72 lines
1.5 KiB
JavaScript
72 lines
1.5 KiB
JavaScript
/**
|
|
* @license Apache-2.0
|
|
*
|
|
* Copyright (c) 2018 The Stdlib Authors.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
// MODULES //
|
|
|
|
var ctors = require( './ctors.js' );
|
|
|
|
|
|
// VARIABLES //
|
|
|
|
var bool;
|
|
|
|
|
|
// FUNCTIONS //
|
|
|
|
/**
|
|
* Returns a boolean indicating if an environment is big endian.
|
|
*
|
|
* @private
|
|
* @returns {boolean} boolean indicating if an environment is big endian
|
|
*
|
|
* @example
|
|
* var bool = isBigEndian();
|
|
* // returns <boolean>
|
|
*/
|
|
function isBigEndian() {
|
|
var uint16view;
|
|
var uint8view;
|
|
|
|
uint16view = new ctors[ 'uint16' ]( 1 );
|
|
|
|
/*
|
|
* Set the uint16 view to a value having distinguishable lower and higher order words.
|
|
*
|
|
* 4660 => 0x1234 => 0x12 0x34 => '00010010 00110100' => (0x12,0x34) == (18,52)
|
|
*/
|
|
uint16view[ 0 ] = 0x1234;
|
|
|
|
// Create a uint8 view on top of the uint16 buffer:
|
|
uint8view = new ctors[ 'uint8' ]( uint16view.buffer );
|
|
|
|
// If big endian, the least significant byte will be last...
|
|
return ( uint8view[ 1 ] === 0x34 );
|
|
}
|
|
|
|
|
|
// MAIN //
|
|
|
|
bool = isBigEndian();
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = bool;
|