1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23const common = require('../common'); 24 25const assert = require('assert'); 26const fs = require('fs'); 27const path = require('path'); 28 29const tmpdir = require('../common/tmpdir'); 30tmpdir.refresh(); 31 32const filepath = path.join(tmpdir.path, 'large.txt'); 33const fd = fs.openSync(filepath, 'w+'); 34const offset = 5 * 1024 * 1024 * 1024; // 5GB 35const message = 'Large File'; 36 37fs.ftruncateSync(fd, offset); 38assert.strictEqual(fs.statSync(filepath).size, offset); 39const writeBuf = Buffer.from(message); 40fs.writeSync(fd, writeBuf, 0, writeBuf.length, offset); 41const readBuf = Buffer.allocUnsafe(writeBuf.length); 42fs.readSync(fd, readBuf, 0, readBuf.length, offset); 43assert.strictEqual(readBuf.toString(), message); 44fs.readSync(fd, readBuf, 0, 1, 0); 45assert.strictEqual(readBuf[0], 0); 46 47// Verify that floating point positions do not throw. 48fs.writeSync(fd, writeBuf, 0, writeBuf.length, 42.000001); 49fs.close(fd, common.mustCall()); 50