package myVncProxy;

import static org.junit.Assert.*;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.util.Iterator;
import java.util.LinkedList;

import javax.imageio.ImageIO;

import org.junit.Test;

import myVncProxy.MulticastQueue.Client;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
import java.io.OutputStream;

public
class MyRfbProto extends RfbProto {
	final static String versionMsg_3_855 = "RFB 003.855\n";
	/**
	 * CheckMillis is one of new msgType for RFB 3.855. 
	 */
	final static byte SpeedCheckMillis = 4;

	// Secyrity type of OS X
	final static int SecTypeReqAccess = 32;

	// Supported authentication types
	final static int AuthAccess = 32;

	
	
	private static final int INFLATE_BUFSIZE = 1024*100;
	boolean printStatusFlag = false;
	long startCheckTime;

	private int messageType;
	private int rectangles;
	private int rectX;
	private int rectY;
	private int rectW;
	private int rectH;
	private int encoding;
	private int zLen;
	private boolean clicomp = false;

	private ServerSocket servSock;
	protected int acceptPort;
	private byte initData[];
	private LinkedList<Socket> cliListTmp;
	private LinkedList<Socket> cliList;
	boolean createBimgFlag;
	boolean proxyFlag = true;

	ExecutorService executor;

	byte[] pngBytes;

	// private MulticastQueue<LinkedList<ByteBuffer>> multicastqueue = new MostRecentMultiCast<LinkedList<ByteBuffer>>(10);
	private MulticastQueue<LinkedList<ByteBuffer>> multicastqueue = new MulticastQueue<LinkedList<ByteBuffer>>();
	private int clients = 0;
	private Inflater inflater = new Inflater();
	private Deflater deflater = new Deflater();
	private CreateThread geth;
//	private Thread requestThread;
	private RequestScreenThread rThread;
	private Thread requestThread;
	
	public
	MyRfbProto() throws IOException {
	}
	
	MyRfbProto(String h, int p, VncViewer v) throws IOException {
		super(h, p, v);

		rThread = new RequestScreenThread(this); 
		requestThread = new Thread(rThread);
//		requestThread = new Thread(new RequestScreenThread(this));
	}

	MyRfbProto(String h, int p, CreateThread geth) throws IOException {
		super(h, p);
		this.geth = geth;
		proxyFlag = true;

		rThread = new RequestScreenThread(this); 
		requestThread = new Thread(rThread);
//		requestThread = new Thread(new RequestScreenThread(this));
	}
	
	MyRfbProto(String h, int p) throws IOException {
		super(h, p);

		rThread = new RequestScreenThread(this); 
		requestThread = new Thread(rThread);
//		requestThread = new Thread(new RequestScreenThread(this));
	}
	
	// over write
	void writeVersionMsg() throws IOException {
		clientMajor = 3;
		if (serverMinor == 855) {
				clientMinor = 855;
				os.write(versionMsg_3_855.getBytes());
		} else if (serverMajor > 3 || serverMinor >= 8) {
			clientMinor = 8;
			os.write(versionMsg_3_8.getBytes());
		} else if (serverMinor >= 7) {
			clientMinor = 7;
			os.write(versionMsg_3_7.getBytes());
		} else {
			clientMinor = 3;
			os.write(versionMsg_3_3.getBytes());
		}
		protocolTightVNC = false;
		initCapabilities();
	}

	void initServSock(int port) throws IOException {
		servSock = new ServerSocket(port);
		acceptPort = port;
	}
	
	void authenticationRequestAccess() throws IOException {

		byte[] headBuf = new byte[2];
		is.read(headBuf);
		if(headBuf[1] == 2) {
			byte[] b = new byte[258];
			is.read(b);

<<<<<<< local
		byte[] outBuf = new byte[192]; 
		os.write(outBuf);
		os.flush();
=======
			byte[] outBuf = new byte[256];
			os.write(outBuf);
			os.flush();
		}else if(headBuf[1] == 23) {
			byte[] b = new byte[130];
			is.read(b);
			byte[] outBuf = new byte[192];
			os.write(outBuf);
			os.flush();
		}
>>>>>>> other

		int result = readU32();
		if(result != 0) {
			System.out.println("faild authentication  ");
			throw new IOException();
		}
		
