How to recognize file type (bytearray type)

Hi,
what ist the simplest way to detect file type or the type of byte[ ]? I mean, for example, how to detect if a "xyz.pdf" is a "really" PDF-File and not some Jpg with ".pfd"-extension.
Thanx in advance
vedran

but there must be a easy wayIn general there is no requirement that a bunch of bytes belong to
some unique "type". So there is no way to retrieve that type and, in
particular, no easy way.
If you want some pragmatic test (and I'm assuming that pdf was
just an example - you want something general), you could have a
look at the nix file command. It is open source and comes with
a big set of useful files describing file headers. It is open source and
can be seen, for example, here: ftp://ftp.gw.com/mirrors/pub/unix/file/

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How to recognize file type (bytearray type)

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