CString foo;

file.Read( foo );
to read the entire file

stepmania/src/RageFile.h

@@ -61,7 +61,7 @@ public:
     
 	/* Raw I/O: */
 	int Read( void *buffer, size_t bytes );
-	int Read( CString &buffer, size_t bytes );
+	int Read( CString &buffer, int bytes = -1 );
 	int Write( const void *buffer, size_t bytes );
 	int Write( const CString& string ) { return Write( string.data(), string.size() ); }
 	int Flush();