func readFull(r io.Reader, buf []byte) error {
	_, err := io.ReadFull(r, buf)
	if err == io.EOF {
		return io.ErrUnexpectedEOF
	}
	return err
}
func readFull(r io.Reader, buf []byte) error {
	_, err := io.ReadFull(r, buf)
	if err == io.EOF {
		return io.ErrUnexpectedEOF
	}
	return err
}
func readFull ( r io . Reader , buf [ ] byte ) error { _ , err := io . ReadFull ( r , buf ) if err == io . EOF { return io . ErrUnexpectedEOF } return err }
// readFull wraps io.ReadFull to return io.ErrUnexpectedEOF instead
// of io.EOF when 0 bytes are read.
readFull wraps io . ReadFull to return io . ErrUnexpectedEOF instead of io . EOF when 0 bytes are read .