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66 lines
1.7 KiB
66 lines
1.7 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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package sip
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import (
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"bytes"
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)
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// appendSanitized appends stripping all characters that don't match the predicate.
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func appendSanitized(b *bytes.Buffer, s []byte, p func(byte) bool) {
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for i := 0; i < len(s); i++ {
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if p(s[i]) {
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b.WriteByte(s[i])
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}
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}
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}
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// quote formats an address parameter value or display name.
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//
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// Quotation marks are only added if necessary. This implementation will
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// truncate on input error.
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func appendQuoted(b *bytes.Buffer, s []byte) {
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for i := 0; i < len(s); i++ {
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if !tokenc(s[i]) && s[i] != ' ' {
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appendQuoteQuoted(b, s)
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return
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}
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}
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b.Write(s)
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}
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// quoteQuoted formats an address parameter value or display name with quotes.
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//
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// This implementation will truncate on input error.
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func appendQuoteQuoted(b *bytes.Buffer, s []byte) {
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b.WriteByte('"')
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for i := 0; i < len(s); i++ {
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if qdtextc(s[i]) {
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if s[i] == '\r' {
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if i+2 >= len(s) || s[i+1] != '\n' ||
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!(s[i+2] == ' ' || s[i+2] == '\t') {
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break
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}
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}
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} else {
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if !qdtextesc(s[i]) {
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break
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}
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b.WriteByte('\\')
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}
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b.WriteByte(s[i])
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}
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b.WriteByte('"')
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}
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