X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/4946a942d77cf51e00aa56404756e124d7c11411..be8ddd37e3435dad37c5502a8d2894ea4cfb71f9:/src/png/pngset.c

diff --git a/src/png/pngset.c b/src/png/pngset.c
index c691f9e60f..b96866c2a9 100644
--- a/src/png/pngset.c
+++ b/src/png/pngset.c
@@ -1,9 +1,9 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.2.4 - July 8, 2002
+ * Last changed in libpng 1.2.34 [December 18, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 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.)
  *
@@ -15,16 +15,17 @@
 
 #define PNG_INTERNAL
 #include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
 #if defined(PNG_bKGD_SUPPORTED)
 void PNGAPI
 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
 {
-   png_debug1(1, "in %s storage function\n", "bKGD");
+   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
@@ -36,29 +37,10 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
    double white_x, double white_y, double red_x, double red_y,
    double green_x, double green_y, double blue_x, double blue_y)
 {
-   png_debug1(1, "in %s storage function\n", "cHRM");
+   png_debug1(1, "in %s storage function", "cHRM");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   if (white_x < 0.0 || white_y < 0.0 ||
-         red_x < 0.0 ||   red_y < 0.0 ||
-       green_x < 0.0 || green_y < 0.0 ||
-        blue_x < 0.0 ||  blue_y < 0.0)
-   {
-      png_warning(png_ptr,
-        "Ignoring attempt to set negative chromaticity value");
-      return;
-   }
-   if (white_x > 21474.83 || white_y > 21474.83 ||
-         red_x > 21474.83 ||   red_y > 21474.83 ||
-       green_x > 21474.83 || green_y > 21474.83 ||
-        blue_x > 21474.83 ||  blue_y > 21474.83)
-   {
-      png_warning(png_ptr,
-        "Ignoring attempt to set chromaticity value exceeding 21474.83");
-      return;
-   }
-
    info_ptr->x_white = (float)white_x;
    info_ptr->y_white = (float)white_y;
    info_ptr->x_red   = (float)red_x;
@@ -87,50 +69,38 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
    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;
 
-   if (white_x < 0 || white_y < 0 ||
-         red_x < 0 ||   red_y < 0 ||
-       green_x < 0 || green_y < 0 ||
-        blue_x < 0 ||  blue_y < 0)
-   {
-      png_warning(png_ptr,
-        "Ignoring attempt to set negative chromaticity value");
-      return;
-   }
-   if (white_x > (double) PNG_MAX_UINT || white_y > (double) PNG_MAX_UINT ||
-         red_x > (double) PNG_MAX_UINT ||   red_y > (double) PNG_MAX_UINT ||
-       green_x > (double) PNG_MAX_UINT || green_y > (double) PNG_MAX_UINT ||
-        blue_x > (double) PNG_MAX_UINT ||  blue_y > (double) PNG_MAX_UINT)
+#if !defined(PNG_NO_CHECK_cHRM)
+   if (png_check_cHRM_fixed(png_ptr,
+      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y))
+#endif
    {
-      png_warning(png_ptr,
-        "Ignoring attempt to set chromaticity value exceeding 21474.83");
-      return;
-   }
-   info_ptr->int_x_white = white_x;
-   info_ptr->int_y_white = white_y;
-   info_ptr->int_x_red   = red_x;
-   info_ptr->int_y_red   = red_y;
-   info_ptr->int_x_green = green_x;
-   info_ptr->int_y_green = green_y;
-   info_ptr->int_x_blue  = blue_x;
-   info_ptr->int_y_blue  = blue_y;
+     info_ptr->int_x_white = white_x;
+     info_ptr->int_y_white = white_y;
+     info_ptr->int_x_red   = red_x;
+     info_ptr->int_y_red   = red_y;
+     info_ptr->int_x_green = green_x;
+     info_ptr->int_y_green = green_y;
+     info_ptr->int_x_blue  = blue_x;
+     info_ptr->int_y_blue  = blue_y;
 #ifdef PNG_FLOATING_POINT_SUPPORTED
-   info_ptr->x_white = (float)(white_x/100000.);
-   info_ptr->y_white = (float)(white_y/100000.);
-   info_ptr->x_red   = (float)(  red_x/100000.);
-   info_ptr->y_red   = (float)(  red_y/100000.);
-   info_ptr->x_green = (float)(green_x/100000.);
-   info_ptr->y_green = (float)(green_y/100000.);
-   info_ptr->x_blue  = (float)( blue_x/100000.);
-   info_ptr->y_blue  = (float)( blue_y/100000.);
-#endif
-   info_ptr->valid |= PNG_INFO_cHRM;
+     info_ptr->x_white = (float)(white_x/100000.);
+     info_ptr->y_white = (float)(white_y/100000.);
+     info_ptr->x_red   = (float)(  red_x/100000.);
+     info_ptr->y_red   = (float)(  red_y/100000.);
+     info_ptr->x_green = (float)(green_x/100000.);
+     info_ptr->y_green = (float)(green_y/100000.);
+     info_ptr->x_blue  = (float)( blue_x/100000.);
+     info_ptr->y_blue  = (float)( blue_y/100000.);
+#endif
+     info_ptr->valid |= PNG_INFO_cHRM;
+   }
 }
-#endif
-#endif
+#endif /* PNG_FIXED_POINT_SUPPORTED */
+#endif /* PNG_cHRM_SUPPORTED */
 
