source: liacs/MIR2010/SourceCode/cximage/png/pngset.c@ 422

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

 *

 * Last changed in libpng 1.2.17 May 15, 2007

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

 * Copyright (c) 1998-2007 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.)

 *

 * 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.

 */



#define PNG_INTERNAL

#include "png.h"



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



#if defined(PNG_bKGD_SUPPORTED)

void PNGAPI

png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)

{

   png_debug1(1, "in %s storage function\n", "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



#if defined(PNG_cHRM_SUPPORTED)

#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_debug1(1, "in %s storage function\n", "cHRM");

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

      return;



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

         red_x < 0.0 ||   red_y < 0.0 ||

       green_x < 0.0 || green_y < 0.0 ||

        blue_x < 0.0 ||  blue_y < 0.0)

   {

      png_warning(png_ptr,

        "Ignoring attempt to set negative chromaticity value");

      return;

   }

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

         red_x > 21474.83 ||   red_y > 21474.83 ||

       green_x > 21474.83 || green_y > 21474.83 ||

        blue_x > 21474.83 ||  blue_y > 21474.83)

   {

      png_warning(png_ptr,

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

      return;

   }



   info_ptr->x_white = (float)white_x;

   info_ptr->y_white = (float)white_y;

   info_ptr->x_red   = (float)red_x;

   info_ptr->y_red   = (float)red_y;

   info_ptr->x_green = (float)green_x;

   info_ptr->y_green = (float)green_y;

   info_ptr->x_blue  = (float)blue_x;

   info_ptr->y_blue  = (float)blue_y;

#ifdef PNG_FIXED_POINT_SUPPORTED

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

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

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

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

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

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

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

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

#endif

   info_ptr->valid |= PNG_INFO_cHRM;

}

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

void PNGAPI

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\n", "cHRM");

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

      return;



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

         red_x < 0 ||   red_y < 0 ||

       green_x < 0 || green_y < 0 ||

        blue_x < 0 ||  blue_y < 0)

   {

      png_warning(png_ptr,

        "Ignoring attempt to set negative chromaticity value");

      return;

   }

#ifdef PNG_FLOATING_POINT_SUPPORTED

   if (white_x > (double) PNG_UINT_31_MAX ||

       white_y > (double) PNG_UINT_31_MAX ||

         red_x > (double) PNG_UINT_31_MAX ||

         red_y > (double) PNG_UINT_31_MAX ||

       green_x > (double) PNG_UINT_31_MAX ||

       green_y > (double) PNG_UINT_31_MAX ||

        blue_x > (double) PNG_UINT_31_MAX ||

        blue_y > (double) PNG_UINT_31_MAX)

#else

   if (white_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||

       white_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||

         red_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||

         red_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||

       green_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||

       green_y > (png_fixed_point) PNG_UINT_31_MAX/100000L ||

        blue_x > (png_fixed_point) PNG_UINT_31_MAX/100000L ||

        blue_y > (png_fixed_point) PNG_UINT_31_MAX/100000L)

#endif

   {

      png_warning(png_ptr,

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

      return;

   }

   info_ptr->int_x_white = white_x;

   info_ptr->int_y_white = white_y;

   info_ptr->int_x_red   = red_x;

   info_ptr->int_y_red   = red_y;

   info_ptr->int_x_green = green_x;

   info_ptr->int_y_green = green_y;

   info_ptr->int_x_blue  = blue_x;

   info_ptr->int_y_blue  = blue_y;

#ifdef PNG_FLOATING_POINT_SUPPORTED

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

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

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

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

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

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

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

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

#endif

   info_ptr->valid |= PNG_INFO_cHRM;

}

#endif

#endif



#if defined(PNG_gAMA_SUPPORTED)

#ifdef PNG_FLOATING_POINT_SUPPORTED

void PNGAPI

png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)

{

   double gamma;

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

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

      return;



   /* Check for overflow */

   if (file_gamma > 21474.83)

   {

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

      gamma=21474.83;

   }

   else

      gamma=file_gamma;

   info_ptr->gamma = (float)gamma;

#ifdef PNG_FIXED_POINT_SUPPORTED

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

#endif

   info_ptr->valid |= PNG_INFO_gAMA;

   if(gamma == 0.0)

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

}

#endif

void PNGAPI

png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point

   int_gamma)

{

   png_fixed_point gamma;



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

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

      return;



   if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)

   {

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

     gamma=PNG_UINT_31_MAX;

