iTextSharp.text.pdf.PdfCopy.SetFromReader C# (CSharp) Метод

        protected void SetFromReader(PdfReader reader)
        {
            this.reader = reader;
            indirectMap.TryGetValue(reader, out indirects);
            if (indirects == null) {
                indirects = new Dictionary<RefKey,IndirectReferences>();
                indirectMap[reader] = indirects;
                PdfDictionary catalog = reader.Catalog;
                PRIndirectReference refi = null;
                PdfObject o = catalog.Get(PdfName.ACROFORM);
                if (o == null || o.Type != PdfObject.INDIRECT)
                    return;
                refi = (PRIndirectReference)o;
                if (acroForm == null) acroForm = body.PdfIndirectReference;
                indirects[new RefKey(refi)] =  new IndirectReferences(acroForm);
            }
        }