How Can I Read the Contents of a Tar File Without Decompression?

Reading Tar File Contents Without Decompression

In order to read the contents of a tar file without extracting it to disk, one must utilize the tar.Reader as an io.Reader for individual files. Here's how it can be implemented:

package main

import (
    "archive/tar"
    "fmt"
    "io"
    "io/ioutil"
    "log"
    "os"
    "bufio"
)

func main() {
    file, err := os.Open("testtar.tar.gz")

    if err != nil {
        fmt.Println("There is a problem with os.Open")
    }

    tr := tar.NewReader(file)

    // Get the next file entry
    h, _ := tr.Next()

    // Read the complete content of the file into a byte slice
    bs, _ := ioutil.ReadAll(tr)

    // Convert the byte slice to a string
    contents := string(bs)

    fmt.Printf("Contents of %s:\n%s", h.Name, contents)
}

Alternatively, if you need line-by-line access to the file contents:

s := bufio.NewScanner(tr)

// Line reading loop
for s.Scan() {
    l := s.Text()

    // Perform operations on the line
}

if err := s.Err(); err != nil {
    // Handle error
}

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