{
                if ((tagNo >>> 24) != 0)
                {
                    throw new IOException("Tag number more than 31 bits");
                }

                tagNo <<= 7;

                b = s.read();
                if (b < 0)
                {
                    throw new EOFException("EOF found inside tag value.");
                }

                tagNo |= (b & 0x7f);
            }