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Params
------
fin : binary file with `read(buf_size : int)` method
fout : binary file with `write` (and optionally `flush`) methods.
callback : function(float), e.g.: `tqdm.update`
callback_len : If (default: True) do `callback(len(buffer))`.
Otherwise, do `callback(data) for data in buffer.split(delim)`.
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