		
		
		
	}

	/*
	 *  default port number is 5999. 
	 */
	void selectPort(int p) {
		if(servSock != null ) return ;
		int port = p;
		while (true) {
			try {
				initServSock(port);
				break;
			} catch (BindException e) {
				port++;
				continue;
			} catch (IOException e) {

			}
		}
		System.out.println("accept port = " + port);
	}

	int getAcceptPort() {
		return acceptPort;
	}

	void setSoTimeout(int num) throws IOException {
		servSock.setSoTimeout(num);
	}

	Socket accept() throws IOException {
		return servSock.accept();
	}

	void addSock(Socket sock) {
		cliList.add(sock);
	}

	void addSockTmp(Socket sock) {
		System.out.println("connected " + sock.getInetAddress());
		cliListTmp.add(sock);
	}

	boolean markSupported() {
		return is.markSupported();
	}

	void readServerInit() throws IOException {

		is.mark(255);
		skipBytes(20);
		int nlen = readU32();
		int blen = 20 + 4 + nlen;
		initData = new byte[blen];
		is.reset();

		is.mark(blen);
		readFully(initData);
		is.reset();

		framebufferWidth = readU16();
		framebufferHeight = readU16();
		bitsPerPixel = readU8();
		depth = readU8();
		bigEndian = (readU8() != 0);
		trueColour = (readU8() != 0);
		redMax = readU16();
		greenMax = readU16();
		blueMax = readU16();
		redShift = readU8();
		greenShift = readU8();
		blueShift = readU8();
		byte[] pad = new byte[3];
		readFully(pad);
		int nameLength = readU32();
		byte[] name = new byte[nameLength];
		readFully(name);
		desktopName = new String(name);

		// Read interaction capabilities (TightVNC protocol extensions)
		if (protocolTightVNC) {
			int nServerMessageTypes = readU16();
			int nClientMessageTypes = readU16();
			int nEncodingTypes = readU16();
			readU16();
			readCapabilityList(serverMsgCaps, nServerMessageTypes);
			readCapabilityList(clientMsgCaps, nClientMessageTypes);
			readCapabilityList(encodingCaps, nEncodingTypes);
		}

		inNormalProtocol = true;
	}

	void sendRfbVersion(OutputStream os) throws IOException {
//		os.write(versionMsg_3_8.getBytes());
		os.write(versionMsg_3_855.getBytes());
	}

	int readVersionMsg(InputStream is, OutputStream os) throws IOException {

		byte[] b = new byte[12];

		is.read(b);

		if ((b[0] != 'R') || (b[1] != 'F') || (b[2] != 'B') || (b[3] != ' ')
				|| (b[4] < '0') || (b[4] > '9') || (b[5] < '0') || (b[5] > '9')
				|| (b[6] < '0') || (b[6] > '9') || (b[7] != '.')
				|| (b[8] < '0') || (b[8] > '9') || (b[9] < '0') || (b[9] > '9')
				|| (b[10] < '0') || (b[10] > '9') || (b[11] != '\n')) {
			throw new IOException("Host " + host + " port " + port
					+ " is not an RFB server");
		}

		int rfbMajor = (b[4] - '0') * 100 + (b[5] - '0') * 10 + (b[6] - '0');
		int rfbMinor = (b[8] - '0') * 100 + (b[9] - '0') * 10 + (b[10] - '0');

		if (rfbMajor < 3) {
			throw new IOException(
			"RFB server does not support protocol version 3");
		}

		if (rfbMinor == 855) {
			sendProxyFlag(os);
			if(proxyFlag)sendPortNumber(os);
		}
		return rfbMinor;
	}
	void sendProxyFlag(OutputStream os) throws IOException {
		if(proxyFlag) os.write(1);
		else os.write(0);
	}
	
	boolean readProxyFlag() throws IOException{
		int flag = readU8();
		if(flag == 1)
			return true;
		else
			return false;
	}
	
	void sendPortNumber(OutputStream os) throws IOException {
		byte[] b = new byte[4];
		b = castIntByte(geth.port);
		os.write(b);
	}

	void sendSecurityType(OutputStream os) throws IOException {
		// number-of-security-types
		os.write(1);
		// security-types
		// 1:None
		os.write(1);

