C中如何创建.tar.bz2文件

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最新推荐文章于 2024-02-16 23:04:27 发布

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本文提供了一个使用C++结合libtar和libbz2库来创建并压缩目录为tar.bz2文件的示例代码。该代码首先将指定目录打包成tar文件，然后用bzip2对其进行压缩。

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问题

I need to create a tarball of a directory and then compress it with bz2 in C++. Is there any decent tutorial on using libtar and libbz2?

解决方法

Okay, I worked up a quick example for you. No error checking and various arbitrary decisions, but it works. libbzip2 has fairly good web documentation. libtar, not so much, but there are manpages in the package, an example, and a documented header file. The below can be built with g++ C++TarBz2.cpp -ltar -lbz2 -o C++TarBz2.exe:

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <libtar.h>
#include <bzlib.h>
#include <unistd.h>

int main()
{
    TAR *pTar;
    char tarFilename[] = "file.tar";
    char srcDir[] = "dirToZip/";
    char extractTo[] = ".";

    tar_open(&pTar, tarFilename, NULL, O_WRONLY | O_CREAT, 0644, TAR_GNU);
    tar_append_tree(pTar, srcDir, extractTo);

    close(tar_fd(pTar));

    int tarFD = open(tarFilename, O_RDONLY);

    char tbz2Filename[] =  "file.tar.bz2";
    FILE *tbz2File = fopen(tbz2Filename, "wb");
    int bzError;
    const int BLOCK_MULTIPLIER = 7;
    BZFILE *pBz = BZ2_bzWriteOpen(&bzError, tbz2File, BLOCK_MULTIPLIER, 0, 0);

    const int BUF_SIZE = 10000;
    char* buf = new char[BUF_SIZE];
    ssize_t bytesRead;
    while((bytesRead = read(tarFD, buf, BUF_SIZE)) > 0)
    {
    BZ2_bzWrite(&bzError, pBz, buf, bytesRead);
    }
    BZ2_bzWriteClose(&bzError, pBz, 0, NULL, NULL);
    close(tarFD);
    remove(tarFilename);

    delete[] buf;

}