156 lines
3.5 KiB
JavaScript
156 lines
3.5 KiB
JavaScript
"use strict";
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/**
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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 2015 Jason Mulligan <jason.mulligan@avoidwork.com>
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* @license BSD-3-Clause
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* @link http://filesizejs.com
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* @module filesize
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* @version 3.1.3
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*/
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(function (global) {
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var bit = /b$/;
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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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/**
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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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var filesize = function (arg) {
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var descriptor = arguments[1] === undefined ? {} : arguments[1];
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var result = [];
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var skip = false;
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var val = 0;
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var e = undefined,
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base = undefined,
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bits = undefined,
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ceil = undefined,
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neg = undefined,
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num = undefined,
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output = undefined,
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round = undefined,
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unix = undefined,
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spacer = undefined,
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suffixes = undefined;
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if (isNaN(arg)) {
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throw new Error("Invalid arguments");
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}
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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 : 2;
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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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output = descriptor.output !== undefined ? descriptor.output : "string";
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e = descriptor.exponent !== undefined ? descriptor.exponent : -1;
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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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result[0] = 0;
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if (unix) {
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result[1] = "";
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} else {
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result[1] = "B";
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}
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} else {
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// Determining the exponent
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if (e === -1 || isNaN(e)) {
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e = Math.floor(Math.log(num) / Math.log(ceil));
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}
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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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} 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[0] = Number(val.toFixed(e > 0 ? round : 0));
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result[1] = si[bits ? "bits" : "bytes"][e];
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if (!skip && unix) {
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if (bits && bit.test(result[1])) {
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result[1] = result[1].toLowerCase();
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}
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result[1] = result[1].charAt(0);
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if (result[1] === "B") {
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result[0] = Math.floor(result[0]);
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result[1] = "";
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} else if (!bits && result[1] === "k") {
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result[1] = "K";
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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[0] = -result[0];
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}
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// Applying custom suffix
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result[1] = suffixes[result[1]] || result[1];
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// Returning Array, Object, or String (default)
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if (output === "array") {
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return result;
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}
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if (output === "exponent") {
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return e;
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}
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if (output === "object") {
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return { value: result[0], suffix: result[1] };
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}
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return result.join(spacer);
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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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} 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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} else {
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global.filesize = filesize;
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}
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})(typeof global !== "undefined" ? global : window); |