 #if defined(PNG_gAMA_SUPPORTED)
 #ifdef PNG_FLOATING_POINT_SUPPORTED
@@ -138,7 +108,7 @@ void PNGAPI
 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
 {
    double gamma;
-   png_debug1(1, "in %s storage function\n", "gAMA");
+   png_debug1(1, "in %s storage function", "gAMA");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -149,13 +119,13 @@ png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
       gamma=21474.83;
    }
    else
-      gamma=file_gamma;
+      gamma = file_gamma;
    info_ptr->gamma = (float)gamma;
 #ifdef PNG_FIXED_POINT_SUPPORTED
    info_ptr->int_gamma = (int)(gamma*100000.+.5);
 #endif
    info_ptr->valid |= PNG_INFO_gAMA;
-   if(gamma == 0.0)
+   if (gamma == 0.0)
       png_warning(png_ptr, "Setting gamma=0");
 }
 #endif
@@ -165,24 +135,24 @@ png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
 {
    png_fixed_point 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;
 
-   if (int_gamma > (png_fixed_point) PNG_MAX_UINT)
+   if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
    {
      png_warning(png_ptr, "Limiting gamma to 21474.83");
-     gamma=PNG_MAX_UINT;
+     gamma=PNG_UINT_31_MAX;
    }
    else
    {
      if (int_gamma < 0)
      {
        png_warning(png_ptr, "Setting negative gamma to zero");
-       gamma=0;
+       gamma = 0;
      }
      else
-       gamma=int_gamma;
+       gamma = int_gamma;
    }
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    info_ptr->gamma = (float)(gamma/100000.);
@@ -191,7 +161,7 @@ png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
    info_ptr->int_gamma = gamma;
 #endif
    info_ptr->valid |= PNG_INFO_gAMA;
-   if(gamma == 0)
+   if (gamma == 0)
       png_warning(png_ptr, "Setting gamma=0");
 }
 #endif
@@ -202,22 +172,24 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
 {
    int i;
 
-   png_debug1(1, "in %s storage function\n", "hIST");
+   png_debug1(1, "in %s storage function", "hIST");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
-   if (info_ptr->num_palette == 0)
+   if (info_ptr->num_palette == 0 || info_ptr->num_palette
+       > PNG_MAX_PALETTE_LENGTH)
    {
        png_warning(png_ptr,
-          "Palette size 0, hIST allocation skipped.");
+          "Invalid palette size, hIST allocation skipped.");
        return;
    }
 
 #ifdef PNG_FREE_ME_SUPPORTED
    png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
 #endif
-   /* Changed from info->num_palette to 256 in version 1.2.1 */
+   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
+      1.2.1 */
    png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
-      (png_uint_32)(256 * sizeof (png_uint_16)));
+      (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));
    if (png_ptr->hist == NULL)
      {
        png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
@@ -243,16 +215,29 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    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;
 
