iTextSharp.text.pdf.PdfPages.WritePageTree C# (CSharp) Метод

        internal PdfIndirectReference WritePageTree()
        {
            if (pages.Count == 0)
                throw new IOException(MessageLocalization.GetComposedMessage("the.document.has.no.pages"));
            int leaf = 1;
            List<PdfIndirectReference> tParents = parents;
            List<PdfIndirectReference> tPages = pages;
            List<PdfIndirectReference> nextParents = new List<PdfIndirectReference>();
            while (true) {
                leaf *= leafSize;
                int stdCount = leafSize;
                int rightCount = tPages.Count % leafSize;
                if (rightCount == 0)
                    rightCount = leafSize;
                for (int p = 0; p < tParents.Count; ++p) {
                    int count;
                    int thisLeaf = leaf;
                    if (p == tParents.Count - 1) {
                        count = rightCount;
                        thisLeaf = pages.Count % leaf;
                        if (thisLeaf == 0)
                            thisLeaf = leaf;
                    }
                    else
                        count = stdCount;
                    PdfDictionary top = new PdfDictionary(PdfName.PAGES);
                    top.Put(PdfName.COUNT, new PdfNumber(thisLeaf));
                    PdfArray kids = new PdfArray();
                    List<PdfObject> intern = kids.ArrayList;
                    foreach (PdfObject obb in tPages.GetRange(p * stdCount, count))
                        intern.Add(obb);
                    top.Put(PdfName.KIDS, kids);
                    if (tParents.Count > 1) {
                        if ((p % leafSize) == 0)
                            nextParents.Add(writer.PdfIndirectReference);
                        top.Put(PdfName.PARENT, nextParents[p / leafSize]);
                    }
                    writer.AddToBody(top, tParents[p]);
                }
                if (tParents.Count == 1) {
                    topParent = tParents[0];
                    return topParent;
                }
                tPages = tParents;
                tParents = nextParents;
                nextParents = new List<PdfIndirectReference>();
            }
        }