Have GetDescBoxHeight() return value consistent with one given to SetDescBoxHeight...

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

diff --git a/src/png/pngwrite.c b/src/png/pngwrite.c
index 699207c04a8596485fc17a743af019fe3504bc1f..c6df1ef34255818ad40bf2fc5dce8497e5e9af74 100644 (file)
--- a/src/png/pngwrite.c
+++ b/src/png/pngwrite.c
@@ -1,36 +1,43 @@
-   
+

 /* pngwrite.c - general routines to write a PNG file
  *
 /* pngwrite.c - general routines to write a PNG file
  *

- * libpng 1.0.1
+ * Last changed in libpng 1.2.15 January 5, 2007

  * 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) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, Glenn Randers-Pehrson
- * March 15, 1998
+ * Copyright (c) 1998-2007 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.)

  */
 
 /* get internal access to png.h */
 #define PNG_INTERNAL
  */
 
 /* get internal access to png.h */
 #define PNG_INTERNAL

-#include "../png/png.h"
+#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED

 
 /* 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,
  * and put it in the correct location here.  If you want the chunk written
 
 /* 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,
  * and put it in the correct location here.  If you want the chunk written

- * after the image data, put it in png_write_end().  I strongly encurage
+ * after the image data, put it in png_write_end().  I strongly encourage

  * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
  * the chunk, as that will keep the code from breaking if you want to just
  * write a plain PNG file.  If you have long comments, I suggest writing
  * them in png_write_end(), and compressing them.
  */
  * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
  * the chunk, as that will keep the code from breaking if you want to just
  * write a plain PNG file.  If you have long comments, I suggest writing
  * them in png_write_end(), and compressing them.
  */

-void
-png_write_info(png_structp png_ptr, png_infop info_ptr)
+void PNGAPI
+png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)

 {
 {

-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
-   int i;
-#endif
-
-   png_debug(1, "in png_write_info\n");
+   png_debug(1, "in png_write_info_before_PLTE\n");
+   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 */
    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))
+   {
+      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream");
+      png_ptr->mng_features_permitted=0;
+   }
+#endif

    /* 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,
    /* 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,


@@ -44,41 +51,107 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
       flag set, and if it does, writes the chunk. */
 #if defined(PNG_WRITE_gAMA_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_gAMA)
       flag set, and if it does, writes the chunk. */
 #if defined(PNG_WRITE_gAMA_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_gAMA)

+   {
+#  ifdef PNG_FLOATING_POINT_SUPPORTED

       png_write_gAMA(png_ptr, info_ptr->gamma);
       png_write_gAMA(png_ptr, info_ptr->gamma);

+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+      png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
+#  endif
+#endif
+   }

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

+#if defined(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 defined(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 defined(PNG_WRITE_cHRM_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_cHRM)
 #if defined(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 defined(PNG_WRITE_cHRM_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_cHRM)

+   {
+#ifdef PNG_FLOATING_POINT_SUPPORTED

       png_write_cHRM(png_ptr,
          info_ptr->x_white, info_ptr->y_white,
          info_ptr->x_red, info_ptr->y_red,
          info_ptr->x_green, info_ptr->y_green,
          info_ptr->x_blue, info_ptr->y_blue);
       png_write_cHRM(png_ptr,
          info_ptr->x_white, info_ptr->y_white,
          info_ptr->x_red, info_ptr->y_red,
          info_ptr->x_green, info_ptr->y_green,
          info_ptr->x_blue, info_ptr->y_blue);

+#else
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+      png_write_cHRM_fixed(png_ptr,
+         info_ptr->int_x_white, info_ptr->int_y_white,
+         info_ptr->int_x_red, info_ptr->int_y_red,
+         info_ptr->int_x_green, info_ptr->int_y_green,
+         info_ptr->int_x_blue, info_ptr->int_y_blue);
+#  endif
+#endif
+   }
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+   if (info_ptr->unknown_chunks_num)
+   {
+       png_unknown_chunk *up;
+
+       png_debug(5, "writing extra chunks\n");
+
+       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)))
+         {
+            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+       }
+   }

 #endif
 #endif

+      png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
+   }
+}
+
+void PNGAPI
+png_write_info(png_structp png_ptr, png_infop info_ptr)
+{
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
+   int i;
+#endif
+
+   png_debug(1, "in png_write_info\n");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   png_write_info_before_PLTE(png_ptr, info_ptr);
+

    if (info_ptr->valid & PNG_INFO_PLTE)
       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)
    if (info_ptr->valid & PNG_INFO_PLTE)
       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_INVERT_ALPHA_SUPPORTED)
          /* invert the alpha channel (in tRNS) */
 
