# use constant Max_Num_32_bit => 2 ** 32;
# Use:                                     ## n - number of 64bit packed numbers in string
# my @Numbers = UnPack( n, $stringpack );  ## string input, array output

sub UnPack {
    my ( $todo, $input ) = @_;
    if ( @_ != 2 || length $input < $todo * 8 ) {
        warn "Invalid input for UnPack()\n";
        return;
        }
    my @output;
    for my $arno ( 0 .. $todo - 1 ) {
        my $pack = substr $input, $arno * 8, 8;
        my ( $upper, $lower ) = unpack 'N N', $pack;
        push @output, $upper * Max_Num_32_bit + $lower ;
        }
    return @output;
    }