Imported Upstream version 1.8.3upstream/1.8.3

1 files changed, 0 insertions, 1597 deletions

diff --git a/png/pngset.c b/png/pngset.c
deleted file mode 100755
index 0c827d3..0000000
--- a/png/pngset.c
+++ /dev/null
@@ -1,1597 +0,0 @@
-
-/* pngset.c - storage of image information into info struct
- *
- * Last changed in libpng 1.6.11 [June 12, 2014]
- * Copyright (c) 1998-2014 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * The functions here are used during reads to store data from the file
- * into the info struct, and during writes to store application data
- * into the info struct for writing into the file.  This abstracts the
- * info struct and allows us to change the structure in the future.
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-
-#ifdef PNG_bKGD_SUPPORTED
-void PNGAPI
-png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_color_16p background)
-{
-   png_debug1(1, "in %s storage function", "bKGD");
-
-   if (png_ptr == NULL || info_ptr == NULL || background == NULL)
-      return;
-
-   info_ptr->background = *background;
-   info_ptr->valid |= PNG_INFO_bKGD;
-}
-#endif
-
-#ifdef PNG_cHRM_SUPPORTED
-void PNGFAPI
-png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp 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_xy xy;
-
-   png_debug1(1, "in %s storage function", "cHRM fixed");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   xy.redx = red_x;
-   xy.redy = red_y;
-   xy.greenx = green_x;
-   xy.greeny = green_y;
-   xy.bluex = blue_x;
-   xy.bluey = blue_y;
-   xy.whitex = white_x;
-   xy.whitey = white_y;
-
-   if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
-      2/* override with app values*/))
-      info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
-
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-void PNGFAPI
-png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_fixed_point int_red_X, png_fixed_point int_red_Y,
-    png_fixed_point int_red_Z, png_fixed_point int_green_X,
-    png_fixed_point int_green_Y, png_fixed_point int_green_Z,
-    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
-    png_fixed_point int_blue_Z)
-{
-   png_XYZ XYZ;
-
-   png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   XYZ.red_X = int_red_X;
-   XYZ.red_Y = int_red_Y;
-   XYZ.red_Z = int_red_Z;
-   XYZ.green_X = int_green_X;
-   XYZ.green_Y = int_green_Y;
-   XYZ.green_Z = int_green_Z;
-   XYZ.blue_X = int_blue_X;
-   XYZ.blue_Y = int_blue_Y;
-   XYZ.blue_Z = int_blue_Z;
-
-   if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2))
-      info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
-
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
-    double white_x, double white_y, double red_x, double red_y,
-    double green_x, double green_y, double blue_x, double blue_y)
-{
-   png_set_cHRM_fixed(png_ptr, info_ptr,
-      png_fixed(png_ptr, white_x, "cHRM White X"),
-      png_fixed(png_ptr, white_y, "cHRM White Y"),
-      png_fixed(png_ptr, red_x, "cHRM Red X"),
-      png_fixed(png_ptr, red_y, "cHRM Red Y"),
-      png_fixed(png_ptr, green_x, "cHRM Green X"),
-      png_fixed(png_ptr, green_y, "cHRM Green Y"),
-      png_fixed(png_ptr, blue_x, "cHRM Blue X"),
-      png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
-}
-
-void PNGAPI
-png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
-    double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
-    double blue_X, double blue_Y, double blue_Z)
-{
-   png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
-      png_fixed(png_ptr, red_X, "cHRM Red X"),
-      png_fixed(png_ptr, red_Y, "cHRM Red Y"),
-      png_fixed(png_ptr, red_Z, "cHRM Red Z"),
-      png_fixed(png_ptr, green_X, "cHRM Red X"),
-      png_fixed(png_ptr, green_Y, "cHRM Red Y"),
-      png_fixed(png_ptr, green_Z, "cHRM Red Z"),
-      png_fixed(png_ptr, blue_X, "cHRM Red X"),
-      png_fixed(png_ptr, blue_Y, "cHRM Red Y"),
-      png_fixed(png_ptr, blue_Z, "cHRM Red Z"));
-}
-#  endif /* PNG_FLOATING_POINT_SUPPORTED */
-
-#endif /* PNG_cHRM_SUPPORTED */
-
-#ifdef PNG_gAMA_SUPPORTED
-void PNGFAPI
-png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_fixed_point file_gamma)
-{
-   png_debug1(1, "in %s storage function", "gAMA");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
-{
-   png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
-       "png_set_gAMA"));
-}
-#  endif
-#endif
-
-#ifdef PNG_hIST_SUPPORTED
-void PNGAPI
-png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_uint_16p hist)
-{
-   int i;
-
-   png_debug1(1, "in %s storage function", "hIST");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (info_ptr->num_palette == 0 || info_ptr->num_palette
-       > PNG_MAX_PALETTE_LENGTH)
-   {
-      png_warning(png_ptr,
-          "Invalid palette size, hIST allocation skipped");
-
-      return;
-   }
-
-   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
-
-   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
-    * version 1.2.1
-    */
-   info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
