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Changelog
====
## v2.0.0
- Removed built-in `Promise` polyfill
- Some APIs that returned `Promise`s now return bare values.
- Removed Bower support
- Added ES module support
- Added TypeScript support
- Added `arrayBufferToBinaryString()` and `binaryStringToArrayBuffer()`
## v1.0.0
- Initial release

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blob-util [![Build Status](https://travis-ci.org/nolanlawson/blob-util.svg)](https://travis-ci.org/nolanlawson/blob-util) [![TypeScript](https://img.shields.io/badge/%3C%2F%3E-typescript-blue.svg)](http://www.typescriptlang.org/)
=====
`blob-util` is a [Blob](https://developer.mozilla.org/en-US/docs/Web/API/Blob?redirectlocale=en-US&redirectslug=DOM%2FBlob) library for busy people.
It offers a small set of cross-browser utilities for translating Blobs to and from different formats:
* `<img/>` tags
* base 64 strings
* binary strings
* ArrayBuffers
* data URLs
* canvas
It's also a good pairing with the attachment API in [PouchDB](http://pouchdb.com).
**Note**: this is a browser library. For Node.js, see [Buffers](http://nodejs.org/api/buffer.html).
**Topics**:
* [Install](#usage)
* [Browser support](#browser-support)
* [Tutorial](#tutorial)
* [Playground](http://nolanlawson.github.io/blob-util)
* [API](#api)
Install
------
Via npm:
```bash
npm install blob-util
```
ES modules are supported:
```js
import { canvasToBlob } from 'blob-util'
canvasToBlob(canvas, 'image/png').then(/* ... */)
```
Or as a script tag:
```html
<script src="https://unpkg.com/blob-util/dist/blob-util.min.js"></script>
```
Then it's available as a global `blobUtil` object:
```js
blobUtil.canvasToBlob(canvas, 'image/png').then(/* ... */)
```
Browser support
-----
As of v2.0.0, a built-in `Promise` polyfill is no longer provided. Assuming you provide a `Promise`
polyfill, the supported browsers are:
* Firefox
* Chrome
* Edge
* IE 10+
* Safari 6+
* iOS 6+
* Android 4+
* Any browser with either `Blob` or the older `BlobBuilder`; see [caniuse](http://caniuse.com/#search=blob) for details.
Tutorial
--------
Blobs (<strong>b</strong>inary <strong>l</strong>arge <strong>ob</strong>jects) are the modern way of working with binary data in the browser. The browser support is [very good](http://caniuse.com/#search=blob).
Once you have a Blob, you can make it available offline by storing it in [IndexedDB](http://www.w3.org/TR/IndexedDB/), [PouchDB](http://pouchdb.com/), [LocalForage](https://mozilla.github.io/localForage/), or other in-browser databases. So it's the perfect format for working with offline images, sound, and video.
A [File](https://developer.mozilla.org/en-US/docs/Web/API/File) is also a Blob. So if you have an `<input type="file">` in your page, you can let your users upload any file and then work with it as a Blob.
### Example
Here's Kirby. He's a famous little Blob.
<img id="kirby" alt="Kirby" src="./test/kirby.gif"/>
So let's fulfill his destiny, and convert him to a real `Blob` object.
```js
var img = document.getElementById('kirby');
blobUtil.imgSrcToBlob(img.src).then(function (blob) {
// ladies and gents, we have a blob
}).catch(function (err) {
// image failed to load
});
```
(Don't worry, this won't download the image twice, because browsers are smart.)
Now that we have a `Blob`, we can convert it to a URL and use that as the source for another `<img/>` tag:
```js
var blobURL = blobUtil.createObjectURL(blob);
var newImg = document.createElement('img');
newImg.src = blobURL;
document.body.appendChild(newImg);
```
So now we have two Kirbys - one with a normal URL, and the other with a blob URL. You can try this out yourself in the [blob-util playground](http://nolanlawson.github.io/blob-util). Super fun!
<img src="blob-util.gif"/>
API
-------
<!-- begin insert API -->
## Index
### Functions
* [arrayBufferToBinaryString](#arraybuffertobinarystring)
* [arrayBufferToBlob](#arraybuffertoblob)
* [base64StringToBlob](#base64stringtoblob)
* [binaryStringToArrayBuffer](#binarystringtoarraybuffer)
* [binaryStringToBlob](#binarystringtoblob)
* [blobToArrayBuffer](#blobtoarraybuffer)
* [blobToBase64String](#blobtobase64string)
* [blobToBinaryString](#blobtobinarystring)
* [blobToDataURL](#blobtodataurl)
* [canvasToBlob](#canvastoblob)
* [createBlob](#createblob)
* [createObjectURL](#createobjecturl)
* [dataURLToBlob](#dataurltoblob)
* [imgSrcToBlob](#imgsrctoblob)
* [imgSrcToDataURL](#imgsrctodataurl)
* [revokeObjectURL](#revokeobjecturl)
---
## Functions
<a id="arraybuffertobinarystring"></a>
### arrayBufferToBinaryString
**arrayBufferToBinaryString**(buffer: *`ArrayBuffer`*): `string`
Convert an `ArrayBuffer` to a binary string.
Example:
```js
var myString = blobUtil.arrayBufferToBinaryString(arrayBuff)
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| buffer | `ArrayBuffer` | array buffer |
**Returns:** `string`
binary string
___
<a id="arraybuffertoblob"></a>
### arrayBufferToBlob
**arrayBufferToBlob**(buffer: *`ArrayBuffer`*, type?: *`string`*): `Blob`
Convert an `ArrayBuffer` to a `Blob`.
Example:
```js
var blob = blobUtil.arrayBufferToBlob(arrayBuff, 'audio/mpeg');
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| buffer | `ArrayBuffer` | - |
| `Optional` type | `string` | the content type (optional) |
**Returns:** `Blob`
Blob
___
<a id="base64stringtoblob"></a>
### base64StringToBlob
**base64StringToBlob**(base64: *`string`*, type?: *`string`*): `Blob`
Convert a base64-encoded string to a `Blob`.
Example:
```js
var blob = blobUtil.base64StringToBlob(base64String);
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| base64 | `string` | base64-encoded string |
| `Optional` type | `string` | the content type (optional) |
**Returns:** `Blob`
Blob
___
<a id="binarystringtoarraybuffer"></a>
### binaryStringToArrayBuffer
**binaryStringToArrayBuffer**(binary: *`string`*): `ArrayBuffer`
Convert a binary string to an `ArrayBuffer`.
