1 files changed, 5 insertions, 1 deletions

diff --git a/src/filter.h b/src/filter.h
index 088d46e..7bb04bc 100644
--- a/src/filter.h
+++ b/src/filter.h
@@ -40,12 +40,16 @@ namespace Bu
                 virtual void setPos( long pos );
                 virtual void setPosEnd( long pos );
                 virtual bool isEOS();
+                virtual bool isOpen();
 
                 virtual void flush();
 
                 virtual bool canRead();
                 virtual bool canWrite();
-                virtual bool canSeek();
+
+                virtual bool isReadable();
+                virtual bool isWritable();
+                virtual bool isSeekable();
 
                 virtual bool isBlocking();
                 virtual void setBlocking( bool bBlocking=true );