(png_ptr, sheight, sizeof sheight, height);

      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
   }
}
#  endif
#endif

#ifdef PNG_pHYs_SUPPORTED
void PNGAPI
png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
{
   png_debug1(1, "in %s storage function", "pHYs");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   info_ptr->x_pixels_per_unit = res_x;
   info_ptr->y_pixels_per_unit = res_y;
   info_ptr->phys_unit_type = (png_byte)unit_type;
   info_ptr->valid |= PNG_INFO_pHYs;
}
#endif

void PNGAPI
png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
    png_const_colorp palette, int num_palette)
{

   png_uint_32 max_palette_length;

   png_debug1(1, "in %s storage function", "PLTE");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
      (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;

   if (num_palette < 0 || num_palette > (int) max_palette_length)
   {
      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
         png_error(png_ptr, "Invalid palette length");

      else
      {
         png_warning(png_ptr, "Invalid palette length");
         return;
      }
   }

   /* It may not actually be necessary to set png_ptr->palette here;
    * we do it for backward compatibility with the way the png_handle_tRNS
    * function used to do the allocation.
    */
   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);

   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
    * of num_palette entries, in case of an invalid PNG file or incorrect
    * call to png_set_PLTE() with too-large sample values.
    */
   png_ptr->palette = (png_colorp)png_calloc(png_ptr,
       PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));

   png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
   info_ptr->palette = png_ptr->palette;
   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;

   info_ptr->free_me |= PNG_FREE_PLTE;

   info_ptr->valid |= PNG_INFO_PLTE;
}

#ifdef PNG_sBIT_SUPPORTED
void PNGAPI
png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
    png_const_color_8p sig_bit)
{
   png_debug1(1, "in %s storage function", "sBIT");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
   info_ptr->valid |= PNG_INFO_sBIT;
}
#endif

#ifdef PNG_sRGB_SUPPORTED
void PNGAPI
png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int srgb_intent)
{
   png_debug1(1, "in %s storage function", "sRGB");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   info_ptr->srgb_intent = (png_byte)srgb_intent;
   info_ptr->valid |= PNG_INFO_sRGB;
}

void PNGAPI
png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
    int srgb_intent)
{
   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   png_set_sRGB(png_ptr, info_ptr, srgb_intent);

#  ifdef PNG_gAMA_SUPPORTED
   png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE);
#  endif

#  ifdef PNG_cHRM_SUPPORTED
   png_set_cHRM_fixed(png_ptr, info_ptr,
      /* color      x       y */
      /* white */ 31270, 32900,
      /* red   */ 64000, 33000,
      /* green */ 30000, 60000,
      /* blue  */ 15000,  6000
   );
#  endif /* cHRM */
}
#endif /* sRGB */


#ifdef PNG_iCCP_SUPPORTED
void PNGAPI
png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
    png_const_charp name, int compression_type,
    png_const_bytep profile, png_uint_32 proflen)
{
   png_byte new_name[80];
   png_charp new_iccp_name;
   png_bytep new_iccp_profile;
   png_size_t length;

   png_debug1(1, "in %s storage function", "iCCP");

   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
      return;

   length = png_check_keyword(name, new_name);

   if (length == 0)
   {
      png_warning(png_ptr, "iCCP: invalid keyword");
      return;
   }
      
   ++length;
   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);

   if (new_iccp_name == NULL)
   {
        png_warning(png_ptr, "Insufficient memory to process iCCP chunk");
      return;
   }

   png_memcpy(new_iccp_name, new_name, length);
   new_iccp_profile = (png_bytep)png_malloc_warn(png_ptr, proflen);

   if (new_iccp_profile == NULL)
   {
      png_free (png_ptr, new_iccp_name);
      png_warning(png_ptr,
          "Insufficient memory to process iCCP profile");
      return;
   }

   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);

   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);

   info_ptr->iccp_proflen = proflen;
   info_ptr->iccp_name = new_iccp_name;
   info_ptr->iccp_profile = new_iccp_profile;
   /* Compression is always zero but is here so the API and info structure
    * does not have to change if we introduce multiple compression types
    */
   info_ptr->iccp_compression = (png_byte)compression_type;
   info_ptr->free_me |= PNG_FREE_ICCP;
   info_ptr->valid |= PNG_INFO_iCCP;
}
#endif

