binary_cookies/sync/
cursor.rs

1use std::{fs::File, io::Read};
2
3pub trait CookieCursor {
4    type Cursor<'a>: Read + 'a
5    where
6        Self: 'a;
7
8    fn cursor_at(&self, offset: u64) -> Self::Cursor<'_>;
9}
10
11impl CookieCursor for &[u8] {
12    type Cursor<'a>
13        = &'a [u8]
14    where
15        Self: 'a;
16
17    fn cursor_at(&self, offset: u64) -> Self::Cursor<'_> {
18        &self[offset as usize..]
19    }
20}
21
22impl CookieCursor for Vec<u8> {
23    type Cursor<'a>
24        = &'a [u8]
25    where
26        Self: 'a;
27
28    fn cursor_at(&self, offset: u64) -> Self::Cursor<'_> {
29        &self[offset as usize..]
30    }
31}
32
33impl CookieCursor for File {
34    type Cursor<'a>
35        = positioned_io::Cursor<&'a Self>
36    where
37        Self: 'a;
38
39    fn cursor_at(&self, offset: u64) -> Self::Cursor<'_> {
40        positioned_io::Cursor::new_pos(self, offset)
41    }
42}
binary_cookies/sync/cursor.rs

binary_cookies/sync/
cursor.rs
