[libpng16] Bump version to 1.6.0beta12
diff --git a/ANNOUNCE b/ANNOUNCE
index 1d3110b..0bb5e29 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.6.0beta11 - February 17, 2012
+Libpng 1.6.0beta12 - February 17, 2012
 
 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.
@@ -9,20 +9,20 @@
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.0beta11.tar.xz (LZMA-compressed, recommended)
-   1.6.0beta11.tar.gz
-   1.6.0beta11.tar.bz2
+   1.6.0beta12.tar.xz (LZMA-compressed, recommended)
+   1.6.0beta12.tar.gz
+   1.6.0beta12.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp160b11.7z  (LZMA-compressed, recommended)
-   lp160b11.zip
+   lp160b12.7z  (LZMA-compressed, recommended)
+   lp160b12.zip
 
 Other information:
 
-   1.6.0beta11-README.txt
-   1.6.0beta11-LICENSE.txt
+   1.6.0beta12-README.txt
+   1.6.0beta12-LICENSE.txt
 
 Changes since the last public release (1.5.7):
 
@@ -167,7 +167,7 @@
   Updated INSTALL to explain that autogen.sh must be run in a GIT clone,
     not in a libpng directory extracted from a tar distribution.
 
-Version 1.6.0beta09 [February 1, 2011]
+Version 1.6.0beta09 [February 1, 2012]
   Reverted the prebuilt configure files to libpng-1.6.0beta05 condition.
 
 Version 1.6.0beta10 [February 3, 2012]
@@ -176,7 +176,7 @@
   Updated the prebuilt configure files to current condition.
   Revised INSTALL information about autogen.sh; it works in tar distributions.
 
-Version 1.6.0beta11 [February 17, 2012]
+Version 1.6.0beta11 [February 16, 2012]
   Fix character count in pngstest command in projects/owatcom/pngstest.tgt
   Revised test-pngstest.sh to report PASS/FAIL for each image.
   Updated documentation about the simplified API.
@@ -211,6 +211,8 @@
     found, issue a warning and increase png_ptr->num_palette accordingly.
     Apps are responsible for checking to see if that happened.
 
+Version 1.6.0beta12 [February 17, 2012]
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/CHANGES b/CHANGES
index ee5b5ef..97063ac 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3927,7 +3927,7 @@
   Updated the prebuilt configure files to current condition.
   Revised INSTALL information about autogen.sh; it works in tar distributions.
 
-Version 1.6.0beta11 [February 17, 2012]
+Version 1.6.0beta11 [February 16, 2012]
   Fix character count in pngstest command in projects/owatcom/pngstest.tgt
   Revised test-pngstest.sh to report PASS/FAIL for each image.
   Updated documentation about the simplified API.
@@ -3962,6 +3962,8 @@
     found, issue a warning and increase png_ptr->num_palette accordingly.
     Apps are responsible for checking to see if that happened.
 
+Version 1.6.0beta12 [February 17, 2012]
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 57f90cb..b7011ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -260,7 +260,7 @@
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 16.${PNGLIB_RELEASE}.1.6.0beta11
+#   VERSION 16.${PNGLIB_RELEASE}.1.6.0beta12
     VERSION 16.${PNGLIB_RELEASE}.0
     SOVERSION 16
     CLEAN_DIRECT_OUTPUT 1)
diff --git a/LICENSE b/LICENSE
index def4b5b..39783b1 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.0beta11, February 17, 2012, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.0beta12, February 17, 2012, are
 Copyright (c) 2004, 2006-2011 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
diff --git a/README b/README
index fe41af8..cacc546 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.6.0beta11 - February 17, 2012 (shared library 16.0)
+README for libpng version 1.6.0beta12 - February 17, 2012 (shared library 16.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
diff --git a/configure.ac b/configure.ac
index dfc9067..7b3a3bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.0beta11],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.6.0beta12],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -37,7 +37,7 @@
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake
 
