From 77d9437e2812baad3e09ac344dd419d2ffada675 Mon Sep 17 00:00:00 2001
From: "Michael R. Crusoe" <crusoe@debian.org>
Date: Mon, 29 Apr 2024 16:02:11 +0200
Subject: [PATCH] Cherry-pick patch from upstream to fix issue with newer expat
 and appended data.

Closes: #1064762
---
 debian/changelog                    |  7 +++-
 debian/patches/09_newer_expat.patch | 64 +++++++++++++++++++++++++++++
 debian/patches/series               |  1 +
 3 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 debian/patches/09_newer_expat.patch

diff --git a/debian/changelog b/debian/changelog
index 3925313e4..031ec3f08 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,9 +1,14 @@
-vtk9 (9.1.0+really9.1.0+dfsg2-8) unreleased; urgency=medium
+vtk9 (9.1.0+really9.1.0+dfsg2-8) UNRELEASED; urgency=medium
 
+  [ Bo YU ]
   * Team upload.
   * Add support for loongarch64. Thanks to Dandan Zhang
     <zhangdandan@loongson.cn>. (Closes: #1054471)
 
+  [ Michael R. Crusoe ]
+  * Cherry-pick patch from upstream to fix issue with newer expat and
+    appended data. Closes: #1064762
+
  -- Bo YU <tsu.yubo@gmail.com>  Tue, 24 Oct 2023 14:35:29 +0800
 
 vtk9 (9.1.0+really9.1.0+dfsg2-7.1) unstable; urgency=medium
diff --git a/debian/patches/09_newer_expat.patch b/debian/patches/09_newer_expat.patch
new file mode 100644
index 000000000..1894d75ba
--- /dev/null
+++ b/debian/patches/09_newer_expat.patch
@@ -0,0 +1,64 @@
+From: Ben Boeckel <ben.boeckel@kitware.com>
+Date: Mon, 15 Apr 2024 22:22:22 -0400
+Subject: vtkXMLDataParser: track `AppendedData` state explicitly
+Bug-Debian: https://bugs.debian.org/1064762
+Origin: upstream,https://gitlab.kitware.com/vtk/vtk/-/commit/3efa07ad277efe5c1d11a2ef2b907c095f68bbef
+Forwarded: not-needed
+
+Newer `libexpat` doesn't like being given the appended data after the
+artificially ended document anymore. Avoid pushing it through to its
+parser.
+
+---
+ IO/XMLParser/vtkXMLDataParser.cxx | 6 +++++-
+ IO/XMLParser/vtkXMLDataParser.h   | 3 +++
+ 2 files changed, 8 insertions(+), 1 deletion(-)
+
+--- vtk9.orig/IO/XMLParser/vtkXMLDataParser.cxx
++++ vtk9/IO/XMLParser/vtkXMLDataParser.cxx
+@@ -47,6 +47,7 @@
+   this->RootElement = nullptr;
+   this->AppendedDataPosition = 0;
+   this->AppendedDataMatched = 0;
++  this->AppendedDataFound = false;
+   this->DataStream = nullptr;
+   this->InlineDataStream = vtkBase64InputStream::New();
+   this->AppendedDataStream = vtkBase64InputStream::New();
+@@ -99,6 +100,7 @@
+ {
+   this->Superclass::PrintSelf(os, indent);
+   os << indent << "AppendedDataPosition: " << this->AppendedDataPosition << "\n";
++  os << indent << "AppendedDataFound: " << this->AppendedDataFound << "\n";
+   if (this->RootElement)
+   {
+     this->RootElement->PrintXML(os, indent);
+@@ -227,7 +229,7 @@
+   // If we have reached the appended data section, we stop parsing.
+   // This prevents the XML parser from having to walk over the entire
+   // appended data section.
+-  if (this->AppendedDataPosition)
++  if (this->AppendedDataPosition || this->AppendedDataFound)
+   {
+     return 1;
+   }
+@@ -448,6 +450,8 @@
+     {
+       return 0;
+     }
++
++    this->AppendedDataFound = true;
+   }
+ 
+   return 1;
+--- vtk9.orig/IO/XMLParser/vtkXMLDataParser.h
++++ vtk9/IO/XMLParser/vtkXMLDataParser.h
+@@ -215,6 +215,9 @@
+   // How much of the string "<AppendedData" has been matched in input.
+   int AppendedDataMatched;
+ 
++  // Whether AppendedData has been dealt with or not.
++  bool AppendedDataFound;
++
+   // The byte order of the binary input.
+   int ByteOrder;
+ 
diff --git a/debian/patches/series b/debian/patches/series
index 0797cf1a4..38351cd2a 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1,3 +1,4 @@
+09_newer_expat.patch
 gcc-13.patch
 10_matplotlib.patch
 20_do_not_link_against_socket.patch
-- 
2.30.2