encode.go

package imgo

import (
	"bytes"
	"encoding/base64"
	"image"
	"image/png"
	"io/ioutil"
)

//Img2Base64 produce a base64 string from a image file.
func Img2Base64(filepath string) (encodeString string, err error) {
	data, err := ioutil.ReadFile(filepath)
	if err != nil {
		return
	}
	encodeString = base64.StdEncoding.EncodeToString(data)
	return
}

//Base64ToImg create a image file named dstFile from base64 encodeString.
func Base64ToImg(encodeString string, dstFile string) error {
	data, err := base64.StdEncoding.DecodeString(encodeString)
	if err != nil {
		return err
	}
	err2 := ioutil.WriteFile(dstFile, data, 0666)
	if err2 != nil {
		return err2
	}
	return nil
}

//Img2base64ByGoImage produce a base64 string from Image interface.
func Img2Base64ByGoImage(img image.Image) (encodeString string, err error) {
	var w bytes.Buffer
	encodeErr := png.Encode(&w, img)
	if encodeErr != nil {
		return "", encodeErr
	}

	encodeString = base64.StdEncoding.EncodeToString(w.Bytes())
	return
}