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'use strict';
const common = require('../common');
const assert = require('assert');
const path = require('path');
const fs = require('fs').promises;
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
const expected = 'ümlaut. Лорем 運務ホソモ指及 आपको करने विकास 紙読決多密所 أضف';
const exptectedBuff = Buffer.from(expected);
let cnt = 0;
function getFileName() {
return path.join(tmpdir.path, `readv_promises_${++cnt}.txt`);
}
const allocateEmptyBuffers = (combinedLength) => {
const bufferArr = [];
// Allocate two buffers, each half the size of exptectedBuff
bufferArr[0] = Buffer.alloc(Math.floor(combinedLength / 2));
bufferArr[1] = Buffer.alloc(combinedLength - bufferArr[0].length);
return bufferArr;
};
(async () => {
{
const filename = getFileName();
await fs.writeFile(filename, exptectedBuff);
const handle = await fs.open(filename, 'r');
// const buffer = Buffer.from(expected);
const bufferArr = allocateEmptyBuffers(exptectedBuff.length);
const expectedLength = exptectedBuff.length;
let { bytesRead, buffers } = await handle.readv([Buffer.from('')],
null);
assert.deepStrictEqual(bytesRead, 0);
assert.deepStrictEqual(buffers, [Buffer.from('')]);
({ bytesRead, buffers } = await handle.readv(bufferArr, null));
assert.deepStrictEqual(bytesRead, expectedLength);
assert.deepStrictEqual(buffers, bufferArr);
assert(Buffer.concat(bufferArr).equals(await fs.readFile(filename)));
handle.close();
}
{
const filename = getFileName();
await fs.writeFile(filename, exptectedBuff);
const handle = await fs.open(filename, 'r');
// const buffer = Buffer.from(expected);
const bufferArr = allocateEmptyBuffers(exptectedBuff.length);
const expectedLength = exptectedBuff.length;
let { bytesRead, buffers } = await handle.readv([Buffer.from('')]);
assert.deepStrictEqual(bytesRead, 0);
assert.deepStrictEqual(buffers, [Buffer.from('')]);
({ bytesRead, buffers } = await handle.readv(bufferArr));
assert.deepStrictEqual(bytesRead, expectedLength);
assert.deepStrictEqual(buffers, bufferArr);
assert(Buffer.concat(bufferArr).equals(await fs.readFile(filename)));
handle.close();
}
})().then(common.mustCall());
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