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+<?php
+/**
+ * @class ElggFilestore
+ * This class defines the interface for all elgg data repositories.
+ * @author Curverider Ltd
+ */
+abstract class ElggFilestore {
+ /**
+ * Attempt to open the file $file for storage or writing.
+ *
+ * @param ElggFile $file
+ * @param string $mode "read", "write", "append"
+ * @return mixed A handle to the opened file or false on error.
+ */
+ abstract public function open(ElggFile $file, $mode);
+
+ /**
+ * Write data to a given file handle.
+ *
+ * @param mixed $f The file handle - exactly what this is depends on the file system
+ * @param string $data The binary string of data to write
+ * @return int Number of bytes written.
+ */
+ abstract public function write($f, $data);
+
+ /**
+ * Read data from a filestore.
+ *
+ * @param mixed $f The file handle
+ * @param int $length Length in bytes to read.
+ * @param int $offset The optional offset.
+ * @return mixed String of data or false on error.
+ */
+ abstract public function read($f, $length, $offset = 0);
+
+ /**
+ * Seek a given position within a file handle.
+ *
+ * @param mixed $f The file handle.
+ * @param int $position The position.
+ */
+ abstract public function seek($f, $position);
+
+ /**
+ * Return a whether the end of a file has been reached.
+ *
+ * @param mixed $f The file handle.
+ * @return boolean
+ */
+ abstract public function eof($f);
+
+ /**
+ * Return the current position in an open file.
+ *
+ * @param mixed $f The file handle.
+ * @return int
+ */
+ abstract public function tell($f);
+
+ /**
+ * Close a given file handle.
+ *
+ * @param mixed $f
+ */
+ abstract public function close($f);
+
+ /**
+ * Delete the file associated with a given file handle.
+ *
+ * @param ElggFile $file
+ */
+ abstract public function delete(ElggFile $file);
+
+ /**
+ * Return the size in bytes for a given file.
+ *
+ * @param ElggFile $file
+ */
+ abstract public function getFileSize(ElggFile $file);
+
+ /**
+ * Return the filename of a given file as stored on the filestore.
+ *
+ * @param ElggFile $file
+ */
+ abstract public function getFilenameOnFilestore(ElggFile $file);
+
+ /**
+ * Get the filestore's creation parameters as an associative array.
+ * Used for serialisation and for storing the creation details along side a file object.
+ *
+ * @return array
+ */
+ abstract public function getParameters();
+
+ /**
+ * Set the parameters from the associative array produced by $this->getParameters().
+ */
+ abstract public function setParameters(array $parameters);
+
+ /**
+ * Get the contents of the whole file.
+ *
+ * @param mixed $file The file handle.
+ * @return mixed The file contents.
+ */
+ abstract public function grabFile(ElggFile $file);
+
+ /**
+ * Return whether a file physically exists or not.
+ *
+ * @param ElggFile $file
+ */
+ abstract public function exists(ElggFile $file);
+} \ No newline at end of file