diff --git a/History.md b/History.md
index 8a668175..994052b7 100644
--- a/History.md
+++ b/History.md
@@ -1,18 +1,19 @@
 2.9.0
 =======
+2023-11-27
 
-Missing closing tag in BankDetails when there's no BIC number #339
-ZUGFeRDExporterFromA3 did not set default ZUGFeRD Version
-Have a way to merge to PDF file without knowing if it is A-1 or A-3 #341
-Be able to validate XR 3.0 #347
+- Missing closing tag in BankDetails when there's no BIC number #339
+- ZUGFeRDExporterFromA3 did not set default ZUGFeRD Version
+- Have a way to merge to PDF file without knowing if it is A-1 or A-3 #341
+- Be able to validate XR 3.0 #347
 
 2.8.0
 =======
 2023-09-14
 
-Improvement of included notes #331
-fixes #259 by Heavenfighter
-introduction of --disable-file-logging command line option
+- Improvement of included notes #331
+- fixes #259 by Heavenfighter
+- introduction of --disable-file-logging command line option
 
 2.7.3
 =======
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromPDFA.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromPDFA.java
index a97a23e4..37ab4167 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromPDFA.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromPDFA.java
@@ -60,8 +60,12 @@ protected IZUGFeRDExporter getExporter() {
 		return theExporter;
 	}
 
-	private byte[] fileToByteArrayInputStream(String pdfFilename) throws IOException {
+	protected byte[] filenameToByteArray(String pdfFilename) throws IOException {
 		FileInputStream fileInputStream = new FileInputStream(pdfFilename);
+		return inputstreamToByteArray(fileInputStream);
+	}
+
+	protected byte[] inputstreamToByteArray(InputStream fileInputStream) throws IOException  {
 		byte[] bytes = new byte[fileInputStream.available()];
 		DataInputStream dataInputStream = new DataInputStream(fileInputStream);
 		dataInputStream.readFully(bytes);
@@ -105,7 +109,7 @@ private int getPDFAVersion(byte[] byteArrayInputStream) throws IOException {
 	 * @throws IOException
 	 */
 	public IZUGFeRDExporter load(String pdfFilename) throws IOException {
-		determineAndSetExporter(getPDFAVersion(fileToByteArrayInputStream(pdfFilename)));
+		determineAndSetExporter(getPDFAVersion(filenameToByteArray(pdfFilename)));
 		return theExporter.load(pdfFilename);
 	}
 
@@ -133,7 +137,7 @@ public IZUGFeRDExporter load(byte[] pdfBinary) throws IOException {
 	 * @throws IOException if anything is wrong with inputstream
 	 */
 	public IZUGFeRDExporter load(InputStream pdfSource) throws IOException {
-		determineAndSetExporter(getPDFAVersion(pdfSource.readAllBytes()));
+		determineAndSetExporter(getPDFAVersion(inputstreamToByteArray(pdfSource)));
 		return theExporter.load(pdfSource);
 	}