smol-bytes 0.1.7

High-performance, clone-efficient byte buffers optimized for small data.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

#![warn(rust_2018_idioms)]

use smol_bytes::{Buf, Bytes};
#[cfg(feature = "std")]
use std::io::IoSlice;

#[test]
fn collect_two_bufs() {
  let a = Bytes::from(&b"hello"[..]);
  let b = Bytes::from(&b"world"[..]);

  let res = a.chain(b).copy_to_bytes(10);
  assert_eq!(res, &b"helloworld"[..]);
}

#[test]
fn iterating_two_bufs() {
  let a = Bytes::from(&b"hello"[..]);
  let b = Bytes::from(&b"world"[..]);

  let res: Vec<u8> = a.chain(b).into_iter().collect();
  assert_eq!(res, &b"helloworld"[..]);
}

#[cfg(feature = "std")]
#[test]
fn vectored_read() {
  let a = Bytes::from(&b"hello"[..]);
  let b = Bytes::from(&b"world"[..]);

  let mut buf = a.chain(b);

  {
    let b1: &[u8] = &mut [];
    let b2: &[u8] = &mut [];
    let b3: &[u8] = &mut [];
    let b4: &[u8] = &mut [];
    let mut iovecs = [
      IoSlice::new(b1),
      IoSlice::new(b2),
      IoSlice::new(b3),
      IoSlice::new(b4),
    ];

    assert_eq!(2, buf.chunks_vectored(&mut iovecs));
    assert_eq!(iovecs[0][..], b"hello"[..]);
    assert_eq!(iovecs[1][..], b"world"[..]);
    assert_eq!(iovecs[2][..], b""[..]);
    assert_eq!(iovecs[3][..], b""[..]);
  }

  buf.advance(2);

  {
    let b1: &[u8] = &mut [];
    let b2: &[u8] = &mut [];
    let b3: &[u8] = &mut [];
    let b4: &[u8] = &mut [];
    let mut iovecs = [
      IoSlice::new(b1),
      IoSlice::new(b2),
      IoSlice::new(b3),
      IoSlice::new(b4),
    ];

    assert_eq!(2, buf.chunks_vectored(&mut iovecs));
    assert_eq!(iovecs[0][..], b"llo"[..]);
    assert_eq!(iovecs[1][..], b"world"[..]);
    assert_eq!(iovecs[2][..], b""[..]);
    assert_eq!(iovecs[3][..], b""[..]);
  }

  buf.advance(3);

  {
    let b1: &[u8] = &mut [];
    let b2: &[u8] = &mut [];
    let b3: &[u8] = &mut [];
    let b4: &[u8] = &mut [];
    let mut iovecs = [
      IoSlice::new(b1),
      IoSlice::new(b2),
      IoSlice::new(b3),
      IoSlice::new(b4),
    ];

    assert_eq!(1, buf.chunks_vectored(&mut iovecs));
    assert_eq!(iovecs[0][..], b"world"[..]);
    assert_eq!(iovecs[1][..], b""[..]);
    assert_eq!(iovecs[2][..], b""[..]);
    assert_eq!(iovecs[3][..], b""[..]);
  }

  buf.advance(3);

  {
    let b1: &[u8] = &mut [];
    let b2: &[u8] = &mut [];
    let b3: &[u8] = &mut [];
    let b4: &[u8] = &mut [];
    let mut iovecs = [
      IoSlice::new(b1),
      IoSlice::new(b2),
      IoSlice::new(b3),
      IoSlice::new(b4),
    ];

    assert_eq!(1, buf.chunks_vectored(&mut iovecs));
    assert_eq!(iovecs[0][..], b"ld"[..]);
    assert_eq!(iovecs[1][..], b""[..]);
    assert_eq!(iovecs[2][..], b""[..]);
    assert_eq!(iovecs[3][..], b""[..]);
  }
}

#[test]
fn chain_get_bytes() {
  let mut ab = Bytes::copy_from_slice(b"ab");
  let mut cd = Bytes::copy_from_slice(b"cd");
  let mut chain = (&mut ab).chain(&mut cd);
  let a = chain.copy_to_bytes(1);
  let bc = chain.copy_to_bytes(2);
  let d = chain.copy_to_bytes(1);

  assert_eq!(Bytes::copy_from_slice(b"a"), a);
  assert_eq!(Bytes::copy_from_slice(b"bc"), bc);
  assert_eq!(Bytes::copy_from_slice(b"d"), d);
}