1 

     2 /* pngset.c - storage of image information into info struct

     3  *

     4  * Last changed in libpng 1.2.30 [August 15, 2008]

     5  * For conditions of distribution and use, see copyright notice in png.h

     6  * Copyright (c) 1998-2008 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 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

    19 

    20 #if defined(PNG_bKGD_SUPPORTED)

    21 void PNGAPI

    22 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)

    23 {

    24    png_debug1(1, "in %s storage function\n", "bKGD");

    25    if (png_ptr == NULL || info_ptr == NULL)

    26       return;

    27 

    28    png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));

    29    info_ptr->valid |= PNG_INFO_bKGD;

    30 }

    31 #endif

    32 

    33 #if defined(PNG_cHRM_SUPPORTED)

    34 #ifdef PNG_FLOATING_POINT_SUPPORTED

    35 void PNGAPI

    36 png_set_cHRM(png_structp png_ptr, png_infop info_ptr,

    37    double white_x, double white_y, double red_x, double red_y,

    38    double green_x, double green_y, double blue_x, double blue_y)

    39 {

    40    png_debug1(1, "in %s storage function\n", "cHRM");

    41    if (png_ptr == NULL || info_ptr == NULL)

    42       return;

    43    if (!(white_x || white_y || red_x || red_y || green_x || green_y ||

    44        blue_x || blue_y))

    45    {

    46       png_warning(png_ptr,

    47         "Ignoring attempt to set all-zero chromaticity values");

    48       return;

    49    }

    50    if (white_x < 0.0 || white_y < 0.0 ||

    51          red_x < 0.0 ||   red_y < 0.0 ||

    52        green_x < 0.0 || green_y < 0.0 ||

    53         blue_x < 0.0 ||  blue_y < 0.0)

    54    {

    55       png_warning(png_ptr,

    56         "Ignoring attempt to set negative chromaticity value");

    57       return;

    58    }

    59    if (white_x > 21474.83 || white_y > 21474.83 ||

    60          red_x > 21474.83 ||   red_y > 21474.83 ||

    61        green_x > 21474.83 || green_y > 21474.83 ||

    62         blue_x > 21474.83 ||  blue_y > 21474.83)

    63    {

    64       png_warning(png_ptr,

    65         "Ignoring attempt to set chromaticity value exceeding 21474.83");

    66       return;

    67    }

    68 

    69    info_ptr->x_white = (float)white_x;

    70    info_ptr->y_white = (float)white_y;

    71    info_ptr->x_red   = (float)red_x;

    72    info_ptr->y_red   = (float)red_y;

    73    info_ptr->x_green = (float)green_x;

    74    info_ptr->y_green = (float)green_y;

    75    info_ptr->x_blue  = (float)blue_x;

    76    info_ptr->y_blue  = (float)blue_y;

    77 #ifdef PNG_FIXED_POINT_SUPPORTED

    78    info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);

    79    info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);

    80    info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000.+0.5);

    81    info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000.+0.5);

    82    info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);

    83    info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);

    84    info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000.+0.5);

    85    info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000.+0.5);

    86 #endif

    87    info_ptr->valid |= PNG_INFO_cHRM;

    88 }

    89 #endif

    90 #ifdef PNG_FIXED_POINT_SUPPORTED

    91 void PNGAPI

    92 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,

    93    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,

    94    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,

    95    png_fixed_point blue_x, png_fixed_point blue_y)

    96 {

    97    png_debug1(1, "in %s storage function\n", "cHRM");

    98    if (png_ptr == NULL || info_ptr == NULL)

    99       return;

   100 

   101    if (!(white_x || white_y || red_x || red_y || green_x || green_y ||

   102        blue_x || blue_y))

   103    {

   104       png_warning(png_ptr,

   105         "Ignoring attempt to set all-zero chromaticity values");

   106       return;

   107    }

   108    if (white_x < 0 || white_y < 0 ||

   109          red_x < 0 ||   red_y < 0 ||

   110        green_x < 0 || green_y < 0 ||

   111         blue_x < 0 ||  blue_y < 0)

   112    {

   113       png_warning(png_ptr,

   114         "Ignoring attempt to set negative chromaticity value");

   115       return;

   116    }

   117    if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||

   118        white_y > (png_fixed_point) PNG_UINT_31_MAX ||

   119          red_x > (png_fixed_point) PNG_UINT_31_MAX ||

   120          red_y > (png_fixed_point) PNG_UINT_31_MAX ||

   121        green_x > (png_fixed_point) PNG_UINT_31_MAX ||

   122        green_y > (png_fixed_point) PNG_UINT_31_MAX ||

   123         blue_x > (png_fixed_point) PNG_UINT_31_MAX ||

   124         blue_y > (png_fixed_point) PNG_UINT_31_MAX )

   125    {

   126       png_warning(png_ptr,

   127         "Ignoring attempt to set chromaticity value exceeding 21474.83");

   128       return;

   129    }

   130    info_ptr->int_x_white = white_x;

   131    info_ptr->int_y_white = white_y;

   132    info_ptr->int_x_red   = red_x;

