[master] Imported from libpng-1.4.2rc04.tarv1.4.2rc04

35 files changed, 220 insertions, 81 deletions

diff --git a/ANNOUNCE b/ANNOUNCE
index 162a6df5b..23a0bfe17 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -48,7 +48,7 @@ version 1.4.2rc04 [April 27, 2010]
   Added the "vstudio" project to replace "visualc6" and "visualc71" which
     will be removed from libpng-1.5.0.
   Demonstrate in example.c that lang_key should be initialized.
-  Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1143 in
+  Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
     contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
diff --git a/CHANGES b/CHANGES
index cf40a02d6..5af409606 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2559,7 +2559,7 @@ version 1.4.2rc04 [April 27, 2010]
   Added the "vstudio" project to replace "visualc6" and "visualc71" which
     will be removed from libpng-1.5.0.
   Demonstrate in example.c that lang_key should be initialized.
-  Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1143 in
+  Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
     contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1cef18857..847bbba3e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -213,7 +213,7 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 14.${PNGLIB_RELEASE}.1.4.2rc03
+#   VERSION 14.${PNGLIB_RELEASE}.1.4.2rc04
     VERSION 14.${PNGLIB_RELEASE}.0
     SOVERSION 14
     CLEAN_DIRECT_OUTPUT 1)
diff --git a/INSTALL b/INSTALL
index 1abd80610..3ce420a58 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.4.2rc03 - April 24, 2010
+Installing libpng version 1.4.2rc04 - April 27, 2010
 
 On Unix/Linux and similar systems, you can simply type
 
@@ -46,7 +46,7 @@ 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-1.4.2rc03" or "libpng14" and "zlib-1.2.3"
+might be called "libpng-1.4.2rc04" or "libpng14" and "zlib-1.2.3"
 or "zlib123") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
diff --git a/LICENSE b/LICENSE
index be7f1459f..afc3ecfa5 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.4.2rc03, April 24, 2010, are
+libpng versions 1.2.6, August 15, 2004, through 1.4.2rc04, April 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
@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-April 24, 2010
+April 27, 2010
diff --git a/Makefile.am b/Makefile.am
index d2009eb7c..6620e1dd1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -73,7 +73,7 @@ EXTRA_DIST= \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.4.2rc03.txt
+	example.c libpng-1.4.2rc04.txt
 
 CLEANFILES= pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers \
 libpng.sym
diff --git a/Makefile.in b/Makefile.in
index c5a0cdfba..f4151b5f9 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -333,7 +333,7 @@ EXTRA_DIST = \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.4.2rc03.txt
+	example.c libpng-1.4.2rc04.txt
 
 CLEANFILES = pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers \
 libpng.sym
diff --git a/README b/README
index 27ff03119..3f669442f 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.4.2rc03 - April 24, 2010 (shared library 14.0)
+README for libpng version 1.4.2rc04 - April 27, 2010 (shared library 14.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
@@ -185,9 +185,9 @@ Files in this distribution:
        makefile.std     =>  Generic UNIX makefile (cc, creates static
                             libpng.a)
        makefile.elf     =>  Linux/ELF makefile symbol versioning,
-                            gcc, creates libpng14.so.14.1.4.2rc03)
+                            gcc, creates libpng14.so.14.1.4.2rc04)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng14.so.14.1.4.2rc03)
+                            (gcc, creates libpng14.so.14.1.4.2rc04)
        makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
        makefile.knr     =>  Archaic UNIX Makefile that converts files with
                             ansi2knr (Requires ansi2knr.c from
@@ -209,12 +209,12 @@ Files in this distribution:
        makefile.openbsd =>  OpenBSD makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
        makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng14.so.14.1.4.2rc03)
+                            (gcc, creates libpng14.so.14.1.4.2rc04)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng14.so.14.1.4.2rc03)
+                            (gcc, creates libpng14.so.14.1.4.2rc04)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng14.so.14.1.4.2rc03)
+                            (gcc, creates libpng14.so.14.1.4.2rc04)
        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
diff --git a/configure b/configure
index 2245d4894..7a25325ba 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.65 for libpng 1.4.2rc03.
+# Generated by GNU Autoconf 2.65 for libpng 1.4.2rc04.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -701,8 +701,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.4.2rc03'
-PACKAGE_STRING='libpng 1.4.2rc03'
+PACKAGE_VERSION='1.4.2rc04'
+PACKAGE_STRING='libpng 1.4.2rc04'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1432,7 +1432,7 @@ 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 1.4.2rc03 to adapt to many kinds of systems.
+\`configure' configures libpng 1.4.2rc04 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1502,7 +1502,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.4.2rc03:";;
+     short | recursive ) echo "Configuration of libpng 1.4.2rc04:";;
    esac
   cat <<\_ACEOF
 
