// Create a buffer to write our archive to.
buf := new(bytes.Buffer)

// Create a new siva archive.
w := siva.NewWriter(buf)

// Add some files to the archive.
var files = []struct {
    Name, Body string
}{
    {"readme.txt", "This archive contains some text files."},
    {"gopher.txt", "Gopher names:\nGeorge\nGeoffrey\nGonzo"},
    {"todo.txt", "Get animal handling license."},
}
for _, file := range files {
    hdr := &siva.Header{
        Name:    file.Name,
        Mode:    0600,
        ModTime: time.Now(),
    }
    if err := w.WriteHeader(hdr); err != nil {
        log.Fatalln(err)
    }
    if _, err := w.Write([]byte(file.Body)); err != nil {
        log.Fatalln(err)
    }
}
// Make sure to check the error on Close.
if err := w.Close(); err != nil {
    log.Fatalln(err)
}

// Open the siva archive for reading.
file := bytes.NewReader(buf.Bytes())
r := siva.NewReader(file)

// Get all the files in the siva file.
i, err := r.Index()
if err != nil {
    log.Fatalln(err)
}

// Iterate through the files in the archive.
for _, e := range i {
    content, err := r.Get(e)
    if err != nil {
        log.Fatalln(err)
    }
    fmt.Printf("Contents of %s:\n", e.Name)
    if _, err := io.Copy(os.Stdout, content); err != nil {
        log.Fatalln(err)
    }
    fmt.Println()
}