deno.land / std@0.166.0 / node / _tools / test / parallel / test-buffer-swap.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');
// Test buffers small enough to use the JS implementation{ const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10]);
assert.strictEqual(buf, buf.swap16()); assert.deepStrictEqual(buf, Buffer.from([0x02, 0x01, 0x04, 0x03, 0x06, 0x05, 0x08, 0x07, 0x0a, 0x09, 0x0c, 0x0b, 0x0e, 0x0d, 0x10, 0x0f])); buf.swap16(); // restore
assert.strictEqual(buf, buf.swap32()); assert.deepStrictEqual(buf, Buffer.from([0x04, 0x03, 0x02, 0x01, 0x08, 0x07, 0x06, 0x05, 0x0c, 0x0b, 0x0a, 0x09, 0x10, 0x0f, 0x0e, 0x0d])); buf.swap32(); // restore
assert.strictEqual(buf, buf.swap64()); assert.deepStrictEqual(buf, Buffer.from([0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x10, 0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09]));}
// Operates in-place{ const buf = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7]); buf.slice(1, 5).swap32(); assert.deepStrictEqual(buf, Buffer.from([0x1, 0x5, 0x4, 0x3, 0x2, 0x6, 0x7])); buf.slice(1, 5).swap16(); assert.deepStrictEqual(buf, Buffer.from([0x1, 0x4, 0x5, 0x2, 0x3, 0x6, 0x7]));
// Length assertions const re16 = /Buffer size must be a multiple of 16-bits/; const re32 = /Buffer size must be a multiple of 32-bits/; const re64 = /Buffer size must be a multiple of 64-bits/;
assert.throws(() => Buffer.from(buf).swap16(), re16); assert.throws(() => Buffer.alloc(1025).swap16(), re16); assert.throws(() => Buffer.from(buf).swap32(), re32); assert.throws(() => buf.slice(1, 3).swap32(), re32); assert.throws(() => Buffer.alloc(1025).swap32(), re32); assert.throws(() => buf.slice(1, 3).swap64(), re64); assert.throws(() => Buffer.alloc(1025).swap64(), re64);}
{ const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10]);
buf.slice(2, 18).swap64();
assert.deepStrictEqual(buf, Buffer.from([0x01, 0x02, 0x0a, 0x09, 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x10, 0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10]));}
// Force use of native code (Buffer size above threshold limit for js impl){ const bufData = new Uint32Array(256).fill(0x04030201); const buf = Buffer.from(bufData.buffer, bufData.byteOffset); const otherBufData = new Uint32Array(256).fill(0x03040102); const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset); buf.swap16(); assert.deepStrictEqual(buf, otherBuf);}
{ const bufData = new Uint32Array(256).fill(0x04030201); const buf = Buffer.from(bufData.buffer); const otherBufData = new Uint32Array(256).fill(0x01020304); const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset); buf.swap32(); assert.deepStrictEqual(buf, otherBuf);}
{ const bufData = new Uint8Array(256 * 8); const otherBufData = new Uint8Array(256 * 8); for (let i = 0; i < bufData.length; i++) { bufData[i] = i % 8; otherBufData[otherBufData.length - i - 1] = i % 8; } const buf = Buffer.from(bufData.buffer, bufData.byteOffset); const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset); buf.swap64(); assert.deepStrictEqual(buf, otherBuf);}
// Test native code with buffers that are not memory-aligned{ const bufData = new Uint8Array(256 * 8); const otherBufData = new Uint8Array(256 * 8 - 2); for (let i = 0; i < bufData.length; i++) { bufData[i] = i % 2; } for (let i = 1; i < otherBufData.length; i++) { otherBufData[otherBufData.length - i] = (i + 1) % 2; } const buf = Buffer.from(bufData.buffer, bufData.byteOffset); // 0|1 0|1 0|1... const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset); // 0|0 1|0 1|0...
buf.slice(1, buf.length - 1).swap16(); assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);}
{ const bufData = new Uint8Array(256 * 8); const otherBufData = new Uint8Array(256 * 8 - 4); for (let i = 0; i < bufData.length; i++) { bufData[i] = i % 4; } for (let i = 1; i < otherBufData.length; i++) { otherBufData[otherBufData.length - i] = (i + 1) % 4; } const buf = Buffer.from(bufData.buffer, bufData.byteOffset); // 0|1 2 3 0|1 2 3... const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset); // 0|0 3 2 1|0 3 2...
buf.slice(1, buf.length - 3).swap32(); assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);}
{ const bufData = new Uint8Array(256 * 8); const otherBufData = new Uint8Array(256 * 8 - 8); for (let i = 0; i < bufData.length; i++) { bufData[i] = i % 8; } for (let i = 1; i < otherBufData.length; i++) { otherBufData[otherBufData.length - i] = (i + 1) % 8; } const buf = Buffer.from(bufData.buffer, bufData.byteOffset); // 0|1 2 3 4 5 6 7 0|1 2 3 4... const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset); // 0|0 7 6 5 4 3 2 1|0 7 6 5...
buf.slice(1, buf.length - 7).swap64(); assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);}
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