X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a626cc03053700ca5bdbf0243831bec528e6fc4d..6619c4af1b03055fc130d72077186867fbdd7340:/src/png/pngset.c

diff --git a/src/png/pngset.c b/src/png/pngset.c
index 320083638c..92db3890a8 100644
--- a/src/png/pngset.c
+++ b/src/png/pngset.c
@@ -1,11 +1,14 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.3 - January 14, 1999
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.7 [December 15, 2011]
+ * Copyright (c) 1998-2011 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
@@ -13,116 +16,261 @@
  * info struct and allows us to change the structure in the future.
  */
 
-#define PNG_INTERNAL
-#include "png.h"
+#include "pngpriv.h"
+
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
-void
-png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
+#ifdef PNG_bKGD_SUPPORTED
+void PNGAPI
+png_set_bKGD(png_structp png_ptr, png_infop info_ptr,
+    png_const_color_16p background)
 {
-   png_debug1(1, "in %s storage function\n", "bKGD");
+   png_debug1(1, "in %s storage function", "bKGD");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
+   png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
    info_ptr->valid |= PNG_INFO_bKGD;
 }
 #endif
 
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
-void
-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)
+#ifdef PNG_cHRM_SUPPORTED
+void PNGFAPI
+png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+    png_fixed_point blue_x, png_fixed_point blue_y)
 {
-   png_debug1(1, "in %s storage function\n", "cHRM");
+   png_debug1(1, "in %s storage function", "cHRM fixed");
+
    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;
-   info_ptr->valid |= PNG_INFO_cHRM;
+#  ifdef PNG_CHECK_cHRM_SUPPORTED
+   if (png_check_cHRM_fixed(png_ptr,
+       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
+#  endif
+   {
+      info_ptr->x_white = white_x;
+      info_ptr->y_white = white_y;
+      info_ptr->x_red   = red_x;
+      info_ptr->y_red   = red_y;
+      info_ptr->x_green = green_x;
+      info_ptr->y_green = green_y;
+      info_ptr->x_blue  = blue_x;
+      info_ptr->y_blue  = blue_y;
+      info_ptr->valid |= PNG_INFO_cHRM;
+   }
 }
-#endif
 
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
-void
-png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
+void PNGFAPI
+png_set_cHRM_XYZ_fixed(png_structp png_ptr, png_infop info_ptr,
+    png_fixed_point int_red_X, png_fixed_point int_red_Y,
+    png_fixed_point int_red_Z, png_fixed_point int_green_X,
+    png_fixed_point int_green_Y, png_fixed_point int_green_Z,
+    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
+    png_fixed_point int_blue_Z)
+{
+   png_XYZ XYZ;
+   png_xy xy;
+
+   png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   XYZ.redX = int_red_X;
+   XYZ.redY = int_red_Y;
+   XYZ.redZ = int_red_Z;
+   XYZ.greenX = int_green_X;
+   XYZ.greenY = int_green_Y;
+   XYZ.greenZ = int_green_Z;
+   XYZ.blueX = int_blue_X;
+   XYZ.blueY = int_blue_Y;
+   XYZ.blueZ = int_blue_Z;
+
+   if (png_xy_from_XYZ(&xy, XYZ))
+      png_error(png_ptr, "XYZ values out of representable range");
+
+   png_set_cHRM_fixed(png_ptr, info_ptr, xy.whitex, xy.whitey, xy.redx, xy.redy,
+      xy.greenx, xy.greeny, xy.bluex, xy.bluey);
+}
+
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
+    double white_x, double white_y, double red_x, double red_y,
+    double green_x, double green_y, double blue_x, double blue_y)
+{
+   png_set_cHRM_fixed(png_ptr, info_ptr,
+      png_fixed(png_ptr, white_x, "cHRM White X"),
+      png_fixed(png_ptr, white_y, "cHRM White Y"),
+      png_fixed(png_ptr, red_x, "cHRM Red X"),
+      png_fixed(png_ptr, red_y, "cHRM Red Y"),
+      png_fixed(png_ptr, green_x, "cHRM Green X"),
+      png_fixed(png_ptr, green_y, "cHRM Green Y"),
+      png_fixed(png_ptr, blue_x, "cHRM Blue X"),
+      png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
+}
+
+void PNGAPI
+png_set_cHRM_XYZ(png_structp png_ptr, png_infop info_ptr, double red_X,
+    double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
+    double blue_X, double blue_Y, double blue_Z)
+{
+   png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
+      png_fixed(png_ptr, red_X, "cHRM Red X"),
+      png_fixed(png_ptr, red_Y, "cHRM Red Y"),
+      png_fixed(png_ptr, red_Z, "cHRM Red Z"),
+      png_fixed(png_ptr, green_X, "cHRM 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_structp png_ptr, png_infop info_ptr, png_fixed_point
+    file_gamma)
 {
-   png_debug1(1, "in %s storage function\n", "gAMA");
+   png_debug1(1, "in %s storage function", "gAMA");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->gamma = (float)file_gamma;
-   info_ptr->valid |= PNG_INFO_gAMA;
+   /* Changed in libpng-1.5.4 to limit the values to ensure overflow can't
+    * occur.  Since the fixed point representation is assymetrical it is
+    * possible for 1/gamma to overflow the limit of 21474 and this means the
+    * gamma value must be at least 5/100000 and hence at most 20000.0.  For
+    * safety the limits here are a little narrower.  The values are 0.00016 to
+    * 6250.0, which are truly ridiculous gammma values (and will produce
+    * displays that are all black or all white.)
+    */
+   if (file_gamma < 16 || file_gamma > 625000000)
+      png_warning(png_ptr, "Out of range gamma value ignored");
+
+   else
+   {
+      info_ptr->gamma = file_gamma;
+      info_ptr->valid |= PNG_INFO_gAMA;
+   }
+}
+
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
+{
+   png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
+       "png_set_gAMA"));
 }
+#  endif
 #endif
 
