rust: BIT_U16 macro utility

(cherry picked from commit 2e46b5d100)

rust/src/core.rs

@@ -48,6 +48,10 @@ pub static mut ALPROTO_FAILED : AppProto = 0; // updated during init
 pub const IPPROTO_TCP : i32 = 6;
 pub const IPPROTO_UDP : i32 = 17;
 
+macro_rules!BIT_U16 {
+    ($x:expr) => (1 << $x);
+}
+
 macro_rules!BIT_U32 {
     ($x:expr) => (1 << $x);
 }
@@ -231,4 +235,4 @@ impl Flow {
             std::time::Duration::new(secs, usecs as u32 * 1000)
         }
     }
-}
+}

rust/src/filecontainer.rs

@@ -24,7 +24,7 @@ use crate::core::*;
 extern {
     pub fn FileFlowToFlags(flow: *const Flow, flags: u8) -> u16;
 }
-pub const FILE_USE_DETECT:    u16 = 0x2000;
+pub const FILE_USE_DETECT:    u16 = BIT_U16!(13);
 
 
 pub struct File;