Add default icon preference

webext/js/options_iconform.js

@@ -1,3 +1,34 @@
+function fileSelectedDefault() {
+  const input = document.getElementById("selectedFileDefaultIconType");
+
+  //  if (input.files.length > 0) {
+  //    console.debug("Selected file: " + input.files[0].name);
+  //    console.debug("Selected file type: " + input.files[0].type);
+  //  }
+
+  function storeFile() {
+    const buffer = new Uint8Array(fr.result);
+
+    let binary = "";
+    const len = buffer.byteLength;
+    for (let i = 0; i < len; i++) {
+      binary += String.fromCharCode(buffer[i]);
+    }
+
+    const base64 = window.btoa(binary);
+    const iconDiv = document.getElementById("defaultIcon");
+    iconDiv.setAttribute("data-default-icon", base64);
+    iconDiv.setAttribute("data-default-icon-mime", input.files[0].type);
+
+    const image = document.getElementById("defaultCustomIconImage");
+    image.setAttribute("src", `data:${input.files[0].type};base64,${base64}`);
+  }
+
+  fr = new FileReader();
+  fr.onload = storeFile;
+  fr.readAsArrayBuffer(input.files[0]);
+}
+
 function fileSelected() {
   const input = document.getElementById("selectedFileIconType");
 
@@ -32,3 +63,7 @@ function fileSelected() {
 document
   .getElementById("selectedFileIconType")
   .addEventListener("change", fileSelected);
+
+document
+  .getElementById("selectedFileDefaultIconType")
+  .addEventListener("change", fileSelectedDefault);