////////////////////////////////////////////////////////////////////////////////////////////
//PIMS: Personal Invstment Management System
//Class : FileDownload
//Author: Raghu
//This class downloads file from net using proxy 
//
////////////////////////////////////////////////////////////////////////////////////////////


import java.io.*;
import java.net.*;
import java.util.*;

public class FileDownload {

FileDownload(){
}


public static 
int readBlocking( InputStream inStream, byte b[], int iOffset,int len ) 
	throws IOException {

		int totalBytesRead = 0;
		int bytesRead = 0;
			while ( totalBytesRead < len
				&& (bytesRead = inStream.read( b, iOffset + totalBytesRead,
				len - totalBytesRead )) >= 0 ) {
			totalBytesRead += bytesRead;
			}
return totalBytesRead;
}


public boolean download( URL url, File fileOut ) {
	URLConnection uc = null;
	InputStream inStream = null;

	FileOutputStream fos = null;

	if( url == null || fileOut == null ) {

	return false;
	}

	try {
		uc = url.openConnection();
		uc.setAllowUserInteraction( true );
		uc.setDoInput( true );
		uc.setDoOutput( false );
		uc.setUseCaches( true );
		uc.connect();
		inStream = uc.getInputStream();
		fos = new FileOutputStream( fileOut );
		return copy( inStream, fos, uc.getContentLength(), true );
	} catch (IOException ioe) {
		return false;
	} catch(Exception e) {

	return false;
	}
}


public boolean 
copy ( InputStream inStream, OutputStream outStream, long length,boolean isClosed ) {

	if ( length <= 0 || inStream == null || outStream == null ) {
		return false;
	}

	try {
		int blockSize = (int)Math.min( 512, length );
		long blocks = length / blockSize;
		int lastBlock = (int) ( length % blockSize );
		byte[] byteArray = new byte[ blockSize ];
		for ( long i = 0; i < blocks; i++ ) {
		int bytesRead = readBlocking( inStream, byteArray, 0, blockSize);
		if ( bytesRead != blockSize ) throw new IOException();
		outStream.write(byteArray);
	}

	if ( lastBlock > 0 ) {
		int bytesRead = readBlocking( inStream, byteArray, 0 , lastBlock );
		if ( bytesRead != lastBlock ) throw new IOException();
			outStream.write( byteArray, 0 , lastBlock );
	}

	inStream.close();

		if ( isClosed ) {
			outStream.close();
		}
	return true;
	} catch ( IOException ioe ) {
		return false;
	} catch ( Exception e ) {
		return false;
	}
	}
}