[master] Imported from libpng-1.2.41beta02.tar

[master] Add a test to make sure the user isn't trying to stuff height into
a 16-bit int (assuming height immediately follows width).
2025-07-10 18:04:09 +02:00 · 2009-09-30 13:40:53 -05:00 · 2009-09-30 13:38:37 -05:00 · 2009-09-25 14:21:52 -05:00 · 2009-09-25 14:11:33 -05:00 · 2009-09-25 12:07:58 -05:00
124 changed files with 26429 additions and 28047 deletions
--- a/50
+++ b/50
@@ -1,52 +1,56 @@

-Libpng 1.2.23 - November 6, 2007
+Libpng 1.2.41beta02 - September 30, 2009

-This is a public release of libpng, intended for use in production codes.
+This is not intended to be a public release.  It will be replaced
+within a few weeks by a public version or by another test version.

 Files available for download:

 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script

-   libpng-1.2.23.tar.gz
-   libpng-1.2.23.tar.bz2
+   libpng-1.2.41beta02.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.41beta02.tar.gz
+   libpng-1.2.41beta02.tar.bz2

 Source files with LF line endings (for Unix/Linux) without the
 "configure" script

-   libpng-1.2.23-no-config.tar.gz
-   libpng-1.2.23-no-config.tar.bz2
+   libpng-1.2.41beta02-no-config.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.41beta02-no-config.tar.gz
+   libpng-1.2.41beta02-no-config.tar.bz2

 Source files with CRLF line endings (for Windows), without the
 "configure" script

-   lpng1223.zip
-   lpng1223.tar.bz2
+   lp1241b02.zip
+   lp1241b02.7z
+   lp1241b02.tar.bz2

 Project files

-   libpng-1.2.23-project-netware.zip
-   libpng-1.2.23-project-wince.zip
+   libpng-1.2.41beta02-project-netware.zip
+   libpng-1.2.41beta02-project-wince.zip

 Other information:

-   libpng-1.2.23-README.txt
-   libpng-1.2.23-KNOWNBUGS.txt
-   libpng-1.2.23-LICENSE.txt
-   libpng-1.2.23-Y2K-compliance.txt
+   libpng-1.2.41beta02-README.txt
+   libpng-1.2.41beta02-KNOWNBUGS.txt
+   libpng-1.2.41beta02-LICENSE.txt
+   libpng-1.2.41beta02-Y2K-compliance.txt
+   libpng-1.2.41beta02-[previous version]-diff.txt

-Changes since the last public release (1.2.22):
+Changes since the last public release (1.2.40):

-version 1.2.23 [November 6, 2007]
-
-  Reduced number of invocations of png_strlen() in pngset.c.
-  Changed [azAZ09_] to [_abcde...89] in Makefile.am for better localization.
-  Eliminated png_strncpy() and png_strcpy() (Pierre Poissinger)
-  Reject attempt to set all-zero cHRM values.
-  Add missing quotes in projects/visualc6 that were lost in version 1.2.20
+version 1.2.41beta01 [September 30, 2009]
+  Moved redundant IHDR checking into new png_check_IHDR() in png.c
+    and report all errors found in the IHDR data.
+  Eliminated useless call to png_check_cHRM() from pngset.c
+  Expanded TAB characters in pngrtran.c

 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
-(subscription required; visit 
+
+(subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
 to subscribe) or to glennrp at users.sourceforge.net

--- a/499
+++ b/499
@@ -1,4 +1,4 @@
-
+/*
 CHANGES - changes for libpng

 version 0.2
@@ -539,7 +539,8 @@ version 1.0.5d [November 29, 1999]
  Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
  Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
    to applications a macro "PNG_USE_LOCAL_ARRAYS".
-  #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
+  Remove all the new declarations with #ifdef/#endif when
+    PNG_USE_GLOBAL_ARRAYS is defined.
  Added PNG_EXPORT_VAR macro to accommodate making DLL's.
 version 1.0.5e [November 30, 1999]
  Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
@@ -1179,7 +1180,7 @@ version 1.2.4beta3 [June 28, 2002]
  Plugged memory leak of row_buf in pngtest.c when there is a png_error().
  Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
  Added "test-installed" target to makefile.32sunu, makefile.64sunu,
-    makefile.beos, makefile.darwin, makefile.dec, makefile.macosx, 
+    makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
    makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
 version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
  Added "test-installed" target to makefile.cygwin and makefile.sco.
@@ -1300,7 +1301,7 @@ version 1.2.6beta4 [July 28, 2004]
  Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
    sequential read support.
  Added some "#if PNG_WRITE_SUPPORTED" blocks.
-  #ifdef'ed out some redundancy in png_malloc_default().
+  Removed some redundancy with #ifdef/#endif in png_malloc_default().
  Use png_malloc instead of png_zalloc to allocate the pallete.
 version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
  Fixed buffer overflow vulnerability in png_handle_tRNS()
@@ -1370,7 +1371,8 @@ version 1.2.8beta1 [November 1, 2004]
  Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
    strip alpha operation in png_do_strip_filler().
  Added PNG_1_2_X definition in pngconf.h
-  #ifdef out png_info_init in png.c and png_read_init in pngread.c (as of 1.3.0)
+  Comment out with #ifdef/#endif png_info_init in png.c and png_read_init
+    in pngread.c (as of 1.3.0)
 version 1.2.8beta2 [November 2, 2004]
  Reduce color_type to a nonalpha type after strip alpha operation in
    png_do_strip_filler().
@@ -1387,7 +1389,7 @@ version 1.2.8beta5 [November 20, 2004]
  Use png_ptr->flags instead of png_ptr->transformations to pass
    PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
    compatibility.
-  Revised handling of SPECIALBUILD, PRIVATEBUILD, 
+  Revised handling of SPECIALBUILD, PRIVATEBUILD,
    PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
 version 1.2.8rc1 [November 24, 2004]
  Moved handling of BUILD macros from pngconf.h to png.h
@@ -1480,7 +1482,7 @@ version 1.2.9beta5 [March 4, 2006]
  Restored scripts/makefile.elf which was inadvertently deleted.

 version 1.2.9beta6 [March 6, 2006]
-  Fixed typo (23) in configuration files.
+  Fixed typo (RELEASE) in configuration files.

 version 1.2.9beta7 [March 7, 2006]
  Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in Makefile.am
@@ -1669,7 +1671,7 @@ version 1.2.15rc2 [December 21, 2006]
  Added scripts/makefile.nommx

 version 1.2.15rc3 [December 25, 2006]
-  Fixed shared library numbering error that was intruduced in 1.2.15beta6.
+  Fixed shared library numbering error that was introduced in 1.2.15beta6.

 version 1.2.15rc4 [December 27, 2006]
  Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set.
@@ -1685,14 +1687,14 @@ version 1.2.16beta1 [January 6, 2007]

 version 1.2.16beta2 [January 16, 2007]
  Revised scripts/CMakeLists.txt
- 
+
 version 1.0.24, 1.2.16 [January 31, 2007]
  No changes.
- 
+
 version 1.2.17beta1 [March 6, 2007]
  Revised scripts/CMakeLists.txt to install both shared and static libraries.
  Deleted a redundant line from pngset.c.
- 
+
 version 1.2.17beta2 [April 26, 2007]
  Relocated misplaced test for png_ptr == NULL in pngpread.c
  Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
@@ -1713,7 +1715,7 @@ version 1.2.17rc2 [May 8, 2007]
  Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
    can be free'ed in case of error.  Revised unknown chunk handling in
    pngrutil.c and pngpread.c to use this structure.
- 
+
 version 1.2.17rc3 [May 8, 2007]
  Revised symbol-handling in configure script.

@@ -1756,9 +1758,9 @@ version 1.2.19beta6 [May 22, 2007]
  Added a special "_MSC_VER" case that defines png_snprintf to _snprintf

 version 1.2.19beta7 [May 22, 2007]
-  Squelched png_squelch_warnings() in pnggccrd.c and added an
-    #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
-    the warnings that png_squelch_warnings was squelching.
+  Squelched png_squelch_warnings() in pnggccrd.c and added
+    an #ifdef PNG_MMX_CODE_SUPPORTED/#endif block around the declarations
+    that caused the warnings that png_squelch_warnings was squelching.

 version 1.2.19beta8 [May 22, 2007]
  Removed __MMX__ from test in pngconf.h.
@@ -1897,6 +1899,7 @@ version 1.0.27 and 1.2.19 [August 18, 2007]

 version 1.2.20beta01 [August 19, 2007]
  Fixed problem with compiling pnggccrd.c on Intel-Apple platforms.
+  Changed png_malloc() to png_malloc_warn() in png_set_sPLT().
  Added PNG_NO_ERROR_TEXT feature, with demo in contrib/pngminim
  Removed define PNG_WARN_UNINITIALIZED_ROW 1 /* 0: warning; 1: error */
    because it caused some trouble.
@@ -2010,6 +2013,471 @@ version 1.2.23rc01 [November 2, 2007]
 version 1.2.23 [November 6, 2007]
  No changes.

+version 1.2.24beta01 [November 19, 2007]
+  Moved misplaced test for malloc failure in png_set_sPLT().  This bug was
+    introduced in libpng-1.2.20beta01.
+  Ifdef out avg_row etc from png.h and pngwrite.c when PNG_NO_WRITE_FILTER
+  Do not use png_ptr->free_fn and png_ptr->mem_fn in png_destroy_read_struct()
+    when png_ptr is NULL (Marshall Clow).
+  Updated handling of symbol prefixes in Makefile.am and configure.ac (Mike
+    Frysinger).
+
+version 1.2.24beta02 [November 30, 2007]
+  Removed a useless test and fixed incorrect test in png_set_cHRM_fixed()
+    (David Hill).
+
+version 1.2.24rc01 [December 7, 2007]
+  No changes.
+
+version 1.2.24     [December 14, 2007]
+  Make sure not to redefine _BSD_SOURCE in pngconf.h
+  Revised gather.sh and makefile.std in contrib/pngminim to avoid compiling
+    unused files.
+
+version 1.2.25beta01 [January 7, 2008]
+  Fixed bug with unknown chunk handling, introduced in version 1.2.17rc2
+
+version 1.2.25beta02 [January 10, 2008]
+  Prevent gamma from being applied twice.
+
+version 1.2.25rc01 [January 17, 2008]
+  No changes.
+
+version 1.2.25beta03 [January 22, 2008]
+  Fixed some continue-after-malloc-failure errors in pngset.c (David Hill)
+  Check for info_ptr == NULL in png_read_info() and png_process_data().
+  Check for possible use of NULL user_png_ver[] in png_create_read_struct().
+  Change "if (swidth == NULL)" to "if (sheight == NULL)" in png_handle_sCAL
+    (bug introduced in libpng-1.2.4/1.0.13).
+  Return from png_destroy_read_struct() if png_ptr_ptr is NULL.
+  Fix overflow of "msg" in png_decompress_chunk().
+
+version 1.2.25beta04 [January 26, 2008]
+  Work around Coverity bug report by slightly refactoring
+    png_read_push_finish_row()
+
+version 1.2.25beta05 [January 31, 2008]
+  Added libpng-1.2.25beta05.tar.lzma to distribution.  Get the lzma codec
+    from <http://tukaani.org/lzma>.
+  Added lp1225b05.7z to distribution.  Get the 7-zip decoder from
+    from <http://www.7-zip.org>.
+  Fixed some broken links in the README file.
+
+version 1.2.25beta06 [February 6, 2008]
+  Refactored png_read_push_finish_row() again, trying to satisfy Coverity.
+  Fixed potential NULL dereference of png_ptr in png_destroy_write_struct();
+  clarified potential NULL dereference of png_ptr in png_destroy_read_struct();
+  fixed potential NULL dereference of info_ptr in png_handle_bKGD();
+  fixed potential NULL dereference of user_png_ver[] in
+    png_create_write_struct_2(). (Coverity)
+
+version 1.2.25rc02 [February 10, 2008]
+  Reset png_ptr->pass in png_read_push_finish_row() before break.
+  Changed "pass" from png_byte to int.
+
+version 1.2.25 and 1.0.31 [February 18, 2008]
+  No changes.
+
+version 1.2.26beta01 [February 21, 2008]
+  Added missing "(" in pngmem.c.  Bug introduced in libpng-1.2.2/1.0.13
+
+version 1.2.26beta02 [March 12, 2008]
+  Refined error message returned from deflateInit2 in pngwutil.c
+  Check IHDR length in png_push_read_chunk() before saving it.
+
+version 1.2.26beta03 [March 16, 2008]
+  Revised contrib/gregbook to handle premature end-of-file and file
+    read errors correctly.
+
+version 1.2.26beta04 [March 18, 2008]
+  Free png_ptr->big_row_buf and png_ptr->prev_row before allocating
+    new copies in png_read_start_row().  Bug introduced in libpng-1.2.22.
+
+version 1.2.26beta05 [March 19, 2008]
+  Removed extra png_free() added in libpng-1.2.26beta04.
+
+version 1.2.26beta06 [March 19, 2008]
+  Avoid reallocating big_row_buf and prev_row when the size does not increase.
+
+version 1.2.26rc01 [March 26, 2008]
+  Ifdef out some code that is unused when interlacing is not supported.
+
+versions 1.0.32 and 1.2.26 [April 2, 2008]
+  No changes.
+
+version 1.2.27beta01 [April 12, 2008]
+  Fixed bug (introduced in libpng-1.0.5h) with handling zero-length
+    unknown chunks.
+  Added more information about png_set_keep_unknown_chunks() to the
+    documentation.
+  Reject tRNS chunk with out-of-range samples instead of masking off
+    the invalid high bits as done in since libpng-1.2.19beta5.
+
+version 1.2.27beta02 [April 13, 2008]
+  Revised documentation about unknown chunk and user chunk handling.
+  Keep tRNS chunk with out-of-range samples and issue a png_warning().
+
+version 1.2.27beta03 [April 14, 2008]
+  Added check for NULL ptr in TURBOC version of png_free_default().
+  Removed several unnecessary checks for NULL before calling png_free().
+  Revised png_set_tRNS() so that calling it twice removes and invalidates
+    the previous call.
+  Revised pngtest to check for out-of-range tRNS samples.
+
+version 1.2.27beta04 [April 18, 2008]
+  Added AC_LIBTOOL_WIN32_DLL to configure.ac
+  Rebuilt Makefile.in, aclocal.m4, and configure with autoconf-2.62
+
+version 1.2.27beta05 [April 19, 2008]
+  Added MAINTAINERCLEANFILES variable to Makefile.am
+
+version 1.2.27beta06 [April 21, 2008]
+  Avoid changing color_type from GRAY to RGB by
+    png_set_expand_gray_1_2_4_to_8().
+
+version 1.2.27rc01 [April 23, 2008]
+  Fix broken URL for rfc2083 in png.5 and libpng-*.txt
+
+version 1.0.33 and 1.2.27 [April 30, 2008]
+  No changes.
+
+version 1.0.34 and 1.2.28 [April 30, 2008]
+  Rebuilt Makefile.in, aclocal.m4, and configure with autoconf-2.61
+    due to backward incompatibilities.
+  Removed a stray object file from contrib/gregbook
+
+version 1.2.29beta01 [May 1, 2008]
+  Removed some stray *.diff and *.orig files
+
+version 1.2.29beta02 [May 1, 2008]
+  Reverted Makefile.in, aclocal.m4, and configure to the libpng-1.2.26
+    versions.
+
+version 1.2.29beta03 [May 2, 2008]
+  Added --force to autogen libtoolize options and --force-missing to
+    automake options.
+  Changed $(ECHO) to echo in Makefile.am and Makefile.in
+  Updated all configure files to autoconf-2.62
+  Comment out pnggcrd.c code with #ifdef/#endif if using MSC_VER
+
+version 1.2.29rc01 [May 4, 2008]
+  No changes.
+
+version 1.0.35 and 1.2.29 [May 8, 2008]
+  No changes.
+
+version 1.0.37 [May 9, 2008]
+  Updated Makefile.in and configure (omitted version 1.0.36).
+
+version 1.2.30beta01 [May 29, 2008]
+  Updated libpng.pc-configure.in and libpng-config.in per debian bug reports.
+
+version 1.2.30beta02 [June 25, 2008]
+  Restored png_flush(png_ptr) at the end of png_write_end(), that was
+    removed from libpng-1.0.9beta03.
+
+version 1.2.30beta03 [July 6, 2008]
+  Merged some cosmetic whitespace changes from libpng-1.4.0beta19.
+  Inline call of png_get_uint_32() in png_get_uint_31(), as in 1.4.0beta19.
+  Added demo of decoding vpAg and sTER chunks to pngtest.c, from 1.4.0beta19.
+  Changed PNGMAJ from 0 to 12 in makefile.darwin, which does not like 0.
+  Added new private function png_read_chunk_header() from 1.4.0beta19.
+  Merge reading of chunk length and chunk type into a single 8-byte read.
+  Merge writing of chunk length and chunk type into a single 8-byte write.
+
+version 1.2.30beta04 [July 10, 2008]
+  Merged more cosmetic whitespace changes from libpng-1.4.0beta19.
+
+version 1.0.38rc01, 1.2.30rc01 [July 18, 2008]
+  No changes.
+
+version 1.0.38rc02, 1.2.30rc02 [July 21, 2008]
+  Moved local array "chunkdata" from pngrutil.c to the png_struct, so
+    it will be freed by png_read_destroy() in case of a read error (Kurt
+    Christensen).
+
+version 1.0.38rc03, 1.2.30rc03 [July 21, 2008]
+  Changed "purpose" and "buffer" to png_ptr->chunkdata to avoid memory leaking.
+
+version 1.0.38rc04, 1.2.30rc04 [July 22, 2008]
+  Changed "chunkdata = NULL" to "png_ptr->chunkdata = NULL" several places in
+    png_decompress_chunk().
+
+version 1.0.38rc05, 1.2.30rc05 [July 25, 2008]
+  Changed all remaining "chunkdata" to "png_ptr->chunkdata" in
+    png_decompress_chunk() and remove chunkdata from parameter list.
+  Put a call to png_check_chunk_name() in png_read_chunk_header().
+  Revised png_check_chunk_name() to reject a name with a lowercase 3rd byte.
+  Removed two calls to png_check_chunk_name() occuring later in the process.
+
+version 1.0.38rc06, 1.2.30rc06 [July 29, 2008]
+  Added a call to png_check_chunk_name() in pngpread.c
+  Reverted png_check_chunk_name() to accept a name with a lowercase 3rd byte.
+
+version 1.0.38r07, 1.2.30r07 [August 2, 2008]
+  Changed "-Wall" to "-W -Wall" in the CFLAGS in all makefiles (Cosmin Truta)
+  Declared png_ptr "volatile" in pngread.c and pngwrite.c to avoid warnings.
+  Added code in pngset.c to quiet compiler warnings.
+  Updated contrib/visupng/cexcept.h to version 2.0.1
+  Relocated a misplaced "#endif /* PNG_NO_WRITE_FILTER */" in pngwutil.c
+
+version 1.0.38r08, 1.2.30r08 [August 2, 2008]
+  Enclose "volatile" declarations in #ifdef PNG_SETJMP_SUPPORTED (Cosmin).
+
+version 1.0.38, 1.2.30 [August 14, 2008]
+  No changes.
+
+version 1.2.31rc01 [August 19, 2008]
+  Removed extra crc check at the end of png_handle_cHRM().  Bug introduced
+    in libpng-1.2.30beta03 (Heiko Nitzsche).
+
+version 1.2.31rc02 [August 19, 2008]
+  Added PNG_WRITE_FLUSH_SUPPORTED block around new png_flush() call.
+
+version 1.2.31rc03 [August 19, 2008]
+  Added PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED block, off by default, around
+    new png_flush().
+
+version 1.0.39, 1.2.31 [August 21, 2008]
+  No changes.
+
+version 1.2.32beta01 [September 6, 2008]
+  Shortened tIME_string to 29 bytes in pngtest.c (bug introduced in
+    libpng-1.2.22).
+  Fixed off-by-one error introduced in png_push_read_zTXt() function in
+    libpng-1.2.30beta04/pngpread.c (Harald van Dijk)
+  These bugs have been given the vulnerability id CVE-2008-3964.
+
+version 1.0.40, 1.2.32 [September 18, 2008]
+  No changes.
+
+version 1.2.33beta01 [October 6, 2008]
+  Revised makefile.darwin to fix shared library numbering.
+  Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8()
+    in example.c (debian bug report)
+
+version 1.2.33rc01 [October 15, 2008]
+  No changes.
+
+version 1.0.41rc01, version 1.2.33rc02 [October 23, 2008]
+  Changed remaining "key" to "png_ptr->chunkdata" in png_handle_tEXt()
+    to avoid memory leak after memory failure while reading tEXt chunk.`
+
+version 1.2.33 [October 31, 2008]
+  No changes.
+
+version 1.2.34beta01 [November 27, 2008]
+  Revised png_warning() to write its message on standard output by default
+    when warning_fn is NULL. This was the behavior prior to libpng-1.2.9beta9.
+  Fixed string vs pointer-to-string error in png_check_keyword().
+  Added png_check_cHRM_fixed() in png.c and moved checking from pngget.c,
+    pngrutil.c, and pngwrite.c, and eliminated floating point cHRM checking.
+  Added check for zero-area RGB cHRM triangle in png_check_cHRM_fixed().
+  In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant
+    check for all-zero coordinates that is detected by the triangle check.
+  Revised png_warning() to write its message on standard output by default
+    when warning_fn is NULL.
+
+version 1.2.34beta02 [November 28, 2008]
+  Corrected off-by-one error in bKGD validity check in png_write_bKGD()
+    and in png_handle_bKGD().
+
+version 1.2.34beta03 [December 1, 2008]
+  Revised bKGD validity check to use >= x instead of > x + 1
+  Merged with png_debug from libpng-1.4.0 to remove newlines.
+
+version 1.2.34beta04 [December 2, 2008]
+  More merging with png_debug from libpng-1.4.0 to remove newlines.
+
+version 1.2.34beta05 [December 5, 2008]
+  Removed redundant check for key==NULL before calling png_check_keyword()
+    to ensure that new_key gets initialized and removed extra warning
+    (Arvan Pritchard).
+
+version 1.2.34beta06 [December 9, 2008]
+  In png_write_png(), respect the placement of the filler bytes in an earlier
+    call to png_set_filler() (Jim Barry).
+
+version 1.2.34beta07 [December 9, 2008]
+  Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and
+    PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated
+    PNG_TRANSFORM_STRIP_FILLER (Jim Barry).
+
+version 1.0.42rc01, 1.2.34rc01 [December 11, 2008]
+  No changes.
+
+version 1.0.42, 1.2.34 [December 18, 2008]
+  No changes.
+
+version 1.2.35beta01 [February 4, 2009]
+  Zero out some arrays of pointers after png_malloc(). (Tavis Ormandy)
+
+version 1.2.35beta02 [February 4, 2009]
+  Zero out more arrays of pointers after png_malloc().
+
+version 1.2.35beta03 [February 5, 2009]
+  Use png_memset() instead of a loop to intialize pointers.  We realize
+    this will not work on platforms where the NULL pointer is not all zeroes.
+
+version 1.2.35rc01 [February 11, 2009]
+  No changes.
+
+version 1.2.35rc02 [February 12, 2009]
+  Fix typo in new png_memset call in pngset.c (png_color should be png_charp)
+
+version 1.0.43 and 1.2.35 [February 14, 2009]
+  No changes.
+
+version 1.2.36beta01 [February 28, 2009]
+  Revised comments in png_set_read_fn() and png_set_write_fn().
+  Revised order of #ifdef's and indentation in png_debug definitions of png.h
+    bug introduced in libpng-1.2.34.
+
+version 1.2.36beta02 [March 21, 2009]
+  Use png_memset() after png_malloc() of big_row_buf when reading an
+    interlaced file, to avoid a possible UMR.
+  Undid recent revision of PNG_NO_STDIO version of png_write_flush().  Users
+    having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined.
+  Revised libpng*.txt documentation about use of png_write_flush().
+  Removed fflush() from pngtest.c.
+  Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
+
+version 1.2.36beta03 [March 27, 2009]
+  Relocated misplaced PNG_1_0_X define in png.h that caused the prototype
+    for png_set_strip_error_numbers() to be omitted from PNG_NO_ASSEMBLER_CODE
+    builds.  This bug was introduced in libpng-1.2.15beta4.
+  Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt
+
+version 1.2.36beta04 [April 5, 2009]
+  Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles)
+
+version 1.2.36beta05 [April 24, 2009]
+  Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
+    application code writers to bypass the check for multiple inclusion
+    of setjmp.h when they know that it is safe to ignore the situation.
+  Made some cosmetic changes to whitespace in pngtest output.
+  Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
+    "shadowed declaration" warning from gcc-4.3.3.
+  Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
+    warning about a global "gamma" variable in math.h on some platforms.
+
+version 1.2.36rc01 [April 30, 2009]
+  No changes.
+
+version 1.0.44 and 1.2.36 [May 7, 2009]
+  No changes.
+
+version 1.2.37beta01 [May 14, 2009]
+  Fixed inconsistency in pngrutil.c, introduced in libpng-1.2.36.  The
+    memset() was using "png_ptr->rowbytes" instead of "row_bytes", which
+    the corresponding png_malloc() uses (Joe Drew).
+  Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
+  Updated some of the makefiles in the scripts directory (merged with
+    those in libpng-1.4.0beta57).
+
+version 1.2.37beta02 [May 19, 2009]
+  Fixed typo in libpng documentation (FILTER_AVE should be FILTER_AVG)
+  Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
+  Conditionally compile png_read_finish_row() which is not used by
+    progressive readers.
+  Added contrib/pngminim/preader to demonstrate building minimal progressive
+    decoder, based on contrib/gregbook with embedded libpng and zlib.
+
+version 1.2.37beta03 [May 20, 2009]
+  In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there
+    is only one makefile in those directories, and revised the README files
+    accordingly.
+  Reformated sources in libpng style (3-space indentation, comment format)
+
+version 1.2.37rc01 [May 27, 2009]
+  No changes.
+
+versions 1.2.37 and 1.0.45 [June 4, 2009]
+  Reformatted several remaining "else statement;" and "if () statement;" into
+    two lines.
+  Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
+    and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
+  Added sections about the git repository and our coding style to the
+    documentation (merged from libpng-1.4.0beta62)
+  Added a section to the libpng documentation about using png_get_io_ptr()
+    in configure scripts to detect the presence of libpng.
+
+version 1.2.38beta01 [June 17, 2009]
+  Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
+    multiple times and to specify the sample order in the tRNS chunk,
+    because the ISO PNG specification has a typo in the tRNS table.
+  Changed several PNG_UNKNOWN_CHUNK_SUPPORTED to
+    PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
+    available for ignoring known chunks even when not saving unknown chunks.
+  Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
+    "#if defined()" and "if !defined()" where possible.
+  Added PNG_NO_HANDLE_AS_UNKNOWN in the PNG_LEGACY_SUPPORTED block of
+    pngconf.h, and moved the various unknown chunk macro definitions
+    outside of the PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
+
+version 1.0.46 [June 18, 2009]
+  Removed some editing cruft from scripts/libpng.pc.in and some makefiles.
+
+version 1.2.38rc01 [June 24, 2009]
+  No changes.
+
+version 1.2.38rc02 [June 29, 2009]
+  Added a reference to the libpng license in each source file.
+
+version 1.2.38rc03 [July 11, 2009]
+  Revised references to the libpng license in pngconf.h and contrib/visupng
+    source files.
+  Rebuilt configure scripts with autoconf-2.63.
+
+version 1.0.47 and 1.2.38 [July 16, 2009]
+  No changes.
+
+version 1.2.39beta01 [July 25, 2009]
+  Added a prototype for png_64bit_product() in png.c
+
+version 1.2.39beta02 [July 27, 2009]
+  Avoid a possible NULL dereference in debug build, in png_set_text_2().
+    (bug introduced in libpng-0.95, discovered by Evan Rouault)
+
+version 1.2.39beta03 [July 29, 2009]
+  Relocated new png_64_bit_product() prototype into png.h
+  Expanded the information about prototypes in the libpng style section of
+    the documentation.
+  Rebuilt configure scripts with autoconf-2.64.
+
+version 1.2.39beta04 [August 1, 2009]
+  Replaced *.tar.lzma with *.txz in distribution.  Get the xz codec
+    from <http://tukaani.org/xz>.
+
+version 1.2.39beta05 [August 1, 2009]
+  Reject attempt to write iCCP chunk with negative embedded profile length
+    (JD Chen)
+
+version 1.2.39c01 [August 6, 2009]
+  No changes.
+
+version 1.2.39 and 1.0.48 [August 13, 2009]
+  No changes.
+
+version 1.2.40beta01 [August 20, 2009]
+  Removed an extra png_debug() recently added to png_write_find_filter().
+  Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.
+
+version 1.2.40rc01 [September 2, 2009]
+  Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
+
+version 1.2.40 and 1.0.49 [September 30, 2009]
+  No changes.
+
+version 1.0.50 [September 10, 2009]
+  Removed some editing cruft from pngset.c and pngwutil.c.
+
+version 1.2.41beta01 [September 30, 2009]
+  Moved redundant IHDR checking into new png_check_IHDR() in png.c
+    and report all errors found in the IHDR data.
+  Eliminated useless call to png_check_cHRM() from pngset.c
+  Expanded TAB characters in pngrtran.c
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
@@ -2017,3 +2485,4 @@ to subscribe)
 or to glennrp at users.sourceforge.net

 Glenn R-P
+*/
--- a/16
+++ b/16
@@ -1,5 +1,5 @@

-Installing libpng version 1.2.23 - November 6, 2007
+Installing libpng version 1.2.41beta02 - September 30, 2009

 On Unix/Linux and similar systems, you can simply type

@@ -44,7 +44,7 @@ to have access to the zlib.h and zconf.h include files that
 correspond to the version of zlib that's installed.

 You can rename the directories that you downloaded (they
-might be called "libpng-1.2.23" or "lpng109" and "zlib-1.2.1"
+might be called "libpng-1.2.41beta02" or "lpng109" and "zlib-1.2.1"
 or "zlib121") so that you have directories called "zlib" and "libpng".

 Your directory structure should look like this:
@@ -101,9 +101,9 @@ include
 CMakeLists.txt    =>  "cmake" script
 makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
 makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng12.so.0.1.2.23)
+                       gcc, creates libpng12.so.0.1.2.41beta02)
 makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.23)
+                       (gcc, creates libpng12.so.0.1.2.41beta02)
 makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
 makefile.knr      =>  Archaic UNIX Makefile that converts files with
                       ansi2knr (Requires ansi2knr.c from
@@ -125,14 +125,14 @@ include
 makefile.openbsd  =>  OpenBSD makefile
 makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
 makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.23)
+                       creates libpng12.so.0.1.2.41beta02)
 makefile.sunos    =>  Sun makefile
 makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.23)
+                       creates libpng12.so.0.1.2.41beta02)
 makefile.solaris-x86 =>  Solaris/intelMMX 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.23)
+                       creates libpng12.so.0.1.2.41beta02)
 makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.23)
+                       creates libpng12.so.0.1.2.41beta02)
 makefile.32sunu   =>  Sun Ultra 32-bit makefile
 makefile.64sunu   =>  Sun Ultra 64-bit makefile
 makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
--- a/6
+++ b/6
@@ -1,10 +1,10 @@

-Known bugs in libpng version 1.2.23
+Known bugs in libpng version 1.2.41beta02

 1. February 23, 2006: The custom makefiles don't build libpng with -lz.

   STATUS: This is a subject of debate. The change will probably be made
-   as a part of a major overhaul of the makefiles in libpng version 1.3.0.
+   as a part of a major overhaul of the makefiles in libpng version 1.4.0.

 2. February 24, 2006: The Makefile generated by the "configure" script
   fails to install symbolic links
@@ -15,7 +15,7 @@ Known bugs in libpng version 1.2.23

   STATUS: workarounds are
      1) Compile without optimization (crashes are observed with
-         -arch i386 and -O2 or -O3, using gcc-4.0.1.
+         -arch i386 and -O2 or -O3, using gcc-4.0.1).
      2) Compile pngtest.c with PNG_DEBUG defined (the bug goes away if
         you try to look at it).
      3) Ignore the crash.  The library itself seems to be OK.
--- a/8
+++ b/8
@@ -8,8 +8,10 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 If you modify libpng you may insert additional notices immediately following
 this sentence.

-libpng versions 1.2.6, August 15, 2004, through 1.2.23, November 6, 2007, are
-Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.2.41beta02, September 30, 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

@@ -106,4 +108,4 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-November 6, 2007
+September 30, 2009
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,9 +2,9 @@
 #   Source file for Makefile.in (and hence Makefile)
 #
 # Makefile.am need only be changed on a major version number
-# change (e.g. libpng12 --> libpng13).  In that case seach
+# change (e.g. libpng12 --> libpng14).  In that case seach
 # this file for every instance of the old base name (libpng12)
-# and change to the new one (libpng13), then change the
+# and change to the new one (libpng14), then change the
 # -version-number settings below so that the new values have
 # the correct major part (first field).

@@ -86,11 +86,14 @@ EXTRA_DIST= \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng.txt pngvcrd.c 
+	example.c libpng-1.2.41beta02.txt pngvcrd.c 

 CLEANFILES= pngout.png libpng12.pc libpng12-config libpng.vers \
 libpng.sym

+MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
+config.sub configure depcomp install-sh ltmain.sh missing
+
 $(PNGLIB_BASENAME).pc: libpng.pc
 	cp libpng.pc $@

@@ -101,16 +104,16 @@ libpng.sym: png.h pngconf.h
 	rm -f $@ $@.new
 	$(CPP) @LIBPNG_DEFINES@ $(CPPFLAGS) -DPNG_BUILDSYMS $(srcdir)/png.h | \
 		$(SED) -n -e \
-                's|^.*PNG_FUNCTION_EXPORT[ 	]*\([$(AN)]*\).*$$|\1|p' \
-		-e 's|^.*PNG_DATA_EXPORT[ 	]*\([$(AN)]*\).*$$|\1|p' \
+		's|^.*PNG_FUNCTION_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
+		-e 's|^.*PNG_DATA_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
 			>$@.new
 	mv $@.new $@

 libpng.vers: libpng.sym
 	rm -f $@ $@.new
-	$(ECHO) PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0 '{global:' > $@.new
+	echo PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0 '{global:' > $@.new
 	$(SED) s/$$/\;/ libpng.sym >> $@.new
-	$(ECHO) 'local: *; };' >> $@.new
+	echo 'local: *; };' >> $@.new
 	mv $@.new $@

 test: check
--- a/Makefile.in
+++ b/Makefile.in
--- a/38
+++ b/38
@@ -1,11 +1,15 @@
-README for libpng version 1.2.23 - November 6, 2007 (shared library 12.0)
+README for libpng version 1.2.41beta02 - September 30, 2009 (shared library 12.0)
 See the note about version numbers near the top of png.h

 See INSTALL for instructions on how to install libpng.

-Libpng comes in several distribution formats.  Get libpng-*.tar.gz
-or libpng-*.tar.bz2 if you want UNIX-style line endings in the text
-files, or lpng*.zip if you want DOS-style line endings.
+Libpng comes in several distribution formats.  Get libpng-*.tar.gz,
+libpng-*.tar.lzma, or libpng-*.tar.bz2 if you want UNIX-style line
+endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style
+line endings.  You can get UNIX-style line endings from the *.zip file
+by using "unzip -a" but there seems to be no simple way to recover
+UNIX-style line endings from the *.7z file.  The *.tar.lzma file is
+recommended for *NIX users instead.

 Version 0.89 was the first official release of libpng.  Don't let the
 fact that it's the first release fool you.  The libpng library has been in
@@ -54,7 +58,7 @@ to set different actions based on whether the CRC error occurred in a
 critical or an ancillary chunk.

 The changes made to the library, and bugs fixed are based on discussions
-on the PNG-implement mailing list
+on the png-mng-implement mailing list
 and not on material submitted privately to Guy, Andreas, or Glenn.  They will
 forward any good suggestions to the list.

@@ -77,12 +81,12 @@ compression library that is useful for more things than just PNG files.
 You can use zlib as a drop-in replacement for fread() and fwrite() if
 you are so inclined.

-zlib should be available at the same place that libpng is, or at.
-ftp://ftp.info-zip.org/pub/infozip/zlib
+zlib should be available at the same place that libpng is, or at
+ftp://ftp.simplesystems.org/pub/png/src/

 You may also want a copy of the PNG specification.  It is available
 as an RFC, a W3C Recommendation, and an ISO/IEC Standard.  You can find
-these at http://www.libpng.org/pub/png/documents/
+these at http://www.libpng.org/pub/png/pngdocs.html

 This code is currently being archived at libpng.sf.net in the
 [DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT)
@@ -110,14 +114,14 @@ to subscribe) or to glennrp at users.sourceforge.net

 You can't reach Guy, the original libpng author, at the addresses
 given in previous versions of this document.  He and Andreas will read mail
-addressed to the png-implement list, however.
+addressed to the png-mng-implement list, however.

 Please do not send general questions about PNG.  Send them to
 the (png-mng-misc at lists.sourceforge.net, subscription required, visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe)
 On the other hand,
 please do not send libpng questions to that address, send them to me
-or to the png-implement list.  I'll
+or to the png-mng-implement list.  I'll
 get them in the end anyway.  If you have a question about something
 in the PNG specification that is related to using libpng, send it
 to me.  Send me any questions that start with "I was using libpng,
@@ -190,11 +194,11 @@ Files in this distribution:
       descrip.mms      =>  VMS makefile for MMS or MMK
       makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
       makefile.elf     =>  Linux/ELF makefile symbol versioning,
-                            gcc, creates libpng12.so.0.1.2.23)
+                            gcc, creates libpng12.so.0.1.2.41beta02)
       makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.23)
+                            (gcc, creates libpng12.so.0.1.2.41beta02)
       makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.23,
+                            (gcc, creates libpng12.so.0.1.2.41beta02,
                            uses assembler code tuned for Intel MMX platform)
       makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
       makefile.knr     =>  Archaic UNIX Makefile that converts files with
@@ -216,12 +220,12 @@ Files in this distribution:
       makefile.openbsd =>  OpenBSD makefile
       makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
       makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng12.so.0.1.2.23)
+                            (gcc, creates libpng12.so.0.1.2.41beta02)
       makefile.sunos   =>  Sun makefile
       makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.23)
+                            (gcc, creates libpng12.so.0.1.2.41beta02)
       makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.23)
+                            (gcc, creates libpng12.so.0.1.2.41beta02)
       makefile.32sunu  =>  Sun Ultra 32-bit makefile
       makefile.64sunu  =>  Sun Ultra 64-bit makefile
       makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
@@ -256,7 +260,7 @@ Good luck, and happy coding.

 -Andreas Eric Dilger (former maintainer, 1996-1997)
 Internet: adilger at enel.ucalgary.ca
- Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/
+ Web: http://members.shaw.ca/adilger/

 -Guy Eric Schalnat (original author and former maintainer, 1995-1996)
 (formerly of Group 42, Inc)
--- a/1
+++ b/1
@@ -22,3 +22,4 @@ Build gamma tables using fixed point (and do away with floating point entirely).
 Use greater precision when changing to linear gamma for compositing against
  background and doing rgb-to-gray transformation.
 Investigate pre-incremented loop counters and other loop constructions.
+Add interpolated method of handling interlacing.
--- a/4
+++ b/4
@@ -1,13 +1,13 @@
   Y2K compliance in libpng:
   =========================

-      November 6, 2007
+      September 30, 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 1.2.23 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.41beta02 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
--- a/aclocal.m4
+++ b/aclocal.m4
--- a/autogen.sh
+++ b/autogen.sh
@@ -7,7 +7,7 @@
        touch Makefile.am configure.ac
 {
 	echo "running libtoolize" >&2
-	libtoolize --copy --automake
+	libtoolize --force --copy --automake
 } && {
 	echo "running aclocal" >&2
 	aclocal
@@ -16,7 +16,7 @@
 	autoheader
 } && {
 	echo "running automake" >&2
-	automake --foreign -a -c
+	automake --force-missing --foreign -a -c
 } && {
 	echo "running autoconf" >&2
 	autoconf
--- a/config.guess
+++ b/config.guess
@@ -1,9 +1,10 @@
 #! /bin/sh
 # Attempt to guess a canonical system name.
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+#   Free Software Foundation, Inc.

-timestamp='2005-12-23'
+timestamp='2009-04-27'

 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -55,8 +56,8 @@ version="\
 GNU config.guess ($timestamp)

 Originally written by Per Bothner.
-Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
-Free Software Foundation, Inc.
+Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
+2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -106,7 +107,7 @@ set_cc_for_build='
 trap "exitcode=\$?; (rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null) && exit \$exitcode" 0 ;
 trap "rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null; exit 1" 1 2 13 15 ;
 : ${TMPDIR=/tmp} ;
- { tmp=`(umask 077 && mktemp -d -q "$TMPDIR/cgXXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" ; } ||
+ { tmp=`(umask 077 && mktemp -d "$TMPDIR/cgXXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" ; } ||
 { test -n "$RANDOM" && tmp=$TMPDIR/cg$$-$RANDOM && (umask 077 && mkdir $tmp) ; } ||
 { tmp=$TMPDIR/cg-$$ && (umask 077 && mkdir $tmp) && echo "Warning: creating insecure temp directory" >&2 ; } ||
 { echo "$me: cannot create a temporary directory in $TMPDIR" >&2 ; exit 1 ; } ;
@@ -138,23 +139,6 @@ UNAME_RELEASE=`(uname -r) 2>/dev/null` || UNAME_RELEASE=unknown
 UNAME_SYSTEM=`(uname -s) 2>/dev/null`  || UNAME_SYSTEM=unknown
 UNAME_VERSION=`(uname -v) 2>/dev/null` || UNAME_VERSION=unknown

-if [ "${UNAME_SYSTEM}" = "Linux" ] ; then
-	eval $set_cc_for_build
-	cat << EOF > $dummy.c
-	#include <features.h>
-	#ifdef __UCLIBC__
-	# ifdef __UCLIBC_CONFIG_VERSION__
-	LIBC=uclibc __UCLIBC_CONFIG_VERSION__
-	# else
-	LIBC=uclibc
-	# endif
-	#else
-	LIBC=gnu
-	#endif
-EOF
-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep LIBC= | sed -e 's: ::g'`
-fi
-
 # Note: order is significant - the case branches are not exclusive.

 case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
@@ -177,6 +161,7 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	    arm*) machine=arm-unknown ;;
 	    sh3el) machine=shl-unknown ;;
 	    sh3eb) machine=sh-unknown ;;
+	    sh5el) machine=sh5le-unknown ;;
 	    *) machine=${UNAME_MACHINE_ARCH}-unknown ;;
 	esac
 	# The Operating System including object format, if it has switched
@@ -223,8 +208,11 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
    *:ekkoBSD:*:*)
 	echo ${UNAME_MACHINE}-unknown-ekkobsd${UNAME_RELEASE}
 	exit ;;
+    *:SolidBSD:*:*)
+	echo ${UNAME_MACHINE}-unknown-solidbsd${UNAME_RELEASE}
+	exit ;;
    macppc:MirBSD:*:*)
-	echo powerppc-unknown-mirbsd${UNAME_RELEASE}
+	echo powerpc-unknown-mirbsd${UNAME_RELEASE}
 	exit ;;
    *:MirBSD:*:*)
 	echo ${UNAME_MACHINE}-unknown-mirbsd${UNAME_RELEASE}
@@ -336,14 +324,30 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	case `/usr/bin/uname -p` in
 	    sparc) echo sparc-icl-nx7; exit ;;
 	esac ;;
+    s390x:SunOS:*:*)
+	echo ${UNAME_MACHINE}-ibm-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+	exit ;;
    sun4H:SunOS:5.*:*)
 	echo sparc-hal-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
 	exit ;;
    sun4*:SunOS:5.*:* | tadpole*:SunOS:5.*:*)
 	echo sparc-sun-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
 	exit ;;
-    i86pc:SunOS:5.*:*)
-	echo i386-pc-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+    i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
+	eval $set_cc_for_build
+	SUN_ARCH="i386"
+	# If there is a compiler, see if it is configured for 64-bit objects.
+	# Note that the Sun cc does not turn __LP64__ into 1 like gcc does.
+	# This test works for both compilers.
+	if [ "$CC_FOR_BUILD" != 'no_compiler_found' ]; then
+	    if (echo '#ifdef __amd64'; echo IS_64BIT_ARCH; echo '#endif') | \
+		(CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) | \
+		grep IS_64BIT_ARCH >/dev/null
+	    then
+		SUN_ARCH="x86_64"
+	    fi
+	fi
+	echo ${SUN_ARCH}-pc-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
 	exit ;;
    sun4*:SunOS:6*:*)
 	# According to config.sub, this is the proper way to canonicalize
@@ -544,7 +548,7 @@ EOF
 		echo rs6000-ibm-aix3.2
 	fi
 	exit ;;
-    *:AIX:*:[45])
+    *:AIX:*:[456])
 	IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'`
 	if /usr/sbin/lsattr -El ${IBM_CPU_ID} | grep ' POWER' >/dev/null 2>&1; then
 		IBM_ARCH=rs6000
@@ -784,6 +788,8 @@ EOF
 	case ${UNAME_MACHINE} in
 	    pc98)
 		echo i386-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
+	    amd64)
+		echo x86_64-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
 	    *)
 		echo ${UNAME_MACHINE}-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
 	esac
@@ -791,7 +797,7 @@ EOF
    i*:CYGWIN*:*)
 	echo ${UNAME_MACHINE}-pc-cygwin
 	exit ;;
-    i*:MINGW*:*)
+    *:MINGW*:*)
 	echo ${UNAME_MACHINE}-pc-mingw32
 	exit ;;
    i*:windows32*:*)
@@ -801,9 +807,18 @@ EOF
    i*:PW*:*)
 	echo ${UNAME_MACHINE}-pc-pw32
 	exit ;;
-    x86:Interix*:[345]*)
-	echo i586-pc-interix${UNAME_RELEASE}|sed -e 's/\..*//'
-	exit ;;
+    *:Interix*:[3456]*)
+    	case ${UNAME_MACHINE} in
+	    x86)
+		echo i586-pc-interix${UNAME_RELEASE}
+		exit ;;
+	    EM64T | authenticamd | genuineintel)
+		echo x86_64-unknown-interix${UNAME_RELEASE}
+		exit ;;
+	    IA64)
+		echo ia64-unknown-interix${UNAME_RELEASE}
+		exit ;;
+	esac ;;
    [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*)
 	echo i${UNAME_MACHINE}-pc-mks
 	exit ;;
@@ -837,25 +852,35 @@ EOF
 	echo ${UNAME_MACHINE}-pc-minix
 	exit ;;
    arm*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	eval $set_cc_for_build
+	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
+	    | grep -q __ARM_EABI__
+	then
+	    echo ${UNAME_MACHINE}-unknown-linux-gnu
+	else
+	    echo ${UNAME_MACHINE}-unknown-linux-gnueabi
+	fi
+	exit ;;
+    avr32*:Linux:*:*)
+	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    cris:Linux:*:*)
-	echo cris-axis-linux-${LIBC}
+	echo cris-axis-linux-gnu
 	exit ;;
    crisv32:Linux:*:*)
-	echo crisv32-axis-linux-${LIBC}
+	echo crisv32-axis-linux-gnu
 	exit ;;
    frv:Linux:*:*)
-    	echo frv-unknown-linux-${LIBC}
+    	echo frv-unknown-linux-gnu
 	exit ;;
    ia64:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    m32r*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    m68*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    mips:Linux:*:*)
 	eval $set_cc_for_build
@@ -873,8 +898,12 @@ EOF
 	#endif
 	#endif
 EOF
-	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '/^CPU/{s: ::g;p;}'`"
-	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-${LIBC}"; exit; }
+	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
+	    /^CPU/{
+		s: ::g
+		p
+	    }'`"
+	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
 	;;
    mips64:Linux:*:*)
 	eval $set_cc_for_build
@@ -892,17 +921,21 @@ EOF
 	#endif
 	#endif
 EOF
-	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '/^CPU/{s: ::g;p;}'`"
-	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-${LIBC}"; exit; }
+	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
+	    /^CPU/{
+		s: ::g
+		p
+	    }'`"
+	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
 	;;
    or32:Linux:*:*)
-	echo or32-unknown-linux-${LIBC}
+	echo or32-unknown-linux-gnu
 	exit ;;
    ppc:Linux:*:*)
-	echo powerpc-unknown-linux-${LIBC}
+	echo powerpc-unknown-linux-gnu
 	exit ;;
    ppc64:Linux:*:*)
-	echo powerpc64-unknown-linux-${LIBC}
+	echo powerpc64-unknown-linux-gnu
 	exit ;;
    alpha:Linux:*:*)
 	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
@@ -915,37 +948,43 @@ EOF
 	  EV68*) UNAME_MACHINE=alphaev68 ;;
        esac
 	objdump --private-headers /bin/sh | grep ld.so.1 >/dev/null
-	if test "$?" = 0 ; then LIBC="gnulibc1" ; fi
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
+	echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
+	exit ;;
+    padre:Linux:*:*)
+	echo sparc-unknown-linux-gnu
 	exit ;;
    parisc:Linux:*:* | hppa:Linux:*:*)
 	# Look for CPU level
 	case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
-	  PA7*) echo hppa1.1-unknown-linux-${LIBC} ;;
-	  PA8*) echo hppa2.0-unknown-linux-${LIBC} ;;
-	  *)    echo hppa-unknown-linux-${LIBC} ;;
+	  PA7*) echo hppa1.1-unknown-linux-gnu ;;
+	  PA8*) echo hppa2.0-unknown-linux-gnu ;;
+	  *)    echo hppa-unknown-linux-gnu ;;
 	esac
 	exit ;;
    parisc64:Linux:*:* | hppa64:Linux:*:*)
-	echo hppa64-unknown-linux-${LIBC}
+	echo hppa64-unknown-linux-gnu
 	exit ;;
    s390:Linux:*:* | s390x:Linux:*:*)
 	echo ${UNAME_MACHINE}-ibm-linux
 	exit ;;
    sh64*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+    	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    sh*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    sparc:Linux:*:* | sparc64:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    vax:Linux:*:*)
-	echo ${UNAME_MACHINE}-dec-linux-${LIBC}
+	echo ${UNAME_MACHINE}-dec-linux-gnu
 	exit ;;
    x86_64:Linux:*:*)
-	echo x86_64-unknown-linux-${LIBC}
+	echo x86_64-unknown-linux-gnu
+	exit ;;
+    xtensa*:Linux:*:*)
+    	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
    i*86:Linux:*:*)
 	# The BFD linker knows what the default object file format is, so
@@ -960,22 +999,17 @@ EOF
 				    p'`
        case "$ld_supported_targets" in
 	  elf32-i386)
-		TENTATIVE="${UNAME_MACHINE}-pc-linux-${LIBC}"
+		TENTATIVE="${UNAME_MACHINE}-pc-linux-gnu"
 		;;
 	  a.out-i386-linux)
-		echo "${UNAME_MACHINE}-pc-linux-${LIBC}aout"
-		exit ;;
-	  coff-i386)
-		echo "${UNAME_MACHINE}-pc-linux-${LIBC}coff"
+		echo "${UNAME_MACHINE}-pc-linux-gnuaout"
 		exit ;;
 	  "")
 		# Either a pre-BFD a.out linker (linux-gnuoldld) or
 		# one that does not give us useful --help.
-		echo "${UNAME_MACHINE}-pc-linux-${LIBC}oldld"
+		echo "${UNAME_MACHINE}-pc-linux-gnuoldld"
 		exit ;;
 	esac
-	# This should get integrated into the C code below, but now we hack
-	if [ "$LIBC" != "gnu" ] ; then echo "$TENTATIVE" && exit 0 ; fi
 	# Determine whether the default compiler is a.out or elf
 	eval $set_cc_for_build
 	sed 's/^	//' << EOF >$dummy.c
@@ -991,7 +1025,7 @@ EOF
 	LIBC=gnulibc1
 	# endif
 	#else
-	#if defined(__INTEL_COMPILER) || defined(__PGI)
+	#if defined(__INTEL_COMPILER) || defined(__PGI) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
 	LIBC=gnu
 	#else
 	LIBC=gnuaout
@@ -1001,7 +1035,11 @@ EOF
 	LIBC=dietlibc
 	#endif
 EOF
-	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '/^LIBC/{s: ::g;p;}'`"
+	eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
+	    /^LIBC/{
+		s: ::g
+		p
+	    }'`"
 	test x"${LIBC}" != x && {
 		echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
 		exit
@@ -1080,8 +1118,11 @@ EOF
    pc:*:*:*)
 	# Left here for compatibility:
        # uname -m prints for DJGPP always 'pc', but it prints nothing about
-        # the processor, so we play safe by assuming i386.
-	echo i386-pc-msdosdjgpp
+        # the processor, so we play safe by assuming i586.
+	# Note: whatever this is, it MUST be the same as what config.sub
+	# prints for the "djgpp" host, or else GDB configury will decide that
+	# this is a cross-build.
+	echo i586-pc-msdosdjgpp
        exit ;;
    Intel:Mach:3*:*)
 	echo i386-pc-mach3
@@ -1119,6 +1160,16 @@ EOF
    3[34]??:*:4.0:* | 3[34]??,*:*:4.0:*)
        /bin/uname -p 2>/dev/null | grep 86 >/dev/null \
          && { echo i486-ncr-sysv4; exit; } ;;
+    NCR*:*:4.2:* | MPRAS*:*:4.2:*)
+	OS_REL='.3'
+	test -r /etc/.relid \
+	    && OS_REL=.`sed -n 's/[^ ]* [^ ]* \([0-9][0-9]\).*/\1/p' < /etc/.relid`
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	    && { echo i486-ncr-sysv4.3${OS_REL}; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
+	    && { echo i586-ncr-sysv4.3${OS_REL}; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep pteron >/dev/null \
+	    && { echo i586-ncr-sysv4.3${OS_REL}; exit; } ;;
    m68*:LynxOS:2.*:* | m68*:LynxOS:3.0*:*)
 	echo m68k-unknown-lynxos${UNAME_RELEASE}
 	exit ;;
@@ -1194,6 +1245,9 @@ EOF
    BePC:BeOS:*:*)	# BeOS running on Intel PC compatible.
 	echo i586-pc-beos
 	exit ;;
+    BePC:Haiku:*:*)	# Haiku running on Intel PC compatible.
+	echo i586-pc-haiku
+	exit ;;
    SX-4:SUPER-UX:*:*)
 	echo sx4-nec-superux${UNAME_RELEASE}
 	exit ;;
@@ -1203,6 +1257,15 @@ EOF
    SX-6:SUPER-UX:*:*)
 	echo sx6-nec-superux${UNAME_RELEASE}
 	exit ;;
+    SX-7:SUPER-UX:*:*)
+	echo sx7-nec-superux${UNAME_RELEASE}
+	exit ;;
+    SX-8:SUPER-UX:*:*)
+	echo sx8-nec-superux${UNAME_RELEASE}
+	exit ;;
+    SX-8R:SUPER-UX:*:*)
+	echo sx8r-nec-superux${UNAME_RELEASE}
+	exit ;;
    Power*:Rhapsody:*:*)
 	echo powerpc-apple-rhapsody${UNAME_RELEASE}
 	exit ;;
@@ -1293,6 +1356,9 @@ EOF
    i*86:rdos:*:*)
 	echo ${UNAME_MACHINE}-pc-rdos
 	exit ;;
+    i*86:AROS:*:*)
+	echo ${UNAME_MACHINE}-pc-aros
+	exit ;;
 esac

 #echo '(No uname command or uname output not recognized.)' 1>&2
@@ -1453,9 +1519,9 @@ This script, last modified $timestamp, has failed to recognize
 the operating system you are using. It is advised that you
 download the most up to date version of the config scripts from

-  http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/config/config/config.guess
+  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD
 and
-  http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/config/config/config.sub
+  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD

 If the version you run ($0) is already up to date, please
 send the following data and any information you think might be
--- a/config.h.in
+++ b/config.h.in
@@ -45,6 +45,10 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H

+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
 /* Name of package */
 #undef PACKAGE

@@ -60,6 +64,9 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME

+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION

--- a/config.sub
+++ b/config.sub
@@ -1,9 +1,10 @@
 #! /bin/sh
 # Configuration validation subroutine script.
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+#   Free Software Foundation, Inc.

