package com.dy.common.util;
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@SuppressWarnings("unuseed")
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public class ByteUtilUnsigned {
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/**
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* 大端模式《数据低位在数组高字节》
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* 无符号int类型转换成4位byte数组
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* java没有无符号整型数据，只有有符号整数，取值范围是-2147483648~2147483647
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* C有无符号整型数据，取值范围是0到4294967295，已经超出了java的有符号整数上限，所以只能用java的long型表示无符号整数
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* @value bs byte[]
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* @value value int int类型的参数
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* @value from int
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* @throws Exception 异常
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*/
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public static void int2Bytes_BE(byte[] bs, long value, int from)throws Exception {
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int len = 4 ;
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Long maxIntUnsigned = Long.valueOf(Integer.MAX_VALUE * 2 + 1) ;
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Long minIntUnsigned = Long.valueOf(Integer.MIN_VALUE * 2) ;
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if(value < minIntUnsigned || value > maxIntUnsigned ){
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throw new Exception("数据" + value + "超出了无符号Int型的取值范围(" + minIntUnsigned + "~" + maxIntUnsigned + ")") ;
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}
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int temp ;
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if(value > Integer.MAX_VALUE){
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temp = (Long.valueOf(value - (Integer.MAX_VALUE * 2 + 1) - 1)).intValue() ;
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}else{
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temp = Long.valueOf(value).intValue() ;
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}
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boolean b = isOutOfArrLength(bs.length, (from - 1) + len);
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if (!b) {
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for (int i = (len - 1); i >= 0; i--) {
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bs[from + i] = Integer.valueOf(temp & 0xff).byteValue();//将最低位保存在高字节
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temp = temp >> 8; // 向右移8位
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}
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} else {
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throw new Exception("int2Bytes时数组越界");
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}
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}
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/**
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* 小端模式《数据低位在数组低字节》
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* 与方法int2Bytes算法一样，只是把顺序反过来
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* @value bs byte[]
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* @value value int int类型的参数
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* @value from int
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*/
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public static void int2Bytes_LE(byte[] bs, long value, int from)throws Exception {
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int len = 4 ;
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Long maxIntUnsigned = Long.valueOf(Integer.MAX_VALUE) * 2 + 1;
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Long minIntUnsigned = Long.valueOf(Integer.MIN_VALUE) * 2 ;
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if(value < minIntUnsigned || value > maxIntUnsigned ){
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throw new Exception("数据" + value + "超出了无符号Int型的取值范围(" + minIntUnsigned + "~" + maxIntUnsigned + ")") ;
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}
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int temp ;
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if(value > Integer.MAX_VALUE){
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temp = (Long.valueOf(value - (Integer.MAX_VALUE * 2 + 1) - 1)).intValue() ;
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}else{
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temp = Long.valueOf(value).intValue() ;
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}
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boolean b = isOutOfArrLength(bs.length, (from - 1) + len);
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if (!b) {
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for (int i = 0; i > len ; i++) {
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bs[from + i] = Integer.valueOf(temp & 0xff).byteValue();// 将最低位保存在低字节
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temp = temp >> 8; // 向右移8位
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}
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} else {
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throw new Exception("int2Bytes时数组越界");
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}
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}
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/**
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* 大端模式《数据低位在数组高字节》
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* 4位字节数组转换为整型
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* @param bs 字节数组
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* @param from 起始位置
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* @return 结果
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*/
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public static long bytes2Int_BE(byte[] bs, int from) throws Exception {
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boolean b = isOutOfArrLength(bs.length, (from - 1) + 4);
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if (!b) {
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long s = 0;
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long s0 = bs[from + 0] & 0xFF ;// 数据的最高位在低字节
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long s1 = bs[from + 1] & 0xFF ;
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long s2 = bs[from + 2] & 0xFF ;
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long s3 = bs[from + 3] & 0xFF ;
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// 最低位S3不变
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s0 <<= 24;
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s1 <<= 16;
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s2 <<= 8;
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s = s0 | s1 | s2 | s3;
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if(s < 0){
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//s = Integer.MAX_VALUE -s ;
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s = Integer.MAX_VALUE * 2 + 1 + s + 1 ;
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}
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return s;
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} else {
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throw new Exception("byte2Int时数组越界");
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}
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}
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/**
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* 小端模式《数据低位在数组低字节》
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* 与方法bytes2Int算法一样，只是把顺序反过来
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* @param bs 字节数组
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* @param from 字节数组起始位置
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* @return
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*/
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public static long bytes2Int_LE(byte[] bs, int from) throws Exception {
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boolean b = isOutOfArrLength(bs.length, (from - 1) + 4);
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if (!b) {
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long s = 0;
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long s0 = bs[from + 0] & 0xFF ;// 数据的最低位在低字节
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long s1 = bs[from + 1] & 0xFF ;