   133    info_ptr->int_y_red   = red_y;

   134    info_ptr->int_x_green = green_x;

   135    info_ptr->int_y_green = green_y;

   136    info_ptr->int_x_blue  = blue_x;

   137    info_ptr->int_y_blue  = blue_y;

   138 #ifdef PNG_FLOATING_POINT_SUPPORTED

   139    info_ptr->x_white = (float)(white_x/100000.);

   140    info_ptr->y_white = (float)(white_y/100000.);

   141    info_ptr->x_red   = (float)(  red_x/100000.);

   142    info_ptr->y_red   = (float)(  red_y/100000.);

   143    info_ptr->x_green = (float)(green_x/100000.);

   144    info_ptr->y_green = (float)(green_y/100000.);

   145    info_ptr->x_blue  = (float)( blue_x/100000.);

   146    info_ptr->y_blue  = (float)( blue_y/100000.);

   147 #endif

   148    info_ptr->valid |= PNG_INFO_cHRM;

   149 }

   150 #endif

   151 #endif

   152 

   153 #if defined(PNG_gAMA_SUPPORTED)

   154 #ifdef PNG_FLOATING_POINT_SUPPORTED

   155 void PNGAPI

   156 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)

   157 {

   158    double gamma;

   159    png_debug1(1, "in %s storage function\n", "gAMA");

   160    if (png_ptr == NULL || info_ptr == NULL)

   161       return;

   162 

   163    /* Check for overflow */

   164    if (file_gamma > 21474.83)

   165    {

   166       png_warning(png_ptr, "Limiting gamma to 21474.83");

   167       gamma=21474.83;

   168    }

   169    else

   170       gamma = file_gamma;

   171    info_ptr->gamma = (float)gamma;

   172 #ifdef PNG_FIXED_POINT_SUPPORTED

   173    info_ptr->int_gamma = (int)(gamma*100000.+.5);

   174 #endif

   175    info_ptr->valid |= PNG_INFO_gAMA;

   176    if (gamma == 0.0)

   177       png_warning(png_ptr, "Setting gamma=0");

   178 }

   179 #endif

   180 void PNGAPI

   181 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point

   182    int_gamma)

   183 {

   184    png_fixed_point gamma;

   185 

   186    png_debug1(1, "in %s storage function\n", "gAMA");

   187    if (png_ptr == NULL || info_ptr == NULL)

   188       return;

   189 

   190    if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)

   191    {

   192      png_warning(png_ptr, "Limiting gamma to 21474.83");

   193      gamma=PNG_UINT_31_MAX;

   194    }

   195    else

   196    {

   197      if (int_gamma < 0)

   198      {

   199        png_warning(png_ptr, "Setting negative gamma to zero");

   200        gamma = 0;

   201      }

   202      else

   203        gamma = int_gamma;

   204    }

   205 #ifdef PNG_FLOATING_POINT_SUPPORTED

   206    info_ptr->gamma = (float)(gamma/100000.);

   207 #endif

   208 #ifdef PNG_FIXED_POINT_SUPPORTED

   209    info_ptr->int_gamma = gamma;

   210 #endif

   211    info_ptr->valid |= PNG_INFO_gAMA;

   212    if (gamma == 0)

   213       png_warning(png_ptr, "Setting gamma=0");

   214 }

   215 #endif

   216 

   217 #if defined(PNG_hIST_SUPPORTED)

   218 void PNGAPI

   219 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)

   220 {

   221    int i;

   222 

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

   224    if (png_ptr == NULL || info_ptr == NULL)

   225       return;

   226    if (info_ptr->num_palette == 0 || info_ptr->num_palette

   227        > PNG_MAX_PALETTE_LENGTH)

   228    {

   229        png_warning(png_ptr,

   230           "Invalid palette size, hIST allocation skipped.");

   231        return;

   232    }

   233 

   234 #ifdef PNG_FREE_ME_SUPPORTED

   235    png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);

   236 #endif

   237    /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version

   238       1.2.1 */

   239    png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,

   240       (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));

   241    if (png_ptr->hist == NULL)

   242      {

   243        png_warning(png_ptr, "Insufficient memory for hIST chunk data.");

   244        return;

   245      }

   246 

   247    for (i = 0; i < info_ptr->num_palette; i++)

   248        png_ptr->hist[i] = hist[i];

   249    info_ptr->hist = png_ptr->hist;

   250    info_ptr->valid |= PNG_INFO_hIST;

   251 

   252 #ifdef PNG_FREE_ME_SUPPORTED

   253    info_ptr->free_me |= PNG_FREE_HIST;

   254 #else

   255    png_ptr->flags |= PNG_FLAG_FREE_HIST;

   256 #endif

   257 }

   258 #endif

   259 

   260 void PNGAPI

   261 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,

   262    png_uint_32 width, png_uint_32 height, int bit_depth,

   263    int color_type, int interlace_type, int compression_type,

   264    int filter_type)

   265 {

   266    png_debug1(1, "in %s storage function\n", "IHDR");

   267    if (png_ptr == NULL || info_ptr == NULL)

   268       return;

