Add some version checks to help compiling on OSX.

[wxWidgets.git] / src / png / pngwrite.c

diff --git a/src/png/pngwrite.c b/src/png/pngwrite.c
index cc70ae1857f73598b0fa9208146e61a2728ea162..0252051989c05183d37e711e34c27fb36dbfe73b 100644 (file)
--- a/src/png/pngwrite.c
+++ b/src/png/pngwrite.c
@@ -1,17 +1,21 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
 
 /* pngwrite.c - general routines to write a PNG file
  *

- * libpng 1.2.6 - August 15, 2004
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Last changed in libpng 1.4.0 [January 3, 2010]
+ * Copyright (c) 1998-2010 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.)
  * (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

  */
 
  */
 

-/* get internal access to png.h */
-#define PNG_INTERNAL
+/* Get internal access to png.h */
+#define PNG_NO_PEDANTIC_WARNINGS

 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED

+#include "pngpriv.h"

 
 /* Writes all the PNG information.  This is the suggested way to use the
  * library.  If you have a new chunk to add, make a function to write it,
 
 /* Writes all the PNG information.  This is the suggested way to use the
  * library.  If you have a new chunk to add, make a function to write it,


@@ -25,29 +29,35 @@
 void PNGAPI
 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 {
 void PNGAPI
 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 {

-   png_debug(1, "in png_write_info_before_PLTE\n");
+   png_debug(1, "in png_write_info_before_PLTE");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;

    if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
    {
    if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
    {

-   png_write_sig(png_ptr); /* write PNG signature */
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
-   if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
+   /* Write PNG signature */
+   png_write_sig(png_ptr);
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   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");
-      png_ptr->mng_features_permitted=0;
+      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+      png_ptr->mng_features_permitted = 0;

    }
 #endif
    }
 #endif

-   /* write IHDR information. */
+   /* Write IHDR information. */

    png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
       info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
       info_ptr->filter_type,
    png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
       info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
       info_ptr->filter_type,

-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED

       info_ptr->interlace_type);
 #else
       0);
 #endif
       info_ptr->interlace_type);
 #else
       0);
 #endif

-   /* the rest of these check to see if the valid field has the appropriate
-      flag set, and if it does, writes the chunk. */
-#if defined(PNG_WRITE_gAMA_SUPPORTED)
+   /* The rest of these check to see if the valid field has the appropriate
+    * flag set, and if it does, writes the chunk.
+    */
+#ifdef PNG_WRITE_gAMA_SUPPORTED

    if (info_ptr->valid & PNG_INFO_gAMA)
    {
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
    if (info_ptr->valid & PNG_INFO_gAMA)
    {
 #  ifdef PNG_FLOATING_POINT_SUPPORTED


@@ -59,20 +69,20 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #endif
    }
 #endif
 #endif
    }
 #endif

-#if defined(PNG_WRITE_sRGB_SUPPORTED)
+#ifdef PNG_WRITE_sRGB_SUPPORTED

    if (info_ptr->valid & PNG_INFO_sRGB)
       png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
 #endif
    if (info_ptr->valid & PNG_INFO_sRGB)
       png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
 #endif

-#if defined(PNG_WRITE_iCCP_SUPPORTED)
+#ifdef PNG_WRITE_iCCP_SUPPORTED

    if (info_ptr->valid & PNG_INFO_iCCP)
       png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
                      info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
 #endif
    if (info_ptr->valid & PNG_INFO_iCCP)
       png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
                      info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
 #endif

-#if defined(PNG_WRITE_sBIT_SUPPORTED)
+#ifdef PNG_WRITE_sBIT_SUPPORTED

    if (info_ptr->valid & PNG_INFO_sBIT)
       png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
 #endif
    if (info_ptr->valid & PNG_INFO_sBIT)
       png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
 #endif

-#if defined(PNG_WRITE_cHRM_SUPPORTED)
+#ifdef PNG_WRITE_cHRM_SUPPORTED

    if (info_ptr->valid & PNG_INFO_cHRM)
    {
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    if (info_ptr->valid & PNG_INFO_cHRM)
    {
 #ifdef PNG_FLOATING_POINT_SUPPORTED


@@ -92,27 +102,29 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #endif
    }
 #endif
 #endif
    }
 #endif

-#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED

    if (info_ptr->unknown_chunks_num)
    {
    if (info_ptr->unknown_chunks_num)
    {

-       png_unknown_chunk *up;
+      png_unknown_chunk *up;

 
 

-       png_debug(5, "writing extra chunks\n");
+      png_debug(5, "writing extra chunks");

 
 

-       for (up = info_ptr->unknown_chunks;
-            up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
-            up++)
-       {
-         int keep=png_handle_as_unknown(png_ptr, up->name);
+      for (up = info_ptr->unknown_chunks;
+           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+           up++)
+      {
+         int keep = png_handle_as_unknown(png_ptr, up->name);

          if (keep != PNG_HANDLE_CHUNK_NEVER &&
             up->location && !(up->location & PNG_HAVE_PLTE) &&
             !(up->location & PNG_HAVE_IDAT) &&
             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
             (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
          {
          if (keep != PNG_HANDLE_CHUNK_NEVER &&
             up->location && !(up->location & PNG_HAVE_PLTE) &&
             !(up->location & PNG_HAVE_IDAT) &&
             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
             (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
          {

+            if (up->size == 0)
+               png_warning(png_ptr, "Writing zero-length unknown chunk");

             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }
             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }

-       }
+      }

    }
 #endif
       png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
    }
 #endif
       png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;


@@ -126,7 +138,10 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
    int i;
 #endif
 
    int i;
 #endif
 

-   png_debug(1, "in png_write_info\n");
+   png_debug(1, "in png_write_info");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;

 
    png_write_info_before_PLTE(png_ptr, info_ptr);
 
 
    png_write_info_before_PLTE(png_ptr, info_ptr);
 


@@ -134,87 +149,94 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
       png_write_PLTE(png_ptr, info_ptr->palette,
          (png_uint_32)info_ptr->num_palette);
    else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
       png_write_PLTE(png_ptr, info_ptr->palette,
          (png_uint_32)info_ptr->num_palette);
    else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)

-      png_error(png_ptr, "Valid palette required for paletted images\n");
+      png_error(png_ptr, "Valid palette required for paletted images");

 
 

-#if defined(PNG_WRITE_tRNS_SUPPORTED)
+#ifdef PNG_WRITE_tRNS_SUPPORTED

    if (info_ptr->valid & PNG_INFO_tRNS)
    if (info_ptr->valid & PNG_INFO_tRNS)

+   {
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+      /* Invert the alpha channel (in tRNS) */
+      if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
+         info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)

       {
       {

-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-         /* invert the alpha channel (in tRNS) */
-         if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
-            info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-         {
-            int j;
-            for (j=0; j<(int)info_ptr->num_trans; j++)
-               info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
-         }
+         int j;
+         for (j = 0; j<(int)info_ptr->num_trans; j++)
+            info_ptr->trans_alpha[j] = (png_byte)(255 - info_ptr->trans_alpha[j]);
+      }

 #endif
 #endif

-      png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
+      png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),

          info_ptr->num_trans, info_ptr->color_type);
          info_ptr->num_trans, info_ptr->color_type);

-      }
+   }

 #endif
 #endif

-#if defined(PNG_WRITE_bKGD_SUPPORTED)
+#ifdef PNG_WRITE_bKGD_SUPPORTED

    if (info_ptr->valid & PNG_INFO_bKGD)
       png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
 #endif
    if (info_ptr->valid & PNG_INFO_bKGD)
       png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
 #endif

-#if defined(PNG_WRITE_hIST_SUPPORTED)
+#ifdef PNG_WRITE_hIST_SUPPORTED

    if (info_ptr->valid & PNG_INFO_hIST)
       png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
 #endif
    if (info_ptr->valid & PNG_INFO_hIST)
       png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
 #endif

