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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>
33 lines
789 B
JavaScript
33 lines
789 B
JavaScript
'use strict';
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// Flags: --zero-fill-buffers
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// when using --zero-fill-buffers, every Buffer and SlowBuffer
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// instance must be zero filled upon creation
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require('../common');
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const SlowBuffer = require('buffer').SlowBuffer;
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const assert = require('assert');
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function isZeroFilled(buf) {
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for (let n = 0; n < buf.length; n++)
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if (buf[n] > 0) return false;
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return true;
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}
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// This can be somewhat unreliable because the
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// allocated memory might just already happen to
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// contain all zeroes. The test is run multiple
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// times to improve the reliability.
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for (let i = 0; i < 50; i++) {
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const bufs = [
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Buffer.alloc(20),
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Buffer.allocUnsafe(20),
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SlowBuffer(20),
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Buffer(20),
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new SlowBuffer(20)
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];
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for (const buf of bufs) {
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assert(isZeroFilled(buf));
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}
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}
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