icojs

A JavaScript library to use ICO. Work on both Node.js and Browser.

Install

npm install icojs

Node.js:

const ICO = require('icojs');

Browser:

const ICO = require('icojs/browser')

or

<script type="text/javascript" src="node_modules/icojs/dist/ico.js"></script>

To fully use this library, browsers must support JavaScript typed arrays, Canvas API and Promise. Chrome, Edge 12, Firefox and Safari 9 support these functions.

Example

Node.js:

const fs = require('fs');
const ICO = require('icojs');

const arrayBuffer = new Uint8Array(fs.readFileSync('favicon.ico')).buffer;
ICO.parse(arrayBuffer, 'image/png').then(images => {
  // save as png files
  images.forEach(image => {
    const file = `${image.width}x${image.height}-${image.bit}bit.png`;
    const data = Buffer.from(image.buffer);
    fs.writeFileSync(file, data);
  });
});

Browser:

<input type="file" id="input-file" />
<script>
  document.getElementById('input-file').addEventListener('change', function (evt) {
    // use FileReader for converting File object to ArrayBuffer object
    var reader = new FileReader();
    reader.onload = function (e) {
      ICO.parse(e.target.result).then(function (images) {
        // logs images
        console.dir(images);
      })
    };
    reader.readAsArrayBuffer(evt.target.files[0]);
  }, false);
</script>

Demo

https://egy186.github.io/icojs/#demo

Documentation

• ICO
  • .parse(buffer, [mime]) ⇒ Promise.<Array.<Object>>
  • .isICO(buffer) ⇒ Boolean
  • .noConflict() ⇒ ICO

ICO.parse(buffer, [mime]) ⇒ Promise.<Array.<Object>>

Parse ICO and return some images.

Kind: static method of ICO
Returns: Promise.<Array.<Object>> - Resolves to array of parsed ICO.

• width Number - Image width.
• height Number - Image height.
• bit Number - Image bit depth.
• buffer ArrayBuffer - Image buffer.

| Param | Type | Default | Description | | --- | --- | --- | --- | | buffer | ArrayBuffer | | The ArrayBuffer object contain the TypedArray of a ICO file. | | [mime] | String | image/png | MIME type for output. |

ICO.isICO(buffer) ⇒ Boolean

Check the ArrayBuffer is valid ICO.

Kind: static method of ICO
Returns: Boolean - True if arg is ICO.

| Param | Type | Description | | --- | --- | --- | | buffer | ArrayBuffer | The ArrayBuffer object contain the TypedArray of a ICO file. |

ICO.noConflict() ⇒ ICO

No conflict.

Kind: static method of ICO
Returns: ICO - ICO Object.

License

MIT license