accessor: add size method

to get the size the accessor was initially created with

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/accessor.rs

@@ -130,6 +130,10 @@ impl<T: ReadAt> AccessorImpl<T> {
         })
     }
 
+    pub fn size(&self) -> u64 {
+        self.size
+    }
+
     pub async fn open_root_ref<'a>(&'a self) -> io::Result<DirectoryImpl<&'a dyn ReadAt>> {
         DirectoryImpl::open_at_end(
             &self.input as &dyn ReadAt,

src/accessor/sync.rs

@@ -94,6 +94,12 @@ impl<T: ReadAt> Accessor<T> {
         self.inner
             .set_goodbye_table_cache(cache.map(|cache| Arc::new(cache) as _))
     }
+
+    /// Get the full archive size we're allowed to access.
+    #[inline]
+    pub fn size(&self) -> u64 {
+        self.inner.size()
+    }
 }
 
 impl<T: Clone + ReadAt> Accessor<T> {