PatchSet only serializes patches to the file.

base_patch_generator/src/main.rs

@@ -49,8 +49,7 @@ fn main() -> Result<(), anyhow::Error> {
     patches.add_patches(rom_patches);
 
     println!("Writing output file {}", output_path);
-    let out_file = File::create(&output_path)?;
+    patches.save_to_file(Path::new(&output_path))?;
-    serde_json::to_writer(out_file, &patches)?;
 
     Ok(())
 }

enemize/src/lib.rs

@@ -24,7 +24,6 @@ pub struct Patch {
     pub patch_data: Vec<u8>,
 }
 
-#[derive(Deserialize, Serialize)]
 pub struct PatchSet {
     filename: PathBuf,
     patches: Vec<Patch>,
@@ -43,6 +42,22 @@ impl PatchSet {
         })
     }
 
+    pub fn save(&self) -> anyhow::Result<()> {
+        let file = File::create(&self.filename)?;
+        let buffer = std::io::BufWriter::new(file);
+        serde_json::to_writer(buffer, &self.patches)?;
+
+        Ok(())
+    }
+
+    pub fn save_to_file(&self, filename: &Path) -> anyhow::Result<()> {
+        let file = File::create(filename)?;
+        let buffer = std::io::BufWriter::new(file);
+        serde_json::to_writer(buffer, &self.patches)?;
+
+        Ok(())
+    }
+
     pub fn add_patch(&mut self, patch: Patch) {
         self.patches.push(patch);
     }