deno.land / std@0.166.0 / node / _tools / test / parallel / test-buffer-copy.js
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// Copyright Joyent and Node contributors. All rights reserved. MIT license.// Taken from Node 18.12.0// This file is automatically generated by "node/_tools/setup.ts". Do not modify this file manually
'use strict';
require('../common');const assert = require('assert');
const b = Buffer.allocUnsafe(1024);const c = Buffer.allocUnsafe(512);
let cntr = 0;
{ // copy 512 bytes, from 0 to 512. b.fill(++cntr); c.fill(++cntr); const copied = b.copy(c, 0, 0, 512); assert.strictEqual(copied, 512); for (let i = 0; i < c.length; i++) { assert.strictEqual(c[i], b[i]); }}
{ // Current behavior is to coerce values to integers. b.fill(++cntr); c.fill(++cntr); const copied = b.copy(c, '0', '0', '512'); assert.strictEqual(copied, 512); for (let i = 0; i < c.length; i++) { assert.strictEqual(c[i], b[i]); }}
{ // Floats will be converted to integers via `Math.floor` b.fill(++cntr); c.fill(++cntr); const copied = b.copy(c, 0, 0, 512.5); assert.strictEqual(copied, 512); for (let i = 0; i < c.length; i++) { assert.strictEqual(c[i], b[i]); }}
{ // Copy c into b, without specifying sourceEnd b.fill(++cntr); c.fill(++cntr); const copied = c.copy(b, 0, 0); assert.strictEqual(copied, c.length); for (let i = 0; i < c.length; i++) { assert.strictEqual(b[i], c[i]); }}
{ // Copy c into b, without specifying sourceStart b.fill(++cntr); c.fill(++cntr); const copied = c.copy(b, 0); assert.strictEqual(copied, c.length); for (let i = 0; i < c.length; i++) { assert.strictEqual(b[i], c[i]); }}
{ // Copied source range greater than source length b.fill(++cntr); c.fill(++cntr); const copied = c.copy(b, 0, 0, c.length + 1); assert.strictEqual(copied, c.length); for (let i = 0; i < c.length; i++) { assert.strictEqual(b[i], c[i]); }}
{ // Copy longer buffer b to shorter c without targetStart b.fill(++cntr); c.fill(++cntr); const copied = b.copy(c); assert.strictEqual(copied, c.length); for (let i = 0; i < c.length; i++) { assert.strictEqual(c[i], b[i]); }}
{ // Copy starting near end of b to c b.fill(++cntr); c.fill(++cntr); const copied = b.copy(c, 0, b.length - Math.floor(c.length / 2)); assert.strictEqual(copied, Math.floor(c.length / 2)); for (let i = 0; i < Math.floor(c.length / 2); i++) { assert.strictEqual(c[i], b[b.length - Math.floor(c.length / 2) + i]); } for (let i = Math.floor(c.length / 2) + 1; i < c.length; i++) { assert.strictEqual(c[c.length - 1], c[i]); }}
{ // Try to copy 513 bytes, and check we don't overrun c b.fill(++cntr); c.fill(++cntr); const copied = b.copy(c, 0, 0, 513); assert.strictEqual(copied, c.length); for (let i = 0; i < c.length; i++) { assert.strictEqual(c[i], b[i]); }}
{ // copy 768 bytes from b into b b.fill(++cntr); b.fill(++cntr, 256); const copied = b.copy(b, 0, 256, 1024); assert.strictEqual(copied, 768); for (let i = 0; i < b.length; i++) { assert.strictEqual(b[i], cntr); }}
// Copy string longer than buffer length (failure will segfault)const bb = Buffer.allocUnsafe(10);bb.fill('hello crazy world');
// Try to copy from before the beginning of b. Should not throw.b.copy(c, 0, 100, 10);
// Throw with invalid source typeassert.throws( () => Buffer.prototype.copy.call(0), { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError', });
// Copy throws at negative targetStartassert.throws( () => Buffer.allocUnsafe(5).copy(Buffer.allocUnsafe(5), -1, 0), { code: 'ERR_OUT_OF_RANGE', name: 'RangeError', message: 'The value of "targetStart" is out of range. ' + 'It must be >= 0. Received -1' });
// Copy throws at negative sourceStartassert.throws( () => Buffer.allocUnsafe(5).copy(Buffer.allocUnsafe(5), 0, -1), { code: 'ERR_OUT_OF_RANGE', name: 'RangeError', message: 'The value of "sourceStart" is out of range. ' + 'It must be >= 0. Received -1' });
{ // Check sourceEnd resets to targetEnd if former is greater than the latter b.fill(++cntr); c.fill(++cntr); b.copy(c, 0, 0, 1025); for (let i = 0; i < c.length; i++) { assert.strictEqual(c[i], b[i]); }}
// Throw with negative sourceEndassert.throws( () => b.copy(c, 0, 0, -1), { code: 'ERR_OUT_OF_RANGE', name: 'RangeError', message: 'The value of "sourceEnd" is out of range. ' + 'It must be >= 0. Received -1' });
// When sourceStart is greater than sourceEnd, zero copiedassert.strictEqual(b.copy(c, 0, 100, 10), 0);
// When targetStart > targetLength, zero copiedassert.strictEqual(b.copy(c, 512, 0, 10), 0);
// Test that the `target` can be a Uint8Array.{ const d = new Uint8Array(c); // copy 512 bytes, from 0 to 512. b.fill(++cntr); d.fill(++cntr); const copied = b.copy(d, 0, 0, 512); assert.strictEqual(copied, 512); for (let i = 0; i < d.length; i++) { assert.strictEqual(d[i], b[i]); }}
// Test that the source can be a Uint8Array, too.{ const e = new Uint8Array(b); // copy 512 bytes, from 0 to 512. e.fill(++cntr); c.fill(++cntr); const copied = Buffer.prototype.copy.call(e, c, 0, 0, 512); assert.strictEqual(copied, 512); for (let i = 0; i < c.length; i++) { assert.strictEqual(c[i], e[i]); }}
// https://github.com/nodejs/node/issues/23668: Do not crash for invalid input.c.fill('c');b.copy(c, 'not a valid offset');// Make sure this acted like a regular copy with `0` offset.assert.deepStrictEqual(c, b.slice(0, c.length));
{ c.fill('C'); assert.throws(() => { b.copy(c, { [Symbol.toPrimitive]() { throw new Error('foo'); } }); }, /foo/); // No copying took place: assert.deepStrictEqual(c.toString(), 'C'.repeat(c.length));}
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