```js
var myBuffer = blobUtil.binaryStringToArrayBuffer(binaryString)
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| binary | `string` | binary string |
**Returns:** `ArrayBuffer`
array buffer
___
<a id="binarystringtoblob"></a>
### binaryStringToBlob
**binaryStringToBlob**(binary: *`string`*, type?: *`string`*): `Blob`
Convert a binary string to a `Blob`.
Example:
```js
var blob = blobUtil.binaryStringToBlob(binaryString);
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| binary | `string` | binary string |
| `Optional` type | `string` | the content type (optional) |
**Returns:** `Blob`
Blob
___
<a id="blobtoarraybuffer"></a>
### blobToArrayBuffer
**blobToArrayBuffer**(blob: *`Blob`*): `Promise`<`ArrayBuffer`>
Convert a `Blob` to an `ArrayBuffer`.
Example:
```js
blobUtil.blobToArrayBuffer(blob).then(function (arrayBuff) {
// success
}).catch(function (err) {
// error
});
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| blob | `Blob` | - |
**Returns:** `Promise`<`ArrayBuffer`>
Promise that resolves with the `ArrayBuffer`
___
<a id="blobtobase64string"></a>
### blobToBase64String
**blobToBase64String**(blob: *`Blob`*): `Promise`<`string`>
Convert a `Blob` to a binary string.
Example:
```js
blobUtil.blobToBase64String(blob).then(function (base64String) {
// success
}).catch(function (err) {
// error
});
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| blob | `Blob` | - |
**Returns:** `Promise`<`string`>
Promise that resolves with the binary string
___
<a id="blobtobinarystring"></a>
### blobToBinaryString
**blobToBinaryString**(blob: *`Blob`*): `Promise`<`string`>
Convert a `Blob` to a binary string.
Example:
```js
blobUtil.blobToBinaryString(blob).then(function (binaryString) {
// success
}).catch(function (err) {
// error
});
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| blob | `Blob` | - |
**Returns:** `Promise`<`string`>
Promise that resolves with the binary string
___
<a id="blobtodataurl"></a>
### blobToDataURL
**blobToDataURL**(blob: *`Blob`*): `Promise`<`string`>
Convert a `Blob` to a data URL string (e.g. `'data:image/png;base64,iVBORw0KG...'`).
Example:
```js
var dataURL = blobUtil.blobToDataURL(blob);
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| blob | `Blob` | - |
**Returns:** `Promise`<`string`>
Promise that resolves with the data URL string
___
<a id="canvastoblob"></a>
### canvasToBlob
**canvasToBlob**(canvas: *`HTMLCanvasElement`*, type?: *`string`*, quality?: *`number`*): `Promise`<`Blob`>
Convert a `canvas` to a `Blob`.
Examples:
```js
blobUtil.canvasToBlob(canvas).then(function (blob) {
// success
}).catch(function (err) {
// error
});
```
Most browsers support converting a canvas to both `'image/png'` and `'image/jpeg'`. You may also want to try `'image/webp'`, which will work in some browsers like Chrome (and in other browsers, will just fall back to `'image/png'`):
```js
blobUtil.canvasToBlob(canvas, 'image/webp').then(function (blob) {
// success
}).catch(function (err) {
// error
});
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| canvas | `HTMLCanvasElement` | HTMLCanvasElement |
| `Optional` type | `string` | the content type (optional, defaults to 'image/png') |
| `Optional` quality | `number` | a number between 0 and 1 indicating image quality if the requested type is 'image/jpeg' or 'image/webp' |
**Returns:** `Promise`<`Blob`>
Promise that resolves with the `Blob`
___
<a id="createblob"></a>
### createBlob
**createBlob**(parts: *`Array`<`any`>*, properties?: * `BlobPropertyBag` &#124; `string`*): `Blob`
Shim for [`new Blob()`](https://developer.mozilla.org/en-US/docs/Web/API/Blob.Blob) to support [older browsers that use the deprecated `BlobBuilder` API](http://caniuse.com/blob).
Example:
```js
var myBlob = blobUtil.createBlob(['hello world'], {type: 'text/plain'});
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| parts | `Array`<`any`> | content of the Blob |
| `Optional` properties | `BlobPropertyBag` &#124; `string`| usually `{type: myContentType}`, you can also pass a string for the content type |
**Returns:** `Blob`
Blob
___
<a id="createobjecturl"></a>
### createObjectURL
**createObjectURL**(blob: *`Blob`*): `string`
Shim for [`URL.createObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL) to support browsers that only have the prefixed `webkitURL` (e.g. Android <4.4).
Example:
```js
var myUrl = blobUtil.createObjectURL(blob);
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| blob | `Blob` | - |
**Returns:** `string`
url
___
<a id="dataurltoblob"></a>
### dataURLToBlob
**dataURLToBlob**(dataURL: *`string`*): `Blob`
Convert a data URL string (e.g. `'data:image/png;base64,iVBORw0KG...'`) to a `Blob`.
Example:
```js
var blob = blobUtil.dataURLToBlob(dataURL);
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| dataURL | `string` | dataURL-encoded string |
**Returns:** `Blob`
Blob
___
<a id="imgsrctoblob"></a>
### imgSrcToBlob
**imgSrcToBlob**(src: *`string`*, type?: *`string`*, crossOrigin?: *`string`*, quality?: *`number`*): `Promise`<`Blob`>
Convert an image's `src` URL to a `Blob` by loading the image and painting it to a `canvas`.
Note: this will coerce the image to the desired content type, and it will only paint the first frame of an animated GIF.
Examples:
```js
blobUtil.imgSrcToBlob('http://mysite.com/img.png').then(function (blob) {
// success
}).catch(function (err) {
// error
});
```
```js
blobUtil.imgSrcToBlob('http://some-other-site.com/img.jpg', 'image/jpeg',
'Anonymous', 1.0).then(function (blob) {
// success
}).catch(function (err) {
// error
});
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| src | `string` | image src |
| `Optional` type | `string` | the content type (optional, defaults to 'image/png') |
| `Optional` crossOrigin | `string` | for CORS-enabled images, set this to 'Anonymous' to avoid "tainted canvas" errors |
| `Optional` quality | `number` | a number between 0 and 1 indicating image quality if the requested type is 'image/jpeg' or 'image/webp' |
**Returns:** `Promise`<`Blob`>
Promise that resolves with the `Blob`
___
<a id="imgsrctodataurl"></a>
### imgSrcToDataURL
**imgSrcToDataURL**(src: *`string`*, type?: *`string`*, crossOrigin?: *`string`*, quality?: *`number`*): `Promise`<`string`>
Convert an image's `src` URL to a data URL by loading the image and painting it to a `canvas`.