/*
 		os.write(4);
		os.write(30);
		os.write(31);
		os.write(32);
		os.write(35);
		os.flush();
*/		
	}

	void readSecType(InputStream is) throws IOException {
		byte[] b = new byte[1];
		is.read(b);
	}


	void readSecType(InputStream is, OutputStream os) throws IOException {
		byte[] b = new byte[1];
		is.read(b);

		int count = 260;
		int[] data = {0, 2, 0, -128, -1, -1, -1, -1, -1, -1, -1, -1, -55, 15, -38, -94, 33, 104, -62, 52, -60, -58, 98, -117, -128, -36, 28, -47, 41, 2, 78, 8, -118, 103, -52, 116, 2, 11, -66, -90, 59, 19, -101, 34, 81, 74, 8, 121, -114, 52, 4, -35, -17, -107, 25, -77, -51, 58, 67, 27, 48, 43, 10, 109, -14, 95, 20, 55, 79, -31, 53, 109, 109, 81, -62, 69, -28, -123, -75, 118, 98, 94, 126, -58, -12, 76, 66, -23, -90, 55, -19, 107, 11, -1, 92, -74, -12, 6, -73, -19, -18, 56, 107, -5, 90, -119, -97, -91, -82, -97, 36, 17, 124, 75, 31, -26, 73, 40, 102, 81, -20, -26, 83, -127, -1, -1, -1, -1, -1, -1, -1, -1, -111, 73, -29, 30, 57, -67, -75, -77, -49, -50, -99, -76, -80, -80, 14, 65, 57, -105, -103, -54, -102, 3, 39, -44, 39, 35, 118, -84, -64, 37, -117, -21, 89, -31, -68, 70, 5, 122, -92, -119, 9, 121, 63, -112, -60, 122, -46, -69, -36, 92, -103, -92, 74, 92, -73, 87, 120, -8, 116, -47, 111, 20, -41, 110, 122, -3, -94, 14, 42, -51, -59, 48, -54, -125, 117, 60, 77, -52, -31, 98, 32, -2, -102, -15, -29, 58, -14, -106, -116, -32, -86, 50, -32, -16, -3, -123, 87, 88, -118, 10, 120, -107, -37, 125, -110, 59, 87, 93, -24, 124, -99, 18, 78, -13, -49, -34, -24, -27, 1, 114, -67, -98, -56, -3, 85, -67, -126, 77};		
		for(int i=0; i<count; i++ ) {
			os.write((byte)data[i]);
			os.flush();
		}
		
		byte[] c = new byte[256];
		is.read(c);
		
		System.out.println(new String(c));

	}

	
	void sendSecResult(OutputStream os) throws IOException {
		byte[] b = castIntByte(0);
		os.write(b);
	}

	void readClientInit(InputStream in) throws IOException {
		byte[] b = new byte[0];
		in.read(b);
	}

	void sendInitData(OutputStream os) throws IOException {
		os.write(initData);
	}


	void sendPngImage() {
		try {
			for (Socket cli : cliListTmp) {
				try {
					sendPngData(cli);
					addSock(cli);
				} catch (IOException e) {
					// if socket closed
					cliListTmp.remove(cli);
				}
			}
			// System.out.println("cliSize="+cliSize());
		} catch (Exception e) {
		}
		cliListTmp.clear();
	}

	boolean ready() throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(is));
		return br.ready();
	}

	int cliSize() {
		return cliList.size();
	}

	void printNumBytesRead() {
		System.out.println("numBytesRead=" + numBytesRead);
	}


	
	void regiFramebufferUpdate() throws IOException {
		is.mark(20);
		messageType = readU8();   // 0
		skipBytes(1);                    // 1
		rectangles = readU16();     //  2
		rectX = readU16();            //  4  
		rectY = readU16();            //  6
		rectW = readU16();           //  8
		rectH = readU16();           //  10
		encoding = readU32();      //   12
//		System.out.println("encoding = "+encoding);
		if (encoding == EncodingZRLE|| encoding==EncodingZRLEE||encoding==EncodingZlib)
			zLen = readU32();
		else
			zLen = 0;
		is.reset();