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long s2 = bs[from + 2] & 0xFF ;
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long s3 = bs[from + 3] & 0xFF ;
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// S0不变
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s1 <<= 8;
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s2 <<= 16;
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s3 <<= 24;
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s = s0 | s1 | s2 | s3;
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if(s < 0){
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//s = Integer.MAX_VALUE -s ;
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s = Integer.MAX_VALUE * 2 + 1 + s + 1 ;
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}
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return s;
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} else {
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throw new Exception("byte2Int时数组越界");
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}
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}
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/**
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* 大端模式《数据低位在数组高字节》
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* 无符号short类型转换成2位byte数组
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* java没有无符号短整型数据，只有有符号短整数，取值范围是-32768~32767
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* 若模拟无符号短整型数据，取值范围是0到65535 ，已经超出了java的有符号整数上限，所以只能用java的Int型表示无符号整数
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* @value bs byte[]
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* @value value int int类型的参数
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* @value from int
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*/
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public static void short2Bytes_BE(byte[] bs, int value, int from)throws Exception {
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int maxShortUnsigned = Integer.valueOf(Short.MAX_VALUE) * 2 + 1;
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int minShortUnsigned = Integer.valueOf(Short.MIN_VALUE) * 2 ;
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if(value < minShortUnsigned || value > maxShortUnsigned ){
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throw new Exception("数据" + value + "超出了无符号short型的取值范围(" + minShortUnsigned + "~" + maxShortUnsigned + ")") ;
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}
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short temp = 0 ;
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if(value > Short.MAX_VALUE){
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temp = (Integer.valueOf(value - (Short.MAX_VALUE * 2 + 1) - 1)).shortValue() ;//(Integer.valueOf(Short.MAX_VALUE - value)).shortValue() ;
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}else{
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temp = Integer.valueOf(value).shortValue() ;
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}
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boolean b = isOutOfArrLength(bs.length, (from - 1) + 2);
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if (!b) {
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for (int i = 1; i >= 0; i--) {
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bs[from + i] = Integer.valueOf(temp & 0xff).byteValue();//将最低位保存在高字节
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temp = (short)(temp >> 8); // 向右移8位
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}
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} else {
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throw new Exception("short2Bytes时数组越界");
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}
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}
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/**
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* 小端模式《数据低位在数组低字节》
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* 与方法short2Bytes算法一样，只是把顺序反过来
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* @value bs byte[]
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* @value value int int类型的参数
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* @value from int
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*/
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public static void short2Bytes_LE(byte[] bs, int value, int from)throws Exception {
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int len = 2 ;
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int maxShortUnsigned = Integer.valueOf(Short.MAX_VALUE) * 2 + 1;
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int minShortUnsigned = Integer.valueOf(Short.MIN_VALUE) * 2 ;
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if(value < minShortUnsigned || value > maxShortUnsigned ){
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throw new Exception("数据" + value + "超出了无符号short型的取值范围(" + minShortUnsigned + "~" + maxShortUnsigned + ")") ;
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}
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short temp = 0 ;
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if(value > Short.MAX_VALUE){
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temp = (Integer.valueOf(value - (Short.MAX_VALUE * 2 + 1) - 1)).shortValue() ;//(Integer.valueOf(Short.MAX_VALUE - value)).shortValue() ;
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}else{
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temp = Integer.valueOf(value).shortValue() ;
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}
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boolean b = isOutOfArrLength(bs.length, (from - 1) + len);
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if (!b) {
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for (int i = 0; i < len; i++) {
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bs[from + i] = Integer.valueOf(temp & 0xff).byteValue();//将数据低位保存在数据低字节
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temp = (short)(temp >> 8); // 向右移8位
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}
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} else {
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throw new Exception("short2Bytes时数组越界");
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}
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}
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/**
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* 大端模式《数据低位在数组高字节》
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* 2位字节数组转换为短整型
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* @param bs 字节数组
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* @param from 字节数组起始位置
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* @return 结果
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*/
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public static int bytes2Short_BE(byte[] bs, int from) throws Exception {
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boolean b = isOutOfArrLength(bs.length, (from - 1) + 2);
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if (!b) {
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int s = 0;
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int s0 = Integer.valueOf(bs[from + 0] & 0xff).shortValue();// 最低位
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int s1 = Integer.valueOf(bs[from + 1] & 0xff).shortValue();
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// 最低位S1不变
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s0 <<= 8;
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s = s0 | s1 ;
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if(s < 0){
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s = (Short.MAX_VALUE * 2 + 1) + s + 1;
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}
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return s;
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} else {
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throw new Exception("bytes2Short时数组越界");
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}
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}
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/**
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* 小端模式《数据低位在数组低字节》
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* 与方法bytes2Short算法一样，只是把顺序反过来
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* @param bs 字节数组
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* @param from 字节数组起始位置
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* @return 结果
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*/