#ifdef PNG_TEXT_SUPPORTED
void PNGAPI
png_set_text(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr,
    int num_text)
{
   int ret;
   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);

   if (ret != 0)
      png_error(png_ptr, "Insufficient memory to store text");
}

int /* PRIVATE */
png_set_text_2(png_structp png_ptr, png_infop info_ptr,
    png_const_textp text_ptr, int num_text)
{
   int i;
   size_t element_size;

  png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11 :
      (unsigned long)png_ptr->chunk_name);

   if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
      return(0);

   /* Make sure we have enough space in the "text" array in info_struct
    * to hold all of the incoming text_ptr objects.
    */

   element_size=png_sizeof(png_text);
   if (num_text < 0 ||
       num_text > INT_MAX - info_ptr->num_text - 8 ||
       (unsigned int)/*SAFE*/(num_text +/*SAFE*/
       info_ptr->num_text + 8) >=
       PNG_SIZE_MAX/element_size)
   {
      png_warning(png_ptr, "too many text chunks");
      return(0);
   }

   if (info_ptr->num_text + num_text > info_ptr->max_text)
   {
      int old_max_text = info_ptr->max_text;
      int old_num_text = info_ptr->num_text;

      if (info_ptr->text != NULL)
      {
         png_textp old_text;

         info_ptr->max_text = info_ptr->num_text + num_text + 8;
         old_text = info_ptr->text;

         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
            (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));

         if (info_ptr->text == NULL)
         {
            /* Restore to previous condition */
            info_ptr->max_text = old_max_text;
            info_ptr->text = old_text;
            return(1);
         }

         png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max_text *
             png_sizeof(png_text)));
         png_free(png_ptr, old_text);
      }

      else
      {
         info_ptr->max_text = num_text + 8;
         info_ptr->num_text = 0;
         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
             (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
         if (info_ptr->text == NULL)
         {
            /* Restore to previous condition */
            info_ptr->num_text = old_num_text;
            info_ptr->max_text = old_max_text;
            return(1);
         }
         info_ptr->free_me |= PNG_FREE_TEXT;
      }

      png_debug1(3, "allocated %d entries for info_ptr->text",
          info_ptr->max_text);
   }
   for (i = 0; i < num_text; i++)
   {
      png_byte new_key[80], new_lang[80];
      png_size_t text_length, key_len;
      png_size_t lang_len, lang_key_len;
      png_textp textp = &(info_ptr->text[info_ptr->num_text]);

      if (text_ptr[i].key == NULL)
          continue;

      if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
          text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
      {
         png_warning(png_ptr, "text compression mode is out of range");
         continue;
      }

      key_len = png_check_keyword(text_ptr[i].key, new_key);

      if (key_len == 0)
      {
         png_warning(png_ptr, "invalid text keyword");
         continue;
      }

      if (text_ptr[i].compression <= 0)
      {
         lang_len = 0;
         lang_key_len = 0;
      }

      else
#  ifdef PNG_iTXt_SUPPORTED
      {
         /* Set iTXt data */

        /* Zero length language is OK */
         if (text_ptr[i].lang != NULL)
            lang_len = png_check_keyword(text_ptr[i].lang, new_lang);

         else
            lang_len = 0;

         if (text_ptr[i].lang_key != NULL)
            lang_key_len = png_strlen(text_ptr[i].lang_key);

         else
            lang_key_len = 0;
      }
#  else /* PNG_iTXt_SUPPORTED */
      {
         png_warning(png_ptr, "iTXt chunk not supported");
         continue;
      }
#  endif

      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
      {
         text_length = 0;
#  ifdef PNG_iTXt_SUPPORTED
         if (text_ptr[i].compression > 0)
            textp->compression = PNG_ITXT_COMPRESSION_NONE;

         else
#  endif
            textp->compression = PNG_TEXT_COMPRESSION_NONE;
      }

      else
      {
         text_length = png_strlen(text_ptr[i].text);
         textp->compression = text_ptr[i].compression;
      }

      textp->key = (png_charp)png_malloc_warn(png_ptr,
          (png_size_t)
          (key_len + text_length + lang_len + lang_key_len + 4));

      if (textp->key == NULL)
         return(1);

      png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
          (unsigned long)(png_uint_32)
          (key_len + lang_len + lang_key_len + text_length + 4),
          textp->key);

      png_memcpy(textp->key, new_key, (png_size_t)(key_len));
      *(textp->key + key_len) = '\0';

      if (text_ptr[i].compression > 0)
      {
         textp->lang = textp->key + key_len + 1;
         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
         *(textp->lang + lang_len) = '\0';
         textp->lang_key = textp->lang + lang_len + 1;
         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
         *(textp->lang_key + lang_key_len) = '\0';
         textp->text = textp->lang_key + lang_key_len + 1;
      }

      else
      {
         textp->lang=NULL;
         textp->lang_key=NULL;
         textp->text = textp->key + key_len + 1;
      }

      if (text_length != 0)
         png_memcpy(textp->text, text_ptr[i].text,
             (png_size_t)(text_length));