	}

	int checkAndMark() throws IOException {
		int dataLen;
		switch (encoding) {
		case RfbProto.EncodingRaw:
			dataLen = rectW * rectH * 4 + 16;
//			is.mark(dataLen);
			break;
		case RfbProto.EncodingCopyRect:
			dataLen = 16 + 4;
//			is.mark(dataLen);
			break;
		case RfbProto.EncodingRRE:
		case RfbProto.EncodingCoRRE:
		case RfbProto.EncodingHextile:
		case RfbProto.EncodingTight:
			dataLen = zLen + 20;
//			is.mark(dataLen);
			break;
		case RfbProto.EncodingZlib:
		case RfbProto.EncodingZRLE:
		case RfbProto.EncodingZRLEE:
			dataLen = zLen + 20;
			//			is.mark(dataLen);
			break;
		case RfbProto.EncodingXCursor:
		case RfbProto.EncodingRichCursor:
			int pixArray = rectW * rectH * 4;
			int u8Array = (int)Math.floor((rectW + 7)/8) * rectH; 
			dataLen = pixArray + u8Array;
			printFramebufferUpdate();
//			is.mark(dataLen);
			break;
		default:
			dataLen = 1000000;
//			is.mark(dataLen);
		}
		return dataLen;
	}
	

	void sendDataToClient() throws Exception {
		regiFramebufferUpdate();
//		printFramebufferUpdate();
		int dataLen = checkAndMark();
		readSendData(dataLen);		
	}

	BufferedImage createBufferedImage(Image img) {
		BufferedImage bimg = new BufferedImage(img.getWidth(null),
				img.getHeight(null), BufferedImage.TYPE_INT_RGB);

		Graphics g = bimg.getGraphics();
		g.drawImage(img, 0, 0, null);
		g.dispose();
		return bimg;
	}

	void createPngBytes(BufferedImage bimg) throws IOException {
		pngBytes = getImageBytes(bimg, "png");
	}

	byte[] getBytes(BufferedImage img) throws IOException {
		byte[] b = getImageBytes(img, "png");
		return b;
	}

	byte[] getImageBytes(BufferedImage image, String imageFormat)
			throws IOException {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		BufferedOutputStream os = new BufferedOutputStream(bos);
		image.flush();
		ImageIO.write(image, imageFormat, os);
		os.flush();
		os.close();
		return bos.toByteArray();
	}

	void sendPngData(Socket sock) throws IOException {
		byte[] dataLength = castIntByte(pngBytes.length);
		sock.getOutputStream().write(dataLength);
		sock.getOutputStream().write(pngBytes);
	}

	byte[] castIntByte(int len) {
		byte[] b = new byte[4];
		b[0] = (byte) ((len >>> 24) & 0xFF);
		b[1] = (byte) ((len >>> 16) & 0xFF);
		b[2] = (byte) ((len >>> 8) & 0xFF);
		b[3] = (byte) ((len >>> 0) & 0xFF);
		return b;
	}