    /* check for width and height valid values */
    if (width == 0 || height == 0)
       png_error(png_ptr, "Image width or height is zero in IHDR");
-   if (width > PNG_MAX_UINT || height > PNG_MAX_UINT)
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
+      png_error(png_ptr, "image size exceeds user limits in IHDR");
+#else
+   if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
+      png_error(png_ptr, "image size exceeds user limits in IHDR");
+#endif
+   if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
       png_error(png_ptr, "Invalid image size in IHDR");
+   if ( width > (PNG_UINT_32_MAX
+                 >> 3)      /* 8-byte RGBA pixels */
+                 - 64       /* bigrowbuf hack */
+                 - 1        /* filter byte */
+                 - 7*8      /* rounding of width to multiple of 8 pixels */
+                 - 8)       /* extra max_pixel_depth pad */
+      png_warning(png_ptr, "Width is too large for libpng to process pixels");
 
    /* check other values */
    if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
@@ -285,21 +270,21 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
     * 4. The filter_method is 64 and
     * 5. The color_type is RGB or RGBA
     */
-   if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
-      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
-   if(filter_type != PNG_FILTER_TYPE_BASE)
+   if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
+      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+   if (filter_type != PNG_FILTER_TYPE_BASE)
    {
-     if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+     if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
         (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
         ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
-        (color_type == PNG_COLOR_TYPE_RGB || 
+        (color_type == PNG_COLOR_TYPE_RGB ||
          color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
         png_error(png_ptr, "Unknown filter method in IHDR");
-     if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
+     if (png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
         png_warning(png_ptr, "Invalid filter method in IHDR");
    }
 #else
-   if(filter_type != PNG_FILTER_TYPE_BASE)
+   if (filter_type != PNG_FILTER_TYPE_BASE)
       png_error(png_ptr, "Unknown filter method in IHDR");
 #endif
 
@@ -320,16 +305,16 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
       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_MAX_UINT/rowbytes_per_pixel - 64)
-   {
-      png_warning(png_ptr,
-         "Width too large to process image data; rowbytes will overflow.");
+   /* check for potential overflow */
+   if (width > (PNG_UINT_32_MAX
+                 >> 3)      /* 8-byte RGBA pixels */
+                 - 64       /* bigrowbuf hack */
+                 - 1        /* filter byte */
+                 - 7*8      /* rounding of width to multiple of 8 pixels */
+                 - 8)       /* extra max_pixel_depth pad */
       info_ptr->rowbytes = (png_size_t)0;
-   }
    else
-      info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
+      info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
 }
 
 #if defined(PNG_oFFs_SUPPORTED)
@@ -337,7 +322,7 @@ void PNGAPI
 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
    png_int_32 offset_x, png_int_32 offset_y, int unit_type)
 {
-   png_debug1(1, "in %s storage function\n", "oFFs");
+   png_debug1(1, "in %s storage function", "oFFs");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -357,56 +342,59 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 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 (%lu bytes)\n", length);
+   png_debug1(3, "allocating purpose for info (%lu bytes)",
+     (unsigned long)length);
    info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
    if (info_ptr->pcal_purpose == NULL)
-     {
+   {
        png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
-       return;
-     }
+      return;
+   }
    png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)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 (%lu bytes)\n", length);
+   png_debug1(3, "allocating units for info (%lu bytes)",
+     (unsigned long)length);
    info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
    if (info_ptr->pcal_units == NULL)
-     {
+   {
        png_warning(png_ptr, "Insufficient memory for pCAL units.");
-       return;
-     }
+      return;
+   }
    png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
 
    info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
-      (png_uint_32)((nparams + 1) * sizeof(png_charp)));
+      (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
    if (info_ptr->pcal_params == NULL)
-     {
+   {
        png_warning(png_ptr, "Insufficient memory for pCAL params.");
-       return;
-     }
+      return;
+   }
 
    info_ptr->pcal_params[nparams] = NULL;
 
    for (i = 0; i < nparams; i++)
    {
       length = png_strlen(params[i]) + 1;
-      png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
+      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
+        (unsigned long)length);
       info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
       if (info_ptr->pcal_params[i] == NULL)
-        {
+      {
           png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
           return;
-        }
+      }
       png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
    }
 
@@ -423,7 +411,7 @@ void PNGAPI
 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
              int unit, double width, double height)
 {
-   png_debug1(1, "in %s storage function\n", "sCAL");
+   png_debug1(1, "in %s storage function", "sCAL");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -441,22 +429,37 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
 {
    png_uint_32 length;
 