   }

   else

   {

     if (int_gamma < 0)

     {

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

       gamma=0;

     }

     else

       gamma=int_gamma;

   }

#ifdef PNG_FLOATING_POINT_SUPPORTED

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

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

   info_ptr->int_gamma = gamma;

#endif

   info_ptr->valid |= PNG_INFO_gAMA;

   if(gamma == 0)

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

}

#endif



#if defined(PNG_hIST_SUPPORTED)

void PNGAPI

png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)

{

   int i;



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

   }



#ifdef PNG_FREE_ME_SUPPORTED

   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);

#endif

   /* 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_uint_32)(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;



#ifdef PNG_FREE_ME_SUPPORTED

   info_ptr->free_me |= PNG_FREE_HIST;

#else

   png_ptr->flags |= PNG_FLAG_FREE_HIST;

#endif

}

#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\n", "IHDR");

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

      return;



   /* check for width and height valid values */

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

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

#ifdef PNG_SET_USER_LIMITS_SUPPORTED

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

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

#else

   if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)

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

#endif

   if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)

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

   if ( width > (PNG_UINT_32_MAX

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

                 - 64       /* bigrowbuf hack */

                 - 1        /* filter byte */

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

                 - 8)       /* extra max_pixel_depth pad */

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



   /* check other values */

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

      bit_depth != 8 && bit_depth != 16)

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



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

      color_type == 5 || color_type > 6)

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



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

       ((color_type == PNG_COLOR_TYPE_RGB ||

         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||

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

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



   if (interlace_type >= PNG_INTERLACE_LAST)

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



   if (compression_type != PNG_COMPRESSION_TYPE_BASE)

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



#if defined(PNG_MNG_FEATURES_SUPPORTED)

   /* Accept filter_method 64 (intrapixel differencing) only if

    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and

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

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

    * 3. The application called png_permit_mng_features with a mask that

    *    included PNG_FLAG_MNG_FILTER_64 and

    * 4. The filter_method is 64 and

    * 5. The color_type is RGB or RGBA

    */

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

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

   if(filter_type != PNG_FILTER_TYPE_BASE)

   {

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

        (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&

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

        (color_type == PNG_COLOR_TYPE_RGB ||

         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))

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

     if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)

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

   }

#else

   if(filter_type != PNG_FILTER_TYPE_BASE)

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

#endif



   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;

   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);



   /* check for potential overflow */

   if ( width > (PNG_UINT_32_MAX

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

                 - 64       /* bigrowbuf hack */

                 - 1        /* filter byte */

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

                 - 8)       /* extra max_pixel_depth pad */

      info_ptr->rowbytes = (png_size_t)0;

   else

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

}



#if defined(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\n", "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



#if defined(PNG_pCAL_SUPPORTED)

void PNGAPI

png_set_pCAL(png_structp png_ptr, png_infop info_ptr,

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

   png_charp units, png_charpp params)

{

   png_uint_32 length;

   int i;



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

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

      return;



   length = png_strlen(purpose) + 1;

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

   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, purpose, (png_size_t)length);



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

   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)\n", 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, (png_size_t)length);



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

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

   if (info_ptr->pcal_params == NULL)

     {

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

       return;

     }



   info_ptr->pcal_params[nparams] = NULL;



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

   {

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

      png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, 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], (png_size_t)length);

   }



   info_ptr->valid |= PNG_INFO_pCAL;

#ifdef PNG_FREE_ME_SUPPORTED

   info_ptr->free_me |= PNG_FREE_PCAL;

#endif

}

#endif



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

#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\n", "sCAL");

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

      return;



   info_ptr->scal_unit = (png_byte)unit;

   info_ptr->scal_pixel_width = width;

   info_ptr->scal_pixel_height = height;



   info_ptr->valid |= PNG_INFO_sCAL;

}

#else

#ifdef PNG_FIXED_POINT_SUPPORTED

void PNGAPI

png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,

             int unit, png_charp swidth, png_charp sheight)

{

   png_uint_32 length;



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

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

      return;



   info_ptr->scal_unit = (png_byte)unit;



   length = png_strlen(swidth) + 1;

   png_debug1(3, "allocating unit for info (%d bytes)\n", length);

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

   if (info_ptr->scal_s_width == NULL)

   {

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

   }

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



   length = png_strlen(sheight) + 1;

   png_debug1(3, "allocating unit for info (%d bytes)\n", length);

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

   if (info_ptr->scal_s_height == NULL)

   {

      png_free (png_ptr, info_ptr->scal_s_width);

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

   }

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



   info_ptr->valid |= PNG_INFO_sCAL;

#ifdef PNG_FREE_ME_SUPPORTED

   info_ptr->free_me |= PNG_FREE_SCAL;

#endif

}

#endif

#endif

#endif



#if defined(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\n", "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_colorp palette, int num_palette)

{



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

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

      return;



   if (num_palette < 0 || num_palette > PNG_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.

