// Copyright 2020 Justine Alexandra Roberts Tunney
// 
// 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
// 
//     http://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 sip

import (
	"strconv"
	"time"
)

func duration(ms *int) time.Duration {
	return time.Duration(*ms) * time.Millisecond
}

func or5060(port uint16) uint16 {
	if port == 0 {
		return 5060
	}
	return port
}

func portstr(port uint16) string {
	return strconv.FormatInt(int64(port), 10)
}

func unhex(b byte) byte {
	switch {
	case '0' <= b && b <= '9':
		return b - '0'
	case 'a' <= b && b <= 'f':
		return b - 'a' + 10
	case 'A' <= b && b <= 'F':
		return b - 'A' + 10
	}
	return 0
}