-   png_debug1(1, "in %s storage function\n", "sCAL");
+   png_debug1(1, "in %s storage function", "sCAL");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->scal_unit = (png_byte)unit;
 
    length = png_strlen(swidth) + 1;
-   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
-   info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
+   png_debug1(3, "allocating unit for info (%u bytes)",
+      (unsigned int)length);
+   info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
+   if (info_ptr->scal_s_width == NULL)
+   {
+      png_warning(png_ptr,
+       "Memory allocation failed while processing sCAL.");
+      return;
+   }
    png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
 
    length = png_strlen(sheight) + 1;
-   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
-   info_ptr->scal_s_height = (png_charp)png_malloc(png_ptr, length);
+   png_debug1(3, "allocating unit for info (%u bytes)",
+      (unsigned int)length);
+   info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
+   if (info_ptr->scal_s_height == NULL)
+   {
+      png_free (png_ptr, info_ptr->scal_s_width);
+      info_ptr->scal_s_width = NULL;
+      png_warning(png_ptr,
+       "Memory allocation failed while processing sCAL.");
+      return;
+   }
    png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
-
    info_ptr->valid |= PNG_INFO_sCAL;
 #ifdef PNG_FREE_ME_SUPPORTED
    info_ptr->free_me |= PNG_FREE_SCAL;
@@ -471,7 +474,7 @@ void PNGAPI
 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
 {
-   png_debug1(1, "in %s storage function\n", "pHYs");
+   png_debug1(1, "in %s storage function", "pHYs");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -487,10 +490,21 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
    png_colorp palette, int num_palette)
 {
 
-   png_debug1(1, "in %s storage function\n", "PLTE");
+   png_debug1(1, "in %s storage function", "PLTE");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
+   if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
+     {
+       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+         png_error(png_ptr, "Invalid palette length");
+       else
+       {
+         png_warning(png_ptr, "Invalid palette length");
+         return;
+       }
+     }
+
    /*
     * It may not actually be necessary to set png_ptr->palette here;
     * we do it for backward compatibility with the way the png_handle_tRNS
@@ -499,13 +513,15 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FREE_ME_SUPPORTED
    png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
 #endif
-   /* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
+
+   /* 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_zalloc(png_ptr, (uInt)256,
-      sizeof (png_color));
-   if (png_ptr->palette == NULL)
-      png_error(png_ptr, "Unable to malloc palette");
-   png_memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
+   png_ptr->palette = (png_colorp)png_malloc(png_ptr,
+      PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
+   png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
+      png_sizeof(png_color));
+   png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color));
    info_ptr->palette = png_ptr->palette;
    info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
 
@@ -523,11 +539,11 @@ void PNGAPI
 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
    png_color_8p sig_bit)
 {
-   png_debug1(1, "in %s storage function\n", "sBIT");
+   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
@@ -536,7 +552,7 @@ png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
 void PNGAPI
 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int 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;
 
@@ -560,12 +576,10 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
 #endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
    png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
       int_green_y, int_blue_x, int_blue_y;
 #endif
-#endif
-   png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
+   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -583,7 +597,6 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 #endif
 
 #if defined(PNG_cHRM_SUPPORTED)
-#ifdef PNG_FIXED_POINT_SUPPORTED
    int_white_x = 31270L;
    int_white_y = 32900L;
    int_red_x   = 64000L;
@@ -593,10 +606,6 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
    int_blue_x  = 15000L;
    int_blue_y  =  6000L;
 
-   png_set_cHRM_fixed(png_ptr, info_ptr,
-      int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
-      int_blue_x, int_blue_y);
-#endif
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    white_x = (float).3127;
    white_y = (float).3290;
@@ -606,11 +615,25 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
    green_y = (float).60;
    blue_x  = (float).15;
    blue_y  = (float).06;
+#endif
 