      *(textp->text + text_length) = '\0';

#  ifdef PNG_iTXt_SUPPORTED
      if (textp->compression > 0)
      {
         textp->text_length = 0;
         textp->itxt_length = text_length;
      }

      else
#  endif
      {
         textp->text_length = text_length;
         textp->itxt_length = 0;
      }

      info_ptr->num_text++;
      png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
   }
   return(0);
}
#endif

#ifdef PNG_tIME_SUPPORTED
void PNGAPI
png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)
{
   png_debug1(1, "in %s storage function", "tIME");

   if (png_ptr == NULL || info_ptr == NULL ||
       (png_ptr->mode & PNG_WROTE_tIME))
      return;

   if (mod_time->month == 0   || mod_time->month > 12  ||
       mod_time->day   == 0   || mod_time->day   > 31  ||
       mod_time->hour  > 23   || mod_time->minute > 59 ||
       mod_time->second > 60)
   {
      png_warning(png_ptr, "Ignoring invalid time value");
      return;
   }

   png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
   info_ptr->valid |= PNG_INFO_tIME;
}
#endif

#ifdef PNG_tRNS_SUPPORTED
void PNGAPI
png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
{
   png_debug1(1, "in %s storage function", "tRNS");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   if (num_trans < 0 || num_trans > PNG_MAX_PALETTE_LENGTH)
      {
        png_warning(png_ptr, "Ignoring invalid num_trans value");
        return;
      }

   if (trans_alpha != NULL)
   {
       /* It may not actually be necessary to set png_ptr->trans_alpha here;
        * we do it for backward compatibility with the way the png_handle_tRNS
        * function used to do the allocation.
        */

       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);

       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
       png_ptr->trans_alpha = info_ptr->trans_alpha =
           (png_bytep)png_malloc(png_ptr, (png_size_t)PNG_MAX_PALETTE_LENGTH);

       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
          png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
   }

   if (trans_color != NULL)
   {
      if (info_ptr->bit_depth < 16)
      {
         unsigned int sample_max = (1U << info_ptr->bit_depth) - 1U;

         if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
             trans_color->gray > sample_max) ||
             (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
             (trans_color->red > sample_max ||
             trans_color->green > sample_max ||
             trans_color->blue > sample_max)))
           png_warning(png_ptr,
              "tRNS chunk has out-of-range samples for bit_depth");
      }

      png_memcpy(&(info_ptr->trans_color), trans_color,
         png_sizeof(png_color_16));

      if (num_trans == 0)
         num_trans = 1;
   }

   info_ptr->num_trans = (png_uint_16)num_trans;

   if (num_trans != 0)
   {
      info_ptr->valid |= PNG_INFO_tRNS;
      info_ptr->free_me |= PNG_FREE_TRNS;
   }
}
#endif

#ifdef PNG_sPLT_SUPPORTED
void PNGAPI
png_set_sPLT(png_structp png_ptr,
    png_infop info_ptr, png_const_sPLT_tp entries, int nentries)
/*
 *  entries        - array of png_sPLT_t structures
 *                   to be added to the list of palettes
 *                   in the info structure.
 *
 *  nentries       - number of palette structures to be
 *                   added.
 */
{
   png_sPLT_tp np;
   int i, j;
   size_t element_size;

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   element_size = png_sizeof(png_sPLT_t);
   if (nentries < 0 ||
       nentries > INT_MAX-info_ptr->splt_palettes_num ||
       (unsigned int)/*SAFE*/(nentries +/*SAFE*/
       info_ptr->splt_palettes_num) >=
       PNG_SIZE_MAX/element_size)
      np=NULL;

   else

      np = (png_sPLT_tp)png_malloc_warn(png_ptr,
          (info_ptr->splt_palettes_num + nentries) *
          (png_size_t)png_sizeof(png_sPLT_t));

   if (np == NULL)
   {
      png_warning(png_ptr, "No memory for sPLT palettes");
      return;
   }

   png_memcpy(np, info_ptr->splt_palettes,
       info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));

   png_free(png_ptr, info_ptr->splt_palettes);
   info_ptr->splt_palettes=NULL;

   for (i = j = 0; i < nentries; i++)
   {
      png_sPLT_tp to = np + info_ptr->splt_palettes_num + j;
      png_const_sPLT_tp from = entries + i;
      png_byte new_name[80];
      png_size_t length;

      length = png_check_keyword(from->name, new_name);

      if (length == 0)
      {
         png_warning(png_ptr, "sPLT: invalid keyword");
         continue;
      }