-PNGLIB_VERSION=1.6.0beta11
+PNGLIB_VERSION=1.6.0beta12
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=0
diff --git a/libpng-manual.txt b/libpng-manual.txt
index 47ba62f..2d4089b 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.0beta11 - February 17, 2012
+ libpng version 1.6.0beta12 - February 17, 2012
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.0beta11 - February 17, 2012
+ libpng versions 0.97, January 1998, through 1.6.0beta12 - February 17, 2012
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -4985,7 +4985,7 @@
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.0beta11 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.0beta12 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
diff --git a/libpng.3 b/libpng.3
index 6ac62b9..77b4e30 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
 .TH LIBPNG 3 "February 17, 2012"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.0beta11
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.0beta12
 .SH SYNOPSIS
 \fI\fB
 
@@ -1003,7 +1003,7 @@
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.0beta11 - February 17, 2012
+ libpng version 1.6.0beta12 - February 17, 2012
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -1014,7 +1014,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.0beta11 - February 17, 2012
+ libpng versions 0.97, January 1998, through 1.6.0beta12 - February 17, 2012
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -5989,7 +5989,7 @@
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.0beta11 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.0beta12 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
@@ -6194,7 +6194,7 @@
  1.5.7beta01-05      15    10507  15.so.15.7[.0]
  1.5.7rc01-03        15    10507  15.so.15.7[.0]
  1.5.7               15    10507  15.so.15.7[.0]
- 1.6.0beta01-11      16    10600  16.so.16.0[.0]
+ 1.6.0beta01-12      16    10600  16.so.16.0[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -6251,7 +6251,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.6.0beta11 - February 17, 2012:
+Libpng version 1.6.0beta12 - February 17, 2012:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6274,7 +6274,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.0beta11, February 17, 2012, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.0beta12, February 17, 2012, are
 Copyright (c) 2004,2006-2007 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
diff --git a/libpngpf.3 b/libpngpf.3
index 5353460..6cb27a3 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
 .TH LIBPNGPF 3 "February 17, 2012"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.0beta11
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.0beta12
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"
diff --git a/png.c b/png.c
index 4e3d3e3..97adc74 100644
--- a/png.c
+++ b/png.c
@@ -14,7 +14,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_0beta11 Your_png_h_is_not_version_1_6_0beta11;
+typedef png_libpng_version_1_6_0beta12 Your_png_h_is_not_version_1_6_0beta12;
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
  * of the PNG file signature.  If the PNG data is embedded into another
@@ -762,13 +762,13 @@
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.6.0beta11 - February 17, 2012" PNG_STRING_NEWLINE \
+     "libpng version 1.6.0beta12 - February 17, 2012" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2012 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.6.0beta11 - February 17, 2012\
+      return "libpng version 1.6.0beta12 - February 17, 2012\
       Copyright (c) 1998-2012 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
diff --git a/png.h b/png.h
index c872949..413b9bb 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.0beta11 - February 17, 2012
+ * libpng version 1.6.0beta12 - February 17, 2012
  * Copyright (c) 1998-2012 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.)
@@ -11,7 +11,7 @@
  * 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 1.6.0beta11 - February 17, 2012: Glenn
+ *   libpng versions 0.97, January 1998, through 1.6.0beta12 - February 17, 2012: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -166,7 +166,7 @@
  *    1.5.7beta01-05          15    10507  15.so.15.7[.0]
  *    1.5.7rc01-03            15    10507  15.so.15.7[.0]
  *    1.5.7                   15    10507  15.so.15.7[.0]
- *    1.6.0beta01-11          16    10600  16.so.16.0[.0]
+ *    1.6.0beta01-12          16    10600  16.so.16.0[.0]
  *
  *   Henceforth the source version will match the shared-library major
  *   and minor numbers; the shared-library major version number will be
@@ -198,7 +198,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.6.0beta11, February 17, 2012, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.6.0beta12, February 17, 2012, are
  * Copyright (c) 2004, 2006-2012 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:
@@ -316,7 +316,7 @@
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.6.0beta11 are Y2K compliant.  It is my belief that
+ *    upward through 1.6.0beta12 are Y2K compliant.  It is my belief that
  *    earlier versions were also Y2K compliant.
  *
  *    Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -374,9 +374,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.0beta11"
+#define PNG_LIBPNG_VER_STRING "1.6.0beta12"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.6.0beta11 - February 17, 2012\n"
+     " libpng version 1.6.0beta12 - February 17, 2012\n"
 
