func: added save string base64 unicode encoding

Closes #1

src/core/script/saveScript.ts

@@ -6,6 +6,7 @@ import { getCurrentParagraphName, updateParagraph } from "../paragraphs/paragrap
 import { getPlayer, setPlayer, showNameDiv } from "../player/playerInfo";
 import { loadPronounsRadioBtn, showPronouns } from "../player/pronouns";
 import DOMPurify from 'DOMPurify';
+import { b64DecodeUnicode, b64EncodeUnicode } from "../../tools/system";
 
 /**
  * Create a new save and stringify it.
@@ -86,7 +87,7 @@ export function exportStorageSave(saveSlot: string) {
     Copy and keep the code bellow to load later`);
     let saveOutput = document.querySelector(`#saveOutput`);
     (<HTMLInputElement>saveOutput).value = ``; //clear old save
-    (<HTMLInputElement>saveOutput).value = `${btoa(retrievedSave!)}`; //encode to Base64
+    (<HTMLInputElement>saveOutput).value = `${b64EncodeUnicode(retrievedSave!)}`; //encode to Base64
     (<HTMLInputElement>saveOutput).select();
 }
 
@@ -101,7 +102,7 @@ export function exportSave() {
     Copy and keep the code bellow to load later`);
     let saveOutput = document.querySelector(`#saveOutput`);
     (<HTMLInputElement>saveOutput).value = ``; //clear old save
-    (<HTMLInputElement>saveOutput).value += `${btoa(save())}`; //encode to Base64
+    (<HTMLInputElement>saveOutput).value += `${b64EncodeUnicode(save())}`; //encode to Base64
     (<HTMLInputElement>saveOutput).select();
 }
 
@@ -111,7 +112,7 @@ export function exportSave() {
  */
 export function loadSaveCode() {
     let loadCode = (<HTMLInputElement>document.querySelector("#saveOutput")).value;
-    loadCode = atob(loadCode);
+    loadCode = b64DecodeUnicode(loadCode);
     console.log(loadCode);
     let retrievedSave = JSON.parse(loadCode);
     console.log(retrievedSave)

src/tools/system.ts

@@ -0,0 +1,21 @@
+/**
+ * Encode unicode string to base64
+ * @param str string to be encoded
+ * @returns encoded string
+ */
+export function b64EncodeUnicode(str: string) {
+    return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function(match, p1) {
+        return String.fromCharCode(parseInt(p1, 16))
+    }))
+}
+
+/**
+ * Decode unicode base64 string
+ * @param str base64 string to be decoded
+ * @returns decoded string
+ */
+export function b64DecodeUnicode(str: string) {
+    return decodeURIComponent(Array.prototype.map.call(atob(str), function(c) {
+        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
+    }).join(''))
+}