C++ zip庫(kù)在文件同步工具中的實(shí)現(xiàn)

在C++中，可以使用第三方庫(kù)如zlib或minizip來實(shí)現(xiàn)文件壓縮和解壓縮功能。以下是一個(gè)簡(jiǎn)單的示例代碼，展示了如何使用minizip庫(kù)來實(shí)現(xiàn)文件的壓縮和解壓縮：

#include <iostream>
#include "minizip/zip.h"
#include "minizip/unzip.h"

void compressFile(const std::string& filePath) {
    zipFile zf = zipOpen((filePath + ".zip").c_str(), APPEND_STATUS_CREATE);
    if (zf == NULL) {
        std::cerr << "Error opening zip file" << std::endl;
        return;
    }

    zip_fileinfo zi = {};
    zipOpenNewFileInZip(zf, (filePath + ".txt").c_str(), &zi, NULL, 0, NULL, 0, NULL, Z_DEFLATED, Z_DEFAULT_COMPRESSION);

    FILE* file = fopen(filePath.c_str(), "rb");
    if (file == NULL) {
        std::cerr << "Error opening file" << std::endl;
        zipClose(zf, NULL);
        return;
    }

    char buf[1024];
    int len;
    while ((len = fread(buf, 1, sizeof(buf), file)) > 0) {
        zipWriteInFileInZip(zf, buf, len);
    }

    fclose(file);
    zipCloseFileInZip(zf);
    zipClose(zf, NULL);
    std::cout << "File compressed successfully" << std::endl;
}

void decompressFile(const std::string& zipFilePath) {
    unzFile uf = unzOpen(zipFilePath.c_str());
    if (uf == NULL) {
        std::cerr << "Error opening zip file" << std::endl;
        return;
    }

    unz_file_info fi = {};
    unzGetCurrentFileInfo(uf, &fi, NULL, 0, NULL, 0, NULL, 0);
    unzOpenCurrentFile(uf);

    char buf[1024];
    FILE* file = fopen("output.txt", "wb");
    if (file == NULL) {
        std::cerr << "Error opening file" << std::endl;
        unzCloseCurrentFile(uf);
        unzClose(uf);
        return;
    }

    int len;
    while ((len = unzReadCurrentFile(uf, buf, sizeof(buf))) > 0) {
        fwrite(buf, 1, len, file);
    }

    fclose(file);
    unzCloseCurrentFile(uf);
    unzClose(uf);
    std::cout << "File decompressed successfully" << std::endl;
}

int main() {
    compressFile("test.txt");
    decompressFile("test.txt.zip");
    return 0;
}

在上面的示例中，compressFile()函數(shù)用于壓縮文件，decompressFile()函數(shù)用于解壓縮文件。需要注意的是，示例中使用的是minizip庫(kù)，需要提前下載并編譯該庫(kù)。壓縮和解壓縮文件的過程都是通過minizip庫(kù)提供的接口函數(shù)來實(shí)現(xiàn)的。