*** empty log message ***

17 files changed, 308 insertions, 199 deletions

diff --git a/src/libpng/png.c b/src/libpng/png.c
index 62b86e1..c1f3e3e 100644
--- a/src/libpng/png.c
+++ b/src/libpng/png.c
@@ -1,11 +1,14 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
+ * Last changed in libpng 1.2.39 [August 13, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
@@ -13,7 +16,7 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_37 Your_png_h_is_not_version_1_2_37;
+typedef version_1_2_39 Your_png_h_is_not_version_1_2_39;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
@@ -145,7 +148,7 @@ png_check_sig(png_bytep sig, int num)
 #ifdef PNG_1_0_X
 voidpf PNGAPI
 #else
-voidpf /* private */
+voidpf /* PRIVATE */
 #endif
 png_zalloc(voidpf png_ptr, uInt items, uInt size)
 {
@@ -189,7 +192,7 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
 #ifdef PNG_1_0_X
 void PNGAPI
 #else
-void /* private */
+void /* PRIVATE */
 #endif
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
@@ -602,7 +605,7 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 
    png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
    if (png_ptr->num_chunk_list)
    {
       png_free(png_ptr, png_ptr->chunk_list);
@@ -702,7 +705,7 @@ png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
    png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.2.37 - June 4, 2009\n\
+   return ((png_charp) "\n libpng version 1.2.39 - August 13, 2009\n\
    Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\
    Copyright (c) 1996-1997 Andreas Dilger\n\
    Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
@@ -825,7 +828,8 @@ png_convert_size(size_t size)
  *    A and D, and X || Y is (X << 16) + Y.
 */
 
-void png_64bit_product (long v1, long v2, unsigned long *hi_product,
+void /* PRIVATE */
+png_64bit_product (long v1, long v2, unsigned long *hi_product,
    unsigned long *lo_product)
 {
    int a, b, c, d;
@@ -849,7 +853,7 @@ void png_64bit_product (long v1, long v2, unsigned long *hi_product,
    *lo_product = (unsigned long)lo;
 }
 
-int /* private */
+int /* PRIVATE */
 png_check_cHRM_fixed(png_structp png_ptr,
    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
diff --git a/src/libpng/png.h b/src/libpng/png.h
index 8092989..f6330be 100644
--- a/src/libpng/png.h
+++ b/src/libpng/png.h
@@ -1,14 +1,16 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.37 - June 4, 2009
+ * libpng version 1.2.39 - August 13, 2009
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license (See LICENSE, below)
+ *
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.37 - June 4, 2009: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.39 - August 13, 2009: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -229,6 +231,16 @@
  *    1.2.37beta01-03         13    10237  12.so.0.37[.0]
  *    1.2.37rc01              13    10237  12.so.0.37[.0]
  *    1.2.37                  13    10237  12.so.0.37[.0]
+ *    1.2.45                  10    10045  12.so.0.45[.0]
+ *    1.0.46                  10    10046  10.so.0.46[.0]
+ *    1.2.38beta01            13    10238  12.so.0.38[.0]
+ *    1.2.38rc01-03           13    10238  12.so.0.38[.0]
+ *    1.0.47                  10    10047  10.so.0.47[.0]
+ *    1.2.38                  13    10238  12.so.0.38[.0]
+ *    1.2.39beta01-05         13    10239  12.so.0.39[.0]
+ *    1.2.39rc01              13    10239  12.so.0.39[.0]
+ *    1.0.48                  10    10048  10.so.0.48[.0]
+ *    1.2.39                  13    10239  12.so.0.39[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -258,7 +270,9 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.37, June 4, 2009, are
+ * This code is released under the libpng license.
+ *
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.39, August 13, 2009, are
  * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -370,13 +384,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    June 4, 2009
+ *    August 13, 2009
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.37 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.39 are Y2K compliant.  It is my belief that earlier
  *    versions were also Y2K compliant.
  *
  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -432,9 +446,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.37"
+#define PNG_LIBPNG_VER_STRING "1.2.39"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.37 - June 4, 2009\n"
+   " libpng version 1.2.39 - August 13, 2009\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -442,9 +456,10 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 37
+#define PNG_LIBPNG_VER_RELEASE 39
 /* This should match the numeric part of the final component of
- * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero:
+ */
 
 #define PNG_LIBPNG_VER_BUILD  0
 
@@ -454,7 +469,7 @@
 #define PNG_LIBPNG_BUILD_RC       3
 #define PNG_LIBPNG_BUILD_STABLE   4
 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
-  
+
 /* Release-Specific Flags */
 #define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
                                        PNG_LIBPNG_BUILD_STABLE only */
@@ -469,8 +484,9 @@
  * We must not include leading zeros.
  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
- * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
-#define PNG_LIBPNG_VER 10237 /* 1.2.37 */
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
+ */
+#define PNG_LIBPNG_VER 10239 /* 1.2.39 */
 
 #ifndef PNG_VERSION_INFO_ONLY
 /* include the compression library's header */
@@ -485,12 +501,12 @@
 /* Ref MSDN: Private as priority over Special
  * VS_FF_PRIVATEBUILD File *was not* built using standard release
  * procedures. If this value is given, the StringFileInfo block must
- * contain a PrivateBuild string. 
+ * contain a PrivateBuild string.
  *
  * VS_FF_SPECIALBUILD File *was* built by the original company using
  * standard release procedures but is a variation of the standard
  * file of the same version number. If this value is given, the
- * StringFileInfo block must contain a SpecialBuild string. 
+ * StringFileInfo block must contain a SpecialBuild string.
  */
 
