Add data files and then delete other entries, abnormal data will appear in the zip archive.

```
/*read zip file to buffer */
auto za = ZipArchive::fromWritableBuffer(buffer, buffer_size, ZipArchive::Write);
/* read file1 to buf */
za.addData("path/to/file1", file1_buffer, file2_buffer_size, true);
za.deleteEntry("path/to/file2");
za.close(); 
/* write buffer to zip file */
/* when decompressing with 7z, it prompts "Invalid data besides valid data" */
```