   269 

   270    /* check for width and height valid values */

   271    if (width == 0 || height == 0)

   272       png_error(png_ptr, "Image width or height is zero in IHDR");

   273 #ifdef PNG_SET_USER_LIMITS_SUPPORTED

   274    if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)

   275       png_error(png_ptr, "image size exceeds user limits in IHDR");

   276 #else

   277    if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)

   278       png_error(png_ptr, "image size exceeds user limits in IHDR");

   279 #endif

   280    if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)

   281       png_error(png_ptr, "Invalid image size in IHDR");

   282    if ( width > (PNG_UINT_32_MAX

   283                  >> 3)      /* 8-byte RGBA pixels */

   284                  - 64       /* bigrowbuf hack */

   285                  - 1        /* filter byte */

   286                  - 7*8      /* rounding of width to multiple of 8 pixels */

   287                  - 8)       /* extra max_pixel_depth pad */

   288       png_warning(png_ptr, "Width is too large for libpng to process pixels");

   289 

   290    /* check other values */

   291    if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&

   292       bit_depth != 8 && bit_depth != 16)

   293       png_error(png_ptr, "Invalid bit depth in IHDR");

   294 

   295    if (color_type < 0 || color_type == 1 ||

   296       color_type == 5 || color_type > 6)

   297       png_error(png_ptr, "Invalid color type in IHDR");

   298 

   299    if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||

   300        ((color_type == PNG_COLOR_TYPE_RGB ||

   301          color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||

   302          color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))

   303       png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");

   304 

   305    if (interlace_type >= PNG_INTERLACE_LAST)

   306       png_error(png_ptr, "Unknown interlace method in IHDR");

   307 

   308    if (compression_type != PNG_COMPRESSION_TYPE_BASE)

   309       png_error(png_ptr, "Unknown compression method in IHDR");

   310 

   311 #if defined(PNG_MNG_FEATURES_SUPPORTED)

   312    /* Accept filter_method 64 (intrapixel differencing) only if

   313     * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and

   314     * 2. Libpng did not read a PNG signature (this filter_method is only

   315     *    used in PNG datastreams that are embedded in MNG datastreams) and

   316     * 3. The application called png_permit_mng_features with a mask that

   317     *    included PNG_FLAG_MNG_FILTER_64 and

   318     * 4. The filter_method is 64 and

   319     * 5. The color_type is RGB or RGBA

   320     */

   321    if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)

   322       png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");

   323    if (filter_type != PNG_FILTER_TYPE_BASE)

   324    {

   325      if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&

   326         (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&

   327         ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&

   328         (color_type == PNG_COLOR_TYPE_RGB ||

   329          color_type == PNG_COLOR_TYPE_RGB_ALPHA)))

   330         png_error(png_ptr, "Unknown filter method in IHDR");

   331      if (png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)

   332         png_warning(png_ptr, "Invalid filter method in IHDR");

   333    }

   334 #else

   335    if (filter_type != PNG_FILTER_TYPE_BASE)

   336       png_error(png_ptr, "Unknown filter method in IHDR");

   337 #endif

   338 

   339    info_ptr->width = width;

   340    info_ptr->height = height;

   341    info_ptr->bit_depth = (png_byte)bit_depth;

   342    info_ptr->color_type =(png_byte) color_type;

   343    info_ptr->compression_type = (png_byte)compression_type;

   344    info_ptr->filter_type = (png_byte)filter_type;

   345    info_ptr->interlace_type = (png_byte)interlace_type;

   346    if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)

   347       info_ptr->channels = 1;

   348    else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)

   349       info_ptr->channels = 3;

   350    else

   351       info_ptr->channels = 1;

   352    if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)

   353       info_ptr->channels++;

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

   355 

   356    /* check for potential overflow */

   357    if (width > (PNG_UINT_32_MAX

   358                  >> 3)      /* 8-byte RGBA pixels */

   359                  - 64       /* bigrowbuf hack */

   360                  - 1        /* filter byte */

   361                  - 7*8      /* rounding of width to multiple of 8 pixels */

   362                  - 8)       /* extra max_pixel_depth pad */

   363       info_ptr->rowbytes = (png_size_t)0;

   364    else

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

   366 }

   367 

   368 #if defined(PNG_oFFs_SUPPORTED)

   369 void PNGAPI

   370 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,

   371    png_int_32 offset_x, png_int_32 offset_y, int unit_type)

   372 {

   373    png_debug1(1, "in %s storage function\n", "oFFs");

   374    if (png_ptr == NULL || info_ptr == NULL)

   375       return;

   376 

   377    info_ptr->x_offset = offset_x;

   378    info_ptr->y_offset = offset_y;

   379    info_ptr->offset_unit_type = (png_byte)unit_type;

   380    info_ptr->valid |= PNG_INFO_oFFs;

   381 }

   382 #endif

   383 

   384 #if defined(PNG_pCAL_SUPPORTED)

   385 void PNGAPI

   386 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,

   387    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,

   388    png_charp units, png_charpp params)

   389 {

   390    png_uint_32 length;

   391    int i;

   392 

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

   394    if (png_ptr == NULL || info_ptr == NULL)

