question: protected byte [ ] toDb ( byte [ ] b , boolean alwaysValid ) { byte [ ] ret = new byte [ b . length + 1 ] ; System . arraycopy ( b , 0 , ret , 1 , b . length ) ; if ( ! alwaysValid && b . length == 0 ) { ret [ 0 ] = COMPLETE ; } else { ret [ 0 ] = INCOMPLETE ; } return ret ; }
target:  Prepends the byte array with a value that indicates if this range is complete.