在tcp/ip协议中以BigEndian方式的编码与解码

来源：互联网发布：刷屏软件编辑：程序博客网时间：2024/06/05 04:39
package com.tcpip;/** * 在tcp/ip协议中以BigEndian方式的编码与解码 * @author  * */public class BruteForceCoding {private static byte byteVal = 101;private static short shortVal = 10001;private static int intVal = 100000001;private static long longVal = 1000000000001L;private final static int BSIZE = Byte.SIZE;private final static int SSIZE = Short.SIZE;private final static int ISIZE = Integer.SIZE;private final static int LSIZE = Long.SIZE;private final static int BYTEMASK = 0xFF;public static String byteArrayToDecimalString(byte[] bArray){StringBuilder rtn = new StringBuilder();for(byte b:bArray){rtn.append(b&BYTEMASK).append(" ");}return rtn.toString();}/** * 对val进行编码 * @param dst 源字节数组 * @param val 需要编码的long值 * @param offset 编码起始的偏移量 * @param size编码的位数 * @return */public static int encodeIntBigEndian(byte[] dst,long val,int offset,int size){for(int i=0;i<size;i++){dst[offset++] = (byte)(val >> ((size-i-1)*Byte.SIZE));}return offset;}/** * 对字节数组val进行解码 * @param val 源字节数组 * @param offset 解码起始的偏移量 * @param size 解码的位数 * @return */public static long decodeIntBigEndian(byte[] val,int offset,int size){long rtn = 0;for(int i=0;i<size;i++){rtn = (rtn<<Byte.SIZE) | ((long)val[offset+i] & BYTEMASK);}return rtn;}public static void main(String args[]){byte[] message= new byte[BSIZE];int r = encodeIntBigEndian(message,1999999999,0,BSIZE);System.out.println(r);long rl = decodeIntBigEndian(message,0,BSIZE);System.out.println(rl);}}
1 0