-       PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
-
-   if (info_ptr->hist == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for hIST chunk data");
-      return;
-   }
-
-   info_ptr->free_me |= PNG_FREE_HIST;
-
-   for (i = 0; i < info_ptr->num_palette; i++)
-      info_ptr->hist[i] = hist[i];
-
-   info_ptr->valid |= PNG_INFO_hIST;
-}
-#endif
-
-void PNGAPI
-png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_uint_32 width, png_uint_32 height, int bit_depth,
-    int color_type, int interlace_type, int compression_type,
-    int filter_type)
-{
-   png_debug1(1, "in %s storage function", "IHDR");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   info_ptr->width = width;
-   info_ptr->height = height;
-   info_ptr->bit_depth = (png_byte)bit_depth;
-   info_ptr->color_type = (png_byte)color_type;
-   info_ptr->compression_type = (png_byte)compression_type;
-   info_ptr->filter_type = (png_byte)filter_type;
-   info_ptr->interlace_type = (png_byte)interlace_type;
-
-   png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
-       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
-       info_ptr->compression_type, info_ptr->filter_type);
-
-   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      info_ptr->channels = 1;
-
-   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
-      info_ptr->channels = 3;
-
-   else
-      info_ptr->channels = 1;
-
-   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
-      info_ptr->channels++;
-
-   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
-
-   info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
-}
-
-#ifdef PNG_oFFs_SUPPORTED
-void PNGAPI
-png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_int_32 offset_x, png_int_32 offset_y, int unit_type)
-{
-   png_debug1(1, "in %s storage function", "oFFs");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   info_ptr->x_offset = offset_x;
-   info_ptr->y_offset = offset_y;
-   info_ptr->offset_unit_type = (png_byte)unit_type;
-   info_ptr->valid |= PNG_INFO_oFFs;
-}
-#endif
-
-#ifdef PNG_pCAL_SUPPORTED
-void PNGAPI
-png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
-    int nparams, png_const_charp units, png_charpp params)
-{
-   png_size_t length;
-   int i;
-
-   png_debug1(1, "in %s storage function", "pCAL");
-
-   if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
-      || (nparams > 0 && params == NULL))
-      return;
-
-   length = strlen(purpose) + 1;
-   png_debug1(3, "allocating purpose for info (%lu bytes)",
-       (unsigned long)length);
-
-   /* TODO: validate format of calibration name and unit name */
-
-   /* Check that the type matches the specification. */
-   if (type < 0 || type > 3)
-      png_error(png_ptr, "Invalid pCAL equation type");
-
-   if (nparams < 0 || nparams > 255)
-      png_error(png_ptr, "Invalid pCAL parameter count");
-
-   /* Validate params[nparams] */
-   for (i=0; i<nparams; ++i)
-      if (params[i] == NULL ||
-         !png_check_fp_string(params[i], strlen(params[i])))
-         png_error(png_ptr, "Invalid format for pCAL parameter");
-
-   info_ptr->pcal_purpose = png_voidcast(png_charp,
-      png_malloc_warn(png_ptr, length));
-
-   if (info_ptr->pcal_purpose == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for pCAL purpose");
-      return;
-   }
-
-   memcpy(info_ptr->pcal_purpose, purpose, length);
-
-   png_debug(3, "storing X0, X1, type, and nparams in info");
-   info_ptr->pcal_X0 = X0;
-   info_ptr->pcal_X1 = X1;
-   info_ptr->pcal_type = (png_byte)type;
-   info_ptr->pcal_nparams = (png_byte)nparams;
-
-   length = strlen(units) + 1;
-   png_debug1(3, "allocating units for info (%lu bytes)",
-     (unsigned long)length);
-
-   info_ptr->pcal_units = png_voidcast(png_charp,
-      png_malloc_warn(png_ptr, length));
-
-   if (info_ptr->pcal_units == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for pCAL units");
-      return;
-   }
-
-   memcpy(info_ptr->pcal_units, units, length);
-
-   info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
-       (png_size_t)((nparams + 1) * (sizeof (png_charp)))));
-
-   if (info_ptr->pcal_params == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for pCAL params");
-      return;
-   }
-
-   memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
-
-   for (i = 0; i < nparams; i++)
-   {
-      length = 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;
-      }
-
-      memcpy(info_ptr->pcal_params[i], params[i], length);
-   }
-
-   info_ptr->valid |= PNG_INFO_pCAL;
-   info_ptr->free_me |= PNG_FREE_PCAL;
-}
-#endif
-
-#ifdef PNG_sCAL_SUPPORTED
-void PNGAPI
-png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
-    int unit, png_const_charp swidth, png_const_charp sheight)
-{
-   png_size_t lengthw = 0, lengthh = 0;
-
-   png_debug1(1, "in %s storage function", "sCAL");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   /* Double check the unit (should never get here with an invalid
-    * unit unless this is an API call.)
