cli-tarHow do I use tar gzip in a multithreaded environment?

Tar Gzip can be used in a multithreaded environment to compress and decompress files in parallel. It uses a combination of tar and gzip to speed up the process. The following example code shows how to use tar gzip in a multithreaded environment:

#include <stdio.h>
#include <pthread.h>
#include <zlib.h>
#include <tar.h>

int main(int argc, char** argv)
{
    // Create a thread for each file to be compressed
    pthread_t threads[argc-1];
    for (int i = 1; i < argc; i++) {
        pthread_create(&threads[i-1], NULL, tar_gzip, argv[i]);
    }

    // Wait for all threads to finish
    for (int i = 0; i < argc-1; i++) {
        pthread_join(threads[i], NULL);
    }

    return 0;
}

void* tar_gzip(void* filename)
{
    // Open the file
    FILE* fp = fopen((char*)filename, "rb");

    // Create a buffer to store the compressed data
    char buffer[BUFSIZ];

    // Setup the tar header
    struct tar_header header;
    strncpy(header.name, (char*)filename, 100);
    header.typeflag = REGTYPE;
    header.size = get_file_size(fp);

    // Compress the data
    gzFile gzf = gzopen(buffer, "wb");
    gzwrite(gzf, fp, header.size);
    gzclose(gzf);

    // Write the tar header and compressed data to the file
    fwrite(&header, sizeof(struct tar_header), 1, fp);
    fwrite(buffer, sizeof(char), get_compressed_size(buffer), fp);

    // Close the file
    fclose(fp);
}

The code above demonstrates how to use tar gzip in a multithreaded environment:

1. Create a thread for each file to be compressed.
2. Wait for all threads to finish.
3. Open the file.
4. Create a buffer to store the compressed data.
5. Setup the tar header.
6. Compress the data.
7. Write the tar header and compressed data to the file.
8. Close the file.

Helpful links

• zlib
• tar.h

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