c++实现解析zip文件的示例代码
作者:spirits_of_snail
这篇文章主要为大家详细介绍了如何利用c++实现解析zip文件,并对流式文件pptx内容的修改,文中的示例代码讲解详细,有需要的小伙伴可以参考一下
libzip
官网地址:
示例代码
#include <iostream> #include <cstdlib> #include <cstring> #include <ctime> #include <zip.h> //解析原始zip内容,保存为新的zip文件 int ziptest(const char* inputPath, const char* outputPath) { int error = 0; zip_t *zip_file = zip_open(inputPath, ZIP_CHECKCONS, &error); if (zip_file == NULL) { printf("Failed to open zip file: %s\n", zip_strerror(zip_file)); return 1; } // 获取条目数量 int numEntries = zip_get_num_entries(zip_file, 0); if (numEntries < 0) { std::cerr << "Failed to get number of entries." << std::endl; zip_close(zip_file); return 1; } //保存为目标zip文件 zip_t* archive = zip_open(outputPath, ZIP_CREATE | ZIP_TRUNCATE, nullptr); if (archive == nullptr) { std::cout << "无法创建 ZIP 存档." << std::endl; return 1; } unsigned char* itemData = NULL; for (size_t i = 0; i < numEntries; i++) { zip_stat_t entryStat; if (zip_stat_index(zip_file, i, 0, &entryStat) != 0) { std::cerr << "Failed to get information for entry " << i << std::endl; continue; } //printf("index: [%llu]\t", entryStat.index); //printf("Name: [%s]\t", entryStat.name); //printf("valid: [%llu]\t", entryStat.valid); //printf("Size: [%llu]\t", entryStat.size); //printf("comp_size: [%llu]\t", entryStat.comp_size); //printf("comp_method: [%zu]", entryStat.comp_method); //printf("\t flags: [%lu]\n", entryStat.flags); if (entryStat.valid & ZIP_STAT_NAME) { // 打开条目文件 zip_file_t *entryFile = zip_fopen_index(zip_file, i, 0); if (entryFile == NULL) { std::cerr << "Failed to open entry file: " << entryStat.name << std::endl; //goto END; continue; } size_t bufferSize = entryStat.size; // 读取内存空间 itemData = (unsigned char *)malloc(bufferSize); if (zip_fread(entryFile, itemData, bufferSize) < 0) { std::cerr << "Failed to read entry file: " << entryStat.name << std::endl; zip_fclose(entryFile); if (itemData != NULL) { free(itemData); itemData = NULL; } continue; } // 创建源对象,并将其添加到 ZIP 存档中 //zip_source_buffer内部会自动释放itemData内存 zip_source* source = zip_source_buffer(archive, itemData, bufferSize, 0); if (source == NULL) { std::cout << "无法写入 ZIP 文件." << std::endl; if (itemData != NULL) { free(itemData); itemData = NULL; } zip_fclose(entryFile); continue; } // use zip_file_replace() to modify source zip file /**** if (zip_file_replace(zip_file, i, source, 0) < 0) { std::cout << "replace failed." << std::endl; zip_source_free(source); zip_fclose(entryFile); break; } ****/ if (zip_file_add(archive, entryStat.name, source, ZIP_FL_OVERWRITE) < 0) { std::cout << "无法写入 ZIP 文件." << std::endl; zip_source_free(source); zip_fclose(entryFile); if (itemData != NULL) { free(itemData); itemData = NULL; } continue; } zip_fclose(entryFile); } } // 关闭zip文件 zip_close(zip_file); zip_close(archive); return 0; }
#include <zip.h> #include <memory.h> #include <stdio.h> #include <math.h> #include <fstream> #ifdef _WIN32 #include <io.h> /* _access */ #include<direct.h> /* _mkdir */ #include<windows.h> #else #include<unistd.h> /* access */ #include<sys/stat.h> /*mkdir*/ #include <sys/types.h> #endif //创建多级文件夹 void createFolders(std::string rootPath); //获取多级文件夹下所以文件列表 void getDirAllFilePath(const char* folderPath, std::vector<std::string>& filePaths); //解压zip,保存到磁盘指定目录 int unzipFunc(const char* destzip, const std::string output) { // 打开ZIP文件 zip* archive = zip_open(destzip , 0, NULL); if (!archive) { std::cerr << "Failed to open archive" << std::endl; return -1; } // 获取ZIP文件中的文件数量 int numFiles = zip_get_num_files(archive); //std::cout << "Archive contains " << numFiles << " files" << std::endl; // 遍历ZIP文件中的所有文件 for (int i = 0; i < numFiles; ++i) { FILE *fp = NULL; // 获取文件的名称和大小 zip_stat_t fileStat; zip_stat_init(&fileStat); if (zip_stat_index(archive, i, 0, &fileStat) != 0) { std::cerr << "Failed to get file info for index " << i << std::endl; continue; } int len = strlen(fileStat.name); std::cout << "File " << i << ": " << fileStat.name << " (" << fileStat.size << " bytes)" << std::endl; // 解压文件到磁盘指定位置, 执行解压之前, 需创建对应的文件夹,否则,解压失败 std::string dest_name = output + std::string(fileStat.name); createFolders(dest_name); zip_file_t* zf = zip_fopen_index(archive, i, 0); if (!zf) { continue; } fp = fopen(dest_name.c_str(), "wb"); if (fp == NULL) { continue; } long long sum = 0; unsigned char* buffer = (unsigned char*)malloc(fileStat.size); memset(buffer, 0, fileStat.size); if (zip_fread(zf, buffer, fileStat.size) < 0) { continue; } fwrite(buffer, 1, fileStat.size, fp); free(buffer); buffer = NULL; zip_fclose(zf); fclose(fp); } // 关闭ZIP文件 if (zip_close(archive) != 0) { std::cerr << "Failed to close archive" << std::endl; return -1; } return 0; } //将文件夹压缩为指定的zip int zipFunc(const char* inputDirPath, const char* destzip) { // 