Avoid integer overflow when calculating the size of very big images.

Changelog

@@ -1,3 +1,8 @@
+2003-07-17  Henning Meier-Geinitz <henning@meier-geinitz.de>
+	
+	* src/xscanimage.c: Avoid integer overflow when calculating the
+	  size of very big images.
+	
 2003-06-25  Henning Meier-Geinitz <henning@meier-geinitz.de>
 
 	* configure configure.in src/xscanimage.c: Fix for API-change in

src/xscanimage.c

@@ -461,7 +461,7 @@ update_param (GSGDialog *dialog, void *arg)
   if (sane_get_parameters (gsg_dialog_get_device (dialog), &params)
       == SANE_STATUS_GOOD)
     {
-      double size = params.bytes_per_line * params.lines;
+      double size = (double) params.bytes_per_line * (double) params.lines;
       const char *unit = "B";
 
       if (params.lines == -1)