feat(util): add random_string/random_num

src/engine/mod.rs

@@ -143,9 +143,11 @@ impl Drop for UnQlite {
 }
 
 pub use self::config::*;
+pub use self::util::*;
 
 mod openmode;
 mod config;
+mod util;
 
 #[cfg(test)]
 #[cfg(feature = "enable-threads")]

src/engine/util.rs

@@ -0,0 +1,24 @@
+use super::UnQlite;
+use ffi::{unqlite_util_random_num, unqlite_util_random_string};
+
+impl <'util> UnQlite {
+    /// Generate random string using the UnQLite PRNG.
+    ///
+    /// It will generate a english alphabet based string of length buf_size (last argument).
+    fn random_string(&self, buf_size: u32) -> Vec<u8> {
+        unsafe {
+            let mut vec: Vec<u8> = Vec::with_capacity(buf_size as usize);
+            error_or!(unqlite_util_random_string(self.db, vec.as_mut_ptr() as *mut i8, buf_size)).unwrap();
+            vec
+        }
+    }
+
+    /// Generate random number using the UnQLite PRNG.
+    ///
+    /// It will return a 32-bit unsigned integer between 0 and 0xFFFFFFFF.
+    fn random_num(&self) -> u32 {
+        unsafe {
+            unqlite_util_random_num(self.db)
+        }
+    }
+}