From f9611e6538eabda3cbad271568dd756262ed58b9 Mon Sep 17 00:00:00 2001
From: CGantert345 <57003061+CGantert345@users.noreply.github.com>
Date: Fri, 10 Feb 2023 14:37:39 +0100
Subject: Exceptions in case of wrong U_HAED content

---
 .../uic/barcode/staticFrame/UHEADDataRecord.java   | 32 ++++++++++++++++++++--
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java b/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java
index 22ba8ce..31a664b 100644
--- a/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java
+++ b/src/main/java/org/uic/barcode/staticFrame/UHEADDataRecord.java
@@ -222,8 +222,26 @@ public class UHEADDataRecord extends DataRecord{
 		protected void encodeContent() throws IOException, EncodingFormatException {
 			
 	        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-	    	
+	        
+	        if (this.issuer == null || this.issuer.length() < 1) {
+	        	throw new EncodingFormatException("Issuer in U_HEAD missing");
+	        }
+	        if (this.issuer.length() > 4) {
+	        	throw new EncodingFormatException("Issuer in U_HEAD too long (max 4 bytes)");
+	        }
+	        
+	        
   	     	String issuerElement = String.format("%4s", this.issuer);
+  	     	
+  	     	if (this.identifier == null || this.identifier.length() < 1) {
+  	     		throw new EncodingFormatException("Identifier in U_HEAD missing");
+  	     	}  
+  	     	
+  	     	if (this.identifier.length() > 20) {
+  	     		throw new EncodingFormatException("Identifier in U_HEAD too long (max. 20 bytes)");
+  	     	}
+	     	
+  	     	
 
 			String idElement = String.format("%20s", this.identifier);
 			
@@ -248,12 +266,20 @@ public class UHEADDataRecord extends DataRecord{
 			String language1 = null;
 			String language2 = null;
 			if (this.language != null) {
-				language1 = String.format("%2s" ,this.language);
+				if (this.language.length() > 2) {
+					language1 = String.format("%2s" ,this.language.substring(0, 2));
+				} else {
+					language1 = String.format("%2s" ,this.language);
+				}
 			} else {
 				language1 = "  ";
 			}
 			if (this.additionalLanguage != null) {
-				language2 = String.format("%2s" ,this.additionalLanguage);
+				if (this.additionalLanguage.length() > 2) {
+					language2 = String.format("%2s" ,this.additionalLanguage.substring(0, 2));	
+				} else {
+					language2 = String.format("%2s" ,this.additionalLanguage);	
+				}
 			} else {
 				language2 = "  ";
 			}
-- 
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