 #if defined(PNG_USER_PRIVATEBUILD)
@@ -552,7 +568,7 @@ extern "C" {
 #define png_write_status_ptr_NULL NULL
 #endif
 
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
+/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
 /* Version information for C files, stored in png.c.  This had better match
  * the version above.
@@ -678,7 +694,8 @@ typedef png_text FAR * FAR * png_textpp;
 #endif
 
 /* Supported compression types for text in PNG files (tEXt, and zTXt).
- * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
+ * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
+ */
 #define PNG_TEXT_COMPRESSION_NONE_WR -3
 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
 #define PNG_TEXT_COMPRESSION_NONE    -1
@@ -705,7 +722,8 @@ typedef struct png_time_struct
 typedef png_time FAR * png_timep;
 typedef png_time FAR * FAR * png_timepp;
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
 /* png_unknown_chunk is a structure to hold queued chunks for which there is
  * no specific support.  The idea is that we can use this to queue
  * up private chunks for output even though the library doesn't actually
@@ -940,8 +958,9 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
 #endif
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunks that the library doesn't recognize. */
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
+   /* Storage for unknown chunks that the library doesn't recognize. */
    png_unknown_chunkp unknown_chunks;
    png_size_t unknown_chunks_num;
 #endif
@@ -956,7 +975,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
 #endif
 
 #if defined(PNG_sPLT_SUPPORTED)
-   /* data on sPLT chunks (there may be more than one). */
+   /* Data on sPLT chunks (there may be more than one). */
    png_sPLT_tp splt_palettes;
    png_uint_32 splt_palettes_num;
 #endif
@@ -1291,7 +1310,7 @@ struct png_struct_def
 #endif /* PNG_bKGD_SUPPORTED */
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
-   png_flush_ptr output_flush_fn;/* Function for flushing output */
+   png_flush_ptr output_flush_fn; /* Function for flushing output */
    png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
    png_uint_32 flush_rows;    /* number of rows written since last flush */
 #endif
@@ -1389,7 +1408,7 @@ struct png_struct_def
 /* New members added in libpng-1.0.6 */
 
 #ifdef PNG_FREE_ME_SUPPORTED
-   png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
+   png_uint_32 free_me;   /* flags items libpng is responsible for freeing */
 #endif
 
 #if defined(PNG_USER_CHUNKS_SUPPORTED)
@@ -1397,7 +1416,7 @@ struct png_struct_def
    png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
 #endif
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
    int num_chunk_list;
    png_bytep chunk_list;
 #endif
@@ -1451,21 +1470,21 @@ struct png_struct_def
 
 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_voidp mem_ptr;                /* user supplied struct for mem functions */
-   png_malloc_ptr malloc_fn;         /* function for allocating memory */
-   png_free_ptr free_fn;             /* function for freeing memory */
+   png_voidp mem_ptr;            /* user supplied struct for mem functions */
+   png_malloc_ptr malloc_fn;     /* function for allocating memory */
+   png_free_ptr free_fn;         /* function for freeing memory */
 #endif
 
 /* New member added in libpng-1.0.13 and 1.2.0 */
-   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
+   png_bytep big_row_buf;        /* buffer to save current (unfiltered) row */
 
 #if defined(PNG_READ_DITHER_SUPPORTED)
 /* The following three members were added at version 1.0.14 and 1.2.4 */
-   png_bytep dither_sort;            /* working sort array */
-   png_bytep index_to_palette;       /* where the original index currently is */
-                                     /* in the palette */
-   png_bytep palette_to_index;       /* which original index points to this */
-                                     /* palette color */
+   png_bytep dither_sort;        /* working sort array */
+   png_bytep index_to_palette;   /* where the original index currently is */
+                                 /* in the palette */
+   png_bytep palette_to_index;   /* which original index points to this */
+                                 /* palette color */
 #endif
 
 /* New members added in libpng-1.0.16 and 1.2.6 */
@@ -1478,7 +1497,7 @@ struct png_struct_def
 
 /* New member added in libpng-1.0.25 and 1.2.17 */
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunk that the library doesn't recognize. */
+   /* Storage for unknown chunk that the library doesn't recognize. */
    png_unknown_chunk unknown_chunk;
 #endif
 
@@ -1494,7 +1513,7 @@ struct png_struct_def
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_2_37;
+typedef png_structp version_1_2_39;
 
 typedef png_struct FAR * FAR * png_structpp;
 
@@ -1598,7 +1617,7 @@ extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the information before the actual image data. */
+/* Read the information before the actual image data. */
 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 #endif
@@ -1611,11 +1630,11 @@ extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
 #if !defined(_WIN32_WCE)
 /* "time.h" functions are not supported on WindowsCE */
 #if defined(PNG_WRITE_tIME_SUPPORTED)
-/* convert from a struct tm to png_time */
+/* Convert from a struct tm to png_time */
 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
    struct tm FAR * ttime));
 
-/* convert from time_t to png_time.  Uses gmtime() */
+/* Convert from time_t to png_time.  Uses gmtime() */
 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
    time_t ttime));
 #endif /* PNG_WRITE_tIME_SUPPORTED */
@@ -1735,7 +1754,7 @@ extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
 #endif
 
