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// META: global=window,worker,shadowrealm
'use strict';
// This test asserts that compressed data length is shorter than the original
// data length. If the input is extremely small, the compressed data may be
// larger than the original data.
const LARGE_FILE = '/media/test-av-384k-44100Hz-1ch-320x240-30fps-10kfr.webm';
async function compressArrayBuffer(input, format) {
const cs = new CompressionStream(format);
const writer = cs.writable.getWriter();
writer.write(input);
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;
}
promise_test(async () => {
const response = await fetch(LARGE_FILE);
const buffer = await response.arrayBuffer();
const bufferView = new Uint8Array(buffer);
const originalLength = bufferView.length;
const compressedData = await compressArrayBuffer(bufferView, 'deflate');
const compressedLength = compressedData.length;
assert_less_than(compressedLength, originalLength, 'output should be smaller');
}, 'the length of deflated data should be shorter than that of the original data');
promise_test(async () => {
const response = await fetch(LARGE_FILE);
const buffer = await response.arrayBuffer();
const bufferView = new Uint8Array(buffer);
const originalLength = bufferView.length;
const compressedData = await compressArrayBuffer(bufferView, 'gzip');
const compressedLength = compressedData.length;
assert_less_than(compressedLength, originalLength, 'output should be smaller');
}, 'the length of gzipped data should be shorter than that of the original data');
promise_test(async () => {
const response = await fetch(LARGE_FILE);
const buffer = await response.arrayBuffer();
const bufferView = new Uint8Array(buffer);
const originalLength = bufferView.length;
const compressedData = await compressArrayBuffer(bufferView, 'deflate-raw');
const compressedLength = compressedData.length;
assert_less_than(compressedLength, originalLength, 'output should be smaller');
}, 'the length of deflated (with -raw) data should be shorter than that of the original data');
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