public static String readableFileSize(long size) {
if (size <= 0) return "0";
final String[] units = new String[] {"B", "KB", "MB", "GB", "TB"};
int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups))
+ " "
+ units[digitGroups];
}
private long normalizeMax(long l) {
int exp = (int) Math.log10((double) l);
long multiple = (long) Math.pow(10.0, exp);
int i = (int) (l / multiple);
l = (i + 1) * multiple;
return l;
}