Note: this will coerce the image to the desired content type, and it will only paint the first frame of an animated GIF.
Examples:
```js
blobUtil.imgSrcToDataURL('http://mysite.com/img.png').then(function (dataURL) {
// success
}).catch(function (err) {
// error
});
```
```js
blobUtil.imgSrcToDataURL('http://some-other-site.com/img.jpg', 'image/jpeg',
'Anonymous', 1.0).then(function (dataURL) {
// success
}).catch(function (err) {
// error
});
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| src | `string` | image src |
| `Optional` type | `string` | the content type (optional, defaults to 'image/png') |
| `Optional` crossOrigin | `string` | for CORS-enabled images, set this to 'Anonymous' to avoid "tainted canvas" errors |
| `Optional` quality | `number` | a number between 0 and 1 indicating image quality if the requested type is 'image/jpeg' or 'image/webp' |
**Returns:** `Promise`<`string`>
Promise that resolves with the data URL string
___
<a id="revokeobjecturl"></a>
### revokeObjectURL
**revokeObjectURL**(url: *`string`*): `void`
Shim for [`URL.revokeObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.revokeObjectURL) to support browsers that only have the prefixed `webkitURL` (e.g. Android <4.4).
Example:
```js
blobUtil.revokeObjectURL(myUrl);
```
**Parameters:**
| Param | Type | Description |
| ------ | ------ | ------ |
| url | `string` | |
**Returns:** `void`
___
<!-- end insert API -->
Credits
----
Thanks to the rest of [the PouchDB team](https://github.com/pouchdb/pouchdb/graphs/contributors) for figuring most of this crazy stuff out.
Building the library
----
npm install
npm run build
Testing the library
----
npm install
Then to test in the browser using Saucelabs:
npm test
Or to test locally in your browser of choice:
npm run test-local
To build the API docs and insert them in the README:
npm run doc

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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
// TODO: including these in blob-util.ts causes typedoc to generate docs for them,
// even with --excludePrivate ¯\_(ツ)_/¯
/** @private */
function loadImage(src, crossOrigin) {
return new Promise(function (resolve, reject) {
var img = new Image();
if (crossOrigin) {
img.crossOrigin = crossOrigin;
}
img.onload = function () {
resolve(img);
};
img.onerror = reject;
img.src = src;
});
}
/** @private */
function imgToCanvas(img) {
var canvas = document.createElement('canvas');
canvas.width = img.width;
canvas.height = img.height;
// copy the image contents to the canvas
var context = canvas.getContext('2d');
context.drawImage(img, 0, 0, img.width, img.height, 0, 0, img.width, img.height);
return canvas;
}
/* global Promise, Image, Blob, FileReader, atob, btoa,
BlobBuilder, MSBlobBuilder, MozBlobBuilder, WebKitBlobBuilder, webkitURL */
/**
* Shim for
* [`new Blob()`](https://developer.mozilla.org/en-US/docs/Web/API/Blob.Blob)
* to support
* [older browsers that use the deprecated `BlobBuilder` API](http://caniuse.com/blob).
*
* Example:
*
* ```js
* var myBlob = blobUtil.createBlob(['hello world'], {type: 'text/plain'});
* ```
*
* @param parts - content of the Blob
* @param properties - usually `{type: myContentType}`,
* you can also pass a string for the content type
* @returns Blob
*/
function createBlob(parts, properties) {
parts = parts || [];
properties = properties || {};
if (typeof properties === 'string') {
properties = { type: properties }; // infer content type
}
try {
return new Blob(parts, properties);
}
catch (e) {
if (e.name !== 'TypeError') {
throw e;
}
var Builder = typeof BlobBuilder !== 'undefined'
? BlobBuilder : typeof MSBlobBuilder !== 'undefined'
? MSBlobBuilder : typeof MozBlobBuilder !== 'undefined'
? MozBlobBuilder : WebKitBlobBuilder;
var builder = new Builder();
for (var i = 0; i < parts.length; i += 1) {
builder.append(parts[i]);
}
return builder.getBlob(properties.type);
}
}
/**
* Shim for
* [`URL.createObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* var myUrl = blobUtil.createObjectURL(blob);
* ```
*
* @param blob
* @returns url
*/
function createObjectURL(blob) {
return (typeof URL !== 'undefined' ? URL : webkitURL).createObjectURL(blob);
}
/**
* Shim for
* [`URL.revokeObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.revokeObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* blobUtil.revokeObjectURL(myUrl);
* ```
*
* @param url
*/
function revokeObjectURL(url) {
return (typeof URL !== 'undefined' ? URL : webkitURL).revokeObjectURL(url);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBinaryString(blob).then(function (binaryString) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBinaryString(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
var hasBinaryString = typeof reader.readAsBinaryString === 'function';
reader.onloadend = function () {
var result = reader.result || '';
if (hasBinaryString) {
return resolve(result);
}
resolve(arrayBufferToBinaryString(result));
};
reader.onerror = reject;
if (hasBinaryString) {
reader.readAsBinaryString(blob);
}
else {
reader.readAsArrayBuffer(blob);
}
});
}
/**
* Convert a base64-encoded string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.base64StringToBlob(base64String);
* ```
* @param base64 - base64-encoded string
* @param type - the content type (optional)
* @returns Blob
*/
function base64StringToBlob(base64, type) {
var parts = [binaryStringToArrayBuffer(atob(base64))];
return type ? createBlob(parts, { type: type }) : createBlob(parts);
}
/**
* Convert a binary string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.binaryStringToBlob(binaryString);
* ```
*
* @param binary - binary string
* @param type - the content type (optional)
* @returns Blob
*/
function binaryStringToBlob(binary, type) {
return base64StringToBlob(btoa(binary), type);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBase64String(blob).then(function (base64String) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBase64String(blob) {
return blobToBinaryString(blob).then(btoa);
}
/**
* Convert a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`)
* to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.dataURLToBlob(dataURL);
* ```
*
* @param dataURL - dataURL-encoded string
* @returns Blob
*/
function dataURLToBlob(dataURL) {
var type = dataURL.match(/data:([^;]+)/)[1];
var base64 = dataURL.replace(/^[^,]+,/, '');
var buff = binaryStringToArrayBuffer(atob(base64));
return createBlob([buff], { type: type });
}
/**
* Convert a `Blob` to a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`).
