文件打包代码更新 使用json记录打包文件信息

经过之前的几次试验 决定使用json记录打包文件信息

#include "Package.h" #include "json/json.h" #include <string> #include <iostream>   /************************************************************** 技术博客 http://www.cnblogs.com/itdef/    技术交流群 群号码：324164944    欢迎c c++ windows驱动爱好者 服务器程序员沟通交流 **************************************************************/   bool Package::CreatePackage(const char* packFileName) {     bool bRet = false;       fpPackage_ = fopen(packFileName,"wb+");     if (NULL == fpPackage_)         return bRet;       bRet = true;     return bRet; }   void Package::AddFileToList(const char* fileName) {     fileList.push_back(fileName); }   bool Package::OpenPackageForUnPack(const char* packFileName) {     if (NULL != fpPackage_)         fclose(fpPackage_);       fpPackage_ = fopen(packFileName, "rb");     if (NULL == fpPackage_)         return false;       return true; }   bool Package::CopyFileContent(FILE* src, FILE* dsc) {     char* buf = new char[CopyBufSize];     if (NULL == buf)         return false;       while (1) {         int nReadBytes = fread(buf,1, CopyBufSize, src);         //写入包裹         fwrite(buf, 1, nReadBytes, dsc);         //如果读取到的数据比缓冲区小，那么说明读取结束了         if (nReadBytes < sizeof(buf))         {             break;         }     }     //fflush是确保我们的数据写入到磁盘上了     fflush(dsc);     return true; }   bool  Package::PackageOneFile(const char*name) {     bool bRet = false;       FILE* fp = fopen(name, "rb");     if (NULL == fp)     return bRet;       //获取文件长度     _fseeki64(fp, 0, SEEK_END); //定位到文件末     __int64 filelength = _ftelli64(fp);     _fseeki64(fp, 0, SEEK_SET);       //获取PACKAGE文件当前偏移     __int64 currentOffset = _ftelli64(fpPackage_);       //开始打包     CopyFileContent(fp, fpPackage_);       FILEINFO fileInfo;     fileInfo.filename = name;     fileInfo.fileSize = filelength;     fileInfo.offsetInPackFile = currentOffset;       fileInfoList.push_back(fileInfo);     fclose(fp);     return bRet; }   bool Package::GetUnpackFileInfo() {     fileInfoList.clear();     __int64 jsonOffset = 0;     fread(&jsonOffset,1,sizeof(jsonOffset), fpPackage_);       //获取文件长度     _fseeki64(fpPackage_, 0, SEEK_END); //定位到文件末     __int64 filelength = _ftelli64(fpPackage_);     _fseeki64(fpPackage_, 0, SEEK_SET);       _fseeki64(fpPackage_, jsonOffset, SEEK_SET);     char* jsonBuf = new char[filelength - jsonOffset];     if (NULL == jsonBuf)         return false;     fread(jsonBuf,filelength - jsonOffset,1, fpPackage_);       //解析json字符串     Json::Reader pJsonParser;;     Json::Value tempVal;       if (!pJsonParser.parse(jsonBuf, tempVal))     {         std::cout << "parse error" << std::endl;         delete[] jsonBuf;         return false;     }       Json::Value array = tempVal["array"];     for (int i = 0; i < array.size(); i++) {         std::cout << array[i]["Filename"].asString() << std::endl;         std::cout << array[i]["FileSize"].asInt64() << std::endl;         std::cout << array[i]["Offset"].asInt64() << std::endl;     }       delete[] jsonBuf;     return true; }     bool Package::WriteFileInfoToPackFile() {       //获取PACKAGE文件当前偏移 写入JSON文件信息的偏移     __int64 currentOffset = _ftelli64(fpPackage_);     //生成JSON     Json::Value root;     Json::Value array;     Json::FastWriter writer;     Json::Value fileInfo;       for (std::deque<FILEINFO>::iterator it = fileInfoList.begin();         it != fileInfoList.end(); it++) {         fileInfo["Filename"] = it->filename;         fileInfo["FileSize"] = it->fileSize;         fileInfo["Offset"] = it->offsetInPackFile;         array.append(fileInfo);     }     root["array"] = array;           std::string s = writer.write(root);       //写入文件信息     fwrite(s.c_str(),1,s.size(), fpPackage_);       //跳转到文件头 写入JOSN偏移     _fseeki64(fpPackage_, 0, SEEK_SET);     fwrite(&currentOffset,1,sizeof(currentOffset), fpPackage_);     fflush(fpPackage_);     return true; }   bool Package::PackFile() {     bool bRet = false;     //预留 打包文件的信息的偏移位置     __int64 jsonOffset = 0;     fwrite(&jsonOffset, 1, sizeof(jsonOffset), fpPackage_);     for (std::deque<std::string>::iterator it = fileList.begin();         it != fileList.end(); it++) {         std::string fileName = *it;         PackageOneFile(fileName.c_str());     }     fileList.clear();     WriteFileInfoToPackFile();       return bRet; }

打包文件格式如下

文件信息格式类似

代码运行结果

具体代码见

http://www.oschina.net/code/snippet_614253_56938