iTextSharp.text.pdf.PdfReader.PageRefs.GetPageOrigRef C# (CSharp) Метод

            public PRIndirectReference GetPageOrigRef(int pageNum) {
                --pageNum;
                if (pageNum < 0 || pageNum >= Size)
                    return null;
                if (refsn != null)
                    return (PRIndirectReference)refsn[pageNum];
                else {
                    int n = refsp[pageNum];
                    if (n == 0) {
                        PRIndirectReference refi = GetSinglePage(pageNum);
                        if (reader.lastXrefPartial == -1)
                            lastPageRead = -1;
                        else
                            lastPageRead = pageNum;
                        reader.lastXrefPartial = -1;
                        refsp[pageNum] = refi.Number;
                        if (keepPages)
                            lastPageRead = -1;
                        return refi;
                    }
                    else {
                        if (lastPageRead != pageNum)
                            lastPageRead = -1;
                        if (keepPages)
                            lastPageRead = -1;
                        return new PRIndirectReference(reader, n);
                    }
                }
            }