fix performance bottleneck with io::Read impl for tinybytes

DataDog · Sep 17, 2024 · 86d2c0c · 86d2c0c
1 parent d08ed8a
commit 86d2c0c
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/tinybytes/src/lib.rs b/tinybytes/src/lib.rs
@@ -27,7 +27,11 @@ unsafe impl Sync for Bytes {}
 impl io::Read for Bytes {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         let bytes_read = cmp::min(buf.len(), self.len());
-        buf[..bytes_read].copy_from_slice(&self[..bytes_read]);
+
+        unsafe {
+            std::ptr::copy_nonoverlapping(self.as_ptr(), buf.as_mut_ptr(), bytes_read);
+        }
+
         self.advance(bytes_read);
         Ok(bytes_read)
     }