-    */
-   if (unit != 1 && unit != 2)
-      png_error(png_ptr, "Invalid sCAL unit");
-
-   if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
-       swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
-      png_error(png_ptr, "Invalid sCAL width");
-
-   if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
-       sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
-      png_error(png_ptr, "Invalid sCAL height");
-
-   info_ptr->scal_unit = (png_byte)unit;
-
-   ++lengthw;
-
-   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
-
-   info_ptr->scal_s_width = png_voidcast(png_charp,
-      png_malloc_warn(png_ptr, lengthw));
-
-   if (info_ptr->scal_s_width == NULL)
-   {
-      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
-      return;
-   }
-
-   memcpy(info_ptr->scal_s_width, swidth, lengthw);
-
-   ++lengthh;
-
-   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
-
-   info_ptr->scal_s_height = png_voidcast(png_charp,
-      png_malloc_warn(png_ptr, lengthh));
-
-   if (info_ptr->scal_s_height == NULL)
-   {
-      png_free (png_ptr, info_ptr->scal_s_width);
-      info_ptr->scal_s_width = NULL;
-
-      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
-      return;
-   }
-
-   memcpy(info_ptr->scal_s_height, sheight, lengthh);
-
-   info_ptr->valid |= PNG_INFO_sCAL;
-   info_ptr->free_me |= PNG_FREE_SCAL;
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
-    double width, double height)
-{
-   png_debug1(1, "in %s storage function", "sCAL");
-
-   /* Check the arguments. */
-   if (width <= 0)
-      png_warning(png_ptr, "Invalid sCAL width ignored");
-
-   else if (height <= 0)
-      png_warning(png_ptr, "Invalid sCAL height ignored");
-
-   else
-   {
-      /* Convert 'width' and 'height' to ASCII. */
-      char swidth[PNG_sCAL_MAX_DIGITS+1];
-      char sheight[PNG_sCAL_MAX_DIGITS+1];
-
-      png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
-         PNG_sCAL_PRECISION);
-      png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
-         PNG_sCAL_PRECISION);
-
-      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
-   }
-}
-#  endif
-
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-void PNGAPI
-png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
-    png_fixed_point width, png_fixed_point height)
-{
-   png_debug1(1, "in %s storage function", "sCAL");
-
-   /* Check the arguments. */
-   if (width <= 0)
-      png_warning(png_ptr, "Invalid sCAL width ignored");
-
-   else if (height <= 0)
-      png_warning(png_ptr, "Invalid sCAL height ignored");
-
-   else
-   {
-      /* Convert 'width' and 'height' to ASCII. */
-      char swidth[PNG_sCAL_MAX_DIGITS+1];
-      char sheight[PNG_sCAL_MAX_DIGITS+1];
-
-      png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
-      png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
-
-      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
-   }
-}
-#  endif
-#endif
-
-#ifdef PNG_pHYs_SUPPORTED
-void PNGAPI
-png_set_pHYs(png_const_structrp png_ptr, png_inforp 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_structrp png_ptr, png_inforp info_ptr,
-    png_const_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;
-      }
-   }
-
-   if ((num_palette > 0 && palette == NULL) ||
-      (num_palette == 0
-#        ifdef PNG_MNG_FEATURES_SUPPORTED
-            && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
-#        endif
-      ))
-   {
-      png_error(png_ptr, "Invalid palette");
-      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.
-    *
-    * 1.6.0: the above statement appears to be incorrect; something has to set
-    * the palette inside png_struct on read.
-    */
-   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
-
-   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
-    * of num_palette entries, in case of an invalid PNG file that has
-    * too-large sample values.
-    */
-   png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
-       PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
-
-   if (num_palette > 0)
-      memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
-   info_ptr->palette = png_ptr->palette;
-   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
-
-   info_ptr->free_me |= PNG_FREE_PLTE;
-
-   info_ptr->valid |= PNG_INFO_PLTE;
-}
-
-#ifdef PNG_sBIT_SUPPORTED
-void PNGAPI
-png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_color_8p sig_bit)
-{
-   png_debug1(1, "in %s storage function", "sBIT");
-
-   if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
-      return;
-
-   info_ptr->sig_bit = *sig_bit;
-   info_ptr->valid |= PNG_INFO_sBIT;
-}
-#endif
-
-#ifdef PNG_sRGB_SUPPORTED
-void PNGAPI
-png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
-{
-   png_debug1(1, "in %s storage function", "sRGB");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-void PNGAPI
-png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
-    int srgb_intent)
-{
-   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent))
-   {
-      /* This causes the gAMA and cHRM to be written too */
-      info_ptr->colorspace.flags |=
-         PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
-   }
-
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-#endif /* sRGB */
-
-
-#ifdef PNG_iCCP_SUPPORTED
-void PNGAPI
-png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_charp name, int compression_type,
-    png_const_bytep profile, png_uint_32 proflen)
-{
-   png_charp new_iccp_name;
-   png_bytep new_iccp_profile;
-   png_size_t length;
-
-   png_debug1(1, "in %s storage function", "iCCP");
-
-   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
-      return;
-
-   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
-      png_app_error(png_ptr, "Invalid iCCP compression method");
-
-   /* Set the colorspace first because this validates the profile; do not
-    * override previously set app cHRM or gAMA here (because likely as not the
-    * application knows better than libpng what the correct values are.)  Pass
-    * the info_ptr color_type field to png_colorspace_set_ICC because in the
-    * write case it has not yet been stored in png_ptr.
