binrw 0.15.1

A Rust crate for helping read structs from binary data using ✨macro magic✨
Documentation 
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use binrw::{io::Cursor, BinWrite};

#[derive(BinWrite)]
struct TestEndian {
    x: u16,

    #[bw(little)]
    y: u16,

    #[bw(is_big = true)]
    z: u32,

    #[bw(is_big = false)]
    not_z: u32,
}

#[test]
fn write_endian() {
    let mut x = Cursor::new(Vec::new());

    TestEndian {
        x: 1,
        y: 2,
        z: 3,
        not_z: 3,
    }
    .write_be(&mut x)
    .unwrap();

    assert_eq!(x.into_inner(), [0, 1, 2, 0, 0, 0, 0, 3, 3, 0, 0, 0]);
}

#[test]
fn top_level_endian() {
    #[derive(BinWrite)]
    #[bw(is_big = true)]
    struct Test {
        #[bw(big)] // <-- will be ignored
        little: TestLittle,

        big: TestInheritBig,
    }

    #[derive(BinWrite)]
    #[bw(little)]
    struct TestLittle {
        x: u16,
        y: u32,
    }

    #[derive(BinWrite)]
    struct TestInheritBig {
        x: u16,
        y: u32,
    }

    let mut x = Cursor::new(Vec::new());

    Test {
        little: TestLittle { x: 1, y: 2 },
        big: TestInheritBig { x: 3, y: 4 },
    }
    .write(&mut x)
    .unwrap();

    assert_eq!(x.into_inner(), [1, 0, 2, 0, 0, 0, 0, 3, 0, 0, 0, 4]);
}