How to use the compress/flate package to compress and decompress streams of data in Go?

To use the compress/flate package in Go to compress and decompress streams of data, you would typically follow these steps:

Import the required packages:

import (
	"compress/flate"
	"io"
	"os"
)

For compression, create a Writer object with the desired compression level and output destination:

outputFile, err := os.Create("compressed.dat")
if err != nil {
    panic(err)
}
defer outputFile.Close()

compressor, err := flate.NewWriter(outputFile, flate.BestCompression)
if err != nil {
    panic(err)
}
defer compressor.Close()

Write your data to the compressor:

data := []byte("Data to be compressed")
_, err = compressor.Write(data)
if err != nil {
    panic(err)
}

Close the compressor to ensure all data is written and compressed correctly:

err = compressor.Close()
if err != nil {
    panic(err)
}

Now you have a compressed stream of data in the compressed.dat file.

For decompression, create a Reader from your compressed stream file:

compressedFile, err := os.Open("compressed.dat")
if err != nil {
    panic(err)
}
defer compressedFile.Close()

decompressor := flate.NewReader(compressedFile)
defer decompressor.Close()

Create a byte slice to read the decompressed data into:

decompressedData := make([]byte, 1024)

n, err := decompressor.Read(decompressedData)
if err != nil && err != io.EOF {
    panic(err)
}

Use the n variable to determine the actual number of bytes read, which is the decompressed data length. You can use only decompressedData[:n] to access the decompressed data:

fmt.Println(string(decompressedData[:n]))

That's it! You've successfully compressed and decompressed streams of data using the compress/flate package in Go.