From 77df03a98bb93d6c9cab55533a270f3ce19a8708 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jochen=20Sta=CC=88rk?= <jstaerk@usegroup.de Jochen Staerk>
Date: Sat, 28 Oct 2017 17:12:01 +0200
Subject: [PATCH] Make sure custom XML provided by some anonymous developer is
 at least halfway valid ;-)

---
 .../java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java   | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java b/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java
index fe083bf4..44494ad6 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java
@@ -10,6 +10,11 @@ public class CustomXMLProvider implements IXMLProvider {
 	}
 
 	public void setXML(byte[] newData) {
+		String zf=new String(newData);
+		if (!zf.contains("<rsm:CrossIndustry")) {
+			throw new RuntimeException("ZUGFeRD XML does not contain <rsm:CrossIndustry and can thus not be valid");
+		}
+		
 		zugferdData=newData;
 	}