From 6aad662ec59a3974cbca6c423c1e08e8bc5e90f6 Mon Sep 17 00:00:00 2001
From: A Farzat <a@farzat.xyz>
Date: Tue, 3 Mar 2026 11:10:03 +0300
Subject: Add a function to write mimetype

---
 src/epub.rs | 8 ++++++++
 src/main.rs | 3 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/epub.rs b/src/epub.rs
index 0c0bc74..f216567 100644
--- a/src/epub.rs
+++ b/src/epub.rs
@@ -7,6 +7,14 @@ use tokio::{
     io::AsyncWriteExt,
 };
 
+/// Creates and writes the mimetype. Assumes dest_root already exists.
+pub async fn write_mimetype(dest_root: &Path) -> Result<()> {
+    let dest_path = dest_root.join("mimetype");
+    let mut file = File::create(dest_path).await?;
+    file.write_all(b"application/epub+zip").await?;
+    Ok(())
+}
+
 pub async fn download_all_files(
     client: &Client,
     file_entries: &[FileEntry],
diff --git a/src/main.rs b/src/main.rs
index ed73ec7..6e9e6dd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,7 +5,7 @@ mod models;
 use std::collections::HashMap;
 use std::path::Path;
 
-use crate::epub::download_all_files;
+use crate::epub::{download_all_files, write_mimetype};
 use crate::http_client::build_authenticated_client;
 use crate::models::{Chapter, EpubResponse, FileEntry, Paginated, SpineItem, TocNode};
 use anyhow::{Context, Result, ensure};
@@ -121,6 +121,7 @@ async fn main() -> Result<()> {
     let dest_root = format!("Books/{}/epub_root", args.bookid);
     let dest_root = Path::new(&dest_root);
     download_all_files(&client, &file_entries, dest_root).await?;
+    write_mimetype(dest_root).await?;
 
     // Sanity check: Every entry in spine exists in chapters.
     let chapters: HashMap<String, Chapter> =
-- 
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