chore: Use naming scheme without rosenpass- for crates

util/src/mem.rs

@@ -0,0 +1,33 @@
+use std::borrow::{Borrow, BorrowMut};
+use std::cmp::min;
+
+/// Concatenate two byte arrays
+// TODO: Zeroize result?
+#[macro_export]
+macro_rules! cat {
+    ($len:expr; $($toks:expr),+) => {{
+        let mut buf = [0u8; $len];
+        let mut off = 0;
+        $({
+            let tok = $toks;
+            let tr = ::std::borrow::Borrow::<[u8]>::borrow(tok);
+            (&mut buf[off..(off + tr.len())]).copy_from_slice(tr);
+            off += tr.len();
+        })+
+        assert!(off == buf.len(), "Size mismatch in cat!()");
+        buf
+    }}
+}
+
+// TODO: consistent inout ordering
+pub fn cpy<T: BorrowMut<[u8]> + ?Sized, F: Borrow<[u8]> + ?Sized>(src: &F, dst: &mut T) {
+    dst.borrow_mut().copy_from_slice(src.borrow());
+}
+
+/// Copy from `src` to `dst`. If `src` and `dst` are not of equal length, copy as many bytes as possible.
+pub fn cpy_min<T: BorrowMut<[u8]> + ?Sized, F: Borrow<[u8]> + ?Sized>(src: &F, dst: &mut T) {
+    let src = src.borrow();
+    let dst = dst.borrow_mut();
+    let len = min(src.len(), dst.len());
+    dst[..len].copy_from_slice(&src[..len]);
+}