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> On Tue, Apr 30, 2013 at 12:51 PM, Luiz Henrique de Figueiredo
> <lhf@tecgraf.puc-rio.br> wrote:
> > f = io.open("foo.mp3","rb")
> > h = f:read(128)
> > f:close()
> 
> Isn't h the first 128 bytes in this instance rather than the last 128 bytes?

Oops, I missed that. You need to seek before reading:
	f:seek("end",-128)
	h = f:read(128)