def _read(self):
filepos = self._fp.tell()<EOL>if filepos < <NUM_LIT:1>:<EOL><INDENT>return "<STR_LIT>"<EOL><DEDENT>destpos = max(filepos - self._chunk_size, <NUM_LIT:0>)<EOL>self._fp.seek(destpos)<EOL>buf = self._fp.read(filepos - destpos)<EOL>self._fp.seek(destpos)<EOL>return buf<EOL>
Reads and returns a buffer reversely from current file-pointer position.

:rtype : str