-#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
-void
-png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
+#ifdef PNG_hIST_SUPPORTED
+void PNGAPI
+png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_const_uint_16p hist)
 {
-   png_debug1(1, "in %s storage function\n", "hIST");
+   int i;
+
+   png_debug1(1, "in %s storage function", "hIST");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->hist = hist;
+   if (info_ptr->num_palette == 0 || info_ptr->num_palette
+       > PNG_MAX_PALETTE_LENGTH)
+   {
+      png_warning(png_ptr,
+          "Invalid palette size, hIST allocation skipped");
+
+      return;
+   }
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
+
+   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
+    * version 1.2.1
+    */
+   png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
+       PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16));
+
+   if (png_ptr->hist == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for hIST chunk data");
+      return;
+   }
+
+   for (i = 0; i < info_ptr->num_palette; i++)
+      png_ptr->hist[i] = hist[i];
+
+   info_ptr->hist = png_ptr->hist;
    info_ptr->valid |= PNG_INFO_hIST;
+   info_ptr->free_me |= PNG_FREE_HIST;
 }
 #endif
 
-void
+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_uint_32 width, png_uint_32 height, int bit_depth,
+    int color_type, int interlace_type, int compression_type,
+    int filter_type)
 {
-   int rowbytes_per_pixel;
-   png_debug1(1, "in %s storage function\n", "IHDR");
+   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->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);
 
-   /* check for overflow */
-   rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
-   if (( width > (png_uint_32)2147483647L/rowbytes_per_pixel))
-   {
-      png_warning(png_ptr,
-         "Width too large to process image data; rowbytes will overflow.");
-      info_ptr->rowbytes = (png_size_t)0;
-   }
+   /* Check for potential overflow */
+   if (width >
+       (PNG_UINT_32_MAX >> 3)      /* 8-byte RRGGBBAA pixels */
+       - 48       /* bigrowbuf hack */
+       - 1        /* filter byte */
+       - 7*8      /* rounding of width to multiple of 8 pixels */
+       - 8)       /* extra max_pixel_depth pad */
+      info_ptr->rowbytes = 0;
    else
-      info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
+      info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
 }
 
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-void
+#ifdef PNG_oFFs_SUPPORTED
+void PNGAPI
 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)
+    png_int_32 offset_x, png_int_32 offset_y, int unit_type)
 {
-   png_debug1(1, "in %s storage function\n", "oFFs");
+   png_debug1(1, "in %s storage function", "oFFs");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -133,57 +281,227 @@ png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
-void
+#ifdef 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_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
+    int nparams, png_const_charp units, png_charpp params)
 {
-   png_uint_32 length;
+   png_size_t length;
    int i;
 
