1 files changed, 6 insertions, 1 deletions

diff --git a/src/stream.h b/src/stream.h
index 086e4a1..32e5432 100644
--- a/src/stream.h
+++ b/src/stream.h
@@ -12,7 +12,12 @@ public:
 
         virtual void close() = 0;
         virtual size_t read( char *pBuf, size_t nBytes ) = 0;
-        virtual size_t write( char *pBuf, size_t nBytes ) = 0;
+        virtual size_t write( const char *pBuf, size_t nBytes ) = 0;
+
+        virtual long tell() = 0;
+        virtual void seek( long offset ) = 0;
+        virtual void setPos( long pos ) = 0;
+        virtual void setPosEnd( long pos ) = 0;
 
 private: