deno.land / std@0.166.0 / node / _tools / test / parallel / test-buffer-writedouble.js

test-buffer-writedouble.js
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// deno-fmt-ignore-file// deno-lint-ignore-file
// 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';
// Tests to verify doubles are correctly written
require('../common');const assert = require('assert');
const buffer = Buffer.allocUnsafe(16);
buffer.writeDoubleBE(2.225073858507201e-308, 0);buffer.writeDoubleLE(2.225073858507201e-308, 8);assert.ok(buffer.equals(new Uint8Array([ 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0f, 0x00,])));
buffer.writeDoubleBE(1.0000000000000004, 0);buffer.writeDoubleLE(1.0000000000000004, 8);assert.ok(buffer.equals(new Uint8Array([ 0x3f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x3f,])));
buffer.writeDoubleBE(-2, 0);buffer.writeDoubleLE(-2, 8);assert.ok(buffer.equals(new Uint8Array([ 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0,])));
buffer.writeDoubleBE(1.7976931348623157e+308, 0);buffer.writeDoubleLE(1.7976931348623157e+308, 8);assert.ok(buffer.equals(new Uint8Array([ 0x7f, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0x7f,])));
buffer.writeDoubleBE(0 * -1, 0);buffer.writeDoubleLE(0 * -1, 8);assert.ok(buffer.equals(new Uint8Array([ 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,])));
buffer.writeDoubleBE(Infinity, 0);buffer.writeDoubleLE(Infinity, 8);
assert.ok(buffer.equals(new Uint8Array([ 0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x7F,])));
assert.strictEqual(buffer.readDoubleBE(0), Infinity);assert.strictEqual(buffer.readDoubleLE(8), Infinity);
buffer.writeDoubleBE(-Infinity, 0);buffer.writeDoubleLE(-Infinity, 8);
assert.ok(buffer.equals(new Uint8Array([ 0xFF, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0, 0xFF,])));
assert.strictEqual(buffer.readDoubleBE(0), -Infinity);assert.strictEqual(buffer.readDoubleLE(8), -Infinity);
buffer.writeDoubleBE(NaN, 0);buffer.writeDoubleLE(NaN, 8);
// JS only knows a single NaN but there exist two platform specific// implementations. Therefore, allow both quiet and signalling NaNs.if (buffer[1] === 0xF7) { assert.ok(buffer.equals(new Uint8Array([ 0x7F, 0xF7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF7, 0x7F, ])));} else { assert.ok(buffer.equals(new Uint8Array([ 0x7F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x7F, ])));}
assert.ok(Number.isNaN(buffer.readDoubleBE(0)));assert.ok(Number.isNaN(buffer.readDoubleLE(8)));
// OOB in writeDouble{LE,BE} should throw.{ const small = Buffer.allocUnsafe(1);
['writeDoubleLE', 'writeDoubleBE'].forEach((fn) => {
// Verify that default offset works fine. buffer[fn](23, undefined); buffer[fn](23);
assert.throws( () => small[fn](11.11, 0), { code: 'ERR_BUFFER_OUT_OF_BOUNDS', name: 'RangeError', message: 'Attempt to access memory outside buffer bounds' });
['', '0', null, {}, [], () => {}, true, false].forEach((off) => { assert.throws( () => small[fn](23, off), { code: 'ERR_INVALID_ARG_TYPE' }); });
[Infinity, -1, 9].forEach((offset) => { assert.throws( () => buffer[fn](23, offset), { code: 'ERR_OUT_OF_RANGE', name: 'RangeError', message: 'The value of "offset" is out of range. ' + `It must be >= 0 and <= 8. Received ${offset}` }); });
[NaN, 1.01].forEach((offset) => { assert.throws( () => buffer[fn](42, offset), { code: 'ERR_OUT_OF_RANGE', name: 'RangeError', message: 'The value of "offset" is out of range. ' + `It must be an integer. Received ${offset}` }); }); });}
std

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Tagged at
a year ago