zip-data-in-png

tweetable-polyglot-png in js

Pack up to 3MB of data into a tweetable PNG polyglot file but in nodejs.

Original Repo: https://github.com/DavidBuchanan314/tweetable-polyglot-png

Install

yarn add zip-data-in-png
npm i zip-data-in-png

Status

Currently in beta, please do not use it in productions.

Features

1. Fully Sync
2. In typescript development
3. Works in node.js (Not support web currently)

Why not in python but nodejs

I Don't know.

Normal Usage

zipDataInPng()

Hide a hello.zip into deno.png, and output the file named final.png

import path from "path";
import { zipDataInPng } from 'zip-data-in-png';

zipDataInPng (
    path.join(__dirname, "deno.png"),  // Original data
    path.join(__dirname, "hello.zip"), // .zip file to hide
    path.join(__dirname, "final.png") // Output file
)

---

pngAddHiddenContent()

Hide a hi.zip into cat.png, and return a Uint8Array png Buffer for save in hidden.png.

import fs from "fs";
import { pngAddHiddenContent } from 'zip-data-in-png';

const png_in = fs.readFileSync("cat.png", {flag:'r'});
const content_in = fs.readFileSync("hi.zip", {flag:'r'});

const result: Uint8Array = pngAddHiddenContent (
    png_in,         // Original data
    content_in,     // .zip file to hide
    { quiet: true } // Output file
)

fs.writeFileSync("hidden.png", result);

Sample

Hide a data.zip into deno.png, and output the file named result.png

import path from "path";
import { zipDataInPng } from 'zip-data-in-png';

zipDataInPng (
    path.join(__dirname, "deno.png"),   // Original data
    path.join(__dirname, "data.zip"),   // .zip file to hide
    path.join(__dirname, "result.png") // Output file
)

Notices:

1. The input file MUST be a .png file.
2. Hidden file MUST be a .zip file.
3. If you see ERROR: Input files too big for cover image resolution., means the input .png resolution is too high.

Params

export function zipDataInPng(
    originalPngPath: string,
    inputContentPath: string,
    outputPath: string,
    option?: zipDataInPngOptions
) : boolean

export function pngAddHiddenContent(
    png_in: Buffer, // Png file
    content_in: Buffer, // Zip file
    option?: zipDataInPngOptions
): Uint8Array

interface zipDataInPngOptions {
    quiet: boolean // Default: false, if true then will console.log all info
}

Advance usage

import path from "path";
import { zipDataInPng } from 'zip-data-in-png';

zipDataInPng (
    path.join(__dirname, "deno.png"),   
    path.join(__dirname, "data.zip"),   
    path.join(__dirname, "result.png"), 
    { quiet: false }
)

Logs

1.1

1. Adding function pngAddHiddenContent() for advance usage.