Update codecs.js (#167)

Even faster xor functions by about 2.1x in testing, same output as before so no breaking changes but it could be even faster if it wasent forced to be the same output:

> https://gist.github.com/theogbob/89bfd228d7ec646bac14db867f33b8b2

src/rewrite/codecs.js

@@ -21,23 +21,25 @@ export const plain = {
 export const xor = {
 	encode(str) {
 		if (!str) return str;
-		let result = "";
-		for (let i = 0; i < str.length; i++) {
-			result += i % 2 ? String.fromCharCode(str.charCodeAt(i) ^ 2) : str[i];
-		}
-		return encodeURIComponent(result);
+	        let result = "";
+	        let len = str.length;
+	        for (let i = 0; i < len; i++) {
+	            const char = str[i];
+	            result += i % 2 ? String.fromCharCode(char.charCodeAt(0) ^ 2) : char;
+	        }
+	        return encodeURIComponent(result);
 	},
 	decode(str) {
-		if (!str) return str;
-		const [input, ...search] = str.split("?");
-		let result = "";
-		const decoded = decodeURIComponent(input);
-		for (let i = 0; i < decoded.length; i++) {
-			result +=
-				i % 2 ? String.fromCharCode(decoded.charCodeAt(i) ^ 2) : decoded[i];
-		}
-		return result + (search.length ? "?" + search.join("?") : "");
-	},
+	        if (!str) return str;
+	        str = decodeURIComponent(str);
+	        let result = "";
+	        let len = str.length;
+	        for (let i = 0; i < len; i++) {
+	            const char = str[i];
+	            result += i % 2 ? String.fromCharCode(char.charCodeAt(0) ^ 2) : char;
+	        }
+		return result;
+	}
 };
 
 export const base64 = {