So let's assume I have a file stored somewhere and it can be either a jpeg
file or a png
file, what is the way to check what it is?
Should I simply check the extension? Or should I read the file's binary signature? Or how do I do it?
Update: 4/2/2016 to include .JPG validation .
There's a fairly popular hex package Arc that might work for you. Extracted from Arc:
def validate({file, _}) do
~w(.jpg .jpeg .gif .png .JPG) |> Enum.member?(Path.extname(file.file_name))
end
I guess you could extract the Magic number of the file and analyse it. That's fairly simple once you have the format specs
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