-timestamp='2005-12-23'
+timestamp='2009-04-17'

 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -71,8 +72,8 @@ Report bugs and patches to <config-patches@gnu.org>."
 version="\
 GNU config.sub ($timestamp)

-Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
-Free Software Foundation, Inc.
+Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
+2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -121,6 +122,7 @@ maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
 case $maybe_os in
  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-uclibc* | \
  uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
+  kopensolaris*-gnu* | \
  storm-chaos* | os2-emx* | rtmk-nova*)
    os=-$maybe_os
    basic_machine=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`
@@ -240,20 +242,24 @@ case $basic_machine in
 	| alpha | alphaev[4-8] | alphaev56 | alphaev6[78] | alphapca5[67] \
 	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \
 	| am33_2.0 \
-	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr \
+	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr | avr32 \
 	| bfin \
 	| c4x | clipper \
-	| d10v | d30v | dlx | dsp16xx | dvp \
-	| fr30 | frv \
+	| d10v | d30v | dlx | dsp16xx \
+	| fido | fr30 | frv \
 	| h8300 | h8500 | hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
 	| i370 | i860 | i960 | ia64 \
 	| ip2k | iq2000 \
-	| m32r | m32rle | m68000 | m68k | m88k | maxq | mb | microblaze | mcore \
+	| lm32 \
+	| m32c | m32r | m32rle | m68000 | m68k | m88k \
+	| maxq | mb | microblaze | mcore | mep | metag \
 	| mips | mipsbe | mipseb | mipsel | mipsle \
 	| mips16 \
 	| mips64 | mips64el \
-	| mips64vr | mips64vrel \
+	| mips64octeon | mips64octeonel \
 	| mips64orion | mips64orionel \
+	| mips64r5900 | mips64r5900el \
+	| mips64vr | mips64vrel \
 	| mips64vr4100 | mips64vr4100el \
 	| mips64vr4300 | mips64vr4300el \
 	| mips64vr5000 | mips64vr5000el \
@@ -266,26 +272,26 @@ case $basic_machine in
 	| mipsisa64sr71k | mipsisa64sr71kel \
 	| mipstx39 | mipstx39el \
 	| mn10200 | mn10300 \
+	| moxie \
 	| mt \
 	| msp430 \
+	| nios | nios2 \
 	| ns16k | ns32k \
 	| or32 \
 	| pdp10 | pdp11 | pj | pjl \
 	| powerpc | powerpc64 | powerpc64le | powerpcle | ppcbe \
 	| pyramid \
-	| sh | sh[1234] | sh[24]a | sh[24]a*eb | sh[23]e | sh[34]eb | shbe | shle | sh[1234]le | sh3ele \
+	| score \
+	| sh | sh[1234] | sh[24]a | sh[24]aeb | sh[23]e | sh[34]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
 	| sh64 | sh64le \
-	| sparc | sparc64 | sparc64b | sparc86x | sparclet | sparclite \
-	| sparcv8 | sparcv9 | sparcv9b \
-	| strongarm \
+	| sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet | sparclite \
+	| sparcv8 | sparcv9 | sparcv9b | sparcv9v \
+	| spu | strongarm \
 	| tahoe | thumb | tic4x | tic80 | tron \
 	| v850 | v850e \
 	| we32k \
-	| x86 | xscale | xscalee[bl] | xstormy16 | xtensa \
-	| z8k)
-		basic_machine=$basic_machine-unknown
-		;;
-	m32c)
+	| x86 | xc16x | xscale | xscalee[bl] | xstormy16 | xtensa \
+	| z8k | z80)
 		basic_machine=$basic_machine-unknown
 		;;
 	m6811 | m68hc11 | m6812 | m68hc12)
@@ -298,10 +304,6 @@ case $basic_machine in
 	ms1)
 		basic_machine=mt-unknown
 		;;
-	nios2 | nios2-* | nios2 | nios2-*)
-		basic_machine=nios2-altera
-		os=-none
-		;;

 	# We use `pc' rather than `unknown'
 	# because (1) that's what they normally are, and
@@ -321,25 +323,28 @@ case $basic_machine in
 	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \
 	| alphapca5[67]-* | alpha64pca5[67]-* | arc-* \
 	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* \
-	| avr-* \
+	| avr-* | avr32-* \
 	| bfin-* | bs2000-* \
 	| c[123]* | c30-* | [cjt]90-* | c4x-* | c54x-* | c55x-* | c6x-* \
 	| clipper-* | craynv-* | cydra-* \
 	| d10v-* | d30v-* | dlx-* \
 	| elxsi-* \
-	| f30[01]-* | f700-* | fr30-* | frv-* | fx80-* \
+	| f30[01]-* | f700-* | fido-* | fr30-* | frv-* | fx80-* \
 	| h8300-* | h8500-* \
 	| hppa-* | hppa1.[01]-* | hppa2.0-* | hppa2.0[nw]-* | hppa64-* \
 	| i*86-* | i860-* | i960-* | ia64-* \
 	| ip2k-* | iq2000-* \
-	| m32r-* | m32rle-* \
+	| lm32-* \
+	| m32c-* | m32r-* | m32rle-* \
 	| m68000-* | m680[012346]0-* | m68360-* | m683?2-* | m68k-* \
-	| m88110-* | m88k-* | maxq-* | mcore-* \
+	| m88110-* | m88k-* | maxq-* | mcore-* | metag-* \
 	| mips-* | mipsbe-* | mipseb-* | mipsel-* | mipsle-* \
 	| mips16-* \
 	| mips64-* | mips64el-* \
-	| mips64vr-* | mips64vrel-* \
+	| mips64octeon-* | mips64octeonel-* \
 	| mips64orion-* | mips64orionel-* \
+	| mips64r5900-* | mips64r5900el-* \
+	| mips64vr-* | mips64vrel-* \
 	| mips64vr4100-* | mips64vr4100el-* \
 	| mips64vr4300-* | mips64vr4300el-* \
 	| mips64vr5000-* | mips64vr5000el-* \
@@ -354,28 +359,31 @@ case $basic_machine in
 	| mmix-* \
 	| mt-* \
 	| msp430-* \
+	| nios-* | nios2-* \
 	| none-* | np1-* | ns16k-* | ns32k-* \
 	| orion-* \
 	| pdp10-* | pdp11-* | pj-* | pjl-* | pn-* | power-* \
 	| powerpc-* | powerpc64-* | powerpc64le-* | powerpcle-* | ppcbe-* \
 	| pyramid-* \
 	| romp-* | rs6000-* \
-	| sh-* | sh[1234]-* | sh[24]a-* | sh[23]e-* | sh[34]eb-* | shbe-* \
+	| sh-* | sh[1234]-* | sh[24]a-* | sh[24]aeb-* | sh[23]e-* | sh[34]eb-* | sheb-* | shbe-* \
 	| shle-* | sh[1234]le-* | sh3ele-* | sh64-* | sh64le-* \
-	| sparc-* | sparc64-* | sparc64b-* | sparc86x-* | sparclet-* \
+	| sparc-* | sparc64-* | sparc64b-* | sparc64v-* | sparc86x-* | sparclet-* \
 	| sparclite-* \
-	| sparcv8-* | sparcv9-* | sparcv9b-* | strongarm-* | sv1-* | sx?-* \
+	| sparcv8-* | sparcv9-* | sparcv9b-* | sparcv9v-* | strongarm-* | sv1-* | sx?-* \
 	| tahoe-* | thumb-* \
-	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* \
+	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* | tile-* \
 	| tron-* \
 	| v850-* | v850e-* | vax-* \
 	| we32k-* \
-	| x86-* | x86_64-* | xps100-* | xscale-* | xscalee[bl]-* \
-	| xstormy16-* | xtensa-* \
+	| x86-* | x86_64-* | xc16x-* | xps100-* | xscale-* | xscalee[bl]-* \
+	| xstormy16-* | xtensa*-* \
 	| ymp-* \
-	| z8k-*)
+	| z8k-* | z80-*)
 		;;
-	m32c-*)
+	# Recognize the basic CPU types without company name, with glob match.
+	xtensa*)
+		basic_machine=$basic_machine-unknown
 		;;
 	# Recognize the various machine names and aliases which stand
 	# for a CPU type and a company and sometimes even an OS.
@@ -439,6 +447,10 @@ case $basic_machine in
 		basic_machine=m68k-apollo
 		os=-bsd
 		;;
+	aros)
+		basic_machine=i386-pc
+		os=-aros
+		;;
 	aux)
 		basic_machine=m68k-apple
 		os=-aux
@@ -447,10 +459,22 @@ case $basic_machine in
 		basic_machine=ns32k-sequent
 		os=-dynix
 		;;
+	blackfin)
+		basic_machine=bfin-unknown
+		os=-linux
+		;;
+	blackfin-*)
+		basic_machine=bfin-`echo $basic_machine | sed 's/^[^-]*-//'`
+		os=-linux
+		;;
 	c90)
 		basic_machine=c90-cray
 		os=-unicos
 		;;
+        cegcc)
+		basic_machine=arm-unknown
+		os=-cegcc
+		;;
 	convex-c1)
 		basic_machine=c1-convex
 		os=-bsd
@@ -479,8 +503,8 @@ case $basic_machine in
 		basic_machine=craynv-cray
 		os=-unicosmp
 		;;
-	cr16c)
-		basic_machine=cr16c-unknown
+	cr16)
+		basic_machine=cr16-unknown
 		os=-elf
 		;;
 	crds | unos)
@@ -518,6 +542,10 @@ case $basic_machine in
 		basic_machine=m88k-motorola
 		os=-sysv3
 		;;
+	dicos)
+		basic_machine=i686-pc
+		os=-dicos
+		;;
 	djgpp)
 		basic_machine=i586-pc
 		os=-msdosdjgpp
@@ -672,6 +700,14 @@ case $basic_machine in
 		basic_machine=m68k-isi
 		os=-sysv
 		;;
+	m68knommu)
+		basic_machine=m68k-unknown
+		os=-linux
+		;;
+	m68knommu-*)
+		basic_machine=m68k-`echo $basic_machine | sed 's/^[^-]*-//'`
+		os=-linux
+		;;
 	m88k-omron*)
 		basic_machine=m88k-omron
 		;;
@@ -687,6 +723,10 @@ case $basic_machine in
 		basic_machine=i386-pc
 		os=-mingw32
 		;;
+	mingw32ce)
+		basic_machine=arm-unknown
+		os=-mingw32ce
+		;;
 	miniframe)
 		basic_machine=m68000-convergent
 		;;
@@ -694,24 +734,6 @@ case $basic_machine in
 		basic_machine=m68k-atari
 		os=-mint
 		;;
-	mipsEE* | ee | ps2)
-		basic_machine=mips64r5900el-scei
-		case $os in
-		    -linux*)
-			;;
-		    *)
-			os=-elf
-			;;
-		esac
-		;;
-	iop)
-		basic_machine=mipsel-scei
-		os=-irx
-		;;
-	dvp)
-		basic_machine=dvp-scei
-		os=-elf
-		;;
 	mips3*-*)
 		basic_machine=`echo $basic_machine | sed -e 's/mips3/mips64/'`
 		;;
@@ -831,6 +853,14 @@ case $basic_machine in
 		basic_machine=i860-intel
 		os=-osf
 		;;
+	parisc)
+		basic_machine=hppa-unknown
+		os=-linux
+		;;
+	parisc-*)
+		basic_machine=hppa-`echo $basic_machine | sed 's/^[^-]*-//'`
+		os=-linux
+		;;
 	pbd)
 		basic_machine=sparc-tti
 		;;
@@ -932,6 +962,10 @@ case $basic_machine in
 	sb1el)
 		basic_machine=mipsisa64sb1el-unknown
 		;;
+	sde)
+		basic_machine=mipsisa32-sde
+		os=-elf
+		;;
 	sei)
 		basic_machine=mips-sei
 		os=-seiux
@@ -943,6 +977,9 @@ case $basic_machine in
 		basic_machine=sh-hitachi
 		os=-hms
 		;;
+	sh5el)
+		basic_machine=sh5le-unknown
+		;;
 	sh64)
 		basic_machine=sh64-unknown
 		;;
@@ -1032,6 +1069,10 @@ case $basic_machine in
 		basic_machine=tic6x-unknown
 		os=-coff
 		;;
+	tile*)
+		basic_machine=tile-unknown
+		os=-linux-gnu
+		;;
 	tx39)
 		basic_machine=mipstx39-unknown
 		;;
@@ -1107,6 +1148,10 @@ case $basic_machine in
 		basic_machine=z8k-unknown
 		os=-sim
 		;;
+	z80-*-coff)
+		basic_machine=z80-unknown
+		os=-sim
+		;;
 	none)
 		basic_machine=none-none
 		os=-none
@@ -1145,10 +1190,10 @@ case $basic_machine in
 	we32k)
 		basic_machine=we32k-att
 		;;
-	sh[1234] | sh[24]a | sh[34]eb | sh[1234]le | sh[23]ele)
+	sh[1234] | sh[24]a | sh[24]aeb | sh[34]eb | sh[1234]le | sh[23]ele)
 		basic_machine=sh-unknown
 		;;
-	sparc | sparcv8 | sparcv9 | sparcv9b)
+	sparc | sparcv8 | sparcv9 | sparcv9b | sparcv9v)
 		basic_machine=sparc-sun
 		;;
 	cydra)
@@ -1217,16 +1262,18 @@ case $os in
 	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -sunos | -sunos[34]*\
 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
+	      | -kopensolaris* \
 	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
-	      | -aos* \
+	      | -aos* | -aros* \
 	      | -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \
 	      | -clix* | -riscos* | -uniplus* | -iris* | -rtu* | -xenix* \
-	      | -hiux* | -386bsd* | -knetbsd* | -mirbsd* | -netbsd* | -openbsd* \
+	      | -hiux* | -386bsd* | -knetbsd* | -mirbsd* | -netbsd* \
+	      | -openbsd* | -solidbsd* \
 	      | -ekkobsd* | -kfreebsd* | -freebsd* | -riscix* | -lynxos* \
 	      | -bosx* | -nextstep* | -cxux* | -aout* | -elf* | -oabi* \
 	      | -ptx* | -coff* | -ecoff* | -winnt* | -domain* | -vsta* \
 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
-	      | -chorusos* | -chorusrdb* \
+	      | -chorusos* | -chorusrdb* | -cegcc* \
 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
 	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-uclibc* \
 	      | -uxpv* | -beos* | -mpeix* | -udk* \
@@ -1236,7 +1283,7 @@ case $os in
 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
-	      | -skyos* | -haiku* | -rdos* | -irx*)
+	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops*)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	-qnx*)
@@ -1366,6 +1413,9 @@ case $os in
 	-zvmoe)
 		os=-zvmoe
 		;;
+	-dicos*)
+		os=-dicos
+		;;
 	-none)
 		;;
 	*)
@@ -1388,6 +1438,12 @@ else
 # system, and we'll never get to this point.

 case $basic_machine in
+        score-*)
+		os=-elf
+		;;
+        spu-*)
+		os=-elf
+		;;
 	*-acorn)
 		os=-riscix1.2
 		;;
@@ -1397,9 +1453,9 @@ case $basic_machine in
 	arm*-semi)
 		os=-aout
 		;;
-    c4x-* | tic4x-*)
-        os=-coff
-        ;;
+        c4x-* | tic4x-*)
+        	os=-coff
+		;;
 	# This must come before the *-dec entry.
 	pdp10-*)
 		os=-tops20
@@ -1425,6 +1481,9 @@ case $basic_machine in
 	m68*-cisco)
 		os=-aout
 		;;
+        mep-*)
+		os=-elf
+		;;
 	mips*-cisco)
 		os=-elf
 		;;
--- a/22873
+++ b/22873
--- a/configure.ac
+++ b/configure.ac
@@ -18,15 +18,15 @@ AC_PREREQ(2.59)

 dnl Version number stuff here:

-AC_INIT([libpng], [1.2.23], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.41beta02], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE

-PNGLIB_VERSION=1.2.23
+PNGLIB_VERSION=1.2.41beta02
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
-PNGLIB_RELEASE=23
+PNGLIB_RELEASE=41

 dnl End of version number stuff

@@ -38,6 +38,7 @@ AC_PROG_CC
 AC_PROG_LD
 AC_PROG_CPP
 AC_CHECK_TOOL(SED, sed, :)
+AC_LIBTOOL_WIN32_DLL
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
@@ -84,6 +85,16 @@ else
 fi
 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

+if test "$have_ld_version_script" = "yes"; then
+    AC_MSG_CHECKING([for symbol prefix])
+    SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
+                   | ${CPP-${CC-gcc} -E} - 2>&1 \
+                   | ${EGREP-grep} "^PREFIX=" \
+                   | ${SED-sed} "s:^PREFIX=::"`
+    AC_SUBST(SYMBOL_PREFIX)
+    AC_MSG_RESULT($SYMBOL_PREFIX)
+fi
+
 # Substitutions for .in files
 AC_SUBST(PNGLIB_VERSION)
 AC_SUBST(PNGLIB_MAJOR)
--- a/contrib/gregbook/LICENSE
+++ b/contrib/gregbook/LICENSE
@@ -1,6 +1,6 @@
  ---------------------------------------------------------------------------

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
--- a/contrib/gregbook/README
+++ b/contrib/gregbook/README
@@ -56,7 +56,7 @@ mation and links to the latest version of the source code, and Chapters

 Greg Roelofs
 http://pobox.com/~newt/greg_contact.html
-2 June 2007
+16 March 2008


 BUILD INSTRUCTIONS
--- a/contrib/gregbook/readpng2.h
+++ b/contrib/gregbook/readpng2.h
@@ -4,7 +4,7 @@

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -69,6 +69,12 @@
 #  define Trace(x)  ;
 #endif

+enum rpng2_states {
+    kPreInit = 0,
+    kWindowInit,
+    kDone
+};
+
 typedef unsigned char   uch;
 typedef unsigned short  ush;
 typedef unsigned long   ulg;
@@ -95,7 +101,7 @@ typedef struct _mainprog_info {
    int nommxcombine;
    int nommxinterlace;
 #endif
-    int done;
+    int state;
    uch bg_red;
    uch bg_green;
    uch bg_blue;
--- a/contrib/gregbook/rpng-win.c
+++ b/contrib/gregbook/rpng-win.c
@@ -23,10 +23,11 @@
              command-line parsing bug
    - 1.10:  enabled "message window"/console (thanks to David Geldreich)
    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed improper display of usage screen on PNG error(s)

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -77,7 +78,7 @@

 #define PROGNAME  "rpng-win"
 #define LONGNAME  "Simple PNG Viewer for Windows"
-#define VERSION   "2.00 of 2 June 2007"
+#define VERSION   "2.01 of 16 March 2008"

 #include <stdio.h>
 #include <stdlib.h>
@@ -271,40 +272,11 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
        }
    }

-    if (!filename) {
+    if (!filename)
        ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
-        ++error;
-    } else {
-        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
-            switch (rc) {
-                case 1:
-                    fprintf(stderr, PROGNAME
-                      ":  [%s] is not a PNG file: incorrect signature\n",
-                      filename);
-                    break;
-                case 2:
-                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
-                    break;
-                case 4:
-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
-                    break;
-                default:
-                    fprintf(stderr, PROGNAME
-                      ":  unknown readpng_init() error\n");
-                    break;
-            }
-            ++error;
-        }
-        if (error)
-            fclose(infile);
-    }


-    /* usage screen */
+    /* print usage screen if any errors up to this point */

    if (error) {
        int ch;
@@ -327,6 +299,47 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
+            switch (rc) {
+                case 1:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] is not a PNG file: incorrect signature\n",
+                      filename);
+                    break;
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng_init() error\n");
+                    break;
+            }
+            ++error;
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+        int ch;
+
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
        fprintf(stderr,
--- a/contrib/gregbook/rpng-x.c
+++ b/contrib/gregbook/rpng-x.c
@@ -25,10 +25,11 @@
    - 1.13:  fixed XFreeGC() crash bug (thanks to Patrick Welche)
    - 1.14:  added support for X resources (thanks to Gerhard Niklasch)
    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed improper display of usage screen on PNG error(s)

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -79,7 +80,7 @@

 #define PROGNAME  "rpng-x"
 #define LONGNAME  "Simple PNG Viewer for X"
-#define VERSION   "2.00 of 2 June 2007"
+#define VERSION   "2.01 of 16 March 2008"
 #define RESNAME   "rpng"	/* our X resource application name */
 #define RESCLASS  "Rpng"	/* our X resource class name */

@@ -265,9 +266,33 @@ int main(int argc, char **argv)
        }
    }

-    if (!filename) {
+    if (!filename)
        ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
+
+
+    /* print usage screen if any errors up to this point */
+
+    if (error) {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        readpng_version_info();
+        fprintf(stderr, "\n"
+          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
+          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
+          "\n", PROGNAME, default_display_exponent);
+        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
        ++error;
    } else {
@@ -280,8 +305,7 @@ int main(int argc, char **argv)
                    break;
                case 2:
                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
                    break;
                case 4:
                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
@@ -306,25 +330,9 @@ int main(int argc, char **argv)
    }


-    /* usage screen */
-
    if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
-        readpng_version_info();
-        fprintf(stderr, "\n"
-          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
-          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
-          "\t\t  to the product of the lookup-table exponent (varies)\n"
-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
-          "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
-          "\t\t  used with transparent images\n"
-          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
-          "is displayed) to quit.\n"
-          "\n", PROGNAME, default_display_exponent);
-        exit(1);
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        exit(2);
    }


--- a/contrib/gregbook/rpng2-win.c
+++ b/contrib/gregbook/rpng2-win.c
@@ -10,7 +10,7 @@
   tweaking (or maybe not).  Thanks to Adam Costello and Pieter S. van der
   Meulen for the "diamond" and "radial waves" patterns, respectively.

-   to do:
+   to do (someday, maybe):
    - handle quoted command-line args (especially filenames with spaces)
    - finish resizable checkerboard-gradient (sizes 4-128?)
    - use %.1023s to simplify truncation of title-bar string?
@@ -29,10 +29,13 @@
    - 1.21:  made minor tweak to usage screen to fit within 25-line console
    - 1.22:  added AMD64/EM64T support (__x86_64__)
    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed 64-bit typo in readpng2.c
+    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
+              unexpected-EOF and file-read-error cases

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -83,7 +86,7 @@

 #define PROGNAME  "rpng2-win"
 #define LONGNAME  "Progressive PNG Viewer for Windows"
-#define VERSION   "2.00 of 2 June 2007"
+#define VERSION   "2.02 of 16 March 2008"

 #include <stdio.h>
 #include <stdlib.h>
@@ -414,41 +417,11 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
        }
    }

-    if (!filename) {
+    if (!filename)
        ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
-        ++error;
-    } else {
-        incount = fread(inbuf, 1, INBUFSIZE, infile);
-        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
-            fprintf(stderr, PROGNAME
-              ":  [%s] is not a PNG file: incorrect signature\n",
-              filename);
-            ++error;
-        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
-            switch (rc) {
-                case 2:
-                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
-                    break;
-                case 4:
-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
-                    break;
-                default:
-                    fprintf(stderr, PROGNAME
-                      ":  unknown readpng2_init() error\n");
-                    break;
-            }
-            ++error;
-        }
-        if (error)
-            fclose(infile);
-    }


-    /* usage screen */
+    /* print usage screen if any errors up to this point */

    if (error) {
        int ch;
@@ -488,6 +461,48 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        incount = fread(inbuf, 1, INBUFSIZE, infile);
+        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
+            fprintf(stderr, PROGNAME
+              ":  [%s] is not a PNG file: incorrect signature\n",
+              filename);
+            ++error;
+        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
+            switch (rc) {
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng2_init() error\n");
+                    break;
+            }
+            ++error;
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+        int ch;
+
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
        fprintf(stderr,
@@ -519,7 +534,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    } else
        rpng2_info.need_bgcolor = TRUE;

-    rpng2_info.done = FALSE;
+    rpng2_info.state = kPreInit;
    rpng2_info.mainprog_init = rpng2_win_init;
    rpng2_info.mainprog_display_row = rpng2_win_display_row;
    rpng2_info.mainprog_finish_display = rpng2_win_finish_display;
@@ -539,10 +554,27 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
        if (readpng2_decode_data(&rpng2_info, inbuf, incount))
            ++error;
        Trace((stderr, "done with readpng2_decode_data()\n"))
-        if (error || feof(infile) || rpng2_info.done)
+
+        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {
+            if (rpng2_info.state == kDone) {
+                Trace((stderr, "done decoding PNG image\n"))
+            } else if (ferror(infile)) {
+                fprintf(stderr, PROGNAME
+                  ":  error while reading PNG image file\n");
+                exit(3);
+            } else if (feof(infile)) {
+                fprintf(stderr, PROGNAME ":  end of file reached "
+                  "(unexpectedly) while reading PNG image file\n");
+                exit(3);
+            } else /* if (error) */ {
+                // will print error message below
+            }
            break;
+        }
+
        if (timing)
            Sleep(1000L);
+
        incount = fread(inbuf, 1, INBUFSIZE, infile);
    }

@@ -589,7 +621,7 @@ static void rpng2_win_init()
    ulg rowbytes = rpng2_info.rowbytes;

    Trace((stderr, "beginning rpng2_win_init()\n"))
-    Trace((stderr, "  rowbytes = %ld\n", rpng2_info.rowbytes))
+    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))
    Trace((stderr, "  width  = %ld\n", rpng2_info.width))
    Trace((stderr, "  height = %ld\n", rpng2_info.height))

@@ -619,6 +651,8 @@ static void rpng2_win_init()
        readpng2_cleanup(&rpng2_info);
        return;
    }
+
+    rpng2_info.state = kWindowInit;
 }


@@ -1114,7 +1148,7 @@ static void rpng2_win_finish_display()
     * we have nothing to do here except set a flag and let the user know
     * that the image is done */

-    rpng2_info.done = TRUE;
+    rpng2_info.state = kDone;
    printf(
      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
    fflush(stdout);
--- a/contrib/gregbook/rpng2-x.c
+++ b/contrib/gregbook/rpng2-x.c
@@ -12,7 +12,7 @@
   Thanks to Adam Costello and Pieter S. van der Meulen for the "diamond"
   and "radial waves" patterns, respectively.

-   to do:
+   to do (someday, maybe):
    - fix expose/redraw code:  don't draw entire row if only part exposed
    - 8-bit (colormapped) X support
    - finish resizable checkerboard-gradient (sizes 4-128?)
@@ -36,10 +36,14 @@
    - 1.32:  added AMD64/EM64T support (__x86_64__); added basic expose/redraw
              handling
    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed 64-bit typo in readpng2.c; fixed -pause usage description
+    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
+              unexpected-EOF and file-read-error cases; fixed Trace() cut-and-
+              paste bugs

  ---------------------------------------------------------------------------

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
@@ -90,7 +94,7 @@

 #define PROGNAME  "rpng2-x"
 #define LONGNAME  "Progressive PNG Viewer for X"
-#define VERSION   "2.00 of 2 June 2007"
+#define VERSION   "2.02 of 16 March 2008"
 #define RESNAME   "rpng2"	/* our X resource application name */
 #define RESCLASS  "Rpng"	/* our X resource class name */

@@ -453,49 +457,11 @@ int main(int argc, char **argv)
        }
    }

-    if (!filename) {
+    if (!filename)
        ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
-        ++error;
-    } else {
-        incount = fread(inbuf, 1, INBUFSIZE, infile);
-        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
-            fprintf(stderr, PROGNAME
-              ":  [%s] is not a PNG file: incorrect signature\n",
-              filename);
-            ++error;
-        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
-            switch (rc) {
-                case 2:
-                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
-                    break;
-                case 4:
-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
-                    break;
-                default:
-                    fprintf(stderr, PROGNAME
-                      ":  unknown readpng2_init() error\n");
-                    break;
-            }
-            ++error;
-        } else {
-            display = XOpenDisplay(displayname);
-            if (!display) {
-                readpng2_cleanup(&rpng2_info);
-                fprintf(stderr, PROGNAME ":  can't open X display [%s]\n",
-                  displayname? displayname : "default");
-                ++error;
-            }
-        }
-        if (error)
-            fclose(infile);
-    }


-    /* usage screen */
+    /* print usage screen if any errors up to this point */

    if (error) {
        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
@@ -533,7 +499,7 @@ int main(int argc, char **argv)
          "\t\t  row (for demo purposes)\n"
          "    -timing\tenables delay for every block read, to simulate modem\n"
          "\t\t  download of image (~36 Kbps)\n"
-          "    -pause\tpauses after displaying each pass until key pressed\n"
+          "    -pause\tpauses after displaying each pass until mouse clicked\n"
          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
          "is displayed) to quit.\n"
          "\n", PROGNAME,
@@ -545,6 +511,52 @@ int main(int argc, char **argv)
    }


+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        incount = fread(inbuf, 1, INBUFSIZE, infile);
+        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
+            fprintf(stderr, PROGNAME
+              ":  [%s] is not a PNG file: incorrect signature\n",
+              filename);
+            ++error;
+        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
+            switch (rc) {
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng2_init() error\n");
+                    break;
+            }
+            ++error;
+        } else {
+            Trace((stderr, "about to call XOpenDisplay()\n"))
+            display = XOpenDisplay(displayname);
+            if (!display) {
+                readpng2_cleanup(&rpng2_info);
+                fprintf(stderr, PROGNAME ":  can't open X display [%s]\n",
+                  displayname? displayname : "default");
+                ++error;
+            }
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        exit(2);
+    }
+
+
    /* set the title-bar string, but make sure buffer doesn't overflow */

    alen = strlen(appname);
@@ -567,7 +579,7 @@ int main(int argc, char **argv)
    } else
        rpng2_info.need_bgcolor = TRUE;

-    rpng2_info.done = FALSE;
+    rpng2_info.state = kPreInit;
    rpng2_info.mainprog_init = rpng2_x_init;
    rpng2_info.mainprog_display_row = rpng2_x_display_row;
    rpng2_info.mainprog_finish_display = rpng2_x_finish_display;
@@ -587,10 +599,27 @@ int main(int argc, char **argv)
        if (readpng2_decode_data(&rpng2_info, inbuf, incount))
            ++error;
        Trace((stderr, "done with readpng2_decode_data()\n"))
-        if (error || feof(infile) || rpng2_info.done)
+
+        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {
+            if (rpng2_info.state == kDone) {
+                Trace((stderr, "done decoding PNG image\n"))
+            } else if (ferror(infile)) {
+                fprintf(stderr, PROGNAME
+                  ":  error while reading PNG image file\n");
+                exit(3);
+            } else if (feof(infile)) {
+                fprintf(stderr, PROGNAME ":  end of file reached "
+                  "(unexpectedly) while reading PNG image file\n");
+                exit(3);
+            } else /* if (error) */ {
+                // will print error message below
+            }
            break;
+        }
+
        if (timing)
            sleep(1);
+
        incount = fread(inbuf, 1, INBUFSIZE, infile);
    }

@@ -610,6 +639,7 @@ int main(int argc, char **argv)
 #ifdef FEATURE_LOOP

    if (loop && bg_image) {
+        Trace((stderr, "entering -loop loop (FEATURE_LOOP)\n"))
        for (;;) {
            int i, use_sleep;
            struct timeval now, then;
@@ -705,13 +735,20 @@ int main(int argc, char **argv)

    /* wait for the user to tell us when to quit */

-    do {
-        XNextEvent(display, &e);
-        if (e.type == Expose) {
-            XExposeEvent *ex = (XExposeEvent *)&e;
-            rpng2_x_redisplay_image (ex->x, ex->y, ex->width, ex->height);
-        }
-    } while (!QUIT(e,k));
+    if (rpng2_info.state >= kWindowInit) {
+        Trace((stderr, "entering final wait-for-quit-event loop\n"))
+        do {
+            XNextEvent(display, &e);
+            if (e.type == Expose) {
+                XExposeEvent *ex = (XExposeEvent *)&e;
+                rpng2_x_redisplay_image (ex->x, ex->y, ex->width, ex->height);
+            }
+        } while (!QUIT(e,k));
+    } else {
+        fprintf(stderr, PROGNAME ":  init callback never called:  probable "
+          "libpng error while decoding PNG metadata\n");
+        exit(4);
+    }


    /* we're done:  clean up all image and X resources and go away */
@@ -736,7 +773,7 @@ static void rpng2_x_init(void)
    ulg rowbytes = rpng2_info.rowbytes;

    Trace((stderr, "beginning rpng2_x_init()\n"))
-    Trace((stderr, "  rowbytes = %ld\n", rpng2_info.rowbytes))
+    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))
    Trace((stderr, "  width  = %ld\n", rpng2_info.width))
    Trace((stderr, "  height = %ld\n", rpng2_info.height))

@@ -773,6 +810,8 @@ static void rpng2_x_init(void)
        rpng2_x_cleanup();
        exit(2);
    }
+
+    rpng2_info.state = kWindowInit;
 }


@@ -1556,7 +1595,7 @@ static void rpng2_x_finish_display(void)
     * have nothing to do here except set a flag and let the user know that
     * the image is done */

-    rpng2_info.done = TRUE;
+    rpng2_info.state = kDone;
    printf(
      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
    fflush(stdout);
@@ -1581,9 +1620,9 @@ static void rpng2_x_redisplay_image(ulg startcol, ulg startrow,


    Trace((stderr, "beginning display loop (image_channels == %d)\n",
-      image_channels))
-    Trace((stderr, "   (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",
-      rpng2_info.width, image_rowbytes, ximage_rowbytes))
+      rpng2_info.channels))
+    Trace((stderr, "   (width = %ld, rowbytes = %d, ximage_rowbytes = %d)\n",
+      rpng2_info.width, rpng2_info.rowbytes, ximage_rowbytes))
    Trace((stderr, "   (bpp = %d)\n", ximage->bits_per_pixel))
    Trace((stderr, "   (byte_order = %s)\n", ximage->byte_order == MSBFirst?
      "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))
--- a/contrib/pngminim/decoder/README
+++ b/contrib/pngminim/decoder/README
@@ -1,6 +1,9 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h

-To build a minimal read-only decoder, run
+To build a minimal read-only decoder with embedded libpng and zlib, run
+
    gather.sh  # to collect needed files from pngminus, libpng, and zlib
-    make -f makefile.std
- 
+    make
+
+If you prefer to use the shared libraries, go to contrib/pngminus
+and build the png2pnm application there. 
--- a/contrib/pngminim/decoder/gather.sh
+++ b/contrib/pngminim/decoder/gather.sh
@@ -1,8 +1,8 @@
 cp ../../pngminus/png2pnm.c pngm2pnm.c
 cp ../../../*.h .
 cp ../../../*.c .
-rm example.c pnggccrd.c pngvcrd.c pngtest.c
+rm example.c pnggccrd.c pngvcrd.c pngtest.c pngpread.c pngw*.c
 # change the following 2 lines if zlib is somewhere else
 cp ../../../../zlib/*.h .
 cp ../../../../zlib/*.c .
-rm minigzip.c example.c compress.c deflate.c
+rm minigzip.c example.c compress.c deflate.c 
--- a/contrib/pngminim/decoder/makefile.std
+++ b/contrib/pngminim/decoder/makefile.std
@@ -20,7 +20,7 @@ ZOBJS  = adler32$(O) crc32$(O) gzio$(O) \
 	 trees$(O) uncompr$(O) zutil$(O)

 OBJS  = pngm2pnm$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
-	pngpread$(O) pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
+	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
 	pngset$(O) pngtrans$(O)  $(ZOBJS)

 # implicit make rules -------------------------------------------------------
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -1,12 +1,21 @@
 /* minrdpngconf.h: headers to make a minimal png-read-only library
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 2007 Glenn Randers-Pehrson
+ *
+ * Copyright (c) 2007, 2009 Glenn Randers-Pehrson
+ *
+ * This code is released under the zlib/libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
 * Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
 */

 #ifndef MINRDPNGCONF_H
 #define MINRDPNGCONF_H

+#ifdef NJET
+  /* No 16-bit support beyond reading with strip_16 */
+#endif
+
 #define PNG_NO_GLOBAL_ARRAYS

 #define PNG_NO_WARNINGS
@@ -26,6 +35,7 @@
 #define PNG_NO_READ_PACK
 #define PNG_NO_READ_PACKSWAP
 #define PNG_NO_READ_FILLER
+#define PNG_NO_READ_SWAP
 #define PNG_NO_READ_SWAP_ALPHA
 #define PNG_NO_READ_INVERT_ALPHA
 #define PNG_NO_READ_RGB_TO_GRAY
@@ -40,6 +50,7 @@
 #define PNG_NO_READ_sBIT
 #define PNG_NO_READ_sCAL
 #define PNG_NO_READ_sPLT
+#define PNG_NO_READ_sRGB
 #define PNG_NO_READ_TEXT
 #define PNG_NO_READ_tIME
 #define PNG_NO_READ_UNKNOWN_CHUNKS
--- a/contrib/pngminim/encoder/README
+++ b/contrib/pngminim/encoder/README
@@ -1,6 +1,9 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h

-To build a minimal write-only encoder, run
+To build a minimal write-only decoder with embedded libpng and zlib, run
+
    gather.sh  # to collect needed files from pngminus, libpng, and zlib
-    make -f makefile.std
+    make
 
+If you prefer to use the shared libraries, go to contrib/pngminus
+and build the pnm2png application there. 
--- a/contrib/pngminim/encoder/gather.sh
+++ b/contrib/pngminim/encoder/gather.sh
@@ -1,7 +1,7 @@
 cp ../../pngminus/pnm2png.c pnm2pngm.c
 cp ../../../*.h .
 cp ../../../*.c .
-rm example.c pnggccrd.c pngvcrd.c pngtest.c
+rm example.c pnggccrd.c pngvcrd.c pngtest.c pngr*.c pngpread.c
 # Change the next 2 lines if zlib is somewhere else.
 cp ../../../../zlib/*.h .
 cp ../../../../zlib/*.c .
--- a/contrib/pngminim/encoder/makefile.std
+++ b/contrib/pngminim/encoder/makefile.std
@@ -19,7 +19,6 @@ ZOBJS  = adler32$(O) compress$(O) crc32$(O) deflate$(O) gzio$(O) \
 	 trees$(O) uncompr$(O) zutil$(O)

 OBJS  = pnm2pngm$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
-	pngpread$(O) pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
 	pngset$(O) pngtrans$(O) pngwio$(O) pngwrite$(O) \
 	pngwtran$(O) pngwutil$(O) $(ZOBJS)

--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -1,6 +1,11 @@
 /* minwrpngconf.h: headers to make a minimal png-write-only library
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 2007 Glenn Randers-Pehrson
+ *
+ * Copyright (c) 2007, 2009 Glenn Randers-Pehrson
+ *
+ * This code is released under the zlib/libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
 * Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
 */

@@ -26,6 +31,7 @@
 #define PNG_NO_WRITE_PACK
 #define PNG_NO_WRITE_PACKSWAP
 #define PNG_NO_WRITE_FILLER
+#define PNG_NO_WRITE_SWAP
 #define PNG_NO_WRITE_SWAP_ALPHA
 #define PNG_NO_WRITE_INVERT_ALPHA
 #define PNG_NO_WRITE_RGB_TO_GRAY
@@ -33,7 +39,6 @@
 #define PNG_NO_WRITE_bKGD
 #define PNG_NO_WRITE_cHRM
 #define PNG_NO_WRITE_gAMA
-#define PNG_NO_WRITE_sRGB
 #define PNG_NO_WRITE_hIST
 #define PNG_NO_WRITE_iCCP
 #define PNG_NO_WRITE_oFFs
@@ -42,6 +47,7 @@
 #define PNG_NO_WRITE_sBIT
 #define PNG_NO_WRITE_sCAL
 #define PNG_NO_WRITE_sPLT
+#define PNG_NO_WRITE_sRGB
 #define PNG_NO_WRITE_TEXT
 #define PNG_NO_WRITE_tIME
 #define PNG_NO_WRITE_UNKNOWN_CHUNKS
@@ -51,6 +57,7 @@
 #define PNG_NO_WRITE_FILTER
 #define PNG_NO_WRITE_WEIGHTED_FILTER
 #define PNG_NO_WRITE_INTERLACING_SUPPORTED
+#define PNG_NO_WRITE_FLUSH

 #define PNG_NO_INFO_IMAGE
 #define PNG_NO_USER_MEM
--- a/contrib/pngminim/preader/README
+++ b/contrib/pngminim/preader/README
@@ -0,0 +1,14 @@
+This demonstrates the use of PNG_USER_CONFIG and pngusr.h
+
+To build a minimal read-only progressive decoder embedded libpng and
+zlib and with your system's X library, run
+
+    gather.sh # to collect needed files from gregbook, libpng, and zlib
+
+Edit makefile if required, to find your X library and include files,
+then
+    
+    make
+ 
+If you prefer to use the shared libraries, go to contrib/gregbook
+and build the rpng2-x application there. 
--- a/contrib/pngminim/preader/gather.sh
+++ b/contrib/pngminim/preader/gather.sh
@@ -0,0 +1,9 @@
+cp ../../gregbook/rpng2-x.c ../../gregbook/readpng2.[ch] .
+cp ../../gregbook/COPYING ../../gregbook/LICENSE .
+cp ../../../*.h .
+cp ../../../*.c .
+rm example.c pnggccrd.c pngvcrd.c pngtest.c pngw*.c
+# change the following 2 lines if zlib is somewhere else
+cp ../../../../zlib/*.h .
+cp ../../../../zlib/*.c .
+rm minigzip.c example.c compress.c deflate.c 
--- a/contrib/pngminim/preader/makefile
+++ b/contrib/pngminim/preader/makefile
@@ -0,0 +1,60 @@
+# Makefile for PngMinus (rpng2)
+# Linux / Unix
+
+#CC=cc
+CC=gcc
+LD=$(CC)
+
+RM=rm -f
+
+#XINC = -I/usr/include			# old-style, stock X distributions
+#XLIB = -L/usr/lib/X11 -lX11		#  (including SGI IRIX)
+
+#XINC = -I/usr/openwin/include		# Sun workstations (OpenWindows)
+#XLIB = -L/usr/openwin/lib -lX11
+
+XINC = -I/usr/X11R6/include		# new X distributions (X.org, etc.)
+XLIB = -L/usr/X11R6/lib -lX11
+#XLIB = -L/usr/X11R6/lib64 -lX11	# e.g., Red Hat on AMD64
+
+#XINC = -I/usr/local/include   		# FreeBSD
+#XLIB = -L/usr/local/lib -lX11
+
+#LIBS = $(XLIB)
+LIBS = $(XLIB) -lm                      #platforms that need libm
+
+CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP \
+       -DdeflateParams\(a,b,c\)=Z_OK -I. $(XINC) -O1
+
+C=.c
+O=.o
+L=.a
+E=
+
+ZOBJS  = adler32$(O) crc32$(O) gzio$(O) \
+	 infback$(O) inffast$(O) inflate$(O) inftrees$(O) \
+	 trees$(O) uncompr$(O) zutil$(O)
+
+OBJS  = rpng2-x$(O) readpng2$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
+	pngpread$(O) pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
+	pngset$(O) pngtrans$(O)  $(ZOBJS)
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O): png.h pngconf.h readpng2.h pngusr.h zlib.h
+	$(CC) -c $(CFLAGS) $<
+
+# dependencies
+
+all: rpng2-x$(E)
+
+rpng2-x$(E): $(OBJS)
+	$(LD) -o rpng2-x$(E) $(OBJS) $(LIBS)
+	strip rpng2-x$(E)
+
+clean:
+	$(RM) rpng2-x$(O)
+	$(RM) rpng2-x$(E)
+	$(RM) $(OBJS)
+
+# End of makefile for rpng2-x
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -0,0 +1,68 @@
+/* minrdpngconf.h: headers to make a minimal png-read-only library
+ *
+ * Copyright (c) 2009 Glenn Randers-Pehrson
+ *
+ * This code is released under the zlib/libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
+ */
+
+#ifndef MINPRDPNGCONF_H
+#define MINPRDPNGCONF_H
+
+#define PNG_NO_GLOBAL_ARRAYS
+
+#define PNG_NO_WARNINGS
+#define png_warning(s1,s2) ""
+#define png_chunk_warning(s1,s2) ""
+#define PNG_NO_ERROR_TEXT
+#define png_error(s1,s2) png_err(s1)
+#define png_chunk_error(s1,s2) png_err(s1)
+
+#define PNG_NO_ASSEMBLER_CODE
+#define PNG_NO_OPTIMIZED_CODE
+#define PNG_NO_READ_DITHER
+#define PNG_NO_READ_INVERT
+#define PNG_NO_READ_SHIFT
+#define PNG_NO_READ_PACK
+#define PNG_NO_READ_PACKSWAP
+#define PNG_NO_READ_FILLER
+#define PNG_NO_READ_SWAP
+#define PNG_NO_READ_SWAP_ALPHA
+#define PNG_NO_READ_INVERT_ALPHA
+#define PNG_NO_READ_RGB_TO_GRAY
+#define PNG_NO_READ_USER_TRANSFORM
+#define PNG_NO_READ_cHRM
+#define PNG_NO_READ_hIST
+#define PNG_NO_READ_iCCP
+#define PNG_NO_READ_pCAL
+#define PNG_NO_READ_pHYs
+#define PNG_NO_READ_sBIT
+#define PNG_NO_READ_sCAL
+#define PNG_NO_READ_sPLT
+#define PNG_NO_READ_TEXT
+#define PNG_NO_READ_tIME
+#define PNG_NO_READ_UNKNOWN_CHUNKS
+#define PNG_NO_READ_USER_CHUNKS
+#define PNG_NO_READ_EMPTY_PLTE
+#define PNG_NO_READ_OPT_PLTE
+#define PNG_NO_READ_STRIP_ALPHA
+#define PNG_NO_READ_oFFs
+#define PNG_NO_WARN_UNINITIALIZED_ROW
+
+#define PNG_NO_WRITE_SUPPORTED
+
+#define PNG_NO_INFO_IMAGE
+#define PNG_NO_USER_MEM
+#define PNG_NO_FIXED_POINT_SUPPORTED
+#define PNG_NO_MNG_FEATURES
+#define PNG_NO_USER_TRANSFORM_PTR
+#define PNG_NO_HANDLE_AS_UNKNOWN
+#define PNG_NO_CONSOLE_IO
+#define PNG_NO_ZALLOC_ZERO
+#define PNG_NO_ERROR_NUMBERS
+#define PNG_NO_EASY_ACCESS
+
+#endif /* MINPRDPNGCONF_H */
--- a/contrib/visupng/PngFile.c
+++ b/contrib/visupng/PngFile.c
@@ -2,8 +2,11 @@
 //  PNGFILE.C -- Image File Functions
 //-------------------------------------

-// Copyright 2000, Willem van Schaik.  For conditions of distribution and
-// use, see the copyright/license/disclaimer notice in png.h
+// Copyright 2000, Willem van Schaik.
+//
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h

 #include <windows.h>
 #include <commdlg.h>
--- a/contrib/visupng/PngFile.h
+++ b/contrib/visupng/PngFile.h
@@ -2,8 +2,11 @@
 //  PNGFILE.H -- Header File for pngfile.c
 //------------------------------------------

-// Copyright 2000, Willem van Schaik.  For conditions of distribution and
-// use, see the copyright/license/disclaimer notice in png.h
+// Copyright 2000, Willem van Schaik.
+
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h

 #include <stdio.h>
 #include <stdlib.h>
--- a/contrib/visupng/README.txt
+++ b/contrib/visupng/README.txt
@@ -1,8 +1,11 @@
 Microsoft Developer Studio Build File, Format Version 6.00 for VisualPng
 ------------------------------------------------------------------------

-Copyright 2000, Willem van Schaik.  For conditions of distribution and
-use, see the copyright/license/disclaimer notice in png.h
+Copyright 2000, Willem van Schaik.
+
+This code is released under the libpng license.
+For conditions of distribution and use, see the disclaimer
+and license in png.h

 As a PNG .dll demo VisualPng is finished. More features would only hinder
 the program's objective. However, further extensions (like support for other 
--- a/contrib/visupng/VisualPng.c
+++ b/contrib/visupng/VisualPng.c
@@ -2,8 +2,11 @@
 //  VisualPng.C -- Shows a PNG image
 //------------------------------------

-// Copyright 2000, Willem van Schaik.  For conditions of distribution and
-// use, see the copyright/license/disclaimer notice in png.h
+// Copyright 2000, Willem van Schaik.
+
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h

 // switches

--- a/contrib/visupng/cexcept.h
+++ b/contrib/visupng/cexcept.h
@@ -1,25 +1,30 @@
 /*===
-cexcept.h 2.0.0 (2001-Jul-12-Thu)
-Adam M. Costello <amc@cs.berkeley.edu>
+cexcept.h 2.0.1 (2008-Jul-19-Sat)
+http://www.nicemice.net/cexcept/
+Adam M. Costello
+http://www.nicemice.net/amc/

 An interface for exception-handling in ANSI C (C89 and subsequent ISO
-standards), developed jointly with Cosmin Truta <cosmin@cs.toronto.edu>.
+standards), developed jointly with Cosmin Truta.

-    Copyright (c) 2001 Adam M. Costello and Cosmin Truta.  Everyone
-    is hereby granted permission to do whatever they like with this
-    file, provided that if they modify it they take reasonable steps to
-    avoid confusing or misleading people about the authors, version,
-    and terms of use of the derived file.  The copyright holders make
-    no guarantees regarding this file, and are not responsible for any
-    damage resulting from its use.
+    Copyright (c) 2000-2008 Adam M. Costello and Cosmin Truta.
+    This software may be modified only if its author and version
+    information is updated accurately, and may be redistributed
+    only if accompanied by this unaltered notice.  Subject to those
+    restrictions, permission is granted to anyone to do anything
+    with this software.  The copyright holders make no guarantees
+    regarding this software, and are not responsible for any damage
+    resulting from its use.

-Only user-defined exceptions are supported, not "real" exceptions like
-division by zero or memory segmentation violations.
+The cexcept interface is not compatible with and cannot interact
+with system exceptions (like division by zero or memory segmentation
+violation), compiler-generated exceptions (like C++ exceptions), or
+other exception-handling interfaces.

-If this interface is used by multiple .c files, they shouldn't include
+When using this interface across multiple .c files, do not include
 this header file directly.  Instead, create a wrapper header file that
 includes this header file and then invokes the define_exception_type
-macro (see below), and let your .c files include that header file.
+macro (see below).  The .c files should then include that header file.

 The interface consists of one type, one well-known name, and six macros.

@@ -164,7 +169,7 @@ Throw expression;
    be compatible with the type passed to define_exception_type().  The
    exception must be caught, otherwise the program may crash.

-    Slight limitation:  If the expression is a comma-expression it must
+    Slight limitation:  If the expression is a comma-expression, it must
    be enclosed in parentheses.


@@ -209,11 +214,11 @@ struct exception_context { \
    exception__prev = the_exception_context->penv; \
    the_exception_context->penv = &exception__env; \
    if (setjmp(exception__env) == 0) { \
-      if (&exception__prev)
+      do

 #define exception__catch(action) \
-      else { } \
-      the_exception_context->caught = 0; \
+      while (the_exception_context->caught = 0, \
+             the_exception_context->caught); \
    } \
    else { \
      the_exception_context->caught = 1; \
@@ -226,14 +231,14 @@ struct exception_context { \
 #define Catch(e) exception__catch(((e) = the_exception_context->v.etmp, 0))
 #define Catch_anonymous exception__catch(0)

-/* Try ends with if(), and Catch begins and ends with else.  This     */
-/* ensures that the Try/Catch syntax is really the same as the        */
-/* if/else syntax.                                                    */
+/* Try ends with do, and Catch begins with while(0) and ends with     */
+/* else, to ensure that Try/Catch syntax is similar to if/else        */
+/* syntax.                                                            */
 /*                                                                    */
-/* We use &exception__prev instead of 1 to appease compilers that     */
-/* warn about constant expressions inside if().  Most compilers       */
-/* should still recognize that &exception__prev is never zero and     */
-/* avoid generating test code.                                        */
+/* The 0 in while(0) is expressed as x=0,x in order to appease        */
+/* compilers that warn about constant expressions inside while().     */
+/* Most compilers should still recognize that the condition is always */
+/* false and avoid generating code for it.                            */

 #define Throw \
  for (;; longjmp(*the_exception_context->penv, 1)) \
--- a/499
+++ b/499
@@ -1,7 +1,10 @@
 #! /bin/sh
-
 # depcomp - compile a program generating dependencies as side-effects
-# Copyright 1999, 2000 Free Software Foundation, Inc.
+
+scriptversion=2009-04-28.21; # UTC
+
+# Copyright (C) 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2009 Free
+# Software Foundation, Inc.

 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -14,9 +17,7 @@
 # GNU General Public License for more details.

 # You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-# 02111-1307, USA.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
@@ -25,13 +26,45 @@

 # Originally written by Alexandre Oliva <oliva@dcc.unicamp.br>.

+case $1 in
+  '')
+     echo "$0: No command.  Try \`$0 --help' for more information." 1>&2
+     exit 1;
+     ;;
+  -h | --h*)
+    cat <<\EOF
+Usage: depcomp [--help] [--version] PROGRAM [ARGS]
+
+Run PROGRAMS ARGS to compile a file, generating dependencies
+as side-effects.
+
+Environment variables:
+  depmode     Dependency tracking mode.
+  source      Source file read by `PROGRAMS ARGS'.
+  object      Object file output by `PROGRAMS ARGS'.
+  DEPDIR      directory where to store dependencies.
+  depfile     Dependency file to output.
+  tmpdepfile  Temporary file to use when outputing dependencies.
+  libtool     Whether libtool is used (yes/no).
+
+Report bugs to <bug-automake@gnu.org>.
+EOF
+    exit $?
+    ;;
+  -v | --v*)
+    echo "depcomp $scriptversion"
+    exit $?
+    ;;
+esac
+
 if test -z "$depmode" || test -z "$source" || test -z "$object"; then
  echo "depcomp: Variables source, object and depmode must be set" 1>&2
  exit 1
 fi
-# `libtool' can also be set to `yes' or `no'.

