gamebridge: use a match here

gamebridge/src/main.rs

@@ -1,22 +1,17 @@
-use log::{debug, info, warn};
+use anyhow::{anyhow, Result};
+use log::{debug, error, info, warn};
 use std::{
     fs::{File, OpenOptions},
     io::{Read, Write},
     str::from_utf8,
 };
 
-fn main() -> anyhow::Result<()> {
+fn main() -> Result<()> {
     pretty_env_logger::try_init()?;
     let mut controller_data = [0; 4];
 
     let mut vblank = File::open("vblank")?;
     let mut input = OpenOptions::new().write(true).open("input")?;
-    let mut demofile = File::open("demo.m64")?;
-
-    {
-        let mut buf = [0; 1024];
-        demofile.read(&mut buf)?;
-    }
 
     info!("ready");
 
@@ -26,11 +21,17 @@ fn main() -> anyhow::Result<()> {
         vblank.read(&mut data)?;
         let str = from_utf8(&data)?;
         debug!("got data: {}", str);
-        if str == "BYE" {
+
+        match str {
+            "OK\n" => input.write(&controller_data)?,
+            "BYE" => {
                 warn!("asked to exit by the game");
                 return Ok(());
+            },
+            _ => {
+                error!("got unknown FIFO data {}", str);
+                return Err(anyhow!("unknown FIFO data received"));
             }
-        demofile.read(&mut controller_data)?;
-        input.write(&controller_data)?;
+        };
     }
 }