buffer: add .bytes() method to Blob

PR-URL: #53221
Reviewed-By: Yagiz Nizipli <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Filip Skokan <[email protected]>

Author: KhafraDev

lib/internal/blob.js

@@ -7,6 +7,7 @@ const {
   ObjectDefineProperties,
   ObjectDefineProperty,
   ObjectSetPrototypeOf,
+  PromisePrototypeThen,
   PromiseReject,
   RegExpPrototypeExec,
   RegExpPrototypeSymbolReplace,
@@ -311,6 +312,15 @@ class Blob {
     return dec.decode(await this.arrayBuffer());
   }
 
+  bytes() {
+    if (!isBlob(this))
+      throw new ERR_INVALID_THIS('Blob');
+
+    return PromisePrototypeThen(
+      this.arrayBuffer(),
+      (buffer) => new Uint8Array(buffer));
+  }
+
   /**
    * @returns {ReadableStream}
    */

test/fixtures/wpt/FileAPI/Blob-methods-from-detached-frame.html

@@ -27,6 +27,7 @@
 
     assert_equals(await slicedBlob.text(), "oo");
     assert_equals(charCodeBufferToString(await slicedBlob.arrayBuffer()), "oo");
+    assert_equals(charCodeArrayToString(await slicedBlob.bytes()), "oo");
 
     const reader = slicedBlob.stream().getReader();
     const { value } = await reader.read();
@@ -48,6 +49,14 @@
     assert_equals(charCodeBufferToString(charCodeBuffer), "bar");
 }, "arrayBuffer()");
 
+promise_test(async () => {
+    const { bytes } = await BlobPrototypeFromDetachedFramePromise;
+    const blob = new Blob(["bar"]);
+
+    const charCodeBytes = await bytes.call(blob);
+    assert_equals(charCodeArrayToString(charCodeBytes), "bar");
+}, "bytes()");
+
 promise_test(async () => {
     const { stream } = await BlobPrototypeFromDetachedFramePromise;
     const blob = new Blob(["baz"]);

test/fixtures/wpt/FileAPI/META.yml

@@ -1,6 +1,6 @@
 spec: https://w3c.github.io/FileAPI/
 suggested_reviewers:
   - inexorabletash
-  - zqzhang
   - jdm
   - mkruisselbrink
+  - annevk

test/fixtures/wpt/FileAPI/blob/Blob-bytes.any.js

@@ -0,0 +1,45 @@
+// META: title=Blob bytes()
+// META: script=../support/Blob.js
+'use strict';
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("PASS");
+  const blob = new Blob([input_arr]);
+  const uint8array = await blob.bytes();
+  assert_true(uint8array instanceof Uint8Array);
+  assert_equals_typed_array(uint8array, input_arr);
+}, "Blob.bytes()")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("");
+  const blob = new Blob([input_arr]);
+  const uint8array = await blob.bytes();
+  assert_true(uint8array instanceof Uint8Array);
+  assert_equals_typed_array(uint8array, input_arr);
+}, "Blob.bytes() empty Blob data")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("\u08B8\u000a");
+  const blob = new Blob([input_arr]);
+  const uint8array = await blob.bytes();
+  assert_equals_typed_array(uint8array, input_arr);
+}, "Blob.bytes() non-ascii input")
+
+promise_test(async () => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  const blob = new Blob([typed_arr]);
+  const uint8array = await blob.bytes();
+  assert_equals_typed_array(uint8array, typed_arr);
+}, "Blob.bytes() non-unicode input")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("PASS");
+  const blob = new Blob([input_arr]);
+  const uint8array_results = await Promise.all([blob.bytes(),
+      blob.bytes(), blob.bytes()]);
+  for (let uint8array of uint8array_results) {
+    assert_true(uint8array instanceof Uint8Array);
+    assert_equals_typed_array(uint8array, input_arr);
+  }
+}, "Blob.bytes() concurrent reads")

test/fixtures/wpt/FileAPI/blob/Blob-constructor.any.js

@@ -290,10 +290,11 @@ test_blob(function() {
     new Int16Array([0x4150, 0x5353]),
     new Uint32Array([0x53534150]),
     new Int32Array([0x53534150]),
+    new Float16Array([2.65625, 58.59375]),
     new Float32Array([0xD341500000])
   ]);
 }, {
-  expected: "PASSPASSPASSPASSPASSPASSPASS",
+  expected: "PASSPASSPASSPASSPASSPASSPASSPASS",
   type: "",
   desc: "Passing typed arrays as elements of the blobParts array should work."
 });

test/fixtures/wpt/FileAPI/blob/Blob-stream.any.js

@@ -70,7 +70,18 @@ promise_test(async() => {
   await garbageCollect();
   const chunks = await read_all_chunks(stream, { perform_gc: true });
   assert_array_equals(chunks, input_arr);
-}, "Blob.stream() garbage collection of blob shouldn't break stream" +
+}, "Blob.stream() garbage collection of blob shouldn't break stream " +
+      "consumption")
+
+promise_test(async() => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  let blob = new Blob([typed_arr]);
+  const chunksPromise = read_all_chunks(blob.stream());
+  // It somehow matters to do GC here instead of doing `perform_gc: true`
+  await garbageCollect();
+  assert_array_equals(await chunksPromise, input_arr);
+}, "Blob.stream() garbage collection of stream shouldn't break stream " +
       "consumption")
 
 promise_test(async () => {

test/fixtures/wpt/README.md

@@ -17,7 +17,7 @@ Last update:
 - dom/events: https://github.com/web-platform-tests/wpt/tree/ab8999891c/dom/events
 - encoding: https://github.com/web-platform-tests/wpt/tree/a58bbf6d8c/encoding
 - fetch/data-urls/resources: https://github.com/web-platform-tests/wpt/tree/7c79d998ff/fetch/data-urls/resources
-- FileAPI: https://github.com/web-platform-tests/wpt/tree/e36dbb6f00/FileAPI
+- FileAPI: https://github.com/web-platform-tests/wpt/tree/cceaf3628d/FileAPI
 - hr-time: https://github.com/web-platform-tests/wpt/tree/34cafd797e/hr-time
 - html/webappapis/atob: https://github.com/web-platform-tests/wpt/tree/f267e1dca6/html/webappapis/atob
 - html/webappapis/microtask-queuing: https://github.com/web-platform-tests/wpt/tree/2c5c3c4c27/html/webappapis/microtask-queuing

test/fixtures/wpt/versions.json

@@ -28,7 +28,7 @@
     "path": "fetch/data-urls/resources"
   },
   "FileAPI": {
-    "commit": "e36dbb6f00fb59f9fc792f509194432e9e6d0b6d",
+    "commit": "cceaf3628da950621004d9b5d8c1d1f367073347",
     "path": "FileAPI"
   },
   "hr-time": {