-#if defined(PNG_WRITE_oFFs_SUPPORTED)
+#ifdef PNG_WRITE_oFFs_SUPPORTED

    if (info_ptr->valid & PNG_INFO_oFFs)
       png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
          info_ptr->offset_unit_type);
 #endif
    if (info_ptr->valid & PNG_INFO_oFFs)
       png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
          info_ptr->offset_unit_type);
 #endif

-#if defined(PNG_WRITE_pCAL_SUPPORTED)
+#ifdef PNG_WRITE_pCAL_SUPPORTED

    if (info_ptr->valid & PNG_INFO_pCAL)
       png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
          info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
          info_ptr->pcal_units, info_ptr->pcal_params);
 #endif
    if (info_ptr->valid & PNG_INFO_pCAL)
       png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
          info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
          info_ptr->pcal_units, info_ptr->pcal_params);
 #endif

-#if defined(PNG_WRITE_sCAL_SUPPORTED)
+
+#ifdef PNG_sCAL_SUPPORTED

    if (info_ptr->valid & PNG_INFO_sCAL)
    if (info_ptr->valid & PNG_INFO_sCAL)

-#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+#ifdef PNG_WRITE_sCAL_SUPPORTED
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)

       png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
       png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);

-#else
+#else /* !FLOATING_POINT */

 #ifdef PNG_FIXED_POINT_SUPPORTED
       png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_s_width, info_ptr->scal_s_height);
 #ifdef PNG_FIXED_POINT_SUPPORTED
       png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_s_width, info_ptr->scal_s_height);

-#else
+#endif /* FIXED_POINT */
+#endif /* FLOATING_POINT */
+#else  /* !WRITE_sCAL */

       png_warning(png_ptr,
       png_warning(png_ptr,

-          "png_write_sCAL not supported; sCAL chunk not written.\n");
-#endif
-#endif
-#endif
-#if defined(PNG_WRITE_pHYs_SUPPORTED)
+          "png_write_sCAL not supported; sCAL chunk not written");
+#endif /* WRITE_sCAL */
+#endif /* sCAL */
+
+#ifdef PNG_WRITE_pHYs_SUPPORTED

    if (info_ptr->valid & PNG_INFO_pHYs)
       png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
          info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
    if (info_ptr->valid & PNG_INFO_pHYs)
       png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
          info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);

-#endif
-#if defined(PNG_WRITE_tIME_SUPPORTED)
+#endif /* pHYs */
+
+#ifdef PNG_WRITE_tIME_SUPPORTED

    if (info_ptr->valid & PNG_INFO_tIME)
    {
       png_write_tIME(png_ptr, &(info_ptr->mod_time));
       png_ptr->mode |= PNG_WROTE_tIME;
    }
    if (info_ptr->valid & PNG_INFO_tIME)
    {
       png_write_tIME(png_ptr, &(info_ptr->mod_time));
       png_ptr->mode |= PNG_WROTE_tIME;
    }

-#endif
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
+#endif /* tIME */
+
+#ifdef PNG_WRITE_sPLT_SUPPORTED

    if (info_ptr->valid & PNG_INFO_sPLT)
      for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
        png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
    if (info_ptr->valid & PNG_INFO_sPLT)
      for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
        png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);

-#endif
-#if defined(PNG_WRITE_TEXT_SUPPORTED)
+#endif /* sPLT */
+
+#ifdef PNG_WRITE_TEXT_SUPPORTED

    /* Check to see if we need to write text chunks */
    for (i = 0; i < info_ptr->num_text; i++)
    {
    /* Check to see if we need to write text chunks */
    for (i = 0; i < info_ptr->num_text; i++)
    {

-      png_debug2(2, "Writing header text chunk %d, type %d\n", i,
+      png_debug2(2, "Writing header text chunk %d, type %d", i,

          info_ptr->text[i].compression);
          info_ptr->text[i].compression);

-      /* an internationalized chunk? */
+      /* An internationalized chunk? */

       if (info_ptr->text[i].compression > 0)
       {
       if (info_ptr->text[i].compression > 0)
       {

-#if defined(PNG_WRITE_iTXt_SUPPORTED)
-          /* write international chunk */
+#ifdef PNG_WRITE_iTXt_SUPPORTED
+          /* Write international chunk */

           png_write_iTXt(png_ptr,
                          info_ptr->text[i].compression,
                          info_ptr->text[i].key,
           png_write_iTXt(png_ptr,
                          info_ptr->text[i].compression,
                          info_ptr->text[i].key,


@@ -222,7 +244,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
                          info_ptr->text[i].lang_key,
                          info_ptr->text[i].text);
 #else
                          info_ptr->text[i].lang_key,
                          info_ptr->text[i].text);
 #else

-          png_warning(png_ptr, "Unable to write international text\n");
+          png_warning(png_ptr, "Unable to write international text");

 #endif
           /* Mark this chunk as written */
           info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
 #endif
           /* Mark this chunk as written */
           info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;


@@ -230,44 +252,46 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
       /* If we want a compressed text chunk */
       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
       {
       /* If we want a compressed text chunk */
       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
       {

-#if defined(PNG_WRITE_zTXt_SUPPORTED)
-         /* write compressed chunk */
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+         /* Write compressed chunk */

          png_write_zTXt(png_ptr, info_ptr->text[i].key,
             info_ptr->text[i].text, 0,
             info_ptr->text[i].compression);
 #else
          png_write_zTXt(png_ptr, info_ptr->text[i].key,
             info_ptr->text[i].text, 0,
             info_ptr->text[i].compression);
 #else

-         png_warning(png_ptr, "Unable to write compressed text\n");
+         png_warning(png_ptr, "Unable to write compressed text");

 #endif
          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
       }
       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
       {
 #endif
          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
       }
       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
       {

-#if defined(PNG_WRITE_tEXt_SUPPORTED)
-         /* write uncompressed chunk */
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+         /* Write uncompressed chunk */

          png_write_tEXt(png_ptr, info_ptr->text[i].key,
                          info_ptr->text[i].text,
                          0);
          png_write_tEXt(png_ptr, info_ptr->text[i].key,
                          info_ptr->text[i].text,
                          0);

-#else
-         png_warning(png_ptr, "Unable to write uncompressed text\n");
-#endif

          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;

+#else
+         /* Can't get here */
+         png_warning(png_ptr, "Unable to write uncompressed text");
+#endif

       }
    }
       }
    }

-#endif
-#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+#endif /* tEXt */
+
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED

    if (info_ptr->unknown_chunks_num)
    {
    if (info_ptr->unknown_chunks_num)
    {

-       png_unknown_chunk *up;
+      png_unknown_chunk *up;

 
 

-       png_debug(5, "writing extra chunks\n");
+      png_debug(5, "writing extra chunks");

 
 

-       for (up = info_ptr->unknown_chunks;
-            up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
-            up++)
-       {
-         int keep=png_handle_as_unknown(png_ptr, up->name);
+      for (up = info_ptr->unknown_chunks;
+           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+           up++)
+      {
+         int keep = png_handle_as_unknown(png_ptr, up->name);

          if (keep != PNG_HANDLE_CHUNK_NEVER &&
             up->location && (up->location & PNG_HAVE_PLTE) &&
             !(up->location & PNG_HAVE_IDAT) &&
          if (keep != PNG_HANDLE_CHUNK_NEVER &&
             up->location && (up->location & PNG_HAVE_PLTE) &&
             !(up->location & PNG_HAVE_IDAT) &&


@@ -276,7 +300,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
          {
             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }
          {
             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }

-       }
+      }

    }
 #endif
 }
    }
 #endif
 }


@@ -289,66 +313,69 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
 void PNGAPI
 png_write_end(png_structp png_ptr, png_infop info_ptr)
 {
 void PNGAPI
 png_write_end(png_structp png_ptr, png_infop info_ptr)
 {