   395       return;

   396 

   397    length = png_strlen(purpose) + 1;

   398    png_debug1(3, "allocating purpose for info (%lu bytes)\n",

   399      (unsigned long)length);

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

   401    if (info_ptr->pcal_purpose == NULL)

   402    {

   403        png_warning(png_ptr, "Insufficient memory for pCAL purpose.");

   404       return;

   405    }

   406    png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);

   407 

   408    png_debug(3, "storing X0, X1, type, and nparams in info\n");

   409    info_ptr->pcal_X0 = X0;

   410    info_ptr->pcal_X1 = X1;

   411    info_ptr->pcal_type = (png_byte)type;

   412    info_ptr->pcal_nparams = (png_byte)nparams;

   413 

   414    length = png_strlen(units) + 1;

   415    png_debug1(3, "allocating units for info (%lu bytes)\n",

   416      (unsigned long)length);

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

   418    if (info_ptr->pcal_units == NULL)

   419    {

   420        png_warning(png_ptr, "Insufficient memory for pCAL units.");

   421       return;

   422    }

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

   424 

   425    info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,

   426       (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));

   427    if (info_ptr->pcal_params == NULL)

   428    {

   429        png_warning(png_ptr, "Insufficient memory for pCAL params.");

   430       return;

   431    }

   432 

   433    info_ptr->pcal_params[nparams] = NULL;

   434 

   435    for (i = 0; i < nparams; i++)

   436    {

   437       length = png_strlen(params[i]) + 1;

   438       png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i,

   439         (unsigned long)length);

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

   441       if (info_ptr->pcal_params[i] == NULL)

   442       {

   443           png_warning(png_ptr, "Insufficient memory for pCAL parameter.");

   444           return;

   445       }

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

   447    }

   448 

   449    info_ptr->valid |= PNG_INFO_pCAL;

   450 #ifdef PNG_FREE_ME_SUPPORTED

   451    info_ptr->free_me |= PNG_FREE_PCAL;

   452 #endif

   453 }

   454 #endif

   455 

   456 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)

   457 #ifdef PNG_FLOATING_POINT_SUPPORTED

   458 void PNGAPI

   459 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,

   460              int unit, double width, double height)

   461 {

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

   463    if (png_ptr == NULL || info_ptr == NULL)

   464       return;

   465 

   466    info_ptr->scal_unit = (png_byte)unit;

   467    info_ptr->scal_pixel_width = width;

   468    info_ptr->scal_pixel_height = height;

   469 

   470    info_ptr->valid |= PNG_INFO_sCAL;

   471 }

   472 #else

   473 #ifdef PNG_FIXED_POINT_SUPPORTED

   474 void PNGAPI

   475 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,

   476              int unit, png_charp swidth, png_charp sheight)

   477 {

   478    png_uint_32 length;

   479 

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

   481    if (png_ptr == NULL || info_ptr == NULL)

   482       return;

   483 

   484    info_ptr->scal_unit = (png_byte)unit;

   485 

   486    length = png_strlen(swidth) + 1;

   487    png_debug1(3, "allocating unit for info (%u bytes)\n",

   488       (unsigned int)length);

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

   490    if (info_ptr->scal_s_width == NULL)

   491    {

   492       png_warning(png_ptr,

   493        "Memory allocation failed while processing sCAL.");

   494       return;

   495    }

   496    png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);

   497 

   498    length = png_strlen(sheight) + 1;

   499    png_debug1(3, "allocating unit for info (%u bytes)\n",

   500       (unsigned int)length);

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

   502    if (info_ptr->scal_s_height == NULL)

   503    {

   504       png_free (png_ptr, info_ptr->scal_s_width);

   505       info_ptr->scal_s_width = NULL;

   506       png_warning(png_ptr,

   507        "Memory allocation failed while processing sCAL.");

   508       return;

   509    }

   510    png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);

   511    info_ptr->valid |= PNG_INFO_sCAL;

   512 #ifdef PNG_FREE_ME_SUPPORTED

   513    info_ptr->free_me |= PNG_FREE_SCAL;

   514 #endif

   515 }

   516 #endif

   517 #endif

   518 #endif

   519 

   520 #if defined(PNG_pHYs_SUPPORTED)

   521 void PNGAPI

   522 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,

   523    png_uint_32 res_x, png_uint_32 res_y, int unit_type)

   524 {

   525    png_debug1(1, "in %s storage function\n", "pHYs");

   526    if (png_ptr == NULL || info_ptr == NULL)

   527       return;

   528 

   529    info_ptr->x_pixels_per_unit = res_x;

   530    info_ptr->y_pixels_per_unit = res_y;

   531    info_ptr->phys_unit_type = (png_byte)unit_type;

   532    info_ptr->valid |= PNG_INFO_pHYs;

   533 }

   534 #endif

   535 

   536 void PNGAPI

   537 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,

   538    png_colorp palette, int num_palette)

   539 {

   540 

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

   542    if (png_ptr == NULL || info_ptr == NULL)

   543       return;

   544 

   545    if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)

   546      {

   547        if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)

   548          png_error(png_ptr, "Invalid palette length");

   549        else

   550        {

   551          png_warning(png_ptr, "Invalid palette length");

   552          return;

   553        }

   554      }

   555 

   556    /*

   557     * It may not actually be necessary to set png_ptr->palette here;

   558     * we do it for backward compatibility with the way the png_handle_tRNS

   559     * function used to do the allocation.