-    */
-   {
-      int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
-         proflen, profile, info_ptr->color_type);
-
-      png_colorspace_sync_info(png_ptr, info_ptr);
-
-      /* Don't do any of the copying if the profile was bad, or inconsistent. */
-      if (result == 0)
-         return;
-
-      /* But do write the gAMA and cHRM chunks from the profile. */
-      info_ptr->colorspace.flags |=
-         PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
-   }
-
-   length = strlen(name)+1;
-   new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
-
-   if (new_iccp_name == NULL)
-   {
-      png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
-      return;
-   }
-
-   memcpy(new_iccp_name, name, length);
-   new_iccp_profile = png_voidcast(png_bytep,
-      png_malloc_warn(png_ptr, proflen));
-
-   if (new_iccp_profile == NULL)
-   {
-      png_free(png_ptr, new_iccp_name);
-      png_benign_error(png_ptr,
-          "Insufficient memory to process iCCP profile");
-      return;
-   }
-
-   memcpy(new_iccp_profile, profile, 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;
-   info_ptr->free_me |= PNG_FREE_ICCP;
-   info_ptr->valid |= PNG_INFO_iCCP;
-}
-#endif
-
-#ifdef PNG_TEXT_SUPPORTED
-void PNGAPI
-png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_textp text_ptr, int num_text)
-{
-   int ret;
-   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
-
-   if (ret != 0)
-      png_error(png_ptr, "Insufficient memory to store text");
-}
-
-int /* PRIVATE */
-png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_textp text_ptr, int num_text)
-{
-   int i;
-
-   png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :
-      (unsigned long)png_ptr->chunk_name);
-
-   if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
-      return(0);
-
-   /* Make sure we have enough space in the "text" array in info_struct
-    * to hold all of the incoming text_ptr objects.  This compare can't overflow
-    * because max_text >= num_text (anyway, subtract of two positive integers
-    * can't overflow in any case.)
-    */
-   if (num_text > info_ptr->max_text - info_ptr->num_text)
-   {
-      int old_num_text = info_ptr->num_text;
-      int max_text;
-      png_textp new_text = NULL;
-
-      /* Calculate an appropriate max_text, checking for overflow. */
-      max_text = old_num_text;
-      if (num_text <= INT_MAX - max_text)
-      {
-         max_text += num_text;
-
-         /* Round up to a multiple of 8 */
-         if (max_text < INT_MAX-8)
-            max_text = (max_text + 8) & ~0x7;
-
-         else
-            max_text = INT_MAX;
-
-         /* Now allocate a new array and copy the old members in, this does all
-          * the overflow checks.
-          */
-         new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
-            info_ptr->text, old_num_text, max_text-old_num_text,
-            sizeof *new_text));
-      }
-
-      if (new_text == NULL)
-      {
-         png_chunk_report(png_ptr, "too many text chunks",
-            PNG_CHUNK_WRITE_ERROR);
-         return 1;
-      }
-
-      png_free(png_ptr, info_ptr->text);
-
-      info_ptr->text = new_text;
-      info_ptr->free_me |= PNG_FREE_TEXT;
-      info_ptr->max_text = max_text;
-      /* num_text is adjusted below as the entries are copied in */
-
-      png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
-   }
-
-   for (i = 0; i < num_text; i++)
-   {
-      size_t text_length, key_len;
-      size_t lang_len, lang_key_len;
-      png_textp textp = &(info_ptr->text[info_ptr->num_text]);
-
-      if (text_ptr[i].key == NULL)
-          continue;
-
-      if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
-          text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
-      {
-         png_chunk_report(png_ptr, "text compression mode is out of range",
-            PNG_CHUNK_WRITE_ERROR);
-         continue;
-      }
-
-      key_len = 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 = strlen(text_ptr[i].lang);
-
-         else
-            lang_len = 0;
-
-         if (text_ptr[i].lang_key != NULL)
-            lang_key_len = strlen(text_ptr[i].lang_key);
-
-         else
-            lang_key_len = 0;
-      }
-#  else /* PNG_iTXt_SUPPORTED */
-      {
-         png_chunk_report(png_ptr, "iTXt chunk not supported",
-            PNG_CHUNK_WRITE_ERROR);
-         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 = strlen(text_ptr[i].text);
-         textp->compression = text_ptr[i].compression;
-      }
-
-      textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
-          key_len + text_length + lang_len + lang_key_len + 4));
-
-      if (textp->key == NULL)
-      {
-         png_chunk_report(png_ptr, "text chunk: out of memory",
-               PNG_CHUNK_WRITE_ERROR);
-         return 1;
-      }
-
-      png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
-          (unsigned long)(png_uint_32)
-          (key_len + lang_len + lang_key_len + text_length + 4),
-          textp->key);
-
-      memcpy(textp->key, text_ptr[i].key, key_len);
-      *(textp->key + key_len) = '\0';
-
-      if (text_ptr[i].compression > 0)
-      {
-         textp->lang = textp->key + key_len + 1;
-         memcpy(textp->lang, text_ptr[i].lang, lang_len);
-         *(textp->lang + lang_len) = '\0';
-         textp->lang_key = textp->lang + lang_len + 1;
-         memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
