zlib 压缩
稳定性: 2 - 稳定
源代码: lib/zlib.js
zlib
模块提供了使用 Gzip、Deflate/Inflate、以及 Brotli 实现的压缩功能。
要访问它:
const zlib = require('zlib');
压缩和解压缩是围绕 Node.js 流 API 构建的。
压缩或解压缩流(例如文件)可以通过将源流通过 zlib
Transform
流管道传输到目标流来完成:
const { createGzip } = require('zlib');
const { pipeline } = require('stream');
const {
createReadStream,
createWriteStream
} = require('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;
}
});
// 或者,promise 化
const { promisify } = require('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;
});
也可以一步压缩或解压缩数据:
const { deflate, unzip } = require('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());
});
// 或者,promise 化
const { promisify } = require('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;
});
Stability: 2 - Stable
Source Code: lib/zlib.js
The zlib
module provides compression functionality implemented using Gzip,
Deflate/Inflate, and Brotli.
To access it:
const zlib = require('zlib');
Compression and decompression are built around the Node.js Streams API.
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('zlib');
const { pipeline } = require('stream');
const {
createReadStream,
createWriteStream
} = require('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('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;
});
It is also possible to compress or decompress data in a single step:
const { deflate, unzip } = require('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('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;
});