Merge wxBitmapButton and wxButton panels in the xrc sample.

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

diff --git a/src/png/pngwrite.c b/src/png/pngwrite.c
index f422173bf2459fe2050ced5973833889dfc2e9ab..19dca1f04c86fbff8533154f87552f6f005cda11 100644 (file)
--- a/src/png/pngwrite.c
+++ b/src/png/pngwrite.c
@@ -1,9 +1,9 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
 
 /* pngwrite.c - general routines to write a PNG file
  *

- * libpng 1.2.7 - September 12, 2004
+ * Last changed in libpng 1.2.31 [August 19, 2008]

  * For conditions of distribution and use, see copyright notice in png.h
  * For conditions of distribution and use, see copyright notice in png.h

- * Copyright (c) 1998-2004 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.)
  */
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */


@@ -25,14 +25,16 @@
 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))
    {
    png_write_sig(png_ptr); /* write PNG signature */
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
    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))
+   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_warning(png_ptr, "MNG features are not allowed in a PNG datastream");

       png_ptr->mng_features_permitted=0;
    }
 #endif
       png_ptr->mng_features_permitted=0;
    }
 #endif


@@ -97,7 +99,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
    {
        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;
 
        for (up = info_ptr->unknown_chunks;
             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;


@@ -110,6 +112,8 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
             (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
          {
             ((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);
          }
        }


@@ -126,7 +130,10 @@ 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);
 


@@ -134,7 +141,7 @@ 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)
    if (info_ptr->valid & PNG_INFO_tRNS)
 
 #if defined(PNG_WRITE_tRNS_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_tRNS)


@@ -183,7 +190,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
           info_ptr->scal_s_width, info_ptr->scal_s_height);
 #else
       png_warning(png_ptr,
           info_ptr->scal_s_width, info_ptr->scal_s_height);
 #else
       png_warning(png_ptr,

-          "png_write_sCAL not supported; sCAL chunk not written.\n");
+          "png_write_sCAL not supported; sCAL chunk not written.");

 #endif
 #endif
 #endif
 #endif
 #endif
 #endif


@@ -208,7 +215,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
    /* 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);
       /* an internationalized chunk? */
       if (info_ptr->text[i].compression > 0)
          info_ptr->text[i].compression);
       /* an internationalized chunk? */
       if (info_ptr->text[i].compression > 0)


@@ -222,7 +229,7 @@ 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;


@@ -236,7 +243,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
             info_ptr->text[i].text, 0,
             info_ptr->text[i].compression);
 #else
             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;
 #endif
          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;


@@ -249,7 +256,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
                          info_ptr->text[i].text,
                          0);
 #else
                          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 */
          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;


@@ -261,7 +268,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
    {
        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;
 
        for (up = info_ptr->unknown_chunks;
             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;


@@ -289,7 +296,9 @@ 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");
 


@@ -309,7 +318,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
       /* loop through comment chunks */
       for (i = 0; i < info_ptr->num_text; i++)
       {
       /* loop through comment chunks */
       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);
          /* an internationalized chunk? */
          if (info_ptr->text[i].compression > 0)
             info_ptr->text[i].compression);
          /* an internationalized chunk? */
          if (info_ptr->text[i].compression > 0)


@@ -323,7 +332,7 @@ png_write_end(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;


@@ -336,7 +345,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
                info_ptr->text[i].text, 0,
                info_ptr->text[i].compression);
 #else
                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;
 #endif
             /* Mark this chunk as written */
             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;


@@ -348,7 +357,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
             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 */


@@ -361,7 +370,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
    {
        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;
 
        for (up = info_ptr->unknown_chunks;
             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;


@@ -384,9 +393,16 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 
    /* write end of PNG file */
    png_write_IEND(png_ptr);
 
    /* write end of PNG file */
    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 .  This kludge will be removed
+    * from libpng-1.4.0.
+    */
+#if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
+    defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)

    png_flush(png_ptr);
 #endif
 }
    png_flush(png_ptr);
 #endif
 }


@@ -397,7 +413,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 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;


