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-rw-r--r--barcode/barcode.go35
1 files changed, 35 insertions, 0 deletions
diff --git a/barcode/barcode.go b/barcode/barcode.go
new file mode 100644
index 0000000..f400002
--- /dev/null
+++ b/barcode/barcode.go
@@ -0,0 +1,35 @@
+package barcode
+
+import (
+ "strconv"
+ "strings"
+
+ "github.com/neonxp/checksum"
+)
+
+// Check barcode
+func Check(number string) error {
+ sum := 0
+ numbers := strings.Split(number, "")
+ l := len(numbers)
+ for i := l; i > 0; i-- {
+ ch := numbers[i-1]
+ num, err := strconv.Atoi(string(ch))
+ if err != nil {
+ return checksum.ErrInvalidNumber
+ }
+ if (l-i)%2 != 0 {
+ sum += num * 3
+ } else {
+ sum += num
+ }
+ }
+ if sum%10 != 0 {
+ return checksum.ErrInvalidChecksum
+ }
+ return nil
+}
+
+func Generate(number string) (string, error) {
+ return "", checksum.ErrNotImplemented
+}