+ if (is_file($file) && !is_writeable($file)) {
+ // The datastore exists but is not writeable
+ throw new IOException($file);
+ } else if (!is_file($file) && !is_writeable(dirname($file))) {
+ // The datastore does not exist and its parent directory is not writeable
+ throw new IOException(dirname($file));
+ }
+
+ return file_put_contents(
+ $file,
+ self::$phpPrefix.base64_encode(gzdeflate(serialize($content))).self::$phpSuffix
+ );
+ }
+
+ /**
+ * Read data from a file containing Shaarli database format content.
+ *
+ * If the file isn't readable or doesn't exist, default data will be returned.
+ *
+ * @param string $file File path.
+ * @param mixed $default The default value to return if the file isn't readable.
+ *
+ * @return mixed The content unserialized, or default if the file isn't readable, or false if it fails.
+ */
+ public static function readFlatDB($file, $default = null)
+ {
+ // Note that gzinflate is faster than gzuncompress.
+ // See: http://www.php.net/manual/en/function.gzdeflate.php#96439
+ if (! is_readable($file)) {
+ return $default;
+ }
+
+ $data = file_get_contents($file);
+ if ($data == '') {
+ return $default;
+ }
+
+ return unserialize(
+ gzinflate(
+ base64_decode(
+ substr($data, strlen(self::$phpPrefix), -strlen(self::$phpSuffix))
+ )
+ )
+ );