All files / assert/is-little-endian/lib main.js

100% Statements 71/71
100% Branches 2/2
100% Functions 1/1
100% Lines 71/71

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 728x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x  
/**
* @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 little endian.
*
* @private
* @returns {boolean} boolean indicating if an environment is little endian
*
* @example
* var bool = isLittleEndian();
* // returns <boolean>
*/
function isLittleEndian() {
	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 little endian, the least significant byte will be first...
	return ( uint8view[ 0 ] === 0x34 );
}
 
 
// MAIN //
 
bool = isLittleEndian();
 
 
// EXPORTS //
 
module.exports = bool;