@@ -1607,7 +1607,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.4.2rc03
+libpng configure 1.4.2rc04
 generated by GNU Autoconf 2.65
 
 Copyright (C) 2009 Free Software Foundation, Inc.
@@ -2032,7 +2032,7 @@ 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 1.4.2rc03, which was
+It was created by libpng $as_me 1.4.2rc04, which was
 generated by GNU Autoconf 2.65.  Invocation command line was
 
   $ $0 $@
@@ -2840,7 +2840,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.4.2rc03'
+ VERSION='1.4.2rc04'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2904,7 +2904,7 @@ fi
 
 
 
-PNGLIB_VERSION=1.4.2rc03
+PNGLIB_VERSION=1.4.2rc04
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=4
 PNGLIB_RELEASE=2
@@ -12032,7 +12032,7 @@ 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 1.4.2rc03, which was
+This file was extended by libpng $as_me 1.4.2rc04, which was
 generated by GNU Autoconf 2.65.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -12098,7 +12098,7 @@ _ACEOF
 cat >>$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 1.4.2rc03
+libpng config.status 1.4.2rc04
 configured by $0, generated by GNU Autoconf 2.65,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 9b17e80ac..79c21ccf1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,12 +18,12 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.4.2rc03], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.4.2rc04], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.4.2rc03
+PNGLIB_VERSION=1.4.2rc04
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=4
 PNGLIB_RELEASE=2
diff --git a/example.c b/example.c
index da67ff684..25069c5db 100644
--- a/example.c
+++ b/example.c
@@ -2,7 +2,7 @@
 #if 0 /* in case someone actually tries to compile this */
 
 /* example.c - an example of using libpng
- * Last changed in libpng 1.4.2 [April 24, 2010]
+ * Last changed in libpng 1.4.2 [April 27, 2010]
  * This file has been placed in the public domain by the authors.
  * Maintained 1998-2010 Glenn Randers-Pehrson
  * Maintained 1996, 1997 Andreas Dilger)
@@ -687,8 +687,11 @@ void write_png(char *file_name /* , ... other image information ... */)
    text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
 #ifdef PNG_iTXt_SUPPORTED
    text_ptr[0].lang = NULL;
+   text_ptr[0].lang_key = NULL;
    text_ptr[1].lang = NULL;
+   text_ptr[1].lang_key = NULL;
    text_ptr[2].lang = NULL;
+   text_ptr[2].lang_key = NULL;
 #endif
    png_set_text(png_ptr, info_ptr, text_ptr, 3);
 
diff --git a/libpng-1.4.2rc03.txt b/libpng-1.4.2rc04.txt
index b9dda0d83..796aa07ad 100644
--- a/libpng-1.4.2rc03.txt
+++ b/libpng-1.4.2rc04.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.4.2rc03 - April 24, 2010
+ libpng version 1.4.2rc04 - April 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.4.2rc03 - April 24, 2010
+ libpng versions 0.97, January 1998, through 1.4.2rc04 - April 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
@@ -903,7 +903,7 @@ 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 1.4.2rc03, not all possible expansions are supported.
+As of libpng version 1.4.2rc04, 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
@@ -3297,13 +3297,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 XIII. Y2K Compliance in libpng
 
-April 24, 2010
+April 27, 2010
 
 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 1.4.2rc03 are Y2K compliant.  It is my belief that earlier
+upward through 1.4.2rc04 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 97911fe38..c946d2ab6 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "April 24, 2010"
+.TH LIBPNG 3 "April 27, 2010"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.4.2rc03
+libpng \- Portable Network Graphics (PNG) Reference Library 1.4.2rc04
 .SH SYNOPSIS
 \fI\fB
 
@@ -785,7 +785,7 @@ 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 1.4.2rc03 - April 24, 2010
+ libpng version 1.4.2rc04 - April 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
@@ -796,7 +796,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.4.2rc03 - April 24, 2010
+ libpng versions 0.97, January 1998, through 1.4.2rc04 - April 27, 2010
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
@@ -1688,7 +1688,7 @@ 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 1.4.2rc03, not all possible expansions are supported.
+As of libpng version 1.4.2rc04, 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
@@ -4082,13 +4082,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XIII. Y2K Compliance in libpng
 
-April 24, 2010
+April 27, 2010
 
 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 1.4.2rc03 are Y2K compliant.  It is my belief that earlier
+upward through 1.4.2rc04 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
@@ -4322,7 +4322,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.4.2rc03 - April 24, 2010:
+Libpng version 1.4.2rc04 - April 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).
 
