Ready for testing.

go.mod

@@ -0,0 +1,3 @@
+module git.hoiting.org/micha/triplex
+
+go 1.25.0

serial/serial.go

@@ -1,24 +1,37 @@
+package serial
+
+import (
+	"errors"
+	"fmt"
+	"log"
+)
+
 const (
+	MaxIndex = block
+
 	letters = 26
 	numbers = 900                                   // 100–999
 	block   = letters * letters * letters * numbers // 26^3 * 900
 )
 
 func Encode(code string) (uint32, error) {
+	log.Printf("code: %v", code)
 	// Verwacht formaat: L1L2-NNN-L3-C  => lengte 10, posities: 0,1,3,4,5,7,9
 	if len(code) != 10 || code[2] != '-' || code[6] != '-' || code[8] != '-' {
 		return 0, errors.New("invalid format, expected LL-NNN-L-C")
 	}
 
 	l1, l2, l3 := code[0], code[1], code[7]
+	n1, n2, n3 := code[3], code[4], code[5]
 
 	// letters checken
 	// forbidden alleen op l1,l2
 	// nummer parsen uit code[3:6]
 
-    L1 := int(l1 - 'A')
-    L2 := int(l2 - 'A')
-    L3 := int(l3 - 'A')
+	L1 := uint32(l1 - 'A')
+	L2 := uint32(l2 - 'A')
+	L3 := uint32(l3 - 'A')
+	num := uint32(n1*100 + n2*10 + n3)
 	N := num - 100
 
 	idx := uint32((((L1*letters+L2)*letters + L3) * numbers) + N)
@@ -27,10 +40,12 @@ func Encode(code string) (uint32, error) {
 		return 0, errors.New("invalid checksum")
 	}
 
+	log.Printf("idx: %v", idx)
 	return idx, nil
 }
 
 func Decode(idx uint32) (string, error) {
+	log.Printf("idx: %v", idx)
 	if idx >= block {
 		return "", errors.New("index out of range")
 	}
@@ -50,12 +65,22 @@ func Decode(idx uint32) (string, error) {
 	l2 := byte('A' + L2)
 	l3 := byte('A' + L3)
 
-    if isForbiddenPair(l1, l2) {
+	if IsForbiddenPair(l1, l2) {
 		return "", errors.New("forbidden letter combination")
 	}
 
 	c := checksumLetter(idx)
 
-    return fmt.Sprintf("%c%c-%03d-%c-%c", l1, l2, N+100, l3, c), nil
+	code := fmt.Sprintf("%c%c-%03d-%c-%c", l1, l2, N+100, l3, c)
+
+	log.Printf("code: %v", code)
+	return code, nil
 }
 
+func checksumLetter(idx uint32) byte {
+	return byte('A' + idx%26)
+}
+
+func IsForbiddenPair(l1, l2 byte) bool {
+	return false
+}

serial/serial_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 	"testing/quick"
 
-    "yourmodule/serial"
+	"git.hoiting.org/micha/triplex/serial"
 )
 
 // Property: Decode(Encode(code)) == code  (voor geldige codes)
@@ -125,4 +125,3 @@ func TestDecodedFormatLooksCorrect(t *testing.T) {
 		t.Fatalf("Decoded format property failed: %v", err)
 	}
 }
-