package com.safeluck.aykj.utils;
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public final class BytesUtils {
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public static String bytesToHexString(byte[] src,int len){
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return bytesToHexString(src,0,len);
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}
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public static String bytesToHexString(byte[] src){
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return bytesToHexString(src,0,src.length);
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}
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public static String bytesToHexString(byte[] src,int start,int len){
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StringBuilder stringBuilder = new StringBuilder("");
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if (src == null || src.length <= 0) {
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return null;
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}
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for (int i = start; i < len; i++) {
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int v = src[i] & 0xFF;
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String hv = Integer.toHexString(v);
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if (hv.length() < 2) {
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stringBuilder.append(0);
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}
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stringBuilder.append(hv);
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}
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return stringBuilder.toString().toUpperCase();
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}
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public static byte[] hexStringToBytes(String hexString) {
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if (hexString == null || hexString.equals("")) {
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return null;
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}
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hexString = hexString.toUpperCase();
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int length = hexString.length() / 2;
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char[] hexChars = hexString.toCharArray();
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byte[] d = new byte[length];
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for (int i = 0; i < length; i++) {
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int pos = i * 2;
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d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
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}
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return d;
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}
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private static byte charToByte(char c) {
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return (byte) "0123456789ABCDEF".indexOf(c);
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}
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public static byte xor(byte[] bytes,int start,int end)
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{
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if (bytes.length < end)
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{
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throw new RuntimeException("计算xor的时候size不足");
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}
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int s1 = bytes[start];
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for (int i = start + 1; i < end; i++)
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{
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s1 = s1 ^ bytes[i];
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}
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return (byte)s1;
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}
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public static byte xor(byte[] bytes)
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{
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return xor(bytes,0,bytes.length);
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}
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public static String toHexString(byte b)
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{
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String hex = Integer.toHexString(b&0xff).toUpperCase();
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if(hex.length()==1)
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{
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return "0"+hex;
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}
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return hex;
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}
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public static int sum(byte[] bytes,int start,int end)
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{
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if (bytes.length < end)
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{
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throw new RuntimeException("计算sum的时候size不足");
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}
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int s1 = 0;
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for (int i = start; i < end; i++)
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{
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// System.out.println(bytes[i]&0xFF);
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s1 += (bytes[i]&0xFF);
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// System.out.println("sum="+s1);
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}
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return s1;
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// int sum = 0;
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// for(byte b:bytes)
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// {
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// sum+=b;
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// }
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// return sum;
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}
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public static int sum(byte[] bytes)
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{
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return sum(bytes,0,bytes.length);
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}
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public static int getInt32(byte[] bytes,int start){
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int result = 0;
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int a = (bytes[0+start] & 0xff) << 24;
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int b = (bytes[1+start] & 0xff) << 16;
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int c = (bytes[2+start] & 0xff) << 8;
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int d = (bytes[3+start] & 0xff);
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result = a | b | c | d;
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return result;
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}
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}
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