1 pub trait Key {
from_u8(key: &[u8]) -> Self2 fn from_u8(key: &[u8]) -> Self;
as_slice<T, F: Fn(&[u8]) -> T>(&self, f: F) -> T3 fn as_slice<T, F: Fn(&[u8]) -> T>(&self, f: F) -> T;
4 }
5
from_u8<K: Key>(key: &[u8]) -> K6 pub fn from_u8<K: Key>(key: &[u8]) -> K {
7 Key::from_u8(key)
8 }
9
10 impl Key for i32 {
from_u8(key: &[u8]) -> i3211 fn from_u8(key: &[u8]) -> i32 {
12 assert!(key.len() == 4);
13
14 (key[0] as i32) << 24 |
15 (key[1] as i32) << 16 |
16 (key[2] as i32) << 8 |
17 (key[3] as i32)
18 }
19
as_slice<T, F: Fn(&[u8]) -> T>(&self, f: F) -> T20 fn as_slice<T, F: Fn(&[u8]) -> T>(&self, f: F) -> T {
21 let mut dst = [0u8,0,0,0];
22 dst[0] = (*self >> 24) as u8;
23 dst[1] = (*self >> 16) as u8;
24 dst[2] = (*self >> 8) as u8;
25 dst[3] = *self as u8;
26 f(&dst)
27 }
28 }
29