SimpleZIP.js

A light-weight library for building uncompressed ZIP files, in NodeJS or in the Browser.

Getting Started

With NPM / NodeJS

npm install --save simplezip.js

And then

const SimpleZip = require("simplezip.js");
const fs = require("fs");

let files = [{
    name: "FirstFile.txt",
    data: "The contents"
}, {
    name: "SecondFile.txt",
    data: Buffer.from("Also, the contents",'utf8')
}];

// This returns an ArrayBuffer
let data = SimpleZip.GenerateZipFrom(files);

fs.writeFileSync("output.zip", new Buffer(data), {encoding: 'binary'});

With HTML / Javascript

It's easy! Add simplezip.min.js to your project, then add

<script type="text/javascript" src="?...../simplezip.min.js"></script>

to your headers, and then:

var files = [{
    name: "FirstFile.txt",
    data: "The contents"
}, {
    name: "SecondFile.txt",
    data: new Uint8Array([65, 66, 67, 68])
}];

var data = SimpleZip.GenerateZipFrom(files);
// Can then convert to a blob and download the file
var blob = new Blob([data], {type: "octet/stream"});
var url = window.URL.createObjectURL(blob);

// Append to document, or whatever you want to do
var el = document.createElement("a");
el.href = url;
el.target = '_blank';
el.download = "output.zip";
el.innerHTML = "Download!"
document.getElementsByTagName("body")[0].appendChild(el);

API

• SimpleZip.GenerateZipFrom()
• new SimpleZip()
• SimpleZip#appendFiles()
• SimpleZip#appendFile()
• SimpleZip#generate()
• SimpleZip#ensureRemainingSpace()

Note that all 'files' passed to the SimpleZip API should be of the form

{
    name:string,
    data:ArrayBuffer|Uint8Array|string
}

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SimpleZip.GenerateZipFrom([files])

A static method to create the entire ZIP file all at once. This allocates the exact amount of space required, and fills it with the files specified.

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new SimpleZip(expectedSize)

Creates a new SimpleZip object, and allocates expectedSize bytes for the entire ZIP file. If this isn't enough, it will re-allocate later when adding new files.

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SimpleZip#appendFiles([files])

Appends the specified files to the ZIP file. Will re-allocate space to fit them all if required.

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SimpleZip#appendFile(file)

Just a helper function. Calls appendFiles with the file wrapped in an array.

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SimpleZip#generate()

Appends the final ZIP records, and returns the ZIP file in an ArrayBuffer. Will re-allocate space to fit the extra records if required.

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SimpleZip#ensureRemainingSpace(remaining)

Expands the capacity of the underlying ArrayBuffer to ensure at least remaining bytes are free to be filled. This also includes ZIP entry records and headers etc. So if you're resizing it to fit a file with a certain size, then add about 100 bytes more per file for the file names and ZIP entries etc.

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