functionを移動

Author: sat0ken

utils.go

@@ -1,5 +1,11 @@
 package main
 
+import (
+	"encoding/binary"
+	"fmt"
+	"strings"
+)
+
 func sumByteArr(packet []byte) (sum uint) {
 	for i, _ := range packet {
 		if i%2 == 0 {
@@ -17,3 +23,31 @@ func calcChecksum(packet []byte) []byte {
 	// 論理否定を取った値をbyteにして返す
 	return uint16ToByte(uint16(sum ^ 0xffff))
 }
+
+func printMacAddr(macddr [6]uint8) string {
+	var str string
+	for _, v := range macddr {
+		str += fmt.Sprintf("%x:", v)
+	}
+	return strings.TrimRight(str, ":")
+}
+
+func byteToUint16(b []byte) uint16 {
+	return binary.BigEndian.Uint16(b)
+}
+
+func byteToUint32(b []byte) uint32 {
+	return binary.BigEndian.Uint32(b)
+}
+
+func uint16ToByte(i uint16) []byte {
+	b := make([]byte, 2)
+	binary.BigEndian.PutUint16(b, i)
+	return b
+}
+
+func uint32ToByte(i uint32) []byte {
+	b := make([]byte, 4)
+	binary.BigEndian.PutUint32(b, i)
+	return b
+}