*
* Example:
*
* ```js
* var dataURL = blobUtil.blobToDataURL(blob);
* ```
*
* @param blob
* @returns Promise that resolves with the data URL string
*/
function blobToDataURL(blob) {
return blobToBase64String(blob).then(function (base64String) {
return 'data:' + blob.type + ';base64,' + base64String;
});
}
/**
* Convert an image's `src` URL to a data URL by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToDataURL('http://mysite.com/img.png').then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToDataURL('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the data URL string
*/
function imgSrcToDataURL(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvas.toDataURL(type, quality);
});
}
/**
* Convert a `canvas` to a `Blob`.
*
* Examples:
*
* ```js
* blobUtil.canvasToBlob(canvas).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* Most browsers support converting a canvas to both `'image/png'` and `'image/jpeg'`. You may
* also want to try `'image/webp'`, which will work in some browsers like Chrome (and in other browsers, will just fall back to `'image/png'`):
*
* ```js
* blobUtil.canvasToBlob(canvas, 'image/webp').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param canvas - HTMLCanvasElement
* @param type - the content type (optional, defaults to 'image/png')
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function canvasToBlob(canvas, type, quality) {
if (typeof canvas.toBlob === 'function') {
return new Promise(function (resolve) {
canvas.toBlob(resolve, type, quality);
});
}
return Promise.resolve(dataURLToBlob(canvas.toDataURL(type, quality)));
}
/**
* Convert an image's `src` URL to a `Blob` by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToBlob('http://mysite.com/img.png').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToBlob('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function imgSrcToBlob(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvasToBlob(canvas, type, quality);
});
}
/**
* Convert an `ArrayBuffer` to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.arrayBufferToBlob(arrayBuff, 'audio/mpeg');
* ```
*
* @param buffer
* @param type - the content type (optional)
* @returns Blob
*/
function arrayBufferToBlob(buffer, type) {
return createBlob([buffer], type);
}
/**
* Convert a `Blob` to an `ArrayBuffer`.
*
* Example:
*
* ```js
* blobUtil.blobToArrayBuffer(blob).then(function (arrayBuff) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the `ArrayBuffer`
*/
function blobToArrayBuffer(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
reader.onloadend = function () {
var result = reader.result || new ArrayBuffer(0);
resolve(result);
};
reader.onerror = reject;
reader.readAsArrayBuffer(blob);
});
}
/**
* Convert an `ArrayBuffer` to a binary string.
*
* Example:
*
* ```js
* var myString = blobUtil.arrayBufferToBinaryString(arrayBuff)
* ```
*
* @param buffer - array buffer
* @returns binary string
*/
function arrayBufferToBinaryString(buffer) {
var binary = '';
var bytes = new Uint8Array(buffer);
var length = bytes.byteLength;
var i = -1;
while (++i < length) {
binary += String.fromCharCode(bytes[i]);
}
return binary;
}
/**
* Convert a binary string to an `ArrayBuffer`.
*
* ```js
* var myBuffer = blobUtil.binaryStringToArrayBuffer(binaryString)
* ```
*
* @param binary - binary string
* @returns array buffer
*/
function binaryStringToArrayBuffer(binary) {
var length = binary.length;
var buf = new ArrayBuffer(length);
var arr = new Uint8Array(buf);
var i = -1;
while (++i < length) {
arr[i] = binary.charCodeAt(i);
}
return buf;
}
exports.createBlob = createBlob;
exports.createObjectURL = createObjectURL;
exports.revokeObjectURL = revokeObjectURL;
exports.blobToBinaryString = blobToBinaryString;
exports.base64StringToBlob = base64StringToBlob;
exports.binaryStringToBlob = binaryStringToBlob;
exports.blobToBase64String = blobToBase64String;
exports.dataURLToBlob = dataURLToBlob;
exports.blobToDataURL = blobToDataURL;
exports.imgSrcToDataURL = imgSrcToDataURL;
exports.canvasToBlob = canvasToBlob;
exports.imgSrcToBlob = imgSrcToBlob;
exports.arrayBufferToBlob = arrayBufferToBlob;
exports.blobToArrayBuffer = blobToArrayBuffer;
exports.arrayBufferToBinaryString = arrayBufferToBinaryString;
exports.binaryStringToArrayBuffer = binaryStringToArrayBuffer;

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@ -0,0 +1,295 @@
/**
* Shim for
* [`new Blob()`](https://developer.mozilla.org/en-US/docs/Web/API/Blob.Blob)
* to support
* [older browsers that use the deprecated `BlobBuilder` API](http://caniuse.com/blob).
*
* Example:
*
* ```js
* var myBlob = blobUtil.createBlob(['hello world'], {type: 'text/plain'});
* ```
*
* @param parts - content of the Blob
* @param properties - usually `{type: myContentType}`,
* you can also pass a string for the content type
* @returns Blob
*/
export declare function createBlob(parts: Array<any>, properties?: BlobPropertyBag | string): Blob;
/**
* Shim for
* [`URL.createObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* var myUrl = blobUtil.createObjectURL(blob);
* ```
*
* @param blob
* @returns url
*/
export declare function createObjectURL(blob: Blob): string;
/**
* Shim for
* [`URL.revokeObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.revokeObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* blobUtil.revokeObjectURL(myUrl);
* ```
*
* @param url
*/
export declare function revokeObjectURL(url: string): void;
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBinaryString(blob).then(function (binaryString) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
export declare function blobToBinaryString(blob: Blob): Promise<string>;
/**
* Convert a base64-encoded string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.base64StringToBlob(base64String);
* ```
* @param base64 - base64-encoded string
* @param type - the content type (optional)
* @returns Blob
*/
export declare function base64StringToBlob(base64: string, type?: string): Blob;
/**
* Convert a binary string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.binaryStringToBlob(binaryString);
* ```
*
* @param binary - binary string
* @param type - the content type (optional)
* @returns Blob
*/
export declare function binaryStringToBlob(binary: string, type?: string): Blob;
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBase64String(blob).then(function (base64String) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
export declare function blobToBase64String(blob: Blob): Promise<string>;
/**
* Convert a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`)
* to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.dataURLToBlob(dataURL);
* ```
*
* @param dataURL - dataURL-encoded string
* @returns Blob
*/
export declare function dataURLToBlob(dataURL: string): Blob;
/**
* Convert a `Blob` to a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`).
*
* Example:
*
* ```js
* var dataURL = blobUtil.blobToDataURL(blob);
* ```
*
* @param blob
* @returns Promise that resolves with the data URL string
*/
export declare function blobToDataURL(blob: Blob): Promise<string>;
/**
* Convert an image's `src` URL to a data URL by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToDataURL('http://mysite.com/img.png').then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToDataURL('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the data URL string
*/
export declare function imgSrcToDataURL(src: string, type?: string, crossOrigin?: string, quality?: number): Promise<string>;
/**
* Convert a `canvas` to a `Blob`.
