From 9a95cf1684fcd8bfc81efcac7676532413d35328 Mon Sep 17 00:00:00 2001
From: A Farzat <a@farzat.xyz>
Date: Tue, 3 Mar 2026 13:11:57 +0300
Subject: Start with the create_epub_archive function

For now, only mimetype is added. Next step is adding all the other files
in epub_root.
---
 Cargo.lock  | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  1 +
 src/epub.rs | 16 ++++++++++++-
 3 files changed, 96 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 216b302..fca495c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "adler2"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
+
 [[package]]
 name = "anstream"
 version = "0.6.21"
@@ -260,6 +266,15 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "crc32fast"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "deranged"
 version = "0.5.8"
@@ -326,6 +341,16 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 
+[[package]]
+name = "flate2"
+version = "1.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843fba2746e448b37e26a819579957415c8cef339bf08564fe8b7ddbd959573c"
+dependencies = [
+ "miniz_oxide",
+ "zlib-rs",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -779,6 +804,16 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
 
+[[package]]
+name = "miniz_oxide"
+version = "0.8.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fa76a2c86f704bdb222d66965fb3d63269ce38518b83cb0575fca855ebb6316"
+dependencies = [
+ "adler2",
+ "simd-adler32",
+]
+
 [[package]]
 name = "mio"
 version = "1.1.1"
@@ -824,6 +859,7 @@ dependencies = [
  "serde",
  "serde_json",
  "tokio",
+ "zip",
 ]
 
 [[package]]
@@ -1274,6 +1310,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "simd-adler32"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e320a6c5ad31d271ad523dcf3ad13e2767ad8b1cb8f047f75a8aeaf8da139da2"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -1583,6 +1625,12 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
+[[package]]
+name = "typed-path"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e28f89b80c87b8fb0cf04ab448d5dd0dd0ade2f8891bae878de66a75a28600e"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.24"
@@ -2128,8 +2176,40 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "zip"
+version = "8.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e499faf5c6b97a0d086f4a8733de6d47aee2252b8127962439d8d4311a73f72"
+dependencies = [
+ "crc32fast",
+ "flate2",
+ "indexmap",
+ "memchr",
+ "typed-path",
+ "zopfli",
+]
+
+[[package]]
+name = "zlib-rs"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3be3d40e40a133f9c916ee3f9f4fa2d9d63435b5fbe1bfc6d9dae0aa0ada1513"
+
 [[package]]
 name = "zmij"
 version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
+
+[[package]]
+name = "zopfli"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f05cd8797d63865425ff89b5c4a48804f35ba0ce8d125800027ad6017d2b5249"
+dependencies = [
+ "bumpalo",
+ "crc32fast",
+ "log",
+ "simd-adler32",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 46034d8..9966c5a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,4 @@ reqwest = { version = "0.13.2", features = ["cookies", "json"] }
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.149"
 tokio = { version = "1.49.0", features = ["full"] }
+zip = { version = "8.1.0", default-features = false, features = ["deflate"] }
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(())
+}
-- 
cgit v1.2.3-70-g09d2