How to read and write data to compressed files (e.g., gzip) in Go?

To read and write data to compressed files in Go, you can use the gzip package from the standard library. Here's an example of how to use it:

Import the required packages:

import (
    "compress/gzip"
    "os"
)

Reading compressed data from a file:

// Open the compressed file for reading
file, err := os.Open("compressedFile.gz")
if err != nil {
    panic(err)
}
defer file.Close()

// Create a gzip reader
gzipReader, err := gzip.NewReader(file)
if err != nil {
    panic(err)
}
defer gzipReader.Close()

// Read the uncompressed data from the gzip reader
buffer := make([]byte, 4096)
for {
    bytesRead, err := gzipReader.Read(buffer)
    if err != nil {
        panic(err)
    }

    // Process the uncompressed data
    if bytesRead == 0 {
        break
    }
}

Writing compressed data to a file:

// Create the output file for writing
outputFile, err := os.Create("outputFile.gz")
if err != nil {
    panic(err)
}
defer outputFile.Close()

// Create a gzip writer
gzipWriter := gzip.NewWriter(outputFile)
defer gzipWriter.Close()

// Write the compressed data to the gzip writer
data := []byte("Some data to compress")
_, err = gzipWriter.Write(data)
if err != nil {
    panic(err)
}

// Flush any remaining compressed data to the output file
err = gzipWriter.Flush()
if err != nil {
    panic(err)
}

Make sure to handle any errors appropriately according to your use case.