-   png_debug1(1, "in %s storage function\n", "pCAL");
+   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 (%d bytes)\n", length);
-   info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
+   png_debug1(3, "allocating purpose for info (%lu bytes)",
+       (unsigned long)length);
+
+   /* TODO: validate format of calibration name and unit name */
+
+   /* Check that the type matches the specification. */
+   if (type < 0 || type > 3)
+      png_error(png_ptr, "Invalid pCAL equation type");
+
+   /* Validate params[nparams] */
+   for (i=0; i<nparams; ++i)
+      if (!png_check_fp_string(params[i], png_strlen(params[i])))
+         png_error(png_ptr, "Invalid format for pCAL parameter");
+
+   info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
+
+   if (info_ptr->pcal_purpose == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for pCAL purpose");
+      return;
+   }
+
+   png_memcpy(info_ptr->pcal_purpose, purpose, length);
 
-   png_debug(3, "storing X0, X1, type, and nparams in info\n");
+   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 (%d bytes)\n", length);
-   info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
+   png_debug1(3, "allocating units for info (%lu bytes)",
+     (unsigned long)length);
 
-   info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
-      (png_uint_32)((nparams + 1) * sizeof(png_charp)));
-   info_ptr->pcal_params[nparams] = NULL;
+   info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
+
+   if (info_ptr->pcal_units == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for pCAL units");
+      return;
+   }
+
+   png_memcpy(info_ptr->pcal_units, units, length);
+
+   info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
+       (png_size_t)((nparams + 1) * png_sizeof(png_charp)));
+
+   if (info_ptr->pcal_params == NULL)
+   {
+      png_warning(png_ptr, "Insufficient memory for pCAL params");
+      return;
+   }
+
+   png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));
 
    for (i = 0; i < nparams; i++)
    {
       length = png_strlen(params[i]) + 1;
-      png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
-      info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
-      png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
+      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
+          (unsigned long)length);
+
+      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
+
+      if (info_ptr->pcal_params[i] == NULL)
+      {
+         png_warning(png_ptr, "Insufficient memory for pCAL parameter");
+         return;
+      }
+
+      png_memcpy(info_ptr->pcal_params[i], params[i], length);
    }
 
    info_ptr->valid |= PNG_INFO_pCAL;
+   info_ptr->free_me |= PNG_FREE_PCAL;
 }
 #endif
 
