Archflow

A library for creating ZIP archives in one pass. This is useful when when it is not possible to seek in the output such as stdout or a data stream.

ZIP is an archive file format that supports lossless data compression. A ZIP file may contain one or more files or directories that may have been compressed. The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common. This format was originally created in 1989 and was first implemented in PKWARE, Inc.'s PKZIP utility

The current implementation is based on

PKWARE’s APPNOTE.TXT v6.3.10

Features

• Stream on the fly an archive in one pass (i.e. no seek).
• tokio AsyncRead / AsyncWrite and AsyncSeek compatible.
• std::io Read / Write and Seek compatible
• File type detection (text or binary)
• Zip64 format (archive size over 4Gb)
• Unix time

Support the following compression formats:

• stored (i.e. none)
• deflate
• bzip2
• zstd
• xz

Cargo features

When included in you project, you have the choice to choose the tokio (asynchronous) or standard version.

Feature	Description
tokio	To use tokio non blocking API, namely: [tokio::io::AsyncRead], [tokio::io::AsyncWrite] and [tokio::io::AsyncSeek]
std	To use standard API, namely: [std::io::Read], [std::io::Write] and [std::io::Seek]

Examples

File system

A simple example to create an archive file using [tokio::fs::File]

 use archflow::{
 compress::FileOptions, compress::tokio::archive::ZipArchive, compression::CompressionMethod,
 error::ArchiveError,
 };

 use tokio::fs::File;

 #[tokio::main]
 async fn main() -> Result<(), ArchiveError> {
 let file = File::create("archive.zip").await?;

 let options = FileOptions::default().compression_method(CompressionMethod::Deflate());

 let mut archive = ZipArchive::new_streamable(file);
 archive.append("file1.txt", &options, &mut b"hello\n".as_ref()).await?;

 let options = options.compression_method(CompressionMethod::Store());
 archive.append("file2.txt", &options, &mut b"world\n".as_ref()).await?;

 archive.finalize().await?;

 Ok(())
 }

Actix

Stream a zip archive as a actix response:

 use std::path::Path;

 use actix_web::http::header::ContentDisposition;
 use actix_web::{get, App, HttpResponse, HttpServer};
 use archflow::compress::tokio::archive::ZipArchive;
 use archflow::compress::FileOptions;
 use archflow::compression::CompressionMethod;
 use archflow::types::FileDateTime;
 use tokio::fs::File;
 use tokio::io::duplex;

 use tokio_util::io::ReaderStream;

 #[get("/zip")]
 async fn zip_archive() -> HttpResponse {
     let (w, r) = duplex(4096);
     let options = FileOptions::default()
         .last_modified_time(FileDateTime::Now)
         .compression_method(CompressionMethod::Deflate());

     tokio::spawn(async move {
         let mut archive = ZipArchive::new_streamable(w);

         let file_path = Path::new("./tests/resources/lorem_ipsum.txt");

         let mut file = File::open(file_path).await.unwrap();
         archive
             .append("ipsum_deflate.txt", &options, &mut file)
             .await
             .unwrap();

         archive
             .append("file1.txt", &options, &mut b"world\n".as_ref())
             .await
             .unwrap();

         archive
             .append("file2.txt", &options, &mut b"world\n".as_ref())
             .await
             .unwrap();

         let mut f = File::open(file_path).await.unwrap();
         let options = options.compression_method(CompressionMethod::BZip2());
         archive
             .append("ipsum_bz.txt", &options, &mut f)
             .await
             .unwrap();

         let mut f = File::open(file_path).await.unwrap();
         let options = options.compression_method(CompressionMethod::Xz());
         archive
             .append("ipsum_xz.txt", &options, &mut f)
             .await
             .unwrap();

         archive.finalize().await.unwrap();
     });

     HttpResponse::Ok()
         .insert_header(("Content-Type", "application/zip"))
         .insert_header(ContentDisposition::attachment("myzip.zip"))
         .streaming(ReaderStream::new(r))
 }

 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
     let address = "127.0.0.1";
     let port = 8081;

     println!("Test url is http://{}:{}/zip", address, port);

     HttpServer::new(|| App::new().service(zip_archive))
         .bind((address, port))?
         .run()
         .await
 }

Hyper

Stream a zip archive as a hyper response:

 use archflow::{
 compress::tokio::archive::ZipArchive, compress::FileOptions, compression::CompressionMethod,
 types::FileDateTime,
 };
 use hyper::service::{make_service_fn, service_fn};
 use hyper::{header, Body, Request, Response, Server, StatusCode};
 use tokio::io::duplex;
 use tokio_util::io::ReaderStream;

 async fn zip_archive(_req: Request<Body>) -> Result<Response<Body>, hyper::http::Error> {
     let (w, r) = duplex(4096);
     let options = FileOptions::default()
         .compression_method(CompressionMethod::Deflate())
         .last_modified_time(FileDateTime::Now);
     tokio::spawn(async move {
         let mut archive = ZipArchive::new_streamable(w);
         archive
             .append("file1.txt", &options, &mut b"world\n".as_ref())
             .await
             .unwrap();
         archive
             .append("file2.txt", &options, &mut b"world\n".as_ref())
             .await
             .unwrap();
         archive.finalize().await.unwrap();
     });

     Response::builder()
         .status(StatusCode::OK)
         .header(header::CONTENT_TYPE, "application/zip")
         .body(Body::wrap_stream(ReaderStream::new(r)))
 }

 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
     let address = ([127, 0, 0, 1], 8081).into();
     let service =
         make_service_fn(|_| async { Ok::<_, hyper::http::Error>(service_fn(zip_archive)) });
     let server = Server::bind(&address).serve(service);

     println!("Listening on http://{}", address);
     server.await?;

     Ok(())
 }

Disclaimer

The library is in construction and not stable. More tests need to be done.

This implementation is inspired by :

• https://github.com/scotow/zipit and
• https://github.com/zip-rs/zip

Hyper