    */

#ifdef PNG_FREE_ME_SUPPORTED

   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);

#endif



   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead

      of num_palette entries,

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

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

      PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));

   png_memset(png_ptr->palette, 0, 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;



#ifdef PNG_FREE_ME_SUPPORTED

   info_ptr->free_me |= PNG_FREE_PLTE;

#else

   png_ptr->flags |= PNG_FLAG_FREE_PLTE;

#endif



   info_ptr->valid |= PNG_INFO_PLTE;

}



#if defined(PNG_sBIT_SUPPORTED)

void PNGAPI

png_set_sBIT(png_structp png_ptr, png_infop info_ptr,

   png_color_8p sig_bit)

{

   png_debug1(1, "in %s storage function\n", "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



#if defined(PNG_sRGB_SUPPORTED)

void PNGAPI

png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)

{

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

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

      return;



   info_ptr->srgb_intent = (png_byte)intent;

   info_ptr->valid |= PNG_INFO_sRGB;

}



void PNGAPI

png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,

   int intent)

{

#if defined(PNG_gAMA_SUPPORTED)

#ifdef PNG_FLOATING_POINT_SUPPORTED

   float file_gamma;

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

   png_fixed_point int_file_gamma;

#endif

#endif

#if defined(PNG_cHRM_SUPPORTED)

#ifdef PNG_FLOATING_POINT_SUPPORTED

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

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,

      int_green_y, int_blue_x, int_blue_y;

#endif

#endif

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

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

      return;



   png_set_sRGB(png_ptr, info_ptr, intent);



#if defined(PNG_gAMA_SUPPORTED)

#ifdef PNG_FLOATING_POINT_SUPPORTED

   file_gamma = (float).45455;

   png_set_gAMA(png_ptr, info_ptr, file_gamma);

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

   int_file_gamma = 45455L;

   png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);

#endif

#endif



#if defined(PNG_cHRM_SUPPORTED)

#ifdef PNG_FIXED_POINT_SUPPORTED

   int_white_x = 31270L;

   int_white_y = 32900L;

   int_red_x   = 64000L;

   int_red_y   = 33000L;

   int_green_x = 30000L;

   int_green_y = 60000L;

   int_blue_x  = 15000L;

   int_blue_y  =  6000L;



   png_set_cHRM_fixed(png_ptr, info_ptr,

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

      int_blue_x, int_blue_y);

#endif

#ifdef PNG_FLOATING_POINT_SUPPORTED

   white_x = (float).3127;

   white_y = (float).3290;

   red_x   = (float).64;

   red_y   = (float).33;

   green_x = (float).30;

   green_y = (float).60;

   blue_x  = (float).15;

   blue_y  = (float).06;



   png_set_cHRM(png_ptr, info_ptr,

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

#endif

#endif

}

#endif





#if defined(PNG_iCCP_SUPPORTED)

void PNGAPI

png_set_iCCP(png_structp png_ptr, png_infop info_ptr,

             png_charp name, int compression_type,

             png_charp profile, png_uint_32 proflen)

{

   png_charp new_iccp_name;

   png_charp new_iccp_profile;



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

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

      return;



   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, png_strlen(name)+1);

   if (new_iccp_name == NULL)

   {

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

      return;

   }

   png_strcpy(new_iccp_name, name);

   new_iccp_profile = (png_charp)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;

#ifdef PNG_FREE_ME_SUPPORTED

   info_ptr->free_me |= PNG_FREE_ICCP;

#endif

   info_ptr->valid |= PNG_INFO_iCCP;

}

#endif



#if defined(PNG_TEXT_SUPPORTED)

void PNGAPI

png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,

   int num_text)

{

   int ret;

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

   if (ret)

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

}



int /* PRIVATE */

png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,

   int num_text)

{

   int i;



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

      "text" : (png_const_charp)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.

