Builderdash.LoadFromPemFileClass.GetIntegerSize C# (CSharp) Method

        private static int GetIntegerSize(BinaryReader binr)
        {
            int count;
            byte bt = binr.ReadByte();

            if (bt != 0x02)       //expect integer
                return 0;
            bt = binr.ReadByte();

            if (bt == 0x81)
                count = binr.ReadByte(); // data size in next byte
            else
                if (bt == 0x82)
                {
                    byte highbyte = binr.ReadByte();
                    byte lowbyte = binr.ReadByte();
                    byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
                    count = BitConverter.ToInt32(modint, 0);
                }
                else
                {
                    count = bt;          // we already have the data size
                }

            while (binr.ReadByte() == 0x00)
            { //remove high order zeros in data
                count -= 1;
            }

            //last ReadByte wasn't a removed zero, so back up a byte
            binr.BaseStream.Seek(-1, SeekOrigin.Current);
            return count;
        }