@@ -411,7 +427,7 @@ 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);
 }
    tbuf = gmtime(&ttime);
    png_convert_from_struct_tm(ptime, tbuf);
 }


@@ -435,14 +451,17 @@ 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 */

-   png_structp png_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
+    volatile
+#endif
+    png_structp png_ptr;

 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
    jmp_buf jmpbuf;
 #endif
 #endif
    int i;
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
    jmp_buf jmpbuf;
 #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);


@@ -452,12 +471,6 @@ 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 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
    /* added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;


@@ -472,12 +485,12 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif
    {
       png_free(png_ptr, png_ptr->zbuf);
 #endif
    {
       png_free(png_ptr, png_ptr->zbuf);

-      png_ptr->zbuf=NULL;
+       png_ptr->zbuf=NULL;

       png_destroy_struct(png_ptr);
       return (NULL);
    }
 #ifdef USE_FAR_KEYWORD
       png_destroy_struct(png_ptr);
       return (NULL);
    }
 #ifdef USE_FAR_KEYWORD

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

 #endif
 #endif
 
 #endif
 #endif
 


@@ -486,12 +499,15 @@ 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)
    {


@@ -508,11 +524,13 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
         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",
+          png_snprintf(msg, 80,
+             "Application was compiled with png.h from libpng-%.20s",

              user_png_ver);
           png_warning(png_ptr, msg);
         }
              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
            png_libpng_ver);
         png_warning(png_ptr, msg);
 #endif


@@ -544,7 +562,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
       PNG_ABORT();
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
       PNG_ABORT();

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

 #else
    if (setjmp(png_ptr->jmpbuf))
       PNG_ABORT();
 #else
    if (setjmp(png_ptr->jmpbuf))
       PNG_ABORT();


@@ -554,6 +572,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 }
 
 /* Initialize png_ptr structure, and allocate any memory needed */
 }
 
 /* Initialize png_ptr structure, and allocate any memory needed */

+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Deprecated. */

 #undef png_write_init
 void PNGAPI
 png_write_init(png_structp png_ptr)
 #undef png_write_init
 void PNGAPI
 png_write_init(png_structp png_ptr)


@@ -567,24 +587,27 @@ 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 */
    png_size_t png_struct_size, png_size_t png_info_size)
 {
    /* We only come here via pre-1.0.12-compiled applications */

+   if (png_ptr == NULL) return;

 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)

-   if(png_sizeof(png_struct) > png_struct_size ||
+   if (png_sizeof(png_struct) > png_struct_size ||

       png_sizeof(png_info) > png_info_size)
    {
       char msg[80];
       png_ptr->warning_fn=NULL;
       if (user_png_ver)
       {
       png_sizeof(png_info) > png_info_size)
    {
       char msg[80];
       png_ptr->warning_fn=NULL;
       if (user_png_ver)
       {

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

            user_png_ver);
         png_warning(png_ptr, msg);
       }
            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
          png_libpng_ver);
       png_warning(png_ptr, msg);
    }
 #endif

-   if(png_sizeof(png_struct) > png_struct_size)
+   if (png_sizeof(png_struct) > png_struct_size)

      {
        png_ptr->error_fn=NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
      {
        png_ptr->error_fn=NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED


@@ -593,7 +616,7 @@ png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
        png_error(png_ptr,
        "The png struct allocated by the application for writing is too small.");
      }
        png_error(png_ptr,
        "The png struct allocated by the application for writing is too small.");
      }

-   if(png_sizeof(png_info) > png_info_size)
+   if (png_sizeof(png_info) > png_info_size)

      {
        png_ptr->error_fn=NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
      {
        png_ptr->error_fn=NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED


@@ -604,6 +627,7 @@ png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
      }
    png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
 }
      }
    png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
 }