-depfile=${depfile-`echo "$object" | sed 's,\([^/]*\)$,.deps/\1,;s/\.\([^.]*\)$/.P\1/'`}
+# Dependencies for sub/bar.o or sub/bar.obj go into sub/.deps/bar.Po.
+depfile=${depfile-`echo "$object" |
+  sed 's|[^\\/]*$|'${DEPDIR-.deps}'/&|;s|\.\([^.]*\)$|.P\1|;s|Pobj$|Po|'`}
 tmpdepfile=${tmpdepfile-`echo "$depfile" | sed 's/\.\([^.]*\)$/.T\1/'`}

 rm -f "$tmpdepfile"
@@ -52,12 +85,34 @@ if test "$depmode" = dashXmstdout; then
   depmode=dashmstdout
 fi

+cygpath_u="cygpath -u -f -"
+if test "$depmode" = msvcmsys; then
+   # This is just like msvisualcpp but w/o cygpath translation.
+   # Just convert the backslash-escaped backslashes to single forward
+   # slashes to satisfy depend.m4
+   cygpath_u="sed s,\\\\\\\\,/,g"
+   depmode=msvisualcpp
+fi
+
 case "$depmode" in
 gcc3)
 ## gcc 3 implements dependency tracking that does exactly what
 ## we want.  Yay!  Note: for some reason libtool 1.4 doesn't like
 ## it if -MD -MP comes after the -MF stuff.  Hmm.
-  "$@" -MT "$object" -MD -MP -MF "$tmpdepfile"
+## Unfortunately, FreeBSD c89 acceptance of flags depends upon
+## the command line argument order; so add the flags where they
+## appear in depend2.am.  Note that the slowdown incurred here
+## affects only configure: in makefiles, %FASTDEP% shortcuts this.
+  for arg
+  do
+    case $arg in
+    -c) set fnord "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" "$arg" ;;
+    *)  set fnord "$@" "$arg" ;;
+    esac
+    shift # fnord
+    shift # $arg
+  done
+  "$@"
  stat=$?
  if test $stat -eq 0; then :
  else
@@ -144,14 +199,14 @@ sgi)
 ' < "$tmpdepfile" \
    | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' | \
    tr '
-' ' ' >> $depfile
-    echo >> $depfile
+' ' ' >> "$depfile"
+    echo >> "$depfile"

    # The second pass generates a dummy entry for each header file.
    tr ' ' '
 ' < "$tmpdepfile" \
   | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \
-   >> $depfile
+   >> "$depfile"
  else
    # The sourcefile does not contain any dependencies, so just
    # store a dummy comment line, to avoid errors with the Makefile
@@ -163,31 +218,43 @@ sgi)

 aix)
  # The C for AIX Compiler uses -M and outputs the dependencies
-  # in a .u file.  This file always lives in the current directory.
-  # Also, the AIX compiler puts `$object:' at the start of each line;
-  # $object doesn't have directory information.
-  stripped=`echo "$object" | sed -e 's,^.*/,,' -e 's/\(.*\)\..*$/\1/'`
-  tmpdepfile="$stripped.u"
-  outname="$stripped.o"
+  # in a .u file.  In older versions, this file always lives in the
+  # current directory.  Also, the AIX compiler puts `$object:' at the
+  # start of each line; $object doesn't have directory information.
+  # Version 6 uses the directory in both cases.
+  dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+  test "x$dir" = "x$object" && dir=
+  base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$base.u
+    tmpdepfile3=$dir.libs/$base.u
    "$@" -Wc,-M
  else
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$dir$base.u
+    tmpdepfile3=$dir$base.u
    "$@" -M
  fi
-
  stat=$?
+
  if test $stat -eq 0; then :
  else
-    rm -f "$tmpdepfile"
+    rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
    exit $stat
  fi

+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+  do
+    test -f "$tmpdepfile" && break
+  done
  if test -f "$tmpdepfile"; then
    # Each line is of the form `foo.o: dependent.h'.
    # Do two passes, one to just change these to
    # `$object: dependent.h' and one to simply `dependent.h:'.
-    sed -e "s,^$outname:,$object :," < "$tmpdepfile" > "$depfile"
-    sed -e "s,^$outname: \(.*\)$,\1:," < "$tmpdepfile" >> "$depfile"
+    sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
+    # That's a tab and a space in the [].
+    sed -e 's,^.*\.[a-z]*:[	 ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
  else
    # The sourcefile does not contain any dependencies, so just
    # store a dummy comment line, to avoid errors with the Makefile
@@ -197,37 +264,141 @@ aix)
  rm -f "$tmpdepfile"
  ;;

+icc)
+  # Intel's C compiler understands `-MD -MF file'.  However on
+  #    icc -MD -MF foo.d -c -o sub/foo.o sub/foo.c
+  # ICC 7.0 will fill foo.d with something like
+  #    foo.o: sub/foo.c
+  #    foo.o: sub/foo.h
+  # which is wrong.  We want:
+  #    sub/foo.o: sub/foo.c
+  #    sub/foo.o: sub/foo.h
+  #    sub/foo.c:
+  #    sub/foo.h:
+  # ICC 7.1 will output
+  #    foo.o: sub/foo.c sub/foo.h
+  # and will wrap long lines using \ :
+  #    foo.o: sub/foo.c ... \
+  #     sub/foo.h ... \
+  #     ...
+
+  "$@" -MD -MF "$tmpdepfile"
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  # Each line is of the form `foo.o: dependent.h',
+  # or `foo.o: dep1.h dep2.h \', or ` dep3.h dep4.h \'.
+  # Do two passes, one to just change these to
+  # `$object: dependent.h' and one to simply `dependent.h:'.
+  sed "s,^[^:]*:,$object :," < "$tmpdepfile" > "$depfile"
+  # Some versions of the HPUX 10.20 sed can't process this invocation
+  # correctly.  Breaking it into two sed invocations is a workaround.
+  sed 's,^[^:]*: \(.*\)$,\1,;s/^\\$//;/^$/d;/:$/d' < "$tmpdepfile" |
+    sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+hp2)
+  # The "hp" stanza above does not work with aCC (C++) and HP's ia64
+  # compilers, which have integrated preprocessors.  The correct option
+  # to use with these is +Maked; it writes dependencies to a file named
+  # 'foo.d', which lands next to the object file, wherever that
+  # happens to be.
+  # Much of this is similar to the tru64 case; see comments there.
+  dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+  test "x$dir" = "x$object" && dir=
+  base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
+  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir.libs/$base.d
+    "$@" -Wc,+Maked
+  else
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir$base.d
+    "$@" +Maked
+  fi
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+     rm -f "$tmpdepfile1" "$tmpdepfile2"
+     exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  if test -f "$tmpdepfile"; then
+    sed -e "s,^.*\.[a-z]*:,$object:," "$tmpdepfile" > "$depfile"
+    # Add `dependent.h:' lines.
+    sed -ne '2,${
+	       s/^ *//
+	       s/ \\*$//
+	       s/$/:/
+	       p
+	     }' "$tmpdepfile" >> "$depfile"
+  else
+    echo "#dummy" > "$depfile"
+  fi
+  rm -f "$tmpdepfile" "$tmpdepfile2"
+  ;;
+
 tru64)
-   # The Tru64 AIX compiler uses -MD to generate dependencies as a side
+   # The Tru64 compiler uses -MD to generate dependencies as a side
   # effect.  `cc -MD -o foo.o ...' puts the dependencies into `foo.o.d'.
-   # At least on Alpha/Redhat 6.1, Compaq CCC V6.2-504 seems to put 
+   # At least on Alpha/Redhat 6.1, Compaq CCC V6.2-504 seems to put
   # dependencies in `foo.d' instead, so we check for that too.
   # Subdirectories are respected.
+   dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+   test "x$dir" = "x$object" && dir=
+   base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`

-   tmpdepfile1="$object.d"
-   tmpdepfile2=`echo "$object" | sed -e 's/.o$/.d/'` 
   if test "$libtool" = yes; then
+      # With Tru64 cc, shared objects can also be used to make a
+      # static library.  This mechanism is used in libtool 1.4 series to
+      # handle both shared and static libraries in a single compilation.
+      # With libtool 1.4, dependencies were output in $dir.libs/$base.lo.d.
+      #
+      # With libtool 1.5 this exception was removed, and libtool now
+      # generates 2 separate objects for the 2 libraries.  These two
+      # compilations output dependencies in $dir.libs/$base.o.d and
+      # in $dir$base.o.d.  We have to check for both files, because
+      # one of the two compilations can be disabled.  We should prefer
+      # $dir$base.o.d over $dir.libs/$base.o.d because the latter is
+      # automatically cleaned when .libs/ is deleted, while ignoring
+      # the former would cause a distcleancheck panic.
+      tmpdepfile1=$dir.libs/$base.lo.d   # libtool 1.4
+      tmpdepfile2=$dir$base.o.d          # libtool 1.5
+      tmpdepfile3=$dir.libs/$base.o.d    # libtool 1.5
+      tmpdepfile4=$dir.libs/$base.d      # Compaq CCC V6.2-504
      "$@" -Wc,-MD
   else
+      tmpdepfile1=$dir$base.o.d
+      tmpdepfile2=$dir$base.d
+      tmpdepfile3=$dir$base.d
+      tmpdepfile4=$dir$base.d
      "$@" -MD
   fi

   stat=$?
   if test $stat -eq 0; then :
   else
-      rm -f "$tmpdepfile1" "$tmpdepfile2"
+      rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
      exit $stat
   fi

-   if test -f "$tmpdepfile1"; then
-      tmpdepfile="$tmpdepfile1"
-   else
-      tmpdepfile="$tmpdepfile2"
-   fi
+   for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
+   do
+     test -f "$tmpdepfile" && break
+   done
   if test -f "$tmpdepfile"; then
      sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
-      # That's a space and a tab in the [].
-      sed -e 's,^.*\.[a-z]*:[ 	]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
+      # That's a tab and a space in the [].
+      sed -e 's,^.*\.[a-z]*:[	 ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
   else
      echo "#dummy" > "$depfile"
   fi
@@ -240,34 +411,42 @@ tru64)

 dashmstdout)
  # Important note: in order to support this mode, a compiler *must*
-  # always write the proprocessed file to stdout, regardless of -o,
-  # because we must use -o when running libtool.
-  test -z "$dashmflag" && dashmflag=-M
-  ( IFS=" "
-    case " $* " in
-    *" --mode=compile "*) # this is libtool, let us make it quiet
-      for arg
-      do # cycle over the arguments
-        case "$arg" in
-	"--mode=compile")
-	  # insert --quiet before "--mode=compile"
-	  set fnord "$@" --quiet
-	  shift # fnord
-	  ;;
-	esac
-	set fnord "$@" "$arg"
-	shift # fnord
-	shift # "$arg"
-      done
+  # always write the preprocessed file to stdout, regardless of -o.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove `-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
      ;;
    esac
-    "$@" $dashmflag | sed 's:^[^:]*\:[ 	]*:'"$object"'\: :' > "$tmpdepfile"
-  ) &
-  proc=$!
-  "$@"
-  stat=$?
-  wait "$proc"
-  if test "$stat" != 0; then exit $stat; fi
+  done
+
+  test -z "$dashmflag" && dashmflag=-M
+  # Require at least two characters before searching for `:'
+  # in the target name.  This is to cope with DOS-style filenames:
+  # a dependency such as `c:/foo/bar' could be seen as target `c' otherwise.
+  "$@" $dashmflag |
+    sed 's:^[  ]*[^: ][^:][^:]*\:[    ]*:'"$object"'\: :' > "$tmpdepfile"
  rm -f "$depfile"
  cat < "$tmpdepfile" > "$depfile"
  tr ' ' '
@@ -285,36 +464,47 @@ dashXmstdout)
  ;;

 makedepend)
-  # X makedepend
-  (
-    shift
-    cleared=no
-    for arg in "$@"; do
-      case $cleared in no)
-        set ""; shift
-	cleared=yes
-      esac
-      case "$arg" in
-        -D*|-I*)
-	  set fnord "$@" "$arg"; shift;;
-	-*)
-	  ;;
-	*)
-	  set fnord "$@" "$arg"; shift;;
-      esac
+  "$@" || exit $?
+  # Remove any Libtool call
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
    done
-    obj_suffix="`echo $object | sed 's/^.*\././'`"
-    touch "$tmpdepfile"
-    ${MAKEDEPEND-makedepend} 2>/dev/null -o"$obj_suffix" -f"$tmpdepfile" "$@"
-  ) &
-  proc=$!
-  "$@"
-  stat=$?
-  wait "$proc"
-  if test "$stat" != 0; then exit $stat; fi
+    shift
+  fi
+  # X makedepend
+  shift
+  cleared=no eat=no
+  for arg
+  do
+    case $cleared in
+    no)
+      set ""; shift
+      cleared=yes ;;
+    esac
+    if test $eat = yes; then
+      eat=no
+      continue
+    fi
+    case "$arg" in
+    -D*|-I*)
+      set fnord "$@" "$arg"; shift ;;
+    # Strip any option that makedepend may not understand.  Remove
+    # the object too, otherwise makedepend will parse it as a source file.
+    -arch)
+      eat=yes ;;
+    -*|$object)
+      ;;
+    *)
+      set fnord "$@" "$arg"; shift ;;
+    esac
+  done
+  obj_suffix=`echo "$object" | sed 's/^.*\././'`
+  touch "$tmpdepfile"
+  ${MAKEDEPEND-makedepend} -o"$obj_suffix" -f"$tmpdepfile" "$@"
  rm -f "$depfile"
  cat < "$tmpdepfile" > "$depfile"
-  tail +3 "$tmpdepfile" | tr ' ' '
+  sed '1,2d' "$tmpdepfile" | tr ' ' '
 ' | \
 ## Some versions of the HPUX 10.20 sed can't process this invocation
 ## correctly.  Breaking it into two sed invocations is a workaround.
@@ -324,35 +514,40 @@ makedepend)

 cpp)
  # Important note: in order to support this mode, a compiler *must*
-  # always write the proprocessed file to stdout, regardless of -o,
-  # because we must use -o when running libtool.
-  ( IFS=" "
-    case " $* " in
-    *" --mode=compile "*)
-      for arg
-      do # cycle over the arguments
-        case $arg in
-	"--mode=compile")
-	  # insert --quiet before "--mode=compile"
-	  set fnord "$@" --quiet
-	  shift # fnord
-	  ;;
-	esac
-	set fnord "$@" "$arg"
-	shift # fnord
-	shift # "$arg"
-      done
+  # always write the preprocessed file to stdout.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove `-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
      ;;
    esac
-    "$@" -E |
-    sed -n '/^# [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' |
+  done
+
+  "$@" -E |
+    sed -n -e '/^# [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \
+       -e '/^#line [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' |
    sed '$ s: \\$::' > "$tmpdepfile"
-  ) &
-  proc=$!
-  "$@"
-  stat=$?
-  wait "$proc"
-  if test "$stat" != 0; then exit $stat; fi
  rm -f "$depfile"
  echo "$object : \\" > "$depfile"
  cat < "$tmpdepfile" >> "$depfile"
@@ -362,42 +557,56 @@ cpp)

 msvisualcpp)
  # Important note: in order to support this mode, a compiler *must*
-  # always write the proprocessed file to stdout, regardless of -o,
-  # because we must use -o when running libtool.
-  ( IFS=" "
-    case " $* " in
-    *" --mode=compile "*)
-      for arg
-      do # cycle over the arguments
-        case $arg in
-	"--mode=compile")
-	  # insert --quiet before "--mode=compile"
-	  set fnord "$@" --quiet
-	  shift # fnord
-	  ;;
-	esac
-	set fnord "$@" "$arg"
-	shift # fnord
-	shift # "$arg"
-      done
+  # always write the preprocessed file to stdout.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  IFS=" "
+  for arg
+  do
+    case "$arg" in
+    -o)
+      shift
      ;;
+    $object)
+      shift
+      ;;
+    "-Gm"|"/Gm"|"-Gi"|"/Gi"|"-ZI"|"/ZI")
+	set fnord "$@"
+	shift
+	shift
+	;;
+    *)
+	set fnord "$@" "$arg"
+	shift
+	shift
+	;;
    esac
-    "$@" -E |
-    sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::echo "`cygpath -u \\"\1\\"`":p' | sort | uniq > "$tmpdepfile"
-  ) &
-  proc=$!
-  "$@"
-  stat=$?
-  wait "$proc"
-  if test "$stat" != 0; then exit $stat; fi
+  done
+  "$@" -E 2>/dev/null |
+  sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::\1:p' | $cygpath_u | sort -u > "$tmpdepfile"
  rm -f "$depfile"
  echo "$object : \\" > "$depfile"
-  . "$tmpdepfile" | sed 's% %\\ %g' | sed -n '/^\(.*\)$/ s::	\1 \\:p' >> "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::	\1 \\:p' >> "$depfile"
  echo "	" >> "$depfile"
-  . "$tmpdepfile" | sed 's% %\\ %g' | sed -n '/^\(.*\)$/ s::\1\::p' >> "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::\1\::p' >> "$depfile"
  rm -f "$tmpdepfile"
  ;;

+msvcmsys)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
 none)
  exec "$@"
  ;;
@@ -409,3 +618,13 @@ none)
 esac

 exit 0
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:
--- a/example.c
+++ b/example.c
@@ -2,9 +2,9 @@
 #if 0 /* in case someone actually tries to compile this */

 /* example.c - an example of using libpng
- * Last changed in libpng 1.2.1 December 7, 2001.
+ * Last changed in libpng 1.2.37 [June 4, 2009]
 * This file has been placed in the public domain by the authors.
- * Maintained 1998-2007 Glenn Randers-Pehrson
+ * Maintained 1998-2009 Glenn Randers-Pehrson
 * Maintained 1996, 1997 Andreas Dilger)
 * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
@@ -91,14 +91,15 @@ void read_png(char *file_name)  /* We need to open the file */

   if ((fp = fopen(file_name, "rb")) == NULL)
      return (ERROR);
+
 #else no_open_file /* prototype 2 */
-void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
+void read_png(FILE *fp, unsigned int sig_read)  /* File is already open */
 {
   png_structp png_ptr;
   png_infop info_ptr;
   png_uint_32 width, height;
   int bit_depth, color_type, interlace_type;
-#endif no_open_file /* only use one prototype! */
+#endif no_open_file /* Only use one prototype! */

   /* Create and initialize the png_struct with the desired error handler
    * functions.  If you want to use the default stderr and longjump method,
@@ -164,6 +165,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    * pixels) into the info structure with this call:
    */
   png_read_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
+
 #else
   /* OK, you're doing it the hard way, with the lower-level functions */

@@ -175,13 +177,13 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
   png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
       &interlace_type, int_p_NULL, int_p_NULL);

-/* Set up the data transformations you want.  Note that these are all
- * optional.  Only call them if you want/need them.  Many of the
- * transformations only work on specific types of images, and many
- * are mutually exclusive.
- */
+   /* Set up the data transformations you want.  Note that these are all
+    * optional.  Only call them if you want/need them.  Many of the
+    * transformations only work on specific types of images, and many
+    * are mutually exclusive.
+    */

-   /* tell libpng to strip 16 bit/color files down to 8 bits/color */
+   /* Tell libpng to strip 16 bit/color files down to 8 bits/color */
   png_set_strip_16(png_ptr);

   /* Strip alpha bytes from the input data without combining with the
@@ -204,7 +206,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */

   /* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
   if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
-      png_set_gray_1_2_4_to_8(png_ptr);
+      png_set_expand_gray_1_2_4_to_8(png_ptr);

   /* Expand paletted or RGB images with transparency to full alpha channels
    * so the data will be available as RGBA quartets.
@@ -228,10 +230,11 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
      png_set_background(png_ptr, &my_background,
                         PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);

-   /* Some suggestions as to how to get a screen gamma value */
-
-   /* Note that screen gamma is the display_exponent, which includes
-    * the CRT_exponent and any correction for viewing conditions */
+   /* Some suggestions as to how to get a screen gamma value
+    *
+    * Note that screen gamma is the display_exponent, which includes
+    * the CRT_exponent and any correction for viewing conditions
+    */
   if (/* We have a user-defined screen gamma value */)
   {
      screen_gamma = user-defined screen_gamma;
@@ -244,7 +247,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
   /* If we don't have another value */
   else
   {
-      screen_gamma = 2.2;  /* A good guess for a PC monitors in a dimly
+      screen_gamma = 2.2;  /* A good guess for a PC monitor in a dimly
                              lit room */
      screen_gamma = 1.7 or 1.0;  /* A good guess for Mac systems */
   }
@@ -277,7 +280,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
      png_colorp palette;

      /* This reduces the image to the application supplied palette */
-      if (/* we have our own palette */)
+      if (/* We have our own palette */)
      {
         /* An array of colors to which the image should be dithered */
         png_color std_color_cube[MAX_SCREEN_COLORS];
@@ -297,7 +300,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
      }
   }

-   /* invert monochrome files to have 0 as white and 1 as black */
+   /* Invert monochrome files to have 0 as white and 1 as black */
   png_set_invert_mono(png_ptr);

   /* If you want to shift the pixel values from the range [0,255] or
@@ -306,20 +309,20 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    */
   if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
   {
-      png_color_8p sig_bit;
+      png_color_8p sig_bit_p;

-      png_get_sBIT(png_ptr, info_ptr, &sig_bit);
-      png_set_shift(png_ptr, sig_bit);
+      png_get_sBIT(png_ptr, info_ptr, &sig_bit_p);
+      png_set_shift(png_ptr, sig_bit_p);
   }

-   /* flip the RGB pixels to BGR (or RGBA to BGRA) */
+   /* Flip the RGB pixels to BGR (or RGBA to BGRA) */
   if (color_type & PNG_COLOR_MASK_COLOR)
      png_set_bgr(png_ptr);

-   /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
+   /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
   png_set_swap_alpha(png_ptr);

-   /* swap bytes of 16 bit files to least significant byte first */
+   /* Swap bytes of 16 bit files to least significant byte first */
   png_set_swap(png_ptr);

   /* Add filler (or alpha) byte (before/after each RGB triplet) */
@@ -342,11 +345,13 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
   /* The easiest way to read the image: */
   png_bytep row_pointers[height];

+   /* Clear the pointer array */
+   for (row = 0; row < height; row++)
+      row_pointers[row] = NULL;
+
   for (row = 0; row < height; row++)
-   {
      row_pointers[row] = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
         info_ptr));
-   }

   /* Now it's time to read the image.  One of these methods is REQUIRED */
 #ifdef entire /* Read the entire image in one go */
@@ -372,32 +377,31 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 #else no_sparkle /* Read the image using the "rectangle" effect */
         png_read_rows(png_ptr, png_bytepp_NULL, &row_pointers[y],
            number_of_rows);
-#endif no_sparkle /* use only one of these two methods */
+#endif no_sparkle /* Use only one of these two methods */
      }

-      /* if you want to display the image after every pass, do
-         so here */
-#endif no_single /* use only one of these two methods */
+      /* If you want to display the image after every pass, do so here */
+#endif no_single /* Use only one of these two methods */
   }
-#endif no_entire /* use only one of these two methods */
+#endif no_entire /* Use only one of these two methods */

-   /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
   png_read_end(png_ptr, info_ptr);
 #endif hilevel

   /* At this point you have read the entire image */

-   /* clean up after the read, and free any memory allocated - REQUIRED */
+   /* Clean up after the read, and free any memory allocated - REQUIRED */
   png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);

-   /* close the file */
+   /* Close the file */
   fclose(fp);

-   /* that's it */
+   /* That's it */
   return (OK);
 }

-/* progressively read a file */
+/* Progressively read a file */

 int
 initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
@@ -462,7 +466,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,

   /* This one's new also.  Simply give it chunks of data as
    * they arrive from the data stream (in order, of course).
-    * On Segmented machines, don't give it any more than 64K.
+    * On segmented machines, don't give it any more than 64K.
    * The library seems to run fine with sizes of 4K, although
    * you can give it much less if necessary (I assume you can
    * give it chunks of 1 byte, but I haven't tried with less
@@ -476,36 +480,37 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,

 info_callback(png_structp png_ptr, png_infop info)
 {
-/* do any setup here, including setting any of the transformations
- * mentioned in the Reading PNG files section.  For now, you _must_
- * call either png_start_read_image() or png_read_update_info()
- * after all the transformations are set (even if you don't set
- * any).  You may start getting rows before png_process_data()
- * returns, so this is your last chance to prepare for that.
- */
+   /* Do any setup here, including setting any of the transformations
+    * mentioned in the Reading PNG files section.  For now, you _must_
+    * call either png_start_read_image() or png_read_update_info()
+    * after all the transformations are set (even if you don't set
+    * any).  You may start getting rows before png_process_data()
+    * returns, so this is your last chance to prepare for that.
+    */
 }

 row_callback(png_structp png_ptr, png_bytep new_row,
   png_uint_32 row_num, int pass)
 {
-/*
- * This function is called for every row in the image.  If the
- * image is interlaced, and you turned on the interlace handler,
- * this function will be called for every row in every pass.
- *
- * In this function you will receive a pointer to new row data from
- * libpng called new_row that is to replace a corresponding row (of
- * the same data format) in a buffer allocated by your application.
- *
- * The new row data pointer new_row may be NULL, indicating there is
- * no new data to be replaced (in cases of interlace loading).
- *
- * If new_row is not NULL then you need to call
- * png_progressive_combine_row() to replace the corresponding row as
- * shown below:
- */
+   /*
+    * This function is called for every row in the image.  If the
+    * image is interlaced, and you turned on the interlace handler,
+    * this function will be called for every row in every pass.
+    *
+    * In this function you will receive a pointer to new row data from
+    * libpng called new_row that is to replace a corresponding row (of
+    * the same data format) in a buffer allocated by your application.
+    *
+    * The new row data pointer "new_row" may be NULL, indicating there is
+    * no new data to be replaced (in cases of interlace loading).
+    *
+    * If new_row is not NULL then you need to call
+    * png_progressive_combine_row() to replace the corresponding row as
+    * shown below:
+    */
+
   /* Check if row_num is in bounds. */
-   if((row_num >= 0) && (row_num < height))
+   if ((row_num >= 0) && (row_num < height))
   {
     /* Get pointer to corresponding row in our
      * PNG read buffer.
@@ -515,47 +520,47 @@ row_callback(png_structp png_ptr, png_bytep new_row,
     /* If both rows are allocated then copy the new row
      * data to the corresponding row data.
      */
-     if((old_row != NULL) && (new_row != NULL))
+     if ((old_row != NULL) && (new_row != NULL))
     png_progressive_combine_row(png_ptr, old_row, new_row);
   }
-/*
- * The rows and passes are called in order, so you don't really
- * need the row_num and pass, but I'm supplying them because it
- * may make your life easier.
- *
- * For the non-NULL rows of interlaced images, you must call
- * png_progressive_combine_row() passing in the new row and the
- * old row, as demonstrated above.  You can call this function for
- * NULL rows (it will just return) and for non-interlaced images
- * (it just does the png_memcpy for you) if it will make the code
- * easier.  Thus, you can just do this for all cases:
- */
+   /*
+    * The rows and passes are called in order, so you don't really
+    * need the row_num and pass, but I'm supplying them because it
+    * may make your life easier.
+    *
+    * For the non-NULL rows of interlaced images, you must call
+    * png_progressive_combine_row() passing in the new row and the
+    * old row, as demonstrated above.  You can call this function for
+    * NULL rows (it will just return) and for non-interlaced images
+    * (it just does the png_memcpy for you) if it will make the code
+    * easier.  Thus, you can just do this for all cases:
+    */

   png_progressive_combine_row(png_ptr, old_row, new_row);

-/* where old_row is what was displayed for previous rows.  Note
- * that the first pass (pass == 0 really) will completely cover
- * the old row, so the rows do not have to be initialized.  After
- * the first pass (and only for interlaced images), you will have
- * to pass the current row as new_row, and the function will combine
- * the old row and the new row.
- */
+   /* where old_row is what was displayed for previous rows.  Note
+    * that the first pass (pass == 0 really) will completely cover
+    * the old row, so the rows do not have to be initialized.  After
+    * the first pass (and only for interlaced images), you will have
+    * to pass the current row as new_row, and the function will combine
+    * the old row and the new row.
+    */
 }

 end_callback(png_structp png_ptr, png_infop info)
 {
-/* this function is called when the whole image has been read,
- * including any chunks after the image (up to and including
- * the IEND).  You will usually have the same info chunk as you
- * had in the header, although some data may have been added
- * to the comments and time fields.
- *
- * Most people won't do much here, perhaps setting a flag that
- * marks the image as finished.
- */
+   /* This function is called when the whole image has been read,
+    * including any chunks after the image (up to and including
+    * the IEND).  You will usually have the same info chunk as you
+    * had in the header, although some data may have been added
+    * to the comments and time fields.
+    *
+    * Most people won't do much here, perhaps setting a flag that
+    * marks the image as finished.
+    */
 }

-/* write a png file */
+/* Write a png file */
 void write_png(char *file_name /* , ... other image information ... */)
 {
   FILE *fp;
@@ -563,7 +568,7 @@ void write_png(char *file_name /* , ... other image information ... */)
   png_infop info_ptr;
   png_colorp palette;

-   /* open the file */
+   /* Open the file */
   fp = fopen(file_name, "wb");
   if (fp == NULL)
      return (ERROR);
@@ -597,30 +602,34 @@ void write_png(char *file_name /* , ... other image information ... */)
    */
   if (setjmp(png_jmpbuf(png_ptr)))
   {
-      /* If we get here, we had a problem reading the file */
+      /* If we get here, we had a problem writing the file */
      fclose(fp);
      png_destroy_write_struct(&png_ptr, &info_ptr);
      return (ERROR);
   }

   /* One of the following I/O initialization functions is REQUIRED */
+
 #ifdef streams /* I/O initialization method 1 */
-   /* set up the output control if you are using standard C streams */
+   /* Set up the output control if you are using standard C streams */
   png_init_io(png_ptr, fp);
+
 #else no_streams /* I/O initialization method 2 */
-   /* If you are using replacement read functions, instead of calling
-    * png_init_io() here you would call */
+   /* If you are using replacement write functions, instead of calling
+    * png_init_io() here you would call
+    */
   png_set_write_fn(png_ptr, (void *)user_io_ptr, user_write_fn,
      user_IO_flush_function);
   /* where user_io_ptr is a structure you want available to the callbacks */
-#endif no_streams /* only use one initialization method */
+#endif no_streams /* Only use one initialization method */

 #ifdef hilevel
   /* This is the easy way.  Use it if you already have all the
-    * image info living info in the structure.  You could "|" many
+    * image info living in the structure.  You could "|" many
    * PNG_TRANSFORM flags into the png_transforms integer here.
    */
   png_write_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
+
 #else
   /* This is the hard way */

@@ -635,25 +644,27 @@ void write_png(char *file_name /* , ... other image information ... */)
   png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, PNG_COLOR_TYPE_???,
      PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);

-   /* set the palette if there is one.  REQUIRED for indexed-color images */
+   /* Set the palette if there is one.  REQUIRED for indexed-color images */
   palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
-             * png_sizeof (png_color));
-   /* ... set palette colors ... */
+             * png_sizeof(png_color));
+   /* ... Set palette colors ... */
   png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
   /* You must not free palette here, because png_set_PLTE only makes a link to
-      the palette that you malloced.  Wait until you are about to destroy
-      the png structure. */
+    * the palette that you malloced.  Wait until you are about to destroy
+    * the png structure.
+    */

-   /* optional significant bit chunk */
-   /* if we are dealing with a grayscale image then */
+   /* Optional significant bit (sBIT) chunk */
+   png_color_8 sig_bit;
+   /* If we are dealing with a grayscale image then */
   sig_bit.gray = true_bit_depth;
-   /* otherwise, if we are dealing with a color image then */
+   /* Otherwise, if we are dealing with a color image then */
   sig_bit.red = true_red_bit_depth;
   sig_bit.green = true_green_bit_depth;
   sig_bit.blue = true_blue_bit_depth;
-   /* if the image has an alpha channel then */
+   /* If the image has an alpha channel then */
   sig_bit.alpha = true_alpha_bit_depth;
-   png_set_sBIT(png_ptr, info_ptr, sig_bit);
+   png_set_sBIT(png_ptr, info_ptr, &sig_bit);


   /* Optional gamma chunk is strongly suggested if you have any guess
@@ -678,9 +689,12 @@ void write_png(char *file_name /* , ... other image information ... */)
 #endif
   png_set_text(png_ptr, info_ptr, text_ptr, 3);

-   /* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
-   /* note that if sRGB is present the gAMA and cHRM chunks must be ignored
-    * on read and must be written in accordance with the sRGB profile */
+   /* Other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs */
+
+   /* Note that if sRGB is present the gAMA and cHRM chunks must be ignored
+    * on read and, if your application chooses to write them, they must
+    * be written in accordance with the sRGB profile
+    */

   /* Write the file header information.  REQUIRED */
   png_write_info(png_ptr, info_ptr);
@@ -692,7 +706,7 @@ void write_png(char *file_name /* , ... other image information ... */)
    *   write_my_chunk();
    *   png_write_info(png_ptr, info_ptr);
    *
-    * However, given the level of known- and unknown-chunk support in 1.1.0
+    * However, given the level of known- and unknown-chunk support in 1.2.0
    * and up, this should no longer be necessary.
    */

@@ -702,11 +716,11 @@ void write_png(char *file_name /* , ... other image information ... */)
    * at the end.
    */

-   /* set up the transformations you want.  Note that these are
+   /* Set up the transformations you want.  Note that these are
    * all optional.  Only call them if you want them.
    */

-   /* invert monochrome pixels */
+   /* Invert monochrome pixels */
   png_set_invert_mono(png_ptr);

   /* Shift the pixels up to a legal bit depth and fill in
@@ -714,10 +728,10 @@ void write_png(char *file_name /* , ... other image information ... */)
    */
   png_set_shift(png_ptr, &sig_bit);

-   /* pack pixels into bytes */
+   /* Pack pixels into bytes */
   png_set_packing(png_ptr);

-   /* swap location of alpha bytes from ARGB to RGBA */
+   /* Swap location of alpha bytes from ARGB to RGBA */
   png_set_swap_alpha(png_ptr);

   /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
@@ -725,16 +739,16 @@ void write_png(char *file_name /* , ... other image information ... */)
    */
   png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);

-   /* flip BGR pixels to RGB */
+   /* Flip BGR pixels to RGB */
   png_set_bgr(png_ptr);

-   /* swap bytes of 16-bit files to most significant byte first */
+   /* Swap bytes of 16-bit files to most significant byte first */
   png_set_swap(png_ptr);

-   /* swap bits of 1, 2, 4 bit packed pixel formats */
+   /* Swap bits of 1, 2, 4 bit packed pixel formats */
   png_set_packswap(png_ptr);

-   /* turn on interlace handling if you are not using png_write_image() */
+   /* Turn on interlace handling if you are not using png_write_image() */
   if (interlacing)
      number_passes = png_set_interlace_handling(png_ptr);
   else
@@ -755,12 +769,14 @@ void write_png(char *file_name /* , ... other image information ... */)
     row_pointers[k] = image + k*width*bytes_per_pixel;

   /* One of the following output methods is REQUIRED */
-#ifdef entire /* write out the entire image data in one call */
+
+#ifdef entire /* Write out the entire image data in one call */
   png_write_image(png_ptr, row_pointers);

-   /* the other way to write the image - deal with interlacing */
+   /* The other way to write the image - deal with interlacing */
+
+#else no_entire /* Write out the image data by one or more scanlines */

-#else no_entire /* write out the image data by one or more scanlines */
   /* The number of passes is either 1 for non-interlaced images,
    * or 7 for interlaced images.
    */
@@ -771,14 +787,12 @@ void write_png(char *file_name /* , ... other image information ... */)

      /* If you are only writing one row at a time, this works */
      for (y = 0; y < height; y++)
-      {
         png_write_rows(png_ptr, &row_pointers[y], 1);
-      }
   }
-#endif no_entire /* use only one output method */
+#endif no_entire /* Use only one output method */

   /* You can write optional chunks like tEXt, zTXt, and tIME at the end
-    * as well.  Shouldn't be necessary in 1.1.0 and up as all the public
+    * as well.  Shouldn't be necessary in 1.2.0 and up as all the public
    * chunks are supported and you can use png_set_unknown_chunks() to
    * register unknown chunks into the info structure to be written out.
    */
@@ -788,26 +802,33 @@ void write_png(char *file_name /* , ... other image information ... */)
 #endif hilevel

   /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
-      as recommended in versions 1.0.5m and earlier of this example; if
-      libpng mallocs info_ptr->palette, libpng will free it).  If you
-      allocated it with malloc() instead of png_malloc(), use free() instead
-      of png_free(). */
+    * as recommended in versions 1.0.5m and earlier of this example; if
+    * libpng mallocs info_ptr->palette, libpng will free it).  If you
+    * allocated it with malloc() instead of png_malloc(), use free() instead
+    * of png_free().
+    */
   png_free(png_ptr, palette);
-   palette=NULL;
+   palette = NULL;

   /* Similarly, if you png_malloced any data that you passed in with
-      png_set_something(), such as a hist or trans array, free it here,
-      when you can be sure that libpng is through with it. */
+    * png_set_something(), such as a hist or trans array, free it here,
+    * when you can be sure that libpng is through with it.
+    */
   png_free(png_ptr, trans);
-   trans=NULL;
+   trans = NULL;
+   /* Whenever you use png_free() it is a good idea to set the pointer to
+    * NULL in case your application inadvertently tries to png_free() it
+    * again.  When png_free() sees a NULL it returns without action, thus
+    * avoiding the double-free security problem.
+    */

-   /* clean up after the write, and free any memory allocated */
+   /* Clean up after the write, and free any memory allocated */
   png_destroy_write_struct(&png_ptr, &info_ptr);

-   /* close the file */
+   /* Close the file */
   fclose(fp);

-   /* that's it */
+   /* That's it */
   return (OK);
 }

--- a/669
+++ b/669
@@ -1,251 +1,520 @@
 #!/bin/sh
-#
 # install - install a program, script, or datafile
-# This comes from X11R5 (mit/util/scripts/install.sh).
+
+scriptversion=2009-04-28.21; # UTC
+
+# This originates from X11R5 (mit/util/scripts/install.sh), which was
+# later released in X11R6 (xc/config/util/install.sh) with the
+# following copyright and license.
 #
-# Copyright 1991 by the Massachusetts Institute of Technology
+# Copyright (C) 1994 X Consortium
 #
-# Permission to use, copy, modify, distribute, and sell this software and its
-# documentation for any purpose is hereby granted without fee, provided that
-# the above copyright notice appear in all copies and that both that
-# copyright notice and this permission notice appear in supporting
-# documentation, and that the name of M.I.T. not be used in advertising or
-# publicity pertaining to distribution of the software without specific,
-# written prior permission.  M.I.T. makes no representations about the
-# suitability of this software for any purpose.  It is provided "as is"
-# without express or implied warranty.
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+# X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+# AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC-
+# TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+# Except as contained in this notice, the name of the X Consortium shall not
+# be used in advertising or otherwise to promote the sale, use or other deal-
+# ings in this Software without prior written authorization from the X Consor-
+# tium.
+#
+#
+# FSF changes to this file are in the public domain.
 #
 # Calling this script install-sh is preferred over install.sh, to prevent
 # `make' implicit rules from creating a file called install from it
 # when there is no Makefile.
 #
 # This script is compatible with the BSD install script, but was written
-# from scratch.  It can only install one file at a time, a restriction
-# shared with many OS's install programs.
+# from scratch.

+nl='
+'
+IFS=" ""	$nl"

 # set DOITPROG to echo to test this script

 # Don't use :- since 4.3BSD and earlier shells don't like it.
-doit="${DOITPROG-}"
-
-
-# put in absolute paths if you don't have them in your path; or use env. vars.
-
-mvprog="${MVPROG-mv}"
-cpprog="${CPPROG-cp}"
-chmodprog="${CHMODPROG-chmod}"
-chownprog="${CHOWNPROG-chown}"
-chgrpprog="${CHGRPPROG-chgrp}"
-stripprog="${STRIPPROG-strip}"
-rmprog="${RMPROG-rm}"
-mkdirprog="${MKDIRPROG-mkdir}"
-
-transformbasename=""
-transform_arg=""
-instcmd="$mvprog"
-chmodcmd="$chmodprog 0755"
-chowncmd=""
-chgrpcmd=""
-stripcmd=""
-rmcmd="$rmprog -f"
-mvcmd="$mvprog"
-src=""
-dst=""
-dir_arg=""
-
-while [ x"$1" != x ]; do
-    case $1 in
-	-c) instcmd="$cpprog"
-	    shift
-	    continue;;
-
-	-d) dir_arg=true
-	    shift
-	    continue;;
-
-	-m) chmodcmd="$chmodprog $2"
-	    shift
-	    shift
-	    continue;;
-
-	-o) chowncmd="$chownprog $2"
-	    shift
-	    shift
-	    continue;;
-
-	-g) chgrpcmd="$chgrpprog $2"
-	    shift
-	    shift
-	    continue;;
-
-	-s) stripcmd="$stripprog"
-	    shift
-	    continue;;
-
-	-t=*) transformarg=`echo $1 | sed 's/-t=//'`
-	    shift
-	    continue;;
-
-	-b=*) transformbasename=`echo $1 | sed 's/-b=//'`
-	    shift
-	    continue;;
-
-	*)  if [ x"$src" = x ]
-	    then
-		src=$1
-	    else
-		# this colon is to work around a 386BSD /bin/sh bug
-		:
-		dst=$1
-	    fi
-	    shift
-	    continue;;
-    esac
-done
-
-if [ x"$src" = x ]
-then
-	echo "install:	no input file specified"
-	exit 1
+doit=${DOITPROG-}
+if test -z "$doit"; then
+  doit_exec=exec
 else
-	true
+  doit_exec=$doit
 fi

-if [ x"$dir_arg" != x ]; then
-	dst=$src
-	src=""
-	
-	if [ -d $dst ]; then
-		instcmd=:
-		chmodcmd=""
-	else
-		instcmd=mkdir
-	fi
-else
+# Put in absolute file names if you don't have them in your path;
+# or use environment vars.

-# Waiting for this to be detected by the "$instcmd $src $dsttmp" command
-# might cause directories to be created, which would be especially bad 
-# if $src (and thus $dsttmp) contains '*'.
+chgrpprog=${CHGRPPROG-chgrp}
+chmodprog=${CHMODPROG-chmod}
+chownprog=${CHOWNPROG-chown}
+cmpprog=${CMPPROG-cmp}
+cpprog=${CPPROG-cp}
+mkdirprog=${MKDIRPROG-mkdir}
+mvprog=${MVPROG-mv}
+rmprog=${RMPROG-rm}
+stripprog=${STRIPPROG-strip}

-	if [ -f $src -o -d $src ]
-	then
-		true
-	else
-		echo "install:  $src does not exist"
-		exit 1
-	fi
-	
-	if [ x"$dst" = x ]
-	then
-		echo "install:	no destination specified"
-		exit 1
-	else
-		true
-	fi
-
-# If destination is a directory, append the input filename; if your system
-# does not like double slashes in filenames, you may need to add some logic
-
-	if [ -d $dst ]
-	then
-		dst="$dst"/`basename $src`
-	else
-		true
-	fi
-fi
-
-## this sed command emulates the dirname command
-dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
-
-# Make sure that the destination directory exists.
-#  this part is taken from Noah Friedman's mkinstalldirs script
-
-# Skip lots of stat calls in the usual case.
-if [ ! -d "$dstdir" ]; then
-defaultIFS='	
+posix_glob='?'
+initialize_posix_glob='
+  test "$posix_glob" != "?" || {
+    if (set -f) 2>/dev/null; then
+      posix_glob=
+    else
+      posix_glob=:
+    fi
+  }
 '
-IFS="${IFS-${defaultIFS}}"

-oIFS="${IFS}"
-# Some sh's can't handle IFS=/ for some reason.
-IFS='%'
-set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
-IFS="${oIFS}"
+posix_mkdir=

-pathcomp=''
+# Desired mode of installed file.
+mode=0755

-while [ $# -ne 0 ] ; do
-	pathcomp="${pathcomp}${1}"
-	shift
+chgrpcmd=
+chmodcmd=$chmodprog
+chowncmd=
+mvcmd=$mvprog
+rmcmd="$rmprog -f"
+stripcmd=

-	if [ ! -d "${pathcomp}" ] ;
-        then
-		$mkdirprog "${pathcomp}"
-	else
-		true
-	fi
+src=
+dst=
+dir_arg=
+dst_arg=

-	pathcomp="${pathcomp}/"
+copy_on_change=false
+no_target_directory=
+
+usage="\
+Usage: $0 [OPTION]... [-T] SRCFILE DSTFILE
+   or: $0 [OPTION]... SRCFILES... DIRECTORY
+   or: $0 [OPTION]... -t DIRECTORY SRCFILES...
+   or: $0 [OPTION]... -d DIRECTORIES...
+
+In the 1st form, copy SRCFILE to DSTFILE.
+In the 2nd and 3rd, copy all SRCFILES to DIRECTORY.
+In the 4th, create DIRECTORIES.
+
+Options:
+     --help     display this help and exit.
+     --version  display version info and exit.
+
+  -c            (ignored)
+  -C            install only if different (preserve the last data modification time)
+  -d            create directories instead of installing files.
+  -g GROUP      $chgrpprog installed files to GROUP.
+  -m MODE       $chmodprog installed files to MODE.
+  -o USER       $chownprog installed files to USER.
+  -s            $stripprog installed files.
+  -t DIRECTORY  install into DIRECTORY.
+  -T            report an error if DSTFILE is a directory.
+
+Environment variables override the default commands:
+  CHGRPPROG CHMODPROG CHOWNPROG CMPPROG CPPROG MKDIRPROG MVPROG
+  RMPROG STRIPPROG
+"
+
+while test $# -ne 0; do
+  case $1 in
+    -c) ;;
+
+    -C) copy_on_change=true;;
+
+    -d) dir_arg=true;;
+
+    -g) chgrpcmd="$chgrpprog $2"
+	shift;;
+
+    --help) echo "$usage"; exit $?;;
+
+    -m) mode=$2
+	case $mode in
+	  *' '* | *'	'* | *'
+'*	  | *'*'* | *'?'* | *'['*)
+	    echo "$0: invalid mode: $mode" >&2
+	    exit 1;;
+	esac
+	shift;;
+
+    -o) chowncmd="$chownprog $2"
+	shift;;
+
+    -s) stripcmd=$stripprog;;
+
+    -t) dst_arg=$2
+	shift;;
+
+    -T) no_target_directory=true;;
+
+    --version) echo "$0 $scriptversion"; exit $?;;
+
+    --)	shift
+	break;;
+
+    -*)	echo "$0: invalid option: $1" >&2
+	exit 1;;
+
+    *)  break;;
+  esac
+  shift
 done
+
+if test $# -ne 0 && test -z "$dir_arg$dst_arg"; then
+  # When -d is used, all remaining arguments are directories to create.
+  # When -t is used, the destination is already specified.
+  # Otherwise, the last argument is the destination.  Remove it from $@.
+  for arg
+  do
+    if test -n "$dst_arg"; then
+      # $@ is not empty: it contains at least $arg.
+      set fnord "$@" "$dst_arg"
+      shift # fnord
+    fi
+    shift # arg
+    dst_arg=$arg
+  done
 fi

-if [ x"$dir_arg" != x ]
-then
-	$doit $instcmd $dst &&
+if test $# -eq 0; then
+  if test -z "$dir_arg"; then
+    echo "$0: no input file specified." >&2
+    exit 1
+  fi
+  # It's OK to call `install-sh -d' without argument.
+  # This can happen when creating conditional directories.
+  exit 0
+fi

-	if [ x"$chowncmd" != x ]; then $doit $chowncmd $dst; else true ; fi &&
-	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dst; else true ; fi &&
-	if [ x"$stripcmd" != x ]; then $doit $stripcmd $dst; else true ; fi &&
-	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dst; else true ; fi
-else
+if test -z "$dir_arg"; then
+  trap '(exit $?); exit' 1 2 13 15

-# If we're going to rename the final executable, determine the name now.
+  # Set umask so as not to create temps with too-generous modes.
+  # However, 'strip' requires both read and write access to temps.
+  case $mode in
+    # Optimize common cases.
+    *644) cp_umask=133;;
+    *755) cp_umask=22;;

-	if [ x"$transformarg" = x ] 
-	then
-		dstfile=`basename $dst`
+    *[0-7])
+      if test -z "$stripcmd"; then
+	u_plus_rw=
+      else
+	u_plus_rw='% 200'
+      fi
+      cp_umask=`expr '(' 777 - $mode % 1000 ')' $u_plus_rw`;;
+    *)
+      if test -z "$stripcmd"; then
+	u_plus_rw=
+      else
+	u_plus_rw=,u+rw
+      fi
+      cp_umask=$mode$u_plus_rw;;
+  esac
+fi
+
+for src
+do
+  # Protect names starting with `-'.
+  case $src in
+    -*) src=./$src;;
+  esac
+
+  if test -n "$dir_arg"; then
+    dst=$src
+    dstdir=$dst
+    test -d "$dstdir"
+    dstdir_status=$?
+  else
+
+    # Waiting for this to be detected by the "$cpprog $src $dsttmp" command
+    # might cause directories to be created, which would be especially bad
+    # if $src (and thus $dsttmp) contains '*'.
+    if test ! -f "$src" && test ! -d "$src"; then
+      echo "$0: $src does not exist." >&2
+      exit 1
+    fi
+
+    if test -z "$dst_arg"; then
+      echo "$0: no destination specified." >&2
+      exit 1
+    fi
+
+    dst=$dst_arg
+    # Protect names starting with `-'.
+    case $dst in
+      -*) dst=./$dst;;
+    esac
+
+    # If destination is a directory, append the input filename; won't work
+    # if double slashes aren't ignored.
+    if test -d "$dst"; then
+      if test -n "$no_target_directory"; then
+	echo "$0: $dst_arg: Is a directory" >&2
+	exit 1
+      fi
+      dstdir=$dst
+      dst=$dstdir/`basename "$src"`
+      dstdir_status=0
+    else
+      # Prefer dirname, but fall back on a substitute if dirname fails.
+      dstdir=`
+	(dirname "$dst") 2>/dev/null ||
+	expr X"$dst" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	     X"$dst" : 'X\(//\)[^/]' \| \
+	     X"$dst" : 'X\(//\)$' \| \
+	     X"$dst" : 'X\(/\)' \| . 2>/dev/null ||
+	echo X"$dst" |
+	    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\/\)[^/].*/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\/\)$/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\).*/{
+		   s//\1/
+		   q
+		 }
+		 s/.*/./; q'
+      `
+
+      test -d "$dstdir"
+      dstdir_status=$?
+    fi
+  fi
+
+  obsolete_mkdir_used=false
+
+  if test $dstdir_status != 0; then
+    case $posix_mkdir in
+      '')
+	# Create intermediate dirs using mode 755 as modified by the umask.
+	# This is like FreeBSD 'install' as of 1997-10-28.
+	umask=`umask`
+	case $stripcmd.$umask in
+	  # Optimize common cases.
+	  *[2367][2367]) mkdir_umask=$umask;;
+	  .*0[02][02] | .[02][02] | .[02]) mkdir_umask=22;;
+
+	  *[0-7])
+	    mkdir_umask=`expr $umask + 22 \
+	      - $umask % 100 % 40 + $umask % 20 \
+	      - $umask % 10 % 4 + $umask % 2
+	    `;;
+	  *) mkdir_umask=$umask,go-w;;
+	esac
+
+	# With -d, create the new directory with the user-specified mode.
+	# Otherwise, rely on $mkdir_umask.
+	if test -n "$dir_arg"; then
+	  mkdir_mode=-m$mode
 	else
-		dstfile=`basename $dst $transformbasename | 
-			sed $transformarg`$transformbasename
+	  mkdir_mode=
 	fi

-# don't allow the sed command to completely eliminate the filename
+	posix_mkdir=false
+	case $umask in
+	  *[123567][0-7][0-7])
+	    # POSIX mkdir -p sets u+wx bits regardless of umask, which
+	    # is incompatible with FreeBSD 'install' when (umask & 300) != 0.
+	    ;;
+	  *)
+	    tmpdir=${TMPDIR-/tmp}/ins$RANDOM-$$
+	    trap 'ret=$?; rmdir "$tmpdir/d" "$tmpdir" 2>/dev/null; exit $ret' 0

-	if [ x"$dstfile" = x ] 
-	then
-		dstfile=`basename $dst`
+	    if (umask $mkdir_umask &&
+		exec $mkdirprog $mkdir_mode -p -- "$tmpdir/d") >/dev/null 2>&1
+	    then
+	      if test -z "$dir_arg" || {
+		   # Check for POSIX incompatibilities with -m.
+		   # HP-UX 11.23 and IRIX 6.5 mkdir -m -p sets group- or
+		   # other-writeable bit of parent directory when it shouldn't.
+		   # FreeBSD 6.1 mkdir -m -p sets mode of existing directory.
+		   ls_ld_tmpdir=`ls -ld "$tmpdir"`
+		   case $ls_ld_tmpdir in
+		     d????-?r-*) different_mode=700;;
+		     d????-?--*) different_mode=755;;
+		     *) false;;
+		   esac &&
+		   $mkdirprog -m$different_mode -p -- "$tmpdir" && {
+		     ls_ld_tmpdir_1=`ls -ld "$tmpdir"`
+		     test "$ls_ld_tmpdir" = "$ls_ld_tmpdir_1"
+		   }
+		 }
+	      then posix_mkdir=:
+	      fi
+	      rmdir "$tmpdir/d" "$tmpdir"
+	    else
+	      # Remove any dirs left behind by ancient mkdir implementations.
+	      rmdir ./$mkdir_mode ./-p ./-- 2>/dev/null
+	    fi
+	    trap '' 0;;
+	esac;;
+    esac
+
+    if
+      $posix_mkdir && (
+	umask $mkdir_umask &&
+	$doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir"
+      )
+    then :
+    else
+
+      # The umask is ridiculous, or mkdir does not conform to POSIX,
+      # or it failed possibly due to a race condition.  Create the
+      # directory the slow way, step by step, checking for races as we go.
+
+      case $dstdir in
+	/*) prefix='/';;
+	-*) prefix='./';;
+	*)  prefix='';;
+      esac
+
+      eval "$initialize_posix_glob"
+
+      oIFS=$IFS
+      IFS=/
+      $posix_glob set -f
+      set fnord $dstdir
+      shift
+      $posix_glob set +f
+      IFS=$oIFS
+
+      prefixes=
+
+      for d
+      do
+	test -z "$d" && continue
+
+	prefix=$prefix$d
+	if test -d "$prefix"; then
+	  prefixes=
 	else
-		true
+	  if $posix_mkdir; then
+	    (umask=$mkdir_umask &&
+	     $doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir") && break
+	    # Don't fail if two instances are running concurrently.
+	    test -d "$prefix" || exit 1
+	  else
+	    case $prefix in
+	      *\'*) qprefix=`echo "$prefix" | sed "s/'/'\\\\\\\\''/g"`;;
+	      *) qprefix=$prefix;;
+	    esac
+	    prefixes="$prefixes '$qprefix'"
+	  fi
 	fi
+	prefix=$prefix/
+      done

-# Make a temp file name in the proper directory.
+      if test -n "$prefixes"; then
+	# Don't fail if two instances are running concurrently.
+	(umask $mkdir_umask &&
+	 eval "\$doit_exec \$mkdirprog $prefixes") ||
+	  test -d "$dstdir" || exit 1
+	obsolete_mkdir_used=true
+      fi
+    fi
+  fi

-	dsttmp=$dstdir/#inst.$$#
+  if test -n "$dir_arg"; then
+    { test -z "$chowncmd" || $doit $chowncmd "$dst"; } &&
+    { test -z "$chgrpcmd" || $doit $chgrpcmd "$dst"; } &&
+    { test "$obsolete_mkdir_used$chowncmd$chgrpcmd" = false ||
+      test -z "$chmodcmd" || $doit $chmodcmd $mode "$dst"; } || exit 1
+  else

-# Move or copy the file name to the temp name
+    # Make a couple of temp file names in the proper directory.
+    dsttmp=$dstdir/_inst.$$_
+    rmtmp=$dstdir/_rm.$$_

-	$doit $instcmd $src $dsttmp &&
+    # Trap to clean up those temp files at exit.
+    trap 'ret=$?; rm -f "$dsttmp" "$rmtmp" && exit $ret' 0

-	trap "rm -f ${dsttmp}" 0 &&
+    # Copy the file name to the temp name.
+    (umask $cp_umask && $doit_exec $cpprog "$src" "$dsttmp") &&

-# and set any options; do chmod last to preserve setuid bits
+    # and set any options; do chmod last to preserve setuid bits.
+    #
+    # If any of these fail, we abort the whole thing.  If we want to
+    # ignore errors from any of these, just make sure not to ignore
+    # errors from the above "$doit $cpprog $src $dsttmp" command.
+    #
+    { test -z "$chowncmd" || $doit $chowncmd "$dsttmp"; } &&
+    { test -z "$chgrpcmd" || $doit $chgrpcmd "$dsttmp"; } &&
+    { test -z "$stripcmd" || $doit $stripcmd "$dsttmp"; } &&
+    { test -z "$chmodcmd" || $doit $chmodcmd $mode "$dsttmp"; } &&

-# If any of these fail, we abort the whole thing.  If we want to
-# ignore errors from any of these, just make sure not to ignore
-# errors from the above "$doit $instcmd $src $dsttmp" command.
+    # If -C, don't bother to copy if it wouldn't change the file.
+    if $copy_on_change &&
+       old=`LC_ALL=C ls -dlL "$dst"	2>/dev/null` &&
+       new=`LC_ALL=C ls -dlL "$dsttmp"	2>/dev/null` &&

-	if [ x"$chowncmd" != x ]; then $doit $chowncmd $dsttmp; else true;fi &&
-	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dsttmp; else true;fi &&
-	if [ x"$stripcmd" != x ]; then $doit $stripcmd $dsttmp; else true;fi &&
-	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dsttmp; else true;fi &&
+       eval "$initialize_posix_glob" &&
+       $posix_glob set -f &&
+       set X $old && old=:$2:$4:$5:$6 &&
+       set X $new && new=:$2:$4:$5:$6 &&
+       $posix_glob set +f &&

-# Now rename the file to the real destination.
+       test "$old" = "$new" &&
+       $cmpprog "$dst" "$dsttmp" >/dev/null 2>&1
+    then
+      rm -f "$dsttmp"
+    else
+      # Rename the file to the real destination.
+      $doit $mvcmd -f "$dsttmp" "$dst" 2>/dev/null ||

-	$doit $rmcmd -f $dstdir/$dstfile &&
-	$doit $mvcmd $dsttmp $dstdir/$dstfile 
+      # The rename failed, perhaps because mv can't rename something else
+      # to itself, or perhaps because mv is so ancient that it does not
+      # support -f.
+      {
+	# Now remove or move aside any old file at destination location.
+	# We try this two ways since rm can't unlink itself on some
+	# systems and the destination file might be busy for other
+	# reasons.  In this case, the final cleanup might fail but the new
+	# file should still install successfully.
+	{
+	  test ! -f "$dst" ||
+	  $doit $rmcmd -f "$dst" 2>/dev/null ||
+	  { $doit $mvcmd -f "$dst" "$rmtmp" 2>/dev/null &&
+	    { $doit $rmcmd -f "$rmtmp" 2>/dev/null; :; }
+	  } ||
+	  { echo "$0: cannot unlink or rename $dst" >&2
+	    (exit 1); exit 1
+	  }
+	} &&

-fi &&
+	# Now rename the file to the real destination.
+	$doit $mvcmd "$dsttmp" "$dst"
+      }
+    fi || exit 1

+    trap '' 0
+  fi
+done

-exit 0
+# Local variables:
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:
--- a/libpng-1.2.41beta02.txt
+++ b/libpng-1.2.41beta02.txt
@@ -1,13 +1,19 @@
 libpng.txt - A description on how to use and modify libpng

- libpng version 1.2.23 - November 6, 2007
+ libpng version 1.2.41beta02 - September 30, 2009
 Updated and distributed by Glenn Randers-Pehrson
 <glennrp at users.sourceforge.net>
- Copyright (c) 1998-2007 Glenn Randers-Pehrson
- For conditions of distribution and use, see copyright
- notice in png.h.
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson

- based on:
+ This document is released under the libpng license.
+ For conditions of distribution and use, see the disclaimer
+ and license in png.h
+
+ Based on:
+
+ libpng versions 0.97, January 1998, through 1.2.41beta02 - September 30, 2009
+ Updated and distributed by Glenn Randers-Pehrson
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson

 libpng 1.0 beta 6  version 0.96 May 28, 1997
 Updated and distributed by Andreas Dilger
@@ -47,12 +53,14 @@ a W3C Recommendation and as an ISO Standard (ISO/IEC 15948:2003 (E)) at
 The W3C and ISO documents have identical technical content.

