Start with the create_epub_archive function

For now, only mimetype is added. Next step is adding all the other files
in epub_root.

1 files changed, 15 insertions, 1 deletions

diff --git a/src/epub.rs b/src/epub.rs
index d86fa35..e71e3ca 100644
--- a/src/epub.rs
+++ b/src/epub.rs
@@ -1,11 +1,12 @@
 use crate::models::FileEntry;
 use anyhow::Result;
 use reqwest::Client;
-use std::path::Path;
+use std::{io::Write, path::Path};
 use tokio::{
     fs::{self, File},
     io::AsyncWriteExt,
 };
+use zip::{CompressionMethod, ZipWriter, write::FileOptions};
 
 /// Creates and writes container.xml.
 pub async fn write_container_xml(dest_root: &Path, opf_full_path: &str) -> Result<()> {
@@ -58,3 +59,16 @@ pub async fn download_all_files(
     }
     Ok(())
 }
+
+/// Creates the EPUB archive (creates zip and includes all files in it).
+pub fn create_epub_archive(epub_root: &Path, output_epub: &Path) -> Result<()> {
+    let out_file = std::fs::File::create(output_epub)?;
+    let mut zip = ZipWriter::new(out_file);
+
+    let mimetype_options: FileOptions<()> =
+        FileOptions::default().compression_method(CompressionMethod::Stored);
+    zip.start_file("mimetype", mimetype_options)?;
+    zip.write_all(b"application/epub+zip")?;
+
+    Ok(())
+}