 #if defined(PNG_READ_16_TO_8_SUPPORTED)
-/* strip the second byte of information from a 16-bit depth file. */
+/* Strip the second byte of information from a 16-bit depth file. */
 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
 #endif
 
@@ -1771,74 +1790,74 @@ extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
 #endif
 
-/* optional update palette with requested transformations */
+/* Optional update palette with requested transformations */
 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
 
-/* optional call to update the users info structure */
+/* Optional call to update the users info structure */
 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read one or more rows of image data. */
+/* Read one or more rows of image data. */
 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
    png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
 #endif
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read a row of data. */
+/* Read a row of data. */
 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
    png_bytep row,
    png_bytep display_row));
 #endif
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the whole image into memory at once. */
+/* Read the whole image into memory at once. */
 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
    png_bytepp image));
 #endif
 
-/* write a row of image data */
+/* Write a row of image data */
 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
    png_bytep row));
 
-/* write a few rows of image data */
+/* Write a few rows of image data */
 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
    png_bytepp row, png_uint_32 num_rows));
 
-/* write the image data */
+/* Write the image data */
 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
    png_bytepp image));
 
-/* writes the end of the PNG file. */
+/* Writes the end of the PNG file. */
 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the end of the PNG file. */
+/* Read the end of the PNG file. */
 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 #endif
 
-/* free any memory associated with the png_info_struct */
+/* Free any memory associated with the png_info_struct */
 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
    png_infopp info_ptr_ptr));
 
-/* free any memory associated with the png_struct and the png_info_structs */
+/* Free any memory associated with the png_struct and the png_info_structs */
 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
    png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
 
-/* free all memory used by the read (old method - NOT DLL EXPORTED) */
+/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
    png_infop end_info_ptr));
 
-/* free any memory associated with the png_struct and the png_info_structs */
+/* Free any memory associated with the png_struct and the png_info_structs */
 extern PNG_EXPORT(void,png_destroy_write_struct)
    PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
 
-/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
+/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
 extern void png_write_destroy PNGARG((png_structp png_ptr));
 
-/* set the libpng method of handling chunk CRC errors */
+/* Set the libpng method of handling chunk CRC errors */
 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
    int crit_action, int ancil_action));
 
@@ -1866,7 +1885,7 @@ extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
  * header file (zlib.h) for an explination of the compression functions.
  */
 
-/* set the filtering method(s) used by libpng.  Currently, the only valid
+/* Set the filtering method(s) used by libpng.  Currently, the only valid
  * value for "method" is 0.
  */
 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
@@ -2063,11 +2082,11 @@ extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
    png_progressive_end_ptr end_fn));
 
-/* returns the user pointer associated with the push read functions */
+/* Returns the user pointer associated with the push read functions */
 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
    PNGARG((png_structp png_ptr));
 
-/* function to be called when data becomes available */
+/* Function to be called when data becomes available */
 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
 
@@ -2089,7 +2108,7 @@ extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
    png_uint_32 size));
 #endif
 
-/* frees a pointer allocated by png_malloc() */
+/* Frees a pointer allocated by png_malloc() */
 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
 
 #if defined(PNG_1_0_X)
@@ -2106,11 +2125,12 @@ extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_uint_32 free_me, int num));
 #ifdef PNG_FREE_ME_SUPPORTED
 /* Reassign responsibility for freeing existing data, whether allocated
- * by libpng or by the application */
+ * by libpng or by the application
+ */
 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
    png_infop info_ptr, int freer, png_uint_32 mask));
 #endif
-/* assignments for png_data_freer */
+/* Assignments for png_data_freer */
 #define PNG_DESTROY_WILL_FREE_DATA 1
 #define PNG_SET_WILL_FREE_DATA 1
 #define PNG_USER_WILL_FREE_DATA 2
@@ -2194,11 +2214,13 @@ png_infop info_ptr));
 
 #if defined(PNG_INFO_IMAGE_SUPPORTED)
 /* Returns row_pointers, which is an array of pointers to scanlines that was
-returned from png_read_png(). */
+ * returned from png_read_png().
+ */
 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
 png_infop info_ptr));
 /* Set row_pointers, which is an array of pointers to scanlines for use
-by png_write_png(). */
+ * by png_write_png().
+ */
 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_bytepp row_pointers));
 #endif
@@ -2499,8 +2521,8 @@ extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
 #endif
 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-/* provide a list of chunks and how they are to be handled, if the built-in
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+/* Provide a list of chunks and how they are to be handled, if the built-in
    handling or default unknown chunk handling is not desired.  Any chunks not
    listed will be handled in the default manner.  The IHDR and IEND chunks
    must not be listed.
@@ -2511,6 +2533,10 @@ extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
 */
 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
    png_ptr, int keep, png_bytep chunk_list, int num_chunks));
+PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
+   chunk_name));
+#endif
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
@@ -2518,14 +2544,11 @@ extern PNG_EXPORT(void, png_set_unknown_chunk_location)
 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
    png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
 #endif
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
-   chunk_name));
-#endif
 
 /* Png_free_data() will turn off the "valid" flag for anything it frees.
-   If you need to turn it off for a chunk that your application has freed,
-   you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
+ * If you need to turn it off for a chunk that your application has freed,
+ * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
+ */
 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
    png_infop info_ptr, int mask));
 
