C++ 递归遍历文件并计算MD5

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递归遍历文件夹，对比文件md5

首先，需要引用 md5 的相关代码，参考这篇文章，防止链接内容被删除，这里再记录一次：
md5.h

    #ifndef MD5_H
    #define MD5_H

    #include 
    #include 

    /* Type define */
    typedef unsigned char byte;
    typedef unsigned int uint32;

    using std::string;
    using std::ifstream;

    /* MD5 declaration. */
    class MD5 {
    public:
    MD5();
    MD5(const void* input, size_t length);
    MD5(const string& str);
    MD5(ifstream& in);
    void update(const void* input, size_t length);
    void update(const string& str);
    void update(ifstream& in);
    const byte* digest();
    string toString();
    void reset();

    private:
    void update(const byte* input, size_t length);
    void final();
    void transform(const byte block[64]);
    void encode(const uint32* input, byte* output, size_t length);
    void decode(const byte* input, uint32* output, size_t length);
    string bytesToHexString(const byte* input, size_t length);

    /* class uncopyable */
    MD5(const MD5&);
    MD5& operator=(const MD5&);

    private:
    uint32 _state[4]; /* state (ABCD) */
    uint32 _count[2]; /* number of bits, modulo 2^64 (low-order word first) */
    byte _buffer[64]; /* input buffer */
    byte _digest[16]; /* message digest */
    bool _finished;   /* calculate finished ? */

    static const byte PADDING[64]; /* padding for calculate */
    static const char HEX[16];
    enum { BUFFER_SIZE = 1024 };
    };

    #endif /*MD5_H*/

md5.cpp

    #include "md5.h"

    using namespace std;

    /* Constants for MD5Transform routine. */
    #define S11 7
    #define S12 12
    #define S13 17
    #define S14 22
    #define S21 5
    #define S22 9
    #define S23 14
    #define S24 20
    #define S31 4
    #define S32 11
    #define S33 16
    #define S34 23
    #define S41 6
    #define S42 10
    #define S43 15
    #define S44 21


    /* F, G, H and I are basic MD5 functions.
    */
    #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
    #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
    #define H(x, y, z) ((x) ^ (y) ^ (z))
    #define I(x, y, z) ((y) ^ ((x) | (~z)))

    /* ROTATE_LEFT rotates x left n bits.
    */
    #define ROTATE_LEFT(x, n) (((x) > (32-(n))))

    /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
    Rotation is separate from addition to prevent recomputation.
    */
    #define FF(a, b, c, d, x, s, ac) {     (a) += F ((b), (c), (d)) + (x) + ac;     (a) = ROTATE_LEFT ((a), (s));     (a) += (b);     }
    #define GG(a, b, c, d, x, s, ac) {     (a) += G ((b), (c), (d)) + (x) + ac;     (a) = ROTATE_LEFT ((a), (s));     (a) += (b);     }
    #define HH(a, b, c, d, x, s, ac) {     (a) += H ((b), (c), (d)) + (x) + ac;     (a) = ROTATE_LEFT ((a), (s));     (a) += (b);     }
    #define II(a, b, c, d, x, s, ac) {     (a) += I ((b), (c), (d)) + (x) + ac;     (a) = ROTATE_LEFT ((a), (s));     (a) += (b);     }


    const byte MD5::PADDING[64] = { 0x80 };
    const char MD5::HEX[16] = {
    ‘0‘, ‘1‘, ‘2‘, ‘3‘,
    ‘4‘, ‘5‘, ‘6‘, ‘7‘,
    ‘8‘, ‘9‘, ‘a‘, ‘b‘,
    ‘c‘, ‘d‘, ‘e‘, ‘f‘
    };


    /* Default construct. */
    MD5::MD5() {
    reset();
    }

    /* Construct a MD5 object with a input buffer. */
    MD5::MD5(const void* input, size_t length) {
    reset();
    update(input, length);
    }

    /* Construct a MD5 object with a string. */
    MD5::MD5(const string& str) {
    reset();
    update(str);
    }

    /* Construct a MD5 object with a file. */
    MD5::MD5(ifstream& in) {
    reset();
    update(in);
    }

    /* Return the message-digest */
    const byte* MD5::digest() {

    if (!_finished) {
       _finished = true;
       final();
    }
    return _digest;
    }

    /* Reset the calculate state */
    void MD5::reset() {

    _finished = false;
    /* reset number of bits. */
    _count[0] = _count[1] = 0;
    /* Load magic initialization constants. */
    _state[0] = 0x67452301;
    _state[1] = 0xefcdab89;
    _state[2] = 0x98badcfe;
    _state[3] = 0x10325476;
    }

