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benchmark/util/text-decoder.js
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Mert Can Altin
src: skip duplicate UTF-8 validation in TextDecoder fatal path
27 май 2026, 22:31
27 май 2026, 22:31
4639dcb
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'use strict'; const common = require('../common.js'); const bench = common.createBenchmark(main, { encoding: ['utf-8', 'windows-1252', 'iso-8859-3'], ignoreBOM: [0, 1], fatal: [0, 1], type: ['SharedArrayBuffer', 'ArrayBuffer', 'Buffer'], content: ['ascii', 'one-byte-string', 'two-byte-string'], len: [256, 1024 * 16, 1024 * 128], n: [1e3], }); function buildContent(content, len) { let base; switch (content) { case 'ascii': base = 'a'; break; case 'one-byte-string': base = '\xff'; break; case 'two-byte-string': base = 'ğ'; break; } const unitBytes = Buffer.byteLength(base, 'utf8'); const copies = Math.max(1, Math.floor(len / unitBytes)); return Buffer.from(base.repeat(copies)); } function main({ encoding, len, n, ignoreBOM, type, fatal, content }) { const decoder = new TextDecoder(encoding, { ignoreBOM, fatal }); const seed = buildContent(content, len); let buf; switch (type) { case 'SharedArrayBuffer': { buf = new SharedArrayBuffer(seed.length); new Uint8Array(buf).set(seed); break; } case 'ArrayBuffer': { buf = new ArrayBuffer(seed.length); new Uint8Array(buf).set(seed); break; } case 'Buffer': { buf = seed; break; } } bench.start(); for (let i = 0; i < n; i++) { try { decoder.decode(buf); } catch { // eslint-disable no-empty } } bench.end(n); }