Revert "Update libpng to 1.6.47"

This reverts commit bab9c3c.

The upgrade is problematic, it will be reviewed and re-attempted later. For now, we want a working next build.

Author: Dutchman101

vendor/libpng/ANNOUNCE

@@ -1,4 +1,4 @@
-libpng 1.6.47 - February 18, 2025
+libpng 1.6.43 - February 23, 2024
 =================================
 
 This is a public release of libpng, intended for use in production code.
@@ -9,13 +9,13 @@ Files available for download
 
 Source files with LF line endings (for Unix/Linux):
 
- * libpng-1.6.47.tar.xz (LZMA-compressed, recommended)
- * libpng-1.6.47.tar.gz (deflate-compressed)
+ * libpng-1.6.43.tar.xz (LZMA-compressed, recommended)
+ * libpng-1.6.43.tar.gz (deflate-compressed)
 
 Source files with CRLF line endings (for Windows):
 
- * lpng1647.7z (LZMA-compressed, recommended)
- * lpng1647.zip (deflate-compressed)
+ * lpng1643.7z (LZMA-compressed, recommended)
+ * lpng1643.zip (deflate-compressed)
 
 Other information:
 
@@ -25,19 +25,36 @@ Other information:
  * TRADEMARK.md
 
 
-Changes from version 1.6.46 to version 1.6.47
+Changes from version 1.6.42 to version 1.6.43
 ---------------------------------------------
 
- * Modified the behaviour of colorspace chunks in order to adhere
-   to the new precedence rules formulated in the latest draft of
-   the PNG Specification.
+ * Fixed the row width check in png_check_IHDR().
+   This corrected a bug that was specific to the 16-bit platforms,
+   and removed a spurious compiler warning from the 64-bit builds.
+   (Reported by Jacek Caban; fixed by John Bowler)
+ * Added eXIf chunk support to the push-mode reader in pngpread.c.
+   (Contributed by Chris Blume)
+ * Added contrib/pngexif for the benefit of the users who would like
+   to inspect the content of eXIf chunks.
+ * Added contrib/conftest/basic.dfa, a basic build-time configuration.
    (Contributed by John Bowler)
- * Fixed a latent bug in `png_write_iCCP`.
-   This would have been a read-beyond-end-of-malloc vulnerability,
-   introduced early in the libpng-1.6.0 development, yet (fortunately!)
-   it was inaccessible before the above-mentioned modification of the
-   colorspace precedence rules, due to pre-existing colorspace checks.
-   (Reported by Bob Friesenhahn; fixed by John Bowler)
+ * Fixed a preprocessor condition in pngread.c that broke build-time
+   configurations like contrib/conftest/pngcp.dfa.
+   (Contributed by John Bowler)
+ * Added CMake build support for LoongArch LSX.
+   (Contributed by GuXiWei)
+ * Fixed a CMake build error that occurred under a peculiar state of the
+   dependency tree. This was a regression introduced in libpng-1.6.41.
+   (Contributed by Dan Rosser)
+ * Marked the installed libpng headers as system headers in CMake.
+   (Contributed by Benjamin Buch)
+ * Updated the build support for RISCOS.
+   (Contributed by Cameron Cawley)
+ * Updated the makefiles to allow cross-platform builds to initialize
+   conventional make variables like AR and ARFLAGS.
+ * Added various improvements to the CI scripts in areas like version
+   consistency verification and text linting.
+ * Added version consistency verification to pngtest.c also.
 
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net.

vendor/libpng/AUTHORS

@@ -17,7 +17,6 @@ Authors, for copyright and licensing purposes.
  * James Yu
  * John Bowler
  * Kevin Bracey
- * Lucas Chollet
  * Magnus Holmgren
  * Mandar Sahastrabuddhe
  * Mans Rullgard

vendor/libpng/CHANGES

@@ -6196,61 +6196,6 @@ Version 1.6.43 [February 23, 2024]
     consistency verification and text linting.
   Added version consistency verification to pngtest.c also.
 