 #if defined(PNG_WRITE_tRNS_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_tRNS)
       {
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
          /* invert the alpha channel (in tRNS) */

-         if (png_ptr->transformations & PNG_INVERT_ALPHA &&
+         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->color_type == PNG_COLOR_TYPE_PALETTE)
          {
             int j;
             for (j=0; j<(int)info_ptr->num_trans; j++)

-               info_ptr->trans[j] = 255 - info_ptr->trans[j];
+               info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);

          }
 #endif
       png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
          }
 #endif
       png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),


@@ -104,6 +177,21 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
          info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
          info_ptr->pcal_units, info_ptr->pcal_params);
 #endif
          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)
+   if (info_ptr->valid & PNG_INFO_sCAL)
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+      png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
+          info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
+#else
+#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
+      png_warning(png_ptr,
+          "png_write_sCAL not supported; sCAL chunk not written.");
+#endif
+#endif
+#endif

 #if defined(PNG_WRITE_pHYs_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_pHYs)
       png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
 #if defined(PNG_WRITE_pHYs_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_pHYs)
       png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,


@@ -113,25 +201,47 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
    if (info_ptr->valid & PNG_INFO_tIME)
    {
       png_write_tIME(png_ptr, &(info_ptr->mod_time));
    if (info_ptr->valid & PNG_INFO_tIME)
    {
       png_write_tIME(png_ptr, &(info_ptr->mod_time));

-      png_ptr->flags |= PNG_FLAG_WROTE_tIME;
+      png_ptr->mode |= PNG_WROTE_tIME;

    }
 #endif
    }
 #endif

-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(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);
+#endif
+#if defined(PNG_WRITE_TEXT_SUPPORTED)

    /* 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,
          info_ptr->text[i].compression);
    /* 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,
          info_ptr->text[i].compression);

+      /* an internationalized chunk? */
+      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);
+#else
+          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;
+      }

       /* If we want a compressed text chunk */
       /* If we want a compressed text chunk */

-      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 */
          png_write_zTXt(png_ptr, info_ptr->text[i].key,
       {
 #if defined(PNG_WRITE_zTXt_SUPPORTED)
          /* write compressed chunk */
          png_write_zTXt(png_ptr, info_ptr->text[i].key,

-            info_ptr->text[i].text, info_ptr->text[i].text_length,
+            info_ptr->text[i].text, 0,

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


@@ -141,15 +251,39 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_WRITE_tEXt_SUPPORTED)
          /* write uncompressed chunk */
          png_write_tEXt(png_ptr, info_ptr->text[i].key,
 #if defined(PNG_WRITE_tEXt_SUPPORTED)
          /* write uncompressed chunk */
          png_write_tEXt(png_ptr, info_ptr->text[i].key,

-            info_ptr->text[i].text, info_ptr->text[i].text_length);
+                         info_ptr->text[i].text,
+                         0);

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

+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+   if (info_ptr->unknown_chunks_num)
+   {
+       png_unknown_chunk *up;
+
+       png_debug(5, "writing extra chunks\n");
+
+       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)))
+         {
+            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+       }
+   }
+#endif

 }
 
 /* Writes the end of the PNG file.  If you don't want to write comments or
 }
 
 /* Writes the end of the PNG file.  If you don't want to write comments or


@@ -157,40 +291,59 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
  * in png_write_info(), do not write them again here.  If you have long
  * comments, I suggest writing them here, and compressing them.
  */
  * in png_write_info(), do not write them again here.  If you have long
  * comments, I suggest writing them here, and compressing them.
  */

-void
+void PNGAPI

 png_write_end(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_write_end\n");
 png_write_end(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_write_end\n");

+   if (png_ptr == NULL)
+      return;

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

-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED)

       int i; /* local index variable */
 #endif
 #if defined(PNG_WRITE_tIME_SUPPORTED)
       /* check to see if user has supplied a time chunk */
       int i; /* local index variable */
 #endif
 #if defined(PNG_WRITE_tIME_SUPPORTED)
       /* check to see if user has supplied a time chunk */