 The PNG-1.2 specification is available at
-<http://www.libpng.org/pub/png/documents/>
+<http://www.libpng.org/pub/png/documents/>.  It is technically equivalent
+to the PNG specification (second edition) but has some additional material.

 The PNG-1.0 specification is available
 as RFC 2083 <http://www.libpng.org/pub/png/documents/> and as a
-W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
-additional chunks are described in the special-purpose public chunks
+W3C Recommendation <http://www.w3.org/TR/REC.png.html>.
+
+Some additional chunks are described in the special-purpose public chunks
 documents at <http://www.libpng.org/pub/png/documents/>.

 Other information
@@ -135,9 +143,10 @@ so if it doesn't work, you don't have much to undo.  Of course, you
 will also want to insure that you are, in fact, dealing with a PNG
 file.  Libpng provides a simple check to see if a file is a PNG file.
 To use it, pass in the first 1 to 8 bytes of the file to the function
-png_sig_cmp(), and it will return 0 if the bytes match the corresponding
-bytes of the PNG signature, or nonzero otherwise.  Of course, the more bytes
-you pass in, the greater the accuracy of the prediction.
+png_sig_cmp(), and it will return 0 (false) if the bytes match the
+corresponding bytes of the PNG signature, or nonzero (true) otherwise.
+Of course, the more bytes you pass in, the greater the accuracy of the
+prediction.

 If you are intending to keep the file pointer open for use in libpng,
 you must ensure you don't read more than 8 bytes from the beginning
@@ -260,15 +269,19 @@ input stream. You must supply the function
         png_unknown_chunkp chunk);
    {
       /* The unknown chunk structure contains your
-          chunk data: */
+          chunk data, along with similar data for any other
+          unknown chunks: */
+
           png_byte name[5];
           png_byte *data;
           png_size_t size;
+
       /* Note that libpng has already taken care of
          the CRC handling */

-       /* put your code here.  Return one of the
-          following: */
+       /* put your code here.  Search for your chunk in the
+          unknown chunk structure, process it, and return one
+          of the following: */

       return (-n); /* chunk had an error */
       return (0); /* did not recognize */
@@ -288,6 +301,11 @@ you can retrieve with

    png_get_user_chunk_ptr(png_ptr);

+If you call the png_set_read_user_chunk_fn() function, then all unknown
+chunks will be saved when read, in case your callback function will need
+one or more of them.  This behavior can be changed with the
+png_set_keep_unknown_chunks() function, described below.
+
 At this point, you can set up a callback function that will be
 called after each row has been read, which you can use to control
 a progress meter or the like.  It's demonstrated in pngtest.c.
@@ -305,40 +323,19 @@ To inform libpng about your function, use

    png_set_read_status_fn(png_ptr, read_row_callback);

-Width and height limits
-
-The PNG specification allows the width and height of an image to be as
-large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns.
-Since very few applications really need to process such large images,
-we have imposed an arbitrary 1-million limit on rows and columns.
-Larger images will be rejected immediately with a png_error() call. If
-you wish to override this limit, you can use
-
-   png_set_user_limits(png_ptr, width_max, height_max);
-
-to set your own limits, or use width_max = height_max = 0x7fffffffL
-to allow all valid dimensions (libpng may reject some very large images
-anyway because of potential buffer overflow conditions).
-
-You should put this statement after you create the PNG structure and
-before calling png_read_info(), png_read_png(), or png_process_data().
-If you need to retrieve the limits that are being applied, use
-
-   width_max = png_get_user_width_max(png_ptr);
-   height_max = png_get_user_height_max(png_ptr);
-
 Unknown-chunk handling

 Now you get to set the way the library processes unknown chunks in the
 input PNG stream. Both known and unknown chunks will be read.  Normal
 behavior is that known chunks will be parsed into information in
-various info_ptr members; unknown chunks will be discarded. To change
-this, you can call:
+various info_ptr members while unknown chunks will be discarded. This
+behavior can be wasteful if your application will never use some known
+chunk types. To change this, you can call:

    png_set_keep_unknown_chunks(png_ptr, keep,
        chunk_list, num_chunks);
-    keep       - 0: do not handle as unknown
-                 1: do not keep
+    keep       - 0: default unknown chunk handling
+                 1: ignore; do not keep
                 2: keep only if safe-to-copy
                 3: keep even if unsafe-to-copy
               You can use these definitions:
@@ -361,6 +358,58 @@ instances of png_set_keep_unknown_chunks(), the final instance will
 take precedence.  The IHDR and IEND chunks should not be named in
 chunk_list; if they are, libpng will process them normally anyway.

+Here is an example of the usage of png_set_keep_unknown_chunks(),
+where the private "vpAg" chunk will later be processed by a user chunk
+callback function:
+
+    png_byte vpAg[5]={118, 112,  65, 103, (png_byte) '\0'};
+
+    #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+      png_byte unused_chunks[]=
+      {
+        104,  73,  83,  84, (png_byte) '\0',   /* hIST */
+        105,  84,  88, 116, (png_byte) '\0',   /* iTXt */
+        112,  67,  65,  76, (png_byte) '\0',   /* pCAL */
+        115,  67,  65,  76, (png_byte) '\0',   /* sCAL */
+        115,  80,  76,  84, (png_byte) '\0',   /* sPLT */
+        116,  73,  77,  69, (png_byte) '\0',   /* tIME */
+      };
+    #endif
+
+    ...
+
+    #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+      /* ignore all unknown chunks: */
+      png_set_keep_unknown_chunks(read_ptr, 1, NULL, 0);
+      /* except for vpAg: */
+      png_set_keep_unknown_chunks(read_ptr, 2, vpAg, 1);
+      /* also ignore unused known chunks: */
+      png_set_keep_unknown_chunks(read_ptr, 1, unused_chunks,
+         (int)sizeof(unused_chunks)/5);
+    #endif
+
+User limits
+
+The PNG specification allows the width and height of an image to be as
+large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns.
+Since very few applications really need to process such large images,
+we have imposed an arbitrary 1-million limit on rows and columns.
+Larger images will be rejected immediately with a png_error() call. If
+you wish to override this limit, you can use
+
+   png_set_user_limits(png_ptr, width_max, height_max);
+
+to set your own limits, or use width_max = height_max = 0x7fffffffL
+to allow all valid dimensions (libpng may reject some very large images
+anyway because of potential buffer overflow conditions).
+
+You should put this statement after you create the PNG structure and
+before calling png_read_info(), png_read_png(), or png_process_data().
+If you need to retrieve the limits that are being applied, use
+
+   width_max = png_get_user_width_max(png_ptr);
+   height_max = png_get_user_height_max(png_ptr);
+
 The high-level read interface

 At this point there are two ways to proceed; through the high-level
@@ -425,6 +474,8 @@ row_pointers prior to calling png_read_png() with
         "Image is too wide to process in memory");
   row_pointers = png_malloc(png_ptr,
      height*png_sizeof(png_bytep));
+   for (int i=0; i<height, i++)
+      row_pointers[i]=NULL;  /* security precaution */
   for (int i=0; i<height, i++)
      row_pointers[i]=png_malloc(png_ptr,
         width*pixel_size);
@@ -579,8 +630,8 @@ into the info_ptr is returned for any complex types.

    png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans,
                     &trans_values);
-    trans          - array of transparent entries for
-                     palette (PNG_INFO_tRNS)
+    trans          - array of transparent
+                     entries for palette (PNG_INFO_tRNS)
    trans_values   - graylevel or color sample values of
                     the single transparent color for
                     non-paletted images (PNG_INFO_tRNS)
@@ -801,8 +852,6 @@ things.

 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
-At the same time, png_set_gray_1_2_4_to_8() was deprecated, and it
-will be removed from a future version.

 PNG can have files with 16 bits per channel.  If you only can handle
 8 bits per channel, this will strip the pixels down to 8 bit.
@@ -1654,7 +1703,7 @@ types.
       PNG_FILTER_NONE  | PNG_FILTER_VALUE_NONE |
       PNG_FILTER_SUB   | PNG_FILTER_VALUE_SUB  |
       PNG_FILTER_UP    | PNG_FILTER_VALUE_UP   |
-       PNG_FILTER_AVE   | PNG_FILTER_VALUE_AVE  |
+       PNG_FILTER_AVG   | PNG_FILTER_VALUE_AVG  |
       PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
       PNG_ALL_FILTERS);

@@ -1743,6 +1792,15 @@ Some of the more important parts of the png_info are:
                     can also be
                     PNG_INTRAPIXEL_DIFFERENCING)

+If you call png_set_IHDR(), the call must appear before any of the
+other png_set_*() functions, because they might require access to some of
+the IHDR settings.  The remaining png_set_*() functions can be called
+in any order.
+
+If you wish, you can reset the compression_type, interlace_type, or
+filter_method later by calling png_set_IHDR() again; if you do this, the
+width, height, bit_depth, and color_type must be the same in each call.
+
    png_set_PLTE(png_ptr, info_ptr, palette,
       num_palette);
    palette        - the palette for the file
@@ -1802,10 +1860,11 @@ Some of the more important parts of the png_info are:

    png_set_tRNS(png_ptr, info_ptr, trans, num_trans,
       trans_values);
-    trans          - array of transparent entries for
-                     palette (PNG_INFO_tRNS)
-    trans_values   - graylevel or color sample values of
-                     the single transparent color for
+    trans          - array of transparent
+                     entries for palette (PNG_INFO_tRNS)
+    trans_values   - graylevel or color sample values
+                     (in order red, green, blue) of the
+                     single transparent color for
                     non-paletted images (PNG_INFO_tRNS)
    num_trans      - number of transparent entries
                     (PNG_INFO_tRNS)
@@ -2014,7 +2073,12 @@ transformations are permitted, enabled by the following masks.
    PNG_TRANSFORM_INVERT_ALPHA  Change alpha from opacity
                                to transparency
    PNG_TRANSFORM_SWAP_ENDIAN   Byte-swap 16-bit samples
-    PNG_TRANSFORM_STRIP_FILLER  Strip out filler bytes.
+    PNG_TRANSFORM_STRIP_FILLER        Strip out filler
+                                      bytes (deprecated).
+    PNG_TRANSFORM_STRIP_FILLER_BEFORE Strip out leading
+                                      filler bytes
+    PNG_TRANSFORM_STRIP_FILLER_AFTER  Strip out trailing
+                                      filler bytes

 If you have valid image data in the info structure (you can use
 png_set_rows() to put image data in the info structure), simply do this:
@@ -2391,6 +2455,9 @@ Your malloc_fn() must return NULL in case of failure.  The png_malloc()
 function will normally call png_error() if it receives a NULL from the
 system memory allocator or from your replacement malloc_fn().

+Your free_fn() will never be called with a NULL ptr, since libpng's
+png_free() checks for NULL before calling free_fn().
+
 Input/Output in libpng is done through png_read() and png_write(),
 which currently just call fread() and fwrite().  The FILE * is stored in
 png_struct and is initialized via png_init_io().  If you wish to change
@@ -2418,9 +2485,15 @@ The replacement I/O functions must have prototypes as follows:
        png_bytep data, png_size_t length);
    void user_flush_data(png_structp png_ptr);

+The user_read_data() function is responsible for detecting and
+handling end-of-data errors.
+
 Supplying NULL for the read, write, or flush functions sets them back
-to using the default C stream functions.  It is an error to read from
-a write stream, and vice versa.
+to using the default C stream functions, which expect the io_ptr to
+point to a standard *FILE structure.  It is probably a mistake
+to use NULL for one of write_data_fn and output_flush_fn but not both
+of them, unless you have built libpng with PNG_NO_WRITE_FLUSH defined.
+It is an error to read from a write stream, and vice versa.

 Error handling in libpng is done through png_error() and png_warning().
 Errors handled through png_error() are fatal, meaning that png_error()
@@ -2525,11 +2598,12 @@ you may also have to change the memory allocators (png_malloc, etc.).

 Configuring for compiler xxx:

-All includes for libpng are in pngconf.h.  If you need to add/change/delete
-an include, this is the place to do it.  The includes that are not
-needed outside libpng are protected by the PNG_INTERNAL definition,
-which is only defined for those routines inside libpng itself.  The
-files in libpng proper only include png.h, which includes pngconf.h.
+All includes for libpng are in pngconf.h.  If you need to add, change
+or delete an include, this is the place to do it.
+The includes that are not needed outside libpng are protected by the
+PNG_INTERNAL definition, which is only defined for those routines inside
+libpng itself.  The files in libpng proper only include png.h, which
+includes pngconf.h.

 Configuring zlib:

@@ -2598,7 +2672,7 @@ currently does not allocate the filter buffers until png_write_row()
 is called for the first time.)

    filters = PNG_FILTER_NONE | PNG_FILTER_SUB
-              PNG_FILTER_UP | PNG_FILTER_AVE |
+              PNG_FILTER_UP | PNG_FILTER_AVG |
              PNG_FILTER_PAETH | PNG_ALL_FILTERS;

    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
@@ -2720,7 +2794,7 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
 having level = 0 will be printed.  There aren't any such statements in
 this version of libpng, but if you insert some they will be printed.

-VII.  MNG support
+VI.  MNG support

 The MNG specification (available at http://www.libpng.org/pub/mng) allows
 certain extensions to PNG for PNG images that are embedded in MNG datastreams.
@@ -2745,7 +2819,7 @@ or any other MNG chunks; your application must provide its own support for
 them.  You may wish to consider using libmng (available at
 http://www.libmng.com) instead.

-VIII.  Changes to Libpng from version 0.88
+VII.  Changes to Libpng from version 0.88

 It should be noted that versions of libpng later than 0.96 are not
 distributed by the original libpng author, Guy Schalnat, nor by
@@ -2794,15 +2868,203 @@ application:

   png_uint_32 application_vn = PNG_LIBPNG_VER;

-IX. Y2K Compliance in libpng
+VIII.  Changes to Libpng from version 1.0.x to 1.2.x

-November 6, 2007
+Support for user memory management was enabled by default.  To
+accomplish this, the functions png_create_read_struct_2(),
+png_create_write_struct_2(), png_set_mem_fn(), png_get_mem_ptr(),
+png_malloc_default(), and png_free_default() were added.
+
+Support for certain MNG features was enabled.
+
+Support for numbered error messages was added.  However, we never got
+around to actually numbering the error messages.  The function
+png_set_strip_error_numbers() was added (Note: the prototype for this
+function was inadvertently removed from png.h in PNG_NO_ASSEMBLER_CODE
+builds of libpng-1.2.15.  It was restored in libpng-1.2.36).
+
+The png_malloc_warn() function was added at libpng-1.2.3.  This issues
+a png_warning and returns NULL instead of aborting when it fails to
+acquire the requested memory allocation.
+
+Support for setting user limits on image width and height was enabled
+by default.  The functions png_set_user_limits(), png_get_user_width_max(),
+and png_get_user_height_max() were added at libpng-1.2.6.
+
+The png_set_add_alpha() function was added at libpng-1.2.7.
+
+The function png_set_expand_gray_1_2_4_to_8() was added at libpng-1.2.9.
+Unlike png_set_gray_1_2_4_to_8(), the new function does not expand the
+tRNS chunk to alpha. The png_set_gray_1_2_4_to_8() function is
+deprecated.
+
+A number of macro definitions in support of runtime selection of
+assembler code features (especially Intel MMX code support) were
+added at libpng-1.2.0:
+
+    PNG_ASM_FLAG_MMX_SUPPORT_COMPILED
+    PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
+    PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
+    PNG_ASM_FLAG_MMX_READ_INTERLACE
+    PNG_ASM_FLAG_MMX_READ_FILTER_SUB
+    PNG_ASM_FLAG_MMX_READ_FILTER_UP
+    PNG_ASM_FLAG_MMX_READ_FILTER_AVG
+    PNG_ASM_FLAG_MMX_READ_FILTER_PAETH
+    PNG_ASM_FLAGS_INITIALIZED
+    PNG_MMX_READ_FLAGS
+    PNG_MMX_FLAGS
+    PNG_MMX_WRITE_FLAGS
+    PNG_MMX_FLAGS
+
+We added the following functions in support of runtime
+selection of assembler code features:
+
+    png_get_mmx_flagmask()
+    png_set_mmx_thresholds()
+    png_get_asm_flags()
+    png_get_mmx_bitdepth_threshold()
+    png_get_mmx_rowbytes_threshold()
+    png_set_asm_flags()
+
+We replaced all of these functions with simple stubs in libpng-1.2.20,
+when the Intel assembler code was removed due to a licensing issue.
+
+IX.  (Omitted)
+X. Detecting libpng
+
+The png_get_io_ptr() function has been present since libpng-0.88, has never
+changed, and is unaffected by conditional compilation macros.  It is the
+best choice for use in configure scripts for detecting the presence of any
+libpng version since 0.88.  In an autoconf "configure.in" you could use
+
+    AC_CHECK_LIB(png, png_get_io_ptr, ...
+
+XI. Source code repository
+
+Since about February 2009, version 1.2.34, libpng has been under "git" source
+control.  The git repository was built from old libpng-x.y.z.tar.gz files
+going back to version 0.70.  You can access the git repository (read only)
+at
+
+    git://libpng.git.sourceforge.net/gitroot/libpng
+
+or you can browse it via "gitweb" at
+
+    http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng
+
+Patches can be sent to glennrp at users.sourceforge.net or to
+png-mng-implement at lists.sourceforge.net or you can upload them to
+the libpng bug tracker at
+
+    http://libpng.sourceforge.net
+
+XII. Coding style
+
+Our coding style is similar to the "Allman" style, with curly
+braces on separate lines:
+
+    if (condition)
+    {
+       action;
+    }
+
+    else if (another condition)
+    {
+       another action;
+    }
+
+The braces can be omitted from simple one-line actions:
+
+    if (condition)
+       return (0);
+
+We use 3-space indentation, except for continued statements which
+are usually indented the same as the first line of the statement
+plus four more spaces.
+
+Comments appear with the leading "/*" at the same indentation as
+the statement that follows the comment:
+
+    /* Single-line comment */
+    statement;
+
+    /* Multiple-line
+     * comment
+     */
+    statement;
+
+Very short comments can be placed at the end of the statement
+to which they pertain:
+
+    statement;    /* comment */
+
+We don't use C++ style ("//") comments. We have, however,
+used them in the past in some now-abandoned MMX assembler
+code.
+
+Functions and their curly braces are not indented, and
+exported functions are marked with PNGAPI:
+
+ /* This is a public function that is visible to
+  * application programers. It does thus-and-so.
+  */
+ void PNGAPI
+ png_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for all exported functions appear in png.h,
+above the comment that says
+
+    /* Maintainer: Put new public prototypes here ... */
+
+We mark all non-exported functions with "/* PRIVATE */"":
+
+ void /* PRIVATE */
+ png_non_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for non-exported functions (except for those in
+pngtest) appear in
+the PNG_INTERNAL section of png.h
+above the comment that says
+
+  /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
+
+The names of all exported functions and variables begin
+with  "png_", and all publicly visible C preprocessor
+macros begin with "PNG_".
+
+We put a space after each comma and after each semicolon
+in "for" statments, and we put spaces before and after each
+C binary operator and after "for" or "while".  We don't
+put a space between a typecast and the expression being
+cast, nor do we put one between a function name and the
+left parenthesis that follows it:
+
+    for (i = 2; i > 0; --i)
+       y[i] = a(x) + (int)b;
+
+We prefer #ifdef and #ifndef to #if defined() and if !defined()
+when there is only one macro being tested.
+
+We do not use the TAB character for indentation in the C sources.
+
+Other rules can be inferred by inspecting the libpng
+source.
+
+XIII. Y2K Compliance in libpng
+
+September 30, 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 1.2.23 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.41beta02 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 that
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "November 6, 2007"
+.TH LIBPNG 3 "September 30, 2009"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.41beta02
 .SH SYNOPSIS
 \fI\fB

@@ -821,14 +821,20 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng

- libpng version 1.2.23 - November 6, 2007
+ libpng version 1.2.41beta02 - September 30, 2009
 Updated and distributed by Glenn Randers-Pehrson
 <glennrp at users.sourceforge.net>
- Copyright (c) 1998-2007 Glenn Randers-Pehrson
- For conditions of distribution and use, see copyright
- notice in png.h.
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson

- based on:
+ This document is released under the libpng license.
+ For conditions of distribution and use, see the disclaimer
+ and license in png.h
+
+ Based on:
+
+ libpng versions 0.97, January 1998, through 1.2.41beta02 - September 30, 2009
+ Updated and distributed by Glenn Randers-Pehrson
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson

 libpng 1.0 beta 6  version 0.96 May 28, 1997
 Updated and distributed by Andreas Dilger
@@ -868,12 +874,14 @@ a W3C Recommendation and as an ISO Standard (ISO/IEC 15948:2003 (E)) at
 The W3C and ISO documents have identical technical content.

 The PNG-1.2 specification is available at
-<http://www.libpng.org/pub/png/documents/>
+<http://www.libpng.org/pub/png/documents/>.  It is technically equivalent
+to the PNG specification (second edition) but has some additional material.

 The PNG-1.0 specification is available
 as RFC 2083 <http://www.libpng.org/pub/png/documents/> and as a
-W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
-additional chunks are described in the special-purpose public chunks
+W3C Recommendation <http://www.w3.org/TR/REC.png.html>.
+
+Some additional chunks are described in the special-purpose public chunks
 documents at <http://www.libpng.org/pub/png/documents/>.

 Other information
@@ -956,9 +964,10 @@ so if it doesn't work, you don't have much to undo.  Of course, you
 will also want to insure that you are, in fact, dealing with a PNG
 file.  Libpng provides a simple check to see if a file is a PNG file.
 To use it, pass in the first 1 to 8 bytes of the file to the function
-png_sig_cmp(), and it will return 0 if the bytes match the corresponding
-bytes of the PNG signature, or nonzero otherwise.  Of course, the more bytes
-you pass in, the greater the accuracy of the prediction.
+png_sig_cmp(), and it will return 0 (false) if the bytes match the
+corresponding bytes of the PNG signature, or nonzero (true) otherwise.
+Of course, the more bytes you pass in, the greater the accuracy of the
+prediction.

 If you are intending to keep the file pointer open for use in libpng,
 you must ensure you don't read more than 8 bytes from the beginning
@@ -1081,15 +1090,19 @@ input stream. You must supply the function
         png_unknown_chunkp chunk);
    {
       /* The unknown chunk structure contains your
-          chunk data: */
+          chunk data, along with similar data for any other
+          unknown chunks: */
+
           png_byte name[5];
           png_byte *data;
           png_size_t size;
+
       /* Note that libpng has already taken care of
          the CRC handling */

-       /* put your code here.  Return one of the
-          following: */
+       /* put your code here.  Search for your chunk in the
+          unknown chunk structure, process it, and return one
+          of the following: */

       return (-n); /* chunk had an error */
       return (0); /* did not recognize */
@@ -1109,6 +1122,11 @@ you can retrieve with

    png_get_user_chunk_ptr(png_ptr);

+If you call the png_set_read_user_chunk_fn() function, then all unknown
+chunks will be saved when read, in case your callback function will need
+one or more of them.  This behavior can be changed with the
+png_set_keep_unknown_chunks() function, described below.
+
 At this point, you can set up a callback function that will be
 called after each row has been read, which you can use to control
 a progress meter or the like.  It's demonstrated in pngtest.c.
@@ -1126,40 +1144,19 @@ To inform libpng about your function, use

    png_set_read_status_fn(png_ptr, read_row_callback);

-.SS Width and height limits
-
-The PNG specification allows the width and height of an image to be as
-large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns.
-Since very few applications really need to process such large images,
-we have imposed an arbitrary 1-million limit on rows and columns.
-Larger images will be rejected immediately with a png_error() call. If
-you wish to override this limit, you can use
-
-   png_set_user_limits(png_ptr, width_max, height_max);
-
-to set your own limits, or use width_max = height_max = 0x7fffffffL
-to allow all valid dimensions (libpng may reject some very large images
-anyway because of potential buffer overflow conditions).
-
-You should put this statement after you create the PNG structure and
-before calling png_read_info(), png_read_png(), or png_process_data().
-If you need to retrieve the limits that are being applied, use
-
-   width_max = png_get_user_width_max(png_ptr);
-   height_max = png_get_user_height_max(png_ptr);
-
 .SS Unknown-chunk handling

 Now you get to set the way the library processes unknown chunks in the
 input PNG stream. Both known and unknown chunks will be read.  Normal
 behavior is that known chunks will be parsed into information in
-various info_ptr members; unknown chunks will be discarded. To change
-this, you can call:
+various info_ptr members while unknown chunks will be discarded. This
+behavior can be wasteful if your application will never use some known
+chunk types. To change this, you can call:

    png_set_keep_unknown_chunks(png_ptr, keep,
        chunk_list, num_chunks);
-    keep       - 0: do not handle as unknown
-                 1: do not keep
+    keep       - 0: default unknown chunk handling
+                 1: ignore; do not keep
                 2: keep only if safe-to-copy
                 3: keep even if unsafe-to-copy
               You can use these definitions:
@@ -1182,6 +1179,58 @@ instances of png_set_keep_unknown_chunks(), the final instance will
 take precedence.  The IHDR and IEND chunks should not be named in
 chunk_list; if they are, libpng will process them normally anyway.

+Here is an example of the usage of png_set_keep_unknown_chunks(),
+where the private "vpAg" chunk will later be processed by a user chunk
+callback function:
+
+    png_byte vpAg[5]={118, 112,  65, 103, (png_byte) '\0'};
+
+    #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+      png_byte unused_chunks[]=
+      {
+        104,  73,  83,  84, (png_byte) '\0',   /* hIST */
+        105,  84,  88, 116, (png_byte) '\0',   /* iTXt */
+        112,  67,  65,  76, (png_byte) '\0',   /* pCAL */
+        115,  67,  65,  76, (png_byte) '\0',   /* sCAL */
+        115,  80,  76,  84, (png_byte) '\0',   /* sPLT */
+        116,  73,  77,  69, (png_byte) '\0',   /* tIME */
+      };
+    #endif
+
+    ...
+
+    #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+      /* ignore all unknown chunks: */
+      png_set_keep_unknown_chunks(read_ptr, 1, NULL, 0);
+      /* except for vpAg: */
+      png_set_keep_unknown_chunks(read_ptr, 2, vpAg, 1);
+      /* also ignore unused known chunks: */
+      png_set_keep_unknown_chunks(read_ptr, 1, unused_chunks,
+         (int)sizeof(unused_chunks)/5);
+    #endif
+
+.SS User limits
+
+The PNG specification allows the width and height of an image to be as
+large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns.
+Since very few applications really need to process such large images,
+we have imposed an arbitrary 1-million limit on rows and columns.
+Larger images will be rejected immediately with a png_error() call. If
+you wish to override this limit, you can use
+
+   png_set_user_limits(png_ptr, width_max, height_max);
+
+to set your own limits, or use width_max = height_max = 0x7fffffffL
+to allow all valid dimensions (libpng may reject some very large images
+anyway because of potential buffer overflow conditions).
+
+You should put this statement after you create the PNG structure and
+before calling png_read_info(), png_read_png(), or png_process_data().
+If you need to retrieve the limits that are being applied, use
+
+   width_max = png_get_user_width_max(png_ptr);
+   height_max = png_get_user_height_max(png_ptr);
+
 .SS The high-level read interface

 At this point there are two ways to proceed; through the high-level
@@ -1246,6 +1295,8 @@ row_pointers prior to calling png_read_png() with
         "Image is too wide to process in memory");
   row_pointers = png_malloc(png_ptr,
      height*png_sizeof(png_bytep));
+   for (int i=0; i<height, i++)
+      row_pointers[i]=NULL;  /* security precaution */
   for (int i=0; i<height, i++)
      row_pointers[i]=png_malloc(png_ptr,
         width*pixel_size);
@@ -1400,8 +1451,8 @@ into the info_ptr is returned for any complex types.

    png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans,
                     &trans_values);
-    trans          - array of transparent entries for
-                     palette (PNG_INFO_tRNS)
+    trans          - array of transparent
+                     entries for palette (PNG_INFO_tRNS)
    trans_values   - graylevel or color sample values of
                     the single transparent color for
                     non-paletted images (PNG_INFO_tRNS)
@@ -1622,8 +1673,6 @@ things.

 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
-At the same time, png_set_gray_1_2_4_to_8() was deprecated, and it
-will be removed from a future version.

 PNG can have files with 16 bits per channel.  If you only can handle
 8 bits per channel, this will strip the pixels down to 8 bit.
@@ -2475,7 +2524,7 @@ types.
       PNG_FILTER_NONE  | PNG_FILTER_VALUE_NONE |
       PNG_FILTER_SUB   | PNG_FILTER_VALUE_SUB  |
       PNG_FILTER_UP    | PNG_FILTER_VALUE_UP   |
-       PNG_FILTER_AVE   | PNG_FILTER_VALUE_AVE  |
+       PNG_FILTER_AVG   | PNG_FILTER_VALUE_AVG  |
       PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
       PNG_ALL_FILTERS);

@@ -2564,6 +2613,15 @@ Some of the more important parts of the png_info are:
                     can also be
                     PNG_INTRAPIXEL_DIFFERENCING)

+If you call png_set_IHDR(), the call must appear before any of the
+other png_set_*() functions, because they might require access to some of
+the IHDR settings.  The remaining png_set_*() functions can be called
+in any order.
+
+If you wish, you can reset the compression_type, interlace_type, or
+filter_method later by calling png_set_IHDR() again; if you do this, the
+width, height, bit_depth, and color_type must be the same in each call.
+
    png_set_PLTE(png_ptr, info_ptr, palette,
       num_palette);
    palette        - the palette for the file
@@ -2623,10 +2681,11 @@ Some of the more important parts of the png_info are:

    png_set_tRNS(png_ptr, info_ptr, trans, num_trans,
       trans_values);
-    trans          - array of transparent entries for
-                     palette (PNG_INFO_tRNS)
-    trans_values   - graylevel or color sample values of
-                     the single transparent color for
+    trans          - array of transparent
+                     entries for palette (PNG_INFO_tRNS)
+    trans_values   - graylevel or color sample values
+                     (in order red, green, blue) of the
+                     single transparent color for
                     non-paletted images (PNG_INFO_tRNS)
    num_trans      - number of transparent entries
                     (PNG_INFO_tRNS)
@@ -2835,7 +2894,12 @@ transformations are permitted, enabled by the following masks.
    PNG_TRANSFORM_INVERT_ALPHA  Change alpha from opacity
                                to transparency
    PNG_TRANSFORM_SWAP_ENDIAN   Byte-swap 16-bit samples
-    PNG_TRANSFORM_STRIP_FILLER  Strip out filler bytes.
+    PNG_TRANSFORM_STRIP_FILLER        Strip out filler
+                                      bytes (deprecated).
+    PNG_TRANSFORM_STRIP_FILLER_BEFORE Strip out leading
+                                      filler bytes
+    PNG_TRANSFORM_STRIP_FILLER_AFTER  Strip out trailing
+                                      filler bytes

 If you have valid image data in the info structure (you can use
 png_set_rows() to put image data in the info structure), simply do this:
@@ -3212,6 +3276,9 @@ Your malloc_fn() must return NULL in case of failure.  The png_malloc()
 function will normally call png_error() if it receives a NULL from the
 system memory allocator or from your replacement malloc_fn().

+Your free_fn() will never be called with a NULL ptr, since libpng's
+png_free() checks for NULL before calling free_fn().
+
 Input/Output in libpng is done through png_read() and png_write(),
 which currently just call fread() and fwrite().  The FILE * is stored in
 png_struct and is initialized via png_init_io().  If you wish to change
@@ -3239,9 +3306,15 @@ The replacement I/O functions must have prototypes as follows:
        png_bytep data, png_size_t length);
    void user_flush_data(png_structp png_ptr);

+The user_read_data() function is responsible for detecting and
+handling end-of-data errors.
+
 Supplying NULL for the read, write, or flush functions sets them back
-to using the default C stream functions.  It is an error to read from
-a write stream, and vice versa.
+to using the default C stream functions, which expect the io_ptr to
+point to a standard *FILE structure.  It is probably a mistake
+to use NULL for one of write_data_fn and output_flush_fn but not both
+of them, unless you have built libpng with PNG_NO_WRITE_FLUSH defined.
+It is an error to read from a write stream, and vice versa.

 Error handling in libpng is done through png_error() and png_warning().
 Errors handled through png_error() are fatal, meaning that png_error()
@@ -3346,11 +3419,12 @@ you may also have to change the memory allocators (png_malloc, etc.).

 .SS Configuring for compiler xxx:

-All includes for libpng are in pngconf.h.  If you need to add/change/delete
-an include, this is the place to do it.  The includes that are not
-needed outside libpng are protected by the PNG_INTERNAL definition,
-which is only defined for those routines inside libpng itself.  The
-files in libpng proper only include png.h, which includes pngconf.h.
+All includes for libpng are in pngconf.h.  If you need to add, change
+or delete an include, this is the place to do it.
+The includes that are not needed outside libpng are protected by the
+PNG_INTERNAL definition, which is only defined for those routines inside
+libpng itself.  The files in libpng proper only include png.h, which
+includes pngconf.h.

 .SS Configuring zlib:

@@ -3419,7 +3493,7 @@ currently does not allocate the filter buffers until png_write_row()
 is called for the first time.)

    filters = PNG_FILTER_NONE | PNG_FILTER_SUB
-              PNG_FILTER_UP | PNG_FILTER_AVE |
+              PNG_FILTER_UP | PNG_FILTER_AVG |
              PNG_FILTER_PAETH | PNG_ALL_FILTERS;

    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
@@ -3541,7 +3615,7 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
 having level = 0 will be printed.  There aren't any such statements in
 this version of libpng, but if you insert some they will be printed.

-.SH VII.  MNG support
+.SH VI.  MNG support

 The MNG specification (available at http://www.libpng.org/pub/mng) allows
 certain extensions to PNG for PNG images that are embedded in MNG datastreams.
@@ -3566,7 +3640,7 @@ or any other MNG chunks; your application must provide its own support for
 them.  You may wish to consider using libmng (available at
 http://www.libmng.com) instead.

-.SH VIII.  Changes to Libpng from version 0.88
+.SH VII.  Changes to Libpng from version 0.88

 It should be noted that versions of libpng later than 0.96 are not
 distributed by the original libpng author, Guy Schalnat, nor by
@@ -3615,15 +3689,203 @@ application:

   png_uint_32 application_vn = PNG_LIBPNG_VER;

-.SH IX. Y2K Compliance in libpng
+.SH VIII.  Changes to Libpng from version 1.0.x to 1.2.x

-November 6, 2007
+Support for user memory management was enabled by default.  To
+accomplish this, the functions png_create_read_struct_2(),
+png_create_write_struct_2(), png_set_mem_fn(), png_get_mem_ptr(),
+png_malloc_default(), and png_free_default() were added.
+
+Support for certain MNG features was enabled.
+
+Support for numbered error messages was added.  However, we never got
+around to actually numbering the error messages.  The function
+png_set_strip_error_numbers() was added (Note: the prototype for this
+function was inadvertently removed from png.h in PNG_NO_ASSEMBLER_CODE
+builds of libpng-1.2.15.  It was restored in libpng-1.2.36).
+
+The png_malloc_warn() function was added at libpng-1.2.3.  This issues
+a png_warning and returns NULL instead of aborting when it fails to
+acquire the requested memory allocation.
+
+Support for setting user limits on image width and height was enabled
+by default.  The functions png_set_user_limits(), png_get_user_width_max(),
+and png_get_user_height_max() were added at libpng-1.2.6.
+
+The png_set_add_alpha() function was added at libpng-1.2.7.
+
+The function png_set_expand_gray_1_2_4_to_8() was added at libpng-1.2.9.
+Unlike png_set_gray_1_2_4_to_8(), the new function does not expand the
+tRNS chunk to alpha. The png_set_gray_1_2_4_to_8() function is
+deprecated.
+
+A number of macro definitions in support of runtime selection of
+assembler code features (especially Intel MMX code support) were
+added at libpng-1.2.0:
+
+    PNG_ASM_FLAG_MMX_SUPPORT_COMPILED
+    PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
+    PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
+    PNG_ASM_FLAG_MMX_READ_INTERLACE
+    PNG_ASM_FLAG_MMX_READ_FILTER_SUB
+    PNG_ASM_FLAG_MMX_READ_FILTER_UP
+    PNG_ASM_FLAG_MMX_READ_FILTER_AVG
+    PNG_ASM_FLAG_MMX_READ_FILTER_PAETH
+    PNG_ASM_FLAGS_INITIALIZED
+    PNG_MMX_READ_FLAGS
+    PNG_MMX_FLAGS
+    PNG_MMX_WRITE_FLAGS
+    PNG_MMX_FLAGS
+
+We added the following functions in support of runtime
+selection of assembler code features:
+
+    png_get_mmx_flagmask()
+    png_set_mmx_thresholds()
+    png_get_asm_flags()
+    png_get_mmx_bitdepth_threshold()
+    png_get_mmx_rowbytes_threshold()
+    png_set_asm_flags()
+
+We replaced all of these functions with simple stubs in libpng-1.2.20,
+when the Intel assembler code was removed due to a licensing issue.
+
+.SH IX.  (Omitted)
+.SH X. Detecting libpng
+
+The png_get_io_ptr() function has been present since libpng-0.88, has never
+changed, and is unaffected by conditional compilation macros.  It is the
+best choice for use in configure scripts for detecting the presence of any
+libpng version since 0.88.  In an autoconf "configure.in" you could use
+
+    AC_CHECK_LIB(png, png_get_io_ptr, ...
+
+.SH XI. Source code repository
+
+Since about February 2009, version 1.2.34, libpng has been under "git" source
+control.  The git repository was built from old libpng-x.y.z.tar.gz files
+going back to version 0.70.  You can access the git repository (read only)
+at
+
+    git://libpng.git.sourceforge.net/gitroot/libpng
+
+or you can browse it via "gitweb" at
+
+    http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng
+
+Patches can be sent to glennrp at users.sourceforge.net or to
+png-mng-implement at lists.sourceforge.net or you can upload them to
+the libpng bug tracker at
+
+    http://libpng.sourceforge.net
+
+.SH XII. Coding style
+
+Our coding style is similar to the "Allman" style, with curly
+braces on separate lines:
+
+    if (condition)
+    {
+       action;
+    }
+
+    else if (another condition)
+    {
+       another action;
+    }
+
+The braces can be omitted from simple one-line actions:
+
+    if (condition)
+       return (0);
+
+We use 3-space indentation, except for continued statements which
+are usually indented the same as the first line of the statement
+plus four more spaces.
+
+Comments appear with the leading "/*" at the same indentation as
+the statement that follows the comment:
+
+    /* Single-line comment */
+    statement;
+
+    /* Multiple-line
+     * comment
+     */
+    statement;
+
+Very short comments can be placed at the end of the statement
+to which they pertain:
+
+    statement;    /* comment */
+
+We don't use C++ style ("//") comments. We have, however,
+used them in the past in some now-abandoned MMX assembler
+code.
+
+Functions and their curly braces are not indented, and
+exported functions are marked with PNGAPI:
+
+ /* This is a public function that is visible to
+  * application programers. It does thus-and-so.
+  */
+ void PNGAPI
+ png_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for all exported functions appear in png.h,
+above the comment that says
+
+    /* Maintainer: Put new public prototypes here ... */
+
+We mark all non-exported functions with "/* PRIVATE */"":
+
+ void /* PRIVATE */
+ png_non_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for non-exported functions (except for those in
+pngtest) appear in
+the PNG_INTERNAL section of png.h
+above the comment that says
+
+  /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
+
+The names of all exported functions and variables begin
+with  "png_", and all publicly visible C preprocessor
+macros begin with "PNG_".
+
+We put a space after each comma and after each semicolon
+in "for" statments, and we put spaces before and after each
+C binary operator and after "for" or "while".  We don't
+put a space between a typecast and the expression being
+cast, nor do we put one between a function name and the
+left parenthesis that follows it:
+
+    for (i = 2; i > 0; --i)
+       y[i] = a(x) + (int)b;
+
+We prefer #ifdef and #ifndef to #if defined() and if !defined()
+when there is only one macro being tested.
+
+We do not use the TAB character for indentation in the C sources.
+
+Other rules can be inferred by inspecting the libpng
+source.
+
+.SH XIII. Y2K Compliance in libpng
+
+September 30, 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 1.2.23 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.41beta02 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 that
@@ -3834,6 +4096,80 @@ the first widely used release:
 1.2.23beta01-05     13    10223  12.so.0.23[.0]
 1.2.23rc01          13    10223  12.so.0.23[.0]
 1.2.23              13    10223  12.so.0.23[.0]
+ 1.2.24beta01-02     13    10224  12.so.0.24[.0]
+ 1.2.24rc01          13    10224  12.so.0.24[.0]
+ 1.2.24              13    10224  12.so.0.24[.0]
+ 1.2.25beta01-06     13    10225  12.so.0.25[.0]
+ 1.2.25rc01-02       13    10225  12.so.0.25[.0]
+ 1.0.31              10    10031  10.so.0.31[.0]
+ 1.2.25              13    10225  12.so.0.25[.0]
+ 1.2.26beta01-06     13    10226  12.so.0.26[.0]
+ 1.2.26rc01          13    10226  12.so.0.26[.0]
+ 1.2.26              13    10226  12.so.0.26[.0]
+ 1.0.32              10    10032  10.so.0.32[.0]
+ 1.2.27beta01-06     13    10227  12.so.0.27[.0]
+ 1.2.27rc01          13    10227  12.so.0.27[.0]
+ 1.0.33              10    10033  10.so.0.33[.0]
+ 1.2.27              13    10227  12.so.0.27[.0]
+ 1.0.34              10    10034  10.so.0.34[.0]
+ 1.2.28              13    10228  12.so.0.28[.0]
+ 1.2.29beta01-03     13    10229  12.so.0.29[.0]
+ 1.2.29rc01          13    10229  12.so.0.29[.0]
+ 1.0.35              10    10035  10.so.0.35[.0]
+ 1.2.29              13    10229  12.so.0.29[.0]
+ 1.0.37              10    10037  10.so.0.37[.0]
+ 1.2.30beta01-04     13    10230  12.so.0.30[.0]
+ 1.0.38rc01-08       10    10038  10.so.0.38[.0]
+ 1.2.30rc01-08       13    10230  12.so.0.30[.0]
+ 1.0.38              10    10038  10.so.0.38[.0]
+ 1.2.30              13    10230  12.so.0.30[.0]
+ 1.0.39rc01-03       10    10039  10.so.0.39[.0]
+ 1.2.31rc01-03       13    10231  12.so.0.31[.0]
+ 1.0.39              10    10039  10.so.0.39[.0]
+ 1.2.31              13    10231  12.so.0.31[.0]
+ 1.2.32beta01-02     13    10232  12.so.0.32[.0]
+ 1.0.40rc01          10    10040  10.so.0.40[.0]
+ 1.2.32rc01          13    10232  12.so.0.32[.0]
+ 1.0.40              10    10040  10.so.0.40[.0]
+ 1.2.32              13    10232  12.so.0.32[.0]
+ 1.2.33beta01-02     13    10233  12.so.0.33[.0]
+ 1.2.33rc01-02       13    10233  12.so.0.33[.0]
+ 1.0.41rc01          10    10041  10.so.0.41[.0]
+ 1.2.33              13    10233  12.so.0.33[.0]
+ 1.0.41              10    10041  10.so.0.41[.0]
+ 1.2.34beta01-07     13    10234  12.so.0.34[.0]
+ 1.0.42rc01          10    10042  10.so.0.42[.0]
+ 1.2.34rc01          13    10234  12.so.0.34[.0]
+ 1.0.42              10    10042  10.so.0.42[.0]
+ 1.2.34              13    10234  12.so.0.34[.0]
+ 1.2.35beta01-03     13    10235  12.so.0.35[.0]
+ 1.0.43rc01-02       10    10043  10.so.0.43[.0]
+ 1.2.35rc01-02       13    10235  12.so.0.35[.0]
+ 1.0.43              10    10043  10.so.0.43[.0]
+ 1.2.35              13    10235  12.so.0.35[.0]
+ 1.2.36beta01-05     13    10236  12.so.0.36[.0]
+ 1.2.36rc01          13    10236  12.so.0.36[.0]
+ 1.0.44              10    10044  10.so.0.44[.0]
+ 1.2.36              13    10236  12.so.0.36[.0]
+ 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]
+ 1.2.40beta01        13    10240  12.so.0.40[.0]
+ 1.2.40rc01          13    10240  12.so.0.40[.0]
+ 1.0.49              10    10049  10.so.0.49[.0]
+ 1.2.40              13    10240  12.so.0.40[.0]
+ 1.0.50              10    10050  10.so.0.50[.0]
+ 1.2.41alpha01       13    10241  12.so.0.41[.0]

 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3869,7 +4205,7 @@ ftp://ftp.info-zip.org/pub/infozip/zlib
 .I libpng
 or at
 .br
-ftp://ds.internic.net/rfc/rfc2083.txt
+ftp://ftp.rfc-editor.org:/in-notes/rfc2083.txt
 .br
 or (as a W3C Recommendation) at
 .br
@@ -3889,7 +4225,7 @@ possible without all of you.

 Thanks to Frank J. T. Wojcik for helping with the documentation.

-Libpng version 1.2.23 - November 6, 2007:
+Libpng version 1.2.41beta02 - September 30, 2009:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).

@@ -3910,8 +4246,10 @@ included in the libpng distribution, the latter shall prevail.)
 If you modify libpng you may insert additional notices immediately following
 this sentence.

-libpng versions 1.2.6, August 15, 2004, through 1.2.23, November 6, 2007, are
-Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.2.41beta02, September 30, 2009, are
+Copyright (c) 2004,2006-2008 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

@@ -4009,7 +4347,7 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-November 6, 2007
+September 30, 2009

 .\" end of man page

--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,12 +1,16 @@
-.TH LIBPNGPF 3 "November 6, 2007"
+.TH LIBPNGPF 3 "September 30, 2009"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.41beta02
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP

 \fI\fB

+\fBvoid png_64bit_product (long \fP\fIv1\fP\fB, long \fP\fIv2\fP\fB, unsigned long \fI*hi_product,
+
+\fBunsigned long \fI*lo_product\fP\fB);\fP
+
 \fI\fB

 \fBvoid png_build_gamma_table (png_structp \fIpng_ptr\fP\fB);\fP
@@ -27,6 +31,18 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23

 \fI\fB

+\fBint png_check_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_fixed_point \fP\fIint_white_x\fP\fB, png_fixed_point \fP\fIint_white_y\fP\fB, png_fixed_point \fP\fIint_red_x\fP\fB, png_fixed_point \fP\fIint_red_y\fP\fB, png_fixed_point \fP\fIint_green_x\fP\fB, png_fixed_point \fP\fIint_green_y\fP\fB, png_fixed_point \fP\fIint_blue_x\fP\fB, png_fixed_point \fIint_blue_y\fP\fB);\fP
+
+\fI\fB
+
+\fI\fB
+
+\fBvoid png_check_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIinterlace_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fIfilter_type\fP\fB);\fP
+
+\fI\fB
+
+\fI\fB
+
 \fBvoid png_check_chunk_name (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP

 \fI\fB
@@ -81,7 +97,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23

 \fI\fB

-\fBpng_charp png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_charp \fP\fIchunkdata\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP
+\fBvoid png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_charp \fP\fIchunkdata\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP

 \fI\fB

@@ -537,6 +553,12 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23

 \fI\fB

+\fBpng_uint_32 png_read_chunk_header (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fI\fB
+
 \fBvoid png_read_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP

 \fI\fB
--- a/ltmain.sh
+++ b/ltmain.sh
--- a/227
+++ b/227
@@ -1,6 +1,10 @@
 #! /bin/sh
 # Common stub for a few missing GNU programs while installing.
-# Copyright 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
+
+scriptversion=2009-04-28.21; # UTC
+
+# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006,
+# 2008, 2009 Free Software Foundation, Inc.
 # Originally by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.

 # This program is free software; you can redistribute it and/or modify
@@ -14,9 +18,7 @@
 # GNU General Public License for more details.

 # You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-# 02111-1307, USA.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
@@ -29,6 +31,8 @@ if test $# -eq 0; then
 fi

 run=:
+sed_output='s/.* --output[ =]\([^ ]*\).*/\1/p'
+sed_minuso='s/.* -o \([^ ]*\).*/\1/p'

 # In the cases where this matters, `missing' is being run in the
 # srcdir already.
@@ -38,18 +42,24 @@ else
  configure_ac=configure.in
 fi

-case "$1" in
+msg="missing on your system"
+
+case $1 in
 --run)
  # Try to run requested program, and just exit if it succeeds.
  run=
  shift
  "$@" && exit 0
+  # Exit code 63 means version mismatch.  This often happens
+  # when the user try to use an ancient version of a tool on
+  # a file that requires a minimum version.  In this case we
+  # we should proceed has if the program had been absent, or
+  # if --run hadn't been passed.
+  if test $? = 63; then
+    run=:
+    msg="probably too old"
+  fi
  ;;
-esac
-
-# If it does not exist, or fails to run (possibly an outdated version),
-# try to emulate it.
-case "$1" in

  -h|--h|--he|--hel|--help)
    echo "\
@@ -67,6 +77,7 @@ Supported PROGRAM values:
  aclocal      touch file \`aclocal.m4'
  autoconf     touch file \`configure'
  autoheader   touch file \`config.h.in'
+  autom4te     touch the output file, or create a stub one
  automake     touch all \`Makefile.in' files
  bison        create \`y.tab.[ch]', if possible, from existing .[ch]
  flex         create \`lex.yy.c', if possible, from existing .c
@@ -74,11 +85,18 @@ Supported PROGRAM values:
  lex          create \`lex.yy.c', if possible, from existing .c
  makeinfo     touch the output file
  tar          try tar, gnutar, gtar, then tar without non-portable flags
-  yacc         create \`y.tab.[ch]', if possible, from existing .[ch]"
+  yacc         create \`y.tab.[ch]', if possible, from existing .[ch]
+
+Version suffixes to PROGRAM as well as the prefixes \`gnu-', \`gnu', and
+\`g' are ignored when checking the name.
+
+Send bug reports to <bug-automake@gnu.org>."
+    exit $?
    ;;

  -v|--v|--ve|--ver|--vers|--versi|--versio|--version)
-    echo "missing 0.3 - GNU automake"
+    echo "missing $scriptversion (GNU Automake)"
+    exit $?
    ;;

  -*)
@@ -87,27 +105,69 @@ Supported PROGRAM values:
    exit 1
    ;;

-  aclocal)
+esac
+
+# normalize program name to check for.
+program=`echo "$1" | sed '
+  s/^gnu-//; t
+  s/^gnu//; t
+  s/^g//; t'`
+
+# Now exit if we have it, but it failed.  Also exit now if we
+# don't have it and --version was passed (most likely to detect
+# the program).  This is about non-GNU programs, so use $1 not
+# $program.
+case $1 in
+  lex*|yacc*)
+    # Not GNU programs, they don't have --version.
+    ;;
+
+  tar*)
+    if test -n "$run"; then
+       echo 1>&2 "ERROR: \`tar' requires --run"
+       exit 1
+    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
+       exit 1
+    fi
+    ;;
+
+  *)
+    if test -z "$run" && ($1 --version) > /dev/null 2>&1; then
+       # We have it, but it failed.
+       exit 1
+    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
+       # Could not run --version or --help.  This is probably someone
+       # running `$TOOL --version' or `$TOOL --help' to check whether
+       # $TOOL exists and not knowing $TOOL uses missing.
+       exit 1
+    fi
+    ;;
+esac
+
+# If it does not exist, or fails to run (possibly an outdated version),
+# try to emulate it.
+case $program in
+  aclocal*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is $msg.  You should only need it if
         you modified \`acinclude.m4' or \`${configure_ac}'.  You might want
         to install the \`Automake' and \`Perl' packages.  Grab them from
         any GNU archive site."
    touch aclocal.m4
    ;;

-  autoconf)
+  autoconf*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is $msg.  You should only need it if
         you modified \`${configure_ac}'.  You might want to install the
         \`Autoconf' and \`GNU m4' packages.  Grab them from any GNU
         archive site."
    touch configure
    ;;

-  autoheader)
+  autoheader*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is $msg.  You should only need it if
         you modified \`acconfig.h' or \`${configure_ac}'.  You might want
         to install the \`Autoconf' and \`GNU m4' packages.  Grab them
         from any GNU archive site."
@@ -115,7 +175,7 @@ WARNING: \`$1' is missing on your system.  You should only need it if
    test -z "$files" && files="config.h"
    touch_files=
    for f in $files; do
-      case "$f" in
+      case $f in
      *:*) touch_files="$touch_files "`echo "$f" |
 				       sed -e 's/^[^:]*://' -e 's/:.*//'`;;
      *) touch_files="$touch_files $f.in";;
@@ -124,9 +184,9 @@ WARNING: \`$1' is missing on your system.  You should only need it if
    touch $touch_files
    ;;

-  automake)
+  automake*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is $msg.  You should only need it if
         you modified \`Makefile.am', \`acinclude.m4' or \`${configure_ac}'.
         You might want to install the \`Automake' and \`Perl' packages.
         Grab them from any GNU archive site."
@@ -135,128 +195,153 @@ WARNING: \`$1' is missing on your system.  You should only need it if
 	   while read f; do touch "$f"; done
    ;;

-  bison|yacc)
+  autom4te*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is needed, but is $msg.
+         You might have modified some files without having the
+         proper tools for further handling them.
+         You can get \`$1' as part of \`Autoconf' from any GNU
+         archive site."
+
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -f "$file"; then
+	touch $file
+    else
+	test -z "$file" || exec >$file
+	echo "#! /bin/sh"
+	echo "# Created by GNU Automake missing as a replacement of"
+	echo "#  $ $@"
+	echo "exit 0"
+	chmod +x $file
+	exit 1
+    fi
+    ;;
+
+  bison*|yacc*)
+    echo 1>&2 "\
+WARNING: \`$1' $msg.  You should only need it if
         you modified a \`.y' file.  You may need the \`Bison' package
         in order for those modifications to take effect.  You can get
         \`Bison' from any GNU archive site."
    rm -f y.tab.c y.tab.h
-    if [ $# -ne 1 ]; then
+    if test $# -ne 1; then
        eval LASTARG="\${$#}"
-	case "$LASTARG" in
+	case $LASTARG in
 	*.y)
 	    SRCFILE=`echo "$LASTARG" | sed 's/y$/c/'`
-	    if [ -f "$SRCFILE" ]; then
+	    if test -f "$SRCFILE"; then
 	         cp "$SRCFILE" y.tab.c
 	    fi
 	    SRCFILE=`echo "$LASTARG" | sed 's/y$/h/'`
-	    if [ -f "$SRCFILE" ]; then
+	    if test -f "$SRCFILE"; then
 	         cp "$SRCFILE" y.tab.h
 	    fi
 	  ;;
 	esac
    fi
-    if [ ! -f y.tab.h ]; then
+    if test ! -f y.tab.h; then
 	echo >y.tab.h
    fi
-    if [ ! -f y.tab.c ]; then
+    if test ! -f y.tab.c; then
 	echo 'main() { return 0; }' >y.tab.c
    fi
    ;;

-  lex|flex)
+  lex*|flex*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is $msg.  You should only need it if
         you modified a \`.l' file.  You may need the \`Flex' package
         in order for those modifications to take effect.  You can get
         \`Flex' from any GNU archive site."
    rm -f lex.yy.c
-    if [ $# -ne 1 ]; then
+    if test $# -ne 1; then
        eval LASTARG="\${$#}"
-	case "$LASTARG" in
+	case $LASTARG in
 	*.l)
 	    SRCFILE=`echo "$LASTARG" | sed 's/l$/c/'`
-	    if [ -f "$SRCFILE" ]; then
+	    if test -f "$SRCFILE"; then
 	         cp "$SRCFILE" lex.yy.c
 	    fi
 	  ;;
 	esac
    fi
-    if [ ! -f lex.yy.c ]; then
+    if test ! -f lex.yy.c; then
 	echo 'main() { return 0; }' >lex.yy.c
    fi
    ;;

-  help2man)
+  help2man*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is $msg.  You should only need it if
 	 you modified a dependency of a manual page.  You may need the
 	 \`Help2man' package in order for those modifications to take
 	 effect.  You can get \`Help2man' from any GNU archive site."

