base64-to-buffer.js

/*
 *
 * Just a copy/pasted function
 * to save base64 encoded data to a buffer
 * http://stackoverflow.com/questions/16245767/creating-a-blob-from-a-base64-string-in-javascript
 *
 */
angular.module('eha.biometricregistration')
  .factory('base64ToBuffer', function($window) {
    return function b64toBlob(b64Data, contentType, sliceSize) {
      contentType = contentType || '';
      sliceSize = sliceSize || 512;

      var byteCharacters = atob(b64Data);
      var byteArrays = [];

      for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
        var slice = byteCharacters.slice(offset, offset + sliceSize);

        var byteNumbers = new Array(slice.length);
        for (var i = 0; i < slice.length; i++) {
            byteNumbers[i] = slice.charCodeAt(i);
        }

        var byteArray = new Uint8Array(byteNumbers);
        byteArrays.push(byteArray);
      }

      var blob = new Blob(byteArrays, {type: contentType});
      return blob;
    };
  });