-   png_set_cHRM(png_ptr, info_ptr,
-      white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
+#if !defined(PNG_NO_CHECK_cHRM)
+   if (png_check_cHRM_fixed(png_ptr,
+      int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
+      int_green_y, int_blue_x, int_blue_y))
+#endif
+   {
+#ifdef PNG_FIXED_POINT_SUPPORTED
+     png_set_cHRM_fixed(png_ptr, info_ptr,
+        int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
+        int_green_y, int_blue_x, int_blue_y);
 #endif
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+      png_set_cHRM(png_ptr, info_ptr,
+         white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
 #endif
+   }
+#endif /* cHRM */
 }
 #endif
 
@@ -623,14 +646,28 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
 {
    png_charp new_iccp_name;
    png_charp new_iccp_profile;
+   png_uint_32 length;
 
-   png_debug1(1, "in %s storage function\n", "iCCP");
+   png_debug1(1, "in %s storage function", "iCCP");
    if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
       return;
 
-   new_iccp_name = (png_charp)png_malloc(png_ptr, png_strlen(name)+1);
-   png_strcpy(new_iccp_name, name);
-   new_iccp_profile = (png_charp)png_malloc(png_ptr, proflen);
+   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_charp)png_malloc_warn(png_ptr, proflen);
+   if (new_iccp_profile == NULL)
+   {
+      png_free (png_ptr, new_iccp_name);
+      png_warning(png_ptr,
+      "Insufficient memory to process iCCP profile.");
+      return;
+   }
    png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
 
    png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
@@ -654,7 +691,7 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
    int num_text)
 {
    int ret;
-   ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
+   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
    if (ret)
      png_error(png_ptr, "Insufficient memory to store text");
 }
@@ -665,7 +702,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 {
    int i;
 
-   png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
+   png_debug1(1, "in %s storage function", (png_ptr->chunk_name[0] == '\0' ?
       "text" : (png_const_charp)png_ptr->chunk_name));
 
    if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
@@ -685,14 +722,14 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          info_ptr->max_text = info_ptr->num_text + num_text + 8;
          old_text = info_ptr->text;
          info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
-            (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+            (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
          if (info_ptr->text == NULL)
            {
              png_free(png_ptr, old_text);
              return(1);
            }
          png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
-            sizeof(png_text)));
+            png_sizeof(png_text)));
          png_free(png_ptr, old_text);
       }
       else
@@ -700,20 +737,20 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          info_ptr->max_text = num_text + 8;
          info_ptr->num_text = 0;
          info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
-            (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+            (png_uint_32)(info_ptr->max_text * png_sizeof(png_text)));
          if (info_ptr->text == NULL)
            return(1);
 #ifdef PNG_FREE_ME_SUPPORTED
          info_ptr->free_me |= PNG_FREE_TEXT;
 #endif
       }
-      png_debug1(3, "allocated %d entries for info_ptr->text\n",
+      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_size_t text_length, key_len;
+      png_size_t lang_len, lang_key_len;
       png_textp textp = &(info_ptr->text[info_ptr->num_text]);
 
       if (text_ptr[i].key == NULL)
@@ -721,7 +758,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 
       key_len = png_strlen(text_ptr[i].key);
 
-      if(text_ptr[i].compression <= 0)
+      if (text_ptr[i].compression <= 0)
       {
         lang_len = 0;
         lang_key_len = 0;
@@ -750,7 +787,7 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
       {
          text_length = 0;
 #ifdef PNG_iTXt_SUPPORTED
-         if(text_ptr[i].compression > 0)
+         if (text_ptr[i].compression > 0)
             textp->compression = PNG_ITXT_COMPRESSION_NONE;
          else
 #endif
@@ -763,26 +800,28 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
       }
 
       textp->key = (png_charp)png_malloc_warn(png_ptr,
-         (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
+         (png_uint_32)
+         (key_len + text_length + lang_len + lang_key_len + 4));
       if (textp->key == NULL)
         return(1);
-      png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
-         (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
+      png_debug2(2, "Allocated %lu bytes at %x in png_set_text",
+         (png_uint_32)
+         (key_len + lang_len + lang_key_len + text_length + 4),
          (int)textp->key);
 
