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How check File is corrupted or not in APEX

Hi All,

I need to upload a doc /attachment by custom VF and Apex. I could able to that.
But now I need to check the choosen file is a corrupted file or not / or it might be affected by virus or not.
some  security checking like above.
I could not able to find out any such method for security checking of a File.

If any body knows , please help me immidiately



Thanks is advance