code: def _inject(self, fileobj, padding_func):
          
  
          # Ogg FLAC has no convenient data marker like Vorbis, but the
          # second packet - and second page - must be the comment data.
          fileobj.seek(0)
          page = OggPage(fileobj)
          while not page.packets[0].startswith(b"\x7FFLAC"):
              page = OggPage(fileobj)
  
          first_page = page
          while not (page.sequence == 1 and page.serial == first_page.serial):
              page = OggPage(fileobj)
  
          old_pages = [page]
          while not (old_pages[-1].complete or len(old_pages[-1].packets) > 1):
              page = OggPage(fileobj)
              if page.serial == first_page.serial:
                  old_pages.append(page)
  
          packets = OggPage.to_packets(old_pages, strict=False)
  
          # Set the new comment block.
          data = self.write(framing=False)
          data = packets[0][:1] + struct.pack(">I", len(data))[-3:] + data
          packets[0] = data
  
          new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
          OggPage.replace(fileobj, old_pages, new_pages)
docs: Write tag data into the FLAC Vorbis comment packet/page.