Introduction to binary-parser

The binary-parser library is a powerful tool for parsing and manipulating binary data in Node.js. Whether you are working with network protocols, file formats, or binary streams, binary-parser provides an easy-to-use and flexible API for handling binary data in a variety of formats.

Getting Started

First, install the binary-parser library via npm:

  npm install binary-parser  

API Examples

Here are some commonly used APIs in binary-parser:

Creating a Parser

  const Parser = require('binary-parser').Parser;
const myParser = new Parser()
  .uint8('header')
  .uint16le('length')
  .string('message', { length: 20 });
 

Parsing Binary Data

  const buffer = Buffer.from([0x01, 0x02, 0x00, 'H'.charCodeAt(0), 'e'.charCodeAt(0)]);
const result = myParser.parse(buffer); console.log(result);  

Nested Parsers

  const headerParser = new Parser()
  .uint8('msgType')
  .uint32le('timestamp');

const messageParser = new Parser()
  .uint16le('msgLength')
  .nest('header', { type: headerParser })
  .string('content', { length: 16 });

const buffer = Buffer.from([0x01, 0x00, 0x14, 0xd2, 0x02, 0x00, 0x00, 'H', 'e', 'l', 'l', 'o', ' ', 'B', 'i', 'n', 'a', 'r', 'y', '!', 0x00]);
const message = messageParser.parse(buffer); console.log(message);  

Custom Parsing Logic

  const customParser = new Parser()
  .uint8('header')
  .array('payload', {
    type: 'uint8',
    length: 4,
    formatter: (arr) => arr.map(byte => byte + 1)
  });

const buffer = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05]); const result = customParser.parse(buffer); console.log(result);  

Application Example

Let’s build a small application that reads and parses a binary file:

  const fs = require('fs'); const Parser = require('binary-parser').Parser;
const fileParser = new Parser()
  .uint32le('fileSize')
  .string('fileType', { length: 4 })
  .array('data', {
    type: 'uint8',
    length: function() {
      return this.fileSize;
    }
  });

fs.readFile('binaryfile.bin', (err, data) => {
  if (err) throw err;

  const parsedData = fileParser.parse(data);
  console.log(parsedData);
});  

In this example, we read a binary file and use binary-parser to extract the file size, file type, and data content.

With binary-parser, you can efficiently handle complex binary data parsing needs in your Node.js applications.

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