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  source code of huffman coding ?
Thu Dec 04, 2008 5:46 pm 

I really need it. The program is able to not only compress one many text files but also de-compress the compressed files later. I have seen a program can do it but this one implements to compress and decompress together. It's so bad, I just need program can compress many files and decompress those files later.Please give me result soon, I very very need. Thank!


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  Re: can someone give me source code of huffman coding ?
Thu Dec 04, 2008 6:28 pm 
java/huffman-compression-decompression-t96.html

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  Re: source code of huffman coding ?
Fri Dec 05, 2008 10:12 am 
oh I've just seen that code but I need one program compress a file text, this program just write the binary numbers to file comp.txt. It's not a compressed file, file comp.txt is bigger size than original text file


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  Re: source code of huffman coding ?
Fri Dec 05, 2008 12:24 pm 
Original Topic:
java/standard-huffman-coding-t6.html
Try this , it is a netBeans project ,
Attachment:
File comment: netBeans project ,
Huffman_compersion.rar [28.24 KiB]
Downloaded 3511 times


\code snippet :
java code
package huffman_compersion;

import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;



public class Main extends JFrame {

/** Creates a new instance of Main */

public Main() {
setFont(new Font("Aril",Font.BOLD,14));
setBackground(Color.BLACK);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500,200);
setLocation(100,100);
setTitle("Huffman-Compersion");

Container cp=getContentPane();
cp.setLayout(new FlowLayout());
cp.setBackground(Color.BLACK);
JButton myButton=new JButton("Start");
myButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
readLoop();
}
});
cp.add(myButton);
JButton Browse=new JButton("Browse");
Browse.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int rVal =c.showOpenDialog(null);
if(rVal == JFileChooser.APPROVE_OPTION) {
path=c.getSelectedFile().getAbsolutePath();

}
}
});
cp.add(Browse);
setVisible(true);
}
public void start() {
try {

ReadHand=new BufferedReader(new FileReader(path));

} catch (FileNotFoundException ex) {

ex.printStackTrace();

}
}
public void readLoop() {
int code=0;
String ch;
start();
while(true) {
try {
code=ReadHand.read();
if(code==-1)break;
ch=fromCode_toString(code);
if(mydata_str==null) {
mydata_str=ch;
} else
mydata_str+=ch;
add_to_list(ch);

} catch (IOException ex) {
ex.printStackTrace();
}





}
try {
ReadHand.close();
} catch (IOException ex) {
ex.printStackTrace();
}

sort_my_data(mylist);


evaluate_code();
write_To_file();

code_data_content();
System.out.println(mydata_str);
System.out.println(mydata_coded);
write_Compressed();
Decompress();
}
public void code_data_content() {
String mySub;
for(int i=0;i<mydata_str.length();i++) {
mySub=mydata_str.substring(i,i+1);
mySub=getChar_code(mySub);
if( mydata_coded==null) {
mydata_coded=mySub;
} else {
mydata_coded+=mySub;
}

}
}
public void write_Compressed() {
File myFile=new File("comp.txt");
FileOutputStream fout;


try {
WriteHand=new BufferedWriter(new FileWriter("comp.txt"));
WriteHand.write(mydata_coded);
WriteHand.flush();
WriteHand.close();
} catch (IOException ex) {
ex.printStackTrace();
}







}
public void Decompress() {
try {
ReadHand1=new BufferedReader(new FileReader("table.txt"));
ReadHand2=new BufferedReader(new FileReader("comp.txt"));
} catch (FileNotFoundException ex) {
ex.printStackTrace();
}


String total = null;
String data_from_file=null;

try {
while(true) {
total=ReadHand1.readLine();


if(total==null)break;

if(total!=null)
list_From_file.add(new data(total.substring(0,1),total.substring(2,total.length())));


}

while(true) {
total=ReadHand2.readLine();


if(total==null)break;

if(data_from_file==null)data_from_file=total;
else
data_from_file+=total;