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-void
+#ifdef PNG_sCAL_SUPPORTED
+void PNGAPI
+png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+    int unit, png_const_charp swidth, png_const_charp sheight)
+{
+   png_size_t lengthw = 0, lengthh = 0;
+
+   png_debug1(1, "in %s storage function", "sCAL");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   /* Double check the unit (should never get here with an invalid
+    * unit unless this is an API call.)
+    */
+   if (unit != 1 && unit != 2)
+      png_error(png_ptr, "Invalid sCAL unit");
+
+   if (swidth == NULL || (lengthw = png_strlen(swidth)) == 0 ||
+       swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
+      png_error(png_ptr, "Invalid sCAL width");
+
+   if (sheight == NULL || (lengthh = png_strlen(sheight)) == 0 ||
+       sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
+      png_error(png_ptr, "Invalid sCAL height");
+
+   info_ptr->scal_unit = (png_byte)unit;
+
+   ++lengthw;
+
+   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
+
+   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, lengthw);
+
+   if (info_ptr->scal_s_width == NULL)
+   {
+      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
+      return;
+   }
+
+   png_memcpy(info_ptr->scal_s_width, swidth, lengthw);
+
+   ++lengthh;
+
+   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
+
+   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, lengthh);
+
+   if (info_ptr->scal_s_height == NULL)
+   {
+      png_free (png_ptr, info_ptr->scal_s_width);
+      info_ptr->scal_s_width = NULL;
+
+      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
+      return;
+   }
+
+   png_memcpy(info_ptr->scal_s_height, sheight, lengthh);
+
+   info_ptr->valid |= PNG_INFO_sCAL;
+   info_ptr->free_me |= PNG_FREE_SCAL;
+}
+
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL(png_structp png_ptr, png_infop info_ptr, int unit, double width,
+    double height)
+{
+   png_debug1(1, "in %s storage function", "sCAL");
+
+   /* Check the arguments. */
+   if (width <= 0)
+      png_warning(png_ptr, "Invalid sCAL width ignored");
+
+   else if (height <= 0)
+      png_warning(png_ptr, "Invalid sCAL height ignored");
+
+   else
+   {
+      /* Convert 'width' and 'height' to ASCII. */
+      char swidth[PNG_sCAL_MAX_DIGITS+1];
+      char sheight[PNG_sCAL_MAX_DIGITS+1];
+
+      png_ascii_from_fp(png_ptr, swidth, sizeof swidth, width,
+         PNG_sCAL_PRECISION);
+      png_ascii_from_fp(png_ptr, sheight, sizeof sheight, height,
+         PNG_sCAL_PRECISION);
+
+      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
+   }
+}
+#  endif
+
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL_fixed(png_structp png_ptr, png_infop info_ptr, int unit,
+    png_fixed_point width, png_fixed_point height)
+{
+   png_debug1(1, "in %s storage function", "sCAL");
+
+   /* Check the arguments. */
+   if (width <= 0)
+      png_warning(png_ptr, "Invalid sCAL width ignored");
+
+   else if (height <= 0)
+      png_warning(png_ptr, "Invalid sCAL height ignored");
+
+   else
+   {
+      /* Convert 'width' and 'height' to ASCII. */
+      char swidth[PNG_sCAL_MAX_DIGITS+1];
+      char sheight[PNG_sCAL_MAX_DIGITS+1];
+
+      png_ascii_from_fixed(png_ptr, swidth, sizeof swidth, width);
+      png_ascii_from_fixed(png_ptr, sheight, sizeof sheight, height);
+
+      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
+   }
+}
+#  endif
+#endif
+
+#ifdef PNG_pHYs_SUPPORTED
+void PNGAPI
 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 res_x, png_uint_32 res_y, int unit_type)
+    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
 {
-   png_debug1(1, "in %s storage function\n", "pHYs");
+   png_debug1(1, "in %s storage function", "pHYs");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -194,95 +512,180 @@ png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-void
+void PNGAPI
 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
-   png_colorp palette, int num_palette)
+    png_const_colorp palette, int num_palette)
 {
-   png_debug1(1, "in %s storage function\n", "PLTE");
+
+   png_debug1(1, "in %s storage function", "PLTE");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->palette = palette;
-   info_ptr->num_palette = (png_uint_16)num_palette;
+   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.
+    */
+   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_colorp)png_calloc(png_ptr,
+       PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
+
+   png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
+   info_ptr->palette = png_ptr->palette;
+   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
+
+   info_ptr->free_me |= PNG_FREE_PLTE;
+
    info_ptr->valid |= PNG_INFO_PLTE;
 }
 
-#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
-void
+#ifdef PNG_sBIT_SUPPORTED
+void PNGAPI
 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
-   png_color_8p sig_bit)
+    png_const_color_8p sig_bit)
 {
-   png_debug1(1, "in %s storage function\n", "sBIT");
+   png_debug1(1, "in %s storage function", "sBIT");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
+   png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8));
    info_ptr->valid |= PNG_INFO_sBIT;
 }
 #endif
 
-#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
-void
-png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
+#ifdef PNG_sRGB_SUPPORTED
+void PNGAPI
+png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int srgb_intent)
 {
-   png_debug1(1, "in %s storage function\n", "sRGB");
+   png_debug1(1, "in %s storage function", "sRGB");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->srgb_intent = (png_byte)intent;
+   info_ptr->srgb_intent = (png_byte)srgb_intent;
    info_ptr->valid |= PNG_INFO_sRGB;
 }
-void
+
+void PNGAPI
 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
-   int intent)
+    int srgb_intent)
 {
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
-   float file_gamma;
-#endif
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
-   float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
-#endif
-   png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
+   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   png_set_sRGB(png_ptr, info_ptr, intent);
+   png_set_sRGB(png_ptr, info_ptr, srgb_intent);
 
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
-   file_gamma = (float).45;
-   png_set_gAMA(png_ptr, info_ptr, file_gamma);
-#endif
+#  ifdef PNG_gAMA_SUPPORTED
+   png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE);
+#  endif
 
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_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;
+#  ifdef PNG_cHRM_SUPPORTED
+   png_set_cHRM_fixed(png_ptr, info_ptr,
+      /* color      x       y */
+      /* white */ 31270, 32900,
+      /* red   */ 64000, 33000,
+      /* green */ 30000, 60000,
+      /* blue  */ 15000,  6000
+   );
+#  endif /* cHRM */
+}
+#endif /* sRGB */
 
-   png_set_cHRM(png_ptr, info_ptr,
-      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
 
