base64_dlgdlg.cpp

base64编码解析 base64编码解析

// Base64_dlgDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Base64_dlg.h"
#include "Base64_dlgDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBase64_dlgDlg dialog

CBase64_dlgDlg::CBase64_dlgDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CBase64_dlgDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CBase64_dlgDlg)
		// 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 CBase64_dlgDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CBase64_dlgDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CBase64_dlgDlg, CDialog)
	//{{AFX_MSG_MAP(CBase64_dlgDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_DECODE, OnDecode)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBase64_dlgDlg message handlers

BOOL CBase64_dlgDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

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

void CBase64_dlgDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// 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 CBase64_dlgDlg::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 CBase64_dlgDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

//转换
BYTE LMoveBit(int base, int MoveNum) 
{ 
	BYTE result=base; 
	if(MoveNum==0)return 1; 
	if(MoveNum==1)return MoveNum; 
	result=base<<(MoveNum-1); 
	return result; 
}
 
//base 64 解密
char* Base64Decode(char *base64code, DWORD base64length) 
{
	char base64_alphabet[]= 
	{'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P', 
	'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f', 
	'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v', 
	'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/','='}; 

	char buf[4]; 

	int i,j,k; 
	int l=0; 

	BYTE temp1[4],temp2; 

	char *Buffer=new char[base64length*3/4]; 

	DWORD base64a=(base64length/4)-1; 

	DWORD base64b=0; 

	for(;base64b<base64a+1;base64b++) 
	{ 
		for(i=0;i<4;i++) 
		{ 
			buf[i]=*(base64code+(base64b*4)+i); 
			for(j=0;j<65;j++) 
			{ 
				if(buf[i]==base64_alphabet[j]) 
				{ 
					temp1[i]=j; 
					break; 
				} 
			} 
		} 
		i--; 
		for(k=1;k<4;k++) 
		{ 
			temp1[i-(k-1)]=temp1[i-(k-1)]/LMoveBit(2,(k-1)*2); 
			temp2=temp1[i-k]; 
			temp2=temp2&(LMoveBit(2,k*2)-1); 
			temp2*=LMoveBit(2,8-(2*k));//move 4 
			temp1[i-(k-1)]=temp1[i-(k-1)]+temp2; 
			Buffer[base64b*3+(3-k)]=temp1[i-(k-1)]; 
		} 
	} 
	return Buffer; 
	
}

void CBase64_dlgDlg::OnDecode() 
{
	char mailCode[]="xOO6w6OsU25haVgNCg0KoaGhodXiysfSu7j2QmFzZTY0tcSy4srU08q8/qOhDQoNCkJlc3QgV2lz" 
		"aGVzIQ0KIAkJCQkNCqGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaEgICAgICAgICAgICAgICBl"
		"U1g/IQ0KoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoSAgICAgICAgICAgICAgIHNuYWl4QHll" 
		"YWgubmV0DQqhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhoaGhICAgICAgICAgMjAwMy0x" 
		"Mi0yNQ0K";
	
	char *decode;
	decode = Base64Decode(mailCode, sizeof(mailCode)) ;
	
	MessageBox(decode);
	
	delete[] decode;
}