package com.gftech.util;



import java.io.DataInputStream;

import java.io.EOFException;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.UnknownHostException;

import java.util.ArrayList;



/**

 * ????????

 * 

 * @author sinboy

 * @version 1.0 2005-9-27

 * 

 */

final public class GFNet {



	/**

	 * ???????IP??

	 * 

	 * @return

	 */

	public static String getLocalHost() {

		String result = null;



		try {

			result = InetAddress.getLocalHost().getHostName() + "/" + InetAddress.getLocalHost().getHostAddress();

		} catch (UnknownHostException e) {

			e.printStackTrace();

		}

		return result;

	}



	/**

	 * ?????????Buffer????

	 * 

	 * @param out

	 *            ???

	 * @param b

	 *            ???????

	 * @throws IOException

	 */

	public static void send(OutputStream out, byte[] b) throws IOException {

		if (out == null)

			throw new IOException();

		if (b != null) {

			try {

				if (b != null) {

					out.write(b);

					out.flush();

				}

			} catch (IOException e) {

				throw e;

			}

		}

	}



	/**

	 * ??????????????

	 * 

	 * @param in

	 *            ???????Buffer????

	 * @param len

	 *            ?????

	 * @return

	 * @throws IOException

	 */

	public static byte[] receive(InputStream in, int len) throws IOException {

		byte[] result = null;



		if (in == null)

			throw new IOException();

		if (len > 0) {

			result = new byte[len];

			in.read(result);

		}

		return result;

	}



	/**

	 * ????????????????

	 * 

	 * @param in

	 *            ???

	 * @return

	 * @throws IOException

	 */

	public static byte[] receive(InputStream in) throws IOException {

		byte[] result = null;



		if (in == null)

			throw new IOException();

		int b;

		ArrayList<Byte> temp = new ArrayList<Byte>();

		while ((b = in.read()) != -1) {

			temp.add((byte) b);

		}



		if (temp.size() > 0) {

			result = new byte[temp.size()];

			for (int i = 0; i < temp.size(); i++)

				result[i] = temp.get(i);

		}



		return result;

	}



	 

	public static final short readUInt8(InputStream in) throws IOException {

		int ch = in.read();

		if (ch < 0) {

			throw new EOFException();

		}

		return (short) (ch & 0xff);

	}



	public static final int readUInt16(InputStream in) throws IOException {

		return (readUInt8(in) + (readUInt8(in) << 8)) & 0xffff;

	}



	public static final int readInt32(InputStream in) throws IOException {

		return readInt32(in, false);

	}



	public static final int readInt32(InputStream in, boolean isHighFirst) throws IOException {

		if (isHighFirst)

			return (readUInt8(in) << 24) + (readUInt8(in) << 16) + (readUInt8(in) << 8) + readUInt8(in);

		else

			return readUInt8(in) + (readUInt8(in) << 8) + (readUInt8(in) << 16) + (readUInt8(in) << 24);

	}



	public static byte[] readBytes(DataInputStream in, int len) throws IOException {

		if (in != null && len > 0) {

			byte[] b = new byte[len];



			for (int i = 0; i < len; i++)

				b[i] = in.readByte();



			return b;

		}



		return null;

	}

	public static final void writeInt8(OutputStream out, int value) throws IOException { 

		  out.write(value);

	}

	

	

	public static final boolean writeInt32(OutputStream out, int value) throws IOException {



		return writeInt32(out, value, false);

	}



	public static final boolean writeInt32(OutputStream out, int value, boolean isHighFirst) throws IOException {

		boolean result = false;



		if (out != null) {

			byte[] b = GFCommon.int2bytes(value, isHighFirst);

			out.write(b);

		}

		return result;

	}



	public static int readInt(DataInputStream in, boolean isBig) throws IOException {

		if (in != null) {

			return in.readInt();

		} else

			throw new IOException();



	}



}