Quote:
Originally Posted by JSWolf
But how do we know the file is broken and not the implementation of the reading software?
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We do not know that. But we do not know that it is broken either. It is in many cases not even possible to know if it is broken since a formal specification of the format is either secret or more probably do not exist.
My point was that you cannot use an implementation and how a file works in that implementation to say if the file is a correct file or not.