use crate::database::LocateDb;
use structview::{u32_be, View};

#[derive(Clone, Copy, View)]
#[repr(C)]
pub struct MlHeader {
    magic: [u8; 8], /* '\0', 'm', 'l', 'o', 'c', 'a', 't', 'e' */
    conf_size: u32_be,
    version: u8,
    check_visibility: u8,
    pad: [u8; 2],
}

impl LocateDb for MlHeader {
    fn is(magic: &[u8]) -> bool {
        if magic.len() < 32 {
            false
        } else {
            match MlHeader::view(&magic[0..32]) {
                Ok(header) => header.magic[0..8] == *b"\0mlocate" && header.version == 0,
                Err(_) => false,
            }
        }
    }
}