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59 lines
1.4 KiB
59 lines
1.4 KiB
// Copyright 2020 Justine Alexandra Roberts Tunney
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Addr / Via Parameter Library
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package sip
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import (
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"bytes"
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"strings"
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)
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// XHeader is a linked list storing an unrecognized SIP headers.
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type XHeader struct {
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Name string // tokenc
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Value []byte // UTF8, never nil
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Next *XHeader
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}
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// Get returns an entry in O(n) time.
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func (h *XHeader) Get(name string) *XHeader {
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if h == nil {
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return nil
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}
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if strings.EqualFold(h.Name, name) {
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return h
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}
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return h.Next.Get(name)
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}
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// String turns XHeader into a string.
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func (h *XHeader) String() string {
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var b bytes.Buffer
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h.Append(&b)
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return b.String()
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}
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// Append serializes headers in insertion order.
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func (h *XHeader) Append(b *bytes.Buffer) {
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if h == nil {
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return
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}
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h.Next.Append(b)
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appendSanitized(b, []byte(h.Name), tokenc)
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b.WriteString(": ")
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b.Write(h.Value)
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b.WriteString("\r\n")
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}
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