mirror of
https://github.com/snipe/snipe-it.git
synced 2024-11-11 08:04:09 -08:00
112 lines
3.5 KiB
JavaScript
112 lines
3.5 KiB
JavaScript
/*
|
|
* JavaScript Canvas to Blob
|
|
* https://github.com/blueimp/JavaScript-Canvas-to-Blob
|
|
*
|
|
* Copyright 2012, Sebastian Tschan
|
|
* https://blueimp.net
|
|
*
|
|
* Licensed under the MIT license:
|
|
* http://www.opensource.org/licenses/MIT
|
|
*
|
|
* Based on stackoverflow user Stoive's code snippet:
|
|
* http://stackoverflow.com/q/4998908
|
|
*/
|
|
|
|
/* global atob, Blob, define */
|
|
|
|
;(function (window) {
|
|
'use strict'
|
|
|
|
var CanvasPrototype = window.HTMLCanvasElement &&
|
|
window.HTMLCanvasElement.prototype
|
|
var hasBlobConstructor = window.Blob && (function () {
|
|
try {
|
|
return Boolean(new Blob())
|
|
} catch (e) {
|
|
return false
|
|
}
|
|
}())
|
|
var hasArrayBufferViewSupport = hasBlobConstructor && window.Uint8Array &&
|
|
(function () {
|
|
try {
|
|
return new Blob([new Uint8Array(100)]).size === 100
|
|
} catch (e) {
|
|
return false
|
|
}
|
|
}())
|
|
var BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder ||
|
|
window.MozBlobBuilder || window.MSBlobBuilder
|
|
var dataURIPattern = /^data:((.*?)(;charset=.*?)?)(;base64)?,/
|
|
var dataURLtoBlob = (hasBlobConstructor || BlobBuilder) && window.atob &&
|
|
window.ArrayBuffer && window.Uint8Array &&
|
|
function (dataURI) {
|
|
var matches,
|
|
mediaType,
|
|
isBase64,
|
|
dataString,
|
|
byteString,
|
|
arrayBuffer,
|
|
intArray,
|
|
i,
|
|
bb
|
|
// Parse the dataURI components as per RFC 2397
|
|
matches = dataURI.match(dataURIPattern)
|
|
if (!matches) {
|
|
throw new Error('invalid data URI')
|
|
}
|
|
// Default to text/plain;charset=US-ASCII
|
|
mediaType = matches[2]
|
|
? matches[1]
|
|
: 'text/plain' + (matches[3] || ';charset=US-ASCII')
|
|
isBase64 = !!matches[4]
|
|
dataString = dataURI.slice(matches[0].length)
|
|
if (isBase64) {
|
|
// Convert base64 to raw binary data held in a string:
|
|
byteString = atob(dataString)
|
|
} else {
|
|
// Convert base64/URLEncoded data component to raw binary:
|
|
byteString = decodeURIComponent(dataString)
|
|
}
|
|
// Write the bytes of the string to an ArrayBuffer:
|
|
arrayBuffer = new ArrayBuffer(byteString.length)
|
|
intArray = new Uint8Array(arrayBuffer)
|
|
for (i = 0; i < byteString.length; i += 1) {
|
|
intArray[i] = byteString.charCodeAt(i)
|
|
}
|
|
// Write the ArrayBuffer (or ArrayBufferView) to a blob:
|
|
if (hasBlobConstructor) {
|
|
return new Blob(
|
|
[hasArrayBufferViewSupport ? intArray : arrayBuffer],
|
|
{type: mediaType}
|
|
)
|
|
}
|
|
bb = new BlobBuilder()
|
|
bb.append(arrayBuffer)
|
|
return bb.getBlob(mediaType)
|
|
}
|
|
if (window.HTMLCanvasElement && !CanvasPrototype.toBlob) {
|
|
if (CanvasPrototype.mozGetAsFile) {
|
|
CanvasPrototype.toBlob = function (callback, type, quality) {
|
|
if (quality && CanvasPrototype.toDataURL && dataURLtoBlob) {
|
|
callback(dataURLtoBlob(this.toDataURL(type, quality)))
|
|
} else {
|
|
callback(this.mozGetAsFile('blob', type))
|
|
}
|
|
}
|
|
} else if (CanvasPrototype.toDataURL && dataURLtoBlob) {
|
|
CanvasPrototype.toBlob = function (callback, type, quality) {
|
|
callback(dataURLtoBlob(this.toDataURL(type, quality)))
|
|
}
|
|
}
|
|
}
|
|
if (typeof define === 'function' && define.amd) {
|
|
define(function () {
|
|
return dataURLtoBlob
|
|
})
|
|
} else if (typeof module === 'object' && module.exports) {
|
|
module.exports = dataURLtoBlob
|
|
} else {
|
|
window.dataURLtoBlob = dataURLtoBlob
|
|
}
|
|
}(window))
|