-      if (info_ptr->valid & PNG_INFO_tIME &&
-         !(png_ptr->flags & PNG_FLAG_WROTE_tIME))
+      if ((info_ptr->valid & PNG_INFO_tIME) &&
+         !(png_ptr->mode & PNG_WROTE_tIME))

          png_write_tIME(png_ptr, &(info_ptr->mod_time));
 #endif
          png_write_tIME(png_ptr, &(info_ptr->mod_time));
 #endif

-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED)

       /* 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,
             info_ptr->text[i].compression);
       /* 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,
             info_ptr->text[i].compression);

-         if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+         /* an internationalized chunk? */
+         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);
+#else
+             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;
+         }
+         else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)

          {
 #if defined(PNG_WRITE_zTXt_SUPPORTED)
             /* write compressed chunk */
             png_write_zTXt(png_ptr, info_ptr->text[i].key,
          {
 #if defined(PNG_WRITE_zTXt_SUPPORTED)
             /* write compressed chunk */
             png_write_zTXt(png_ptr, info_ptr->text[i].key,

-               info_ptr->text[i].text, info_ptr->text[i].text_length,
+               info_ptr->text[i].text, 0,

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


@@ -200,15 +353,37 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_WRITE_tEXt_SUPPORTED)
             /* write uncompressed chunk */
             png_write_tEXt(png_ptr, info_ptr->text[i].key,
 #if defined(PNG_WRITE_tEXt_SUPPORTED)
             /* write uncompressed chunk */
             png_write_tEXt(png_ptr, info_ptr->text[i].key,

-               info_ptr->text[i].text, info_ptr->text[i].text_length);
+               info_ptr->text[i].text, 0);

 #else
 #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;
          }
       }

+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+   if (info_ptr->unknown_chunks_num)
+   {
+       png_unknown_chunk *up;
+
+       png_debug(5, "writing extra chunks\n");
+
+       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 ||
+            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+         {
+            png_write_chunk(png_ptr, up->name, up->data, up->size);
+         }
+       }
+   }

 #endif
    }
 
 #endif
    }
 


@@ -218,45 +393,10 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
    png_write_IEND(png_ptr);
 }
 
    png_write_IEND(png_ptr);
 }
 

-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-/* Convert the supplied time into an RFC 1123 string suitable for use in
- * a "Creation Time" or other text-based time string.
- */
-png_charp
-png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
-{
-   static PNG_CONST char short_months[12][4] =
-       {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
-        "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
-
-   if (png_ptr->time_buffer == NULL)
-   {
-      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
-         sizeof(char)));
-   }
-
-#ifdef USE_FAR_KEYWORD
-   {
-      char near_time_buf[29];
-      sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
-               ptime->day % 31, short_months[ptime->month - 1],
-               ptime->year, ptime->hour % 24, ptime->minute % 60,
-               ptime->second % 61);
-      png_memcpy(png_ptr->time_buffer, near_time_buf,
-      29*sizeof(char));
-   }
-#else
-   sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
-               ptime->day % 31, short_months[ptime->month - 1],
-               ptime->year, ptime->hour % 24, ptime->minute % 60,
-               ptime->second % 61);
-#endif
-   return ((png_charp)png_ptr->time_buffer);
-}
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
-

 #if defined(PNG_WRITE_tIME_SUPPORTED)
 #if defined(PNG_WRITE_tIME_SUPPORTED)

-void
+#if !defined(_WIN32_WCE)
+/* "time.h" functions are not supported on WindowsCE */
+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_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
 {
    png_debug(1, "in png_convert_from_struct_tm\n");


@@ -268,7 +408,7 @@ png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
    ptime->second = (png_byte)ttime->tm_sec;
 }
 
    ptime->second = (png_byte)ttime->tm_sec;
 }
 

-void
+void PNGAPI

 png_convert_from_time_t(png_timep ptime, time_t ttime)
 {
    struct tm *tbuf;
 png_convert_from_time_t(png_timep ptime, time_t ttime)
 {
    struct tm *tbuf;


@@ -278,21 +418,49 @@ png_convert_from_time_t(png_timep ptime, time_t ttime)
    png_convert_from_struct_tm(ptime, tbuf);
 }
 #endif
    png_convert_from_struct_tm(ptime, tbuf);
 }
 #endif