 #define PNG_LIBPNG_VER_SONUM   16
 #define PNG_LIBPNG_VER_DLLNUM  16
@@ -390,7 +390,7 @@
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  11
+#define PNG_LIBPNG_VER_BUILD  12
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -520,7 +520,7 @@
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char* png_libpng_version_1_6_0beta11;
+typedef char* png_libpng_version_1_6_0beta12;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *
diff --git a/pngconf.h b/pngconf.h
index 612c8e4..18f3c79 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.6.0beta11 - February 17, 2012
+ * libpng version 1.6.0beta12 - February 17, 2012
  *
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngtest.c b/pngtest.c
index 1073a79..83129c5 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1659,4 +1659,4 @@
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_0beta11 Your_png_h_is_not_version_1_6_0beta11;
+typedef png_libpng_version_1_6_0beta12 Your_png_h_is_not_version_1_6_0beta12;
diff --git a/projects/vstudio/readme.txt b/projects/vstudio/readme.txt
index 0d64b20..cc09f5f 100644
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.6.0beta11 - February 17, 2012
+libpng version 1.6.0beta12 - February 17, 2012
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 
diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props
index 392fb6e..ebfecde 100644
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.6.0beta11 - February 17, 2012
+ * libpng version 1.6.0beta12 - February 17, 2012
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
diff --git a/scripts/README.txt b/scripts/README.txt
index 306b150..3e0baea 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,9 +1,9 @@
 
-Makefiles for  libpng version 1.6.0beta11 - February 17, 2012
+Makefiles for  libpng version 1.6.0beta12 - February 17, 2012
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng16.so.16.1.6.0beta11)
+                       (gcc, creates libpng16.so.16.1.6.0beta12)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -20,7 +20,7 @@
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       (gcc, creates libpng16.so.16.1.6.0beta11)
+                       (gcc, creates libpng16.so.16.1.6.0beta12)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.hpgcc    =>  HPUX makefile using gcc
@@ -35,12 +35,12 @@
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires libpng.def)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng16.so.16.1.6.0beta11)
+                       creates libpng16.so.16.1.6.0beta12)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng16.so.16.1.6.0beta11)
+                       creates libpng16.so.16.1.6.0beta12)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng16.so.16.1.6.0beta11)
+                       creates libpng16.so.16.1.6.0beta12)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 886b441..4e41b4d 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.6.0beta11
+version=1.6.0beta12
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 740949b..ba9ef1b 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.6.0beta11
+Version: 1.6.0beta12
 Libs: -L${libdir} -lpng16
 Cflags: -I${includedir}
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index edb21f1..b423b69 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@
 
 LIB=	png16
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.6.0beta11
+SHLIB_MINOR=	1.6.0beta12
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index e6491d0..d479e83 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@
 
 LIB=	png
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.0beta11
+SHLIB_MINOR=	1.6.0beta12
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index 52d8710..3f4e035 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.0beta11
+SHLIB_MINOR=	1.6.0beta12
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index 8537ecc..b97f91b 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -3,7 +3,7 @@
 
 /* pnglibconf.h - library build configuration */
 
-/* Libpng 1.6.0beta11 - February 17, 2012 */
+/* Libpng 1.6.0beta12 - February 17, 2012 */
 
 /* Copyright (c) 1998-2012 Glenn Randers-Pehrson */
 
diff --git a/scripts/symbols.def b/scripts/symbols.def
index 17e2822..da14258 100644
--- a/scripts/symbols.def
+++ b/scripts/symbols.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.6.0beta11
+;Version 1.6.0beta12
  png_access_version_number @1
  png_set_sig_bytes @2
  png_sig_cmp @3