-#endif
+#ifdef PNG_iCCP_SUPPORTED
+void PNGAPI
+png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
+    png_const_charp name, int compression_type,
+    png_const_bytep profile, png_uint_32 proflen)
+{
+   png_charp new_iccp_name;
+   png_bytep new_iccp_profile;
+   png_size_t length;
+
+   png_debug1(1, "in %s storage function", "iCCP");
+
+   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
+      return;
+
+   length = png_strlen(name)+1;
+   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
+
+   if (new_iccp_name == NULL)
+   {
+        png_warning(png_ptr, "Insufficient memory to process iCCP chunk");
+      return;
+   }
+
+   png_memcpy(new_iccp_name, name, length);
+   new_iccp_profile = (png_bytep)png_malloc_warn(png_ptr, proflen);
+
+   if (new_iccp_profile == NULL)
+   {
+      png_free (png_ptr, new_iccp_name);
+      png_warning(png_ptr,
+          "Insufficient memory to process iCCP profile");
+      return;
+   }
+
+   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
+
+   info_ptr->iccp_proflen = proflen;
+   info_ptr->iccp_name = new_iccp_name;
+   info_ptr->iccp_profile = new_iccp_profile;
+   /* Compression is always zero but is here so the API and info structure
+    * does not have to change if we introduce multiple compression types
+    */
+   info_ptr->iccp_compression = (png_byte)compression_type;
+   info_ptr->free_me |= PNG_FREE_ICCP;
+   info_ptr->valid |= PNG_INFO_iCCP;
 }
 #endif
 
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
-void
-png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
-   int num_text)
+#ifdef PNG_TEXT_SUPPORTED
+void PNGAPI
+png_set_text(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr,
+    int num_text)
+{
+   int ret;
+   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
+
+   if (ret)
+      png_error(png_ptr, "Insufficient memory to store text");
+}
+
+int /* PRIVATE */
+png_set_text_2(png_structp png_ptr, png_infop info_ptr,
+    png_const_textp text_ptr, int num_text)
 {
    int i;
 
-   png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
-      "text" : (png_const_charp)png_ptr->chunk_name));
+   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)
-      return;
+      return(0);
 
    /* Make sure we have enough space in the "text" array in info_struct
     * to hold all of the incoming text_ptr objects.
@@ -297,84 +700,585 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          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(png_ptr,
-            (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
+            (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
+
+         if (info_ptr->text == NULL)
+         {
+            png_free(png_ptr, old_text);
+            return(1);
+         }
+
          png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
-            sizeof(png_text)));
+             png_sizeof(png_text)));
          png_free(png_ptr, old_text);
       }
+
       else
       {
          info_ptr->max_text = num_text + 8;
          info_ptr->num_text = 0;
-         info_ptr->text = (png_textp)png_malloc(png_ptr,
-            (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+         info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
+             (png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
+         if (info_ptr->text == NULL)
+            return(1);
+         info_ptr->free_me |= PNG_FREE_TEXT;
       }
-      png_debug1(3, "allocated %d entries for info_ptr->text\n",
-         info_ptr->max_text);
-   }
 
+      png_debug1(3, "allocated %d entries for info_ptr->text",
+          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].text == NULL)
-         text_ptr[i].text = (png_charp)"";
+      if (text_ptr[i].key == NULL)
+          continue;
 