	BufferedImage createBimg() throws IOException {
		BufferedImage bimg = ImageIO.read(new ByteArrayInputStream(pngBytes));
		return bimg;
	}

	void printFramebufferUpdate() {

		System.out.println("messageType=" + messageType);
		System.out.println("rectangles=" + rectangles);
		System.out.println("encoding=" + encoding);
		System.out.println("rectX = "+rectX+": rectY = "+rectY);
		System.out.println("rectW = "+rectW+": rectH = "+rectH);
		switch (encoding) {
		case RfbProto.EncodingRaw:
			System.out.println("rectW * rectH * 4 + 16 =" + rectW * rectH * 4
					+ 16);
			break;
		default:
		}
	}
	int returnMsgtype() {
		return messageType;
	}
	
	
	void readSpeedCheck() throws IOException {
		byte[] b = new byte[1];
		readFully(b);
	}
	
	void startSpeedCheck() {
		ByteBuffer b = ByteBuffer.allocate(10);
		b.put((byte)SpeedCheckMillis);
		b.flip();
		startCheckTime = System.currentTimeMillis();
		System.out.println("startChckTime = "+ startCheckTime);
		LinkedList<ByteBuffer>bufs = new LinkedList<ByteBuffer>();
		bufs.add(b);
		multicastqueue.put(bufs);
	}

	void endSpeedCheck() {
		long accTime = System.currentTimeMillis();
		long time = accTime - startCheckTime;
		System.out.println("checkMillis: " + time);
	}


	synchronized void changeStatusFlag() {
		printStatusFlag = true;
	}

	void printMills() {
		if(printStatusFlag) {

			changeStatusFlag();
		} else {
			changeStatusFlag();
		}
	}
	
	void speedCheckMillis() {
			Runnable stdin = new Runnable() {
			public void run() {
				int c;
				try {
					while( (c = System.in.read()) != -1 ) {
						switch(c) {
							case 's':
								break;
							default:
								startSpeedCheck();
								break;
						}
					}
				}catch(IOException e){
					System.out.println(e);
				}
			}
		};
		
		new Thread(stdin).start();
	}
	
	void requestThreadStart() {
		requestThread.start();
	}

	public synchronized void requestThreadNotify() {
		rThread.reStart();
	}
	

	/**
	 * gzip byte arrays
	 * @param deflater
	 * @param inputs
	 *            byte data[]
	 * @param inputIndex 
	 * @param outputs
	 *            byte data[]
	 * @return  byte length in last byte array
	 * @throws IOException
	 */
	public int zip(Deflater deflater,LinkedList<ByteBuffer> inputs, int inputIndex, LinkedList<ByteBuffer> outputs) throws IOException {
		int len = 0;
		ByteBuffer c1= ByteBuffer.allocate(INFLATE_BUFSIZE);
		while(inputIndex < inputs.size() ) {
			ByteBuffer b1 = inputs.get(inputIndex++);
			deflater.setInput(b1.array(),b1.position(),b1.remaining());
			/**
			 * If we finish() stream and reset() it, Deflater start new gzip stream, this makes continuous zlib reader unhappy.
			 * if we remove finish(), Deflater.deflate() never flushes its output. The original zlib deflate has flush flag. I'm pretty
			 * sure this a kind of bug of Java library.
			 */
			if (inputIndex==inputs.size())	
				deflater.finish();
			int len1 = 0;
			do {
				len1 = deflater.deflate(c1.array(),c1.position(),c1.remaining());
				if (len1>0) {
					len += len1;
					c1.position(c1.position()+len1); 
					if (c1.remaining()==0) {
						c1.flip();	outputs.addLast(c1);
						c1 = ByteBuffer.allocate(INFLATE_BUFSIZE);
					}
				}
			} while (len1 >0 || !deflater.needsInput()); // &&!deflater.finished());
		}
		if (c1.position()!=0) {
			c1.flip();	outputs.addLast(c1);
		}
		deflater.reset();
		return len;
	}
	
