diff --git a/src/byteorder.rs b/src/byteorder.rs
new file mode 100644
index 0000000..e909f93
--- /dev/null
+++ b/src/byteorder.rs
@@ -0,0 +1,76 @@
+use core::convert::TryInto;
+
+pub trait ByteOrder {
+    fn read_u16(buf: &[u8]) -> u16;
+    fn read_u32(buf: &[u8]) -> u32;
+    fn read_u64(buf: &[u8]) -> u64;
+    fn read_uint(buf: &[u8], nbytes: usize) -> u64;
+    fn write_u16(buf: &mut [u8], n: u16);
+    fn write_u32(buf: &mut [u8], n: u32);
+    fn write_u64(buf: &mut [u8], n: u64);
+    fn write_uint(buf: &mut [u8], n: u64, nbytes: usize);
+}
+
+pub enum BigEndian {}
+pub enum LittleEndian {}
+pub enum NativeEndian {}
+
+macro_rules! impl_endian {
+    ($t:ty, $from_endian:ident, $to_endian:ident) => {
+        impl ByteOrder for $t {
+            #[inline]
+            fn read_u16(buf: &[u8]) -> u16 {
+                u16::$from_endian(buf[0..2].try_into().unwrap())
+            }
+
+            #[inline]
+            fn read_u32(buf: &[u8]) -> u32 {
+                u32::$from_endian(buf[0..4].try_into().unwrap())
+            }
+
+            #[inline]
+            fn read_u64(buf: &[u8]) -> u64 {
+                u64::$from_endian(buf[0..8].try_into().unwrap())
+            }
+
+            #[inline]
+            fn read_uint(buf: &[u8], nbytes: usize) -> u64 {
+                let mut dst = [0u8; 8];
+                dst[..nbytes].copy_from_slice(&buf[..nbytes]);
+                u64::$from_endian(dst)
+            }
+
+            #[inline]
+            fn write_u16(buf: &mut [u8], n: u16) {
+                buf[0..2].copy_from_slice(&n.$to_endian()[..]);
+            }
+
+            #[inline]
+            fn write_u32(buf: &mut [u8], n: u32) {
+                buf[0..4].copy_from_slice(&n.$to_endian()[..]);
+            }
+
+            #[inline]
+            fn write_u64(buf: &mut [u8], n: u64) {
+                buf[0..8].copy_from_slice(&n.$to_endian()[..]);
+            }
+
+            #[inline]
+            fn write_uint(buf: &mut [u8], n: u64, nbytes: usize) {
+                buf[..nbytes].copy_from_slice(&n.$to_endian()[..nbytes]);
+            }
+        }
+    };
+}
+
+impl_endian! {
+    BigEndian, from_be_bytes, to_be_bytes
+}
+
+impl_endian! {
+    LittleEndian, from_le_bytes, to_le_bytes
+}
+
+impl_endian! {
+    NativeEndian, from_ne_bytes, to_ne_bytes
+}
diff --git a/src/determinize.rs b/src/determinize.rs
index f300316..cf0c285 100644
--- a/src/determinize.rs
+++ b/src/determinize.rs
@@ -148,7 +148,8 @@
         if let Some(&cached_id) = self.cache.get(&state) {
             // Since we have a cached state, put the constructed state's
             // memory back into our scratch space, so that it can be reused.
-            mem::replace(&mut self.scratch_nfa_states, state.nfa_states);
+            let _ =
+                mem::replace(&mut self.scratch_nfa_states, state.nfa_states);
             return Ok((cached_id, false));
         }
         // Nothing was in the cache, so add this state to the cache.
diff --git a/src/lib.rs b/src/lib.rs
index 4d3e9c1..7894ecc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -290,7 +290,6 @@
 
 #[cfg(all(test, feature = "transducer"))]
 extern crate bstr;
-extern crate byteorder;
 #[cfg(feature = "transducer")]
 extern crate fst;
 #[cfg(feature = "std")]
@@ -306,6 +305,7 @@
 pub use sparse::SparseDFA;
 pub use state_id::StateID;
 
+mod byteorder;
 mod classes;
 #[path = "dense.rs"]
 mod dense_imp;
diff --git a/src/sparse_set.rs b/src/sparse_set.rs
index 6f145ba..56743b0 100644
--- a/src/sparse_set.rs
+++ b/src/sparse_set.rs
@@ -6,7 +6,7 @@
 /// entire set can also be done in constant time. Iteration yields elements
 /// in the order in which they were inserted.
 ///
-/// The data structure is based on: http://research.swtch.com/sparse
+/// The data structure is based on: https://research.swtch.com/sparse
 /// Note though that we don't actually use uninitialized memory. We generally
 /// reuse sparse sets, so the initial allocation cost is bareable. However, its
 /// other properties listed above are extremely useful.