Merge branch 'hotfix/hotfix2186' into develop

Author: joris.schellekens

kernel/src/main/java/com/itextpdf/kernel/pdf/PdfReader.java

@@ -808,7 +808,7 @@ protected PdfDictionary readXrefSection() throws IOException {
                 tokens.nextValidToken();
                 int gen = tokens.getIntValue();
                 tokens.nextValidToken();
-                if (pos == 0L && gen == 65535 && num == 1) {
+                if (pos == 0L && gen == 65535 && num == 1 && start != 0) {
                     // Very rarely can an XREF have an incorrect start number. (SUP-1557)
                     // e.g.
                     // xref

kernel/src/test/java/com/itextpdf/kernel/pdf/PdfReaderTest.java

@@ -46,6 +46,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.io.source.ByteArrayOutputStream;
 import com.itextpdf.io.source.ByteUtils;
 import com.itextpdf.kernel.PdfException;
+import com.itextpdf.kernel.utils.CompareTool;
 import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.LogMessage;
 import com.itextpdf.test.annotations.LogMessages;
@@ -1477,6 +1478,28 @@ public void freeReferencesTest() throws IOException {
         pdfDoc.close();
     }
 
+    @Test
+    public void freeReferencesTest02() throws IOException, InterruptedException {
+
+        String cmpFile = sourceFolder + "cmp_freeReferences02.pdf";
+        String outputFile = destinationFolder + "freeReferences02.pdf";
+        String inputFile = sourceFolder + "freeReferences02.pdf";
+
+        PdfWriter writer = new PdfWriter(outputFile);
+        PdfReader reader = new PdfReader(inputFile);
+
+        PdfDocument inputPdfDocument = new PdfDocument(reader);
+        PdfDocument outputPdfDocument = new PdfDocument(writer);
+
+        int lastPage = inputPdfDocument.getNumberOfPages();
+        inputPdfDocument.copyPagesTo(lastPage, lastPage, outputPdfDocument);
+
+        inputPdfDocument.close();
+        outputPdfDocument.close();
+
+        Assert.assertNull(new CompareTool().compareByContent(outputFile, cmpFile, destinationFolder, "diff_"));
+    }
+
     @Test
     public void pdfVersionTest() throws IOException {
         String filename = sourceFolder + "hello.pdf";