password-manager/frontend/delta/js/Filesize/filesize.es6.js
2015-11-23 16:10:44 +01:00

172 lines
4.1 KiB
JavaScript

/*
Copyright 2008-2015 Clipperz Srl
This file is part of Clipperz, the online password manager.
For further information about its features and functionalities please
refer to http://www.clipperz.com.
* Clipperz is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
* Clipperz is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public
License along with Clipperz. If not, see http://www.gnu.org/licenses/.
*/
/**
* filesize
*
* @author Jason Mulligan <jason.mulligan@avoidwork.com>
* @copyright 2015 Jason Mulligan <jason.mulligan@avoidwork.com>
* @license BSD-3-Clause
* @link http://filesizejs.com
* @module filesize
* @version 3.1.3
*/
( global ) => {
const bit = /b$/;
const si = {
bits: [ "B", "kb", "Mb", "Gb", "Tb", "Pb", "Eb", "Zb", "Yb" ],
bytes: [ "B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" ]
};
/**
* filesize
*
* @method filesize
* @param {Mixed} arg String, Int or Float to transform
* @param {Object} descriptor [Optional] Flags
* @return {String} Readable file size String
*/
let filesize = ( arg, descriptor={} ) => {
let result = [];
let skip = false;
let val = 0;
let e, base, bits, ceil, neg, num, output, round, unix, spacer, suffixes;
if ( isNaN( arg ) ) {
throw new Error( "Invalid arguments" );
}
bits = ( descriptor.bits === true );
unix = ( descriptor.unix === true );
base = descriptor.base !== undefined ? descriptor.base : 2;
round = descriptor.round !== undefined ? descriptor.round : unix ? 1 : 2;
spacer = descriptor.spacer !== undefined ? descriptor.spacer : unix ? "" : " ";
suffixes = descriptor.suffixes !== undefined ? descriptor.suffixes : {};
output = descriptor.output !== undefined ? descriptor.output : "string";
e = descriptor.exponent !== undefined ? descriptor.exponent : -1;
num = Number( arg );
neg = ( num < 0 );
ceil = base > 2 ? 1000 : 1024;
// Flipping a negative number to determine the size
if ( neg ) {
num = -num;
}
// Zero is now a special case because bytes divide by 1
if ( num === 0 ) {
result[ 0 ] = 0;
if ( unix ) {
result[ 1 ] = "";
}
else {
result[ 1 ] = "B";
}
}
else {
// Determining the exponent
if ( e === -1 || isNaN( e ) ) {
e = Math.floor( Math.log( num ) / Math.log( ceil ) );
}
// Exceeding supported length, time to reduce & multiply
if ( e > 8 ) {
val = val * ( 1000 * ( e - 8 ) );
e = 8;
}
if ( base === 2 ) {
val = num / Math.pow( 2, ( e * 10 ) );
}
else {
val = num / Math.pow( 1000, e );
}
if ( bits ) {
val = ( val * 8 );
if ( val > ceil ) {
val = val / ceil;
e++;
}
}
result[ 0 ] = Number( val.toFixed( e > 0 ? round : 0 ) );
result[ 1 ] = si[ bits ? "bits" : "bytes" ][ e ];
if ( !skip && unix ) {
if ( bits && bit.test( result[ 1 ] ) ) {
result[ 1 ] = result[ 1 ].toLowerCase();
}
result[ 1 ] = result[ 1 ].charAt( 0 );
if ( result[ 1 ] === "B" ) {
result[ 0 ] = Math.floor( result[ 0 ] );
result[ 1 ] = "";
}
else if ( !bits && result[ 1 ] === "k" ) {
result[ 1 ] = "K";
}
}
}
// Decorating a 'diff'
if ( neg ) {
result[ 0 ] = -result[ 0 ];
}
// Applying custom suffix
result[ 1 ] = suffixes[ result[ 1 ] ] || result[ 1 ];
// Returning Array, Object, or String (default)
if ( output === "array" ) {
return result;
}
if ( output === "exponent" ) {
return e;
}
if ( output === "object" ) {
return { value: result[ 0 ], suffix: result[ 1 ] };
}
return result.join( spacer );
}
// CommonJS, AMD, script tag
if ( typeof exports !== "undefined" ) {
module.exports = filesize;
}
else if ( typeof define === "function" ) {
define( () => {
return filesize;
} );
}
else {
global.filesize = filesize;
}
}( typeof global !== "undefined" ? global : window );