[devel] Bump to version libpng-1.5.0rc02

ANNOUNCE

 
-Libpng 1.5.0rc01 - December 27, 2010
+Libpng 1.5.0rc02 - December 27, 2010
 
 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 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.5.0rc01.tar.xz (LZMA-compressed, recommended)
-   1.5.0rc01.tar.gz
-   1.5.0rc01.tar.bz2
+   1.5.0rc02.tar.xz (LZMA-compressed, recommended)
+   1.5.0rc02.tar.gz
+   1.5.0rc02.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp150r01.7z  (LZMA-compressed, recommended)
-   lp150r01.zip
+   lp150r02.7z  (LZMA-compressed, recommended)
+   lp150r02.zip
 
 Other information:
 
-   1.5.0rc01-README.txt
-   1.5.0rc01-LICENSE.txt
+   1.5.0rc02-README.txt
+   1.5.0rc02-LICENSE.txt
 
 Changes since the last public release (1.4.1):
 

CMakeLists.txt

@@ -261,7 +261,7 @@ install(CODE ${PNG_CONFIG_INSTALL_CODE})
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 15.${PNGLIB_RELEASE}.1.5.0rc01
+#   VERSION 15.${PNGLIB_RELEASE}.1.5.0rc02
     VERSION 15.${PNGLIB_RELEASE}.0
     SOVERSION 15
     CLEAN_DIRECT_OUTPUT 1)

LICENSE

@@ -10,7 +10,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.5.0rc01, December 27, 2010, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.0rc02, December 27, 2010, are
 Copyright (c) 2004, 2006-2010 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

README

-README for libpng version 1.5.0rc01 - December 27, 2010 (shared library 15.0)
+README for libpng version 1.5.0rc02 - December 27, 2010 (shared library 15.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.

configure

 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.68 for libpng-1.5.0rc01
+# Generated by GNU Autoconf 2.68 for libpng-1.5.0rc02
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -570,8 +570,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.5.0rc01'
-PACKAGE_STRING='1.5.0rc01'
+PACKAGE_VERSION='1.5.0rc02'
+PACKAGE_STRING='1.5.0rc02'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1306,7 +1306,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures libpng 1.5.0rc01 to adapt to many kinds of systems.
+\`configure' configures libpng 1.5.0rc02 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1376,7 +1376,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.5.0rc01:";;
+     short | recursive ) echo "Configuration of libpng 1.5.0rc02:";;
    esac
   cat <<\_ACEOF
 
@@ -1484,7 +1484,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.5.0rc01
+libpng configure 1.5.0rc02
 generated by GNU Autoconf 2.68
 
 Copyright (C) 2010 Free Software Foundation, Inc.
@@ -1907,7 +1907,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by libpng $as_me 1.5.0rc01, which was
+It was created by libpng $as_me 1.5.0rc02, which was
 generated by GNU Autoconf 2.68.  Invocation command line was
 
   $ $0 $@
@@ -2722,7 +2722,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.5.0rc01'
+ VERSION='1.5.0rc02'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2786,7 +2786,7 @@ fi
 
 
 
-PNGLIB_VERSION=1.5.0rc01
+PNGLIB_VERSION=1.5.0rc02
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
 PNGLIB_RELEASE=0
@@ -12993,7 +12993,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by libpng $as_me 1.5.0rc01, which was
+This file was extended by libpng $as_me 1.5.0rc02, which was
 generated by GNU Autoconf 2.68.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -13059,7 +13059,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-libpng config.status 1.5.0rc01
+libpng config.status 1.5.0rc02
 configured by $0, generated by GNU Autoconf 2.68,
   with options \\"\$ac_cs_config\\"
 

configure.ac

@@ -18,12 +18,12 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.5.0rc01], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.5.0rc02], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.5.0rc01
+PNGLIB_VERSION=1.5.0rc02
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
 PNGLIB_RELEASE=0

libpng-manual.txt

 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.0rc01 - December 27, 2010
+ libpng version 1.5.0rc02 - December 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2010 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.0rc01 - December 27, 2010
+ libpng versions 0.97, January 1998, through 1.5.0rc02 - December 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2010 Glenn Randers-Pehrson
 
@@ -1050,7 +1050,7 @@ 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.
 