-    file=`echo "$*" | sed -n 's/.*-o \([^ ]*\).*/\1/p'`
-    if test -z "$file"; then
-	file=`echo "$*" | sed -n 's/.*--output=\([^ ]*\).*/\1/p'`
-    fi
-    if [ -f "$file" ]; then
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -f "$file"; then
 	touch $file
    else
 	test -z "$file" || exec >$file
 	echo ".ab help2man is required to generate this page"
-	exit 1
+	exit $?
    fi
    ;;

-  makeinfo)
-    if test -z "$run" && (makeinfo --version) > /dev/null 2>&1; then
-       # We have makeinfo, but it failed.
-       exit 1
-    fi
-
+  makeinfo*)
    echo 1>&2 "\
-WARNING: \`$1' is missing on your system.  You should only need it if
+WARNING: \`$1' is $msg.  You should only need it if
         you modified a \`.texi' or \`.texinfo' file, or any other file
         indirectly affecting the aspect of the manual.  The spurious
         call might also be the consequence of using a buggy \`make' (AIX,
         DU, IRIX).  You might want to install the \`Texinfo' package or
         the \`GNU make' package.  Grab either from any GNU archive site."
-    file=`echo "$*" | sed -n 's/.*-o \([^ ]*\).*/\1/p'`
+    # The file to touch is that specified with -o ...
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
    if test -z "$file"; then
-      file=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'`
-      file=`sed -n '/^@setfilename/ { s/.* \([^ ]*\) *$/\1/; p; q; }' $file`
+      # ... or it is the one specified with @setfilename ...
+      infile=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'`
+      file=`sed -n '
+	/^@setfilename/{
+	  s/.* \([^ ]*\) *$/\1/
+	  p
+	  q
+	}' $infile`
+      # ... or it is derived from the source name (dir/f.texi becomes f.info)
+      test -z "$file" && file=`echo "$infile" | sed 's,.*/,,;s,.[^.]*$,,'`.info
    fi
+    # If the file does not exist, the user really needs makeinfo;
+    # let's fail without touching anything.
+    test -f $file || exit 1
    touch $file
    ;;

-  tar)
+  tar*)
    shift
-    if test -n "$run"; then
-      echo 1>&2 "ERROR: \`tar' requires --run"
-      exit 1
-    fi

    # We have already tried tar in the generic part.
    # Look for gnutar/gtar before invocation to avoid ugly error
    # messages.
    if (gnutar --version > /dev/null 2>&1); then
-       gnutar ${1+"$@"} && exit 0
+       gnutar "$@" && exit 0
    fi
    if (gtar --version > /dev/null 2>&1); then
-       gtar ${1+"$@"} && exit 0
+       gtar "$@" && exit 0
    fi
    firstarg="$1"
    if shift; then
-	case "$firstarg" in
+	case $firstarg in
 	*o*)
 	    firstarg=`echo "$firstarg" | sed s/o//`
-	    tar "$firstarg" ${1+"$@"} && exit 0
+	    tar "$firstarg" "$@" && exit 0
 	    ;;
 	esac
-	case "$firstarg" in
+	case $firstarg in
 	*h*)
 	    firstarg=`echo "$firstarg" | sed s/h//`
-	    tar "$firstarg" ${1+"$@"} && exit 0
+	    tar "$firstarg" "$@" && exit 0
 	    ;;
 	esac
    fi
@@ -270,10 +355,10 @@ WARNING: I can't seem to be able to run \`tar' with the given arguments.

  *)
    echo 1>&2 "\
-WARNING: \`$1' is needed, and you do not seem to have it handy on your
-         system.  You might have modified some files without having the
+WARNING: \`$1' is needed, and is $msg.
+         You might have modified some files without having the
         proper tools for further handling them.  Check the \`README' file,
-         it often tells you about the needed prerequirements for installing
+         it often tells you about the needed prerequisites for installing
         this package.  You may also peek at any GNU archive site, in case
         some other package would contain this missing \`$1' program."
    exit 1
@@ -281,3 +366,11 @@ WARNING: \`$1' is needed, and you do not seem to have it handy on your
 esac

 exit 0
+
+# Local variables:
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:
--- a/168
+++ b/168
@@ -1,40 +1,162 @@
 #! /bin/sh
 # mkinstalldirs --- make directory hierarchy
-# Author: Noah Friedman <friedman@prep.ai.mit.edu>
+
+scriptversion=2009-04-28.21; # UTC
+
+# Original author: Noah Friedman <friedman@prep.ai.mit.edu>
 # Created: 1993-05-16
-# Public domain
-
-# $Id: mkinstalldirs,v 1.13 1999/01/05 03:18:55 bje Exp $
+# Public domain.
+#
+# This file is maintained in Automake, please report
+# bugs to <bug-automake@gnu.org> or send patches to
+# <automake-patches@gnu.org>.

+nl='
+'
+IFS=" ""	$nl"
 errstatus=0
+dirmode=
+
+usage="\
+Usage: mkinstalldirs [-h] [--help] [--version] [-m MODE] DIR ...
+
+Create each directory DIR (with mode MODE, if specified), including all
+leading file name components.
+
+Report bugs to <bug-automake@gnu.org>."
+
+# process command line arguments
+while test $# -gt 0 ; do
+  case $1 in
+    -h | --help | --h*)         # -h for help
+      echo "$usage"
+      exit $?
+      ;;
+    -m)                         # -m PERM arg
+      shift
+      test $# -eq 0 && { echo "$usage" 1>&2; exit 1; }
+      dirmode=$1
+      shift
+      ;;
+    --version)
+      echo "$0 $scriptversion"
+      exit $?
+      ;;
+    --)                         # stop option processing
+      shift
+      break
+      ;;
+    -*)                         # unknown option
+      echo "$usage" 1>&2
+      exit 1
+      ;;
+    *)                          # first non-opt arg
+      break
+      ;;
+  esac
+done

 for file
 do
-   set fnord `echo ":$file" | sed -ne 's/^:\//#/;s/^://;s/\// /g;s/^#/\//;p'`
-   shift
+  if test -d "$file"; then
+    shift
+  else
+    break
+  fi
+done

-   pathcomp=
-   for d
-   do
-     pathcomp="$pathcomp$d"
-     case "$pathcomp" in
-       -* ) pathcomp=./$pathcomp ;;
-     esac
+case $# in
+  0) exit 0 ;;
+esac

-     if test ! -d "$pathcomp"; then
-        echo "mkdir $pathcomp"
+# Solaris 8's mkdir -p isn't thread-safe.  If you mkdir -p a/b and
+# mkdir -p a/c at the same time, both will detect that a is missing,
+# one will create a, then the other will try to create a and die with
+# a "File exists" error.  This is a problem when calling mkinstalldirs
+# from a parallel make.  We use --version in the probe to restrict
+# ourselves to GNU mkdir, which is thread-safe.
+case $dirmode in
+  '')
+    if mkdir -p --version . >/dev/null 2>&1 && test ! -d ./--version; then
+      echo "mkdir -p -- $*"
+      exec mkdir -p -- "$@"
+    else
+      # On NextStep and OpenStep, the `mkdir' command does not
+      # recognize any option.  It will interpret all options as
+      # directories to create, and then abort because `.' already
+      # exists.
+      test -d ./-p && rmdir ./-p
+      test -d ./--version && rmdir ./--version
+    fi
+    ;;
+  *)
+    if mkdir -m "$dirmode" -p --version . >/dev/null 2>&1 &&
+       test ! -d ./--version; then
+      echo "mkdir -m $dirmode -p -- $*"
+      exec mkdir -m "$dirmode" -p -- "$@"
+    else
+      # Clean up after NextStep and OpenStep mkdir.
+      for d in ./-m ./-p ./--version "./$dirmode";
+      do
+        test -d $d && rmdir $d
+      done
+    fi
+    ;;
+esac

-        mkdir "$pathcomp" || lasterr=$?
+for file
+do
+  case $file in
+    /*) pathcomp=/ ;;
+    *)  pathcomp= ;;
+  esac
+  oIFS=$IFS
+  IFS=/
+  set fnord $file
+  shift
+  IFS=$oIFS

-        if test ! -d "$pathcomp"; then
-  	  errstatus=$lasterr
-        fi
-     fi
+  for d
+  do
+    test "x$d" = x && continue

-     pathcomp="$pathcomp/"
-   done
+    pathcomp=$pathcomp$d
+    case $pathcomp in
+      -*) pathcomp=./$pathcomp ;;
+    esac
+
+    if test ! -d "$pathcomp"; then
+      echo "mkdir $pathcomp"
+
+      mkdir "$pathcomp" || lasterr=$?
+
+      if test ! -d "$pathcomp"; then
+	errstatus=$lasterr
+      else
+	if test ! -z "$dirmode"; then
+	  echo "chmod $dirmode $pathcomp"
+	  lasterr=
+	  chmod "$dirmode" "$pathcomp" || lasterr=$?
+
+	  if test ! -z "$lasterr"; then
+	    errstatus=$lasterr
+	  fi
+	fi
+      fi
+    fi
+
+    pathcomp=$pathcomp/
+  done
 done

 exit $errstatus

-# mkinstalldirs ends here
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "November 6, 2007"
+.TH PNG 5 "September 30, 2009"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
@@ -35,7 +35,7 @@ PNG 1.0 specification, October 1996:
 RFC 2083
 .IP
 .br
-ftp://ds.internic.net/rfc/rfc2083.txt
+ftp://ftp.rfc-editor.org:/in-notes/rfc2083.txt
 .br
 or (as a W3C Recommendation) at
 .br
--- a/png.c
+++ b/png.c
@@ -1,11 +1,14 @@

 /* png.c - location for general purpose libpng functions
 *
- * Last changed in libpng 1.2.21 October 4, 2007
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.41 [September 30, 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_23 Your_png_h_is_not_version_1_2_23;
+typedef version_1_2_41beta02 Your_png_h_is_not_version_1_2_41beta02;

 /* Version information for C files.  This had better match the version
 * string defined in png.h.  */
@@ -53,18 +56,18 @@ PNG_tRNS;
 PNG_zTXt;

 #ifdef PNG_READ_SUPPORTED
-/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */

-/* start of interlace block */
+/* Start of interlace block */
 PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};

-/* offset to next interlace block */
+/* Offset to next interlace block */
 PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};

-/* start of interlace block in the y direction */
+/* Start of interlace block in the y direction */
 PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};

-/* offset to next interlace block in the y direction */
+/* Offset to next interlace block in the y direction */
 PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};

 /* Height of interlace block.  This is not currently used - if you need
@@ -92,8 +95,9 @@ PNG_CONST int FARDATA png_pass_dsp_mask[]
 void PNGAPI
 png_set_sig_bytes(png_structp png_ptr, int num_bytes)
 {
-   if(png_ptr == NULL) return;
-   png_debug(1, "in png_set_sig_bytes\n");
+   if (png_ptr == NULL)
+      return;
+   png_debug(1, "in png_set_sig_bytes");
   if (num_bytes > 8)
      png_error(png_ptr, "Too many bytes for PNG signature.");

@@ -144,7 +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)
 {
@@ -153,7 +157,8 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
   png_uint_32 save_flags=p->flags;
   png_uint_32 num_bytes;

-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
   if (items > PNG_UINT_32_MAX/size)
   {
     png_warning (p, "Potential overflow in png_zalloc()");
@@ -183,11 +188,11 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
   return ((voidpf)ptr);
 }

-/* function to free memory for zlib */
+/* Function to free memory for zlib */
 #ifdef PNG_1_0_X
 void PNGAPI
 #else
-void /* private */
+void /* PRIVATE */
 #endif
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
@@ -240,8 +245,9 @@ png_create_info_struct(png_structp png_ptr)
 {
   png_infop info_ptr;

-   png_debug(1, "in png_create_info_struct\n");
-   if(png_ptr == NULL) return (NULL);
+   png_debug(1, "in png_create_info_struct");
+   if (png_ptr == NULL)
+      return (NULL);
 #ifdef PNG_USER_MEM_SUPPORTED
   info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
      png_ptr->malloc_fn, png_ptr->mem_ptr);
@@ -263,9 +269,10 @@ void PNGAPI
 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
 {
   png_infop info_ptr = NULL;
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;

-   png_debug(1, "in png_destroy_info_struct\n");
+   png_debug(1, "in png_destroy_info_struct");
   if (info_ptr_ptr != NULL)
      info_ptr = *info_ptr_ptr;

@@ -302,19 +309,20 @@ png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
 {
   png_infop info_ptr = *ptr_ptr;

-   if(info_ptr == NULL) return;
+   if (info_ptr == NULL)
+      return;

-   png_debug(1, "in png_info_init_3\n");
+   png_debug(1, "in png_info_init_3");

-   if(png_sizeof(png_info) > png_info_struct_size)
-     {
-       png_destroy_struct(info_ptr);
-       info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
-       *ptr_ptr = info_ptr;
-     }
+   if (png_sizeof(png_info) > png_info_struct_size)
+   {
+      png_destroy_struct(info_ptr);
+      info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+      *ptr_ptr = info_ptr;
+   }

-   /* set everything to 0 */
-   png_memset(info_ptr, 0, png_sizeof (png_info));
+   /* Set everything to 0 */
+   png_memset(info_ptr, 0, png_sizeof(png_info));
 }

 #ifdef PNG_FREE_ME_SUPPORTED
@@ -322,12 +330,12 @@ void PNGAPI
 png_data_freer(png_structp png_ptr, png_infop info_ptr,
   int freer, png_uint_32 mask)
 {
-   png_debug(1, "in png_data_freer\n");
+   png_debug(1, "in png_data_freer");
   if (png_ptr == NULL || info_ptr == NULL)
      return;
-   if(freer == PNG_DESTROY_WILL_FREE_DATA)
+   if (freer == PNG_DESTROY_WILL_FREE_DATA)
      info_ptr->free_me |= mask;
-   else if(freer == PNG_USER_WILL_FREE_DATA)
+   else if (freer == PNG_USER_WILL_FREE_DATA)
      info_ptr->free_me &= ~mask;
   else
      png_warning(png_ptr,
@@ -339,249 +347,250 @@ void PNGAPI
 png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
   int num)
 {
-   png_debug(1, "in png_free_data\n");
+   png_debug(1, "in png_free_data");
   if (png_ptr == NULL || info_ptr == NULL)
      return;

 #if defined(PNG_TEXT_SUPPORTED)
-/* free text item num or (if num == -1) all text items */
+   /* Free text item num or (if num == -1) all text items */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
+   if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_TEXT)
+   if (mask & PNG_FREE_TEXT)
 #endif
-{
-   if (num != -1)
   {
-     if (info_ptr->text && info_ptr->text[num].key)
-     {
-         png_free(png_ptr, info_ptr->text[num].key);
-         info_ptr->text[num].key = NULL;
-     }
+      if (num != -1)
+      {
+         if (info_ptr->text && info_ptr->text[num].key)
+         {
+            png_free(png_ptr, info_ptr->text[num].key);
+            info_ptr->text[num].key = NULL;
+         }
+      }
+      else
+      {
+         int i;
+         for (i = 0; i < info_ptr->num_text; i++)
+             png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+         png_free(png_ptr, info_ptr->text);
+         info_ptr->text = NULL;
+         info_ptr->num_text=0;
+      }
   }
-   else
-   {
-       int i;
-       for (i = 0; i < info_ptr->num_text; i++)
-           png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
-       png_free(png_ptr, info_ptr->text);
-       info_ptr->text = NULL;
-       info_ptr->num_text=0;
-   }
-}
 #endif

 #if defined(PNG_tRNS_SUPPORTED)
-/* free any tRNS entry */
+   /* Free any tRNS entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+   if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
 #else
-if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
+   if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
 #endif
-{
-    png_free(png_ptr, info_ptr->trans);
-    info_ptr->valid &= ~PNG_INFO_tRNS;
+   {
+      png_free(png_ptr, info_ptr->trans);
+      info_ptr->trans = NULL;
+      info_ptr->valid &= ~PNG_INFO_tRNS;
 #ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+      png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
 #endif
-    info_ptr->trans = NULL;
-}
+   }
 #endif

 #if defined(PNG_sCAL_SUPPORTED)
-/* free any sCAL entry */
+   /* Free any sCAL entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+   if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_SCAL)
+   if (mask & PNG_FREE_SCAL)
 #endif
-{
+   {
 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
-    png_free(png_ptr, info_ptr->scal_s_width);
-    png_free(png_ptr, info_ptr->scal_s_height);
-    info_ptr->scal_s_width = NULL;
-    info_ptr->scal_s_height = NULL;
+      png_free(png_ptr, info_ptr->scal_s_width);
+      png_free(png_ptr, info_ptr->scal_s_height);
+      info_ptr->scal_s_width = NULL;
+      info_ptr->scal_s_height = NULL;
 #endif
-    info_ptr->valid &= ~PNG_INFO_sCAL;
-}
+      info_ptr->valid &= ~PNG_INFO_sCAL;
+   }
 #endif

 #if defined(PNG_pCAL_SUPPORTED)
-/* free any pCAL entry */
+   /* Free any pCAL entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+   if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_PCAL)
+   if (mask & PNG_FREE_PCAL)
 #endif
-{
-    png_free(png_ptr, info_ptr->pcal_purpose);
-    png_free(png_ptr, info_ptr->pcal_units);
-    info_ptr->pcal_purpose = NULL;
-    info_ptr->pcal_units = NULL;
-    if (info_ptr->pcal_params != NULL)
-    {
-        int i;
-        for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
-        {
-          png_free(png_ptr, info_ptr->pcal_params[i]);
-          info_ptr->pcal_params[i]=NULL;
-        }
-        png_free(png_ptr, info_ptr->pcal_params);
-        info_ptr->pcal_params = NULL;
-    }
-    info_ptr->valid &= ~PNG_INFO_pCAL;
-}
+   {
+      png_free(png_ptr, info_ptr->pcal_purpose);
+      png_free(png_ptr, info_ptr->pcal_units);
+      info_ptr->pcal_purpose = NULL;
+      info_ptr->pcal_units = NULL;
+      if (info_ptr->pcal_params != NULL)
+         {
+            int i;
+            for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+            {
+               png_free(png_ptr, info_ptr->pcal_params[i]);
+               info_ptr->pcal_params[i]=NULL;
+            }
+            png_free(png_ptr, info_ptr->pcal_params);
+            info_ptr->pcal_params = NULL;
+         }
+      info_ptr->valid &= ~PNG_INFO_pCAL;
+   }
 #endif

 #if defined(PNG_iCCP_SUPPORTED)
-/* free any iCCP entry */
+   /* Free any iCCP entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+   if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_ICCP)
+   if (mask & PNG_FREE_ICCP)
 #endif
-{
-    png_free(png_ptr, info_ptr->iccp_name);
-    png_free(png_ptr, info_ptr->iccp_profile);
-    info_ptr->iccp_name = NULL;
-    info_ptr->iccp_profile = NULL;
-    info_ptr->valid &= ~PNG_INFO_iCCP;
-}
+   {
+      png_free(png_ptr, info_ptr->iccp_name);
+      png_free(png_ptr, info_ptr->iccp_profile);
+      info_ptr->iccp_name = NULL;
+      info_ptr->iccp_profile = NULL;
+      info_ptr->valid &= ~PNG_INFO_iCCP;
+   }
 #endif

 #if defined(PNG_sPLT_SUPPORTED)
-/* free a given sPLT entry, or (if num == -1) all sPLT entries */
+   /* Free a given sPLT entry, or (if num == -1) all sPLT entries */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
+   if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_SPLT)
+   if (mask & PNG_FREE_SPLT)
 #endif
-{
-   if (num != -1)
   {
-      if(info_ptr->splt_palettes)
+      if (num != -1)
      {
-          png_free(png_ptr, info_ptr->splt_palettes[num].name);
-          png_free(png_ptr, info_ptr->splt_palettes[num].entries);
-          info_ptr->splt_palettes[num].name = NULL;
-          info_ptr->splt_palettes[num].entries = NULL;
+         if (info_ptr->splt_palettes)
+         {
+            png_free(png_ptr, info_ptr->splt_palettes[num].name);
+            png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+            info_ptr->splt_palettes[num].name = NULL;
+            info_ptr->splt_palettes[num].entries = NULL;
+         }
+      }
+      else
+      {
+         if (info_ptr->splt_palettes_num)
+         {
+            int i;
+            for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+               png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
+
+            png_free(png_ptr, info_ptr->splt_palettes);
+            info_ptr->splt_palettes = NULL;
+            info_ptr->splt_palettes_num = 0;
+         }
+         info_ptr->valid &= ~PNG_INFO_sPLT;
      }
   }
-   else
-   {
-       if(info_ptr->splt_palettes_num)
-       {
-         int i;
-         for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
-            png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
-
-         png_free(png_ptr, info_ptr->splt_palettes);
-         info_ptr->splt_palettes = NULL;
-         info_ptr->splt_palettes_num = 0;
-       }
-       info_ptr->valid &= ~PNG_INFO_sPLT;
-   }
-}
 #endif

 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-  if(png_ptr->unknown_chunk.data)
-  {
-    png_free(png_ptr, png_ptr->unknown_chunk.data);
-    png_ptr->unknown_chunk.data = NULL;
-  }
+   if (png_ptr->unknown_chunk.data)
+   {
+      png_free(png_ptr, png_ptr->unknown_chunk.data);
+      png_ptr->unknown_chunk.data = NULL;
+   }
+
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+   if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_UNKN)
+   if (mask & PNG_FREE_UNKN)
 #endif
-{
-   if (num != -1)
   {
-       if(info_ptr->unknown_chunks)
-       {
-          png_free(png_ptr, info_ptr->unknown_chunks[num].data);
-          info_ptr->unknown_chunks[num].data = NULL;
-       }
-   }
-   else
-   {
-       int i;
+      if (num != -1)
+      {
+          if (info_ptr->unknown_chunks)
+          {
+             png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+             info_ptr->unknown_chunks[num].data = NULL;
+          }
+      }
+      else
+      {
+         int i;

-       if(info_ptr->unknown_chunks_num)
-       {
-         for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
-            png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+         if (info_ptr->unknown_chunks_num)
+         {
+            for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+               png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);

-         png_free(png_ptr, info_ptr->unknown_chunks);
-         info_ptr->unknown_chunks = NULL;
-         info_ptr->unknown_chunks_num = 0;
-       }
+            png_free(png_ptr, info_ptr->unknown_chunks);
+            info_ptr->unknown_chunks = NULL;
+            info_ptr->unknown_chunks_num = 0;
+         }
+      }
   }
-}
 #endif

 #if defined(PNG_hIST_SUPPORTED)
-/* free any hIST entry */
+   /* Free any hIST entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
+   if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
 #else
-if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
+   if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
 #endif
-{
-    png_free(png_ptr, info_ptr->hist);
-    info_ptr->hist = NULL;
-    info_ptr->valid &= ~PNG_INFO_hIST;
+   {
+      png_free(png_ptr, info_ptr->hist);
+      info_ptr->hist = NULL;
+      info_ptr->valid &= ~PNG_INFO_hIST;
 #ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+      png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
 #endif
-}
+   }
 #endif

-/* free any PLTE entry that was internally allocated */
+   /* Free any PLTE entry that was internally allocated */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+   if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
 #else
-if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
+   if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
 #endif
-{
-    png_zfree(png_ptr, info_ptr->palette);
-    info_ptr->palette = NULL;
-    info_ptr->valid &= ~PNG_INFO_PLTE;
+   {
+      png_zfree(png_ptr, info_ptr->palette);
+      info_ptr->palette = NULL;
+      info_ptr->valid &= ~PNG_INFO_PLTE;
 #ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+      png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
 #endif
-    info_ptr->num_palette = 0;
-}
+      info_ptr->num_palette = 0;
+   }

 #if defined(PNG_INFO_IMAGE_SUPPORTED)
-/* free any image bits attached to the info structure */
+   /* Free any image bits attached to the info structure */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+   if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_ROWS)
+   if (mask & PNG_FREE_ROWS)
 #endif
-{
-    if(info_ptr->row_pointers)
-    {
-       int row;
-       for (row = 0; row < (int)info_ptr->height; row++)
-       {
-          png_free(png_ptr, info_ptr->row_pointers[row]);
-          info_ptr->row_pointers[row]=NULL;
-       }
-       png_free(png_ptr, info_ptr->row_pointers);
-       info_ptr->row_pointers=NULL;
-    }
-    info_ptr->valid &= ~PNG_INFO_IDAT;
-}
+   {
+      if (info_ptr->row_pointers)
+      {
+         int row;
+         for (row = 0; row < (int)info_ptr->height; row++)
+         {
+            png_free(png_ptr, info_ptr->row_pointers[row]);
+            info_ptr->row_pointers[row]=NULL;
+         }
+         png_free(png_ptr, info_ptr->row_pointers);
+         info_ptr->row_pointers=NULL;
+      }
+      info_ptr->valid &= ~PNG_INFO_IDAT;
+   }
 #endif

 #ifdef PNG_FREE_ME_SUPPORTED
-   if(num == -1)
-     info_ptr->free_me &= ~mask;
+   if (num == -1)
+      info_ptr->free_me &= ~mask;
   else
-     info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+      info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
 #endif
 }

@@ -592,16 +601,16 @@ if (mask & PNG_FREE_ROWS)
 void /* PRIVATE */
 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_info_destroy\n");
+   png_debug(1, "in png_info_destroy");

   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);
-       png_ptr->chunk_list=NULL;
-       png_ptr->num_chunk_list=0;
+      png_free(png_ptr, png_ptr->chunk_list);
+      png_ptr->chunk_list=NULL;
+      png_ptr->num_chunk_list = 0;
   }
 #endif

@@ -616,7 +625,8 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 png_voidp PNGAPI
 png_get_io_ptr(png_structp png_ptr)
 {
-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
   return (png_ptr->io_ptr);
 }

@@ -631,8 +641,9 @@ png_get_io_ptr(png_structp png_ptr)
 void PNGAPI
 png_init_io(png_structp png_ptr, png_FILE_p fp)
 {
-   png_debug(1, "in png_init_io\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_init_io");
+   if (png_ptr == NULL)
+      return;
   png_ptr->io_ptr = (png_voidp)fp;
 }
 #endif
@@ -648,7 +659,8 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
        {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
   if (png_ptr->time_buffer == NULL)
   {
      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
@@ -669,7 +681,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 #ifdef USE_FAR_KEYWORD
   {
      char near_time_buf[29];
-      png_snprintf6(near_time_buf,29,"%d %s %d %02d:%02d:%02d +0000",
+      png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
          ptime->day % 32, short_months[(ptime->month - 1) % 12],
          ptime->year, ptime->hour % 24, ptime->minute % 60,
          ptime->second % 61);
@@ -677,7 +689,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
          29*png_sizeof(char));
   }
 #else
-   png_snprintf6(png_ptr->time_buffer,29,"%d %s %d %02d:%02d:%02d +0000",
+   png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
       ptime->day % 32, short_months[(ptime->month - 1) % 12],
       ptime->year, ptime->hour % 24, ptime->minute % 60,
       ptime->second % 61);
@@ -692,9 +704,9 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 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 1.2.23 - November 6, 2007\n\
-   Copyright (c) 1998-2007 Glenn Randers-Pehrson\n\
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
+   return ((png_charp) "\n libpng version 1.2.41beta02 - September 30, 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");
 }
@@ -711,7 +723,7 @@ png_charp PNGAPI
 png_get_libpng_ver(png_structp png_ptr)
 {
   /* Version of *.c files used when building libpng */
-   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
   return ((png_charp) PNG_LIBPNG_VER_STRING);
 }

@@ -719,7 +731,7 @@ png_charp PNGAPI
 png_get_header_ver(png_structp png_ptr)
 {
   /* Version of *.h files used when building libpng */
-   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
   return ((png_charp) PNG_LIBPNG_VER_STRING);
 }

@@ -727,7 +739,7 @@ png_charp PNGAPI
 png_get_header_version(png_structp png_ptr)
 {
   /* Returns longer string containing both version and date */
-   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
   return ((png_charp) PNG_HEADER_VERSION_STRING
 #ifndef PNG_READ_SUPPORTED
   "     (NO READ SUPPORT)"
@@ -740,15 +752,15 @@ png_get_header_version(png_structp png_ptr)
 int PNGAPI
 png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
 {
-   /* check chunk_name and return "keep" value if it's on the list, else 0 */
+   /* Check chunk_name and return "keep" value if it's on the list, else 0 */
   int i;
   png_bytep p;
-   if(png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
+   if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
      return 0;
-   p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
-   for (i = png_ptr->num_chunk_list; i; i--, p-=5)
+   p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
+   for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
      if (!png_memcmp(chunk_name, p, 4))
-        return ((int)*(p+4));
+        return ((int)*(p + 4));
   return 0;
 }
 #endif
@@ -757,7 +769,8 @@ png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
 int PNGAPI
 png_reset_zstream(png_structp png_ptr)
 {
-   if (png_ptr == NULL) return Z_STREAM_ERROR;
+   if (png_ptr == NULL)
+      return Z_STREAM_ERROR;
   return (inflateReset(&png_ptr->zstream));
 }
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
@@ -773,11 +786,11 @@ png_access_version_number(void)

 #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
 #if !defined(PNG_1_0_X)
-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 int PNGAPI
 png_mmx_support(void)
 {
-   /* obsolete, to be removed from libpng-1.4.0 */
+   /* Obsolete, to be removed from libpng-1.4.0 */
    return -1;
 }
 #endif /* PNG_1_0_X */
@@ -790,9 +803,270 @@ png_mmx_support(void)
 png_size_t PNGAPI
 png_convert_size(size_t size)
 {
-  if (size > (png_size_t)-1)
-     PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
-  return ((png_size_t)size);
+   if (size > (png_size_t)-1)
+      PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
+   return ((png_size_t)size);
 }
 #endif /* PNG_SIZE_T */
+
+/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
+#if defined(PNG_cHRM_SUPPORTED)
+#if !defined(PNG_NO_CHECK_cHRM)
+
+/*
+ *    Multiply two 32-bit numbers, V1 and V2, using 32-bit
+ *    arithmetic, to produce a 64 bit result in the HI/LO words.
+ *
+ *                  A B
+ *                x C D
+ *               ------
+ *              AD || BD
+ *        AC || CB || 0
+ *
+ *    where A and B are the high and low 16-bit words of V1,
+ *    C and D are the 16-bit words of V2, AD is the product of
+ *    A and D, and X || Y is (X << 16) + Y.
+*/
+
+void /* PRIVATE */
+png_64bit_product (long v1, long v2, unsigned long *hi_product,
+   unsigned long *lo_product)
+{
+   int a, b, c, d;
+   long lo, hi, x, y;
+
+   a = (v1 >> 16) & 0xffff;
+   b = v1 & 0xffff;
+   c = (v2 >> 16) & 0xffff;
+   d = v2 & 0xffff;
+
+   lo = b * d;                   /* BD */
+   x = a * d + c * b;            /* AD + CB */
+   y = ((lo >> 16) & 0xffff) + x;
+
+   lo = (lo & 0xffff) | ((y & 0xffff) << 16);
+   hi = (y >> 16) & 0xffff;
+
+   hi += a * c;                  /* AC */
+
+   *hi_product = (unsigned long)hi;
+   *lo_product = (unsigned long)lo;
+}
+
+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,
+   png_fixed_point blue_x, png_fixed_point blue_y)
+{
+   int ret = 1;
+   unsigned long xy_hi,xy_lo,yx_hi,yx_lo;
+
+   png_debug(1, "in function png_check_cHRM_fixed");
+   if (png_ptr == NULL)
+      return 0;
+
+   if (white_x < 0 || white_y <= 0 ||
+         red_x < 0 ||   red_y <  0 ||
+       green_x < 0 || green_y <  0 ||
+        blue_x < 0 ||  blue_y <  0)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set negative chromaticity value");
+      ret = 0;
+   }
+   if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       white_y > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_x > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_y > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_y > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_y > (png_fixed_point) PNG_UINT_31_MAX )
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set chromaticity value exceeding 21474.83");
+      ret = 0;
+   }
+   if (white_x > 100000L - white_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM white point");
+      ret = 0;
+   }
+   if (red_x > 100000L - red_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM red point");
+      ret = 0;
+   }
+   if (green_x > 100000L - green_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM green point");
+      ret = 0;
+   }
+   if (blue_x > 100000L - blue_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM blue point");
+      ret = 0;
+   }
+
+   png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo);
+   png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo);
+
+   if (xy_hi == yx_hi && xy_lo == yx_lo)
+   {
+      png_warning(png_ptr,
+         "Ignoring attempt to set cHRM RGB triangle with zero area");
+      ret = 0;
+   }
+
+   return ret;
+}
+#endif /* NO_PNG_CHECK_cHRM */
+#endif /* PNG_cHRM_SUPPORTED */
+
+
+void /* PRIVATE */
+png_check_IHDR(png_structp png_ptr,
+   png_uint_32 width, png_uint_32 height, int bit_depth,
+   int color_type, int interlace_type, int compression_type,
+   int filter_type)
+{
+   int error = 0;
+
+   /* Check for width and height valid values */
+   if (width == 0)
+   {
+      png_warning(png_ptr, "Image width is zero in IHDR");
+      error = 1;
+   }
+
+   if (height == 0)
+   {
+      png_warning(png_ptr, "Image height is zero in IHDR");
+      error = 1;
+   }
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX)
+   {
+      png_warning(png_ptr, "Image width exceeds user limit in IHDR");
+      error = 1;
+   }
+
+   if (height > png_ptr->user_height_max || height > PNG_USER_HEIGHT_MAX)
+   {
+      png_warning(png_ptr, "Image height exceeds user limit in IHDR");
+      error = 1;
+   }
+
+#else
+   if (width > PNG_USER_WIDTH_MAX
+   {
+      png_warning(png_ptr, "Image width exceeds user limit in IHDR");
+      error = 1;
+   }
+
+   if (height > PNG_USER_HEIGHT_MAX)
+   {
+      png_warning(png_ptr, "Image height exceeds user limit in IHDR");
+      error = 1;
+   }
+#endif
+
+   if (height > PNG_UINT_31_MAX)
+   {
+      png_warning(png_ptr, "Invalid image height in IHDR");
+      error = 1;
+   }
+
+   if ( height > PNG_UINT_31_MAX)
+   {
+      png_warning(png_ptr, "Invalid image width in IHDR");
+      error = 1;
+   }
+
+   if ( width > (PNG_UINT_32_MAX
+                 >> 3)      /* 8-byte RGBA pixels */
+                 - 64       /* bigrowbuf hack */
+                 - 1        /* filter byte */
+                 - 7*8      /* rounding of width to multiple of 8 pixels */
+                 - 8)       /* extra max_pixel_depth pad */
+      png_warning(png_ptr, "Width is too large for libpng to process pixels");
+
+   /* Check other values */
+   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
+       bit_depth != 8 && bit_depth != 16)
+   {
+      png_warning(png_ptr, "Invalid bit depth in IHDR");
+      error = 1;
+   }
+
+   if (color_type < 0 || color_type == 1 ||
+       color_type == 5 || color_type > 6)
+   {
+      png_warning(png_ptr, "Invalid color type in IHDR");
+      error = 1;
+   }
+
+   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
+       ((color_type == PNG_COLOR_TYPE_RGB ||
+         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
+   {
+      png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR");
+      error = 1;
+   }
+
+   if (interlace_type >= PNG_INTERLACE_LAST)
+   {
+      png_warning(png_ptr, "Unknown interlace method in IHDR");
+      error = 1;
+   }
+
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Unknown compression method in IHDR");
+      error = 1;
+   }
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   /* Accept filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not read 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->mode & PNG_HAVE_PNG_SIGNATURE) &&
+       png_ptr->mng_features_permitted)
+      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+
+   if (filter_type != PNG_FILTER_TYPE_BASE)
+   {
+     if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+         (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+         ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) &&
+         (color_type == PNG_COLOR_TYPE_RGB ||
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
+        png_warning(png_ptr, "Unknown filter method in IHDR");
+      error = 1;
+
+     if (png_ptr->mode & PNG_HAVE_PNG_SIGNATURE)
+        png_warning(png_ptr, "Invalid filter method in IHDR");
+   }
+
+#else
+   if (filter_type != PNG_FILTER_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Unknown filter method in IHDR");
+      error = 1;
+   }
+#endif
+
+   if (error == 1)
+      png_error(png_ptr, "Invalid IHDR data");
+}
+
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
--- a/png.h
+++ b/png.h
@@ -1,15 +1,16 @@
-
 /* png.h - header file for PNG reference library
 *
- * libpng version 1.2.23 - November 6, 2007
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * libpng version 1.2.41beta02 - September 30, 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 1.2.23 - November 6, 2007: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.41beta02 - September 30, 2009: Glenn
 *  See also "Contributing Authors", below.
 *
 * Note about libpng version numbers:
@@ -172,6 +173,79 @@
 *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
 *    1.2.23rc01              13    10223  12.so.0.23[.0]
 *    1.2.23                  13    10223  12.so.0.23[.0]
+ *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
+ *    1.2.24rc01              13    10224  12.so.0.24[.0]
+ *    1.2.24                  13    10224  12.so.0.24[.0]
+ *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
+ *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
+ *    1.0.31                  10    10031  10.so.0.31[.0]
+ *    1.2.25                  13    10225  12.so.0.25[.0]
+ *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
+ *    1.2.26rc01              13    10226  12.so.0.26[.0]
+ *    1.2.26                  13    10226  12.so.0.26[.0]
+ *    1.0.32                  10    10032  10.so.0.32[.0]
+ *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
+ *    1.2.27rc01              13    10227  12.so.0.27[.0]
+ *    1.0.33                  10    10033  10.so.0.33[.0]
+ *    1.2.27                  13    10227  12.so.0.27[.0]
+ *    1.0.34                  10    10034  10.so.0.34[.0]
+ *    1.2.28                  13    10228  12.so.0.28[.0]
+ *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
+ *    1.2.29rc01              13    10229  12.so.0.29[.0]
+ *    1.0.35                  10    10035  10.so.0.35[.0]
+ *    1.2.29                  13    10229  12.so.0.29[.0]
+ *    1.0.37                  10    10037  10.so.0.37[.0]
+ *    1.2.30beta01-04         13    10230  12.so.0.30[.0]
+ *    1.0.38rc01-08           10    10038  10.so.0.38[.0]
+ *    1.2.30rc01-08           13    10230  12.so.0.30[.0]
+ *    1.0.38                  10    10038  10.so.0.38[.0]
+ *    1.2.30                  13    10230  12.so.0.30[.0]
+ *    1.0.39rc01-03           10    10039  10.so.0.39[.0]
+ *    1.2.31rc01-03           13    10231  12.so.0.31[.0]
+ *    1.0.39                  10    10039  10.so.0.39[.0]
+ *    1.2.31                  13    10231  12.so.0.31[.0]
+ *    1.2.32beta01-02         13    10232  12.so.0.32[.0]
+ *    1.0.40rc01              10    10040  10.so.0.40[.0]
+ *    1.2.32rc01              13    10232  12.so.0.32[.0]
+ *    1.0.40                  10    10040  10.so.0.40[.0]
+ *    1.2.32                  13    10232  12.so.0.32[.0]
+ *    1.2.33beta01-02         13    10233  12.so.0.33[.0]
+ *    1.2.33rc01-02           13    10233  12.so.0.33[.0]
+ *    1.0.41rc01              10    10041  10.so.0.41[.0]
+ *    1.2.33                  13    10233  12.so.0.33[.0]
+ *    1.0.41                  10    10041  10.so.0.41[.0]
+ *    1.2.34beta01-07         13    10234  12.so.0.34[.0]
+ *    1.0.42rc01              10    10042  10.so.0.42[.0]
+ *    1.2.34rc01              13    10234  12.so.0.34[.0]
+ *    1.0.42                  10    10042  10.so.0.42[.0]
+ *    1.2.34                  13    10234  12.so.0.34[.0]
+ *    1.2.35beta01-03         13    10235  12.so.0.35[.0]
+ *    1.0.43rc01-02           10    10043  10.so.0.43[.0]
+ *    1.2.35rc01-02           13    10235  12.so.0.35[.0]
+ *    1.0.43                  10    10043  10.so.0.43[.0]
+ *    1.2.35                  13    10235  12.so.0.35[.0]
+ *    1.2.36beta01-05         13    10236  12.so.0.36[.0]
+ *    1.2.36rc01              13    10236  12.so.0.36[.0]
+ *    1.0.44                  10    10044  10.so.0.44[.0]
+ *    1.2.36                  13    10236  12.so.0.36[.0]
+ *    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]
+ *    1.2.40beta01            13    10240  12.so.0.40[.0]
+ *    1.2.40rc01              13    10240  12.so.0.40[.0]
+ *    1.0.49                  10    10049  10.so.0.49[.0]
+ *    1.2.40                  13    10240  12.so.0.40[.0]
+ *    1.2.41alpha01           13    10241  12.so.0.41[.0]
 *
 *    Henceforth the source version will match the shared-library major
 *    and minor numbers; the shared-library major version number will be
@@ -181,7 +255,7 @@
 *    to the source version x.y.z (leading zeros in y and z).  Beta versions
 *    were given the previous public release number plus a letter, until
 *    version 1.0.6j; from then on they were given the upcoming public
- *    release number plus "betaNN" or "rcN".
+ *    release number plus "betaNN" or "rcNN".
 *
 *    Binary incompatibility exists only when applications make direct access
 *    to the info_ptr or png_ptr members through png.h, and the compiled
@@ -201,8 +275,10 @@
 * If you modify libpng you may insert additional notices immediately following
 * this sentence.
 *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.23, November 6, 2007, are
- * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
+ * This code is released under the libpng license.
+ *
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.41beta02, September 30, 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:
 *
@@ -313,13 +389,13 @@
 * Y2K compliance in libpng:
 * =========================
 *
- *    November 6, 2007
+ *    September 30, 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 1.2.23 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.41beta02 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
@@ -375,9 +451,9 @@
 */

 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.23"
+#define PNG_LIBPNG_VER_STRING "1.2.41beta02"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.23 - November 6, 2007\n"
+   " libpng version 1.2.41beta02 - September 30, 2009\n"

 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -385,11 +461,12 @@
 /* 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 23
+#define PNG_LIBPNG_VER_RELEASE 41
 /* 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
+#define PNG_LIBPNG_VER_BUILD  02

 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -397,7 +474,7 @@
 #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 */
@@ -406,21 +483,22 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                       PNG_LIBPNG_BUILD_PRIVATE */

-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA

 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
 * 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 10223 /* 1.2.23 */
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
+ */
+#define PNG_LIBPNG_VER 10241 /* 1.2.41 */

 #ifndef PNG_VERSION_INFO_ONLY
-/* include the compression library's header */
+/* Include the compression library's header */
 #include "zlib.h"
 #endif

-/* include all user configurable info, including optional assembler routines */
+/* Include all user configurable info, including optional assembler routines */
 #include "pngconf.h"

 /*
@@ -428,12 +506,12 @@
 /* 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)
@@ -495,14 +573,14 @@ 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.
 */
 #ifdef PNG_USE_GLOBAL_ARRAYS
 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
-  /* need room for 99.99.99beta99z */
+  /* Need room for 99.99.99beta99z */
 #else
 #define png_libpng_ver png_get_header_ver(NULL)
 #endif
@@ -621,7 +699,8 @@ 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
@@ -648,7 +727,8 @@ 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
@@ -710,7 +790,7 @@ typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
 */
 typedef struct png_info_struct
 {
-   /* the following are necessary for every PNG file */
+   /* The following are necessary for every PNG file */
   png_uint_32 width;       /* width of image in pixels (from IHDR) */
   png_uint_32 height;      /* height of image in pixels (from IHDR) */
   png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
@@ -883,8 +963,9 @@ 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
@@ -899,7 +980,7 @@ 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
@@ -1114,7 +1195,10 @@ typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
 #define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
 #define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
 #define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
-#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* WRITE only */
+#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only, deprecated */
+/* Added to libpng-1.2.34 */
+#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800  /* write only */
+#define PNG_TRANSFORM_STRIP_FILLER_AFTER  0x1000  /* write only */

 /* Flags for MNG supported features */
 #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
@@ -1184,10 +1268,12 @@ struct png_struct_def
   png_uint_32 row_number;    /* current row in interlace pass */
   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
+#ifndef PNG_NO_WRITE_FILTER
   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
   png_bytep up_row;          /* buffer to save "up" row when filtering */
   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
+#endif
   png_row_info row_info;     /* used for transformation routines */

   png_uint_32 idat_size;     /* current IDAT size for read */
@@ -1229,7 +1315,7 @@ 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
@@ -1327,7 +1413,7 @@ 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)
@@ -1335,7 +1421,7 @@ 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
@@ -1353,7 +1439,7 @@ struct png_struct_def
 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
-/* changed from png_byte to png_uint_32 at version 1.2.0 */
+/* Changed from png_byte to png_uint_32 at version 1.2.0 */
 #ifdef PNG_1_0_X
   png_byte mng_features_permitted;
 #else
@@ -1389,21 +1475,21 @@ 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 */
@@ -1416,16 +1502,23 @@ 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
+
+/* New members added in libpng-1.2.26 */
+  png_uint_32 old_big_row_buf_size, old_prev_row_size;
+
+/* New member added in libpng-1.2.30 */
+  png_charp chunkdata;  /* buffer for reading chunk data */
+
 };


 /* 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_23;
+typedef png_structp version_1_2_41beta02;

 typedef png_struct FAR * FAR * png_structpp;

@@ -1529,7 +1622,7 @@ 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
@@ -1542,11 +1635,11 @@ 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 */
@@ -1666,7 +1759,7 @@ 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

@@ -1702,74 +1795,74 @@ 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));

@@ -1797,7 +1890,7 @@ 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,
@@ -1925,6 +2018,11 @@ extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
 * If buffered output is not used, then output_flush_fn can be set to NULL.
 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
 * output_flush_fn will be ignored (and thus can be NULL).
+ * It is probably a mistake to use NULL for output_flush_fn if
+ * write_data_fn is not also NULL unless you have built libpng with
+ * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
+ * default flush function, which uses the standard *FILE structure, will
+ * be used.
 */
 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
   png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
@@ -1989,15 +2087,15 @@ 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));

-/* function that combines rows.  Not very much different than the
+/* Function that combines rows.  Not very much different than the
 * png_combine_row() call.  Is this even used?????
 */
 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
@@ -2015,7 +2113,7 @@ 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)
@@ -2032,11 +2130,12 @@ 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
@@ -2120,11 +2219,13 @@ 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
@@ -2425,8 +2526,8 @@ 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.
@@ -2437,6 +2538,10 @@ 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)
@@ -2444,14 +2549,11 @@ 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));

@@ -2477,34 +2579,90 @@ extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
 #include <crtdbg.h>
 #if (PNG_DEBUG > 1)
-#define png_debug(l,m)  _RPT0(_CRT_WARN,m)
-#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m,p1)
-#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
+#ifndef _DEBUG
+#  define _DEBUG
+#endif
+#ifndef png_debug
+#define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
+#endif
+#ifndef png_debug1
+#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
+#endif
+#ifndef png_debug2
+#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
+#endif
 #endif
 #else /* PNG_DEBUG_FILE || !_MSC_VER */
 #ifndef PNG_DEBUG_FILE
 #define PNG_DEBUG_FILE stderr
 #endif /* PNG_DEBUG_FILE */
+
 #if (PNG_DEBUG > 1)
-#define png_debug(l,m) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
-}
-#define png_debug1(l,m,p1) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
-}
-#define png_debug2(l,m,p1,p2) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
-}
+/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
+ * compilers.
+ */
+#  ifdef __STDC__
+#    ifndef png_debug
+#      define png_debug(l,m) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
+       }
+#    endif
+#    ifndef png_debug1
+#      define png_debug1(l,m,p1) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
+       }
+#    endif
+#    ifndef png_debug2
+#      define png_debug2(l,m,p1,p2) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
+       }
+#    endif
+#  else /* __STDC __ */
+#    ifndef png_debug
+#      define png_debug(l,m) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format); \
+       }
+#    endif
+#    ifndef png_debug1
+#      define png_debug1(l,m,p1) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format,p1); \
+       }
+#    endif
+#    ifndef png_debug2
+#      define png_debug2(l,m,p1,p2) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format,p1,p2); \
+       }
+#    endif
+#  endif /* __STDC __ */
 #endif /* (PNG_DEBUG > 1) */
+
 #endif /* _MSC_VER */
 #endif /* (PNG_DEBUG > 0) */
 #endif /* PNG_DEBUG */
@@ -2599,17 +2757,17 @@ extern PNG_EXPORT(void,png_set_mmx_thresholds)
 #if !defined(PNG_1_0_X)
 /* png.c, pnggccrd.c, or pngvcrd.c */
 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
+#endif /* PNG_1_0_X */
 #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));
 #endif

-#endif /* PNG_1_0_X */
-
 /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
@@ -2620,7 +2778,10 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
   png_ptr));
 #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
@@ -2649,7 +2810,7 @@ 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) +    \
@@ -2732,7 +2893,7 @@ 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
@@ -2766,7 +2927,7 @@ 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

@@ -2776,7 +2937,7 @@ 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
@@ -2818,7 +2979,7 @@ 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)) + \
@@ -2831,15 +2992,16 @@ 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. */
+/* Place to hold the signature string for a PNG file. */
 #ifdef PNG_USE_GLOBAL_ARRAYS
   PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
 #else
@@ -2958,7 +3120,8 @@ 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));
@@ -3001,8 +3164,8 @@ PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
 /* Decompress data in a chunk that uses compression */
 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
-PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
-   int comp_type, png_charp chunkdata, png_size_t chunklength,
+PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
+   int comp_type, png_size_t chunklength,
   png_size_t prefix_length, png_size_t *data_length));
 #endif

@@ -3023,10 +3186,10 @@ 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.
@@ -3178,12 +3341,12 @@ 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));
@@ -3194,12 +3357,12 @@ 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));

@@ -3210,16 +3373,16 @@ 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));
@@ -3341,7 +3504,7 @@ 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,
@@ -3440,7 +3603,7 @@ 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));

@@ -3531,6 +3694,32 @@ png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
 #endif /* PNG_pHYs_SUPPORTED */
 #endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */

+/* Read the chunk header (length + type name) */
+PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
+
+/* Added at libpng version 1.2.34 */
+#if defined(PNG_cHRM_SUPPORTED)
+PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
+   png_fixed_point int_white_x, png_fixed_point int_white_y,
+   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
+   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
+   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 PNGARG((long v1, long v2,
+   unsigned long *hi_product, unsigned long *lo_product));
+#endif
+#endif
+
+/* Added at libpng version 1.2.41 */
+PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
+   png_uint_32 width, png_uint_32 height, int bit_depth,
+   int color_type, int interlace_type, int compression_type,
+   int filter_type));
+
 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */

 #endif /* PNG_INTERNAL */
@@ -3540,5 +3729,5 @@ png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
 #endif

 #endif /* PNG_VERSION_INFO_ONLY */
-/* do not put anything past this line */
+/* Do not put anything past this line */
 #endif /* PNG_H */
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,11 +1,14 @@

 /* pngconf.h - machine configurable file for libpng
 *
- * libpng version 1.2.23 - November 6, 2007
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * libpng version 1.2.41beta02 - September 30, 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

@@ -233,6 +236,8 @@
 #  include <windows.h>
   /* Console I/O functions are not supported on WindowsCE */
 #  define PNG_NO_CONSOLE_IO
+   /* abort() may not be supported on some/all Windows CE platforms */
+#  define PNG_ABORT() exit(-1)
 #  ifdef PNG_DEBUG
 #    undef PNG_DEBUG
 #  endif
@@ -312,28 +317,38 @@
 #ifdef PNG_SETJMP_SUPPORTED
 /* This is an attempt to force a single setjmp behaviour on Linux.  If
 * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
+ *
+ * You can bypass this test if you know that your application uses exactly
+ * the same setjmp.h that was included when libpng was built.  Only define
+ * PNG_SKIP_SETJMP_CHECK while building your application, prior to the
+ * application's '#include "png.h"'. Don't define PNG_SKIP_SETJMP_CHECK
+ * while building a separate libpng library for general use.
 */

-#  ifdef __linux__
-#    ifdef _BSD_SOURCE
-#      define PNG_SAVE_BSD_SOURCE
-#      undef _BSD_SOURCE
-#    endif
-#    ifdef _SETJMP_H
-     /* If you encounter a compiler error here, see the explanation
-      * near the end of INSTALL.
-      */
-         __png.h__ already includes setjmp.h;
-         __dont__ include it again.;
-#    endif
-#  endif /* __linux__ */
+#  ifndef PNG_SKIP_SETJMP_CHECK
+#    ifdef __linux__
+#      ifdef _BSD_SOURCE
+#        define PNG_SAVE_BSD_SOURCE
+#        undef _BSD_SOURCE
+#      endif
+#      ifdef _SETJMP_H
+       /* If you encounter a compiler error here, see the explanation
+        * near the end of INSTALL.
+        */
+           __pngconf.h__ in libpng already includes setjmp.h;
+           __dont__ include it again.;
+#      endif
+#    endif /* __linux__ */
+#  endif /* PNG_SKIP_SETJMP_CHECK */

   /* include setjmp.h for error handling */
 #  include <setjmp.h>

 #  ifdef __linux__
 #    ifdef PNG_SAVE_BSD_SOURCE
-#      define _BSD_SOURCE
+#      ifndef _BSD_SOURCE
+#        define _BSD_SOURCE
+#      endif
 #      undef PNG_SAVE_BSD_SOURCE
 #    endif
 #  endif /* __linux__ */
@@ -475,7 +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)
@@ -509,6 +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
@@ -538,7 +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)
@@ -626,7 +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)
@@ -729,7 +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
 */
@@ -771,6 +787,7 @@
 #endif
 /* end of obsolete code to be removed from libpng-1.4.0 */

+/* Added at libpng-1.2.0 */
 #if !defined(PNG_1_0_X)
 #if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
 #  define PNG_USER_MEM_SUPPORTED
@@ -778,12 +795,12 @@
 #endif /* PNG_1_0_X */

 /* Added at libpng-1.2.6 */
-#if !defined(PNG_1_0_X)
-#ifndef PNG_SET_USER_LIMITS_SUPPORTED
-#if !defined(PNG_NO_SET_USER_LIMITS) && !defined(PNG_SET_USER_LIMITS_SUPPORTED)
-#  define PNG_SET_USER_LIMITS_SUPPORTED
-#endif
-#endif
+#ifndef PNG_1_0_X
+#  ifndef PNG_SET_USER_LIMITS_SUPPORTED
+#    ifndef PNG_NO_SET_USER_LIMITS
+#      define PNG_SET_USER_LIMITS_SUPPORTED
+#    endif
+#  endif
 #endif /* PNG_1_0_X */

