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// META: global=window,worker,shadowrealm
// META: script=resources/concatenate-stream.js
'use strict';
const kInputLength = 1000000;
async function createLargeCompressedInput() {
const cs = new CompressionStream('deflate');
// The input has to be large enough that it won't fit in a single chunk when
// decompressed.
const writer = cs.writable.getWriter();
writer.write(new Uint8Array(kInputLength));
writer.close();
return concatenateStream(cs.readable);
}
promise_test(async () => {
const input = await createLargeCompressedInput();
const ds = new DecompressionStream('deflate');
const writer = ds.writable.getWriter();
writer.write(input);
writer.close();
// Object.prototype.then will be looked up synchronously when the promise
// returned by read() is resolved.
Object.defineProperty(Object.prototype, 'then', {
get() {
// Cause input to become detached and unreferenced.
try {
postMessage(undefined, 'nowhere', [input.buffer]);
} catch (e) {
// It's already detached.
}
}
});
const output = await concatenateStream(ds.readable);
// If output successfully decompressed and gave the right length, we can be
// reasonably confident that no data corruption happened.
assert_equals(
output.byteLength, kInputLength, 'output should be the right length');
}, 'data should be correctly decompressed even if input is detached partway');
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