/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package html_test;

import java.io.File;

/**
 *
 * @author H3R3T1C
 */
public class Packet {


    public Packet()
    {

    }

    public String creatHeader(int type,long size,String file_name,String f_type, String user)// type of data | Size of data | If its a file data sends
    {                                                                                     // file name else its a null byte | if file sends file type
                                                                                          // based on int value (may change to string)
        String tmp="";                                                                    // user is string for now but will possibly change
        String padding="00";// used as a "null" byte                                           // user is gotten from list of users in room
        if(!file_name.isEmpty())
        tmp=numToHex(type)+padding+
            numToHex(size)+padding+
            StringtoHex(file_name)+
            StringtoHex(f_type)+
            StringtoHex(user);

        else
        tmp=numToHex(type)+padding+
            numToHex(size)+padding+
            StringtoHex(file_name)+
            StringtoHex(f_type)+
            StringtoHex(user);
        return tmp;
    }
    public byte[] createFilePacket(File file)// converts files into byte code for sending over internet
    {
        byte[] data={0};// whole thing = 0 (null) byte

        return data;

    }
    public byte[] createStringPacket(String string)// a diff method needs to be applyed
    {
        byte nul=0;
        byte[] tmp;
        
        return string.getBytes();
    }
    public String StringtoHex(String data)
    {
        char[] chars = data.toCharArray();
        StringBuffer output = new StringBuffer();
        byte padding=0;
        for(int i = 0; i < chars.length; i++){
        output.append(Integer.toHexString((int)chars[i]));
        }
        output.append(Integer.toHexString((int)padding));
        output.append(Integer.toHexString((int)padding));
        return output.toString();
    }
    public String hexToString(String data)
    {
        char[] chars = data.toCharArray();
        int z=0;
        String output="";
        byte a=00;
        String tmp="";
        for(int i = 0; i < chars.length; i+=2){
            tmp=""+chars[i]+chars[i+1];
            z=Integer.parseInt(tmp,16);
            output+=(char)z;
        }
        return output;
   }
    public String decodeHeader(String data)
    {
        String output="";
        String tmp="";
        int loc=0;
        char[] chars=data.toCharArray();
        for(int a=0;a<2;a++)
        {
            for(int i=loc;i<data.length();i+=2)// decodes type and size
            {
                if((char)chars[i]=='0'&&(char)chars[i+1]=='0')
                {
                    loc=i+2;
                    break;
                }
                else
                {
                    tmp+=""+(char)chars[i]+(char)chars[i+1];
                }
            }
            output+=hexToNum(tmp)+" ";
            tmp="";
        }
        for(int a=0;a<4;a++)
        {
            for(int i=loc;i<data.length();i+=2)
            {
                if(chars[i]=='0'&&chars[i+1]=='0')
                {
                    loc=i+2;
                    break;
                }
                else
                {
                    tmp+=""+chars[i]+chars[i+1];
                }
            }
            output+=hexToString(tmp)+" ";
            tmp="";
        }
        return output;
    }
    public String numToHex(int a)
    {
        String tmp="";
        tmp=Integer.toHexString(a);
        if(tmp.length()%2!=0)
        {
            tmp="0"+tmp;
        }
        return tmp;
    }
    public String numToHex(long a)
    {
        String tmp="";
        tmp=Integer.toHexString((int)a);
        if(tmp.length()%2!=0)
        {
            tmp="0"+tmp;
        }
        return tmp;
    }
    public String hexToNum(String data)
    {
        return ""+Integer.parseInt(data, 16);
    }
}