+#endif

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

-png_structp
-png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
+png_structp PNGAPI
+png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,

    png_error_ptr error_fn, png_error_ptr warn_fn)
 {
    png_error_ptr error_fn, png_error_ptr warn_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));
+}
+
+/* Alternate initialize png_ptr structure, and allocate any memory needed */
+png_structp PNGAPI
+png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
+   png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */

    png_structp png_ptr;
    png_structp png_ptr;

+#ifdef PNG_SETJMP_SUPPORTED

 #ifdef USE_FAR_KEYWORD
    jmp_buf jmpbuf;
 #endif
 #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\n");

-   if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
-   {
-      return ((png_structp)NULL);
-   }
+#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);
+#else
+   png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+#endif /* PNG_USER_MEM_SUPPORTED */
+   if (png_ptr == NULL)
+      return (NULL);
+
+   /* 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
+
+#ifdef PNG_SETJMP_SUPPORTED

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


@@ -300,24 +468,58 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
 #endif
    {
       png_free(png_ptr, png_ptr->zbuf);
 #endif
    {
       png_free(png_ptr, png_ptr->zbuf);

+      png_ptr->zbuf=NULL;

       png_destroy_struct(png_ptr);
       png_destroy_struct(png_ptr);

-      return ((png_structp)NULL);
+      return (NULL);

    }
 #ifdef USE_FAR_KEYWORD
    }
 #ifdef USE_FAR_KEYWORD

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

 #endif
 #endif

+#endif
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
+#endif /* PNG_USER_MEM_SUPPORTED */

    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 

-   /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
-    * we must recompile any applications that use any older library version.
-    * For versions after libpng 1.0, we will be compatible, so we need
-    * only check the first digit.
-    */
-   if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
-       (png_libpng_ver[0] == '0' && user_png_ver[2] < '9'))
+   i=0;
+   do

    {
    {

-      png_error(png_ptr,
-         "Incompatible libpng version in application and library");
+     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)
+   {
+     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+      * we must recompile any applications that use any older library version.
+      * For versions after libpng 1.0, we will be compatible, so we need
+      * only check the first digit.
+      */
+     if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+         (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)
+        char msg[80];
+        if (user_png_ver)
+        {
+          png_snprintf(msg, 80,
+             "Application was compiled with png.h from libpng-%.20s",
+             user_png_ver);
+          png_warning(png_ptr, msg);
+        }
+        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_ptr->flags=0;
+#endif
+        png_error(png_ptr,
+           "Incompatible libpng version in application and library");
+     }

    }
 
    /* initialize zbuf - compression buffer */
    }
 
    /* initialize zbuf - compression buffer */


@@ -325,42 +527,157 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
       (png_uint_32)png_ptr->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);
+   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,
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,

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

 #endif
 
 #endif
 

-   return ((png_structp)png_ptr);
+#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 */
 /* Initialize png_ptr structure, and allocate any memory needed */

-void
+#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)
 {
 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(png_ptr == NULL) return;
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+   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_snprintf(msg, 80,
+           "Application was compiled with png.h from libpng-%.20s",
+           user_png_ver);
+        png_warning(png_ptr, msg);
+      }
+      png_snprintf(msg, 80,
+         "Application  is  running with png.c from libpng-%.20s",
+         png_libpng_ver);
+      png_warning(png_ptr, msg);
+   }
+#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);
+}
+#endif /* PNG_1_0_X || PNG_1_2_X */
+
+
+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 */
    jmp_buf tmp_jmp; /* to save current jump buffer */

+#endif
+
+   int i = 0;
+
+   if (png_ptr == NULL)
+      return;

 
 

-   png_debug(1, "in png_write_init\n");
+   do
+   {
+     if (user_png_ver[i] != png_libpng_ver[i])
+     {
+#ifdef PNG_LEGACY_SUPPORTED
+       png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#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 */
    /* save jump buffer and error functions */

-   png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+#endif
+
+   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 */
 
    /* reset all variables to 0 */

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

 
 

+#ifdef PNG_SETJMP_SUPPORTED

    /* restore jump buffer */
    /* restore jump buffer */

-   png_memcpy(png_ptr->jmpbuf, tmp_jmp, 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,
+      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);
 
    /* 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)
    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,

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

 #endif
 }
 
 #endif
 }
 


@@ -369,7 +686,7 @@ png_write_init(png_structp png_ptr)
  * have called png_set_interlace_handling(), you will have to
  * "write" the image seven times.
  */
  * have called png_set_interlace_handling(), you will have to
  * "write" the image seven times.
  */

