Configurable PDF Attachment Compression

library/src/main/java/org/mustangproject/ZUGFeRD/DXExporterFromA1.java

@@ -136,6 +136,7 @@ public class DXExporterFromA1 extends DXExporterFromA3 {
   public DXExporterFromA1 setConformanceLevel(PDFAConformanceLevel newLevel) {
 		return (DXExporterFromA1) super.setConformanceLevel(newLevel);
 	}
+
 	@Override
   public DXExporterFromA1 setProducer(String producer){
 		return (DXExporterFromA1) super.setProducer(producer);

library/src/main/java/org/mustangproject/ZUGFeRD/DXExporterFromA3.java

@@ -71,6 +71,7 @@ import jakarta.activation.FileDataSource;
 public class DXExporterFromA3 extends ZUGFeRDExporterFromA3 {
 
 	protected PDFAConformanceLevel conformanceLevel = PDFAConformanceLevel.UNICODE;
+	protected boolean compressionEnabled = false;
 	protected ArrayList<FileAttachment> fileAttachments = new ArrayList<>();
 
 	/**
@@ -296,8 +297,8 @@ public class DXExporterFromA3 extends ZUGFeRDExporterFromA3 {
 		dict.setString("Desc", description);
 
 		ByteArrayInputStream fakeFile = new ByteArrayInputStream(data);
-		PDEmbeddedFile ef = new PDEmbeddedFile(doc, fakeFile);
+		COSName filter = compressionEnabled ? COSName.FLATE_DECODE : null;
-//		ef.addCompression();
+		PDEmbeddedFile ef = new PDEmbeddedFile(doc, fakeFile, filter);
 		ef.setSubtype(subType);
 		ef.setSize(data.length);
 		ef.setCreationDate(new GregorianCalendar());
@@ -417,7 +418,6 @@ public class DXExporterFromA3 extends ZUGFeRDExporterFromA3 {
 		return this;
 	}
 
-
 	@Override
   public DXExporterFromA3 setCreator(String creator) {
 		this.creator = creator;

library/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExporter.java

@@ -56,6 +56,7 @@ public interface IZUGFeRDExporter extends Closeable, IExporter  {
 	public IZUGFeRDExporter load(InputStream pdfSource) throws IOException;
 	public IZUGFeRDExporter setCreator(String creator);
 	public IZUGFeRDExporter setConformanceLevel(PDFAConformanceLevel newLevel);
+	public IZUGFeRDExporter setEnablePDFAttachmentCompression(boolean enablePDFAttachmentCompression);
 	public IZUGFeRDExporter setProducer(String producer);
 	public IZUGFeRDExporter setZUGFeRDVersion(int version);
 	public boolean ensurePDFIsValid(final DataSource dataSource) throws IOException;

library/src/main/java/org/mustangproject/ZUGFeRD/OXExporterFromA3.java

@@ -129,6 +129,9 @@ public class OXExporterFromA3 extends ZUGFeRDExporterFromA3 {
 
 	private boolean attachZUGFeRDHeaders = true;
 
+	/** Defines whether attachments to the PDF should be using FLATE compression */
+	private boolean compressionEnabled = false;
+
 	/**
 	 * Makes A PDF/A3a-compliant document from a PDF-A1 compliant document (on the
 	 * metadata level, this will not e.g. convert graphics to JPG-2000)
@@ -296,8 +299,8 @@ public class OXExporterFromA3 extends ZUGFeRDExporterFromA3 {
 		dict.setString("Desc", description);
 
 		ByteArrayInputStream fakeFile = new ByteArrayInputStream(data);
-		PDEmbeddedFile ef = new PDEmbeddedFile(doc, fakeFile);
+		COSName filter = compressionEnabled ? COSName.FLATE_DECODE : null;
-//		ef.addCompression();
+		PDEmbeddedFile ef = new PDEmbeddedFile(doc, fakeFile, filter);
 		ef.setSubtype(subType);
 		ef.setSize(data.length);
 		ef.setCreationDate(new GregorianCalendar());

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3.java

@@ -101,6 +101,9 @@ public class ZUGFeRDExporterFromA3 extends XRExporter implements IZUGFeRDExporte
 	private Profile profile = null;
 	protected boolean documentPrepared = false;
 
+	/** Defines whether attachments to the PDF should be using FLATE compression */
+	private boolean compressionEnabled = false;
+
 	/**
 	 * Data (XML invoice) to be added to the ZUGFeRD PDF. It may be externally set,
 	 * in which case passing a IZUGFeRDExportableTransaction is not necessary. By
@@ -392,7 +395,8 @@ public class ZUGFeRDExporterFromA3 extends XRExporter implements IZUGFeRDExporte
 		dict.setString("Desc", description);
 
 		ByteArrayInputStream fakeFile = new ByteArrayInputStream(data);
-		PDEmbeddedFile ef = new PDEmbeddedFile(doc, fakeFile, COSName.FLATE_DECODE);
+		COSName filter = compressionEnabled ? COSName.FLATE_DECODE : null;
+		PDEmbeddedFile ef = new PDEmbeddedFile(doc, fakeFile, filter);
 //		ef.addCompression();
 		ef.setSubtype(subType);
 		ef.setSize(data.length);
@@ -503,6 +507,12 @@ public class ZUGFeRDExporterFromA3 extends XRExporter implements IZUGFeRDExporte
 		return this;
 	}
 
+	@Override
+	public IZUGFeRDExporter setEnablePDFAttachmentCompression(boolean compressionEnabled) {
+		this.compressionEnabled = compressionEnabled;
+		return this;
+	}
+
 
 	public ZUGFeRDExporterFromA3 setCreator(String creator) {
 		this.creator = creator;

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromPDFA.java

@@ -188,6 +188,10 @@ public class ZUGFeRDExporterFromPDFA implements IZUGFeRDExporter {
 		return getExporter().setConformanceLevel(newLevel);
 	}
 
+	public IZUGFeRDExporter setEnablePDFAttachmentCompression(boolean compressionEnabled) {
+		return getExporter().setEnablePDFAttachmentCompression(compressionEnabled);
+	}
+
 	public IZUGFeRDExporter setProducer(String producer) {
 
 		return getExporter().setProducer(producer);