c++ 解析zip文件，实现对流式文件pptx内容的修改

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 currentPath= std::string(folderPath) + "/" + file;
			//filePaths.push_back(currentPath);
			getFiles(currentPath.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
			//filePaths.push_back(entryPath);
			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
}