-   png_debug(1, "in png_write_end\n");
+   png_debug(1, "in png_write_end");
+
+   if (png_ptr == NULL)
+      return;

    if (!(png_ptr->mode & PNG_HAVE_IDAT))
       png_error(png_ptr, "No IDATs written into file");
 
    if (!(png_ptr->mode & PNG_HAVE_IDAT))
       png_error(png_ptr, "No IDATs written into file");
 

-   /* see if user wants us to write information chunks */
+   /* See if user wants us to write information chunks */

    if (info_ptr != NULL)
    {
    if (info_ptr != NULL)
    {

-#if defined(PNG_WRITE_TEXT_SUPPORTED)
+#ifdef PNG_WRITE_TEXT_SUPPORTED

       int i; /* local index variable */
 #endif
       int i; /* local index variable */
 #endif

-#if defined(PNG_WRITE_tIME_SUPPORTED)
-      /* check to see if user has supplied a time chunk */
+#ifdef PNG_WRITE_tIME_SUPPORTED
+      /* Check to see if user has supplied a time chunk */

       if ((info_ptr->valid & PNG_INFO_tIME) &&
          !(png_ptr->mode & PNG_WROTE_tIME))
          png_write_tIME(png_ptr, &(info_ptr->mod_time));
 #endif
       if ((info_ptr->valid & PNG_INFO_tIME) &&
          !(png_ptr->mode & PNG_WROTE_tIME))
          png_write_tIME(png_ptr, &(info_ptr->mod_time));
 #endif

-#if defined(PNG_WRITE_TEXT_SUPPORTED)
-      /* loop through comment chunks */
+#ifdef PNG_WRITE_TEXT_SUPPORTED
+      /* Loop through comment chunks */

       for (i = 0; i < info_ptr->num_text; i++)
       {
       for (i = 0; i < info_ptr->num_text; i++)
       {

-         png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
+         png_debug2(2, "Writing trailer text chunk %d, type %d", i,

             info_ptr->text[i].compression);
             info_ptr->text[i].compression);

-         /* an internationalized chunk? */
+         /* An internationalized chunk? */

          if (info_ptr->text[i].compression > 0)
          {
          if (info_ptr->text[i].compression > 0)
          {

-#if defined(PNG_WRITE_iTXt_SUPPORTED)
-             /* write international chunk */
-             png_write_iTXt(png_ptr,
-                         info_ptr->text[i].compression,
-                         info_ptr->text[i].key,
-                         info_ptr->text[i].lang,
-                         info_ptr->text[i].lang_key,
-                         info_ptr->text[i].text);
+#ifdef PNG_WRITE_iTXt_SUPPORTED
+            /* Write international chunk */
+            png_write_iTXt(png_ptr,
+                        info_ptr->text[i].compression,
+                        info_ptr->text[i].key,
+                        info_ptr->text[i].lang,
+                        info_ptr->text[i].lang_key,
+                        info_ptr->text[i].text);

 #else
 #else

-             png_warning(png_ptr, "Unable to write international text\n");
+            png_warning(png_ptr, "Unable to write international text");

 #endif
 #endif

-             /* Mark this chunk as written */
-             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+            /* Mark this chunk as written */
+            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;

          }
          else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
          {
          }
          else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
          {

-#if defined(PNG_WRITE_zTXt_SUPPORTED)
-            /* write compressed chunk */
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+            /* Write compressed chunk */

             png_write_zTXt(png_ptr, info_ptr->text[i].key,
                info_ptr->text[i].text, 0,
                info_ptr->text[i].compression);
 #else
             png_write_zTXt(png_ptr, info_ptr->text[i].key,
                info_ptr->text[i].text, 0,
                info_ptr->text[i].compression);
 #else

-            png_warning(png_ptr, "Unable to write compressed text\n");
+            png_warning(png_ptr, "Unable to write compressed text");

 #endif
             /* Mark this chunk as written */
             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
          }
          else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
          {
 #endif
             /* Mark this chunk as written */
             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
          }
          else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
          {

-#if defined(PNG_WRITE_tEXt_SUPPORTED)
-            /* write uncompressed chunk */
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+            /* Write uncompressed chunk */

             png_write_tEXt(png_ptr, info_ptr->text[i].key,
                info_ptr->text[i].text, 0);
 #else
             png_write_tEXt(png_ptr, info_ptr->text[i].key,
                info_ptr->text[i].text, 0);
 #else

-            png_warning(png_ptr, "Unable to write uncompressed text\n");
+            png_warning(png_ptr, "Unable to write uncompressed text");

 #endif
 
             /* Mark this chunk as written */
 #endif
 
             /* Mark this chunk as written */


@@ -356,18 +383,18 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
          }
       }
 #endif
          }
       }
 #endif

-#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED

    if (info_ptr->unknown_chunks_num)
    {
    if (info_ptr->unknown_chunks_num)
    {

-       png_unknown_chunk *up;
+      png_unknown_chunk *up;

 
 

-       png_debug(5, "writing extra chunks\n");
+      png_debug(5, "writing extra chunks");

 
 

-       for (up = info_ptr->unknown_chunks;
-            up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
-            up++)
-       {
-         int keep=png_handle_as_unknown(png_ptr, up->name);
+      for (up = info_ptr->unknown_chunks;
+           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+           up++)
+      {
+         int keep = png_handle_as_unknown(png_ptr, up->name);

          if (keep != PNG_HANDLE_CHUNK_NEVER &&
             up->location && (up->location & PNG_AFTER_IDAT) &&
             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
          if (keep != PNG_HANDLE_CHUNK_NEVER &&
             up->location && (up->location & PNG_AFTER_IDAT) &&
             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||


@@ -375,29 +402,36 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
          {
             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }
          {
             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }

-       }
+      }

    }
 #endif
    }
 
    png_ptr->mode |= PNG_AFTER_IDAT;
 
    }
 #endif
    }
 
    png_ptr->mode |= PNG_AFTER_IDAT;
 

-   /* write end of PNG file */
+   /* Write end of PNG file */

    png_write_IEND(png_ptr);
    png_write_IEND(png_ptr);

-#if 0
-/* This flush, added in libpng-1.0.8,  causes some applications to crash
-   because they do not set png_ptr->output_flush_fn */
+   /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
+    * and restored again in libpng-1.2.30, may cause some applications that
+    * do not set png_ptr->output_flush_fn to crash.  If your application
+    * experiences a problem, please try building libpng with
+    * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
+    * png-mng-implement at lists.sf.net .
+    */
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+#  ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED

    png_flush(png_ptr);
    png_flush(png_ptr);

+#  endif

 #endif
 }
 
 #endif
 }
 

-#if defined(PNG_WRITE_tIME_SUPPORTED)
-#if !defined(_WIN32_WCE)
-/* "time.h" functions are not supported on WindowsCE */
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+/* "tm" structure is not supported on WindowsCE */

 void PNGAPI
 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
 {
 void PNGAPI
 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
 {

-   png_debug(1, "in png_convert_from_struct_tm\n");
+   png_debug(1, "in png_convert_from_struct_tm");
+

    ptime->year = (png_uint_16)(1900 + ttime->tm_year);
    ptime->month = (png_byte)(ttime->tm_mon + 1);
    ptime->day = (png_byte)ttime->tm_mday;
    ptime->year = (png_uint_16)(1900 + ttime->tm_year);
    ptime->month = (png_byte)(ttime->tm_mon + 1);
    ptime->day = (png_byte)ttime->tm_mday;


@@ -411,12 +445,12 @@ png_convert_from_time_t(png_timep ptime, time_t ttime)
 {
    struct tm *tbuf;
 
 {
    struct tm *tbuf;
 

-   png_debug(1, "in png_convert_from_time_t\n");
+   png_debug(1, "in png_convert_from_time_t");
+

    tbuf = gmtime(&ttime);
    png_convert_from_struct_tm(ptime, tbuf);
 }
 #endif
    tbuf = gmtime(&ttime);
    png_convert_from_struct_tm(ptime, tbuf);
 }
 #endif

-#endif

 
 /* Initialize png_ptr structure, and allocate any memory needed */
 png_structp PNGAPI
 