-      if (text_ptr[i].text[0] == '\0')
+      if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
+          text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
       {
-         textp->text_length = 0;
-         textp->compression = PNG_TEXT_COMPRESSION_NONE;
+         png_warning(png_ptr, "text compression mode is out of range");
+         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
       {
-         textp->text_length = png_strlen(text_ptr[i].text);
+         /* 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_iTXt_SUPPORTED */
+      {
+         png_warning(png_ptr, "iTXt chunk not supported");
+         continue;
+      }
+#  endif
+
+      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
+      {
+         text_length = 0;
+#  ifdef PNG_iTXt_SUPPORTED
+         if (text_ptr[i].compression > 0)
+            textp->compression = PNG_ITXT_COMPRESSION_NONE;
+
+         else
+#  endif
+            textp->compression = PNG_TEXT_COMPRESSION_NONE;
+      }
+
+      else
+      {
+         text_length = png_strlen(text_ptr[i].text);
          textp->compression = text_ptr[i].compression;
       }
-      textp->text = text_ptr[i].text;
-      textp->key = text_ptr[i].key;
+
+      textp->key = (png_charp)png_malloc_warn(png_ptr,
+          (png_size_t)
+          (key_len + text_length + lang_len + lang_key_len + 4));
+
+      if (textp->key == NULL)
+         return(1);
+
+      png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
+          (unsigned long)(png_uint_32)
+          (key_len + lang_len + lang_key_len + text_length + 4),
+          textp->key);
+
+      png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
+      *(textp->key + key_len) = '\0';
+
+      if (text_ptr[i].compression > 0)
+      {
+         textp->lang = textp->key + key_len + 1;
+         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
+         *(textp->lang + lang_len) = '\0';
+         textp->lang_key = textp->lang + lang_len + 1;
+         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
+         *(textp->lang_key + lang_key_len) = '\0';
+         textp->text = textp->lang_key + lang_key_len + 1;
+      }
+
+      else
+      {
+         textp->lang=NULL;
+         textp->lang_key=NULL;
+         textp->text = textp->key + key_len + 1;
+      }
+
+      if (text_length)
+         png_memcpy(textp->text, text_ptr[i].text,
+             (png_size_t)(text_length));
+
+      *(textp->text + text_length) = '\0';
+
+#  ifdef PNG_iTXt_SUPPORTED
+      if (textp->compression > 0)
+      {
+         textp->text_length = 0;
+         textp->itxt_length = text_length;
+      }
+
+      else
+#  endif
+      {
+         textp->text_length = text_length;
+         textp->itxt_length = 0;
+      }
+
       info_ptr->num_text++;
-      png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
+      png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
    }
+   return(0);
 }
 #endif
 
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
-void
-png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
+#ifdef PNG_tIME_SUPPORTED
+void PNGAPI
+png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)
 {
-   png_debug1(1, "in %s storage function\n", "tIME");
-   if (png_ptr == NULL || info_ptr == NULL)
+   png_debug1(1, "in %s storage function", "tIME");
+
+   if (png_ptr == NULL || info_ptr == NULL ||
+       (png_ptr->mode & PNG_WROTE_tIME))
+      return;
+
+   if (mod_time->month == 0   || mod_time->month > 12  ||
+       mod_time->day   == 0   || mod_time->day   > 31  ||
+       mod_time->hour  > 23   || mod_time->minute > 59 ||
+       mod_time->second > 60)
+   {
+      png_warning(png_ptr, "Ignoring invalid time value");
       return;
+   }
 
-   png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
+   png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time));
    info_ptr->valid |= PNG_INFO_tIME;
 }
 #endif
 
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
-void
+#ifdef 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_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
 {
-   png_debug1(1, "in %s storage function\n", "tRNS");
+   png_debug1(1, "in %s storage function", "tRNS");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   if (trans != NULL)
+   if (trans_alpha != NULL)
    {
-      info_ptr->trans = trans;
+       /* It may not actually be necessary to set png_ptr->trans_alpha here;
+        * we do it for backward compatibility with the way the png_handle_tRNS
+        * function used to do the allocation.
+        */
+
+       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
+
+       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
+       png_ptr->trans_alpha = info_ptr->trans_alpha =
+           (png_bytep)png_malloc(png_ptr, (png_size_t)PNG_MAX_PALETTE_LENGTH);
+
+       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
+          png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
    }
 
-   if (trans_values != NULL)
+   if (trans_color != NULL)
    {
-      png_memcpy(&(info_ptr->trans_values), trans_values,
-         sizeof(png_color_16));
+      int sample_max = (1 << info_ptr->bit_depth);
+
+      if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
+          (int)trans_color->gray > sample_max) ||
+          (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
+          ((int)trans_color->red > sample_max ||
+          (int)trans_color->green > sample_max ||
+          (int)trans_color->blue > sample_max)))
+         png_warning(png_ptr,
+            "tRNS chunk has out-of-range samples for bit_depth");
+
+      png_memcpy(&(info_ptr->trans_color), trans_color,
+         png_sizeof(png_color_16));
+
       if (num_trans == 0)
-        num_trans = 1;
+         num_trans = 1;
    }
+
    info_ptr->num_trans = (png_uint_16)num_trans;
-   info_ptr->valid |= PNG_INFO_tRNS;
+
+   if (num_trans != 0)
+   {
+      info_ptr->valid |= PNG_INFO_tRNS;
+      info_ptr->free_me |= PNG_FREE_TRNS;
+   }
 }
 #endif
 
