-
Notifications
You must be signed in to change notification settings - Fork 576
/
_fs_writev.mjs
81 lines (71 loc) · 2.33 KB
/
_fs_writev.mjs
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
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.
import { Buffer } from "../buffer.ts";
import { validateBufferArray } from "../internal/fs/utils.mjs";
import { getValidatedFd } from "../internal/fs/utils.mjs";
import { maybeCallback } from "./_fs_common.ts";
export function writev(fd, buffers, position, callback) {
const innerWritev = async (fd, buffers, position) => {
const chunks = [];
const offset = 0;
for (let i = 0; i < buffers.length; i++) {
if (Buffer.isBuffer(buffers[i])) {
chunks.push(buffers[i]);
} else {
chunks.push(new Buffer(buffers[i]));
}
}
if (typeof position === "number") {
await Deno.seekSync(fd, position, Deno.SeekMode.Start);
}
const buffer = Buffer.concat(chunks);
let currentOffset = 0;
while (currentOffset < buffer.byteLength) {
currentOffset += await Deno.writeSync(fd, buffer.subarray(currentOffset));
}
return currentOffset - offset;
};
fd = getValidatedFd(fd);
validateBufferArray(buffers);
callback = maybeCallback(callback || position);
if (buffers.length === 0) {
process.nextTick(callback, null, 0, buffers);
return;
}
if (typeof position !== "number") position = null;
innerWritev(fd, buffers, position).then(
(nwritten) => {
callback(null, nwritten, buffers);
},
(err) => callback(err),
);
}
export function writevSync(fd, buffers, position) {
const innerWritev = (fd, buffers, position) => {
const chunks = [];
const offset = 0;
for (let i = 0; i < buffers.length; i++) {
if (Buffer.isBuffer(buffers[i])) {
chunks.push(buffers[i]);
} else {
chunks.push(new Buffer(buffers[i]));
}
}
if (typeof position === "number") {
Deno.seekSync(fd, position, Deno.SeekMode.Start);
}
const buffer = Buffer.concat(chunks);
let currentOffset = 0;
while (currentOffset < buffer.byteLength) {
currentOffset += Deno.writeSync(fd, buffer.subarray(currentOffset));
}
return currentOffset - offset;
};
fd = getValidatedFd(fd);
validateBufferArray(buffers);
if (buffers.length === 0) {
return 0;
}
if (typeof position !== "number") position = null;
return innerWritev(fd, buffers, position);
}