-As of libpng version 1.5.0rc01, not all possible expansions are supported.
+As of libpng version 1.5.0rc02, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -3816,7 +3816,7 @@ 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 1.5.0rc01 are Y2K compliant.  It is my belief that earlier
+upward through 1.5.0rc02 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

libpng.3

 .TH LIBPNG 3 "December 27, 2010"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.0rc01
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.0rc02
 .SH SYNOPSIS
 \fI\fB
 
@@ -851,7 +851,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.0rc01 - December 27, 2010
+ libpng version 1.5.0rc02 - December 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2010 Glenn Randers-Pehrson
@@ -862,7 +862,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.0rc01 - December 27, 2010
+ libpng versions 0.97, January 1998, through 1.5.0rc02 - December 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2010 Glenn Randers-Pehrson
 
@@ -1901,7 +1901,7 @@ 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.
 
-As of libpng version 1.5.0rc01, not all possible expansions are supported.
+As of libpng version 1.5.0rc02, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -4667,7 +4667,7 @@ 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 1.5.0rc01 are Y2K compliant.  It is my belief that earlier
+upward through 1.5.0rc02 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
@@ -4905,7 +4905,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.5.0rc01 - December 27, 2010:
+Libpng version 1.5.0rc02 - December 27, 2010:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -4928,7 +4928,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.5.0rc01, December 27, 2010, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.0rc02, December 27, 2010, 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

libpngpf.3

 .TH LIBPNGPF 3 "December 27, 2010"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.0rc01
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.0rc02
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"

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_5_0rc01 Your_png_h_is_not_version_1_5_0rc01;
+typedef png_libpng_version_1_5_0rc02 Your_png_h_is_not_version_1_5_0rc02;
 
 /* 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
@@ -555,13 +555,13 @@ png_get_copyright(png_structp png_ptr)
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.5.0rc01 - December 27, 2010" PNG_STRING_NEWLINE \
+     "libpng version 1.5.0rc02 - December 27, 2010" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2010 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 1.5.0rc01 - December 27, 2010\
+      return "libpng version 1.5.0rc02 - December 27, 2010\
       Copyright (c) 1998-2010 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";

png.h

 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.5.0rc01 - December 27, 2010
+ * libpng version 1.5.0rc02 - December 27, 2010
  * Copyright (c) 1998-2010 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 1.5.0rc01 - December 27, 2010: Glenn
+ *   libpng versions 0.97, January 1998, through 1.5.0rc02 - December 27, 2010: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -174,7 +174,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.5.0rc01, December 27, 2010, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.0rc02, December 27, 2010, are
  * Copyright (c) 2004, 2006-2010 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:
@@ -292,7 +292,7 @@
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.5.0rc01 are Y2K compliant.  It is my belief that
+ *    upward through 1.5.0rc02 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
@@ -348,9 +348,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.5.0rc01"
+#define PNG_LIBPNG_VER_STRING "1.5.0rc02"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.5.0rc01 - December 27, 2010\n"
+     " libpng version 1.5.0rc02 - December 27, 2010\n"
 
 #define PNG_LIBPNG_VER_SONUM   15
 #define PNG_LIBPNG_VER_DLLNUM  15
@@ -363,7 +363,7 @@
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  01
+#define PNG_LIBPNG_VER_BUILD  02
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -505,7 +505,7 @@ extern "C" {
 /* 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_5_0rc01;
+typedef char* png_libpng_version_1_5_0rc02;
 
 /* Three color definitions.  The order of the red, green, and blue, (and the
  * exact size) is not important, although the size of the fields need to

pngconf.h

 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.5.0rc01 - (PENDING RELEASE)
+ * libpng version 1.5.0rc02 - (PENDING RELEASE)
  *
  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngpriv.h

 
 /* pngpriv.h - private declarations for use inside libpng
  *
- * libpng version 1.5.0rc01 - (PENDING RELEASE)
+ * libpng version 1.5.0rc02 - (PENDING RELEASE)
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngtest.c

@@ -1784,4 +1784,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_0rc01 Your_png_h_is_not_version_1_5_0rc01;
+typedef png_libpng_version_1_5_0rc02 Your_png_h_is_not_version_1_5_0rc02;

projects/vstudio/readme.txt

 
 VisualStudio instructions
 
-libpng version 1.5.0rc01 - December 27, 2010
+libpng version 1.5.0rc02 - December 27, 2010
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 

projects/vstudio/zlib.props

@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.5.0rc01 - December 27, 2010
+ * libpng version 1.5.0rc02 - December 27, 2010
  *
  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
  *

scripts/README.txt

 
-Makefiles for  libpng version 1.5.0rc01 - December 27, 2010
+Makefiles for  libpng version 1.5.0rc02 - December 27, 2010
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng15.so.15.1.5.0rc01)
+                       (gcc, creates libpng15.so.15.1.5.0rc02)
  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 @@ pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       (gcc, creates libpng15.so.15.1.5.0rc01)
+                       (gcc, creates libpng15.so.15.1.5.0rc02)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.hpgcc    =>  HPUX makefile using gcc
@@ -35,12 +35,12 @@ pnglibconf.h.prebuilt       =>  Stores configuration settings
  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 libpng15.so.15.1.5.0rc01)
+                       creates libpng15.so.15.1.5.0rc02)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng15.so.15.1.5.0rc01)
+                       creates libpng15.so.15.1.5.0rc02)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng15.so.15.1.5.0rc01)
+                       creates libpng15.so.15.1.5.0rc02)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile

scripts/libpng-config-head.in

@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.5.0rc01
+version=1.5.0rc02
 prefix=""
 libdir=""
 libs=""

scripts/libpng.pc.in

@@ -5,6 +5,6 @@ includedir=@includedir@/libpng15
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.5.0rc01
+Version: 1.5.0rc02
 Libs: -L${libdir} -lpng15
 Cflags: -I${includedir}

scripts/makefile.ne12bsd

@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng15
 
 LIB=	png15
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.5.0rc01
+SHLIB_MINOR=	1.5.0rc02
 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

scripts/makefile.netbsd

@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.5.0rc01
+SHLIB_MINOR=	1.5.0rc02
 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

scripts/makefile.openbsd

@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.5.0rc01
+SHLIB_MINOR=	1.5.0rc02
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \

scripts/pngwin.def

@@ -17,7 +17,7 @@ LIBRARY
 ;OS2 CODE PRELOAD MOVEABLE DISCARDABLE
 
 EXPORTS
-;Version 1.5.0rc01
+;Version 1.5.0rc02
  png_access_version_number @1
  png_set_sig_bytes @2
  png_sig_cmp @3

scripts/pngwin.dfn

@@ -29,7 +29,7 @@ PNG_DEFN_MAGIC-;OS2 DESCRIPTION	"PNG image compression library"-PNG_DEFN_END
 PNG_DEFN_MAGIC-;OS2 CODE		PRELOAD MOVEABLE DISCARDABLE-PNG_DEFN_END
 PNG_DEFN_MAGIC--PNG_DEFN_END
 PNG_DEFN_MAGIC-EXPORTS-PNG_DEFN_END
-PNG_DEFN_MAGIC-;Version 1.5.0rc01-PNG_DEFN_END
+PNG_DEFN_MAGIC-;Version 1.5.0rc02-PNG_DEFN_END
 
 /* Read the defaults, but use scripts/pnglibconf.h.prebuilt; the 'standard'
  * header file.

scripts/symbols.def

@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.5.0rc01
+;Version 1.5.0rc02
  png_access_version_number @1
  png_set_sig_bytes @2
  png_sig_cmp @3