forked from nodejs/node
-
Notifications
You must be signed in to change notification settings - Fork 0
/
buffer-from.js
98 lines (95 loc) · 2.18 KB
/
buffer-from.js
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
'use strict';
const common = require('../common.js');
const assert = require('assert');
const bench = common.createBenchmark(main, {
source: [
'array',
'arraybuffer',
'arraybuffer-middle',
'buffer',
'uint8array',
'string',
'string-utf8',
'string-base64',
'object',
],
len: [10, 2048],
n: [2048]
});
function main({ len, n, source }) {
const array = new Array(len).fill(42);
const arrayBuf = new ArrayBuffer(len);
const str = 'a'.repeat(len);
const buffer = Buffer.allocUnsafe(len);
const uint8array = new Uint8Array(len);
const obj = { length: null }; // Results in a new, empty Buffer
switch (source) {
case 'array':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(array);
}
bench.end(n);
break;
case 'arraybuffer':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(arrayBuf);
}
bench.end(n);
break;
case 'arraybuffer-middle':
const offset = ~~(len / 4);
const length = ~~(len / 2);
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(arrayBuf, offset, length);
}
bench.end(n);
break;
case 'buffer':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(buffer);
}
bench.end(n);
break;
case 'uint8array':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(uint8array);
}
bench.end(n);
break;
case 'string':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(str);
}
bench.end(n);
break;
case 'string-utf8':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(str, 'utf8');
}
bench.end(n);
break;
case 'string-base64':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(str, 'base64');
}
bench.end(n);
break;
case 'object':
bench.start();
for (let i = 0; i < n * 1024; i++) {
Buffer.from(obj);
}
bench.end(n);
break;
default:
assert.fail('Should not get here');
}
}