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;