iTextSharp.text.pdf.PdfSmartCopy.CopyIndirect C# (CSharp) Метод

        protected override PdfIndirectReference CopyIndirect(PRIndirectReference inp)
        {
            PdfObject srcObj = PdfReader.GetPdfObjectRelease(inp);
            ByteStore streamKey = null;
            bool validStream = false;
            if (srcObj.IsStream()) {
                streamKey = new ByteStore((PRStream)srcObj);
                validStream = true;
                PdfIndirectReference streamRef;
                if (streamMap.TryGetValue(streamKey, out streamRef)) {
                    return streamRef;
                }
            } else if (srcObj.IsDictionary()) {
                streamKey = new ByteStore((PdfDictionary)srcObj);
                validStream = true;
                PdfIndirectReference streamRef = null;
                if (streamMap.TryGetValue(streamKey, out streamRef)) {
                    return streamRef;
                }
            }

            PdfIndirectReference theRef;
            RefKey key = new RefKey(inp);
            IndirectReferences iRef;
            indirects.TryGetValue(key, out iRef);
            if (iRef != null) {
                theRef = iRef.Ref;
                if (iRef.Copied) {
                    return theRef;
                }
            } else {
                theRef = body.PdfIndirectReference;
                iRef = new IndirectReferences(theRef);
                indirects[key] = iRef;
            }
            if (srcObj != null && srcObj.IsDictionary()) {
                PdfObject type = PdfReader.GetPdfObjectRelease(((PdfDictionary)srcObj).Get(PdfName.TYPE));
                if (type != null && PdfName.PAGE.Equals(type)) {
                    return theRef;
                }
            }
            iRef.SetCopied();

            if (validStream) {
                streamMap[streamKey] = theRef;
            }

            PdfObject obj = CopyObject(srcObj);
            AddToBody(obj, theRef);
            return theRef;
        }