-         *(textp->lang_key + lang_key_len) = '\0';
-         textp->text = textp->lang_key + lang_key_len + 1;
-      }
-
-      else
-      {
-         textp->lang=NULL;
-         textp->lang_key=NULL;
-         textp->text = textp->key + key_len + 1;
-      }
-
-      if (text_length != 0)
-         memcpy(textp->text, text_ptr[i].text, text_length);
-
-      *(textp->text + text_length) = '\0';
-
-#  ifdef PNG_iTXt_SUPPORTED
-      if (textp->compression > 0)
-      {
-         textp->text_length = 0;
-         textp->itxt_length = text_length;
-      }
-
-      else
-#  endif
-      {
-         textp->text_length = text_length;
-         textp->itxt_length = 0;
-      }
-
-      info_ptr->num_text++;
-      png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
-   }
-
-   return(0);
-}
-#endif
-
-#ifdef PNG_tIME_SUPPORTED
-void PNGAPI
-png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_timep mod_time)
-{
-   png_debug1(1, "in %s storage function", "tIME");
-
-   if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
-       (png_ptr->mode & PNG_WROTE_tIME))
-      return;
-
-   if (mod_time->month == 0   || mod_time->month > 12  ||
-       mod_time->day   == 0   || mod_time->day   > 31  ||
-       mod_time->hour  > 23   || mod_time->minute > 59 ||
-       mod_time->second > 60)
-   {
-      png_warning(png_ptr, "Ignoring invalid time value");
-      return;
-   }
-
-   info_ptr->mod_time = *mod_time;
-   info_ptr->valid |= PNG_INFO_tIME;
-}
-#endif
-
-#ifdef PNG_tRNS_SUPPORTED
-void PNGAPI
-png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
-    png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
-{
-   png_debug1(1, "in %s storage function", "tRNS");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (trans_alpha != NULL)
-   {
-       /* It may not actually be necessary to set png_ptr->trans_alpha here;
-        * we do it for backward compatibility with the way the png_handle_tRNS
-        * function used to do the allocation.
-        *
-        * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
-        * relies on png_set_tRNS storing the information in png_struct
-        * (otherwise it won't be there for the code in pngrtran.c).
-        */
-
-       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
-
-       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
-       png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
-         png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
-
-       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
-          memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
-   }
-
-   if (trans_color != NULL)
-   {
-      int sample_max = (1 << info_ptr->bit_depth);
-
-      if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
-          trans_color->gray > sample_max) ||
-          (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
-          (trans_color->red > sample_max ||
-          trans_color->green > sample_max ||
-          trans_color->blue > sample_max)))
-         png_warning(png_ptr,
-            "tRNS chunk has out-of-range samples for bit_depth");
-
-      info_ptr->trans_color = *trans_color;
-
-      if (num_trans == 0)
-         num_trans = 1;
-   }
-
-   info_ptr->num_trans = (png_uint_16)num_trans;
-
-   if (num_trans != 0)
-   {
-      info_ptr->valid |= PNG_INFO_tRNS;
-      info_ptr->free_me |= PNG_FREE_TRNS;
-   }
-}
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-void PNGAPI
-png_set_sPLT(png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
-/*
- *  entries        - array of png_sPLT_t structures
- *                   to be added to the list of palettes
- *                   in the info structure.
- *
- *  nentries       - number of palette structures to be
- *                   added.
- */
-{
-   png_sPLT_tp np;
-
-   if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
-      return;
-
-   /* Use the internal realloc function, which checks for all the possible
-    * overflows.  Notice that the parameters are (int) and (size_t)
-    */
-   np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
-      info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
-      sizeof *np));
-
-   if (np == NULL)
-   {
-      /* Out of memory or too many chunks */
-      png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
-      return;
-   }
-
-   png_free(png_ptr, info_ptr->splt_palettes);
-   info_ptr->splt_palettes = np;
-   info_ptr->free_me |= PNG_FREE_SPLT;
-
-   np += info_ptr->splt_palettes_num;
-
-   do
-   {
-      png_size_t length;
-
-      /* Skip invalid input entries */
-      if (entries->name == NULL || entries->entries == NULL)
-      {
-         /* png_handle_sPLT doesn't do this, so this is an app error */
-         png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
-         /* Just skip the invalid entry */
-         continue;
-      }
-
-      np->depth = entries->depth;
-
-      /* In the even of out-of-memory just return - there's no point keeping on
-       * trying to add sPLT chunks.
-       */
-      length = strlen(entries->name) + 1;
-      np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
-
-      if (np->name == NULL)
-         break;
-
-      memcpy(np->name, entries->name, length);
-
-      /* IMPORTANT: we have memory now that won't get freed if something else
-       * goes wrong, this code must free it.  png_malloc_array produces no
-       * warnings, use a png_chunk_report (below) if there is an error.
