--- /dev/null
+<?php
+// Own namespace
+namespace CoreFramework\Filesystem\Pointer;
+
+// Import framework stuff
+use CoreFramework\Stream\Output\StreamableOutput;
+
+/**
+ * An interface for (mostly) file output pointers.
+ *
+ * @author Roland Haeder <webmaster@shipsimu.org>
+ * @version 0.0.0
+ * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2017 Core Developer Team
+ * @license GNU GPL 3.0 or any newer version
+ * @link http://www.shipsimu.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+interface OutputPointer extends StreamableOutput, FilePointer {
+ /**
+ * Write data to a file pointer
+ *
+ * @param $dataStream The data stream we shall write to the file
+ * @return mixed Number of writes bytes or FALSE on error
+ * @throws NullPointerException If the file pointer instance
+ * is not set by setPointer()
+ * @throws InvalidResourceException If there is being set
+ * an invalid file resource
+ */
+ function writeToFile ($dataStream);
+
+ /**
+ * Writes at given position by seeking to it.
+ *
+ * @param $seekPosition Seek position in file
+ * @param $data Data to be written
+ * @return mixed Number of writes bytes or FALSE on error
+ */
+ function writeAtPosition ($seedPosition, $data);
+
+}