摘要：
Id=2739图像加密使用xxtea进行加密，加密密钥由用户确定。其思想是先使用代码对图像进行加密，然后在程序中使用资源时对其进行解密。
http://cn.cocos2d-x.org/tutorial/show?id=2739
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：
1、首先要加载头文件
2、将图片加密
booljiamiImg(stringinputFileName,stringoutFileName)
{
stringfileName=FileUtils::getInstance()->fullPathForFilename(inputFileName);
if(fileName.empty())
{
returnfalse;
}
DatafileData=FileUtils::getInstance()->getDataFromFile(fileName);
xxtea_longret_len;
unsignedcharkey[100]="lyctianya";
unsignedchar*ret_data=xxtea_encrypt(fileData.getBytes(),(xxtea_long)fileData.getSize(),key,(xxtea_long)strlen("lyctianya"),&ret_len);
if(ret_data==NULL){
returnfalse;
}
FILE*fp=fopen(outFileName.c_str(),"wb+");
if(fp==NULL){
returnfalse;
}
fwrite(ret_data,ret_len,1,fp);
fflush(fp);
fclose(fp);
CC_SAFE_DELETE(ret_data);
returntrue;
}3、加密部分
/*************jiami************/
/*
std::stringoutFileName="/Users/liyongchuang/Desktop/cocosTool/code/myLuaTest/res/jiamiStar.png";
booljiamiRet=jiamiImg("Star.png",outFileName.c_str());
if(jiamiRet){
printf("-----success-----
");
}
else
{
printf("------false------
");
}
*/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
boolisEndWith(std::stringinputStr,std::stringendStr)
{
if(inputStr.empty()||endStr.empty())
{
returnfalse;
}
std::stringnewEndStr=inputStr.substr(inputStr.find_last_of("."));
if(endStr.compare(newEndStr)==0)
{
returntrue;
}
else
{
returnfalse;
}
}
boolImage::initWithImageFile(conststd::string&path)
{
boolret=false;
_filePath=FileUtils::getInstance()->fullPathForFilename(path);
#ifdefEMSCRIPTEN
//Emscriptenincludesare-implementationofSDLthatusesHTML5canvas
//operationsunderneath.Consequently,loadingimagesviaIMG_Load(anSDL
//API)willbealotfasterthanrunninglibpngetalascompiledwith
//Emscripten.
SDL_Surface*iSurf=IMG_Load(fullPath.c_str());
intsize=4*(iSurf->w*iSurf->h);
ret=initWithRawData((constunsignedchar*)iSurf->pixels,size,iSurf->w,iSurf->h,8,true);
unsignedint*tmp=(unsignedint*)_data;
intnrPixels=iSurf->w*iSurf->h;
for(inti=0;i<nrPixels;i++)
{
unsignedchar*p=_data+i*4;
tmp[i]=CC_RGB_PREMULTIPLY_ALPHA(p[0],p[1],p[2],p[3]);
}
SDL_FreeSurface(iSurf);
#else
Datadata;
if(isEndWith(_filePath,".lyc"))
{
DatafileData=FileUtils::getInstance()->getDataFromFile(_filePath);
xxtea_longret_len;
unsignedcharkey[100]="lyctianya";
unsignedchar*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
returnret;
}
boolImage::initWithImageFileThreadSafe(conststd::string&fullpath)
{
boolret=false;
_filePath=fullpath;
Datadata;
if(isEndWith(_filePath,".lyc"))
{
DatafileData=FileUtils::getInstance()->getDataFromFile(_filePath);
xxtea_longret_len;
unsignedcharkey[100]="lyctianya";
unsignedchar*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());
}
returnret;
}顺便附上单独解密代码：
booljiemiImg(stringjiaMiFileName,stringoutFileName)
{
stringfileName=FileUtils::getInstance()->fullPathForFilename(jiaMiFileName);
if(fileName.empty()){
returnfalse;
}
DatafileData=FileUtils::getInstance()->getDataFromFile(fileName);
xxtea_longret_len;
unsignedcharkey[100]="lyctianya";
unsignedchar*ret_data=xxtea_decrypt(fileData.getBytes(),(xxtea_long)fileData.getSize(),key,strlen("lyctianya"),&ret_len);
if(ret_data==NULL){
returnfalse;
}
FILE*fp=fopen(outFileName.c_str(),"wb+");
if(fp==NULL){
returnfalse;
}
fwrite(ret_data,ret_len,1,fp);
fflush(fp);
fclose(fp);
CC_SAFE_DELETE(ret_data);
returntrue;
}/*************jiemi************/
/*
std::stringoutFileName="/Users/liyongchuang/Desktop/cocosTool/code/myLuaTest/res/jiemiStar.png";
booljiaemiRet=jiemiImg("jiamiStar.png",outFileName.c_str());
if(jiaemiRet){
printf("-----success-----
");
}
else
{
printf("------false------
");
}
*/修改lua中的代码，并使用资源：
localfunctionmain()
localgameScene=cc.Scene:create()
locally=cc.LayerColor:create(cc.c4b(0,255,255,255))
gameScene:addChild(ly)
locallb=cc.Label:createWithSystemFont("Helloworld","Arial",20)
ly:addChild(lb)
lb:setPosition(480,320)
localsp=cc.Sprite:create("res/jiamiStar.lyc")
ly:addChild(sp,10)
sp:setPosition(cc.p(480,280))
ifcc.Director:getInstance():getRunningScene()then
cc.Director:getInstance():replaceScene(gameScene)
else
cc.Director:getInstance():runWithScene(gameScene)
end
end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！
unsignedchar*zipFileData=FileUtils::getInstance()->getFileData(zipFilePath.c_str(),"rb",&size); free(zipFileData);