+#ifdef PNG_sPLT_SUPPORTED
+void PNGAPI
+png_set_sPLT(png_structp png_ptr,
+    png_infop info_ptr, png_const_sPLT_tp entries, int nentries)
+/*
+ *  entries        - array of png_sPLT_t structures
+ *                   to be added to the list of palettes
+ *                   in the info structure.
+ *
+ *  nentries       - number of palette structures to be
+ *                   added.
+ */
+{
+   png_sPLT_tp np;
+   int i;
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   np = (png_sPLT_tp)png_malloc_warn(png_ptr,
+       (info_ptr->splt_palettes_num + nentries) *
+       (png_size_t)png_sizeof(png_sPLT_t));
+
+   if (np == NULL)
+   {
+      png_warning(png_ptr, "No memory for sPLT palettes");
+      return;
+   }
+
+   png_memcpy(np, info_ptr->splt_palettes,
+       info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
+
+   png_free(png_ptr, info_ptr->splt_palettes);
+   info_ptr->splt_palettes=NULL;
+
+   for (i = 0; i < nentries; i++)
+   {
+      png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
+      png_const_sPLT_tp from = entries + i;
+      png_size_t length;
+
+      length = png_strlen(from->name) + 1;
+      to->name = (png_charp)png_malloc_warn(png_ptr, length);
+
+      if (to->name == NULL)
+      {
+         png_warning(png_ptr,
+             "Out of memory while processing sPLT chunk");
+         continue;
+      }
+
+      png_memcpy(to->name, from->name, length);
+      to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
+          from->nentries * png_sizeof(png_sPLT_entry));
+
+      if (to->entries == NULL)
+      {
+         png_warning(png_ptr,
+             "Out of memory while processing sPLT chunk");
+         png_free(png_ptr, to->name);
+         to->name = NULL;
+         continue;
+      }
+
+      png_memcpy(to->entries, from->entries,
+          from->nentries * png_sizeof(png_sPLT_entry));
+
+      to->nentries = from->nentries;
+      to->depth = from->depth;
+   }
+
+   info_ptr->splt_palettes = np;
+   info_ptr->splt_palettes_num += nentries;
+   info_ptr->valid |= PNG_INFO_sPLT;
+   info_ptr->free_me |= PNG_FREE_SPLT;
+}
+#endif /* PNG_sPLT_SUPPORTED */
+
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+void PNGAPI
+png_set_unknown_chunks(png_structp png_ptr,
+   png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
+{
+   png_unknown_chunkp np;
+   int i;
+
+   if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
+      return;
+
+   np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
+       (png_size_t)(info_ptr->unknown_chunks_num + num_unknowns) *
+       png_sizeof(png_unknown_chunk));
+
+   if (np == NULL)
+   {
+      png_warning(png_ptr,
+          "Out of memory while processing unknown chunk");
+      return;
+   }
+
+   png_memcpy(np, info_ptr->unknown_chunks,
+       (png_size_t)info_ptr->unknown_chunks_num *
+       png_sizeof(png_unknown_chunk));
+
+   png_free(png_ptr, info_ptr->unknown_chunks);
+   info_ptr->unknown_chunks = NULL;
+
+   for (i = 0; i < num_unknowns; i++)
+   {
+      png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
+      png_const_unknown_chunkp from = unknowns + i;
+
+      png_memcpy(to->name, from->name, png_sizeof(from->name));
+      to->name[png_sizeof(to->name)-1] = '\0';
+      to->size = from->size;
+
+      /* Note our location in the read or write sequence */
+      to->location = (png_byte)(png_ptr->mode & 0xff);
+
+      if (from->size == 0)
+         to->data=NULL;
+
+      else
+      {
+         to->data = (png_bytep)png_malloc_warn(png_ptr,
+             (png_size_t)from->size);
+
+         if (to->data == NULL)
+         {
+            png_warning(png_ptr,
+                "Out of memory while processing unknown chunk");
+            to->size = 0;
+         }
+
+         else
+            png_memcpy(to->data, from->data, from->size);
+      }
+   }
+
+   info_ptr->unknown_chunks = np;
+   info_ptr->unknown_chunks_num += num_unknowns;
+   info_ptr->free_me |= PNG_FREE_UNKN;
+}
+
+void PNGAPI
+png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
+    int chunk, int location)
+{
+   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
+       info_ptr->unknown_chunks_num)
+      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
+}
+#endif
+
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+png_uint_32 PNGAPI
+png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
+{
+   png_debug(1, "in png_permit_mng_features");
+
+   if (png_ptr == NULL)
+      return (png_uint_32)0;
+
+   png_ptr->mng_features_permitted =
