import java.io.*;
import java.util.ArrayList;


public class HelloWorldOS {
 /**
 * 这段二进制数据将是我们 HelloWorld OS 的内核
 * 它的作用是让 BIOS将其加载到地址 0x8000
 * 然后调用 BIOS中断在屏幕上打印出一行字符串
 */

 private int[] imgContent = new int[]{
 0xeb,0x4e,0x90,0x48,0x45,0x4c,0x4c,0x4f,0x49,0x50,0x4c,0x00,0x02,0x01,0x01,0x00,0x02,0xe0,
 0x00,0x40,0x0b,0xf0,0x09,0x00,0x12,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x40,0x0b,0x00,0x00,0x00,0x00,0x29,
 0xff,0xff,0xff,0xff,0x48,0x45,0x4c,0x4c,0x4f,0x2d,0x4f,0x53,0x20,0x20,0x20,0x46,0x41,0x54,0x31,0x32,
 0x20,0x20,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xb8,0x00,0x00,0x8e,
 0xd0,0xbc,0x00,0x7c,0x8e,0xd8,0x8e,0xc0,0xbe,0x74,0x7c,0x8a,
 0x04,0x83,0xc6,0x01,0x3c,0x00,0x74,0x09,0xb4,0x0e,0xbb,0x0f,0x00,0xcd,0x10,0xeb,0xee,0xf4,0xeb,0xfd
 };

 private ArrayList<Integer> imgByteToWrite = new ArrayList<Integer>();


 private void readKernelFromFile(String filename) throws IOException {
 File file = new File(filename);
 InputStream in = new FileInputStream(file);
 int tempbyte = 0;
 while ((tempbyte = in.read()) != -1) {
 imgByteToWrite.add(tempbyte);
 }


 /*
 要想让机器将软盘的头512字节当做操作系统的内核加载到内存
 前512字节的最后两个字节必须是55,aa(Intel公司规定)
 否则无法加载内核
 */
 imgByteToWrite.add(0x55);
 imgByteToWrite.add(0xaa);
 imgByteToWrite.add(0xf0);
 imgByteToWrite.add(0xff);
 imgByteToWrite.add(0xff);
 }

 private HelloWorldOS(String s) throws IOException {
 //for (int i : imgContent) {
 // imgByteToWrite.add(i);
 //}
 ////0a 换行符
 //imgByteToWrite.add(0x0a);
 //imgByteToWrite.add(0x0a);
 //for (int j = 0; j < s.length(); j++) {
 // imgByteToWrite.add((int)s.charAt(j));
 //}
 //imgByteToWrite.add(0x0a);
 //
 //int len = 0x1fe; //510B
 //int curSize = imgByteToWrite.size();
 //for (int k = 0; k < len - curSize; k++) {
 // imgByteToWrite.add(0);
 //}
 //
 ///*
 // * 要想让机器将软盘的头512字节当做操作系统的内核加载到内存
 // * 头512字节的最后两个字节必须是55,aa(Intel公司规定)
 // * 否则无法加载内核
 // */
 //imgByteToWrite.add(0x55);
 //imgByteToWrite.add(0xaa);
 //imgByteToWrite.add(0xf0);
 //imgByteToWrite.add(0xff);
 //imgByteToWrite.add(0xff);
 readKernelFromFile("F:\\Code\\Java\\Java4LinuxOS\\boot");
 int len = 0x168000; //1474560B
 int curSize = imgByteToWrite.size();
 for (int l = 0; l < len - curSize; l++) {
 imgByteToWrite.add(0);
 }

 }

 /**
 * 在磁盘上创建一个 1474560字节的二进制文件
 * 将 imgContent的内容写入该文件的头512字节
 * 这个二进制文件将作为一个 1.5M的虚拟软盘用于当做
 * 虚拟机的启动软盘
 */
 private void makeFllopy() {
 try {
 DataOutputStream out = new DataOutputStream(new FileOutputStream("system.img"));
 for (int i = 0; i < imgByteToWrite.size(); i++) {
 out.writeByte(imgByteToWrite.get(i).byteValue());
 }
 System.out.println("映像文件制作完成...");
 } catch (Exception e) {
 e.printStackTrace();
 }

 }

 public static void main(String[] args) throws IOException {
 	HelloWorldOS op = new HelloWorldOS("hello, this is my first line of my operating system code");
 op.makeFllopy();
 }
}