iTextSharp.text.pdf.PRTokeniser.CheckFdfHeader C# (CSharp) Метод

        public void CheckFdfHeader() {
            file.StartOffset = 0;
            String str = ReadString(1024);
            int idx = str.IndexOf("%FDF-1.2");
            if (idx < 0)
                throw new IOException("FDF header signature not found.");
            file.StartOffset = idx;
        }