Crate nimble_derive

Nimble

Async friendly, simple and fast binary encoding/decoding in Rust.

Binary encoding scheme

This crate uses a minimal binary encoding scheme. For example, consider the following struct:

struct MyStruct {
    a: u8,
    b: u16,
}

encode() will serialize this into Vec of size 3 (which is the sum of sizes of u8 and u16).

Similarly, for types which can have dynamic size (Vec, String, etc.), encode() prepends the size of encoded value as u64.

Usage

Add nimble in your Cargo.toml’s dependencies section:

[dependencies]
nimble = { version = "0.2", features = ["derive"] }

Or, if you are in an environment based on tokio, use:

[dependencies]
nimble = { version = "0.2", features = ["derive", "tokio"] }

For encoding and decoding, any type must implement two traits provided by this crate, i.e., Encode and Decode. For convenience, nimble provides derive macros (only when "derive" feature is enabled) to implement these traits.

use nimble::{Encode, Decode};

#[derive(Encode, Decode)]
struct MyStruct {
    a: u8,
    b: u16,
}

Now you can use encode() and decode() functions to encode and decode values of MyStruct. In addition to this, you can also use MyStruct::encode_to() function to encode values directly to a type implementing AsyncWrite and MyStruct::decode_from() function to decode values directly from a type implementing AsyncRead.

Note: Most of the functions exposed by this crate are async functions and returns Future values. So, you’ll need an executor to drive the Future returned from these functions. async-std and tokio are two popular options.

Features

• tokio: Select this feature when you are using tokio’s executor to drive Future values returned by functions in this crate. This implements Encode and Decode using tokio’s AsyncRead/AsyncWrite traits.
  • Disabled by default.
• derive: Enables derive macros for implementing Encode and Decode traits.
  • Disabled by default.

Derive Macros

Decode

Derive macro to implement Decode trait

Encode

Derive macro to implement Encode trait