can't parse file from END to beginning known it's size
```
meta:
  id: dvpl
  file-extension: dvpl
  endian: le
seq:
  - id: compressed_data
    size: stream_size - sizeof(dvpl_footer_t) # HOW TO do it?
  - id: dvpl_footer
    type: dvpl_footer_t
types:
  dvpl_footer_t:
    seq:
      - id: size_uncompressed
        type: u4
      - id: size_compressed
        type: u4
      - id: crc32_compressed
        type: u4
      - id: compressor_type
        type: u4
      - id: pack_marker_lite
        contents: "DVPL"
```

I have struct with data in beginning of file and known footer at the end of file, so first I parse end footer struct and than goto begin and load data, I read all documentation but can't find how to do it?