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142 lines
3.2 KiB
142 lines
3.2 KiB
/**
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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 2013 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 2.0.0
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*/
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( function ( global ) {
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"use strict";
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var bit = /b$/,
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bite = /^B$/,
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radix = 10,
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right = /\.(.*)/,
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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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i = 6,
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base, bits, neg, num, round, size, sizes, unix, spacer, suffix, z;
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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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num = Number( arg );
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neg = ( num < 0 );
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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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result = "0" + spacer + "B";
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}
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}
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else {
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sizes = options[base][bits ? "bits" : "bytes"];
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while ( i-- ) {
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size = sizes[i][1];
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suffix = sizes[i][0];
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if ( num >= size ) {
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// Treating bytes as cardinal
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if ( bite.test( suffix ) ) {
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skip = true;
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round = 0;
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}
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result = ( num / size ).toFixed( round );
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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 = right.exec( result );
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if ( !bits && suffix === "k" ) {
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suffix = "K";
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}
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if ( z !== null && z[1] !== undefined && zero.test( z[1] ) ) {
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result = parseInt( result, radix );
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}
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result += spacer + suffix;
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}
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else if ( !unix ) {
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result += spacer + suffix;
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}
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break;
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}
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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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* Size options
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*
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* @type {Object}
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*/
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var options = {
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2 : {
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bits : [["B", 1], ["kb", 128], ["Mb", 131072], ["Gb", 134217728], ["Tb", 137438953472], ["Pb", 140737488355328]],
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bytes : [["B", 1], ["kB", 1024], ["MB", 1048576], ["GB", 1073741824], ["TB", 1099511627776], ["PB", 1125899906842624]]
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},
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10 : {
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bits : [["B", 1], ["kb", 125], ["Mb", 125000], ["Gb", 125000000], ["Tb", 125000000000], ["Pb", 125000000000000]],
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bytes : [["B", 1], ["kB", 1000], ["MB", 1000000], ["GB", 1000000000], ["TB", 1000000000000], ["PB", 1000000000000000]]
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}
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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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