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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 '' doesn't affect the compressed data.
// Example: compressing ['Hello', '', 'Hello'] results in 'HelloHello'
async function compressChunkList(chunkList, format) {
const cs = new CompressionStream(format);
const writer = cs.writable.getWriter();
for (const chunk of chunkList) {
const chunkByte = new TextEncoder().encode(chunk);
writer.write(chunkByte);
}
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 chunkLists = [
['', 'Hello', 'Hello'],
['Hello', '', 'Hello'],
['Hello', 'Hello', '']
];
const expectedValue = new TextEncoder().encode('HelloHello');
for (const chunkList of chunkLists) {
promise_test(async t => {
const compressedData = await compressChunkList(chunkList, 'deflate');
// 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');
}, `the result of compressing [${chunkList}] with deflate should be 'HelloHello'`);
promise_test(async t => {
const compressedData = await compressChunkList(chunkList, 'gzip');
// decompress with pako, and check that we got the same result as our original string
assert_array_equals(expectedValue, pako.inflate(compressedData), 'value should match');
}, `the result of compressing [${chunkList}] with gzip should be 'HelloHello'`);
promise_test(async t => {
const compressedData = await compressChunkList(chunkList, 'deflate-raw');
// 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');
}, `the result of compressing [${chunkList}] with deflate-raw should be 'HelloHello'`);
}
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