*
* Examples:
*
* ```js
* blobUtil.canvasToBlob(canvas).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* Most browsers support converting a canvas to both `'image/png'` and `'image/jpeg'`. You may
* also want to try `'image/webp'`, which will work in some browsers like Chrome (and in other browsers, will just fall back to `'image/png'`):
*
* ```js
* blobUtil.canvasToBlob(canvas, 'image/webp').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param canvas - HTMLCanvasElement
* @param type - the content type (optional, defaults to 'image/png')
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
export declare function canvasToBlob(canvas: HTMLCanvasElement, type?: string, quality?: number): Promise<Blob>;
/**
* Convert an image's `src` URL to a `Blob` by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToBlob('http://mysite.com/img.png').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToBlob('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
export declare function imgSrcToBlob(src: string, type?: string, crossOrigin?: string, quality?: number): Promise<Blob>;
/**
* Convert an `ArrayBuffer` to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.arrayBufferToBlob(arrayBuff, 'audio/mpeg');
* ```
*
* @param buffer
* @param type - the content type (optional)
* @returns Blob
*/
export declare function arrayBufferToBlob(buffer: ArrayBuffer, type?: string): Blob;
/**
* Convert a `Blob` to an `ArrayBuffer`.
*
* Example:
*
* ```js
* blobUtil.blobToArrayBuffer(blob).then(function (arrayBuff) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the `ArrayBuffer`
*/
export declare function blobToArrayBuffer(blob: Blob): Promise<ArrayBuffer>;
/**
* Convert an `ArrayBuffer` to a binary string.
*
* Example:
*
* ```js
* var myString = blobUtil.arrayBufferToBinaryString(arrayBuff)
* ```
*
* @param buffer - array buffer
* @returns binary string
*/
export declare function arrayBufferToBinaryString(buffer: ArrayBuffer): string;
/**
* Convert a binary string to an `ArrayBuffer`.
*
* ```js
* var myBuffer = blobUtil.binaryStringToArrayBuffer(binaryString)
* ```
*
* @param binary - binary string
* @returns array buffer
*/
export declare function binaryStringToArrayBuffer(binary: string): ArrayBuffer;

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@ -0,0 +1,435 @@
// TODO: including these in blob-util.ts causes typedoc to generate docs for them,
// even with --excludePrivate ¯\_(ツ)_/¯
/** @private */
function loadImage(src, crossOrigin) {
return new Promise(function (resolve, reject) {
var img = new Image();
if (crossOrigin) {
img.crossOrigin = crossOrigin;
}
img.onload = function () {
resolve(img);
};
img.onerror = reject;
img.src = src;
});
}
/** @private */
function imgToCanvas(img) {
var canvas = document.createElement('canvas');
canvas.width = img.width;
canvas.height = img.height;
// copy the image contents to the canvas
var context = canvas.getContext('2d');
context.drawImage(img, 0, 0, img.width, img.height, 0, 0, img.width, img.height);
return canvas;
}
/* global Promise, Image, Blob, FileReader, atob, btoa,
BlobBuilder, MSBlobBuilder, MozBlobBuilder, WebKitBlobBuilder, webkitURL */
/**
* Shim for
* [`new Blob()`](https://developer.mozilla.org/en-US/docs/Web/API/Blob.Blob)
* to support
* [older browsers that use the deprecated `BlobBuilder` API](http://caniuse.com/blob).
*
* Example:
*
* ```js
* var myBlob = blobUtil.createBlob(['hello world'], {type: 'text/plain'});
* ```
*
* @param parts - content of the Blob
* @param properties - usually `{type: myContentType}`,
* you can also pass a string for the content type
* @returns Blob
*/
function createBlob(parts, properties) {
parts = parts || [];
properties = properties || {};
if (typeof properties === 'string') {
properties = { type: properties }; // infer content type
}
try {
return new Blob(parts, properties);
}
catch (e) {
if (e.name !== 'TypeError') {
throw e;
}
var Builder = typeof BlobBuilder !== 'undefined'
? BlobBuilder : typeof MSBlobBuilder !== 'undefined'
? MSBlobBuilder : typeof MozBlobBuilder !== 'undefined'
? MozBlobBuilder : WebKitBlobBuilder;
var builder = new Builder();
for (var i = 0; i < parts.length; i += 1) {
builder.append(parts[i]);
}
return builder.getBlob(properties.type);
}
}
/**
* Shim for
* [`URL.createObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* var myUrl = blobUtil.createObjectURL(blob);
* ```
*
* @param blob
* @returns url
*/
function createObjectURL(blob) {
return (typeof URL !== 'undefined' ? URL : webkitURL).createObjectURL(blob);
}
/**
* Shim for
* [`URL.revokeObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.revokeObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* blobUtil.revokeObjectURL(myUrl);
* ```
*
* @param url
*/
function revokeObjectURL(url) {
return (typeof URL !== 'undefined' ? URL : webkitURL).revokeObjectURL(url);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBinaryString(blob).then(function (binaryString) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBinaryString(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
var hasBinaryString = typeof reader.readAsBinaryString === 'function';
reader.onloadend = function () {
var result = reader.result || '';
if (hasBinaryString) {
return resolve(result);
}
resolve(arrayBufferToBinaryString(result));
};
reader.onerror = reject;
if (hasBinaryString) {
reader.readAsBinaryString(blob);
}
else {
reader.readAsArrayBuffer(blob);
}
});
}
/**
* Convert a base64-encoded string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.base64StringToBlob(base64String);
* ```
* @param base64 - base64-encoded string
* @param type - the content type (optional)
* @returns Blob
*/
function base64StringToBlob(base64, type) {
var parts = [binaryStringToArrayBuffer(atob(base64))];
return type ? createBlob(parts, { type: type }) : createBlob(parts);
}
/**
* Convert a binary string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.binaryStringToBlob(binaryString);
* ```
*
* @param binary - binary string
* @param type - the content type (optional)
* @returns Blob
*/
function binaryStringToBlob(binary, type) {
return base64StringToBlob(btoa(binary), type);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBase64String(blob).then(function (base64String) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBase64String(blob) {
return blobToBinaryString(blob).then(btoa);
}
/**
* Convert a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`)
* to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.dataURLToBlob(dataURL);
* ```
*
* @param dataURL - dataURL-encoded string
* @returns Blob
*/
function dataURLToBlob(dataURL) {
var type = dataURL.match(/data:([^;]+)/)[1];
var base64 = dataURL.replace(/^[^,]+,/, '');
var buff = binaryStringToArrayBuffer(atob(base64));
return createBlob([buff], { type: type });
}
/**
* Convert a `Blob` to a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`).