-       */
-      np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
-          entries->nentries, sizeof (png_sPLT_entry)));
-
-      if (np->entries == NULL)
-      {
-         png_free(png_ptr, np->name);
-         break;
-      }
-
-      np->nentries = entries->nentries;
-      /* This multiply can't overflow because png_malloc_array has already
-       * checked it when doing the allocation.
-       */
-      memcpy(np->entries, entries->entries,
-         entries->nentries * sizeof (png_sPLT_entry));
-
-      /* Note that 'continue' skips the advance of the out pointer and out
-       * count, so an invalid entry is not added.
-       */
-      info_ptr->valid |= PNG_INFO_sPLT;
-      ++(info_ptr->splt_palettes_num);
-      ++np;
-   }
-   while (++entries, --nentries);
-
-   if (nentries > 0)
-      png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
-}
-#endif /* PNG_sPLT_SUPPORTED */
-
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-static png_byte
-check_location(png_const_structrp png_ptr, int location)
-{
-   location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
-
-   /* New in 1.6.0; copy the location and check it.  This is an API
-    * change, previously the app had to use the
-    * png_set_unknown_chunk_location API below for each chunk.
-    */
-   if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT))
-   {
-      /* Write struct, so unknown chunks come from the app */
-      png_app_warning(png_ptr,
-         "png_set_unknown_chunks now expects a valid location");
-      /* Use the old behavior */
-      location = (png_byte)(png_ptr->mode &
-         (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
-   }
-
-   /* This need not be an internal error - if the app calls
-    * png_set_unknown_chunks on a read pointer it must get the location right.
-    */
-   if (location == 0)
-      png_error(png_ptr, "invalid location in png_set_unknown_chunks");
-
-   /* Now reduce the location to the top-most set bit by removing each least
-    * significant bit in turn.
-    */
-   while (location != (location & -location))
-      location &= ~(location & -location);
-
-   /* The cast is safe because 'location' is a bit mask and only the low four
-    * bits are significant.
-    */
-   return (png_byte)location;
-}
-
-void PNGAPI
-png_set_unknown_chunks(png_const_structrp png_ptr,
-   png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
-{
-   png_unknown_chunkp np;
-
-   if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
-      unknowns == NULL)
-      return;
-
-   /* Check for the failure cases where support has been disabled at compile
-    * time.  This code is hardly ever compiled - it's here because
-    * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
-    * code) but may be meaningless if the read or write handling of unknown
-    * chunks is not compiled in.
-    */
-#  if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
-      defined(PNG_READ_SUPPORTED)
-      if (png_ptr->mode & PNG_IS_READ_STRUCT)
-      {
-         png_app_error(png_ptr, "no unknown chunk support on read");
-         return;
-      }
-#  endif
-#  if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
-      defined(PNG_WRITE_SUPPORTED)
-      if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
-      {
-         png_app_error(png_ptr, "no unknown chunk support on write");
-         return;
-      }
-#  endif
-
-   /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
-    * unknown critical chunks could be lost with just a warning resulting in
-    * undefined behavior.  Now png_chunk_report is used to provide behavior
-    * appropriate to read or write.
-    */
-   np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
-         info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
-         sizeof *np));
-
-   if (np == NULL)
-   {
-      png_chunk_report(png_ptr, "too many unknown chunks",
-         PNG_CHUNK_WRITE_ERROR);
-      return;
-   }
-
-   png_free(png_ptr, info_ptr->unknown_chunks);
-   info_ptr->unknown_chunks = np; /* safe because it is initialized */
-   info_ptr->free_me |= PNG_FREE_UNKN;
-
-   np += info_ptr->unknown_chunks_num;
-
-   /* Increment unknown_chunks_num each time round the loop to protect the
-    * just-allocated chunk data.
-    */
-   for (; num_unknowns > 0; --num_unknowns, ++unknowns)
-   {
-      memcpy(np->name, unknowns->name, (sizeof np->name));
-      np->name[(sizeof np->name)-1] = '\0';
-      np->location = check_location(png_ptr, unknowns->location);
-
-      if (unknowns->size == 0)
-      {
-         np->data = NULL;
-         np->size = 0;
-      }
-
-      else
-      {
-         np->data = png_voidcast(png_bytep,
-            png_malloc_base(png_ptr, unknowns->size));
-
-         if (np->data == NULL)
-         {
-            png_chunk_report(png_ptr, "unknown chunk: out of memory",
-               PNG_CHUNK_WRITE_ERROR);
-            /* But just skip storing the unknown chunk */
-            continue;
-         }
-
-         memcpy(np->data, unknowns->data, unknowns->size);
-         np->size = unknowns->size;
-      }
-
-      /* These increments are skipped on out-of-memory for the data - the
-       * unknown chunk entry gets overwritten if the png_chunk_report returns.
-       * This is correct in the read case (the chunk is just dropped.)