    */

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

   {

      if (info_ptr->text != NULL)

      {

         png_textp old_text;

         int old_max;



         old_max = info_ptr->max_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_uint_32)(info_ptr->max_text * png_sizeof (png_text)));

         if (info_ptr->text == NULL)

           {

             png_free(png_ptr, old_text);

             return(1);

           }

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

            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_uint_32)(info_ptr->max_text * png_sizeof (png_text)));

         if (info_ptr->text == NULL)

           return(1);

#ifdef PNG_FREE_ME_SUPPORTED

         info_ptr->free_me |= PNG_FREE_TEXT;

#endif

      }

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

         info_ptr->max_text);

   }

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

   {

      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;



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



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

      {

        lang_len = 0;

        lang_key_len = 0;

      }

      else

#ifdef PNG_iTXt_SUPPORTED

      {

        /* set iTXt data */

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

          lang_len = png_strlen(text_ptr[i].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_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_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));

      if (textp->key == NULL)

        return(1);

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

         (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),

         (int)textp->key);



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

         (png_size_t)(key_len));

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

#ifdef PNG_iTXt_SUPPORTED

      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

#endif

      {

#ifdef PNG_iTXt_SUPPORTED

         textp->lang=NULL;

         textp->lang_key=NULL;

#endif

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

      }

      if(text_length)

         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;

#ifdef PNG_iTXt_SUPPORTED

         textp->itxt_length = 0;

#endif

      }

#if 0 /* appears to be redundant; */

      info_ptr->text[info_ptr->num_text]= *textp;

#endif

      info_ptr->num_text++;

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

   }

   return(0);

}

#endif



#if defined(PNG_tIME_SUPPORTED)

void PNGAPI

png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)

{

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

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

       (png_ptr->mode & PNG_WROTE_tIME))

      return;



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

   info_ptr->valid |= PNG_INFO_tIME;

}

#endif



#if defined(PNG_tRNS_SUPPORTED)

void PNGAPI

png_set_tRNS(png_structp png_ptr, png_infop info_ptr,

   png_bytep trans, int num_trans, png_color_16p trans_values)

{

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

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

      return;



   if (trans != NULL)

   {

       /*

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

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

        * function used to do the allocation.

        */

#ifdef PNG_FREE_ME_SUPPORTED

       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);

#endif

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

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

           (png_uint_32)PNG_MAX_PALETTE_LENGTH);

       if (num_trans <= PNG_MAX_PALETTE_LENGTH)

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

#ifdef PNG_FREE_ME_SUPPORTED

       info_ptr->free_me |= PNG_FREE_TRNS;

#else

       png_ptr->flags |= PNG_FLAG_FREE_TRNS;

#endif

   }



   if (trans_values != NULL)

   {

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

         png_sizeof(png_color_16));

      if (num_trans == 0)

        num_trans = 1;

   }

   info_ptr->num_trans = (png_uint_16)num_trans;

   info_ptr->valid |= PNG_INFO_tRNS;

}

#endif



#if defined(PNG_sPLT_SUPPORTED)

void PNGAPI

png_set_sPLT(png_structp png_ptr,

             png_infop info_ptr, png_sPLT_tp entries, int nentries)

{

    png_sPLT_tp np;

    int i;



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

       return;



    np = (png_sPLT_tp)png_malloc_warn(png_ptr,

        (info_ptr->splt_palettes_num + nentries) * 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 = 0; i < nentries; i++)

    {

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

        png_sPLT_tp from = entries + i;



        to->name = (png_charp)png_malloc(png_ptr,

            png_strlen(from->name) + 1);

        /* TODO: use png_malloc_warn */

        png_strcpy(to->name, from->name);

        to->entries = (png_sPLT_entryp)png_malloc(png_ptr,

            from->nentries * png_sizeof(png_sPLT_entry));

        /* TODO: use png_malloc_warn */

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

            from->nentries * png_sizeof(png_sPLT_entry));

        to->nentries = from->nentries;

        to->depth = from->depth;

    }



    info_ptr->splt_palettes = np;

    info_ptr->splt_palettes_num += nentries;

    info_ptr->valid |= PNG_INFO_sPLT;

#ifdef PNG_FREE_ME_SUPPORTED

    info_ptr->free_me |= PNG_FREE_SPLT;

#endif

}

#endif /* PNG_sPLT_SUPPORTED */



#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)

void PNGAPI

png_set_unknown_chunks(png_structp png_ptr,

   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)

{

    png_unknown_chunkp np;

    int i;



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

        return;



    np = (png_unknown_chunkp)png_malloc_warn(png_ptr,

        (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,

           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_unknown_chunkp from = unknowns + i;



        png_strncpy((png_charp)to->name, (png_charp)from->name, 5);

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

        if (to->data == NULL)

        {

           png_warning(png_ptr, "Out of memory processing unknown chunk.");

        }

        else

        {

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

           to->size = from->size;



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

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

        }

    }



    info_ptr->unknown_chunks = np;

    info_ptr->unknown_chunks_num += num_unknowns;

#ifdef PNG_FREE_ME_SUPPORTED

    info_ptr->free_me |= PNG_FREE_UNKN;

#endif

}

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 <

         (int)info_ptr->unknown_chunks_num)

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

}

#endif



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

#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \

    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)

void PNGAPI

png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)

{

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

      and will be removed from libpng-1.3.0 */

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

   if (png_ptr == NULL)

      return;

   png_ptr->mng_features_permitted = (png_byte)

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

     ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));

}

#endif

#endif



#if defined(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\n");

   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



#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)

void PNGAPI

png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_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_uint_32)(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;

#ifdef PNG_FREE_ME_SUPPORTED

    png_ptr->free_me |= PNG_FREE_LIST;

#endif

}

#endif



#if defined(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\n");

   if (png_ptr == NULL)

      return;

   png_ptr->read_user_chunk_fn = read_user_chunk_fn;

   png_ptr->user_chunk_ptr = user_chunk_ptr;

}

#endif



#if defined(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\n", "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)

      info_ptr->valid |= PNG_INFO_IDAT;

}

#endif



#ifdef PNG_WRITE_SUPPORTED

void PNGAPI

png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)

{

    if (png_ptr == NULL)

       return;

    if(png_ptr->zbuf)

       png_free(png_ptr, png_ptr->zbuf);

    png_ptr->zbuf_size = (png_size_t)size;

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

    png_ptr->zstream.next_out = png_ptr->zbuf;

    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;

}

#endif



void PNGAPI

png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)

{

   if (png_ptr && info_ptr)

      info_ptr->valid &= ~(mask);

}





#ifndef PNG_1_0_X

#ifdef PNG_ASSEMBLER_CODE_SUPPORTED

/* this function was added to libpng 1.2.0 and should always exist by default */

void PNGAPI

png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)

{

#ifdef PNG_MMX_CODE_SUPPORTED

    png_uint_32 settable_asm_flags;

    png_uint_32 settable_mmx_flags;

#endif

    if (png_ptr == NULL)

       return;

#ifdef PNG_MMX_CODE_SUPPORTED



    settable_mmx_flags =

#ifdef PNG_HAVE_MMX_COMBINE_ROW

                         PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |

#endif

#ifdef PNG_HAVE_MMX_READ_INTERLACE

                         PNG_ASM_FLAG_MMX_READ_INTERLACE    |

#endif

#ifdef PNG_HAVE_MMX_READ_FILTER_ROW

                         PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |

                         PNG_ASM_FLAG_MMX_READ_FILTER_UP    |

                         PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |

                         PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |

#endif

                         0;



    /* could be some non-MMX ones in the future, but not currently: */

    settable_asm_flags = settable_mmx_flags;



    if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||

        !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))

    {

        /* clear all MMX flags if MMX isn't supported */

        settable_asm_flags &= ~settable_mmx_flags;

        png_ptr->asm_flags &= ~settable_mmx_flags;

    }



    /* we're replacing the settable bits with those passed in by the user,

     * so first zero them out of the master copy, then bitwise-OR in the

     * allowed subset that was requested */



    png_ptr->asm_flags &= ~settable_asm_flags;               /* zero them */

    png_ptr->asm_flags |= (asm_flags & settable_asm_flags);  /* set them */

#endif /* ?PNG_MMX_CODE_SUPPORTED */

}



/* this function was added to libpng 1.2.0 */

void PNGAPI

png_set_mmx_thresholds (png_structp png_ptr,

                        png_byte mmx_bitdepth_threshold,

                        png_uint_32 mmx_rowbytes_threshold)

{

    if (png_ptr == NULL)

       return;

#ifdef PNG_MMX_CODE_SUPPORTED

    png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;

    png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;

#endif /* ?PNG_MMX_CODE_SUPPORTED */

}

#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */



#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 0x7ffffffL.

     */

    if(png_ptr == NULL) return;

    png_ptr->user_width_max = user_width_max;

    png_ptr->user_height_max = user_height_max;

}

#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */



#endif /* ?PNG_1_0_X */

#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */