Read raw bytes to a struct

read_bytes_to_stuct.rs

use std::io::Read;
use std::{mem, slice};

#[repr(C, packed)]
#[derive(Debug, Copy, Clone)]
struct TextStruct {
    u8_number: u8,
    u16_number: u16,
    utf_8_string: [u8; 7],
}

fn main() {
    let buffer: Vec<u8> = vec![
        0x71, // u8
        0xb4, 0x50, // u16
        0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x21, // slice of utf 8 char
    ];

    let mut config: TextStruct = unsafe { mem::zeroed() };

    unsafe {
        let config_slice = slice::from_raw_parts_mut(
            &mut config as *mut _ as *mut u8,
            mem::size_of::<TextStruct>(),
        );
        buffer.as_slice().read_exact(config_slice).unwrap();
    }
    println!("{:?}", config);

    let result_string = String::from_utf8(config.utf_8_string.into()).unwrap();
    println!("{:?}", result_string);
}

/* Output:
TextStruct { u8_number: 113, u16_number: 20660, utf_8_string: [72, 101, 108, 108, 111, 32, 33] }
"Hello !"
*/