internal PageStamp(PdfStamperImp stamper, PdfReader reader, PdfDictionary pageN) {
     this.pageN = pageN;
     pageResources = new PageResources();
     PdfDictionary resources = pageN.GetAsDict(PdfName.RESOURCES);
     pageResources.SetOriginalResources(resources, stamper.namePtr);
 }

 /** Creates a new instance of StampContent */
 internal StampContent(PdfStamperImp stamper, PdfStamperImp.PageStamp ps)
     : base(stamper)
 {
     this.ps = ps;
     pageResources = ps.pageResources;
 }

 /**
  * Constructs XmlSignatureAppearance object.
  * @param writer the writer to which the signature will be written.
  */
 internal XmlSignatureAppearance(PdfStamperImp writer) {
     this.writer = writer;
 }

 internal static void MergeResources(PdfDictionary result, PdfDictionary source, PdfStamperImp writer) {
     PdfDictionary dic = null;
     PdfDictionary res = null;
     PdfName target = null;
     for (int k = 0; k < mergeTarget.Length; ++k) {
         target = mergeTarget[k];
         PdfDictionary pdfDict = source.GetAsDict(target);
         if ((dic = pdfDict) != null) {
             if ((res = (PdfDictionary)PdfReader.GetPdfObject(result.Get(target), result)) == null) {
                 res = new PdfDictionary();
             }
             res.MergeDifferent(dic);
             result.Put(target, res);
             if (writer != null)
                 writer.MarkUsed(res);
         }
     }
 }

 /**
  * Constructs a PdfSignatureAppearance object.
  * @param writer    the writer to which the signature will be written.
  */
 public PdfSignatureAppearance(PdfStamperImp writer) {
     this.writer = writer;
     signDate = DateTime.Now;
     fieldName = GetNewSigName();
     signatureCreator = Version.GetInstance().GetVersion;
 }