compression-including-empty-chunk.any.js (1779B)
1 // META: global=window,worker,shadowrealm 2 // META: script=third_party/pako/pako_inflate.min.js 3 // META: script=resources/decompress.js 4 // META: script=resources/formats.js 5 // META: timeout=long 6 7 'use strict'; 8 9 // This test asserts that compressing '' doesn't affect the compressed data. 10 // Example: compressing ['Hello', '', 'Hello'] results in 'HelloHello' 11 12 async function compressChunkList(chunkList, format) { 13 const cs = new CompressionStream(format); 14 const writer = cs.writable.getWriter(); 15 for (const chunk of chunkList) { 16 const chunkByte = new TextEncoder().encode(chunk); 17 writer.write(chunkByte); 18 } 19 const closePromise = writer.close(); 20 const out = []; 21 const reader = cs.readable.getReader(); 22 let totalSize = 0; 23 while (true) { 24 const { value, done } = await reader.read(); 25 if (done) 26 break; 27 out.push(value); 28 totalSize += value.byteLength; 29 } 30 await closePromise; 31 const concatenated = new Uint8Array(totalSize); 32 let offset = 0; 33 for (const array of out) { 34 concatenated.set(array, offset); 35 offset += array.byteLength; 36 } 37 return concatenated; 38 } 39 40 const chunkLists = [ 41 ['', 'Hello', 'Hello'], 42 ['Hello', '', 'Hello'], 43 ['Hello', 'Hello', ''] 44 ]; 45 const expectedValue = new TextEncoder().encode('HelloHello'); 46 47 for (const format of formats) { 48 for (const chunkList of chunkLists) { 49 promise_test(async t => { 50 const compressedData = await compressChunkList(chunkList, format); 51 const decompressedData = await decompressDataOrPako(compressedData, format); 52 // check that we got the same result as our original string 53 assert_array_equals(expectedValue, decompressedData, 'value should match'); 54 }, `the result of compressing [${chunkList}] with ${format} should be 'HelloHello'`); 55 } 56 }