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  1. or download this
    $t = unpack('C', $foo);
if ($t == 0) { $v = unpack('C', substr($foo, 1)) }
elsif ($t == 1) { $v = unpack('S', substr($foo, 1)) }
elsif ($t == 2) { $v = unpack('L', substr($foo, 1)) }
elsif ($t == 3) { $v = unpack('Z*', substr($foo, 1)) }
  2. or download this
    my @unpack_types = qw( C S L Z* );
$t = unpack('C', $foo);
$v = unpack($unpack_types[$t],  substr($foo, 1));  #Is $t always a num
+ber?