【cocos2d-x 手游研发小技巧（7）图片资源加密，Lua文件加密】

            bool PublicCommen::recode_getFileByName(string pFileName){
    
    unsigned long nSize = 0;
    unsigned char* pBuffer = CCFileUtils::sharedFileUtils()->getFileData(
                                                                         pFileName.c_str(),
                                                                         "rb",&nSize);
    
    unsigned char* newBuf = new unsigned char[nSize];
    int newblen = nSize;
    if(pBuffer!=NULL&&nSize>0)
    {
        for (int i = 0; i<nSize; i++) {
            newBuf[i]=pBuffer[i]+MD5;
        }
        string savepath = pFileName;
        savepath = savepath.substr(0,savepath.length()-4);
        savepath = savepath + "xx.X";
      
        FILE *fp = fopen(savepath.c_str(), "wb+");
        fwrite(newBuf, 1, newblen, fp);
        fclose(fp);
        CCLOG("save file ok. path = %s" ,savepath.c_str());
        returntrue;
    }
    returnfalse;
}

CCTexture2D * CCTextureCache::addImage(constchar * path)
{
    CCAssert(path != NULL, "TextureCache: fileimage MUST not be NULL");

    CCTexture2D * texture = NULL;
    CCImage* pImage = NULL;
    // Split up directory and filename
    // MUTEX:
    // Needed since addImageAsync calls this method from a different thread
    
    //pthread_mutex_lock(m_pDictLock);
    std::string pathKey = path;

    pathKey = CCFileUtils::sharedFileUtils()->fullPathForFilename(pathKey.c_str());
    if (pathKey.size() == 0)
    {
        return NULL;
    }
    texture = (CCTexture2D*)m_pTextures->objectForKey(pathKey.c_str());

    std::string fullpath = pathKey; // (CCFileUtils::sharedFileUtils()->fullPathFromRelativePath(path));if (! texture) 
    {
        std::string lowerCase(pathKey);
        for (unsigned int i = 0; i < lowerCase.length(); ++i)
        {
            lowerCase[i] = tolower(lowerCase[i]);
        }
        // all images are handled by UIImage except PVR extension that is handled by our own handlerdo 
        {
            if (std::string::npos != lowerCase.find(".pvr"))
            {
                texture = this->addPVRImage(fullpath.c_str());
            }
            elseif (std::string::npos != lowerCase.find(".pkm"))
            {
                // ETC1 file format, only supportted on Android
                texture = this->addETCImage(fullpath.c_str());
            }
            else
            {
                CCImage::EImageFormat eImageFormat = CCImage::kFmtUnKnown;
                if (std::string::npos != lowerCase.find(".png"))
                {
                    eImageFormat = CCImage::kFmtPng;
                }
                elseif (std::string::npos != lowerCase.find(".jpg") || std::string::npos != lowerCase.find(".jpeg"))
                {
                    eImageFormat = CCImage::kFmtJpg;
                }
                elseif (std::string::npos != lowerCase.find(".tif") || std::string::npos != lowerCase.find(".tiff"))
                {
                    eImageFormat = CCImage::kFmtTiff;
                }
                elseif (std::string::npos != lowerCase.find(".webp"))
                {
                    eImageFormat = CCImage::kFmtWebp;
                }
                elseif (std::string::npos != lowerCase.find("XX.X"))
                {
                    eImageFormat = CCImage::xxxxx;
                }
                
                pImage = new CCImage();
                CC_BREAK_IF(NULL == pImage);

                bool bRet = pImage->initWithImageFile(fullpath.c_str(), eImageFormat);
                CC_BREAK_IF(!bRet);

                texture = new CCTexture2D();
                
                if( texture &&
                    texture->initWithImage(pImage) )
                {
#if CC_ENABLE_CACHE_TEXTURE_DATA
                    // cache the texture file name                    VolatileTexture::addImageTexture(texture, fullpath.c_str(), eImageFormat);
#endif
                    m_pTextures->setObject(texture, pathKey.c_str());
                    texture->release();
                }
                else
                {
                    CCLOG("cocos2d: Couldn‘t create texture for file:%s in CCTextureCache", path);
                }
            }
        } while (0);
    }

    CC_SAFE_RELEASE(pImage);

    //pthread_mutex_unlock(m_pDictLock);return texture;
}

            bool CCImage::initWithImageFile(constchar * strPath, EImageFormat eImgFmt/* = eFmtPng*/)
{
    bool bRet = false;
    unsigned long nSize = 0;
    unsigned char* pBuffer = CCFileUtils::sharedFileUtils()->getFileData(
                CCFileUtils::sharedFileUtils()->fullPathForFilename(strPath).c_str(),
                "rb",
                &nSize);
    if(eImgFmt==xxxxxx)
    {
        for (int i= 0; i < nSize; i++) {
            pBuffer[i] = pBuffer[i]-MD5;
        }
        pBuffer[nSize] = pBuffer[nSize]-1;
        eImgFmt = kFmtPng;
    }
    
    if (pBuffer != NULL && nSize > 0)
    {
        bRet = initWithImageData(pBuffer, nSize, eImgFmt);
    }
    CC_SAFE_DELETE_ARRAY(pBuffer);
    return bRet;
}