upload_sdk/utils.js

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = getFilemd5sum;

var _sparkMd = require('spark-md5');

var _sparkMd2 = _interopRequireDefault(_sparkMd);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function getFilemd5sum(ofile) {
    return new Promise(function (resolve, reject) {
        var file = ofile;
        var tmp_md5 = void 0;
        var blobSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice,

        // file = this.files[0],
        chunkSize = 8097152,
            // Read in chunks of 2MB
        chunks = Math.ceil(file.size / chunkSize),
            currentChunk = 0,
            spark = new _sparkMd2.default.ArrayBuffer(),
            fileReader = new FileReader();

        function loadNext() {
            var start = currentChunk * chunkSize,
                end = start + chunkSize >= file.size ? file.size : start + chunkSize;
            fileReader.readAsArrayBuffer(blobSlice.call(file, start, end));
        }

        fileReader.onload = function (e) {
            spark.append(e.target.result); // Append array buffer
            currentChunk++;

            if (currentChunk < chunks) {
                loadNext();
            } else {
                tmp_md5 = spark.end();
                resolve(tmp_md5);
            }
        };

        fileReader.onerror = function () {
            reject('error');
        };

        loadNext();
    });
}