[openbeos] Identifying Text Files

Howdy,

since BeOS seems to have built-in support for recognizing files as text 
files, we want to have the same. I'm about to implement that, missing is 
basically the algorithm deciding whether (or with what probability) a 
buffer of bytes actually contains text.

A simple but maybe a bit ignorant approach would be to check whether the 
buffer contains valid UTF-8 characters only (or more than, say, 95%). But 
maybe someone has better ideas...

CU, Ingo

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