-void
+void PNGAPI

 png_write_rows(png_structp png_ptr, png_bytepp row,
    png_uint_32 num_rows)
 {
 png_write_rows(png_structp png_ptr, png_bytepp row,
    png_uint_32 num_rows)
 {


@@ -377,6 +694,10 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
    png_bytepp rp; /* row pointer */
 
    png_debug(1, "in png_write_rows\n");
    png_bytepp rp; /* row pointer */
 
    png_debug(1, "in png_write_rows\n");

+
+   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++)
    {


@@ -387,13 +708,16 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
 /* Write the image.  You only need to call this function once, even
  * if you are writing an interlaced image.
  */
 /* Write the image.  You only need to call this function once, even
  * if you are writing an interlaced image.
  */

-void
+void PNGAPI

 png_write_image(png_structp png_ptr, png_bytepp image)
 {
    png_uint_32 i; /* row index */
    int pass, num_pass; /* pass variables */
    png_bytepp rp; /* points to current row */
 
 png_write_image(png_structp png_ptr, png_bytepp image)
 {
    png_uint_32 i; /* row index */
    int pass, num_pass; /* pass variables */
    png_bytepp rp; /* points to current row */
 

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

    png_debug(1, "in png_write_image\n");
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* intialize interlace handling.  If image is not interlaced,
    png_debug(1, "in png_write_image\n");
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* intialize interlace handling.  If image is not interlaced,


@@ -414,14 +738,52 @@ 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
+void PNGAPI

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

+   if (png_ptr == NULL)
+      return;

    png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
       png_ptr->row_number, png_ptr->pass);
    png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
       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)
    {

+   /* 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 */
+#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.");
+#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.");
+#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.");
+#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.");
+#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.");
+#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.");
+#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.");
+#endif
+

       png_write_start_row(png_ptr);
    }
 
       png_write_start_row(png_ptr);
    }
 


@@ -432,49 +794,49 @@ png_write_row(png_structp png_ptr, png_bytep row)
       switch (png_ptr->pass)
       {
          case 0:
       switch (png_ptr->pass)
       {
          case 0:

-            if (png_ptr->row_number & 7)
+            if (png_ptr->row_number & 0x07)

             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 1:
             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 1:

-            if ((png_ptr->row_number & 7) || png_ptr->width < 5)
+            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)

             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 2:
             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 2:

-            if ((png_ptr->row_number & 7) != 4)
+            if ((png_ptr->row_number & 0x07) != 4)

             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 3:
             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 3:

-            if ((png_ptr->row_number & 3) || png_ptr->width < 3)
+            if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)

             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 4:
             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 4:

-            if ((png_ptr->row_number & 3) != 2)
+            if ((png_ptr->row_number & 0x03) != 2)

             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 5:
             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 5:

-            if ((png_ptr->row_number & 1) || png_ptr->width < 2)
+            if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)

             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 6:
             {
                png_write_finish_row(png_ptr);
                return;
             }
             break;
          case 6:

-            if (!(png_ptr->row_number & 1))
+            if (!(png_ptr->row_number & 0x01))

             {
                png_write_finish_row(png_ptr);
                return;
             {
                png_write_finish_row(png_ptr);
                return;


@@ -492,15 +854,15 @@ png_write_row(png_structp png_ptr, png_bytep row)
    png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
       png_ptr->row_info.channels);
 
    png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
       png_ptr->row_info.channels);
 

-   png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
-      (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+   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->color_type = %d\n", png_ptr->row_info.color_type);

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


@@ -526,6 +888,24 @@ png_write_row(png_structp png_ptr, png_bytep row)
    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)
+   /* 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
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 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) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
+

    /* Find a filter if necessary, filter the row and write it out. */
    png_write_find_filter(png_ptr, &(png_ptr->row_info));
 
    /* Find a filter if necessary, filter the row and write it out. */
    png_write_find_filter(png_ptr, &(png_ptr->row_info));
 


@@ -535,20 +915,24 @@ png_write_row(png_structp png_ptr, png_bytep row)
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
 /* Set the automatic flush interval or 0 to turn flushing off */
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
 /* Set the automatic flush interval or 0 to turn flushing off */

-void
+void PNGAPI

 png_set_flush(png_structp png_ptr, int nrows)
 {
    png_debug(1, "in png_set_flush\n");
 png_set_flush(png_structp png_ptr, int nrows)
 {
    png_debug(1, "in png_set_flush\n");

