fix(node:zlib): gzip & gzipSync should accept ArrayBuffer (denoland#26762)

Closes denoland#26638

Author: satyarohith

ext/node/polyfills/_zlib.mjs

@@ -14,6 +14,7 @@ import { nextTick } from "ext:deno_node/_next_tick.ts";
 import {
   isAnyArrayBuffer,
   isArrayBufferView,
+  isUint8Array,
 } from "ext:deno_node/internal/util/types.ts";
 
 var kRangeErrorMessage = "Cannot create final Buffer. It would be larger " +
@@ -158,6 +159,12 @@ export const inflateRawSync = function (buffer, opts) {
 function sanitizeInput(input) {
   if (typeof input === "string") input = Buffer.from(input);
 
+  if (isArrayBufferView(input) && !isUint8Array(input)) {
+    input = Buffer.from(input.buffer, input.byteOffset, input.byteLength);
+  } else if (isAnyArrayBuffer(input)) {
+    input = Buffer.from(input);
+  }
+
   if (
     !Buffer.isBuffer(input) &&
     (input.buffer && !input.buffer.constructor === ArrayBuffer)

tests/unit_node/zlib_test.ts

@@ -10,6 +10,7 @@ import {
   createBrotliCompress,
   createBrotliDecompress,
   createDeflate,
+  gzip,
   gzipSync,
   unzipSync,
 } from "node:zlib";
@@ -210,3 +211,17 @@ Deno.test("createBrotliCompress params", async () => {
   );
   assertEquals(output.length, input.length);
 });
+
+Deno.test("gzip() and gzipSync() accept ArrayBuffer", async () => {
+  const deffered = Promise.withResolvers<void>();
+  const buf = new ArrayBuffer(0);
+  let output: Buffer;
+  gzip(buf, (_err, data) => {
+    output = data;
+    deffered.resolve();
+  });
+  await deffered.promise;
+  assert(output! instanceof Buffer);
+  const outputSync = gzipSync(buf);
+  assert(outputSync instanceof Buffer);
+});