@@ -2570,8 +2593,9 @@ extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
 #endif /* PNG_DEBUG_FILE */
 
 #if (PNG_DEBUG > 1)
-/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
- * non-ISO compilers */
+/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
+ * compilers.
+ */
 #  ifdef __STDC__
 #    ifndef png_debug
 #      define png_debug(l,m) \
@@ -2732,7 +2756,8 @@ extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
 
 /* Strip the prepended error numbers ("#nnn ") from error and warning
- * messages before passing them to the error or warning handler. */
+ * messages before passing them to the error or warning handler.
+ */
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
    png_ptr, png_uint_32 strip_mode));
@@ -2749,7 +2774,9 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
 #endif
 
 
-/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and in
+ * project defs
+ */
 
 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
@@ -2778,7 +2805,7 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
                         (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
        (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
 
-#else  /* standard method using integer division */
+#else  /* Standard method using integer division */
 
 #  define png_composite(composite, fg, alpha, bg)                            \
      (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \
@@ -2861,7 +2888,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
 #define PNG_HAVE_PNG_SIGNATURE    0x1000
 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
 
-/* flags for the transformations the PNG library does on the image data */
+/* Flags for the transformations the PNG library does on the image data */
 #define PNG_BGR                0x0001
 #define PNG_INTERLACE          0x0002
 #define PNG_PACK               0x0004
@@ -2895,7 +2922,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
                        /*  0x20000000L  unused */
                        /*  0x40000000L  unused */
 
-/* flags for png_create_struct */
+/* Flags for png_create_struct */
 #define PNG_STRUCT_PNG   0x0001
 #define PNG_STRUCT_INFO  0x0002
 
@@ -2905,7 +2932,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
 #define PNG_COST_SHIFT 3
 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
 
-/* flags for the png_ptr->flags rather than declaring a byte for each one */
+/* Flags for the png_ptr->flags rather than declaring a byte for each one */
 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
@@ -2947,7 +2974,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
 #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
                                      PNG_FLAG_CRC_CRITICAL_MASK)
 
-/* save typing and make code easier to understand */
+/* Save typing and make code easier to understand */
 
 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
    abs((int)((c1).green) - (int)((c2).green)) + \
@@ -2960,13 +2987,14 @@ extern PNG_EXPORT(void,png_save_uint_16)
     (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
 
 /* PNG_OUT_OF_RANGE returns true if value is outside the range
-   ideal-delta..ideal+delta.  Each argument is evaluated twice.
-   "ideal" and "delta" should be constants, normally simple
-   integers, "value" a variable. Added to libpng-1.2.6 JB */
+ * ideal-delta..ideal+delta.  Each argument is evaluated twice.
+ * "ideal" and "delta" should be constants, normally simple
+ * integers, "value" a variable. Added to libpng-1.2.6 JB
+ */
 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
         ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
 
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
+/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
 /* place to hold the signature string for a PNG file. */
 #ifdef PNG_USE_GLOBAL_ARRAYS
@@ -3087,7 +3115,8 @@ PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
 #endif
 
 /* Next four functions are used internally as callbacks.  PNGAPI is required
- * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
+ * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3.
+ */
 
 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
    png_bytep data, png_size_t length));
@@ -3152,10 +3181,10 @@ PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
 #endif
 
-/* simple function to write the signature */
+/* Simple function to write the signature */
 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
 
-/* write various chunks */
+/* Write various chunks */
 
 /* Write the IHDR chunk, and update the png_struct with the necessary
  * information.
@@ -3307,12 +3336,12 @@ PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
 #endif
 
-/* combine a row of data, dealing with alpha, etc. if requested */
+/* Combine a row of data, dealing with alpha, etc. if requested */
 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
    int mask));
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-/* expand an interlaced row */
+/* Expand an interlaced row */
 /* OLD pre-1.0.9 interface:
 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
    png_bytep row, int pass, png_uint_32 transformations));
@@ -3323,12 +3352,12 @@ PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
 /* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
 
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-/* grab pixels out of a row for an interlaced pass */
+/* Grab pixels out of a row for an interlaced pass */
 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
    png_bytep row, int pass));
 #endif
 
-/* unfilter a row */
+/* Unfilter a row */
 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
    png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
 
@@ -3339,16 +3368,16 @@ PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
 /* Write out the filtered row. */
 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
    png_bytep filtered_row));
-/* finish a row while reading, dealing with interlacing passes, etc. */
+/* Finish a row while reading, dealing with interlacing passes, etc. */
 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
 
-/* initialize the row buffers, etc. */
+/* Initialize the row buffers, etc. */
 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
-/* optional call to update the users info structure */
+/* Optional call to update the users info structure */
 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
-/* these are the functions that do the transformations */
+/* These are the functions that do the transformations */
 #if defined(PNG_READ_FILLER_SUPPORTED)
 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
    png_bytep row, png_uint_32 filler, png_uint_32 flags));
@@ -3470,7 +3499,7 @@ PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
  * then calls the appropriate callback for the chunk if it is valid.
  */
 
-/* decode the IHDR chunk */
+/* Decode the IHDR chunk */
 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
    png_uint_32 length));
 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
@@ -3569,7 +3598,7 @@ PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
    png_bytep chunk_name));
 
-/* handle the transformations for reading and writing */
+/* Handle the transformations for reading and writing */
 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
 
