QEMU will always assume EOF when less bytes than requested are returned
by a block drivers 'read' interface, so we need to fill the buffer up to
'size' if possible.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
* Note: The data pointer needs to be valid until the async
* opteration is finished.
*
- * Note: It is not an error for a successful call to transfer fewer
- * bytes than requested.
+ * Note: The call will only ever transfer less than 'size' bytes if
+ * the end of the file has been reached.
*/
void proxmox_restore_read_image_at_async(ProxmoxRestoreHandle *handle,
uint8_t aid,
/// Note: The data pointer needs to be valid until the async
/// opteration is finished.
///
-/// Note: It is not an error for a successful call to transfer fewer
-/// bytes than requested.
+/// Note: The call will only ever transfer less than 'size' bytes if
+/// the end of the file has been reached.
#[no_mangle]
#[allow(clippy::not_unsafe_ptr_arg_deref)]
pub extern "C" fn proxmox_restore_read_image_at_async(
}
let mut reader = reader.lock().await;
- reader.seek(SeekFrom::Start(offset)).await?;
+
let buf: &mut [u8] = unsafe { std::slice::from_raw_parts_mut(data.0 as *mut u8, size as usize)};
- let bytes = reader.read(buf).await?;
+ let mut read = 0;
+
+ while read < size {
+ reader.seek(SeekFrom::Start(offset + read)).await?;
+ let bytes = reader.read(&mut buf[read as usize..]).await?;
+
+ if bytes == 0 {
+ // EOF
+ break;
+ }
+
+ read += bytes as u64;
+ }
- Ok(bytes.try_into()?)
+ Ok(read.try_into()?)
}
}