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;
/**
* ��������صIJ���
*
* @author sinboy
* @version 1.0 2005-9-27
*
*/
final public class GFNet {
/**
* �õ�����������IP��ַ
*
* @return
*/
public static String getLocalHost() {
String result = null;
try {
result = InetAddress.getLocalHost().getHostName() + "/" + InetAddress.getLocalHost().getHostAddress();
} catch (UnknownHostException e) {
e.printStackTrace();
}
return result;
}
/**
* �������ݣ����ʹ��Buffer���а�װ
*
* @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;
}
}
}
/**
* ����ָ�����ȵ�ԭʼ�ֽ����ݡ�
*
* @param in
* �������������Buffer���а�װ
* @param len
* ���յij���
* @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;
}
/**
* ���������ж�ȡ����ֱ��������Ϊֹ
*
* @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();
}
}