gzip.go

package main

import (
	"bytes"
	"compress/gzip"
	"io/ioutil"
)

type File struct {
	path string
}

func (f *File) Read() ([]byte, error) {
	b, err := ioutil.ReadFile(f.path)
	if err != nil {
		return nil, err
	}

	buf := bytes.NewBuffer(b)
	g, err := gzip.NewReader(buf)
	if err != nil {
		return nil, err
	}
	defer g.Close()

	body := make([]byte, len(b))
	_, err = g.Read(body)
	if err != nil {
		return nil, err
	}
	return body, nil
}

func (f *File) Write(data []byte) error {
	var b bytes.Buffer
	w := gzip.NewWriter(&b)
	_, err := w.Write(data)
	if err != nil {
		return err
	}

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

	return ioutil.WriteFile(f.path, b.Bytes(), 0666)
}

func Open(path string) *File {
	return &File{path}
}

func main() {
	f := Open("hola.txt.gz")
	f.Write([]byte("meh"))
	//str, _ := f.Read()
	//println(string(str))
}