       png_memcpy(textp->key, text_ptr[i].key,
          (png_size_t)(key_len));
-      *(textp->key+key_len) = '\0';
+      *(textp->key + key_len) = '\0';
 #ifdef PNG_iTXt_SUPPORTED
       if (text_ptr[i].compression > 0)
       {
-         textp->lang=textp->key + key_len + 1;
+         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;
+         *(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;
+         *(textp->lang_key + lang_key_len) = '\0';
+         textp->text = textp->lang_key + lang_key_len + 1;
       }
       else
 #endif
@@ -791,15 +830,15 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          textp->lang=NULL;
          textp->lang_key=NULL;
 #endif
-         textp->text=textp->key + key_len + 1;
+         textp->text = textp->key + key_len + 1;
       }
-      if(text_length)
+      if (text_length)
          png_memcpy(textp->text, text_ptr[i].text,
             (png_size_t)(text_length));
-      *(textp->text+text_length) = '\0';
+      *(textp->text + text_length) = '\0';
 
 #ifdef PNG_iTXt_SUPPORTED
-      if(textp->compression > 0)
+      if (textp->compression > 0)
       {
          textp->text_length = 0;
          textp->itxt_length = text_length;
@@ -812,9 +851,8 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          textp->itxt_length = 0;
 #endif
       }
-      info_ptr->text[info_ptr->num_text]= *textp;
       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);
 }
@@ -824,12 +862,12 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 void PNGAPI
 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
 {
-   png_debug1(1, "in %s storage function\n", "tIME");
+   png_debug1(1, "in %s storage function", "tIME");
    if (png_ptr == NULL || info_ptr == NULL ||
        (png_ptr->mode & PNG_WROTE_tIME))
       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
@@ -839,7 +877,7 @@ void PNGAPI
 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_bytep trans, int num_trans, png_color_16p trans_values)
 {
-   png_debug1(1, "in %s storage function\n", "tRNS");
+   png_debug1(1, "in %s storage function", "tRNS");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
@@ -850,29 +888,45 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
         * we do it for backward compatibility with the way the png_handle_tRNS
         * function used to do the allocation.
         */
+
 #ifdef PNG_FREE_ME_SUPPORTED
        png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
 #endif
-       /* Changed from num_trans to 256 in version 1.2.1 */
+
+       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
        png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
-           (png_uint_32)256);
-       png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
-#ifdef PNG_FREE_ME_SUPPORTED
-       info_ptr->free_me |= PNG_FREE_TRNS;
-#else
-       png_ptr->flags |= PNG_FLAG_FREE_TRNS;
-#endif
+           (png_uint_32)PNG_MAX_PALETTE_LENGTH);
+       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
+         png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
    }
 
    if (trans_values != NULL)
    {
+      int sample_max = (1 << info_ptr->bit_depth);
+      if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
+          (int)trans_values->gray > sample_max) ||
+          (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
+          ((int)trans_values->red > sample_max ||
+          (int)trans_values->green > sample_max ||
+          (int)trans_values->blue > sample_max)))
+        png_warning(png_ptr,
+           "tRNS chunk has out-of-range samples for bit_depth");
       png_memcpy(&(info_ptr->trans_values), trans_values,
-         sizeof(png_color_16));
+         png_sizeof(png_color_16));
       if (num_trans == 0)
         num_trans = 1;
    }
+
    info_ptr->num_trans = (png_uint_16)num_trans;
-   info_ptr->valid |= PNG_INFO_tRNS;
+   if (num_trans != 0)
+   {
+      info_ptr->valid |= PNG_INFO_tRNS;
+#ifdef PNG_FREE_ME_SUPPORTED
+      info_ptr->free_me |= PNG_FREE_TRNS;
+#else
+      png_ptr->flags |= PNG_FLAG_FREE_TRNS;
+#endif
+   }
 }
 #endif
 
@@ -880,12 +934,23 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
 void PNGAPI
 png_set_sPLT(png_structp png_ptr,
              png_infop info_ptr, png_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) * sizeof(png_sPLT_t));
+        (info_ptr->splt_palettes_num + nentries) *
+        (png_uint_32)png_sizeof(png_sPLT_t));
     if (np == NULL)
     {
       png_warning(png_ptr, "No memory for sPLT palettes.");
@@ -893,7 +958,7 @@ png_set_sPLT(png_structp png_ptr,
     }
 
     png_memcpy(np, info_ptr->splt_palettes,
-           info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
+           info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
     png_free(png_ptr, info_ptr->splt_palettes);
     info_ptr->splt_palettes=NULL;
 