	/**
	 * gunzip byte arrays
	 * @param inflater
	 * @param inputs
	 *            byte data[]
	 * @param outputs
	 *            byte data[]
	 *@return  number of total bytes            
	 * @throws IOException
	 */
	public int unzip(Inflater inflater, LinkedList<ByteBuffer> inputs, int inputIndex, LinkedList<ByteBuffer> outputs,int bufSize)
																	throws DataFormatException {
		int len=0;
		ByteBuffer buf = ByteBuffer.allocate(bufSize);
		while (inputIndex < inputs.size()) {
			ByteBuffer input = inputs.get(inputIndex++);
			inflater.setInput(input.array(),input.position(),input.limit());
//			if (inputIndex==inputs.size())	    if inflater/deflater has symmetry, we need this
//				inflater.end();                         but this won't work
			do {
				int len0 = inflater.inflate(buf.array(),buf.position(),buf.remaining());
				if (len0>0) {
					buf.position(buf.position()+len0);
					len += len0;
					if (buf.remaining()==0) {
						buf.flip();
						outputs.addLast(buf);
						buf = ByteBuffer.allocate(bufSize);
					}
				}
			} while (!inflater.needsInput());
		} 
		if (buf.position()!=0) {
			buf.flip();
			outputs.addLast(buf);
		}
		return len;
	}

	
	float maxMag = 1;
	/**
	 * send data to clients
	 * @param dataLen
	 * @throws IOException
	 * @throws DataFormatException
	 * 
	 * Zlibed packet is compressed in context dependent way, that is, it have to send from the beginning. But this is
	 * impossible. So we have to compress it again for each clients. Separate deflater for each clients is necessary. 
	 * 
	 * Java's deflater does not support flush. This means to get the result, we have to finish the compression. Reseting
	 * start new compression, but it is not accepted well in zlib continuous reading. So we need new Encoding ZRLEE
	 * which reset decoder for each packet. ZRLEE can be invisible from user, but it have to be implemented in the clients.
	 * ZRLEE compression is not context dependent, so no recompression is necessary.
	 */
	void readSendData(int dataLen) throws IOException, DataFormatException {
		LinkedList<ByteBuffer>bufs = new LinkedList<ByteBuffer>();
		ByteBuffer header = ByteBuffer.allocate(16);
		readFully(header.array(),0,16); 
		header.limit(16);
		if (header.get(0)==RfbProto.FramebufferUpdate) {
			int encoding = header.getInt(12);
			if (encoding==RfbProto.EncodingZRLE||encoding==RfbProto.EncodingZlib) { // ZRLEE is already recompressed
				ByteBuffer len = ByteBuffer.allocate(4);
				readFully(len.array(),0,4); len.limit(4);
				ByteBuffer inputData = ByteBuffer.allocate(dataLen-20);

				startTiming();
				readFully(inputData.array(),0,inputData.capacity()); inputData.limit(dataLen-20);
				stopTiming();

				LinkedList<ByteBuffer>inputs = new LinkedList<ByteBuffer>();
				inputs.add(inputData);

				header.putInt(12, RfbProto.EncodingZRLEE); // means recompress every time
				// using new Deflecter every time is incompatible with the protocol, clients have to be modified.
				Deflater nDeflater = deflater; // new Deflater();
				LinkedList<ByteBuffer> out = new LinkedList<ByteBuffer>();
				unzip(inflater, inputs, 0 , out, INFLATE_BUFSIZE);
				// dump32(inputs);
				int len2 = zip(nDeflater, out, 0, bufs);
				ByteBuffer blen = ByteBuffer.allocate(4); blen.putInt(len2); blen.flip();
				bufs.addFirst(blen);

				bufs.addFirst(header);
				multicastqueue.put(bufs);
//				is.reset();

/*
				System.out.println("ZRLE = "+dataLen);
				System.out.println("ZRLEE = "+(len2+20));
				float mag = (float)dataLen /  (float)(len2 + 20);
				System.out.println("ZRLE / ZRLEE = "+ mag);
				if(mag > maxMag) maxMag = mag;
				System.out.println("maxMag = "+maxMag);
*/				
				return ;
			}
		bufs.add(header);
		if (dataLen>16) {
			ByteBuffer b = ByteBuffer.allocate(dataLen-16);
			startTiming();
			readFully(b.array(),0,dataLen-16); b.limit(dataLen-16);
			stopTiming();
			bufs.add(b);
		}
		multicastqueue.put(bufs);
//		is.reset();
		return ;
		}
	is.reset();