@@ -4345,7 +4345,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.4.2rc03, April 24, 2010, are
+libpng versions 1.2.6, August 15, 2004, through 1.4.2rc04, April 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
@@ -4444,7 +4444,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-April 24, 2010
+April 27, 2010
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index 4a129147d..f250765d9 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "April 24, 2010"
+.TH LIBPNGPF 3 "April 27, 2010"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.4.2rc03
+libpng \- Portable Network Graphics (PNG) Reference Library 1.4.2rc04
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index 3d732fb5a..b6e09ea41 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "April 24, 2010"
+.TH PNG 5 "April 27, 2010"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index d89d5e021..d868a1cf0 100644
--- a/png.c
+++ b/png.c
@@ -17,7 +17,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_4_2rc03 Your_png_h_is_not_version_1_4_2rc03;
+typedef version_1_4_2rc04 Your_png_h_is_not_version_1_4_2rc04;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.
@@ -551,13 +551,13 @@ png_get_copyright(png_structp png_ptr)
 #else
 #ifdef __STDC__
    return ((png_charp) PNG_STRING_NEWLINE \
-     "libpng version 1.4.2rc03 - April 24, 2010" PNG_STRING_NEWLINE \
+     "libpng version 1.4.2rc04 - April 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 ((png_charp) "libpng version 1.4.2rc03 - April 24, 2010\
+      return ((png_charp) "libpng version 1.4.2rc04 - April 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.");
diff --git a/png.h b/png.h
index e5f1a7268..54f1c475f 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.4.2rc03 - April 24, 2010
+ * libpng version 1.4.2rc04 - April 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 1.4.2rc03 - April 24, 2010: Glenn
+ *  libpng versions 0.97, January 1998, through 1.4.2rc04 - April 27, 2010: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -171,7 +171,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.4.2rc03, April 24, 2010, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.4.2rc04, April 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:
@@ -283,13 +283,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    April 24, 2010
+ *    April 27, 2010
  *
  *    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 1.4.2rc03 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.4.2rc04 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
@@ -345,9 +345,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.4.2rc03"
+#define PNG_LIBPNG_VER_STRING "1.4.2rc04"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.4.2rc03 - April 24, 2010\n"
+   " libpng version 1.4.2rc04 - April 27, 2010\n"
 
 #define PNG_LIBPNG_VER_SONUM   14
 #define PNG_LIBPNG_VER_DLLNUM  14
@@ -360,7 +360,7 @@
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  03
+#define PNG_LIBPNG_VER_BUILD  04
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -1469,7 +1469,7 @@ struct png_struct_def
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_4_2rc03;
+typedef png_structp version_1_4_2rc04;
 
 typedef png_struct FAR * FAR * png_structpp;
 
diff --git a/pngconf.h b/pngconf.h
index 740b768a0..c56b4a4a0 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.4.2rc03 - April 24, 2010
+ * libpng version 1.4.2rc04 - April 27, 2010
  * 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)
diff --git a/pngpriv.h b/pngpriv.h
index ed3af7784..a8a52aebb 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1,7 +1,7 @@
 
 /* pngpriv.h - private declarations for use inside libpng
  *
- * libpng version 1.4.2rc03 - April 24, 2010
+ * libpng version 1.4.2rc04 - April 27, 2010
  * 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)
diff --git a/pngread.c b/pngread.c
index 5473b2eea..42974c897 100644
--- a/pngread.c
+++ b/pngread.c
@@ -1,7 +1,7 @@
 
 /* pngread.c - read a PNG file
  *
- * Last changed in libpng 1.4.2 [April 24, 2010]
+ * Last changed in libpng 1.4.2 [April 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.)
diff --git a/pngrtran.c b/pngrtran.c
index 1538a81ab..48e1664e0 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.4.2 [April 24, 2010]
+ * Last changed in libpng 1.4.2 [April 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.)
diff --git a/pngrutil.c b/pngrutil.c
index 26b834e95..2fc0dd285 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.4.2 [April 24, 2010]
+ * Last changed in libpng 1.4.2 [April 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.)
diff --git a/pngtest.c b/pngtest.c
index 03817c301..17afb15ae 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1627,4 +1627,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_4_2rc03 your_png_h_is_not_version_1_4_2rc03;
+typedef version_1_4_2rc04 your_png_h_is_not_version_1_4_2rc04;
diff --git a/projects/visualc6/readme.txt b/projects/visualc6/readme.txt
new file mode 100644
index 000000000..4187b70b5
--- /dev/null
+++ b/projects/visualc6/readme.txt
@@ -0,0 +1,93 @@
+
+VisualStudio instructions
+
+libpng version 1.4.2rc04 - April 27, 2010
+
+Copyright (c) 1998-2010 Glenn Randers-Pehrson
+
+This code is released under the libpng license.
+For conditions of distribution and use, see the disclaimer
+and license in png.h
+
+This directory  contains support for building libpng under MicroSoft
+VisualStudio 2010.  It may also work under later versions of VisualStudio.
+You should be familiar with VisualStudio before using this directory.
+
+This is a slightly modified copy of the 'vstudio' solution from libpng
+1.5; it is intended to provide compatibility for libpng 1.4 with later
+releases of zlib (from 1.2.4) and to provide a migration aid for 1.5.
+
+A 'VB' DLL is no longer produced - use the standard 'Release' DLL.
+
+Initial preparations
+====================
+You should install the 'official' build of zlib on your system - follow the
+instructions provided on http://www.zlib.net.  When a new release is being
+made of zlib the instructions disappear for a while until the new official
+build is available.  You will have to wait.
+
+You must enter some information in zlib.props before attempting to build
+with this 'solution'.  Please read and edit zlib.props first.  You will
+probably not be familiar with the contents of zlib.props - do not worry,
+it is mostly harmless.
+
+Make sure that your official build layout matches the requirements listed
+in zlib.props.  Prior to zlib-1.2.4 the official build (1.2.3) placed
+include and library files in different directories - if you find this
+has happened just put them all in the same directory.
+
+This is all you need to do to build the 'release' and 'release library'
+configurations.
+
+Debugging
+=========
+The release configurations default to /Ox optimization.  Full debugging
+information is produced (in the .pdb), but if you encounter a problem the
+optimization may make it difficult to debug.  Simply rebuild with a lower
+optimization level (e.g. /Od.)
+
+Stop reading here
+=================
+You have enough information to build a working application.
+
+Debug versions have limited support
+===================================
+This solution includes limited support for debug versions of libpng.  You
+do not need these unless your own solution itself uses debug builds (it is
+far more effective to debug on the release builds, there is no point building
+a special debug build.)
+
+If, despite the previous paragraph, you still feel you need a debug build you
+will have to download the zlib source as well (http://www.zlib.net) and include
+the directory where you unpack it in zlib.props.  This solution will then be
+able to build a minimal zlib sufficient for libpng.  This build is only
+suitable for making a debug libpng.
+
+The debug build of libpng is minimally supported.  Support for debug builds of
+zlib is also minimal.  You really don't want to do this.
+
+This solution only supports the Multi-Threaded DLL C Runtime
+============================================================
+If you examine the solution you will find that it very deliberately lists
+exactly which MicroSoft DLLs it is linking against.  It explicitly links
+against msvcrt.lib.  The debug version links against msvcrtd.lib (this is
+why it is a debug version - it's nothing to do with having any special
+debug support, it doesn't).
+
+These versions of the MicroSoft C runtime correspond to the compiler flags
+/MD (release) and /MDd (debug) - the "Multi-Threaded DLL" implementation of the
+C runtime library.
+
+If you need to change this then you will have to make sure that both the
+compiler flags and the ".lib" in the linker dependences match up.  Fortunately
+neither zlib nor libpng require libraries other than a C runtime and
+kernel32.
+
+You cannot pass (FILE*) objects from a different runtime (including msvcrtd
+to msvcrt) to libpng.  If you do then your program will crash within libpng
+when it first makes a file read or write call.
+
+It is likely if you have read this far that you have found you can't avoid
+having multiple C runtimes in your program.  This is OK, it does work, but
+you will have to implement the libpng file read/write callbacks rather than
+using the internal libpng default.  This is easy.
diff --git a/projects/visualc6/zlib.props b/projects/visualc6/zlib.props
new file mode 100644
index 000000000..b29df0ca4
--- /dev/null
+++ b/projects/visualc6/zlib.props
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ * zlib.props - location of zlib source and build
+ *
+ * libpng version 1.4.2rc04 - April 27, 2010
+ *
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+
+ * You must edit this file to record the location of the zlib
+ * official and debug builds unless they are in the default
+ * directories:
+
+ *   official: zlib1
+ *   debug:    zlib debug
+ -->
+
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Label="Globals">
+    <!-- Place the name of the directory containing the official
+         build of zlib and the corresponding header files in this
+         property.  The directory is expected to contain at least:
+
+            zdll.lib  # The DLL import library
+            zlib.lib  # The static library
+            zlib.h    # The header file
+            zconf.h   # Another header file included by zlib.h
+     -->
+    <ZLib1Dir>..\..\..\..\zlib124-dll\zlib-1.2.4</ZLib1Dir>
+
+    <!-- Place the name of the directory containing the source of
+         zlib used for debugging in this property.
+         The directory need only contain the '.c' and '.h' files
+         from the source.  For your own sanity make sure that the
+         '.h' files in the source match those from the 'official'
+         build above.
+     -->
+    <ZLibSrcDir>..\..\..\..\zlib-1.2.4</ZLibSrcDir>
+  </PropertyGroup>
+</Project>
diff --git a/projects/xcode/libpng.xcodeproj/project.pbxproj b/projects/xcode/libpng.xcodeproj/project.pbxproj
index 1de8f821e..018383544 100644
--- a/projects/xcode/libpng.xcodeproj/project.pbxproj
+++ b/projects/xcode/libpng.xcodeproj/project.pbxproj
@@ -226,7 +226,7 @@
 				COPY_PHASE_STRIP = NO;
 				DYLIB_COMPATIBILITY_VERSION = 14;
 				DYLIB_CURRENT_VERSION = 14;
-				FRAMEWORK_VERSION = 1.4.2rc03;
+				FRAMEWORK_VERSION = 1.4.2rc04;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
@@ -244,7 +244,7 @@
 			buildSettings = {
 				DYLIB_COMPATIBILITY_VERSION = 14;
 				DYLIB_CURRENT_VERSION = 14;
-				FRAMEWORK_VERSION = 1.4.2rc03;
+				FRAMEWORK_VERSION = 1.4.2rc04;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
diff --git a/scripts/README.txt b/scripts/README.txt
index e48210a51..9a5ff1d78 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,8 +1,8 @@
 
