public UnixOwnersHeader(SubBlockHeader sb, byte[] uoHeader) {
   super(sb);
   int pos = 0;
   ownerNameSize = Raw.readShortLittleEndian(uoHeader, pos) & 0xFFFF;
   pos += 2;
   groupNameSize = Raw.readShortLittleEndian(uoHeader, pos) & 0xFFFF;
   pos += 2;
   if (pos + ownerNameSize < uoHeader.length) {
     byte[] ownerBuffer = new byte[ownerNameSize];
     System.arraycopy(uoHeader, pos, ownerBuffer, 0, ownerNameSize);
     owner = new String(ownerBuffer);
   }
   pos += ownerNameSize;
   if (pos + groupNameSize < uoHeader.length) {
     byte[] groupBuffer = new byte[groupNameSize];
     System.arraycopy(uoHeader, pos, groupBuffer, 0, groupNameSize);
     group = new String(groupBuffer);
   }
 }
 public int getSummFreq() {
   return Raw.readShortLittleEndian(mem, pos) & 0xffff;
 }