}
System.out.println(data_from_file);
int j=0;
int index;
String data_to_file=null;
for(int i=1;i<=data_from_file.length();i++) {
index=isEqualSomething(data_from_file.substring(j,i));
if(index!=-1) {
if(data_to_file==null)
data_to_file=((data)list_From_file.get(index)).getChar();
else
data_to_file+=((data)list_From_file.get(index)).getChar();

j=i;
}
}



WriteHand=new BufferedWriter(new FileWriter("decompress.txt"));
WriteHand.write(data_to_file);
WriteHand.flush();
WriteHand.close();
} catch (IOException ex) {
ex.printStackTrace();
}

display_list_content(list_From_file);
}
public int isEqualSomething(String str) {
for(int i=0;i<list_From_file.size();i++) {
if(((data)list_From_file.get(i)).getBinary_Code().equals(str))
return i;
}
return -1;
}
public String getChar_code(String str) {
myDataList mytable=(myDataList) arrList.get(0);

for(int i=0;i<mytable.size();i++) {
if(((data)mytable.get(i)).getChar().equals(str)) {
return (((data)mytable.get(i)).getBinary_Code());
}
}
return "??";
}
public void display_list_content(myDataList myLink_list) {
data my_Data;
for(int i=0;i<myLink_list.size();i++) {
my_Data=((data)myLink_list.get(i));
System.out.println(my_Data.getChar()+" "+my_Data.get_probability()+" "+my_Data.isFlag()+" "
+my_Data.getBinary_Code());
}

}
public String fromCode_toString(int code) {
return Character.toString((char)code);
}
public void add_to_list(String ch) {


for(int i=0;i<mylist.size();i++) {
if(ch.equals(((data)mylist.get(i)).getChar())) {
((data)mylist.get(i)).increment();
return;
}
}

mylist.add(new data(ch));



}
public void sort_my_data(myDataList myLinklist) {
Collections.sort(myLinklist,my_comparator);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here

new Main();
}
public void evaluate_code() {
myDataList linklist=(myDataList) mylist.clone();
myDataList temp;
int size=linklist.size();
// System.out.println(size);

arrList.add( linklist.clone());
while(size>2) {
// System.out.println( ((data)linklist.get(size-2)).getChar()+"//////////"+ ((data)linklist.get(size-1)).getChar());
((data)linklist.get(size-2)).append_data(((data)linklist.get(size-1)));
linklist.removeLast();

temp= (( myDataList) linklist.clone());
((data)linklist.get(size-2)).setFlag(true);
setToflagOthers(temp);
sort_my_data(linklist);
sort_my_data(temp);


arrList.add( temp);



size--;
}
doCoding_to_tree();

}
public void setToflagOthers(myDataList mylist) {
for(int i=0;i<mylist.size()-1;i++) {
((data)mylist.get(i)).setFlag(false);
}
}
public void doCoding_to_tree() {
myDataList temp1=((myDataList) arrList.get(arrList.size()-1));
myDataList temp2;
data mydata;
((data) temp1.get(0)).setBinary_Code("1");
((data) temp1.get(1)).setBinary_Code("0");
for(int i=arrList.size()-1;i>0;i-- ) {
temp1=((myDataList) arrList.get(i));
temp2=((myDataList) arrList.get(i-1));
copmare_and_code(temp1,temp2);
}
}
public int get_Where_the_true_code(myDataList mylist) {
for(int i=0;i<mylist.size();i++) {
if(((data)mylist.get(i)).isFlag())
return i;
}
return -1;
}
public void copmare_and_code(myDataList temp1,myDataList temp2) {
for(int j=0;j<temp2.size();j++)
for(int i=0;i<temp1.size();i++) {
if ((((data)temp2.get(j)).getChar()).equals(((data)temp1.get(i)).getChar())) {
((data)temp2.get(j)).setBinary_Code(((data)temp1.get(i)).getBinary_Code());