*
* Example:
*
* ```js
* var dataURL = blobUtil.blobToDataURL(blob);
* ```
*
* @param blob
* @returns Promise that resolves with the data URL string
*/
function blobToDataURL(blob) {
return blobToBase64String(blob).then(function (base64String) {
return 'data:' + blob.type + ';base64,' + base64String;
});
}
/**
* Convert an image's `src` URL to a data URL by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToDataURL('http://mysite.com/img.png').then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToDataURL('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the data URL string
*/
function imgSrcToDataURL(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvas.toDataURL(type, quality);
});
}
/**
* Convert a `canvas` to a `Blob`.
*
* Examples:
*
* ```js
* blobUtil.canvasToBlob(canvas).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* Most browsers support converting a canvas to both `'image/png'` and `'image/jpeg'`. You may
* also want to try `'image/webp'`, which will work in some browsers like Chrome (and in other browsers, will just fall back to `'image/png'`):
*
* ```js
* blobUtil.canvasToBlob(canvas, 'image/webp').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param canvas - HTMLCanvasElement
* @param type - the content type (optional, defaults to 'image/png')
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function canvasToBlob(canvas, type, quality) {
if (typeof canvas.toBlob === 'function') {
return new Promise(function (resolve) {
canvas.toBlob(resolve, type, quality);
});
}
return Promise.resolve(dataURLToBlob(canvas.toDataURL(type, quality)));
}
/**
* Convert an image's `src` URL to a `Blob` by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToBlob('http://mysite.com/img.png').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToBlob('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function imgSrcToBlob(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvasToBlob(canvas, type, quality);
});
}
/**
* Convert an `ArrayBuffer` to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.arrayBufferToBlob(arrayBuff, 'audio/mpeg');
* ```
*
* @param buffer
* @param type - the content type (optional)
* @returns Blob
*/
function arrayBufferToBlob(buffer, type) {
return createBlob([buffer], type);
}
/**
* Convert a `Blob` to an `ArrayBuffer`.
*
* Example:
*
* ```js
* blobUtil.blobToArrayBuffer(blob).then(function (arrayBuff) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the `ArrayBuffer`
*/
function blobToArrayBuffer(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
reader.onloadend = function () {
var result = reader.result || new ArrayBuffer(0);
resolve(result);
};
reader.onerror = reject;
reader.readAsArrayBuffer(blob);
});
}
/**
* Convert an `ArrayBuffer` to a binary string.
*
* Example:
*
* ```js
* var myString = blobUtil.arrayBufferToBinaryString(arrayBuff)
* ```
*
* @param buffer - array buffer
* @returns binary string
*/
function arrayBufferToBinaryString(buffer) {
var binary = '';
var bytes = new Uint8Array(buffer);
var length = bytes.byteLength;
var i = -1;
while (++i < length) {
binary += String.fromCharCode(bytes[i]);
}
return binary;
}
/**
* Convert a binary string to an `ArrayBuffer`.
*
* ```js
* var myBuffer = blobUtil.binaryStringToArrayBuffer(binaryString)
* ```
*
* @param binary - binary string
* @returns array buffer
*/
function binaryStringToArrayBuffer(binary) {
var length = binary.length;
var buf = new ArrayBuffer(length);
var arr = new Uint8Array(buf);
var i = -1;
while (++i < length) {
arr[i] = binary.charCodeAt(i);
}
return buf;
}
export { createBlob, createObjectURL, revokeObjectURL, blobToBinaryString, base64StringToBlob, binaryStringToBlob, blobToBase64String, dataURLToBlob, blobToDataURL, imgSrcToDataURL, canvasToBlob, imgSrcToBlob, arrayBufferToBlob, blobToArrayBuffer, arrayBufferToBinaryString, binaryStringToArrayBuffer };

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(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(factory((global.blobUtil = {})));
}(this, (function (exports) { 'use strict';
// TODO: including these in blob-util.ts causes typedoc to generate docs for them,
// even with --excludePrivate ¯\_(ツ)_/¯
/** @private */
function loadImage(src, crossOrigin) {
return new Promise(function (resolve, reject) {
var img = new Image();
if (crossOrigin) {
img.crossOrigin = crossOrigin;
}
img.onload = function () {
resolve(img);
};
img.onerror = reject;
img.src = src;
});
}
/** @private */
function imgToCanvas(img) {
var canvas = document.createElement('canvas');
canvas.width = img.width;
canvas.height = img.height;
// copy the image contents to the canvas
var context = canvas.getContext('2d');
context.drawImage(img, 0, 0, img.width, img.height, 0, 0, img.width, img.height);
return canvas;
}
/* global Promise, Image, Blob, FileReader, atob, btoa,
BlobBuilder, MSBlobBuilder, MozBlobBuilder, WebKitBlobBuilder, webkitURL */
/**
* Shim for
* [`new Blob()`](https://developer.mozilla.org/en-US/docs/Web/API/Blob.Blob)
* to support
* [older browsers that use the deprecated `BlobBuilder` API](http://caniuse.com/blob).
