[Lua] Adds some useful encoding APIs for Lua (base64 encoding and decoding and such).

lib/space_lua/stdlib/encoding.ts

@@ -0,0 +1,19 @@
+import { LuaBuiltinFunction, LuaTable } from "../runtime.ts";
+import { base64Decode, base64Encode } from "../../crypto.ts";
+
+export const encodingApi = new LuaTable({
+  base64Encode: new LuaBuiltinFunction(
+    (_sf, s: string | Uint8Array): string => {
+      return base64Encode(s);
+    },
+  ),
+  base64Decode: new LuaBuiltinFunction((_sf, s: string): Uint8Array => {
+    return base64Decode(s);
+  }),
+  utf8Encode: new LuaBuiltinFunction((_sf, s: string): Uint8Array => {
+    return new TextEncoder().encode(s);
+  }),
+  utf8Decode: new LuaBuiltinFunction((_sf, data: Uint8Array): string => {
+    return new TextDecoder().decode(data);
+  }),
+});