Enqueue the decode result even if stream end is met

This corresponds to the not-merged-yet spec PR: whatwg/compression#77

Differential Revision: https://phabricator.services.mozilla.com/D266433

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1990921
gecko-commit: 86cb8e42ea52ae9f19fd1edb128d9abf2bb009d3
gecko-reviewers: smaug

Author: saschanaz

compression/decompression-correct-input.tentative.any.js renamed to compression/decompression-correct-input.any.js

@@ -1,15 +1,8 @@
 // META: global=window,worker,shadowrealm
+// META: script=decompression-correct-input.js
 
 'use strict';
 
-const deflateChunkValue = new Uint8Array([120, 156, 75, 173, 40, 72, 77, 46, 73, 77, 81, 200, 47, 45, 41, 40, 45, 1, 0, 48, 173, 6, 36]);
-const gzipChunkValue = new Uint8Array([31, 139, 8, 0, 0, 0, 0, 0, 0, 3, 75, 173, 40, 72, 77, 46, 73, 77, 81, 200, 47, 45, 41, 40, 45, 1, 0, 176, 1, 57, 179, 15, 0, 0, 0]);
-const deflateRawChunkValue = new Uint8Array([
-    0x4b, 0xad, 0x28, 0x48, 0x4d, 0x2e, 0x49, 0x4d, 0x51, 0xc8,
-    0x2f, 0x2d, 0x29, 0x28, 0x2d, 0x01, 0x00,
-]);
-const trueChunkValue = new TextEncoder().encode('expected output');
-
 promise_test(async t => {
     const ds = new DecompressionStream('deflate');
     const reader = ds.readable.getReader();
@@ -19,7 +12,6 @@ promise_test(async t => {
     assert_array_equals(Array.from(value), trueChunkValue, "value should match");
 }, 'decompressing deflated input should work');
 
-
 promise_test(async t => {
     const ds = new DecompressionStream('gzip');
     const reader = ds.readable.getReader();

compression/decompression-correct-input.js

@@ -0,0 +1,7 @@
+const deflateChunkValue = new Uint8Array([120, 156, 75, 173, 40, 72, 77, 46, 73, 77, 81, 200, 47, 45, 41, 40, 45, 1, 0, 48, 173, 6, 36]);
+const gzipChunkValue = new Uint8Array([31, 139, 8, 0, 0, 0, 0, 0, 0, 3, 75, 173, 40, 72, 77, 46, 73, 77, 81, 200, 47, 45, 41, 40, 45, 1, 0, 176, 1, 57, 179, 15, 0, 0, 0]);
+const deflateRawChunkValue = new Uint8Array([
+    0x4b, 0xad, 0x28, 0x48, 0x4d, 0x2e, 0x49, 0x4d, 0x51, 0xc8,
+    0x2f, 0x2d, 0x29, 0x28, 0x2d, 0x01, 0x00,
+]);
+const trueChunkValue = new TextEncoder().encode('expected output');

compression/decompression-extra-input.any.js

@@ -0,0 +1,22 @@
+// META: global=window,worker,shadowrealm
+// META: script=decompression-correct-input.js
+
+'use strict';
+
+const tests = [
+  ["deflate", new Uint8Array([...deflateChunkValue, 0])],
+  ["gzip", new Uint8Array([...gzipChunkValue, 0])],
+  ["deflate-raw", new Uint8Array([...deflateRawChunkValue, 0])],
+];
+
+for (const [format, chunk] of tests) {
+  promise_test(async t => {
+    const ds = new DecompressionStream(format);
+    const reader = ds.readable.getReader();
+    const writer = ds.writable.getWriter();
+    writer.write(chunk).catch(() => { });
+    const { done, value } = await reader.read();
+    assert_array_equals(Array.from(value), trueChunkValue, "value should match");
+    await promise_rejects_js(t, TypeError, reader.read(), "Extra input should eventually throw");
+  }, `decompressing ${format} input with extra pad should still give the output`);
+}