code: private void parseFlags(byte[] flags) throws ID3v2FormatException
  	{
  		if (flags.length != FRAME_FLAGS_SIZE)
  		{
  			throw new ID3v2FormatException("Error parsing flags of frame: " + id + ".  Expected 2 bytes.");
  		}
  		else
  		{
  			tagAlterDiscard = (flags[0]&0x40)!=0;
  			fileAlterDiscard = (flags[0]&0x20)!=0;
  			readOnly = (flags[0]&0x10)!=0;
  			grouped = (flags[1]&0x40)!=0;
  			compressed = (flags[1]&0x08)!=0;
  			encrypted = (flags[1]&0x04)!=0;
  			unsynchronised = (flags[1]&0x02)!=0;
  			lengthIndicator = (flags[1]&0x01)!=0;
  
  			if (compressed && !lengthIndicator)
  			{
  				throw new ID3v2FormatException("Error parsing flags of frame: " + id + ".  Compressed bit set without data length bit set.");
  			}
  		}
  	}
docs: Read the information from the flags array.
  
  @param flags the flags found in the frame header
  @exception ID3v2FormatException if an error occurs