> For the complete documentation index, see [llms.txt](https://xiv.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xiv.dev/game-internals/rsf.md).

# RSF

RSF is very similar to [RSV](/game-internals/rsv.md) except it works on file level.

### Pseudocode

The procedure to generate a RSF file is as follows:

```python
def create_rsf(plaintext):
    deflated_bytes = zlib.compress(plaintext, level=9)
    
    # Server stores this part and will send it to the client when zoning-in
    header = deflated_bytes[:64]
    
    # Client stores this part
    body = deflated_bytes[64:]
```