diff --git a/members/libpt-bintols/src/lib.rs b/members/libpt-bintols/src/lib.rs
index ca13f78..54a907f 100644
--- a/members/libpt-bintols/src/lib.rs
+++ b/members/libpt-bintols/src/lib.rs
@@ -25,3 +25,4 @@ pub const YOBI: u128 = 2u128.pow(80);
 // use libpt_core;
 pub mod datalayout;
 pub mod display;
+pub mod split_numbers;
diff --git a/members/libpt-bintols/src/split_numbers.rs b/members/libpt-bintols/src/split_numbers.rs
new file mode 100644
index 0000000..84a29cb
--- /dev/null
+++ b/members/libpt-bintols/src/split_numbers.rs
@@ -0,0 +1,28 @@
+//! # Split numbers into bits and bytes
+//!
+//! Sometimes, you need a large integer in the form of many bytes, so split into [u8].
+//! Rust provides
+
+use num_traits::Unsigned;
+
+/// split an integer into it's bytes, ignoring those bytes that would be all zero.
+///
+/// If the integer is zero, the Vec contains a single null byte.
+pub fn unsigned_to_vec<T>(mut num: T) -> Vec<u8>
+where
+    T: Unsigned,
+    T: std::ops::ShrAssign<i32>,
+    T: std::cmp::PartialOrd<i32>,
+    u8: std::convert::From<T>,
+    T: Copy,
+{
+    if num == 0 {
+        return vec![0];
+    }
+    let mut buf: Vec<u8> = Vec::new();
+    while num > 0 {
+        buf.push(num.into());
+        num >>= 8;
+    }
+    buf
+}