      ++length; /* for trailing '\0' */
      to->name = (png_charp)png_malloc_warn(png_ptr, length);

      if (to->name == NULL)
      {
         png_warning(png_ptr,
             "Out of memory while processing sPLT chunk");
         continue;
      }

      png_memcpy(to->name, new_name, length);
      to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
          from->nentries * png_sizeof(png_sPLT_entry));

      if (to->entries == NULL)
      {
         png_warning(png_ptr,
             "Out of memory while processing sPLT chunk");
         png_free(png_ptr, to->name);
         to->name = NULL;
         continue;
      }

      png_memcpy(to->entries, from->entries,
          from->nentries * png_sizeof(png_sPLT_entry));

      to->nentries = from->nentries;
      to->depth = from->depth;
      ++j;
   }

   info_ptr->splt_palettes = np;
   info_ptr->splt_palettes_num = j;
   info_ptr->valid |= PNG_INFO_sPLT;
   info_ptr->free_me |= PNG_FREE_SPLT;
}
#endif /* PNG_sPLT_SUPPORTED */

#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
void PNGAPI
png_set_unknown_chunks(png_structp png_ptr,
   png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
{
   png_unknown_chunkp np;
   int i;
   size_t element_size;

   if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
      return;

   element_size = png_sizeof(png_unknown_chunk);
   if (num_unknowns < 0 ||
       num_unknowns > INT_MAX-info_ptr->unknown_chunks_num ||
       (unsigned int)/*SAFE*/(num_unknowns +/*SAFE*/
       info_ptr->unknown_chunks_num) >=
       PNG_SIZE_MAX/element_size)
      np=NULL;

   else
      np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
          (png_size_t)(info_ptr->unknown_chunks_num + num_unknowns) *
          png_sizeof(png_unknown_chunk));

   if (np == NULL)
   {
      png_warning(png_ptr,
          "Out of memory while processing unknown chunk");
      return;
   }

   png_memcpy(np, info_ptr->unknown_chunks,
       (png_size_t)info_ptr->unknown_chunks_num *
       png_sizeof(png_unknown_chunk));

   png_free(png_ptr, info_ptr->unknown_chunks);
   info_ptr->unknown_chunks = NULL;

   for (i = 0; i < num_unknowns; i++)
   {
      png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
      png_const_unknown_chunkp from = unknowns + i;

      png_memcpy(to->name, from->name, png_sizeof(from->name));
      to->name[png_sizeof(to->name)-1] = '\0';
      to->size = from->size;

      /* Note our location in the read or write sequence */
      to->location = (png_byte)(png_ptr->mode & 0xff);

      if (from->size == 0)
         to->data=NULL;

      else
      {
         to->data = (png_bytep)png_malloc_warn(png_ptr,
             (png_size_t)from->size);

         if (to->data == NULL)
         {
            png_warning(png_ptr,
                "Out of memory while processing unknown chunk");
            to->size = 0;
         }

         else
            png_memcpy(to->data, from->data, from->size);
      }
   }

   info_ptr->unknown_chunks = np;
   info_ptr->unknown_chunks_num += num_unknowns;
   info_ptr->free_me |= PNG_FREE_UNKN;
}

void PNGAPI
png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
    int chunk, int location)
{
   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
       info_ptr->unknown_chunks_num)
      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
}
#endif


#ifdef PNG_MNG_FEATURES_SUPPORTED
png_uint_32 PNGAPI
png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
{
   png_debug(1, "in png_permit_mng_features");

   if (png_ptr == NULL)
      return (png_uint_32)0;

   png_ptr->mng_features_permitted =
       (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);

   return (png_uint_32)png_ptr->mng_features_permitted;
}
#endif

#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
void PNGAPI
png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_const_bytep
    chunk_list, int num_chunks)
{
   png_bytep new_list, p;
   int i, old_num_chunks;
   if (png_ptr == NULL)
      return;

   if (num_chunks == 0)
   {
      if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
         png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;

      else
         png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;

      if (keep == PNG_HANDLE_CHUNK_ALWAYS)
         png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;

