// Copyright Joyent, Inc. and other Node contributors.
//
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
const common = require('../common');

const assert = require('assert');
const fs = require('fs');
const path = require('path');

const tmpdir = require('../common/tmpdir');
tmpdir.refresh();

const filepath = path.join(tmpdir.path, 'large.txt');
const fd = fs.openSync(filepath, 'w+');
const offset = 5 * 1024 * 1024 * 1024; // 5GB
const message = 'Large File';

fs.truncateSync(fd, offset);
assert.strictEqual(fs.statSync(filepath).size, offset);
const writeBuf = Buffer.from(message);
fs.writeSync(fd, writeBuf, 0, writeBuf.length, offset);
const readBuf = Buffer.allocUnsafe(writeBuf.length);
fs.readSync(fd, readBuf, 0, readBuf.length, offset);
assert.strictEqual(readBuf.toString(), message);
fs.readSync(fd, readBuf, 0, 1, 0);
assert.strictEqual(readBuf[0], 0);

// Verify that floating point positions do not throw.
fs.writeSync(fd, writeBuf, 0, writeBuf.length, 42.000001);
fs.close(fd, common.mustCall());

// Normally, we don't clean up tmp files at the end of a test, but we'll make an
// exception for a 5 GB file.
process.on('exit', function() {
  fs.unlinkSync(filepath);
});