利用MFC 生成 CRC32 检验码

// CRC32Dlg.cpp : 实现文件
//

#include "stdafx.h"
#include "CRC32.h"
#include "CRC32Dlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

static unsigned short start_addr = 0x0080;
static unsigned short end_addr   = 0xFFFB;
unsigned long sum=0;
unsigned char fpBuff[20*1024];

unsigned long crc32_table[256] = 
{
  0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
  0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005, 
  0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, 
  0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 
  0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 
  0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
  0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 
  0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd, 
  0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, 
  0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 
  0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
  0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d, 
  0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 
  0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95, 
  0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 
  0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
  0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, 
  0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072, 
  0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 
  0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 
  0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
  0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 
  0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, 
  0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, 
  0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 
  0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
  0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6, 
  0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 
  0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, 
  0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 
  0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
  0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a, 
  0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, 
  0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 
  0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 
  0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
  0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 
  0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b, 
  0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, 
  0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 
  0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
  0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b, 
  0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 
  0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, 
  0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 
  0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
  0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, 
  0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3, 
  0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 
  0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 
  0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
  0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 
  0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, 
  0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, 
  0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 
  0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
  0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, 
  0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 
  0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, 
  0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 
  0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
  0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c, 
  0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, 
  0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 
};


// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

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

// 对话框数据
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

// 实现
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CCRC32Dlg 对话框




CCRC32Dlg::CCRC32Dlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CCRC32Dlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	//  m_list = _T("");
}

void CCRC32Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
	//  DDX_LBString(pDX, IDC_LIST1, m_list);
	DDX_Control(pDX, IDC_LIST1, m_list);
}

BEGIN_MESSAGE_MAP(CCRC32Dlg, CDialogEx)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(Open_file, &CCRC32Dlg::OnBnClickedfile)
	ON_BN_CLICKED(CRC32_calculate, &CCRC32Dlg::OnBnClickedcalculate)
	ON_BN_CLICKED(Clear_data, &CCRC32Dlg::OnBnClickeddata)
END_MESSAGE_MAP()


// CCRC32Dlg 消息处理程序

BOOL CCRC32Dlg::OnInitDialog()
{
	CDialogEx::OnInitDialog();

	// 将“关于...”菜单项添加到系统菜单中。

	// IDM_ABOUTBOX 必须在系统命令范围内。
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

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

	// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
	//  执行此操作
	SetIcon(m_hIcon, TRUE);			// 设置大图标
	SetIcon(m_hIcon, FALSE);		// 设置小图标

	// TODO: 在此添加额外的初始化代码

	return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}

void CCRC32Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialogEx::OnSysCommand(nID, lParam);
	}
}

// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。

void CCRC32Dlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于绘制的设备上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// 使图标在工作区矩形中居中
		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;

		// 绘制图标
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialogEx::OnPaint();
	}
}

//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CCRC32Dlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

unsigned long CCRC32Dlg::fast_crc32(unsigned long sum, unsigned char *p, unsigned long len)
{
  int i=5;
  m_list.AddString("文件中的每个数字生成的CRC32 校验码如下：");//输出checksum 到 列表框
  while (len--)
  {
	  if(i == 0)//从第三个字节开始生成CRC 校验码
	  {
	   p=p+3;
	   i=9;
	  }
	  
      sum = crc32_table[(sum >> 24) ^ *p++] ^ (sum << 8);

	  CString tmp;
	  tmp.Format("%4x",sum); 
	  m_list.AddString(tmp);//输出checksum 到 列表框 

	  UpdateData(FALSE);
  }
 
  return sum;
}

unsigned long CCRC32Dlg::set_crc32_init_value(unsigned long start)
{
  unsigned long init = 0;
  unsigned long byte;
  int val;

  if(start)
    {
      val = 32;
      while( val )
	{
	  val -= 8;
	  byte = (start >> val) & 0xFF;
	  init = crc32_table[((init >> 24) ^ byte) & 0xFF] ^ (init << 8);
	}
    }
  return init;
}


void CCRC32Dlg::OnBnClickedfile()//打开文件
{
	// TODO: 在此添加控件通知处理程序代码
	LPCSTR	lpszPath = "c:\\comdata";
	SetCurrentDirectory( lpszPath );
	static char BASED_CODE szFilter[] = "文本文件(*.txt)|*.bin|所有文件(*.*)|*.*||";

	CFileDialog FileDlg( TRUE,  NULL,  NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
		 szFilter );
	FileDlg.m_ofn.lpstrInitialDir = lpszPath ;

	if( FileDlg.DoModal() ==IDOK )
	{
		CString strFileName = FileDlg.GetFileName( );
		CString strFileExt = FileDlg.GetFileExt( );
		CString lpstrName =  FileDlg.GetPathName( );
		m_strSendFilePathName=lpstrName;
		UpdateData(FALSE);
	}
}


void CCRC32Dlg::OnBnClickedcalculate()//crc32 calculate
{
	// TODO: 在此添加控件通知处理程序代码
	CFile fp;
	if(!(fp.Open((LPCTSTR)m_strSendFilePathName,CFile::modeRead))) 
	{
		AfxMessageBox("Open file failed!");
		return;
	}
	fp.SeekToEnd();
	unsigned long fplength=fp.GetLength();
	m_nFileLength=fplength;
//	char* fpBuff;
	//char fpBuff[10*1024];
//	fpBuff=new char[fplength];
	fp.SeekToBegin();
	if(fp.Read(fpBuff,fplength)<1)
	{
		fp.Close();
		return;
	}
	fp.Close();
    
	
	CString str_count;
	m_list.AddString("整个bin文件的长度为：");//输出checksum 到 列表框
	str_count.Format("%d",fplength);
	m_list.AddString(str_count);//输出整个文件的长度

    m_strTempSendFilePathName=m_strSendFilePathName;
	    
     sum = set_crc32_init_value (CRC_INITIALVALUE);
///  sum = fast_crc32(sum, (unsigned char*)start_addr, end_addr - start_addr + 1);
	 sum = fast_crc32(sum,fpBuff, fplength);

	 CString stmp;
	 m_list.AddString("整个文件生成的CRC32 校验码为：");//输出checksum 到 列表框
	 stmp.Format("%4x",sum);	 
	 m_list.AddString(stmp);//输出checksum 到 列表框

/*     if(sum!=__checksum)
     {
          printf("Checksum failed: 0x%04lX (calculated) ""vs 0x%04lX (from linker)\n", sum, __checksum);                
     }
     else
     {
          printf("* Checksum 0x%04lX is correct! *\n", __checksum);
     }*/
	 UpdateData(FALSE);
}

void CCRC32Dlg::OnBnClickeddata() //clear screen
{
	// TODO: 在此添加控件通知处理程序代码
	 m_list.ResetContent(); //清除list列表框 
     UpdateData(FALSE);  
}