rdjpgcom.js

Read text comments from JPEG files using pure JavaScript. Inspired by the CLI tool of the same name, included in the Independet JPEG Group's jpegtran.

Installation

npm install rdjpgcom

Usage

import { readFile } from 'node:fs/promises'
import { rdjpgcom } from 'rdjpgcom'

let buffer = await readFile('image.jpg')
    
// To read all valid UTF-8 comments:
let comments = rdjpgcom(buffer)

// You can pass a different encoding as an option.

// To see all comment segments and their raw `payload` buffers use:
for (let segment of rdjpgcom(buffer, { encoding: null })) {
  segment.payload
}

Acknowledgements

This module is a derived work inspired by rdjpgcom.c and

Copyright (C) 1994-1997, Thomas G. Lane.
Modified 2009 by Bill Allombert, Guido Vollbeding

License

rdjpgcom.js is licensed under the terms of the BSD-2-Clause license. See the LICENSE file for details.