golang: gzip and gunzip

gzip.go

package main

import (
	"bytes"
	"compress/gzip"
	"fmt"
	"io"
	"log"
)

func gUnzipData(data []byte) (resData []byte, err error) {
	b := bytes.NewBuffer(data)

	var r io.Reader
	r, err = gzip.NewReader(b)
	if err != nil {
		return
	}

	var resB bytes.Buffer
	_, err = resB.ReadFrom(r)
	if err != nil {
		return
	}

	resData = resB.Bytes()

	return
}

func gZipData(data []byte) (compressedData []byte, err error) {
	var b bytes.Buffer
	gz := gzip.NewWriter(&b)

	_, err = gz.Write(data)
	if err != nil {
		return
	}

	if err = gz.Flush(); err != nil {
		return
	}

	if err = gz.Close(); err != nil {
		return
	}

	compressedData = b.Bytes()

	return
}

func main() {
	// define original data
	data := []byte(`MyzYrIyMLyNqwDSTBqSwM2D6KD9sA8S/d3Vyy6ldE+oRVdWyqNQrjTxQ6uG3XBOS0P4GGaIMJEPQ/gYZogwkQ+A0/gSU03fRJvdhIGQ1AMARVdWyqNQrjRFV1bKo1CuNEVXVsqjUK40RVdWyqNQrjRFV1bKo1CuNPmQF870PPsnSNeKI1U/MrOA0/gSU03fRb2A3OsnORNIruhCUYTIrOMTNU7JuGb5RSYJxa6PiMHdiRmFtXLNoY+GVmTD7aOV/K1yo4y0dR7Q=`)
	fmt.Println("original data:", data)
	fmt.Println("original data len:", len(data))

	// compress data
	compressedData, compressedDataErr := gZipData(data)
	if compressedDataErr != nil {
		log.Fatal(compressedDataErr)
	}

	fmt.Println("compressed data:", compressedData)
	fmt.Println("compressed data len:", len(compressedData))

	// uncompress data
	uncompressedData, uncompressedDataErr := gUnzipData(compressedData)
	if uncompressedDataErr != nil {
		log.Fatal(uncompressedDataErr)
	}

	fmt.Println("uncompressed data:", uncompressedData)
	fmt.Println("uncompressed data len:", len(uncompressedData))
}