-Makefiles for  libpng version 1.4.2rc03 - April 24, 2010
+Makefiles for  libpng version 1.4.2rc04 - April 27, 2010
 
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng14.so.14.1.4.2rc03)
+                       (gcc, creates libpng14.so.14.1.4.2rc04)
  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 @@ Makefiles for  libpng version 1.4.2rc03 - April 24, 2010
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng14.so.14.1.4.2rc03)
+                       gcc, creates libpng14.so.14.1.4.2rc04)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.hpgcc    =>  HPUX makefile using gcc
@@ -36,12 +36,12 @@ Makefiles for  libpng version 1.4.2rc03 - April 24, 2010
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng14.so.14.1.4.2rc03)
+                       creates libpng14.so.14.1.4.2rc04)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng14.so.14.1.4.2rc03)
+                       creates libpng14.so.14.1.4.2rc04)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng14.so.14.1.4.2rc03)
+                       creates libpng14.so.14.1.4.2rc04)
  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 6c6ddc6a9..c95c4e612 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.4.2rc03
+version=1.4.2rc04
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 2cb5756bb..88026c22c 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng14
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.4.2rc03
+Version: 1.4.2rc04
 Libs: -L${libdir} -lpng14
 Cflags: -I${includedir}
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 7d8cbe433..c73e94e82 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng14
 
 LIB=	png14
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.4.2rc03
+SHLIB_MINOR=	1.4.2rc04
 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 b2e9b5fcb..d2f1a5486 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.4.2rc03
+SHLIB_MINOR=	1.4.2rc04
 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 00ddd9455..0594ac308 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.4.2rc03
+SHLIB_MINOR=	1.4.2rc04
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/png32ce.def b/scripts/png32ce.def
index f1d170c2d..19b1ef190 100644
--- a/scripts/png32ce.def
+++ b/scripts/png32ce.def
@@ -15,7 +15,7 @@ LIBRARY lpngce
  png_get_int_32
 
 EXPORTS
-;Version 1.4.2rc03
+;Version 1.4.2rc04
   png_build_grayscale_palette  @1
 ;  png_check_sig        @2
   png_chunk_error      @3
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index 990e32141..03a0585a9 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.4.2rc03
+; Version 1.4.2rc04
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngwin.def b/scripts/pngwin.def
index c93025dc2..c722a2c1d 100644
--- a/scripts/pngwin.def
+++ b/scripts/pngwin.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.4.2rc03
+;Version 1.4.2rc04
   png_build_grayscale_palette
   png_chunk_error
   png_chunk_warning