    /* Updating the context with a input buffer. */
    void MD5::update(const void* input, size_t length) {
    update((const byte*)input, length);
    }

    /* Updating the context with a string. */
    void MD5::update(const string& str) {
    update((const byte*)str.c_str(), str.length());
    }

    /* Updating the context with a file. */
    void MD5::update(ifstream& in) {

    if (!in) {
       return;
    }

    std::streamsize length;
    char buffer[BUFFER_SIZE];
    while (!in.eof()) {
       in.read(buffer, BUFFER_SIZE);
       length = in.gcount();
       if (length > 0) {
        update(buffer, length);
       }
    }
    in.close();
    }

    /* MD5 block update operation. Continues an MD5 message-digest
    operation, processing another message block, and updating the
    context.
    */
    void MD5::update(const byte* input, size_t length) {

    uint32 i, index, partLen;

    _finished = false;

    /* Compute number of bytes mod 64 */
    index = (uint32)((_count[0] >> 3) & 0x3f);

    /* update number of bits */
    if ((_count[0] += ((uint32)length > 29);

    partLen = 64 - index;

    /* transform as many times as possible. */
    if (length >= partLen) {

       memcpy(&_buffer[index], input, partLen);
       transform(_buffer);

       for (i = partLen; i + 63 > 3) & 0x3f);
    padLen = (index > 8) & 0xff);
       output[j + 2] = (byte)((input[i] >> 16) & 0xff);
       output[j + 3] = (byte)((input[i] >> 24) & 0xff);
    }
    }

    /* Decodes input (byte) into output (ulong). Assumes length is
    a multiple of 4.
    */
    void MD5::decode(const byte* input, uint32* output, size_t length) {

    for (size_t i = 0, j = 0; j 

调用例子:

    #include "md5.h"
    #include 

    using namespace std;

    void PrintMD5(const string& str, MD5& md5) {
          cout 

配置好了以后开始写我们的递归遍历函数：

/*	遍历目录下所有文件,对比 md5
	path：文件夹路径（末尾不要有‘\‘）
	format：要筛选的文件后缀名
	str_md5：md5 字符串
	isFound：是否匹配到与 str_md5 相等的 md5 值
*/ 
void findAllFile_MD5(const char * path,const char * format,string str_md5,BOOL &isFound)
{
	// 路径末尾追加 ‘\*.*‘
    char newpath[200];
    strcpy(newpath, path);
    strcat(newpath, "\\*.*");
    
   // 找到目录下的第一个文件 #include 
	_finddata_t findData;
	/*	文件信息结构体
		struct _finddata_t{
             unsigned attrib;			// 文件属性
             time_t time_create;		// 创建时的时间戳
             time_t time_access;		// 最后一次被访问时的时间戳
             time_t time_write;			// 最后一次被修改时的时间戳
             _fsize_t size;				// 文件字节大小
             char name[_MAX_FNAME];		// 文件名
        };
	*/
	long handle = _findfirst(newpath, &findData);
	if (handle == -1){return;}     
     
	// 遍历文件和文件夹
    while (_findnext(handle, &findData) == 0){
        // 文件夹
		if (findData.attrib & _A_SUBDIR){
			// 文件夹名不能有敏感字符 ‘.‘、‘..‘
			if (strcmp(findData.name, ".") == 0 || strcmp(findData.name, "..") == 0){continue;}
                
			// 进入这个文件夹继续遍历
            strcpy(newpath, path);
            strcat(newpath, "\\");
            strcat(newpath, findData.name);
            findAllFile_MD5(newpath,format,str_md5,isFound);
		}
		// 文件
        else{
			// 判断是不是指定后缀的文件
            if(strstr( findData.name,format)){    
                // 输出（用来测试）
				//cout 

调用例子（遍历%temp% 下的文件）

	// 获取 %temp% 目录
	TCHAR lpTempPathBuffer[MAX_PATH];
	GetTempPath(MAX_PATH,lpTempPathBuffer);

	// 删除末尾 ‘\‘
	string str_tempPath = lpTempPathBuffer;
	str_tempPath = str_tempPath.substr(0,str_tempPath.length()-1);

	// 遍历目录下所有 exe 文件,匹配 MD5
	BOOL isFound = FALSE;
	findAllFile_MD5(stringToCharP(str_tempPath),".exe","52f5ce92c6f72c7e193b560bf4e76330",isFound);
	if(isFound){cout 

C++ 递归遍历文件并计算MD5

标签：关闭   时间戳   orm   后缀   搜索   mpp   type   object   append   

原文地址：https://www.cnblogs.com/LyShark/p/15019665.html