 /* Initialize png_ptr structure, and allocate any memory needed */
 png_structp PNGAPI


@@ -425,7 +459,7 @@ png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 {
 #ifdef PNG_USER_MEM_SUPPORTED
    return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
 {
 #ifdef PNG_USER_MEM_SUPPORTED
    return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,

-      warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
+      warn_fn, NULL, NULL, NULL));

 }
 
 /* Alternate initialize png_ptr structure, and allocate any memory needed */
 }
 
 /* Alternate initialize png_ptr structure, and allocate any memory needed */


@@ -435,6 +469,10 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_malloc_ptr malloc_fn, png_free_ptr free_fn)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_malloc_ptr malloc_fn, png_free_ptr free_fn)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */

+   volatile int png_cleanup_needed = 0;
+#ifdef PNG_SETJMP_SUPPORTED
+   volatile
+#endif

    png_structp png_ptr;
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
    png_structp png_ptr;
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD


@@ -442,7 +480,9 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif
 #endif
    int i;
 #endif
 #endif
    int i;

-   png_debug(1, "in png_create_write_struct\n");
+
+   png_debug(1, "in png_create_write_struct");
+

 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
       (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
       (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);


@@ -452,33 +492,25 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    if (png_ptr == NULL)
       return (NULL);
 
    if (png_ptr == NULL)
       return (NULL);
 

-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
-
-   /* added at libpng-1.2.6 */
+   /* Added at libpng-1.2.6 */

 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED

-   png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
-   png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
+   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;

 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED

+/* Applications that neglect to set up their own setjmp() and then
+   encounter a png_error() will longjmp here.  Since the jmpbuf is
+   then meaningless we abort instead of returning. */

 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
 #else
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
 #else

-   if (setjmp(png_ptr->jmpbuf))
+   if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */

 #endif
 #endif

-   {
-      png_free(png_ptr, png_ptr->zbuf);
-      png_ptr->zbuf=NULL;
-      png_destroy_struct(png_ptr);
-      return (NULL);
-   }

 #ifdef USE_FAR_KEYWORD
 #ifdef USE_FAR_KEYWORD

-   png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(png_ptr), jmpbuf, png_sizeof(jmp_buf));

 #endif
 #endif

+      PNG_ABORT();

 #endif
 
 #ifdef PNG_USER_MEM_SUPPORTED
 #endif
 
 #ifdef PNG_USER_MEM_SUPPORTED


@@ -486,12 +518,15 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 

-   i=0;
-   do
+   if (user_png_ver)

    {
    {

-     if(user_png_ver[i] != png_libpng_ver[i])
-        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-   } while (png_libpng_ver[i++]);
+      i = 0;
+      do
+      {
+         if (user_png_ver[i] != png_libpng_ver[i])
+            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+      } while (png_libpng_ver[i++]);
+   }

 
    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
    {
 
    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
    {


@@ -504,180 +539,63 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
      {
          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
      {

-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+#ifdef PNG_STDIO_SUPPORTED

         char msg[80];
         if (user_png_ver)
         {
         char msg[80];
         if (user_png_ver)
         {

-          sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
-             user_png_ver);
-          png_warning(png_ptr, msg);
+           png_snprintf(msg, 80,
+              "Application was compiled with png.h from libpng-%.20s",
+              user_png_ver);
+           png_warning(png_ptr, msg);

         }
         }

-        sprintf(msg, "Application  is  running with png.c from libpng-%.20s",
+        png_snprintf(msg, 80,
+           "Application  is  running with png.c from libpng-%.20s",

            png_libpng_ver);
         png_warning(png_ptr, msg);
 #endif
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
            png_libpng_ver);
         png_warning(png_ptr, msg);
 #endif
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED

-        png_ptr->flags=0;
+        png_ptr->flags = 0;

 #endif
 #endif

-        png_error(png_ptr,
+        png_warning(png_ptr,

            "Incompatible libpng version in application and library");
            "Incompatible libpng version in application and library");

+        png_cleanup_needed = 1;

      }
    }
 
      }
    }
 

-   /* initialize zbuf - compression buffer */
+   /* Initialize zbuf - compression buffer */

    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;

-   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
-      (png_uint_32)png_ptr->zbuf_size);
-
-   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
-      png_flush_ptr_NULL);
-
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
-   png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
-      1, png_doublep_NULL, png_doublep_NULL);
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-/* Applications that neglect to set up their own setjmp() and then encounter
-   a png_error() will longjmp here.  Since the jmpbuf is then meaningless we
-   abort instead of returning. */
-#ifdef USE_FAR_KEYWORD
-   if (setjmp(jmpbuf))
-      PNG_ABORT();
-   png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
-#else
-   if (setjmp(png_ptr->jmpbuf))
-      PNG_ABORT();
-#endif
-#endif
-   return (png_ptr);
-}
-
-/* Initialize png_ptr structure, and allocate any memory needed */
-#undef png_write_init
-void PNGAPI
-png_write_init(png_structp png_ptr)
-{
-   /* We only come here via pre-1.0.7-compiled applications */
-   png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
-}
-
-void PNGAPI
-png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
-   png_size_t png_struct_size, png_size_t png_info_size)
-{
-   /* We only come here via pre-1.0.12-compiled applications */
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
-   if(png_sizeof(png_struct) > png_struct_size ||
-      png_sizeof(png_info) > png_info_size)
+   if (!png_cleanup_needed)

    {
    {

-      char msg[80];
-      png_ptr->warning_fn=NULL;
-      if (user_png_ver)
-      {
-        sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
-           user_png_ver);
-        png_warning(png_ptr, msg);
-      }
-      sprintf(msg, "Application  is  running with png.c from libpng-%.20s",
-         png_libpng_ver);
-      png_warning(png_ptr, msg);
+      png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr,
+         png_ptr->zbuf_size);
+      if (png_ptr->zbuf == NULL)
+         png_cleanup_needed = 1;

    }
    }

-#endif
-   if(png_sizeof(png_struct) > png_struct_size)
-     {
-       png_ptr->error_fn=NULL;
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-       png_ptr->flags=0;
-#endif
-       png_error(png_ptr,
-       "The png struct allocated by the application for writing is too small.");
-     }
-   if(png_sizeof(png_info) > png_info_size)
-     {
-       png_ptr->error_fn=NULL;
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-       png_ptr->flags=0;
-#endif
-       png_error(png_ptr,
-       "The info struct allocated by the application for writing is too small.");
-     }
-   png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
-}
-
-
-void PNGAPI
-png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
-   png_size_t png_struct_size)
-{
-   png_structp png_ptr=*ptr_ptr;
-#ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf tmp_jmp; /* to save current jump buffer */
-#endif
-   int i = 0;
-   do
+   if (png_cleanup_needed)

    {
    {

-     if (user_png_ver[i] != png_libpng_ver[i])
-     {
-#ifdef PNG_LEGACY_SUPPORTED
-       png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+       /* Clean up PNG structure and deallocate any memory. */
+       png_free(png_ptr, png_ptr->zbuf);
+       png_ptr->zbuf = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+       png_destroy_struct_2((png_voidp)png_ptr,
+          (png_free_ptr)free_fn, (png_voidp)mem_ptr);

 #else
 #else

-       png_ptr->warning_fn=NULL;
-       png_warning(png_ptr,
-     "Application uses deprecated png_write_init() and should be recompiled.");
-       break;
-#endif
-     }
-   } while (png_libpng_ver[i++]);
-
-   png_debug(1, "in png_write_init_3\n");
-
-#ifdef PNG_SETJMP_SUPPORTED
-   /* save jump buffer and error functions */
-   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+       png_destroy_struct((png_voidp)png_ptr);

 #endif
 #endif

+       return (NULL);
+   }

 
 

