I see a brother has pointed out the issue with == alignment. Another point to make is that reading the file as a whole can indeed simplify parsing. Consider: 

$data = do{ undef $/; <$fh> };

while ($data =~ m/==/) {
    ($rec, $data) = unpack("n/A A*", $');
    process($rec);
}

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In reply to Re: Reading binary file in perl having records of different length by Anonymous Monk
in thread Reading binary file in perl having records of different length by jaypal

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