bitpacking-plus 0.2.0

Wrappers of bitpacking with extra pack formats
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
129
130
131
132

use super::BitPackOps;

use bitpacking::{BitPacker, BitPacker1x, BitPacker8x};
use rand::{thread_rng, Rng};

#[derive(Debug)]
enum PackMethod {
    Vanilla,
    M1,
    D1,
    D1Z,
}

fn test_unpack_helper(
    bitpacker: &dyn BitPackOps,
    decompressed: &[u32],
    compressed: &mut [u8],
    block_size: usize,
    pack_method: PackMethod,
) {
    println!("Test method: {:?}", &pack_method);
    let initial = decompressed[0];
    let n1 = match pack_method {
        PackMethod::Vanilla => {
            bitpacker.pack(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
        PackMethod::M1 => {
            bitpacker.pack_m1(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
        PackMethod::D1 => {
            bitpacker.pack_d1(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
        PackMethod::D1Z => {
            bitpacker.pack_d1z(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
    };
    let num_bits = 8 * n1 / block_size;
    let mut new_decompressed = [0_u32; 256];
    let n2 = match pack_method {
        PackMethod::Vanilla => bitpacker.unpack(compressed, &mut new_decompressed, num_bits as u8),
        PackMethod::M1 => bitpacker.unpack_m1(compressed, &mut new_decompressed, num_bits as u8),
        PackMethod::D1 => {
            bitpacker.unpack_d1(initial, compressed, &mut new_decompressed, num_bits as u8)
        }
        PackMethod::D1Z => {
            bitpacker.unpack_d1z(initial, compressed, &mut new_decompressed, num_bits as u8)
        }
    };
    assert_eq!(n1, n2);
    assert_eq!(
        decompressed.get(0..block_size).unwrap(),
        new_decompressed.get(0..block_size).unwrap()
    );
    println!("Bytes used: {}", n1);
    println!(
        "Decompresed: {:?}\n",
        new_decompressed.get(0..block_size).unwrap()
    );
}

#[test]
fn test_all() {
    let mut my_data: [u32; 256] = [(); 256].map(|_| thread_rng().gen_range(0..20000));
    println!("Orignial: {:?}\n", my_data);

    let mut compressed = [0_u8; 8192];

    let bitpacker1 = BitPacker1x::new();
    let bitpacker8 = BitPacker8x::new();

    test_unpack_helper(
        &bitpacker1,
        &my_data,
        &mut compressed,
        BitPacker1x::BLOCK_LEN,
        PackMethod::Vanilla,
    );
    test_unpack_helper(
        &bitpacker8,
        &my_data,
        &mut compressed,
        BitPacker8x::BLOCK_LEN,
        PackMethod::Vanilla,
    );

    test_unpack_helper(
        &bitpacker1,
        &my_data,
        &mut compressed,
        BitPacker1x::BLOCK_LEN,
        PackMethod::M1,
    );
    test_unpack_helper(
        &bitpacker8,
        &my_data,
        &mut compressed,
        BitPacker8x::BLOCK_LEN,
        PackMethod::M1,
    );

    test_unpack_helper(
        &bitpacker1,
        &my_data,
        &mut compressed,
        BitPacker1x::BLOCK_LEN,
        PackMethod::D1Z,
    );
    test_unpack_helper(
        &bitpacker8,
        &my_data,
        &mut compressed,
        BitPacker8x::BLOCK_LEN,
        PackMethod::D1Z,
    );

    my_data.sort();

    test_unpack_helper(
        &bitpacker1,
        &my_data,
        &mut compressed,
        BitPacker1x::BLOCK_LEN,
        PackMethod::D1,
    );
    test_unpack_helper(
        &bitpacker8,
        &my_data,
        &mut compressed,
        BitPacker8x::BLOCK_LEN,
        PackMethod::D1,
    );
}