forked from zhurui/management
149 lines
3.1 KiB
JavaScript
149 lines
3.1 KiB
JavaScript
/**
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* filesize
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*
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* @author Jason Mulligan <jason.mulligan@avoidwork.com>
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* @copyright 2014 Jason Mulligan
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* @license BSD-3 <https://raw.github.com/avoidwork/filesize.js/master/LICENSE>
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* @link http://filesizejs.com
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* @module filesize
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* @version 2.0.4
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*/
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( function ( global ) {
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"use strict";
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var bit = /b$/,
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radix = 10,
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left = /.*\./,
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zero = /^0$/;
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/**
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* filesize
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*
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* @method filesize
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* @param {Mixed} arg String, Int or Float to transform
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* @param {Object} descriptor [Optional] Flags
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* @return {String} Readable file size String
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*/
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function filesize ( arg, descriptor ) {
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var result = "",
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skip = false,
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val = 0,
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e, base, bits, ceil, neg, num, round, unix, spacer, suffix, z, suffixes;
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if ( isNaN( arg ) ) {
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throw new Error( "Invalid arguments" );
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}
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descriptor = descriptor || {};
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bits = ( descriptor.bits === true );
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unix = ( descriptor.unix === true );
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base = descriptor.base !== undefined ? descriptor.base : unix ? 2 : 10;
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round = descriptor.round !== undefined ? descriptor.round : unix ? 1 : 2;
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spacer = descriptor.spacer !== undefined ? descriptor.spacer : unix ? "" : " ";
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suffixes = descriptor.suffixes !== undefined ? descriptor.suffixes : {};
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num = Number( arg );
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neg = ( num < 0 );
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ceil = base > 2 ? 1000 : 1024;
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// Flipping a negative number to determine the size
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if ( neg ) {
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num = -num;
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}
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// Zero is now a special case because bytes divide by 1
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if ( num === 0 ) {
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if ( unix ) {
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result = "0";
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}
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else {
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suffix = "B";
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result = "0" + spacer + ( suffixes[suffix] || suffix );
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}
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}
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else {
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e = Math.floor( Math.log( num ) / Math.log( 1000 ) );
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// Exceeding supported length, time to reduce & multiply
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if ( e > 8 ) {
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val = val * ( 1000 * ( e - 8 ) );
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e = 8;
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}
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if ( base === 2 ) {
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val = num / Math.pow( 2, ( e * 10 ) );
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}
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else {
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val = num / Math.pow( 1000, e );
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}
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if ( bits ) {
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val = ( val * 8 );
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if ( val > ceil ) {
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val = val / ceil;
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e++;
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}
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}
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result = val.toFixed( e > 0 ? round : 0 );
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suffix = si[bits ? "bits" : "bytes"][e];
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if ( !skip && unix ) {
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if ( bits && bit.test( suffix ) ) {
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suffix = suffix.toLowerCase();
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}
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suffix = suffix.charAt( 0 );
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z = result.replace( left, "" );
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if ( suffix === "B" ) {
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suffix = "";
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}
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else if ( !bits && suffix === "k" ) {
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suffix = "K";
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}
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if ( zero.test( z ) ) {
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result = parseInt( result, radix ).toString();
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}
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result += spacer + ( suffixes[suffix] || suffix );
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}
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else if ( !unix ) {
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result += spacer + ( suffixes[suffix] || suffix );
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}
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}
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// Decorating a 'diff'
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if ( neg ) {
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result = "-" + result;
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}
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return result;
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}
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/**
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* SI suffixes
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*
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* @type {Object}
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*/
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var si = {
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bits : ["B", "kb", "Mb", "Gb", "Tb", "Pb", "Eb", "Zb", "Yb"],
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bytes : ["B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
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};
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// CommonJS, AMD, script tag
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if ( typeof exports !== "undefined" ) {
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module.exports = filesize;
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}
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else if ( typeof define === "function" ) {
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define( function () {
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return filesize;
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} );
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}
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else {
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global.filesize = filesize;
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}
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} )( this );
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