import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.IOException;

public class Split{

public static void main(String[] args){

if(args.length!=2){

System.err.println("usage: java Split pathname partsize");

return;

}

File srcFile = new File(args[0]);

if(!srcFile.exists()){

System.err.println("File does not exist.");

return;

}

if(srcFile.isDirectory()){

System.err.println("The specified file is a directory.");

return;

}

long srcSize = srcFile.length(); // unit byte.

long partSize = 0;

BufferedInputStream bis = null;

BufferedOutputStream bos = null;

try{

partSize = (long)(Float.parseFloat(args[1]) * 1024 * 1024); // unit megabyte.

int quotient = (int)(srcSize/partSize);

int partCount = srcSize % partSize==0 ? quotient : quotient+1;

int partOffset = 0;

File partFile = new File(srcFile.getName() + "_part_" + partOffset);

int read;

int partFileSize = 0;

bis = new BufferedInputStream(new FileInputStream(srcFile));

bos = new BufferedOutputStream(new FileOutputStream(partFile));

while((read=bis.read())!=-1){

if(partFileSize == partSize){

partOffset++;

partFile = new File(srcFile.getName() + "_part_" + partOffset);

partFileSize = 0;

bos.flush();

bos.close();

bos = new BufferedOutputStream(new FileOutputStream(partFile));

}

bos.write(read);

partFileSize ++;

}

}catch(NumberFormatException nfe){

nfe.printStackTrace();

}catch(IOException ioe){

ioe.printStackTrace();

}finally{

if(bis!=null){

try{

bis.close();

}catch(IOException ioe){

ioe.printStackTrace();

}

}

if(bos!=null){

try{

bos.close();

}catch(IOException ioe){

ioe.printStackTrace();

}

}

}

}

}