package main

import (
	"encoding/base32"
	"encoding/base64"
	"encoding/hex"
	"fmt"
	"log"
)

func base64Demo() {
	msg := "Hello, 世界"
	encoded := base64.StdEncoding.EncodeToString([]byte(msg))
	fmt.Println(encoded)
	decoded, err := base64.StdEncoding.DecodeString(encoded)
	if err != nil {
		fmt.Println("decode error:", err)
		return
	}
	fmt.Println(string(decoded))
}

func base32Demo() {
	str := "JBSWY3DPFQQHO33SNRSCC==="
	dst := make([]byte, base32.StdEncoding.DecodedLen(len(str)))
	n, err := base32.StdEncoding.Decode(dst, []byte(str))
	if err != nil {
		fmt.Println("decode error:", err)
		return
	}
	dst = dst[:n]
	fmt.Printf("%q\n", dst)
}

func hexDemo() {
	const s = "48656c6c6f20476f7068657221"
	decoded, err := hex.DecodeString(s)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%s\n", decoded)

}
func main() {
	base64Demo()
	base32Demo()
	hexDemo()
}