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