/*
需求
自定义字节流缓冲区

*/
import java.io.*;
class MyBufferedInputStream
{
    private InputStream in;
    private byte[] buf = new byte[1024*4];
    private int pos = 0,count = 0;
    
    MyBufferedInputStream(InputStream in)
    {
        this.in = in;
    }
    
    //一次读一个字符，从缓冲区(字节数组)获取
    public int myRead()throws IOException
    {
        //返回为int类型是为了提升返回值的类型
        //通过in对象读取硬盘上数据，并储存buf中
        if (count==0)
        {
            count = in.read(buf);
            if(count<0)
                return -1;
            pos = 0;
            byte b = buf[pos];

            count--;
            pos++;
            
            return b&255;
        }
        else
        {
            byte b = buf[pos];

            count--;
            pos++;
            
            return b&0xff;            
        }        
    }
    public void myClose()throws IOException
    {
        in.close();
    }            
}
class MyBufferedInputStreamDemo
{
    public static void main(String[] args)throws IOException
    {
        myCopyMusic();
    }
    public static void myCopyMusic()throws IOException
    {
        MyBufferedInputStream mbis = new MyBufferedInputStream(new FileInputStream("F:\\2.mp3"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("F:\\1.mp3"));
        int ch = 0;
        
        while((ch=mbis.myRead())!=-1)
        {
            bos.write(ch);
        }
        bos.close();
        mbis.myClose();
    }
}