+#endif /* PNG_1_0_X || PNG_1_2_X */

 
 
 void PNGAPI
 
 
 void PNGAPI


@@ -614,7 +638,12 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 #ifdef PNG_SETJMP_SUPPORTED
    jmp_buf tmp_jmp; /* to save current jump buffer */
 #endif
 #ifdef PNG_SETJMP_SUPPORTED
    jmp_buf tmp_jmp; /* to save current jump buffer */
 #endif

+

    int i = 0;
    int i = 0;

+
+   if (png_ptr == NULL)
+      return;
+

    do
    {
      if (user_png_ver[i] != png_libpng_ver[i])
    do
    {
      if (user_png_ver[i] != png_libpng_ver[i])


@@ -624,17 +653,17 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 #else
        png_ptr->warning_fn=NULL;
        png_warning(png_ptr,
 #else
        png_ptr->warning_fn=NULL;
        png_warning(png_ptr,

-     "Application uses deprecated png_write_init() and should be recompiled.");
+ "Application uses deprecated png_write_init() and should be recompiled.");

        break;
 #endif
      }
    } while (png_libpng_ver[i++]);
 
        break;
 #endif
      }
    } while (png_libpng_ver[i++]);
 

-   png_debug(1, "in png_write_init_3\n");
+   png_debug(1, "in png_write_init_3");

 
 #ifdef PNG_SETJMP_SUPPORTED
    /* save jump buffer and error functions */
 
 #ifdef PNG_SETJMP_SUPPORTED
    /* save jump buffer and error functions */

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

 #endif
 
    if (png_sizeof(png_struct) > png_struct_size)
 #endif
 
    if (png_sizeof(png_struct) > png_struct_size)


@@ -645,7 +674,7 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
      }
 
    /* reset all variables to 0 */
      }
 
    /* reset all variables to 0 */

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

 
    /* added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 
    /* added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED


@@ -653,15 +682,9 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
 #endif
 
    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 */
 #ifdef PNG_SETJMP_SUPPORTED
    /* restore jump buffer */

-   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+   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,
 #endif
 
    png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,


@@ -690,7 +713,11 @@ 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");
+   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++)
    {
    /* loop through the rows */
    for (i = 0, rp = row; i < num_rows; i++, rp++)
    {


@@ -708,7 +735,10 @@ 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 (png_ptr == NULL)
+      return;
+
+   png_debug(1, "in png_write_image");

 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* intialize interlace handling.  If image is not interlaced,
       this will set pass to 1 */
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* intialize interlace handling.  If image is not interlaced,
       this will set pass to 1 */


@@ -731,8 +761,11 @@ png_write_image(png_structp png_ptr, png_bytepp image)
 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 */
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {
    /* initialize transformations and other stuff if first time */
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {


@@ -844,12 +877,12 @@ 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. */
    png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
 
    /* Copy user's row into buffer, leaving room for filter byte. */
    png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,


@@ -885,7 +918,7 @@ 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 */


@@ -905,7 +938,9 @@ png_write_row(png_structp png_ptr, png_bytep row)
 void PNGAPI
 png_set_flush(png_structp png_ptr, int nrows)
 {
 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);
 }
 


@@ -915,7 +950,9 @@ png_write_flush(png_structp png_ptr)
 {
    int wrote_IDAT;
 
 {
    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)
      return;
    /* We have already written out all of the data */
    if (png_ptr->row_number >= png_ptr->num_rows)
      return;


@@ -973,7 +1010,7 @@ 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 +1020,32 @@ 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 (png_ptr != NULL)
+      {
+        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);

 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)

-      if (png_ptr->num_chunk_list)
-      {
-         png_free(png_ptr, png_ptr->chunk_list);
-         png_ptr->chunk_list=NULL;
-         png_ptr->num_chunk_list=0;
-      }
+        if (png_ptr->num_chunk_list)
+        {
+           png_free(png_ptr, png_ptr->chunk_list);
+           png_ptr->chunk_list=NULL;
+           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,


