introduce protocol/version.go and remove big endian functions

protocol/protocol_suite_test.go

@@ -0,0 +1,13 @@
+package protocol_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestProtocol(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Protocol Suite")
+}

protocol/version.go

@@ -0,0 +1,15 @@
+package protocol
+
+// VersionNumber is a version number as int
+type VersionNumber int
+
+// VersionNumberToTag maps version numbers ('32') to tags ('Q032')
+func VersionNumberToTag(vn VersionNumber) uint32 {
+	v := uint32(vn)
+	return 'Q' + ((v/100%10)+'0')<<8 + ((v/10%10)+'0')<<16 + ((v%10)+'0')<<24
+}
+
+// VersionTagToNumber is built from VersionNumberToTag in init()
+func VersionTagToNumber(v uint32) VersionNumber {
+	return VersionNumber(((v>>8)&0xff-'0')*100 + ((v>>16)&0xff-'0')*10 + ((v>>24)&0xff - '0'))
+}

protocol/version_test.go

@@ -0,0 +1,18 @@
+package protocol_test
+
+import (
+	"github.com/lucas-clemente/quic-go/protocol"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Version", func() {
+	It("converts tags to numbers", func() {
+		Expect(protocol.VersionTagToNumber('Q' + '1'<<8 + '2'<<16 + '3'<<24)).To(Equal(protocol.VersionNumber(123)))
+	})
+
+	It("converts number to tag", func() {
+		Expect(protocol.VersionNumberToTag(protocol.VersionNumber(123))).To(Equal(uint32('Q' + '1'<<8 + '2'<<16 + '3'<<24)))
+	})
+})