-       */
-      ++np;
-      ++(info_ptr->unknown_chunks_num);
-   }
-}
-
-void PNGAPI
-png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
-    int chunk, int location)
-{
-   /* This API is pretty pointless in 1.6.0 because the location can be set
-    * before the call to png_set_unknown_chunks.
-    *
-    * TODO: add a png_app_warning in 1.7
-    */
-   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
-      chunk < info_ptr->unknown_chunks_num)
-   {
-      if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
-      {
-         png_app_error(png_ptr, "invalid unknown chunk location");
-         /* Fake out the pre 1.6.0 behavior: */
-         if ((location & PNG_HAVE_IDAT)) /* undocumented! */
-            location = PNG_AFTER_IDAT;
-
-         else
-            location = PNG_HAVE_IHDR; /* also undocumented */
-      }
-
-      info_ptr->unknown_chunks[chunk].location =
-         check_location(png_ptr, location);
-   }
-}
-#endif
-
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-png_uint_32 PNGAPI
-png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
-{
-   png_debug(1, "in png_permit_mng_features");
-
-   if (png_ptr == NULL)
-      return 0;
-
-   png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
-
-   return png_ptr->mng_features_permitted;
-}
-#endif
-
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-static unsigned int
-add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
-{
-   unsigned int i;
-
-   /* Utility function: update the 'keep' state of a chunk if it is already in
-    * the list, otherwise add it to the list.
-    */
-   for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0)
-   {
-      list[4] = (png_byte)keep;
-      return count;
-   }
-
-   if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
-   {
-      ++count;
-      memcpy(list, add, 4);
-      list[4] = (png_byte)keep;
-   }
-
-   return count;
-}
-
-void PNGAPI
-png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
-    png_const_bytep chunk_list, int num_chunks_in)
-{
-   png_bytep new_list;
-   unsigned int num_chunks, old_num_chunks;
-
-   if (png_ptr == NULL)
-      return;
-
-   if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
-   {
-      png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
-      return;
-   }
-
-   if (num_chunks_in <= 0)
-   {
-      png_ptr->unknown_default = keep;
-
-      /* '0' means just set the flags, so stop here */
-      if (num_chunks_in == 0)
-        return;
-   }
-
-   if (num_chunks_in < 0)
-   {
-      /* Ignore all unknown chunks and all chunks recognized by
-       * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
-       */
-      static PNG_CONST png_byte chunks_to_ignore[] = {
-         98,  75,  71,  68, '\0',  /* bKGD */
-         99,  72,  82,  77, '\0',  /* cHRM */
-        103,  65,  77,  65, '\0',  /* gAMA */
-        104,  73,  83,  84, '\0',  /* hIST */
-        105,  67,  67,  80, '\0',  /* iCCP */
-        105,  84,  88, 116, '\0',  /* iTXt */
-        111,  70,  70, 115, '\0',  /* oFFs */
-        112,  67,  65,  76, '\0',  /* pCAL */
-        112,  72,  89, 115, '\0',  /* pHYs */
-        115,  66,  73,  84, '\0',  /* sBIT */
-        115,  67,  65,  76, '\0',  /* sCAL */
-        115,  80,  76,  84, '\0',  /* sPLT */
-        115,  84,  69,  82, '\0',  /* sTER */
-        115,  82,  71,  66, '\0',  /* sRGB */
-        116,  69,  88, 116, '\0',  /* tEXt */
-        116,  73,  77,  69, '\0',  /* tIME */
-        122,  84,  88, 116, '\0'   /* zTXt */
-      };
-
-      chunk_list = chunks_to_ignore;
-      num_chunks = (sizeof chunks_to_ignore)/5;
-   }
-
-   else /* num_chunks_in > 0 */
-   {
-      if (chunk_list == NULL)
-      {
-         /* Prior to 1.6.0 this was silently ignored, now it is an app_error
-          * which can be switched off.
-          */
-         png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
-         return;
-      }
-
-      num_chunks = num_chunks_in;
-   }
-
-   old_num_chunks = png_ptr->num_chunk_list;
-   if (png_ptr->chunk_list == NULL)
-      old_num_chunks = 0;
-
-   /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
-    */
-   if (num_chunks + old_num_chunks > UINT_MAX/5)
-   {
-      png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
-      return;
-   }
-
-   /* If these chunks are being reset to the default then no more memory is
-    * required because add_one_chunk above doesn't extend the list if the 'keep'
-    * parameter is the default.
-    */
-   if (keep != 0)
-   {
-      new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
-          5 * (num_chunks + old_num_chunks)));
-
-      if (old_num_chunks > 0)
-         memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
-   }
-
-   else if (old_num_chunks > 0)
-      new_list = png_ptr->chunk_list;
-
-   else
-      new_list = NULL;
-
-   /* Add the new chunks together with each one's handling code.  If the chunk
-    * already exists the code is updated, otherwise the chunk is added to the
-    * end.  (In libpng 1.6.0 order no longer matters because this code enforces
-    * the earlier convention that the last setting is the one that is used.)
