import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.util.Hashtable;

import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.*;

public class QRCode {
	
public  String m_encoding=""  ;
public  boolean m_sts= true   ;  
public  String m_ErrorInfo="" ;
public  String m_Output=""    ;	
public  int m_debug= 0        ;


public QRCode() 
	{
		this.m_encoding ="";
		this.m_sts=true    ;
		this.m_ErrorInfo="";
		this.m_debug=0     ;
	}

	
public void setEncoding(String enc)
{
	this.m_encoding=enc;
}

public void setDebug(int  debug)
{
	this.m_debug=debug;
}
	
public void makeQRCode(byte[] b,int w,int h,String filename)
{
     m_sts=true ;
	 
    String data="";
	BitMatrix matrix = null;
	
    try {
         if  (m_encoding.length()>0) data = new String(b,m_encoding);
			 else    data = new String(b,"UTF-8");
    } catch (Exception e) 
	
		{
         m_sts=false ; 
		 if (e.getMessage()==null) m_ErrorInfo="ERROR(1): UnsupportedEncoding"; 
		     else m_ErrorInfo="ERROR(1): " + e.getMessage();
		if (m_debug>0) e.printStackTrace();	 
   	    }
	
	if (!m_sts) return ; 
	
    try
    { 	
	
        com.google.zxing.Writer writer = new MultiFormatWriter();
       
        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(2);
        if (m_encoding.length()>0)  hints.put(EncodeHintType.CHARACTER_SET, m_encoding); 
		     else hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        matrix = writer.encode(data,com.google.zxing.BarcodeFormat.QR_CODE, w, h, hints);
      
	} catch (com.google.zxing.WriterException e) 
	    {
         m_sts=false ; 
		 if (e.getMessage()==null) m_ErrorInfo="ERROR(2): MultiFormatWriter error "; 
		   else m_ErrorInfo="ERROR(2): " + e.getMessage();
		   
		 if (m_debug>0) e.printStackTrace();
        }
		
	if (!m_sts) return ; 
	
    try
    { 	
        File file = new File(filename);
		
        MatrixToImageWriter.writeToFile(matrix, "PNG", file);
       
    m_ErrorInfo=filename;   
    } catch (Exception e) {
        m_sts=false ; 
		if (e.getMessage()==null) m_ErrorInfo="ERROR(3): Error creating file "+filename; 
		   else m_ErrorInfo="ERROR(3): " + e.getMessage();
	  if (m_debug>0) e.printStackTrace(); 
    }
}

public String getErrInfo()
  {
   return this.m_ErrorInfo ;
  } 
  
public boolean getStatus()
  {
   return this.m_sts ;
  } 

public String Version()
{
   return "1.0" ;	
}  

public static void main(String[] args)
  {
    System.out.println("QRCode v.1.0");
	if (args.length < 1) {
        System.err.println("Usage:");
        System.err.println("java QRCode file");
        }
	
	else
	{
    String outFile = args[args.length-1];		
	QRCode qr=new QRCode(); 
    qr.makeQRCode("Test".getBytes(),100,100,outFile) ; 
     if (qr.getStatus()) 
		{
		 System.out.println("File "+outFile+ " created"); 
		}
		else 
		{
		 System.out.println(qr.getErrInfo());
		}		 
    } 	 
  }

}