-   if (png_sizeof(png_struct) > png_struct_size)
-     {
-       png_destroy_struct(png_ptr);
-       png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
-       *ptr_ptr = png_ptr;
-     }
-
-   /* reset all variables to 0 */
-   png_memset(png_ptr, 0, png_sizeof (png_struct));
-
-   /* added at libpng-1.2.6 */
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
-   png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
-#endif
-
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
-
-#ifdef PNG_SETJMP_SUPPORTED
-   /* restore jump buffer */
-   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
-#endif
-
-   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
-      png_flush_ptr_NULL);
-
-   /* initialize zbuf - compression buffer */
-   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
-      (png_uint_32)png_ptr->zbuf_size);
+   png_set_write_fn(png_ptr, NULL, NULL, NULL);

 
 

-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED

    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,

-      1, png_doublep_NULL, png_doublep_NULL);
+      1, NULL, NULL);

 #endif
 #endif

+
+   return (png_ptr);

 }
 
 }
 

+

 /* Write a few rows of image data.  If the image is interlaced,
  * either you will have to write the 7 sub images, or, if you
  * have called png_set_interlace_handling(), you will have to
 /* Write a few rows of image data.  If the image is interlaced,
  * either you will have to write the 7 sub images, or, if you
  * have called png_set_interlace_handling(), you will have to


@@ -690,8 +608,12 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
    png_uint_32 i; /* row counter */
    png_bytepp rp; /* row pointer */
 
    png_uint_32 i; /* row counter */
    png_bytepp rp; /* row pointer */
 

-   png_debug(1, "in png_write_rows\n");
-   /* loop through the rows */
+   png_debug(1, "in png_write_rows");
+
+   if (png_ptr == NULL)
+      return;
+
+   /* Loop through the rows */

    for (i = 0, rp = row; i < num_rows; i++, rp++)
    {
       png_write_row(png_ptr, *rp);
    for (i = 0, rp = row; i < num_rows; i++, rp++)
    {
       png_write_row(png_ptr, *rp);


@@ -708,18 +630,23 @@ png_write_image(png_structp png_ptr, png_bytepp image)
    int pass, num_pass; /* pass variables */
    png_bytepp rp; /* points to current row */
 
    int pass, num_pass; /* pass variables */
    png_bytepp rp; /* points to current row */
 

-   png_debug(1, "in png_write_image\n");
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-   /* intialize interlace handling.  If image is not interlaced,
-      this will set pass to 1 */
+   if (png_ptr == NULL)
+      return;
+
+   png_debug(1, "in png_write_image");
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* Initialize interlace handling.  If image is not interlaced,
+    * this will set pass to 1
+    */

    num_pass = png_set_interlace_handling(png_ptr);
 #else
    num_pass = 1;
 #endif
    num_pass = png_set_interlace_handling(png_ptr);
 #else
    num_pass = 1;
 #endif

-   /* loop through passes */
+   /* Loop through passes */

    for (pass = 0; pass < num_pass; pass++)
    {
    for (pass = 0; pass < num_pass; pass++)
    {

-      /* loop through image */
+      /* Loop through image */

       for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
       {
          png_write_row(png_ptr, *rp);
       for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
       {
          png_write_row(png_ptr, *rp);


@@ -727,55 +654,61 @@ png_write_image(png_structp png_ptr, png_bytepp image)
    }
 }
 
    }
 }
 

-/* called by user to write a row of image data */
+/* Called by user to write a row of image data */

 void PNGAPI
 png_write_row(png_structp png_ptr, png_bytep row)
 {
 void PNGAPI
 png_write_row(png_structp png_ptr, png_bytep row)
 {

-   png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
+   if (png_ptr == NULL)
+      return;
+
+   png_debug2(1, "in png_write_row (row %ld, pass %d)",

       png_ptr->row_number, png_ptr->pass);
       png_ptr->row_number, png_ptr->pass);

-   /* initialize transformations and other stuff if first time */
+
+   /* Initialize transformations and other stuff if first time */

    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {

-   /* make sure we wrote the header info */
-   if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
-      png_error(png_ptr,
-         "png_write_info was never called before png_write_row.");
+      /* Make sure we wrote the header info */
+      if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+         png_error(png_ptr,
+            "png_write_info was never called before png_write_row");

 
 

-   /* check for transforms that have been set but were defined out */
+      /* Check for transforms that have been set but were defined out */

 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)

-   if (png_ptr->transformations & PNG_INVERT_MONO)
-      png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_INVERT_MONO)
+         png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined");

 #endif
 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
 #endif
 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)

-   if (png_ptr->transformations & PNG_FILLER)
-      png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_FILLER)
+         png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined");

 #endif
 #endif

-#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
-   if (png_ptr->transformations & PNG_PACKSWAP)
-      png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
+#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
+    defined(PNG_READ_PACKSWAP_SUPPORTED)
+      if (png_ptr->transformations & PNG_PACKSWAP)
+         png_warning(png_ptr,
+             "PNG_WRITE_PACKSWAP_SUPPORTED is not defined");

 #endif
 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
 #endif
 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)

-   if (png_ptr->transformations & PNG_PACK)
-      png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_PACK)
+         png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined");

 #endif
 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
 #endif
 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)

-   if (png_ptr->transformations & PNG_SHIFT)
-      png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_SHIFT)
+         png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined");

 #endif
 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
 #endif
 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)

-   if (png_ptr->transformations & PNG_BGR)
-      png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_BGR)
+         png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined");

 #endif
 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
 #endif
 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)

-   if (png_ptr->transformations & PNG_SWAP_BYTES)
-      png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_SWAP_BYTES)
+         png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined");

 #endif
 
       png_write_start_row(png_ptr);
    }
 
 #endif
 
       png_write_start_row(png_ptr);
    }
 

-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-   /* if interlaced and not interested in row, return */
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* If interlaced and not interested in row, return */

    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
       switch (png_ptr->pass)
    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
       switch (png_ptr->pass)


@@ -833,7 +766,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
    }
 #endif
 
    }
 #endif
 

-   /* set up row info for transformations */
+   /* Set up row info for transformations */

    png_ptr->row_info.color_type = png_ptr->color_type;
    png_ptr->row_info.width = png_ptr->usr_width;
    png_ptr->row_info.channels = png_ptr->usr_channels;
    png_ptr->row_info.color_type = png_ptr->color_type;
    png_ptr->row_info.width = png_ptr->usr_width;
    png_ptr->row_info.channels = png_ptr->usr_channels;


@@ -844,25 +777,24 @@ png_write_row(png_structp png_ptr, png_bytep row)
    png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
       png_ptr->row_info.width);
 
    png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
       png_ptr->row_info.width);
 

-   png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
-   png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
-   png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
-   png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
-   png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
-   png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
+   png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
+   png_debug1(3, "row_info->width = %lu", png_ptr->row_info.width);
+   png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
+   png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
+   png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
+   png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes);

 
    /* Copy user's row into buffer, leaving room for filter byte. */
 
    /* Copy user's row into buffer, leaving room for filter byte. */

-   png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
-      png_ptr->row_info.rowbytes);
+   png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);

 
 

-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-   /* handle interlacing */
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+   /* Handle interlacing */

    if (png_ptr->interlaced && png_ptr->pass < 6 &&
       (png_ptr->transformations & PNG_INTERLACE))
    {
       png_do_write_interlace(&(png_ptr->row_info),
          png_ptr->row_buf + 1, png_ptr->pass);
    if (png_ptr->interlaced && png_ptr->pass < 6 &&
       (png_ptr->transformations & PNG_INTERLACE))
    {
       png_do_write_interlace(&(png_ptr->row_info),
          png_ptr->row_buf + 1, png_ptr->pass);

-      /* this should always get caught above, but still ... */
+      /* This should always get caught above, but still ... */

       if (!(png_ptr->row_info.width))
       {
          png_write_finish_row(png_ptr);
       if (!(png_ptr->row_info.width))
       {
          png_write_finish_row(png_ptr);


@@ -871,11 +803,11 @@ png_write_row(png_structp png_ptr, png_bytep row)
    }
 #endif
 