   560     */

   561 #ifdef PNG_FREE_ME_SUPPORTED

   562    png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);

   563 #endif

   564 

   565    /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead

   566       of num_palette entries,

   567       in case of an invalid PNG file that has too-large sample values. */

   568    png_ptr->palette = (png_colorp)png_malloc(png_ptr,

   569       PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));

   570    png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *

   571       png_sizeof(png_color));

   572    png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));

   573    info_ptr->palette = png_ptr->palette;

   574    info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;

   575 

   576 #ifdef PNG_FREE_ME_SUPPORTED

   577    info_ptr->free_me |= PNG_FREE_PLTE;

   578 #else

   579    png_ptr->flags |= PNG_FLAG_FREE_PLTE;

   580 #endif

   581 

   582    info_ptr->valid |= PNG_INFO_PLTE;

   583 }

   584 

   585 #if defined(PNG_sBIT_SUPPORTED)

   586 void PNGAPI

   587 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,

   588    png_color_8p sig_bit)

   589 {

   590    png_debug1(1, "in %s storage function\n", "sBIT");

   591    if (png_ptr == NULL || info_ptr == NULL)

   592       return;

   593 

   594    png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));

   595    info_ptr->valid |= PNG_INFO_sBIT;

   596 }

   597 #endif

   598 

   599 #if defined(PNG_sRGB_SUPPORTED)

   600 void PNGAPI

   601 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)

   602 {

   603    png_debug1(1, "in %s storage function\n", "sRGB");

   604    if (png_ptr == NULL || info_ptr == NULL)

   605       return;

   606 

   607    info_ptr->srgb_intent = (png_byte)intent;

   608    info_ptr->valid |= PNG_INFO_sRGB;

   609 }

   610 

   611 void PNGAPI

   612 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,

   613    int intent)

   614 {

   615 #if defined(PNG_gAMA_SUPPORTED)

   616 #ifdef PNG_FLOATING_POINT_SUPPORTED

   617    float file_gamma;

   618 #endif

   619 #ifdef PNG_FIXED_POINT_SUPPORTED

   620    png_fixed_point int_file_gamma;

   621 #endif

   622 #endif

   623 #if defined(PNG_cHRM_SUPPORTED)

   624 #ifdef PNG_FLOATING_POINT_SUPPORTED

   625    float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;

   626 #endif

   627 #ifdef PNG_FIXED_POINT_SUPPORTED

   628    png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,

   629       int_green_y, int_blue_x, int_blue_y;

   630 #endif

   631 #endif

   632    png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");

   633    if (png_ptr == NULL || info_ptr == NULL)

   634       return;

   635 

   636    png_set_sRGB(png_ptr, info_ptr, intent);

   637 

   638 #if defined(PNG_gAMA_SUPPORTED)

   639 #ifdef PNG_FLOATING_POINT_SUPPORTED

   640    file_gamma = (float).45455;

   641    png_set_gAMA(png_ptr, info_ptr, file_gamma);

   642 #endif

   643 #ifdef PNG_FIXED_POINT_SUPPORTED

   644    int_file_gamma = 45455L;

   645    png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);

   646 #endif

   647 #endif

   648 

   649 #if defined(PNG_cHRM_SUPPORTED)

   650 #ifdef PNG_FIXED_POINT_SUPPORTED

   651    int_white_x = 31270L;

   652    int_white_y = 32900L;

   653    int_red_x   = 64000L;

   654    int_red_y   = 33000L;

   655    int_green_x = 30000L;

   656    int_green_y = 60000L;

   657    int_blue_x  = 15000L;

   658    int_blue_y  =  6000L;

   659 

   660    png_set_cHRM_fixed(png_ptr, info_ptr,

   661       int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,

   662       int_blue_x, int_blue_y);

   663 #endif

   664 #ifdef PNG_FLOATING_POINT_SUPPORTED

   665    white_x = (float).3127;

   666    white_y = (float).3290;

   667    red_x   = (float).64;

   668    red_y   = (float).33;

   669    green_x = (float).30;

   670    green_y = (float).60;

   671    blue_x  = (float).15;

   672    blue_y  = (float).06;

   673 

   674    png_set_cHRM(png_ptr, info_ptr,

   675       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);

   676 #endif

   677 #endif

   678 }

   679 #endif

   680 

   681 

   682 #if defined(PNG_iCCP_SUPPORTED)

   683 void PNGAPI

   684 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,

   685              png_charp name, int compression_type,

   686              png_charp profile, png_uint_32 proflen)

   687 {

   688    png_charp new_iccp_name;

   689    png_charp new_iccp_profile;

   690    png_uint_32 length;

   691 

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

   693    if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)

   694       return;

   695 

   696    length = png_strlen(name)+1;

   697    new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);

