/
barcode.go
executable file
·57 lines (51 loc) · 1.17 KB
/
barcode.go
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package gbarcode
import (
"github.com/boombuler/barcode"
"github.com/boombuler/barcode/qr"
"github.com/davidforest123/goutil/basic/gerrors"
"github.com/tuotoo/qrcode"
"image/gif"
"image/jpeg"
"image/png"
"io"
"strings"
)
// suffix: "gif","jpg","jpeg","png"
func EncodeQrCode(content string, size int, suffix string, w io.Writer) error {
if len(content) == 0 {
return gerrors.Errorf("Empty input content")
}
if size <= 0 || size > 10000 {
size = 200
}
// Create the barcode
qrCode, err := qr.Encode(content, qr.M, qr.Auto)
if err != nil {
return err
}
// Scale the barcode to 200x200 pixels
qrCode, err = barcode.Scale(qrCode, size, size)
if err != nil {
return err
}
// encode the barcode as png
suffix = strings.ToLower(suffix)
switch suffix {
case "png":
return png.Encode(w, qrCode)
case "jpg":
return jpeg.Encode(w, qrCode, nil)
case "jpeg":
return jpeg.Encode(w, qrCode, nil)
case "gif":
return gif.Encode(w, qrCode, nil)
}
return gerrors.Errorf("Unsupported output image suffix %s", suffix)
}
func DecodeQrCode(r io.Reader) (string, error) {
matrix, err := qrcode.Decode(r)
if err != nil {
return "", err
}
return matrix.Content, nil
}