stgraphdlg.cpp

将文本文件隐藏在一个BMP文件里 达到信息隐藏的目的

// StGraphDlg.cpp : implementation file
//

#include "stdafx.h"
#include "StGraph.h"
#include "StGraphDlg.h"
#include "FileDlg.h"
#include <math.h>
#include "ResulrDlg.h"
#include "Password.h"


#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CStGraphDlg dialog

CStGraphDlg::CStGraphDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CStGraphDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CStGraphDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CStGraphDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CStGraphDlg)
	DDX_Control(pDX, IDC_PROGRESS1, m_progress);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CStGraphDlg, CDialog)
	//{{AFX_MSG_MAP(CStGraphDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnSource)
	ON_BN_CLICKED(IDC_BUTTON2, OnBMP)
	ON_BN_CLICKED(IDC_BUTTON3, OnRecover)
	ON_BN_CLICKED(IDC_BUTTON4, OnDO_IT)
	ON_BN_CLICKED(ID_about, OnAbout)
	ON_WM_CLOSE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CStGraphDlg message handlers

BOOL CStGraphDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here

	AfxMessageBox("I hope you enjoy my program . ");

	srcBin=new char [2];
	srcBMP=new char [2];

	CreateBinLookUpTable();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CStGraphDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CStGraphDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CStGraphDlg::OnAbout ()
{

	AfxMessageBox("Hi All , Me 'Ahmed Osama', Communication & Electronics Engineer :) [e-mail]");

}


void CStGraphDlg::OnSource() 
{
	// TODO: Add your control notification handler code here

// ** Opening the text file & reading every byte and converting	**
// ** to binary bits to be stored in array						**

CFileDlg dlg(TRUE,"txt",NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,"text (*.txt)|*.txt|");
dlg.DoModal ();
CFile f;
if (!f.Open ((LPCTSTR)dlg.GetPathName (),CFile::modeRead|CFile::typeBinary ))
      return;

int l=f.GetLength (); // ** Getting the text file size **


CPassword enterpassword;
again:
enterpassword.DoModal ();// ** Showing the password entry dialog **

if (enterpassword.m_password1!=enterpassword.m_password2)
{   AfxMessageBox("Check your password , the two passwords are not matching !!!");      
	goto again;}

if (enterpassword.m_password1.GetLength ()!=5)
{
	AfxMessageBox("Check your password , less than 5 letters !!!");
	goto again;
}



char *buffer = new char [l];
	
	// ** buffer which will contain the text file

CString temp;
int a=0;
delete [] srcBin;
binLen=(l+5+5)*8; // ** Calc. the binary array size 

// ** size=(each byte of text +each byte of the pass+
// **		each byte of 5 digit no) * (8 bits per byte)

srcBin=new char [binLen]; // ** binary array for the text file	**

f.ReadHuge (buffer,l);

char buffer1[50];
_gcvt( l , 10, buffer1 );//** Converte txt file size no to str	 **
CString temp1=buffer1;// ** if txt file is 20 bytes -->temp1="20."*

temp1=temp1.Left (temp1.GetLength ()-1);// ** Removing the point **	

CString temp2="0";

// ** We assuming the max txt file size is 99999 (5 digits)	**
// ** So to be sure that it is always 5 digits				**
// ** after converting the txt size to str we add extra zero**
// ** Example  txt size is 20 bytes
// ** will be conv. to "20" ---fixing it to --- "00020"		**

if (temp1.GetLength ()<5)
{
	for (int k=1 ; k<5-temp1.GetLength () ; k++)
		temp2=temp2+"0";
}

temp2=temp2+temp1+enterpassword.m_password1;
temp2=temp2.Left (10);

// ** temp2  holds the header which will be added to the txt file**
// ** temp2="the fixed txt file size"(5 digits)+"password"		 **


CString temp3(buffer); // ** temp3 hold now the raw text file	  **
temp3.Insert (0,temp2);// ** Adding the header to the raw txt file**



for (int i=0 ; i<(binLen/8) ;i++)
	{
		
// ** Converting each byte to bin bits and storing in in	**
// ** the srcBin array.										**
		
		temp=bin[(unsigned char)temp3[i]];
		
// ** Example 'a'--->ascii--->97--->bin[97]="01100001"
// ** putting each bit in the srcBin array
// ** 0--->srcBin[a]
// ** 1--->srcBin[a+1]         and So on........