    }
 #endif
 

-   /* handle other transformations */
+   /* Handle other transformations */

    if (png_ptr->transformations)
       png_do_write_transformations(png_ptr);
 
    if (png_ptr->transformations)
       png_do_write_transformations(png_ptr);
 

-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+#ifdef PNG_MNG_FEATURES_SUPPORTED

    /* Write filter_method 64 (intrapixel differencing) only if
     * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
     * 2. Libpng did not write a PNG signature (this filter_method is only
    /* Write filter_method 64 (intrapixel differencing) only if
     * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
     * 2. Libpng did not write a PNG signature (this filter_method is only


@@ -885,7 +817,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
     * 4. The filter_method is 64 and
     * 5. The color_type is RGB or RGBA
     */
     * 4. The filter_method is 64 and
     * 5. The color_type is RGB or RGBA
     */

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

       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
    {
       /* Intrapixel differencing */
       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
    {
       /* Intrapixel differencing */


@@ -900,35 +832,41 @@ png_write_row(png_structp png_ptr, png_bytep row)
       (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
 
       (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
 

-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#ifdef PNG_WRITE_FLUSH_SUPPORTED

 /* Set the automatic flush interval or 0 to turn flushing off */
 void PNGAPI
 png_set_flush(png_structp png_ptr, int nrows)
 {
 /* Set the automatic flush interval or 0 to turn flushing off */
 void PNGAPI
 png_set_flush(png_structp png_ptr, int nrows)
 {

-   png_debug(1, "in png_set_flush\n");
+   png_debug(1, "in png_set_flush");
+
+   if (png_ptr == NULL)
+      return;

    png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
 }
 
    png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
 }
 

-/* flush the current output buffers now */
+/* Flush the current output buffers now */

 void PNGAPI
 png_write_flush(png_structp png_ptr)
 {
    int wrote_IDAT;
 
 void PNGAPI
 png_write_flush(png_structp png_ptr)
 {
    int wrote_IDAT;
 

-   png_debug(1, "in png_write_flush\n");
+   png_debug(1, "in png_write_flush");
+
+   if (png_ptr == NULL)
+      return;

    /* We have already written out all of the data */
    if (png_ptr->row_number >= png_ptr->num_rows)
    /* We have already written out all of the data */
    if (png_ptr->row_number >= png_ptr->num_rows)

-     return;
+      return;

 
    do
    {
       int ret;
 
 
    do
    {
       int ret;
 

-      /* compress the data */
+      /* Compress the data */

       ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
       wrote_IDAT = 0;
 
       ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
       wrote_IDAT = 0;
 

-      /* check for compression errors */
+      /* Check for compression errors */

       if (ret != Z_OK)
       {
          if (png_ptr->zstream.msg != NULL)
       if (ret != Z_OK)
       {
          if (png_ptr->zstream.msg != NULL)


@@ -939,7 +877,7 @@ png_write_flush(png_structp png_ptr)
 
       if (!(png_ptr->zstream.avail_out))
       {
 
       if (!(png_ptr->zstream.avail_out))
       {

-         /* write the IDAT and reset the zlib output buffer */
+         /* Write the IDAT and reset the zlib output buffer */

          png_write_IDAT(png_ptr, png_ptr->zbuf,
                         png_ptr->zbuf_size);
          png_ptr->zstream.next_out = png_ptr->zbuf;
          png_write_IDAT(png_ptr, png_ptr->zbuf,
                         png_ptr->zbuf_size);
          png_ptr->zstream.next_out = png_ptr->zbuf;


@@ -951,7 +889,7 @@ png_write_flush(png_structp png_ptr)
    /* If there is any data left to be output, write it into a new IDAT */
    if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
    {
    /* If there is any data left to be output, write it into a new IDAT */
    if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
    {

-      /* write the IDAT and reset the zlib output buffer */
+      /* Write the IDAT and reset the zlib output buffer */

       png_write_IDAT(png_ptr, png_ptr->zbuf,
                      png_ptr->zbuf_size - png_ptr->zstream.avail_out);
       png_ptr->zstream.next_out = png_ptr->zbuf;
       png_write_IDAT(png_ptr, png_ptr->zbuf,
                      png_ptr->zbuf_size - png_ptr->zstream.avail_out);
       png_ptr->zstream.next_out = png_ptr->zbuf;


@@ -962,7 +900,7 @@ png_write_flush(png_structp png_ptr)
 }
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 
 }
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 

-/* free all memory used by the write */
+/* Free all memory used by the write */

 void PNGAPI
 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 {
 void PNGAPI
 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 {


@@ -973,7 +911,8 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
    png_voidp mem_ptr = NULL;
 #endif
 
    png_voidp mem_ptr = NULL;
 #endif
 

-   png_debug(1, "in png_destroy_write_struct\n");
+   png_debug(1, "in png_destroy_write_struct");
+

    if (png_ptr_ptr != NULL)
    {
       png_ptr = *png_ptr_ptr;
    if (png_ptr_ptr != NULL)
    {
       png_ptr = *png_ptr_ptr;


@@ -983,21 +922,31 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 #endif
    }
 
 #endif
    }
 

+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr != NULL)
+   {
+      free_fn = png_ptr->free_fn;
+      mem_ptr = png_ptr->mem_ptr;
+   }
+#endif
+

    if (info_ptr_ptr != NULL)
       info_ptr = *info_ptr_ptr;
 
    if (info_ptr != NULL)
    {
    if (info_ptr_ptr != NULL)
       info_ptr = *info_ptr_ptr;
 
    if (info_ptr != NULL)
    {

-      png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-      if (png_ptr->num_chunk_list)
+      if (png_ptr != NULL)

       {
       {

-         png_free(png_ptr, png_ptr->chunk_list);
-         png_ptr->chunk_list=NULL;
-         png_ptr->num_chunk_list=0;
-      }
+        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+        if (png_ptr->num_chunk_list)
+        {
+           png_free(png_ptr, png_ptr->chunk_list);
+           png_ptr->num_chunk_list = 0;
+        }

 #endif
 #endif

+      }

 
 #ifdef PNG_USER_MEM_SUPPORTED
       png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
 
 #ifdef PNG_USER_MEM_SUPPORTED
       png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,


@@ -1027,7 +976,7 @@ void /* PRIVATE */
 png_write_destroy(png_structp png_ptr)
 {
 #ifdef PNG_SETJMP_SUPPORTED
 png_write_destroy(png_structp png_ptr)
 {
 #ifdef PNG_SETJMP_SUPPORTED

-   jmp_buf tmp_jmp; /* save jump buffer */
+   jmp_buf tmp_jmp; /* Save jump buffer */

 #endif
    png_error_ptr error_fn;
    png_error_ptr warning_fn;
 #endif
    png_error_ptr error_fn;
    png_error_ptr warning_fn;


@@ -1036,24 +985,27 @@ png_write_destroy(png_structp png_ptr)
    png_free_ptr free_fn;
 #endif
 
    png_free_ptr free_fn;
 #endif
 

-   png_debug(1, "in png_write_destroy\n");
-   /* free any memory zlib uses */
+   png_debug(1, "in png_write_destroy");
+
+   /* Free any memory zlib uses */

    deflateEnd(&png_ptr->zstream);
 
    deflateEnd(&png_ptr->zstream);
 

-   /* free our memory.  png_free checks NULL for us. */
+   /* Free our memory.  png_free checks NULL for us. */

    png_free(png_ptr, png_ptr->zbuf);
    png_free(png_ptr, png_ptr->row_buf);
    png_free(png_ptr, png_ptr->zbuf);
    png_free(png_ptr, png_ptr->row_buf);

+#ifdef PNG_WRITE_FILTER_SUPPORTED

    png_free(png_ptr, png_ptr->prev_row);
    png_free(png_ptr, png_ptr->sub_row);
    png_free(png_ptr, png_ptr->up_row);
    png_free(png_ptr, png_ptr->avg_row);
    png_free(png_ptr, png_ptr->paeth_row);
    png_free(png_ptr, png_ptr->prev_row);
    png_free(png_ptr, png_ptr->sub_row);
    png_free(png_ptr, png_ptr->up_row);
    png_free(png_ptr, png_ptr->avg_row);
    png_free(png_ptr, png_ptr->paeth_row);