@@ -3672,6 +3701,14 @@ PNG_EXTERN int png_check_cHRM_fixed  PNGARG((png_structp png_ptr,
    png_fixed_point int_blue_y));
 #endif
 
+#if defined(PNG_cHRM_SUPPORTED)
+#if !defined(PNG_NO_CHECK_cHRM)
+/* Added at libpng version 1.2.34 */
+PNG_EXTERN void png_64bit_product (long v1, long v2, unsigned long *hi_product,
+   unsigned long *lo_product);
+#endif
+#endif
+
 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
 
 #endif /* PNG_INTERNAL */
@@ -3681,5 +3718,5 @@ PNG_EXTERN int png_check_cHRM_fixed  PNGARG((png_structp png_ptr,
 #endif
 
 #endif /* PNG_VERSION_INFO_ONLY */
-/* do not put anything past this line */
+/* Do not put anything past this line */
 #endif /* PNG_H */
diff --git a/src/libpng/pngconf.h b/src/libpng/pngconf.h
index 145e8eb..35523d8 100644
--- a/src/libpng/pngconf.h
+++ b/src/libpng/pngconf.h
@@ -1,11 +1,14 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.37 - June 4, 2009
- * For conditions of distribution and use, see copyright notice in png.h
+ * libpng version 1.2.39 - August 13, 2009
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 /* Any machine specific code is near the front of this file, so if you
@@ -19,7 +22,7 @@
 
 #define PNG_1_2_X
 
-/* 
+/*
  * PNG_USER_CONFIG has to be defined on the compiler command line. This
  * includes the resource compiler for Windows DLL configurations.
  */
@@ -39,7 +42,7 @@
 
 /*
  * Added at libpng-1.2.8
- *  
+ *
  * If you create a private DLL you need to define in "pngusr.h" the followings:
  * #define PNG_USER_PRIVATEBUILD <Describes by whom and why this version of
  *        the DLL was built>
@@ -50,8 +53,8 @@
  *        number and must match your private DLL name>
  *  e.g. // private DLL "libpng13gx.dll"
  *       #define PNG_USER_DLLFNAME_POSTFIX "gx"
- * 
- * The following macros are also at your disposal if you want to complete the 
+ *
+ * The following macros are also at your disposal if you want to complete the
  * DLL VERSIONINFO structure.
  * - PNG_USER_VERSIONINFO_COMMENTS
  * - PNG_USER_VERSIONINFO_COMPANYNAME
@@ -147,9 +150,9 @@
  * 'Cygwin' defines/defaults:
  *   PNG_BUILD_DLL -- (ignored) building the dll
  *   (no define)   -- (ignored) building an application, linking to the dll
- *   PNG_STATIC    -- (ignored) building the static lib, or building an 
+ *   PNG_STATIC    -- (ignored) building the static lib, or building an
  *                    application that links to the static lib.
- *   ALL_STATIC    -- (ignored) building various static libs, or building an 
+ *   ALL_STATIC    -- (ignored) building various static libs, or building an
  *                    application that links to the static libs.
  * Thus,
  * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
@@ -162,12 +165,12 @@
  *   PNG_BUILD_DLL
  *   PNG_STATIC
  *   (nothing) == PNG_USE_DLL
- * 
+ *
  * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
- *   of auto-import in binutils, we no longer need to worry about 
+ *   of auto-import in binutils, we no longer need to worry about
  *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
  *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
- *   to __declspec() stuff.  However, we DO need to worry about 
+ *   to __declspec() stuff.  However, we DO need to worry about
  *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
  *   such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
  */
@@ -211,8 +214,8 @@
 #        if !defined(PNG_DLL)
 #          define PNG_DLL
 #        endif
-#      endif  
-#    endif  
+#      endif
+#    endif
 #  endif
 #endif
 
@@ -487,7 +490,7 @@
  * iTXt support was added.  iTXt support was turned off by default through
  * libpng-1.2.x, to support old apps that malloc the png_text structure
  * instead of calling png_set_text() and letting libpng malloc it.  It
- * was turned on by default in libpng-1.3.0.
+ * will be turned on by default in libpng-1.4.0.
  */
 
 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
@@ -521,6 +524,7 @@
 #  define PNG_NO_FREE_ME
 #  define PNG_NO_READ_UNKNOWN_CHUNKS
 #  define PNG_NO_WRITE_UNKNOWN_CHUNKS
+#  define PNG_NO_HANDLE_AS_UNKNOWN
 #  define PNG_NO_READ_USER_CHUNKS
 #  define PNG_NO_READ_iCCP
 #  define PNG_NO_WRITE_iCCP
@@ -550,7 +554,7 @@
 #  define PNG_FREE_ME_SUPPORTED
 #endif
 
-#if defined(PNG_READ_SUPPORTED)
+#ifdef PNG_READ_SUPPORTED
 
 #if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
       !defined(PNG_NO_READ_TRANSFORMS)
@@ -638,7 +642,7 @@
 
 #endif /* PNG_READ_SUPPORTED */
 
-#if defined(PNG_WRITE_SUPPORTED)
+#ifdef PNG_WRITE_SUPPORTED
 
 # if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
     !defined(PNG_NO_WRITE_TRANSFORMS)
@@ -741,7 +745,7 @@
 #  define PNG_EASY_ACCESS_SUPPORTED
 #endif
 
-/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0 
+/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0
  * and removed from version 1.2.20.  The following will be removed
  * from libpng-1.4.0
 */
@@ -940,14 +944,22 @@
 #  define PNG_READ_zTXt_SUPPORTED
 #  define PNG_zTXt_SUPPORTED
 #endif
+#ifndef PNG_NO_READ_OPT_PLTE
+#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
+#endif                      /* optional PLTE chunk in RGB and RGBA images */
+#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
+    defined(PNG_READ_zTXt_SUPPORTED)
+#  define PNG_READ_TEXT_SUPPORTED
+#  define PNG_TEXT_SUPPORTED
+#endif
+
+#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
+
 #ifndef PNG_NO_READ_UNKNOWN_CHUNKS
 #  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
 #  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
 #    define PNG_UNKNOWN_CHUNKS_SUPPORTED
 #  endif
-#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
-#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#  endif
 #endif
 #if !defined(PNG_NO_READ_USER_CHUNKS) && \
      defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
@@ -960,17 +972,14 @@
 #    undef PNG_NO_HANDLE_AS_UNKNOWN
 #  endif
 #endif
-#ifndef PNG_NO_READ_OPT_PLTE
-#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
-#endif                      /* optional PLTE chunk in RGB and RGBA images */
-#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED)
-#  define PNG_READ_TEXT_SUPPORTED
-#  define PNG_TEXT_SUPPORTED
-#endif
 
-#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
+#ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
+#endif
 
+#ifdef PNG_WRITE_SUPPORTED
 #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
 
 #ifdef PNG_NO_WRITE_TEXT
@@ -1082,17 +1091,6 @@
 #    define PNG_zTXt_SUPPORTED
 #  endif
 #endif
-#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
-#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
-#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
-#  endif
-#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
-#     ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#       define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#     endif
-#  endif
-#endif
 #if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
     defined(PNG_WRITE_zTXt_SUPPORTED)
 #  define PNG_WRITE_TEXT_SUPPORTED
@@ -1103,6 +1101,20 @@
 
 #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
 
+#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
+#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#  endif
+#endif
+
+#ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
+#endif
+#endif /* PNG_WRITE_SUPPORTED */
+
 /* Turn this off to disable png_read_png() and
  * png_write_png() and leave the row_pointers member
  * out of the info structure.
@@ -1248,7 +1260,7 @@ typedef char            FAR * FAR * FAR * png_charppp;
 
 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 /* SPC -  Is this stuff deprecated? */
-/* It'll be removed as of libpng-1.3.0 - GR-P */
+/* It'll be removed as of libpng-1.4.0 - GR-P */
 /* libpng typedefs for types in zlib. If zlib changes
  * or another compression library is used, then change these.
  * Eliminates need to change all the source files.
@@ -1321,7 +1333,7 @@ typedef z_stream FAR *  png_zstreamp;
 #  define PNGAPI __cdecl
 #  undef PNG_IMPEXP
 #  define PNG_IMPEXP
-#endif  
+#endif
 
 /* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
  * you may get warnings regarding the linkage of png_zalloc and png_zfree.
diff --git a/src/libpng/pngerror.c b/src/libpng/pngerror.c
index 71a2e53..d68416b 100644
--- a/src/libpng/pngerror.c
+++ b/src/libpng/pngerror.c
@@ -2,11 +2,14 @@
 /* pngerror.c - stub functions for i/o and memory allocation
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all error handling.  Users who
  * need special error handling are expected to write replacement functions
  * and use png_set_error_fn() to use those functions.  See the instructions
diff --git a/src/libpng/pngget.c b/src/libpng/pngget.c
index 0022d95..38e4f9e 100644
--- a/src/libpng/pngget.c
+++ b/src/libpng/pngget.c
@@ -2,10 +2,14 @@
 /* pngget.c - retrieval of values from info struct
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  */
 
 #define PNG_INTERNAL
@@ -934,6 +938,6 @@ png_get_user_height_max (png_structp png_ptr)
     return (png_ptr? png_ptr->user_height_max : 0);
 }
 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
- 
+
 
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
diff --git a/src/libpng/pngmem.c b/src/libpng/pngmem.c
index d1999b6..e190cc3 100644
--- a/src/libpng/pngmem.c
+++ b/src/libpng/pngmem.c
@@ -2,11 +2,14 @@
 /* pngmem.c - stub functions for memory allocation
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all memory allocation.  Users who
  * need special memory handling are expected to supply replacement
  * functions for png_malloc() and png_free(), and to use
diff --git a/src/libpng/pngpread.c b/src/libpng/pngpread.c
index 9746c7a..7adb7b8 100644
--- a/src/libpng/pngpread.c
+++ b/src/libpng/pngpread.c
@@ -1,11 +1,14 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
+ * Last changed in libpng 1.2.38 [July 16, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
diff --git a/src/libpng/pngread.c b/src/libpng/pngread.c
index 370ecba..a4cbb3e 100644
--- a/src/libpng/pngread.c
+++ b/src/libpng/pngread.c
@@ -2,11 +2,14 @@
 /* pngread.c - read a PNG file
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
  */
@@ -102,7 +105,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    }
    else
         png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-   
+
 
