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'use strict';
const common = require('../common');
// The following tests validate base functionality for the fs.promises
// FileHandle.read method.
const fs = require('fs');
const { open } = fs.promises;
const path = require('path');
const fixtures = require('../common/fixtures');
const tmpdir = require('../common/tmpdir');
const assert = require('assert');
const tmpDir = tmpdir.path;
tmpdir.refresh();
async function validateRead() {
const filePath = path.resolve(tmpDir, 'tmp-read-file.txt');
const fileHandle = await open(filePath, 'w+');
const buffer = Buffer.from('Hello world', 'utf8');
const fd = fs.openSync(filePath, 'w+');
fs.writeSync(fd, buffer, 0, buffer.length);
fs.closeSync(fd);
const readAsyncHandle = await fileHandle.read(Buffer.alloc(11), 0, 11, 0);
assert.deepStrictEqual(buffer.length, readAsyncHandle.bytesRead);
assert.deepStrictEqual(buffer, readAsyncHandle.buffer);
await fileHandle.close();
}
async function validateEmptyRead() {
const filePath = path.resolve(tmpDir, 'tmp-read-empty-file.txt');
const fileHandle = await open(filePath, 'w+');
const buffer = Buffer.from('', 'utf8');
const fd = fs.openSync(filePath, 'w+');
fs.writeSync(fd, buffer, 0, buffer.length);
fs.closeSync(fd);
const readAsyncHandle = await fileHandle.read(Buffer.alloc(11), 0, 11, 0);
assert.deepStrictEqual(buffer.length, readAsyncHandle.bytesRead);
await fileHandle.close();
}
async function validateLargeRead() {
// Reading beyond file length (3 in this case) should return no data.
// This is a test for a bug where reads > uint32 would return data
// from the current position in the file.
const filePath = fixtures.path('x.txt');
const fileHandle = await open(filePath, 'r');
const pos = 0xffffffff + 1; // max-uint32 + 1
const readHandle = await fileHandle.read(Buffer.alloc(1), 0, 1, pos);
assert.strictEqual(readHandle.bytesRead, 0);
}
validateRead()
.then(validateEmptyRead)
.then(validateLargeRead)
.then(common.mustCall());
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