package IO;

import org.junit.Test;

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

public class PictureTest {
    //对图片进行加密
    @Test
    public void test1() {
        FileInputStream fi = null;
        FileOutputStream fo = null;
        try {
            fi = new FileInputStream(new File("香港图书馆.jpeg"));
            fo = new FileOutputStream(new File("香港图书馆secret.jpeg"));

            byte[] buffer = new byte[1024];
            int len;
            while ((len = fi.read(buffer)) != -1) {
                for (int i = 0; i < len; i++) {
                    buffer[i] = (byte) (buffer[i] ^ 5);
                }


                fo.write(buffer, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fi != null) {
                try {
                    fi.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fo != null) {
                try {
                    fo.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }

    }


    //对图片进行解密
    @Test
    public void test2() {
        FileInputStream fi = null;
        FileOutputStream fo = null;
        try {
            fi = new FileInputStream(new File("香港图书馆secret.jpeg"));
            fo = new FileOutputStream(new File("香港图书馆Nosecret.jpeg"));

            byte[] buffer = new byte[1024];
            int len;
            while ((len = fi.read(buffer)) != -1) {
                for (int i = 0; i < len; i++) {
                    buffer[i] = (byte) (buffer[i] ^ 5);
                }


                fo.write(buffer, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fi != null) {
                try {
                    fi.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fo != null) {
                try {
                    fo.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }

    }
}