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my $hex = "d0cf11e0a1b11ae1000000000000000001000000feffffff00000000370
+00000ffffffff";
my $bin = pack "H*", $hex;
...
    # last if $val == -1;
    print "val=$val\n";
}

val=-535703600
val=-518344287
...
val=0
val=55
val=-1

val=3759263696
val=3776623009
...
val=0
val=55
val=4294967295