*
* Example:
*
* ```js
* var myBlob = blobUtil.createBlob(['hello world'], {type: 'text/plain'});
* ```
*
* @param parts - content of the Blob
* @param properties - usually `{type: myContentType}`,
* you can also pass a string for the content type
* @returns Blob
*/
function createBlob(parts, properties) {
parts = parts || [];
properties = properties || {};
if (typeof properties === 'string') {
properties = { type: properties }; // infer content type
}
try {
return new Blob(parts, properties);
}
catch (e) {
if (e.name !== 'TypeError') {
throw e;
}
var Builder = typeof BlobBuilder !== 'undefined'
? BlobBuilder : typeof MSBlobBuilder !== 'undefined'
? MSBlobBuilder : typeof MozBlobBuilder !== 'undefined'
? MozBlobBuilder : WebKitBlobBuilder;
var builder = new Builder();
for (var i = 0; i < parts.length; i += 1) {
builder.append(parts[i]);
}
return builder.getBlob(properties.type);
}
}
/**
* Shim for
* [`URL.createObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* var myUrl = blobUtil.createObjectURL(blob);
* ```
*
* @param blob
* @returns url
*/
function createObjectURL(blob) {
return (typeof URL !== 'undefined' ? URL : webkitURL).createObjectURL(blob);
}
/**
* Shim for
* [`URL.revokeObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.revokeObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* blobUtil.revokeObjectURL(myUrl);
* ```
*
* @param url
*/
function revokeObjectURL(url) {
return (typeof URL !== 'undefined' ? URL : webkitURL).revokeObjectURL(url);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBinaryString(blob).then(function (binaryString) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBinaryString(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
var hasBinaryString = typeof reader.readAsBinaryString === 'function';
reader.onloadend = function () {
var result = reader.result || '';
if (hasBinaryString) {
return resolve(result);
}
resolve(arrayBufferToBinaryString(result));
};
reader.onerror = reject;
if (hasBinaryString) {
reader.readAsBinaryString(blob);
}
else {
reader.readAsArrayBuffer(blob);
}
});
}
/**
* Convert a base64-encoded string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.base64StringToBlob(base64String);
* ```
* @param base64 - base64-encoded string
* @param type - the content type (optional)
* @returns Blob
*/
function base64StringToBlob(base64, type) {
var parts = [binaryStringToArrayBuffer(atob(base64))];
return type ? createBlob(parts, { type: type }) : createBlob(parts);
}
/**
* Convert a binary string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.binaryStringToBlob(binaryString);
* ```
*
* @param binary - binary string
* @param type - the content type (optional)
* @returns Blob
*/
function binaryStringToBlob(binary, type) {
return base64StringToBlob(btoa(binary), type);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBase64String(blob).then(function (base64String) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBase64String(blob) {
return blobToBinaryString(blob).then(btoa);
}
/**
* Convert a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`)
* to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.dataURLToBlob(dataURL);
* ```
*
* @param dataURL - dataURL-encoded string
* @returns Blob
*/
function dataURLToBlob(dataURL) {
var type = dataURL.match(/data:([^;]+)/)[1];
var base64 = dataURL.replace(/^[^,]+,/, '');
var buff = binaryStringToArrayBuffer(atob(base64));
return createBlob([buff], { type: type });
}
/**
* Convert a `Blob` to a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`).
*
* Example:
*
* ```js
* var dataURL = blobUtil.blobToDataURL(blob);
* ```
*
* @param blob
* @returns Promise that resolves with the data URL string
*/
function blobToDataURL(blob) {
return blobToBase64String(blob).then(function (base64String) {
return 'data:' + blob.type + ';base64,' + base64String;
});
}
/**
* Convert an image's `src` URL to a data URL by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToDataURL('http://mysite.com/img.png').then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToDataURL('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the data URL string
*/
function imgSrcToDataURL(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvas.toDataURL(type, quality);
});
}
/**
* Convert a `canvas` to a `Blob`.
*
* Examples:
*
* ```js
* blobUtil.canvasToBlob(canvas).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* Most browsers support converting a canvas to both `'image/png'` and `'image/jpeg'`. You may
* also want to try `'image/webp'`, which will work in some browsers like Chrome (and in other browsers, will just fall back to `'image/png'`):
*
* ```js
* blobUtil.canvasToBlob(canvas, 'image/webp').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param canvas - HTMLCanvasElement
* @param type - the content type (optional, defaults to 'image/png')
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function canvasToBlob(canvas, type, quality) {
if (typeof canvas.toBlob === 'function') {
return new Promise(function (resolve) {
canvas.toBlob(resolve, type, quality);
});
}
return Promise.resolve(dataURLToBlob(canvas.toDataURL(type, quality)));
}
/**
* Convert an image's `src` URL to a `Blob` by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToBlob('http://mysite.com/img.png').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToBlob('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function imgSrcToBlob(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvasToBlob(canvas, type, quality);
});
}
/**
* Convert an `ArrayBuffer` to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.arrayBufferToBlob(arrayBuff, 'audio/mpeg');
* ```
*
* @param buffer
* @param type - the content type (optional)
* @returns Blob
*/
function arrayBufferToBlob(buffer, type) {
return createBlob([buffer], type);
}
/**
* Convert a `Blob` to an `ArrayBuffer`.
*
* Example:
*
* ```js
* blobUtil.blobToArrayBuffer(blob).then(function (arrayBuff) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the `ArrayBuffer`
*/
function blobToArrayBuffer(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
reader.onloadend = function () {
var result = reader.result || new ArrayBuffer(0);
resolve(result);
};
reader.onerror = reject;
reader.readAsArrayBuffer(blob);
});
}
/**
* Convert an `ArrayBuffer` to a binary string.
*
* Example:
*
* ```js
* var myString = blobUtil.arrayBufferToBinaryString(arrayBuff)
* ```
*
* @param buffer - array buffer
* @returns binary string
*/
function arrayBufferToBinaryString(buffer) {
var binary = '';
var bytes = new Uint8Array(buffer);
var length = bytes.byteLength;
var i = -1;
while (++i < length) {
binary += String.fromCharCode(bytes[i]);
}
return binary;
}
/**
* Convert a binary string to an `ArrayBuffer`.