 /* Added at libpng-1.0.16 and 1.2.6.  To accept all valid PNGS no matter
@@ -796,6 +813,11 @@
 #  define PNG_USER_HEIGHT_MAX 1000000L
 #endif

+/* Added at libpng-1.2.34 and 1.4.0 */
+#ifndef PNG_STRING_NEWLINE
+#define PNG_STRING_NEWLINE "\n"
+#endif
+
 /* These are currently experimental features, define them if you want */

 /* very little testing */
@@ -923,14 +945,22 @@
 #  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)
@@ -943,17 +973,14 @@
 #    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
+
+#ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
 #endif

-#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
-
+#ifdef PNG_WRITE_SUPPORTED
 #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED

 #ifdef PNG_NO_WRITE_TEXT
@@ -1065,17 +1092,6 @@
 #    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
@@ -1086,6 +1102,20 @@

 #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.
@@ -1121,10 +1151,10 @@ typedef unsigned char png_byte;
   change (I'm not sure if you will or not, so I thought I'd be safe) */
 #ifdef PNG_SIZE_T
   typedef PNG_SIZE_T png_size_t;
-#  define png_sizeof(x) png_convert_size(sizeof (x))
+#  define png_sizeof(x) png_convert_size(sizeof(x))
 #else
   typedef size_t png_size_t;
-#  define png_sizeof(x) sizeof (x)
+#  define png_sizeof(x) sizeof(x)
 #endif

 /* The following is needed for medium model support.  It cannot be in the
@@ -1231,7 +1261,7 @@ 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.
@@ -1304,7 +1334,7 @@ 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.
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,12 +1,15 @@

 /* pngerror.c - stub functions for i/o and memory allocation
 *
- * Last changed in libpng 1.2.22 [November 6, 2007]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 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 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
@@ -15,8 +18,8 @@

 #define PNG_INTERNAL
 #include "png.h"
-
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
 static void /* PRIVATE */
 png_default_error PNGARG((png_structp png_ptr,
  png_const_charp error_message));
@@ -44,28 +47,29 @@ png_error(png_structp png_ptr, png_const_charp error_message)
     {
       if (*error_message == '#')
       {
+           /* Strip "#nnnn " from beginning of error message. */
           int offset;
-           for (offset=1; offset<15; offset++)
-              if (*(error_message+offset) == ' ')
+           for (offset = 1; offset<15; offset++)
+              if (error_message[offset] == ' ')
                  break;
           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
           {
              int i;
-              for (i=0; i<offset-1; i++)
-                 msg[i]=error_message[i+1];
-              msg[i]='\0';
-              error_message=msg;
+              for (i = 0; i < offset - 1; i++)
+                 msg[i] = error_message[i + 1];
+              msg[i - 1] = '\0';
+              error_message = msg;
           }
           else
-              error_message+=offset;
+              error_message += offset;
       }
       else
       {
           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
           {
-              msg[0]='0';
-              msg[1]='\0';
-              error_message=msg;
+              msg[0] = '0';
+              msg[1] = '\0';
+              error_message = msg;
           }
       }
     }
@@ -110,16 +114,16 @@ png_warning(png_structp png_ptr, png_const_charp warning_message)
     {
       if (*warning_message == '#')
       {
-           for (offset=1; offset<15; offset++)
-              if (*(warning_message+offset) == ' ')
+           for (offset = 1; offset < 15; offset++)
+              if (warning_message[offset] == ' ')
                  break;
       }
     }
-     if (png_ptr != NULL && png_ptr->warning_fn != NULL)
-        (*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
   }
+   if (png_ptr != NULL && png_ptr->warning_fn != NULL)
+      (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
   else
-      png_default_warning(png_ptr, warning_message+offset);
+      png_default_warning(png_ptr, warning_message + offset);
 }
 #endif /* PNG_NO_WARNINGS */

@@ -167,8 +171,8 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
   {
      buffer[iout++] = ':';
      buffer[iout++] = ' ';
-      png_memcpy(buffer+iout, error_message, PNG_MAX_ERROR_TEXT);
-      buffer[iout+PNG_MAX_ERROR_TEXT-1] = '\0';
+      png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
+      buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
   }
 }

@@ -216,26 +220,35 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
   if (*error_message == '#')
   {
+     /* Strip "#nnnn " from beginning of error message. */
     int offset;
     char error_number[16];
-     for (offset=0; offset<15; offset++)
+     for (offset = 0; offset<15; offset++)
     {
-         error_number[offset] = *(error_message+offset+1);
-         if (*(error_message+offset) == ' ')
+         error_number[offset] = error_message[offset + 1];
+         if (error_message[offset] == ' ')
             break;
     }
-     if((offset > 1) && (offset < 15))
+     if ((offset > 1) && (offset < 15))
     {
-       error_number[offset-1]='\0';
-       fprintf(stderr, "libpng error no. %s: %s\n", error_number,
-          error_message+offset);
+       error_number[offset - 1] = '\0';
+       fprintf(stderr, "libpng error no. %s: %s",
+          error_number, error_message + offset + 1);
+       fprintf(stderr, PNG_STRING_NEWLINE);
     }
     else
-       fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
+     {
+       fprintf(stderr, "libpng error: %s, offset=%d",
+          error_message, offset);
+       fprintf(stderr, PNG_STRING_NEWLINE);
+     }
   }
   else
 #endif
-   fprintf(stderr, "libpng error: %s\n", error_message);
+   {
+      fprintf(stderr, "libpng error: %s", error_message);
+      fprintf(stderr, PNG_STRING_NEWLINE);
+   }
 #endif

 #ifdef PNG_SETJMP_SUPPORTED
@@ -255,7 +268,7 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
   PNG_ABORT();
 #endif
 #ifdef PNG_NO_CONSOLE_IO
-   error_message = error_message; /* make compiler happy */
+   error_message = error_message; /* Make compiler happy */
 #endif
 }

@@ -274,28 +287,36 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
   {
     int offset;
     char warning_number[16];
-     for (offset=0; offset<15; offset++)
+     for (offset = 0; offset < 15; offset++)
     {
-        warning_number[offset]=*(warning_message+offset+1);
-        if (*(warning_message+offset) == ' ')
+        warning_number[offset] = warning_message[offset + 1];
+        if (warning_message[offset] == ' ')
            break;
     }
-     if((offset > 1) && (offset < 15))
+     if ((offset > 1) && (offset < 15))
     {
-       warning_number[offset-1]='\0';
-       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
-          warning_message+offset);
+       warning_number[offset + 1] = '\0';
+       fprintf(stderr, "libpng warning no. %s: %s",
+          warning_number, warning_message + offset);
+       fprintf(stderr, PNG_STRING_NEWLINE);
     }
     else
-       fprintf(stderr, "libpng warning: %s\n", warning_message);
+     {
+       fprintf(stderr, "libpng warning: %s",
+          warning_message);
+       fprintf(stderr, PNG_STRING_NEWLINE);
+     }
   }
   else
 #  endif
-     fprintf(stderr, "libpng warning: %s\n", warning_message);
+   {
+     fprintf(stderr, "libpng warning: %s", warning_message);
+     fprintf(stderr, PNG_STRING_NEWLINE);
+   }
 #else
-   warning_message = warning_message; /* make compiler happy */
+   warning_message = warning_message; /* Make compiler happy */
 #endif
-   png_ptr = png_ptr; /* make compiler happy */
+   png_ptr = png_ptr; /* Make compiler happy */
 }
 #endif /* PNG_NO_WARNINGS */

@@ -333,7 +354,7 @@ png_get_error_ptr(png_structp png_ptr)
 void PNGAPI
 png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
 {
-   if(png_ptr != NULL)
+   if (png_ptr != NULL)
   {
     png_ptr->flags &=
       ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
--- a/pnggccrd.c
+++ b/pnggccrd.c
@@ -2,8 +2,10 @@

 /* This code snippet is for use by configure's compilation test. */

-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
+#if (!defined _MSC_VER) && \
+    defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
    defined(PNG_MMX_CODE_SUPPORTED)
+
 int PNGAPI png_dummy_mmx_support(void);

 static int _mmx_supported = 2; // 0: no MMX; 1: MMX supported; 2: not tested
--- a/pngget.c
+++ b/pngget.c
@@ -1,16 +1,19 @@

 /* pngget.c - retrieval of values from info struct
 *
- * Last changed in libpng 1.2.15 January 5, 2007
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.41 [September 30, 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
 #include "png.h"
-
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

 png_uint_32 PNGAPI
@@ -18,6 +21,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->valid & flag);
+
   else
      return(0);
 }
@@ -27,6 +31,7 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->rowbytes);
+
   else
      return(0);
 }
@@ -37,20 +42,20 @@ png_get_rows(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->row_pointers);
+
   else
      return(0);
 }
 #endif

 #ifdef PNG_EASY_ACCESS_SUPPORTED
-/* easy access to info, added in libpng-0.99 */
+/* Easy access to info, added in libpng-0.99 */
 png_uint_32 PNGAPI
 png_get_image_width(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
-   {
      return info_ptr->width;
-   }
+
   return (0);
 }

@@ -58,9 +63,8 @@ png_uint_32 PNGAPI
 png_get_image_height(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
-   {
      return info_ptr->height;
-   }
+
   return (0);
 }

@@ -68,9 +72,8 @@ png_byte PNGAPI
 png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
-   {
      return info_ptr->bit_depth;
-   }
+
   return (0);
 }

@@ -78,9 +81,8 @@ png_byte PNGAPI
 png_get_color_type(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
-   {
      return info_ptr->color_type;
-   }
+
   return (0);
 }

@@ -88,9 +90,8 @@ png_byte PNGAPI
 png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
-   {
      return info_ptr->filter_type;
-   }
+
   return (0);
 }

@@ -98,9 +99,8 @@ png_byte PNGAPI
 png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
-   {
      return info_ptr->interlace_type;
-   }
+
   return (0);
 }

@@ -108,9 +108,8 @@ png_byte PNGAPI
 png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
-   {
      return info_ptr->compression_type;
-   }
+
   return (0);
 }

@@ -121,10 +120,13 @@ png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_pHYs_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_pHYs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");
-      if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
+      png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter");
+
+      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
          return (0);
-      else return (info_ptr->x_pixels_per_unit);
+
+      else
+          return (info_ptr->x_pixels_per_unit);
   }
 #else
   return (0);
@@ -139,10 +141,13 @@ png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_pHYs_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_pHYs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");
-      if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
+      png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter");
+
+      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
          return (0);
-      else return (info_ptr->y_pixels_per_unit);
+
+      else
+          return (info_ptr->y_pixels_per_unit);
   }
 #else
   return (0);
@@ -157,11 +162,14 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_pHYs_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_pHYs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
-      if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
+      png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
+
+      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
         info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
          return (0);
-      else return (info_ptr->x_pixels_per_unit);
+
+      else
+          return (info_ptr->x_pixels_per_unit);
   }
 #else
   return (0);
@@ -175,9 +183,10 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
   {
   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_pHYs_SUPPORTED)
+
   if (info_ptr->valid & PNG_INFO_pHYs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
+      png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
      if (info_ptr->x_pixels_per_unit == 0)
         return ((float)0.0);
      else
@@ -185,7 +194,7 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
            /(float)info_ptr->x_pixels_per_unit));
   }
 #else
-   return (0.0);
+      return (0.0);
 #endif
   return ((float)0.0);
 }
@@ -196,15 +205,19 @@ png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_oFFs_SUPPORTED)
+
   if (info_ptr->valid & PNG_INFO_oFFs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
-      if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
+      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
          return (0);
-      else return (info_ptr->x_offset);
+
+      else
+          return (info_ptr->x_offset);
   }
 #else
-   return (0);
+      return (0);
 #endif
   return (0);
 }
@@ -213,13 +226,17 @@ png_int_32 PNGAPI
 png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
+
 #if defined(PNG_oFFs_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_oFFs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
-      if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
+      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
          return (0);
-      else return (info_ptr->y_offset);
+
+      else
+          return (info_ptr->y_offset);
   }
 #else
   return (0);
@@ -231,13 +248,17 @@ png_int_32 PNGAPI
 png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
+
 #if defined(PNG_oFFs_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_oFFs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
-      if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
+      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
          return (0);
-      else return (info_ptr->x_offset);
+
+      else
+          return (info_ptr->x_offset);
   }
 #else
   return (0);
@@ -249,13 +270,17 @@ png_int_32 PNGAPI
 png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
+
 #if defined(PNG_oFFs_SUPPORTED)
   if (info_ptr->valid & PNG_INFO_oFFs)
   {
-      png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
-      if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
+      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
+
+      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
          return (0);
-      else return (info_ptr->y_offset);
+
+      else
+          return (info_ptr->y_offset);
   }
 #else
   return (0);
@@ -308,7 +333,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
   {
-      png_debug1(1, "in %s retrieval function\n", "pHYs");
+      png_debug1(1, "in %s retrieval function", "pHYs");
      if (res_x != NULL)
      {
         *res_x = info_ptr->x_pixels_per_unit;
@@ -323,7 +348,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
      {
         *unit_type = (int)info_ptr->phys_unit_type;
         retval |= PNG_INFO_pHYs;
-         if(*unit_type == 1)
+         if (*unit_type == 1)
         {
            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
@@ -365,7 +390,7 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
      && background != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "bKGD");
+      png_debug1(1, "in %s retrieval function", "bKGD");
      *background = &(info_ptr->background);
      return (PNG_INFO_bKGD);
   }
@@ -382,7 +407,7 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
   {
-      png_debug1(1, "in %s retrieval function\n", "cHRM");
+      png_debug1(1, "in %s retrieval function", "cHRM");
      if (white_x != NULL)
         *white_x = (double)info_ptr->x_white;
      if (white_y != NULL)
@@ -413,7 +438,7 @@ png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
   {
-      png_debug1(1, "in %s retrieval function\n", "cHRM");
+      png_debug1(1, "in %s retrieval function", "cHRM");
      if (white_x != NULL)
         *white_x = info_ptr->int_x_white;
      if (white_y != NULL)
@@ -445,7 +470,7 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
      && file_gamma != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "gAMA");
+      png_debug1(1, "in %s retrieval function", "gAMA");
      *file_gamma = (double)info_ptr->gamma;
      return (PNG_INFO_gAMA);
   }
@@ -460,7 +485,7 @@ png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
      && int_file_gamma != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "gAMA");
+      png_debug1(1, "in %s retrieval function", "gAMA");
      *int_file_gamma = info_ptr->int_gamma;
      return (PNG_INFO_gAMA);
   }
@@ -476,7 +501,7 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
      && file_srgb_intent != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "sRGB");
+      png_debug1(1, "in %s retrieval function", "sRGB");
      *file_srgb_intent = (int)info_ptr->srgb_intent;
      return (PNG_INFO_sRGB);
   }
@@ -493,11 +518,12 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
      && name != NULL && profile != NULL && proflen != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "iCCP");
+      png_debug1(1, "in %s retrieval function", "iCCP");
      *name = info_ptr->iccp_name;
      *profile = info_ptr->iccp_profile;
-      /* compression_type is a dummy so the API won't have to change
-         if we introduce multiple compression types later. */
+      /* Compression_type is a dummy so the API won't have to change
+       * if we introduce multiple compression types later.
+       */
      *proflen = (int)info_ptr->iccp_proflen;
      *compression_type = (int)info_ptr->iccp_compression;
      return (PNG_INFO_iCCP);
@@ -527,7 +553,7 @@ png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
      && hist != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "hIST");
+      png_debug1(1, "in %s retrieval function", "hIST");
      *hist = info_ptr->hist;
      return (PNG_INFO_hIST);
   }
@@ -540,45 +566,57 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
   png_uint_32 *width, png_uint_32 *height, int *bit_depth,
   int *color_type, int *interlace_type, int *compression_type,
   int *filter_type)
-
 {
-   if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
-      bit_depth != NULL && color_type != NULL)
-   {
-      png_debug1(1, "in %s retrieval function\n", "IHDR");
-      *width = info_ptr->width;
-      *height = info_ptr->height;
-      *bit_depth = info_ptr->bit_depth;
-      if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16)
-        png_error(png_ptr, "Invalid bit depth");
-      *color_type = info_ptr->color_type;
-      if (info_ptr->color_type > 6)
-        png_error(png_ptr, "Invalid color type");
-      if (compression_type != NULL)
-         *compression_type = info_ptr->compression_type;
-      if (filter_type != NULL)
-         *filter_type = info_ptr->filter_type;
-      if (interlace_type != NULL)
-         *interlace_type = info_ptr->interlace_type;
+   int test_interlace_type = 0;
+   int test_compression_type = 0;
+   int test_filter_type = 0;

-      /* check for potential overflow of rowbytes */
-      if (*width == 0 || *width > PNG_UINT_31_MAX)
-        png_error(png_ptr, "Invalid image width");
-      if (*height == 0 || *height > PNG_UINT_31_MAX)
-        png_error(png_ptr, "Invalid image height");
-      if (info_ptr->width > (PNG_UINT_32_MAX
-                 >> 3)      /* 8-byte RGBA pixels */
-                 - 64       /* bigrowbuf hack */
-                 - 1        /* filter byte */
-                 - 7*8      /* rounding of width to multiple of 8 pixels */
-                 - 8)       /* extra max_pixel_depth pad */
-      {
-         png_warning(png_ptr,
-            "Width too large for libpng to process image data.");
-      }
-      return (1);
+   png_debug1(1, "in %s retrieval function", "IHDR");
+
+   if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
+       height == NULL || bit_depth == NULL || color_type == NULL)
+      return (0);
+
+#ifdef PNG_DEBUG
+   /* Test to make sure the user isn't trying to stuff height into
+    * a 16-bit int (assuming height immediately follows width).
+    */
+   *width = 0;
+   *height = PNG_UINT_31_MAX;
+   if (*width != 0)
+   {
+     png_warning(png_ptr,
+       "Application's height variable cannot hold a 32-bit value");
   }
-   return (0);
+#endif
+
+   *width = info_ptr->width;
+   *height = info_ptr->height;
+   *bit_depth = info_ptr->bit_depth;
+   *color_type = info_ptr->color_type;
+
+   if (compression_type != NULL)
+   {
+      *compression_type = info_ptr->compression_type;
+      test_compression_type = *compression_type;
+   }
+
+   if (filter_type != NULL)
+   {
+      *filter_type = info_ptr->filter_type;
+      test_filter_type = *filter_type;
+   }
+
+   if (interlace_type != NULL)
+   {
+      *interlace_type = info_ptr->interlace_type;
+      test_interlace_type = *interlace_type;
+   }
+
+   png_check_IHDR (png_ptr, *width, *height, *bit_depth, *color_type,
+      test_interlace_type, test_compression_type, test_filter_type);
+
+   return (1);
 }

 #if defined(PNG_oFFs_SUPPORTED)
@@ -589,7 +627,7 @@ png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
      && offset_x != NULL && offset_y != NULL && unit_type != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "oFFs");
+      png_debug1(1, "in %s retrieval function", "oFFs");
      *offset_x = info_ptr->x_offset;
      *offset_y = info_ptr->y_offset;
      *unit_type = (int)info_ptr->offset_unit_type;
@@ -606,10 +644,10 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
   png_charp *units, png_charpp *params)
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
-      && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
-      nparams != NULL && units != NULL && params != NULL)
+       && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
+       nparams != NULL && units != NULL && params != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "pCAL");
+      png_debug1(1, "in %s retrieval function", "pCAL");
      *purpose = info_ptr->pcal_purpose;
      *X0 = info_ptr->pcal_X0;
      *X1 = info_ptr->pcal_X1;
@@ -630,7 +668,7 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
             int *unit, double *width, double *height)
 {
    if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sCAL))
+        (info_ptr->valid & PNG_INFO_sCAL))
    {
        *unit = info_ptr->scal_unit;
        *width = info_ptr->scal_pixel_width;
@@ -646,7 +684,7 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
             int *unit, png_charpp width, png_charpp height)
 {
    if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sCAL))
+        (info_ptr->valid & PNG_INFO_sCAL))
    {
        *unit = info_ptr->scal_unit;
        *width = info_ptr->scal_s_width;
@@ -669,17 +707,20 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr != NULL && info_ptr != NULL &&
      (info_ptr->valid & PNG_INFO_pHYs))
   {
-      png_debug1(1, "in %s retrieval function\n", "pHYs");
+      png_debug1(1, "in %s retrieval function", "pHYs");
+
      if (res_x != NULL)
      {
         *res_x = info_ptr->x_pixels_per_unit;
         retval |= PNG_INFO_pHYs;
      }
+
      if (res_y != NULL)
      {
         *res_y = info_ptr->y_pixels_per_unit;
         retval |= PNG_INFO_pHYs;
      }
+
      if (unit_type != NULL)
      {
         *unit_type = (int)info_ptr->phys_unit_type;
@@ -697,10 +738,10 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
       && palette != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "PLTE");
+      png_debug1(1, "in %s retrieval function", "PLTE");
      *palette = info_ptr->palette;
      *num_palette = info_ptr->num_palette;
-      png_debug1(3, "num_palette = %d\n", *num_palette);
+      png_debug1(3, "num_palette = %d", *num_palette);
      return (PNG_INFO_PLTE);
   }
   return (0);
@@ -713,7 +754,7 @@ png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
      && sig_bit != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "sBIT");
+      png_debug1(1, "in %s retrieval function", "sBIT");
      *sig_bit = &(info_ptr->sig_bit);
      return (PNG_INFO_sBIT);
   }
@@ -728,13 +769,16 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
 {
   if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
   {
-      png_debug1(1, "in %s retrieval function\n",
+      png_debug1(1, "in %s retrieval function",
         (png_ptr->chunk_name[0] == '\0' ? "text"
             : (png_const_charp)png_ptr->chunk_name));
+
      if (text_ptr != NULL)
         *text_ptr = info_ptr->text;
+
      if (num_text != NULL)
         *num_text = info_ptr->num_text;
+
      return ((png_uint_32)info_ptr->num_text);
   }
   if (num_text != NULL)
@@ -750,7 +794,7 @@ png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
       && mod_time != NULL)
   {
-      png_debug1(1, "in %s retrieval function\n", "tIME");
+      png_debug1(1, "in %s retrieval function", "tIME");
      *mod_time = &(info_ptr->mod_time);
      return (PNG_INFO_tIME);
   }
@@ -766,7 +810,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
   png_uint_32 retval = 0;
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
   {
-      png_debug1(1, "in %s retrieval function\n", "tRNS");
+      png_debug1(1, "in %s retrieval function", "tRNS");
      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
      {
          if (trans != NULL)
@@ -774,6 +818,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
             *trans = info_ptr->trans;
             retval |= PNG_INFO_tRNS;
          }
+
          if (trans_values != NULL)
             *trans_values = &(info_ptr->trans_values);
      }
@@ -784,10 +829,11 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
             *trans_values = &(info_ptr->trans_values);
             retval |= PNG_INFO_tRNS;
          }
-          if(trans != NULL)
+
+          if (trans != NULL)
             *trans = NULL;
      }
-      if(num_trans != NULL)
+      if (num_trans != NULL)
      {
         *num_trans = info_ptr->num_trans;
         retval |= PNG_INFO_tRNS;
@@ -837,54 +883,54 @@ png_get_compression_buffer_size(png_structp png_ptr)

 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
 #ifndef PNG_1_0_X
-/* this function was added to libpng 1.2.0 and should exist by default */
+/* This function was added to libpng 1.2.0 and should exist by default */
 png_uint_32 PNGAPI
 png_get_asm_flags (png_structp png_ptr)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
    return (png_ptr? 0L: 0L);
 }

-/* this function was added to libpng 1.2.0 and should exist by default */
+/* This function was added to libpng 1.2.0 and should exist by default */
 png_uint_32 PNGAPI
 png_get_asm_flagmask (int flag_select)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
    flag_select=flag_select;
    return 0L;
 }

    /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 png_uint_32 PNGAPI
 png_get_mmx_flagmask (int flag_select, int *compilerID)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
    flag_select=flag_select;
    *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
    return 0L;
 }

-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 png_byte PNGAPI
 png_get_mmx_bitdepth_threshold (png_structp png_ptr)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
    return (png_ptr? 0: 0);
 }

-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 png_uint_32 PNGAPI
 png_get_mmx_rowbytes_threshold (png_structp png_ptr)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
    return (png_ptr? 0L: 0L);
 }
 #endif /* ?PNG_1_0_X */
 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */

 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
-/* these functions were added to libpng 1.2.6 */
+/* These functions were added to libpng 1.2.6 */
 png_uint_32 PNGAPI
 png_get_user_width_max (png_structp png_ptr)
 {
@@ -896,6 +942,6 @@ 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 */
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,12 +1,15 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * Last changed in libpng 1.2.13 November 13, 2006
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2006 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 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 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
@@ -16,12 +19,11 @@

 #define PNG_INTERNAL
 #include "png.h"
-
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

 /* Borland DOS special memory handler */
 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* if you change this, be sure to change the one in png.h also */
+/* If you change this, be sure to change the one in png.h also */

 /* Allocate memory for a png_struct.  The malloc and memset can be replaced
   by a single call to calloc() if this is thought to improve performance. */
@@ -41,14 +43,14 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
   png_voidp struct_ptr;

   if (type == PNG_STRUCT_INFO)
-     size = png_sizeof(png_info);
+      size = png_sizeof(png_info);
   else if (type == PNG_STRUCT_PNG)
-     size = png_sizeof(png_struct);
+      size = png_sizeof(png_struct);
   else
-     return (png_get_copyright(NULL));
+      return (png_get_copyright(NULL));

 #ifdef PNG_USER_MEM_SUPPORTED
-   if(malloc_fn != NULL)
+   if (malloc_fn != NULL)
   {
      png_struct dummy_struct;
      png_structp png_ptr = &dummy_struct;
@@ -57,7 +59,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
   }
   else
 #endif /* PNG_USER_MEM_SUPPORTED */
-      struct_ptr = (png_voidp)farmalloc(size);
+   struct_ptr = (png_voidp)farmalloc(size);
   if (struct_ptr != NULL)
      png_memset(struct_ptr, 0, size);
   return (struct_ptr);
@@ -80,7 +82,7 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
   if (struct_ptr != NULL)
   {
 #ifdef PNG_USER_MEM_SUPPORTED
-      if(free_fn != NULL)
+      if (free_fn != NULL)
      {
         png_struct dummy_struct;
         png_structp png_ptr = &dummy_struct;
@@ -122,10 +124,10 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
      return (NULL);

 #ifdef PNG_USER_MEM_SUPPORTED
-   if(png_ptr->malloc_fn != NULL)
-       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+   if (png_ptr->malloc_fn != NULL)
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
   else
-       ret = (png_malloc_default(png_ptr, size));
+      ret = (png_malloc_default(png_ptr, size));
   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
       png_error(png_ptr, "Out of memory!");
   return (ret);
@@ -150,12 +152,12 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 #endif

   if (size != (size_t)size)
-     ret = NULL;
+      ret = NULL;
   else if (size == (png_uint_32)65536L)
   {
      if (png_ptr->offset_table == NULL)
      {
-         /* try to see if we need to do any of this fancy stuff */
+         /* Try to see if we need to do any of this fancy stuff */
         ret = farmalloc(size);
         if (ret == NULL || ((png_size_t)ret & 0xffff))
         {
@@ -171,7 +173,7 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
               ret = NULL;
            }

-            if(png_ptr->zlib_window_bits > 14)
+            if (png_ptr->zlib_window_bits > 14)
               num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
            else
               num_blocks = 1;
@@ -210,7 +212,7 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)

            png_ptr->offset_table = table;
            png_ptr->offset_table_ptr = farmalloc(num_blocks *
-               png_sizeof (png_bytep));
+               png_sizeof(png_bytep));

            if (png_ptr->offset_table_ptr == NULL)
            {
@@ -270,9 +272,10 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
   return (ret);
 }

-/* free a pointer allocated by png_malloc().  In the default
-   configuration, png_ptr is not used, but is passed in case it
-   is needed.  If ptr is NULL, return without taking any action. */
+/* Free a pointer allocated by png_malloc().  In the default
+ * configuration, png_ptr is not used, but is passed in case it
+ * is needed.  If ptr is NULL, return without taking any action.
+ */
 void PNGAPI
 png_free(png_structp png_ptr, png_voidp ptr)
 {
@@ -285,7 +288,8 @@ png_free(png_structp png_ptr, png_voidp ptr)
      (*(png_ptr->free_fn))(png_ptr, ptr);
      return;
   }
-   else png_free_default(png_ptr, ptr);
+   else
+      png_free_default(png_ptr, ptr);
 }

 void PNGAPI
@@ -293,7 +297,8 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */

-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL || ptr == NULL)
+      return;

   if (png_ptr->offset_table != NULL)
   {
@@ -353,7 +358,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
      return (NULL);

 #ifdef PNG_USER_MEM_SUPPORTED
-   if(malloc_fn != NULL)
+   if (malloc_fn != NULL)
   {
      png_struct dummy_struct;
      png_structp png_ptr = &dummy_struct;
@@ -369,7 +374,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
   struct_ptr = (png_voidp)farmalloc(size);
 #else
 # if defined(_MSC_VER) && defined(MAXSEG_64K)
-   struct_ptr = (png_voidp)halloc(size,1);
+   struct_ptr = (png_voidp)halloc(size, 1);
 # else
   struct_ptr = (png_voidp)malloc(size);
 # endif
@@ -398,7 +403,7 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
   if (struct_ptr != NULL)
   {
 #ifdef PNG_USER_MEM_SUPPORTED
-      if(free_fn != NULL)
+      if (free_fn != NULL)
      {
         png_struct dummy_struct;
         png_structp png_ptr = &dummy_struct;
@@ -420,10 +425,12 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
 }

 /* Allocate memory.  For reasonable files, size should never exceed
-   64K.  However, zlib may allocate more then 64K if you don't tell
-   it not to.  See zconf.h and png.h for more information.  zlib does
-   need to allocate exactly 64K, so whatever you call here must
-   have the ability to do that. */
+ * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * it not to.  See zconf.h and png.h for more information.  zlib does
+ * need to allocate exactly 64K, so whatever you call here must
+ * have the ability to do that.
+ */
+

 png_voidp PNGAPI
 png_malloc(png_structp png_ptr, png_uint_32 size)
@@ -434,10 +441,10 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
   if (png_ptr == NULL || size == 0)
      return (NULL);

-   if(png_ptr->malloc_fn != NULL)
-       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+   if (png_ptr->malloc_fn != NULL)
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
   else
-       ret = (png_malloc_default(png_ptr, size));
+      ret = (png_malloc_default(png_ptr, size));
   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
       png_error(png_ptr, "Out of Memory!");
   return (ret);
@@ -456,7 +463,7 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
   if (size > (png_uint_32)65536L)
   {
 #ifndef PNG_USER_MEM_SUPPORTED
-      if(png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
         png_error(png_ptr, "Cannot Allocate > 64K");
      else
 #endif
@@ -464,23 +471,23 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
   }
 #endif

- /* Check for overflow */
+   /* Check for overflow */
 #if defined(__TURBOC__) && !defined(__FLAT__)
- if (size != (unsigned long)size)
-   ret = NULL;
- else
-   ret = farmalloc(size);
+   if (size != (unsigned long)size)
+      ret = NULL;
+   else
+      ret = farmalloc(size);
 #else
 # if defined(_MSC_VER) && defined(MAXSEG_64K)
- if (size != (unsigned long)size)
-   ret = NULL;
- else
-   ret = halloc(size, 1);
+   if (size != (unsigned long)size)
+      ret = NULL;
+   else
+      ret = halloc(size, 1);
 # else
- if (size != (size_t)size)
-   ret = NULL;
- else
-   ret = malloc((size_t)size);
+   if (size != (size_t)size)
+      ret = NULL;
+   else
+      ret = malloc((size_t)size);
 # endif
 #endif

@@ -493,7 +500,8 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 }

 /* Free a pointer allocated by png_malloc().  If ptr is NULL, return
-   without taking any action. */
+ * without taking any action.
+ */
 void PNGAPI
 png_free(png_structp png_ptr, png_voidp ptr)
 {
@@ -506,7 +514,8 @@ png_free(png_structp png_ptr, png_voidp ptr)
      (*(png_ptr->free_fn))(png_ptr, ptr);
      return;
   }
-   else png_free_default(png_ptr, ptr);
+   else
+      png_free_default(png_ptr, ptr);
 }
 void PNGAPI
 png_free_default(png_structp png_ptr, png_voidp ptr)
@@ -542,9 +551,10 @@ png_malloc_warn(png_structp png_ptr, png_uint_32 size)
 {
   png_voidp ptr;
   png_uint_32 save_flags;
-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);

-   save_flags=png_ptr->flags;
+   save_flags = png_ptr->flags;
   png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
   ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
   png_ptr->flags=save_flags;
@@ -560,7 +570,7 @@ png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,

   size = (png_size_t)length;
   if ((png_uint_32)size != length)
-      png_error(png_ptr,"Overflow in png_memcpy_check.");
+      png_error(png_ptr, "Overflow in png_memcpy_check.");

   return(png_memcpy (s1, s2, size));
 }
@@ -573,7 +583,7 @@ png_memset_check (png_structp png_ptr, png_voidp s1, int value,

   size = (png_size_t)length;
   if ((png_uint_32)size != length)
-      png_error(png_ptr,"Overflow in png_memset_check.");
+      png_error(png_ptr, "Overflow in png_memset_check.");

   return (png_memset (s1, value, size));

@@ -587,10 +597,11 @@ void PNGAPI
 png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
  malloc_fn, png_free_ptr free_fn)
 {
-   if(png_ptr != NULL) {
-   png_ptr->mem_ptr = mem_ptr;
-   png_ptr->malloc_fn = malloc_fn;
-   png_ptr->free_fn = free_fn;
+   if (png_ptr != NULL)
+   {
+      png_ptr->mem_ptr = mem_ptr;
+      png_ptr->malloc_fn = malloc_fn;
+      png_ptr->free_fn = free_fn;
   }
 }

@@ -601,7 +612,8 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
 png_voidp PNGAPI
 png_get_mem_ptr(png_structp png_ptr)
 {
-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
   return ((png_voidp)png_ptr->mem_ptr);
 }
 #endif /* PNG_USER_MEM_SUPPORTED */
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,19 +1,21 @@

 /* pngpread.c - read a png file in push mode
 *
- * Last changed in libpng 1.2.22 [November 6, 2007]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * 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
 #include "png.h"
-
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED

-/* push model modes */
+/* Push model modes */
 #define PNG_READ_SIG_MODE   0
 #define PNG_READ_CHUNK_MODE 1
 #define PNG_READ_IDAT_MODE  2
@@ -28,7 +30,9 @@ void PNGAPI
 png_process_data(png_structp png_ptr, png_infop info_ptr,
   png_bytep buffer, png_size_t buffer_size)
 {
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
   png_push_restore_buffer(png_ptr, buffer, buffer_size);

   while (png_ptr->buffer_size)
@@ -43,7 +47,9 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
 void /* PRIVATE */
 png_process_some_data(png_structp png_ptr, png_infop info_ptr)
 {
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
   switch (png_ptr->process_mode)
   {
      case PNG_READ_SIG_MODE:
@@ -51,22 +57,26 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
         png_push_read_sig(png_ptr, info_ptr);
         break;
      }
+
      case PNG_READ_CHUNK_MODE:
      {
         png_push_read_chunk(png_ptr, info_ptr);
         break;
      }
+
      case PNG_READ_IDAT_MODE:
      {
         png_push_read_IDAT(png_ptr);
         break;
      }
+
 #if defined(PNG_READ_tEXt_SUPPORTED)
      case PNG_READ_tEXt_MODE:
      {
         png_push_read_tEXt(png_ptr, info_ptr);
         break;
      }
+
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
      case PNG_READ_zTXt_MODE:
@@ -74,6 +84,7 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
         png_push_read_zTXt(png_ptr, info_ptr);
         break;
      }
+
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
      case PNG_READ_iTXt_MODE:
@@ -81,12 +92,14 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
         png_push_read_iTXt(png_ptr, info_ptr);
         break;
      }
+
 #endif
      case PNG_SKIP_MODE:
      {
         png_push_crc_finish(png_ptr);
         break;
      }
+
      default:
      {
         png_ptr->buffer_size = 0;
@@ -114,7 +127,7 @@ png_push_read_sig(png_structp png_ptr, png_infop info_ptr)

   png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
      num_to_check);
-   png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes+num_to_check);
+   png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);

   if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
   {
@@ -210,25 +223,31 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
      }

      png_push_fill_buffer(png_ptr, chunk_length, 4);
-      png_ptr->push_length = png_get_uint_31(png_ptr,chunk_length);
+      png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
      png_reset_crc(png_ptr);
      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+      png_check_chunk_name(png_ptr, png_ptr->chunk_name);
      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
   }

   if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
-     if(png_ptr->mode & PNG_AFTER_IDAT)
+     if (png_ptr->mode & PNG_AFTER_IDAT)
        png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;

   if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
   {
+      if (png_ptr->push_length != 13)
+         png_error(png_ptr, "Invalid IHDR length");
+
      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
      {
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
   }
+
   else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
   {
      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
@@ -236,11 +255,13 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);

      png_ptr->process_mode = PNG_READ_DONE_MODE;
      png_push_have_end(png_ptr, info_ptr);
   }
+
 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
   else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
   {
@@ -249,20 +270,26 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
         png_ptr->mode |= PNG_HAVE_IDAT;
+
      png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
+
      if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
         png_ptr->mode |= PNG_HAVE_PLTE;
+
      else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
      {
         if (!(png_ptr->mode & PNG_HAVE_IHDR))
            png_error(png_ptr, "Missing IHDR before IDAT");
+
         else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
                  !(png_ptr->mode & PNG_HAVE_PLTE))
            png_error(png_ptr, "Missing PLTE before IDAT");
      }
   }
+
 #endif
   else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
   {
@@ -273,23 +300,26 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
      }
      png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
   }
+
   else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
   {
      /* If we reach an IDAT chunk, this means we have read all of the
       * header chunks, and we can start reading the image (or if this
       * is called after the image has been read - we have an error).
       */
-     if (!(png_ptr->mode & PNG_HAVE_IHDR))
-       png_error(png_ptr, "Missing IHDR before IDAT");
-     else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-         !(png_ptr->mode & PNG_HAVE_PLTE))
-       png_error(png_ptr, "Missing PLTE before IDAT");
+
+      if (!(png_ptr->mode & PNG_HAVE_IHDR))
+         png_error(png_ptr, "Missing IHDR before IDAT");
+
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+          !(png_ptr->mode & PNG_HAVE_PLTE))
+         png_error(png_ptr, "Missing PLTE before IDAT");

      if (png_ptr->mode & PNG_HAVE_IDAT)
      {
         if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
-           if (png_ptr->push_length == 0)
-              return;
+            if (png_ptr->push_length == 0)
+               return;

         if (png_ptr->mode & PNG_AFTER_IDAT)
            png_error(png_ptr, "Too many IDAT's found");
@@ -303,6 +333,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
      png_ptr->zstream.next_out = png_ptr->row_buf;
      return;
   }
+
 #if defined(PNG_READ_gAMA_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
   {
@@ -311,8 +342,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
@@ -322,8 +355,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_cHRM_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
@@ -333,8 +368,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
@@ -344,8 +381,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_iCCP_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
@@ -355,8 +394,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
@@ -366,8 +407,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
@@ -377,8 +420,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_bKGD_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
@@ -388,8 +433,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
@@ -399,8 +446,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
@@ -410,8 +459,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
@@ -421,9 +472,11 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
   }
 #endif
+
 #if defined(PNG_READ_pCAL_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
   {
@@ -432,8 +485,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_sCAL_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
@@ -443,8 +498,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_tIME_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
@@ -454,8 +511,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
@@ -465,8 +524,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
@@ -476,8 +537,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
   else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
@@ -487,8 +550,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
         png_push_save_buffer(png_ptr);
         return;
      }
+
      png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
   }
+
 #endif
   else
   {
@@ -563,7 +628,9 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
 {
   png_bytep ptr;

-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
   ptr = buffer;
   if (png_ptr->save_buffer_size)
   {
@@ -587,6 +654,7 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)

      if (length < png_ptr->current_buffer_size)
         save_size = length;
+
      else
         save_size = png_ptr->current_buffer_size;

@@ -604,7 +672,7 @@ png_push_save_buffer(png_structp png_ptr)
   {
      if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
      {
-         png_size_t i,istop;
+         png_size_t i, istop;
         png_bytep sp;
         png_bytep dp;

@@ -627,6 +695,7 @@ png_push_save_buffer(png_structp png_ptr)
      {
        png_error(png_ptr, "Potential overflow of save_buffer");
      }
+
      new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
      old_buffer = png_ptr->save_buffer;
      png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
@@ -673,7 +742,7 @@ png_push_read_IDAT(png_structp png_ptr)
      }

      png_push_fill_buffer(png_ptr, chunk_length, 4);
-      png_ptr->push_length = png_get_uint_31(png_ptr,chunk_length);
+      png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
      png_reset_crc(png_ptr);
      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
@@ -695,16 +764,19 @@ png_push_read_IDAT(png_structp png_ptr)
      if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
      {
         save_size = (png_size_t)png_ptr->idat_size;
-         /* check for overflow */
-         if((png_uint_32)save_size != png_ptr->idat_size)
+
+         /* Check for overflow */
+         if ((png_uint_32)save_size != png_ptr->idat_size)
            png_error(png_ptr, "save_size overflowed in pngpread");
      }
      else
         save_size = png_ptr->save_buffer_size;

      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
+
      if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
         png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
+
      png_ptr->idat_size -= save_size;
      png_ptr->buffer_size -= save_size;
      png_ptr->save_buffer_size -= save_size;
@@ -717,8 +789,9 @@ png_push_read_IDAT(png_structp png_ptr)
      if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
      {
         save_size = (png_size_t)png_ptr->idat_size;
-         /* check for overflow */
-         if((png_uint_32)save_size != png_ptr->idat_size)
+
+         /* Check for overflow */
+         if ((png_uint_32)save_size != png_ptr->idat_size)
            png_error(png_ptr, "save_size overflowed in pngpread");
      }
      else
@@ -758,7 +831,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,

   png_ptr->zstream.next_in = buffer;
   png_ptr->zstream.avail_in = (uInt)buffer_length;
-   for(;;)
+   for (;;)
   {
      ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
      if (ret != Z_OK)
@@ -767,6 +840,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
         {
            if (png_ptr->zstream.avail_in)
               png_error(png_ptr, "Extra compressed data");
+
            if (!(png_ptr->zstream.avail_out))
            {
               png_push_process_row(png_ptr);
@@ -778,6 +852,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
         }
         else if (ret == Z_BUF_ERROR)
            break;
+
         else
            png_error(png_ptr, "Decompression Error");
      }
@@ -799,6 +874,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
         png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
         png_ptr->zstream.next_out = png_ptr->row_buf;
      }
+
      else
         break;
   }
@@ -827,7 +903,7 @@ png_push_process_row(png_structp png_ptr)
      png_do_read_transformations(png_ptr);

 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-   /* blow up interlaced rows to full size */
+   /* Blow up interlaced rows to full size */
   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
   {
      if (png_ptr->pass < 6)
@@ -845,9 +921,10 @@ png_push_process_row(png_structp png_ptr)
            for (i = 0; i < 8 && png_ptr->pass == 0; i++)
            {
               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
+               png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */
            }
-            if (png_ptr->pass == 2) /* pass 1 might be empty */
+
+            if (png_ptr->pass == 2) /* Pass 1 might be empty */
            {
               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
               {
@@ -855,6 +932,7 @@ png_push_process_row(png_structp png_ptr)
                  png_read_push_finish_row(png_ptr);
               }
            }
+
            if (png_ptr->pass == 4 && png_ptr->height <= 4)
            {
               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
@@ -863,13 +941,16 @@ png_push_process_row(png_structp png_ptr)
                  png_read_push_finish_row(png_ptr);
               }
            }
+
            if (png_ptr->pass == 6 && png_ptr->height <= 4)
            {
                png_push_have_row(png_ptr, png_bytep_NULL);
                png_read_push_finish_row(png_ptr);
            }
+
            break;
         }
+
         case 1:
         {
            int i;
@@ -878,7 +959,8 @@ png_push_process_row(png_structp png_ptr)
               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
               png_read_push_finish_row(png_ptr);
            }
-            if (png_ptr->pass == 2) /* skip top 4 generated rows */
+
+            if (png_ptr->pass == 2) /* Skip top 4 generated rows */
            {
               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
               {
@@ -886,22 +968,27 @@ png_push_process_row(png_structp png_ptr)
                  png_read_push_finish_row(png_ptr);
               }
            }
+
            break;
         }
+
         case 2:
         {
            int i;
+
            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
            {
               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
               png_read_push_finish_row(png_ptr);
            }
+
            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
            {
               png_push_have_row(png_ptr, png_bytep_NULL);
               png_read_push_finish_row(png_ptr);
            }
-            if (png_ptr->pass == 4) /* pass 3 might be empty */
+
+            if (png_ptr->pass == 4) /* Pass 3 might be empty */
            {
               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
               {
@@ -909,17 +996,21 @@ png_push_process_row(png_structp png_ptr)
                  png_read_push_finish_row(png_ptr);
               }
            }
+
            break;
         }
+
         case 3:
         {
            int i;
+
            for (i = 0; i < 4 && png_ptr->pass == 3; i++)
            {
               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
               png_read_push_finish_row(png_ptr);
            }
-            if (png_ptr->pass == 4) /* skip top two generated rows */
+
+            if (png_ptr->pass == 4) /* Skip top two generated rows */
            {
               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
               {
@@ -927,49 +1018,61 @@ png_push_process_row(png_structp png_ptr)
                  png_read_push_finish_row(png_ptr);
               }
            }
+
            break;
         }
+
         case 4:
         {
            int i;
+
            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
            {
               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
               png_read_push_finish_row(png_ptr);
            }
+
            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
            {
               png_push_have_row(png_ptr, png_bytep_NULL);
               png_read_push_finish_row(png_ptr);
            }
-            if (png_ptr->pass == 6) /* pass 5 might be empty */
+
+            if (png_ptr->pass == 6) /* Pass 5 might be empty */
            {
               png_push_have_row(png_ptr, png_bytep_NULL);
               png_read_push_finish_row(png_ptr);
            }
+
            break;
         }
+
         case 5:
         {
            int i;
+
            for (i = 0; i < 2 && png_ptr->pass == 5; i++)
            {
               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
               png_read_push_finish_row(png_ptr);
            }
-            if (png_ptr->pass == 6) /* skip top generated row */
+
+            if (png_ptr->pass == 6) /* Skip top generated row */
            {
               png_push_have_row(png_ptr, png_bytep_NULL);
               png_read_push_finish_row(png_ptr);
            }
+
            break;
         }
         case 6:
         {
            png_push_have_row(png_ptr, png_ptr->row_buf + 1);
            png_read_push_finish_row(png_ptr);
+
            if (png_ptr->pass != 6)
               break;
+
            png_push_have_row(png_ptr, png_bytep_NULL);
            png_read_push_finish_row(png_ptr);
         }
@@ -987,18 +1090,18 @@ void /* PRIVATE */
 png_read_push_finish_row(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-   /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */

-   /* start of interlace block */
+   /* Start of interlace block */
   PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};

-   /* offset to next interlace block */
+   /* Offset to next interlace block */
   PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};

-   /* start of interlace block in the y direction */
+   /* Start of interlace block in the y direction */
   PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};

-   /* offset to next interlace block in the y direction */
+   /* Offset to next interlace block in the y direction */
   PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};

   /* Height of interlace block.  This is not currently used - if you need
@@ -1011,6 +1114,7 @@ png_read_push_finish_row(png_structp png_ptr)
   if (png_ptr->row_number < png_ptr->num_rows)
      return;

+#if defined(PNG_READ_INTERLACING_SUPPORTED)
   if (png_ptr->interlaced)
   {
      png_ptr->row_number = 0;
@@ -1026,6 +1130,7 @@ png_read_push_finish_row(png_structp png_ptr)

         if (png_ptr->pass > 7)
            png_ptr->pass--;
+
         if (png_ptr->pass >= 7)
            break;

@@ -1047,6 +1152,7 @@ png_read_push_finish_row(png_structp png_ptr)

      } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
   }
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
 }

 #if defined(PNG_READ_tEXt_SUPPORTED)
@@ -1057,7 +1163,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
      {
         png_error(png_ptr, "Out of place tEXt");
-         info_ptr = info_ptr; /* to quiet some compiler warnings */
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
      }

 #ifdef PNG_MAX_MALLOC_64K
@@ -1072,7 +1178,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
 #endif

   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
-         (png_uint_32)(length+1));
+      (png_uint_32)(length + 1));
   png_ptr->current_text[length] = '\0';
   png_ptr->current_text_ptr = png_ptr->current_text;
   png_ptr->current_text_size = (png_size_t)length;
@@ -1089,8 +1195,10 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)

      if (png_ptr->buffer_size < png_ptr->current_text_left)
         text_size = png_ptr->buffer_size;
+
      else
         text_size = png_ptr->current_text_left;
+
      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
      png_ptr->current_text_left -= text_size;
      png_ptr->current_text_ptr += text_size;
@@ -1118,7 +1226,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
      key = png_ptr->current_text;

      for (text = key; *text; text++)
-         /* empty loop */ ;
+         /* Empty loop */ ;

      if (text < key + png_ptr->current_text_size)
         text++;
@@ -1153,7 +1261,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
      {
         png_error(png_ptr, "Out of place zTXt");
-         info_ptr = info_ptr; /* to quiet some compiler warnings */
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
      }

 #ifdef PNG_MAX_MALLOC_64K
@@ -1170,7 +1278,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
 #endif

   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
-       (png_uint_32)(length+1));
+      (png_uint_32)(length + 1));
   png_ptr->current_text[length] = '\0';
   png_ptr->current_text_ptr = png_ptr->current_text;
   png_ptr->current_text_size = (png_size_t)length;
@@ -1187,8 +1295,10 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)

      if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
         text_size = png_ptr->buffer_size;
+
      else
         text_size = png_ptr->current_text_left;
+
      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
      png_ptr->current_text_left -= text_size;
      png_ptr->current_text_ptr += text_size;
@@ -1212,7 +1322,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
      key = png_ptr->current_text;

      for (text = key; *text; text++)
-         /* empty loop */ ;
+         /* Empty loop */ ;

      /* zTXt can't have zero text */
      if (text >= key + png_ptr->current_text_size)
@@ -1224,7 +1334,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)

      text++;

-      if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
+      if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */
      {
         png_ptr->current_text = NULL;
         png_free(png_ptr, key);
@@ -1261,13 +1371,17 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
            if (text == NULL)
            {
               text = (png_charp)png_malloc(png_ptr,
-                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
-                     + key_size + 1));
+                     (png_uint_32)(png_ptr->zbuf_size
+                     - png_ptr->zstream.avail_out + key_size + 1));
+
               png_memcpy(text + key_size, png_ptr->zbuf,
                  png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+
               png_memcpy(text, key, key_size);
+
               text_size = key_size + png_ptr->zbuf_size -
                  png_ptr->zstream.avail_out;
+
               *(text + text_size) = '\0';
            }
            else
@@ -1276,12 +1390,15 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)

               tmp = text;
               text = (png_charp)png_malloc(png_ptr, text_size +
-                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
-                   + 1));
+                  (png_uint_32)(png_ptr->zbuf_size 
+                  - png_ptr->zstream.avail_out + 1));
+
               png_memcpy(text, tmp, text_size);
               png_free(png_ptr, tmp);
+
               png_memcpy(text + text_size, png_ptr->zbuf,
                  png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+
               text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
               *(text + text_size) = '\0';
            }
@@ -1345,7 +1462,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
      {
         png_error(png_ptr, "Out of place iTXt");
-         info_ptr = info_ptr; /* to quiet some compiler warnings */
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
      }

 #ifdef PNG_MAX_MALLOC_64K
@@ -1360,7 +1477,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
 #endif

   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
-         (png_uint_32)(length+1));
+      (png_uint_32)(length + 1));
   png_ptr->current_text[length] = '\0';
   png_ptr->current_text_ptr = png_ptr->current_text;
   png_ptr->current_text_size = (png_size_t)length;
@@ -1378,8 +1495,10 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)

      if (png_ptr->buffer_size < png_ptr->current_text_left)
         text_size = png_ptr->buffer_size;
+
      else
         text_size = png_ptr->current_text_left;
+
      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
      png_ptr->current_text_left -= text_size;
      png_ptr->current_text_ptr += text_size;
@@ -1410,23 +1529,25 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
      key = png_ptr->current_text;

      for (lang = key; *lang; lang++)
-         /* empty loop */ ;
+         /* Empty loop */ ;

      if (lang < key + png_ptr->current_text_size - 3)
         lang++;

      comp_flag = *lang++;
-      lang++;     /* skip comp_type, always zero */
+      lang++;     /* Skip comp_type, always zero */

      for (lang_key = lang; *lang_key; lang_key++)
-         /* empty loop */ ;
-      lang_key++;        /* skip NUL separator */
+         /* Empty loop */ ;
+
+      lang_key++;        /* Skip NUL separator */

      text=lang_key;
+
      if (lang_key < key + png_ptr->current_text_size - 1)
      {
        for (; *text; text++)
-           /* empty loop */ ;
+           /* Empty loop */ ;
      }

      if (text < key + png_ptr->current_text_size)
@@ -1434,6 +1555,7 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)

      text_ptr = (png_textp)png_malloc(png_ptr,
         (png_uint_32)png_sizeof(png_text));
+
      text_ptr->compression = comp_flag + 2;
      text_ptr->key = key;
      text_ptr->lang = lang;
@@ -1461,22 +1583,21 @@ void /* PRIVATE */
 png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
   length)
 {
-   png_uint_32 skip=0;
-   png_check_chunk_name(png_ptr, png_ptr->chunk_name);
+   png_uint_32 skip = 0;

   if (!(png_ptr->chunk_name[0] & 0x20))
   {
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-     if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
-          PNG_HANDLE_CHUNK_ALWAYS
+      if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+         PNG_HANDLE_CHUNK_ALWAYS
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-          && png_ptr->read_user_chunk_fn == NULL
+         && png_ptr->read_user_chunk_fn == NULL
 #endif
-        )
+         )
 #endif
-        png_chunk_error(png_ptr, "unknown critical chunk");
+         png_chunk_error(png_ptr, "unknown critical chunk");

-     info_ptr = info_ptr; /* to quiet some compiler warnings */
+      info_ptr = info_ptr; /* To quiet some compiler warnings */
   }

 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
@@ -1493,36 +1614,50 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
      png_memcpy((png_charp)png_ptr->unknown_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.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
+        = '\0';

-      png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
      png_ptr->unknown_chunk.size = (png_size_t)length;
-      png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
-#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-      if(png_ptr->read_user_chunk_fn != NULL)
+
+      if (length == 0)
+         png_ptr->unknown_chunk.data = NULL;
+
+      else
      {
-         /* callback to user unknown chunk handler */
+         png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
+       (png_uint_32)length);
+         png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
+      }
+
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+      if (png_ptr->read_user_chunk_fn != NULL)
+      {
+         /* Callback to user unknown chunk handler */
         int ret;
         ret = (*(png_ptr->read_user_chunk_fn))
           (png_ptr, &png_ptr->unknown_chunk);
+
         if (ret < 0)
            png_chunk_error(png_ptr, "error in user chunk");
+
         if (ret == 0)
         {
            if (!(png_ptr->chunk_name[0] & 0x20))
-               if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+               if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
                    PNG_HANDLE_CHUNK_ALWAYS)
                  png_chunk_error(png_ptr, "unknown critical chunk");
            png_set_unknown_chunks(png_ptr, info_ptr,
               &png_ptr->unknown_chunk, 1);
         }
      }
-#else
-      png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+
+      else
 #endif
+        png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
      png_free(png_ptr, png_ptr->unknown_chunk.data);
      png_ptr->unknown_chunk.data = NULL;
   }
+
   else
 #endif
      skip=length;
@@ -1559,7 +1694,9 @@ png_progressive_combine_row (png_structp png_ptr,
   PNG_CONST int FARDATA png_pass_dsp_mask[7] =
      {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 #endif
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
   if (new_row != NULL)    /* new_row must == png_ptr->row_buf here. */
      png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
 }
@@ -1569,7 +1706,9 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
   png_progressive_end_ptr end_fn)
 {
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
   png_ptr->info_fn = info_fn;
   png_ptr->row_fn = row_fn;
   png_ptr->end_fn = end_fn;
@@ -1580,7 +1719,9 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
 png_voidp PNGAPI
 png_get_progressive_ptr(png_structp png_ptr)
 {
-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
+
   return png_ptr->io_ptr;
 }
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
--- a/pngread.c
+++ b/pngread.c
@@ -1,19 +1,21 @@

