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  1. or download this
        # Parse header
    my ($sig, $ver, $cnt, $reserved) = unpack('l4', $raw);

    # TODO: validate (signature, reverse byte order, version)
    return {SIG => $sig, VER => $ver, CNT => $cnt, RSV => $reserved};
  2. or download this
    for my $template ("N", "V") {
    # Parse header
...
}
# no match: not a .2bit header
return undef;