+#endif

 
 

-#if defined(PNG_TIME_RFC1123_SUPPORTED)
+#ifdef PNG_TIME_RFC1123_SUPPORTED

    png_free(png_ptr, png_ptr->time_buffer);
 #endif
 
    png_free(png_ptr, png_ptr->time_buffer);
 #endif
 

-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED

    png_free(png_ptr, png_ptr->prev_filters);
    png_free(png_ptr, png_ptr->filter_weights);
    png_free(png_ptr, png_ptr->inv_filter_weights);
    png_free(png_ptr, png_ptr->prev_filters);
    png_free(png_ptr, png_ptr->filter_weights);
    png_free(png_ptr, png_ptr->inv_filter_weights);


@@ -1062,8 +1014,8 @@ png_write_destroy(png_structp png_ptr)
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED

-   /* reset structure */
-   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+   /* Reset structure */
+   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));

 #endif
 
    error_fn = png_ptr->error_fn;
 #endif
 
    error_fn = png_ptr->error_fn;


@@ -1073,7 +1025,7 @@ png_write_destroy(png_structp png_ptr)
    free_fn = png_ptr->free_fn;
 #endif
 
    free_fn = png_ptr->free_fn;
 #endif
 

-   png_memset(png_ptr, 0, png_sizeof (png_struct));
+   png_memset(png_ptr, 0, png_sizeof(png_struct));

 
    png_ptr->error_fn = error_fn;
    png_ptr->warning_fn = warning_fn;
 
    png_ptr->error_fn = error_fn;
    png_ptr->warning_fn = warning_fn;


@@ -1083,7 +1035,7 @@ png_write_destroy(png_structp png_ptr)
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED

-   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));

 #endif
 }
 
 #endif
 }
 


@@ -1091,9 +1043,12 @@ png_write_destroy(png_structp png_ptr)
 void PNGAPI
 png_set_filter(png_structp png_ptr, int method, int filters)
 {
 void PNGAPI
 png_set_filter(png_structp png_ptr, int method, int filters)
 {

-   png_debug(1, "in png_set_filter\n");
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
-   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+   png_debug(1, "in png_set_filter");
+
+   if (png_ptr == NULL)
+      return;
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&

       (method == PNG_INTRAPIXEL_DIFFERENCING))
          method = PNG_FILTER_TYPE_BASE;
 #endif
       (method == PNG_INTRAPIXEL_DIFFERENCING))
          method = PNG_FILTER_TYPE_BASE;
 #endif


@@ -1101,15 +1056,26 @@ png_set_filter(png_structp png_ptr, int method, int filters)
    {
       switch (filters & (PNG_ALL_FILTERS | 0x07))
       {
    {
       switch (filters & (PNG_ALL_FILTERS | 0x07))
       {

+#ifdef PNG_WRITE_FILTER_SUPPORTED

          case 5:
          case 6:
          case 7: png_warning(png_ptr, "Unknown row filter for method 0");
          case 5:
          case 6:
          case 7: png_warning(png_ptr, "Unknown row filter for method 0");

-         case PNG_FILTER_VALUE_NONE:  png_ptr->do_filter=PNG_FILTER_NONE; break;
-         case PNG_FILTER_VALUE_SUB:   png_ptr->do_filter=PNG_FILTER_SUB;  break;
-         case PNG_FILTER_VALUE_UP:    png_ptr->do_filter=PNG_FILTER_UP;   break;
-         case PNG_FILTER_VALUE_AVG:   png_ptr->do_filter=PNG_FILTER_AVG;  break;
-         case PNG_FILTER_VALUE_PAETH: png_ptr->do_filter=PNG_FILTER_PAETH;break;
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+         case PNG_FILTER_VALUE_NONE:
+              png_ptr->do_filter = PNG_FILTER_NONE; break;
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+         case PNG_FILTER_VALUE_SUB:
+              png_ptr->do_filter = PNG_FILTER_SUB; break;
+         case PNG_FILTER_VALUE_UP:
+              png_ptr->do_filter = PNG_FILTER_UP; break;
+         case PNG_FILTER_VALUE_AVG:
+              png_ptr->do_filter = PNG_FILTER_AVG; break;
+         case PNG_FILTER_VALUE_PAETH:
+              png_ptr->do_filter = PNG_FILTER_PAETH; break;

          default: png_ptr->do_filter = (png_byte)filters; break;
          default: png_ptr->do_filter = (png_byte)filters; break;

+#else
+         default: png_warning(png_ptr, "Unknown row filter for method 0");
+#endif /* PNG_WRITE_FILTER_SUPPORTED */

       }
 
       /* If we have allocated the row_buf, this means we have already started
       }
 
       /* If we have allocated the row_buf, this means we have already started


@@ -1123,6 +1089,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
        */
       if (png_ptr->row_buf != NULL)
       {
        */
       if (png_ptr->row_buf != NULL)
       {

+#ifdef PNG_WRITE_FILTER_SUPPORTED

          if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
          {
             png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
          if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
          {
             png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,


@@ -1177,6 +1144,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
          }
 
          if (png_ptr->do_filter == PNG_NO_FILTERS)
          }
 
          if (png_ptr->do_filter == PNG_NO_FILTERS)

+#endif /* PNG_WRITE_FILTER_SUPPORTED */

             png_ptr->do_filter = PNG_FILTER_NONE;
       }
    }
             png_ptr->do_filter = PNG_FILTER_NONE;
       }
    }


@@ -1191,7 +1159,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
  * filtered data going to zlib more consistent, hopefully resulting in
  * better compression.
  */
  * filtered data going to zlib more consistent, hopefully resulting in
  * better compression.
  */

-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)      /* GRR 970116 */
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED      /* GRR 970116 */

 void PNGAPI
 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
    int num_weights, png_doublep filter_weights,
 void PNGAPI
 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
    int num_weights, png_doublep filter_weights,


@@ -1199,7 +1167,10 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 {
    int i;
 
 {
    int i;
 

-   png_debug(1, "in png_set_filter_heuristics\n");
+   png_debug(1, "in png_set_filter_heuristics");
+
+   if (png_ptr == NULL)
+      return;

    if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
    {
       png_warning(png_ptr, "Unknown filter heuristic method");
    if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
    {
       png_warning(png_ptr, "Unknown filter heuristic method");


@@ -1311,7 +1282,10 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 void PNGAPI
 png_set_compression_level(png_structp png_ptr, int level)
 {
 void PNGAPI
 png_set_compression_level(png_structp png_ptr, int level)
 {

-   png_debug(1, "in png_set_compression_level\n");
+   png_debug(1, "in png_set_compression_level");
+
+   if (png_ptr == NULL)
+      return;

    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
    png_ptr->zlib_level = level;
 }
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
    png_ptr->zlib_level = level;
 }


@@ -1319,7 +1293,10 @@ png_set_compression_level(png_structp png_ptr, int level)
 void PNGAPI
 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
 {
 void PNGAPI
 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
 {

-   png_debug(1, "in png_set_compression_mem_level\n");
+   png_debug(1, "in png_set_compression_mem_level");
+
+   if (png_ptr == NULL)
+      return;

    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
    png_ptr->zlib_mem_level = mem_level;
 }
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
    png_ptr->zlib_mem_level = mem_level;
 }


@@ -1327,7 +1304,10 @@ png_set_compression_mem_level(png_structp png_ptr, int mem_level)
 void PNGAPI
 png_set_compression_strategy(png_structp png_ptr, int strategy)
 {
 void PNGAPI
 png_set_compression_strategy(png_structp png_ptr, int strategy)
 {

-   png_debug(1, "in png_set_compression_strategy\n");
+   png_debug(1, "in png_set_compression_strategy");
+
+   if (png_ptr == NULL)
+      return;

