README

rmp_fs

A small lib that help to serialize and deserialize from/to rmp (RustMessagePack) with a file. It does nothing special, just encapsulates rmp_serde into functions that can be used repeatedly.

Example:

```rust

[macro_use]

extern crate serde_derive;

use rmpfs::{savetormp, loadfrom_rmp}; use std::path::Path;

// Define a struct of data

[derive(Debug, PartialEq, Deserialize, Serialize)]

struct ExampleData { value: i64, message: String, }

fn main() { let filename = Path::new("testrmp_fs.blob");

let data = ExampleData {
    value: -123456,
    message: "Example rmp_fs".to_string()
};

// Save to a file it return Result<(), Box<dyn Error>>
save_to_rmp(file_name, &data).expect("Fail to save as rmp.");

// Load from a file it return Result<T, Box<dyn Error>>
let data2: ExampleData =load_from_rmp(file_name).expect("Fail to load from rmp.");
println!("{:?}\n{:?}",data,data2);

} ```

Note:

According my test the struct below has a size of 248 bytes using rmp and 389 bytes using cbor

```rust

[derive(Debug, PartialEq, Deserialize, Serialize)]

struct StructTest01 {
    text : String,
    value1 : u16,
    value2 : i32,
    value3 : u8,
    value4 : i16,
    value5 : u32,
    value6 : u64,
    value7 : i64,
    value8 : usize,
    value9 : f32,
    value10 : f64,
    array : Vec<u8>,
    tuple : (DateTime<Utc>,u64),
    complex : StructTest02,
}

#[derive(Debug, PartialEq, Deserialize, Serialize)]
struct StructTest02 {
    data_v : Vec<i16>,
    data_m : HashMap<String,String>,
    state : bool,
}

```