   698    if (new_iccp_name == NULL)

   699    {

   700       png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");

   701       return;

   702    }

   703    png_memcpy(new_iccp_name, name, length);

   704    new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);

   705    if (new_iccp_profile == NULL)

   706    {

   707       png_free (png_ptr, new_iccp_name);

   708       png_warning(png_ptr,

   709       "Insufficient memory to process iCCP profile.");

   710       return;

   711    }

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

   713 

   714    png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);

   715 

   716    info_ptr->iccp_proflen = proflen;

   717    info_ptr->iccp_name = new_iccp_name;

   718    info_ptr->iccp_profile = new_iccp_profile;

   719    /* Compression is always zero but is here so the API and info structure

   720     * does not have to change if we introduce multiple compression types */

   721    info_ptr->iccp_compression = (png_byte)compression_type;

   722 #ifdef PNG_FREE_ME_SUPPORTED

   723    info_ptr->free_me |= PNG_FREE_ICCP;

   724 #endif

   725    info_ptr->valid |= PNG_INFO_iCCP;

   726 }

   727 #endif

   728 

   729 #if defined(PNG_TEXT_SUPPORTED)

   730 void PNGAPI

   731 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,

   732    int num_text)

   733 {

   734    int ret;

   735    ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);

   736    if (ret)

   737      png_error(png_ptr, "Insufficient memory to store text");

   738 }

   739 

   740 int /* PRIVATE */

   741 png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,

   742    int num_text)

   743 {

   744    int i;

   745 

   746    png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?

   747       "text" : (png_const_charp)png_ptr->chunk_name));

   748 

   749    if (png_ptr == NULL || info_ptr == NULL || num_text == 0)

   750       return(0);

   751 

   752    /* Make sure we have enough space in the "text" array in info_struct

   753     * to hold all of the incoming text_ptr objects.

   754     */

   755    if (info_ptr->num_text + num_text > info_ptr->max_text)

   756    {

   757       if (info_ptr->text != NULL)

   758       {

   759          png_textp old_text;

   760          int old_max;

   761 

   762          old_max = info_ptr->max_text;

   763          info_ptr->max_text = info_ptr->num_text + num_text + 8;

   764          old_text = info_ptr->text;

   765          info_ptr->text = (png_textp)png_malloc_warn(png_ptr,

   766             (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));

   767          if (info_ptr->text == NULL)

   768            {

   769              png_free(png_ptr, old_text);

   770              return(1);

   771            }

   772          png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *

   773             png_sizeof(png_text)));

   774          png_free(png_ptr, old_text);

   775       }

   776       else

   777       {

   778          info_ptr->max_text = num_text + 8;

   779          info_ptr->num_text = 0;

   780          info_ptr->text = (png_textp)png_malloc_warn(png_ptr,

   781             (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));

   782          if (info_ptr->text == NULL)

   783            return(1);

   784 #ifdef PNG_FREE_ME_SUPPORTED

   785          info_ptr->free_me |= PNG_FREE_TEXT;

   786 #endif

   787       }

   788       png_debug1(3, "allocated %d entries for info_ptr->text\n",

   789          info_ptr->max_text);

   790    }

   791    for (i = 0; i < num_text; i++)

   792    {

   793       png_size_t text_length, key_len;

   794       png_size_t lang_len, lang_key_len;

   795       png_textp textp = &(info_ptr->text[info_ptr->num_text]);

   796 

   797       if (text_ptr[i].key == NULL)

   798           continue;

   799 

   800       key_len = png_strlen(text_ptr[i].key);

   801 

   802       if (text_ptr[i].compression <= 0)

   803       {

   804         lang_len = 0;

   805         lang_key_len = 0;

   806       }

   807       else

   808 #ifdef PNG_iTXt_SUPPORTED

   809       {

   810         /* set iTXt data */

   811         if (text_ptr[i].lang != NULL)

   812           lang_len = png_strlen(text_ptr[i].lang);

   813         else

   814           lang_len = 0;

   815         if (text_ptr[i].lang_key != NULL)

   816           lang_key_len = png_strlen(text_ptr[i].lang_key);

   817         else

   818           lang_key_len = 0;

   819       }

   820 #else

   821       {

   822         png_warning(png_ptr, "iTXt chunk not supported.");

   823         continue;

   824       }

   825 #endif

   826 

   827       if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')

   828       {

   829          text_length = 0;

   830 #ifdef PNG_iTXt_SUPPORTED

   831          if (text_ptr[i].compression > 0)

   832             textp->compression = PNG_ITXT_COMPRESSION_NONE;

   833          else

   834 #endif

   835             textp->compression = PNG_TEXT_COMPRESSION_NONE;

   836       }

   837       else

   838       {

   839          text_length = png_strlen(text_ptr[i].text);

   840          textp->compression = text_ptr[i].compression;

   841       }

   842 

   843       textp->key = (png_charp)png_malloc_warn(png_ptr,

   844          (png_uint_32)

   845          (key_len + text_length + lang_len + lang_key_len + 4));

   846       if (textp->key == NULL)

   847         return(1);

