Retrives a friendly formated byte count

Utils.java

/**
 * Retrieves the friendly format of the number of bytes.<br>
 * Is possible to convert it using decimal base, applying <b>International System of Units (SI)</b>, or binary system.
 * As result you get:
 * <ul>
 * <li>Following SI: 1 kB, 1 MB, 1 GB, 1 TB, 1 PB e 1 EB</li>
 * <li>Binary system: 1 KiB, 1 MiB, 1 GiB, 1 TiB, 1 PiB, e 1 EiB</li>
 * </ul>
 * References:
 * <ul>
 * <li><a href="https://en.wikipedia.org/wiki/Byte">Wiki - Byte</a></li>
 * <li><a href="https://en.wikipedia.org/wiki/International_System_of_Units">Wiki - International System of Units (SI)</a></li>
 * </ul>
 * 
 * @param internationalSystemUnits Identifies the use of International System of Units (SI).
 * @param bytes Number of bytes.
 * @return Formatted amount of bytes.
 */
public static String friendlyByteCount(boolean internationalSystemUnits, long bytes)
{
  int base;
  String prefix;
  String friendly;
  if (internationalSystemUnits)
  {
    //International System of Units (SI) uses decimal base
    base = 1000;
  }
  else
  {
    base = 1024;
  }
  
  if (bytes < base)
  {
    friendly = bytes + " B";
  }
  else
  {
    int log = (int)(Math.log(bytes) / Math.log(base));
    
    if (internationalSystemUnits)
    {
      prefix = "kMGTPE".charAt(log - 1) + "B";
    }
    else
    {
      prefix = "KMGTPE".charAt(log - 1) + "iB";
    }
    
    double count = bytes / Math.pow(base, log);
    friendly = (count + " " + prefix);
  }
  
  return friendly;
}