How to import and use the compress/gzip package in Go?

To import and use the compress/gzip package in Go, follow these steps:

Step 1: Import the package In your Go file, import the compress/gzip package using the import statement:

import (
    "compress/gzip"
)

Step 2: Open the GZIP file Use the os package to open the GZIP file you want to read or write. For example, to open a GZIP file named "data.gz" for reading:

file, err := os.Open("data.gz")
if err != nil {
    log.Fatal(err)
}
defer file.Close()

Step 3: Create a GZIP reader/writer Create a GZIP reader or writer using the gzip.NewReader or gzip.NewWriter function, respectively. For reading:

gzipReader, err := gzip.NewReader(file)
if err != nil {
    log.Fatal(err)
}
defer gzipReader.Close()

For writing:

gzipWriter := gzip.NewWriter(file)
defer gzipWriter.Close()

Step 4: Read from or write to the GZIP file Now, you can read from or write to the GZIP file using the gzipReader or gzipWriter created in the previous step. For reading, you can use the Read or ReadString methods, depending on the type of data you are reading:

data := make([]byte, 1024)
for {
    n, err := gzipReader.Read(data)
    if err != nil && err != io.EOF {
        log.Fatal(err)
    }
    if n == 0 {
        break
    }
    // Process the read data as per your requirement
}

For writing, you can use the Write or WriteString methods to write data to the GZIP file:

data := []byte("Hello, World!")
_, err := gzipWriter.Write(data)
if err != nil {
    log.Fatal(err)
}
// Write more data if required

That's it! You have successfully imported and used the compress/gzip package in Go.