-    */
-   if (new_list != NULL)
-   {
-      png_const_bytep inlist;
-      png_bytep outlist;
-      unsigned int i;
-
-      for (i=0; i<num_chunks; ++i)
-         old_num_chunks = add_one_chunk(new_list, old_num_chunks,
-            chunk_list+5*i, keep);
-
-      /* Now remove any spurious 'default' entries. */
-      num_chunks = 0;
-      for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
-         if (inlist[4])
-         {
-            if (outlist != inlist)
-               memcpy(outlist, inlist, 5);
-            outlist += 5;
-            ++num_chunks;
-         }
-
-      /* This means the application has removed all the specialized handling. */
-      if (num_chunks == 0)
-      {
-         if (png_ptr->chunk_list != new_list)
-            png_free(png_ptr, new_list);
-
-         new_list = NULL;
-      }
-   }
-
-   else
-      num_chunks = 0;
-
-   png_ptr->num_chunk_list = num_chunks;
-
-   if (png_ptr->chunk_list != new_list)
-   {
-      if (png_ptr->chunk_list != NULL)
-         png_free(png_ptr, png_ptr->chunk_list);
-
-      png_ptr->chunk_list = new_list;
-   }
-}
-#endif
-
-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-void PNGAPI
-png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
-    png_user_chunk_ptr read_user_chunk_fn)
-{
-   png_debug(1, "in png_set_read_user_chunk_fn");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
-   png_ptr->user_chunk_ptr = user_chunk_ptr;
-}
-#endif
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-void PNGAPI
-png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_bytepp row_pointers)
-{
-   png_debug1(1, "in %s storage function", "rows");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
-      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
-
-   info_ptr->row_pointers = row_pointers;
-
-   if (row_pointers != NULL)
-      info_ptr->valid |= PNG_INFO_IDAT;
-}
-#endif
-
-void PNGAPI
-png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
-{
-    if (png_ptr == NULL)
-       return;
-
-    if (size == 0 || size > PNG_UINT_31_MAX)
-       png_error(png_ptr, "invalid compression buffer size");
-
-#  ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-      if (png_ptr->mode & PNG_IS_READ_STRUCT)
-      {
-         png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
-         return;
-      }
-#  endif
-
-#  ifdef PNG_WRITE_SUPPORTED
-      if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
-      {
-         if (png_ptr->zowner != 0)
-         {
-            png_warning(png_ptr,
-              "Compression buffer size cannot be changed because it is in use");
-            return;
-         }
-
-         if (size > ZLIB_IO_MAX)
-         {
-            png_warning(png_ptr,
-               "Compression buffer size limited to system maximum");
-            size = ZLIB_IO_MAX; /* must fit */
-         }
-
-         else if (size < 6)
-         {
-            /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
-             * if this is permitted.
-             */
-            png_warning(png_ptr,
-               "Compression buffer size cannot be reduced below 6");
-            return;
-         }
-
-         if (png_ptr->zbuffer_size != size)
-         {
-            png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
-            png_ptr->zbuffer_size = (uInt)size;
-         }
-      }
-#  endif
-}
-
-void PNGAPI
-png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
-{
-   if (png_ptr && info_ptr)
-      info_ptr->valid &= ~mask;
-}
-
-
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-/* This function was added to libpng 1.2.6 */
-void PNGAPI
-png_set_user_limits (png_structrp 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;
-}
-
-/* This function was added to libpng 1.4.0 */
-void PNGAPI
-png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
-{
-    if (png_ptr != NULL)
-       png_ptr->user_chunk_cache_max = user_chunk_cache_max;
-}
-
-/* This function was added to libpng 1.4.1 */
-void PNGAPI
-png_set_chunk_malloc_max (png_structrp png_ptr,
-    png_alloc_size_t user_chunk_malloc_max)
-{
-   if (png_ptr != NULL)
-      png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
-}
-#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
-
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-void PNGAPI
-png_set_benign_errors(png_structrp png_ptr, int allowed)
-{
-   png_debug(1, "in png_set_benign_errors");
-
-   /* If allowed is 1, png_benign_error() is treated as a warning.
-    *
-    * If allowed is 0, png_benign_error() is treated as an error (which
-    * is the default behavior if png_set_benign_errors() is not called).
-    */
-
-   if (allowed != 0)
-      png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
-         PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
-
-   else
-      png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
-         PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
-}
-#endif /* PNG_BENIGN_ERRORS_SUPPORTED */
-
-#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   /* Whether to report invalid palette index; added at libng-1.5.10.
-    * It is possible for an indexed (color-type==3) PNG file to contain
-    * pixels with invalid (out-of-range) indexes if the PLTE chunk has
-    * fewer entries than the image's bit-depth would allow. We recover
-    * from this gracefully by filling any incomplete palette with zeroes
-    * (opaque black).  By default, when this occurs libpng will issue
-    * a benign error.  This API can be used to override that behavior.
-    */
-void PNGAPI
-png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
-{
-   png_debug(1, "in png_set_check_for_invalid_index");
-
-   if (allowed > 0)
-      png_ptr->num_palette_max = 0;
-
-   else
-      png_ptr->num_palette_max = -1;
-}
-#endif
-#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */