Initial commit of 001code-html Scratch frontend project.

Includes scratch-gui, scratch-vm, scratch-blocks, scratch-render, scratch-l10n, and deployment config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scratch-vm/test/unit/util_base64.js

@@ -0,0 +1,41 @@
+const test = require('tap').test;
+const Base64Util = require('../../src/util/base64-util');
+
+test('uint8ArrayToBase64', t => {
+    t.equal(Base64Util.uint8ArrayToBase64(new Uint8Array([0, 50, 80, 200])), 'ADJQyA==');
+    t.equal(Base64Util.uint8ArrayToBase64([0, 50, 80, 200]), 'ADJQyA==');
+    t.end();
+});
+
+test('arrayBufferToBase64', t => {
+    t.equal(Base64Util.arrayBufferToBase64(new Uint8Array([0, 50, 80, 200]).buffer), 'ADJQyA==');
+    t.end();
+});
+
+test('base64ToUint8Array', t => {
+    t.same(Base64Util.base64ToUint8Array('ADJQyA=='), new Uint8Array([0, 50, 80, 200]));
+    t.end();
+});
+
+test('round trips', t => {
+    const data = [
+        new Uint8Array(new Array(255)
+            .fill()
+            .map((_, index) => index)
+        ),
+        new Uint8Array(0),
+        new Uint8Array([10, 90, 0, 255, 255, 255, 10, 2]),
+        new Uint8Array(10000),
+        new Uint8Array(100000)
+    ];
+    for (const uint8array of data) {
+        const uint8ToBase64 = Base64Util.uint8ArrayToBase64(uint8array);
+        const arrayToBase64 = Base64Util.uint8ArrayToBase64(Array.from(uint8array));
+        const bufferToBase64 = Base64Util.arrayBufferToBase64(uint8array.buffer);
+        t.equal(uint8ToBase64, arrayToBase64);
+        t.equal(uint8ToBase64, bufferToBase64);
+        const decoded = Base64Util.base64ToUint8Array(uint8ToBase64);
+        t.same(uint8array, decoded);
+    }
+    t.end();
+});