const common = require('../common.js');

const bench = common.createBenchmark(main, {

encoding: ['utf-8', 'utf-16le'],

ignoreBOM: [0, 1],

fatal: [0, 1],

unicode: [0, 1],

len: [256, 1024 * 16, 1024 * 128],

chunks: [10],

n: [1e3],

type: ['SharedArrayBuffer', 'ArrayBuffer', 'Buffer'],

const UNICODE_ALPHA = 'Blåbærsyltetøy';

const ASCII_ALPHA = 'Blueberry jam';

function main({ encoding, len, unicode, chunks, n, ignoreBOM, type, fatal }) {

const decoder = new TextDecoder(encoding, { ignoreBOM, fatal });

let buf;

const fill = Buffer.from(unicode ? UNICODE_ALPHA : ASCII_ALPHA, encoding);

switch (type) {

case 'SharedArrayBuffer': {

buf = new SharedArrayBuffer(len);

Buffer.from(buf).fill(fill);

break;

}

case 'ArrayBuffer': {

buf = new ArrayBuffer(len);

Buffer.from(buf).fill(fill);

break;

}

case 'Buffer': {

buf = Buffer.alloc(len, fill);

break;

}

}

const chunk = Math.ceil(len / chunks);

const max = len - chunk;

bench.start();

for (let i = 0; i < n; i++) {

let pos = 0;

while (pos < max) {

decoder.decode(buf.slice(pos, pos + chunk), { stream: true });

pos += chunk;

}

decoder.decode(buf.slice(pos));

}

bench.end(n);