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85ab4a5f12
Several changes:
* Soft-Deprecate Buffer() constructors
* Add `Buffer.from()`, `Buffer.alloc()`, and `Buffer.allocUnsafe()`
* Add `--zero-fill-buffers` command line option
* Add byteOffset and length to `new Buffer(arrayBuffer)` constructor
* buffer.fill('') previously had no effect, now zero-fills
* Update the docs
PR-URL: https://github.com/nodejs/node/pull/4682
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
117 lines
2.7 KiB
JavaScript
117 lines
2.7 KiB
JavaScript
'use strict';
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var common = require('../common');
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var assert = require('assert');
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var path = require('path');
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var fs = require('fs');
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var tmp = common.tmpDir;
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var filename = path.resolve(tmp, 'truncate-file.txt');
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var data = Buffer.alloc(1024 * 16, 'x');
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common.refreshTmpDir();
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var stat;
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// truncateSync
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fs.writeFileSync(filename, data);
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stat = fs.statSync(filename);
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assert.equal(stat.size, 1024 * 16);
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fs.truncateSync(filename, 1024);
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stat = fs.statSync(filename);
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assert.equal(stat.size, 1024);
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fs.truncateSync(filename);
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stat = fs.statSync(filename);
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assert.equal(stat.size, 0);
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// ftruncateSync
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fs.writeFileSync(filename, data);
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var fd = fs.openSync(filename, 'r+');
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stat = fs.statSync(filename);
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assert.equal(stat.size, 1024 * 16);
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fs.ftruncateSync(fd, 1024);
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stat = fs.statSync(filename);
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assert.equal(stat.size, 1024);
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fs.ftruncateSync(fd);
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stat = fs.statSync(filename);
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assert.equal(stat.size, 0);
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fs.closeSync(fd);
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// async tests
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var success = 0;
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testTruncate(function(er) {
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if (er) throw er;
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success++;
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testFtruncate(function(er) {
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if (er) throw er;
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success++;
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});
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});
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process.on('exit', function() {
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assert.equal(success, 2);
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console.log('ok');
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});
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function testTruncate(cb) {
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fs.writeFile(filename, data, function(er) {
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if (er) return cb(er);
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fs.stat(filename, function(er, stat) {
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if (er) return cb(er);
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assert.equal(stat.size, 1024 * 16);
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fs.truncate(filename, 1024, function(er) {
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if (er) return cb(er);
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fs.stat(filename, function(er, stat) {
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if (er) return cb(er);
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assert.equal(stat.size, 1024);
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fs.truncate(filename, function(er) {
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if (er) return cb(er);
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fs.stat(filename, function(er, stat) {
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if (er) return cb(er);
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assert.equal(stat.size, 0);
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cb();
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});
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});
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});
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});
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});
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});
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}
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function testFtruncate(cb) {
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fs.writeFile(filename, data, function(er) {
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if (er) return cb(er);
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fs.stat(filename, function(er, stat) {
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if (er) return cb(er);
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assert.equal(stat.size, 1024 * 16);
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fs.open(filename, 'w', function(er, fd) {
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if (er) return cb(er);
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fs.ftruncate(fd, 1024, function(er) {
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if (er) return cb(er);
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fs.stat(filename, function(er, stat) {
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if (er) return cb(er);
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assert.equal(stat.size, 1024);
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fs.ftruncate(fd, function(er) {
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if (er) return cb(er);
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fs.stat(filename, function(er, stat) {
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if (er) return cb(er);
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assert.equal(stat.size, 0);
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fs.close(fd, cb);
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});
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});
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});
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});
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});
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});
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});
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}
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