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denoland-deno/ext/node/polyfills/_fs/_fs_writev.mjs
Bartek Iwańczuk b40086fd7d
refactor(core): include_js_files! 'dir' option doesn't change specifiers (#18019)
This commit changes "include_js_files!" macro from "deno_core"
in a way that "dir" option doesn't cause specifiers to be rewritten 
to include it.

Example:
```
include_js_files! {
  dir "js",
  "hello.js",
}
```

The above definition required embedders to use:
`import ... from "internal:<ext_name>/js/hello.js"`. 
But with this change, the "js" directory in which the files are stored
is an implementation detail, which for embedders results in: 
`import ... from "internal:<ext_name>/hello.js"`.

The directory the files are stored in, is an implementation detail and 
in some cases might result in a significant size difference for the 
snapshot. As an example, in "deno_node" extension, we store the 
source code in "polyfills" directory; which resulted in each specifier 
to look like "internal:deno_node/polyfills/<module_name>", but with 
this change it's "internal:deno_node/<module_name>". 

Given that "deno_node" has over 100 files, many of them having 
several import specifiers to the same extension, this change removes
10 characters from each import specifier.
2023-03-05 02:31:38 +00:00

81 lines
2.4 KiB
JavaScript

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.
import { Buffer } from "internal:deno_node/buffer.ts";
import { validateBufferArray } from "internal:deno_node/internal/fs/utils.mjs";
import { getValidatedFd } from "internal:deno_node/internal/fs/utils.mjs";
import { maybeCallback } from "internal:deno_node/_fs/_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(Buffer.from(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(Buffer.from(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);
}