+   if (png_ptr == NULL)
+      return;

    png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
 }
 
 /* flush the current output buffers now */
    png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
 }
 
 /* flush the current output buffers now */

-void
+void PNGAPI

 png_write_flush(png_structp png_ptr)
 {
    int wrote_IDAT;
 
    png_debug(1, "in png_write_flush\n");
 png_write_flush(png_structp png_ptr)
 {
    int wrote_IDAT;
 
    png_debug(1, "in png_write_flush\n");

+   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;


@@ -596,58 +980,78 @@ png_write_flush(png_structp png_ptr)
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 
 /* free all memory used by the write */
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 
 /* free all memory used by the write */

-void
+void PNGAPI

 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 {
    png_structp png_ptr = NULL;
    png_infop info_ptr = NULL;
 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 {
    png_structp png_ptr = NULL;
    png_infop info_ptr = NULL;

+#ifdef PNG_USER_MEM_SUPPORTED
+   png_free_ptr free_fn = NULL;
+   png_voidp mem_ptr = NULL;
+#endif

 
    png_debug(1, "in png_destroy_write_struct\n");
    if (png_ptr_ptr != NULL)
 
    png_debug(1, "in png_destroy_write_struct\n");
    if (png_ptr_ptr != NULL)

+   {

       png_ptr = *png_ptr_ptr;
       png_ptr = *png_ptr_ptr;

+#ifdef PNG_USER_MEM_SUPPORTED
+      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)
    {

-#ifdef PNG_WRITE_tEXt_SUPPORTED
-      png_free(png_ptr, info_ptr->text);
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-      png_free(png_ptr, info_ptr->pcal_purpose);
-      png_free(png_ptr, info_ptr->pcal_units);
-      if (info_ptr->pcal_params != NULL)
+      png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+      if (png_ptr->num_chunk_list)

       {
       {

-         int i;
-         for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
-         {
-            png_free(png_ptr, info_ptr->pcal_params[i]);
-         }
-         png_free(png_ptr, info_ptr->pcal_params);
+         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,
+         (png_voidp)mem_ptr);
+#else

       png_destroy_struct((png_voidp)info_ptr);
       png_destroy_struct((png_voidp)info_ptr);

-      *info_ptr_ptr = (png_infop)NULL;
+#endif
+      *info_ptr_ptr = NULL;

    }
 
    if (png_ptr != NULL)
    {
       png_write_destroy(png_ptr);
    }
 
    if (png_ptr != NULL)
    {
       png_write_destroy(png_ptr);

+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+         (png_voidp)mem_ptr);
+#else

       png_destroy_struct((png_voidp)png_ptr);
       png_destroy_struct((png_voidp)png_ptr);

-      *png_ptr_ptr = (png_structp)NULL;
+#endif
+      *png_ptr_ptr = NULL;

    }
 }
 
 
 /* Free any memory used in png_ptr struct (old method) */
    }
 }
 
 
 /* Free any memory used in png_ptr struct (old method) */

-void
+void /* PRIVATE */

 png_write_destroy(png_structp png_ptr)
 {
 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;
    png_voidp error_ptr;
    png_error_ptr error_fn;
    png_error_ptr warning_fn;
    png_voidp error_ptr;

+#ifdef PNG_USER_MEM_SUPPORTED
+   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\n");
    /* free any memory zlib uses */


@@ -661,52 +1065,81 @@ png_write_destroy(png_structp png_ptr)
    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->up_row);
    png_free(png_ptr, png_ptr->avg_row);
    png_free(png_ptr, png_ptr->paeth_row);

+

 #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);

-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
+

 #if defined(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->filter_costs);
    png_free(png_ptr, png_ptr->inv_filter_costs);
 #if defined(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->filter_costs);
    png_free(png_ptr, png_ptr->inv_filter_costs);

-#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
+#endif

 
 

+#ifdef PNG_SETJMP_SUPPORTED

    /* reset structure */
    /* reset structure */

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

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

+#ifdef PNG_USER_MEM_SUPPORTED
+   free_fn = png_ptr->free_fn;
+#endif

 
 

-   png_memset(png_ptr, 0, 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_ptr = error_ptr;
 
    png_ptr->error_fn = error_fn;
    png_ptr->warning_fn = warning_fn;
    png_ptr->error_ptr = error_ptr;

+#ifdef PNG_USER_MEM_SUPPORTED
+   png_ptr->free_fn = free_fn;
+#endif

 
 