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public static int bytes2Short_LE(byte[] bs, int from) throws Exception {
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boolean b = isOutOfArrLength(bs.length, (from - 1) + 2);
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if (!b) {
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int s = 0;
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int s0 = Integer.valueOf(bs[from + 0] & 0xff).shortValue();// 小下标字节转数据低位
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int s1 = Integer.valueOf(bs[from + 1] & 0xff).shortValue();// 大下标字节转数据高位
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// 最低位S0不变
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s1 <<= 8;
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s = s1 | s0 ;
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if(s < 0){
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s = (Short.MAX_VALUE * 2 + 1) + s + 1;
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}
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return s;
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} else {
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throw new Exception("bytes2Short时数组越界");
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}
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}
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/**
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* 1位字节数组转换为短整型
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* @param bs 字节数组
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* @param index 字节数组起始位置
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* @return 结果
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*/
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public static short byte2Byte(byte[] bs, int index) throws Exception {
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if (bs.length - 1 < index) {
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throw new Exception("byte2Short(byte[] bs, int index)时数组越界");
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} else {
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byte bv = (byte)(bs[index] & 0xff) ;
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short s = 0 ;
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if(bv < 0){
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s = (short)(Byte.MAX_VALUE * 2 + 1 + bv + 1) ;
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}else{
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s = bv ;
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}
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return s ;
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}
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}
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/**
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* 无符号short类型转换成1位byte
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* java没有无符号短整型数据，只有有符号短整数，取值范围是-128~127
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* 若模拟无符号短整型数据，取值范围是0到255 ，已经超出了java的有符号整数上限，所以只能用java的short型表示无符号整数
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* @value bs byte[] 字节数组
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* @value value short short类型的参数
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* @value index 起始位置
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*/
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public static void byte2Byte(byte[] bs, short value, int index)throws Exception {
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int maxShortUnsigned = Integer.valueOf(Byte.MAX_VALUE) * 2 + 1;
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int minShortUnsigned = Integer.valueOf(Byte.MIN_VALUE) * 2 ;
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if(value < minShortUnsigned || value > maxShortUnsigned ){
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throw new Exception("数据" + value + "超出了无符号byte型的取值范围(" + minShortUnsigned + "~" + maxShortUnsigned + ")") ;
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}
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if (bs.length - 1 < index) {
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throw new Exception("byte2Byte(byte[] bs, short value, int index)时数组越界");
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} else {
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bs[index] = Integer.valueOf(value & 0xff).byteValue() ;
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}
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}
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/**
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* 判断所有字节是否为0xFF
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* @param bs 字节数组
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* @param index 起始位置
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* @param len 长度
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* @return 结果
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* @throws Exception
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*/
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public static boolean bytesIsAll0xFF(byte[] bs, int index, int len)throws Exception {
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int count = 0 ;
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for(int i = index; i < index + len; i++){
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if(bs[i] == (byte)0xFF){
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count++ ;
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}
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}
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return count==len?true:false ;
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}
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/**
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* 判断数组下标是否越界
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*
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* @value bsLength 数组总长度
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* @value toSite 数组偏移量
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* @return 结果
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*/
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private static boolean isOutOfArrLength(int bsLength, int toSite) {
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if (bsLength > toSite) {
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return false;
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} else {
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return true;
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}
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}
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/*
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public static void main(String[] args) throws Exception{
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// int d = 123456;
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// byte[] bs = new byte[4] ;
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// int2Bytes_BE(bs, d, 0) ;
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// System.out.println(ByteUtil.bytes2Hex(bs, false));
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// long dd = bytes2Int_BE(bs, 0) ;
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// System.out.println(dd);
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//
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// byte[] bb = new byte[1] ;
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// bb[0] = (byte)255 ;
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// short s = byte2Byte(bb, 0);
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// System.out.println(s);
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byte[] bs = new byte[]{(byte)0x00, (byte)0x00, (byte)0x3A, (byte)0x88} ;
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//byte[] bs = new byte[]{(byte)0xff, (byte)0xff, (byte)0xff, (byte)0xff} ;
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boolean flag = ByteUtilUnsigned.bytesIsAll0xFF(bs, 0, 4) ;
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System.out.println(flag);
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Long s = ByteUtilUnsigned.bytes2Int_BE(bs, 0);
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System.out.println(s);
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}
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*/
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}
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