add unit type for bytes

pdb-utils/src/main/java/org/lucares/utils/HumanBytes.java

@@ -0,0 +1,32 @@
+package org.lucares.utils;
+
+import java.util.List;
+
+public class HumanBytes {
+
+    public static final long KB = 1024;
+
+    public static final long MB = KB * 1024;
+
+    public static final long GB = MB * 1024;
+
+    public static final long TB = GB * 1024;
+
+    public static final long PB = TB * 1024;
+
+    public static final long EB = TB * 1024;
+
+    public static String toHumanBytes(final long bytes) {
+        final List<String> powers = List.of("bytes", "KB", "MB", "GB", "TB", "PB", "EB");
+
+        int power = 1;
+        String result = String.format("%d bytes", bytes);
+        while (bytes >= Math.pow(1024, power) && power < powers.size()) {
+            result = String.format("%.3f", bytes / Math.pow(1024, power));
+            result = result.replaceAll("\\.?0*$", "");
+            result = result + " " + powers.get(power);
+            power = power + 1;
+        }
+        return result;
+    }
+}