package com.base;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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/**
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* Êý¾Ýת»»
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* @author LiJun
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*
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*/
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public class ComBase {
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public static byte changeIntToByte(int data)
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{
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return (byte)(data & 0xFF);
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}
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//------------------------------------------------------------------------------
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public static short changeIntToShort(int data)
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{
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return (short)(data & 0xFFFF);
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}
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//------------------------------------------------------------------------------
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public static byte changeShortToByte(short data)
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{
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return (byte)(data & 0xFF);
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}
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//------------------------------------------------------------------------------
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public static int changeByteToInt(byte data)
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{
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int tmp = data;
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return (tmp & 0xFF);
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}
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//------------------------------------------------------------------------------
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public static int changeShortToInt(short data)
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{
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int tmp = data;
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return (tmp & 0xFFFF);
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}
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//------------------------------------------------------------------------------
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public static double changeShortToDouble(short data)
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{
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int tmp = data & 0xFFFF;
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return (double)(tmp);
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}
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public static int ByteToHex(byte temp1 ,byte temp2) {
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int Rtemp;
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Rtemp = ((temp1 &0xff)<<8) | (temp2 & 0xff);
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return (short)Rtemp;
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}
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public static int ByteToHexxx(byte temp1 ,byte temp2) {
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int Rtemp;
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Rtemp = ((temp1 &0xff)<<8) | (temp2 & 0xff);
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return (int)Rtemp;
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}
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public static int ByteToInt(byte temp1 ,byte temp2,byte temp3 ,byte temp4){
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int Rtemp;
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int Rtemp1,Rtemp2;
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Rtemp = 0;
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Rtemp1 = ByteToHexxx( temp3 ,temp4);
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Rtemp2 = ByteToHexxx( temp1 ,temp2);
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Rtemp= (int)(Rtemp1<<16) +(int)(Rtemp2);
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return Rtemp;
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}
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public static long ByteToLong(byte temp1 ,byte temp2,byte temp3 ,byte temp4){
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long Rtemp;
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long Rtemp1,Rtemp2;
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Rtemp = 0;
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Rtemp1 = ByteToHexxx( temp3 ,temp4);
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Rtemp2 = ByteToHexxx( temp1 ,temp2);
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Rtemp= (int)(Rtemp1<<16) +(int)(Rtemp2);
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return Rtemp;
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}
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public static byte[] IntToByte(int num){
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byte[]bytes=new byte[4];
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bytes[0]=(byte) ((num>>8)&0xff);
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bytes[1]=(byte) ((num)&0xff);
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bytes[2]=(byte) ((num>>24)&0xff);
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bytes[3]=(byte) (num>>16&0xff);
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return bytes;
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}
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public static byte[] LongToByte(long num){
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byte[]bytes=new byte[4];
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bytes[0]=(byte) ((num>>8)&0xff);
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bytes[1]=(byte) ((num)&0xff);
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bytes[2]=(byte) ((num>>24)&0xff);
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bytes[3]=(byte) (num>>16&0xff);
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return bytes;
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}
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public static int my_power_2(int N){
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StringBuffer v = new StringBuffer("");
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long num[] = new long[2];
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num[1] = 1;
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if(N > 62){
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num[0] = 1;
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num[0] = num[0]<<(N - 62);
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num[1] = num[1]<<62;
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String s = String.valueOf(num[1]);
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int size = 30,i = 0,j = 0;
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long n[] = new long[size + 1];
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//System.out.println(num[0]+" "+s);
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for(i = s.length() - 1;i >= 0;-- i){
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n[j ++] = (long) (num[0] * (s.charAt(i) - '0'));
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//System.out.println(n[j - 1]);
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}
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for(i = 0;i < size;++ i){
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while(n[i] > 9){
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n[i + 1] += n[i] / 10;
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n[i] %= 10;
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}
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}
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boolean bl = false;
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for(i = size;i >= 0;-- i){
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if(n[i] != 0 || bl){
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v.append(n[i]);
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bl = true;
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}
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}
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}else{
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num[1] = num[1] << N;
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v.append(String.valueOf(num[1]));
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}
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return Integer.parseInt(v.toString());
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}
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/**
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* »ñÈ¡Êý¾ÝÍ·µÄ³¤¶È
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* @param b
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* @return
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*/
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public static int createPackHeadCount(byte[] b) {
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ByteBuffer bf = ByteBuffer.allocate(b.length);
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bf.order(ByteOrder.LITTLE_ENDIAN);
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bf.put(b);
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bf.flip();
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return ComBase.changeShortToInt(bf.getShort());
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}
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/**
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* ·µ»Ø¼ÆËãºóµÄУÑéÊý×é
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* @param data
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* @return
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*/
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public static byte[] calCheckSum(byte[] data) {
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if(data != null && data.length%2 == 0) {
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//·Ç¿Õ,²¢ÇÒ×Ö½ÚΪżÊý×Ö½Ú
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ByteBuffer bf = ByteBuffer.allocate(data.length+2);
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bf.order(ByteOrder.LITTLE_ENDIAN);
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bf.put(data);
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short sum = 0;
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bf.position(0);
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for(int i = 0;i<data.length/2;i++) {
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sum += bf.getShort()&0xFFFF;
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}
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bf.putShort((short) ((~sum)&0xFFFF));
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data = bf.array();
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}
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return data;
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}
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/**
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* ¼ì²éÊý¾ÝУÑéºÍ
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* @param data
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* @return
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*/
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public static boolean checkPackageSum(byte[] data) {
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boolean flag = false;
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if(data != null && data.length%2==0) {
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ByteBuffer bf = ByteBuffer.allocate(data.length);
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bf.order(ByteOrder.LITTLE_ENDIAN);
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bf.put(data);
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bf.flip();
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short sum = 0 ;
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for(int i = 0;i<bf.limit()/2;i++) {
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sum += bf.getShort()&0xFFFF;
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}
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if((sum&0xFFFF) == 0xFFFF) {
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flag = true;
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}
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}
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return flag;
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}
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/**
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* ¼ì²éÊý¾ÝУÑéºÍ
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* @param buffer
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* @return
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*/
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public static boolean checkByteBufferSum(ByteBuffer buffer) {
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boolean flag = false;
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if(buffer != null && buffer.limit()%2==0) {
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ByteBuffer bf = buffer;
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bf.order(ByteOrder.LITTLE_ENDIAN);
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bf.position(0);
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short sum = 0 ;
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for(int i = 0;i<bf.limit()/2;i++) {
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sum += bf.getShort()&0xFFFF;
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}
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if((sum&0xFFFF) == 0xFFFF) {
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flag = true;
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}
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}
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return flag;
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}
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}
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