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

 *

 * Last changed in libpng 1.2.40 [September 10, 2009]

 * Copyright (c) 1998-2009 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.

 */

#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", "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", "cHRM");

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

      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 /* PNG_FLOATING_POINT_SUPPORTED */

#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", "cHRM fixed");

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

      return;

#if !defined(PNG_NO_CHECK_cHRM)

   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->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 /* PNG_FIXED_POINT_SUPPORTED */

#endif /* PNG_cHRM_SUPPORTED */

#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 png_gamma;

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

      png_gamma=21474.83;

   }

   else

      png_gamma = file_gamma;

   info_ptr->gamma = (float)png_gamma;

#ifdef PNG_FIXED_POINT_SUPPORTED

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

#endif

   info_ptr->valid |= PNG_INFO_gAMA;

   if (png_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 png_gamma;

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

      png_gamma=PNG_UINT_31_MAX;

   }

   else

   {

      if (int_gamma < 0)

      {

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

         png_gamma = 0;

      }

      else

         png_gamma = int_gamma;

   }

#ifdef PNG_FLOATING_POINT_SUPPORTED

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

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

   info_ptr->int_gamma = png_gamma;

#endif

   info_ptr->valid |= PNG_INFO_gAMA;

   if (png_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", "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", "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", "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", "pCAL");

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

      return;

   length = png_strlen(purpose) + 1;

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

     (unsigned long)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");

   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, (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;

   }

   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], (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", "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", "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 (%u bytes)",

      (unsigned int)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.");

      return;

   }

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

   length = png_strlen(sheight) + 1;

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

      (unsigned int)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);

      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, (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", "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", "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;