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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def fromtarfile(cls, tarfile):
 """Return the next TarInfo object from TarFile object tarfile. """

        buf = tarfile.fileobj.read(BLOCKSIZE)
        obj = cls.frombuf(buf, tarfile.encoding, tarfile.errors)
        obj.offset = tarfile.fileobj.tell() - BLOCKSIZE
        return obj._proc_member(tarfile)