    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
    {
diff --git a/src/libpng/pngrio.c b/src/libpng/pngrio.c
index 2c8e6a7..2267bca 100644
--- a/src/libpng/pngrio.c
+++ b/src/libpng/pngrio.c
@@ -2,11 +2,14 @@
 /* pngrio.c - functions for data input
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all input.  Users who need
  * special handling are expected to write a function that has the same
  * arguments as this and performs a similar function, but that possibly
diff --git a/src/libpng/pngrtran.c b/src/libpng/pngrtran.c
index af396df..d7e6b4a 100644
--- a/src/libpng/pngrtran.c
+++ b/src/libpng/pngrtran.c
@@ -1,12 +1,15 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
+ * Last changed in libpng 1.2.38 [July 16, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file contains functions optionally called by an application
  * in order to tell libpng how to handle data when reading a PNG.
  * Transformations that are used in both reading and writing are
@@ -714,8 +717,8 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
 #endif
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
+    defined(PNG_LEGACY_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
 void PNGAPI
 png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    read_user_transform_fn)
@@ -1177,10 +1180,6 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
          {
             if (png_ptr->transformations & PNG_EXPAND_tRNS)
               info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
-#if 0 /* Removed from libpng-1.2.27 */
-            else
-              info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
-#endif
          }
          if (info_ptr->bit_depth < 8)
             info_ptr->bit_depth = 8;
@@ -1374,12 +1373,12 @@ png_do_read_transformations(png_structp png_ptr)
 #endif
 
 /* From Andreas Dilger e-mail to png-implement, 26 March 1998:
- * 
+ *
  *   In most cases, the "simple transparency" should be done prior to doing
  *   gray-to-RGB, or you will have to test 3x as many bytes to check if a
  *   pixel is transparent.  You would also need to make sure that the
  *   transparency information is upgraded to RGB.
- * 
+ *
  *   To summarize, the current flow is:
  *   - Gray + simple transparency -> compare 1 or 2 gray bytes and composite
  *                                   with background "in place" if transparent,
@@ -4202,7 +4201,7 @@ png_build_gamma_table(png_structp png_ptr)
 
      png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr,
         (png_uint_32)(num * png_sizeof(png_uint_16p)));
-     png_memset(png_ptr->gamma_16_table, 0, num * png_sizeof(png_uint_16p)); 
+     png_memset(png_ptr->gamma_16_table, 0, num * png_sizeof(png_uint_16p));
 
      if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND))
      {
@@ -4264,7 +4263,7 @@ png_build_gamma_table(png_structp png_ptr)
 
         png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr,
            (png_uint_32)(num * png_sizeof(png_uint_16p )));
-        png_memset(png_ptr->gamma_16_to_1, 0, num * png_sizeof(png_uint_16p)); 
+        png_memset(png_ptr->gamma_16_to_1, 0, num * png_sizeof(png_uint_16p));
 
         for (i = 0; i < num; i++)
         {
@@ -4290,7 +4289,7 @@ png_build_gamma_table(png_structp png_ptr)
         png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr,
            (png_uint_32)(num * png_sizeof(png_uint_16p)));
         png_memset(png_ptr->gamma_16_from_1, 0,
-           num * png_sizeof(png_uint_16p)); 
+           num * png_sizeof(png_uint_16p));
 
         for (i = 0; i < num; i++)
         {
diff --git a/src/libpng/pngrutil.c b/src/libpng/pngrutil.c
index ae1e3f7..f656dfb 100644
--- a/src/libpng/pngrutil.c
+++ b/src/libpng/pngrutil.c
@@ -1,12 +1,15 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
+ * Last changed in libpng 1.2.38 [July 16, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file contains routines that are only called from within
  * libpng itself during the course of reading an image.
  */
@@ -2251,7 +2254,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    if (!(png_ptr->chunk_name[0] & 0x20))
    {
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
       if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
            PNG_HANDLE_CHUNK_ALWAYS
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
@@ -2263,8 +2266,11 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-   if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) ||
-       (png_ptr->read_user_chunk_fn != NULL))
+   if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+       || (png_ptr->read_user_chunk_fn != NULL)
+#endif
+        )
    {
 #ifdef PNG_MAX_MALLOC_64K
        if (length > (png_uint_32)65535L)
@@ -2275,7 +2281,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
        }
 #endif
        png_memcpy((png_charp)png_ptr->unknown_chunk.name,
-                  (png_charp)png_ptr->chunk_name, 
+                  (png_charp)png_ptr->chunk_name,
                   png_sizeof(png_ptr->unknown_chunk.name));
        png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] = '\0';
        png_ptr->unknown_chunk.size = (png_size_t)length;
@@ -2298,8 +2304,10 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
           if (ret == 0)
           {
              if (!(png_ptr->chunk_name[0] & 0x20))
+#if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
                 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
                      PNG_HANDLE_CHUNK_ALWAYS)
+#endif
                    png_chunk_error(png_ptr, "unknown critical chunk");
              png_set_unknown_chunks(png_ptr, info_ptr,
                &png_ptr->unknown_chunk, 1);
diff --git a/src/libpng/pngset.c b/src/libpng/pngset.c
index fa68a2d..3c110eb 100644
--- a/src/libpng/pngset.c
+++ b/src/libpng/pngset.c
@@ -1,12 +1,15 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
+ * Last changed in libpng 1.2.39 [August 13, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * The functions here are used during reads to store data from the file
  * into the info struct, and during writes to store application data
  * into the info struct for writing into the file.  This abstracts the
@@ -243,7 +246,7 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
 