      else
         png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;

      return;
   }

   if (chunk_list == NULL)
      return;

   old_num_chunks = png_ptr->num_chunk_list;
   new_list=(png_bytep)png_malloc(png_ptr,
       (png_size_t)(5*(num_chunks + old_num_chunks)));

   if (png_ptr->chunk_list != NULL)
   {
      png_memcpy(new_list, png_ptr->chunk_list,
          (png_size_t)(5*old_num_chunks));
      png_free(png_ptr, png_ptr->chunk_list);
      png_ptr->chunk_list=NULL;
   }

   png_memcpy(new_list + 5*old_num_chunks, chunk_list,
       (png_size_t)(5*num_chunks));

   for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
      *p=(png_byte)keep;

   png_ptr->num_chunk_list = old_num_chunks + num_chunks;
   png_ptr->chunk_list = new_list;
   png_ptr->free_me |= PNG_FREE_LIST;
}
#endif

#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
void PNGAPI
png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
    png_user_chunk_ptr read_user_chunk_fn)
{
   png_debug(1, "in png_set_read_user_chunk_fn");

   if (png_ptr == NULL)
      return;

   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
   png_ptr->user_chunk_ptr = user_chunk_ptr;
}
#endif

#ifdef PNG_INFO_IMAGE_SUPPORTED
void PNGAPI
png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
{
   png_debug1(1, "in %s storage function", "rows");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);

   info_ptr->row_pointers = row_pointers;

   if (row_pointers != NULL)
      info_ptr->valid |= PNG_INFO_IDAT;
}
#endif

#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
void PNGAPI
png_set_compression_buffer_size(png_structp png_ptr, png_size_t size)
{
    if (png_ptr == NULL)
       return;

    png_free(png_ptr, png_ptr->zbuf);

    if (size > ZLIB_IO_MAX)
    {
       png_warning(png_ptr, "Attempt to set buffer size beyond max ignored");
       png_ptr->zbuf_size = ZLIB_IO_MAX;
       size = ZLIB_IO_MAX; /* must fit */
    }

    else
       png_ptr->zbuf_size = (uInt)size;

    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);

    /* The following ensures a relatively safe failure if this gets called while
     * the buffer is actually in use.
     */
    png_ptr->zstream.next_out = png_ptr->zbuf;
    png_ptr->zstream.avail_out = 0;
    png_ptr->zstream.avail_in = 0;
}
#endif /* WRITE_CUSTOMIZE_COMPRESSION */

void PNGAPI
png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
{
   if (png_ptr && info_ptr)
      info_ptr->valid &= ~mask;
}



#ifdef PNG_SET_USER_LIMITS_SUPPORTED
/* This function was added to libpng 1.2.6 */
void PNGAPI
png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
    png_uint_32 user_height_max)
{
   /* Images with dimensions larger than these limits will be
    * rejected by png_set_IHDR().  To accept any PNG datastream
    * regardless of dimensions, set both limits to 0x7fffffffL.
    */
   if (png_ptr == NULL)
      return;

   png_ptr->user_width_max = user_width_max;
   png_ptr->user_height_max = user_height_max;
}

/* This function was added to libpng 1.4.0 */
void PNGAPI
png_set_chunk_cache_max (png_structp png_ptr,
   png_uint_32 user_chunk_cache_max)
{
    if (png_ptr != NULL)
       png_ptr->user_chunk_cache_max = user_chunk_cache_max;
}

/* This function was added to libpng 1.4.1 */
void PNGAPI
png_set_chunk_malloc_max (png_structp png_ptr,
    png_alloc_size_t user_chunk_malloc_max)
{
   if (png_ptr != NULL)
      png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
}
#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */


#ifdef PNG_BENIGN_ERRORS_SUPPORTED
void PNGAPI
png_set_benign_errors(png_structp png_ptr, int allowed)
{
   png_debug(1, "in png_set_benign_errors");

   if (allowed != 0)
      png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;

   else
      png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN;
}
#endif /* PNG_BENIGN_ERRORS_SUPPORTED */

#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
/* Whether to report invalid palette index; added at libng-1.5.10
 *   allowed  - one of 0: disable; 1: enable
 */
void PNGAPI
png_set_check_for_invalid_index(png_structp png_ptr, int allowed)
{
   png_debug(1, "in png_set_check_for_invalid_index");

   if (allowed != 0)
      png_ptr->num_palette_max = 0;

   else
      png_ptr->num_palette_max = -1;
}
#endif
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */