bencode

A bencode parser.

Example

```rust use bencodex::BNode;

fn main() { unmarshal(); println!("-----------------"); marshal(); }

fn unmarshal() { let b = "d3:inti233e3:lstl7:bencodeee"; let result = bencodex::parse(&b);

match result {
    Ok(node) => {
        let map = node.as_map().unwrap();
        let int = map.get("int").unwrap().as_int().unwrap();
        println!("Int = {}", int);
        let lst = map.get("lst").unwrap().as_list().unwrap();
        println!("There're {} values in the list", lst.len());
        println!(
            "The first value in the list is `{}`",
            &lst[0].as_str().unwrap()
        );
    }
    Err(e) => panic!(e),
}

}

fn marshal() { let mut map = std::collections::BTreeMap::new(); map.insert("int".tostring(), BNode::Int(2333)); map.insert( "lst".tostring(), BNode::List(vec![BNode::Str("bencode".to_string())]), );

println!("{}", &BNode::Map(map));

} ```

Output ``` Int = 233 There're 1 values in the list

The first value in the list is bencode

d3:inti2333e3:lstl7:bencodeee ```