#derive #macros #pread #pwrite #bytes

macro scroll_derive

A macros 1.1 derive implementation for Pread and Pwrite traits from the scroll crate

19 unstable releases

0.11.0 Jan 2, 2022
0.10.5 Jan 25, 2021
0.10.4 Oct 23, 2020
0.10.2 May 9, 2020
0.3.0 Mar 15, 2017

#249 in Procedural macros

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Used in 62 crates (8 directly)

MIT license

21KB
507 lines

scroll_derive

Macros 1.1 implementing #[derive(Pread, Pwrite)] for https://github.com/m4b/scroll

Add derive annotations to your POD seamlessly and easily:

extern crate scroll;
#[macro_use]
extern crate scroll_derive;

#[derive(Debug, PartialEq, Pread, Pwrite, IOread, IOwrite, SizeWith)]
#[repr(C)]
struct Data {
    id: u32,
    timestamp: f64,
    arr: [u16; 2],
}

use scroll::{Pread, Pwrite, Cread, LE};

fn main (){
    let bytes = [0xefu8, 0xbe, 0xad, 0xde, 0, 0, 0, 0, 0, 0, 224, 63, 0xad, 0xde, 0xef, 0xbe];
    let data: Data = bytes.pread_with(0, LE).unwrap();
    println!("data: {:?}", &data);
    assert_eq!(data.id, 0xdeadbeefu32);
    let mut bytes2 = vec![0; ::std::mem::size_of::<Data>()];
    bytes2.pwrite_with(data, 0, LE).unwrap();
    let data: Data = bytes.pread_with(0, LE).unwrap();
    let data2: Data = bytes2.pread_with(0, LE).unwrap();
    assert_eq!(data, data2);

    let data: Data = bytes.cread_with(0, LE);
    assert_eq!(data, data2);
}

Dependencies

~0.6–1MB
~26K SLoC