*
* ```js
* var myBuffer = blobUtil.binaryStringToArrayBuffer(binaryString)
* ```
*
* @param binary - binary string
* @returns array buffer
*/
function binaryStringToArrayBuffer(binary) {
var length = binary.length;
var buf = new ArrayBuffer(length);
var arr = new Uint8Array(buf);
var i = -1;
while (++i < length) {
arr[i] = binary.charCodeAt(i);
}
return buf;
}
exports.createBlob = createBlob;
exports.createObjectURL = createObjectURL;
exports.revokeObjectURL = revokeObjectURL;
exports.blobToBinaryString = blobToBinaryString;
exports.base64StringToBlob = base64StringToBlob;
exports.binaryStringToBlob = binaryStringToBlob;
exports.blobToBase64String = blobToBase64String;
exports.dataURLToBlob = dataURLToBlob;
exports.blobToDataURL = blobToDataURL;
exports.imgSrcToDataURL = imgSrcToDataURL;
exports.canvasToBlob = canvasToBlob;
exports.imgSrcToBlob = imgSrcToBlob;
exports.arrayBufferToBlob = arrayBufferToBlob;
exports.blobToArrayBuffer = blobToArrayBuffer;
exports.arrayBufferToBinaryString = arrayBufferToBinaryString;
exports.binaryStringToArrayBuffer = binaryStringToArrayBuffer;
Object.defineProperty(exports, '__esModule', { value: true });
})));

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!function(e,n){"object"==typeof exports&&"undefined"!=typeof module?n(exports):"function"==typeof define&&define.amd?define(["exports"],n):n(e.blobUtil={})}(this,function(e){"use strict";function n(e,n){return new Promise(function(r,t){var o=new Image;n&&(o.crossOrigin=n),o.onload=function(){r(o)},o.onerror=t,o.src=e})}function r(e){var n=document.createElement("canvas");return n.width=e.width,n.height=e.height,n.getContext("2d").drawImage(e,0,0,e.width,e.height,0,0,e.width,e.height),n}function t(e,n){e=e||[],"string"==typeof(n=n||{})&&(n={type:n});try{return new Blob(e,n)}catch(i){if("TypeError"!==i.name)throw i;for(var r="undefined"!=typeof BlobBuilder?BlobBuilder:"undefined"!=typeof MSBlobBuilder?MSBlobBuilder:"undefined"!=typeof MozBlobBuilder?MozBlobBuilder:WebKitBlobBuilder,t=new r,o=0;o<e.length;o+=1)t.append(e[o]);return t.getBlob(n.type)}}function o(e){return("undefined"!=typeof URL?URL:webkitURL).createObjectURL(e)}function i(e){return("undefined"!=typeof URL?URL:webkitURL).revokeObjectURL(e)}function u(e){return new Promise(function(n,r){var t=new FileReader,o="function"==typeof t.readAsBinaryString;t.onloadend=function(){var e=t.result||"";if(o)return n(e);n(h(e))},t.onerror=r,o?t.readAsBinaryString(e):t.readAsArrayBuffer(e)})}function a(e,n){var r=[p(atob(e))];return n?t(r,{type:n}):t(r)}function f(e,n){return a(btoa(e),n)}function c(e){return u(e).then(btoa)}function d(e){var n=e.match(/data:([^;]+)/)[1],r=e.replace(/^[^,]+,/,"");return t([p(atob(r))],{type:n})}function b(e){return c(e).then(function(n){return"data:"+e.type+";base64,"+n})}function l(e,t,o,i){return t=t||"image/png",n(e,o).then(r).then(function(e){return e.toDataURL(t,i)})}function B(e,n,r){return"function"==typeof e.toBlob?new Promise(function(t){e.toBlob(t,n,r)}):Promise.resolve(d(e.toDataURL(n,r)))}function y(e,t,o,i){return t=t||"image/png",n(e,o).then(r).then(function(e){return B(e,t,i)})}function g(e,n){return t([e],n)}function s(e){return new Promise(function(n,r){var t=new FileReader;t.onloadend=function(){var e=t.result||new ArrayBuffer(0);n(e)},t.onerror=r,t.readAsArrayBuffer(e)})}function h(e){for(var n="",r=new Uint8Array(e),t=r.byteLength,o=-1;++o<t;)n+=String.fromCharCode(r[o]);return n}function p(e){for(var n=e.length,r=new ArrayBuffer(n),t=new Uint8Array(r),o=-1;++o<n;)t[o]=e.charCodeAt(o);return r}e.createBlob=t,e.createObjectURL=o,e.revokeObjectURL=i,e.blobToBinaryString=u,e.base64StringToBlob=a,e.binaryStringToBlob=f,e.blobToBase64String=c,e.dataURLToBlob=d,e.blobToDataURL=b,e.imgSrcToDataURL=l,e.canvasToBlob=B,e.imgSrcToBlob=y,e.arrayBufferToBlob=g,e.blobToArrayBuffer=s,e.arrayBufferToBinaryString=h,e.binaryStringToArrayBuffer=p,Object.defineProperty(e,"__esModule",{value:!0})});

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{
"name": "blob-util",
"version": "2.0.2",
"description": "Utilities for working with Blob objects in the browser",
"main": "dist/blob-util.cjs.js",
"module": "dist/blob-util.es.js",
"types": "dist/blob-util.d.ts",
"repository": {
"type": "git",
"url": "git://github.com/nolanlawson/blob-util.git"
},
"keywords": [
"blob",
"blobs",
"binary",
"util",
"utils"
],
"author": "Nolan Lawson <nolan.lawson@gmail.com>",
"license": "Apache-2.0",
"bugs": {
"url": "https://github.com/nolanlawson/blob-util/issues"
},
"scripts": {
"lint": "standard test/*js bin/*js && tslint src/*ts",
"test": "npm run build && npm run lint && zuul --no-coverage ./test/test.js",
"test-local": "npm run build && zuul ./test/test.js --local 9000 --no-coverage",
"clean": "rimraf dist lib && mkdirp dist lib",
"prepublish": "npm run build",
"build": "run-s clean build-ts build-js min",
"build-ts": "tsc src/blob-util.ts --target ES6 --module es2015 --outDir lib -d && cpy lib/blob-util.d.ts dist/",
"build-js": "run-p build-es build-cjs build-umd && rimraf lib",
"build-es": "rollup -i lib/blob-util.js -f es -o dist/blob-util.es.js",
"build-cjs": "rollup -i lib/blob-util.js -f cjs -o dist/blob-util.cjs.js",
"build-umd": "rollup -i lib/blob-util.js -f umd -n blobUtil -o dist/blob-util.js",
"min": "uglifyjs dist/blob-util.js -mc > dist/blob-util.min.js",
"doc": "run-s cleanup-doc gen-doc gen-readme cleanup-doc",
"gen-doc": "typedoc --out docs-tmp --target ES6 --theme markdown --mdHideSources --excludePrivate --exclude private.ts src",
"gen-readme": "node bin/write-docs-to-readme.js",
"cleanup-doc": "rimraf docs-tmp"
},
"devDependencies": {
"bundle-collapser": "^1.1.4",
"chai": "~1.8.1",
"chai-as-promised": "~4.1.0",
"cpy-cli": "^1.0.1",
"istanbul": "^0.2.7",
"mkdirp": "^0.5.0",
"mocha": "~1.18",
"native-or-lie": "1.0.2",
"npm-run-all": "^4.1.3",
"pify": "^3.0.0",
"request": "^2.36.0",
"rimraf": "^2.6.2",
"rollup": "^0.59.1",
"standard": "^11.0.1",
"tslint": "^5.10.0",
"tslint-config-standard": "^7.0.0",
"typedoc": "^0.11.1",
"typedoc-plugin-markdown": "^1.1.11",
"typescript": "^2.8.3",
"uglify-js": "^2.4.13",
"zuul": "^3.10.1",
"zuul-ngrok": "nolanlawson/zuul-ngrok#patch-1"
},
"files": [
"dist"
]
}