1 files changed, 19 insertions, 0 deletions
diff --git a/src/convert.rs b/src/convert.rs
new file mode 100644
index 0000000..afc5faf
--- /dev/null
+++ b/src/convert.rs
@@ -0,0 +1,19 @@
+pub(crate) fn usize_to_u32(u: usize) -> Option<u32> {
+    #[cfg(not(no_try_from))]
+    {
+        use core::convert::TryFrom;
+
+        u32::try_from(u).ok()
+    }
+
+    #[cfg(no_try_from)]
+    {
+        use core::mem;
+
+        if mem::size_of::<usize>() <= mem::size_of::<u32>() || u <= u32::max_value() as usize {
+            Some(u as u32)
+        } else {
+            None
+        }
+    }
+}