   848       png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",

   849          (png_uint_32)

   850          (key_len + lang_len + lang_key_len + text_length + 4),

   851          (int)textp->key);

   852 

   853       png_memcpy(textp->key, text_ptr[i].key,

   854          (png_size_t)(key_len));

   855       *(textp->key + key_len) = '\0';

   856 #ifdef PNG_iTXt_SUPPORTED

   857       if (text_ptr[i].compression > 0)

   858       {

   859          textp->lang = textp->key + key_len + 1;

   860          png_memcpy(textp->lang, text_ptr[i].lang, lang_len);

   861          *(textp->lang + lang_len) = '\0';

   862          textp->lang_key = textp->lang + lang_len + 1;

   863          png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);

   864          *(textp->lang_key + lang_key_len) = '\0';

   865          textp->text = textp->lang_key + lang_key_len + 1;

   866       }

   867       else

   868 #endif

   869       {

   870 #ifdef PNG_iTXt_SUPPORTED

   871          textp->lang=NULL;

   872          textp->lang_key=NULL;

   873 #endif

   874          textp->text = textp->key + key_len + 1;

   875       }

   876       if (text_length)

   877          png_memcpy(textp->text, text_ptr[i].text,

   878             (png_size_t)(text_length));

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

   880 

   881 #ifdef PNG_iTXt_SUPPORTED

   882       if (textp->compression > 0)

   883       {

   884          textp->text_length = 0;

   885          textp->itxt_length = text_length;

   886       }

   887       else

   888 #endif

   889       {

   890          textp->text_length = text_length;

   891 #ifdef PNG_iTXt_SUPPORTED

   892          textp->itxt_length = 0;

   893 #endif

   894       }

   895       info_ptr->num_text++;

   896       png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);

   897    }

   898    return(0);

   899 }

   900 #endif

   901 

   902 #if defined(PNG_tIME_SUPPORTED)

   903 void PNGAPI

   904 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)

   905 {

   906    png_debug1(1, "in %s storage function\n", "tIME");

   907    if (png_ptr == NULL || info_ptr == NULL ||

   908        (png_ptr->mode & PNG_WROTE_tIME))

   909       return;

   910 

   911    png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));

   912    info_ptr->valid |= PNG_INFO_tIME;

   913 }

   914 #endif

   915 

   916 #if defined(PNG_tRNS_SUPPORTED)

   917 void PNGAPI

   918 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,

   919    png_bytep trans, int num_trans, png_color_16p trans_values)

   920 {

   921    png_debug1(1, "in %s storage function\n", "tRNS");

   922    if (png_ptr == NULL || info_ptr == NULL)

   923       return;

   924 

   925    if (trans != NULL)

   926    {

   927        /*

   928         * It may not actually be necessary to set png_ptr->trans here;

   929         * we do it for backward compatibility with the way the png_handle_tRNS

   930         * function used to do the allocation.

   931         */

   932 

   933 #ifdef PNG_FREE_ME_SUPPORTED

   934        png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);

   935 #endif

   936 

   937        /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */

   938        png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,

   939            (png_uint_32)PNG_MAX_PALETTE_LENGTH);

   940        if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)

   941          png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);

   942    }

   943 

   944    if (trans_values != NULL)

   945    {

   946       int sample_max = (1 << info_ptr->bit_depth);

   947       if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&

   948           (int)trans_values->gray > sample_max) ||

   949           (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&

   950           ((int)trans_values->red > sample_max ||

   951           (int)trans_values->green > sample_max ||

   952           (int)trans_values->blue > sample_max)))

   953         png_warning(png_ptr,

   954            "tRNS chunk has out-of-range samples for bit_depth");

   955       png_memcpy(&(info_ptr->trans_values), trans_values,

   956          png_sizeof(png_color_16));

   957       if (num_trans == 0)

   958         num_trans = 1;

   959    }

   960 

   961    info_ptr->num_trans = (png_uint_16)num_trans;

   962    if (num_trans != 0)

   963    {

   964       info_ptr->valid |= PNG_INFO_tRNS;

   965 #ifdef PNG_FREE_ME_SUPPORTED

   966       info_ptr->free_me |= PNG_FREE_TRNS;

   967 #else

   968       png_ptr->flags |= PNG_FLAG_FREE_TRNS;

   969 #endif

   970    }

   971 }

   972 #endif

   973 

   974 #if defined(PNG_sPLT_SUPPORTED)

   975 void PNGAPI

   976 png_set_sPLT(png_structp png_ptr,

   977              png_infop info_ptr, png_sPLT_tp entries, int nentries)

   978 /*

   979  *  entries        - array of png_sPLT_t structures

   980  *                   to be added to the list of palettes

   981  *                   in the info structure.

   982  *  nentries       - number of palette structures to be

   983  *                   added.