+       (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
+
+   return (png_uint_32)png_ptr->mng_features_permitted;
+}
+#endif
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+void PNGAPI
+png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_const_bytep
+    chunk_list, int num_chunks)
+{
+   png_bytep new_list, p;
+   int i, old_num_chunks;
+   if (png_ptr == NULL)
+      return;
+
+   if (num_chunks == 0)
+   {
+      if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
+         png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+
+      else
+         png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+
+      if (keep == PNG_HANDLE_CHUNK_ALWAYS)
+         png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+
+      else
+         png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+
+      return;
+   }
+
+   if (chunk_list == NULL)
+      return;
+
+   old_num_chunks = png_ptr->num_chunk_list;
+   new_list=(png_bytep)png_malloc(png_ptr,
+       (png_size_t)(5*(num_chunks + old_num_chunks)));
+
+   if (png_ptr->chunk_list != NULL)
+   {
+      png_memcpy(new_list, png_ptr->chunk_list,
+          (png_size_t)(5*old_num_chunks));
+      png_free(png_ptr, png_ptr->chunk_list);
+      png_ptr->chunk_list=NULL;
+   }
+
+   png_memcpy(new_list + 5*old_num_chunks, chunk_list,
+       (png_size_t)(5*num_chunks));
+
+   for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
+      *p=(png_byte)keep;
+
+   png_ptr->num_chunk_list = old_num_chunks + num_chunks;
+   png_ptr->chunk_list = new_list;
+   png_ptr->free_me |= PNG_FREE_LIST;
+}
+#endif
+
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+void PNGAPI
+png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
+    png_user_chunk_ptr read_user_chunk_fn)
+{
+   png_debug(1, "in png_set_read_user_chunk_fn");
+
+   if (png_ptr == NULL)
+      return;
+
+   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
+   png_ptr->user_chunk_ptr = user_chunk_ptr;
+}
+#endif
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+void PNGAPI
+png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
+{
+   png_debug1(1, "in %s storage function", "rows");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
+      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+
+   info_ptr->row_pointers = row_pointers;
+
+   if (row_pointers)
+      info_ptr->valid |= PNG_INFO_IDAT;
+}
+#endif
+
+void PNGAPI
+png_set_compression_buffer_size(png_structp png_ptr, png_size_t size)
+{
+    if (png_ptr == NULL)
+       return;
+
+    png_free(png_ptr, png_ptr->zbuf);
+
+    if (size > ZLIB_IO_MAX)
+    {
+       png_warning(png_ptr, "Attempt to set buffer size beyond max ignored");
+       png_ptr->zbuf_size = ZLIB_IO_MAX;
+       size = ZLIB_IO_MAX; /* must fit */
+    }
+
+    else
+       png_ptr->zbuf_size = (uInt)size;
+
+    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
+
+    /* The following ensures a relatively safe failure if this gets called while
+     * the buffer is actually in use.
+     */
+    png_ptr->zstream.next_out = png_ptr->zbuf;
+    png_ptr->zstream.avail_out = 0;
+    png_ptr->zstream.avail_in = 0;
+}
+
+void PNGAPI
+png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
+{
+   if (png_ptr && info_ptr)
+      info_ptr->valid &= ~mask;
+}
+
+
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+/* This function was added to libpng 1.2.6 */
+void PNGAPI
+png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
+    png_uint_32 user_height_max)
+{
+   /* Images with dimensions larger than these limits will be
+    * rejected by png_set_IHDR().  To accept any PNG datastream
+    * regardless of dimensions, set both limits to 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_structp png_ptr,
+   png_uint_32 user_chunk_cache_max)
+{
+    if (png_ptr)
+       png_ptr->user_chunk_cache_max = user_chunk_cache_max;
+}
+
+/* This function was added to libpng 1.4.1 */
+void PNGAPI
+png_set_chunk_malloc_max (png_structp png_ptr,
+    png_alloc_size_t user_chunk_malloc_max)
+{
+   if (png_ptr)
+      png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
+}
+#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
+
+
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+void PNGAPI
+png_set_benign_errors(png_structp png_ptr, int allowed)
+{
+   png_debug(1, "in png_set_benign_errors");
+
+   if (allowed)
+      png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
+
+   else
+      png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN;
+}
+#endif /* PNG_BENIGN_ERRORS_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */