Month: March 2012

// function: getBytesWithUnit
// input: bytes (number)
// input: useSI (boolean), if true then uses SI standard (1KB = 1000bytes), otherwise uses IEC (1KiB = 1024 bytes)
// input: precision (number), sets the maximum length of decimal places.
// input: useSISuffix (boolean), if true forces the suffix to be in SI standard. Useful if you want 1KB = 1024 bytes
// returns (string), represents bytes is the most simplified form.
var getBytesWithUnit = function (bytes, useSI, precision, useSISuffix) {
	"use strict";
	if (!(!isNaN(bytes) && +bytes > -1 && isFinite(bytes))) {
		return false;
	}
	var units, obj,	amountOfUnits, unitSelected, suffix;
	units = ['bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
	obj = {
		base : useSI ? 10 : 2,
		unitDegreeDiff : useSI ? 3 : 10
	};
	amountOfUnits = Math.max(0, Math.floor(Math.round(Math.log(+bytes) / Math.log(obj.base) * 1e6) / 1e6));
	unitSelected = Math.floor(amountOfUnits / obj.unitDegreeDiff);
	unitSelected = units.length > unitSelected ? unitSelected : units.length - 1;
	suffix = (useSI || useSISuffix) ? units[unitSelected] : units[unitSelected].replace('B', 'iB');
	bytes = +bytes / Math.pow(obj.base, obj.unitDegreeDiff * unitSelected);
	precision = precision || 3;
	if (bytes.toString().length > bytes.toFixed(precision).toString().length) {
		bytes = bytes.toFixed(precision);
	}
	return bytes + " " + suffix;
};

// function: getBytesWithUnit // input: bytes (number) // input: useSI (boolean), if true then uses SI standard (1KB = 1000bytes), otherwise uses IEC (1KiB = 1024 bytes) // input: precision (number), sets the maximum length of decimal places. // input: useSISuffix (boolean), if true forces the suffix to be in SI standard. Useful if you want 1KB = 1024 bytes // returns (string), represents bytes is the most simplified form. var getBytesWithUnit = function (bytes, useSI, precision, useSISuffix) { "use strict"; if (!(!isNaN(bytes) && +bytes > -1 && isFinite(bytes))) { return false; } var units, obj, amountOfUnits, unitSelected, suffix; units = ['bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']; obj = { base : useSI ? 10 : 2, unitDegreeDiff : useSI ? 3 : 10 }; amountOfUnits = Math.max(0, Math.floor(Math.round(Math.log(+bytes) / Math.log(obj.base) * 1e6) / 1e6)); unitSelected = Math.floor(amountOfUnits / obj.unitDegreeDiff); unitSelected = units.length > unitSelected ? unitSelected : units.length - 1; suffix = (useSI || useSISuffix) ? units[unitSelected] : units[unitSelected].replace('B', 'iB'); bytes = +bytes / Math.pow(obj.base, obj.unitDegreeDiff * unitSelected); precision = precision || 3; if (bytes.toString().length > bytes.toFixed(precision).toString().length) { bytes = bytes.toFixed(precision); } return bytes + " " + suffix; };