Zlib

源代码: lib/zlib.js

node:zlib 模块提供了使用 Gzip、Deflate/Inflate 和 Brotli 实现的压缩功能。

🌐 The node:zlib module provides compression functionality implemented using Gzip, Deflate/Inflate, and Brotli.

要访问它：

🌐 To access it:

const zlib = require('node:zlib'); 拷贝

压缩和解压缩是围绕 Node.js 流 API 构建的。

🌐 Compression and decompression are built around the Node.js Streams API.

通过将源流通过 zlib 的 Transform 流传入目标流，可以实现对流（例如文件）的压缩或解压缩：

🌐 Compressing or decompressing a stream (such as a file) can be accomplished by piping the source stream through a zlib Transform stream into a destination stream:

const { createGzip } = require('node:zlib');
const { pipeline } = require('node:stream');
const {
  createReadStream,
  createWriteStream
} = require('node:fs');

const gzip = createGzip();
const source = createReadStream('input.txt');
const destination = createWriteStream('input.txt.gz');

pipeline(source, gzip, destination, (err) => {
  if (err) {
    console.error('An error occurred:', err);
    process.exitCode = 1;
  }
});

// Or, Promisified

const { promisify } = require('node:util');
const pipe = promisify(pipeline);

async function do_gzip(input, output) {
  const gzip = createGzip();
  const source = createReadStream(input);
  const destination = createWriteStream(output);
  await pipe(source, gzip, destination);
}

do_gzip('input.txt', 'input.txt.gz')
  .catch((err) => {
    console.error('An error occurred:', err);
    process.exitCode = 1;
  }); 拷贝

也可以一步压缩或解压缩数据：

🌐 It is also possible to compress or decompress data in a single step:

const { deflate, unzip } = require('node:zlib');

const input = '.................................';
deflate(input, (err, buffer) => {
  if (err) {
    console.error('An error occurred:', err);
    process.exitCode = 1;
  }
  console.log(buffer.toString('base64'));
});

const buffer = Buffer.from('eJzT0yMAAGTvBe8=', 'base64');
unzip(buffer, (err, buffer) => {
  if (err) {
    console.error('An error occurred:', err);
    process.exitCode = 1;
  }
  console.log(buffer.toString());
});

// Or, Promisified

const { promisify } = require('node:util');
const do_unzip = promisify(unzip);

do_unzip(buffer)
  .then((buf) => console.log(buf.toString()))
  .catch((err) => {
    console.error('An error occurred:', err);
    process.exitCode = 1;
  }); 拷贝