Closes #2; Fix TextEncoder error

Helpers/script.js

@@ -1,5 +1,80 @@
 const KNOWN_DYNAMIC_FUNC = ['ulns', 'cwkfcplc', 'dnvffnze', 'kgaitijd', 'polorucp'];
 
+function TextEncoder() {
+}
+
+TextEncoder.prototype.encode = function (string) {
+  var octets = [];
+  var length = string.length;
+  var i = 0;
+  while (i < length) {
+    var codePoint = string.codePointAt(i);
+    var c = 0;
+    var bits = 0;
+    if (codePoint <= 0x0000007F) {
+      c = 0;
+      bits = 0x00;
+    } else if (codePoint <= 0x000007FF) {
+      c = 6;
+      bits = 0xC0;
+    } else if (codePoint <= 0x0000FFFF) {
+      c = 12;
+      bits = 0xE0;
+    } else if (codePoint <= 0x001FFFFF) {
+      c = 18;
+      bits = 0xF0;
+    }
+    octets.push(bits | (codePoint >> c));
+    c -= 6;
+    while (c >= 0) {
+      octets.push(0x80 | ((codePoint >> c) & 0x3F));
+      c -= 6;
+    }
+    i += codePoint >= 0x10000 ? 2 : 1;
+  }
+  return octets;
+}
+
+function TextDecoder() {
+}
+
+TextDecoder.prototype.decode = function (octets) {
+  var string = "";
+  var i = 0;
+  while (i < octets.length) {
+    var octet = octets[i];
+    var bytesNeeded = 0;
+    var codePoint = 0;
+    if (octet <= 0x7F) {
+      bytesNeeded = 0;
+      codePoint = octet & 0xFF;
+    } else if (octet <= 0xDF) {
+      bytesNeeded = 1;
+      codePoint = octet & 0x1F;
+    } else if (octet <= 0xEF) {
+      bytesNeeded = 2;
+      codePoint = octet & 0x0F;
+    } else if (octet <= 0xF4) {
+      bytesNeeded = 3;
+      codePoint = octet & 0x07;
+    }
+    if (octets.length - i - bytesNeeded > 0) {
+      var k = 0;
+      while (k < bytesNeeded) {
+        octet = octets[i + k + 1];
+        codePoint = (codePoint << 6) | (octet & 0x3F);
+        k += 1;
+      }
+    } else {
+      codePoint = 0xFFFD;
+      bytesNeeded = octets.length - i;
+    }
+    string += String.fromCodePoint(codePoint);
+    i += bytesNeeded + 1;
+  }
+  return string
+}
+
 function containsLib(library){
     return Process.getModuleByName(library);
 }
@@ -862,4 +937,4 @@ const OEMCrypto_LicenseType = {
 
 rpc.exports.inject = inject;
 
-rpc.exports.widevinelibrary = containsLib;
+rpc.exports.widevinelibrary = containsLib;