 /* pngread.c - read a PNG file
 *
- * Last changed in libpng 1.2.20 September 7, 2007
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 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 an application calls directly to
 * read a PNG file or stream.
 */

 #define PNG_INTERNAL
 #include "png.h"
-
 #if defined(PNG_READ_SUPPORTED)

 /* Create a PNG structure for reading, and allocate any memory needed. */
@@ -35,6 +37,9 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 {
 #endif /* PNG_USER_MEM_SUPPORTED */

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

 #ifdef PNG_SETJMP_SUPPORTED
@@ -45,7 +50,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,

   int i;

-   png_debug(1, "in png_create_read_struct\n");
+   png_debug(1, "in png_create_read_struct");
 #ifdef PNG_USER_MEM_SUPPORTED
   png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
@@ -55,7 +60,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
   if (png_ptr == NULL)
      return (NULL);

-   /* added at libpng-1.2.6 */
+   /* 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;
@@ -69,7 +74,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif
   {
      png_free(png_ptr, png_ptr->zbuf);
-      png_ptr->zbuf=NULL;
+      png_ptr->zbuf = NULL;
 #ifdef PNG_USER_MEM_SUPPORTED
      png_destroy_struct_2((png_voidp)png_ptr,
         (png_free_ptr)free_fn, (png_voidp)mem_ptr);
@@ -79,7 +84,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
      return (NULL);
   }
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
+   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
 #endif
 #endif

@@ -89,12 +94,18 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,

   png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);

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

   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
   {
@@ -122,14 +133,14 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
        png_warning(png_ptr, msg);
 #endif
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-        png_ptr->flags=0;
+        png_ptr->flags = 0;
 #endif
        png_error(png_ptr,
           "Incompatible libpng version in application and library");
     }
   }

-   /* initialize zbuf - compression buffer */
+   /* 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);
@@ -158,7 +169,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #ifdef USE_FAR_KEYWORD
   if (setjmp(jmpbuf))
      PNG_ABORT();
-   png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
+   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
 #else
   if (setjmp(png_ptr->jmpbuf))
      PNG_ABORT();
@@ -184,13 +195,14 @@ png_read_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 (png_ptr == NULL)
+      return;
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
-   if(png_sizeof(png_struct) > png_struct_size ||
+   if (png_sizeof(png_struct) > png_struct_size ||
      png_sizeof(png_info) > png_info_size)
   {
      char msg[80];
-      png_ptr->warning_fn=NULL;
+      png_ptr->warning_fn = NULL;
      if (user_png_ver)
      {
        png_snprintf(msg, 80,
@@ -204,20 +216,20 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
      png_warning(png_ptr, msg);
   }
 #endif
-   if(png_sizeof(png_struct) > png_struct_size)
+   if (png_sizeof(png_struct) > png_struct_size)
     {
-       png_ptr->error_fn=NULL;
+       png_ptr->error_fn = NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-       png_ptr->flags=0;
+       png_ptr->flags = 0;
 #endif
       png_error(png_ptr,
       "The png struct allocated by the application for reading is too small.");
     }
-   if(png_sizeof(png_info) > png_info_size)
+   if (png_sizeof(png_info) > png_info_size)
     {
-       png_ptr->error_fn=NULL;
+       png_ptr->error_fn = NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-       png_ptr->flags=0;
+       png_ptr->flags = 0;
 #endif
       png_error(png_ptr,
         "The info struct allocated by application for reading is too small.");
@@ -234,20 +246,21 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
   jmp_buf tmp_jmp;  /* to save current jump buffer */
 #endif

-   int i=0;
+   int i = 0;

   png_structp png_ptr=*ptr_ptr;

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

   do
   {
-     if(user_png_ver[i] != png_libpng_ver[i])
+     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_ptr->warning_fn = NULL;
       png_warning(png_ptr,
        "Application uses deprecated png_read_init() and should be recompiled.");
       break;
@@ -255,35 +268,35 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
     }
   } while (png_libpng_ver[i++]);

-   png_debug(1, "in png_read_init_3\n");
+   png_debug(1, "in png_read_init_3");

 #ifdef PNG_SETJMP_SUPPORTED
-   /* save jump buffer and error functions */
-   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+   /* Save jump buffer and error functions */
+   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);
-       *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
-       png_ptr = *ptr_ptr;
-     }
+   if (png_sizeof(png_struct) > png_struct_size)
+   {
+      png_destroy_struct(png_ptr);
+      *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+      png_ptr = *ptr_ptr;
+   }

-   /* reset all variables to 0 */
-   png_memset(png_ptr, 0, png_sizeof (png_struct));
+   /* Reset all variables to 0 */
+   png_memset(png_ptr, 0, png_sizeof(png_struct));

 #ifdef PNG_SETJMP_SUPPORTED
-   /* restore jump buffer */
-   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+   /* Restore jump buffer */
+   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
 #endif

-   /* added at libpng-1.2.6 */
+   /* 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

-   /* initialize zbuf - compression buffer */
+   /* 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);
@@ -318,8 +331,9 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 void PNGAPI
 png_read_info(png_structp png_ptr, png_infop info_ptr)
 {
-   if(png_ptr == NULL) return;
-   png_debug(1, "in png_read_info\n");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+   png_debug(1, "in png_read_info");
   /* If we haven't checked all of the PNG signature bytes, do so now. */
   if (png_ptr->sig_bytes < 8)
   {
@@ -341,7 +355,7 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
         png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
   }

-   for(;;)
+   for (;;)
   {
 #ifdef PNG_USE_LOCAL_ARRAYS
      PNG_CONST PNG_IHDR;
@@ -400,38 +414,29 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
      PNG_CONST PNG_zTXt;
 #endif
 #endif /* PNG_USE_LOCAL_ARRAYS */
-      png_byte chunk_length[4];
-      png_uint_32 length;
-
-      png_read_data(png_ptr, chunk_length, 4);
-      length = png_get_uint_31(png_ptr,chunk_length);
-
-      png_reset_crc(png_ptr);
-      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-
-      png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
-         length);
+      png_uint_32 length = png_read_chunk_header(png_ptr);
+      PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;

      /* This should be a binary subdivision search or a hash for
       * matching the chunk name rather than a linear search.
       */
-      if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
-        if(png_ptr->mode & PNG_AFTER_IDAT)
+      if (!png_memcmp(chunk_name, png_IDAT, 4))
+        if (png_ptr->mode & PNG_AFTER_IDAT)
          png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;

-      if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
+      if (!png_memcmp(chunk_name, png_IHDR, 4))
         png_handle_IHDR(png_ptr, info_ptr, length);
-      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+      else if (!png_memcmp(chunk_name, png_IEND, 4))
         png_handle_IEND(png_ptr, info_ptr, length);
 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-      else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+      else if (png_handle_as_unknown(png_ptr, chunk_name))
      {
-         if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         if (!png_memcmp(chunk_name, png_IDAT, 4))
            png_ptr->mode |= PNG_HAVE_IDAT;
         png_handle_unknown(png_ptr, info_ptr, length);
-         if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+         if (!png_memcmp(chunk_name, png_PLTE, 4))
            png_ptr->mode |= PNG_HAVE_PLTE;
-         else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         else if (!png_memcmp(chunk_name, png_IDAT, 4))
         {
            if (!(png_ptr->mode & PNG_HAVE_IHDR))
               png_error(png_ptr, "Missing IHDR before IDAT");
@@ -442,9 +447,9 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
         }
      }
 #endif
-      else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+      else if (!png_memcmp(chunk_name, png_PLTE, 4))
         png_handle_PLTE(png_ptr, info_ptr, length);
-      else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+      else if (!png_memcmp(chunk_name, png_IDAT, 4))
      {
         if (!(png_ptr->mode & PNG_HAVE_IHDR))
            png_error(png_ptr, "Missing IHDR before IDAT");
@@ -457,71 +462,71 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
         break;
      }
 #if defined(PNG_READ_bKGD_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
+      else if (!png_memcmp(chunk_name, png_bKGD, 4))
         png_handle_bKGD(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_cHRM_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
+      else if (!png_memcmp(chunk_name, png_cHRM, 4))
         png_handle_cHRM(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_gAMA_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
+      else if (!png_memcmp(chunk_name, png_gAMA, 4))
         png_handle_gAMA(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
+      else if (!png_memcmp(chunk_name, png_hIST, 4))
         png_handle_hIST(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
+      else if (!png_memcmp(chunk_name, png_oFFs, 4))
         png_handle_oFFs(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_pCAL_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
+      else if (!png_memcmp(chunk_name, png_pCAL, 4))
         png_handle_pCAL(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sCAL_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+      else if (!png_memcmp(chunk_name, png_sCAL, 4))
         png_handle_sCAL(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
+      else if (!png_memcmp(chunk_name, png_pHYs, 4))
         png_handle_pHYs(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
+      else if (!png_memcmp(chunk_name, png_sBIT, 4))
         png_handle_sBIT(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
+      else if (!png_memcmp(chunk_name, png_sRGB, 4))
         png_handle_sRGB(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_iCCP_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+      else if (!png_memcmp(chunk_name, png_iCCP, 4))
         png_handle_iCCP(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+      else if (!png_memcmp(chunk_name, png_sPLT, 4))
         png_handle_sPLT(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
+      else if (!png_memcmp(chunk_name, png_tEXt, 4))
         png_handle_tEXt(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_tIME_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
+      else if (!png_memcmp(chunk_name, png_tIME, 4))
         png_handle_tIME(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
+      else if (!png_memcmp(chunk_name, png_tRNS, 4))
         png_handle_tRNS(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+      else if (!png_memcmp(chunk_name, png_zTXt, 4))
         png_handle_zTXt(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+      else if (!png_memcmp(chunk_name, png_iTXt, 4))
         png_handle_iTXt(png_ptr, info_ptr, length);
 #endif
      else
@@ -530,12 +535,13 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 }
 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */

-/* optional call to update the users info_ptr structure */
+/* Optional call to update the users info_ptr structure */
 void PNGAPI
 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_read_update_info\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_read_update_info");
+   if (png_ptr == NULL)
+      return;
   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
      png_read_start_row(png_ptr);
   else
@@ -553,8 +559,9 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 void PNGAPI
 png_start_read_image(png_structp png_ptr)
 {
-   png_debug(1, "in png_start_read_image\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_start_read_image");
+   if (png_ptr == NULL)
+      return;
   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
      png_read_start_row(png_ptr);
 }
@@ -567,18 +574,19 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 #ifdef PNG_USE_LOCAL_ARRAYS
   PNG_CONST PNG_IDAT;
   PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
-     0xff};
+      0xff};
   PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 #endif
   int ret;
-   if(png_ptr == NULL) return;
-   png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
+   if (png_ptr == NULL)
+      return;
+   png_debug2(1, "in png_read_row (row %lu, pass %d)",
      png_ptr->row_number, png_ptr->pass);
   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
      png_read_start_row(png_ptr);
   if (png_ptr->row_number == 0 && png_ptr->pass == 0)
   {
-   /* check for transforms that have been set but were defined out */
+   /* Check for transforms that have been set but were defined out */
 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
   if (png_ptr->transformations & PNG_INVERT_MONO)
      png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
@@ -610,7 +618,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
   }

 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-   /* if interlaced and we do not need a new row, combine row and return */
+   /* If interlaced and we do not need a new row, combine row and return */
   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
   {
      switch (png_ptr->pass)
@@ -697,15 +705,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
      {
         while (!png_ptr->idat_size)
         {
-            png_byte chunk_length[4];
-
            png_crc_finish(png_ptr, 0);

-            png_read_data(png_ptr, chunk_length, 4);
-            png_ptr->idat_size = png_get_uint_31(png_ptr,chunk_length);
-
-            png_reset_crc(png_ptr);
-            png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+            png_ptr->idat_size = png_read_chunk_header(png_ptr);
            if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
               png_error(png_ptr, "Not enough image data");
         }
@@ -741,7 +743,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
   png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
       png_ptr->row_info.width);

-   if(png_ptr->row_buf[0])
+   if (png_ptr->row_buf[0])
   png_read_filter_row(png_ptr, &(png_ptr->row_info),
      png_ptr->row_buf + 1, png_ptr->prev_row + 1,
      (int)(png_ptr->row_buf[0]));
@@ -750,7 +752,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
      png_ptr->rowbytes + 1);

 #if defined(PNG_MNG_FEATURES_SUPPORTED)
-   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
   {
      /* Intrapixel differencing */
@@ -763,15 +765,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
      png_do_read_transformations(png_ptr);

 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-   /* blow up interlaced rows to full size */
+   /* Blow up interlaced rows to full size */
   if (png_ptr->interlaced &&
      (png_ptr->transformations & PNG_INTERLACE))
   {
      if (png_ptr->pass < 6)
-/*       old interface (pre-1.0.9):
-         png_do_read_interlace(&(png_ptr->row_info),
-            png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
- */
+         /* Old interface (pre-1.0.9):
+          * png_do_read_interlace(&(png_ptr->row_info),
+          *    png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+          */
         png_do_read_interlace(png_ptr);

      if (dsp_row != NULL)
@@ -829,8 +831,9 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
   png_bytepp rp;
   png_bytepp dp;

-   png_debug(1, "in png_read_rows\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_read_rows");
+   if (png_ptr == NULL)
+      return;
   rp = row;
   dp = display_row;
   if (rp != NULL && dp != NULL)
@@ -841,14 +844,14 @@ png_read_rows(png_structp png_ptr, png_bytepp row,

         png_read_row(png_ptr, rptr, dptr);
      }
-   else if(rp != NULL)
+   else if (rp != NULL)
      for (i = 0; i < num_rows; i++)
      {
         png_bytep rptr = *rp;
         png_read_row(png_ptr, rptr, png_bytep_NULL);
         rp++;
      }
-   else if(dp != NULL)
+   else if (dp != NULL)
      for (i = 0; i < num_rows; i++)
      {
         png_bytep dptr = *dp;
@@ -874,12 +877,13 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
 void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)
 {
-   png_uint_32 i,image_height;
+   png_uint_32 i, image_height;
   int pass, j;
   png_bytepp rp;

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

 #ifdef PNG_READ_INTERLACING_SUPPORTED
   pass = png_set_interlace_handling(png_ptr);
@@ -914,11 +918,9 @@ png_read_image(png_structp png_ptr, png_bytepp image)
 void PNGAPI
 png_read_end(png_structp png_ptr, png_infop info_ptr)
 {
-   png_byte chunk_length[4];
-   png_uint_32 length;
-
-   png_debug(1, "in png_read_end\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_read_end");
+   if (png_ptr == NULL)
+      return;
   png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */

   do
@@ -980,33 +982,27 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
      PNG_CONST PNG_zTXt;
 #endif
 #endif /* PNG_USE_LOCAL_ARRAYS */
+      png_uint_32 length = png_read_chunk_header(png_ptr);
+      PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;

-      png_read_data(png_ptr, chunk_length, 4);
-      length = png_get_uint_31(png_ptr,chunk_length);
-
-      png_reset_crc(png_ptr);
-      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-
-      png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);
-
-      if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
+      if (!png_memcmp(chunk_name, png_IHDR, 4))
         png_handle_IHDR(png_ptr, info_ptr, length);
-      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+      else if (!png_memcmp(chunk_name, png_IEND, 4))
         png_handle_IEND(png_ptr, info_ptr, length);
 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-      else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+      else if (png_handle_as_unknown(png_ptr, chunk_name))
      {
-         if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         if (!png_memcmp(chunk_name, png_IDAT, 4))
         {
            if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
               png_error(png_ptr, "Too many IDAT's found");
         }
         png_handle_unknown(png_ptr, info_ptr, length);
-         if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+         if (!png_memcmp(chunk_name, png_PLTE, 4))
            png_ptr->mode |= PNG_HAVE_PLTE;
      }
 #endif
-      else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+      else if (!png_memcmp(chunk_name, png_IDAT, 4))
      {
         /* Zero length IDATs are legal after the last IDAT has been
          * read, but not after other chunks have been read.
@@ -1015,74 +1011,74 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
            png_error(png_ptr, "Too many IDAT's found");
         png_crc_finish(png_ptr, length);
      }
-      else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+      else if (!png_memcmp(chunk_name, png_PLTE, 4))
         png_handle_PLTE(png_ptr, info_ptr, length);
 #if defined(PNG_READ_bKGD_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
+      else if (!png_memcmp(chunk_name, png_bKGD, 4))
         png_handle_bKGD(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_cHRM_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
+      else if (!png_memcmp(chunk_name, png_cHRM, 4))
         png_handle_cHRM(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_gAMA_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
+      else if (!png_memcmp(chunk_name, png_gAMA, 4))
         png_handle_gAMA(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
+      else if (!png_memcmp(chunk_name, png_hIST, 4))
         png_handle_hIST(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
+      else if (!png_memcmp(chunk_name, png_oFFs, 4))
         png_handle_oFFs(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_pCAL_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
+      else if (!png_memcmp(chunk_name, png_pCAL, 4))
         png_handle_pCAL(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sCAL_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+      else if (!png_memcmp(chunk_name, png_sCAL, 4))
         png_handle_sCAL(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
+      else if (!png_memcmp(chunk_name, png_pHYs, 4))
         png_handle_pHYs(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
+      else if (!png_memcmp(chunk_name, png_sBIT, 4))
         png_handle_sBIT(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
+      else if (!png_memcmp(chunk_name, png_sRGB, 4))
         png_handle_sRGB(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_iCCP_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+      else if (!png_memcmp(chunk_name, png_iCCP, 4))
         png_handle_iCCP(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+      else if (!png_memcmp(chunk_name, png_sPLT, 4))
         png_handle_sPLT(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
+      else if (!png_memcmp(chunk_name, png_tEXt, 4))
         png_handle_tEXt(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_tIME_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
+      else if (!png_memcmp(chunk_name, png_tIME, 4))
         png_handle_tIME(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
+      else if (!png_memcmp(chunk_name, png_tRNS, 4))
         png_handle_tRNS(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+      else if (!png_memcmp(chunk_name, png_zTXt, 4))
         png_handle_zTXt(png_ptr, info_ptr, length);
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
-      else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+      else if (!png_memcmp(chunk_name, png_iTXt, 4))
         png_handle_iTXt(png_ptr, info_ptr, length);
 #endif
      else
@@ -1091,7 +1087,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 }
 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */

-/* free all memory used by the read */
+/* Free all memory used by the read */
 void PNGAPI
 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
   png_infopp end_info_ptr_ptr)
@@ -1099,13 +1095,20 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
   png_structp png_ptr = NULL;
   png_infop info_ptr = NULL, end_info_ptr = NULL;
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_free_ptr free_fn;
-   png_voidp mem_ptr;
+   png_free_ptr free_fn = NULL;
+   png_voidp mem_ptr = NULL;
 #endif

-   png_debug(1, "in png_destroy_read_struct\n");
+   png_debug(1, "in png_destroy_read_struct");
   if (png_ptr_ptr != NULL)
      png_ptr = *png_ptr_ptr;
+   if (png_ptr == NULL)
+      return;
+
+#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;
@@ -1113,11 +1116,6 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
   if (end_info_ptr_ptr != NULL)
      end_info_ptr = *end_info_ptr_ptr;

-#ifdef PNG_USER_MEM_SUPPORTED
-   free_fn = png_ptr->free_fn;
-   mem_ptr = png_ptr->mem_ptr;
-#endif
-
   png_read_destroy(png_ptr, info_ptr, end_info_ptr);

   if (info_ptr != NULL)
@@ -1161,7 +1159,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
   }
 }

-/* free all memory used by the read (old method) */
+/* Free all memory used by the read (old method) */
 void /* PRIVATE */
 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
 {
@@ -1175,7 +1173,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
   png_free_ptr free_fn;
 #endif

-   png_debug(1, "in png_read_destroy\n");
+   png_debug(1, "in png_read_destroy");
   if (info_ptr != NULL)
      png_info_destroy(png_ptr, info_ptr);

@@ -1185,6 +1183,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
   png_free(png_ptr, png_ptr->zbuf);
   png_free(png_ptr, png_ptr->big_row_buf);
   png_free(png_ptr, png_ptr->prev_row);
+   png_free(png_ptr, png_ptr->chunkdata);
 #if defined(PNG_READ_DITHER_SUPPORTED)
   png_free(png_ptr, png_ptr->palette_lookup);
   png_free(png_ptr, png_ptr->dither_index);
@@ -1281,7 +1280,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    * being used again.
    */
 #ifdef PNG_SETJMP_SUPPORTED
-   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
 #endif

   error_fn = png_ptr->error_fn;
@@ -1291,7 +1290,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
   free_fn = png_ptr->free_fn;
 #endif

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

   png_ptr->error_fn = error_fn;
   png_ptr->warning_fn = warning_fn;
@@ -1301,7 +1300,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 #endif

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

 }
@@ -1309,7 +1308,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 void PNGAPI
 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
 {
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
   png_ptr->read_row_fn = read_row_fn;
 }

@@ -1323,9 +1323,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 {
   int row;

-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
-   /* invert the alpha channel from opacity to transparency
+   /* Invert the alpha channel from opacity to transparency
    */
   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
       png_set_invert_alpha(png_ptr);
@@ -1336,15 +1337,15 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    */
   png_read_info(png_ptr, info_ptr);
   if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
-      png_error(png_ptr,"Image is too high to process with png_read_png()");
+      png_error(png_ptr, "Image is too high to process with png_read_png()");

   /* -------------- image transformations start here ------------------- */

 #if defined(PNG_READ_16_TO_8_SUPPORTED)
-   /* tell libpng to strip 16 bit/color files down to 8 bits per color
+   /* Tell libpng to strip 16 bit/color files down to 8 bits per color.
    */
   if (transforms & PNG_TRANSFORM_STRIP_16)
-       png_set_strip_16(png_ptr);
+      png_set_strip_16(png_ptr);
 #endif

 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
@@ -1352,7 +1353,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    * the background (not recommended).
    */
   if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
-       png_set_strip_alpha(png_ptr);
+      png_set_strip_alpha(png_ptr);
 #endif

 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1360,7 +1361,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    * byte into separate bytes (useful for paletted and grayscale images).
    */
   if (transforms & PNG_TRANSFORM_PACKING)
-       png_set_packing(png_ptr);
+      png_set_packing(png_ptr);
 #endif

 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
@@ -1368,7 +1369,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    * (not useful if you are using png_set_packing).
    */
   if (transforms & PNG_TRANSFORM_PACKSWAP)
-       png_set_packswap(png_ptr);
+      png_set_packswap(png_ptr);
 #endif

 #if defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1378,9 +1379,9 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    * channels so the data will be available as RGBA quartets.
    */
   if (transforms & PNG_TRANSFORM_EXPAND)
-       if ((png_ptr->bit_depth < 8) ||
-           (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
-           (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+      if ((png_ptr->bit_depth < 8) ||
+          (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+          (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
         png_set_expand(png_ptr);
 #endif

@@ -1388,10 +1389,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    */

 #if defined(PNG_READ_INVERT_SUPPORTED)
-   /* invert monochrome files to have 0 as white and 1 as black
+   /* Invert monochrome files to have 0 as white and 1 as black
    */
   if (transforms & PNG_TRANSFORM_INVERT_MONO)
-       png_set_invert_mono(png_ptr);
+      png_set_invert_mono(png_ptr);
 #endif

 #if defined(PNG_READ_SHIFT_SUPPORTED)
@@ -1410,24 +1411,24 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 #endif

 #if defined(PNG_READ_BGR_SUPPORTED)
-   /* flip the RGB pixels to BGR (or RGBA to BGRA)
+   /* Flip the RGB pixels to BGR (or RGBA to BGRA)
    */
   if (transforms & PNG_TRANSFORM_BGR)
-       png_set_bgr(png_ptr);
+      png_set_bgr(png_ptr);
 #endif

 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
-   /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
+   /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
    */
   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
       png_set_swap_alpha(png_ptr);
 #endif

 #if defined(PNG_READ_SWAP_SUPPORTED)
-   /* swap bytes of 16 bit files to least significant byte first
+   /* Swap bytes of 16 bit files to least significant byte first
    */
   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
-       png_set_swap(png_ptr);
+      png_set_swap(png_ptr);
 #endif

   /* We don't handle adding filler bytes */
@@ -1443,27 +1444,27 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FREE_ME_SUPPORTED
   png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
 #endif
-   if(info_ptr->row_pointers == NULL)
+   if (info_ptr->row_pointers == NULL)
   {
      info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
         info_ptr->height * png_sizeof(png_bytep));
+      png_memset(info_ptr->row_pointers, 0, info_ptr->height
+         * png_sizeof(png_bytep));
 #ifdef PNG_FREE_ME_SUPPORTED
      info_ptr->free_me |= PNG_FREE_ROWS;
 #endif
      for (row = 0; row < (int)info_ptr->height; row++)
-      {
         info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
            png_get_rowbytes(png_ptr, info_ptr));
-      }
   }

   png_read_image(png_ptr, info_ptr->row_pointers);
   info_ptr->valid |= PNG_INFO_IDAT;

-   /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
   png_read_end(png_ptr, info_ptr);

-   transforms = transforms; /* quiet compiler warnings */
+   transforms = transforms; /* Quiet compiler warnings */
   params = params;

 }
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,12 +1,15 @@

 /* pngrio.c - functions for data input
 *
- * Last changed in libpng 1.2.13 November 13, 2006
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2006 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 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 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
@@ -17,18 +20,18 @@

 #define PNG_INTERNAL
 #include "png.h"
-
 #if defined(PNG_READ_SUPPORTED)

 /* Read the data from whatever input you are using.  The default routine
-   reads from a file pointer.  Note that this routine sometimes gets called
-   with very small lengths, so you should implement some kind of simple
-   buffering if you are using unbuffered reads.  This should never be asked
-   to read more then 64K on a 16 bit machine. */
+ * reads from a file pointer.  Note that this routine sometimes gets called
+ * with very small lengths, so you should implement some kind of simple
+ * buffering if you are using unbuffered reads.  This should never be asked
+ * to read more then 64K on a 16 bit machine.
+ */
 void /* PRIVATE */
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
-   png_debug1(4,"reading %d bytes\n", (int)length);
+   png_debug1(4, "reading %d bytes", (int)length);
   if (png_ptr->read_data_fn != NULL)
      (*(png_ptr->read_data_fn))(png_ptr, data, length);
   else
@@ -37,16 +40,18 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)

 #if !defined(PNG_NO_STDIO)
 /* This is the function that does the actual reading of data.  If you are
-   not reading from a standard C stream, you should create a replacement
-   read_data function and use it at run time with png_set_read_fn(), rather
-   than changing the library. */
+ * not reading from a standard C stream, you should create a replacement
+ * read_data function and use it at run time with png_set_read_fn(), rather
+ * than changing the library.
+ */
 #ifndef USE_FAR_KEYWORD
 void PNGAPI
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
   png_size_t check;

-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
    * instead of an int, which is what fread() actually returns.
    */
@@ -62,7 +67,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
      png_error(png_ptr, "Read Error");
 }
 #else
-/* this is the model-independent version. Since the standard I/O library
+/* This is the model-independent version. Since the standard I/O library
   can't handle far buffers in the medium and small models, we have to copy
   the data.
 */
@@ -77,7 +82,8 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
   png_byte *n_data;
   png_FILE_p io_ptr;

-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
   /* Check if data really is near. If so, use usual code. */
   n_data = (png_byte *)CVT_PTR_NOCHECK(data);
   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
@@ -106,7 +112,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
         err = fread(buf, (png_size_t)1, read, io_ptr);
 #endif
         png_memcpy(data, buf, read); /* copy far buffer to near buffer */
-         if(err != read)
+         if (err != read)
            break;
         else
            check += err;
@@ -122,23 +128,27 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #endif

 /* This function allows the application to supply a new input function
-   for libpng if standard C streams aren't being used.
-
-   This function takes as its arguments:
-   png_ptr      - pointer to a png input data structure
-   io_ptr       - pointer to user supplied structure containing info about
-                  the input functions.  May be NULL.
-   read_data_fn - pointer to a new input function that takes as its
-                  arguments a pointer to a png_struct, a pointer to
-                  a location where input data can be stored, and a 32-bit
-                  unsigned int that is the number of bytes to be read.
-                  To exit and output any fatal error messages the new write
-                  function should call png_error(png_ptr, "Error msg"). */
+ * for libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ * png_ptr      - pointer to a png input data structure
+ * io_ptr       - pointer to user supplied structure containing info about
+ *                the input functions.  May be NULL.
+ * read_data_fn - pointer to a new input function that takes as its
+ *                arguments a pointer to a png_struct, a pointer to
+ *                a location where input data can be stored, and a 32-bit
+ *                unsigned int that is the number of bytes to be read.
+ *                To exit and output any fatal error messages the new write
+ *                function should call png_error(png_ptr, "Error msg").
+ *                May be NULL, in which case libpng's default function will
+ *                be used.
+ */
 void PNGAPI
 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
   png_rw_ptr read_data_fn)
 {
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
   png_ptr->io_ptr = io_ptr;

 #if !defined(PNG_NO_STDIO)
--- a/pngrtran.c
+++ b/pngrtran.c
--- a/pngrutil.c
+++ b/pngrutil.c
--- a/pngset.c
+++ b/pngset.c
--- a/pngtest.c
+++ b/pngtest.c
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,47 +1,53 @@

 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
 *
- * Last changed in libpng 1.2.17 May 15, 2007
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.36 [May 14, 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
 #include "png.h"
-
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* turn on BGR-to-RGB mapping */
+/* Turn on BGR-to-RGB mapping */
 void PNGAPI
 png_set_bgr(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_bgr\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_bgr");
+   if (png_ptr == NULL)
+      return;
   png_ptr->transformations |= PNG_BGR;
 }
 #endif

 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* turn on 16 bit byte swapping */
+/* Turn on 16 bit byte swapping */
 void PNGAPI
 png_set_swap(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_swap\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_swap");
+   if (png_ptr == NULL)
+      return;
   if (png_ptr->bit_depth == 16)
      png_ptr->transformations |= PNG_SWAP_BYTES;
 }
 #endif

 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-/* turn on pixel packing */
+/* Turn on pixel packing */
 void PNGAPI
 png_set_packing(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_packing\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_packing");
+   if (png_ptr == NULL)
+      return;
   if (png_ptr->bit_depth < 8)
   {
      png_ptr->transformations |= PNG_PACK;
@@ -51,12 +57,13 @@ png_set_packing(png_structp png_ptr)
 #endif

 #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-/* turn on packed pixel swapping */
+/* Turn on packed pixel swapping */
 void PNGAPI
 png_set_packswap(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_packswap\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_packswap");
+   if (png_ptr == NULL)
+      return;
   if (png_ptr->bit_depth < 8)
      png_ptr->transformations |= PNG_PACKSWAP;
 }
@@ -66,8 +73,9 @@ png_set_packswap(png_structp png_ptr)
 void PNGAPI
 png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 {
-   png_debug(1, "in png_set_shift\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_shift");
+   if (png_ptr == NULL)
+      return;
   png_ptr->transformations |= PNG_SHIFT;
   png_ptr->shift = *true_bits;
 }
@@ -78,7 +86,7 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 int PNGAPI
 png_set_interlace_handling(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_interlace handling\n");
+   png_debug(1, "in png_set_interlace handling");
   if (png_ptr && png_ptr->interlaced)
   {
      png_ptr->transformations |= PNG_INTERLACE;
@@ -98,8 +106,9 @@ png_set_interlace_handling(png_structp png_ptr)
 void PNGAPI
 png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
-   png_debug(1, "in png_set_filler\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_filler");
+   if (png_ptr == NULL)
+      return;
   png_ptr->transformations |= PNG_FILLER;
   png_ptr->filler = (png_byte)filler;
   if (filler_loc == PNG_FILLER_AFTER)
@@ -131,8 +140,9 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 void PNGAPI
 png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
-   png_debug(1, "in png_set_add_alpha\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_add_alpha");
+   if (png_ptr == NULL)
+      return;
   png_set_filler(png_ptr, filler, filler_loc);
   png_ptr->transformations |= PNG_ADD_ALPHA;
 }
@@ -145,8 +155,9 @@ png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 void PNGAPI
 png_set_swap_alpha(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_swap_alpha\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_swap_alpha");
+   if (png_ptr == NULL)
+      return;
   png_ptr->transformations |= PNG_SWAP_ALPHA;
 }
 #endif
@@ -156,8 +167,9 @@ png_set_swap_alpha(png_structp png_ptr)
 void PNGAPI
 png_set_invert_alpha(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_invert_alpha\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_invert_alpha");
+   if (png_ptr == NULL)
+      return;
   png_ptr->transformations |= PNG_INVERT_ALPHA;
 }
 #endif
@@ -166,16 +178,17 @@ png_set_invert_alpha(png_structp png_ptr)
 void PNGAPI
 png_set_invert_mono(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_invert_mono\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_invert_mono");
+   if (png_ptr == NULL)
+      return;
   png_ptr->transformations |= PNG_INVERT_MONO;
 }

-/* invert monochrome grayscale data */
+/* Invert monochrome grayscale data */
 void /* PRIVATE */
 png_do_invert(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_invert\n");
+   png_debug(1, "in png_do_invert");
  /* This test removed from libpng version 1.0.13 and 1.2.0:
   *   if (row_info->bit_depth == 1 &&
   */
@@ -226,11 +239,11 @@ png_do_invert(png_row_infop row_info, png_bytep row)
 #endif

 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* swaps byte order on 16 bit depth images */
+/* Swaps byte order on 16 bit depth images */
 void /* PRIVATE */
 png_do_swap(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_swap\n");
+   png_debug(1, "in png_do_swap");
   if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
       row != NULL && row_info != NULL &&
@@ -357,11 +370,11 @@ static PNG_CONST png_byte fourbppswaptable[256] = {
   0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
 };

-/* swaps pixel packing order within bytes */
+/* Swaps pixel packing order within bytes */
 void /* PRIVATE */
 png_do_packswap(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_packswap\n");
+   png_debug(1, "in png_do_packswap");
   if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
       row != NULL && row_info != NULL &&
@@ -389,11 +402,11 @@ png_do_packswap(png_row_infop row_info, png_bytep row)

 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-/* remove filler or alpha byte(s) */
+/* Remove filler or alpha byte(s) */
 void /* PRIVATE */
 png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 {
-   png_debug(1, "in png_do_strip_filler\n");
+   png_debug(1, "in png_do_strip_filler");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
   if (row != NULL && row_info != NULL)
 #endif
@@ -404,9 +417,9 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
      png_uint_32 i;

      if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
-         (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
-         (flags & PNG_FLAG_STRIP_ALPHA))) &&
-         row_info->channels == 4)
+          (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
+          (flags & PNG_FLAG_STRIP_ALPHA))) &&
+          row_info->channels == 4)
      {
         if (row_info->bit_depth == 8)
         {
@@ -547,11 +560,11 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 #endif

 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* swaps red and blue bytes within a pixel */
+/* Swaps red and blue bytes within a pixel */
 void /* PRIVATE */
 png_do_bgr(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_bgr\n");
+   png_debug(1, "in png_do_bgr");
   if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
       row != NULL && row_info != NULL &&
@@ -624,20 +637,21 @@ 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)
 {
-   png_debug(1, "in png_set_user_transform_info\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_set_user_transform_info");
+   if (png_ptr == NULL)
+      return;
 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
   png_ptr->user_transform_ptr = user_transform_ptr;
   png_ptr->user_transform_depth = (png_byte)user_transform_depth;
   png_ptr->user_transform_channels = (png_byte)user_transform_channels;
 #else
-   if(user_transform_ptr || user_transform_depth || user_transform_channels)
+   if (user_transform_ptr || user_transform_depth || user_transform_channels)
      png_warning(png_ptr,
        "This version of libpng does not support user transform info");
 #endif
@@ -652,8 +666,9 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp
 png_voidp PNGAPI
 png_get_user_transform_ptr(png_structp png_ptr)
 {
+   if (png_ptr == NULL)
+      return (NULL);
 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
-   if (png_ptr == NULL) return (NULL);
   return ((png_voidp)png_ptr->user_transform_ptr);
 #else
   return (NULL);
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,12 +1,15 @@

 /* pngwio.c - functions for data output
 *
- * Last changed in libpng 1.2.13 November 13, 2006
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2006 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 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 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
@@ -20,10 +23,11 @@
 #ifdef PNG_WRITE_SUPPORTED

 /* Write the data to whatever output you are using.  The default routine
-   writes to a file pointer.  Note that this routine sometimes gets called
-   with very small lengths, so you should implement some kind of simple
-   buffering if you are using unbuffered writes.  This should never be asked
-   to write more than 64K on a 16 bit machine.  */
+ * writes to a file pointer.  Note that this routine sometimes gets called
+ * with very small lengths, so you should implement some kind of simple
+ * buffering if you are using unbuffered writes.  This should never be asked
+ * to write more than 64K on a 16 bit machine.
+ */

 void /* PRIVATE */
 png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -36,16 +40,18 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)

 #if !defined(PNG_NO_STDIO)
 /* This is the function that does the actual writing of data.  If you are
-   not writing to a standard C stream, you should create a replacement
-   write_data function and use it at run time with png_set_write_fn(), rather
-   than changing the library. */
+ * not writing to a standard C stream, you should create a replacement
+ * write_data function and use it at run time with png_set_write_fn(), rather
+ * than changing the library.
+ */
 #ifndef USE_FAR_KEYWORD
 void PNGAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
   png_uint_32 check;

-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 #if defined(_WIN32_WCE)
   if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
      check = 0;
@@ -56,10 +62,10 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
      png_error(png_ptr, "Write Error");
 }
 #else
-/* this is the model-independent version. Since the standard I/O library
-   can't handle far buffers in the medium and small models, we have to copy
-   the data.
-*/
+/* This is the model-independent version. Since the standard I/O library
+ * can't handle far buffers in the medium and small models, we have to copy
+ * the data.
+ */

 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
@@ -71,7 +77,8 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
   png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
   png_FILE_p io_ptr;

-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
   /* Check if data really is near. If so, use usual code. */
   near_data = (png_byte *)CVT_PTR_NOCHECK(data);
   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
@@ -93,7 +100,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
      do
      {
         written = MIN(NEAR_BUF_SIZE, remaining);
-         png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+         png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
 #if defined(_WIN32_WCE)
         if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
            err = 0;
@@ -102,8 +109,10 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #endif
         if (err != written)
            break;
+
         else
            check += err;
+
         data += written;
         remaining -= written;
      }
@@ -117,8 +126,9 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #endif

 /* This function is called to output any data pending writing (normally
-   to disk).  After png_flush is called, there should be no data pending
-   writing in any buffers. */
+ * to disk).  After png_flush is called, there should be no data pending
+ * writing in any buffers.
+ */
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
 void /* PRIVATE */
 png_flush(png_structp png_ptr)
@@ -134,48 +144,58 @@ png_default_flush(png_structp png_ptr)
 #if !defined(_WIN32_WCE)
   png_FILE_p io_ptr;
 #endif
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 #if !defined(_WIN32_WCE)
   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
-   if (io_ptr != NULL)
-      fflush(io_ptr);
+   fflush(io_ptr);
 #endif
 }
 #endif
 #endif

 /* This function allows the application to supply new output functions for
-   libpng if standard C streams aren't being used.
-
-   This function takes as its arguments:
-   png_ptr       - pointer to a png output data structure
-   io_ptr        - pointer to user supplied structure containing info about
-                   the output functions.  May be NULL.
-   write_data_fn - pointer to a new output function that takes as its
-                   arguments a pointer to a png_struct, a pointer to
-                   data to be written, and a 32-bit unsigned int that is
-                   the number of bytes to be written.  The new write
-                   function should call png_error(png_ptr, "Error msg")
-                   to exit and output any fatal error messages.
-   flush_data_fn - pointer to a new flush function that takes as its
-                   arguments a pointer to a png_struct.  After a call to
-                   the flush function, there should be no data in any buffers
-                   or pending transmission.  If the output method doesn't do
-                   any buffering of ouput, a function prototype must still be
-                   supplied although it doesn't have to do anything.  If
-                   PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
-                   time, output_flush_fn will be ignored, although it must be
-                   supplied for compatibility. */
+ * libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ * png_ptr       - pointer to a png output data structure
+ * io_ptr        - pointer to user supplied structure containing info about
+ *                 the output functions.  May be NULL.
+ * write_data_fn - pointer to a new output function that takes as its
+ *                 arguments a pointer to a png_struct, a pointer to
+ *                 data to be written, and a 32-bit unsigned int that is
+ *                 the number of bytes to be written.  The new write
+ *                 function should call png_error(png_ptr, "Error msg")
+ *                 to exit and output any fatal error messages.  May be
+ *                 NULL, in which case libpng's default function will
+ *                 be used.
+ * flush_data_fn - pointer to a new flush function that takes as its
+ *                 arguments a pointer to a png_struct.  After a call to
+ *                 the flush function, there should be no data in any buffers
+ *                 or pending transmission.  If the output method doesn't do
+ *                 any buffering of ouput, a function prototype must still be
+ *                 supplied although it doesn't have to do anything.  If
+ *                 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
+ *                 time, output_flush_fn will be ignored, although it must be
+ *                 supplied for compatibility.  May be NULL, in which case
+ *                 libpng's default function will be used, if
+ *                 PNG_WRITE_FLUSH_SUPPORTED is defined.  This is not
+ *                 a good idea if io_ptr does not point to a standard
+ *                 *FILE structure.
+ */
 void PNGAPI
 png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
   png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
 {
-   if(png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
   png_ptr->io_ptr = io_ptr;

 #if !defined(PNG_NO_STDIO)
   if (write_data_fn != NULL)
      png_ptr->write_data_fn = write_data_fn;
+
   else
      png_ptr->write_data_fn = png_default_write_data;
 #else
@@ -186,6 +206,7 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
 #if !defined(PNG_NO_STDIO)
   if (output_flush_fn != NULL)
      png_ptr->output_flush_fn = output_flush_fn;
+
   else
      png_ptr->output_flush_fn = png_default_flush;
 #else
@@ -206,27 +227,31 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,

 #if defined(USE_FAR_KEYWORD)
 #if defined(_MSC_VER)
-void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
 {
   void *near_ptr;
   void FAR *far_ptr;
   FP_OFF(near_ptr) = FP_OFF(ptr);
   far_ptr = (void FAR *)near_ptr;
-   if(check != 0)
-      if(FP_SEG(ptr) != FP_SEG(far_ptr))
-         png_error(png_ptr,"segment lost in conversion");
+
+   if (check != 0)
+      if (FP_SEG(ptr) != FP_SEG(far_ptr))
+         png_error(png_ptr, "segment lost in conversion");
+
   return(near_ptr);
 }
 #  else
-void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
 {
   void *near_ptr;
   void FAR *far_ptr;
   near_ptr = (void FAR *)ptr;
   far_ptr = (void FAR *)near_ptr;
-   if(check != 0)
-      if(far_ptr != ptr)
-         png_error(png_ptr,"segment lost in conversion");
+
+   if (check != 0)
+      if (far_ptr != ptr)
+         png_error(png_ptr, "segment lost in conversion");
+
   return(near_ptr);
 }
 #   endif
--- a/pngwrite.c
+++ b/pngwrite.c
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,11 +1,14 @@

 /* pngwtran.c - transforms the data in a row for PNG writers
 *
- * Last changed in libpng 1.2.9 April 14, 2006
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2006 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 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
@@ -18,15 +21,15 @@
 void /* PRIVATE */
 png_do_write_transformations(png_structp png_ptr)
 {
-   png_debug(1, "in png_do_write_transformations\n");
+   png_debug(1, "in png_do_write_transformations");

   if (png_ptr == NULL)
      return;

 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
   if (png_ptr->transformations & PNG_USER_TRANSFORM)
-      if(png_ptr->write_user_transform_fn != NULL)
-        (*(png_ptr->write_user_transform_fn)) /* user write transform function */
+      if (png_ptr->write_user_transform_fn != NULL)
+        (*(png_ptr->write_user_transform_fn)) /* User write transform function */
          (png_ptr,                    /* png_ptr */
           &(png_ptr->row_info),       /* row_info:     */
             /*  png_uint_32 width;          width of row */
@@ -86,7 +89,7 @@ png_do_write_transformations(png_structp png_ptr)
 void /* PRIVATE */
 png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 {
-   png_debug(1, "in png_do_pack\n");
+   png_debug(1, "in png_do_pack");
   if (row_info->bit_depth == 8 &&
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
       row != NULL && row_info != NULL &&
@@ -212,7 +215,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 void /* PRIVATE */
 png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 {
-   png_debug(1, "in png_do_shift\n");
+   png_debug(1, "in png_do_shift");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
   if (row != NULL && row_info != NULL &&
 #else
@@ -248,7 +251,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
         channels++;
      }

-      /* with low row depths, could only be grayscale, so one channel */
+      /* With low row depths, could only be grayscale, so one channel */
      if (row_info->bit_depth < 8)
      {
         png_bytep bp = row;
@@ -336,7 +339,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 void /* PRIVATE */
 png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_swap_alpha\n");
+   png_debug(1, "in png_do_write_swap_alpha");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
   if (row != NULL && row_info != NULL)
 #endif
@@ -424,7 +427,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 void /* PRIVATE */
 png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_invert_alpha\n");
+   png_debug(1, "in png_do_write_invert_alpha");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
   if (row != NULL && row_info != NULL)
 #endif
@@ -439,7 +442,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
            png_uint_32 row_width = row_info->width;
            for (i = 0, sp = dp = row; i < row_width; i++)
            {
-               /* does nothing
+               /* Does nothing
               *(dp++) = *(sp++);
               *(dp++) = *(sp++);
               *(dp++) = *(sp++);
@@ -457,7 +460,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)

            for (i = 0, sp = dp = row; i < row_width; i++)
            {
-               /* does nothing
+               /* Does nothing
               *(dp++) = *(sp++);
               *(dp++) = *(sp++);
               *(dp++) = *(sp++);
@@ -495,7 +498,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)

            for (i = 0, sp = dp = row; i < row_width; i++)
            {
-               /* does nothing
+               /* Does nothing
               *(dp++) = *(sp++);
               *(dp++) = *(sp++);
               */
@@ -510,11 +513,11 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 #endif

 #if defined(PNG_MNG_FEATURES_SUPPORTED)
-/* undoes intrapixel differencing  */
+/* Undoes intrapixel differencing  */
 void /* PRIVATE */
 png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_intrapixel\n");
+   png_debug(1, "in png_do_write_intrapixel");
   if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
       row != NULL && row_info != NULL &&
@@ -558,8 +561,8 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
            png_uint_32 s0   = (*(rp  ) << 8) | *(rp+1);
            png_uint_32 s1   = (*(rp+2) << 8) | *(rp+3);
            png_uint_32 s2   = (*(rp+4) << 8) | *(rp+5);
-            png_uint_32 red  = (png_uint_32)((s0-s1) & 0xffffL);
-            png_uint_32 blue = (png_uint_32)((s2-s1) & 0xffffL);
+            png_uint_32 red  = (png_uint_32)((s0 - s1) & 0xffffL);
+            png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
            *(rp  ) = (png_byte)((red >> 8) & 0xff);
            *(rp+1) = (png_byte)(red & 0xff);
            *(rp+4) = (png_byte)((blue >> 8) & 0xff);
--- a/pngwutil.c
+++ b/pngwutil.c
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -1,17 +1,24 @@
-                                             
-project(PNG)
+project(PNG C)
+cmake_minimum_required(VERSION 2.4.3)

 # Copyright (C) 2007 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 2)
-set(PNGLIB_RELEASE 23)
+set(PNGLIB_RELEASE 41)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})

+set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
+
 # needed packages
 find_package(ZLIB REQUIRED)
+include_directories(${ZLIB_INCLUDE_DIR})
+
 if(NOT WIN32)
 find_library(M_LIBRARY
     NAMES m
@@ -20,24 +27,33 @@ if(NOT WIN32)
 if(NOT M_LIBRARY)
   message(STATUS
     "math library 'libm' not found - floating point support disabled")
- endif(NOT M_LIBRARY)
-else(NOT WIN32)
+ endif()
+else()
 # not needed on windows
 set(M_LIBRARY "")
-endif(NOT WIN32)
-
+endif()

 # COMMAND LINE OPTIONS
-option(PNG_SHARED "Build shared lib" YES)
-option(PNG_STATIC "Build static lib" YES)
+if(DEFINED PNG_SHARED)
+  option(PNG_SHARED "Build shared lib" ${PNG_SHARED})
+else()
+  option(PNG_SHARED "Build shared lib" ON)
+endif()
+if(DEFINED PNG_STATIC)
+  option(PNG_STATIC "Build static lib" ${PNG_STATIC})
+else()
+  option(PNG_STATIC "Build static lib" ON)
+endif()
+
 if(MINGW)
  option(PNG_TESTS  "Build pngtest" NO)
 else(MINGW)
  option(PNG_TESTS  "Build pngtest" YES)
 endif(MINGW)
+
 option(PNG_NO_CONSOLE_IO "FIXME" YES)
 option(PNG_NO_STDIO      "FIXME" YES)
-option(PNG_DEBUG         "Build with debug output" YES)
+option(PNG_DEBUG         "Build with debug output" NO)
 option(PNGARG            "FIXME" YES)
 #TODO:
 # PNG_CONSOLE_IO_SUPPORTED
@@ -54,20 +70,16 @@ if(NOT WIN32)
      set(png_asm_tmp "OFF")
   endif("uname_output" MATCHES "^.*i[1-9]86.*$")
 endif(uname_executable)
-else(NOT WIN32)
+else()
 # this env var is normally only set on win64
 SET(TEXT "ProgramFiles(x86)")
 if("$ENV{${TEXT}}" STREQUAL "")
  set(png_asm_tmp "ON")
 endif("$ENV{${TEXT}}" STREQUAL "")
-endif(NOT WIN32)
+endif()

 # SET LIBNAME
-# msvc does not append 'lib' - do it here to have consistent name
-if(MSVC)
- set(PNG_LIB_NAME lib)
-endif(MSVC)
-set(PNG_LIB_NAME ${PNG_LIB_NAME}png${PNGLIB_MAJOR}${PNGLIB_MINOR})
+set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})

 # to distinguish between debug and release lib
 set(CMAKE_DEBUG_POSTFIX "d")
@@ -101,54 +113,67 @@ if(MSVC)
  add_definitions(-DPNG_NO_MODULEDEF -D_CRT_SECURE_NO_DEPRECATE)
 endif(MSVC)

-add_definitions(-DZLIB_DLL)
+if(PNG_SHARED OR  NOT MSVC)
+	#if building msvc static this has NOT do be defined
+	add_definitions(-DZLIB_DLL)
+endif()

 add_definitions(-DLIBPNG_NO_MMX)
 add_definitions(-DPNG_NO_MMX_CODE)

 if(PNG_CONSOLE_IO_SUPPORTED)
 add_definitions(-DPNG_CONSOLE_IO_SUPPORTED)
-endif(PNG_CONSOLE_IO_SUPPORTED)
+endif()

 if(PNG_NO_CONSOLE_IO)
 add_definitions(-DPNG_NO_CONSOLE_IO)
-endif(PNG_NO_CONSOLE_IO)
+endif()

 if(PNG_NO_STDIO)
 add_definitions(-DPNG_NO_STDIO)
-endif(PNG_NO_STDIO)
+endif()

 if(PNG_DEBUG)
 add_definitions(-DPNG_DEBUG)
-endif(PNG_DEBUG)
+endif()

 if(NOT M_LIBRARY AND NOT WIN32)
 add_definitions(-DPNG_NO_FLOATING_POINT_SUPPORTED)
-endif(NOT M_LIBRARY AND NOT WIN32)
+endif()

 # NOW BUILD OUR TARGET
 include_directories(${PNG_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})

 if(PNG_SHARED)
 add_library(${PNG_LIB_NAME} SHARED ${libpng_sources})
+ if(MSVC)
+   # msvc does not append 'lib' - do it here to have consistent name
+   set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
+ endif()
 target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
-endif(PNG_SHARED)
+endif()
+
 if(PNG_STATIC)
 # does not work without changing name
 set(PNG_LIB_NAME_STATIC ${PNG_LIB_NAME}_static)
 add_library(${PNG_LIB_NAME_STATIC} STATIC ${libpng_sources})
-endif(PNG_STATIC)
+ if(MSVC)
+   # msvc does not append 'lib' - do it here to have consistent name
+   set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")
+ endif()
+endif()
+

 if(PNG_SHARED AND WIN32)
 set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
-endif(PNG_SHARED AND WIN32)
+endif()

-if(PNG_TESTS)
+if(PNG_TESTS AND PNG_SHARED)
 # does not work with msvc due to png_lib_ver issue
 add_executable(pngtest ${pngtest_sources})
 target_link_libraries(pngtest ${PNG_LIB_NAME})
 #  add_test(pngtest ${PNG_SOURCE_DIR}/pngtest.png)
-endif(PNG_TESTS)
+endif()


 # CREATE PKGCONFIG FILES
@@ -168,31 +193,49 @@ configure_file(${PNG_SOURCE_DIR}/scripts/libpng-config.in
  ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config)

 # SET UP LINKS
-set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#    VERSION 0.${PNGLIB_RELEASE}.1.2.23
+if(PNG_SHARED)
+  set_target_properties(${PNG_LIB_NAME} PROPERTIES
+#    VERSION 0.${PNGLIB_RELEASE}.1.2.41beta02
     VERSION 0.${PNGLIB_RELEASE}.0
     SOVERSION 0
     CLEAN_DIRECT_OUTPUT 1)
-if(NOT WIN32)
-  # that's uncool on win32 - it overwrites our static import lib...
-  set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
-     OUTPUT_NAME ${PNG_LIB_NAME}
-     CLEAN_DIRECT_OUTPUT 1)
-endif(NOT WIN32)
-# INSTALL
-install_targets(/lib ${PNG_LIB_NAME})
+endif()
 if(PNG_STATIC)
-  install_targets(/lib ${PNG_LIB_NAME_STATIC})
-endif(PNG_STATIC)
+  if(NOT WIN32)
+    # that's uncool on win32 - it overwrites our static import lib...
+    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
+       OUTPUT_NAME ${PNG_LIB_NAME}
+       CLEAN_DIRECT_OUTPUT 1)
+  endif()
+endif()

+# INSTALL
+if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
+    if(PNG_SHARED)
+        install(TARGETS ${PNG_LIB_NAME}
+            RUNTIME DESTINATION bin
+            LIBRARY DESTINATION lib
+            ARCHIVE DESTINATION lib)
+    endif()
+    if(PNG_STATIC)
+        install(TARGETS ${PNG_LIB_NAME_STATIC}
+            LIBRARY DESTINATION lib
+            ARCHIVE DESTINATION lib)
+    endif()
+endif()
+
+if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
 install(FILES png.h pngconf.h         DESTINATION include)
 install(FILES png.h pngconf.h         DESTINATION include/${PNGLIB_NAME})
-install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)
-install(FILES png.5                           DESTINATION man/man5)
-install(FILES ${PNG_BINARY_DIR}/libpng.pc     DESTINATION lib/pkgconfig)
-install(FILES ${PNG_BINARY_DIR}/libpng-config      DESTINATION bin)
-install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}.pc  DESTINATION lib/pkgconfig)
-install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config DESTINATION bin)
+endif()
+if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
+    install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)
+    install(FILES png.5                           DESTINATION man/man5)
+    install(FILES ${PNG_BINARY_DIR}/libpng.pc     DESTINATION lib/pkgconfig)
+    install(FILES ${PNG_BINARY_DIR}/libpng-config      DESTINATION bin)
+    install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}.pc  DESTINATION lib/pkgconfig)
+    install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config DESTINATION bin)
+endif()

 # what's with libpng.txt and all the extra files?

--- a/scripts/descrip.mms
+++ b/scripts/descrip.mms
@@ -1,6 +1,6 @@

 cc_defs = /inc=$(ZLIBSRC)
-c_deb = 
+c_deb =

 .ifdef __DECC__
 pref = /prefix=all
@@ -29,7 +29,7 @@ test : pngtest.exe
   run pngtest

 clean :
-	delete *.obj;*,*.exe;*
+	delete *.obj;*,*.exe;


 # Other dependencies.
@@ -44,9 +44,9 @@ pngerror.obj : png.h, pngconf.h
 pngmem.obj : png.h, pngconf.h
 pngrio.obj : png.h, pngconf.h
 pngwio.obj : png.h, pngconf.h
-pngtest.obj : png.h, pngconf.h
 pngtrans.obj : png.h, pngconf.h
 pngwrite.obj : png.h, pngconf.h
 pngwtran.obj : png.h, pngconf.h
 pngwutil.obj : png.h, pngconf.h

+pngtest.obj : png.h, pngconf.h
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -4,11 +4,14 @@
 # provides configuration info for libpng.

