MachineFactory

package pad.ijvm;

import pad.ijvm.interfaces.IJVMInterface;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class MachineFactory {

    public static IJVMInterface createIJVMInstance(File binary) throws IOException {
        // Create new machine instance here and return it.
    	try{
    	//File file = new File("/path/to/file.txt");

    	byte[] bytes = new byte[(int) binary.length()];
    	FileInputStream fileInputStream = new FileInputStream(binary);
    	fileInputStream.read(bytes);
    	fileInputStream.close();
    	ReadDoc processBinary = new ReadDoc(bytes);
    	} catch (FileNotFoundException e){
    		System.err.printf("%s\n",  e.getMessage());
    	} catch (IOException e) {
    		e.printStackTrace();
    	}

        return null;
    }

}




----------------------------------------------------ReadDoc-----------------------------
package pad.ijvm;
import java.lang.System;

public class ReadDoc {

	static final int BYTE_CONSTANT=4;
	int sizeOfText;

	byte[] binary;
	byte[] constantAndText;
	int constantSize;
	byte[] text;


	ReadDoc(byte[] bytes){
		binary = new byte[(int) bytes.length];
		System.arraycopy(bytes, 0, binary, 0, bytes.length);

	}

	void getInfo(){
		constantAndText = new byte[((binary.length)-BYTE_CONSTANT)];
		System.arraycopy(binary, BYTE_CONSTANT, constantAndText, 0, constantAndText.length);
		readBlock();
	}

	void readBlock(){
		constantSize= ((constantAndText[0] & 0xFF) << 24) |
				((constantAndText[1] & 0xFF) << 16) |
				((constantAndText[2] & 0xFF) << 8) |
				(constantAndText[3] & 0xFF);
		constantSize*=4; //every constant has 4 bytes


	}
}