Add support for random-generating primitives

include/zenoh_commons.h

@@ -1909,6 +1909,11 @@ ZENOHC_API struct z_owned_queryable_t z_queryable_null(void);
  * Constructs the default value for :c:type:`z_query_reply_options_t`.
  */
 ZENOHC_API struct z_queryable_options_t z_queryable_options_default(void);
+ZENOHC_API void z_random_fill(void *buf, size_t len);
+ZENOHC_API uint16_t z_random_u16(void);
+ZENOHC_API uint32_t z_random_u32(void);
+ZENOHC_API uint64_t z_random_u64(void);
+ZENOHC_API uint8_t z_random_u8(void);
 /**
  * Calls the closure. Calling an uninitialized closure is a no-op.
  */

src/platform/mod.rs

@@ -14,3 +14,6 @@
 
 pub use synchronization::*;
 mod synchronization;
+
+pub use random::*;
+mod random;

src/platform/random.rs

@@ -0,0 +1,34 @@
+use std::slice::from_raw_parts_mut;
+
+use libc::c_void;
+use rand::{random, thread_rng, RngCore};
+
+#[no_mangle]
+pub extern "C" fn z_random_u8() -> u8 {
+    random::<u8>()
+}
+
+#[no_mangle]
+pub extern "C" fn z_random_u16() -> u16 {
+    random::<u16>()
+}
+
+#[no_mangle]
+pub extern "C" fn z_random_u32() -> u32 {
+    random::<u32>()
+}
+
+#[no_mangle]
+pub extern "C" fn z_random_u64() -> u64 {
+    random::<u64>()
+}
+
+#[no_mangle]
+#[allow(clippy::missing_safety_doc)]
+pub unsafe extern "C" fn z_random_fill(buf: *mut c_void, len: usize) {
+    if buf.is_null() || len == 0 {
+        return;
+    }
+    let b: &mut [u8] = from_raw_parts_mut(buf as *mut u8, len);
+    thread_rng().fill_bytes(b);
+}