iTextSharp.text.pdf.RandomAccessFileOrArray.ReadUnsignedInt C# (CSharp) Метод

        public long ReadUnsignedInt()
        {
            long ch1 = this.Read();
            long ch2 = this.Read();
            long ch3 = this.Read();
            long ch4 = this.Read();
            if ((ch1 | ch2 | ch3 | ch4) < 0)
                throw new EndOfStreamException();
            return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
        }

 private static long ReadUnsignedInt(RandomAccessFileOrArray stream,
 bool isBigEndian)
 {
     if (isBigEndian) {
         return stream.ReadUnsignedInt();
     } else {
         return stream.ReadUnsignedIntLE();
     }
 }