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param.go
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param.go
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// 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.
// Addr / Via Parameter Library
package sip
import (
"bytes"
"strings"
)
// Param is a linked list of ;key="values" for Addr/Via parameters.
type Param struct {
Name string
Value string
Next *Param
}
// Get returns an entry in O(n) time.
func (p *Param) Get(name string) *Param {
if p == nil {
return nil
}
if strings.EqualFold(p.Name, name) {
return p
}
return p.Next.Get(name)
}
// Append serializes parameters in insertion order.
func (p *Param) Append(b *bytes.Buffer) {
if p == nil {
return
}
p.Next.Append(b)
b.WriteByte(';')
appendSanitized(b, []byte(p.Name), tokenc)
if p.Value != "" {
b.WriteByte('=')
appendQuoted(b, []byte(p.Value))
}
}