 # Copyright (C) 2002 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Modeled after libxml-config.

-version=1.2.23
+version=1.2.41beta02
 prefix=""
 libdir=""
 libs=""
--- a/scripts/libpng-config.in
+++ b/scripts/libpng-config.in
@@ -4,7 +4,10 @@
 # provides configuration info for libpng.

 # Copyright (C) 2002, 2004, 2006, 2007 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Modeled after libxml-config.

@@ -14,7 +17,7 @@ exec_prefix="@exec_prefix@"
 libdir="@libdir@"
 includedir="@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
 libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
-all_libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ -lz -lm"
+all_libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ @LIBS@"
 I_opts="-I${includedir}"
 L_opts="-L${libdir}"
 R_opts=""
--- a/scripts/libpng.icc
+++ b/scripts/libpng.icc
@@ -1,13 +1,16 @@
 // Project file for libpng (static)
 // IBM VisualAge/C++ version 4.0 or later
 // Copyright (C) 2000 Cosmin Truta
-// For conditions of distribution and use, see copyright notice in png.h
+//
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h
+//
 // Notes:
 //   All modules are compiled in C mode
 //   Tested with IBM VAC++ 4.0 under Win32
 //   Expected to work with IBM VAC++ 4.0 or later under OS/2 and Win32
 //   Can be easily adapted for IBM VAC++ 4.0 or later under AIX
-// For conditions of distribution and use, see copyright notice in png.h

 option incl(searchpath, "../zlib"), opt(level, "2"),
 link(libsearchpath, "../zlib")
--- a/scripts/libpng.pc-configure.in
+++ b/scripts/libpng.pc-configure.in
@@ -1,10 +1,11 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
-includedir=@includedir@/libpng12
+includedir=@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@

 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.23
-Libs: -L${libdir} -lpng12
+Version: @PNGLIB_VERSION@
+Libs: -L${libdir} -lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
+Libs.private: @LIBS@
 Cflags: -I${includedir} @LIBPNG_NO_MMX@
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng12

 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.23
+Version: 1.2.41beta02
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -3,12 +3,15 @@
 # Copyright (C) 2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -3,12 +3,15 @@
 # Copyright (C) 2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
--- a/scripts/makefile.acorn
+++ b/scripts/makefile.acorn
@@ -6,11 +6,10 @@ CCflags = -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah
 C++flags = -c -depend !Depend -IC: -throwback
 Linkflags = -aif -c++ -o $@
 ObjAsmflags = -throwback -NoCache -depend !Depend
-CMHGflags = 
+CMHGflags =
 LibFileflags = -c -l -o $@
 Squeezeflags = -o $@

-
 # Final targets:
@.libpng-lib:   @.o.png @.o.pngerror @.o.pngrio @.o.pngwio @.o.pngmem \
 	@.o.pngpread @.o.pngset @.o.pngget @.o.pngread @.o.pngrtran \
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -1,9 +1,12 @@
 # makefile for libpng using gcc (generic, static library)
-# Copyright (C) 2002, 2006 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006-2009 Glenn Randers-Pehrson
 # Copyright (C) 2000 Cosmin Truta
 # Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Location of the zlib library and include files
 ZLIBINC = ../zlib
@@ -20,7 +23,7 @@ LN_SF = ln -f -s

 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 prefix=/usr/local
@@ -44,7 +47,7 @@ CDEBUG = -g -DPNG_DEBUG=5
 LDDEBUG =
 CRELEASE = -O2
 LDRELEASE = -s
-WARNMORE=-Wall
+WARNMORE=-W -Wall
 CFLAGS = -I$(ZLIBINC) $(WARNMORE) $(CRELEASE)
 LDFLAGS = -L. -L$(ZLIBLIB) -lpng12 -lz -lm $(LDRELEASE)

@@ -54,7 +57,7 @@ A=.a
 E=

 # Variables
-OBJS = png$(O) pngerror$(O) pngget$(O) pngmem$(O) pngpread$(O) \
+OBJS =  png$(O) pngerror$(O) pngget$(O) pngmem$(O) pngpread$(O) \
 	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) pngset$(O) \
 	pngtrans$(O) pngwio$(O) pngwrite$(O) pngwtran$(O) pngwutil$(O)

@@ -94,20 +97,20 @@ install: $(LIBNAME)$(A)
 clean:
 	$(RM_F) *.o $(LIBNAME)$(A) pngtest pngout.png

-png$(O): png.h pngconf.h
+png$(O):      png.h pngconf.h
 pngerror$(O): png.h pngconf.h
-pngget$(O): png.h pngconf.h
-pngmem$(O): png.h pngconf.h
+pngget$(O):   png.h pngconf.h
+pngmem$(O):   png.h pngconf.h
 pngpread$(O): png.h pngconf.h
-pngread$(O): png.h pngconf.h
-pngrio$(O): png.h pngconf.h
+pngread$(O):  png.h pngconf.h
+pngrio$(O):   png.h pngconf.h
 pngrtran$(O): png.h pngconf.h
 pngrutil$(O): png.h pngconf.h
-pngset$(O): png.h pngconf.h
-pngtest$(O): png.h pngconf.h
+pngset$(O):   png.h pngconf.h
 pngtrans$(O): png.h pngconf.h
-pngwio$(O): png.h pngconf.h
+pngwio$(O):   png.h pngconf.h
 pngwrite$(O): png.h pngconf.h
 pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h

+pngtest$(O):  png.h pngconf.h
--- a/scripts/makefile.amiga
+++ b/scripts/makefile.amiga
@@ -1,7 +1,10 @@
 # Commodore Amiga Makefile
 # makefile for libpng and SAS C V6.5x compiler
 # Copyright (C) 1995-2000 Wolf Faust
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 #
 # Note: Use #define PNG_READ_BIG_ENDIAN_SUPPORTED in pngconf.h
 #
--- a/scripts/makefile.atari
+++ b/scripts/makefile.atari
@@ -1,8 +1,12 @@
 # makefile for libpng
 # Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
-# modified for LC56/ATARI assumes libz.lib is in same dir and uses default
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# Modified for LC56/ATARI assumes libz.lib is in same dir and uses default
 # rules for library management
 #
 CFLAGS=-I..\zlib -O
--- a/scripts/makefile.bc32
+++ b/scripts/makefile.bc32
@@ -11,7 +11,6 @@
 ## Where zlib.h, zconf.h and zlib.lib are
 ZLIB_DIR=..\zlib

-
 ## Compiler, linker and lib stuff
 CC=bcc32
 LD=bcc32
@@ -49,7 +48,6 @@ CFLAGS=-I$(ZLIB_DIR) -O2 -d -k- -w $(TARGET_CPU) $(CDEBUG)
 # -M  generate map file
 LDFLAGS=-L$(ZLIB_DIR) -M $(LDEBUG)

-
 ## Variables
 OBJS = \
 	png.obj \
@@ -87,7 +85,6 @@ LIBOBJS = \

 LIBNAME=libpng.lib

-
 ## Implicit rules
 # Braces let make "batch" calls to the compiler,
 # 2 calls instead of 12; space is important.
@@ -100,7 +97,6 @@ LIBNAME=libpng.lib
 .obj.exe:
 	$(LD) $(LDFLAGS) $*.obj $(LIBNAME) zlib.lib $(NOEHLIB)

-
 ## Major targets
 all: libpng pngtest

@@ -111,25 +107,24 @@ pngtest: pngtest.exe
 test: pngtest.exe
 	pngtest

-
 ## Minor Targets

-png.obj: png.c
-pngerror.obj: pngerror.c
-pngget.obj: pngget.c
-pngmem.obj: pngmem.c
-pngpread.obj: pngpread.c
-pngread.obj: pngread.c
-pngrio.obj: pngrio.c
-pngrtran.obj: pngrtran.c
-pngrutil.obj: pngrutil.c
-pngset.obj: pngset.c
-pngtrans.obj: pngtrans.c
-pngwio.obj: pngwio.c
-pngwrite.obj: pngwrite.c
-pngwtran.obj: pngwtran.c
-pngwutil.obj: pngwutil.c
-
+png.obj: png.c png.h pngconf.h
+pngerror.obj: pngerror.c png.h pngconf.h
+pngget.obj: pngget.c png.h pngconf.h
+pngmem.obj: pngmem.c png.h pngconf.h
+pngpread.obj: pngpread.c png.h pngconf.h
+pngread.obj: pngread.c png.h pngconf.h
+pngrio.obj: pngrio.c png.h pngconf.h
+pngrtran.obj: pngrtran.c png.h pngconf.h
+pngrutil.obj: pngrutil.c png.h pngconf.h
+pngset.obj: pngset.c png.h pngconf.h
+pngtrans.obj: pngtrans.c png.h pngconf.h
+pngwio.obj: pngwio.c png.h pngconf.h
+pngwrite.obj: pngwrite.c png.h pngconf.h
+pngwtran.obj: pngwtran.c png.h pngconf.h
+pngwutil.obj: pngwutil.c png.h pngconf.h
+pngtest.obj: pngtest.c png.h pngconf.h

 $(LIBNAME): $(OBJS)
 	-del $(LIBNAME)
@@ -137,7 +132,6 @@ $(LIBNAME): $(OBJS)
 $(LIBOBJS), libpng
 |

-
 # Cleanup
 clean:
 	-del *.obj
@@ -148,5 +142,4 @@ clean:
 	-del *.tds
 	-del pngout.png

-
 # End of makefile for libpng
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -1,14 +1,17 @@
 # makefile for libpng on BeOS x86 ELF with gcc
 # modified from makefile.linux by Sander Stoks
-# Copyright (C) 2002, 2006 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2008 Glenn Randers-Pehrson
 # Copyright (C) 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
@@ -41,7 +44,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \

 # On BeOS, -O1 is actually better than -O3.  This is a known bug but it's
 # still here in R4.5
-CFLAGS=-I$(ZLIBINC) -Wall -O1 -funroll-loops \
+CFLAGS=-I$(ZLIBINC) -W -Wall -O1 -funroll-loops \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 # LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz
 LDFLAGS=-L. -Wl,-soname=$(LIBSOMAJ) -L$(ZLIBLIB) -lz
@@ -223,4 +226,5 @@ pngwrite.o pngwrite.pic.o: png.h pngconf.h
 pngwtran.o pngwtran.pic.o: png.h pngconf.h
 pngwutil.o pngwutil.pic.o: png.h pngconf.h
 pngpread.o pngpread.pic.o: png.h pngconf.h
+
 pngtest.o: png.h pngconf.h
--- a/scripts/makefile.bor
+++ b/scripts/makefile.bor
@@ -12,7 +12,6 @@
 ## Where zlib.h, zconf.h and zlib_MODEL.lib are
 ZLIB_DIR=..\zlib

-
 ## Compiler, linker and lib stuff
 CC=bcc
 LD=bcc
@@ -57,8 +56,8 @@ CFLAGS=-O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)
 # -M  generate map file
 LDFLAGS=-M -L$(ZLIB_DIR) $(MODEL_ARG) $(LDEBUG)

-
 ## Variables
+
 OBJS = \
 	png.obj \
 	pngerror.obj \
@@ -95,8 +94,8 @@ LIBOBJS = \

 LIBNAME=libpng$(MODEL).lib

-
 ## Implicit rules
+
 # Braces let make "batch" calls to the compiler,
 # 2 calls instead of 12; space is important.
 .c.obj:
@@ -105,8 +104,8 @@ LIBNAME=libpng$(MODEL).lib
 .c.exe:
 	$(CC) $(CFLAGS) $(LDFLAGS) $*.c $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)

-
 ## Major targets
+
 all: libpng pngtest

 libpng: $(LIBNAME)
@@ -116,25 +115,23 @@ pngtest: pngtest$(MODEL).exe
 test: pngtest$(MODEL).exe
 	pngtest$(MODEL)

-
 ## Minor Targets

-png.obj: png.c
-pngerror.obj: pngerror.c
-pngget.obj: pngget.c
-pngmem.obj: pngmem.c
-pngpread.obj: pngpread.c
-pngread.obj: pngread.c
-pngrio.obj: pngrio.c
-pngrtran.obj: pngrtran.c
-pngrutil.obj: pngrutil.c
-pngset.obj: pngset.c
-pngtrans.obj: pngtrans.c
-pngwio.obj: pngwio.c
-pngwrite.obj: pngwrite.c
-pngwtran.obj: pngwtran.c
-pngwutil.obj: pngwutil.c
-
+png.obj: png.c png.h pngconf.h
+pngerror.obj: pngerror.c png.h pngconf.h
+pngget.obj: pngget.c png.h pngconf.h
+pngmem.obj: pngmem.c png.h pngconf.h
+pngpread.obj: pngpread.c png.h pngconf.h
+pngread.obj: pngread.c png.h pngconf.h
+pngrio.obj: pngrio.c png.h pngconf.h
+pngrtran.obj: pngrtran.c png.h pngconf.h
+pngrutil.obj: pngrutil.c png.h pngconf.h
+pngset.obj: pngset.c png.h pngconf.h
+pngtrans.obj: pngtrans.c png.h pngconf.h
+pngwio.obj: pngwio.c png.h pngconf.h
+pngwrite.obj: pngwrite.c png.h pngconf.h
+pngwtran.obj: pngwtran.c png.h pngconf.h
+pngwutil.obj: pngwutil.c png.h pngconf.h

 $(LIBNAME): $(OBJS)
 	-del $(LIBNAME)
@@ -142,14 +139,12 @@ $(LIBNAME): $(OBJS)
 $(LIBOBJS), libpng$(MODEL)
 |

-
 pngtest$(MODEL).obj: pngtest.c
 	$(CC) $(CFLAGS) -opngtest$(MODEL) -c pngtest.c

 pngtest$(MODEL).exe: pngtest$(MODEL).obj
 	$(LD) $(LDFLAGS) pngtest$(MODEL).obj $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)

-
 # Clean up anything else you want
 clean:
 	-del *.obj
@@ -158,5 +153,4 @@ clean:
 	-del *.lst
 	-del *.map

-
 # End of makefile for libpng
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -3,11 +3,14 @@
 #   of the library, and builds two copies of pngtest: one
 #   statically linked and one dynamically linked.
 #
-# Copyright (C) 2002, 2006, 2007 Soren Anderson, Charles Wilson,
+# Copyright (C) 2002, 2006-2008 Soren Anderson, Charles Wilson,
 #    and Glenn Randers-Pehrson, based on makefile for linux-elf w/mmx by:
 # Copyright (C) 1998-2000 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # This makefile intends to support building outside the src directory
 # if desired. When invoking it, specify an argument to SRCDIR on the
@@ -60,21 +63,21 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \

 ### if you don't need thread safety, but want the asm accel
 #CFLAGS= $(strip $(MINGW_CCFLAGS) -DPNG_THREAD_UNSAFE_OK \
-#	$(addprefix -I,$(ZLIBINC)) -Wall -O $(ALIGN) -funroll-loops \
+#	$(addprefix -I,$(ZLIBINC)) -W -Wall -O $(ALIGN) -funroll-loops \
 #	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### if you need thread safety and want (minimal) asm accel
 #CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
-#	-Wall -O $(ALIGN) -funroll-loops \
+#	-W -Wall -O $(ALIGN) -funroll-loops \
 #	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### Normal (non-asm) compilation
 CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
-        -Wall -O3 $(ALIGN) -funroll-loops -DPNG_NO_MMX_CODE \
+        -W -Wall -O3 $(ALIGN) -funroll-loops -DPNG_NO_MMX_CODE \
 	-fomit-frame-pointer) # $(WARNMORE) -g -DPNG_DEBUG=5

 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 SHAREDLIB=cygpng$(CYGDLL).dll
@@ -176,7 +179,7 @@ pngtest-stat$(EXE): pngtest.o $(STATLIB)
 pngtest.pic.o: pngtest.c
 	$(CC) $(CFLAGS) -c $< -o $@

-pngtest.o: pngtest.c
+pngtest.o: pngtest.c png.h pngconf.h
 	$(CC) $(CFLAGS) -c $< -o $@

 test: test-static test-shared
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -1,10 +1,13 @@
 # makefile for libpng on Darwin / Mac OS X
-# Copyright (C) 2002, 2004, 2006 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2004, 2006, 2008 Glenn Randers-Pehrson
 # Copyright (C) 2001 Christoph Pfisterer
 # derived from makefile.linux:
 #  Copyright (C) 1998, 1999 Greg Roelofs
 #  Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # where "make install" puts libpng.a, libpng12.dylib, png.h and pngconf.h
 prefix=/usr/local
@@ -18,8 +21,8 @@ ZLIBINC=../zlib

 # Library name:
 LIBNAME = libpng12
-PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMAJ = 12
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
@@ -38,8 +41,8 @@ LN_SF=ln -sf
 RANLIB=ranlib
 RM_F=/bin/rm -f

-# CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE
-CFLAGS=-I$(ZLIBINC) -Wall -O -funroll-loops
+# CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE
+CFLAGS=-I$(ZLIBINC) -W -Wall -O -funroll-loops
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz

 INCPATH=$(prefix)/include
@@ -104,7 +107,7 @@ $(LIBSOMAJ): $(LIBSOVER)
 $(LIBSOVER): $(OBJSDLL)
 	$(CC) -dynamiclib \
 	 -install_name $(LIBPATH)/$(LIBSOMAJ) \
-	 -current_version $(PNGVER) -compatibility_version $(PNGVER) \
+	 -current_version 0 -compatibility_version 0 \
 	 -o $(LIBSOVER) \
 	 $(OBJSDLL) -L$(ZLIBLIB) -lz

--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -1,11 +1,14 @@
 # makefile for libpng on DEC Alpha Unix
 # Copyright (C) 2000-2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12

@@ -205,10 +208,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h

+pngtest.o: png.h pngconf.h
--- a/scripts/makefile.dj2
+++ b/scripts/makefile.dj2
@@ -1,7 +1,10 @@
 # DJGPP (DOS gcc) makefile for libpng
-# Copyright (C) 2002 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2009 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # where make install will put libpng.a and png.h
 #prefix=/usr/local
@@ -47,9 +50,9 @@ pngread.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h

+pngtest.o: png.h pngconf.h
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -1,7 +1,11 @@
 # makefile for libpng.a and libpng12.so on Linux ELF with gcc
-# Copyright (C) 1998, 1999, 2002, 2006 Greg Roelofs and Glenn Randers-Pehrson
+# Copyright (C) 1998, 1999, 2002, 2006, 2008 Greg Roelofs
+# and Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Modified for Debian by Junichi Uekawa and Josselin Mouette
 # Major modifications are:
@@ -12,7 +16,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
@@ -53,7 +57,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \

 # for pgcc version 2.95.1, -O3 is buggy; don't use it.

-CFLAGS=-Wall -D_REENTRANT -O2 \
+CFLAGS=-W -Wall -D_REENTRANT -O2 \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5

 LDFLAGS=-L. -lpng12
--- a/scripts/makefile.freebsd
+++ b/scripts/makefile.freebsd
@@ -1,6 +1,9 @@
 # makefile for libpng under FreeBSD
-# Copyright (C) 2002, 2007 Glenn Randers-Pehrson and Andrey A. Chernov
-# For conditions of distribution and use, see copyright notice in png.h
+# Copyright (C) 2002, 2007, 2009 Glenn Randers-Pehrson and Andrey A. Chernov
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 PREFIX?=        /usr/local
 SHLIB_VER?=     5
--- a/scripts/makefile.gcc
+++ b/scripts/makefile.gcc
@@ -1,7 +1,11 @@
 # makefile for libpng using gcc (generic, static library)
+# Copyright (C) 2008 Glenn Randers-Pehrson
 # Copyright (C) 2000 Cosmin Truta
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Location of the zlib library and include files
 ZLIBINC = ../zlib
@@ -18,8 +22,8 @@ CDEBUG = -g -DPNG_DEBUG=5
 LDDEBUG =
 CRELEASE = -O2
 LDRELEASE = -s
-#CFLAGS = -Wall $(CDEBUG)
-CFLAGS = -Wall $(CRELEASE)
+#CFLAGS = -W -Wall $(CDEBUG)
+CFLAGS = -W -Wall $(CRELEASE)
 #LDFLAGS = $(LDDEBUG)
 LDFLAGS = $(LDRELEASE)
 LIBS = -lz -lm
@@ -30,9 +34,9 @@ A=.a
 EXE=

 # Variables
-OBJS = png$(O) pngerror$(O) pngget$(O) pngmem$(O) pngpread$(O) \
-       pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) pngset$(O) \
-       pngtrans$(O) pngwio$(O) pngwrite$(O) pngwtran$(O) pngwutil$(O)
+OBJS =  png$(O) pngerror$(O) pngget$(O) pngmem$(O) pngpread$(O) \
+	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) pngset$(O) \
+	pngtrans$(O) pngwio$(O) pngwrite$(O) pngwtran$(O) pngwutil$(O)

 # Targets
 all: static
@@ -60,20 +64,20 @@ pngtest$(EXE): pngtest$(O) libpng$(A)
 clean:
 	$(RM_F) *$(O) libpng$(A) pngtest$(EXE) pngout.png

-png$(O): png.h pngconf.h
+png$(O):      png.h pngconf.h
 pngerror$(O): png.h pngconf.h
-pngget$(O): png.h pngconf.h
-pngmem$(O): png.h pngconf.h
+pngget$(O):   png.h pngconf.h
+pngmem$(O):   png.h pngconf.h
 pngpread$(O): png.h pngconf.h
-pngread$(O): png.h pngconf.h
-pngrio$(O): png.h pngconf.h
+pngread$(O):  png.h pngconf.h
+pngrio$(O):   png.h pngconf.h
 pngrtran$(O): png.h pngconf.h
 pngrutil$(O): png.h pngconf.h
-pngset$(O): png.h pngconf.h
-pngtest$(O): png.h pngconf.h
+pngset$(O):   png.h pngconf.h
 pngtrans$(O): png.h pngconf.h
-pngwio$(O): png.h pngconf.h
+pngwio$(O):   png.h pngconf.h
 pngwrite$(O): png.h pngconf.h
 pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h

+pngtest$(O):  png.h pngconf.h
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -1,9 +1,12 @@
 # makefile for libpng.a and libpng12.so on Linux ELF with gcc using MMX
 # assembler code
-# Copyright 2002, 2006 Greg Roelofs and Glenn Randers-Pehrson
+# Copyright 2002, 2006, 2008 Greg Roelofs and Glenn Randers-Pehrson
 # Copyright 1998-2001 Greg Roelofs
 # Copyright 1996-1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # CAUTION: Do not use this makefile with gcc versions 2.7.2.2 and earlier.

@@ -14,7 +17,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
@@ -58,17 +61,17 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \

 # Remove -DPNG_THREAD_UNSAFE_OK if you need thread safety
 ### for generic gcc:
-CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -Wall -O \
+CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -W -Wall -O \
 	$(ALIGN) -funroll-loops \
 	-fomit-frame-pointer  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### for gcc 2.95.2 on 686:
-#CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -Wall -O \
+#CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -W -Wall -O \
 #	-mcpu=i686 -malign-double -ffast-math -fstrict-aliasing \
-#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer 
+#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer
 ### for gcc 2.7.2.3 on 486 and up:
-#CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -Wall -O \
+#CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -W -Wall -O \
 #	-m486 -malign-double -ffast-math \
-#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer 
+#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer

 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS_A=-L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) libpng.a -lz -lm
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -1,8 +1,11 @@
 # makefile for libpng, HPUX (10.20 and 11.00) using the ANSI/C product.
-# Copyright (C) 1999-2002 Glenn Randers-Pehrson
+# Copyright (C) 1999-2002, 2006, 2009 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Where the zlib library and include files are located
 ZLIBLIB=/opt/zlib/lib
@@ -18,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
@@ -227,9 +230,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -1,14 +1,17 @@
 # makefile for libpng on HP-UX using GCC with the HP ANSI/C linker.
-# Copyright (C) 2002, 2006, 2007 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006-2008 Glenn Randers-Pehrson
 # Copyright (C) 2001, Laurent faillie
 # Copyright (C) 1998, 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
@@ -53,7 +56,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \

 # for pgcc version 2.95.1, -O3 is buggy; don't use it.

-CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
+CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 #LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz -lm
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -2,7 +2,10 @@
 # Copyright (C) 1999-2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # Where the zlib library and include files are located
 ZLIBLIB=/opt/zlib/lib
@@ -18,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23
+PNGMIN = 1.2.41beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)

 # Shared library names:
@@ -224,9 +227,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h
--- a/scripts/makefile.ibmc
+++ b/scripts/makefile.ibmc
@@ -1,7 +1,12 @@
 # Makefile for libpng (static)
 # IBM C version 3.x for Win32 and OS/2
+# Copyright (C) 2006 Glenn Randers-Pehrson
 # Copyright (C) 2000 Cosmin Truta
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Notes:
 #   Derived from makefile.std
 #   All modules are compiled in C mode
@@ -53,19 +58,20 @@ clean:
 	$(RM) pngtest$(E)
 	$(RM) pngout.png

-png$(O): png.h pngconf.h
+png$(O):      png.h pngconf.h
 pngerror$(O): png.h pngconf.h
-pngget$(O): png.h pngconf.h
-pngmem$(O): png.h pngconf.h
+pngget$(O):   png.h pngconf.h
+pngmem$(O):   png.h pngconf.h
 pngpread$(O): png.h pngconf.h
-pngread$(O): png.h pngconf.h
-pngrio$(O): png.h pngconf.h
+pngread$(O):  png.h pngconf.h
+pngrio$(O):   png.h pngconf.h
 pngrtran$(O): png.h pngconf.h
 pngrutil$(O): png.h pngconf.h
-pngset$(O): png.h pngconf.h
-pngtest$(O): png.h pngconf.h
+pngset$(O):   png.h pngconf.h
 pngtrans$(O): png.h pngconf.h
-pngwio$(O): png.h pngconf.h
+pngwio$(O):   png.h pngconf.h
 pngwrite$(O): png.h pngconf.h
 pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h
+
+pngtest$(O):  png.h pngconf.h
--- a/scripts/makefile.intel
+++ b/scripts/makefile.intel
@@ -1,12 +1,17 @@
 # Makefile for libpng
 # Microsoft Visual C++ with Intel C/C++ Compiler 4.0 and later

+# Copyright (C) 2006 Glenn Randers-Pehrson
 # Copyright (C) 2000, Pawel Mrochen, based on makefile.msc which is
 # copyright 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # To use, do "nmake /f scripts\makefile.intel"

+# ------------------- Intel C/C++ Compiler 4.0 and later -------------------

 # Where the zlib library and include files are located
 ZLIBLIB=..\zlib
@@ -26,7 +31,6 @@ CALLING=r	# __fastcall

 # --------------------------------------------------------------------------

-
 CC=icl -c
 CFLAGS=-O2 -G$(CPU)$(CALLING) -Qip -Qunroll4 -I$(ZLIBINC) -nologo
 LD=link
@@ -73,9 +77,6 @@ pngrio$(O): png.h pngconf.h
 pngwio$(O): png.h pngconf.h
 	$(CC) $(CFLAGS) $*.c $(ERRFILE)

-pngtest$(O): png.h pngconf.h
-	$(CC) $(CFLAGS) $*.c $(ERRFILE)
-
 pngtrans$(O): png.h pngconf.h
 	$(CC) $(CFLAGS) $*.c $(ERRFILE)

@@ -95,6 +96,9 @@ libpng.lib: $(OBJS)
 pngtest.exe: pngtest.obj libpng.lib
 	$(LD) $(LDFLAGS) /OUT:pngtest.exe pngtest.obj libpng.lib $(ZLIBLIB)\zlib.lib

+pngtest$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
 test: pngtest.exe
 	pngtest.exe

--- a/scripts/makefile.knr
+++ b/scripts/makefile.knr
@@ -1,7 +1,10 @@
 # makefile for libpng
-# Copyright (C) 2002 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2009 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h

 # This makefile requires the file ansi2knr.c, which you can get
 # from the Ghostscript ftp site at ftp://ftp.cs.wisc.edu/ghost/
@@ -58,7 +61,7 @@ pngtest: pngtest.o libpng.a
 test: pngtest
 	./pngtest

-install: libpng.a
+install: libpng.a png.h pngconf.h
 	-@mkdir $(DESTDIR)$(INCPATH)
 	-@mkdir $(DESTDIR)$(INCPATH)/libpng
 	-@mkdir $(DESTDIR)$(LIBPATH)
@@ -92,8 +95,9 @@ pngread.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Glenn Randers-Pehrson	caaf688582	[master] Imported from libpng-1.2.41beta02.tar	2009-09-30 13:40:53 -05:00
Glenn Randers-Pehrson	3dfd0cd62a	[master] Add a test to make sure the user isn't trying to stuff height into a 16-bit int (assuming height immediately follows width).	2009-09-30 13:38:37 -05:00
Glenn Randers-Pehrson	18bd86f154	[master] Revise documentation to mention not using TAB character	2009-09-25 14:21:52 -05:00
Glenn Randers-Pehrson	338f465019	[master] Expand TAB characters in pngrtran.c	2009-09-25 14:11:33 -05:00
Glenn Randers-Pehrson	ac13f5e6f9	[master] Imported from libpng-1.2.41beta01.tar	2009-09-25 12:07:58 -05:00
Glenn Randers-Pehrson	1b6f6d80ea	[master] Imported from libpng-1.2.40.tar	2009-09-10 09:01:41 -05:00
Glenn Randers-Pehrson	18b078414a	[master] Imported from libpng-1.2.40rc01.tar	2009-09-02 07:09:11 -05:00
Glenn Randers-Pehrson	f6ce318061	[master] CMakeLists.txt updated with bugfixes and improvements	2009-08-28 07:06:45 -05:00
Glenn Randers-Pehrson	a21c94e3dc	[master] Bump version to libpng-1.2.40beta02	2009-08-22 09:26:42 -05:00
Glenn Randers-Pehrson	38b92d56e7	[master] Imported from libpng-1.2.40beta01.tar	2009-08-20 17:39:42 -05:00
Glenn Randers-Pehrson	a08d95b971	[master] Fixed incorrect #ifdef in pngset.c PNG_UNKNOWN_CHUNKS_SUPPORTED should be PNG_HANDLE_AS_UNKNOWN_SUPPORTED	2009-08-20 16:13:58 -05:00
Glenn Randers-Pehrson	339416b38b	[master] Trivial cosmetic changes in comments	2009-08-19 08:42:06 -05:00
Glenn Randers-Pehrson	7e2f07486a	[master] Remove an extra png_debug() statement that was recently added to png_write_find_filter() in pngwutil.c	2009-08-13 17:54:20 -05:00
Glenn Randers-Pehrson	a3e569cdda	[master] Bump libpng.3 and ANNOUNCE to version 1.2.40beta01	2009-08-13 17:52:49 -05:00
Glenn Randers-Pehrson	d68d8d82e6	[master] Bump version to libpng-1.2.40beta01	2009-08-13 17:41:35 -05:00
Glenn Randers-Pehrson	997b4a544d	[master] Update ANNOUNCE to mention .tar.xz instead of .tgz	2009-08-13 06:15:22 -05:00
Glenn Randers-Pehrson	176d2b622e	[master] Imported from libpng-1.2.39.tar	2009-08-13 05:51:34 -05:00
Glenn Randers-Pehrson	3a9ab23713	[master] Imported from libpng-1.2.39rc01.tar	2009-08-05 21:26:48 -05:00
Glenn Randers-Pehrson	9e88fcd58c	[master] Imported from libpng-1.2.39beta05.tar	2009-08-01 08:57:10 -05:00
Glenn Randers-Pehrson	39ffc1c3c7	[master] Imported from libpng-1.2.39beta04.tar	2009-08-01 08:57:08 -05:00
Glenn Randers-Pehrson	69d0e44295	[master] Imported from libpng-1.2.39beta03.tar	2009-07-29 05:50:25 -05:00
Glenn Randers-Pehrson	d2d5e540ac	[master] Update configure scripts to autoconf-2.64	2009-07-28 16:51:57 -05:00
Glenn Randers-Pehrson	d7bd2d2b2c	[master] Relocated prototype for png_64bit_product() into png.h and revised the documenatation (in the libpng style section) about placement of prototypes.	2009-07-28 08:18:31 -05:00
Glenn Randers-Pehrson	ddf5fc8a42	[master] Bump version to libpng-1.2.39beta03	2009-07-28 08:05:11 -05:00
Glenn Randers-Pehrson	0841c63e0d	[master] Imported from libpng-1.2.39beta02.tar	2009-07-27 22:31:10 -05:00
Glenn Randers-Pehrson	a4d439b975	[master] Avoid a possible NULL dereference in debug build, in png_set_text_2() (bug introduced in libpng-0.95, discovered by Evan Rouault)	2009-07-27 22:27:30 -05:00
Glenn Randers-Pehrson	8de509a837	[master] Bump version to libpng-1.2.39beta02	2009-07-27 22:26:15 -05:00
Glenn Randers-Pehrson	219760639a	[master] Imported from libpng-1.2.39beta01.tar	2009-07-25 09:27:58 -05:00
Glenn Randers-Pehrson	38ed8795ab	[master] Added a prototype for png_16bit_product() (suggested by Peter Breitenlohner)	2009-07-23 13:18:55 -05:00
Glenn Randers-Pehrson	55697d7dc9	[master] Update some dates.	2009-07-23 13:17:27 -05:00
Glenn Randers-Pehrson	a7fb782aea	[master] Bump version to libpng-1.2.39beta01	2009-07-23 13:01:03 -05:00
Glenn Randers-Pehrson	d91c64e428	[master] Imported from libpng-1.2.38.tar	2009-07-16 06:01:45 -05:00
Glenn Randers-Pehrson	4aa911abc6	[master] Imported from libpng-1.2.38rc03.tar	2009-07-11 09:16:28 -05:00
Glenn Randers-Pehrson glennrp@comcast.net	64c72bb919	[master] Updated configuration scripts to autoconf-2.63 from autoconf-2.62	2009-07-11 09:07:35 -05:00
Glenn Randers-Pehrson glennrp@comcast.net	fec191d3cc	[master] Revised references to libpng license in contrib/visupng to be consistent with the rest of the source files.	2009-07-11 07:13:56 -05:00
Glenn Randers-Pehrson	7430bcbc44	[master] Add a reference to the "libpng license" in each source file.	2009-06-28 21:38:35 -05:00
Glenn Randers-Pehrson	eba11d2ba5	[master] Imported from libpng-1.2.38rc02.tar	2009-06-28 20:28:53 -05:00
Glenn Randers-Pehrson	a3a724f805	[master] Imported from libpng-1.2.38rc01.tar	2009-06-24 06:59:36 -05:00
Glenn Randers-Pehrson	a770d71890	[master] Bump version to bump-to-libpng-1.2.38beta02	2009-06-18 16:53:56 -05:00
Glenn Randers-Pehrson	1de866cd09	[master] Imported from libpng-1.2.38beta01.tar	2009-06-17 07:46:44 -05:00
Glenn Randers-Pehrson	54380f53a2	[master] Fixed some indentation in pngset.c	2009-06-16 17:53:00 -05:00
Glenn Randers-Pehrson	7d870524d3	[master] Changed PNG_HANDLE_AS_UNKNOWN to PNG_UNKNOWN_CHUNKS_SUPPORTED in pngset.c	2009-06-16 17:28:01 -05:00
Glenn Randers-Pehrson	d28aad9a58	[master] Added an "#ifdef PNG_WRITE_SUPPORTED/#endif" block in pngconf.h	2009-06-16 17:27:14 -05:00
Glenn Randers-Pehrson	8be63adbc8	[master] Relocated various UNKNOWN_CHUNK macro definitions outside of the PNG_READ\|WRITE_ANCILLARY_CHUNK_SUPPORTED macros and updated CHANGES and ANNOUNCE. The definitions were actually relocated in the previous commit but I forgot to mention it.	2009-06-16 16:13:42 -05:00
Glenn Randers-Pehrson	7d8f352e0a	Added a PNG_NO_HANDLE_AS_UNKNOWN inside the LEGACY block of pngconf.h	2009-06-16 13:54:57 -05:00
Glenn Randers-Pehrson	587382c0ba	[master] Added 2 "defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)" tests in png.h	2009-06-16 13:35:47 -05:00
Glenn Randers-Pehrson	0f714ca6bc	[master] Reformatted some comments.	2009-06-15 22:01:39 -05:00
Glenn Randers-Pehrson	63da1df6fe	[master] png.c should have been included in the previous checkin	2009-06-15 20:58:37 -05:00
Glenn Randers-Pehrson	bbe589da44	[master] Change some instances of PNG_READ_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN to make it possible to build a libpng that can use the png_set_keep_unknown_chunks() mechanism to ignore unused chunks without having to save unknown chunks.	2009-06-15 20:50:00 -05:00
Glenn Randers-Pehrson	b278e91338	about calling png_set_IHDR() multiple times and about the order of color samples in the tRNS chunk.	2009-06-08 08:37:58 -05:00
Glenn Randers-Pehrson	f2609e133d	[master] Revise libpng*.txt about calling png_set_IHDR() multiple times and about the order of color samples in the tRNS chunk.	2009-06-08 08:33:46 -05:00
Glenn Randers-Pehrson	e14fdbbddb	[master] Bump version to bump-to-libpng-1.2.38beta01	2009-06-05 17:27:14 -05:00
Glenn Randers-Pehrson	a162155919	Imported from libpng-1.2.37.tar	2009-06-04 06:11:58 -05:00
Glenn Randers-Pehrson	4d7ae382a8	[master] Added a section in documentation about using png_set_io_ptr() in configure scripts for detecting libpng	2009-06-02 13:48:22 -05:00
Glenn Randers-Pehrson	0c86eb2dc7	Update pngminim/*/pngusr.h to add PNG_NO_READ_SWAP, PNG_NO_WRITE_SWAP	2009-06-02 06:50:00 -05:00
Glenn Randers-Pehrson	70c2db8b9f	Updated documentation about the git repository and libpng coding style.	2009-06-02 06:41:57 -05:00
Glenn Randers-Pehrson	c1dd118d2c	Reformatted several "if () statment;" and "else statement;" into two lines.	2009-05-30 20:25:20 -05:00
Glenn Randers-Pehrson	2d21d91abd	Imported from libpng-1.2.37rc01.tar	2009-05-27 06:47:59 -05:00
Glenn Randers-Pehrson	e5ee05dc0d	Imported from libpng-1.2.37beta03.tar	2009-05-20 17:19:00 -05:00
Glenn Randers-Pehrson	c0d53e176b	Change version from libpng-1.2.37rc01 to libpng-1.2.37beta03 Because of many cosmetic changes, drop back to beta and do rc01 later.	2009-05-20 17:16:46 -05:00
Glenn Randers-Pehrson	b26d188190	Rename contrib/pngminim/*/makefile.std to makefile.	2009-05-19 18:51:08 -05:00
Glenn Randers-Pehrson	0a6382e2af	Bump version to libpng-1.2.37rc01	2009-05-19 18:48:06 -05:00
Glenn Randers-Pehrson	1214d8cd26	Fix "AVE" -> "AVG" typo in libpng docs again. Evidently the fix didn't go into the real master copy.	2009-05-19 07:18:06 -05:00
Glenn Randers-Pehrson	65a30ab0a2	Imported from libpng-1.2.37beta02.tar	2009-05-19 07:05:20 -05:00
Glenn Randers-Pehrson	61616abef2	Fixed cut-and-paste error in contrib/pngminim/preader/README "pngminus" should be "gregbook"	2009-05-18 15:19:29 -05:00
Glenn Randers-Pehrson	bb1fcd1ba8	Fixed a glitch in contrib/pngminim/preader/README.	2009-05-18 14:57:07 -05:00
Glenn Randers-Pehrson	6d65121993	Add contrib/pngminim/preader files (README, gather.sh, makefile.std, and pngusr.h)	2009-05-18 14:50:48 -05:00
Glenn Randers-Pehrson	ecf0bffb79	Added contrib/pngminim/preader demo of gregbook/rpng2-x with embedded libpng also minor editing of encoder/pngusr.h and decoder/pngusr.h	2009-05-18 14:46:35 -05:00
Glenn Randers-Pehrson	af2ea0a1f2	Revise ANNOUNCE to reflect conditional compile of png_read_finish_row().	2009-05-18 14:43:36 -05:00
Glenn Randers-Pehrson	286467db82	Restored compiling png_combine_row() for progressive readers. Only png_read_finish_row() can be omitted.	2009-05-18 13:40:23 -05:00
Glenn Randers-Pehrson	6b60a31ebf	Restore png_memset() call This stuff should be handled in the APNG fork.	2009-05-18 11:55:55 -05:00
Glenn Randers-Pehrson	54028e5943	Revert "png_reset_prev_row" from png.h and pngrutil.c This should be handled in the APNG fork, not in libpng proper.	2009-05-18 11:49:19 -05:00
Glenn Randers-Pehrson	0c062e839d	Conditionally compile png_combine_row() and png_read_finish_row() which are only used by sequential PNG readers. This can save some resources in applications that only do progressive reading.	2009-05-18 10:31:21 -05:00
Glenn Randers-Pehrson	0fcbf05b6d	Revert "Set png_ptr->old_prev_row_size=0 to force prev_row to be cleared" This reverts commit `f4276c36c9`.	2009-05-18 10:18:00 -05:00
Glenn Randers-Pehrson	f4276c36c9	Set png_ptr->old_prev_row_size=0 to force prev_row to be cleared	2009-05-16 08:47:20 -05:00
Glenn Randers-Pehrson	ba05bddf92	Relocate misplaced #endif directives in pngwrite.c having to do with sCAL chunk handling	2009-05-16 08:40:25 -05:00
Glenn Randers-Pehrson glennrp@comcast.net	7a63d75a83	Fixed typo in libpng documentation: AVE filter should be AVG filter.	2009-05-15 20:56:43 -05:00
Glenn Randers-Pehrson glennrp@comcast.net	da3f74a70e	Bump version to libpng-1.2.37beta02	2009-05-15 20:53:04 -05:00
Glenn Randers-Pehrson	5f26656fc5	Imported from libpng-1.2.37beta01.tar	2009-05-14 05:23:07 -05:00
Glenn Randers-Pehrson	2f76e90d1a	Reformatted comments in example.c Added advice about setting pointers to NULL after png_free(), capitalized sentences, reformatted long comments in libpng style.	2009-05-13 15:20:53 -05:00
Glenn Randers-Pehrson	1296329f02	Revised commentary in example.c	2009-05-13 07:42:05 -05:00
Glenn Randers-Pehrson	e38b432846	Clarified usage of sig_bit as struct vs sig_bit_p as pointer in example.c sig_bit was not declared in write_png() and was used differently from sig_bit in read_png(), as reported by Vincent Torri. This update changes sig_bit to sig_bit_p in read_png() and declares sig_bit in write_png().	2009-05-13 05:18:48 -05:00
Glenn Randers-Pehrson	549a5101e7	Fixed inconsistency in use of "row_bytes" in pngrutil.c The memset() should use "row_bytes" instead of "png_ptr->rowbytes". This bug was introduced in libpng-1.2.36.	2009-05-12 05:49:10 -05:00
Glenn Randers-Pehrson glennrp@comcast.net	031a8648cb	Merged scripts/makefiles and other scripts with libpng-1.4.0beta57. These are mostly just cosmetic changes.	2009-05-07 17:12:33 -05:00
Glenn Randers-Pehrson glennrp@comcast.net	a8476a8404	Bump internal version to libpng-1.2.37beta01.	2009-05-07 17:09:14 -05:00
Glenn Randers-Pehrson	25c8491fc8	Imported from libpng-1.2.36.tar	2009-05-07 10:59:02 -05:00
Glenn Randers-Pehrson	d0d637dd47	Imported from libpng-1.2.36rc01.tar	2009-04-30 15:29:29 -05:00
Glenn Randers-Pehrson	977c6bd44c	Imported from libpng-1.2.36beta05.tar	2009-04-24 15:09:41 -05:00
Glenn Randers-Pehrson	89ad3aa168	Suppress "shadowed declaration" warnings about "gamma" in pngset.c The variable "gamma" is also defined in math.h on some platforms.	2009-04-20 13:23:24 -05:00
Glenn Randers-Pehrson	55b921dab2	Suppress "shadowed declaration" warnings in pngtest.c Changed some local variable names such as "buffer" to "buff".	2009-04-20 13:12:07 -05:00
Glenn Randers-Pehrson	92d0fe938f	Add PNG_SKIP_SETJMP_CHECK macro	2009-04-20 13:07:01 -05:00
Glenn Randers-Pehrson	d07e9b03c4	Bump versioning to 1.2.36beta05	2009-04-20 13:02:18 -05:00
Glenn Randers-Pehrson	6cbd1cba68	Imported from libpng-1.2.36beta04.tar	2009-04-06 16:18:42 -05:00
Glenn Randers-Pehrson	3b8df1f143	Imported from libpng-1.2.36beta03.tar	2009-04-06 16:18:40 -05:00
Glenn Randers-Pehrson	85f7d0a8d5	Imported from libpng-1.2.36beta02.tar	2009-04-06 16:18:37 -05:00
Glenn Randers-Pehrson	556450a2ff	Imported from libpng-1.2.36beta01.tar	2009-04-06 16:18:34 -05:00
Glenn Randers-Pehrson	6048b12510	Imported from libpng-1.2.35.tar	2009-04-06 16:18:32 -05:00
Glenn Randers-Pehrson	8cafc1e1ac	Imported from libpng-1.2.35rc02.tar	2009-04-06 16:18:30 -05:00
Glenn Randers-Pehrson	51807d7608	Imported from libpng-1.2.35rc01.tar	2009-04-06 16:18:28 -05:00
Glenn Randers-Pehrson	e104df5bb7	Imported from libpng-1.2.35beta03.tar	2009-04-06 16:18:26 -05:00
Glenn Randers-Pehrson	c6df7e5899	Imported from libpng-1.2.35beta02.tar	2009-04-06 16:18:23 -05:00
Glenn Randers-Pehrson	d0a4300dde	Imported from libpng-1.2.35beta01.tar	2009-04-06 16:18:21 -05:00
Glenn Randers-Pehrson	d8865433f9	Imported from libpng-1.2.34.tar	2009-04-06 16:18:19 -05:00
Glenn Randers-Pehrson	9c2bd642ba	Imported from libpng-1.2.34rc01.tar	2009-04-06 16:18:17 -05:00
Glenn Randers-Pehrson	09883db208	Imported from libpng-1.2.34beta07.tar	2009-04-06 16:18:14 -05:00
Glenn Randers-Pehrson	f7f68f7160	Imported from libpng-1.2.34beta06.tar	2009-04-06 16:18:12 -05:00
Glenn Randers-Pehrson	31f744a8c0	Imported from libpng-1.2.34beta05.tar	2009-04-06 16:18:10 -05:00
Glenn Randers-Pehrson	bc66c96275	Imported from libpng-1.2.34beta04.tar	2009-04-06 16:18:07 -05:00
Glenn Randers-Pehrson	87c2acdeae	Imported from libpng-1.2.34beta03.tar	2009-04-06 16:18:05 -05:00
Glenn Randers-Pehrson	6b90023764	Imported from libpng-1.2.34beta02.tar	2009-04-06 16:18:02 -05:00
Glenn Randers-Pehrson	e502bca962	Imported from libpng-1.2.34beta01.tar	2009-04-06 16:18:00 -05:00
Glenn Randers-Pehrson	c4d44b72e8	Imported from libpng-1.2.33.tar	2009-04-06 16:17:58 -05:00
Glenn Randers-Pehrson	e7324bb94f	Imported from libpng-1.2.33rc02.tar	2009-04-06 16:17:56 -05:00
Glenn Randers-Pehrson	8431b2c190	Imported from libpng-1.2.33rc01.tar	2009-04-06 16:17:53 -05:00
Glenn Randers-Pehrson	7d376ccd8c	Imported from libpng-1.2.33beta01.tar	2009-04-06 16:17:51 -05:00
Glenn Randers-Pehrson	382410249d	Imported from libpng-1.2.32.tar	2009-04-06 16:17:49 -05:00
Glenn Randers-Pehrson	bfb5132362	Imported from libpng-1.2.32rc01.tar	2009-04-06 16:17:47 -05:00
Glenn Randers-Pehrson	4489dbc630	Imported from libpng-1.2.32beta01.tar	2009-04-06 16:17:45 -05:00
Glenn Randers-Pehrson	5c31bc8ffc	Imported from libpng-1.2.31.tar	2009-04-06 16:17:42 -05:00
Glenn Randers-Pehrson	baee5f46cf	Imported from libpng-1.2.31rc03.tar	2009-04-06 16:17:40 -05:00
Glenn Randers-Pehrson	66ab7ffa15	Imported from libpng-1.2.31rc02.tar	2009-04-06 16:17:37 -05:00
Glenn Randers-Pehrson	32df7eb346	Imported from libpng-1.2.31rc01.tar	2009-04-06 16:17:35 -05:00
Glenn Randers-Pehrson	576b532b45	Imported from libpng-1.2.30.tar	2009-04-06 16:17:33 -05:00
Glenn Randers-Pehrson	b520414d5a	Imported from libpng-1.2.30rc08.tar	2009-04-06 16:17:31 -05:00
Glenn Randers-Pehrson	b54fd5c588	Imported from libpng-1.2.30rc07.tar	2009-04-06 16:17:28 -05:00
Glenn Randers-Pehrson	d9b4c01719	Imported from libpng-1.2.30rc06.tar	2009-04-06 16:17:26 -05:00
Glenn Randers-Pehrson	84d5d968a6	Imported from libpng-1.2.30rc05.tar	2009-04-06 16:17:24 -05:00
Glenn Randers-Pehrson	9c8717e42f	Imported from libpng-1.2.30rc04.tar	2009-04-06 16:17:21 -05:00
Glenn Randers-Pehrson	3215e97b17	Imported from libpng-1.2.30rc03.tar	2009-04-06 16:17:19 -05:00
Glenn Randers-Pehrson	975e721432	Imported from libpng-1.2.30rc02.tar	2009-04-06 16:17:17 -05:00
Glenn Randers-Pehrson	b8bccdd081	Imported from libpng-1.2.30rc01.tar	2009-04-06 16:17:15 -05:00
Glenn Randers-Pehrson	4310a4d813	Imported from libpng-1.2.30beta04.tar	2009-04-06 16:17:12 -05:00
Glenn Randers-Pehrson	b96b342561	Imported from libpng-1.2.30beta03.tar	2009-04-06 16:17:10 -05:00
Glenn Randers-Pehrson	eb1cd11d57	Imported from libpng-1.2.30beta02.tar	2009-04-06 16:17:07 -05:00
Glenn Randers-Pehrson	a55c72890d	Imported from libpng-1.2.30beta01.tar	2009-04-06 16:17:05 -05:00
Glenn Randers-Pehrson	247e230581	Imported from libpng-1.2.29.tar	2009-04-06 16:17:03 -05:00
Glenn Randers-Pehrson	1586ea6fe9	Imported from libpng-1.2.29rc01.tar	2009-04-06 16:17:01 -05:00
Glenn Randers-Pehrson	ae505c50b0	Imported from libpng-1.2.29beta03.tar	2009-04-06 16:16:58 -05:00
Glenn Randers-Pehrson	fce1b4b1fb	Imported from libpng-1.2.29beta02.tar	2009-04-06 16:16:55 -05:00
Glenn Randers-Pehrson	c6bcbf4951	Imported from libpng-1.2.29beta01.tar	2009-04-06 16:16:53 -05:00
Glenn Randers-Pehrson	6ed6086da5	Imported from libpng-1.2.28.tar	2009-04-06 16:16:51 -05:00
Glenn Randers-Pehrson	9f7b16ad19	Imported from libpng-1.2.27.tar	2009-04-06 16:16:49 -05:00
Glenn Randers-Pehrson	fc70a92071	Imported from libpng-1.2.27rc01.tar	2009-04-06 16:16:46 -05:00
Glenn Randers-Pehrson	ccaaab2898	Imported from libpng-1.2.27beta06.tar	2009-04-06 16:16:43 -05:00
Glenn Randers-Pehrson	8d36e630f2	Imported from libpng-1.2.27beta05.tar	2009-04-06 16:16:41 -05:00
Glenn Randers-Pehrson	eb1f347bca	Imported from libpng-1.2.27beta04.tar	2009-04-06 16:16:38 -05:00
Glenn Randers-Pehrson	7db798186c	Imported from libpng-1.2.27beta03.tar	2009-04-06 16:16:36 -05:00
Glenn Randers-Pehrson	a1cd94bfbb	Imported from libpng-1.2.27beta02.tar	2009-04-06 16:16:34 -05:00
Glenn Randers-Pehrson	d9d2a6f6d9	Imported from libpng-1.2.27beta01.tar	2009-04-06 16:16:31 -05:00
Glenn Randers-Pehrson	b8c4b82d18	Imported from libpng-1.2.26.tar	2009-04-06 16:16:29 -05:00
Glenn Randers-Pehrson	b8f615d7a1	Imported from libpng-1.2.26rc01.tar	2009-04-06 16:16:27 -05:00
Glenn Randers-Pehrson	35d97eb5c5	Imported from libpng-1.2.26beta06.tar	2009-04-06 16:16:24 -05:00
Glenn Randers-Pehrson	fc15b2e479	Imported from libpng-1.2.26beta05.tar	2009-04-06 16:16:22 -05:00
Glenn Randers-Pehrson	936df0d290	Imported from libpng-1.2.26beta04.tar	2009-04-06 16:16:20 -05:00
Glenn Randers-Pehrson	3236beddf8	Imported from libpng-1.2.26beta03.tar	2009-04-06 16:16:18 -05:00
Glenn Randers-Pehrson	c13f8f10e6	Imported from libpng-1.2.26beta02.tar	2009-04-06 16:16:15 -05:00
Glenn Randers-Pehrson	d8b530b93c	Imported from libpng-1.2.26beta01.tar	2009-04-06 16:16:13 -05:00
Glenn Randers-Pehrson	2296f211e8	Imported from libpng-1.2.25.tar	2009-04-06 16:16:10 -05:00
Glenn Randers-Pehrson	a5136b8863	Imported from libpng-1.2.25rc02.tar	2009-04-06 16:16:08 -05:00
Glenn Randers-Pehrson	913bc38217	Imported from libpng-1.2.25beta06.tar	2009-04-06 16:16:05 -05:00
Glenn Randers-Pehrson	4b7dca3d2c	Imported from libpng-1.2.25beta05.tar	2009-04-06 16:16:03 -05:00
Glenn Randers-Pehrson	5c58e3ee31	Imported from libpng-1.2.25beta04.tar	2009-04-06 16:16:00 -05:00
Glenn Randers-Pehrson	49f304bd07	Imported from libpng-1.2.25beta03.tar	2009-04-06 16:15:58 -05:00
Glenn Randers-Pehrson	c95be42221	Imported from libpng-1.2.25rc01.tar	2009-04-06 16:15:56 -05:00
Glenn Randers-Pehrson	dbc07e13bb	Imported from libpng-1.2.25beta02.tar	2009-04-06 16:15:54 -05:00
Glenn Randers-Pehrson	5ca40ebc22	Imported from libpng-1.2.25beta01.tar	2009-04-06 16:15:51 -05:00
Glenn Randers-Pehrson	a8e07274ae	Imported from libpng-1.2.24.tar	2009-04-06 16:15:49 -05:00
Glenn Randers-Pehrson	af99dba018	Imported from libpng-1.2.24rc01.tar	2009-04-06 16:15:46 -05:00
Glenn Randers-Pehrson	03dfa028d2	Imported from libpng-1.2.24beta02.tar	2009-04-06 16:15:44 -05:00
Glenn Randers-Pehrson	541b47ac2a	Imported from libpng-1.2.24beta01.tar	2009-04-06 16:15:42 -05:00