/usr/lib/nodejs/bytes/index.js is in node-bytes 2.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* bytes
* Copyright(c) 2012-2014 TJ Holowaychuk
* Copyright(c) 2015 Jed Watson
* MIT Licensed
*/
'use strict';
/**
* Module exports.
* @public
*/
module.exports = bytes;
module.exports.format = format;
module.exports.parse = parse;
/**
* Module variables.
* @private
*/
var map = {
b: 1,
kb: 1 << 10,
mb: 1 << 20,
gb: 1 << 30,
tb: ((1 << 30) * 1024)
};
/**
*Convert the given value in bytes into a string or parse to string to an integer in bytes.
*
* @param {string|number} value
* @param {{
* case: [string],
* thousandsSeparator: [string]
* }} [options] bytes options.
*
* @returns {string|number|null}
*/
function bytes(value, options) {
if (typeof value === 'string') {
return parse(value);
}
if (typeof value === 'number') {
return format(value, options);
}
return null;
}
/**
* Format the given value in bytes into a string.
*
* If the value is negative, it is kept as such. If it is a float,
* it is rounded.
*
* @param {number} value
* @param {object} [options]
* @param {string} [options.thousandsSeparator=]
* @public
*/
function format(val, options) {
if (typeof val !== 'number') {
return null;
}
var mag = Math.abs(val);
var thousandsSeparator = (options && options.thousandsSeparator) || '';
var unit = 'B';
var value = val;
if (mag >= map.tb) {
value = Math.round(value / map.tb * 100) / 100;
unit = 'TB';
} else if (mag >= map.gb) {
value = Math.round(value / map.gb * 100) / 100;
unit = 'GB';
} else if (mag >= map.mb) {
value = Math.round(value / map.mb * 100) / 100;
unit = 'MB';
} else if (mag >= map.kb) {
value = Math.round(value / map.kb * 100) / 100;
unit = 'kB';
}
if (thousandsSeparator) {
value = value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, thousandsSeparator);
}
return value + unit;
}
/**
* Parse the string value into an integer in bytes.
*
* If no unit is given, it is assumed the value is in bytes.
*
* @param {number|string} val
* @public
*/
function parse(val) {
if (typeof val === 'number' && !isNaN(val)) {
return val;
}
if (typeof val !== 'string') {
return null;
}
// Test if the string passed is valid
var results = val.match(/^((-|\+)?(\d+(?:\.\d+)?)) *(kb|mb|gb|tb)$/i);
var floatValue;
var unit = 'b';
if (!results) {
// Nothing could be extracted from the given string
floatValue = parseInt(val);
unit = 'b'
} else {
// Retrieve the value and the unit
floatValue = parseFloat(results[1]);
unit = results[4].toLowerCase();
}
return map[unit] * floatValue;
}
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