}

}
int postion= get_Where_the_true_code(temp1);
((data)temp2.get(temp2.size()-2)).setBinary_Code(((data)temp1.get(postion)).getBinary_Code()+"1");
((data)temp2.get(temp2.size()-1)).setBinary_Code(((data)temp1.get(postion)).getBinary_Code()+"0");
}


public void write_To_file() {
try {
WriteHand=new BufferedWriter(new FileWriter("table.txt"));

myDataList mytable=(myDataList) arrList.get(0);

for(int i=0;i<mytable.size();i++) {
WriteHand.write(((data)mytable.get(i)).getChar());
WriteHand.write(" ");
WriteHand.write(((data)mytable.get(i)).getBinary_Code());
WriteHand.newLine();
}

WriteHand.flush();
WriteHand.close();

} catch (IOException ex) {
ex.printStackTrace();
}


}
short substring_to_int(String str) {
short b = 0;
for(int i=0;i<str.length();i++) {
if(str.charAt(i)=='1') {

b+=(byte)Math.pow(2,i);
}
}
return b;

}


private BufferedReader ReadHand;
private data_Comparator my_comparator=new data_Comparator();
private myDataList mylist=new myDataList();
private myDataList arrList=new myDataList();
private BufferedWriter WriteHand;
private String mydata_str;
private String mydata_coded;
private myDataList list_From_file=new myDataList();

private BufferedReader ReadHand2;
private JFileChooser c = new JFileChooser();
private BufferedReader ReadHand1;
private String path;

public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d=(Graphics2D )g;

g2d.setBackground(Color.BLACK);
g2d.setColor(Color.RED);
g2d.drawString("www.codemiles.com team works",50,100);

}
}
class myDataList extends LinkedList {

public Object clone() {
myDataList cp=new myDataList();
data mydata;

for(int i=0;i<size();i++) {
mydata=(data)get(i);
cp.add(new data(mydata.getChar(),mydata.get_probability(),mydata.isFlag()));
}
return cp;
}
}

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Author:
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  Re: source code of huffman coding ?
Fri Dec 05, 2008 1:10 pm 
Ah,this program just create binary numbers to file text. So it's just compresses from a file text to an another file text . Can you combine write_Compressed() and write_To_file() to one? I mean
the binary string and binary table are in only file text. Besides, I don't know how can change binary numbers to bit. I know BitInputStream and BitOutputStream can do it but I don't know how to use. Please help me.


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  Re: source code of huffman coding ?
Fri Dec 05, 2008 7:40 pm 
what is missing in it :roll:

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Author:
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  Re: source code of huffman coding ?
Sat Dec 06, 2008 10:47 am 
yes, file IHuffProcessor didn't have. Can you finish? And do you know the way can change binary numbers in file comp.txt which one you give me by BitInputStream and BitOutputStream


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  Re: source code of huffman coding ?
Sat Dec 06, 2008 12:13 pm 
Ok brother , i have a idea for that , the problem that comp.txt is large in size , the is in the following function in the porject i sent to you
Code:
   public void write_Compressed() {
        File myFile=new File("comp.txt");
        FileOutputStream fout;
       
         
        try {
            WriteHand=new BufferedWriter(new FileWriter("comp.txt"));
            WriteHand.write(mydata_coded);
            WriteHand.flush();
            WriteHand.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }


as you see i write the "mydata_coded" as a string , in line
Code:
     WriteHand.write(mydata_coded);


As , you know ,the byte is 8bits , the bits in mydata_coded is writen as string (1001010011001 ) in the file ,
you can take each 8 characters and put them as 1byte
1*1+0*2+0*4+.......+1*256 and get the value of 1 byte :huh:

about the class BitInputSream is found this
Code:
http://uio.imagero.com/doc/com/imagero/uio/io/BitInputStream.html

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Author:
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  Re: source code of huffman coding ?
Sun Dec 07, 2008 4:10 am 
ok thank you,man. I will try to do


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