haffmandlg.cpp

哈夫曼压缩解压缩的编码。很好的思路和方法。希望能够对大家有所帮助。

// HaffmanDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Haffman.h"
#include "HaffmanDlg.h"
#include<fstream>
#include<iostream>
#include<String>
#include<cmath>
using namespace std;

#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()

/////////////////////////////////////////////////////////////////////////////
// CHaffmanDlg dialog

CHaffmanDlg::CHaffmanDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CHaffmanDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CHaffmanDlg)
	m_Addr1 = _T("");
	m_Addr = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CHaffmanDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CHaffmanDlg)
	DDX_Text(pDX, IDC_ADDR1, m_Addr1);
	DDX_Text(pDX, IDC_ADDR, m_Addr);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CHaffmanDlg, CDialog)
	//{{AFX_MSG_MAP(CHaffmanDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_COMPRESS, OnCompress)
	ON_BN_CLICKED(IDC_UNCOMPRESS, OnUncompress)
	ON_BN_CLICKED(IDC_FILE_OPEN, OnFileOpen)
	ON_BN_CLICKED(IDC_FILE_OPEN1, OnFileOpen1)
	ON_EN_CHANGE(IDC_ADDR, OnChangeAddr)
	ON_EN_CHANGE(IDC_ADDR1, OnChangeAddr1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CHaffmanDlg message handlers

BOOL CHaffmanDlg::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 CHaffmanDlg::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 CHaffmanDlg::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 CHaffmanDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

/******************************************************************************************************/
////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////
////////                               我的代码										///////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////
/******************************************************************************************************/
struct HTNode
{
    char data;
    int weight;  //权值;
    int parent;
    int lchild;
    int rchild;
};

typedef char* HCode;

HTNode *ht;
HCode *hcd;
int maplist[256];		//建立字符与哈夫曼编码的映射
int nodenum=0;         //哈夫曼树结点数
int rearnum=0;          //哈夫曼编码尾补码
int textlen=0;          //需压缩的文件长度
int codelen=0;          //压缩后的文件的哈夫曼编码总长度
int const bufferlen=1024;               //设置读取缓冲区长度

class function
{private:
 int clean();								
 void Dec2Bin(int num,int bin[8]);			//十进制转二进制函数
 bool InitFromFile(string fileadd);			//打开文件
 void HTCreat(HTNode ht[],int n);			//构造哈夫曼树
 void HCCreat(HTNode ht[],HCode hcd[],int n);//构造哈夫曼编码
 void WriteFile(char *tmp);
 unsigned char ConvertBinary(char *tmp);		//压缩 写入文件
 void ConvertFile(HCode hcd[],string fileadd,string fileadd2);
 void DecompressionFile(string fileadd2,string fileadd3);
public:
 string Compression(string fileadd);
 string Decompression(string fileadd2);
};

int function::clean()
{
    delete ht;
	delete hcd;
	return 1;
}
void function::Dec2Bin(int num,int bin[8])
{
    int i=0;
    for(i=0;i<8;i++)
    {
        bin[i]=0;
    }
    i=0;
    while(num>0)
    {
        bin[8-1-i]=num%2;
        num=num/2;
        i++;
    }
}

//////////////打开文件//////////////
bool function::InitFromFile(string fileadd)
{

	 fstream infile(fileadd.c_str(),ios::binary|ios::in);
     if(!infile)
	 {
		 MessageBox(NULL,"error!","error!",MB_OK);
		 return 0;
	 }
     int table[256];
     int i,j;
     int len=0,num=0;
     unsigned char ch;

     for(i=0;i<256;i++) {table[i]=0;maplist[i]=-1;}

     int readlen=0;
     char buffer[bufferlen];          //设置读取缓冲区
     do
     {
         infile.read(buffer,bufferlen);
         i=0;
         readlen=infile.gcount();
    	 while(i<readlen)
			   {
               ch=(unsigned char)buffer[i];
               table[ch]++;
               len++;
               i++;
			   }
    }
    while(readlen==bufferlen);

	for(i=0;i<256;i++)
    {
        if(table[i]!=0) num++;
    }

    ht=new HTNode[2*num-1];
    hcd=new HCode[num];
    for(i=0,j=0;i<256;i++)
    {
        if(table[i]!=0)
        {
             ht[j].data=i;
             ht[j].weight=table[i];
             maplist[i]=j;  //建立字符与哈夫曼编码的映射
             j++;

        }
    }
    nodenum=num;
    textlen=len;
    infile.clear();
	infile.close();
    return 1;
}
//////////////构造哈夫曼树////////////
void function::HTCreat(HTNode ht[],int n)
{
    int i,k,lnode,rnode;
    int min1,min2;
    for(i=0;i<2*n-1;i++)
    {
        ht[i].parent=ht[i].rchild=ht[i].lchild=-1;
		
    }
    for(i=n;i<2*n-1;i++)
    {
        min1=min2=2147483647;
        lnode=rnode=-1;
        for(k=0;k<=i-1;k++)
        {
            if(ht[k].parent==-1)
            {
                if(ht[k].weight<min1)
                {
                    min2=min1;
                    min1=ht[k].weight;
                    rnode=lnode;
                    lnode=k;
                }
                else if(ht[k].weight<min2)
                {
                    min2=ht[k].weight;
                    rnode=k;
                }
            }
        }
		ht[lnode].parent=i;
        ht[rnode].parent=i;
        ht[i].weight=ht[lnode].weight+ht[rnode].weight;
        ht[i].lchild=lnode;
        ht[i].rchild=rnode;
    }
}

///////////构造哈夫曼编码/////////////


void function::HCCreat(HTNode ht[],HCode hcd[],int n)
{
    int i,p,c;
    HCode hc;
    hc=new char[n];
    int start,tmplen;

    for(i=0;i<n;i++)
    {
        tmplen=0;
        start=n-1;
        hc[start]='\0';
        c=i;
        p=ht[i].parent;
        while(p!=-1)
        {
            if(ht[p].lchild==c)  //是左孩子结点
            {
                hc[--start]='0';
                tmplen++;
            }
            else
            {
                hc[--start]='1';
                tmplen++;