打开ZIP文件 int iErr = 0; zip* archive = zip_open(destzip, ZIP_CREATE | ZIP_TRUNCATE, &iErr); if (!archive) { std::cerr << "Failed to open archive" << std::endl; return -1; } std::vector<std::string> files; //获取的是绝对路径 getDirAllFilePath(inputDirPath, files); std::string rootPath(inputDirPath); for (size_t i = 0; i < files.size(); i++) { std::string::size_type rootSize = rootPath.length(); //获取指定目录下的相对路径,作为zip包的条目名称 std::string itemName = files[i].substr(rootSize + 1); std::cout << "entry: " << files[i].c_str() << std::endl; //通过文件创建zip_source源对象 zip_source_t* source = zip_source_file(archive, files[i].c_str(), 0, -1); if (!source) { printf(" open zip_source file failed\n"); zip_close(archive); return 1; } //add file if (zip_file_add(archive, itemName .c_str(), source, ZIP_FL_OVERWRITE) < 0) { zip_source_free(source); zip_close(archive); return 2; } } // 关闭ZIP文件 if (zip_close(archive) != 0) { std::cerr << "Failed to close archive" << std::endl; return -1; } return 0; } //创建文件夹 int create_dir(const char *dir) { #ifdef WIN32 if ((_access(dir, 0)) != 0) //如果文件夹不存在 { int flag = _mkdir(dir); if (flag != 0) { printf("Fail to create directory %s.", dir); //"Fail to create directory." << std::endl; return OOXML_PARAMETER_ERR; } } #else if ((access(dir, 0)) != 0) //如果文件夹不存在 { int flag = mkdir(dir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); if (flag != 0) { printf("Fail to create directory %s.", dir); return OOXML_PARAMETER_ERR; } } #endif return 0; } //递归创建文件夹 void mkdirRecursively(const std::string root, const std::string folderPath) { size_t pos = folderPath.find('/'); std::string subPath; if (pos != std::string::npos) { subPath = folderPath.substr(0, pos); } else { subPath = folderPath; } if (root == "") { if (!subPath.empty()) { if(create_dir(subPath.c_str()) != 0) return ; std::string remainingPath = folderPath.substr(pos + 1); if (pos != std::string::npos) { return mkdirRecursively(subPath, remainingPath); } else { return ; } } } else { std::string subdir = root; if (subdir.back() != '/') { subdir += "/"; } if (!subPath.empty()){ std::string current = subdir + subPath; if (create_dir(current.c_str()) != 0) return ; std::string remainingPath = folderPath.substr(pos + 1); if (pos != std::string::npos) { return mkdirRecursively(current, remainingPath); } else { return ; } } } return ; } //创建多级文件夹 //如果是文件,则创建文件所占目录文件夹 void createFolders(std::string rootPath) { std::string::size_type idx = rootPath.find_last_of('/'); std::string filename = rootPath.substr(idx + 1); std::string::size_type pos = filename.find('.'); if (!filename.empty() && (pos != std::string::npos)) { std::string subdirname = rootPath.substr(0, idx + 1); //std::cout << subdirname << std::endl; mkdirRecursively("", subdirname); } else{ //std::cout << rootPath << std::endl; mkdirRecursively("", rootPath); } } void getDirAllFilePath(const char* folderPath, std::vector<std::string>& filePaths) { #ifdef WIN32 HANDLE hFind; WIN32_FIND_DATA findData; LARGE_INTEGER size; char dirNew[128] = { 0x0 }; // 向目录加通配符,用于搜索第一个文件 strcpy(dirNew, folderPath); strcat(dirNew, "\\*.*"); hFind = FindFirstFile(dirNew, &findData); if (hFind == INVALID_HANDLE_VALUE) { std::cerr << "无法打开目录:" << folderPath << std::endl; return; } do { // 是否是文件夹,并且名称不为"."或".." //std::cout << findData.dwFileAttributes << "\n"; if (findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY && strcmp(findData.cFileName, ".") != 0 && strcmp(findData.cFileName, "..") != 0 ) { // 将dirNew设置为搜索到的目录,并进行下一轮搜索 std::string file(findData.cFileName); std::string newPath = std::string(folderPath) + "/" + file; getFiles(newPath.c_str(), filePaths); } else if (strcmp(findData.cFileName, ".") == 0 || strcmp(findData.cFileName, "..") == 0) { continue; } else { std::string file(findData.cFileName); std::string fullPath = std::string(folderPath) + "/" + file; filePaths.push_back(fullPath); } } while (FindNextFile(hFind, &findData)); FindClose(hFind); #else DIR* dir = opendir(folderPath); if (dir == nullptr) { std::cerr << "无法打开目录:" << folderPath << std::endl; return; } struct dirent* entry; while ((entry = readdir(dir)) != nullptr) { std::string entryName(entry->d_name); if (entryName == "." || entryName == "..") { continue; } std::string entryPath(folderPath); if (entryPath.back() != '/') { entryPath += "/"; } entryPath +=entryName; struct stat entryStat; if (stat(entryPath.c_str(), &entryStat) == -1) { std::cerr << "无法获取文件属性:" << entryPath << std::endl; continue; } if (S_ISDIR(entryStat.st_mode)) { // 如果是子目录,则递归调用该函数获取子文件夹中的文件路径 getFiles(entryPath.c_str(), filePaths); } else if (S_ISREG(entryStat.st_mode)) { // 如果是文件,则添加到路径列表中 filePaths.push_back(entryPath); } } closedir(dir); #endif }
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