Expose choose and b-field build params

Author: Roderick Bovee

src/bfield.rs

@@ -121,6 +121,12 @@ impl<'a, T: Clone + DeserializeOwned + Serialize> BField<T> {
         })
     }
 
+    pub fn build_params(&self) -> (u8, u8, u8, Vec<usize>) {
+        let (_, n_hashes, marker_width, n_marker_bits) = self.members[0].info();
+        let sizes = self.members.iter().map(|i| i.info().0).collect();
+        (n_hashes, marker_width, n_marker_bits, sizes)
+    }
+
     pub fn params(&self) -> &Option<T> {
         &self.members[0].params.other
     }

src/lib.rs

@@ -8,5 +8,6 @@ mod bfield;
 mod bfield_member;
 mod marker;
 
+pub use crate::marker::choose;
 pub use crate::bfield::BField;
 pub use crate::bfield_member::BFieldVal;

src/marker.rs

@@ -101,7 +101,7 @@ fn test_to_and_from_marker() {
 /// This may overflow for k > 9 (with n = 128), but hopefully
 /// that doesn't happen
 #[inline]
-fn choose(n: u64, k: u8) -> u64 {
+pub fn choose(n: u64, k: u8) -> u64 {
     match k {
         1 => n,
         2 => n * (n - 1) / 2,