Greasemonkey issue #2376: GM_getResourceText - binary (backward compatible)

greasemonkey_issue_2376.user.js

// ==UserScript==
// @name        Greasemonkey - issue - 2376
// @include     https://en.wikipedia.org/wiki/Portal:Biography
// @resource    image https://assets-cdn.github.com/images/modules/home/desktop-windows.png?v=1
// @grant       GM_getResourceText
// ==/UserScript==

if (document.getElementsByTagName("body")[0]) {
  var body = document.getElementsByTagName("body")[0];

  var resourceName = "image";
  var textareaElementName = "textarea";
  var textareaRows = "20";

  // arraybuffer
  var contentTypeArraybuffer = "arraybuffer";
  var textareaArraybuffer = document.createElement(textareaElementName);
  textareaArraybuffer.rows = textareaRows;
  textareaArraybuffer.title = contentTypeArraybuffer;
  var arraybuffer = GM_getResourceText(resourceName, contentTypeArraybuffer);
  var dataArraybuffer = "";
  try {
    var dataViewArraybuffer = new Uint8Array(arraybuffer);
    for (var i = 0, count = dataViewArraybuffer.byteLength; i < count; i++) {
      dataArraybuffer += String.fromCharCode(dataViewArraybuffer[i]);
    }
    textareaArraybuffer.value = btoa(dataArraybuffer);
    body.appendChild(textareaArraybuffer);
  } catch (e) {
    console.log(GM_info.script.localizedName + " (" + contentTypeArraybuffer + "): " + e);
  }

  // blob
  var contentTypeBlob = "blob";
  var typeBlob = "image/png";
  var textareaBlob = document.createElement(textareaElementName);
  textareaBlob.rows = textareaRows;
  textareaBlob.title = contentTypeBlob;
  var blob = GM_getResourceText(resourceName, contentTypeBlob);
  var reader = new FileReader();
  reader.readAsDataURL(new Blob([blob], {"type": typeBlob})); 
  reader.onloadend = function () {
    textareaBlob.value = reader.result;                
    body.appendChild(textareaBlob);
  }  
}