Fix issue with Reading state.

Author: pavel-alay

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

@@ -896,16 +896,19 @@ protected PdfDictionary readXrefSection() throws IOException {
         int end = 0;
         while (true) {
             tokens.nextValidToken();
-            if (tokens.tokenValueEqualsTo(PdfTokenizer.Trailer))
+            if (tokens.tokenValueEqualsTo(PdfTokenizer.Trailer)) {
                 break;
-            if (tokens.getTokenType() != PdfTokenizer.TokenType.Number)
+            }
+            if (tokens.getTokenType() != PdfTokenizer.TokenType.Number) {
                 tokens.throwError(PdfException.ObjectNumberOfTheFirstObjectInThisXrefSubsectionNotFound);
+            }
             int start = tokens.getIntValue();
             tokens.nextValidToken();
-            if (tokens.getTokenType() != PdfTokenizer.TokenType.Number)
+            if (tokens.getTokenType() != PdfTokenizer.TokenType.Number) {
                 tokens.throwError(PdfException.NumberOfEntriesInThisXrefSubsectionNotFound);
+            }
             end = tokens.getIntValue() + start;
-            for (int num = start; num < end; ++num) {
+            for (int num = start; num < end; num++) {
                 tokens.nextValidToken();
                 long pos = tokens.getLongValue();
                 tokens.nextValidToken();
@@ -916,6 +919,7 @@ protected PdfDictionary readXrefSection() throws IOException {
                     reference = new PdfIndirectReference(pdfDocument, num, gen, pos);
                 } else if (reference.checkState(PdfObject.Reading) && reference.getGenNumber() == gen) {
                     reference.setOffset(pos);
+                    reference.clearState(PdfObject.Reading);
                 } else {
                     continue;
                 }

core/src/main/java/com/itextpdf/core/pdf/PdfXrefTable.java

@@ -7,7 +7,6 @@
 import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Set;
 import java.util.TreeSet;
 
 class PdfXrefTable {
@@ -189,7 +188,7 @@ protected void writeXrefTableAndTrailer(PdfDocument document, PdfObject fileId,
             xrefStream.put(PdfName.Root, document.getCatalog().getPdfObject());
             PdfArray index = new PdfArray();
             for (Integer section : sections) {
-                index.add(new PdfNumber(section.intValue()));
+                index.add(new PdfNumber(section));
             }
             if (document.appendMode) {
                 PdfNumber lastXref = new PdfNumber(document.reader.getLastXref());

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

@@ -1486,10 +1486,9 @@ public void zeroUpdateTest() throws IOException {
 //      trailer
 //      <</Size 27/Root 1 0 R/Info 12 0 R//Prev 245232/XRefStm 244927>>
 //      startxref
-
         Assert.assertFalse(reader.hasFixedXref());
         Assert.assertFalse(reader.hasRebuiltXref());
-
+        Assert.assertTrue(((PdfDictionary)pdfDoc.getPdfObject(1)).containsKey(PdfName.AcroForm));
         pdfDoc.close();
     }