Commit the patch

0001-cfImageOpenFP-Removed-leftover-HAVE_LIBZ-conditional.patch

@@ -0,0 +1,61 @@
+From 6b87c6e8f4c87652a73841fbc4259ff63c25b0f6 Mon Sep 17 00:00:00 2001
+From: Till Kamppeter <till.kamppeter@gmail.com>
+Date: Sun, 5 Feb 2023 13:59:14 +0100
+Subject: [PATCH] cfImageOpenFP(): Removed leftover HAVE_LIBZ conditionals
+
+In an earlier commit we have removed the dependency on libz from the
+build system as there is no explicit dependency on it in
+libcupsfilters.
+
+The conditionals for libpng availability (HAVE_LIBPNG) were combined
+with HAVE_LIBZ, probably due to internal use of libz by libpng. This
+is unnecessary and broke PNG image reading support since HAVE_LIBZ
+does not get defined any more by the build system.
+
+So we have simply removed the HAVE_LIBZ conditionals now.
+---
+ cupsfilters/image-png.c | 4 ++--
+ cupsfilters/image.c     | 4 ++--
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/cupsfilters/image-png.c b/cupsfilters/image-png.c
+index 60bd6a86..9690cdf5 100644
+--- a/cupsfilters/image-png.c
++++ b/cupsfilters/image-png.c
+@@ -18,7 +18,7 @@
+ 
+ #include "image-private.h"
+ 
+-#if defined(HAVE_LIBPNG) && defined(HAVE_LIBZ)
++#ifdef HAVE_LIBPNG
+ #  include <png.h>	// Portable Network Graphics (PNG) definitions
+ 
+ 
+@@ -315,4 +315,4 @@ _cfImageReadPNG(
+ 
+   return (0);
+ }
+-#endif // HAVE_LIBPNG && HAVE_LIBZ
++#endif // HAVE_LIBPNG
+diff --git a/cupsfilters/image.c b/cupsfilters/image.c
+index 76d1d8ca..cfd2095f 100644
+--- a/cupsfilters/image.c
++++ b/cupsfilters/image.c
+@@ -382,12 +382,12 @@ cfImageOpenFP(
+   img->xppi      = 200;
+   img->yppi      = 200;
+ 
+-#if defined(HAVE_LIBPNG) && defined(HAVE_LIBZ)
++#ifdef HAVE_LIBPNG
+   if (!memcmp(header, "\211PNG", 4))
+     status = _cfImageReadPNG(img, fp, primary, secondary, saturation, hue,
+ 			     lut);
+   else
+-#endif // HAVE_LIBPNG && HAVE_LIBZ
++#endif // HAVE_LIBPNG
+ #ifdef HAVE_LIBJPEG
+   if (!memcmp(header, "\377\330\377", 3) &&	// Start-of-Image
+       header[3] >= 0xe0 && header[3] <= 0xef)	// APPn
+-- 
+2.39.1
+