@@ -901,14 +966,29 @@ png_set_sPLT(png_structp png_ptr,
     {
         png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
         png_sPLT_tp from = entries + i;
+        png_uint_32 length;
 
-        to->name = (png_charp)png_malloc(png_ptr,
-            png_strlen(from->name) + 1);
-        png_strcpy(to->name, from->name);
-        to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
-            from->nentries * sizeof(png_sPLT_t));
+        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,
+            (png_uint_32)(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 * sizeof(png_sPLT_t));
+            from->nentries * png_sizeof(png_sPLT_entry));
         to->nentries = from->nentries;
         to->depth = from->depth;
     }
@@ -934,36 +1014,48 @@ png_set_unknown_chunks(png_structp png_ptr,
         return;
 
     np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
-        (info_ptr->unknown_chunks_num + num_unknowns) *
-        sizeof(png_unknown_chunk));
+        (png_uint_32)((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.");
+       png_warning(png_ptr,
+          "Out of memory while processing unknown chunk.");
        return;
     }
 
     png_memcpy(np, info_ptr->unknown_chunks,
-           info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
+           info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
     png_free(png_ptr, info_ptr->unknown_chunks);
     info_ptr->unknown_chunks=NULL;
 
     for (i = 0; i < num_unknowns; i++)
     {
-        png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
-        png_unknown_chunkp from = unknowns + i;
-
-        png_strcpy((png_charp)to->name, (png_charp)from->name);
-        to->data = (png_bytep)png_malloc(png_ptr, from->size);
-        if (to->data == NULL)
-           png_warning(png_ptr, "Out of memory while processing unknown chunk.");
-        else
-        {
-          png_memcpy(to->data, from->data, from->size);
-          to->size = from->size;
-
-          /* note our location in the read or write sequence */
-          to->location = (png_byte)(png_ptr->mode & 0xff);
-        }
+       png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
+       png_unknown_chunkp from = unknowns + i;
+
+       png_memcpy((png_charp)to->name, 
+                  (png_charp)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_uint_32)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;
@@ -976,33 +1068,35 @@ 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 <
+   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
          (int)info_ptr->unknown_chunks_num)
       info_ptr->unknown_chunks[chunk].location = (png_byte)location;
 }
 #endif
 
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
 void PNGAPI
 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
 {
    /* This function is deprecated in favor of png_permit_mng_features()
-      and will be removed from libpng-2.0.0 */
-   png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
+      and will be removed from libpng-1.3.0 */
+   png_debug(1, "in png_permit_empty_plte, DEPRECATED.");
    if (png_ptr == NULL)
       return;
    png_ptr->mng_features_permitted = (png_byte)
-     ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
+     ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) |
      ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
 }
 #endif
+#endif
 
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
 png_uint_32 PNGAPI
 png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
 {
-   png_debug(1, "in png_permit_mng_features\n");
+   png_debug(1, "in png_permit_mng_features");
    if (png_ptr == NULL)
       return (png_uint_32)0;
    png_ptr->mng_features_permitted =
@@ -1018,14 +1112,16 @@ png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
 {
     png_bytep new_list, p;
     int i, old_num_chunks;
+    if (png_ptr == NULL)
+       return;
     if (num_chunks == 0)
     {
-      if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
+      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 == HANDLE_CHUNK_ALWAYS)
+      if (keep == PNG_HANDLE_CHUNK_ALWAYS)
         png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
       else
         png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
@@ -1033,22 +1129,23 @@ png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
     }
     if (chunk_list == NULL)
       return;
-    old_num_chunks=png_ptr->num_chunk_list;
+    old_num_chunks = png_ptr->num_chunk_list;
     new_list=(png_bytep)png_malloc(png_ptr,
-       (png_uint_32)(5*(num_chunks+old_num_chunks)));
-    if(png_ptr->chunk_list != NULL)
+       (png_uint_32)
+       (5*(num_chunks + old_num_chunks)));
+    if (png_ptr->chunk_list != NULL)
     {
        png_memcpy(new_list, png_ptr->chunk_list,
           (png_size_t)(5*old_num_chunks));
        png_free(png_ptr, png_ptr->chunk_list);
        png_ptr->chunk_list=NULL;
     }
-    png_memcpy(new_list+5*old_num_chunks, chunk_list,
+    png_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)
+    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->num_chunk_list = old_num_chunks + num_chunks;
+    png_ptr->chunk_list = new_list;
 #ifdef PNG_FREE_ME_SUPPORTED
     png_ptr->free_me |= PNG_FREE_LIST;
 #endif
@@ -1060,7 +1157,9 @@ void PNGAPI
 png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
    png_user_chunk_ptr read_user_chunk_fn)
 {
-   png_debug(1, "in png_set_read_user_chunk_fn\n");
+   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;
 }
@@ -1070,91 +1169,84 @@ png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
 void PNGAPI
 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
 {
-   png_debug1(1, "in %s storage function\n", "rows");
+   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))
+   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)
+   if (row_pointers)
       info_ptr->valid |= PNG_INFO_IDAT;
 }
 #endif
 