		srcBin[a]=temp[0];
		srcBin[a+1]=temp[1];
		srcBin[a+2]=temp[2];
		srcBin[a+3]=temp[3];
		srcBin[a+4]=temp[4];
		srcBin[a+5]=temp[5];
		srcBin[a+6]=temp[6];
		srcBin[a+7]=temp[7];

		a=a+8; 
}



delete [] buffer;

f.Close ();

CWnd * koko=GetDlgItem (IDC_BUTTON2);
koko->EnableWindow ();

AfxMessageBox("Text File Loaded");
}

void CStGraphDlg::OnBMP() 
{
// ** This function handle opening the raw bmp file to hide in it thr txt	**

CFileDlg dlg(TRUE,"bmp",NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,"Only BMP (*.bmp)|*.bmp|");
dlg.DoModal ();

if (!bmpFile.Open ((LPCTSTR)dlg.GetPathName (),CFile::modeReadWrite|CFile::typeBinary ))
     return;

int l=bmpFile.GetLength ();

bmpLen=l;	// ** contains the bmp file length(size)	**

delete [] srcBMP;

srcBMP=new char [l]; // ** This is the buffer which will contains the bmp file	**

bmpFile.ReadHuge (srcBMP,l); // ** Loading the bmp file into the buffer	**

AfxMessageBox("File Loaded");


CWnd * koko=GetDlgItem (IDC_BUTTON4);

koko->EnableWindow (); // ** Activate "Hide Text" button	**






}

void CStGraphDlg::OnRecover() 
{

// ** This function used to recover the txt file from the bmp	**

ResulrDlg dllg;

int min,max;
m_progress.GetRange (min,max);
m_progress.SetPos (min);

CFileDlg dlg(TRUE,"bmp",NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,"Only BMP (*.bmp)|*.bmp|");
dlg.DoModal ();
CFile f;
if (!f.Open ((LPCTSTR)dlg.GetPathName (),CFile::modeReadWrite|CFile::typeBinary ))
   return;

int l=f.GetLength ();	// ** l=the bmp size	**
char *buffer = new char [l] ; // ** buffer which will hold the bmp file	**
int *recBin=new int [l]; // ** buffer which will hold the bmp fle bits	**

char temp;

CString mssg;


f.ReadHuge (buffer,l);	// ** loading the bmp file to the buffer	**
CString temp1=buffer;// ** temp1 holds the bmp file					**




for(int j=55 ; j<55+8*10 ;j++)
{
	recBin[j]=(unsigned char) ((unsigned char)buffer[j] & 1);
	// ** conveting each byte in the bmp(after the header) to bits	**
	// ** stored in the recBin array								**
}


for (j=55 ; j<55+8*10 ;j=j+8)
{
	temp=128*recBin[j]+64*recBin[j+1]+32*recBin[j+2]+16*recBin[j+3]+8*recBin[j+4]+4*recBin[j+5]+2*recBin[j+6]+1*recBin[j+7];
	mssg=mssg+temp;

	// ** reading the last bit in each 8 bit							**
	// ** converting them to decimal again (ascii code)					**
	// ** but just the first 10 bytes (our header which contain the pass**
	// ** and the txt file size											**
}


CPassword enterpassword;

enterpassword.hide =true; 
int ii=1;
again :
enterpassword.DoModal ();

	// ** our header consist of two part as we knew each 5 bytes	**
	// **      txt file size    +       pass

// ** checking the password
if (enterpassword.m_password1 !=mssg.Right (5))
{
	AfxMessageBox("Bad Password !! ");

}

else
{
goto safe;
}

ii++;
if (ii<4) goto again;

if (ii==4) this->DestroyWindow (); 
		// ** after three trials the program exit **

safe:

int length=atoi(mssg.Left(5) );
// ** getting the txt file size but it is string
// ** so converting it back to int using atoi() function

m_progress .SetRange (55,2*l-8);
// ** setting the min and max limit for the progress bar	**


for(int i=55+8*10 ; i<55+8*10+length*8;i++)
{
	recBin[i]=(unsigned char) ((unsigned char)buffer[i] & 1);

	// ** reading the bits of the txt file						**
}



mssg="";

for (i=55+8*10 ; i<55+8*10+length*8 ;i=i+8)