Use format strings to create strongly-typed data pack/unpack interfaces (inspired by Python's struct library).
Add this to your Cargo.toml:
toml
[dependencies]
structure = "0.1"
And this to your crate root:
```rust
extern crate structure; ```
rust
// Two `u32` and one `u8`
let s = structure!("2IB");
let buf: Vec<u8> = s.pack(1, 2, 3)?;
assert_eq!(buf, vec![0, 0, 0, 1, 0, 0, 0, 2, 3]);
assert_eq!(s.unpack(buf)?, (1, 2, 3));
It's useful to use pack_into and unpack_from when using types that implement Write or Read.
The following example shows how to send a u32 and a u8 through sockets:
rust
use std::net::{TcpListener, TcpStream};
let listener = TcpListener::bind("127.0.0.1:0")?;
let mut client = TcpStream::connect(listener.local_addr()?)?;
let (mut server, _) = listener.accept()?;
let s = structure!("IB");
s.pack_into(&mut client, 1u32, 2u8)?;
let (n, n2) = s.unpack_from(&mut server)?;
assert_eq!((n, n2), (1u32, 2u8));
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