rc-cropping/lib/canvasToBlob.js

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
/*
 * 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 */
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)));
        };
    }
}
exports["default"] = dataURLtoBlob;
module.exports = exports['default'];