-   png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#ifdef PNG_SETJMP_SUPPORTED
+   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+#endif

 }
 
 /* Allow the application to select one or more row filters to use. */
 }
 
 /* Allow the application to select one or more row filters to use. */

-void
+void PNGAPI

 png_set_filter(png_structp png_ptr, int method, int filters)
 {
    png_debug(1, "in png_set_filter\n");
 png_set_filter(png_structp png_ptr, int method, int filters)
 {
    png_debug(1, "in png_set_filter\n");

-   /* We allow 'method' only for future expansion of the base filter method. */
+   if (png_ptr == NULL)
+      return;
+#if defined(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

    if (method == PNG_FILTER_TYPE_BASE)
    {
       switch (filters & (PNG_ALL_FILTERS | 0x07))
       {
    if (method == PNG_FILTER_TYPE_BASE)
    {
       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


@@ -720,14 +1153,15 @@ png_set_filter(png_structp png_ptr, int method, int filters)
        */
       if (png_ptr->row_buf != NULL)
       {
        */
       if (png_ptr->row_buf != NULL)
       {

-         if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == 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,
               (png_ptr->rowbytes + 1));
             png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
          }
 
          {
             png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
               (png_ptr->rowbytes + 1));
             png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
          }
 

-         if (png_ptr->do_filter & PNG_FILTER_UP && png_ptr->up_row == NULL)
+         if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)

          {
             if (png_ptr->prev_row == NULL)
             {
          {
             if (png_ptr->prev_row == NULL)
             {


@@ -742,7 +1176,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
             }
          }
 
             }
          }
 

-         if (png_ptr->do_filter & PNG_FILTER_AVG && png_ptr->avg_row == NULL)
+         if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)

          {
             if (png_ptr->prev_row == NULL)
             {
          {
             if (png_ptr->prev_row == NULL)
             {


@@ -757,13 +1191,13 @@ png_set_filter(png_structp png_ptr, int method, int filters)
             }
          }
 
             }
          }
 

-         if (png_ptr->do_filter & PNG_FILTER_PAETH &&
+         if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&

              png_ptr->paeth_row == NULL)
          {
             if (png_ptr->prev_row == NULL)
             {
                png_warning(png_ptr, "Can't add Paeth filter after starting");
              png_ptr->paeth_row == NULL)
          {
             if (png_ptr->prev_row == NULL)
             {
                png_warning(png_ptr, "Can't add Paeth filter after starting");

-               png_ptr->do_filter &= ~PNG_FILTER_PAETH;
+               png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);

             }
             else
             {
             }
             else
             {


@@ -774,6 +1208,7 @@ 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;
       }
    }


@@ -789,16 +1224,16 @@ png_set_filter(png_structp png_ptr, int method, int filters)
  * better compression.
  */
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)      /* GRR 970116 */
  * better compression.
  */
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)      /* GRR 970116 */

-void
+void PNGAPI

 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
    int num_weights, png_doublep filter_weights,
    png_doublep filter_costs)
 {
 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
    int num_weights, png_doublep filter_weights,
    png_doublep filter_costs)
 {

-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)

    int i;
    int i;

-#endif

 
    png_debug(1, "in png_set_filter_heuristics\n");
 
    png_debug(1, "in png_set_filter_heuristics\n");

+   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");


@@ -816,15 +1251,15 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
       num_weights = 0;
    }
 
       num_weights = 0;
    }
 

-   png_ptr->num_prev_filters = num_weights;
-   png_ptr->heuristic_method = heuristic_method;
+   png_ptr->num_prev_filters = (png_byte)num_weights;
+   png_ptr->heuristic_method = (png_byte)heuristic_method;

 
    if (num_weights > 0)
    {
       if (png_ptr->prev_filters == NULL)
       {
          png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
 
    if (num_weights > 0)
    {
       if (png_ptr->prev_filters == NULL)
       {
          png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,

-            (png_uint_32)(sizeof(png_byte) * num_weights));
+            (png_uint_32)(png_sizeof(png_byte) * num_weights));

 
          /* To make sure that the weighting starts out fairly */
          for (i = 0; i < num_weights; i++)
 
          /* To make sure that the weighting starts out fairly */
          for (i = 0; i < num_weights; i++)


