question: public static boolean equals ( byte [ ] [ ] field1 , byte [ ] [ ] field2 ) { int index1 = 0 ; int length1 = field1 == null ? 0 : field1 . length ; int index2 = 0 ; int length2 = field2 == null ? 0 : field2 . length ; while ( true ) { while ( index1 < length1 && field1 [ index1 ] == null ) { index1 ++ ; } while ( index2 < length2 && field2 [ index2 ] == null ) { index2 ++ ; } boolean atEndOf1 = index1 >= length1 ; boolean atEndOf2 = index2 >= length2 ; if ( atEndOf1 && atEndOf2 ) { return true ; } else if ( atEndOf1 != atEndOf2 ) { return false ; } else if ( ! Arrays . equals ( field1 [ index1 ] , field2 [ index2 ] ) ) { return false ; } index1 ++ ; index2 ++ ; } }
target:  Checks repeated bytes field equality. Only non-null elements are tested. Returns true if the two fields have the same sequence of non-null elements. Null-value fields and fields of any length with only null elements are considered equal.