Add tests for TS brotli decoder

PiperOrigin-RevId: 527326003

js/bundle_test.js

@@ -15,8 +15,8 @@ const CRC_64_POLY = new Uint32Array([0xD7870F42, 0xC96C5795]);
  * @return {string} footprint
  */
 function calculateCrc64(data) {
-  let crc = new Uint32Array([0xFFFFFFFF, 0xFFFFFFFF]);
-  let c = new Uint32Array(2);
+  const crc = new Uint32Array([0xFFFFFFFF, 0xFFFFFFFF]);
+  const c = new Uint32Array(2);
   for (let i = 0; i < data.length; ++i) {
     c[1] = 0;
     c[0] = (crc[0] ^ data[i]) & 0xFF;
@@ -58,7 +58,7 @@ function checkEntry(entry, data) {
 
 describe("BundleTest", () => {
   const testData = makeTestData();
-  for (let entry in testData) {
+  for (const entry in testData) {
     if (!testData.hasOwnProperty(entry)) {
       continue;
     }

js/bundle_test.ts

@@ -0,0 +1,63 @@
+/* Copyright 2023 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+import {brotliDecode} from "./decode";
+import {makeTestData} from "./test_data";
+
+const CRC_64_POLY = new Uint32Array([0xD7870F42, 0xC96C5795]);
+
+/**
+ * Calculates binary data footprint.
+ */
+function calculateCrc64(data: Int8Array): string {
+  const crc = new Uint32Array([0xFFFFFFFF, 0xFFFFFFFF]);
+  const c = new Uint32Array(2);
+  for (let i = 0; i < data.length; ++i) {
+    c[1] = 0;
+    c[0] = (crc[0] ^ data[i]) & 0xFF;
+    for (let k = 0; k < 8; ++k) {
+      const isOdd = c[0] & 1;
+      c[0] = (c[0] >>> 1) | ((c[1] & 1) << 31);
+      c[1] = c[1] >>> 1;
+      if (isOdd) {
+        c[0] = c[0] ^ CRC_64_POLY[0];
+        c[1] = c[1] ^ CRC_64_POLY[1];
+      }
+    }
+    crc[0] = ((crc[0] >>> 8) | ((crc[1] & 0xFF) << 24)) ^ c[0];
+    crc[1] = (crc[1] >>> 8) ^ c[1];
+  }
+  crc[0] = ~crc[0];
+  crc[1] = ~crc[1];
+
+  let lo = crc[0].toString(16);
+  lo = "0".repeat(8 - lo.length) + lo;
+  let hi = crc[1].toString(16);
+  hi = "0".repeat(8 - hi.length) + hi;
+
+  return hi + lo;
+}
+
+/**
+ * Decompresses data and checks that output footprint is correct.
+ */
+function checkEntry(entry: string, data: Int8Array) {
+  const expectedCrc = entry.substring(0, 16);
+  const decompressed = brotliDecode(data);
+  const crc = calculateCrc64(decompressed);
+  expect(expectedCrc).toEqual(crc);
+}
+
+describe("BundleTest", () => {
+  const testData = makeTestData();
+  for (const entry in testData) {
+    if (!testData.hasOwnProperty(entry)) {
+      continue;
+    }
+    const name = entry.substring(17);
+    const data = testData[entry];
+    it('test_' + name, checkEntry.bind(null, entry, data));
+  }
+});