iTextSharp.text.pdf.PdfReader.ReadXref C# (CSharp) Метод

        protected internal void ReadXref() {
            hybridXref = false;
            newXrefType = false;
            tokens.Seek(tokens.Startxref);
            tokens.NextToken();
            if (!tokens.StringValue.Equals("startxref"))
                throw new InvalidPdfException("startxref not found.");
            tokens.NextToken();
            if (tokens.TokenType != PRTokeniser.TK_NUMBER)
                throw new InvalidPdfException("startxref is not followed by a number.");
            int startxref = tokens.IntValue;
            lastXref = startxref;
            eofPos = tokens.FilePointer;
            try {
                if (ReadXRefStream(startxref)) {
                    newXrefType = true;
                    return;
                }
            }
            catch {}
            xref = null;
            tokens.Seek(startxref);
            trailer = ReadXrefSection();
            PdfDictionary trailer2 = trailer;
            while (true) {
                PdfNumber prev = (PdfNumber)trailer2.Get(PdfName.PREV);
                if (prev == null)
                    break;
                tokens.Seek(prev.IntValue);
                trailer2 = ReadXrefSection();
            }
        }