Fix #5165

bindings/c/src/types.rs

@@ -31,28 +31,32 @@ use opendal::Buffer;
 #[repr(C)]
 pub struct opendal_bytes {
     /// Pointing to the byte array on heap
-    pub data: *const u8,
+    pub data: *mut u8,
     /// The length of the byte array
     pub len: usize,
+    /// The capacity of the byte array
+    pub capacity: usize,
 }
 
 impl opendal_bytes {
     /// Construct a [`opendal_bytes`] from the Rust [`Vec`] of bytes
     pub(crate) fn new(buf: Buffer) -> Self {
-        let vec = buf.to_vec();
-        let data = vec.as_ptr();
-        let len = vec.len();
-        std::mem::forget(vec);
-        Self { data, len }
+        let buf = std::mem::ManuallyDrop::new(vec);
+        let data = buf.as_mut_ptr();
+        let len = buf.len();
+        let capa = buf.capacity();
+        Self {
+            data,
+            len,
+            capacity,
+        }
     }
 
     /// \brief Frees the heap memory used by the opendal_bytes
     #[no_mangle]
     pub unsafe extern "C" fn opendal_bytes_free(ptr: *mut opendal_bytes) {
         if !ptr.is_null() {
-            let data_mut = (*ptr).data as *mut u8;
-            drop(Vec::from_raw_parts(data_mut, (*ptr).len, (*ptr).len));
-            drop(Box::from_raw(ptr));
+            let _ = Vec::from_raw_parts((*ptr).data, (*ptr).len, (*ptr).capacity);
         }
     }
 }