-Version 1.6.44 [September 12, 2024]
-  Hardened calculations in chroma handling to prevent overflows, and
-    relaxed a constraint in cHRM validation to accomodate the standard
-    ACES AP1 set of color primaries.
-    (Contributed by John Bowler)
-  Removed the ASM implementation of ARM Neon optimizations and updated
-    the build accordingly. Only the remaining C implementation shall be
-    used from now on, thus ensuring the support of the PAC/BTI security
-    features on ARM64.
-    (Contributed by Ross Burton and John Bowler)
-  Fixed the pickup of the PNG_HARDWARE_OPTIMIZATIONS option in the
-    CMake build on FreeBSD/amd64. This is an important performance fix
-    on this platform.
-  Applied various fixes and improvements to the CMake build.
-    (Contributed by Eric Riff, Benjamin Buch and Erik Scholz)
-  Added fuzzing targets for the simplified read API.
-    (Contributed by Mikhail Khachayants)
-  Fixed a build error involving pngtest.c under a custom config.
-    This was a regression introduced in a code cleanup in libpng-1.6.43.
-    (Contributed by Ben Wagner)
-  Fixed and improved the config files for AppVeyor CI and Travis CI.
-
-Version 1.6.45 [January 7, 2025]
-  Added support for the cICP chunk.
-    (Contributed by Lucas Chollet and John Bowler)
-  Adjusted and improved various checks in colorspace calculations.
-    (Contributed by John Bowler)
-  Rearranged the write order of colorspace chunks for better conformance
-    with the PNG v3 draft specification.
-    (Contributed by John Bowler)
-  Raised the minimum required CMake version from 3.6 to 3.14.
-  Forked off a development branch for libpng version 1.8.
-
-Version 1.6.46 [January 23, 2025]
-  Added support for the mDCV and cLLI chunks.
-    (Contributed by John Bowler)
-  Fixed a build issue affecting C89 compilers.
-    This was a regression introduced in libpng-1.6.45.
-    (Contributed by John Bowler)
-  Added makefile.c89, specifically for testing C89 compilers.
-  Cleaned up contrib/pngminus: corrected an old typo, removed an old
-    workaround, and updated the CMake file.
-
-Version 1.6.47 [February 18, 2025]
-  Modified the behaviour of colorspace chunks in order to adhere
-    to the new precedence rules formulated in the latest draft of
-    the PNG Specification.
-    (Contributed by John Bowler)
-  Fixed a latent bug in `png_write_iCCP`.
-    This would have been a read-beyond-end-of-malloc vulnerability,
-    introduced early in the libpng-1.6.0 development, yet (fortunately!)
-    it was inaccessible before the above-mentioned modification of the
-    colorspace precedence rules, due to pre-existing colorspace checks.
-    (Reported by Bob Friesenhahn; fixed by John Bowler)
-
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net.
 Subscription is required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement

vendor/libpng/LICENSE

@@ -4,8 +4,8 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
 PNG Reference Library License version 2
 ---------------------------------------
 
- * Copyright (c) 1995-2025 The PNG Reference Library Authors.
- * Copyright (c) 2018-2025 Cosmin Truta.
+ * Copyright (c) 1995-2024 The PNG Reference Library Authors.
+ * Copyright (c) 2018-2024 Cosmin Truta.
  * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
  * Copyright (c) 1996-1997 Andreas Dilger.
  * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.

vendor/libpng/README

@@ -1,4 +1,4 @@
-README for libpng version 1.6.47
+README for libpng version 1.6.43
 ================================
 
 See the note about version numbers near the top of `png.h`.
@@ -157,6 +157,8 @@ Files included in this distribution
                           "PNG: The Definitive Guide" by Greg Roelofs,
                           O'Reilly, 1999
         libtests/     =>  Test programs
+        oss-fuzz/     =>  Files used by the OSS-Fuzz project for fuzz-testing
+                          libpng
         pngexif/      =>  Program to inspect the EXIF information in PNG files
         pngminim/     =>  Minimal decoder, encoder, and progressive decoder
                           programs demonstrating the use of pngusr.dfa

vendor/libpng/example.c

@@ -1,3 +1,4 @@
+
 #if 0 /* in case someone actually tries to compile this */
 
 /* example.c - an example of using libpng