1 files changed, 55 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/content-encoding/gzip/big-gzip-body.https.any.js b/testing/web-platform/tests/fetch/content-encoding/gzip/big-gzip-body.https.any.js
new file mode 100644
index 0000000000..b5d62c9804
--- /dev/null
+++ b/testing/web-platform/tests/fetch/content-encoding/gzip/big-gzip-body.https.any.js
@@ -0,0 +1,55 @@
+// META: global=window,worker
+
+const EXPECTED_SIZE = 27000000;
+const EXPECTED_SHA256 = [
+    74,  100, 37, 243, 147, 61,  116, 60,  241, 221, 126,
+    18,  24,  71, 204, 28,  50,  62,  201, 130, 152, 225,
+    217, 183, 10, 201, 143, 214, 102, 155, 212, 248,
+  ];
+
+promise_test(async () => {
+  const response = await fetch('resources/big.text.gz');
+  assert_true(response.ok);
+  const arrayBuffer = await response.arrayBuffer();
+  assert_equals(arrayBuffer.byteLength, EXPECTED_SIZE,
+               'uncompressed size should match');
+  const sha256 = await crypto.subtle.digest('SHA-256', arrayBuffer);
+  assert_array_equals(new Uint8Array(sha256), EXPECTED_SHA256,
+                      'digest should match');
+}, 'large gzip data should be decompressed successfully');
+
+promise_test(async () => {
+  const response = await fetch('resources/big.text.gz');
+  assert_true(response.ok);
+  const reader = response.body.getReader({mode: 'byob'});
+  let offset = 0;
+  // Pre-allocate space for the output. The response body will be read
+  // chunk-by-chunk into this array.
+  let ab = new ArrayBuffer(EXPECTED_SIZE);
+  while (offset < EXPECTED_SIZE) {
+    // To stress the data pipe, we want to use a different size read each
+    // time. Unfortunately, JavaScript doesn't have a seeded random number
+    // generator, so this creates the possibility of making this test flaky if
+    // it doesn't work for some edge cases.
+    let size = Math.floor(Math.random() * 65535 + 1);
+    if (size + offset > EXPECTED_SIZE) {
+      size = EXPECTED_SIZE - offset;
+    }
+    const u8 = new Uint8Array(ab, offset, size);
+    const { value, done } = await reader.read(u8);
+    ab = value.buffer;
+    // Check that we got our original array back.
+    assert_equals(ab.byteLength, EXPECTED_SIZE,
+                  'backing array should be the same size');
+    assert_equals(offset, value.byteOffset, 'offset should match');
+    assert_less_than_equal(value.byteLength, size,
+                           'we should not have got more than we asked for');
+    offset = value.byteOffset + value.byteLength;
+    if (done) break;
+  }
+  assert_equals(offset, EXPECTED_SIZE,
+                'we should have read the whole thing');
+  const sha256 = await crypto.subtle.digest('SHA-256', new Uint8Array(ab));
+  assert_array_equals(new Uint8Array(sha256), EXPECTED_SHA256,
+                      'digest should match');
+}, 'large gzip data should be decompressed successfully with byte stream');