Index: MediaReadOnlyStreamWrapper.inc
===================================================================
--- MediaReadOnlyStreamWrapper.inc	(revision 19506)
+++ MediaReadOnlyStreamWrapper.inc	(working copy)
@@ -2,33 +2,6 @@
 // $Id: MediaReadOnlyStreamWrapper.inc,v 1.2 2010/04/07 06:29:34 JacobSingh Exp $
 
 /**
- * Generic PHP stream wrapper interface.
- *
- * @see http://www.php.net/manual/en/class.streamwrapper.php
- */
-interface MediaReadOnlyStreamWrapperInterface {
-  public function stream_open($uri, $mode, $options, &$opened_url);
-  public function stream_close();
-  public function stream_lock($operation);
-  public function stream_read($count);
-  public function stream_write($data);
-  public function stream_eof();
-  public function stream_seek($offset, $whence);
-  public function stream_flush();
-  public function stream_tell();
-  public function stream_stat();
-//   public function unlink($uri);
-//   public function rename($from_uri, $to_uri);
-//   public function mkdir($uri, $mode, $options);
-//   public function rmdir($uri, $options);
-  public function url_stat($uri, $flags);
-  public function dir_opendir($uri, $options);
-  public function dir_readdir();
-  public function dir_rewinddir();
-  public function dir_closedir();
-}
-
-/**
  * A base class for Resource Stream Wrappers.
  *
  * This class provides a complete stream wrapper implementation. It passes
@@ -39,7 +12,7 @@
  * interpolateUrl method to rewrite the URL before is it passed back into the
  * calling function.
  */
-abstract class MediaReadOnlyStreamWrapper implements MediaReadOnlyStreamWrapperInterface {
+abstract class MediaReadOnlyStreamWrapper implements DrupalStreamWrapperInterface {
   protected $parameters = array();
   protected $base_url = NULL;
   private $_DEBUG_MODE = NULL;
@@ -482,6 +455,31 @@
     return '';
   }
 
+  /**
+   * DrupalStreamWrapperInterface requires that these methods be implemented,
+   * but none of them apply to a read-only stream wrapper. On failure they
+   * are expected to return FALSE.
+   */
+
+  public function unlink($uri) {
+    return FALSE;
+  }
+  public function rename($from_uri, $to_uri) {
+    return FALSE;
+  }
+  public function mkdir($uri, $mode, $options) {
+    return FALSE;
+  }
+  public function rmdir($uri, $options) {
+    return FALSE;
+  }
+  public function chmod($mode) {
+    return FALSE;
+  }
+  public function dirname($uri = NULL) {
+    return FALSE;
+  }
+
 }