n5 0.7.6

Rust implementation of the N5 tensor file system format
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

use std::io::{Read, Write};

use bzip2::Compression as BzCompression;
use bzip2::read::BzDecoder;
use bzip2::write::BzEncoder;
use serde::{
    Deserialize,
    Serialize,
};

use super::{
    Compression,
};


#[derive(Clone, Serialize, Deserialize, PartialEq, Debug)]
#[serde(rename_all = "camelCase")]
pub struct Bzip2Compression {
    #[serde(default = "default_bzip_block_size")]
    block_size: u8,
}

fn default_bzip_block_size() -> u8 {9}

impl Default for Bzip2Compression {
    fn default() -> Bzip2Compression {
        Bzip2Compression {
            block_size: default_bzip_block_size(),
        }
    }
}

impl Compression for Bzip2Compression {
    fn decoder<'a, R: Read + 'a>(&self, r: R) -> Box<dyn Read + 'a> {
        Box::new(BzDecoder::new(r))
    }

    fn encoder<'a, W: Write + 'a>(&self, w: W) -> Box<dyn Write + 'a> {
        Box::new(BzEncoder::new(w, BzCompression::new(u32::from(self.block_size))))
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::compression::CompressionType;

    // Example from the n5 documentation spec.
    const TEST_BLOCK_I16_BZIP2: [u8; 59] = [
        0x00, 0x00,
        0x00, 0x03,
        0x00, 0x00, 0x00, 0x01,
        0x00, 0x00, 0x00, 0x02,
        0x00, 0x00, 0x00, 0x03,
        0x42, 0x5a, 0x68, 0x39,
        0x31, 0x41, 0x59, 0x26,
        0x53, 0x59, 0x02, 0x3e,
        0x0d, 0xd2, 0x00, 0x00,
        0x00, 0x40, 0x00, 0x7f,
        0x00, 0x20, 0x00, 0x31,
        0x0c, 0x01, 0x0d, 0x31,
        0xa8, 0x73, 0x94, 0x33,
        0x7c, 0x5d, 0xc9, 0x14,
        0xe1, 0x42, 0x40, 0x08,
        0xf8, 0x37, 0x48,
    ];

    #[test]
    fn test_read_doc_spec_block() {
        crate::tests::test_read_doc_spec_block(
            TEST_BLOCK_I16_BZIP2.as_ref(),
            CompressionType::Bzip2(Bzip2Compression::default()));
    }

    #[test]
    // This test is ignored since the compressed stream differs from Java.
    #[ignore]
    fn test_write_doc_spec_block() {
        crate::tests::test_write_doc_spec_block(
            TEST_BLOCK_I16_BZIP2.as_ref(),
            CompressionType::Bzip2(Bzip2Compression::default()));
    }

    #[test]
    fn test_rw() {
        crate::tests::test_block_compression_rw(CompressionType::Bzip2(Bzip2Compression::default()));
    }
}