Make `buffer.toString("base64")` 4x faster (#3486)

* Add libbase64

* Add bench

* Update licensing.md

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/bench/snippets/base64-buffer-to-string.mjs b/bench/snippets/base64-buffer-to-string.mjs
new file mode 100644
index 000000000..a62b76379
--- /dev/null
+++ b/bench/snippets/base64-buffer-to-string.mjs
@@ -0,0 +1,14 @@
+import { bench, run } from "./runner.mjs";
+import { Buffer } from "node:buffer";
+
+const bigBuffer = Buffer.from("hello world".repeat(10000));
+const converted = bigBuffer.toString("base64");
+bench("Buffer.toString('base64')", () => {
+  return bigBuffer.toString("base64");
+});
+
+// bench("Buffer.from(str, 'base64')", () => {
+//   return Buffer.from(converted, "base64");
+// });
+
+await run();