package com.github.mrwengq.tid.impl;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Arrays;
import com.github.mrwengq.tid.api.Connection;
public class ConnectionImpl implements Connection{
private URL url;
public ConnectionImpl(String url ){
try {
this.url = new URL(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
@Override
public byte[] read(int startPos, int endPos) throws IOException {
URLConnection con = url.openConnection();
con.setRequestProperty("RANGE","bytes="+startPos+"-"+endPos);
BufferedInputStream bf = new BufferedInputStream(con.getInputStream());
byte[] b = new byte[1024];
int tolen = endPos - startPos +1;
ByteArrayOutputStream bo = new ByteArrayOutputStream();
while(bo.size()<tolen){
int len = bf.read(b);
if(len<0){
break;
}
bo.write(b,0,len);
}
if(bo.size()>tolen){
byte[] data = bo.toByteArray();
return Arrays.copyOf(data, tolen);
}
return bo.toByteArray();
}
@Override
public int getContentLength() {
int a = 0;
try {
URLConnection con = url.openConnection();
a = con.getContentLength();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return a;
}
@Override
public void close() {
}
}