fix: issue #300: codewords padding for Macro PDF417 barcodes

fixme: test case

openpdf/src/main/java/com/lowagie/text/pdf/BarcodePDF417.java

@@ -862,7 +862,8 @@ else if (codeRows > 90) {
         pad = tot - lenErr - lenCodewords;
         if ((options & PDF417_USE_MACRO) != 0) {
             // the padding comes before the control block
-            System.arraycopy(codewords, macroIndex, codewords, macroIndex + pad, pad);
+            int lenCodewordsAdjusted = lenCodewords = macroIndex;
+            System.arraycopy(codewords, macroIndex, codewords, macroIndex + pad, lenCodewordsAdjusted);
             cwPtr = lenCodewords + pad;
             while (pad-- != 0)
                 codewords[macroIndex++] = TEXT_MODE;

openpdf/src/test/java/com/lowagie/text/pdf/BarcodeMacroPDF417Test.java

@@ -0,0 +1,80 @@
+package com.lowagie.text.pdf;
+
+import com.lowagie.text.Document;
+import com.lowagie.text.Image;
+import com.lowagie.text.Paragraph;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+public class BarcodeMacroPDF417Test {
+    private static final Path OUTPUT_DIR = Paths.get(".", "target", "test-classes");
+    private static final Path COMP_DIR = Paths.get(".", "src", "test", "resources");
+    private static final String FILENAME = "barcode_macro_pdf_417.pdf";
+    private static final int SEGMENT_COUNT = 2;
+
+    @BeforeAll
+    static void setup() {
+        OUTPUT_DIR.toFile().mkdirs();
+        COMP_DIR.toFile().mkdirs();
+    }
+
+    @Test
+    public void testBarcode() throws IOException {
+        generatePdf();
+        Assertions.assertTrue(comparePdf());
+    }
+
+    private void generatePdf() throws IOException {
+        Document document = new Document();
+        OutputStream out = new FileOutputStream(OUTPUT_DIR.resolve(FILENAME).toFile());
+        PdfWriter.getInstance(document, out);
+        document.open();
+
+        String[] testTexts = {"Test PDF417 Segment 0", "Test PDF417 Segment 1"};
+
+        document.add(new Paragraph(testTexts[0]));
+        document.add(getBarcode(testTexts[0], 0));
+
+        for (int i = 0; i < 10; i++) {
+            document.add(new Paragraph(String.format("Test paragraph #%d", i)));
+        }
+
+        document.add(new Paragraph(testTexts[1]));
+        document.add(getBarcode(testTexts[1], 1));
+
+        document.close();
+    }
+
+    private boolean comparePdf() throws IOException {
+        PdfReader outReader = new PdfReader(OUTPUT_DIR.resolve(FILENAME).toString());
+        PdfReader cmpReader = new PdfReader(COMP_DIR.resolve(FILENAME).toString());
+        PdfDictionary outDict = outReader.getPageN(1);
+        PdfDictionary cmpDict = cmpReader.getPageN(1);
+        if (!outDict.getKeys().equals(cmpDict.getKeys())) {
+            return false;
+        }
+        for (PdfName name : outDict.getKeys()) {
+            if (!outDict.get(name).toString().equals(cmpDict.get(name).toString())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private Image getBarcode(String text, int segId) {
+        BarcodePDF417 bp = new BarcodePDF417();
+        bp.setOptions(BarcodePDF417.PDF417_USE_MACRO);
+        bp.setMacroFileId("12");
+        bp.setMacroSegmentCount(SEGMENT_COUNT);
+        bp.setMacroSegmentId(segId);
+        bp.setText(text);
+        return bp.getImage();
+    }
+}