    /* Check other values */
    if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
-      bit_depth != 8 && bit_depth != 16)
+       bit_depth != 8 && bit_depth != 16)
       png_error(png_ptr, "Invalid bit depth in IHDR");
 
    if (color_type < 0 || color_type == 1 ||
@@ -354,7 +357,7 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
    if (info_ptr->pcal_purpose == NULL)
    {
-       png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
+      png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
       return;
    }
    png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
@@ -371,7 +374,7 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
    if (info_ptr->pcal_units == NULL)
    {
-       png_warning(png_ptr, "Insufficient memory for pCAL units.");
+      png_warning(png_ptr, "Insufficient memory for pCAL units.");
       return;
    }
    png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
@@ -380,7 +383,7 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
       (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
    if (info_ptr->pcal_params == NULL)
    {
-       png_warning(png_ptr, "Insufficient memory for pCAL params.");
+      png_warning(png_ptr, "Insufficient memory for pCAL params.");
       return;
    }
 
@@ -394,8 +397,8 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
       info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
       if (info_ptr->pcal_params[i] == NULL)
       {
-          png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
-          return;
+         png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
+         return;
       }
       png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
    }
@@ -705,7 +708,8 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 {
    int i;
 
-   png_debug1(1, "in %s storage function", (png_ptr->chunk_name[0] == '\0' ?
+   png_debug1(1, "in %s storage function", ((png_ptr == NULL ||
+      png_ptr->chunk_name[0] == '\0') ?
       "text" : (png_const_charp)png_ptr->chunk_name));
 
    if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
@@ -1013,7 +1017,7 @@ png_set_unknown_chunks(png_structp png_ptr,
    int i;
 
    if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
-       return;
+      return;
 
    np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
        (png_uint_32)((info_ptr->unknown_chunks_num + num_unknowns) *
@@ -1035,8 +1039,8 @@ png_set_unknown_chunks(png_structp png_ptr,
       png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
       png_unknown_chunkp from = unknowns + i;
 
-      png_memcpy((png_charp)to->name, 
-                 (png_charp)from->name, 
+      png_memcpy((png_charp)to->name,
+                 (png_charp)from->name,
                  png_sizeof(from->name));
       to->name[png_sizeof(to->name)-1] = '\0';
       to->size = from->size;
diff --git a/src/libpng/pngtrans.c b/src/libpng/pngtrans.c
index f221f54..6e1870c 100644
--- a/src/libpng/pngtrans.c
+++ b/src/libpng/pngtrans.c
@@ -2,10 +2,13 @@
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
  * Last changed in libpng 1.2.36 [May 14, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
@@ -634,8 +637,8 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
 #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
+    defined(PNG_LEGACY_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
 void PNGAPI
 png_set_user_transform_info(png_structp png_ptr, png_voidp
    user_transform_ptr, int user_transform_depth, int user_transform_channels)
diff --git a/src/libpng/pngwio.c b/src/libpng/pngwio.c
index 740b71d..f77b2db 100644
--- a/src/libpng/pngwio.c
+++ b/src/libpng/pngwio.c
@@ -2,11 +2,14 @@
 /* pngwio.c - functions for data output
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all output.  Users who need
  * special handling are expected to write functions that have the same
  * arguments as these and perform similar functions, but that possibly
diff --git a/src/libpng/pngwrite.c b/src/libpng/pngwrite.c
index bd6263c..0987612 100644
--- a/src/libpng/pngwrite.c
+++ b/src/libpng/pngwrite.c
@@ -2,10 +2,13 @@
 /* pngwrite.c - general routines to write a PNG file
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 /* Get internal access to png.h */
diff --git a/src/libpng/pngwtran.c b/src/libpng/pngwtran.c
index ac56339..88a7d3c 100644
--- a/src/libpng/pngwtran.c
+++ b/src/libpng/pngwtran.c
@@ -2,10 +2,13 @@
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
  * Last changed in libpng 1.2.37 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
diff --git a/src/libpng/pngwutil.c b/src/libpng/pngwutil.c
index 22a83cc..aed280e 100644
--- a/src/libpng/pngwutil.c
+++ b/src/libpng/pngwutil.c
@@ -1,11 +1,14 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * Last changed in libpng 1.2.36 [June 4, 2009]
- * For conditions of distribution and use, see copyright notice in png.h
+ * Last changed in libpng 1.2.39 [August 13, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
@@ -785,6 +788,14 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
           ((*( (png_bytep)profile + 2))<< 8) |
           ((*( (png_bytep)profile + 3))    );
 
+   if (embedded_profile_len < 0)
+   {
+      png_warning(png_ptr,
+        "Embedded profile length in iCCP chunk is negative");
+      png_free(png_ptr, new_name);
+      return;
+   }
+
    if (profile_len < embedded_profile_len)
    {
       png_warning(png_ptr,
@@ -988,7 +999,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
 #endif
    {
       /* Each value is saved in 1/100,000ths */
-    
+
       png_save_uint_32(buf, int_white_x);
       png_save_uint_32(buf + 4, int_white_y);
 
@@ -2116,9 +2127,12 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
    png_uint_32 mins, bpp;
    png_byte filter_to_do = png_ptr->do_filter;
    png_uint_32 row_bytes = row_info->rowbytes;
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
    int num_p_filters = (int)png_ptr->num_prev_filters;
-#endif
+#endif 
+
+   png_debug(1, "in png_write_find_filter");
+
 
    png_debug(1, "in png_write_find_filter");
    /* Find out how many bytes offset each pixel is */