+#ifdef PNG_WRITE_SUPPORTED
 void PNGAPI
-png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
+png_set_compression_buffer_size(png_structp png_ptr,
+    png_uint_32 size)
 {
-    if(png_ptr->zbuf)
-       png_free(png_ptr, png_ptr->zbuf);
+    if (png_ptr == NULL)
+       return;
+    png_free(png_ptr, png_ptr->zbuf);
     png_ptr->zbuf_size = (png_size_t)size;
     png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
     png_ptr->zstream.next_out = png_ptr->zbuf;
     png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 }
+#endif
 
 void PNGAPI
 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
 {
    if (png_ptr && info_ptr)
-      info_ptr->valid &= ~(mask);
+      info_ptr->valid &= ~mask;
 }
 
 
 #ifndef PNG_1_0_X
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-/* this function was added to libpng 1.2.0 and should always exist by default */
+/* function was added to libpng 1.2.0 and should always exist by default */
 void PNGAPI
 png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
 {
-    png_uint_32 settable_asm_flags;
-    png_uint_32 settable_mmx_flags;
-
-    settable_mmx_flags =
-#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-                         PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
-#endif
-#ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
-                         PNG_ASM_FLAG_MMX_READ_INTERLACE    |
-#endif
-#ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-                         PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
-                         PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
-                         PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
-                         PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
-#endif
-                         0;
-
-    /* could be some non-MMX ones in the future, but not currently: */
-    settable_asm_flags = settable_mmx_flags;
-
-    if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
-        !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
-    {
-        /* clear all MMX flags if MMX isn't supported */
-        settable_asm_flags &= ~settable_mmx_flags;
-        png_ptr->asm_flags &= ~settable_mmx_flags;
-    }
-
-    /* we're replacing the settable bits with those passed in by the user,
-     * so first zero them out of the master copy, then logical-OR in the
-     * allowed subset that was requested */
-
-    png_ptr->asm_flags &= ~settable_asm_flags;               /* zero them */
-    png_ptr->asm_flags |= (asm_flags & settable_asm_flags);  /* set them */
+/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
+    if (png_ptr != NULL)
+    png_ptr->asm_flags = 0;
+    asm_flags = asm_flags; /* Quiet the compiler */
 }
-#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
 
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
 /* this function was added to libpng 1.2.0 */
 void PNGAPI
 png_set_mmx_thresholds (png_structp png_ptr,
                         png_byte mmx_bitdepth_threshold,
                         png_uint_32 mmx_rowbytes_threshold)
 {
-    png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
-    png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
+/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
+    if (png_ptr == NULL)
+       return;
+    /* Quiet the compiler */
+    mmx_bitdepth_threshold = mmx_bitdepth_threshold;
+    mmx_rowbytes_threshold = mmx_rowbytes_threshold;
 }
 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+/* this function was added to libpng 1.2.6 */
+void PNGAPI
+png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
+    png_uint_32 user_height_max)
+{
+    /* Images with dimensions larger than these limits will be
+     * rejected by png_set_IHDR().  To accept any PNG datastream
+     * regardless of dimensions, set both limits to 0x7ffffffL.
+     */
+    if (png_ptr == NULL) return;
+    png_ptr->user_width_max = user_width_max;
+    png_ptr->user_height_max = user_height_max;
+}
+#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
+
 #endif /* ?PNG_1_0_X */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */