diff --git a/src/file_info.rs b/src/file_info.rs
index 35ad601..9b6e396 100644
--- a/src/file_info.rs
+++ b/src/file_info.rs
@@ -36,7 +36,10 @@ pub async fn find_by_id(
     .await
 }
 
-pub async fn create(file_info: &FileInfo, db: &sqlx::Pool<sqlx::Postgres>) -> Result<(), sqlx::Error> {
+pub async fn create(
+    file_info: &FileInfo,
+    db: &sqlx::Pool<sqlx::Postgres>,
+) -> Result<(), sqlx::Error> {
     sqlx::query(
         "INSERT INTO Files (file_id, file_name, content_type, valid_till, delete_on_download) \
         VALUES ($1, $2, $3, $4, $5)",
diff --git a/src/main.rs b/src/main.rs
index c5589da..28ba4cb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,6 +13,7 @@ mod upload;
 use crate::rate_limit::ForwardedPeerIpKeyExtractor;
 use actix_files::Files;
 use actix_governor::{Governor, GovernorConfigBuilder};
+use actix_web::middleware::from_fn;
 use actix_web::{
     http::header::{
         HeaderName, CROSS_ORIGIN_OPENER_POLICY, PERMISSIONS_POLICY, REFERRER_POLICY,
@@ -22,7 +23,6 @@ use actix_web::{
     web::{self, Data},
     App, Error, HttpResponse, HttpServer,
 };
-use actix_web::middleware::from_fn;
 use env_logger::Env;
 use sqlx::postgres::PgPool;
 use std::env;
diff --git a/src/mime_relations.rs b/src/mime_relations.rs
index a20d482..1f8133f 100644
--- a/src/mime_relations.rs
+++ b/src/mime_relations.rs
@@ -8,7 +8,7 @@ use mime::Mime;
 
 lazy_static! {
     static ref ALIASES: HashMap<Mime, Mime> = load_mime_aliases();
-    static ref PARENTS: Vec<(Mime, Mime)> = load_mime_parent_relations();
+    static ref PARENTS: HashMap<Mime, Vec<Mime>> = load_mime_parent_relations();
     static ref EXTENSIONS: HashMap<Mime, &'static str> = load_mime_extensions();
 }
 
@@ -20,14 +20,18 @@ fn load_mime_aliases() -> HashMap<Mime, Mime> {
         .collect()
 }
 
-fn load_mime_parent_relations() -> Vec<(Mime, Mime)> {
-    tree_magic_db::subclasses()
+fn load_mime_parent_relations() -> HashMap<Mime, Vec<Mime>> {
+    let mut parents = HashMap::<Mime, Vec<Mime>>::new();
+    let subclasses = tree_magic_db::subclasses()
         .lines()
         .filter_map(|line| line.split_once(' '))
         .filter_map(|(child, parent)| {
             Some((Mime::from_str(child).ok()?, Mime::from_str(parent).ok()?))
-        })
-        .collect()
+        });
+    for (child, parent) in subclasses {
+        parents.entry(child).or_default().push(parent);
+    }
+    parents
 }
 
 fn load_mime_extensions() -> HashMap<Mime, &'static str> {
@@ -40,25 +44,22 @@ fn load_mime_extensions() -> HashMap<Mime, &'static str> {
         .collect()
 }
 
-pub(crate) fn get_alias(mimetype: Mime) -> Mime {
+pub fn resolve_alias(mimetype: Mime) -> Mime {
     ALIASES.get(&mimetype).cloned().unwrap_or(mimetype)
 }
 
-fn get_mime_parents(mimetype: &Mime) -> Vec<&Mime> {
-    PARENTS
-        .iter()
-        .filter_map(|(child, parent)| (child == mimetype).then_some(parent))
-        .collect()
+fn get_mime_parents(mimetype: &Mime) -> &[Mime] {
+    PARENTS.get(mimetype).map(Vec::as_slice).unwrap_or(&[])
 }
 
-pub(crate) fn matches_text(mime: &Mime) -> bool {
+pub fn matches_text(mime: &Mime) -> bool {
     if mime.type_() == mime::TEXT {
         return true;
     }
-    return get_mime_parents(mime).into_iter().any(matches_text);
+    get_mime_parents(mime).iter().any(matches_text)
 }
 
-pub(crate) fn get_extension(mimetype: &Mime) -> Option<&'static str> {
+pub fn get_extension(mimetype: &Mime) -> Option<&'static str> {
     let mut queue = VecDeque::new();
     queue.push_back(mimetype);
     while let Some(mime) = queue.pop_front() {
diff --git a/src/multipart.rs b/src/multipart.rs
index 1a19f89..8b14c5e 100644
--- a/src/multipart.rs
+++ b/src/multipart.rs
@@ -73,7 +73,7 @@ pub(crate) async fn parse_multipart_inner(
                 (size, first_bytes) = create_file(file_path, field, config.max_file_size).await?;
                 content_type = Some(
                     mime.filter(|mime| *mime != APPLICATION_OCTET_STREAM)
-                        .map(mime_relations::get_alias)
+                        .map(mime_relations::resolve_alias)
                         .or_else(|| get_content_type(&first_bytes))
                         .unwrap_or(APPLICATION_OCTET_STREAM),
                 );
diff --git a/src/script_nonce.rs b/src/script_nonce.rs
index 806fa72..9bd81d0 100644
--- a/src/script_nonce.rs
+++ b/src/script_nonce.rs
@@ -1,10 +1,10 @@
+use actix_web::middleware::Next;
 use actix_web::{
     body::MessageBody,
     dev::{ServiceRequest, ServiceResponse},
     http::header::{HeaderValue, CONTENT_SECURITY_POLICY},
     Error, HttpMessage,
 };
-use actix_web::middleware::Next;
 use rand::Rng;
 use std::fmt::Display;
 
diff --git a/src/template.rs b/src/template.rs
index 558ac27..be39c51 100644
--- a/src/template.rs
+++ b/src/template.rs
@@ -133,7 +133,9 @@ pub fn insert_abuse_template(html: String, req: Option<&HttpRequest>, config: &C
 
 pub fn insert_script_nonce(req: &HttpRequest, html: String) -> String {
     let extensions = &req.extensions();
-    let script_nonce = extensions.get::<ScriptNonce>().expect("script_nonce available");
+    let script_nonce = extensions
+        .get::<ScriptNonce>()
+        .expect("script_nonce available");
     html.replace("{script_nonce}", &script_nonce.to_string())
 }
 
diff --git a/src/upload.rs b/src/upload.rs
index d5f2447..ae30f71 100644
--- a/src/upload.rs
+++ b/src/upload.rs
@@ -21,7 +21,7 @@ pub async fn index(req: HttpRequest, config: web::Data<Config>) -> HttpResponse
     let index_html = template::build_index_html(&req, &config);
     HttpResponse::Ok()
         .content_type("text/html")
-        .body(index_html) 
+        .body(index_html)
 }
 
 pub async fn upload(