decompression-split-chunk.any.js

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// META: global=window,worker,shadowrealm

// META: script=resources/decompression-input.js

'use strict';

async function decompressArrayBuffer(input, format, chunkSize) {

  const ds = new DecompressionStream(format);

  const reader = ds.readable.getReader();

  const writer = ds.writable.getWriter();

  for (let beginning = 0; beginning < input.length; beginning += chunkSize) {

    writer.write(input.slice(beginning, beginning + chunkSize));

  writer.close();

  const out = [];

  let totalSize = 0;

  while (true) {

    const { value, done } = await reader.read();

    if (done) break;

    out.push(value);

    totalSize += value.byteLength;

  const concatenated = new Uint8Array(totalSize);

  let offset = 0;

  for (const array of out) {

    concatenated.set(array, offset);

    offset += array.byteLength;

  return concatenated;

for (const [format, bytes] of compressedBytes) {

  for (let chunkSize = 1; chunkSize < 16; ++chunkSize) {

    promise_test(async t => {

      const decompressedData = await decompressArrayBuffer(bytes, format, chunkSize);

      assert_array_equals(decompressedData, expectedChunkValue, "value should match");

    }, `decompressing splitted chunk into pieces of size ${chunkSize} should work in ${format}`);