aaac7fed
 liuqimichale
add
|
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
|
'use strict';
const fs = require('fs');
const stream = require('stream');
const zlib = require('zlib');
const duplexer = require('duplexer');
const pify = require('pify');
const getOptions = options => Object.assign({level: 9}, options);
module.exports = (input, options) => {
if (!input) {
return Promise.resolve(0);
}
// TODO: Remove below comment when new XO release is out
// eslint-disable-next-line no-unused-vars, unicorn/catch-error-name
return pify(zlib.gzip)(input, getOptions(options)).then(data => data.length).catch(_ => 0);
};
module.exports.sync = (input, options) => zlib.gzipSync(input, getOptions(options)).length;
module.exports.stream = options => {
const input = new stream.PassThrough();
const output = new stream.PassThrough();
const wrapper = duplexer(input, output);
let gzipSize = 0;
const gzip = zlib.createGzip(getOptions(options))
.on('data', buf => {
gzipSize += buf.length;
})
.on('error', () => {
wrapper.gzipSize = 0;
})
.on('end', () => {
wrapper.gzipSize = gzipSize;
wrapper.emit('gzip-size', gzipSize);
output.end();
});
input.pipe(gzip);
input.pipe(output, {end: false});
return wrapper;
};
module.exports.file = (path, options) => {
return new Promise((resolve, reject) => {
const stream = fs.createReadStream(path);
stream.on('error', reject);
const gzipStream = stream.pipe(module.exports.stream(options));
gzipStream.on('error', reject);
gzipStream.on('gzip-size', resolve);
});
};
|
