iTextSharp.text.pdf.AcroFields.FindSignatureNames C# (CSharp) Метод

        private void FindSignatureNames() {
            if (sigNames != null)
                return;
            sigNames = new Hashtable();
            ArrayList sorter = new ArrayList();
            foreach (DictionaryEntry entry in fields) {
                Item item = (Item)entry.Value;
                PdfDictionary merged = item.GetMerged(0);
                if (!PdfName.SIG.Equals(merged.Get(PdfName.FT)))
                    continue;
                PdfDictionary v = merged.GetAsDict(PdfName.V);
                if (v == null)
                    continue;
                PdfString contents = v.GetAsString(PdfName.CONTENTS);
                if (contents == null)
                    continue;
                PdfArray ro = v.GetAsArray(PdfName.BYTERANGE);
                if (ro == null)
                    continue;
                int rangeSize = ro.Size;
                if (rangeSize < 2)
                    continue;
                int length = ro.GetAsNumber(rangeSize - 1).IntValue + ro.GetAsNumber(rangeSize - 2).IntValue;
                sorter.Add(new Object[]{entry.Key, new int[]{length, 0}});
            }
            sorter.Sort(new AcroFields.ISorterComparator());
            if (sorter.Count > 0) {
                if (((int[])((Object[])sorter[sorter.Count - 1])[1])[0] == reader.FileLength)
                    totalRevisions = sorter.Count;
                else
                    totalRevisions = sorter.Count + 1;
                for (int k = 0; k < sorter.Count; ++k) {
                    Object[] objs = (Object[])sorter[k];
                    String name = (String)objs[0];
                    int[] p = (int[])objs[1];
                    p[1] = k + 1;
                    sigNames[name] = p;
                }
            }
        }