package top.qaqaq.java.P598;

import org.junit.jupiter.api.Test;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author RichieZhang
 * @create 2022-10-30 下午 12:24
 */
public class PicTest {

    //图片的加密
    @Test
    public void test1() {

        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream("爱情与友情.jpg");
            fos = new FileOutputStream("爱情与友情secret.jpg");

            byte[] buffer = new byte[20];
            int len;
            while ((len = fis.read(buffer)) != -1){
                //字节数组进行修改
                //错误的
    //            for (byte b : buffer){
    //                b = (byte) (b ^ 5);
    //            }
                //正确的
                for (int i = 0; i < len; i ++){
                    buffer[i] = (byte) (buffer[i] ^ 5);
                }
                fos.write(buffer,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fos != null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (fis != null){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    //图片的解密
    @Test
    public void test2() {

        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream("爱情与友情secret.jpg");
            fos = new FileOutputStream("爱情与友情4.jpg");

            byte[] buffer = new byte[20];
            int len;
            while ((len = fis.read(buffer)) != -1){
                //字节数组进行修改
                //错误的
                //            for (byte b : buffer){
                //                b = (byte) (b ^ 5);
                //            }
                //正确的
                for (int i = 0; i < len; i ++){
                    buffer[i] = (byte) (buffer[i] ^ 5);
                }
                fos.write(buffer,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fos != null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (fis != null){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}