c.update("IDAT".getBytes());
bytePos = writeBytes( compressedLines, nCompressed, bytePos );
crc.update( compressedLines, 0, nCompressed );

crcValue = crc.getValue();
bytePos = writeInt4( (int) crcValue, bytePos );
scrunch.finish();
return true;
}
catch (IOException e)
{
System.err.println( e.toString());
return false;
}
}

/**
* Write a PNG "IEND" chunk into the pngBytes array.
*/
protected void writeEnd()
{
bytePos = writeInt4( 0, bytePos );
bytePos = writeString( "IEND", bytePos );
crc.reset();
crc.update("IEND".getBytes());
crcValue = crc.getValue();
bytePos = writeInt4( (int) crcValue, bytePos );
}
}