    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
    png_ptr->zlib_strategy = strategy;
 }
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
    png_ptr->zlib_strategy = strategy;
 }


@@ -1335,16 +1315,18 @@ png_set_compression_strategy(png_structp png_ptr, int strategy)
 void PNGAPI
 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
 {
 void PNGAPI
 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
 {

+   if (png_ptr == NULL)
+      return;

    if (window_bits > 15)
       png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
    else if (window_bits < 8)
       png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
 #ifndef WBITS_8_OK
    if (window_bits > 15)
       png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
    else if (window_bits < 8)
       png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
 #ifndef WBITS_8_OK

-   /* avoid libpng bug with 256-byte windows */
+   /* Avoid libpng bug with 256-byte windows */

    if (window_bits == 8)
      {
        png_warning(png_ptr, "Compression window is being reset to 512");
    if (window_bits == 8)
      {
        png_warning(png_ptr, "Compression window is being reset to 512");

-       window_bits=9;
+       window_bits = 9;

      }
 #endif
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
      }
 #endif
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;


@@ -1354,7 +1336,10 @@ png_set_compression_window_bits(png_structp png_ptr, int window_bits)
 void PNGAPI
 png_set_compression_method(png_structp png_ptr, int method)
 {
 void PNGAPI
 png_set_compression_method(png_structp png_ptr, int method)
 {

-   png_debug(1, "in png_set_compression_method\n");
+   png_debug(1, "in png_set_compression_method");
+
+   if (png_ptr == NULL)
+      return;

    if (method != 8)
       png_warning(png_ptr, "Only compression method 8 is supported by PNG");
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
    if (method != 8)
       png_warning(png_ptr, "Only compression method 8 is supported by PNG");
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;


@@ -1364,101 +1349,109 @@ png_set_compression_method(png_structp png_ptr, int method)
 void PNGAPI
 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
 {
 void PNGAPI
 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
 {

+   if (png_ptr == NULL)
+      return;

    png_ptr->write_row_fn = write_row_fn;
 }
 
    png_ptr->write_row_fn = write_row_fn;
 }
 

-#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED

 void PNGAPI
 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    write_user_transform_fn)
 {
 void PNGAPI
 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    write_user_transform_fn)
 {

-   png_debug(1, "in png_set_write_user_transform_fn\n");
+   png_debug(1, "in png_set_write_user_transform_fn");
+
+   if (png_ptr == NULL)
+      return;

    png_ptr->transformations |= PNG_USER_TRANSFORM;
    png_ptr->write_user_transform_fn = write_user_transform_fn;
 }
 #endif
 
 
    png_ptr->transformations |= PNG_USER_TRANSFORM;
    png_ptr->write_user_transform_fn = write_user_transform_fn;
 }
 #endif
 
 

-#if defined(PNG_INFO_IMAGE_SUPPORTED)
+#ifdef PNG_INFO_IMAGE_SUPPORTED

 void PNGAPI
 png_write_png(png_structp png_ptr, png_infop info_ptr,
               int transforms, voidp params)
 {
 void PNGAPI
 png_write_png(png_structp png_ptr, png_infop info_ptr,
               int transforms, voidp params)
 {

-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-   /* invert the alpha channel from opacity to transparency */
-   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
-       png_set_invert_alpha(png_ptr);
-#endif
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;

 
    /* Write the file header information. */
    png_write_info(png_ptr, info_ptr);
 
    /* ------ these transformations don't touch the info structure ------- */
 
 
    /* Write the file header information. */
    png_write_info(png_ptr, info_ptr);
 
    /* ------ these transformations don't touch the info structure ------- */
 

-#if defined(PNG_WRITE_INVERT_SUPPORTED)
-   /* invert monochrome pixels */
+#ifdef PNG_WRITE_INVERT_SUPPORTED
+   /* Invert monochrome pixels */

    if (transforms & PNG_TRANSFORM_INVERT_MONO)
    if (transforms & PNG_TRANSFORM_INVERT_MONO)

-       png_set_invert_mono(png_ptr);
+      png_set_invert_mono(png_ptr);

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_SHIFT_SUPPORTED)
+#ifdef PNG_WRITE_SHIFT_SUPPORTED

    /* Shift the pixels up to a legal bit depth and fill in
     * as appropriate to correctly scale the image.
     */
    if ((transforms & PNG_TRANSFORM_SHIFT)
                && (info_ptr->valid & PNG_INFO_sBIT))
    /* Shift the pixels up to a legal bit depth and fill in
     * as appropriate to correctly scale the image.
     */
    if ((transforms & PNG_TRANSFORM_SHIFT)
                && (info_ptr->valid & PNG_INFO_sBIT))

-       png_set_shift(png_ptr, &info_ptr->sig_bit);
+      png_set_shift(png_ptr, &info_ptr->sig_bit);

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_PACK_SUPPORTED)
-   /* pack pixels into bytes */
+#ifdef PNG_WRITE_PACK_SUPPORTED
+   /* Pack pixels into bytes */

    if (transforms & PNG_TRANSFORM_PACKING)
        png_set_packing(png_ptr);
 #endif
 
    if (transforms & PNG_TRANSFORM_PACKING)
        png_set_packing(png_ptr);
 #endif
 

-#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-   /* swap location of alpha bytes from ARGB to RGBA */
+#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
+   /* Swap location of alpha bytes from ARGB to RGBA */

    if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
    if (transforms & PNG_TRANSFORM_SWAP_ALPHA)

-       png_set_swap_alpha(png_ptr);
+      png_set_swap_alpha(png_ptr);

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_FILLER_SUPPORTED)
-   /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
-    * RGB (4 channels -> 3 channels). The second parameter is not used.
-    */
-   if (transforms & PNG_TRANSFORM_STRIP_FILLER)
-       png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
+#ifdef PNG_WRITE_FILLER_SUPPORTED
+   /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
+   if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
+      png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
+   else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
+      png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_BGR_SUPPORTED)
-   /* flip BGR pixels to RGB */
+#ifdef PNG_WRITE_BGR_SUPPORTED
+   /* Flip BGR pixels to RGB */

    if (transforms & PNG_TRANSFORM_BGR)
    if (transforms & PNG_TRANSFORM_BGR)

-       png_set_bgr(png_ptr);
+      png_set_bgr(png_ptr);

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_SWAP_SUPPORTED)
-   /* swap bytes of 16-bit files to most significant byte first */
+#ifdef PNG_WRITE_SWAP_SUPPORTED
+   /* Swap bytes of 16-bit files to most significant byte first */

    if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
    if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)

-       png_set_swap(png_ptr);
+      png_set_swap(png_ptr);

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-   /* swap bits of 1, 2, 4 bit packed pixel formats */
+#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
+   /* Swap bits of 1, 2, 4 bit packed pixel formats */

    if (transforms & PNG_TRANSFORM_PACKSWAP)
    if (transforms & PNG_TRANSFORM_PACKSWAP)

-       png_set_packswap(png_ptr);
+      png_set_packswap(png_ptr);
+#endif
+
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+   /* Invert the alpha channel from opacity to transparency */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+      png_set_invert_alpha(png_ptr);

 #endif
 
    /* ----------------------- end of transformations ------------------- */
 
 #endif
 
    /* ----------------------- end of transformations ------------------- */
 

-   /* write the bits */
+   /* Write the bits */

    if (info_ptr->valid & PNG_INFO_IDAT)
        png_write_image(png_ptr, info_ptr->row_pointers);
 
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
 
    if (info_ptr->valid & PNG_INFO_IDAT)
        png_write_image(png_ptr, info_ptr->row_pointers);
 
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
 

-   if(transforms == 0 || params == NULL)
-      /* quiet compiler warnings */ return;
+   transforms = transforms; /* Quiet compiler warnings */
+   params = params;

 }
 #endif
 #endif /* PNG_WRITE_SUPPORTED */
 }
 #endif
 #endif /* PNG_WRITE_SUPPORTED */