LimitWriter is a copy of the standard library ioutils.LimitReader, applied to the writer interface. LimitWriter returns a Writer that writes to w but stops with EOF after n bytes. The underlying implementation is a *LimitedWriter.
WriteCloserWrapper returns a writeCloserWrapper.
A LimitedWriter writes to W but limits the amount of data returned to just N bytes. Each call to Write updates N to reflect the new amount remaining. Write returns EOF when N <= 0 or when the underlying W returns EOF.