/** | |
* filesize | |
* | |
* @copyright 2018 Jason Mulligan <jason.mulligan@avoidwork.com> | |
* @license BSD-3-Clause | |
* @version 3.6.1 | |
*/ | |
(function (global) { | |
const b = /^(b|B)$/, | |
symbol = { | |
iec: { | |
bits: ["b", "Kib", "Mib", "Gib", "Tib", "Pib", "Eib", "Zib", "Yib"], | |
bytes: ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"] | |
}, | |
jedec: { | |
bits: ["b", "Kb", "Mb", "Gb", "Tb", "Pb", "Eb", "Zb", "Yb"], | |
bytes: ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"] | |
} | |
}, | |
fullform = { | |
iec: ["", "kibi", "mebi", "gibi", "tebi", "pebi", "exbi", "zebi", "yobi"], | |
jedec: ["", "kilo", "mega", "giga", "tera", "peta", "exa", "zetta", "yotta"] | |
}; | |
/** | |
* filesize | |
* | |
* @method filesize | |
* @param {Mixed} arg String, Int or Float to transform | |
* @param {Object} descriptor [Optional] Flags | |
* @return {String} Readable file size String | |
*/ | |
function filesize (arg, descriptor = {}) { | |
let result = [], | |
val = 0, | |
e, base, bits, ceil, full, fullforms, neg, num, output, round, unix, separator, spacer, standard, symbols; | |
if (isNaN(arg)) { | |
throw new Error("Invalid arguments"); | |
} | |
bits = descriptor.bits === true; | |
unix = descriptor.unix === true; | |
base = descriptor.base || 2; | |
round = descriptor.round !== void 0 ? descriptor.round : unix ? 1 : 2; | |
separator = descriptor.separator !== void 0 ? descriptor.separator || "" : ""; | |
spacer = descriptor.spacer !== void 0 ? descriptor.spacer : unix ? "" : " "; | |
symbols = descriptor.symbols || descriptor.suffixes || {}; | |
standard = base === 2 ? descriptor.standard || "jedec" : "jedec"; | |
output = descriptor.output || "string"; | |
full = descriptor.fullform === true; | |
fullforms = descriptor.fullforms instanceof Array ? descriptor.fullforms : []; | |
e = descriptor.exponent !== void 0 ? 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; | |
} | |
// Determining the exponent | |
if (e === -1 || isNaN(e)) { | |
e = Math.floor(Math.log(num) / Math.log(ceil)); | |
if (e < 0) { | |
e = 0; | |
} | |
} | |
// Exceeding supported length, time to reduce & multiply | |
if (e > 8) { | |
e = 8; | |
} | |
// Zero is now a special case because bytes divide by 1 | |
if (num === 0) { | |
result[0] = 0; | |
result[1] = unix ? "" : symbol[standard][bits ? "bits" : "bytes"][e]; | |
} else { | |
val = num / (base === 2 ? Math.pow(2, e * 10) : Math.pow(1000, e)); | |
if (bits) { | |
val = val * 8; | |
if (val >= ceil && e < 8) { | |
val = val / ceil; | |
e++; | |
} | |
} | |
result[0] = Number(val.toFixed(e > 0 ? round : 0)); | |
result[1] = base === 10 && e === 1 ? bits ? "kb" : "kB" : symbol[standard][bits ? "bits" : "bytes"][e]; | |
if (unix) { | |
result[1] = standard === "jedec" ? result[1].charAt(0) : e > 0 ? result[1].replace(/B$/, "") : result[1]; | |
if (b.test(result[1])) { | |
result[0] = Math.floor(result[0]); | |
result[1] = ""; | |
} | |
} | |
} | |
// Decorating a 'diff' | |
if (neg) { | |
result[0] = -result[0]; | |
} | |
// Applying custom symbol | |
result[1] = symbols[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], symbol: result[1]}; | |
} | |
if (full) { | |
result[1] = fullforms[e] ? fullforms[e] : fullform[standard][e] + (bits ? "bit" : "byte") + (result[0] === 1 ? "" : "s"); | |
} | |
if (separator.length > 0) { | |
result[0] = result[0].toString().replace(".", separator); | |
} | |
return result.join(spacer); | |
} | |
// Partial application for functional programming | |
filesize.partial = opt => arg => filesize(arg, opt); | |
// CommonJS, AMD, script tag | |
if (typeof exports !== "undefined") { | |
module.exports = filesize; | |
} else if (typeof define === "function" && define.amd) { | |
define(() => { | |
return filesize; | |
}); | |
} else { | |
global.filesize = filesize; | |
} | |
}(typeof window !== "undefined" ? window : global)); |