@@ -1036,18 +1084,20 @@ 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");
+   png_debug(1, "in png_write_destroy");

    /* free any memory zlib uses */
    deflateEnd(&png_ptr->zstream);
 
    /* free our memory.  png_free checks NULL for us. */
    png_free(png_ptr, png_ptr->zbuf);
    png_free(png_ptr, png_ptr->row_buf);
    /* free any memory zlib uses */
    deflateEnd(&png_ptr->zstream);
 
    /* free our memory.  png_free checks NULL for us. */
    png_free(png_ptr, png_ptr->zbuf);
    png_free(png_ptr, png_ptr->row_buf);

+#ifndef PNG_NO_WRITE_FILTER

    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)
    png_free(png_ptr, png_ptr->time_buffer);
 
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
    png_free(png_ptr, png_ptr->time_buffer);


@@ -1063,7 +1113,7 @@ png_write_destroy(png_structp png_ptr)
 
 #ifdef PNG_SETJMP_SUPPORTED
    /* reset structure */
 
 #ifdef PNG_SETJMP_SUPPORTED
    /* reset structure */

-   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+   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 +1123,7 @@ 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 +1133,7 @@ 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 +1141,11 @@ 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");
+   png_debug(1, "in png_set_filter");
+   if (png_ptr == NULL)
+      return;

 #if defined(PNG_MNG_FEATURES_SUPPORTED)
 #if defined(PNG_MNG_FEATURES_SUPPORTED)

-   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+   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 +1153,26 @@ png_set_filter(png_structp png_ptr, int method, int filters)
    {
       switch (filters & (PNG_ALL_FILTERS | 0x07))
       {
    {
       switch (filters & (PNG_ALL_FILTERS | 0x07))
       {

+#ifndef PNG_NO_WRITE_FILTER

          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_NO_WRITE_FILTER */
+         case PNG_FILTER_VALUE_NONE:
+              png_ptr->do_filter=PNG_FILTER_NONE; break;
+#ifndef PNG_NO_WRITE_FILTER
+         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_NO_WRITE_FILTER */

       }
 
       /* 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 +1186,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
        */
       if (png_ptr->row_buf != NULL)
       {
        */
       if (png_ptr->row_buf != NULL)
       {

+#ifndef PNG_NO_WRITE_FILTER

          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 +1241,7 @@ 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_NO_WRITE_FILTER */

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


@@ -1199,7 +1264,9 @@ 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 +1378,9 @@ 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 +1388,9 @@ 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 +1398,9 @@ 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;
 }


@@ -1335,6 +1408,8 @@ 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)
    if (window_bits > 15)
       png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
    else if (window_bits < 8)


@@ -1354,7 +1429,9 @@ 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;


@@ -1364,6 +1441,8 @@ 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;
 }
 


@@ -1372,7 +1451,9 @@ void PNGAPI
 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    write_user_transform_fn)
 {
 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;
 }
    png_ptr->transformations |= PNG_USER_TRANSFORM;
    png_ptr->write_user_transform_fn = write_user_transform_fn;
 }


@@ -1384,6 +1465,8 @@ void PNGAPI
 png_write_png(png_structp png_ptr, png_infop info_ptr,
               int transforms, voidp params)
 {
 png_write_png(png_structp png_ptr, png_infop info_ptr,
               int transforms, voidp params)
 {

+   if (png_ptr == NULL || info_ptr == NULL)
+      return;

 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
    /* invert the alpha channel from opacity to transparency */
    if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
    /* invert the alpha channel from opacity to transparency */
    if (transforms & PNG_TRANSFORM_INVERT_ALPHA)


@@ -1423,11 +1506,11 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
 #endif
 
 #if defined(PNG_WRITE_FILLER_SUPPORTED)
 #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);
+   /* 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
 
 #if defined(PNG_WRITE_BGR_SUPPORTED)
 #endif
 
 #if defined(PNG_WRITE_BGR_SUPPORTED)


@@ -1457,8 +1540,8 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
 
    /* 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 */