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
use ll;
use ::parse_code;
use std::io::{self, Read};
use std::path;
use std::fs;
pub fn from_continuous(sample_data: &[u8], sample_sizes: &[usize],
max_size: usize)
-> io::Result<Vec<u8>> {
if sample_sizes.iter().sum::<usize>() != sample_data.len() {
return Err(io::Error::new(io::ErrorKind::Other,
"sample sizes don't add up".to_string()));
}
let mut result = Vec::with_capacity(max_size);
unsafe {
let code = ll::ZDICT_trainFromBuffer(result.as_mut_ptr(),
result.capacity(),
sample_data.as_ptr(),
sample_sizes.as_ptr(),
sample_sizes.len());
let written = try!(parse_code(code));
result.set_len(written);
}
Ok(result)
}
pub fn from_samples<S: AsRef<[u8]>>(samples: &[S], max_size: usize)
-> io::Result<Vec<u8>> {
let data: Vec<_> = samples.iter()
.flat_map(|s| s.as_ref())
.cloned()
.collect();
let sizes: Vec<_> = samples.iter().map(|s| s.as_ref().len()).collect();
from_continuous(&data, &sizes, max_size)
}
pub fn from_files<I, P>(filenames: I, max_size: usize) -> io::Result<Vec<u8>>
where P: AsRef<path::Path>,
I: IntoIterator<Item = P>
{
let mut buffer = Vec::new();
let mut sizes = Vec::new();
for filename in filenames {
let mut file = try!(fs::File::open(filename));
let len = try!(file.read_to_end(&mut buffer));
sizes.push(len);
}
from_continuous(&buffer, &sizes, max_size)
}
#[cfg(test)]
mod tests {
use std::fs;
use std::io;
use std::io::Read;
#[test]
fn test_dict_training() {
let paths: Vec<_> = fs::read_dir("src")
.unwrap()
.map(|entry| entry.unwrap())
.map(|entry| entry.path())
.filter(|path| path.to_str().unwrap().ends_with(".rs"))
.collect();
let dict = super::from_files(&paths, 4000).unwrap();
for path in paths {
let mut buffer = Vec::new();
let mut file = fs::File::open(path).unwrap();
let mut content = Vec::new();
file.read_to_end(&mut content).unwrap();
io::copy(&mut &content[..],
&mut ::stream::Encoder::with_dictionary(&mut buffer,
1,
&dict)
.unwrap()
.auto_finish())
.unwrap();
let mut result = Vec::new();
io::copy(&mut ::stream::Decoder::with_dictionary(&buffer[..],
&dict[..])
.unwrap(),
&mut result)
.unwrap();
assert_eq!(&content, &result);
}
}
}