cocos2dx 图片资源加密

图片加密使用xxtea来加密，加密秘钥自己定，思路就是自己使用代码首先将图片加密，在程序中使用的时候，在加载图片资源处再将资源解密

加密代码如下：

首先要加载头文件

2、将图片加密

bool jiamiImg(string inputFileName,string outFileName){    string fileName=FileUtils::getInstance()->fullPathForFilename(inputFileName);        if(fileName.empty())    {        return  false;    }        Data fileData=FileUtils::getInstance()->getDataFromFile(fileName);    xxtea_long ret_len;    unsigned char key[100]="lyctianya";    unsigned char* ret_data= xxtea_encrypt(fileData.getBytes(), (xxtea_long)fileData.getSize(),key, (xxtea_long)strlen("lyctianya"), &ret_len);        if (ret_data==NULL) {        return false;    }        FILE*fp=fopen(outFileName.c_str(), "wb+");    if (fp==NULL) {        return false;    }    fwrite(ret_data, ret_len, 1, fp);    fflush(fp);    fclose(fp);    CC_SAFE_DELETE(ret_data);        return true;    }

3.加密部分

    /*************jiami************/    /*    std::string outFileName="/Users/liyongchuang/Desktop/cocosTool/code/myLuaTest/res/jiamiStar.png";    bool jiamiRet=jiamiImg("Star.png",outFileName.c_str());    if (jiamiRet) {        printf("-----success-----\n");    }    else    {        printf("------false------\n");    }     */

4、加密后生成的文件

5、修改加载图片资源处，并使用解密

修改

加入并修改如下代码：头文件自己加

bool isEndWith(std::string inputStr,std::string endStr){    if (inputStr.empty()||endStr.empty())    {        return false;    }    std::string newEndStr = inputStr.substr(inputStr.find_last_of("."));    if (endStr.compare(newEndStr) == 0)    {        return true;    }    else    {        return false;    }}bool Image::initWithImageFile(const std::string& path){    bool ret = false;    _filePath = FileUtils::getInstance()->fullPathForFilename(path);#ifdef EMSCRIPTEN    // Emscripten includes a re-implementation of SDL that uses HTML5 canvas    // operations underneath. Consequently, loading images via IMG_Load (an SDL    // API) will be a lot faster than running libpng et al as compiled with    // Emscripten.    SDL_Surface *iSurf = IMG_Load(fullPath.c_str());    int size = 4 * (iSurf->w * iSurf->h);    ret = initWithRawData((const unsigned char*)iSurf->pixels, size, iSurf->w, iSurf->h, 8, true);    unsigned int *tmp = (unsigned int *)_data;    int nrPixels = iSurf->w * iSurf->h;    for(int i = 0; i < nrPixels; i++)    {        unsigned char *p = _data + i * 4;        tmp[i] = CC_RGB_PREMULTIPLY_ALPHA( p[0], p[1], p[2], p[3] );    }    SDL_FreeSurface(iSurf);#else    Data data;    if (isEndWith(_filePath, ".lyc"))    {        Data fileData=FileUtils::getInstance()->getDataFromFile(_filePath);        xxtea_long ret_len;        unsigned char key[100]="lyctianya";        unsigned char*ret_data=xxtea_decrypt(fileData.getBytes(), (xxtea_long)fileData.getSize(), key, strlen("lyctianya"), &ret_len);        data.fastSet(ret_data, ret_len);    }    else    {        data = FileUtils::getInstance()->getDataFromFile(_filePath);    }    if (!data.isNull())    {        ret = initWithImageData(data.getBytes(), data.getSize());    }#endif // EMSCRIPTEN    return ret;}bool Image::initWithImageFileThreadSafe(const std::string& fullpath){    bool ret = false;    _filePath = fullpath;        Data data;    if (isEndWith(_filePath, ".lyc"))    {        Data fileData=FileUtils::getInstance()->getDataFromFile(_filePath);        xxtea_long ret_len;        unsigned char key[100]="lyctianya";        unsigned char*ret_data=xxtea_decrypt(fileData.getBytes(), (xxtea_long)fileData.getSize(), key, strlen("lyctianya"), &ret_len);        data.fastSet(ret_data, ret_len);    }    else    {        data = FileUtils::getInstance()->getDataFromFile(_filePath);    }        if (!data.isNull())    {        ret = initWithImageData(data.getBytes(), data.getSize());    }        return ret;}

顺便附上单独解密代码：

bool jiemiImg(string jiaMiFileName,string outFileName){    string fileName=FileUtils::getInstance()->fullPathForFilename(jiaMiFileName);    if (fileName.empty()) {        return false;    }    Data fileData=FileUtils::getInstance()->getDataFromFile(fileName);    xxtea_long ret_len;    unsigned char key[100]="lyctianya";    unsigned char*ret_data=xxtea_decrypt(fileData.getBytes(),(xxtea_long)fileData.getSize(), key, strlen("lyctianya"), &ret_len);    if (ret_data==NULL) {        return false;    }    FILE*fp=fopen(outFileName.c_str(),"wb+");    if (fp==NULL) {        return false;    }    fwrite(ret_data, ret_len, 1, fp);    fflush(fp);    fclose(fp);    CC_SAFE_DELETE(ret_data);    return true;}

    /*************jiemi************/    /*     std::string outFileName="/Users/liyongchuang/Desktop/cocosTool/code/myLuaTest/res/jiemiStar.png";     bool jiaemiRet=jiemiImg("jiamiStar.png",outFileName.c_str());     if (jiaemiRet) {     printf("-----success-----\n");     }     else     {     printf("------false------\n");     }    */

修改lua中的代码，并使用资源

local function main()    local gameScene=cc.Scene:create()    local ly=cc.LayerColor:create(cc.c4b(0,255,255,255))    gameScene:addChild(ly)        local lb=cc.Label:createWithSystemFont("Hello world","Arial",20)    ly:addChild(lb)    lb:setPosition(480,320)    local sp=cc.Sprite:create("res/jiamiStar.lyc")    ly:addChild(sp, 10)    sp:setPosition(cc.p(480,280))    if cc.Director:getInstance():getRunningScene()  then    cc.Director:getInstance():replaceScene(gameScene)    else    cc.Director:getInstance():runWithScene(gameScene)    endend

下面看结果：

顺便提一下，大家有没有发现一个问题，我的一些资源用了没有释放哦！

unsigned char *zipFileData =FileUtils::getInstance()->getFileData(zipFilePath.c_str(),"rb", &size);

free(zipFileData);