From 5976e3abda846075540fe37731af354f64e3e8ed Mon Sep 17 00:00:00 2001
From: finiteprods <kwok.doc@gmail.com>
Date: Wed, 3 Feb 2021 10:56:47 +0100
Subject: [PATCH] restore FFI set_scalar

---
 rust/xaynet-mobile/src/ffi/settings.rs | 7 +++----
 rust/xaynet-mobile/src/settings.rs     | 9 ++++++---
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/rust/xaynet-mobile/src/ffi/settings.rs b/rust/xaynet-mobile/src/ffi/settings.rs
index 34a165dfd..98ee990cb 100644
--- a/rust/xaynet-mobile/src/ffi/settings.rs
+++ b/rust/xaynet-mobile/src/ffi/settings.rs
@@ -1,4 +1,4 @@
-use std::os::raw::{c_int, c_uint};
+use std::os::raw::{c_double, c_int};
 
 use ffi_support::{ByteBuffer, FfiStr};
 use xaynet_core::crypto::{ByteObject, PublicSigningKey, SecretSigningKey, SigningKeyPair};
@@ -82,12 +82,11 @@ pub unsafe extern "C" fn xaynet_ffi_settings_new() -> *mut Settings {
 #[no_mangle]
 pub unsafe extern "C" fn xaynet_ffi_settings_set_scalar(
     settings: *mut Settings,
-    numer: c_uint,
-    denom: c_uint,
+    scalar: c_double,
 ) -> c_int {
     match unsafe { settings.as_mut() } {
         Some(settings) => {
-            settings.set_scalar(numer, denom);
+            settings.set_scalar(scalar);
             OK
         }
         None => ERR_NULLPTR,
diff --git a/rust/xaynet-mobile/src/settings.rs b/rust/xaynet-mobile/src/settings.rs
index 0fe99f880..50eab8532 100644
--- a/rust/xaynet-mobile/src/settings.rs
+++ b/rust/xaynet-mobile/src/settings.rs
@@ -4,7 +4,10 @@
 
 use std::convert::TryInto;
 use thiserror::Error;
-use xaynet_core::{crypto::SigningKeyPair, mask::Scalar};
+use xaynet_core::{
+    crypto::SigningKeyPair,
+    mask::{FromPrimitive, Scalar},
+};
 use xaynet_sdk::settings::{MaxMessageSize, PetSettings};
 
 /// A participant settings
@@ -43,8 +46,8 @@ impl Settings {
     }
 
     /// Set the scalar to use for masking
-    pub fn set_scalar(&mut self, numer: u32, denom: u32) {
-        self.scalar = Scalar::new(numer, denom)
+    pub fn set_scalar(&mut self, scalar: f64) {
+        self.scalar = Scalar::from_primitive(scalar).unwrap() // FIXME better to avoid f64
     }
 
     /// Set the Xaynet coordinator address