source: java/installer2/src/net/oni2/aeinstaller/backend/SizeFormatter.java

package net.oni2.aeinstaller.backend;

/**
 * @author Christian Illy
 */
public class SizeFormatter {
        /**
         * @param sizeVal
         *            Size in Byte
         * @param digits
         *            Number of digits
         * @return Formatted value
         */
        public static String format(long sizeVal, int digits) {
                String names[] = { "B", "KiB", "MiB", "GiB", "TiB" };
                int nameInd = 0;
                float size = sizeVal;
                while ((size > 1024) && (nameInd < (names.length - 1))) {
                        nameInd++;
                        size /= 1024;
                }
                if (size < 10)
                        return String.format(
                                        "%1." + String.valueOf(Math.max(digits - 1, 0)) + "f %s",
                                        size, names[nameInd]);
                else if (size < 100)
                        return String.format(
                                        "%1." + String.valueOf(Math.max(digits - 2, 0)) + "f %s",
                                        size, names[nameInd]);
                else
                        return String.format(
                                        "%1." + String.valueOf(Math.max(digits - 3, 0)) + "f %s",
                                        size, names[nameInd]);
        }
}