   984  */

   985 {

   986     png_sPLT_tp np;

   987     int i;

   988 

   989     if (png_ptr == NULL || info_ptr == NULL)

   990        return;

   991 

   992     np = (png_sPLT_tp)png_malloc_warn(png_ptr,

   993         (info_ptr->splt_palettes_num + nentries) *

   994         (png_uint_32)png_sizeof(png_sPLT_t));

   995     if (np == NULL)

   996     {

   997       png_warning(png_ptr, "No memory for sPLT palettes.");

   998       return;

   999     }

  1000 

  1001     png_memcpy(np, info_ptr->splt_palettes,

  1002            info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));

  1003     png_free(png_ptr, info_ptr->splt_palettes);

  1004     info_ptr->splt_palettes=NULL;

  1005 

  1006     for (i = 0; i < nentries; i++)

  1007     {

  1008         png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;

  1009         png_sPLT_tp from = entries + i;

  1010         png_uint_32 length;

  1011 

  1012         length = png_strlen(from->name) + 1;

  1013         to->name = (png_charp)png_malloc_warn(png_ptr, length);

  1014         if (to->name == NULL)

  1015         {

  1016            png_warning(png_ptr,

  1017              "Out of memory while processing sPLT chunk");

  1018            continue;

  1019         }

  1020         png_memcpy(to->name, from->name, length);

  1021         to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,

  1022             (png_uint_32)(from->nentries * png_sizeof(png_sPLT_entry)));

  1023         if (to->entries == NULL)

  1024         {

  1025            png_warning(png_ptr,

  1026              "Out of memory while processing sPLT chunk");

  1027            png_free(png_ptr, to->name);

  1028            to->name = NULL;

  1029            continue;

  1030         }

  1031         png_memcpy(to->entries, from->entries,

  1032             from->nentries * png_sizeof(png_sPLT_entry));

  1033         to->nentries = from->nentries;

  1034         to->depth = from->depth;

  1035     }

  1036 

  1037     info_ptr->splt_palettes = np;

  1038     info_ptr->splt_palettes_num += nentries;

  1039     info_ptr->valid |= PNG_INFO_sPLT;

  1040 #ifdef PNG_FREE_ME_SUPPORTED

  1041     info_ptr->free_me |= PNG_FREE_SPLT;

  1042 #endif

  1043 }

  1044 #endif /* PNG_sPLT_SUPPORTED */

  1045 

  1046 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)

  1047 void PNGAPI

  1048 png_set_unknown_chunks(png_structp png_ptr,

  1049    png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)

  1050 {

  1051     png_unknown_chunkp np;

  1052     int i;

  1053 

  1054     if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)

  1055         return;

  1056 

  1057     np = (png_unknown_chunkp)png_malloc_warn(png_ptr,

  1058         (png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *

  1059         png_sizeof(png_unknown_chunk)));

  1060     if (np == NULL)

  1061     {

  1062        png_warning(png_ptr,

  1063           "Out of memory while processing unknown chunk.");

  1064        return;

  1065     }

  1066 

  1067     png_memcpy(np, info_ptr->unknown_chunks,

  1068            info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));

  1069     png_free(png_ptr, info_ptr->unknown_chunks);

  1070     info_ptr->unknown_chunks=NULL;

  1071 

  1072     for (i = 0; i < num_unknowns; i++)

  1073     {

  1074        png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;

  1075        png_unknown_chunkp from = unknowns + i;

  1076 

  1077        png_memcpy((png_charp)to->name, 

  1078                   (png_charp)from->name, 

  1079                   png_sizeof(from->name));

  1080        to->name[png_sizeof(to->name)-1] = '\0';

  1081        to->size = from->size;

  1082        /* note our location in the read or write sequence */

  1083        to->location = (png_byte)(png_ptr->mode & 0xff);

  1084 

  1085        if (from->size == 0)

  1086           to->data=NULL;

  1087        else

  1088        {

  1089           to->data = (png_bytep)png_malloc_warn(png_ptr,

  1090             (png_uint_32)from->size);

  1091           if (to->data == NULL)

  1092           {

  1093              png_warning(png_ptr,

  1094               "Out of memory while processing unknown chunk.");

  1095              to->size = 0;

  1096           }

  1097           else

  1098              png_memcpy(to->data, from->data, from->size);

  1099        }

  1100     }

  1101 

  1102     info_ptr->unknown_chunks = np;

  1103     info_ptr->unknown_chunks_num += num_unknowns;

  1104 #ifdef PNG_FREE_ME_SUPPORTED

  1105     info_ptr->free_me |= PNG_FREE_UNKN;

  1106 #endif

  1107 }

  1108 void PNGAPI

  1109 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,

  1110    int chunk, int location)

  1111 {

  1112    if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <

  1113          (int)info_ptr->unknown_chunks_num)

  1114       info_ptr->unknown_chunks[chunk].location = (png_byte)location;

  1115 }

  1116 #endif

  1117 

  1118 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)

  1119 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \

  1120     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)

  1121 void PNGAPI

  1122 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)

  1123 {

  1124    /* This function is deprecated in favor of png_permit_mng_features()

  1125       and will be removed from libpng-1.3.0 */

  1126    png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");

  1127    if (png_ptr == NULL)

  1128       return;

  1129    png_ptr->mng_features_permitted = (png_byte)

  1130      ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) |

  1131      ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));

  1132 }

  1133 #endif

  1134 #endif

  1135