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// META: global=window,worker
// META: script=third_party/pako/pako_inflate.min.js
// META: timeout=long
'use strict';
// This test asserts that compressing multiple chunks should work.
// Example: ('Hello', 3) => TextEncoder().encode('HelloHelloHello')
function makeExpectedChunk(input, numberOfChunks) {
const expectedChunk = input.repeat(numberOfChunks);
return new TextEncoder().encode(expectedChunk);
}
// Example: ('Hello', 3, 'deflate') => compress ['Hello', 'Hello', Hello']
async function compressMultipleChunks(input, numberOfChunks, format) {
const cs = new CompressionStream(format);
const writer = cs.writable.getWriter();
const chunk = new TextEncoder().encode(input);
for (let i = 0; i < numberOfChunks; ++i) {
writer.write(chunk);
}
const closePromise = writer.close();
const out = [];
const reader = cs.readable.getReader();
let totalSize = 0;
while (true) {
const { value, done } = await reader.read();
if (done)
break;
out.push(value);
totalSize += value.byteLength;
}
await closePromise;
const concatenated = new Uint8Array(totalSize);
let offset = 0;
for (const array of out) {
concatenated.set(array, offset);
offset += array.byteLength;
}
return concatenated;
}
const hello = 'Hello';
for (let numberOfChunks = 2; numberOfChunks <= 16; ++numberOfChunks) {
promise_test(async t => {
const compressedData = await compressMultipleChunks(hello, numberOfChunks, 'deflate');
const expectedValue = makeExpectedChunk(hello, numberOfChunks);
// decompress with pako, and check that we got the same result as our original string
assert_array_equals(expectedValue, pako.inflate(compressedData), 'value should match');
}, `compressing ${numberOfChunks} chunks with deflate should work`);
promise_test(async t => {
const compressedData = await compressMultipleChunks(hello, numberOfChunks, 'gzip');
const expectedValue = makeExpectedChunk(hello, numberOfChunks);
// decompress with pako, and check that we got the same result as our original string
assert_array_equals(expectedValue, pako.inflate(compressedData), 'value should match');
}, `compressing ${numberOfChunks} chunks with gzip should work`);
promise_test(async t => {
const compressedData = await compressMultipleChunks(hello, numberOfChunks, 'deflate-raw');
const expectedValue = makeExpectedChunk(hello, numberOfChunks);
// decompress with pako, and check that we got the same result as our original string
assert_array_equals(expectedValue, pako.inflateRaw(compressedData), 'value should match');
}, `compressing ${numberOfChunks} chunks with deflate-raw should work`);
}
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