rust/json: expose more of jansson to rust

rust/src/json.rs

@@ -35,6 +35,7 @@ extern {
 
     fn json_string(value: *const c_char) -> *mut JsonT;
     fn json_integer(val: u64) -> *mut JsonT;
+    fn SCJsonDecref(value: *mut JsonT);
     fn SCJsonBool(val: bool) -> *mut JsonT;
 }
 
@@ -44,6 +45,10 @@ pub struct Json {
 
 impl Json {
 
+    pub fn decref(val: Json) {
+        unsafe{SCJsonDecref(val.js)};
+    }
+
     pub fn object() -> Json {
         return Json{
             js: unsafe{json_object()},
@@ -56,6 +61,18 @@ impl Json {
         }
     }
 
+    pub fn string(val: &str) -> Json {
+        return Json{
+            js: unsafe{json_string(to_cstring(val.as_bytes()).as_ptr())}
+        };
+    }
+
+    pub fn string_from_bytes(val: &[u8]) -> Json {
+        return Json{
+            js: unsafe{json_string(to_cstring(val).as_ptr())}
+        };
+    }
+
     pub fn unwrap(&self) -> *mut JsonT {
         return self.js;
     }

src/output-json.c

@@ -108,6 +108,15 @@ json_t *SCJsonBool(int val)
     return (val ? json_true() : json_false());
 }
 
+/**
+ * Wrap json_decref. This is mainly to expose this function to Rust as its
+ * defined in the Jansson header file as an inline function.
+ */
+void SCJsonDecref(json_t *json)
+{
+    json_decref(json);
+}
+
 /* Default Sensor ID value */
 static int64_t sensor_id = -1; /* -1 = not defined */
 

src/output-json.h

@@ -67,6 +67,7 @@ typedef struct OutputJsonCtx_ {
 } OutputJsonCtx;
 
 json_t *SCJsonBool(int val);
+void SCJsonDecref(json_t *js);
 
 #endif /* HAVE_LIBJANSSON */