		// It may be compressed. We can inflate here to avoid repeating clients decompressing here,
		// but it may generate too many large data. It is better to do it in each client.
		// But we have do inflation for all input data, so we have to do it here.
	}

	void newClient(AcceptThread acceptThread, final Socket newCli,
			final OutputStream os, final InputStream is) throws IOException {
		// createBimgFlag = true;
		// rfb.addSockTmp(newCli);
		//		addSock(newCli);
		final int myId = clients; 
		final Client <LinkedList<ByteBuffer>> c = multicastqueue.newClient();
		final AtomicInteger writerRunning = new AtomicInteger();
		writerRunning.set(1);
		/**
		 * Timeout thread. If a client is suspended, it has top of queue indefinitely, which caused memory
		 * overflow. After the timeout, we poll the queue and discard it. Start long wait if writer is running.
		 */
		final Runnable timer = new Runnable() {
			public void run() {
				int count = 0;
				for(;;) {
					long timeout = 30000/8;
					try {
						synchronized(this) {
							int state,flag;
							writerRunning.set(0);
							wait(timeout);
							flag = 0;
							while((state=writerRunning.get())==0) {
								c.poll(); // discard, should be timeout
								count++;
								if (flag==0) {
									System.out.println("Discarding "+myId + " count="+ count); flag = 1;
								}
								wait(10); // if this is too short, writer cannot take the poll, if this is too long, memory will overflow...
							}
							if (flag==1) System.out.println("Resuming "+myId + " count="+count);
							if (state!=1) {
								System.out.println("Client died "+myId);
								break;
							}
						}
					} catch (InterruptedException e) {
					}
				}
			}
		};
		new Thread(timer).start();
		/**
		 * discard all incoming from clients
		 */
		final Runnable reader = new Runnable() {
			public void run() {
				byte b[] = new byte[4096];
				for(;;) {
					try {
						int c = is.read(b);
						if (c<=0) throw new IOException();
						// System.out.println("client read "+c);
					} catch (IOException e) {
						try {
							writerRunning.set(2);
							os.close();
							is.close();
						} catch (IOException e1) {
						}
						return;
					}
				}
			}
		};
		/**
		 * send packets to a client
		 */
		Runnable sender = new Runnable() {
			public void run() {
				writerRunning.set(1);
				try {
					requestThreadNotify();

					/**
					 *  initial connection of RFB protocol
					 */
					sendRfbVersion(os);
//					readVersionMsg(is);
					int rfbMinor = readVersionMsg(is,os);
					sendSecurityType(os);
					readSecType(is);
					sendSecResult(os);
					readClientInit(is);
					sendInitData(os);
					new Thread(reader).start(); // discard incoming packet here after.
//					writeFramebufferUpdateRequest(0,0, framebufferWidth, framebufferHeight, false );
					for (;;) {
						LinkedList<ByteBuffer> bufs = c.poll();
						int inputIndex = 0;
						ByteBuffer header = bufs.get(inputIndex);
						if (header==null) continue;
						if (header.get(0)==RfbProto.FramebufferUpdate) {
							// System.out.println("client "+ myId);
						}
						writeToClient(os, bufs, inputIndex);
						writerRunning.set(1);  // yes my client is awaking.
					}
				} catch (IOException e) {
					try {
						writerRunning.set(2);
						os.close();
					} catch (IOException e1) {
					}
					/* if socket closed 	cliList.remove(newCli); */
				}
			}

			public void writeToClient(final OutputStream os,
					LinkedList<ByteBuffer> bufs, int inputIndex)
					throws IOException {
				while(inputIndex < bufs.size()) {
					ByteBuffer b = bufs.get(inputIndex++);
					os.write(b.array(), b.position(), b.limit());
				}
				os.flush();
			}
		};
		clients++;
		new Thread(sender).start();

	}


	public void dump32(LinkedList<ByteBuffer>bufs) {
		int len =0;
		for(ByteBuffer b: bufs) 	len += b.remaining();
		ByteBuffer top = bufs.getFirst();
		ByteBuffer end = bufs.getLast();
		System.err.println("length: "+len);
		System.err.print("head 0: ");
		for(int i = 0; i<16 && i < top.remaining(); i++) {
			System.err.print(" "+ top.get(i));
		}			
		System.err.print("tail 0: ");
		for(int i = 0; i<16 && i < end.remaining(); i++) {
			System.err.print(" "+end.get(i));
		}
		System.err.println();
	}

	@Test
	public void test1() {
		try {
			LinkedList<ByteBuffer> in = new LinkedList<ByteBuffer>();
			LinkedList<ByteBuffer> out = new LinkedList<ByteBuffer>();
			LinkedList<ByteBuffer> out2 = new LinkedList<ByteBuffer>();
//			if (false) {
//			for(int i=0;i<10;i++) {
//				in.add(ByteBuffer.wrap("test1".getBytes()));
//				in.add(ByteBuffer.wrap("test2".getBytes()));
//				in.add(ByteBuffer.wrap("test3".getBytes()));
//				in.add(ByteBuffer.wrap("test44".getBytes()));
//			}
//			} else 
			{
				String t = "";
				for(int i=0;i<10;i++) {
					t += "test1";
					t += "test2";
					t += "test3";
					t += "test44";
				}
				in.add(ByteBuffer.wrap(t.getBytes()));
			}
			
			LinkedList<ByteBuffer> in1 = clone(in);

			Deflater deflater = new Deflater();
			zip(deflater,in,0,out);
			// LinkedList<ByteBuffer> out3 = clone(out);   zipped result is depend on deflator's state
			unzip(inflater, out, 0,out2, INFLATE_BUFSIZE);
		    // inflater.reset();
			equalByteBuffers(in1, out2);
			LinkedList<ByteBuffer> out4 = new LinkedList<ByteBuffer>();
			deflater = new Deflater();
			zip(deflater,out2,0,out4);
			LinkedList<ByteBuffer> out5 = new LinkedList<ByteBuffer>();
			unzip(inflater,out4,0, out5, INFLATE_BUFSIZE);
			int len = equalByteBuffers(in1,out5);
			
			System.out.println("Test Ok. "+len);
		} catch (Exception e) {
			assertEquals(0,1);
		}
	}

	private LinkedList<ByteBuffer> clone(LinkedList<ByteBuffer> in) {
		LinkedList<ByteBuffer> copy = new LinkedList<ByteBuffer>();
		for(ByteBuffer b: in) {
			ByteBuffer c = b.duplicate();
			copy.add(c);
		}
		return copy;
	}


	
	public int equalByteBuffers(LinkedList<ByteBuffer> in,
			LinkedList<ByteBuffer> out2) {
		int len = 0;
		Iterable<Byte> i = byteBufferIterator(in);
		Iterator<Byte> o = byteBufferIterator(out2).iterator();

		for(int b: i) {
			len ++;
			if (o.hasNext()) {
				int c = o.next();
				assertEquals(b,c);
			} else 
				assertEquals(0,1);
		}
		if (o.hasNext()) 
			assertEquals(0,1);
		// System.out.println();
		return len;
	}

	private Iterable<Byte> byteBufferIterator(final LinkedList<ByteBuffer> in) {
		return new Iterable<Byte>() {
			public Iterator<Byte> iterator() {
				return new Iterator<Byte>() {
					int bytes = 0;
					int buffers = 0;
					public boolean hasNext() {
						for(;;) {
							if (buffers>=in.size()) return false;
							ByteBuffer b = in.get(buffers);
							if (! (bytes<b.remaining())) {
								buffers ++; bytes=0;
							} else return true;
						}
					}
					public Byte next() {
						ByteBuffer bf =in.get(buffers); 
						byte b = bf.get(bytes++); 
						if (bf.remaining()<=bytes) {
							buffers++;
							bytes = 0;
						}
						// System.out.print(b);
						return b;
					}
					public void remove() {
					}
				};
			}
		};
	}

}