package com.anyun.im_lib.util;
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import android.text.TextUtils;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetDecoder;
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/**
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* MyApplication2
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* Created by lzw on 2019/12/13. 12:01:18
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* 邮箱：632393724@qq.com
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* All Rights Saved! Chongqing AnYun Tech co. LTD
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*/
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public class ByteUtil {
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/**
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* @功能: BCD码转为10进制串(阿拉伯数据)
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* @参数: BCD码
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* @结果: 10进制串
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*/
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public static String bcd2Str(byte[] bytes) {
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StringBuffer temp = new StringBuffer(bytes.length * 2);
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for (int i = 0; i < bytes.length; i++) {
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temp.append((byte) ((bytes[i] & 0xf0) >>> 4));
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temp.append((byte) (bytes[i] & 0x0f));
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}
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return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp
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.toString().substring(1) : temp.toString();
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}
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/**
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* @功能: 10进制串转为BCD码
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* @参数: 10进制串
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* @结果: BCD码
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*/
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public static byte[] str2Bcd(String asc) {
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int len = asc.length();
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int mod = len % 2;
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if (mod != 0) {
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asc = "0" + asc;
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len = asc.length();
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}
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byte abt[] = new byte[len];
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if (len >= 2) {
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len = len / 2;
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}
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byte bbt[] = new byte[len];
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abt = asc.getBytes();
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int j, k;
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for (int p = 0; p < asc.length() / 2; p++) {
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if ((abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {
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j = abt[2 * p] - '0';
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} else if ((abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {
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j = abt[2 * p] - 'a' + 0x0a;
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} else {
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j = abt[2 * p] - 'A' + 0x0a;
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}
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if ((abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {
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k = abt[2 * p + 1] - '0';
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} else if ((abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {
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k = abt[2 * p + 1] - 'a' + 0x0a;
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} else {
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k = abt[2 * p + 1] - 'A' + 0x0a;
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}
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int a = (j << 4) + k;
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byte b = (byte) a;
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bbt[p] = b;
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}
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return bbt;
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}
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public static String getString(byte[] bytes, String charsetName) {
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return new String(bytes, Charset.forName(charsetName));
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}
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public static String getString(byte[] bytes) {
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return getString(bytes, "GBK");
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}
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/**
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* bytes转换成十六进制字符串
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* @param byte[] b byte数组
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* @return String 每个Byte值之间空格分隔
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*/
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public static String byte2HexStr(byte[] b)
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{
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String stmp="";
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StringBuilder sb = new StringBuilder("");
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for (int n=0;n<b.length;n++)
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{
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stmp = Integer.toHexString(b[n] & 0xFF);
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sb.append((stmp.length()==1)? "0"+stmp : stmp);
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sb.append(" ");
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}
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return sb.toString().toUpperCase().trim();
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}
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/**
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* bytes字符串转换为Byte值
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* @param String src Byte字符串，每个Byte之间没有分隔符
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* @return byte[]
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*/
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public static byte[] hexStr2Bytes(String src)
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{
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int m=0,n=0;
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int l=src.length()/2;
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System.out.println(l);
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byte[] ret = new byte[l];
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for (int i = 0; i < l; i++)
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{
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m=i*2+1;
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n=m+1;
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ret[i] = Byte.decode("0x" + src.substring(i*2, m) + src.substring(m,n));
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}
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return ret;
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}
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/**
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* 16进制的字符串表示转成字节数组
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*
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* @param hexString 16进制格式的字符串
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* @return 转换后的字节数组
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**/
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public static byte[] toByteArray(String hexString) {
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if (TextUtils.isEmpty(hexString))
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throw new IllegalArgumentException("this hexString must not be empty");
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hexString = hexString.toLowerCase();
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final byte[] byteArray = new byte[hexString.length() / 2];
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int k = 0;
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for (int i = 0; i < byteArray.length; i++) {//因为是16进制，最多只会占用4位，转换成字节需要两个16进制的字符，高位在先
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byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff);
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byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff);
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byteArray[i] = (byte) (high << 4 | low);
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k += 2;
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}
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return byteArray;
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}
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public static int getInt(byte i) {
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int low = i&0x0f;
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int hight= (i>>4)&0x0f;
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return low+hight*16;
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}
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public static int getBCDInt(byte i) {
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int low = i&0x0f;
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int hight= (i>>4)&0x0f;
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return low+hight*10;
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}
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/**
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* ByteBuffer 转换 String
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* @param buffer
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* @return
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*/
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public static String getString(ByteBuffer buffer)
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{
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Charset charset = null;
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CharsetDecoder decoder = null;
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CharBuffer charBuffer = null;
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try
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{
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charset = Charset.forName("UTF-8");
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decoder = charset.newDecoder();
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charBuffer = decoder.decode(buffer);//用这个的话，只能输出来一次结果，第二次显示为空
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// charBuffer = decoder.decode(buffer.asReadOnlyBuffer());
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return charBuffer.toString();
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}
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catch (Exception ex)
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{
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ex.printStackTrace();
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return "";
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}
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}
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/**
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* short转为字节数组
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* @param data
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* @return 包含2个字节的字节数组
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*/
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public static byte[] shortGetBytes(short data) {
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byte[] bytes = new byte[2];
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bytes[0] = (byte) (data & 0xff);
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bytes[1] = (byte) ((data & 0xff00) >> 8);
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return bytes;
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}
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public static byte[] shortGetByte(short data){
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byte[] bytes = new byte[1];
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bytes[0] = (byte)(data & 0xff);
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return bytes;
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}
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public static void main(String[] args){
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System.out.println(byte2HexStr(shortGetBytes((short) 65535)));
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short b = (short) 32768;
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b++;
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System.out.println(byte2HexStr(shortGetBytes((short) b)));
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}
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}
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