question: protected int read ( ) throws IOException { if ( offset == buffer . length ) { throw new ASN1Exception ( "Unexpected end of encoding" ) ; } if ( in == null ) { return buffer [ offset ++ ] & 0xFF ; } else { int octet = in . read ( ) ; if ( octet == - 1 ) { throw new ASN1Exception ( "Unexpected end of encoding" ) ; } buffer [ offset ++ ] = ( byte ) octet ; return octet ; } }
target:  Reads the next encoded byte from the encoded input stream.