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msg_ver.go
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msg_ver.go
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// Copyright 2024 tobyzxj
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package secoapcore
import (
"errors"
"strconv"
)
// Ver represents the message ver.
// It's only part of Secoap UDP messages.
type Ver int8
const (
// Version0
Version0 Ver = 0
// Version1
Version1 Ver = 1
// Version2
Version2 Ver = 2
)
var verToString = map[Ver]string{
Version0: "Ver0",
Version1: "Ver1",
Version2: "Ver2",
}
func (c Ver) String() string {
str, ok := verToString[c]
if !ok {
return "Ver(" + strconv.FormatInt(int64(c), 10) + ")"
}
return str
}
func ToVer(v string) (Ver, error) {
for key, val := range verToString {
if val == v {
return key, nil
}
}
return 0, errors.New("not found")
}
// ValidateVer validates the ver for UDP. (0 <= typ <= 3)
func ValidateVer(typ Ver) bool {
return typ >= 0 && typ <= (1<<2-1)
}
// GetVersion gets the version from the payload.
func GetVersion(payload []byte) (ver Ver, err error) {
if len(payload) == 0 {
return 0, errors.New("empty payload")
}
ver = Ver(payload[0] >> 6)
return ver, nil
}