package safeluck.drive.evaluation.util;
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import android.content.res.Resources;
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import android.util.Log;
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import android.util.TypedValue;
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import com.anyun.exam.lib.MyLog;
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import com.anyun.exam.lib.util.ByteUtil;
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/**
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* MyApplication2
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* Created by lzw on 2019/3/18. 13:13:42
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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 Utils {
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private static final String TAG = "Utils";
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public static float px2dp(float value){
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return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,value, Resources.getSystem().getDisplayMetrics());
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}
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/**
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* dp值转像素
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* @param dpValue
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* @return
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*/
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public static float dp2Px(int dpValue){
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return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX,dpValue,Resources.getSystem().getDisplayMetrics());
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}
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/**
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* 平台协议生成的校验码
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* @param bytes
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* @return
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*/
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public static byte calCheckCode(byte[] bytes){
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byte checkCode =0;
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// 参与运算的两个值，如果两个相应bit位相同，则结果为0，否则为1。
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for (int i = 0; i < bytes.length; i++) {
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checkCode ^= bytes[i];
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}
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return checkCode;
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}
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/**
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* 转义
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* 采用Ox7e表示，若校验码、消息头以及消息体中出现0x7e，则要进行转义处理，转义规则定义如下:
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* 0x7e<——>0x7d后紧跟一个0x02；
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* 0x7d<——>0x7d后紧跟一个0x01。
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* @param datas
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* @return
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*/
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public static byte[] transferMeaning(byte[] datas){
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byte [] temp = new byte[datas.length*2];
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int y = 0;
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temp[y++] = 0x7e;
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for (int i = 1; i < datas.length-1; i++) {
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if (datas[i] == 0x7E) {
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temp[y++] = 0x7D;
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temp[y++] = 0x02;
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} else if (datas[i] == 0x7D) {
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temp[y++] = 0x7D;
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temp[y++] = 0x01;
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} else {
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temp[y++] = datas[i];
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}
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}
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temp[y++] = 0x7e;
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byte[] tranferbytes = new byte[y];
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System.arraycopy(temp,0,tranferbytes,0,y);
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Log.i(TAG,"转义过后："+ ByteUtil.byte2hex(tranferbytes));
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return tranferbytes;
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}
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/**
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*接收消息时:转义还原
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* @param datas
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* @return
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*/
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public static byte[] parseMsg(byte[] datas){
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byte[] temp = new byte[datas.length];
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int y =0 ;
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for (int i = 0; i < datas.length; i++) {
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if (datas[i]==0x7d && datas[i+1]==0x02 ){
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temp[y++] = 0x7e;
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i++;
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continue;
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}else if (datas[i]==0x7d && datas[i+1]==0x01 ){
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temp[y++] = 0x7d;
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i++;
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continue;
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}else{
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temp[y++] = datas[i];
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}
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}
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return temp;
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}
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public static boolean isDigital(String str) {
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String regx= "^\\d+";
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return str.matches(regx);
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}
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}
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