@@ -835,12 +1270,11 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 
       if (png_ptr->filter_weights == NULL)
       {
 
       if (png_ptr->filter_weights == NULL)
       {

-         png_ptr->filter_weights = (png_uint_16p) png_malloc(png_ptr,
-            (png_uint_32)(sizeof(png_uint_16) * num_weights));
-
-         png_ptr->inv_filter_weights = (png_uint_16p) png_malloc(png_ptr,
-            (png_uint_32)(sizeof(png_uint_16) * num_weights));
+         png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
+            (png_uint_32)(png_sizeof(png_uint_16) * num_weights));

 
 

+         png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
+            (png_uint_32)(png_sizeof(png_uint_16) * num_weights));

          for (i = 0; i < num_weights; i++)
          {
             png_ptr->inv_filter_weights[i] =
          for (i = 0; i < num_weights; i++)
          {
             png_ptr->inv_filter_weights[i] =


@@ -870,11 +1304,11 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
     */
    if (png_ptr->filter_costs == NULL)
    {
     */
    if (png_ptr->filter_costs == NULL)
    {

-      png_ptr->filter_costs = (png_uint_16p) png_malloc(png_ptr,
-         (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+      png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
+         (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));

 
 

-      png_ptr->inv_filter_costs = (png_uint_16p) png_malloc(png_ptr,
-         (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+      png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
+         (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));

 
       for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
       {
 
       for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
       {


@@ -908,63 +1342,173 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 }
 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
 
 }
 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
 

-void
+void PNGAPI

 png_set_compression_level(png_structp png_ptr, int level)
 {
    png_debug(1, "in png_set_compression_level\n");
 png_set_compression_level(png_structp png_ptr, int level)
 {
    png_debug(1, "in png_set_compression_level\n");

+   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;
 }
 

-void
+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_set_compression_mem_level(png_structp png_ptr, int mem_level)
 {
    png_debug(1, "in png_set_compression_mem_level\n");

+   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;
 }
 

-void
+void PNGAPI

 png_set_compression_strategy(png_structp png_ptr, int strategy)
 {
    png_debug(1, "in png_set_compression_strategy\n");
 png_set_compression_strategy(png_structp png_ptr, int strategy)
 {
    png_debug(1, "in png_set_compression_strategy\n");

+   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;
 }
 

-void
+void PNGAPI

 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
 {
 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");
    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 */
+   if (window_bits == 8)
+     {
+       png_warning(png_ptr, "Compression window is being reset to 512");
+       window_bits=9;
+     }
+#endif

    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
    png_ptr->zlib_window_bits = window_bits;
 }
 
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
    png_ptr->zlib_window_bits = window_bits;
 }
 

-void
+void PNGAPI

 png_set_compression_method(png_structp png_ptr, int method)
 {
    png_debug(1, "in png_set_compression_method\n");
 png_set_compression_method(png_structp png_ptr, int method)
 {
    png_debug(1, "in png_set_compression_method\n");

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

-void
+void PNGAPI

 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
 {
 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;
 }
 
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
    png_ptr->write_row_fn = write_row_fn;
 }
 
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)

-void
+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_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");

+   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)
+void PNGAPI
+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)
+       png_set_invert_alpha(png_ptr);
+#endif
+
+   /* 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 */
+   if (transforms & PNG_TRANSFORM_INVERT_MONO)
+       png_set_invert_mono(png_ptr);
+#endif
+
+#if defined(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))
+       png_set_shift(png_ptr, &info_ptr->sig_bit);
+#endif
+
+#if defined(PNG_WRITE_PACK_SUPPORTED)
+   /* pack pixels into bytes */
+   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 */
+   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+       png_set_swap_alpha(png_ptr);
+#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);
+#endif
+
+#if defined(PNG_WRITE_BGR_SUPPORTED)
+   /* flip BGR pixels to RGB */
+   if (transforms & PNG_TRANSFORM_BGR)
+       png_set_bgr(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SWAP_SUPPORTED)
+   /* swap bytes of 16-bit files to most significant byte first */
+   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+       png_set_swap(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+   /* swap bits of 1, 2, 4 bit packed pixel formats */
+   if (transforms & PNG_TRANSFORM_PACKSWAP)
+       png_set_packswap(png_ptr);
+#endif
+
+   /* ----------------------- end of transformations ------------------- */
+
+   /* 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);
+
+   transforms = transforms; /* quiet compiler warnings */
+   params = params;
+}
+#endif
+#endif /* PNG_WRITE_SUPPORTED */